Change data provider into a hub, where backends (ldap, nis, ipa providers)

and frontends (pam, nss, ... modules) can connect to.

10 files changed, 824 insertions, 186 deletions

diff --git a/server/Makefile.in b/server/Makefile.in
index 4c989ee..fa57d80 100644
--- a/server/Makefile.in
+++ b/server/Makefile.in
@@ -59,7 +59,7 @@ OBJS = $(SERVER_OBJ) @LIBREPLACEOBJ@ $(EXTRA_OBJ)
 
 headers = .h
 
-BINS = sbin/sssd sbin/sssd_nss sbin/sssd_dp
+BINS = sbin/sssd sbin/sssd_nss sbin/sssd_dp sbin/sssd_be
 
 DIRS = sbin
 
diff --git a/server/monitor.c b/server/monitor.c
index fab88ff..0075aac 100644
--- a/server/monitor.c
+++ b/server/monitor.c
@@ -304,6 +304,7 @@ int monitor_process_init(TALLOC_CTX *mem_ctx,
 {
     struct mt_ctx *ctx;
     struct mt_svc *svc;
+    char **doms;
     char *path;
     int ret, i;
 
@@ -327,6 +328,7 @@ int monitor_process_init(TALLOC_CTX *mem_ctx,
         return ret;
     }
 
+    /* start all services */
     for (i = 0; ctx->services[i]; i++) {
 
         svc = talloc_zero(ctx, struct mt_svc);
@@ -363,6 +365,58 @@ int monitor_process_init(TALLOC_CTX *mem_ctx,
         set_tasks_checker(svc);
     }
 
+    /* now start the data providers */
+    ret = confdb_get_domains(cdb, ctx, &doms);
+    if (ret != EOK) {
+        DEBUG(2, ("No domains configured. LOCAL should always exist!\n"));
+        return ret;
+    }
+
+    for (i = 0; doms[i]; i++) {
+        svc = talloc_zero(ctx, struct mt_svc);
+        if (!svc) {
+            talloc_free(ctx);
+            return ENOMEM;
+        }
+        svc->name = talloc_strdup(svc, doms[i]);
+        svc->mt_ctx = ctx;
+
+        path = talloc_asprintf(svc, "config/domains/%s", svc->name);
+        if (!path) {
+            talloc_free(ctx);
+            return ENOMEM;
+        }
+        ret = confdb_get_string(cdb, svc, path,
+                                "command", NULL, &svc->command);
+        if (ret != EOK) {
+            DEBUG(0, ("Failed to find provider [%s] configuration\n",
+                  svc->name));
+            talloc_free(svc);
+            continue;
+        }
+
+        /* if no command is present to not run the domain */
+        if (svc->command == NULL) {
+            /* the LOCAL domain does not need a backend at the moment */
+            if (strcasecmp(svc->name, "LOCAL") != 0) {
+                DEBUG(0, ("Missing command to run provider [%s]\n"));
+            }
+            talloc_free(svc);
+            continue;
+        }
+
+        ret = start_service(svc->name, svc->command, &svc->pid);
+        if (ret != EOK) {
+            DEBUG(0,("Failed to start provider '%s'\n", svc->name));
+            talloc_free(svc);
+            continue;
+        }
+
+        DLIST_ADD(ctx->svc_list, svc);
+
+        set_tasks_checker(svc);
+    }
+
     return EOK;
 }
 
diff --git a/server/nss/nsssrv.c b/server/nss/nsssrv.c
index ccbd7ba..a3fd672 100644
--- a/server/nss/nsssrv.c
+++ b/server/nss/nsssrv.c
@@ -43,14 +43,14 @@
 
 #define SSS_NSS_PIPE_NAME "nss"
 
-static int provide_identity(DBusMessage *message, void *data, DBusMessage **r);
-static int reply_ping(DBusMessage *message, void *data, DBusMessage **r);
+static int service_identity(DBusMessage *message, void *data, DBusMessage **r);
+static int service_pong(DBusMessage *message, void *data, DBusMessage **r);
 static int nss_init_domains(struct nss_ctx *nctx);
 static int _domain_comparator(void *key1, void *key2);
 
 struct sbus_method nss_sbus_methods[] = {
-    {SERVICE_METHOD_IDENTITY, provide_identity},
-    {SERVICE_METHOD_PING, reply_ping},
+    {SERVICE_METHOD_IDENTITY, service_identity},
+    {SERVICE_METHOD_PING, service_pong},
     {NULL, NULL}
 };
 
@@ -211,7 +211,7 @@ static void accept_fd_handler(struct event_context *ev,
     return;
 }
 
-static int provide_identity(DBusMessage *message, void *data, DBusMessage **r)
+static int service_identity(DBusMessage *message, void *data, DBusMessage **r)
 {
     dbus_uint16_t version = NSS_SBUS_SERVICE_VERSION;
     const char *name = NSS_SBUS_SERVICE_NAME;
@@ -231,7 +231,7 @@ static int provide_identity(DBusMessage *message, void *data, DBusMessage **r)
     return EOK;
 }
 
-static int reply_ping(DBusMessage *message, void *data, DBusMessage **r)
+static int service_pong(DBusMessage *message, void *data, DBusMessage **r)
 {
     DBusMessage *reply;
     dbus_bool_t ret;
@@ -252,8 +252,7 @@ static int nss_sbus_init(struct nss_ctx *nctx)
 
