mod_intercept_form_submit-1.1.0/0000775000175000017500000000000013015247412016612 5ustar adeltonadeltonmod_intercept_form_submit-1.1.0/docs/0000775000175000017500000000000012243012162017534 5ustar adeltonadeltonmod_intercept_form_submit-1.1.0/docs/typical_form_based_authentication.txt0000664000175000017500000000262112237035660027236 0ustar adeltonadelton 1. User accesses application's URL: http://app.example.com/hosts 2. Browser issues HTTP GET request to app.exmple.com for /hosts --- GET /hosts ---> 3. Apache runs or hands the request over to application 4. Application does not find valid session cookie 5. Application redirects the browser to logon page <--- 302 Location /login?back=/hosts --- 6. Browser accesses the logon page /login --- GET /login?back=/hosts ---> 7. Apache runs or hands the request over to application 8. Application does not see POST with login & password 9. Application returns logon form <--- 200 + page with logon form, action set back to /login --- 10. User fills in the login and password and hits "Log in" 11. Browser submits the form --- POST /login ---> 12. Apache runs or hands the request over to application 13. Application validates the login & password; if they are not valid, go to 9 with message "Bad login or password" 14. Application creates session, returns session cookies <--- 302 Location /hosts with Set-Cookie --- 15. Like 2, now with Cookie set --- GET /hosts ---> 16. Apache runs or hands the request over to application 17. Application sees valid session cookie, returns the page <--- 200 + the /hosts page that user wanted to see --- mod_intercept_form_submit-1.1.0/docs/form_based_authentication_with_mod_intercept_form_submit.txt0000664000175000017500000000436012243012200034046 0ustar adeltonadelton 1. User accesses application's URL: http://app.example.com/hosts 2. Browser issues HTTP GET request to app.exmple.com for /hosts --- GET /hosts ---> 3. Apache runs or hands the request over to application 4. Application does not find valid session cookie 5. Application redirects the browser to logon page <--- 302 Location /login?back=/hosts --- 6. Browser accesses the logon page /login --- GET /login?back=/hosts ---> 7. Apache runs or hands the request over to application 8. Application does not see POST with login & password 9. Application returns logon form <--- 200 + page with logon form, action set back to /login --- 10. User fills in the login and password and hits "Log in" 11. Browser submits the form --- POST /login ---> 12.1. Module mod_intercept_form_submit gets invoked 12.2. Module parses the post data, finds the login & password 12.3. If login not in InterceptFormLoginSkip, runs pam_authenticate 12.4. If login in InterceptFormLoginSkip and InterceptFormClearRemoteUserForSkipped on, clears possible existing REMOTE_USER / r->user 12.5. If InterceptFormPasswordRedact on, replaces the password in the POST data with [REDACTED] 12.6. If pam_authenticate passes, module sets the REMOTE_USER environment variable and r->user 12.7. If pam_authenticate passes and mod_lookup_identity loaded, it gets called 12.8. (orig 12) Apache runs or hands the request over to application 13.1. Application gets run 13.2. When it sees REMOTE_USER, it trusts it 13.3. (orig 13) Otherwise it validates the login & password; if they are not valid, go to 9 with message "Bad login or password" 14. Application creates session, returns session cookies <--- 302 Location /hosts with Set-Cookie --- 15. Like 2, now with Cookie set --- GET /hosts ---> 16. Apache runs or hands the request over to application 17. Application sees valid session cookie, returns the page <--- 200 + the /hosts page that user wanted to see --- mod_intercept_form_submit-1.1.0/intercept_form_submit.module0000664000175000017500000000012112354206675024431 0ustar adeltonadelton # LoadModule intercept_form_submit_module modules/mod_intercept_form_submit.so