From 42ec8af02ecf1937e4db9b1ecc6216022634f0f9 Mon Sep 17 00:00:00 2001 From: Michal Zidek Date: Wed, 24 Sep 2014 15:50:04 +0200 Subject: util: Move semanage related functions to src/util MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit These functions will be reused by IPA provider. Reviewed-by: Lukáš Slebodník --- src/util/sss_semanage.c | 360 ++++++++++++++++++++++++++++++++++++++++++++++++ src/util/util.h | 4 + 2 files changed, 364 insertions(+) create mode 100644 src/util/sss_semanage.c (limited to 'src/util') diff --git a/src/util/sss_semanage.c b/src/util/sss_semanage.c new file mode 100644 index 000000000..dbef3b343 --- /dev/null +++ b/src/util/sss_semanage.c @@ -0,0 +1,360 @@ +/* + SSSD + + sss_semanage.c + + Copyright (C) Jakub Hrozek 2010 + + 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 3 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, see . +*/ + +#include "config.h" + +#include + +#ifdef HAVE_SEMANAGE +#include +#endif + +#include "util/util.h" + +#ifndef DEFAULT_SERANGE +#define DEFAULT_SERANGE "s0" +#endif + +#ifdef HAVE_SEMANAGE +/* turn libselinux messages into SSSD DEBUG() calls */ +static void sss_semanage_error_callback(void *varg, + semanage_handle_t *handle, + const char *fmt, ...) +{ + int level = SSSDBG_INVALID; + int ret; + char * message = NULL; + va_list ap; + + switch (semanage_msg_get_level(handle)) { + case SEMANAGE_MSG_ERR: + level = SSSDBG_CRIT_FAILURE; + break; + case SEMANAGE_MSG_WARN: + level = SSSDBG_MINOR_FAILURE; + break; + case SEMANAGE_MSG_INFO: + level = SSSDBG_TRACE_FUNC; + break; + } + + va_start(ap, fmt); + ret = vasprintf(&message, fmt, ap); + va_end(ap); + if (ret < 0) { + /* ENOMEM */ + return; + } + + if (DEBUG_IS_SET(level)) + debug_fn(__FILE__, __LINE__, "libsemanage", level, "%s\n", message); + free(message); +} + +static semanage_handle_t *sss_semanage_init(void) +{ + int ret; + semanage_handle_t *handle = NULL; + + handle = semanage_handle_create(); + if (!handle) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux management handle\n"); + return NULL; + } + + semanage_msg_set_callback(handle, + sss_semanage_error_callback, + NULL); + + ret = semanage_is_managed(handle); + if (ret != 1) { + DEBUG(SSSDBG_CRIT_FAILURE, "SELinux policy not managed\n"); + goto fail; + } + + ret = semanage_access_check(handle); + if (ret < SEMANAGE_CAN_READ) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot read SELinux policy store\n"); + goto fail; + } + + ret = semanage_connect(handle); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Cannot estabilish SELinux management connection\n"); + goto fail; + } + + ret = semanage_begin_transaction(handle); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot begin SELinux transaction\n"); + goto fail; + } + + return handle; +fail: + semanage_handle_destroy(handle); + return NULL; +} + +static int sss_semanage_user_add(semanage_handle_t *handle, + semanage_seuser_key_t *key, + const char *login_name, + const char *seuser_name) +{ + int ret; + semanage_seuser_t *seuser = NULL; + + ret = semanage_seuser_create(handle, &seuser); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Cannot create SELinux login mapping for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_set_name(handle, seuser, login_name); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Could not set name for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_set_mlsrange(handle, seuser, DEFAULT_SERANGE); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Could not set serange for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_set_sename(handle, seuser, seuser_name); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Could not set SELinux user for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_modify_local(handle, key, seuser); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Could not add login mapping for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = EOK; +done: + semanage_seuser_free(seuser); + return ret; +} + +static int sss_semanage_user_mod(semanage_handle_t *handle, + semanage_seuser_key_t *key, + const char *login_name, + const char *seuser_name) +{ + int ret; + semanage_seuser_t *seuser = NULL; + + semanage_seuser_query(handle, key, &seuser); + if (seuser == NULL) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Could not query seuser