     /* Set up SBUS connection to the monitor */
     ss_ctx = sssd_service_sbus_init(nctx, nctx->ev, nctx->cdb,
-                                    provide_identity,
-                                    reply_ping);
+                                    nss_sbus_methods);
     if (ss_ctx == NULL) {
         DEBUG(0, ("Could not initialize D-BUS.\n"));
         return ENOMEM;
diff --git a/server/providers/data_provider.c b/server/providers/data_provider.c
index bfc37a7..181e865 100644
--- a/server/providers/data_provider.c
+++ b/server/providers/data_provider.c
@@ -41,16 +41,57 @@
 #include "data_provider.h"
 #include "util/service_helpers.h"
 
-static int provide_identity(DBusMessage *message, void *data, DBusMessage **r);
-static int reply_ping(DBusMessage *message, void *data, DBusMessage **r);
+struct dp_backend;
+struct dp_frontend;
+
+struct dp_ctx {
+    struct event_context *ev;
+    struct confdb_ctx *cdb;
+    struct ldb_context *ldb;
+    struct service_sbus_ctx *ss_ctx;
+    struct dp_backend *be_list;
+    struct dp_frontend *fe_list;
+};
+
+struct dp_client {
+    struct dp_ctx *dpctx;
+    struct sbus_conn_ctx *conn_ctx;
+    const char *domain;
+};
+
+struct dp_backend {
+    struct dp_backend *prev;
+    struct dp_backend *next;
+    char *name;
+    char *domain;
+    struct dp_client *dpcli;
+};
+
+struct dp_frontend {
+    struct dp_frontend *prev;
+    struct dp_frontend *next;
+    char *name;
+    uint16_t flags;
+    struct dp_client *dpcli;
+};
+
+static int dp_backend_destructor(void *ctx);
+static int dp_frontend_destructor(void *ctx);
+
+static int service_identity(DBusMessage *message, void *data, DBusMessage **r);
+static int service_pong(DBusMessage *message, void *data, DBusMessage **r);
 
 struct sbus_method mon_sbus_methods[] = {
-    {SERVICE_METHOD_IDENTITY, provide_identity},
-    {SERVICE_METHOD_PING, reply_ping},
+    {SERVICE_METHOD_IDENTITY, service_identity},
+    {SERVICE_METHOD_PING, service_pong},
     {NULL, NULL}
 };
 
-static int provide_identity(DBusMessage *message, void *data, DBusMessage **r)
+struct sbus_method dp_sbus_methods[] = {
+    {NULL, NULL}
+};
+
+static int service_identity(DBusMessage *message, void *data, DBusMessage **r)
 {
     dbus_uint16_t version = DATA_PROVIDER_VERSION;
     const char *name = DATA_PROVIDER_SERVICE_NAME;
@@ -70,7 +111,7 @@ static int provide_identity(DBusMessage *message, void *data, DBusMessage **r)
     return EOK;
 }
 
-static int reply_ping(DBusMessage *message, void *data, DBusMessage **r)
+static int service_pong(DBusMessage *message, void *data, DBusMessage **r)
 {
     DBusMessage *reply;
     dbus_bool_t ret;
@@ -91,8 +132,7 @@ static int dp_monitor_init(struct dp_ctx *dpctx)
 
     /* Set up SBUS connection to the monitor */
     ss_ctx = sssd_service_sbus_init(dpctx, dpctx->ev, dpctx->cdb,
-                                    provide_identity,
-                                    reply_ping);
+                                    mon_sbus_methods);
     if (ss_ctx == NULL) {
         DEBUG(0, ("Could not initialize D-BUS.\n"));
         return ENOMEM;
@@ -150,19 +190,18 @@ static int dp_db_init(struct dp_ctx *dpctx)
     return EOK;
 }
 
-static int check_online(DBusMessage *message, void *data, DBusMessage **r);
-
-struct sbus_method dp_sbus_methods[] = {
-    { DP_METHOD_CHECK_ONLINE, check_online },
-    { NULL, NULL }
-};
+static void identity_check(DBusPendingCall *pending, void *data);
+static void online_check(DBusPendingCall *pending, void *data);
 
 static int dbus_dp_init(struct sbus_conn_ctx *conn_ctx, void *data)
 {
     struct dp_ctx *dpctx;
     struct dp_client *dpcli;
+    DBusMessage *msg;
+    DBusPendingCall *pending_reply;
     DBusConnection *conn;
     DBusError dbus_error;
+    dbus_bool_t dbret;
 
     dpctx = talloc_get_type(data, struct dp_ctx);
     conn = sbus_get_connection(conn_ctx);
@@ -178,15 +217,186 @@ static int dbus_dp_init(struct sbus_conn_ctx *conn_ctx, void *data)
         return ENOMEM;
     }
     dpcli->dpctx = dpctx;
-    dpcli->conn = conn;
+    dpcli->conn_ctx = conn_ctx;
 
     /* Attach the client context to the connection context, so that it is
      * always available when we need to manage the connection. */
     sbus_conn_set_private_data(conn_ctx, dpcli);
 
+    /* identify the connecting client */
+    msg = dbus_message_new_method_call(NULL,
+                                       DP_CLI_PATH,
+                                       DP_CLI_INTERFACE,
+                                       DP_CLI_METHOD_IDENTITY);
+    if (msg == NULL) {
+        DEBUG(0,("Out of memory?!\n"));
+        talloc_free(conn_ctx);
+        return ENOMEM;
+    }
+    dbret = dbus_connection_send_with_reply(conn, msg, &pending_reply,
+                                            -1 /* TODO: set timeout */);
+    if (!dbret) {
+        /*
+         * Critical Failure
+         * We can't communicate on this connection
+         * We'll drop it using the default destructor.
+         */
+        DEBUG(0, ("D-BUS send failed.\n"));
+        talloc_free(conn_ctx);
+        return EIO;
+    }
+
+    /* Set up the reply handler */
+    dbus_pending_call_set_notify(pending_reply, identity_check, dpcli, NULL);
+    dbus_message_unref(msg);
+
     return EOK;
 }
 