mod_intercept_form_submit-1.1.0/intercept_form_submit.conf0000664000175000017500000000024512354206675024100 0ustar adeltonadelton # # InterceptFormPAMService http_application_sss # InterceptFormLogin user_login # InterceptFormPassword user_password # mod_intercept_form_submit-1.1.0/mod_intercept_form_submit.c0000644000175000017500000004455313015245551024233 0ustar adeltonadelton /* * Copyright 2013--2016 Jan Pazdziora * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "apr_strings.h" #include "apr_optional.h" #include "http_core.h" #include "http_log.h" #include "http_config.h" #include "http_request.h" #include "mod_auth.h" typedef struct ifs_config { char * login_name; char * password_name; int password_redact; char * pam_service; apr_hash_t * login_blacklist; int clear_blacklisted; int success_to_get; apr_array_header_t * realms; } ifs_config; typedef struct { apr_status_t cached_ret; apr_bucket_brigade * cached_brigade; apr_bucket * password_fragment_start_bucket; int password_fragment_start_bucket_offset; } ifs_filter_ctx_t; module AP_MODULE_DECLARE_DATA intercept_form_submit_module; #ifdef APLOG_USE_MODULE #define SHOW_MODULE "" #else #define SHOW_MODULE "mod_intercept_form_submit: " #endif APR_DECLARE_OPTIONAL_FN(authn_status, pam_authenticate_with_login_password, (request_rec * r, const char * pam_service, const char * login, const char * password, int steps)); static APR_OPTIONAL_FN_TYPE(pam_authenticate_with_login_password) * pam_authenticate_with_login_password_fn = NULL; static const char * add_login_to_blacklist(cmd_parms * cmd, void * conf_void, const char * arg) { ifs_config * cfg = (ifs_config *) conf_void; if (cfg) { if (! cfg->login_blacklist) { cfg->login_blacklist = apr_hash_make(cmd->pool); } apr_hash_set(cfg->login_blacklist, apr_pstrdup(cmd->pool, arg), APR_HASH_KEY_STRING, "1"); } return NULL; } static const char * add_realm(cmd_parms * cmd, void * conf_void, const char * arg) { ifs_config * cfg = (ifs_config *) conf_void; if (cfg) { if (! cfg->realms) { cfg->realms = apr_array_make(cmd->pool, 1, sizeof(char *)); } *(const char **) apr_array_push(cfg->realms) = arg; } return NULL; } static const command_rec directives[] = { AP_INIT_TAKE1("InterceptFormLogin", ap_set_string_slot, (void *)APR_OFFSETOF(ifs_config, login_name), ACCESS_CONF, "Name of the login parameter in the POST request"), AP_INIT_TAKE1("InterceptFormPassword", ap_set_string_slot, (void *)APR_OFFSETOF(ifs_config, password_name), ACCESS_CONF, "Name of the password parameter in the POST request"), AP_INIT_FLAG("InterceptFormPasswordRedact", ap_set_flag_slot, (void *)APR_OFFSETOF(ifs_config, password_redact), ACCESS_CONF, "When password is seen in the POST for non-blacklisted user, the value will be redacted"), AP_INIT_TAKE1("InterceptFormPAMService", ap_set_string_slot, (void *)APR_OFFSETOF(ifs_config, pam_service), ACCESS_CONF, "PAM service to authenticate against"), AP_INIT_ITERATE("InterceptFormLoginSkip", add_login_to_blacklist, NULL, ACCESS_CONF, "Login name(s) for which no PAM authentication will be done"), AP_INIT_FLAG("InterceptFormClearRemoteUserForSkipped", ap_set_flag_slot, (void *)APR_OFFSETOF(ifs_config, clear_blacklisted), ACCESS_CONF, "When authentication is skipped for users listed with InterceptFormLoginSkip, clear r->user and REMOTE_USER"), AP_INIT_FLAG("InterceptGETOnSuccess", ap_set_flag_slot, (void *)APR_OFFSETOF(ifs_config, success_to_get), ACCESS_CONF, "When authentication passes, turn the POST request to GET internally"), AP_INIT_ITERATE("InterceptFormLoginRealms", add_realm, NULL, ACCESS_CONF, "Realm(s) that will be appended to login name which does not have one"), { NULL } }; #define _REMOTE_USER_ENV_NAME "REMOTE_USER" static void register_pam_authenticate_with_login_password_fn(void) { pam_authenticate_with_login_password_fn = APR_RETRIEVE_OPTIONAL_FN(pam_authenticate_with_login_password); } static int hex2char(int c) { if (c >= '0' && c <= '9') return c - '0'; if (c >= 'a' && c <= 'z') return c - 'a' + 10; if (c >= 'A' && c <= 'Z') return c - 'A' + 10; return -1; } static char * intercept_form_submit_process_keyval(apr_pool_t * pool, const char * name, const char * key, int key_len, const char * val, int val_len) { if (val_len == 0) return NULL; int i; for (i = 0; i < key_len; i++, name++) { if (*name == '\0') return NULL; int c = key[i]; if (c == '+') c = ' '; else if (c == '%') { if (i > key_len - 3) return NULL; int m = hex2char(key[++i]); int n = hex2char(key[++i]); if (m < 0 || n < 0) return NULL; c = (m << 4) + n; } if (c != *name) return NULL; } if (*name != '\0') return NULL; char * ret = apr_palloc(pool, val_len + 1); char * p = ret; for (i = 0; i < val_len; i++, p++) { if (val[i] == '+') *p = ' '; else if (val[i] == '%') { if (i > val_len - 3) return NULL; int m = hex2char(val[++i]); int n = hex2char(val[++i]); if (m < 0 || n < 0) return NULL; *p = (m << 4) + n; } else { *p = val[i]; } } *p = '\0'; return ret; } static authn_status pam_authenticate_in_realms(request_rec * r, const char * pam_service, const char * login, const char * password, apr_array_header_t * realms, int steps) { if (strchr(login, '@') || (! realms) || (! realms->nelts)) { return pam_authenticate_with_login_password_fn(r, pam_service, login, password, steps); } authn_status first_status = AUTH_GENERAL_ERROR; int i; for (i = 0; i < realms->nelts; i++) { const char * realm = ((const char**)realms->elts)[i]; const char * full_login = login; if (realm && strlen(realm)) full_login = apr_pstrcat(r->pool, login, "@", realm, NULL); authn_status status = pam_authenticate_with_login_password_fn(r, pam_service, full_login, password, steps); if (status == AUTH_GRANTED) return status; if (i == 0) first_status = status; } return first_status; } #define _REDACTED_STRING "[REDACTED]" static void intercept_form_redact_password(ap_filter_t * f, ifs_config * config) { request_rec * r = f->r; ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "will redact password (value of %s) in the POST data", config->password_name); ifs_filter_ctx_t * ctx = f->ctx; apr_bucket * b = ctx->password_fragment_start_bucket; int fragment_start_bucket_offset = ctx->password_fragment_start_bucket_offset; if (fragment_start_bucket_offset) { apr_bucket_split(b, fragment_start_bucket_offset); b = APR_BUCKET_NEXT(b); } char * new_password_data = apr_pstrcat(r->pool, config->password_name, "=", _REDACTED_STRING, NULL); int new_password_data_length = strlen(new_password_data); apr_bucket * new_b = apr_bucket_immortal_create(new_password_data, new_password_data_length, f->c->bucket_alloc); APR_BUCKET_INSERT_BEFORE(b, new_b); int password_remove_length = 0; apr_bucket * remove_b = NULL; do { if (remove_b) { apr_bucket_delete(remove_b); remove_b = NULL; } if (b == APR_BRIGADE_SENTINEL(ctx->cached_brigade)) { break; } if (APR_BUCKET_IS_METADATA(b)) continue; const char * buffer; apr_size_t nbytes; if (apr_bucket_read(b, &buffer, &nbytes, APR_BLOCK_READ) != APR_SUCCESS) continue; if (! nbytes) continue; const char * e = memchr(buffer, '&', nbytes); if (e) { password_remove_length += (e - buffer); remove_b = b; apr_bucket_split(b, (e - buffer)); break; } else { password_remove_length += nbytes; remove_b = b; } } while ((b = APR_BUCKET_NEXT(b))); if (remove_b) { apr_bucket_delete(remove_b); } if (password_remove_length != new_password_data_length) { const char * orig_content_length = apr_table_get(r->headers_in, "Content-Length"); if (orig_content_length) { char * end; apr_off_t content_length; apr_status_t status = apr_strtoff(&content_length, orig_content_length, &end, 10); if (status != APR_SUCCESS || *end || end == orig_content_length || content_length < 0) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, SHOW_MODULE "Failed to parse the original Content-Length value %s, cannot update it after redacting password, clearing", orig_content_length); apr_table_unset(r->headers_in, "Content-Length"); } else { apr_table_setn(r->headers_in, "Content-Length", apr_psprintf(r->pool, "%ld", content_length - password_remove_length + new_password_data_length)); } } } } static int intercept_form_submit_process_buffer(ap_filter_t * f, ifs_config * config, char ** login_value, char ** password_value, const char * buffer, int buffer_length, apr_bucket * fragment_start_bucket, int fragment_start_bucket_offset, authn_status * out_status) { char * sep = memchr(buffer, '=', buffer_length); if (! sep) { return 0; } request_rec * r = f->r; int run_auth = 0; if (! *login_value) { *login_value = intercept_form_submit_process_keyval(r->pool, config->login_name, buffer, sep - buffer, sep + 1, buffer_length - (sep - buffer) - 1); if (*login_value) { ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, SHOW_MODULE "login found in POST: %s=%s", config->login_name, *login_value); if (config->login_blacklist && apr_hash_get(config->login_blacklist, *login_value, APR_HASH_KEY_STRING)) { ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, SHOW_MODULE "login %s in blacklist, stopping", *login_value); if (config->clear_blacklisted > 0) { apr_table_unset(r->subprocess_env, _REMOTE_USER_ENV_NAME); r->user = NULL; } return 1; } if (*password_value) { run_auth = 1; } } } if (! *password_value) { *password_value = intercept_form_submit_process_keyval(r->pool, config->password_name, buffer, sep - buffer, sep + 1, buffer_length - (sep - buffer) - 1); if (*password_value) { ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, SHOW_MODULE "password found in POST: %s=" _REDACTED_STRING, config->password_name); if (*login_value) { run_auth = 1; } ifs_filter_ctx_t * ctx = f->ctx; ctx->password_fragment_start_bucket = fragment_start_bucket; ctx->password_fragment_start_bucket_offset = fragment_start_bucket_offset; } } if (run_auth) { if (! pam_authenticate_with_login_password_fn) { ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, SHOW_MODULE "pam_authenticate_with_login_password not found; perhaps mod_authnz_pam is not loaded"); return 0; } (*out_status) = pam_authenticate_in_realms(r, config->pam_service, *login_value, *password_value, config->realms, 3); if (config->password_redact > 0) { intercept_form_redact_password(f, config); } return 1; } return 0; } static apr_status_t intercept_form_submit_filter(ap_filter_t * f, apr_bucket_brigade * bb, ap_input_mode_t mode, apr_read_type_e block, apr_off_t readbytes) { ifs_filter_ctx_t * ctx = f->ctx; if (ctx && ctx->cached_brigade) { APR_BRIGADE_CONCAT(bb, ctx->cached_brigade); apr_brigade_cleanup(ctx->cached_brigade); ctx->cached_brigade = NULL; return ctx->cached_ret; } return ap_get_brigade(f->next, bb, mode, block, readbytes); } static apr_status_t intercept_form_submit_filter_prefetch(request_rec * r, ifs_config * config, ap_filter_t * f) { if (r->status != 200) return DECLINED; ifs_filter_ctx_t * ctx = f->ctx; if (! ctx) { f->ctx = ctx = apr_pcalloc(r->pool, sizeof(ifs_filter_ctx_t)); ctx->cached_brigade = apr_brigade_create(f->c->pool, f->c->bucket_alloc); } char * login_value = NULL; char * password_value = NULL; char * fragment = NULL; int fragment_length = 0; apr_bucket * fragment_start_bucket = NULL; int fragment_start_bucket_offset = 0; authn_status out_status = AUTH_GENERAL_ERROR; apr_bucket_brigade * bb = apr_brigade_create(f->c->pool, f->c->bucket_alloc); int fetch_more = 1; while (fetch_more) { ctx->cached_ret = ap_get_brigade(f->next, bb, AP_MODE_READBYTES, APR_BLOCK_READ, HUGE_STRING_LEN); if (ctx->cached_ret != APR_SUCCESS) break; apr_bucket * b = APR_BRIGADE_FIRST(bb); APR_BRIGADE_CONCAT(ctx->cached_brigade, bb); for (; b != APR_BRIGADE_SENTINEL(ctx->cached_brigade); b = APR_BUCKET_NEXT(b)) { if (! fetch_more) break; if (APR_BUCKET_IS_EOS(b)) { if (fragment) intercept_form_submit_process_buffer(f, config, &login_value, &password_value, fragment, fragment_length, fragment_start_bucket, fragment_start_bucket_offset, &out_status); ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "hit EOS"); fetch_more = 0; break; } if (APR_BUCKET_IS_METADATA(b)) continue; const char * buffer; apr_size_t nbytes; if (apr_bucket_read(b, &buffer, &nbytes, APR_BLOCK_READ) != APR_SUCCESS) continue; if (! nbytes) continue; const char * p = buffer; const char * e; while ((nbytes > 0) && (e = memchr(p, '&', nbytes))) { if (fragment) { int new_length = fragment_length + (e - p); fragment = realloc(fragment, new_length); memcpy(fragment + fragment_length, p, e - p); if (intercept_form_submit_process_buffer(f, config, &login_value, &password_value, fragment, new_length, fragment_start_bucket, fragment_start_bucket_offset, &out_status)) { fetch_more = 0; break; } free(fragment); fragment = NULL; } else { if (intercept_form_submit_process_buffer(f, config, &login_value, &password_value, p, e - p, b, (p - buffer), &out_status)) { fetch_more = 0; break; } } nbytes -= (e - p) + 1; p = e + 1; } if (! fetch_more) break; if (nbytes > 0) { if (fragment) { int new_length = fragment_length + nbytes; fragment = realloc(fragment, new_length); memcpy(fragment + fragment_length, p, nbytes); fragment_length = new_length; } else if (APR_BUCKET_NEXT(b) && APR_BUCKET_IS_EOS(APR_BUCKET_NEXT(b))) { /* shortcut if this is the last bucket, slurp the rest */ intercept_form_submit_process_buffer(f, config, &login_value, &password_value, p, nbytes, b, (p - buffer), &out_status); fetch_more = 0; } else { fragment = malloc(nbytes); memcpy(fragment, p, nbytes); fragment_length = nbytes; fragment_start_bucket = b; fragment_start_bucket_offset = p - buffer; } } } } if (fragment) free(fragment); return out_status == AUTH_GRANTED ? OK : DECLINED; } #define _INTERCEPT_CONTENT_TYPE "application/x-www-form-urlencoded" static apr_status_t intercept_form_submit_init(request_rec * r) { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "intercept_form_submit_init invoked"); if (r->method_number != M_POST) { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "skipping, no POST request"); return DECLINED; } ifs_config * config = ap_get_module_config(r->per_dir_config, &intercept_form_submit_module); if (!(config && config->login_name && config->password_name && config->pam_service)) { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "skipping, not configured"); return DECLINED; } if (apr_table_get(r->subprocess_env, _REMOTE_USER_ENV_NAME)) { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "skipping, " _REMOTE_USER_ENV_NAME " already set"); return DECLINED; } const char * content_type = apr_table_get(r->headers_in, "Content-Type"); if (content_type) { char * content_type_pure = apr_pstrdup(r->pool, content_type); char * sep; if ((sep = strchr(content_type_pure, ';'))) { *sep = '\0'; } apr_collapse_spaces(content_type_pure, content_type_pure); if (!apr_strnatcasecmp(content_type_pure, _INTERCEPT_CONTENT_TYPE)) { ap_filter_t * the_filter = ap_add_input_filter("intercept_form_submit_filter", NULL, r, r->connection); ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "inserted filter intercept_form_submit_filter, starting intercept_form_submit_filter_prefetch"); apr_status_t status = intercept_form_submit_filter_prefetch(r, config, the_filter); if (status == OK && config->success_to_get >= 0) { ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "intercept_form_submit_filter_prefetch returned OK, turning the method to GET"); r->status_line = NULL; r->method = "GET"; r->method_number = M_GET; apr_table_unset(r->headers_in, "Content-Length"); } return DECLINED; } } ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, SHOW_MODULE "skipping, no " _INTERCEPT_CONTENT_TYPE); return DECLINED; } static void * create_dir_conf(apr_pool_t * pool, char * dir) { ifs_config * cfg = apr_pcalloc(pool, sizeof(ifs_config)); cfg->password_redact = -1; cfg->clear_blacklisted = -1; cfg->success_to_get = -1; return