renattach-1.2.4/0000777000175000001440000000000010517521266007235 5renattach-1.2.4/README0000644000175000001440000001633510517514505010037 renattach 1.2.4 - Filter that renames/deletes dangerous email attachments Copyright (C) 2003-2006 Jem E. Berkes Web site: http://www.sysdesign.ca/ Program page: http://www.pc-tools.net/unix/renattach/ Email contact: support@pc-tools.net As per the GNU GPL, there is no warranty for this software. The author makes no guarantees as to software performance or effectiveness. renattach is NOT a virus scanner. Filtering is based on MIME headers and detectable filenames; as such, the software tries to handle both correct structures and incorrectly formatted messages. This filter will not catch all dangerous emails, particularly attachments embedded inside attachments. ************************************************************************ WARNING: THIS SOFTWARE HAS BEEN DISCONTINUED. IT IS NO LONGER MAINTAINED. ************************************************************************ The author recommends that you do not depend upon renattach to filter emails for dangerous content. As of 2006, renattach used on its own is not enough to filter potentially harmful emails. Dangerous attachments, or other attacks, may pass through the filter undetected. Please switch from renattach to some other actively developed security system. Jem E. Berkes 2006-03-19 ************************************************************************ renattach is a fast and efficient UNIX stream filter that can rename or delete potentially dangerous e-mail attachments. The filter is invoked as a simple pipe for use in a wide variety of systems. The 'kill' feature (which eliminates entire messages) can also help sites deal with resource strains caused by modern virus floods. renattach is written in pure C and can quickly process mail with little overhead. Unlike a conventional virus scanner, there are no specific virus or worm definitions. Instead, renattach identifies potentially dangerous attachments based on file extension and executable encoded body content. The software is even capable of reading filenames from inside ZIP archives on the fly, without requiring any external software. The self-contained MIME code parses, fully interprets, then rewrites the header of every attached file. During this process it checks the file's extension against a list, and further checks to make sure the filename is not on a banned list. Only after passing through these steps is the MIME header written fresh using a predetermined, known format. The program's operation is simple: a single mail message is read from stdin, filtered, then written to stdout (or piped to an external command). Tested under Linux, FreeBSD, Solaris, Mac OS X, and Cygwin. This software should compile on any UNIX-like system that has standard C libraries. FEATURES -------- * Fast, lightweight, little overhead * Recognizes both MIME and uuencoded attachments * Compliant with RFC2047 and RFC2231, handles encoded filenames * Capable of reading filenames inside ZIP archives, on the fly * Can rename or delete attachments, or kill entire messages * Can detect executables that carry DOS/Windows signature * Supports list of banned filenames (great for handling floods) * Simple pipe/stream operation; can be used within many filtering systems * Can be installed directly as a content_filter for Postfix MTA * Can be installed as a local delivery agent for Sendmail MTA renattach looks for its configuration file (renattach.conf) in the path specified at compile time. Alternatively, you can specify the location of renattach.conf by using the -c command-line options. For example: renattach -c renattach.conf COMMAND USAGE ------------- Note that the filter's default behaviour is to rename dangerous attachments that match the badlist {mode=badlist, action=rename}. If searching inside ZIP archives for filenames (see the search_zip configuration option), the only actions that modify the ZIP files are delete and kill but NOT rename. Therefore the default rename action has no effect on ZIP files; instead, use the --delete or --kill options. Alternatively, append the /d and /k switches to badlist extensions in the .conf file to selectively delete or kill some file types while just renaming the rest. (See man page for more detail on some of these command-line options) Usage: renattach [OPTIONS] -a, --all Filter mode: Match all attachments. -b, --badlist Filter mode: Only match filenames that have extensions listed on the bad-list. This will match only attachments with known dangerous file extensions (default). -c, --config filename Use the specified configuration file. Run renattach with --settings to verify current settings. -d, --delete Filter action: Delete attachment body after renaming headers. -e, --excode Extend exitcodes: 77=filtering occurred. This is in addition to the default codes: 0=success, 75=temporary failure, 255=critical failure -g, --goodlist Filter mode: Match all attachments except those that have extensions listed on the goodlist. -h, --help Show help, explain options. -k, --kill Filter action: Kill (absorb) entire email. -l, --loop Remove Delivered-To headers to prevent malicious mail forwarding loop. -p, --pipe command [args] Instead of writing output to stdout, open pipe to command (with args) and send output there. This program must return with exit code 0. This must be the last option on the command line. -r, --rename Filter action: Rename matching attachments (default). -s, --settings Show current settings/configuration and terminate. -v, --verbose Write verbose output (including settings) to stderr. -V, --version Display software version and terminate. CONF FILE --------- renattach reads its configuration options from renattach.conf, in your $sysconfdir. There are defaults for all options but you will probably want to tweak the configuration for your needs. The example configuration file renattach.conf.ex fully describes all supported configuration directives (in conf/ and copied to $sysconfdir by install). Configuration directives are also described in the man page. # Drop mail carrying executable attachments (DOS/Windows exec signature) delete_exe = no kill_exe = yes # Search for filenames inside ZIP files search_zip = yes # Log filtered mail (delete, kill) to syslog mail facility use_syslog = yes # Delete winmail (MS proprietary) attachments without modifying Subject, # also drop emails containing annoying scanner-generated warning bounces banned_files = /winmail/d, /warn.txt/k, DELETED0.TXT/k subj_banned = # subj_deleted = [deleted attachment] subj_renamed = [renamed attachment] # When these file types are encountered, rename the attachment (assuming # filter is invoked with default action=rename). However, kill mail containing # any BAT, COM, etc. attachments even if they are inside ZIP files. There is # risk of collateral damage. 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PACKAGE='renattach' VERSION='1.2.4' cat >>confdefs.h <<_ACEOF #define PACKAGE "$PACKAGE" _ACEOF cat >>confdefs.h <<_ACEOF #define VERSION "$VERSION" _ACEOF # Some tools Automake needs. ACLOCAL=${ACLOCAL-"${am_missing_run}aclocal-${am__api_version}"} AUTOCONF=${AUTOCONF-"${am_missing_run}autoconf"} AUTOMAKE=${AUTOMAKE-"${am_missing_run}automake-${am__api_version}"} AUTOHEADER=${AUTOHEADER-"${am_missing_run}autoheader"} MAKEINFO=${MAKEINFO-"${am_missing_run}makeinfo"} AMTAR=${AMTAR-"${am_missing_run}tar"} install_sh=${install_sh-"$am_aux_dir/install-sh"} # Installed binaries are usually stripped using `strip' when the user # run `make install-strip'. However `strip' might not be the right # tool to use in cross-compilation environments, therefore Automake # will honor the `STRIP' environment variable to overrule this program. if test "$cross_compiling" != no; then if test -n "$ac_tool_prefix"; then # Extract the first word of "${ac_tool_prefix}strip", so it can be a program name with args. set dummy ${ac_tool_prefix}strip; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_STRIP+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$STRIP"; then ac_cv_prog_STRIP="$STRIP" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_STRIP="${ac_tool_prefix}strip" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi STRIP=$ac_cv_prog_STRIP if test -n "$STRIP"; then echo "$as_me:$LINENO: result: $STRIP" >&5 echo "${ECHO_T}$STRIP" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi fi if test -z "$ac_cv_prog_STRIP"; then ac_ct_STRIP=$STRIP # Extract the first word of "strip", so it can be a program name with args. set dummy strip; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_ac_ct_STRIP+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$ac_ct_STRIP"; then ac_cv_prog_ac_ct_STRIP="$ac_ct_STRIP" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_ac_ct_STRIP="strip" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done test -z "$ac_cv_prog_ac_ct_STRIP" && ac_cv_prog_ac_ct_STRIP=":" fi fi ac_ct_STRIP=$ac_cv_prog_ac_ct_STRIP if test -n "$ac_ct_STRIP"; then echo "$as_me:$LINENO: result: $ac_ct_STRIP" >&5 echo "${ECHO_T}$ac_ct_STRIP" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi STRIP=$ac_ct_STRIP else STRIP="$ac_cv_prog_STRIP" fi fi INSTALL_STRIP_PROGRAM="\${SHELL} \$(install_sh) -c -s" # We need awk for the "check" target. The system "awk" is bad on # some platforms. ac_config_headers="$ac_config_headers config.h" ac_ext=c ac_cpp='$CPP $CPPFLAGS' ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ac_compiler_gnu=$ac_cv_c_compiler_gnu if test -n "$ac_tool_prefix"; then # Extract the first word of "${ac_tool_prefix}gcc", so it can be a program name with args. set dummy ${ac_tool_prefix}gcc; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$CC"; then ac_cv_prog_CC="$CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_CC="${ac_tool_prefix}gcc" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi CC=$ac_cv_prog_CC if test -n "$CC"; then echo "$as_me:$LINENO: result: $CC" >&5 echo "${ECHO_T}$CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi fi if test -z "$ac_cv_prog_CC"; then ac_ct_CC=$CC # Extract the first word of "gcc", so it can be a program name with args. set dummy gcc; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_ac_ct_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$ac_ct_CC"; then ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_ac_ct_CC="gcc" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi ac_ct_CC=$ac_cv_prog_ac_ct_CC if test -n "$ac_ct_CC"; then echo "$as_me:$LINENO: result: $ac_ct_CC" >&5 echo "${ECHO_T}$ac_ct_CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi CC=$ac_ct_CC else CC="$ac_cv_prog_CC" fi if test -z "$CC"; then if test -n "$ac_tool_prefix"; then # Extract the first word of "${ac_tool_prefix}cc", so it can be a program name with args. set dummy ${ac_tool_prefix}cc; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$CC"; then ac_cv_prog_CC="$CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_CC="${ac_tool_prefix}cc" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi CC=$ac_cv_prog_CC if test -n "$CC"; then echo "$as_me:$LINENO: result: $CC" >&5 echo "${ECHO_T}$CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi fi if test -z "$ac_cv_prog_CC"; then ac_ct_CC=$CC # Extract the first word of "cc", so it can be a program name with args. set dummy cc; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_ac_ct_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$ac_ct_CC"; then ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_ac_ct_CC="cc" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi ac_ct_CC=$ac_cv_prog_ac_ct_CC if test -n "$ac_ct_CC"; then echo "$as_me:$LINENO: result: $ac_ct_CC" >&5 echo "${ECHO_T}$ac_ct_CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi CC=$ac_ct_CC else CC="$ac_cv_prog_CC" fi fi if test -z "$CC"; then # Extract the first word of "cc", so it can be a program name with args. set dummy cc; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$CC"; then ac_cv_prog_CC="$CC" # Let the user override the test. else ac_prog_rejected=no as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then if test "$as_dir/$ac_word$ac_exec_ext" = "/usr/ucb/cc"; then ac_prog_rejected=yes continue fi ac_cv_prog_CC="cc" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done if test $ac_prog_rejected = yes; then # We found a bogon in the path, so make sure we never use it. set dummy $ac_cv_prog_CC shift if test $# != 0; then # We chose a different compiler from the bogus one. # However, it has the same basename, so the bogon will be chosen # first if we set CC to just the basename; use the full file name. shift ac_cv_prog_CC="$as_dir/$ac_word${1+' '}$@" fi fi fi fi CC=$ac_cv_prog_CC if test -n "$CC"; then echo "$as_me:$LINENO: result: $CC" >&5 echo "${ECHO_T}$CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi fi if test -z "$CC"; then if test -n "$ac_tool_prefix"; then for ac_prog in cl do # Extract the first word of "$ac_tool_prefix$ac_prog", so it can be a program name with args. set dummy $ac_tool_prefix$ac_prog; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$CC"; then ac_cv_prog_CC="$CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_CC="$ac_tool_prefix$ac_prog" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi CC=$ac_cv_prog_CC if test -n "$CC"; then echo "$as_me:$LINENO: result: $CC" >&5 echo "${ECHO_T}$CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi test -n "$CC" && break done fi if test -z "$CC"; then ac_ct_CC=$CC for ac_prog in cl do # Extract the first word of "$ac_prog", so it can be a program name with args. set dummy $ac_prog; ac_word=$2 echo "$as_me:$LINENO: checking for $ac_word" >&5 echo $ECHO_N "checking for $ac_word... $ECHO_C" >&6 if test "${ac_cv_prog_ac_ct_CC+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if test -n "$ac_ct_CC"; then ac_cv_prog_ac_ct_CC="$ac_ct_CC" # Let the user override the test. else as_save_IFS=$IFS; IFS=$PATH_SEPARATOR for as_dir in $PATH do IFS=$as_save_IFS test -z "$as_dir" && as_dir=. for ac_exec_ext in '' $ac_executable_extensions; do if $as_executable_p "$as_dir/$ac_word$ac_exec_ext"; then ac_cv_prog_ac_ct_CC="$ac_prog" echo "$as_me:$LINENO: found $as_dir/$ac_word$ac_exec_ext" >&5 break 2 fi done done fi fi ac_ct_CC=$ac_cv_prog_ac_ct_CC if test -n "$ac_ct_CC"; then echo "$as_me:$LINENO: result: $ac_ct_CC" >&5 echo "${ECHO_T}$ac_ct_CC" >&6 else echo "$as_me:$LINENO: result: no" >&5 echo "${ECHO_T}no" >&6 fi test -n "$ac_ct_CC" && break done CC=$ac_ct_CC fi fi test -z "$CC" && { { echo "$as_me:$LINENO: error: no acceptable C compiler found in \$PATH See \`config.log' for more details." >&5 echo "$as_me: error: no acceptable C compiler found in \$PATH See \`config.log' for more details." >&2;} { (exit 1); exit 1; }; } # Provide some information about the compiler. echo "$as_me:$LINENO:" \ "checking for C compiler version" >&5 ac_compiler=`set X $ac_compile; echo $2` { (eval echo "$as_me:$LINENO: \"$ac_compiler --version &5\"") >&5 (eval $ac_compiler --version &5) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } { (eval echo "$as_me:$LINENO: \"$ac_compiler -v &5\"") >&5 (eval $ac_compiler -v &5) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } { (eval echo "$as_me:$LINENO: \"$ac_compiler -V &5\"") >&5 (eval $ac_compiler -V &5) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ int main () { ; return 0; } _ACEOF ac_clean_files_save=$ac_clean_files ac_clean_files="$ac_clean_files a.out a.exe b.out" # Try to create an executable without -o first, disregard a.out. # It will help us diagnose broken compilers, and finding out an intuition # of exeext. echo "$as_me:$LINENO: checking for C compiler default output file name" >&5 echo $ECHO_N "checking for C compiler default output file name... $ECHO_C" >&6 ac_link_default=`echo "$ac_link" | sed 's/ -o *conftest[^ ]*//'` if { (eval echo "$as_me:$LINENO: \"$ac_link_default\"") >&5 (eval $ac_link_default) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; then # Find the output, starting from the most likely. This scheme is # not robust to junk in `.', hence go to wildcards (a.*) only as a last # resort. # Be careful to initialize this variable, since it used to be cached. # Otherwise an old cache value of `no' led to `EXEEXT = no' in a Makefile. ac_cv_exeext= # b.out is created by i960 compilers. for ac_file in a_out.exe a.exe conftest.exe a.out conftest a.* conftest.* b.out do test -f "$ac_file" || continue case $ac_file in *.$ac_ext | *.xcoff | *.tds | *.d | *.pdb | *.xSYM | *.bb | *.bbg | *.o | *.obj ) ;; conftest.$ac_ext ) # This is the source file. ;; [ab].out ) # We found the default executable, but exeext='' is most # certainly right. break;; *.* ) ac_cv_exeext=`expr "$ac_file" : '[^.]*\(\..*\)'` # FIXME: I believe we export ac_cv_exeext for Libtool, # but it would be cool to find out if it's true. Does anybody # maintain Libtool? --akim. export ac_cv_exeext break;; * ) break;; esac done else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 { { echo "$as_me:$LINENO: error: C compiler cannot create executables See \`config.log' for more details." >&5 echo "$as_me: error: C compiler cannot create executables See \`config.log' for more details." >&2;} { (exit 77); exit 77; }; } fi ac_exeext=$ac_cv_exeext echo "$as_me:$LINENO: result: $ac_file" >&5 echo "${ECHO_T}$ac_file" >&6 # Check the compiler produces executables we can run. 