+static void identity_check(DBusPendingCall *pending, void *data)
+{
+    struct dp_backend *dpbe;
+    struct dp_frontend *dpfe;
+    struct dp_client *dpcli;
+    DBusMessage *reply;
+    DBusConnection *conn;
+    DBusError dbus_error;
+    dbus_uint16_t cli_ver;
+    dbus_uint16_t cli_type;
+    char *cli_name;
+    char *cli_domain;
+    dbus_bool_t ret;
+    int type;
+
+    dpcli = talloc_get_type(data, struct dp_client);
+    conn = sbus_get_connection(dpcli->conn_ctx);
+    dbus_error_init(&dbus_error);
+
+    reply = dbus_pending_call_steal_reply(pending);
+    if (!reply) {
+        /* reply should never be null. This function shouldn't be called
+         * until reply is valid or timeout has occurred. If reply is NULL
+         * here, something is seriously wrong and we should bail out.
+         */
+        DEBUG(0, ("Serious error. A reply callback was called but no reply was received and no timeout occurred\n"));
+
+        /* Destroy this connection */
+        sbus_disconnect(dpcli->conn_ctx);
+        return;
+    }
+
+    type = dbus_message_get_type(reply);
+    switch (type) {
+    case DBUS_MESSAGE_TYPE_METHOD_RETURN:
+        ret = dbus_message_get_args(reply, &dbus_error,
+                                    DBUS_TYPE_UINT16, &cli_type,
+                                    DBUS_TYPE_UINT16, &cli_ver,
+                                    DBUS_TYPE_STRING, &cli_name,
+                                    DBUS_TYPE_STRING, &cli_domain,
+                                    DBUS_TYPE_INVALID);
+        if (!ret) {
+            DEBUG(1,("Failed, to parse message, killing connection\n"));
+            sbus_disconnect(dpcli->conn_ctx);
+            return;
+        }
+
+        switch (cli_type && DP_CLI_TYPE_MASK) {
+        case DP_CLI_BACKEND:
+            dpbe = talloc_zero(dpcli->dpctx, struct dp_backend);
+            if (!dpbe) {
+                DEBUG(0, ("Out of memory!\n"));
+                sbus_disconnect(dpcli->conn_ctx);
+                return;
+            }
+
+            dpbe->name = talloc_strdup(dpbe, cli_name);
+            dpbe->domain = talloc_strdup(dpbe, cli_domain);
+            if (!dpbe->name || !dpbe->domain) {
+                DEBUG(0, ("Out of memory!\n"));
+                sbus_disconnect(dpcli->conn_ctx);
+                return;
+            }
+
+            dpbe->dpcli = dpcli;
+
+            DLIST_ADD(dpcli->dpctx->be_list, dpbe);
+
+            talloc_set_destructor((TALLOC_CTX *)dpbe, dp_backend_destructor);
+            break;
+
+        case DP_CLI_FRONTEND:
+            dpfe = talloc_zero(dpcli->dpctx, struct dp_frontend);
+            if (!dpfe) {
+                DEBUG(0, ("Out of memory!\n"));
+                sbus_disconnect(dpcli->conn_ctx);
+                return;
+            }
+
+            dpfe->name = talloc_strdup(dpfe, cli_name);
+            if (!dpfe->name) {
+                DEBUG(0, ("Out of memory!\n"));
+                sbus_disconnect(dpcli->conn_ctx);
+                return;
+            }
+
+            dpfe->dpcli = dpcli;
+
+            DLIST_ADD(dpcli->dpctx->fe_list, dpfe);
+
+            talloc_set_destructor((TALLOC_CTX *)dpfe, dp_frontend_destructor);
+            break;
+
+        default:
+            DEBUG(1, ("Unknown client type, killing connection\n"));
+            sbus_disconnect(dpcli->conn_ctx);
+            return;
+        }
+
+        /* Set up the destructor for this service */
+        break;
+
+    case DBUS_MESSAGE_TYPE_ERROR:
+        DEBUG(0,("getIdentity returned an error [%s], closing connection.\n",
+                 dbus_message_get_error_name(reply)));
+        /* Falling through to default intentionally*/
+    default:
+        /*
+         * Timeout or other error occurred or something
+         * unexpected happened.
+         * It doesn't matter which, because either way we
+         * know that this connection isn't trustworthy.
+         * We'll destroy it now.
+         */
+        sbus_disconnect(dpcli->conn_ctx);
+        return;
+    }
+}
+
+static void online_check(DBusPendingCall *pending, void *data)
+{
+    return;
+}
+
+static int dp_backend_destructor(void *ctx)
+{
+    struct dp_backend *dpbe = talloc_get_type(ctx, struct dp_backend);
+    if (dpbe->dpcli && dpbe->dpcli &&
+        dpbe->dpcli->dpctx && dpbe->dpcli->dpctx->be_list) {
+        DLIST_REMOVE(dpbe->dpcli->dpctx->be_list, dpbe);
+    }
+    return 0;
+}
+
+static int dp_frontend_destructor(void *ctx)
+{
+    struct dp_frontend *dpfe = talloc_get_type(ctx, struct dp_frontend);
+    if (dpfe->dpcli && dpfe->dpcli &&
+        dpfe->dpcli->dpctx && dpfe->dpcli->dpctx->fe_list) {
+        DLIST_REMOVE(dpfe->dpcli->dpctx->fe_list, dpfe);
+    }
+    return 0;
+}
+
 /* monitor_dbus_init
  * Set up the monitor service as a D-BUS Server */
 static int dp_srv_init(struct dp_ctx *dpctx)
@@ -247,116 +457,6 @@ done:
     return ret;
 }
 
