Force user check and discover user's domain

Force a user lookup against the users domain provider.
If a user domain is not specified search though all non fully qualifying
domains.
Perform authentication against the corrent domain auth backend, based on the
user's domain found in the lookup if one was not
specified.
Also move the NSS-DP functions in COMMON-DP as they are reused by the PAM
responder too now.

2 files changed, 274 insertions, 0 deletions

diff --git a/server/responder/common/responder.h b/server/responder/common/responder.h
index 6f737a14..f5d5246f 100644
--- a/server/responder/common/responder.h
+++ b/server/responder/common/responder.h
@@ -115,4 +115,16 @@ int sss_cmd_get_version(struct cli_ctx *cctx);
 /* responder_dp.c */
 int sss_dp_init(struct resp_ctx *rctx, struct sbus_method dp_methods[]);
 
+#define NSS_DP_USER 1
+#define NSS_DP_GROUP 2
+#define NSS_DP_INITGROUPS 3
+
+typedef void (*nss_dp_callback_t)(uint16_t err_maj, uint32_t err_min,
+                                  const char *err_msg, void *ptr);
+
+int nss_dp_send_acct_req(struct resp_ctx *rctx, TALLOC_CTX *memctx,
+                         nss_dp_callback_t callback, void *callback_ctx,
+                         int timeout, const char *domain, int type,
+                         const char *opt_name, uint32_t opt_id);
+
 #endif /* __SSS_RESPONDER_H__ */
diff --git a/server/responder/common/responder_dp.c b/server/responder/common/responder_dp.c
index 7fc7e0b3..83f89a54 100644
--- a/server/responder/common/responder_dp.c
+++ b/server/responder/common/responder_dp.c
@@ -120,3 +120,265 @@ int sss_dp_init(struct resp_ctx *rctx, struct sbus_method *dp_methods)
     return EOK;
 }
 