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INSTALL=$ac_install_sh fi fi echo "$as_me:$LINENO: result: $INSTALL" >&5 echo "${ECHO_T}$INSTALL" >&6 # Use test -z because SunOS4 sh mishandles braces in ${var-val}. # It thinks the first close brace ends the variable substitution. test -z "$INSTALL_PROGRAM" && INSTALL_PROGRAM='${INSTALL}' test -z "$INSTALL_SCRIPT" && INSTALL_SCRIPT='${INSTALL}' test -z "$INSTALL_DATA" && INSTALL_DATA='${INSTALL} -m 644' ac_ext=c ac_cpp='$CPP $CPPFLAGS' ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ac_compiler_gnu=$ac_cv_c_compiler_gnu echo "$as_me:$LINENO: checking how to run the C preprocessor" >&5 echo $ECHO_N "checking how to run the C preprocessor... $ECHO_C" >&6 # On Suns, sometimes $CPP names a directory. if test -n "$CPP" && test -d "$CPP"; then CPP= fi if test -z "$CPP"; then if test "${ac_cv_prog_CPP+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else # Double quotes because CPP needs to be expanded for CPP in "$CC -E" "$CC -E -traditional-cpp" "/lib/cpp" do ac_preproc_ok=false for ac_c_preproc_warn_flag in '' yes do # Use a header file that comes with gcc, so configuring glibc # with a fresh cross-compiler works. # Prefer to if __STDC__ is defined, since # exists even on freestanding compilers. # On the NeXT, cc -E runs the code through the compiler's parser, # not just through cpp. "Syntax error" is here to catch this case. cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #ifdef __STDC__ # include #else # include #endif Syntax error _ACEOF if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5 (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } >/dev/null; then if test -s conftest.err; then ac_cpp_err=$ac_c_preproc_warn_flag ac_cpp_err=$ac_cpp_err$ac_c_werror_flag else ac_cpp_err= fi else ac_cpp_err=yes fi if test -z "$ac_cpp_err"; then : else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 # Broken: fails on valid input. continue fi rm -f conftest.err conftest.$ac_ext # OK, works on sane cases. Now check whether non-existent headers # can be detected and how. cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include _ACEOF if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5 (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } >/dev/null; then if test -s conftest.err; then ac_cpp_err=$ac_c_preproc_warn_flag ac_cpp_err=$ac_cpp_err$ac_c_werror_flag else ac_cpp_err= fi else ac_cpp_err=yes fi if test -z "$ac_cpp_err"; then # Broken: success on invalid input. continue else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 # Passes both tests. ac_preproc_ok=: break fi rm -f conftest.err conftest.$ac_ext done # Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped. rm -f conftest.err conftest.$ac_ext if $ac_preproc_ok; then break fi done ac_cv_prog_CPP=$CPP fi CPP=$ac_cv_prog_CPP else ac_cv_prog_CPP=$CPP fi echo "$as_me:$LINENO: result: $CPP" >&5 echo "${ECHO_T}$CPP" >&6 ac_preproc_ok=false for ac_c_preproc_warn_flag in '' yes do # Use a header file that comes with gcc, so configuring glibc # with a fresh cross-compiler works. # Prefer to if __STDC__ is defined, since # exists even on freestanding compilers. # On the NeXT, cc -E runs the code through the compiler's parser, # not just through cpp. "Syntax error" is here to catch this case. cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #ifdef __STDC__ # include #else # include #endif Syntax error _ACEOF if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5 (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } >/dev/null; then if test -s conftest.err; then ac_cpp_err=$ac_c_preproc_warn_flag ac_cpp_err=$ac_cpp_err$ac_c_werror_flag else ac_cpp_err= fi else ac_cpp_err=yes fi if test -z "$ac_cpp_err"; then : else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 # Broken: fails on valid input. continue fi rm -f conftest.err conftest.$ac_ext # OK, works on sane cases. Now check whether non-existent headers # can be detected and how. cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include _ACEOF if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5 (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } >/dev/null; then if test -s conftest.err; then ac_cpp_err=$ac_c_preproc_warn_flag ac_cpp_err=$ac_cpp_err$ac_c_werror_flag else ac_cpp_err= fi else ac_cpp_err=yes fi if test -z "$ac_cpp_err"; then # Broken: success on invalid input. continue else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 # Passes both tests. ac_preproc_ok=: break fi rm -f conftest.err conftest.$ac_ext done # Because of `break', _AC_PREPROC_IFELSE's cleaning code was skipped. rm -f conftest.err conftest.$ac_ext if $ac_preproc_ok; then : else { { echo "$as_me:$LINENO: error: C preprocessor \"$CPP\" fails sanity check See \`config.log' for more details." >&5 echo "$as_me: error: C preprocessor \"$CPP\" fails sanity check See \`config.log' for more details." >&2;} { (exit 1); exit 1; }; } fi ac_ext=c ac_cpp='$CPP $CPPFLAGS' ac_compile='$CC -c $CFLAGS $CPPFLAGS conftest.$ac_ext >&5' ac_link='$CC -o conftest$ac_exeext $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS >&5' ac_compiler_gnu=$ac_cv_c_compiler_gnu echo "$as_me:$LINENO: checking for egrep" >&5 echo $ECHO_N "checking for egrep... $ECHO_C" >&6 if test "${ac_cv_prog_egrep+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else if echo a | (grep -E '(a|b)') >/dev/null 2>&1 then ac_cv_prog_egrep='grep -E' else ac_cv_prog_egrep='egrep' fi fi echo "$as_me:$LINENO: result: $ac_cv_prog_egrep" >&5 echo "${ECHO_T}$ac_cv_prog_egrep" >&6 EGREP=$ac_cv_prog_egrep echo "$as_me:$LINENO: checking for ANSI C header files" >&5 echo $ECHO_N "checking for ANSI C header files... $ECHO_C" >&6 if test "${ac_cv_header_stdc+set}" = set; then echo $ECHO_N "(cached) $ECHO_C" >&6 else cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include #include #include #include int main () { ; return 0; } _ACEOF rm -f conftest.$ac_objext if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5 (eval $ac_compile) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } && { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; } && { ac_try='test -s conftest.$ac_objext' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; }; then ac_cv_header_stdc=yes else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 ac_cv_header_stdc=no fi rm -f conftest.err conftest.$ac_objext conftest.$ac_ext if test $ac_cv_header_stdc = yes; then # SunOS 4.x string.h does not declare mem*, contrary to ANSI. cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include _ACEOF if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | $EGREP "memchr" >/dev/null 2>&1; then : else ac_cv_header_stdc=no fi rm -f conftest* fi if test $ac_cv_header_stdc = yes; then # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI. cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include _ACEOF if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | $EGREP "free" >/dev/null 2>&1; then : else ac_cv_header_stdc=no fi rm -f conftest* fi if test $ac_cv_header_stdc = yes; then # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi. if test "$cross_compiling" = yes; then : else cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include #if ((' ' & 0x0FF) == 0x020) # define ISLOWER(c) ('a' <= (c) && (c) <= 'z') # define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c)) #else # define ISLOWER(c) \ (('a' <= (c) && (c) <= 'i') \ || ('j' <= (c) && (c) <= 'r') \ || ('s' <= (c) && (c) <= 'z')) # define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c)) #endif #define XOR(e, f) (((e) && !(f)) || (!(e) && (f))) int main () { int i; for (i = 0; i < 256; i++) if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2); exit (0); } _ACEOF rm -f conftest$ac_exeext if { (eval echo "$as_me:$LINENO: \"$ac_link\"") >&5 (eval $ac_link) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } && { ac_try='./conftest$ac_exeext' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; }; then : else echo "$as_me: program exited with status $ac_status" >&5 echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 ( exit $ac_status ) ac_cv_header_stdc=no fi rm -f core *.core gmon.out bb.out conftest$ac_exeext conftest.$ac_objext conftest.$ac_ext fi fi fi echo "$as_me:$LINENO: result: $ac_cv_header_stdc" >&5 echo "${ECHO_T}$ac_cv_header_stdc" >&6 if test $ac_cv_header_stdc = yes; then cat >>confdefs.h <<\_ACEOF #define STDC_HEADERS 1 _ACEOF fi # On IRIX 5.3, sys/types and inttypes.h are conflicting. for ac_header in sys/types.h sys/stat.h stdlib.h string.h memory.h strings.h \ inttypes.h stdint.h unistd.h do as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh` echo "$as_me:$LINENO: checking for $ac_header" >&5 echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6 if eval "test \"\${$as_ac_Header+set}\" = set"; then echo $ECHO_N "(cached) $ECHO_C" >&6 else cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ $ac_includes_default #include <$ac_header> _ACEOF rm -f conftest.$ac_objext if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5 (eval $ac_compile) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } && { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; } && { ac_try='test -s conftest.$ac_objext' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; }; then eval "$as_ac_Header=yes" else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 eval "$as_ac_Header=no" fi rm -f conftest.err conftest.$ac_objext conftest.$ac_ext fi echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5 echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6 if test `eval echo '${'$as_ac_Header'}'` = yes; then cat >>confdefs.h <<_ACEOF #define `echo "HAVE_$ac_header" | $as_tr_cpp` 1 _ACEOF fi done for ac_header in getopt.h memory.h stdlib.h string.h strings.h signal.h syslog.h unistd.h do as_ac_Header=`echo "ac_cv_header_$ac_header" | $as_tr_sh` if eval "test \"\${$as_ac_Header+set}\" = set"; then echo "$as_me:$LINENO: checking for $ac_header" >&5 echo $ECHO_N "checking for $ac_header... $ECHO_C" >&6 if eval "test \"\${$as_ac_Header+set}\" = set"; then echo $ECHO_N "(cached) $ECHO_C" >&6 fi echo "$as_me:$LINENO: result: `eval echo '${'$as_ac_Header'}'`" >&5 echo "${ECHO_T}`eval echo '${'$as_ac_Header'}'`" >&6 else # Is the header compilable? echo "$as_me:$LINENO: checking $ac_header usability" >&5 echo $ECHO_N "checking $ac_header usability... $ECHO_C" >&6 cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ $ac_includes_default #include <$ac_header> _ACEOF rm -f conftest.$ac_objext if { (eval echo "$as_me:$LINENO: \"$ac_compile\"") >&5 (eval $ac_compile) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } && { ac_try='test -z "$ac_c_werror_flag" || test ! -s conftest.err' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; } && { ac_try='test -s conftest.$ac_objext' { (eval echo "$as_me:$LINENO: \"$ac_try\"") >&5 (eval $ac_try) 2>&5 ac_status=$? echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); }; }; then ac_header_compiler=yes else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 ac_header_compiler=no fi rm -f conftest.err conftest.$ac_objext conftest.$ac_ext echo "$as_me:$LINENO: result: $ac_header_compiler" >&5 echo "${ECHO_T}$ac_header_compiler" >&6 # Is the header present? echo "$as_me:$LINENO: checking $ac_header presence" >&5 echo $ECHO_N "checking $ac_header presence... $ECHO_C" >&6 cat >conftest.$ac_ext <<_ACEOF /* confdefs.h. */ _ACEOF cat confdefs.h >>conftest.$ac_ext cat >>conftest.$ac_ext <<_ACEOF /* end confdefs.h. */ #include <$ac_header> _ACEOF if { (eval echo "$as_me:$LINENO: \"$ac_cpp conftest.$ac_ext\"") >&5 (eval $ac_cpp conftest.$ac_ext) 2>conftest.er1 ac_status=$? grep -v '^ *+' conftest.er1 >conftest.err rm -f conftest.er1 cat conftest.err >&5 echo "$as_me:$LINENO: \$? = $ac_status" >&5 (exit $ac_status); } >/dev/null; then if test -s conftest.err; then ac_cpp_err=$ac_c_preproc_warn_flag ac_cpp_err=$ac_cpp_err$ac_c_werror_flag else ac_cpp_err= fi else ac_cpp_err=yes fi if test -z "$ac_cpp_err"; then ac_header_preproc=yes else echo "$as_me: failed program was:" >&5 sed 's/^/| /' conftest.$ac_ext >&5 ac_header_preproc=no fi rm -f conftest.err conftest.$ac_ext echo "$as_me:$LINENO: result: $ac_header_preproc" >&5 echo "${ECHO_T}$ac_header_preproc" >&6 # So? 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So we exec the FD to /dev/null, # effectively closing config.log, so it can be properly (re)opened and # appended to by config.status. When coming back to configure, we # need to make the FD available again. if test "$no_create" != yes; then ac_cs_success=: ac_config_status_args= test "$silent" = yes && ac_config_status_args="$ac_config_status_args --quiet" exec 5>/dev/null $SHELL $CONFIG_STATUS $ac_config_status_args || ac_cs_success=false exec 5>>config.log # Use ||, not &&, to avoid exiting from the if with $? = 1, which # would make configure fail if this is the last instruction. $ac_cs_success || { (exit 1); exit 1; } fi renattach-1.2.4/AUTHORS0000644000175000001440000000205710130672716010223 Jem Berkes [ www.sysdesign.ca ] is the original and primary author of renattach. Version 1.2.0 is a complete rewrite with all-original code. Many people around the world have helped test and improve this filter. In particular, I would like to thank the following people for their contributions to this project: Stefan A. Deutscher has helped improve renattach so it builds smoothly on a wider variety of platforms (including OS/2). He has also contributed FreeBSD and other ports. Richard Gadsden, at the Medical University of South Carolina, has suggested and debugged many software improvements over the years. He has also tested renattach on a major mail server and provided valuable feedback about bugs. Hal Murray contributed a collection of real email viruses and worms that helped verify the filter's effectiveness. Colin McKinnon suggested several features and contributed code to the 1.1.x series. The improved renaming technique and procmail-compatible filtering he suggested were built into version 1.2.0. renattach-1.2.4/COPYING0000644000175000001440000003544607746376626010242 GNU GENERAL PUBLIC LICENSE Version 2, June 1991 Copyright (C) 1989, 1991 Free Software Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The licenses for most software are designed to take away your freedom to share and change it. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change free software--to make sure the software is free for all its users. This General Public License applies to most of the Free Software Foundation's software and to any other program whose authors commit to using it. (Some other Free Software Foundation software is covered by the GNU Library General Public License instead.) You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. Our General Public Licenses are designed to make sure that you have the freedom to distribute copies of free software (and charge for this service if you wish), that you receive source code or can get it if you want it, that you can change the software or use pieces of it in new free programs; and that you know you can do these things. To protect your rights, we need to make restrictions that forbid anyone to deny you these rights or to ask you to surrender the rights. These restrictions translate to certain responsibilities for you if you distribute copies of the software, or if you modify it. For example, if you distribute copies of such a program, whether gratis or for a fee, you must give the recipients all the rights that you have. You must make sure that they, too, receive or can get the source code. And you must show them these terms so they know their rights. 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IT IS NO LONGER MAINTAINED. 1.2.4 changes ============= - New --loop option removes Delivered-To headers from the input message This defends Postfix against a "mail forwarding loop" spam relay trick 1.2.3 changes ============= - Fixed a MIME parser bug where some headers were incorrectly sanitized (Thanks to Adam Harper for providing the patch) - Added support for '#' to suppress new_extension, submitted by bhoc@pentagroup.ch - Fixed build scripts to handle getopt properly. Now builds cleanly on FreeBSD 1.2.2 changes ============== - [SECURITY] The --pipe now directly executes command/args, instead of popen() NOTE new --pipe syntax, do not specify quotes around command and its args! (Thanks to Victor.Duchovni@MorganStanley.com for illustrating the problem) - Added preprocessor directives to help with OS/2, win32, other builds (Thanks to sad@mailaps.org for help tweaking the build) - Relaxed RFC 2047 decoder to support more clients (e.g. The Bat) (Thanks to IL for reporting the problem) - Fixed base64 decoding bug affecting non-English file names - Added htmlwarn_pos option to specify insertion position for warning_html - Added warning_text, warning_html options to add warnings to message body - Fixed compile error on signal() 1.2.1 changes ============= - [SECURITY] Shell characters are now stripped when using --pipe - Now keeps headers inserted by previous renattach passes, using Old- prefix - Added full_rename option to allow selection of full or partial rename scheme - Added pass_contentid option to pass MIME Content-ID through filter (risky) - Enhanced badlist format to include specific actions for matches inside ZIP - Added search_zip option to enable file name searching inside ZIP archives - Added kill_exe option to kill executable binary attachments (like delete_exe) - Now supports Outlook-style multiline encoded filenames 1.2.0 changes ============= - Changed --excode (extra exitcode) to more sensible value - Added new .conf options to allow specific subjects for ban, exe delete, etc. - Added default add_subject to inform user of filtering (use # to disable) 1.2.0rc3 changes ================ - Created man page for version 1.2.0 - Tested and documented sendmail compatibility (local delivery agent) - Enhanced badlist format; specific actions can override default action 1.2.0rc2 changes ================ - If message Subject is to be modified but doesn't exist, Subject: is added - Removed default add_subject, otherwise there is no way to disable feature - Enhanced banned_files format to allow substring matches (prepend '/') - Relaxed MIME parser to allow whitespace between MIME_NAME and equals sign - Added more leeway to executable binary scan (used by delete_exe feature) - The .conf file parser can now deal with CRLF (DOS format) text files - Tested and documented postfix compatibility (master.cf / content_filter) - Added --pipe option to send output to a command instead of stdout - Improved behaviour of --excode and --version options - Added --settings option to view configuration 1.2.0rc1 changes ================ - COMPLETE rewrite of software. Now much more structured, flexible - Now uses autoconf/automake and getopt for more standard behaviour - All new command line options and .conf file format - Supports RFC 2047, RFC 2231, MIME and common variations - Other changes too numerous to list here. See documentation. 