sysdb: convert sysdb_getpwnam

3 files changed, 309 insertions, 448 deletions

diff --git a/src/responder/nss/nsssrv_cmd.c b/src/responder/nss/nsssrv_cmd.c
index 042517ad..d25c467a 100644
--- a/src/responder/nss/nsssrv_cmd.c
+++ b/src/responder/nss/nsssrv_cmd.c
@@ -33,6 +33,7 @@ struct nss_cmd_ctx {
     bool immediate;
     bool check_next;
     bool enum_cached;
+
 };
 
 struct dom_ctx {
@@ -115,6 +116,61 @@ static int fill_empty(struct sss_packet *packet)
     return EOK;
 }
 
+static int nss_cmd_send_empty(struct nss_cmd_ctx *cmdctx)
+{
+    struct cli_ctx *cctx = cmdctx->cctx;
+    int ret;
+
+    /* create response packet */
+    ret = sss_packet_new(cctx->creq, 0,
+                         sss_packet_get_cmd(cctx->creq->in),
+                         &cctx->creq->out);
+    if (ret != EOK) {
+        return ret;
+    }
+    ret =  fill_empty(cctx->creq->out);
+    if (ret != EOK) {
+        return ret;
+    }
+    sss_packet_set_error(cctx->creq->out, EOK);
+    sss_cmd_done(cctx, cmdctx);
+    return EOK;
+}
+
+static int nss_cmd_done(struct nss_cmd_ctx *cmdctx, int ret)
+{
+    switch (ret) {
+    case EOK:
+        /* all fine, just return here */
+        break;
+
+    case ENOENT:
+        ret = nss_cmd_send_empty(cmdctx);
+        if (ret) {
+            return EFAULT;
+        }
+        break;
+
+    case EAGAIN:
+        /* async processing, just return here */
+        break;
+
+    case EFAULT:
+        /* very bad error */
+        return EFAULT;
+
+    default:
+        ret = nss_cmd_send_error(cmdctx, ret);
+        if (ret) {
+            return EFAULT;
+        }
+        sss_cmd_done(cmdctx->cctx, cmdctx);
+        break;
+    }
+
+    return EOK;
+}
+
 /****************************************************************************
  * PASSWD db related functions
  ***************************************************************************/
@@ -260,6 +316,36 @@ done:
     return EOK;
 }
 
+static int nss_cmd_getpw_send_reply(struct nss_dom_ctx *dctx, bool filter)
+{
+    struct nss_cmd_ctx *cmdctx = dctx->cmdctx;
+    struct cli_ctx *cctx = cmdctx->cctx;
+    struct nss_ctx *nctx;
+    int ret;
+
+    nctx = talloc_get_type(cctx->rctx->pvt_ctx, struct nss_ctx);
+
+    ret = sss_packet_new(cctx->creq, 0,
+                         sss_packet_get_cmd(cctx->creq->in),
+                         &cctx->creq->out);
+    if (ret != EOK) {
+        return EFAULT;
+    }
+    ret = fill_pwent(cctx->creq->out,
+                     dctx->domain,
+                     nctx, filter,
+                     dctx->res->msgs, dctx->res->count);
+    if (ret) {
+        return ret;
+    }
+    sss_packet_set_error(cctx->creq->out, EOK);
+    sss_cmd_done(cctx, cmdctx);
+    return EOK;
+}
+
+
+/* FIXME: do not check res->count, but get in a msgs and check in parent */
+/* FIXME: do not sss_cmd_done, but return error and let parent do it */
 static errno_t check_cache(struct nss_dom_ctx *dctx,
                            struct nss_ctx *nctx,
                            struct ldb_result *res,
@@ -387,7 +473,6 @@ static errno_t check_cache(struct nss_dom_ctx *dctx,
                 NSS_CMD_FATAL_ERROR_CODE(cctx, EIO);
             }
             sss_cmd_done(cctx, cmdctx);
-            return EIO;
         }
 
         return EAGAIN;
@@ -399,155 +484,114 @@ static errno_t check_cache(struct nss_dom_ctx *dctx,
 static void nss_cmd_getpwnam_dp_callback(uint16_t err_maj, uint32_t err_min,
                                          const char *err_msg, void *ptr);
 
