Do not save HBAC rules in subdomain subtree

Currently the sysdb context is pointed to the subdomain subtree
containing user the user to be checked at the beginning of a HBAC
request. As a result all HBAC rules and related data is save in the
subdomain tree as well. But since the HBAC rules of the configured
domain apply to all users it is sufficient to save them once in the
subtree of the configured domain.

Since most of the sysdb operations during a HBAC request are related to
the HBAC rules and related data this patch does not change the default
sysdb context but only create a special context to look up subdomain
users.

3 files changed, 32 insertions, 16 deletions

diff --git a/src/providers/ipa/ipa_access.c b/src/providers/ipa/ipa_access.c
index 5c97575f..3a34864c 100644
--- a/src/providers/ipa/ipa_access.c
+++ b/src/providers/ipa/ipa_access.c
@@ -85,16 +85,6 @@ void ipa_access_handler(struct be_req *be_req)
                               be_req->be_ctx->bet_info[BET_ACCESS].pvt_bet_data,
                               struct ipa_access_ctx);
 
-    if (strcasecmp(pd->domain, be_req->be_ctx->domain->name) != 0) {
-        be_req->domain = new_subdomain(be_req, be_req->be_ctx->domain, pd->domain, NULL, NULL);
-        if (be_req->domain == NULL) {
-            DEBUG(SSSDBG_OP_FAILURE, ("new_subdomain failed.\n"));
-            be_req->fn(be_req, DP_ERR_FATAL, PAM_SYSTEM_ERR, NULL);
-            return;
-        }
-        be_req->sysdb = be_req->domain->sysdb;
-    }
-
     /* First, verify that this account isn't locked.
      * We need to do this in case the auth phase was
      * skipped (such as during GSSAPI single-sign-on
diff --git a/src/providers/ipa/ipa_hbac_common.c b/src/providers/ipa/ipa_hbac_common.c
index 54628d80..33d1944e 100644
--- a/src/providers/ipa/ipa_hbac_common.c
+++ b/src/providers/ipa/ipa_hbac_common.c
@@ -440,6 +440,7 @@ hbac_ctx_to_eval_request(TALLOC_CTX *mem_ctx,
     struct sss_domain_info *domain = hbac_ctx_be(hbac_ctx)->domain;
     const char *rhost;
     const char *thost;
+    struct sss_domain_info *user_dom;
 
     tmp_ctx = talloc_new(mem_ctx);
     if (tmp_ctx == NULL) return ENOMEM;
@@ -452,9 +453,21 @@ hbac_ctx_to_eval_request(TALLOC_CTX *mem_ctx,
 
     eval_req->request_time = time(NULL);
 
-    /* Get user the user name and groups */
-    ret = hbac_eval_user_element(eval_req, sysdb,
-                                 pd->user, &eval_req->user);
+    /* Get user the user name and groups,
+     * take care of subdomain users as well */
+    if (strcasecmp(pd->domain, domain->name) != 0) {
+        user_dom = new_subdomain(tmp_ctx, domain, pd->domain, NULL, NULL);
+        if (user_dom == NULL) {
+            DEBUG(SSSDBG_OP_FAILURE, ("new_subdomain failed.\n"));
+            ret = ENOMEM;
+            goto done;
+        }
+        ret = hbac_eval_user_element(eval_req, user_dom->sysdb,
+                                     pd->user, &eval_req->user);
+    } else {
+        ret = hbac_eval_user_element(eval_req, sysdb,
+                                     pd->user, &eval_req->user);
+    }
     if (ret != EOK) goto done;
 
     /* Get the PAM service and service groups */
diff --git a/src/providers/ldap/sdap_access.c b/src/providers/ldap/sdap_access.c
index 88b52e26..b198e043 100644
--- a/src/providers/ldap/sdap_access.c
+++ b/src/providers/ldap/sdap_access.c
@@ -139,6 +139,7 @@ sdap_access_send(TALLOC_CTX *mem_ctx,
     struct tevent_req *req;
     struct ldb_result *res;
     const char *attrs[] = { "*", NULL };
+    struct sss_domain_info *user_dom;
 
     req = tevent_req_create(mem_ctx, &state, struct sdap_access_req_ctx);
     if (req == NULL) {
@@ -162,9 +163,21 @@ sdap_access_send(TALLOC_CTX *mem_ctx,
         goto done;
     }
 
-    /* Get original user DN */
-    ret = sysdb_get_user_attr(state, be_req->sysdb,
-                              pd->user, attrs, &res);
+    /* Get original user DN, take care of subdomain users as well */
+    if (strcasecmp(pd->domain, be_req->be_ctx->domain->name) != 0) {
+        user_dom = new_subdomain(state, be_req->be_ctx->domain, pd->domain,
+                                 NULL, NULL);
+        if (user_dom == NULL) {
+            DEBUG(SSSDBG_OP_FAILURE, ("new_subdomain failed.\n"));
+            ret = ENOMEM;
+            goto done;
+        }
+        ret = sysdb_get_user_attr(state, user_dom->sysdb,
+                                  pd->user, attrs, &res);
+    } else {
+        ret = sysdb_get_user_attr(state, be_req->sysdb,
+                                  pd->user, attrs, &res);
+    }
     if (ret != EOK) {
         if (ret == ENOENT) {
             /* If we can't find the user, return permission denied */