-static int check_online(DBusMessage *message, void *data, DBusMessage **r)
-{
-    return EOK;
-}
-
-/* find list of backends */
-/* find library implementing them */
-/* dload() said library and set up a structure to hold pointers */
-
-static int init_data_providers(struct dp_ctx *dpctx)
-{
-    TALLOC_CTX *tmp_ctx;
-    struct dp_mod_ctx *module;
-    char **doms;
-    char *sec;
-    char *mod_name;
-    char *path;
-    void *handle;
-    char *mod_init_fn_name;
-    sssm_init_fn_t mod_init_fn;
-    int num_mods;
-    int i, ret;
-
-    tmp_ctx = talloc_new(dpctx);
-    if (!tmp_ctx) {
-        return ENOMEM;
-    }
-
-    ret = confdb_get_domains(dpctx->cdb, tmp_ctx, &doms);
-    if (ret != EOK) {
-        DEBUG(2, ("No domains configured!\n"));
-        return ret;
-    }
-
-    num_mods = 0;
-    for (i = 0; doms[i]; i++) {
-        sec = talloc_asprintf(tmp_ctx, "config/domains/%s", doms[i]);
-        if (!sec) {
-            ret = ENOMEM;
-            goto done;
-        }
-        ret = confdb_get_string(dpctx->cdb, tmp_ctx, sec,
-                                "provider", NULL, &mod_name);
-        if (ret != EOK) {
-            goto done;
-        }
-
-        /* the LOCAL domain does not have a backend at the moment */
-        if (strcasecmp(mod_name, "LOCAL") == 0) {
-            continue;
-        }
-
-        path = talloc_asprintf(tmp_ctx, "%s/libsss_%s.so",
-                               DATA_PROVIDER_PLUGINS_PATH, mod_name);
-
-        handle = dlopen(path, RTLD_NOW);
-        if (!handle) {
-            DEBUG(0, ("Unable to load %s module with path (%s), error: %s\n",
-                      mod_name, path, dlerror()));
-            ret = ELIBACC;
-            goto done;
-        }
-
-        mod_init_fn_name = talloc_asprintf(tmp_ctx, "sssm_%s_init", mod_name);
-        if (!mod_init_fn_name) {
-            ret = ENOMEM;
-            goto done;
-        }
-
-        mod_init_fn = (sssm_init_fn_t)dlsym(handle, mod_init_fn_name);
-        if (!mod_init_fn) {
-            DEBUG(0, ("Unable to load init fn from module %s, error: %s\n",
-                      mod_name, dlerror()));
-            ret = ELIBBAD;
-            goto done;
-        }
-
-        dpctx->modules = talloc_array(tmp_ctx, struct dp_mod_ctx *, num_mods +1);
-        if (!dpctx->modules) {
-            ret = ENOMEM;
-            goto done;
-        }
-        module = talloc(dpctx->modules, struct dp_mod_ctx);
-        if (!module) {
-            ret = ENOMEM;
-            goto done;
-        }
-        dpctx->modules[num_mods] = module;
-
-        module->dp_ctx = dpctx;
-        module->domain = talloc_strdup(dpctx->modules, doms[i]);
-        module->name = talloc_steal(dpctx->modules, mod_name);
-
-        ret = mod_init_fn(module);
-        if (ret != EOK) {
-            DEBUG(0, ("Error (%d) in module (%s) initialization!\n",
-                      ret, mod_name));
-            continue;
-        }
-
-        num_mods++;
-    }
-
-    ret = EOK;
-
-done:
-    talloc_free(doms);
-    return ret;
-}
-
 int dp_process_init(TALLOC_CTX *mem_ctx,
                     struct event_context *ev,
                     struct confdb_ctx *cdb)
@@ -390,12 +490,6 @@ int dp_process_init(TALLOC_CTX *mem_ctx,
         return ret;
     }
 
-    ret = init_data_providers(dpctx);
-    if (ret != EOK) {
-        DEBUG(0, ("fatal error initializing data providers\n"));
-        return ret;
-    }
-
     return EOK;
 }
 
diff --git a/server/providers/data_provider.h b/server/providers/data_provider.h
index 68c6db9..cd8098b 100644
--- a/server/providers/data_provider.h
+++ b/server/providers/data_provider.h
@@ -29,41 +29,24 @@
 #include "ldb.h"
 
 #define DATA_PROVIDER_VERSION 0x0001
+#define BE_VERSION 0x0001
 #define DATA_PROVIDER_SERVICE_NAME "dp"
 #define DATA_PROVIDER_PIPE "private/sbus-dp"
 
 #define DATA_PROVIDER_DB_FILE "sssd.ldb"
 #define DATA_PROVIDER_DB_CONF_SEC "config/services/nss"
 
-struct dp_mod_ops {
-    int (*check_online)(void *pvt_data, int *reply);
-};
-
 #define MOD_OFFLINE 0x0000
 #define MOD_ONLINE  0x0001
 