-static void nss_cmd_getpwnam_callback(void *ptr, int status,
-                                   struct ldb_result *res)
+/* search for a user.
+ * Returns:
+ *   ENOENT, if user is definitely not found
+ *   EAGAIN, if user is beeing fetched from backend via async operations
+ *   EOK, if found
+ *   anything else on a fatal error
+ */
+
+static int nss_cmd_getpwnam_search(struct nss_dom_ctx *dctx)
 {
-    struct nss_dom_ctx *dctx = talloc_get_type(ptr, struct nss_dom_ctx);
     struct nss_cmd_ctx *cmdctx = dctx->cmdctx;
+    struct sss_domain_info *dom = dctx->domain;
     struct cli_ctx *cctx = cmdctx->cctx;
+    const char *name = cmdctx->name;
     struct sysdb_ctx *sysdb;
-    struct sss_domain_info *dom;
     struct nss_ctx *nctx;
-    uint8_t *body;
-    size_t blen;
-    bool neghit = false;
-    int ncret;
     int ret;
 
     nctx = talloc_get_type(cctx->rctx->pvt_ctx, struct nss_ctx);
 
-    if (status != LDB_SUCCESS) {
-        ret = nss_cmd_send_error(cmdctx, status);
-        if (ret != EOK) {
-            NSS_CMD_FATAL_ERROR(cctx);
-        }
-        sss_cmd_done(cctx, cmdctx);
-        return;
-    }
-
-    if (dctx->check_provider) {
-        ret = check_cache(dctx, nctx, res,
-                          SSS_DP_USER, cmdctx->name, 0,
-                          nss_cmd_getpwnam_dp_callback);
-        if (ret != EOK) {
-            /* Anything but EOK means we should reenter the mainloop
-             * because we may be refreshing the cache
-             */
-            return;
+    while (dom) {
+       /* if it is a domainless search, skip domains that require fully
+         * qualified names instead */
+        while (dom && cmdctx->check_next && dom->fqnames) {
+            dom = dom->next;
         }
-    }
 
-    switch (res->count) {
-    case 0:
-        if (cmdctx->check_next) {
+        if (!dom) break;
 
-            ret = EOK;
+        if (dom != dctx->domain) {
+            /* make sure we reset the check_provider flag when we check
+             * a new domain */
+            dctx->check_provider = NEED_CHECK_PROVIDER(dom->provider);
+        }
 
-            /* skip domains that require FQnames or have negative caches */
-            for (dom = dctx->domain->next; dom; dom = dom->next) {
+        /* make sure to update the dctx if we changed domain */
+        dctx->domain = dom;
 
-                if (dom->fqnames) continue;
+        /* verify this user has not yet been negatively cached,
+        * or has been permanently filtered */
+        ret = nss_ncache_check_user(nctx->ncache, nctx->neg_timeout,
+                                    dom->name, name);
 
-                ncret = nss_ncache_check_user(nctx->ncache,
-                                              nctx->neg_timeout,
-                                              dom->name, cmdctx->name);
-                if (ncret == ENOENT) break;
+        /* if neg cached, return we didn't find it */
+        if (ret == EEXIST) {
+            DEBUG(2, ("User [%s] does not exist! (negative cache)\n", name));
+            return ENOENT;
+        }
 
-                neghit = true;
-            }
-            /* reset neghit if we still have a domain to check */
-            if (dom) neghit = false;
+        DEBUG(4, ("Requesting info for [%s@%s]\n", name, dom->name));
 
-           if (neghit) {
-                DEBUG(2, ("User [%s] does not exist! (negative cache)\n",
-                          cmdctx->name));
-                ret = ENOENT;
-            }
-            if (dom == NULL) {
-                DEBUG(2, ("No matching domain found for [%s], fail!\n",
-                          cmdctx->name));
-                ret = ENOENT;
-            }
+        ret = sysdb_get_ctx_from_list(cctx->rctx->db_list, dom, &sysdb);
+        if (ret != EOK) {
+            DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
+            return EIO;
+        }
 
-            if (ret == EOK) {
-                dctx->domain = dom;
-                dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
-                if (dctx->res) talloc_free(res);
-                dctx->res = NULL;
+        ret = sysdb_getpwnam(cmdctx, sysdb, dom, name, &dctx->res);
+        if (ret != EOK) {
+            DEBUG(1, ("Failed to make request to our cache!\n"));
+            return EIO;
+        }
 