cfg; } static void * merge_dir_conf(apr_pool_t * pool, void * base_void, void * add_void) { ifs_config * base = (ifs_config *) base_void; ifs_config * add = (ifs_config *) add_void; ifs_config * cfg = (ifs_config *) create_dir_conf(pool, NULL); cfg->login_name = add->login_name ? add->login_name : base->login_name; cfg->password_name = add->password_name ? add->password_name : base->password_name; cfg->password_redact = add->password_redact >= 0 ? add->password_redact : base->password_redact; cfg->success_to_get = add->success_to_get >= 0 ? add->success_to_get : base->success_to_get; cfg->clear_blacklisted = add->clear_blacklisted >= 0 ? add->clear_blacklisted : base->clear_blacklisted; cfg->pam_service = add->pam_service ? add->pam_service : base->pam_service; if (add->login_blacklist) { if (base->login_blacklist) { cfg->login_blacklist = apr_hash_overlay(apr_hash_pool_get(add->login_blacklist), add->login_blacklist, base->login_blacklist); } else { cfg->login_blacklist = add->login_blacklist; } } else if (base->login_blacklist) { cfg->login_blacklist = base->login_blacklist; } cfg->realms = add->realms ? add->realms : base->realms; return cfg; } static void register_hooks(apr_pool_t * pool) { ap_hook_fixups(intercept_form_submit_init, NULL, NULL, APR_HOOK_MIDDLE); ap_register_input_filter("intercept_form_submit_filter", intercept_form_submit_filter, NULL, AP_FTYPE_RESOURCE); ap_hook_optional_fn_retrieve(register_pam_authenticate_with_login_password_fn, NULL, NULL, APR_HOOK_MIDDLE); } #ifdef AP_DECLARE_MODULE AP_DECLARE_MODULE(intercept_form_submit) #else module AP_MODULE_DECLARE_DATA intercept_form_submit_module #endif = { STANDARD20_MODULE_STUFF, create_dir_conf, /* Per-directory configuration handler */ merge_dir_conf, /* Merge handler for per-directory configurations */ NULL, /* Per-server configuration handler */ NULL, /* Merge handler for per-server configurations */ directives, /* Any directives we may have for httpd */ register_hooks /* Our hook registering function */ }; mod_intercept_form_submit-1.1.0/mod_intercept_form_submit.spec0000664000175000017500000000723613015245716024745 0ustar adeltonadelton%{!?_httpd_mmn: %{expand: %%global _httpd_mmn %%(cat %{_includedir}/httpd/.mmn || echo 0-0)}} %{!?_httpd_apxs: %{expand: %%global _httpd_apxs %%{_sbindir}/apxs}} %{!?_httpd_confdir: %{expand: %%global _httpd_confdir %%{_sysconfdir}/httpd/conf.d}} # /etc/httpd/conf.d with httpd < 2.4 and defined as /etc/httpd/conf.modules.d with httpd >= 2.4 %{!?_httpd_modconfdir: %{expand: %%global _httpd_modconfdir %%{_sysconfdir}/httpd/conf.d}} %{!?_httpd_moddir: %{expand: %%global _httpd_moddir %%{_libdir}/httpd/modules}} Summary: Apache module to intercept login form submission and run PAM authentication Name: mod_intercept_form_submit Version: 1.1.0 Release: 1%{?dist} License: ASL 2.0 Group: System Environment/Daemons URL: http://www.adelton.com/apache/mod_intercept_form_submit/ Source0: http://www.adelton.com/apache/mod_intercept_form_submit/%{name}-%{version}.tar.gz BuildRequires: httpd-devel BuildRequires: pkgconfig Requires: httpd-mmn = %{_httpd_mmn} Requires: mod_authnz_pam >= 0.7 # Suppres auto-provides for module DSO per # https://fedoraproject.org/wiki/Packaging:AutoProvidesAndRequiresFiltering#Summary %{?filter_provides_in: %filter_provides_in %{_libdir}/httpd/modules/.