-struct dp_mod_ctx;
-typedef int (*sssm_init_fn_t)(struct dp_mod_ctx *);
-
-struct dp_mod_ctx {
-    struct dp_ctx *dp_ctx;
-    const char *name;
-    const char *domain;
-    struct dp_mod_ops *ops;
-    void *pvt_data;
-};
+#define DP_CLI_INTERFACE "org.freeipa.sssd.dataprovider"
+#define DP_CLI_PATH "/org/freeipa/sssd/dataprovider"
 
-struct dp_ctx {
-    struct event_context *ev;
-    struct confdb_ctx *cdb;
-    struct ldb_context *ldb;
-    struct service_sbus_ctx *ss_ctx;
-    struct dp_mod_ctx **modules;
-};
+#define DP_CLI_BACKEND 0x0001
+#define DP_CLI_FRONTEND 0x0002
+#define DP_CLI_TYPE_MASK 0x0003
 
-struct dp_client {
-    struct dp_ctx *dpctx;
-    DBusConnection *conn;
-};
+#define DP_CLI_METHOD_IDENTITY "getIdentity"
+#define DP_CLI_METHOD_ONLINE "getOnline"
 
 #endif /* __DATA_PROVIDER_ */
diff --git a/server/providers/data_provider_be.c b/server/providers/data_provider_be.c
new file mode 100644
index 0000000..83659be
--- /dev/null
+++ b/server/providers/data_provider_be.c
@@ -0,0 +1,515 @@
+/*
+   SSSD
+
+   Data Provider Runner
+
+   Copyright (C) Simo Sorce <ssorce@redhat.com>	2008
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <string.h>
+#include <sys/time.h>
+#include <errno.h>
+#include "popt.h"
+#include "ldb.h"
+#include "ldb_errors.h"
+#include "util/util.h"
+#include "confdb/confdb.h"
+#include "dbus/dbus.h"
+#include "sbus/sssd_dbus.h"
+#include "sbus_interfaces.h"
+#include "util/btreemap.h"
+#include "data_provider.h"
+#include "util/service_helpers.h"
+
+struct dp_mod_ops {
+    int (*check_online)(void *pvt_data, int *reply);
+};
+
+struct be_ctx {
+    struct event_context *ev;
+    struct confdb_ctx *cdb;
+    struct ldb_context *ldb;
+    struct service_sbus_ctx *ss_ctx;
+    struct service_sbus_ctx *dp_ctx;
+    const char *name;
+    const char *domain;
+    const char *identity;
+    struct dp_mod_ops *ops;
+    void *pvt_data;
+};
+
+typedef int (*be_init_fn_t)(struct be_ctx *, struct dp_mod_ops **, void **);
+
+static int service_identity(DBusMessage *message, void *data, DBusMessage **r);
+static int service_pong(DBusMessage *message, void *data, DBusMessage **r);
+
+struct sbus_method mon_sbus_methods[] = {
+    {SERVICE_METHOD_IDENTITY, service_identity},
+    {SERVICE_METHOD_PING, service_pong},
+    {NULL, NULL}
+};
+
+static int be_identity(DBusMessage *message, void *data, DBusMessage **r);
+static int check_online(DBusMessage *message, void *data, DBusMessage **r);
+
+struct sbus_method be_methods[] = {
+    { DP_CLI_METHOD_IDENTITY, be_identity },
+    { DP_CLI_METHOD_ONLINE, check_online },
+    { NULL, NULL }
+};
+
+static int service_identity(DBusMessage *message, void *data, DBusMessage **r)
+{
+    dbus_uint16_t version = BE_VERSION;
+    struct sbus_message_handler_ctx *smh_ctx;
+    struct be_ctx *ctx;
+    DBusMessage *reply;
+    dbus_bool_t ret;
+    void *user_data;
+
+    if (!data) return EINVAL;
+    smh_ctx = talloc_get_type(data, struct sbus_message_handler_ctx);
+    if (!smh_ctx) return EINVAL;
+    user_data = sbus_conn_get_private_data(smh_ctx->conn_ctx);
+    if (!user_data) return EINVAL;
+    ctx = talloc_get_type(user_data, struct be_ctx);
+    if (!ctx) return EINVAL;
+
+    reply = dbus_message_new_method_return(message);
+    ret = dbus_message_append_args(reply,
+                                   DBUS_TYPE_STRING, &ctx->identity,
+                                   DBUS_TYPE_UINT16, &version,
+                                   DBUS_TYPE_INVALID);
+    if (!ret) {
+        return EIO;
+    }
+
+    *r = reply;
+    return EOK;
+}
+
+static int service_pong(DBusMessage *message, void *data, DBusMessage **r)
+{
+    DBusMessage *reply;
+    dbus_bool_t ret;
+
+    reply = dbus_message_new_method_return(message);
+    ret = dbus_message_append_args(reply, DBUS_TYPE_INVALID);
+    if (!ret) {
+        return EIO;
+    }
+
+    *r = reply;
+    return EOK;
+}
+
+static int be_identity(DBusMessage *message, void *data, DBusMessage **r)
+{
+    dbus_uint16_t version = BE_VERSION;
+    dbus_uint16_t clitype = DP_CLI_BACKEND;
+    struct sbus_message_handler_ctx *smh_ctx;
+    struct be_ctx *ctx;
+    DBusMessage *reply;
+    dbus_bool_t ret;
+    void *user_data;
+
+    if (!data) return EINVAL;
+    smh_ctx = talloc_get_type(data, struct sbus_message_handler_ctx);
+    if (!smh_ctx) return EINVAL;
+    user_data = sbus_conn_get_private_data(smh_ctx->conn_ctx);
+    if (!user_data) return EINVAL;
+    ctx = talloc_get_type(user_data, struct be_ctx);
+    if (!ctx) return EINVAL;
+
+    reply = dbus_message_new_method_return(message);
+    ret = dbus_message_append_args(reply,
+                                   DBUS_TYPE_UINT16, &clitype,
+                                   DBUS_TYPE_UINT16, &version,
+                                   DBUS_TYPE_STRING, &ctx->name,
+                                   DBUS_TYPE_STRING, &ctx->domain,
+                                   DBUS_TYPE_INVALID);