-                DEBUG(4, ("Requesting info for [%s@%s]\n",
-                          cmdctx->name, dctx->domain->name));
+        if (dctx->res->count > 1) {
+            DEBUG(0, ("getpwnam call returned more than one result !?!\n"));
+            return ENOENT;
+        }
 
-                ret = sysdb_get_ctx_from_list(cctx->rctx->db_list,
-                                              dctx->domain, &sysdb);
-                if (ret != EOK) {
-                    DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
-                    NSS_CMD_FATAL_ERROR(cctx);
-                }
-                ret = sysdb_getpwnam(cmdctx, sysdb,
-                                     dctx->domain, cmdctx->name,
-                                     nss_cmd_getpwnam_callback, dctx);
-                if (ret != EOK) {
-                    DEBUG(1, ("Failed to make request to our cache!\n"));
-                }
+        if (dctx->res->count == 0 && !dctx->check_provider) {
+            /* if a multidomain search, try with next */
+            if (cmdctx->check_next) {
+                dom = dom->next;
+                continue;
             }
 
-            /* we made another call, end here */
-            if (ret == EOK) return;
-        }
+            DEBUG(2, ("No results for getpwnam call\n"));
 
-        DEBUG(2, ("No results for getpwnam call\n"));
-
-        /* set negative cache only if not result of cache check */
-        if (!neghit) {
-            ret = nss_ncache_set_user(nctx->ncache, false,
-                                      dctx->domain->name, cmdctx->name);
+            /* set negative cache only if not result of cache check */
+            ret = nss_ncache_set_user(nctx->ncache, false, dom->name, name);
             if (ret != EOK) {
-                NSS_CMD_FATAL_ERROR(cctx);
+                return ret;
             }
-        }
 
-        ret = sss_packet_new(cctx->creq, 2*sizeof(uint32_t),
-                             sss_packet_get_cmd(cctx->creq->in),
-                             &cctx->creq->out);
-        if (ret != EOK) {
-            NSS_CMD_FATAL_ERROR(cctx);
+            return ENOENT;
         }
-        sss_packet_get_body(cctx->creq->out, &body, &blen);
-        ((uint32_t *)body)[0] = 0; /* 0 results */
-        ((uint32_t *)body)[1] = 0; /* reserved */
-        break;
 
-    case 1:
-        DEBUG(6, ("Returning info for user [%s]\n", cmdctx->name));
-
-        /* create response packet */
-        ret = sss_packet_new(cctx->creq, 0,
-                             sss_packet_get_cmd(cctx->creq->in),
-                             &cctx->creq->out);
-        if (ret != EOK) {
-            NSS_CMD_FATAL_ERROR(cctx);
-        }
-        ret = fill_pwent(cctx->creq->out,
-                         dctx->domain,
-                         nctx, false,
-                         res->msgs, res->count);
-        if (ret == ENOENT) {
-            ret = fill_empty(cctx->creq->out);
+        /* if this is a caching provider (or if we haven't checked the cache
+         * yet) then verify that the cache is uptodate */
+        if (dctx->check_provider) {
+            ret = check_cache(dctx, nctx, dctx->res,
+                              SSS_DP_USER, name, 0,
+                              nss_cmd_getpwnam_dp_callback);
+            if (ret != EOK) {
+                /* Anything but EOK means we should reenter the mainloop
+                 * because we may be refreshing the cache
+                 */
+                return ret;
+            }
         }
-        sss_packet_set_error(cctx->creq->out, ret);
 
-        break;
+        /* One result found */
+        DEBUG(6, ("Returning info for user [%s@%s]\n", name, dom->name));
 
-    default:
-        DEBUG(1, ("getpwnam call returned more than one result !?!\n"));
-        ret = nss_cmd_send_error(cmdctx, ENOENT);
-        if (ret != EOK) {
-            NSS_CMD_FATAL_ERROR(cctx);
-        }
+        return EOK;
     }
 
-    sss_cmd_done(cctx, cmdctx);
+    DEBUG(2, ("No matching domain found for [%s], fail!\n", name));
+    return ENOENT;
 }
 
 static void nss_cmd_getpwnam_dp_callback(uint16_t err_maj, uint32_t err_min,
@@ -556,7 +600,6 @@ static void nss_cmd_getpwnam_dp_callback(uint16_t err_maj, uint32_t err_min,
     struct nss_dom_ctx *dctx = talloc_get_type(ptr, struct nss_dom_ctx);
     struct nss_cmd_ctx *cmdctx = dctx->cmdctx;
     struct cli_ctx *cctx = cmdctx->cctx;
-    struct sysdb_ctx *sysdb;
     int ret;
 
     if (err_maj) {
@@ -565,39 +608,33 @@ static void nss_cmd_getpwnam_dp_callback(uint16_t err_maj, uint32_t err_min,
                   "Will try to return what we have in cache\n",
                   (unsigned int)err_maj, (unsigned int)err_min, err_msg));
 