1.1.1 changes ============= - Added a FAQ - Modified scripts to be more Solaris-friendly - The MIME content-type is renamed whenever a file is renamed - Uses generic filename if encoded filename is found (remove in defs.h) - Now uses syslog. Enabled by default (remove in defs.h) - More checks for buffer overflows in make_safe() - Confirmed that it works fine with postfix and qmail - The -v switch now shows version string - Improved efficiency by strncmp'ing before sscanf'ing 1.1.0 changes ============= - Added scripts! configure, make, install, uninstall - Wrote a manpage - Converted code to 100% pure C - Upper limit placed on growing-dynamic-buffer algorithm - Reads good and bad extensions lists from .conf file - Partial mode renamed to badlist mode - Default bad list made much more complete (see renattach.conf) 1.02 changes ============ - Improved some error handling (nothing critical) - Added goodlist mode; renames all except 'good' extensions - Made code in is_match() more sleek - Can now act as a procmail filter. See README-procmail - Added switch to write to stdout [from Colin McKinnon] - Modified file rename technique [from Colin McKinnon] 1.01 changes ============ - Added MTA_TAIL (for customizing MTA switches) - Added default sendmail switch (-i) to fix odd forwarding behaviour 1.00 changes ============ - Now released under the GNU General Public License (GNU GPL) - Greatly improved MIME file name parser - Now uses dynamic buffer allocation - Cleverly placed names can no longer "slip past" the filter - Other minor changes (thanks to David F. Skoll for his suggestions) renattach-1.2.4/INSTALL0000644000175000001440000002122610517520647010207 ************************************************************************ WARNING: THIS SOFTWARE HAS BEEN DISCONTINUED. IT IS NO LONGER MAINTAINED. ************************************************************************ The author recommends that you do not depend upon renattach to filter emails for dangerous content. As of 2006, renattach used on its own is not enough to filter potentially harmful emails. Dangerous attachments, or other attacks, may pass through the filter undetected. Please switch from renattach to some other actively developed security system. Jem E. Berkes 2006-03-19 ************************************************************************ The build & install is automated by autoconf and automake. Basic steps: ./configure make make install By default, the binary 'renattach' is put in '/usr/local/bin' and the example conf file 'renattach.conf.ex' is put in '/usr/local/etc'. Please run "./configure --help" to see all the options. For instance, to install under your home directory: "./configure --prefix=$HOME" To customize your installation, modify the options in renattach.conf. Use the command "renattach --settings" to see the active configuration. Since renattach is a standard UNIX filter, it can be installed into a wide variety of mailing systems. The filter reads a single email message as input at stdin, then writes the filtered output either to stdout or to a pipe (external command) if the --pipe option is used. There are many ways to install renattach in both the user and site-wide contexts. The cases below are by no means exhaustive. ============================= procmail for individual users ============================= Most mail servers use procmail for local mail delivery. This is the default configuration for Sendmail. In Postfix, main.cf has to include: mailbox_command = /usr/bin/procmail If your site uses procmail, then you can create the ".procmailrc" file in your home directory to instruct procmail to run certain scripts. The following basic ".procmailrc" will filter all incoming mail through renattach. Please see "man procmailrc" to learn more about the format: # Filter mail through renattach, and wait for success exit code :0 wf | /path/to/renattach There is a minor complication when using renattach's "kill" feature since nothing will leave the filter. Procmail does not know to stop processing, so it will deliver a blank stub of a message to your mailbox. To prevent this, you can add this rule after renattach to handle killed messages: # If message is blank (killed), drop it and stop processing. :0 *! . /dev/null ================================= procmail for entire site (global) ================================= If your site uses procmail, then you can take advantage of procmail's site-wide filtering capabilities via the /etc/procmailrc configuration file. You can use the same filtering 'rule' as in the above example for individual users. Please see "man procmail" for more information. Please check to make sure that procmail does not run procmailrc with root privileges. renattach SHOULD NOT run as 'root'. =================== Postfix integration =================== The Postfix MTA has a flexible modular design that makes it relatively easy to add content filters such as renattach. There are several advantages to installing renattach at the MTA level: + Tighter integration into the mail system, ensuring that all mail is filtered (instead of relying on procmail operating correctly) + Possibility for both inbound and outbound SMTP filtering + Superior security, since the filter can run under dedicated UID + Superior feedback on filtering errors (mail bounces or temporary failures) due to strict interpretation of filter exit codes. In other words, if renattach encounters a temporary error such as resource shortage or dead external pipe, mail will remain queued and delivery will be attempted later. If renattach encounters a fatal error (bad command usage) then mail will bounce. To install renattach, you only need to modify /etc/postfix/master.cf The following instructions are based on Postfix's FILTER_README file and describe how to install renattach as a content filter for SMTP. 1) Create a new user 'filter' with a disabled password, unique group, no home directory and no login shell. /etc/passwd would have something like: filter:*:952:952:filter:/dev/null:/dev/null 2) Insert the following into /etc/postfix/master.cf to define the 'filter' service that uses the Postfix pipe program. Note the long second line; this instructs Postfix to pipe mail into renattach using privileges of the dedicated filter user. You can specify any renattach options you wish. Here, we MUST use renattach's -p (or --pipe) to send the filtered output to the Postfix 'sendmail' command. This re-injects the filtered message back into the mail system. Do not include quotes around the sendmail command line (this has changed in version 1.2.2). filter unix - n n - - pipe flags=q user=filter argv=renattach -l -p sendmail -i -f ${sender} -- ${recipient} The pipe option must be the last option specified, with everything after it being taken as the command and arguments. Be sure to specify the full path to the renattach and sendmail commands. The -l option additionally protects Postfix against a spammer's attack that causes a "mail forwarding loop" to relay spam. (See man page). 3) Now that you have defined a new 'filter' module, you can instruct the smtp module to use 'filter' as a content filter. This is done simply by editing /etc/postfix/master.cf and adding the -o content_filter=filter option to smtpd. This means that the smtp service should appear like this: smtp inet n - n - - smtpd -o content_filter=filter 4) Save master.cf and run 'postfix reload'. Now test your configuration. Any mail coming into your system via SMTP should now leave with the additional renattach headers. The system mail logs should indicate mail being passed with relay=filter. There should also be log entries from the postfix/pipe program. Make sure use_syslog is enabled so that your mail logs show filtered attachments and message-id's. Send some dangerous attachments to confirm that they are filtered and logged. It's important to understand how mail now flows through your system. The following illustrates step-by-step how mail is processed with the above configuration: a. Client connects to server:25 (smtpd) and uploads an email b. smtpd relays the mail to the content filter, the 'filter' service c. The 'filter' service pipes the mail to renattach d. renattach pipes its output to the Postfix sendmail command, specifying as command line options the original sender and recipient(s). If that sendmail command fails in any way, renattach's exit code tells Postfix to keep the mail queued and retry later (no mail is lost). e. The sendmail command locally re-injects the mail into the system f. Delivery continues as normal ==================== sendmail integration ==================== While the procmail-based methods described earlier are probably the best way to install renattach on a sendmail server, it is also possible to install renattach as the local delivery agent (Mlocal option). In this configuration, renattach sits between sendmail and procmail. Installations typically rely on procmail. The following example shows a standard configuration before renattach is installed: Mlocal, P=/usr/bin/procmail, F=lsDFMAw5:/|@qSPfhn9, S=EnvFromL/HdrFromL, R=EnvToL/HdrToL, T=DNS/RFC822/X-Unix, A=procmail -t -Y -a $h -d $u Instead of invoking procmail as the local mail delivery agent, sendmail can invoke renattach and instruct the filter to pipe its output to procmail (or any other program, as required). Few changes are required to the above configuration: Mlocal, P=/usr/local/bin/renattach, F=lsDFMAw5:/|@qSPhn9, S=EnvFromL/HdrFromL, R=EnvToL/HdrToL, T=DNS/RFC822/X-Unix, A=renattach --pipe /usr/bin/procmail -f $g -t -Y -d $u Note the following: o The F=f (lowercase 'f' flag) must be removed from the flags field, because this automatically places the -f option in the wrong place. The procmail -f option is manually specified after --pipe. o The procmail -a feature (for passing meta data) appeared to be causing strange problems. Removing it solved delivery problems we encountered. ========================================================================= sendmail support has NOT been thoroughly tested. Details of sendmail (and other MTA) installation is beyond the scope of this document. These basic installation instructions are provided as a convenience. ========================================================================= renattach-1.2.4/NEWS0000644000175000001440000000236610407424116007651 ************************************************************************ WARNING: THIS SOFTWARE HAS BEEN DISCONTINUED. IT IS NO LONGER MAINTAINED. ************************************************************************ The author recommends that you do not depend upon renattach to filter emails for dangerous content. As of 2006, renattach used on its own is not enough to filter potentially harmful emails. Dangerous attachments, or other attacks, may pass through the filter undetected. Please switch from renattach to some other actively developed security system. Jem E. Berkes 2006-03-19 ************************************************************************ If you are upgrading from version 1.2.1 or earlier, the important thing to note is the change in the --pipe feature usage (since 1.2.2). The -p or --pipe option now has to be the last option specified on the command line. Any arguments after this are taken as-is, interpreted as the command to execute and its arguments. Quotation marks should NOT be included around the entire command to execute. Also be sure to include the full pathname of the command, since there is no PATH search for the command. An example of use: renattach -d -p /usr/sbin/sendmail -i user@domain renattach-1.2.4/depcomp0000744000175000001440000003305207733427017010534 #! /bin/sh # depcomp - compile a program generating dependencies as side-effects # Copyright 1999, 2000, 2003 Free Software Foundation, Inc. # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2, or (at your option) # any later version. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # You should have received a copy of the GNU General Public License # along with this program; if not, write to the Free Software # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA # 02111-1307, USA. # As a special exception to the GNU General Public License, if you # distribute this file as part of a program that contains a # configuration script generated by Autoconf, you may include it under # the same distribution terms that you use for the rest of that program. # Originally written by Alexandre Oliva . if test -z "$depmode" || test -z "$source" || test -z "$object"; then echo "depcomp: Variables source, object and depmode must be set" 1>&2 exit 1 fi # `libtool' can also be set to `yes' or `no'. if test -z "$depfile"; then base=`echo "$object" | sed -e 's,^.*/,,' -e 's,\.\([^.]*\)$,.P\1,'` dir=`echo "$object" | sed 's,/.*$,/,'` if test "$dir" = "$object"; then dir= fi # FIXME: should be _deps on DOS. depfile="$dir.deps/$base" fi tmpdepfile=${tmpdepfile-`echo "$depfile" | sed 's/\.\([^.]*\)$/.T\1/'`} rm -f "$tmpdepfile" # Some modes work just like other modes, but use different flags. We # parameterize here, but still list the modes in the big case below, # to make depend.m4 easier to write. Note that we *cannot* use a case # here, because this file can only contain one case statement. if test "$depmode" = hp; then # HP compiler uses -M and no extra arg. gccflag=-M depmode=gcc fi if test "$depmode" = dashXmstdout; then # This is just like dashmstdout with a different argument. dashmflag=-xM depmode=dashmstdout fi case "$depmode" in gcc3) ## gcc 3 implements dependency tracking that does exactly what ## we want. Yay! Note: for some reason libtool 1.4 doesn't like ## it if -MD -MP comes after the -MF stuff. Hmm. "$@" -MT "$object" -MD -MP -MF "$tmpdepfile" stat=$? if test $stat -eq 0; then : else rm -f "$tmpdepfile" exit $stat fi mv "$tmpdepfile" "$depfile" ;; gcc) ## There are various ways to get dependency output from gcc. Here's ## why we pick this rather obscure method: ## - Don't want to use -MD because we'd like the dependencies to end ## up in a subdir. Having to rename by hand is ugly. ## (We might end up doing this anyway to support other compilers.) ## - The DEPENDENCIES_OUTPUT environment variable makes gcc act like ## -MM, not -M (despite what the docs say). ## - Using -M directly means running the compiler twice (even worse ## than renaming). if test -z "$gccflag"; then gccflag=-MD, fi "$@" -Wp,"$gccflag$tmpdepfile" stat=$? if test $stat -eq 0; then : else rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" echo "$object : \\" > "$depfile" alpha=ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz ## The second -e expression handles DOS-style file names with drive letters. sed -e 's/^[^:]*: / /' \ -e 's/^['$alpha']:\/[^:]*: / /' < "$tmpdepfile" >> "$depfile" ## This next piece of magic avoids the `deleted header file' problem. ## The problem is that when a header file which appears in a .P file ## is deleted, the dependency causes make to die (because there is ## typically no way to rebuild the header). We avoid this by adding ## dummy dependencies for each header file. Too bad gcc doesn't do ## this for us directly. tr ' ' ' ' < "$tmpdepfile" | ## Some versions of gcc put a space before the `:'. On the theory ## that the space means something, we add a space to the output as ## well. ## Some versions of the HPUX 10.20 sed can't process this invocation ## correctly. Breaking it into two sed invocations is a workaround. sed -e 's/^\\$//' -e '/^$/d' -e '/:$/d' | sed -e 's/$/ :/' >> "$depfile" rm -f "$tmpdepfile" ;; hp) # This case exists only to let depend.m4 do its work. It works by # looking at the text of this script. This case will never be run, # since it is checked for above. exit 1 ;; sgi) if test "$libtool" = yes; then "$@" "-Wp,-MDupdate,$tmpdepfile" else "$@" -MDupdate "$tmpdepfile" fi stat=$? if test $stat -eq 0; then : else rm -f "$tmpdepfile" exit $stat fi rm -f "$depfile" if test -f "$tmpdepfile"; then # yes, the sourcefile depend on other files echo "$object : \\" > "$depfile" # Clip off the initial element (the dependent). Don't try to be # clever and replace this with sed code, as IRIX sed won't handle # lines with more than a fixed number of characters (4096 in # IRIX 6.2 sed, 8192 in IRIX 6.5). 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IN NO EVENT SHALL THE # X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN # AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNEC- # TION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. # # Except as contained in this notice, the name of the X Consortium shall not # be used in advertising or otherwise to promote the sale, use or other deal- # ings in this Software without prior written authorization from the X Consor- # tium. # # # FSF changes to this file are in the public domain. # # Calling this script install-sh is preferred over install.sh, to prevent # `make' implicit rules from creating a file called install from it # when there is no Makefile. # # This script is compatible with the BSD install script, but was written # from scratch. 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You may also peek at any GNU archive site, in case some other package would contain this missing \`$1' program." exit 1 ;; esac exit 0 renattach-1.2.4/mkinstalldirs0000744000175000001440000000370407733427017011766 #! /bin/sh # mkinstalldirs --- make directory hierarchy # Author: Noah Friedman # Created: 1993-05-16 # Public domain errstatus=0 dirmode="" usage="\ Usage: mkinstalldirs [-h] [--help] [-m mode] dir ..." # process command line arguments while test $# -gt 0 ; do case $1 in -h | --help | --h*) # -h for help echo "$usage" 1>&2 exit 0 ;; -m) # -m PERM arg shift test $# -eq 0 && { echo "$usage" 1>&2; exit 1; } dirmode=$1 shift ;; --) # stop option processing shift break ;; -*) # unknown option echo "$usage" 1>&2 exit 1 ;; *) # first non-opt arg break ;; esac done for file do if test -d "$file"; then shift else break fi done case $# in 0) exit 0 ;; esac case $dirmode in '') if mkdir -p -- . 