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-rw-r--r--lib/semanage.c361
1 files changed, 361 insertions, 0 deletions
diff --git a/lib/semanage.c b/lib/semanage.c
new file mode 100644
index 0000000..082a6e8
--- /dev/null
+++ b/lib/semanage.c
@@ -0,0 +1,361 @@
+/*
+ * SPDX-FileCopyrightText: 2010 , Jakub Hrozek <jhrozek@redhat.com>
+ * SPDX-FileCopyrightText: 2011 , Peter Vrabec <pvrabec@redhat.com>
+ *
+ * SPDX-License-Identifier: BSD-3-Clause
+ */
+
+#include <config.h>
+
+#ifdef WITH_SELINUX
+
+#include "defines.h"
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
+#include <stdio.h>
+#include <stdarg.h>
+#include <selinux/selinux.h>
+#include <semanage/semanage.h>
+#include "prototypes.h"
+
+#include "shadowlog_internal.h"
+
+#ifndef DEFAULT_SERANGE
+#define DEFAULT_SERANGE "s0"
+#endif
+
+
+format_attr(printf, 3, 4)
+static void semanage_error_callback (unused void *varg,
+ semanage_handle_t *handle,
+ const char *fmt, ...)
+{
+ int ret;
+ char * message = NULL;
+ va_list ap;
+
+
+ va_start (ap, fmt);
+ ret = vasprintf (&message, fmt, ap);
+ va_end (ap);
+ if (ret < 0) {
+ /* ENOMEM */
+ return;
+ }
+
+ switch (semanage_msg_get_level (handle)) {
+ case SEMANAGE_MSG_ERR:
+ case SEMANAGE_MSG_WARN:
+ fprintf (shadow_logfd, _("[libsemanage]: %s\n"), message);
+ break;
+ case SEMANAGE_MSG_INFO:
+ /* nop */
+ break;
+ }
+
+ free (message);
+}
+
+
+static semanage_handle_t *semanage_init (void)
+{
+ int ret;
+ semanage_handle_t *handle = NULL;
+
+ handle = semanage_handle_create ();
+ if (NULL == handle) {
+ fprintf (shadow_logfd,
+ _("Cannot create SELinux management handle\n"));
+ return NULL;
+ }
+
+ semanage_msg_set_callback (handle, semanage_error_callback, NULL);
+
+ ret = semanage_is_managed (handle);
+ if (ret != 1) {
+ fprintf (shadow_logfd, _("SELinux policy not managed\n"));
+ goto fail;
+ }
+
+ ret = semanage_access_check (handle);
+ if (ret < SEMANAGE_CAN_READ) {
+ fprintf (shadow_logfd, _("Cannot read SELinux policy store\n"));
+ goto fail;
+ }
+
+ ret = semanage_connect (handle);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Cannot establish SELinux management connection\n"));
+ goto fail;
+ }
+
+ ret = semanage_begin_transaction (handle);
+ if (ret != 0) {
+ fprintf (shadow_logfd, _("Cannot begin SELinux transaction\n"));
+ goto fail;
+ }
+
+ return handle;
+
+fail:
+ semanage_handle_destroy (handle);
+ return NULL;
+}
+
+
+static int 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 (NULL == seuser) {
+ fprintf (shadow_logfd,
+ _("Could not query seuser for %s\n"), login_name);
+ ret = 1;
+ goto done;
+ }
+
+ if (semanage_mls_enabled(handle)) {
+ ret = semanage_seuser_set_mlsrange (handle, seuser, DEFAULT_SERANGE);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not set serange for %s\n"), login_name);
+ ret = 1;
+ goto done;
+ }
+ }
+
+ ret = semanage_seuser_set_sename (handle, seuser, seuser_name);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not set sename for %s\n"),
+ login_name);
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_modify_local (handle, key, seuser);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not modify login mapping for %s\n"),
+ login_name);
+ ret = 1;
+ goto done;
+ }
+
+ ret = 0;
+done:
+ semanage_seuser_free (seuser);
+ return ret;
+}
+
+
+static int 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) {
+ fprintf (shadow_logfd,
+ _("Cannot create SELinux login mapping for %s\n"),
+ login_name);
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_set_name (handle, seuser, login_name);
+ if (ret != 0) {
+ fprintf (shadow_logfd, _("Could not set name for %s\n"), login_name);