-        if (!dctx->res) {
-            /* return 0 results */
-            dctx->res = talloc_zero(dctx, struct ldb_result);
-            if (!dctx->res) {
-                ret = ENOMEM;
-                goto done;
-            }
+        if (dctx->res && dctx->res->count == 1) {
+            ret = nss_cmd_getpw_send_reply(dctx, false);
+            goto done;
         }
 
-        nss_cmd_getpwnam_callback(dctx, LDB_SUCCESS, dctx->res);
-        return;
+        /* no previous results, just loop to next domain if possible */
+        if (dctx->domain->next && cmdctx->check_next) {
+            dctx->domain = dctx->domain->next;
+            dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
+        } else {
+            /* nothing vailable */
+            ret = ENOENT;
+            goto done;
+        }
     }
 
-    ret = sysdb_get_ctx_from_list(cctx->rctx->db_list,
-                                  dctx->domain, &sysdb);
-    if (ret != EOK) {
-        DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
-        NSS_CMD_FATAL_ERROR(cctx);
+    /* ok the backend returned, search to see if we have updated results */
+    ret = nss_cmd_getpwnam_search(dctx);
+    if (ret == EOK) {
+        /* we have results to return */
+        ret = nss_cmd_getpw_send_reply(dctx, false);
     }
-    ret = sysdb_getpwnam(cmdctx, sysdb,
-                         dctx->domain, cmdctx->name,
-                         nss_cmd_getpwnam_callback, dctx);
 
 done:
-    if (ret != EOK) {
-        DEBUG(1, ("Failed to make request to our cache! (%d [%s])\n",
-                  ret, strerror(ret)));
-
-        ret = nss_cmd_send_error(cmdctx, ret);
-        if (ret != EOK) {
-            NSS_CMD_FATAL_ERROR(cctx);
-        }
-        sss_cmd_done(cctx, cmdctx);
+    ret = nss_cmd_done(cmdctx, ret);
+    if (ret) {
+        NSS_CMD_FATAL_ERROR(cctx);
     }
 }
 
@@ -605,18 +642,11 @@ static int nss_cmd_getpwnam(struct cli_ctx *cctx)
 {
     struct nss_cmd_ctx *cmdctx;
     struct nss_dom_ctx *dctx;
-    struct sss_domain_info *dom;
-    struct sysdb_ctx *sysdb;
-    struct nss_ctx *nctx;
     const char *rawname;
     char *domname;
     uint8_t *body;
     size_t blen;
     int ret;
-    int ncret;
-    bool neghit = false;
-
-    nctx = talloc_get_type(cctx->rctx->pvt_ctx, struct nss_ctx);
 
     cmdctx = talloc_zero(cctx, struct nss_cmd_ctx);
     if (!cmdctx) {
@@ -659,92 +689,23 @@ static int nss_cmd_getpwnam(struct cli_ctx *cctx)
             ret = ENOENT;
             goto done;
         }
-
-        /* verify this user has not yet been negatively cached,
-         * or has been permanently filtered */
-        ncret = nss_ncache_check_user(nctx->ncache, nctx->neg_timeout,
-                                      dctx->domain->name, cmdctx->name);
-        if (ncret == EEXIST) {
-            neghit = true;
-        }
-    }
-    else {
-        /* skip domains that require FQnames or have negative caches */
-        for (dom = cctx->rctx->domains; dom; dom = dom->next) {
-
-            if (dom->fqnames) continue;
-
-            /* verify this user has not yet been negatively cached,
-            * or has been permanently filtered */
-            ncret = nss_ncache_check_user(nctx->ncache, nctx->neg_timeout,
-                                          dom->name, cmdctx->name);
-            if (ncret == ENOENT) break;
-
-            neghit = true;
-        }
-        /* reset neghit if we still have a domain to check */
-        if (dom) neghit = false;
-
-        dctx->domain = dom;
-    }
-    if (neghit) {
-        DEBUG(2, ("User [%s] does not exist! (negative cache)\n", rawname));
-        ret = ENOENT;
-        goto done;
-    }
-    if (dctx->domain == NULL) {
-        DEBUG(2, ("No matching domain found for [%s], fail!\n", rawname));
-        ret = ENOENT;
-        goto done;
-    }
-
-    dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
-
-    if (!domname) {
+    } else {
         /* this is a multidomain search */
+        dctx->domain = cctx->rctx->domains;
         cmdctx->check_next = true;
     }
 