*\.so$} %{?filter_setup} %description mod_intercept_form_submit can intercept submission of application login forms. It retrieves the login and password information from the POST HTTP request, runs PAM authentication with those credentials, and sets the REMOTE_USER environment variable if the authentication passes. %prep %setup -q -n %{name}-%{version} %build %{_httpd_apxs} -c -Wc,"%{optflags} -Wall -pedantic -std=c99" mod_intercept_form_submit.c %if "%{_httpd_modconfdir}" != "%{_httpd_confdir}" echo > intercept_form_submit.confx echo "# Load the module in %{_httpd_modconfdir}/55-intercept_form_submit.conf" >> intercept_form_submit.confx cat intercept_form_submit.conf >> intercept_form_submit.confx %else cat intercept_form_submit.module > intercept_form_submit.confx cat intercept_form_submit.conf >> intercept_form_submit.confx %endif %install rm -rf $RPM_BUILD_ROOT install -Dm 755 .libs/mod_intercept_form_submit.so $RPM_BUILD_ROOT%{_httpd_moddir}/mod_intercept_form_submit.so %if "%{_httpd_modconfdir}" != "%{_httpd_confdir}" # httpd >= 2.4.x install -Dp -m 0644 intercept_form_submit.module $RPM_BUILD_ROOT%{_httpd_modconfdir}/55-intercept_form_submit.conf %endif install -Dp -m 0644 intercept_form_submit.confx $RPM_BUILD_ROOT%{_httpd_confdir}/intercept_form_submit.conf %files %doc README LICENSE docs/* %if "%{_httpd_modconfdir}" != "%{_httpd_confdir}" %config(noreplace) %{_httpd_modconfdir}/55-intercept_form_submit.conf %endif %config(noreplace) %{_httpd_confdir}/intercept_form_submit.conf %{_httpd_moddir}/*.so %changelog * Wed Nov 23 2016 Jan Pazdziora - 1.1.0-1 - Logging improvements. * Fri May 06 2016 Jan Pazdziora - 1.0.1-1 - Add support for InterceptGETOnSuccess. * Mon Mar 21 2016 Jan Pazdziora - 1.0.0-1 - 1319094 - the Requires(pre) httpd does not seem to be needed. * Mon Jun 30 2014 Jan Pazdziora - 0.9.8-1 - 1109923 - Fix module loading/configuration for Apache 2.4. - Document the runtime dependency on pam_authenticate_with_login_password. - Comment/code cleanup. * Tue May 13 2014 Jan Pazdziora - 0.9.7-1 - No longer call lookup_identity_hook explicitly, hook order does the same. - Silence compile warnings by specifying C99. * Tue Apr 15 2014 Jan Pazdziora - 0.9.6-1 - Add support for InterceptFormLoginRealms. * Thu Jan 30 2014 Jan Pazdziora - 0.9.5-1 - 1058809 - .spec changes for Fedora package review. mod_intercept_form_submit-1.1.0/README0000664000175000017500000001331212713104107017467 0ustar adeltonadelton Apache module mod_intercept_form_submit ======================================= Apache module to intercept submission of application login forms. It retrieves the login and password information from the POST HTTP request, runs PAM authentication with those credentials, and sets the REMOTE_USER environment variable if the authentication passes. The internal r->user field is also set so other modules can use it (even if the module is invoked very late in the request processing). If the REMOTE_USER is already set (presumably by some previous module), no authentication takes place. If the PAM authentication fails, environment variable EXTERNAL_AUTH_ERROR is set to the string describing the error. The assumption is that the application will be amended to trust the REMOTE_USER value if it is set and skip its own login/password validation (see the docs/ directory for outline of the interaction). Module configuration -------------------- Module mod_authnz_pam needs to be installed and loaded with LoadModule authnz_pam_module modules/mod_authnz_pam.so because mod_intercept_form_submit uses it to do the actual PAM operations. The mod_intercept_form_submit module needs to be configured for Location that the application uses to process the login form POST requests. The configuration has to specify three values: InterceptFormPAMService name_of_the_PAM_service The PAM service to authenticate against. InterceptFormLogin the_login_field_name Name of the login field in the login form, and thus the login parameter in the POST request. InterceptFormPassword the_password_field_name Name of the password field in the login form, and thus the password parameter in the POST request. All three parameters above need to be specified or the interception will not be enabled. Optional parameters: InterceptFormLoginSkip one_login [or_more_logins] List of logins to ignore (never attempt to authenticate). By default authentication will be attempted for all logins. InterceptFormClearRemoteUserForSkipped on|off When set to on and authentication is