2>/dev/null; then echo "mkdir -p -- $*" exec mkdir -p -- "$@" fi ;; *) if mkdir -m "$dirmode" -p -- . 2>/dev/null; then echo "mkdir -m $dirmode -p -- $*" exec mkdir -m "$dirmode" -p -- "$@" fi ;; esac for file do set fnord `echo ":$file" | sed -ne 's/^:\//#/;s/^://;s/\// /g;s/^#/\//;p'` shift pathcomp= for d do pathcomp="$pathcomp$d" case $pathcomp in -*) pathcomp=./$pathcomp ;; esac if test ! -d "$pathcomp"; then echo "mkdir $pathcomp" mkdir "$pathcomp" || lasterr=$? if test ! -d "$pathcomp"; then errstatus=$lasterr else if test ! -z "$dirmode"; then echo "chmod $dirmode $pathcomp" lasterr="" chmod "$dirmode" "$pathcomp" || lasterr=$? if test ! -z "$lasterr"; then errstatus=$lasterr fi fi fi fi pathcomp="$pathcomp/" done done exit $errstatus # Local Variables: # mode: shell-script # sh-indentation: 2 # End: # mkinstalldirs ends here renattach-1.2.4/src/0000777000175000001440000000000010517521266010024 5renattach-1.2.4/src/renattach.10000644000175000001440000003247210517520215011774 .TH RENATTACH "1" "October 2006" "renattach" .SH NAME renattach \- rename/delete dangerous email attachments .SH SYNOPSIS .B renattach [\fIOPTIONS\fR] .SH DESCRIPTION renattach is a fast and efficient UNIX stream filter that can rename or delete potentially dangerous e-mail attachments. It's a highly effective way of protecting end-users from harmful mail content (worms/viruses) by disabling or removing attachments that may be accidentally executed by users. The filter is invoked as a simple pipe for use in a wide variety of systems. The 'kill' feature (which eliminates entire messages) can also help sites deal with resource strains caused by modern virus floods. renattach is written in pure C and can quickly process mail with little overhead. Unlike a conventional virus scanner, there are no specific virus or worm definitions. Instead, renattach identifies potentially dangerous attachments based on file extension and executable encoded body content. The software is even capable of reading filenames from inside ZIP archives on the fly, without requiring any external software. The self-contained MIME code parses, fully interprets, then rewrites the header of every attached file. During this process it checks the file's extension against a list, and further checks to make sure the filename is not on a banned list. Only after passing through these steps is the MIME header written fresh using a predetermined, known format. The program's operation is simple: a single mail message is read from stdin, filtered, then written to stdout (or piped to an external command). renattach looks for its configuration file (renattach.conf) in the path specified at compile time. Alternatively, you can specify the location of renattach.conf by using the -c command-line options. For example: \fBrenattach -c renattach.conf\fR .SH OPTIONS Note that the filter's default behaviour is to rename dangerous attachments that match the badlist {mode=badlist, action=rename}. If searching inside ZIP archives for filenames (see the search_zip configuration option), the only actions that modify the ZIP files are delete and kill but NOT rename. Therefore the default rename action has no effect on ZIP files; instead, use the --delete or --kill options. Alternatively, append the /d and /k switches to badlist extensions in the .conf file to selectively delete or kill some file types while just renaming the rest. .HP \fB\-a\fR, \fB\-\-all\fR .IP Filter mode: Match all attachments. .HP \fB\-b\fR, \fB\-\-badlist\fR .IP Filter mode: Only match filenames that have extensions listed on the bad-list. This will match only attachments with known dangerous file extensions (default). .HP \fB\-c\fR, \fB\-\-config\fR filename .IP Use the specified configuration file. Run renattach with \fB\-\-settings\fR to verify the current settings. .HP \fB\-d\fR, \fB\-\-delete\fR .IP Filter action: Delete attachment body after renaming headers. .HP \fB\-e\fR, \fB\-\-excode\fR .IP Extend exitcodes with a new code, 77=filtering occurred. See below for standard exit codes. .HP \fB\-g\fR, \fB\-\-goodlist\fR .IP Filter mode: Match all attachments except those that have extensions listed on the goodlist. .HP \fB\-h\fR, \fB\-\-help\fR .IP Show help, explain options. .HP \fB\-k\fR, \fB\-\-kill\fR .IP Filter action: Kill (absorb) entire email. There is null output. .HP \fB\-l\fR, \fB\-\-loop\fR .IP Remove Delivered-To headers to prevent malicious mail forwarding loop. This can prevent Postfix from inadvertently relaying spam. This option must only be used when renattach is a filter service to the outside world, otherwise you will lose loop protection. Do not use from procmail. .HP \fB\-p\fR, \fB\-\-pipe\fR command [args] .IP Instead of writing output to stdout, open pipe to command (with args) and send output there. This program must return with exit code 0. This must be the last option on the command line. See INSTALL file for instructions on integrating with Postfix as a filter service. .HP \fB\-r\fR, \fB\-\-rename\fR .IP Filter action: Rename matching attachments (default). The MIME type is also renamed to \fBnew_mime_type\fR from the .conf file. .HP \fB\-s\fR, \fB\-\-settings\fR .IP Show current settings/configuration and terminate. .HP \fB\-v\fR, \fB\-\-verbose\fR .IP Write verbose output (including settings) to stderr. .HP \fB\-V\fR, \fB\-\-version\fR .IP Display software version and terminate. .SH EXIT CODES 0 - Success (filtered mail and wrote output) 75 - Temporary failure (resource shortage; failed to write to pipe if using --pipe ) 255 - Critical failure (improper parameters; bad .conf file) The temporary failure code allows MTAs to re-queue mail for later delivery. These exit codes are compatible with BSD-style mailers, and --excode should not be used without good reason because it returns a non-success code when the filter "catches" something. .SH CONFIGURATION FILE The .conf file should be a plaintext file with one configuration directive per line. Comments preceded by # will be ignored. Some directives may only appear once, while others (lists) are additive. The conf file and all directives are optional, as defaults are compiled into the software. NOTE: please run \fBrenattach \-\-settings\fR to verify your configuration! \fIDescription of all options:\fR .nf # renattach 1.2.4 recognizes the following configuration directives. # Delete executable binary attachments by signature. renattach looks # for encoded bytes that identify DOS/Windows executables ('MZ'). # If an executable is found, the encoded attachment will be removed # while the MIME header remains unchanged. This is a feature that # works independently of filename-based filtering, designed as a # backup. The net effect is that encoded executables are deleted. # Specify yes or no, or alternatively 1 or 0 # # delete_exe = yes # Kill executable binary attachments by signature, as in the previous # directive. Note that delete_exe and kill_exe are mutually exclusive. # # kill_exe = no # Search for filenames within ZIP archives using the internal ZIP # parsing engine (no external software required). Any filenames found # are subject to the same checks, for instance badlist or goodlist, # with the notable difference that the RENAME ACTION HAS NO EFFECT on # ZIP files. Only the delete or kill actions will modify ZIP files. # # search_zip = no # Normally, MIME Content-ID fields are dropped during filtering due # to their application-specific use and security risk (recently used # by worms to link malicious code to embedded images). If you are sure # you want to pass Content-ID fields unfiltered, enable this option. # # pass_contentid = no # Normally, all periods in filenames are replaced with underscores # during renaming. Although this is the recommended mode, you can # also disable full renaming if you only want the last period to be # changed to an underscore. # # full_rename = yes # If enabled, all filtering actions will be logged via syslog. # renattach logs with priority 'warning' to facility 'mail' # # use_syslog = no # A generic filename to use when parsing fails. Since renattach # rewrites all attachment headers, it's possible that corruption, # lack of buffer space, or some other problem will prevent filenames # from being recreated. In such a case, this generic name is used. # # generic_name = filename # A replacement file extension to use when changing dangerous # attachment filenames. This extension is appended to the previous # one. For instance virus.pif becomes virus_pif.bad # Specify just # to leave the extension as is, and not rename it. # # new_extension = bad # When attachments are renamed, the MIME type is also changed to # this new_mime_type for safety. # # new_mime_type = application/unknown # The following directives control how the message Subject is # modified to inform the user that filtering has occurred. They # have the following ORDER OF PRIORITY (starting with highest): # subj_banned, subj_exec, subj_deleted, subj_renamed, add_subject # By default, only add_subject is defined so any condition (whether # it's a ban, executable match, delete, or rename) results in the # same Subject addition. If you also define subj_exec then there # could be a different Subject if an executable was caught (since # it has higher priority than add_subject). Another alternative for # these options is to specify the single character # to suppress # Subject modification for that condition. You could use this to be # quiet in case a banned attachment is caught. You can also use # to # turn off add_subject, hence NEVER modify the message Subject. # Add text to Subject if an attachment is caught by banned_files, # shown here in suppression mode to NOT inform user on file ban. # # subj_banned = # # Add text to Subject if an attachment is caught by delete_exe # # subj_exec = [removed executable] # Add text to Subject if an attachment is deleted for any reason # # subj_deleted = [deleted attachment] # Add text to Subject if an attachment is renamed for any reason # # subj_renamed = [renamed attachment] # Add text to Subject if an attachment is filtered in any way. This # has lowest priority, and is only used if previous are undefined. # Use single character # to suppress addition to Subject. # # add_subject = [filtered] # When inserting a warning into HTML parts of messages (warning_html), # this tag defines the preferred position to insert the new HTML. If # the first tag in the list is found, the warning position is placed # just after this tag. As subsequent tags are found, the position # advances after each. # # htmlwarn_pos = html, body # If an attachment is filtered, this lets you specify some warning # text that will be inserted into any plain text portion(s) of the # email. This is effective for informing users of filtered files, # but the act of inserting arbitrary text into an email can cause # new problems. Use with caution. # # warning_text = ******************* # warning_text = MAIL SYSTEM WARNING # warning_text = Attachments removed # warning_text = ******************* # Inserts a warning message into HTML portions of the email when # filtering occurs. The HTML is inserted at a position determined by # htmlwarn_pos (see above) which provides a good hope for adding a # visible warning. Unfortunately, inserting arbitrary HTML is tricky # due to the complexity of markup interactions. Inserting warnings in # HTML may thoroughly disrupt the original message, so use with caution. # # warning_html =

Mail system warning

# warning_html =

Attachments removed

# When enabled, these new headers will be added to the message to # inform the user about filtering that occurred. # # add_header = X-Filtered-0: *** PLEASE NOTE *** # add_header = X-Filtered-1: Potentially dangerous attachments have been # add_header = X-Filtered-2: found in this e-mail, and have either been # add_header = X-Filtered-3: renamed or deleted for your safety. # Catch specifically named, banned attachment filenames and # optionally take an action (r=rename, d=delete, k=kill). This is # an additive option so there is no limit to how many names can be # specified. If the name begins with a forward slash ('/'), this # substring has to be found; '/foo' matches 'foobar' and 'eatfoo' # Otherwise, the whole name has to match. Specify case-insensitive # filenames separated by commas. To specify an action on matching # filename, append /r (rename), /d (delete), or /k (kill) to the # filename as illustrated in the example. # # banned_files = your_details.zip/r, your_details.pif/k # banned_files = movie.pif/d, movie.zip, /winmail/d # A list of good (known-safe) attachment file extensions to use # in goodlist filtering mode. This is an additive option, so there # is no limit to how many filenames can be specified. Specify case- # insensitive extensions separated by commas. # # goodlist = DOC, PDF, RTF, SXC, SXW, TXT, ZIP # A list of bad (known-dangerous) attachment file extensions to use # in badlist filtering mode. This is an additive option, so there # is no limit to how many filenames can be specified. Specify case- # insensitive extensions separated by commas. To specify an action # for an extension, append /r (rename), /d (delete), or /k (kill) # to the filename. This overrides the default action for the filter # and can be used to provide special handling for some extensions. # An additional switch can be used to specify an action only for # files found within ZIP archives. For instance, EXE/k/d tells the # filter to kill emails containing EXE attachments, but if the EXE # was found inside a ZIP then the attachment is deleted, not killed. # # badlist = ADE, ADP, BAS, BAT, CHM, CMD, COM, CPL, CRT, EML, EXE # badlist = HLP, HTA, HTM, HTML, INF, INS, ISP, JS, JSE, LNK, MDB # badlist = MDE, MSC, MSH, MSI, MSP, MST, NWS, OCX, PCD, PIF, REG # badlist = SCR, SCT, SHB, SHS, URL, VB, VBE, VBS, WSC, WSF, WSH .fi .SH FILES renattach.conf .SH SEE ALSO procmail(1) .SH WARRANTY As per the GNU GPL, there is no warranty for this software. The author makes no guarantees as to software performance or effectiveness. renattach is NOT a virus scanner. Filtering is based on MIME headers and detectable filenames; as such, the software tries to handle both correct structures and incorrectly formatted messages. This filter will not catch all dangerous emails, particularly attachments embedded inside attachments. .SH AUTHOR .nf Copyright (C) 2003-2006 Jem E. 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install-exec-am \ install-info install-info-am install-man install-man1 \ install-strip installcheck installcheck-am installdirs \ maintainer-clean maintainer-clean-generic mostlyclean \ mostlyclean-compile mostlyclean-generic pdf pdf-am ps ps-am \ tags uninstall uninstall-am uninstall-binPROGRAMS \ uninstall-info-am uninstall-man uninstall-man1 # Tell versions [3.59,3.63) of GNU make to not export all variables. # Otherwise a system limit (for SysV at least) may be exceeded. .NOEXPORT: renattach-1.2.4/src/renattach.c0000644000175000001440000013142410517512262012056 /* renattach 1.2.4 - Filter that renames/deletes dangerous email attachments Copyright (C) 2003-2006 Jem E. Berkes This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA Warning: renattach 'breaks' MIME because it rewrites MIME headers! Whenever a MIME attachment with filename is encountered, MIME headers are rewritten to a safe format (even if filenames are unchanged). MIME headers that aren't attachments with filenames are left alone. */ #include "config.h" #include "renattach.h" #include "strings-en.h" #include "utility.h" #include #include #include #include #include #include #include #include #include #include #include #ifdef HAVE_SYSLOG_H #include #endif #ifdef __EMX__ #include #endif #ifndef HAVE_STRCASECMP #define strcasecmp stricmp #endif #ifndef HAVE_STRNCASECMP #define strncasecmp strnicmp #endif /* Function prototypes */ int filter_pass(FILE*); int header_pass(FILE*); int is_line_mime(const char*, int, struct attach*); int filter_decision(struct attach*); int match_filename(const char*, int); int decode_2047(char*, struct namespec*); int reencode_name(struct namespec*, const char*, char*); int position_html(FILE*, FILE*); void kill_exit(const char*); void taking_action(const char*); void not_taking_action(const char*, const char*); int explain_subject(FILE*, char*); void abnormalproc(int); FILE* openpipe(char**, pid_t*); int closepipe(FILE*, pid_t, int*); /* Global variables */ struct config_opts configuration; FILE* tempfile = NULL; int loopguard=0, verbose=0, justsettings=0, excode=CODE_OK; int filtcount=0, ban_count=0, exe_count=0, del_count=0, ren_count=0; char messageid[MAXFIELD]; static char shortopts[] = "abc:deghklp:rsvV"; static struct option long_options[] = { {"all", no_argument, NULL, 'a'}, {"badlist", no_argument, NULL, 'b'}, {"config", required_argument, NULL, 'c'}, {"delete", no_argument, NULL, 'd'}, {"excode", no_argument, NULL, 'e'}, {"goodlist", no_argument, NULL, 'g'}, {"help", no_argument, NULL, 'h'}, {"kill", no_argument, NULL, 'k'}, {"loop", no_argument, NULL, 'l'}, {"pipe", required_argument, NULL, 'p'}, {"rename", no_argument, NULL, 'r'}, {"settings", no_argument, NULL, 's'}, {"verbose", no_argument, NULL, 'v'}, {"version", no_argument, NULL, 'V'}, {0, 0, 0, 0} }; int main(int argc, char** argv) { int foundopt; memset(&configuration, 0, sizeof(struct config_opts)); /* set all options to 'unset' state */ while ((foundopt = getopt_long(argc, argv, shortopts, long_options, NULL)) != -1) { switch (foundopt) { case 'a': if (configuration.mode) { fputs(TXT_ERR_MULTMODES, stderr); return CODE_FAILURE; } configuration.mode = MODE_ALL; break; case 'b': if (configuration.mode) { fputs(TXT_ERR_MULTMODES, stderr); return CODE_FAILURE; } configuration.mode = MODE_BAD; break; case 'c': configuration.config_file = optarg; break; case 'd': if (configuration.def_act) { fputs(TXT_ERR_MULTACTIONS, stderr); return CODE_FAILURE; } configuration.def_act = ACTION_DELETE; break; case 'e': excode = EXCODE_ACTED; /* instead of default CODE_OK */ break; case 'g': if (configuration.mode) { fputs(TXT_ERR_MULTMODES, stderr); return CODE_FAILURE; } configuration.mode = MODE_GOOD; break; case 'h': printf(PACKAGE_STRING "\n" COPYRIGHT "\n\n"); printf(TXT_ERR_USAGE); printf(TXT_HELP_A); printf(TXT_HELP_B); printf(TXT_HELP_C); printf(TXT_HELP_D); printf(TXT_HELP_E); printf(TXT_HELP_G); printf(TXT_HELP_H); printf(TXT_HELP_K); printf(TXT_HELP_L); printf(TXT_HELP_P); printf(TXT_HELP_R); printf(TXT_HELP_S); printf(TXT_HELP_V1); printf(TXT_HELP_V2); return CODE_OK; break; case 'k': if (configuration.def_act) { fputs(TXT_ERR_MULTACTIONS, stderr); return CODE_FAILURE; } configuration.def_act = ACTION_KILL; break; case 'l': loopguard = 1; break; case 'r': if (configuration.def_act) { fputs(TXT_ERR_MULTACTIONS, stderr); return CODE_FAILURE; } configuration.def_act = ACTION_RENAME; break; case 'p': { /* The pipe command is everything else on the command line, as is */ int argnum = 0; configuration.pipe_cmd = (char**)calloc(argc, sizeof(char*)); for (optind--; optind 0 */ int skip_encoded = 0; /* 0=no effect on message 1=waiting for blank line 2=skipping lines while waiting for blank line/boundary 3=skipping lines while waiting for uuencode 'end' */ sprintf(uuscanspec, UUENC_START "%%*d %%%d[^\r\n]", MAXFIELD-1); memset(&m_attachment, 0, sizeof(struct attach)); memset(&u_attachment, 0, sizeof(struct attach)); init_zip(&zipstate); memset(messageid, 0, sizeof(messageid)); /* Read line at a time from input */ while (fgets(linebuf, sizeof(linebuf), stdin)) { if (onheaders && ((*linebuf == '\n') || (*linebuf == '\r')) ) { onheaders = 0; /* Watch for end of message headers, if using delete_exe or kill_exe features */ if ((configuration.delete_exe == OPTION_ENABLED) || (configuration.kill_exe == OPTION_ENABLED)) sigcheckcount = 10; /* check binary signatures on next few lines */ } /* Record message-id for logging purposes */ if (onheaders && (strncasecmp(linebuf, HEAD_MESSAGEID, sizeof(HEAD_MESSAGEID)-1)==0)) strncpy(messageid, linebuf, sizeof(messageid)-1); /* Remove Delivered-To from headers to prevent spammer's mail forwarding loop trick */ if (onheaders && loopguard && (strncasecmp(linebuf, HEAD_DELIVERED_TO, sizeof(HEAD_DELIVERED_TO)-1)==0)) { configuration.action = ACTION_SKIP; taking_action(TXT_DELIVEREDTO); continue; } /* First check for UUencode begin line */ if ( (strncmp(linebuf, UUENC_START, sizeof(UUENC_START)-1)==0) && (sscanf(linebuf, uuscanspec, u_attachment.cd_fname.name)==1) ) { /* Found a uuencoded attachment, and parsed its filename to the structure. Note that unlike MIME, there are no details, and filtering can be done NOW */ if ((configuration.delete_exe==OPTION_ENABLED) || (configuration.kill_exe==OPTION_ENABLED)) sigcheckcount = 5; /* check binary signatures on next few lines */ if (filter_decision(&u_attachment)) { if (configuration.action == ACTION_DELETE) { skip_encoded = 3; /* skip body lines until 'end' is seen */ sigcheckcount = 0; /* don't bother checking; already deleting */ } taking_action(u_attachment.curspec->oldname); } /* filter_decision has made sure curspec points to good data, so write fresh */ fprintf(dest, UUENC_START "600 %s\n", u_attachment.curspec->name); memset(&u_attachment, 0, sizeof(struct attach)); continue; /* Important; we need to drop old begin line */ } else if (is_line_mime(linebuf, on_mime, &m_attachment)) /* also parses attach values */ { if (!on_mime) { /* just entered a MIME header block */ on_mime = 1; last_mime_pos = ftell(dest); /* note stream pos for possible overwriting */ if (last_mime_pos == -1) return 0; /* ftell error, can't continue */ } } else if (on_mime) { /* Now past end of MIME headers. Decision time, "do we do anything?" */ on_mime = 0; if ((configuration.delete_exe==OPTION_ENABLED) || (configuration.kill_exe==OPTION_ENABLED)) sigcheckcount = 10; /* check binary signatures on next few lines */ if (m_attachment.fattach) { /* There was an attached file. We will write the MIME header fresh. The call to filter_decision ensures that curspec points to safe or now-safe data, which should be rewritten. */ char nameout[MAXFIELD]; /* the (possibly re-encoded) name to write out */ if (filter_decision(&m_attachment)) { if (configuration.action == ACTION_DELETE) { skip_encoded = 1; /* once we find blank line, start skipping */ sigcheckcount = 0; /* don't bother checking; already deleting */ } taking_action(m_attachment.curspec->oldname); } if (fseek(dest, last_mime_pos, SEEK_SET) != 0) return 0; /* fseek error, can't continue */ /* Write fresh MIME header; filter_decision modified dangerous parts */ if (*m_attachment.content_type) { if (reencode_name(m_attachment.curspec, "\tname", nameout) != 0) sprintf(nameout, "\tname=\"%s\"", configuration.generic_name); fprintf(dest, MIME_CTYPE " %s;\n%s\n", m_attachment.content_type, nameout); } if (reencode_name(m_attachment.curspec, "\tfilename", nameout) != 0) sprintf(nameout, "\tfilename=\"%s\"", configuration.generic_name); fprintf(dest, MIME_CDISP " attachment;\n%s\n", nameout); if (*m_attachment.content_enc) fprintf(dest, MIME_CTENC " %s\n", m_attachment.content_enc); /* If user wants to pass Content-ID, add back that header unfiltered */ if ((configuration.pass_contentid == OPTION_ENABLED) && *m_attachment.content_id) fprintf(dest, MIME_CNTID " %s\n", m_attachment.content_id); } memset(&m_attachment, 0, sizeof(struct attach)); } /* Check for encoded executable signatures (delete_exe, kill_exe) */ if (sigcheckcount > 0) { sigcheckcount--; if ( (strncmp(linebuf, B64_EXESIG1, 3) == 0) || (strncmp(linebuf, B64_EXESIG2, 3) == 0) || (strncmp(linebuf, B64_EXESIG3, 3) == 0) || (strncmp(linebuf, B64_EXESIG4, 3) == 0) ) { if (configuration.kill_exe == OPTION_ENABLED) { configuration.action = ACTION_KILL; kill_exit(TXT_ENCODEDBODY); /* kill email and exit */ } skip_encoded = 2; configuration.action = ACTION_DELETE; exe_count++; taking_action(TXT_ENCODEDBODY); } else if ( (strncmp(linebuf+1, UUE_EXESIG1, 3) == 0) || (strncmp(linebuf+1, UUE_EXESIG2, 3) == 0) || (strncmp(linebuf+1, UUE_EXESIG3, 3) == 0) || (strncmp(linebuf+1, UUE_EXESIG4, 3) == 0) ) { if (configuration.kill_exe == OPTION_ENABLED) { configuration.action = ACTION_KILL; kill_exit(TXT_ENCODEDBODY); /* kill email and exit */ } skip_encoded = 3; configuration.action = ACTION_DELETE; exe_count++; taking_action(TXT_ENCODEDBODY); } } /* Check for filenames inside ZIPs. Any filenames found inside are subject to the standard goodlist/badlist tests and deleted or killed, except that NOTHING IS DONE IF CURRENT ACTION IS 'RENAME' (dummy action) */ if (configuration.search_zip == OPTION_ENABLED) { int decoded; char textbuf[MAXLINEBUF], binbuf[MAXLINEBUF]; strncpy(textbuf, linebuf, sizeof(textbuf)); trim_trailch(textbuf, '\r', '\n', ' '); if (*textbuf == 0) init_zip(&zipstate); else if( (skip_encoded<2) && (decoded=base64_decode_line(textbuf, binbuf)) ) { char* zip_pos = binbuf; int available = decoded; while ((zip_pos=unzip_filename(zip_pos, available, &zipstate))) { /* Found a filename inside ZIP archive. Synthesize struct attach */ struct attach inzip; memset(&inzip, 0, sizeof(struct attach)); inzip.within = 1; strncpy(inzip.ct_fname.name, zipstate.filename, sizeof(inzip.ct_fname.name)); if (filter_decision(&inzip)) { if (configuration.action == ACTION_DELETE) { skip_encoded = 2; /* skip rest of attachment */ taking_action(zipstate.filename); } else not_taking_action(TXT_INFO_CANTRENZIP, zipstate.filename); } available = (binbuf+decoded) - zip_pos; } } } if ( (skip_encoded==1) && ((*linebuf == '\n')||(*linebuf == '\r')) ) skip_encoded = 2; /* now we're actually skipping body lines */ else if (skip_encoded == 2) /* Encoded body lines will be skipped if 'deleting' an attachment. */ { if ( (*linebuf == '\n') || (*linebuf == '\r') || (strncmp(linebuf, "--", 2)==0) ) skip_encoded = 0; else continue; } else if (skip_encoded == 3) /* Body lines skipped until uuencode 'end' is seen */ { if (strncmp(linebuf, UUENC_END, sizeof(UUENC_END)-1) == 0) skip_encoded = 0; else continue; } /* Write (non-skipped) lines to dest; some may be overwritten if we fseek back */ if (fputs(linebuf, dest) == EOF) return 0; /* fputs error, can't continue */ } return 1; } /* This header modification pass doesn't do any actual filtering. The previously filtered mail is read back from source, and some headers are added and modified before writing to destination (stdout or pipe). A warning message (warning_text and/or warning_html) may also be added. source is file handle to temporary file Returns nonzero on success, zero on failure */ int header_pass(FILE* source) { char linebuf[MAXLINEBUF]; long endpos; int onheaders = 1; int subject_changed = 0; int plain_part = 0; int html_part = 0; int plain_warning = (configuration.warning_text && *configuration.warning_text); int html_warning = (configuration.warning_html && *configuration.warning_html); FILE* dest = stdout; pid_t pid; if (plain_warning) plain_part = 1; /* Stream data may have been overwritten, so we need to set new end of file */ endpos = ftell(source); if (endpos == -1) return 0; /* ftell error, can't continue */ rewind(source); if (ftruncate(fileno(source), endpos) != 0) return 0; /* ftruncate error, can't continue */ if (fflush(source) != 0) return 0; /* fflush error, can't continue */ /* Open output destination pipe, if requested */ if (configuration.pipe_cmd) { dest = openpipe(configuration.pipe_cmd, &pid); if (dest == NULL) { fprintf(stderr, TXT_ERR_OPENPIPE ": %s\n", configuration.pipe_cmd[0]); return 0; /* error opening pipe */ } signal(SIGPIPE, abnormalproc); /* establish signal handler for pipe error */ } while (fgets(linebuf, sizeof(linebuf), source)) { /* Reached blank line */ if ((*linebuf == '\n') || (*linebuf == '\r')) { /* If we were still on headers, then append our new headers */ if (onheaders) { onheaders = 0; fprintf(dest, "X-Filtered-With: %s\n", PACKAGE_STRING); fprintf(dest, "X-RenAttach-Info: "TXT_HEAD_MODE"=%s " TXT_HEAD_ACTION"=%s " \ TXT_HEAD_FILTCOUNT"=%d", mode2str(configuration.mode), act2str(configuration.action), filtcount); if (filtcount) { fprintf(dest, " (%s)\n", TXT_HEAD_FILTERED); if (!subject_changed) explain_subject(dest, NULL); /* add new Subject */ } else fprintf(dest, "\n"); /* If filtering occurred and there are custom headers, add them */ if (filtcount && configuration.add_header && *configuration.add_header) fprintf(dest, "%s\n", configuration.add_header); } /* We've reached start of body part, insert warning if desired */ if (filtcount && plain_part) { fprintf(dest, "\n%s\n", configuration.warning_text); plain_part = 0; } else if (filtcount && html_part) { fprintf(dest, "\n"); if (position_html(source, dest) != 0) return 0; /* error during seeking */ fprintf(dest, "%s", configuration.warning_html); fgets(linebuf, sizeof(linebuf), source); /* because source shifted */ html_part = 0; } } /* Processing of message headers */ if (onheaders) { /* Modify subject if required */ if (filtcount && (strncasecmp(linebuf, HEAD_SUBJECT, sizeof(HEAD_SUBJECT)-1)==0)) { subject_changed = 1; if (explain_subject(dest, linebuf+sizeof(HEAD_SUBJECT)-1)) continue; } /* Keep existing X- headers specific to RenAttach, by renaming as Old- */ if ( (strncasecmp(linebuf, HEAD_FILTERED_WITH, sizeof(HEAD_FILTERED_WITH)-1)==0) || (strncasecmp(linebuf, HEAD_FILTERED_INFO, sizeof(HEAD_FILTERED_INFO)-1)==0) ) { fprintf(dest, "Old-%s", linebuf); continue; } } /* If warning_text or warning_html is enabled, search for next parts */ if (plain_warning && (strncasecmp(linebuf, MIME_TYPETEXT, sizeof(MIME_TYPETEXT)-1) == 0)) { plain_part = 1; html_part = 0; } else if (html_warning && (strncasecmp(linebuf, MIME_TYPEHTML, sizeof(MIME_TYPEHTML)-1) == 0)) { plain_part = 0; html_part = 1; } if (fputs(linebuf, dest) == EOF) return 0; /* fputs error */ } /* Make sure output gets written */ if (dest != stdout) { int retcode = -1; if (closepipe(dest, pid, &retcode) != 0) fprintf(stderr, TXT_ERR_CLOSEPIPE ": %s\n", configuration.pipe_cmd[0]); if (verbose) fprintf(stderr, "%s: 0x%X\n", TXT_INFO_PIPEXITCODE, retcode); if (retcode != 0) /* by convention, nonzero exitcode indicates error condition */ return 0; /* header pass failed due to pipe error */ } return 1; } /* For any given line (considering the 'on_mime' boolean state) returns false (zero) if line does not indicate MIME presence, and true (nonzero) if line indicates MIME presence. In the process of seeking MIME data, the m_attachment structure is filled in with any parsed values. */ int is_line_mime(const char* line, int on_mime, struct attach* m_attachment) { const char* orgline = line; int found_mime = 0; /* Is there something worth trying to parse? */ if (on_mime && ((*line == '\t') || (*line == ' ')) ) found_mime = 1; else if ( (strncasecmp(line, MIME_CTYPE, sizeof(MIME_CTYPE)-1) == 0) || (strncasecmp(line, MIME_CTENC, sizeof(MIME_CTENC)-1) == 0) || (strncasecmp(line, MIME_CDISP, sizeof(MIME_CDISP)-1) == 0) || (strncasecmp(line, MIME_CNTID, sizeof(MIME_CNTID)-1) == 0) || (strncasecmp(line, MIME_CDESC, sizeof(MIME_CDESC)-1) == 0) ) found_mime = 1; if (found_mime) { int parsed_name = 0; /* flag, was name parsed? */ char* nameloc = stristr(line, MIME_NAME); /* case-insensitive search */ /* MIME_NAME should be before the first '=' sign */ if (nameloc >= strchr(line, '=')) nameloc = NULL; if (strncasecmp(line, MIME_CTYPE, sizeof(MIME_CTYPE)-1) == 0) { /* Trying to parse content type */ char scanspec[MAXFIELD]; sprintf(scanspec, "%%%d[^;\r\n\t]", MAXFIELD-1); /* generate safe scanf spec */ if (sscanf(line+sizeof(MIME_CTYPE)-1, scanspec, m_attachment->content_type) == 1) { trim_leading(m_attachment->content_type); trim_trailing(m_attachment->content_type); } m_attachment->curspec = &m_attachment->ct_fname; } else if (strncasecmp(line, MIME_CDISP, sizeof(MIME_CDISP)-1) == 0) { m_attachment->curspec = &m_attachment->cd_fname; } else if (strncasecmp(line, MIME_CTENC, sizeof(MIME_CTENC)-1) == 0) { /* Trying to parse content transfer encoding */ char scanspec[MAXFIELD]; sprintf(scanspec, "%%%d[^;\r\n\t]", MAXFIELD-1); /* generate safe scanf spec */ if (sscanf(line+sizeof(MIME_CTENC)-1, scanspec, m_attachment->content_enc) == 1) { trim_leading(m_attachment->content_enc); trim_trailing(m_attachment->content_enc); } } else if (strncasecmp(line, MIME_CNTID, sizeof(MIME_CNTID)-1) == 0) { /* Trying to parse Content-ID */ char scanspec[MAXFIELD]; sprintf(scanspec, "%%%d[^;\r\n\t]", MAXFIELD-1); /* generate safe scanf spec */ if (sscanf(line+sizeof(MIME_CNTID)-1, scanspec, m_attachment->content_id) == 1) { trim_leading(m_attachment->content_id); trim_trailing(m_attachment->content_id); } } /* Now hunt for filenames! */ while (m_attachment->curspec && nameloc) { char parsed[MAXFIELD]; char scanspec1[MAXFIELD], scanspec2[MAXFIELD], scanspec3[MAXFIELD], scanspec4[MAXFIELD]; /* Strong suspicion that this is a file attachment, even if later parsing fails */ m_attachment->fattach = 1; /* renattach must rewrite a fresh MIME header */ line = nameloc + sizeof(MIME_NAME); /* advance pointer for next search */ /* Check for extension; RFC 2231 fields */ if (strncasecmp(nameloc, MIME_NAMEX, sizeof(MIME_NAMEX)-1) == 0) { m_attachment->curspec->specformat = FMT_RFC2231; /* Check to see if field carries charset/lang info */ if (strstr(nameloc, "*=")) m_attachment->curspec->langinfo = 1; } sprintf(scanspec1, "%%*[ *0-9]%%*[ =]\"%%%d[^\r\n\"]", MAXFIELD-1); sprintf(scanspec2, "%%*[ *0-9]%%*[ =]%%%d[^\r\n\";]", MAXFIELD-1); sprintf(scanspec3, "%%*[ =]\"%%%d[^\r\n\"]", MAXFIELD-1); sprintf(scanspec4, "%%*[ =]%%%d[^\r\n\";]", MAXFIELD-1); if ( (sscanf(nameloc+sizeof(MIME_NAME)-1, scanspec1, parsed) == 1) || (sscanf(nameloc+sizeof(MIME_NAME)-1, scanspec2, parsed) == 1) || (sscanf(nameloc+sizeof(MIME_NAME)-1, scanspec3, parsed) == 1) || (sscanf(nameloc+sizeof(MIME_NAME)-1, scanspec4, parsed) == 1) ) { int remaining; parsed_name = 1; line += strlen(parsed); /* further advance pointer for next search */ if (m_attachment->curspec->specformat == FMT_RFC2231) decode_hex(parsed, '%', 0, NULL); else if ((strstr(parsed, "=?") || strstr(parsed, "?