-    DEBUG(4, ("Requesting info for [%s@%s]\n",
-              cmdctx->name, dctx->domain->name));
+    dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
 
-    ret = sysdb_get_ctx_from_list(cctx->rctx->db_list,
-                                  dctx->domain, &sysdb);
-    if (ret != EOK) {
-        DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
-        ret = EFAULT;
-        goto done;
-    }
-    ret = sysdb_getpwnam(cmdctx, sysdb,
-                         dctx->domain, cmdctx->name,
-                         nss_cmd_getpwnam_callback, dctx);
-    if (ret != EOK) {
-        DEBUG(1, ("Failed to make request to our cache!\n"));
+    /* ok, find it ! */
+    ret = nss_cmd_getpwnam_search(dctx);
+    if (ret == EOK) {
+        /* we have results to return */
+        ret = nss_cmd_getpw_send_reply(dctx, false);
     }
 
 done:
-    if (ret != EOK) {
-        if (ret == ENOENT) {
-            /* we do not have any entry to return */
-            ret = sss_packet_new(cctx->creq, 2*sizeof(uint32_t),
-                                 sss_packet_get_cmd(cctx->creq->in),
-                                 &cctx->creq->out);
-            if (ret == EOK) {
-                sss_packet_get_body(cctx->creq->out, &body, &blen);
-                ((uint32_t *)body)[0] = 0; /* 0 results */
-                ((uint32_t *)body)[1] = 0; /* reserved */
-            }
-        }
-        if (ret != EOK) {
-            ret = nss_cmd_send_error(cmdctx, ret);
-        }
-        if (ret == EOK) {
-            sss_cmd_done(cctx, cmdctx);
-        }
-        return ret;
-    }
-
-    return EOK;
+    return nss_cmd_done(cmdctx, ret);
 }
 
 static void nss_cmd_getpwuid_dp_callback(uint16_t err_maj, uint32_t err_min,
diff --git a/src/responder/pam/pamsrv.h b/src/responder/pam/pamsrv.h
index 60f9c66a..1a81fb70 100644
--- a/src/responder/pam/pamsrv.h
+++ b/src/responder/pam/pamsrv.h
@@ -44,6 +44,7 @@ struct pam_auth_req {
 
     pam_dp_callback_t *callback;
 
+    struct ldb_result *res;
     bool check_provider;
     void *data;
 };
diff --git a/src/responder/pam/pamsrv_cmd.c b/src/responder/pam/pamsrv_cmd.c
index eba78cce..d5b4eff6 100644
--- a/src/responder/pam/pamsrv_cmd.c
+++ b/src/responder/pam/pamsrv_cmd.c
@@ -564,8 +564,8 @@ static void pam_cache_auth_done(struct pam_auth_req *preq, int ret,
 
 static void pam_check_user_dp_callback(uint16_t err_maj, uint32_t err_min,
                                        const char *err_msg, void *ptr);
-static void pam_check_user_callback(void *ptr, int status,
-                                    struct ldb_result *res);
+static int pam_check_user_search(struct pam_auth_req *preq);
+static int pam_check_user_done(struct pam_auth_req *preq, int ret);
 static void pam_dom_forwarder(struct pam_auth_req *preq);
 
 /* TODO: we should probably return some sort of cookie that is set in the
@@ -575,12 +575,10 @@ static void pam_dom_forwarder(struct pam_auth_req *preq);
 static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
 {
     struct sss_domain_info *dom;
-    struct sysdb_ctx *sysdb;
     struct pam_auth_req *preq;
     struct pam_data *pd;
     uint8_t *body;
     size_t blen;
-    int timeout;
     int ret;
     uint32_t terminator = SSS_END_OF_PAM_REQUEST;
     preq = talloc_zero(cctx, struct pam_auth_req);
@@ -663,267 +661,168 @@ static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
         goto done;
     }
 