+    if (!ret) {
+        return EIO;
+    }
+
+    *r = reply;
+    return EOK;
+}
+
+static int check_online(DBusMessage *message, void *data, DBusMessage **r)
+{
+    struct sbus_message_handler_ctx *smh_ctx;
+    struct be_ctx *ctx;
+    DBusMessage *reply;
+    dbus_bool_t dbret;
+    void *user_data;
+    int online = 0;
+    int ret;
+
+    if (!data) return EINVAL;
+    smh_ctx = talloc_get_type(data, struct sbus_message_handler_ctx);
+    if (!smh_ctx) return EINVAL;
+    user_data = sbus_conn_get_private_data(smh_ctx->conn_ctx);
+    if (!user_data) return EINVAL;
+    ctx = talloc_get_type(user_data, struct be_ctx);
+    if (!ctx) return EINVAL;
+
+    ret = ctx->ops->check_online(ctx->pvt_data, &online);
+    if (ret != EOK) return ret;
+
+    reply = dbus_message_new_method_return(message);
+    dbret = dbus_message_append_args(reply,
+                                     DBUS_TYPE_UINT16, &online,
+                                     DBUS_TYPE_INVALID);
+    if (!dbret) return EIO;
+
+    *r = reply;
+    return EOK;
+}
+
+/* mon_cli_init
+ * sbus channel to the monitor daemon */
+static int mon_cli_init(struct be_ctx *ctx)
+{
+    struct service_sbus_ctx *ss_ctx;
+
+   /* Set up SBUS connection to the monitor */
+    ss_ctx = sssd_service_sbus_init(ctx, ctx->ev, ctx->cdb,
+                                    mon_sbus_methods);
+    if (ss_ctx == NULL) {
+        DEBUG(0, ("Could not initialize D-BUS.\n"));
+        return ENOMEM;
+    }
+
+    ctx->ss_ctx = ss_ctx;
+
+    /* attach be context to the connection */
+    sbus_conn_set_private_data(ss_ctx->scon_ctx, ctx);
+
+    return EOK;
+}
+
+static int be_dp_sbus_init(TALLOC_CTX *mem_ctx,
+                           struct event_context *ev,
+                           struct confdb_ctx *cdb,
+                           const char *address,
+                           struct sbus_method *methods,
+                           struct service_sbus_ctx **srvs_ctx)
+{
+    struct service_sbus_ctx *ss_ctx;
+    struct sbus_method_ctx *sm_ctx;
+    TALLOC_CTX *tmp_ctx;
+    char *default_monitor_address;
+    char *sbus_address;
+    DBusConnection *conn;
+    int ret;
+
+    tmp_ctx = talloc_new(mem_ctx);
+    if (tmp_ctx == NULL) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    ss_ctx = talloc_zero(tmp_ctx, struct service_sbus_ctx);
+    if (ss_ctx == NULL) {
+        ret = ENOMEM;
+        goto done;
+    }
+    ss_ctx->ev = ev;
+
+    default_monitor_address = talloc_asprintf(tmp_ctx, "unix:path=%s/%s",
+                                              PIPE_PATH, SSSD_SERVICE_PIPE);
+    if (default_monitor_address == NULL) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    ret = confdb_get_string(cdb, tmp_ctx,
+                            "config/services/monitor", "sbusAddress",
+                            default_monitor_address, &sbus_address);
+    if (ret != EOK) goto done;
+
+    ret = sbus_new_connection(ss_ctx, ss_ctx->ev,
+                              sbus_address, &ss_ctx->scon_ctx,
+                              NULL);
+    if (ret != EOK) goto done;
+
+    conn = sbus_get_connection(ss_ctx->scon_ctx);
+
+    /* set up handler for service methods */
+    sm_ctx = talloc_zero(ss_ctx, struct sbus_method_ctx);
+    if (sm_ctx == NULL) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    sm_ctx->interface = talloc_strdup(sm_ctx, SERVICE_INTERFACE);
+    sm_ctx->path = talloc_strdup(sm_ctx, SERVICE_PATH);
+    if (!sm_ctx->interface || !sm_ctx->path) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    /* Set up required monitor methods */
+    sm_ctx->methods = methods;
+
+    sm_ctx->message_handler = sbus_message_handler;
+    sbus_conn_add_method_ctx(ss_ctx->scon_ctx, sm_ctx);
+
+    talloc_steal(mem_ctx, ss_ctx);
+    *srvs_ctx = ss_ctx;
+    ret = EOK;
+
+done:
+    talloc_free(tmp_ctx);
+    return ret;
+}
+
+/* be_cli_init
+ * sbus channel to the data provider daemon */
+static int be_cli_init(struct be_ctx *ctx)
+{
+    struct service_sbus_ctx *dp_ctx;
+    char *default_dp_address;
+    int ret;
+
+    default_dp_address = talloc_asprintf(ctx, "unix:path=%s/%s",
+                                         PIPE_PATH, DATA_PROVIDER_PIPE);
+    if (!default_dp_address) return ENOMEM;
+
+    ret = be_dp_sbus_init(ctx, ctx->ev, ctx->cdb,
+                          default_dp_address, be_methods,
+                          &dp_ctx);
+    if (ret != EOK) {
+        talloc_free(default_dp_address);
+        return ret;
+    }
+
+    ctx->dp_ctx = dp_ctx;
+
+    /* attach be context to the connection */
+    sbus_conn_set_private_data(dp_ctx->scon_ctx, ctx);
+
+    talloc_free(default_dp_address);
+    return EOK;
+}
+
+static int be_db_init(struct be_ctx *ctx)
+{
+    TALLOC_CTX *tmp_ctx;
+    char *ldb_file;
+    char *default_db_file;
+    int ret;
+
+    tmp_ctx = talloc_new(ctx);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    default_db_file = talloc_asprintf(tmp_ctx, "%s/%s", DB_PATH, DATA_PROVIDER_DB_FILE);