=")) && (decode_2047(parsed, m_attachment->curspec)==0) ) m_attachment->curspec->specformat = FMT_RFC2047; else { trim_leading(parsed); trim_trailing(parsed); } remaining = MAXFIELD - strlen(m_attachment->curspec->name) - 1; strncat(m_attachment->curspec->name, parsed, remaining); } /* Prepare for next iteration */ nameloc = stristr(line, MIME_NAME); /* case-insensitive search */ } /* Might have encountered (obsolete format) line continuation on encoded filename */ if (!parsed_name && m_attachment->curspec && (m_attachment->curspec->specformat == FMT_RFC2047)) { char parsed[MAXFIELD], scanspec[MAXFIELD]; sprintf(scanspec, "%%*[\t ]%%%d[^\r\n\"]", MAXFIELD-1); if ((sscanf(orgline, scanspec, parsed)==1) && (decode_2047(parsed, m_attachment->curspec)==0)) { int remaining = MAXFIELD - strlen(m_attachment->curspec->name) - 1; strncat(m_attachment->curspec->name, parsed, remaining); } } } return found_mime; } /* By checking each parsed filename, determined whether filter action is necessary. If a filename is deemed dangerous, substitutions are performed. m_attach->curspec will point to namespec that MUST be used for everything after! (this is the namespec that is known to be safe for rewriting) m_attach->curspec will point to valid data, but the name may still be blank Returns zero if no filter action Returns nonzero if filter action */ int filter_decision(struct attach* m_attach) { char* dotsearch; /* remove padding whitespace, and trailing periods */ trim_leading(m_attach->ct_fname.name); trim_trailch(m_attach->ct_fname.name, '\t', ' ', '.'); trim_leading(m_attach->cd_fname.name); trim_trailch(m_attach->cd_fname.name, '\t', ' ', '.'); /* See if either of the parsed filenames gets caught by filter */ if (match_filename(m_attach->ct_fname.name, m_attach->within)) m_attach->curspec = &m_attach->ct_fname; else if (match_filename(m_attach->cd_fname.name, m_attach->within)) m_attach->curspec = &m_attach->cd_fname; else { /* Nothing to filter. Point curspec toward preferred field */ if (*(m_attach->cd_fname.name)) m_attach->curspec = &m_attach->cd_fname; else m_attach->curspec = &m_attach->ct_fname; return 0; /* nothing to filter */ } /* Caught a filename! Record the original filename */ strcpy(m_attach->curspec->oldname, m_attach->curspec->name); if (configuration.action == ACTION_KILL) kill_exit(m_attach->curspec->oldname); /* absorbs email, and exits */ if (configuration.full_rename == OPTION_ENABLED) { /* Full rename replaces all periods with underscores (safest) */ for (dotsearch = m_attach->curspec->name; *dotsearch; dotsearch++) { if (*dotsearch == '.') *dotsearch = '_'; } } else { /* Partial rename just replaces final period with underscore */ dotsearch = strrchr(m_attach->curspec->name, '.'); if (dotsearch) *dotsearch = '_'; } /* underscores alone make extension safe Also tack on new extension if there is enough buffer space */ /* bhoc@pentagroup.ch : if new_exension is "#" then do nothing */ if (strcmp(configuration.new_extension, "#") != 0) { if (1 + strlen(m_attach->curspec->name) + strlen(configuration.new_extension) < sizeof(m_attach->curspec->name)) { strcat(m_attach->curspec->name, "."); strcat(m_attach->curspec->name, configuration.new_extension); } } /* Replace the Content-Type, since that is now suspicious */ strcpy(m_attach->content_type, configuration.new_mime_type); return 1; /* this MIME attachment was filtered */ } /* Does this filename match (by whatever the current criteria are) Provide flag if filename was found inside zip returns 0 - do not act (file poses no risk) returns 1 - do act, something should be done to this file */ int match_filename(const char* filename, int inzip) { char extension[MAXFIELD]; char *lastdot, *listcopy, *token; if (*filename == '\0') return 0; /* don't act (even if MODE_ALL); no file name */ if (configuration.mode == MODE_ALL) return 1; /* do act, regardless */ /* If there is a banned_files list, we must check it first */ if (configuration.banned_files && tokenize_list(configuration.banned_files, 0)) { listcopy = malloc(strlen(configuration.banned_files) + 1); strcpy(listcopy, configuration.banned_files); token = strtok(listcopy, LIST_TOKENS); while (token) { int action=0, submatch=0; char* actswitch; if (*token == '/') { submatch = 1; /* match substring instead of exact */ token++; } actswitch = strchr(token, '/'); /* see if action is specified */ if (actswitch) { switch (actswitch[1]) { case 'r': case 'R': action = ACTION_RENAME; break; case 'd': case 'D': action = ACTION_DELETE; break; case 'k': case 'K': action = ACTION_KILL; break; } *actswitch = '\0'; /* drop the action specification */ } /* Now see if we have found a banned file name */ if ((submatch && stristr(filename, token)) || (strcasecmp(filename, token)==0)) { ban_count++; if (action) /* if provided, use specific action */ configuration.action = action; /* reset by filter_action() */ free(listcopy); return 1; } token = strtok(NULL, LIST_TOKENS); } free(listcopy); } lastdot = strrchr(filename, '.'); if (!lastdot || lastdot[1] == '\0') return 0; /* don't act; no file extension */ memset(extension, 0, sizeof(extension)); strncpy(extension, lastdot+1, sizeof(extension)-1); trim_leading(extension); trim_trailing(extension); /* We now have a cleaned up file extension to compare */ if (configuration.mode == MODE_BAD) { /* do badlist comparison */ listcopy = malloc(strlen(configuration.badlist) + 1); strcpy(listcopy, configuration.badlist); token = strtok(listcopy, LIST_TOKENS); while (token) { int action=0; /* use default action, unless overridden */ char *switchar, *actswitch, *inswitch = NULL; actswitch = strchr(token, '/'); /* see if action is specified */ if (actswitch) inswitch = strchr(actswitch+1, '/'); if (inzip && inswitch) /* if specific action found for inside ZIP */ switchar = inswitch; /* use that action */ else switchar = actswitch; /* otherwise, use first action found */ if (switchar) { switch (switchar[1]) /* select specific action */ { case 'r': case 'R': action = ACTION_RENAME; break; case 'd': case 'D': action = ACTION_DELETE; break; case 'k': case 'K': action = ACTION_KILL; break; } } if (actswitch) *actswitch = '\0'; /* terminate string at first switch */ if (strcasecmp(token, extension) == 0) { if (action) /* if provided, use specific action */ configuration.action = action; /* reset by filter_action() */ free(listcopy); return 1; /* file extension is on badlist */ } token = strtok(NULL, LIST_TOKENS); } free(listcopy); return 0; /* file extension is NOT on badlist */ } else if (configuration.mode == MODE_GOOD) { /* do goodlist comparison */ listcopy = malloc(strlen(configuration.goodlist) + 1); strcpy(listcopy, configuration.goodlist); token = strtok(listcopy, LIST_TOKENS); while (token) { if (strcasecmp(token, extension) == 0) { free(listcopy); return 0; /* file extension is on goodlist */ } token = strtok(NULL, LIST_TOKENS); } free(listcopy); return 1; /* file extension is NOT on goodlist */ } else return 1; /* should never be reached */ } /* Attempts to decode an RFC-2047 encoded field Fills in information about fieldspec Returns 0 if successful, nonzero otherwise */ int decode_2047(char* field, struct namespec* fieldspec) { char scanspec[MAXFIELD]; char* result; /* result of decoding */ int pos; /* position marker */ int field_len; /* length of field */ int improper; /* flag set if improper coding found */ int valid = 0; /* flag set when valid coding found */ int state = 0; /* 0 = normal 1 = just inside encoded word 2 = found pre-encoding ? */ sprintf(scanspec, "=?%%%d[^?]", MAXFIELD-1); improper = 0; field_len = strlen(field); result = calloc(field_len+1, 1); for (pos=0; ( pos0) && (field[pos]==' ') ) { improper = 1; break; } switch(state) { case 0: /* Make a note of the character encoding */ if ( (sscanf(field+pos, scanspec, fieldspec->charenc) == 1) || (sscanf(field+pos, scanspec+1, fieldspec->charenc) == 1) ) { valid = 1; state++; pos++; } else sprintf(result+strlen(result), "%c", field[pos]); break; case 1: if (field[pos] == '?') state++; break; case 2: if (strncasecmp(field+pos, "Q?", 2) == 0) state = 3; else if (strncasecmp(field+pos, "B?", 2) == 0) state = 4; else improper = 1; if (state > 2) { char* termin; pos += 2; /* skip past encoding field */ termin = strstr(field+pos, "?="); if (!termin) improper = 1; else { int whitesp = 0; *termin = 0; /* end here, for now */ if (state == 3) { fieldspec->charmode = 'Q'; decode_hex(field+pos, '=', 1, result+strlen(result)); } else { fieldspec->charmode = 'B'; base64_decode_line(field+pos, result+strlen(result)); } *termin = '?'; /* put back old char */ pos = termin - field + 2; while ((field[pos]==' ') || (field[pos]=='\t')) { whitesp = 1; pos++; /* delay printing whitespace */ } if (whitesp && (strncmp(field+pos, "=?", 2) != 0)) strcat(result, " "); if (pos > 0) pos--; /* loop fixup */ state = 0; } } break; default: improper = 1; } } if (improper || !valid) { free(result); *field = 0; /* clear the invalid field */ return 1; } else { strcpy(field, result); /* result is always shorter than original */ free(result); return 0; } } /* Re-encode a filename back to its original encoding format. The details of the format are supplied by struct namespec. reencode_name recreates the original format as close to spec as possible, storing the output (including MIME tags based on tagbase) to result, assume to hold MAXFIELD Returns 0 if all went well, and result contains the encoded form result may contain intermediate newlines, but no terminating newline Returns nonzero on failure (buffer filled, corrupt coding...) */ int reencode_name(struct namespec* fieldspec, const char* tagbase, char* result) { int namelen = strlen(fieldspec->name); if (namelen == 0) return 1; /* empty argument */ memset(result, 0, MAXFIELD); /* clear result */ if (fieldspec->specformat == FMT_PLAIN) { /* Simple case, no encoding required */ if (strlen(tagbase)+3+namelen < MAXFIELD) { sprintf(result, "%s=\"%s\"", tagbase, fieldspec->name); return 0; /* success */ } else return 1; /* insufficient buffer space */ } else if (fieldspec->specformat == FMT_RFC2047) { int remain = MAXFIELD - strlen(tagbase) - 4 - strlen(fieldspec->charenc) - 3; if (remain <= 1) return 1; /* insufficient buffer space */ sprintf(result, "%s=\"=?%s?%c?", tagbase, fieldspec->charenc, fieldspec->charmode); if (fieldspec->charmode == 'B') /* going to base64 convert */ { remain -= (1+namelen/3)*4; if (remain <= 1) return 1; /* failure */ base64_encode_line(fieldspec->name, namelen, result+strlen(result)); } else /* quoted printable encoding */ { int pos; remain -= 3*namelen; /* worst case */ if (remain <= 1) return 1; /* failure */ for (pos=0; posname[pos]) || (fieldspec->name[pos] == '.') || (fieldspec->name[pos] == '-') || (fieldspec->name[pos] == '!') || (fieldspec->name[pos] == ':') || (fieldspec->name[pos] == '\\') ) { sprintf(result+strlen(result), "%c", fieldspec->name[pos]); } else if (fieldspec->name[pos] == ' ') strcat(result, "_"); /* nice space */ else { sprintf(result+strlen(result), "=%02X", (unsigned char)fieldspec->name[pos]); } } } remain -= 3; if (remain <= 1) return 1; /* failure */ strcat(result, "?=\""); return 0; /* success */ } else if (fieldspec->specformat == FMT_RFC2231) { int pos, remain, linecount = 0; int linelen = 0; /* output line length */ int singquote = 0; /* count two single quotes (relevant when langinfo exists) */ if (fieldspec->langinfo) sprintf(result, "%s*%u*=", tagbase, linecount++); else sprintf(result, "%s*%u=\"", tagbase, linecount++); remain = MAXFIELD - strlen(result); /* Write characters out, folding lines and encoding as necessary */ for (pos=0; pos 50) { linelen = 0; remain -= strlen(tagbase) + 10; /* for tag we're about to write */ if (remain <= 1) return 1; /* failure */ /* Fold, begin new line */ if (fieldspec->langinfo) sprintf(result+strlen(result), ";\n%s*%u*=", tagbase, linecount++); else sprintf(result+strlen(result), "\";\n%s*%u=\"", tagbase, linecount++); } /* Write character directly without coding if: there's no language info, or character is alpha numeric, or we're delaying encoding until single quotes */ if (!fieldspec->langinfo || isalnum((int)fieldspec->name[pos]) || (singquote<2)) { if (fieldspec->name[pos] == '\'') singquote++; linelen++; remain--; if (remain <= 1) return 1; /* failure */ sprintf(result+strlen(result), "%c", fieldspec->name[pos]); } else { /* Encoding is required... write 3 characters */ linelen += 3; remain -= 3; if (remain <= 1) return 1; /* failure */ sprintf(result+strlen(result), "%%%02X", (unsigned char)fieldspec->name[pos]); } } /* If we were writing without encoding (no langinfo) then terminate quotes */ if (!fieldspec->langinfo) { remain--; if (remain <= 1) return 1; /* failure */ strcat(result, "\""); } return 0; /* success */ } else { /* That's strange, there's a flag we don't recognize */ return 1; } } /* This function finds the "right place" (based on htmlwarn_pos from .conf file) to insert warning_html. The current source_pos is recorded, then source is read through in search of all htmlwarn_pos tags. Once the source_htmlspot is found, the region from source_pos to source_htmlpos is written to dest. When the function returns, dest points to the correct spot to output the warning_html. Returns 0 on success, nonzero if seeking fails */ int position_html(FILE* source, FILE* dest) { char* tag = NULL; char linebuf[MAXFIELD]; char taglist[MAXFIELD]; long dump_size; long source_start, source_htmlspot; source_start = ftell(source); if (source_start == -1) return -1; source_htmlspot = source_start; strcpy(taglist, configuration.htmlwarn_pos); tag = strtok(taglist, LIST_TOKENS); while (tag && fgets(linebuf, sizeof(linebuf), source)) { char *tagstart, *tagend; char fulltag[MAXFIELD]; sprintf(fulltag, "<%s", tag); if ((tagstart = stristr(linebuf, fulltag)) && (tagend = strchr(tagstart, '>'))) { /* Located one more tag, note the best spot found so far */ source_htmlspot = ftell(source); if (source_htmlspot == -1) return -1; source_htmlspot = source_htmlspot - strlen(linebuf) + (tagend - linebuf) + 1; if (fseek(source, source_htmlspot, SEEK_SET) != 0) /* backtrack for next fgets */ return -1; tag = strtok(NULL, LIST_TOKENS); } if (strncasecmp(linebuf, MIME_CTYPE, sizeof(MIME_CTYPE)-1) == 0) break; } /* Either advanced through all tags (ideal) or reached end of source */ if (fseek(source, source_start, SEEK_SET) != 0) return -1; dump_size = source_htmlspot - source_start; if (dump_size > 0) { char* dump_buf = calloc(1, 1+dump_size); if (!dump_buf) return -1; if (fread(dump_buf, dump_size, 1, source) < 1) return -1; fprintf(dest, "%s", dump_buf); free(dump_buf); } return 0; } /* Kill this email and exit the program, taking_action along the way */ void kill_exit(const char* text) { /* To properly absorb email, read stdin to completion */ char linebuf[MAXLINEBUF]; taking_action(text); while (fgets(linebuf, sizeof(linebuf), stdin)) ; exit(excode); /* if --excode used, indicates filtering happened */ } /* Called whenever taking some kind of filtering action (the type: configuration.action) Responsible for counting filtering, logging NOTE that this function resets configuration.action -- call it AFTER handling */ void taking_action(const char* caughtfile) { if (verbose) fprintf(stderr, "%s \"%s\" in %s", act2str(configuration.action), caughtfile, messageid); if (configuration.use_syslog == OPTION_ENABLED) { #ifdef HAVE_SYSLOG_H openlog("renattach", LOG_PID, LOG_MAIL); syslog(LOG_WARNING, "%s \"%s\" in %s", act2str(configuration.action), caughtfile, messageid); closelog(); #endif } /* Update filter counters (but not in case of ACTION_SKIP) */ if (configuration.action != ACTION_SKIP) filtcount++; if (configuration.action == ACTION_DELETE) del_count++; else if (configuration.action == ACTION_RENAME) ren_count++; /* Reset to default action */ configuration.action = configuration.def_act; } /* Called when NOT acting upon filename; logs warning As with taking_action, this resets configuration.action */ void not_taking_action(const char* reason, const char* missedfile) { if (verbose) fprintf(stderr, TXT_INFO_NOTACTING " - %s: %s\n", reason, missedfile); if (configuration.use_syslog == OPTION_ENABLED) { #ifdef HAVE_SYSLOG_H openlog("renattach", LOG_PID, LOG_MAIL); syslog(LOG_WARNING, TXT_INFO_NOTACTING " - %s: %s", reason, missedfile); closelog(); #endif } /* Reset to default action */ configuration.action = configuration.def_act; } /* Explain filtering by writing a new Subject field to dest oldsubject may be NULL (if adding an entirely new Subject field) Returns 0 if nothing written ('#' rule suppressed output) Returns nonzero if new subject has been written */ int explain_subject(FILE* dest, char* oldsubject) { char* therest = "\n"; if (oldsubject) therest = oldsubject; if (ban_count && *configuration.subj_banned) { if (strcmp(configuration.subj_banned, "#") == 0) return 0; else fprintf(dest, HEAD_SUBJECT " %s%s", configuration.subj_banned, therest); } else if (exe_count && *configuration.subj_exec) { if (strcmp(configuration.subj_exec, "#") == 0) return 0; else fprintf(dest, HEAD_SUBJECT " %s%s", configuration.subj_exec, therest); } else if (del_count && *configuration.subj_deleted) { if (strcmp(configuration.subj_deleted, "#") == 0) return 0; else fprintf(dest, HEAD_SUBJECT " %s%s", configuration.subj_deleted, therest); } else if (ren_count && *configuration.subj_renamed) { if (strcmp(configuration.subj_renamed, "#") == 0) return 0; else fprintf(dest, HEAD_SUBJECT " %s%s", configuration.subj_renamed, therest); } else if (filtcount && *configuration.add_subject) { if (strcmp(configuration.add_subject, "#") == 0) return 0; else fprintf(dest, HEAD_SUBJECT " %s%s", configuration.add_subject, therest); } else return 0; return 1; } /* SIGPIPE signal handler; clean up tempfile, exit */ void abnormalproc(int sig) { if (tempfile) fclose(tempfile); fprintf(stderr, TXT_INFO_SIGPIPE "\n"); exit(CODE_TEMPFAIL); /* temporary failure */ } /* Opens a write-pipe to indicated command, where args[0] is program childpid receives the child's process ID, required for closepipe() Returns FILE* for writing to on success Returns NULL if pipe/fork/exec fails, or program terminates prematurely */ FILE* openpipe(char** args, pid_t* childpid) { FILE* command; int cmdpipe[2]; if (pipe(cmdpipe) != 0) return NULL; switch (*childpid = fork()) { case -1: /* error */ close(cmdpipe[0]); close(cmdpipe[1]); return NULL; case 0: /* child */ if (dup2(cmdpipe[0], STDIN_FILENO) == -1) _exit(-1); close(cmdpipe[0]); close(cmdpipe[1]); execv(args[0], args); fprintf(stderr, TXT_ERR_EXEC ": %s\n", args[0]); _exit(-1); default: /* parent */ close(cmdpipe[0]); /* close unused pipe end */ command = fdopen(cmdpipe[1], "w"); /* open write-side of pipe */ if (command) return command; else { close(cmdpipe[1]); return NULL; } } } /* Close the write-pipe opened earlier with openpipe() Returns 0 on normal termination, exitcode filled in Otherwise returns nonzero value, exitcode unmodified */ int closepipe(FILE* command, pid_t childpid, int* exitcode) { int status; if (fclose(command) != 0) { waitpid(childpid, &status, 0); /* cleanup any way */ return -1; /* error closing stream/pipe */ } if (waitpid(childpid, &status, 0) == -1) return -1; /* error waiting for child */ if (WIFEXITED(status)) { *exitcode = WEXITSTATUS(status); return 0; /* terminated normally */ } else return -1; /* abnormal termination or nonzero exit code */ } renattach-1.2.4/src/settings.c0000644000175000001440000002557110517503244011752 /* renattach 1.2.4 - Filter