skipped for users listed with InterceptFormLoginSkip, clears r->user and REMOTE_USER. Default is off. InterceptFormPasswordRedact on|off When set to on and authentication is attempted (no matter if it passes or fails), the value of the password will be modified in the POST data to string [REDACTED]. Default is off. InterceptFormLoginRealms REALM1 [other REALM2] List of realm/domain names to append to the login and try in cycle when the login does not contain the '@' sign. This can be used for force particular realms without users being forced to enter them. Empty string can be used in the list to explicitly try authentication without any realm. This can be used with mod_auth_kerb's (default) KrbMethodK5Passwd Off to present login names including realms to web applications. By default, no modifications to login happens. InterceptGETOnSuccess on|off When the authentication using the POST data passes, the method of the request is internally changed to GET. This stops applications and frameworks that insist on running their own authentication on POST irrespective of REMOTE_USER value to think that they process GET. Example: LoadModule intercept_form_submit_module modules/mod_intercept_form_submit.so LoadModule authnz_pam_module modules/mod_authnz_pam.so InterceptFormPAMService http_application_sss InterceptFormLogin login[login] InterceptFormPassword login[password] InterceptFormLoginSkip admin InterceptFormClearRemoteUserForSkipped on InterceptFormPasswordRedact on InterceptFormLoginRealms EXAMPLE.COM LAB.EXAMPLE.COM '' InterceptGETOnSuccess on The PAM service needs to be configured. For the above shown http_application_sss example, file /etc/pam.d/http_application_sss could be created with content auth required pam_sss.so account required pam_sss.so to authenticate against sssd. On SELinux enabled systems, boolean allow_httpd_mod_auth_pam needs to be enabled: setsebool -P allow_httpd_mod_auth_pam 1 Building from sources --------------------- When building from sources, command apxs -i -a -c mod_intercept_form_submit.c -Wall -pedantic should build and install the module. Dependency on mod_authnz_pam ---------------------------- Module mod_intercept_form_submit has soft (runtime) dependency on function pam_authenticate_with_login_password with prototype authn_status pam_authenticate_with_login_password( request_rec * r, const char * pam_service, const char * login, const char * password, int steps ); This function is typically provided by module mod_authnz_pam, and is called to achieve the actual authentication via the PAM stack. When mod_authnz_pam is not loaded and thus this function not available, error mod_intercept_form_submit: pam_authenticate_with_login_password not found; perhaps mod_authnz_pam is not loaded is logged and authentication does not take place. License ------- Copyright 2013--2016 Jan Pazdziora Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at http://www.apache.org/licenses/LICENSE-2.0 Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 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See the License for the specific language governing permissions and limitations under the License. mod_intercept_form_submit-1.1.0/Makefile0000664000175000017500000000125512713104107020252 0ustar adeltonadelton NAME=mod_intercept_form_submit SOURCE0 := $(shell spectool $(NAME).spec) SOURCE := $(shell echo $(SOURCE0) | sed 's%^.*/%%') NAME_VER := $(shell echo $(SOURCE) | sed 's%\.tar\.gz$$%%') all: @echo 'Usage: make dist to build the .tar.gz' @echo ' make timestamps set file timestamps to match commit times' timestamps: git ls-files | while read -r f ; do touch -ch -d "$$(git log -1 --format=%ci "$$f")" "$$f" ; done dist: @if test -f ../$(SOURCE) ; then ( echo "The source [../$(SOURCE)] already exists." >&2 ; exit 1 ) ; fi @mkdir .dist @mkdir .dist/$(NAME_VER) && cp -rp * .dist/$(NAME_VER) tar cvzf ../$(SOURCE) -C .dist $(NAME_VER) @rm -rf .dist