Fix re_expression matching with subdomains

This patch fixes an issue which resulted in a need to initialize
responder with data from local domain, otherwise it would not correctly
detect requests for subdomains. Similar situation can occur if new
subdomain is added at runtime.

The solution is to ask for a list of subdomains in case there is a
candidate domain identified in the process of matching re_expressions
with given name.

1 files changed, 55 insertions, 33 deletions

diff --git a/src/responder/pam/pamsrv_cmd.c b/src/responder/pam/pamsrv_cmd.c
index f6c1e835..2d0324e5 100644
--- a/src/responder/pam/pamsrv_cmd.c
+++ b/src/responder/pam/pamsrv_cmd.c
@@ -851,32 +851,12 @@ static void pam_dom_forwarder(struct pam_auth_req *preq);
  * PAM_ENVIRONMENT, so that we can save performing some calls and cache
  * data. */
 
-static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
+errno_t pam_forwarder_parse_data(struct cli_ctx *cctx, struct pam_data *pd)
 {
-    struct sss_domain_info *dom;
-    struct pam_auth_req *preq;
-    struct pam_data *pd;
     uint8_t *body;
     size_t blen;
-    int ret;
-    errno_t ncret;
-    struct pam_ctx *pctx =
-            talloc_get_type(cctx->rctx->pvt_ctx, struct pam_ctx);
+    errno_t ret;
     uint32_t terminator = SSS_END_OF_PAM_REQUEST;
-    struct tevent_req *req;
-
-    preq = talloc_zero(cctx, struct pam_auth_req);
-    if (!preq) {
-        return ENOMEM;
-    }
-    preq->cctx = cctx;
-
-    preq->pd = talloc_zero(preq, struct pam_data);
-    if (!preq->pd) {
-        talloc_free(preq);
-        return ENOMEM;
-    }
-    pd = preq->pd;
 
     sss_packet_get_body(cctx->creq->in, &body, &blen);
     if (blen >= sizeof(uint32_t) &&
@@ -886,9 +866,6 @@ static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
         goto done;
     }
 
-    pd->cmd = pam_cmd;
-    pd->priv = cctx->priv;
-
     switch (cctx->cli_protocol_version->version) {
         case 1:
             ret = pam_parse_in_data(cctx->rctx->domains, pd, body, blen);
@@ -904,7 +881,49 @@ static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
                       cctx->cli_protocol_version->version));
             ret = EINVAL;
     }
-    if (ret != EOK) {
+
+done:
+    return ret;
+}
+
+static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
+{
+    struct sss_domain_info *dom;
+    struct pam_auth_req *preq;
+    struct pam_data *pd;
+    int ret;
+    errno_t ncret;
+    struct pam_ctx *pctx =
+            talloc_get_type(cctx->rctx->pvt_ctx, struct pam_ctx);
+    struct tevent_req *req;
+
+    preq = talloc_zero(cctx, struct pam_auth_req);
+    if (!preq) {
+        return ENOMEM;
+    }
+    preq->cctx = cctx;
+
+    preq->pd = talloc_zero(preq, struct pam_data);
+    if (!preq->pd) {
+        talloc_free(preq);
+        return ENOMEM;
+    }
+    pd = preq->pd;
+
+    pd->cmd = pam_cmd;
+    pd->priv = cctx->priv;
+
+    ret = pam_forwarder_parse_data(cctx, pd);
+    if (ret == EAGAIN) {
+        req = sss_dp_get_domains_send(cctx->rctx, cctx->rctx, true, pd->domain);
+        if (req == NULL) {
+            ret = ENOMEM;
+        } else {
+            tevent_req_set_callback(req, pam_forwarder_cb, preq);
+            ret = EAGAIN;
+        }
+        goto done;
+    } else if (ret != EOK) {
         ret = EINVAL;
         goto done;
     }
@@ -913,13 +932,7 @@ static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
     if (pd->domain) {
         preq->domain = responder_get_domain(preq, cctx->rctx, pd->domain);
         if (!preq->domain) {
-            req = sss_dp_get_domains_send(cctx->rctx, cctx->rctx, true, pd->domain);
-            if (req == NULL) {
-                ret = ENOMEM;
-            } else {
-                tevent_req_set_callback(req, pam_forwarder_cb, preq);
-                ret = EAGAIN;
-            }
+            ret = ENOENT;
             goto done;
         }
     } else {
@@ -969,6 +982,7 @@ static void pam_forwarder_cb(struct tevent_req *req)
     struct pam_auth_req *preq = tevent_req_callback_data(req,
                                                          struct pam_auth_req);
     struct cli_ctx *cctx = preq->cctx;
+    struct pam_data *pd;
     errno_t ret = EOK;
 
     ret = sss_dp_get_domains_recv(req);
@@ -977,6 +991,14 @@ static void pam_forwarder_cb(struct tevent_req *req)
         goto done;
     }
 
+    pd = preq->pd;
+
+    ret = pam_forwarder_parse_data(cctx, pd);
+    if (ret != EOK) {
+        ret = EINVAL;
+        goto done;
+    }
+
     if (preq->pd->domain) {
         preq->domain = responder_get_domain(preq, cctx->rctx, preq->pd->domain);
         if (preq->domain == NULL) {