diff options
Diffstat (limited to 'src/libcharon/plugins/systime_fix')
| -rw-r--r-- | src/libcharon/plugins/systime_fix/Makefile.am | 15 | ||||
| -rw-r--r-- | src/libcharon/plugins/systime_fix/Makefile.in | 658 | ||||
| -rw-r--r-- | src/libcharon/plugins/systime_fix/systime_fix_plugin.c | 256 | ||||
| -rw-r--r-- | src/libcharon/plugins/systime_fix/systime_fix_plugin.h | 42 | ||||
| -rw-r--r-- | src/libcharon/plugins/systime_fix/systime_fix_validator.c | 83 | ||||
| -rw-r--r-- | src/libcharon/plugins/systime_fix/systime_fix_validator.h | 49 |
6 files changed, 1103 insertions, 0 deletions
diff --git a/src/libcharon/plugins/systime_fix/Makefile.am b/src/libcharon/plugins/systime_fix/Makefile.am new file mode 100644 index 000000000..a1f843db7 --- /dev/null +++ b/src/libcharon/plugins/systime_fix/Makefile.am @@ -0,0 +1,15 @@ + +INCLUDES = -I$(top_srcdir)/src/libstrongswan -I$(top_srcdir)/src/libhydra \ + -I$(top_srcdir)/src/libcharon + +if MONOLITHIC +noinst_LTLIBRARIES = libstrongswan-systime-fix.la +else +plugin_LTLIBRARIES = libstrongswan-systime-fix.la +endif + +libstrongswan_systime_fix_la_SOURCES = \ + systime_fix_validator.h systime_fix_validator.c \ + systime_fix_plugin.h systime_fix_plugin.c + +libstrongswan_systime_fix_la_LDFLAGS = -module -avoid-version diff --git a/src/libcharon/plugins/systime_fix/Makefile.in b/src/libcharon/plugins/systime_fix/Makefile.in new file mode 100644 index 000000000..56dc0b366 --- /dev/null +++ b/src/libcharon/plugins/systime_fix/Makefile.in @@ -0,0 +1,658 @@ +# Makefile.in generated by automake 1.11.6 from Makefile.am. +# 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install-pluginLTLIBRARIES install-ps install-ps-am \ + install-strip installcheck installcheck-am installdirs \ + maintainer-clean maintainer-clean-generic mostlyclean \ + mostlyclean-compile mostlyclean-generic mostlyclean-libtool \ + pdf pdf-am ps ps-am tags uninstall uninstall-am \ + uninstall-pluginLTLIBRARIES + + +# 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: diff --git a/src/libcharon/plugins/systime_fix/systime_fix_plugin.c b/src/libcharon/plugins/systime_fix/systime_fix_plugin.c new file mode 100644 index 000000000..7727ba03b --- /dev/null +++ b/src/libcharon/plugins/systime_fix/systime_fix_plugin.c @@ -0,0 +1,256 @@ +/* + * Copyright (C) 2013 Martin Willi + * Copyright (C) 2013 revosec AG + * + * 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. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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. + */ + +#include "systime_fix_plugin.h" +#include "systime_fix_validator.h" + +#include <daemon.h> +#include <processing/jobs/callback_job.h> +#include <processing/jobs/delete_ike_sa_job.h> +#include <processing/jobs/rekey_ike_sa_job.h> + +#include <time.h> + +/** + * Defining _XOPEN_SOURCE is difficult with libstrongswan includes, + * declare function explicitly. + */ +char *strptime(const char *s, const char *format, struct tm *tm); + +typedef struct private_systime_fix_plugin_t private_systime_fix_plugin_t; + +/** + * Private data of systime_fix plugin + */ +struct private_systime_fix_plugin_t { + + /** + * Implements plugin interface + */ + systime_fix_plugin_t public; + + /** + * Certificate lifetime validator + */ + systime_fix_validator_t *validator; + + /** + * Interval we check for a now-valid system time, in seconds. 0 if disabled + */ + u_int interval; + + /** + * Timestamp where we start considering system time valid + */ + time_t threshold; + + /** + * Do we trigger reauth or delete when finding expired certificates? + */ + bool reauth; +}; + +METHOD(plugin_t, get_name, char*, + private_systime_fix_plugin_t *this) +{ + return "systime-fix"; +} + +METHOD(plugin_t, destroy, void, + private_systime_fix_plugin_t *this) +{ + if (this->validator) + { + lib->credmgr->remove_validator(lib->credmgr, &this->validator->validator); + this->validator->destroy(this->validator); + } + free(this); +} + +/** + * Check if all certificates associated to an IKE_SA have valid lifetimes + */ +static bool has_invalid_certs(ike_sa_t *ike_sa) +{ + enumerator_t *cfgs, *items; + certificate_t *cert; + auth_rule_t type; + auth_cfg_t *auth; + time_t not_before, not_after; + bool valid = TRUE; + + cfgs = ike_sa->create_auth_cfg_enumerator(ike_sa, FALSE); + while (valid && cfgs->enumerate(cfgs, &auth)) + { + items = auth->create_enumerator(auth); + while (valid && items->enumerate(items, &type, &cert)) + { + switch (type) + { + case AUTH_RULE_SUBJECT_CERT: + case AUTH_RULE_IM_CERT: + case AUTH_RULE_CA_CERT: + if (!cert->get_validity(cert, NULL, ¬_before, ¬_after)) + { + DBG1(DBG_CFG, "certificate '%Y' invalid " + "(valid from %T to %T)", cert->get_subject(cert), + ¬_before, FALSE, ¬_after, FALSE); + valid = FALSE; + } + break; + default: + break; + } + } + items->destroy(items); + } + cfgs->destroy(cfgs); + + if (valid) + { + DBG1(DBG_CFG, "all certificates have valid lifetimes"); + } + return !valid; +} + +/** + * Check system time, reevaluate certificates + */ +static job_requeue_t check_systime(private_systime_fix_plugin_t *this) +{ + enumerator_t *enumerator; + ike_sa_t *ike_sa; + char *action; + job_t *job; + + if (time(NULL) < this->threshold) + { + DBG2(DBG_CFG, "systime not valid, rechecking in %ds", this->interval); + lib->scheduler->schedule_job(lib->scheduler, (job_t*) + callback_job_create((callback_job_cb_t)check_systime, this, + NULL, NULL), this->interval); + return JOB_REQUEUE_NONE; + } + + DBG1(DBG_CFG, "system time got valid, rechecking certificates"); + + enumerator = charon->ike_sa_manager->create_enumerator( + charon->ike_sa_manager, TRUE); + while (enumerator->enumerate(enumerator, &ike_sa)) + { + if (has_invalid_certs(ike_sa)) + { + if (this->reauth) + { + action = "reauthenticating"; + job = &rekey_ike_sa_job_create(ike_sa->get_id(ike_sa), + TRUE)->job_interface; + } + else + { + action = "deleting"; + job = &delete_ike_sa_job_create(ike_sa->get_id(ike_sa), + TRUE)->job_interface; + } + DBG1(DBG_CFG, "%s[%d] has certificates not valid, %s IKE_SA", + ike_sa->get_name(ike_sa), ike_sa->get_unique_id(ike_sa), + action); + lib->processor->queue_job(lib->processor, job); + } + } + enumerator->destroy(enumerator); + + return JOB_REQUEUE_NONE; +} + +/** + * Load cert lifetime validator configuration + */ +static bool load_validator(private_systime_fix_plugin_t *this) +{ + struct tm tm = { + .tm_mday = 1, + }; + char *str, *fmt; + + fmt = lib->settings->get_str(lib->settings, + "%s.plugins.%s.threshold_format", "%Y", charon->name, get_name(this)); + str = lib->settings->get_str(lib->settings, + "%s.plugins.%s.threshold", NULL, charon->name, get_name(this)); + if (!str) + { + DBG1(DBG_CFG, "no threshold configured for %s, disabled", + get_name(this)); + return FALSE; + } + if (strptime(str, fmt, &tm) == NULL) + { + DBG1(DBG_CFG, "threshold for %s invalid, disabled", get_name(this)); + return FALSE; + } + this->threshold = mktime(&tm); + if (this->threshold == -1) + { + DBG1(DBG_CFG, "converting threshold for %s failed, disabled", + get_name(this)); + return FALSE; + } + if (time(NULL) >= this->threshold) + { + DBG1(DBG_CFG, "system time looks good, disabling %s", get_name(this)); + return FALSE; + } + + DBG1(DBG_CFG, "enabling %s, threshold: %s", get_name(this), asctime(&tm)); + this->validator = systime_fix_validator_create(this->threshold); + lib->credmgr->add_validator(lib->credmgr, &this->validator->validator); + + return TRUE; +} + +/** + * Plugin constructor + */ +plugin_t *systime_fix_plugin_create() +{ + private_systime_fix_plugin_t *this; + + INIT(this, + .public = { + .plugin = { + .get_name = _get_name, + .reload = (void*)return_false, + .destroy = _destroy, + }, + }, + .interval = lib->settings->get_int(lib->settings, + "%s.plugins.%s.interval", 0, charon->name, get_name(this)), + .reauth = lib->settings->get_bool(lib->settings, + "%s.plugins.%s.reauth", FALSE, charon->name, get_name(this)), + ); + + if (load_validator(this)) + { + if (this->interval != 0) + { + DBG1(DBG_CFG, "starting systime check, interval: %ds", + this->interval); + lib->scheduler->schedule_job(lib->scheduler, (job_t*) + callback_job_create((callback_job_cb_t)check_systime, this, + NULL, NULL), this->interval); + } + } + return &this->public.plugin; +} diff --git a/src/libcharon/plugins/systime_fix/systime_fix_plugin.h b/src/libcharon/plugins/systime_fix/systime_fix_plugin.h new file mode 100644 index 000000000..402659539 --- /dev/null +++ b/src/libcharon/plugins/systime_fix/systime_fix_plugin.h @@ -0,0 +1,42 @@ +/* + * Copyright (C) 2013 Martin Willi + * Copyright (C) 2013 revosec AG + * + * 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. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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. + */ + +/** + * @defgroup systime_fix systime_fix + * @ingroup cplugins + * + * @defgroup systime_fix_plugin systime_fix_plugin + * @{ @ingroup systime_fix + */ + +#ifndef SYSTIME_FIX_PLUGIN_H_ +#define SYSTIME_FIX_PLUGIN_H_ + +#include <plugins/plugin.h> + +typedef struct systime_fix_plugin_t systime_fix_plugin_t; + +/** + * Plugin handling cert lifetimes gracefully if system time is out of sync. + */ +struct systime_fix_plugin_t { + + /** + * Implements plugin interface. + */ + plugin_t plugin; +}; + +#endif /** SYSTIME_FIX_PLUGIN_H_ @}*/ diff --git a/src/libcharon/plugins/systime_fix/systime_fix_validator.c b/src/libcharon/plugins/systime_fix/systime_fix_validator.c new file mode 100644 index 000000000..340e86cbc --- /dev/null +++ b/src/libcharon/plugins/systime_fix/systime_fix_validator.c @@ -0,0 +1,83 @@ +/* + * Copyright (C) 2013 Martin Willi + * Copyright (C) 2013 revosec AG + * + * 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. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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. + */ + +#include "systime_fix_validator.h" + +#include <errno.h> +#include <time.h> + +#include <daemon.h> + +typedef struct private_systime_fix_validator_t private_systime_fix_validator_t; + +/** + * Private data of an systime_fix_validator_t object. + */ +struct private_systime_fix_validator_t { + + /** + * Public systime_fix_validator_t interface. + */ + systime_fix_validator_t public; + + /** + * Timestamp where we start to consider system time valid + */ + time_t threshold; +}; + +METHOD(cert_validator_t, check_lifetime, status_t, + private_systime_fix_validator_t *this, certificate_t *cert, + int pathlen, bool anchor, auth_cfg_t *auth) +{ + if (time(NULL) < this->threshold) + { + /* our system time seems to be invalid, accept certificate */ + if (pathlen) + { /* report only once per validated chain */ + DBG1(DBG_CFG, "system time out of sync, skipping certificate " + "lifetime check"); + } + return SUCCESS; + } + /* validate this certificate normally */ + return NEED_MORE; +} + +METHOD(systime_fix_validator_t, destroy, void, + private_systime_fix_validator_t *this) +{ + free(this); +} + +/** + * See header + */ +systime_fix_validator_t *systime_fix_validator_create(time_t threshold) +{ + private_systime_fix_validator_t *this; + + INIT(this, + .public = { + .validator = { + .check_lifetime = _check_lifetime, + }, + .destroy = _destroy, + }, + .threshold = threshold, + ); + + return &this->public; +} diff --git a/src/libcharon/plugins/systime_fix/systime_fix_validator.h b/src/libcharon/plugins/systime_fix/systime_fix_validator.h new file mode 100644 index 000000000..3e651fd91 --- /dev/null +++ b/src/libcharon/plugins/systime_fix/systime_fix_validator.h @@ -0,0 +1,49 @@ +/* + * Copyright (C) 2013 Martin Willi + * Copyright (C) 2013 revosec AG + * + * 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. See <http://www.fsf.org/copyleft/gpl.txt>. + * + * 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. + */ + +/** + * @defgroup systime_fix_validator systime_fix_validator + * @{ @ingroup systime_fix + */ + +#ifndef SYSTIME_FIX_VALIDATOR_H_ +#define SYSTIME_FIX_VALIDATOR_H_ + +#include <credentials/cert_validator.h> + +typedef struct systime_fix_validator_t systime_fix_validator_t; + +/** + * Validator that accepts cert lifetimes if system time is out of sync. + */ +struct systime_fix_validator_t { + + /** + * Implements cert_validator_t interface. + */ + cert_validator_t validator; + + /** + * Destroy a systime_fix_validator_t. + */ + void (*destroy)(systime_fix_validator_t *this); +}; + +/** + * Create a systime_fix_validator instance. + */ +systime_fix_validator_t *systime_fix_validator_create(); + +#endif /** SYSTIME_FIX_VALIDATOR_H_ @}*/ |