that renames/deletes dangerous email attachments Copyright (C) 2003-2006 Jem E. Berkes This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "config.h" #include "renattach.h" #include "strings-en.h" #include "utility.h" #include #include #include #include #ifndef HAVE_STRCASECMP #define strcasecmp stricmp #endif #ifndef HAVE_STRNCASECMP #define strncasecmp strnicmp #endif /* Iterates through the list and returns the number of entries within. If verbose is specified, each entry is displayed. */ int tokenize_list(const char* thelist, int verbose) { char *tmpbuf, *token; int count=0; tmpbuf = malloc(strlen(thelist) + 1); strcpy(tmpbuf, thelist); token = strtok(tmpbuf, LIST_TOKENS); while (token) { if (verbose) { if (count) fprintf(stderr, "|%s", token); else fprintf(stderr, "%s", token); } count++; token = strtok(NULL, LIST_TOKENS); } free(tmpbuf); return count; } /* Parse the configuration file and fill in the options structure Any errors found are written to stderr. Returns CODE_OK or CODE_FAILURE */ int parse_conf(struct config_opts* options) { int linecount = 0; char confline[MAXFIELD]; char directive[MAXFIELD], parameter[MAXFIELD]; FILE* config = NULL; if (options->config_file == NULL) { fprintf(stderr, TXT_INFO_CONFIGFILE TXT_INFO_UNDEF "\n"); return CODE_FAILURE; } config = fopen(options->config_file, "r"); if (!config) { perror(options->config_file); return CODE_FAILURE; } while (fgets(confline, sizeof(confline), config)) { int syntax_error = 0; linecount++; trim_leading(confline); trim_trailing(confline); if ((*confline == '#') || (*confline == '\r') || (*confline == '\n')) continue; if (sscanf(confline, "%[^\t =]%*[\t =]%[^\r\n]", directive, parameter) == 2) { int state = OPTION_UNSET; if ( (strncasecmp(parameter, TAG_OPTENABLED, strlen(TAG_OPTENABLED))==0) || (*parameter=='1')) /* 'yes' or 1 */ state = OPTION_ENABLED; else if ( (strncasecmp(parameter, TAG_OPTDISABLED, strlen(TAG_OPTDISABLED))==0) || (*parameter=='0')) /* 'no' or 0 */ state = OPTION_DISABLED; if ((strcasecmp(directive, TAG_DELETE_EXE)==0) && state) options->delete_exe = state; else if ((strcasecmp(directive, TAG_KILL_EXE)==0) && state) options->kill_exe = state; else if ((strcasecmp(directive, TAG_SEARCH_ZIP)==0) && state) options->search_zip = state; else if ((strcasecmp(directive, TAG_PASS_CONTENTID)==0) && state) options->pass_contentid = state; else if ((strcasecmp(directive, TAG_FULL_RENAME)==0) && state) options->full_rename = state; else if ((strcasecmp(directive, TAG_USE_SYSLOG)==0) && state) options->use_syslog = state; else if (strcasecmp(directive, TAG_GENERIC_NAME) == 0) strcpy(options->generic_name, parameter); else if (strcasecmp(directive, TAG_NEW_EXTENSION) == 0) strcpy(options->new_extension, parameter); else if (strcasecmp(directive, TAG_NEW_MIME_TYPE) == 0) strcpy(options->new_mime_type, parameter); else if (strcasecmp(directive, TAG_SUBJ_BANNED) == 0) strcpy(options->subj_banned, parameter); else if (strcasecmp(directive, TAG_SUBJ_EXEC) == 0) strcpy(options->subj_exec, parameter); else if (strcasecmp(directive, TAG_SUBJ_DELETED) == 0) strcpy(options->subj_deleted, parameter); else if (strcasecmp(directive, TAG_SUBJ_RENAMED) == 0) strcpy(options->subj_renamed, parameter); else if (strcasecmp(directive, TAG_ADD_SUBJECT) == 0) strcpy(options->add_subject, parameter); else if (strcasecmp(directive, TAG_HTMLWARN_POS) == 0) strcpy(options->htmlwarn_pos, parameter); else if (strcasecmp(directive, TAG_WARNING_TEXT) == 0) expand_list(&options->warning_text, parameter, "\n"); else if (strcasecmp(directive, TAG_WARNING_HTML) == 0) expand_list(&options->warning_html, parameter, "\n"); else if (strcasecmp(directive, TAG_ADD_HEADER) == 0) expand_list(&options->add_header, parameter, "\n"); else if (strcasecmp(directive, TAG_BANNED_FILES) == 0) expand_list(&options->banned_files, parameter, "\n"); else if (strcasecmp(directive, TAG_BADLIST) == 0) expand_list(&options->badlist, parameter, "\n"); else if (strcasecmp(directive, TAG_GOODLIST) == 0) expand_list(&options->goodlist, parameter, "\n"); else syntax_error = 1; } else syntax_error = 1; if (syntax_error) { fprintf(stderr, TXT_ERR_CONFSYNTAX "%d: %s\n", linecount, confline); fclose(config); return CODE_FAILURE; } } fclose(config); return CODE_OK; } /* Check all configuration directives If any are unset, use defaults */ void directive_defaults(struct config_opts* options) { if (options->delete_exe == OPTION_UNSET) options->delete_exe = DEF_DELETE_EXE; if (options->kill_exe == OPTION_UNSET) options->kill_exe = DEF_KILL_EXE; if (options->search_zip == OPTION_UNSET) options->search_zip = DEF_SEARCH_ZIP; if (options->pass_contentid == OPTION_UNSET) options->pass_contentid = DEF_PASS_CONTENTID; if (options->full_rename == OPTION_UNSET) options->full_rename = DEF_FULL_RENAME; if (options->use_syslog == OPTION_UNSET) options->use_syslog = DEF_USE_SYSLOG; if (options->generic_name[0] == '\0') strcpy(options->generic_name, DEF_GENERIC_NAME); if (options->new_extension[0] == '\0') strcpy(options->new_extension, DEF_NEW_EXTENSION); if (options->new_mime_type[0] == '\0') strcpy(options->new_mime_type, DEF_NEW_MIME_TYPE); if (options->subj_banned[0] == '\0') strcpy(options->subj_banned, DEF_SUBJ_BANNED); if (options->subj_exec[0] == '\0') strcpy(options->subj_exec, DEF_SUBJ_EXEC); if (options->subj_deleted[0] == '\0') strcpy(options->subj_deleted, DEF_SUBJ_DELETED); if (options->subj_renamed[0] == '\0') strcpy(options->subj_renamed, DEF_SUBJ_RENAMED); if (options->add_subject[0] == '\0') strcpy(options->add_subject, DEF_ADD_SUBJECT); if (options->htmlwarn_pos[0] == '\0') strcpy(options->htmlwarn_pos, DEF_HTMLWARN_POS); if ( (options->warning_text == NULL) || (options->warning_text[0] == '\0')) expand_list(&options->warning_text, DEF_WARNING_TEXT, "\n"); if ( (options->warning_html == NULL) || (options->warning_html[0] == '\0')) expand_list(&options->warning_html, DEF_WARNING_HTML, "\n"); if ( (options->add_header == NULL) || (options->add_header[0] == '\0')) expand_list(&options->add_header, DEF_ADD_HEADER, "\n"); if ( (options->banned_files == NULL) || (tokenize_list(options->banned_files, 0)==0) ) expand_list(&options->banned_files, DEF_BANNED_FILES, "\n"); if ( (options->goodlist == NULL) || (tokenize_list(options->goodlist, 0)==0) ) expand_list(&options->goodlist, DEF_GOODLIST, "\n"); if ( (options->badlist == NULL) || (tokenize_list(options->badlist, 0)==0) ) expand_list(&options->badlist, DEF_BADLIST, "\n"); } /* Show current configuration; used in verbose mode */ void show_configuration(struct config_opts* options) { /* Where is our configuration file? */ fprintf(stderr, TXT_INFO_CONFIGFILE "\n "); if (options->config_file) fprintf(stderr, "%s\n", options->config_file); else fprintf(stderr, TXT_INFO_UNDEF "\n"); fprintf(stderr, TXT_INFO_OUTPUT "\n "); if (options->pipe_cmd) { int arg = 0; fprintf(stderr, "{"); while (options->pipe_cmd[arg]) { if (arg) fprintf(stderr, "|"); fprintf(stderr, "%s", options->pipe_cmd[arg++]); } fprintf(stderr, "}\n"); } else fprintf(stderr, TXT_INFO_STDOUT "\n"); /* What filtering mode are we using? */ fprintf(stderr, TXT_INFO_MODE "\n %s\n", mode2str(options->mode)); /* What filtering action are we using? */ fprintf(stderr, TXT_INFO_ACTION "\n %s\n", act2str(options->action)); fprintf(stderr, TXT_INFO_CONFOPTS "\n"); /* Show status of all settings from renattach.conf */ fprintf(stderr, " "TAG_DELETE_EXE ": %s\n", opt2str(options->delete_exe)); fprintf(stderr, " "TAG_KILL_EXE ": %s\n", opt2str(options->kill_exe)); fprintf(stderr, " "TAG_SEARCH_ZIP ": %s\n", opt2str(options->search_zip)); fprintf(stderr, " "TAG_PASS_CONTENTID ": %s\n", opt2str(options->pass_contentid)); fprintf(stderr, " "TAG_FULL_RENAME ": %s\n", opt2str(options->full_rename)); fprintf(stderr, " "TAG_USE_SYSLOG ": %s\n", opt2str(options->use_syslog)); fprintf(stderr, " "TAG_GENERIC_NAME ": \"%s\"\n", options->generic_name); fprintf(stderr, " "TAG_NEW_EXTENSION ": \"%s\"\n", options->new_extension); fprintf(stderr, " "TAG_NEW_MIME_TYPE ": \"%s\"\n", options->new_mime_type); fprintf(stderr, " "TAG_SUBJ_BANNED ": \"%s\"\n", options->subj_banned); fprintf(stderr, " "TAG_SUBJ_EXEC ": \"%s\"\n", options->subj_exec); fprintf(stderr, " "TAG_SUBJ_DELETED ": \"%s\"\n", options->subj_deleted); fprintf(stderr, " "TAG_SUBJ_RENAMED ": \"%s\"\n", options->subj_renamed); fprintf(stderr, " "TAG_ADD_SUBJECT ": \"%s\"\n", options->add_subject); fprintf(stderr, " "TAG_HTMLWARN_POS ": \"%s\"\n", options->htmlwarn_pos); fprintf(stderr, " "TAG_WARNING_TEXT ": %d bytes,\n%s\n", (int)strlen(options->warning_text), options->warning_text); fprintf(stderr, " "TAG_WARNING_HTML ": %d bytes,\n%s\n", (int)strlen(options->warning_html), options->warning_html); fprintf(stderr, " "TAG_ADD_HEADER ": %d bytes,\n%s\n", (int)strlen(options->add_header), options->add_header); fprintf(stderr, " "TAG_BANNED_FILES ": {"); tokenize_list(options->banned_files, 1); fprintf(stderr, "}\n "TAG_BADLIST ": {"); tokenize_list(options->badlist, 1); fprintf(stderr, "}\n " TAG_GOODLIST ": {"); tokenize_list(options->goodlist, 1); fprintf(stderr, "}\n"); } /* Return description of directive state */ const char* opt2str(int state) { if (state == OPTION_DISABLED) return TAG_OPTDISABLED; else if (state == OPTION_ENABLED) return TAG_OPTENABLED; else return TXT_INFO_UNDEF; } /* Return description of filter mode */ const char* mode2str(int mode) { if (mode == MODE_ALL) return TXT_INFO_MODEALL; else if (mode == MODE_BAD) return TXT_INFO_MODEBAD; else if (mode == MODE_GOOD) return TXT_INFO_MODEGOOD; else return TXT_INFO_UNDEF; } /* Return description of action type */ const char* act2str(int action) { switch (action) { case ACTION_RENAME: return TAG_ACTRENAME; case ACTION_DELETE: return TAG_ACTDELETE; case ACTION_KILL: return TAG_ACTKILL; case ACTION_SKIP: return TAG_ACTSKIP; default: return TXT_INFO_UNDEF; } } renattach-1.2.4/src/utility.c0000644000175000001440000002352110130672360011603 /* renattach 1.2.2 - Filter that renames/deletes dangerous email attachments Copyright (C) 2003, 2004 Jem E. Berkes This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include #include #include #include #include "utility.h" /* Used by base64 routines */ const static char alphabet[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"; /* Trim leading whitespace from a line */ void trim_leading(char* buf) { int i, len = strlen(buf); char *tmpbuf = calloc(len+1, 1); for (i=0; i=buf && (*end==' ' || *end=='\t')) { *end = 0; end--; } } /* Trims specified trailing character from a line */ void trim_trailch(char* buf, char ch1, char ch2, char ch3) { char* end = buf+strlen(buf)-1; while (end>=buf && (*end==ch1 || *end==ch2 || *end==ch3)) { *end = 0; end--; } } /* Expand the specified dynamic list with the additional text If adding to existing, the new addition is delimited by the given string */ void expand_list(char** buffer, const char* addition, const char* delim) { char* newbuf; if (*buffer) { newbuf = malloc(strlen(*buffer) + strlen(delim) + strlen(addition) + 1); strcpy(newbuf, *buffer); strcat(newbuf, delim); } else newbuf = calloc(strlen(addition) + 1, 1); strcat(newbuf, addition); if (*buffer) free(*buffer); *buffer = newbuf; } /* Case-insensitive version of strstr Searches for needle within haystack, returning pointer to start of the matching characters in haystack. */ char* stristr(const char* haystack, const char* needle) { const char* needlepoint = needle; const char* matchpoint = NULL; if (!haystack || !needle) /* check for bad input */ return NULL; else if (*needle == '\0') /* strstr compliance */ return (char*)haystack; while (*haystack != '\0') { if (tolower(*needlepoint) == tolower(*haystack)) { if (!matchpoint) matchpoint = haystack; needlepoint++; if (*needlepoint == '\0') return (char*)matchpoint; } else if (matchpoint) { /* reset the search */ needlepoint = needle; haystack = matchpoint; /* cure overlap problem */ matchpoint = NULL; } haystack++; } return NULL; } /* Return integer (byte) equivalent of hexadecimal octet from ASCII form */ unsigned char hex2int(char* hexform) { int pos; unsigned char value = 0; for (pos=0; pos<=1; pos++) { unsigned char nibble = (unsigned char)hexform[pos]; if ((nibble >= '0') && (nibble <= '9')) nibble -= '0'; else if ((nibble >= 'a') && (nibble <= 'f')) nibble -= ('a' - 10); else if ((nibble >= 'A') && (nibble <= 'F')) nibble -= ('A' - 10); else return value; value = (value << 4) | nibble; } return value; } /* Decode quoted printable (or URL-style) encoding where 8-bit characters are represented by hexadecimal octet. e.g. Hello%20world%2E Specify the hexflag character Set underscore=1 if underscores should be converted to spaces (RFC 2047) optdest is optional; if NULL, the input text is replaced */ void decode_hex(char* text, char hexflag, int underscore, char* optdest) { int pos, inlen = strlen(text); char* tmpbuf = calloc(inlen+1, 1); for (pos=0; pos < inlen; pos++) { if (underscore && (text[pos]=='_')) strcat(tmpbuf, " "); else if ((text[pos]==hexflag) && (pos+2> 2; outfour[1] = ((inthree[0]<<4) & 0x30) | (inthree[1]>>4); outfour[2] = (inthree[1]<<2) & 0x3F; outfour[0] = alphabet[outfour[0]]; outfour[1] = alphabet[outfour[1]]; outfour[2] = alphabet[outfour[2]]; outfour[3] = '='; memcpy(output+(4*i), outfour, 4); i++; } memcpy(output+(4*i), "\0", 1); } /* You must initialize the zip_info structure before first use */ void init_zip(struct zip_info* zip) { memset(zip, 0, sizeof(struct zip_info)); zip->offset = -1; } /* Search for and extract filenames from ZIP archives. databuf is the input chunk of binary ZIP data, of databuf_len zip_info is the context, and must have been initialized Returns: NULL No filename found in this data block ptr Filename found. Repeat call with this pointer to continue processing this data block after you grab the filename. */ char* unzip_filename(char* databuf, int databuf_len, struct zip_info* zip) { char* databuf_pos; /* Position within databuf */ char* databuf_end; /* Byte past end of databuf */ /* Sanity checking */ if (!databuf || !zip) return NULL; if (databuf_len < 1) return NULL; databuf_pos = databuf; databuf_end = databuf + databuf_len; while (databuf_pos < databuf_end) { /* Maybe we're skipping compresed data until next file */ if (zip->skipping) { if (zip->skipcount == 0) init_zip(zip); /* Clears skipping flag too */ else { databuf_pos++; zip->skipcount--; } continue; } if (zip->offset < 0) /* haven't yet found first ID byte */ { void* id0 = memchr(databuf_pos, 0x50, databuf_end-databuf_pos); if (id0) { zip->offset = 0; /* found 0x50, offset 0 ok */ databuf_pos = (char*)id0+1; continue; } else return NULL; /* no hope in this particular data block */ } if (zip->offset < 3) { char needid = 0; switch (zip->offset) { case 0: needid = 0x4b; break; case 1: needid = 0x03; break; case 2: needid = 0x04; break; } if (*databuf_pos == needid) zip->offset++; else zip->offset = -1; databuf_pos++; continue; } zip->offset++; if (zip->offset == 0x12) zip->skipcount = (unsigned char)*databuf_pos; else if (zip->offset == 0x13) zip->skipcount |= ((unsigned char)*databuf_pos) << 8; else if (zip->offset == 0x14) zip->skipcount |= ((unsigned char)*databuf_pos) << 16; else if (zip->offset == 0x15) zip->skipcount |= ((unsigned char)*databuf_pos) << 24; else if (zip->offset == 0x1a) zip->namelen = (unsigned char)*databuf_pos; else if (zip->offset == 0x1b) { zip->namelen |= ((unsigned char)*databuf_pos) << 8; /* Bounds checking */ if ((zip->namelen + 1) > sizeof(zip->filename)) zip->namelen = sizeof(zip->filename) - 1; } else if (zip->offset == 0x1c) zip->skipcount += (unsigned char)*databuf_pos; else if (zip->offset == 0x1d) { zip->skipcount += ((unsigned char)*databuf_pos) << 8; if (zip->skipcount > MAX_ZIPBYTES) /* Exceeded reasonable size */ { init_zip(zip); /* Likely corrupt, reset state*/ continue; } } else if (zip->offset >= 0x1e) { /* Transfer bytes of filename until end is reached */ if ((zip->offset - 0x1e) >= zip->namelen) { /* Next time, we'll start skipping bytes */ zip->skipping = 1; return databuf_pos; /* Done */ } zip->filename[zip->offset - 0x1e] = *databuf_pos; } databuf_pos++; } return NULL; } renattach-1.2.4/src/renattach.h0000644000175000001440000001606410517502713012065 /* Return codes */ #define CODE_OK 0 #define EXCODE_ACTED 77 /* filtering happened, only used if --excode */ #define CODE_TEMPFAIL 75 /* temporary failure, as per EX_TEMPFAIL from sysexits.h */ #define CODE_FAILURE 255 /* critical failure */ /* States for yes/no options loaded from CONF_FILE */ #define OPTION_UNSET 0 /* this MUST be 0 */ #define OPTION_DISABLED 1 #define OPTION_ENABLED 2 /* FILTER MODES. Values MUST be nonzero. */ #define MODE_ALL 1 #define MODE_BAD 2 #define MODE_GOOD 3 /* FILTER ACTIONS. Values MUST be nonzero. */ #define ACTION_RENAME 1 #define ACTION_DELETE 2 #define ACTION_KILL 3 #define ACTION_SKIP 4 #define MAXLINEBUF 1000 /* As per RFC, mail line buffer size, including \n and \0 */ #define MAXFIELD 512 #define CONF_FILE "renattach.conf" #define LIST_TOKENS "\t, \n" #define TAG_OPTENABLED "yes" #define TAG_OPTDISABLED "no" #define TAG_ACTRENAME "rename" #define TAG_ACTDELETE "delete" #define TAG_ACTKILL "kill" #define TAG_ACTSKIP "skip" /* Executable signatures: 'MZ' in base64 and uuencoded form base64: compare to bytes 0-2 on line uuencode: compare to bytes 1-3 on line (skip byte 0, length code) */ #define B64_EXESIG1 "TVo" #define B64_EXESIG2 "TVp" #define B64_EXESIG3 "TVq" #define B64_EXESIG4 "TVr" #define UUE_EXESIG1 "35H" #define UUE_EXESIG2 "35I" #define UUE_EXESIG3 "35J" #define UUE_EXESIG4 "35K" #define COPYRIGHT "Copyright (C) 2003-2006 Jem E. Berkes" /* Configuration directives you would find in .conf file Defaults are given in the next set of defines */ #define TAG_DELETE_EXE "delete_exe" /* delete executable binary attachments, when detected */ #define TAG_KILL_EXE "kill_exe" /* (mutually exclusive) kill executable binary attachments */ #define TAG_SEARCH_ZIP "search_zip" /* search for file names inside ZIP archives */ #define TAG_PASS_CONTENTID "pass_contentid" /* pass