+ ret = 1;
+ goto done;
+ }
+
+ if (semanage_mls_enabled(handle)) {
+ ret = semanage_seuser_set_mlsrange (handle, seuser, DEFAULT_SERANGE);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not set serange for %s\n"), login_name);
+ ret = 1;
+ goto done;
+ }
+ }
+
+ ret = semanage_seuser_set_sename (handle, seuser, seuser_name);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not set SELinux user for %s\n"),
+ login_name);
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_modify_local (handle, key, seuser);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not add login mapping for %s\n"),
+ login_name);
+ ret = 1;
+ goto done;
+ }
+
+ ret = 0;
+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 (NULL == seuser_name) {
+ /* don't care, just let system pick the defaults */
+ return 0;
+ }
+
+ handle = semanage_init ();
+ if (NULL == handle) {
+ fprintf (shadow_logfd, _("Cannot init SELinux management\n"));
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_key_create (handle, login_name, &key);
+ if (ret != 0) {
+ fprintf (shadow_logfd, _("Cannot create SELinux user key\n"));
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_exists (handle, key, &seuser_exists);
+ if (ret < 0) {
+ fprintf (shadow_logfd, _("Cannot verify the SELinux user\n"));
+ ret = 1;
+ goto done;
+ }
+
+ if (0 != seuser_exists) {
+ ret = semanage_user_mod (handle, key, login_name, seuser_name);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Cannot modify SELinux user mapping\n"));
+ ret = 1;
+ goto done;
+ }
+ } else {
+ ret = semanage_user_add (handle, key, login_name, seuser_name);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Cannot add SELinux user mapping\n"));
+ ret = 1;
+ goto done;
+ }
+ }
+
+ ret = semanage_commit (handle);
+ if (ret < 0) {
+ fprintf (shadow_logfd, _("Cannot commit SELinux transaction\n"));
+ ret = 1;
+ goto done;
+ }
+
+ ret = 0;
+ reset_selinux_handle();
+
+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 = semanage_init ();
+ if (NULL == handle) {
+ fprintf (shadow_logfd, _("Cannot init SELinux management\n"));
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_key_create (handle, login_name, &key);
+ if (ret != 0) {
+ fprintf (shadow_logfd, _("Cannot create SELinux user key\n"));
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_seuser_exists (handle, key, &exists);
+ if (ret < 0) {
+ fprintf (shadow_logfd, _("Cannot verify the SELinux user\n"));
+ ret = 1;
+ goto done;
+ }
+
+ if (0 == exists) {
+ fprintf (shadow_logfd,
+ _("Login mapping for %s is not defined, OK if default mapping was used\n"),
+ login_name);
+ ret = 0; /* probably default mapping */
+ goto done;
+ }
+
+ ret = semanage_seuser_exists_local (handle, key, &exists);
+ if (ret < 0) {
+ fprintf (shadow_logfd, _("Cannot verify the SELinux user\n"));
+ ret = 1;
+ goto done;
+ }
+
+ if (0 == exists) {
+ fprintf (shadow_logfd,
+ _("Login mapping for %s is defined in policy, cannot be deleted\n"),
+ login_name);
+ ret = 0; /* Login mapping defined in policy can't be deleted */
+ goto done;
+ }
+
+ ret = semanage_seuser_del_local (handle, key);
+ if (ret != 0) {
+ fprintf (shadow_logfd,
+ _("Could not delete login mapping for %s"),
+ login_name);
+ ret = 1;
+ goto done;
+ }
+
+ ret = semanage_commit (handle);
+ if (ret < 0) {
+ fprintf (shadow_logfd, _("Cannot commit SELinux transaction\n"));
+ ret = 1;
+ goto done;
+ }
+
+ ret = 0;
+done:
+ semanage_handle_destroy (handle);
+ return ret;
+}
+#else /* !WITH_SELINUX */
+extern int errno; /* warning: ANSI C forbids an empty source file */
+#endif /* !WITH_SELINUX */
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