-    /* When auth is requested always search the provider first,
-     * do not rely on cached data unless the provider is completely
-     * offline */
-    if (NEED_CHECK_PROVIDER(preq->domain->provider) &&
-        (pam_cmd == SSS_PAM_AUTHENTICATE || pam_cmd == SSS_PAM_SETCRED)) {
-
-        /* no need to re-check later on */
-        preq->check_provider = false;
-        timeout = SSS_CLI_SOCKET_TIMEOUT/2;
-
-        ret = sss_dp_send_acct_req(preq->cctx->rctx, preq,
-                                   pam_check_user_dp_callback, preq,
-                                   timeout, preq->domain->name,
-                                   false, SSS_DP_INITGROUPS,
-                                   preq->pd->user, 0);
-    }
-    else {
-        preq->check_provider = NEED_CHECK_PROVIDER(preq->domain->provider);
-
-        ret = sysdb_get_ctx_from_list(cctx->rctx->db_list,
-                                      preq->domain, &sysdb);
-        if (ret != EOK) {
-            DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
-            goto done;
-        }
-        ret = sysdb_getpwnam(preq, sysdb,
-                             preq->domain, preq->pd->user,
-                             pam_check_user_callback, preq);
+    ret = pam_check_user_search(preq);
+    if (ret == EOK) {
+        pam_dom_forwarder(preq);
     }
 
 done:
-    if (ret != EOK) {
-        switch (ret) {
-        case ENOENT:
-            pd->pam_status = PAM_USER_UNKNOWN;
-        default:
-            pd->pam_status = PAM_SYSTEM_ERR;
-        }
-        pam_reply(preq);
-    }
-    return EOK;
+    return pam_check_user_done(preq, ret);
 }
 
-static void pam_check_user_dp_callback(uint16_t err_maj, uint32_t err_min,
-                                       const char *err_msg, void *ptr)
+static int pam_check_user_search(struct pam_auth_req *preq)
 {
-    struct pam_auth_req *preq = talloc_get_type(ptr, struct pam_auth_req);
+    struct sss_domain_info *dom = preq->domain;
+    struct cli_ctx *cctx = preq->cctx;
+    const char *name = preq->pd->user;
     struct sysdb_ctx *sysdb;
+    time_t cacheExpire;
     int ret;
 
-    if (err_maj) {
-        DEBUG(2, ("Unable to get information from Data Provider\n"
-                  "Error: %u, %u, %s\n",
-                  (unsigned int)err_maj, (unsigned int)err_min, err_msg));
-    }
+    while (dom) {
+       /* if it is a domainless search, skip domains that require fully
+         * qualified names instead */
+        while (dom && !preq->pd->domain && dom->fqnames) {
+            dom = dom->next;
+        }
 
-    /* always try to see if we have the user in cache even if the provider
-     * returned an error */
-    ret = sysdb_get_ctx_from_list(preq->cctx->rctx->db_list,
-                                  preq->domain, &sysdb);
-    if (ret != EOK) {
-        DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
-        goto done;
-    }
-    ret = sysdb_getpwnam(preq, sysdb,
-                         preq->domain, preq->pd->user,
-                         pam_check_user_callback, preq);
+        if (!dom) break;
 
-done:
-    if (ret != EOK) {
-        preq->pd->pam_status = PAM_SYSTEM_ERR;
-        pam_reply(preq);
-    }
-}
+        if (dom != preq->domain) {
+            /* make sure we reset the check_provider flag when we check
+             * a new domain */
+            preq->check_provider = NEED_CHECK_PROVIDER(dom->provider);
+        }
 
-static void pam_check_user_callback(void *ptr, int status,
-                                    struct ldb_result *res)
-{
-    struct pam_auth_req *preq = talloc_get_type(ptr, struct pam_auth_req);
-    struct sss_domain_info *dom;
-    struct sysdb_ctx *sysdb;
-    uint64_t cacheExpire;
-    bool call_provider = false;
-    time_t timeout;
-    int ret;
+        /* make sure to update the preq if we changed domain */
+        preq->domain = dom;
 
-    if (status != LDB_SUCCESS) {
-        preq->pd->pam_status = PAM_SYSTEM_ERR;
-        pam_reply(preq);
-        return;
-    }
+        /* TODO: check negative cache ? */
 