+    if (!default_db_file) {
+        talloc_free(tmp_ctx);
+        return ENOMEM;
+    }
+
+    ret = confdb_get_string(ctx->cdb, tmp_ctx,
+                            DATA_PROVIDER_DB_CONF_SEC, "ldbFile",
+                            default_db_file, &ldb_file);
+    if (ret != EOK) {
+        talloc_free(tmp_ctx);
+        return ret;
+    }
+
+    ctx->ldb = ldb_init(tmp_ctx, ctx->ev);
+    if (!ctx->ldb) {
+        talloc_free(tmp_ctx);
+        return EIO;
+    }
+
+    ret = ldb_connect(ctx->ldb, ldb_file, 0, NULL);
+    if (ret != LDB_SUCCESS) {
+        talloc_free(tmp_ctx);
+        return EIO;
+    }
+
+    talloc_steal(ctx, ctx->ldb);
+
+    talloc_free(tmp_ctx);
+    return EOK;
+}
+
+static int load_backend(struct be_ctx *ctx)
+{
+    TALLOC_CTX *tmp_ctx;
+    char *path;
+    void *handle;
+    char *mod_init_fn_name;
+    be_init_fn_t mod_init_fn;
+    int ret;
+
+    tmp_ctx = talloc_new(ctx);
+    if (!tmp_ctx) {
+        return ENOMEM;
+    }
+
+    path = talloc_asprintf(tmp_ctx, "%s/libsss_%s.so",
+                           DATA_PROVIDER_PLUGINS_PATH, ctx->name);
+
+    handle = dlopen(path, RTLD_NOW);
+    if (!handle) {
+        DEBUG(0, ("Unable to load %s module with path (%s), error: %s\n",
+                  ctx->name, path, dlerror()));
+        ret = ELIBACC;
+        goto done;
+    }
+
+    mod_init_fn_name = talloc_asprintf(tmp_ctx, "sssm_%s_init", ctx->name);
+    if (!mod_init_fn_name) {
+        ret = ENOMEM;
+        goto done;
+    }
+
+    mod_init_fn = (be_init_fn_t)dlsym(handle, mod_init_fn_name);
+    if (!mod_init_fn) {
+        DEBUG(0, ("Unable to load init fn from module %s, error: %s\n",
+                  ctx->name, dlerror()));
+        ret = ELIBBAD;
+        goto done;
+    }
+
+    ret = mod_init_fn(ctx, &ctx->ops, &ctx->pvt_data);
+    if (ret != EOK) {
+        DEBUG(0, ("Error (%d) in module (%s) initialization!\n",
+                  ret, ctx->name));
+        goto done;
+    }
+
+    ret = EOK;
+
+done:
+    talloc_free(tmp_ctx);
+    return ret;
+}
+
+int be_process_init(TALLOC_CTX *mem_ctx,
+                    const char *be_name,
+                    const char *be_domain,
+                    struct event_context *ev,
+                    struct confdb_ctx *cdb)
+{
+    struct be_ctx *ctx;
+    int ret;
+
+    ctx = talloc_zero(mem_ctx, struct be_ctx);
+    if (!ctx) {
+        DEBUG(0, ("fatal error initializing be_ctx\n"));
+        return ENOMEM;
+    }
+    ctx->ev = ev;
+    ctx->cdb = cdb;
+    ctx->domain = talloc_strdup(ctx, be_domain);
+    ctx->identity = talloc_asprintf(ctx, "%%BE_%s", be_domain);
+    if (!ctx->domain || !ctx->identity) {
+        DEBUG(0, ("Out of memory!?\n"));
+        return ENOMEM;
+    }
+
+    ret = be_db_init(ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error opening database\n"));
+        return ret;
+    }
+
+    ret = mon_cli_init(ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error setting up monitor bus\n"));
+        return ret;
+    }
+
+    ret = be_cli_init(ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error setting up server bus\n"));
+        return ret;
+    }
+
+    ret = load_backend(ctx);
+    if (ret != EOK) {
+        DEBUG(0, ("fatal error initializing data providers\n"));
+        return ret;
+    }
+
+    return EOK;
+}
+
+int main(int argc, const char *argv[])
+{
+    int opt;
+    poptContext pc;
+    char *be_name;
+    char *be_domain;
+    char *srv_name;
+    struct main_context *main_ctx;
+    int ret;
+
+	struct poptOption long_options[] = {
+		POPT_AUTOHELP
+        SSSD_MAIN_OPTS
+        {"provider", 0, POPT_ARG_STRING, &be_name, 0,
+         "Information Provider", NULL },
+        {"domain", 0, POPT_ARG_STRING, &be_domain, 0,
+         "Domain of the information provider", NULL },
+		{ NULL }
+	};
+
+	pc = poptGetContext(argv[0], argc, argv, long_options, 0);
+	while((opt = poptGetNextOpt(pc)) != -1) {
+		switch(opt) {
+		default:
+			fprintf(stderr, "\nInvalid option %s: %s\n\n",
+				  poptBadOption(pc, 0), poptStrerror(opt));
+			poptPrintUsage(pc, stderr, 0);
+			return 1;
+		}
+	}
+
+	poptFreeContext(pc);
+
+    /* set up things like debug , signals, daemonization, etc... */
+    srv_name = talloc_asprintf(NULL, "sssd[be[%s]]", be_name);
+    if (!srv_name) return 2;
+
+    ret = server_setup(srv_name, 0, &main_ctx);
+    if (ret != EOK) return 2;
+
+    ret = be_process_init(main_ctx,
+                          be_name, be_domain,
+                          main_ctx->event_ctx,
+                          main_ctx->confdb_ctx);
+    if (ret != EOK) return 3;
+
+    /* loop on main */
+    server_loop(main_ctx);
+
+    return 0;
+}
+
diff --git a/server/server.mk b/server/server.mk
index 480e58f..7f9274d 100644
--- a/server/server.mk
+++ b/server/server.mk
@@ -16,6 +16,9 @@ SERVER_OBJ = \
 DP_OBJ = \
 	providers/data_provider.o
 
