From 963acdfb8b40aca449cf61f85949b4d7bc5ee133 Mon Sep 17 00:00:00 2001 From: Michal Židek Date: Apr 06 2017 12:01:19 +0000 Subject: selinux: Do not fail if SELinux is not managed Previously we failed if semanage_is_managed returned 0 or -1 (not managed or error). With this patch we only fail in case of error and continue normally if selinux is not managed by libsemanage at all. Resolves: https://fedorahosted.org/sssd/ticket/3297 Reviewed-by: Lukáš Slebodník (cherry picked from commit 78a08d30b5fbf6e1e3b589e0cf67022e0c1faa33) (cherry picked from commit 31e4bc07ea17e3e91df28260f6a517b9774b948e) --- diff --git a/Makefile.am b/Makefile.am index 0c9fa43..0cc6714 100644 --- a/Makefile.am +++ b/Makefile.am @@ -3241,6 +3241,7 @@ selinux_child_SOURCES = \ src/util/sss_semanage.c \ src/util/atomic_io.c \ src/util/util.c \ + src/util/util_errors.c \ $(NULL) selinux_child_CFLAGS = \ $(AM_CFLAGS) \ diff --git a/src/providers/ipa/selinux_child.c b/src/providers/ipa/selinux_child.c index 3a15e7f..c84d55d 100644 --- a/src/providers/ipa/selinux_child.c +++ b/src/providers/ipa/selinux_child.c @@ -174,14 +174,19 @@ static bool seuser_needs_update(struct input_buffer *ibuf) ret = get_seuser(ibuf, ibuf->username, &db_seuser, &db_mls_range); DEBUG(SSSDBG_TRACE_INTERNAL, - "get_seuser: ret: %d seuser: %s mls: %s\n", - ret, db_seuser ? db_seuser : "unknown", + "get_seuser: ret: %d msg: [%s] seuser: %s mls: %s\n", + ret, sss_strerror(ret), + db_seuser ? db_seuser : "unknown", db_mls_range ? db_mls_range : "unknown"); if (ret == EOK && db_seuser && db_mls_range && strcmp(db_seuser, ibuf->seuser) == 0 && strcmp(db_mls_range, ibuf->mls_range) == 0) { needs_update = false; } + /* OR */ + if (ret == ERR_SELINUX_NOT_MANAGED) { + needs_update = false; + } talloc_free(db_seuser); talloc_free(db_mls_range); diff --git a/src/util/sss_semanage.c b/src/util/sss_semanage.c index d76677e..95e3af7 100644 --- a/src/util/sss_semanage.c +++ b/src/util/sss_semanage.c @@ -72,7 +72,7 @@ static void sss_semanage_close(semanage_handle_t *handle) semanage_handle_destroy(handle); } -static semanage_handle_t *sss_semanage_init(void) +static int sss_semanage_init(semanage_handle_t **_handle) { int ret; semanage_handle_t *handle = NULL; @@ -80,7 +80,8 @@ static semanage_handle_t *sss_semanage_init(void) handle = semanage_handle_create(); if (!handle) { DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux management handle\n"); - return NULL; + ret = EIO; + goto done; } semanage_msg_set_callback(handle, @@ -88,28 +89,41 @@ static semanage_handle_t *sss_semanage_init(void) NULL); ret = semanage_is_managed(handle); - if (ret != 1) { - DEBUG(SSSDBG_CRIT_FAILURE, "SELinux policy not managed\n"); - goto fail; + if (ret == 0) { + DEBUG(SSSDBG_TRACE_FUNC, "SELinux policy not managed via libsemanage\n"); + ret = ERR_SELINUX_NOT_MANAGED; + goto done; + } else if (ret == -1) { + DEBUG(SSSDBG_CRIT_FAILURE, "Call to semanage_is_managed failed\n"); + ret = EIO; + goto done; } ret = semanage_access_check(handle); if (ret < SEMANAGE_CAN_READ) { DEBUG(SSSDBG_CRIT_FAILURE, "Cannot read SELinux policy store\n"); - goto fail; + ret = EACCES; + goto done; } ret = semanage_connect(handle); if (ret != 0) { DEBUG(SSSDBG_CRIT_FAILURE, "Cannot estabilish SELinux management connection\n"); - goto fail; + ret = EIO; + goto done; } - return handle; -fail: - sss_semanage_close(handle); - return NULL; + ret = EOK; + +done: + if (ret != EOK) { + sss_semanage_close(handle); + } else { + *_handle = handle; + } + + return ret; } static int sss_semanage_user_add(semanage_handle_t *handle, @@ -227,10 +241,11 @@ int set_seuser(const char *login_name, const char *seuser_name, return EOK; } - handle = sss_semanage_init(); - if (!handle) { - DEBUG(SSSDBG_CRIT_FAILURE, "Cannot init SELinux management\n"); - ret = EIO; + ret = sss_semanage_init(&handle); + if (ret == ERR_SELINUX_NOT_MANAGED) { + goto done; + } else if (ret != EOK) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux handle\n"); goto done; } @@ -294,10 +309,11 @@ int del_seuser(const char *login_name) int ret; int exists = 0; - handle = sss_semanage_init(); - if (!handle) { - DEBUG(SSSDBG_CRIT_FAILURE, "Cannot init SELinux management\n"); - ret = EIO; + ret = sss_semanage_init(&handle); + if (ret == ERR_SELINUX_NOT_MANAGED) { + goto done; + } else if (ret != EOK) { + DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux handle\n"); goto done; } @@ -376,10 +392,11 @@ int get_seuser(TALLOC_CTX *mem_ctx, const char *login_name, semanage_seuser_t *sm_user = NULL; semanage_seuser_key_t *sm_key = NULL; - sm_handle = sss_semanage_init(); - if (sm_handle == NULL) { + ret = sss_semanage_init(&sm_handle); + if (ret == ERR_SELINUX_NOT_MANAGED) { + goto done; + } else if (ret != EOK) { DEBUG(SSSDBG_CRIT_FAILURE, "Cannot create SELinux handle\n"); - ret = EIO; goto done; } diff --git a/src/util/util_errors.c b/src/util/util_errors.c index c998e14..2d0b941 100644 --- a/src/util/util_errors.c +++ b/src/util/util_errors.c @@ -68,6 +68,7 @@ struct err_string error_to_str[] = { { "Cannot connect to system bus" }, /* ERR_NO_SYSBUS */ { "LDAP search returned a referral" }, /* ERR_REFERRAL */ { "Error setting SELinux user context" }, /* ERR_SELINUX_CONTEXT */ + { "SELinux is not managed by libsemanage" }, /* ERR_SELINUX_NOT_MANAGED */ { "Username format not allowed by re_expression" }, /* ERR_REGEX_NOMATCH */ { "Time specification not supported" }, /* ERR_TIMESPEC_NOT_SUPPORTED */ { "Invalid SSSD configuration detected" }, /* ERR_INVALID_CONFIG */ diff --git a/src/util/util_errors.h b/src/util/util_errors.h index c0d9622..8b70027 100644 --- a/src/util/util_errors.h +++ b/src/util/util_errors.h @@ -90,6 +90,7 @@ enum sssd_errors { ERR_NO_SYSBUS, ERR_REFERRAL, ERR_SELINUX_CONTEXT, + ERR_SELINUX_NOT_MANAGED, ERR_REGEX_NOMATCH, ERR_TIMESPEC_NOT_SUPPORTED, ERR_INVALID_CONFIG,