-    timeout = SSS_CLI_SOCKET_TIMEOUT/2;
+        /* Always try to refresh the cache first on authentication */
+        if (preq->check_provider &&
+            (preq->pd->cmd == SSS_PAM_AUTHENTICATE ||
+             preq->pd->cmd == SSS_PAM_SETCRED)) {
 
-    if (preq->check_provider) {
-        switch (res->count) {
-        case 0:
-            call_provider = true;
+            /* call provider first */
             break;
+        }
 
-        case 1:
-            cacheExpire = ldb_msg_find_attr_as_uint64(res->msgs[0],
+        DEBUG(4, ("Requesting info for [%s@%s]\n", name, dom->name));
+
+        ret = sysdb_get_ctx_from_list(cctx->rctx->db_list, dom, &sysdb);
+        if (ret != EOK) {
+            DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
+            preq->pd->pam_status = PAM_SYSTEM_ERR;
+            return EFAULT;
+        }
+        ret = sysdb_getpwnam(preq, sysdb, dom, name, &preq->res);
+        if (ret != EOK) {
+            DEBUG(1, ("Failed to make request to our cache!\n"));
+            return EIO;
+        }
+
+        if (preq->res->count > 1) {
+            DEBUG(0, ("getpwnam call returned more than one result !?!\n"));
+            return ENOENT;
+        }
+
+        if (preq->res->count == 0) {
+            /* if a multidomain search, try with next */
+            if (!preq->pd->domain) {
+                dom = dom->next;
+                continue;
+            }
+
+            DEBUG(2, ("No results for getpwnam call\n"));
+
+            /* TODO: store negative cache ? */
+
+            return ENOENT;
+        }
+
+        /* One result found */
+
+        /* if we need to check the remote account go on */
+        if (preq->check_provider) {
+            cacheExpire = ldb_msg_find_attr_as_uint64(preq->res->msgs[0],
                                                       SYSDB_CACHE_EXPIRE, 0);
             if (cacheExpire < time(NULL)) {
-                call_provider = true;
+                break;
             }
-            break;
-
-        default:
-            DEBUG(1, ("check user call returned more than one result !?!\n"));
-            preq->pd->pam_status = PAM_SYSTEM_ERR;
-            pam_reply(preq);
-            return;
         }
+
+        DEBUG(6, ("Returning info for user [%s@%s]\n", name, dom->name));
+
+        return EOK;
     }
 
-    if (call_provider) {
+    if (preq->check_provider) {
 
         /* dont loop forever :-) */
         preq->check_provider = false;
 
-        /* keep around current data in case backend is offline */
-        if (res->count) {
-            preq->data = talloc_steal(preq, res);
-        }
-
         ret = sss_dp_send_acct_req(preq->cctx->rctx, preq,
                                    pam_check_user_dp_callback, preq,
-                                   timeout, preq->domain->name,
-                                   false, SSS_DP_USER,
-                                   preq->pd->user, 0);
+                                   SSS_CLI_SOCKET_TIMEOUT/2,
+                                   dom->name, false, SSS_DP_USER, name, 0);
         if (ret != EOK) {
             DEBUG(3, ("Failed to dispatch request: %d(%s)\n",
                       ret, strerror(ret)));
             preq->pd->pam_status = PAM_SYSTEM_ERR;
-            pam_reply(preq);
+            return EIO;
         }
-        return;
+        /* tell caller we are in an async call */
+        return EAGAIN;
     }
 
-    switch (res->count) {
-    case 0:
-        if (!preq->pd->domain) {
-            /* search next as the domain was unknown */
-
-            ret = EOK;
-
-            /* skip domains that require FQnames or have negative caches */
-            for (dom = preq->domain->next; dom; dom = dom->next) {
-
-                if (dom->fqnames) continue;
-
-#if HAVE_NEG_CACHE
-                ncret = nss_ncache_check_user(nctx->ncache,
-                                              nctx->neg_timeout,
-                                              dom->name, cmdctx->name);
-                if (ncret == ENOENT) break;
-
-                neghit = true;
-#endif
-                break;
-            }
-#if HAVE_NEG_CACHE
-            /* reset neghit if we still have a domain to check */
-            if (dom) neghit = false;
-
-           if (neghit) {
-                DEBUG(2, ("User [%s] does not exist! (negative cache)\n",
-                          cmdctx->name));
-                ret = ENOENT;
-            }
-#endif
-            if (dom == NULL) {
-                DEBUG(2, ("No matching domain found for [%s], fail!\n",
-                          preq->pd->user));
-                ret = ENOENT;
-            }
+    DEBUG(2, ("No matching domain found for [%s], fail!\n", name));
+    return ENOENT;
+}
 