MIME Content-ID through, unmodified */ #define TAG_FULL_RENAME "full_rename" /* replace all periods during rename if enabled (safer) */ #define TAG_USE_SYSLOG "use_syslog" /* use syslog feature */ #define TAG_GENERIC_NAME "generic_name" /* filename to use when parsing fails (corrupt, blank) */ #define TAG_NEW_EXTENSION "new_extension" /* use this new file extension when modifying */ #define TAG_NEW_MIME_TYPE "new_mime_type" /* use this MIME content-type when modifying */ #define TAG_SUBJ_BANNED "subj_banned" /* (highest precedence) subject text when file is banned */ #define TAG_SUBJ_EXEC "subj_exec" /* subject text when executable file is caught */ #define TAG_SUBJ_DELETED "subj_deleted" /* subject text when attachment is deleted */ #define TAG_SUBJ_RENAMED "subj_renamed" /* subject text when attachment is renamed */ #define TAG_ADD_SUBJECT "add_subject" /* (lowest precedence) subject text when filtering occurs */ #define TAG_HTMLWARN_POS "htmlwarn_pos" /* series of HTML tags defining position for warning_html */ #define TAG_WARNING_TEXT "warning_text" /* (additive) plain text warning to insert when filtered */ #define TAG_WARNING_HTML "warning_html" /* (additive) HTML markup warning to insert when filtered */ #define TAG_ADD_HEADER "add_header" /* (additive) new headers to add when filtering occurs */ #define TAG_BANNED_FILES "banned_files" /* (additive) specifically banned files, with actions */ #define TAG_GOODLIST "goodlist" /* (additive) list of safe/good file extensions */ #define TAG_BADLIST "badlist" /* (additive) list of dangerous/bad file extensions */ /* Default configuration directives */ #define DEF_DELETE_EXE OPTION_ENABLED #define DEF_KILL_EXE OPTION_DISABLED #define DEF_SEARCH_ZIP OPTION_DISABLED #define DEF_PASS_CONTENTID OPTION_DISABLED #define DEF_FULL_RENAME OPTION_ENABLED #define DEF_USE_SYSLOG OPTION_DISABLED #define DEF_GENERIC_NAME "filename" #define DEF_NEW_EXTENSION "bad" #define DEF_NEW_MIME_TYPE "application/unknown" #define DEF_SUBJ_BANNED "" #define DEF_SUBJ_EXEC "" #define DEF_SUBJ_DELETED "" #define DEF_SUBJ_RENAMED "" #define DEF_ADD_SUBJECT "[filtered]" #define DEF_HTMLWARN_POS "html, body" #define DEF_WARNING_TEXT "" #define DEF_WARNING_HTML "" #define DEF_ADD_HEADER "" #define DEF_BANNED_FILES "" #define DEF_GOODLIST "DOC, PDF, RTF, SXC, SXW, TXT, ZIP" #define DEF_BADLIST "ADE, ADP, BAS, BAT, CHM, CMD, COM, CPL, CRT, EML, EXE, "\ "HLP, HTA, HTM, HTML, INF, INS, ISP, JS, JSE, LNK, MDB, "\ "MDE, MSC, MSH, MSI, MSP, MST, NWS, OCX, PCD, PIF, REG, "\ "SCR, SCT, SHB, SHS, URL, VB, VBE, VBS, WSC, WSF, WSH" #define MIME_CTYPE "Content-Type:" #define MIME_TYPETEXT "Content-Type: text/plain" #define MIME_TYPEHTML "Content-Type: text/html" #define MIME_CTENC "Content-Transfer-Encoding:" #define MIME_CDISP "Content-Disposition:" #define MIME_CNTID "Content-ID:" #define MIME_CDESC "Content-Description:" #define MIME_NAME "name" #define MIME_NAMEX "name*" #define UUENC_START "begin " #define UUENC_END "end" #define HEAD_FILTERED_WITH "X-Filtered-With:" #define HEAD_FILTERED_INFO "X-RenAttach-Info:" #define HEAD_SUBJECT "Subject:" #define HEAD_MESSAGEID "Message-ID:" #define HEAD_DELIVERED_TO "Delivered-To:" #define FMT_PLAIN 0 #define FMT_RFC2047 1 #define FMT_RFC2231 2 /* These details tell us what we need to know in order to rewrite a MIME header after seeing an attached file */ struct namespec { char name[MAXFIELD]; /* decoded form */ char oldname[MAXFIELD]; /* the name before we changed it */ int specformat; /* name specification format, FMT_ */ int langinfo; /* (if specformat==FMT_RFC2231), is there lang info? */ char charenc[MAXFIELD]; /* (if specformat==FMT_RFC2047), character encoding */ char charmode; /* (if specformat==FMT_RFC2047), mode B or Q */ }; struct attach { int fattach; /* if nonzero this is a file attachment */ int within; /* if nonzero the file was found within (ZIP) */ char content_type[MAXFIELD]; /* the content type found */ char content_enc[MAXFIELD]; /* content transfer encoding */ char content_id[MAXFIELD]; /* content ID field */ struct namespec* curspec; /* current namespec */ struct namespec ct_fname; /* content type namespec */ struct namespec cd_fname; /* content disposition namespec */ }; struct config_opts { char* config_file; /* Configuration file name */ char** pipe_cmd; /* command/args to pipe output to */ int mode; /* Filtering mode */ int def_act; /* Default action */ int action; /* Current action (may differ from def_act) */ int delete_exe; int kill_exe; int search_zip; int pass_contentid; int full_rename; int use_syslog; char generic_name[MAXFIELD]; char new_extension[MAXFIELD]; char new_mime_type[MAXFIELD]; char subj_banned[MAXFIELD]; char subj_exec[MAXFIELD]; char subj_deleted[MAXFIELD]; char subj_renamed[MAXFIELD]; char add_subject[MAXFIELD]; char htmlwarn_pos[MAXFIELD]; char* warning_text; char* warning_html; char* add_header; char* banned_files; char* goodlist; char* badlist; }; const char* opt2str(int state); const char* mode2str(int mode); const char* act2str(int action); int tokenize_list(const char* thelist, int verbose); int parse_conf(struct config_opts* options); void directive_defaults(struct config_opts* options); void show_configuration(struct config_opts* options); renattach-1.2.4/src/strings-en.h0000644000175000001440000000643710517512242012206 #define TXT_ERR_USAGE "Usage: renattach [OPTIONS]\n\n" #define TXT_HELP_HINT "Try `renattach --help' for more options\n" #define TXT_WARN_DEFAULTS "Warning: using defaults in absence of " #define TXT_ERR_CONFSYNTAX "Configuration file syntax error, line " #define TXT_ERR_MULTMODES "You cannot specify multiple filter modes\n" #define TXT_ERR_MULTACTIONS "You cannot specify multiple filter actions\n" #define TXT_ERR_EXEC "Error executing pipe command" #define TXT_ERR_OPENPIPE "Error opening pipe command" #define TXT_ERR_CLOSEPIPE "Error closing pipe command" #define TXT_INFO_UNDEF "undefined" #define TXT_INFO_MODE "Filter mode: " #define TXT_INFO_MODEALL "all" #define TXT_INFO_MODEBAD "badlist" #define TXT_INFO_MODEGOOD "goodlist" #define TXT_INFO_ACTION "Filter action: " #define TXT_INFO_CONFIGFILE "Configuration file: " #define TXT_INFO_OUTPUT "Writing output to: " #define TXT_INFO_STDOUT "stdout" #define TXT_INFO_PIPEXITCODE "pipe command exitcode" #define TXT_INFO_SIGPIPE "Caught SIGPIPE; pipe stopped accepting data" #define TXT_INFO_CONFOPTS "Configuration directives:" #define TXT_INFO_NOTACTING "WARNING: Not acting on file" #define TXT_INFO_CANTRENZIP "Can't rename inside ZIP" #define TXT_HEAD_MODE "mode" #define TXT_HEAD_ACTION "action" #define TXT_HEAD_FILTCOUNT "count" #define TXT_HEAD_FILTERED "filtered" #define TXT_ENCODEDBODY "[encoded attachment body]" #define TXT_DELIVEREDTO "[forged Delivered-To header]" #define TXT_HELP_A " -a, --all\n" \ " Filter mode: Match all attachments.\n\n" #define TXT_HELP_B " -b, --badlist\n" \ " Filter mode: Only match filenames that have extensions listed on the\n" \ " bad-list. This will match only attachments with known dangerous file\n" \ " extensions (default).\n\n" #define TXT_HELP_C " -c, --config filename\n" \ " Use the specified configuration file. Run renattach with --settings\n" \ " to verify current settings.\n\n" #define TXT_HELP_D " -d, --delete\n" \ " Filter action: Delete attachment body after renaming headers.\n\n" #define TXT_HELP_E " -e, --excode\n" \ " Extend exitcodes: 77=filtering occurred. This is in addition to the\n" \ " default codes: 0=success, 75=temporary failure, 255=critical failure\n\n" #define TXT_HELP_G " -g, --goodlist\n" \ " Filter mode: Match all attachments except those that have extensions\n" \ " listed on the goodlist.\n\n" #define TXT_HELP_H " -h, --help\n" \ " Show help, explain options.\n\n" #define TXT_HELP_K " -k, --kill\n" \ " Filter action: Kill (absorb) entire email.\n\n" #define TXT_HELP_L " -l, --loop\n" \ " Remove Delivered-To headers to prevent malicious mail forwarding loop.\n\n" #define TXT_HELP_P " -p, --pipe command [args]\n" \ " Instead of writing output to stdout, open pipe to command (with args)\n" \ " and send output there. This program must return with exit code 0.\n" \ " This must be the last option on the command line.\n\n" #define TXT_HELP_R " -r, --rename\n" \ " Filter action: Rename matching attachments (default).\n\n" #define TXT_HELP_S " -s, --settings\n" \ " Show current settings/configuration and terminate.\n\n" #define TXT_HELP_V1 " -v, --verbose\n" \ " Write verbose output (including settings) to stderr.\n\n" #define TXT_HELP_V2 " -V, --version\n" \ " Display software version and terminate.\n\n" renattach-1.2.4/src/utility.h0000644000175000001440000000157510041327313011611 #define MAX_ZIPBYTES 0x03000000 /* Arbitrary max reasonable size, detecting corrupt */ struct zip_info { int offset; int skipping; /* Flag */ unsigned int skipcount; /* Counter for bytes skipped after filename */ unsigned int namelen; /* Length of filename */ char filename[512]; }; void trim_leading(char* buf); void trim_trailing(char* buf); void trim_trailch(char* buf, char ch1, char ch2, char ch3); void expand_list(char** buffer, const char* addition, const char* delim); char* stristr(const char* haystack, const char* needle); unsigned char hex2int(char* hexform); void decode_hex(char* text, char hexflag, int underscore, char* optdest); int base64_decode_line(const char* input, char* dest); void base64_encode_line(const char* input, int insize, char* output); void init_zip(struct zip_info* zip); char* unzip_filename(char* databuf, int databuf_len, struct zip_info* zip); renattach-1.2.4/conf/0000777000175000001440000000000010517521266010162 5renattach-1.2.4/conf/renattach.conf.ex0000644000175000001440000001700410233262443013325 # renattach 1.2.3 recognizes the following configuration directives. # Delete executable binary attachments by signature. renattach looks # for encoded bytes that identify DOS/Windows executables ('MZ'). # If an executable is found, the encoded attachment will be removed # while the MIME header remains unchanged. This is a feature that # works independently of filename-based filtering, designed as a # backup. The net effect is that encoded executables are deleted. # Specify yes or no, or alternatively 1 or 0 # # delete_exe = yes # Kill executable binary attachments by signature, as in the previous # directive. Note that delete_exe and kill_exe are mutually exclusive. # # kill_exe = no # Search for filenames within ZIP archives using the internal ZIP # parsing engine (no external software required). Any filenames found # are subject to the same checks, for instance badlist or goodlist, # with the notable difference that the RENAME ACTION HAS NO EFFECT on # ZIP files. Only the delete or kill actions will modify ZIP files. # # search_zip = no # Normally, MIME Content-ID fields are dropped during filtering due # to their application-specific use and security risk (recently used # by worms to link malicious code to embedded images). If you are sure # you want to pass Content-ID fields unfiltered, enable this option. # # pass_contentid = no # Normally, all periods in filenames are replaced with underscores # during renaming. Although this is the recommended mode, you can # also disable full renaming if you only want the last period to be # changed to an underscore. # # full_rename = yes # If enabled, all filtering actions will be logged via syslog. # renattach logs with priority 'warning' to facility 'mail' # # use_syslog = no # A generic filename to use when parsing fails. Since renattach # rewrites all attachment headers, it's possible that corruption, # lack of buffer space, or some other problem will prevent filenames # from being recreated. In such a case, this generic name is used. # # generic_name = filename # A replacement file extension to use when changing dangerous # attachment filenames. This extension is appended to the previous # one. For instance virus.pif becomes virus_pif.bad # Specify just # to leave the extension as is, and not rename it. # # new_extension = bad # When attachments are renamed, the MIME type is also changed to # this new_mime_type for safety. # # new_mime_type = application/unknown # The following directives control how the message Subject is # modified to inform the user that filtering has occurred. They # have the following ORDER OF PRIORITY (starting with highest): # subj_banned, subj_exec, subj_deleted, subj_renamed, add_subject # By default, only add_subject is defined so any condition (whether # it's a ban, executable match, delete, or rename) results in the # same Subject addition. If you also define subj_exec then there # could be a different Subject if an executable was caught (since # it has higher priority than add_subject). Another alternative for # these options is to specify the single character # to suppress # Subject modification for that condition. You could use this to be # quiet in case a banned attachment is caught. You can also use # to # turn off add_subject, hence NEVER modify the message Subject. # Add text to Subject if an attachment is caught by banned_files, # shown here in suppression mode to NOT inform user on file ban. # # subj_banned = # # Add text to Subject if an attachment is caught by delete_exe # # subj_exec = [removed executable] # Add text to Subject if an attachment is deleted for any reason # # subj_deleted = [deleted attachment] # Add text to Subject if an attachment is renamed for any reason # # subj_renamed = [renamed attachment] # Add text to Subject if an attachment is filtered in any way. This # has lowest priority, and is only used if previous are undefined. # Use single character # to suppress addition to Subject. # # add_subject = [filtered] # When inserting a warning into HTML parts of messages (warning_html), # this tag defines the preferred position to insert the new HTML. If # the first tag in the list is found, the warning position is placed # just after this tag. As subsequent tags are found, the position # advances after each. # # htmlwarn_pos = html, body # If an attachment is filtered, this lets you specify some warning # text that will be inserted into any plain text portion(s) of the # email. This is effective for informing users of filtered files, # but the act of inserting arbitrary text into an email can cause # new problems. Use with caution. # # warning_text = ******************* # warning_text = MAIL SYSTEM WARNING # warning_text = Attachments removed # warning_text = ******************* # Inserts a warning message into HTML portions of the email when # filtering occurs. The HTML is inserted at a position determined by # htmlwarn_pos (see above) which provides a good hope for adding a # visible warning. Unfortunately, inserting arbitrary HTML is tricky # due to the complexity of markup interactions. Inserting warnings in # HTML may thoroughly disrupt the original message, so use with caution. # # warning_html =

Mail system warning

# warning_html =

Attachments removed

# When enabled, these new headers will be added to the message to # inform the user about filtering that occurred. # # add_header = X-Filtered-0: *** PLEASE NOTE *** # add_header = X-Filtered-1: Potentially dangerous attachments have been # add_header = X-Filtered-2: found in this e-mail, and have either been # add_header = X-Filtered-3: renamed or deleted for your safety. # Catch specifically named, banned attachment filenames and # optionally take an action (r=rename, d=delete, k=kill). This is # an additive option so there is no limit to how many names can be # specified. If the name begins with a forward slash ('/'), this # substring has to be found; '/foo' matches 'foobar' and 'eatfoo' # Otherwise, the whole name has to match. Specify case-insensitive # filenames separated by commas. To specify an action on matching # filename, append /r (rename), /d (delete), or /k (kill) to the # filename as illustrated in the example. # # banned_files = your_details.zip/r, your_details.pif/k # banned_files = movie.pif/d, movie.zip, /winmail/d # A list of good (known-safe) attachment file extensions to use # in goodlist filtering mode. This is an additive option, so there # is no limit to how many filenames can be specified. Specify case- # insensitive extensions separated by commas. # # goodlist = DOC, PDF, RTF, SXC, SXW, TXT, ZIP # A list of bad (known-dangerous) attachment file extensions to use # in badlist filtering mode. This is an additive option, so there # is no limit to how many filenames can be specified. Specify case- # insensitive extensions separated by commas. To specify an action # for an extension, append /r (rename), /d (delete), or /k (kill) # to the filename. This overrides the default action for the filter # and can be used to provide special handling for some extensions. # An additional switch can be used to specify an action only for # files found within ZIP archives. For instance, EXE/k/d tells the # filter to kill emails containing EXE attachments, but if the EXE # was found inside a ZIP then the attachment is deleted, not killed. # # badlist = ADE, ADP, BAS, BAT, CHM, CMD, COM, CPL, CRT, EML, EXE # badlist = HLP, HTA, HTM, HTML, INF, INS, ISP, JS, JSE, LNK, MDB # badlist = MDE, MSC, MSH, MSI, MSP, MST, NWS, OCX, PCD, PIF, REG # badlist = SCR, SCT, SHB, SHS, URL, VB, VBE, VBS, WSC, WSF, WSH renattach-1.2.4/conf/Makefile.am0000644000175000001440000000004607746402044012134 dist_sysconf_DATA = renattach.conf.ex renattach-1.2.4/conf/Makefile.in0000644000175000001440000002055510517513654012154 # Makefile.in generated by automake 1.8.5 from Makefile.am. # @configure_input@ # Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, # 2003, 2004 Free Software Foundation, Inc. # This Makefile.in is free software; the Free Software Foundation # gives unlimited permission to copy and/or distribute it, # with or without modifications, as long as this notice is preserved. # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY, to the extent permitted by law; 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