selinux: Delete existing user mapping on empty default

https://fedorahosted.org/sssd/ticket/2587

The case of SELinux default user mapping being an empty string is valid,
it should translate into "pick the default context on the target
machine".

In case the context is empty, we need to delete the per-user mapping from
the SELinux database to make sure the default is used.

Reviewed-by: Michal Židek <mzidek@redhat.com>
Reviewed-by: Pavel Reichl <preichl@redhat.com>
(cherry picked from commit 01f78f755fde63997ccfded71fb8395569b11430)

2 files changed, 17 insertions, 7 deletions

diff --git a/src/providers/ipa/ipa_selinux.c b/src/providers/ipa/ipa_selinux.c
index 133b679b6..1172424cb 100644
--- a/src/providers/ipa/ipa_selinux.c
+++ b/src/providers/ipa/ipa_selinux.c
@@ -749,7 +749,7 @@ static errno_t choose_best_seuser(TALLOC_CTX *mem_ctx,
 
     /* If no maps match, we'll use the default SELinux user from the
      * config */
-    seuser_mls_str = talloc_strdup(tmp_ctx, default_user);
+    seuser_mls_str = talloc_strdup(tmp_ctx, default_user ? default_user : "");
     if (seuser_mls_str == NULL) {
         ret = ENOMEM;
         goto done;
@@ -1373,11 +1373,13 @@ ipa_get_selinux_maps_offline(struct tevent_req *req)
         return ENOMEM;
     }
 
-    ret = sysdb_attrs_add_string(state->defaults,
-                                 IPA_CONFIG_SELINUX_DEFAULT_USER_CTX,
-                                 default_user);
-    if (ret != EOK) {
-        return ret;
+    if (default_user) {
+        ret = sysdb_attrs_add_string(state->defaults,
+                                    IPA_CONFIG_SELINUX_DEFAULT_USER_CTX,
+                                    default_user);
+        if (ret != EOK) {
+            return ret;
+        }
     }
 
     ret = sysdb_attrs_add_string(state->defaults,
diff --git a/src/providers/ipa/selinux_child.c b/src/providers/ipa/selinux_child.c
index d46703896..2f79dea10 100644
--- a/src/providers/ipa/selinux_child.c
+++ b/src/providers/ipa/selinux_child.c
@@ -146,7 +146,15 @@ static int sc_set_seuser(const char *login_name, const char *seuser_name,
      * the directories are created with the expected permissions
      */
     old_mask = umask(0);
-    ret = set_seuser(login_name, seuser_name, mls);
+    if (strcmp(seuser_name, "") == 0) {
+        /* An empty SELinux user should cause SSSD to use the system
+         * default. We need to remove the SELinux user from the DB
+         * in that case
+         */
+        ret = del_seuser(login_name);
+    } else {
+        ret = set_seuser(login_name, seuser_name, mls);
+    }
     umask(old_mask);
     return ret;
 }