server/protocol: option for dynamic authorization of client permissions

problem:
assuming gluster volume is already mounted (for gfapi: say client transport
connection has already established), now if somebody change the volume
permissions say *.allow | *.reject for a client, gluster should allow/terminate
the client connection based on the fresh set of volume options immediately,
but in existing scenario neither we have any option to set this behaviour nor
we take any action until and unless we remount the volume manually

solution:
Introduce 'dynamic-auth' option (default: on).
If 'dynamic-auth' is 'on' gluster will perform dynamic authentication to
allow/terminate client transport connection immediately in response to
*.allow | *.reject volume set options, thus if volume permissions have changed
for a particular client (say client is added to auth.reject list), his
transport connection to gluster volume will be terminated immediately.

Change-Id: I6243a6db41bf1e0babbf050a8e4f8620732e00d8
BUG: 1245380
Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>
Reviewed-on: http://review.gluster.org/12229
Tested-by: NetBSD Build System <jenkins@build.gluster.org>
Reviewed-by: Raghavendra G <rgowdapp@redhat.com>

3 files changed, 57 insertions, 4 deletions

diff --git a/xlators/protocol/server/src/server-handshake.c b/xlators/protocol/server/src/server-handshake.c
index 40cc684e1ba..62d9368e33a 100644
--- a/xlators/protocol/server/src/server-handshake.c
+++ b/xlators/protocol/server/src/server-handshake.c
@@ -598,6 +598,8 @@ server_setvolume (rpcsvc_request_t *req)
                                conf->auth_modules);
 
         if (ret == AUTH_ACCEPT) {
+                /* Store options received from client side */
+                req->trans->clnt_options = dict_ref(params);
 
                 gf_msg (this->name, GF_LOG_INFO, 0, PS_MSG_CLIENT_ACCEPTED,
                         "accepted client from %s (version: %s)",
diff --git a/xlators/protocol/server/src/server.c b/xlators/protocol/server/src/server.c
index a98b609da39..bcfa1f3fe0f 100644
--- a/xlators/protocol/server/src/server.c
+++ b/xlators/protocol/server/src/server.c
@@ -710,6 +710,7 @@ reconfigure (xlator_t *this, dict_t *options)
         server_conf_t            *conf =NULL;
         rpcsvc_t                 *rpc_conf;
         rpcsvc_listener_t        *listeners;
+        rpc_transport_t          *xprt = NULL;
         int                       inode_lru_limit;
         gf_boolean_t              trace;
         data_t                   *data;
@@ -778,6 +779,7 @@ reconfigure (xlator_t *this, dict_t *options)
                 /* logging already done in validate_auth_options function. */
                 goto out;
         }
+
         dict_foreach (this->options, _delete_auth_opt, this->options);
         dict_foreach (options, _copy_auth_opt, this->options);
 
@@ -805,8 +807,41 @@ reconfigure (xlator_t *this, dict_t *options)
                 goto out;
         }
 
-        (void) rpcsvc_set_allow_insecure (rpc_conf, options);
-        (void) rpcsvc_set_root_squash (rpc_conf, options);
+        ret = rpcsvc_auth_reconf (rpc_conf, options);
+        if (ret == -1) {
+                gf_log (GF_RPCSVC, GF_LOG_ERROR,
+                                "Failed to reconfigure authentication");
+                goto out;
+        }
+
+        GF_OPTION_RECONF ("dynamic-auth", conf->dync_auth, options,
+                        bool, out);
+
+        if (conf->dync_auth) {
+                pthread_mutex_lock (&conf->mutex);
+                {
+                        list_for_each_entry (xprt, &conf->xprt_list, list) {
+                                /* check for client authorization */
+                                ret = gf_authenticate (xprt->clnt_options,
+                                                options, conf->auth_modules);
+                                if (ret == AUTH_ACCEPT) {
+                                        gf_msg (this->name, GF_LOG_TRACE, 0,
+                                               PS_MSG_CLIENT_ACCEPTED,
+                                               "authorized client, hence we "
+                                               "continue with this connection");
+                                } else {
+                                        gf_msg (this->name, GF_LOG_INFO,
+                                                EACCES,
+                                                PS_MSG_AUTHENTICATE_ERROR,
+                                                "unauthorized client, hence "
+                                                "terminating the connection %s",
+                                                xprt->peerinfo.identifier);
+                                        rpc_transport_disconnect(xprt);
+                                }
+                        }
+                }
+                pthread_mutex_unlock (&conf->mutex);
+        }
 
         ret = rpcsvc_set_outstanding_rpc_limit (rpc_conf, options,
                                          RPCSVC_DEFAULT_OUTSTANDING_RPC_LIMIT);
@@ -957,6 +992,12 @@ init (xlator_t *this)
                         "Failed to initialize group cache.");
                 goto out;
         }
+        ret = dict_get_str_boolean (this->options, "dynamic-auth",
+                        _gf_true);
+        if (ret == -1)
+                conf->dync_auth = _gf_true;
+        else
+                conf->dync_auth = ret;
 
         /* RPC related */
         conf->rpc = rpcsvc_init (this, this->ctx, this->options, 0);
@@ -1364,7 +1405,6 @@ struct volume_options options[] = {
                          "requests from a client. 0 means no limit (can "
                          "potentially run out of memory)"
         },
-
         { .key   = {"manage-gids"},
           .type  = GF_OPTION_TYPE_BOOL,
           .default_value = "off",
@@ -1385,6 +1425,13 @@ struct volume_options options[] = {
                          " responses faster, depending on available processing"
                          " power. Range 1-32 threads."
         },
-
+        { .key   = {"dynamic-auth"},
+          .type  = GF_OPTION_TYPE_BOOL,
+          .default_value = "on",
+          .description   = "When 'on' perform dynamic authentication of volume "
+                           "options in order to allow/terminate client "
+                           "transport connection immediately in response to "
+                           "*.allow | *.reject volume set options."
+        },
         { .key   = {NULL} },
 };
diff --git a/xlators/protocol/server/src/server.h b/xlators/protocol/server/src/server.h
index dd80ab75f60..ccd2b232207 100644
--- a/xlators/protocol/server/src/server.h
+++ b/xlators/protocol/server/src/server.h
@@ -68,6 +68,10 @@ struct server_conf {
                                                 * configured */
 
         gf_boolean_t            parent_up;
+        gf_boolean_t            dync_auth; /* if set authenticate dynamically,
+                                            * in case if volume set options
+                                            * (say *.allow | *.reject) are
+                                            * tweeked */
 };
 typedef struct server_conf server_conf_t;