+DP_BE_OBJ = \
+	providers/data_provider_be.o
+
 NSSSRV_OBJ = \
     nss/nsssrv.o \
     nss/nsssrv_packet.o \
@@ -34,3 +37,6 @@ sbin/sssd_nss: $(NSSSRV_OBJ) $(UTIL_OBJ)
 
 sbin/sssd_dp: $(DP_OBJ) $(UTIL_OBJ)
 	$(CC) -o sbin/sssd_dp $(DP_OBJ) $(UTIL_OBJ) $(LDFLAGS) $(LIBS)
+
+sbin/sssd_be: $(DP_BE_OBJ) $(UTIL_OBJ)
+	$(CC) -o sbin/sssd_be $(DP_BE_OBJ) $(UTIL_OBJ) $(LDFLAGS) $(LIBS)
diff --git a/server/util/server.c b/server/util/server.c
index def44f0..6983fca 100644
--- a/server/util/server.c
+++ b/server/util/server.c
@@ -242,7 +242,10 @@ int server_setup(const char *name, int flags,
 	uint16_t stdin_event_flags;
 	int ret = EOK;
 
-    debug_prg_name = name;
+    debug_prg_name = strdup(name);
+    if (!debug_prg_name) {
+        return ENOMEM;
+    }
 
 	setup_signals();
 
diff --git a/server/util/service_helpers.c b/server/util/service_helpers.c
index 6232108..1630946 100644
--- a/server/util/service_helpers.c
+++ b/server/util/service_helpers.c
@@ -33,8 +33,7 @@
 struct service_sbus_ctx *sssd_service_sbus_init(TALLOC_CTX *mem_ctx,
                                                 struct event_context *ev,
                                                 struct confdb_ctx *cdb,
-                                                sbus_msg_handler_fn get_identity,
-                                                sbus_msg_handler_fn ping)
+                                                struct sbus_method *methods)
 {
     struct service_sbus_ctx *ss_ctx;
     struct sbus_method_ctx *sm_ctx;
@@ -75,22 +74,8 @@ struct service_sbus_ctx *sssd_service_sbus_init(TALLOC_CTX *mem_ctx,
     sm_ctx->path = talloc_strdup(sm_ctx, SERVICE_PATH);
     if (!sm_ctx->interface || !sm_ctx->path) goto error;
 
-    /* Set up required monitor methods */
-    sm_ctx->methods = talloc_array(sm_ctx, struct sbus_method, 3);
-    if (sm_ctx->methods == NULL) goto error;
-
-    /* Handle getIdentity */
-    sm_ctx->methods[0].method = SERVICE_METHOD_IDENTITY;
-    sm_ctx->methods[0].fn = get_identity;
-
-    /* Handle ping */
-    sm_ctx->methods[1].method = SERVICE_METHOD_PING;
-    sm_ctx->methods[1].fn = ping;
-
-    /* Terminate the list */
-    sm_ctx->methods[2].method = NULL;
-    sm_ctx->methods[2].fn = NULL;
-
+    /* Set up required monitor methods  and handlers */
+    sm_ctx->methods = methods;
     sm_ctx->message_handler = sbus_message_handler;
     sbus_conn_add_method_ctx(ss_ctx->scon_ctx, sm_ctx);
 
diff --git a/server/util/service_helpers.h b/server/util/service_helpers.h
index 440186d..f2701d5 100644
--- a/server/util/service_helpers.h
+++ b/server/util/service_helpers.h
@@ -33,7 +33,6 @@ struct service_sbus_ctx {
 struct service_sbus_ctx *sssd_service_sbus_init(TALLOC_CTX *mem_ctx,
                                                 struct event_context *ev,
                                                 struct confdb_ctx *cdb,
-                                                sbus_msg_handler_fn get_identity,
-                                                sbus_msg_handler_fn ping);
+                                                struct sbus_method *methods);
 
 #endif /*SERVICE_HELPERS_H_*/