-            if (ret == EOK) {
-                preq->domain = dom;
-                preq->data = NULL;
-
-                DEBUG(4, ("Requesting info for [%s@%s]\n",
-                          preq->pd->user, preq->domain->name));
-
-                /* When auth is requested always search the provider first,
-                 * do not rely on cached data unless the provider is
-                 * completely offline */
-                if (NEED_CHECK_PROVIDER(preq->domain->provider) &&
-                    (preq->pd->cmd == SSS_PAM_AUTHENTICATE ||
-                     preq->pd->cmd == SSS_PAM_SETCRED)) {
-
-                    /* no need to re-check later on */
-                    preq->check_provider = false;
-
-                    ret = sss_dp_send_acct_req(preq->cctx->rctx, preq,
-                                               pam_check_user_dp_callback,
-                                               preq, timeout,
-                                               preq->domain->name,
-                                               false, SSS_DP_USER,
-                                               preq->pd->user, 0);
-                }
-                else {
-                    preq->check_provider = NEED_CHECK_PROVIDER(preq->domain->provider);
+static int pam_check_user_done(struct pam_auth_req *preq, int ret)
+{
+    switch (ret) {
+    case EOK:
+        break;
 
-                    ret = sysdb_get_ctx_from_list(preq->cctx->rctx->db_list,
-                                                  preq->domain, &sysdb);
-                    if (ret != EOK) {
-                        DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
-                        preq->pd->pam_status = PAM_SYSTEM_ERR;
-                        pam_reply(preq);
-                        return;
-                    }
-                    ret = sysdb_getpwnam(preq, sysdb,
-                                         preq->domain, preq->pd->user,
-                                         pam_check_user_callback, preq);
-                }
-                if (ret != EOK) {
-                    DEBUG(1, ("Failed to make request to our cache!\n"));
-                }
-            }
+    case EAGAIN:
+        /* performing async request, just return */
+        break;
 
-            /* we made another call, end here */
-            if (ret == EOK) return;
-        }
-        else {
-            ret = ENOENT;
-        }
+    case ENOENT:
+        preq->pd->pam_status = PAM_USER_UNKNOWN;
+        pam_reply(preq);
+        break;
 
-        DEBUG(2, ("No results for check user call\n"));
+    default:
+        preq->pd->pam_status = PAM_SYSTEM_ERR;
+        pam_reply(preq);
+        break;
+    }
 
-#if HAVE_NEG_CACHE
-        /* set negative cache only if not result of cache check */
-        if (!neghit) {
-            ret = nss_ncache_set_user(nctx->ncache, false,
-                                      dctx->domain->name, cmdctx->name);
-            if (ret != EOK) {
-                NSS_CMD_FATAL_ERROR(cctx);
-            }
-        }
-#endif
+    return EOK;
+}
 
-        if (ret != EOK) {
-            if (ret == ENOENT) {
-                preq->pd->pam_status = PAM_USER_UNKNOWN;
-            } else {
-                preq->pd->pam_status = PAM_SYSTEM_ERR;
-            }
-            pam_reply(preq);
-            return;
-        }
-        break;
+static void pam_check_user_dp_callback(uint16_t err_maj, uint32_t err_min,
+                                       const char *err_msg, void *ptr)
+{
+    struct pam_auth_req *preq = talloc_get_type(ptr, struct pam_auth_req);
+    int ret;
 
-    case 1:
+    if (err_maj) {
+        DEBUG(2, ("Unable to get information from Data Provider\n"
+                  "Error: %u, %u, %s\n",
+                  (unsigned int)err_maj, (unsigned int)err_min, err_msg));
+    }
 
-        /* BINGO */
+    ret = pam_check_user_search(preq);
+    if (ret == EOK) {
         pam_dom_forwarder(preq);
-        return;
+    }
 
-    default:
-        DEBUG(1, ("check user call returned more than one result !?!\n"));
+    ret = pam_check_user_done(preq, ret);
+    if (ret) {
         preq->pd->pam_status = PAM_SYSTEM_ERR;
         pam_reply(preq);
     }