for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_set_mlsrange(handle, seuser, DEFAULT_SERANGE); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Could not set serange for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_set_sename(handle, seuser, seuser_name); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Could not set sename for %s\n", login_name); + ret = EIO; + goto done; + } + + ret = semanage_seuser_modify_local(handle, key, seuser); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + ("Could not modify login mapping for %s\n"), login_name); + ret = EIO; + goto done; + } + + ret = EOK; +done: + semanage_seuser_free(seuser); + return ret; +} + +int set_seuser(const char *login_name, const char *seuser_name) +{ + semanage_handle_t *handle = NULL; + semanage_seuser_key_t *key = NULL; + int ret; + int seuser_exists = 0; + + if (seuser_name == NULL) { + /* don't care, just let system pick the defaults */ + return EOK; + } + + handle = sss_semanage_init(); + if (!handle) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot init SELinux management\n"); + ret = EIO; + goto done; + } + + ret = semanage_seuser_key_create(handle, login_name, &key); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux user key\n"); + ret = EIO; + goto done; + } + + ret = semanage_seuser_exists(handle, key, &seuser_exists); + if (ret < 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot verify the SELinux user\n"); + ret = EIO; + goto done; + } + + if (seuser_exists) { + ret = sss_semanage_user_mod(handle, key, login_name, seuser_name); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot modify SELinux user mapping\n"); + ret = EIO; + goto done; + } + } else { + ret = sss_semanage_user_add(handle, key, login_name, seuser_name); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot add SELinux user mapping\n"); + ret = EIO; + goto done; + } + } + + ret = semanage_commit(handle); + if (ret < 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot commit SELinux transaction\n"); + ret = EIO; + goto done; + } + + ret = EOK; +done: + semanage_seuser_key_free(key); + semanage_handle_destroy(handle); + return ret; +} + +int del_seuser(const char *login_name) +{ + semanage_handle_t *handle = NULL; + semanage_seuser_key_t *key = NULL; + int ret; + int exists = 0; + + handle = sss_semanage_init(); + if (!handle) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot init SELinux management\n"); + ret = EIO; + goto done; + } + + ret = semanage_seuser_key_create(handle, login_name, &key); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux user key\n"); + ret = EIO; + goto done; + } + + ret = semanage_seuser_exists(handle, key, &exists); + if (ret < 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot verify the SELinux user\n"); + ret = EIO; + goto done; + } + + if (!exists) { + DEBUG(SSSDBG_FUNC_DATA, + "Login mapping for %s is not defined, OK if default mapping " + "was used\n", login_name); + ret = EOK; /* probably default mapping */ + goto done; + } + + ret = semanage_seuser_exists_local(handle, key, &exists); + if (ret < 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot verify the SELinux user\n"); + ret = EIO; + goto done; + } + + if (!exists) { + DEBUG(SSSDBG_CRIT_FAILURE, "Login mapping for %s is defined in policy, " + "cannot be deleted", login_name); + ret = ENOENT; + goto done; + } + + ret = semanage_seuser_del_local(handle, key); + if (ret != 0) { + DEBUG(SSSDBG_CRIT_FAILURE, + "Could not delete login mapping for %s", login_name); + ret = EIO; + goto done; + } + + ret = semanage_commit(handle); + if (ret < 0) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot commit SELinux transaction\n"); + ret = EIO; + goto done; + } + + ret = EOK; +done: + semanage_handle_destroy(handle); + return ret; +} + +#else /* HAVE_SEMANAGE */ +int set_seuser(const char *login_name, const char *seuser_name) +{ + return EOK; +} + +int del_seuser(const char *login_name) +{ + return EOK; +} +#endif /* HAVE_SEMANAGE */ diff --git a/src/util/util.h b/src/util/util.h index 0ac9b0104..b43ce6f50 100644 --- a/src/util/util.h +++ b/src/util/util.h @@ -591,4 +591,8 @@ errno_t switch_creds(TALLOC_CTX *mem_ctx, struct sss_creds **saved_creds); errno_t restore_creds(struct sss_creds *saved_creds); +/* from sss_semanage.c */ +int set_seuser(const char *login_name, const char *seuser_name); +int del_seuser(const char *login_name); + #endif /* __SSSD_UTIL_H__ */ -- cgit