+
+struct nss_dp_req {
+    nss_dp_callback_t callback;
+    void *callback_ctx;
+    struct tevent_timer *te;
+    DBusPendingCall *pending_reply;
+};
+
+static int nss_dp_req_destructor(void *ptr)
+{
+    struct nss_dp_req *req = talloc_get_type(ptr, struct nss_dp_req);
+
+    if (req->pending_reply) {
+        dbus_pending_call_cancel(req->pending_reply);
+    }
+
+    return 0;
+}
+
+static void nss_dp_send_acct_timeout(struct tevent_context *ev,
+                                     struct tevent_timer *te,
+                                     struct timeval t, void *data)
+{
+    struct nss_dp_req *ndp_req;
+    dbus_uint16_t err_maj = DP_ERR_TIMEOUT;
+    dbus_uint32_t err_min = EIO;
+    const char *err_msg = "Request timed out";
+
+    ndp_req = talloc_get_type(data, struct nss_dp_req);
+
+    ndp_req->callback(err_maj, err_min, err_msg, ndp_req->callback_ctx);
+
+    talloc_free(ndp_req);
+}
+
+static int nss_dp_get_reply(DBusPendingCall *pending,
+                            dbus_uint16_t *err_maj,
+                            dbus_uint32_t *err_min,
+                            const char **err_msg);
+
+static void nss_dp_send_acct_callback(DBusPendingCall *pending, void *ptr)
+{
+    struct nss_dp_req *ndp_req;
+    dbus_uint16_t err_maj;
+    dbus_uint32_t err_min;
+    const char *err_msg;
+    int ret;
+
+    ndp_req = talloc_get_type(ptr, struct nss_dp_req);
+
+    /* free timeout event and remove request destructor */
+    talloc_free(ndp_req->te);
+    talloc_set_destructor(ndp_req, NULL);
+
+    ret = nss_dp_get_reply(pending, &err_maj, &err_min, &err_msg);
+    if (ret != EOK) {
+        err_maj = DP_ERR_FATAL;
+        err_min = ret;
+        err_msg = "Failed to get reply from Data Provider";
+    }
+
+    ndp_req->callback(err_maj, err_min, err_msg, ndp_req->callback_ctx);
+
+    talloc_free(ndp_req);
+}
+
+int nss_dp_send_acct_req(struct resp_ctx *rctx, TALLOC_CTX *memctx,
+                         nss_dp_callback_t callback, void *callback_ctx,
+                         int timeout, const char *domain, int type,
+                         const char *opt_name, uint32_t opt_id)
+{
+    struct nss_dp_req *ndp_req;
+    DBusMessage *msg;
+    DBusPendingCall *pending_reply;
+    DBusConnection *conn;
+    dbus_bool_t ret;
+    uint32_t be_type;
+    const char *attrs = "core";
+    char *filter;
+    struct timeval tv;
+
+    /* either, or, not both */
+    if (opt_name && opt_id) {
+        return EINVAL;
+    }
+
+    if (!domain) {
+        return EINVAL;
+    }
+
+    switch (type) {
+    case NSS_DP_USER:
+        be_type = BE_REQ_USER;
+        break;
+    case NSS_DP_GROUP:
+        be_type = BE_REQ_GROUP;
+        break;
+    case NSS_DP_INITGROUPS:
+        be_type = BE_REQ_INITGROUPS;
+        break;
+    default:
+        return EINVAL;
+    }
+
+    if (opt_name) {
+        filter = talloc_asprintf(memctx, "name=%s", opt_name);
+    } else if (opt_id) {
+        filter = talloc_asprintf(memctx, "idnumber=%u", opt_id);
+    } else {
+        filter = talloc_strdup(memctx, "name=*");
+    }
+    if (!filter) {
+        return ENOMEM;
+    }
+
+    /* double check dp_ctx has actually been initialized.
+     * in some pathological cases it may happen that nss starts up before
+     * dp connection code is actually able to establish a connection.
+     */
+    if (!rctx->dp_ctx) {
+        DEBUG(1, ("The Data Provider connection is not available yet!"
+                  " This maybe a bug, it shouldn't happen!\n"));
+        return EIO;
+    }
+    conn = sbus_get_connection(rctx->dp_ctx->scon_ctx);
+
+    /* create the message */
+    msg = dbus_message_new_method_call(NULL,
+                                       DP_CLI_PATH,
+                                       DP_CLI_INTERFACE,
+                                       DP_SRV_METHOD_GETACCTINFO);
+    if (msg == NULL) {
+        DEBUG(0,("Out of memory?!\n"));
+        return ENOMEM;
+    }
+
+    DEBUG(4, ("Sending request for [%s][%u][%s][%s]\n",
+              domain, be_type, attrs, filter));
+
+    ret = dbus_message_append_args(msg,
+                                   DBUS_TYPE_STRING, &domain,
+                                   DBUS_TYPE_UINT32, &be_type,
+                                   DBUS_TYPE_STRING, &attrs,
+                                   DBUS_TYPE_STRING, &filter,
+                                   DBUS_TYPE_INVALID);
+    if (!ret) {
+        DEBUG(1,("Failed to build message\n"));
+        return EIO;
+    }
+
+    ret = dbus_connection_send_with_reply(conn, msg, &pending_reply,
+                                            600000 /* TODO: set timeout */);
+    if (!ret) {
+        /*
+         * Critical Failure
+         * We can't communicate on this connection
+         * We'll drop it using the default destructor.
+         */
+        DEBUG(0, ("D-BUS send failed.\n"));
+        dbus_message_unref(msg);
+        return EIO;
+    }
+
+    ndp_req = talloc_zero(memctx, struct nss_dp_req);
+    if (!ndp_req) {
+        dbus_message_unref(msg);
+        return ENOMEM;
+    }
+    ndp_req->callback = callback;
+    ndp_req->callback_ctx = callback_ctx;
+
+    /* set up destructor */
+    ndp_req->pending_reply = pending_reply;
+    talloc_set_destructor((TALLOC_CTX *)ndp_req, nss_dp_req_destructor);
+
+    /* setup the timeout handler */
+    gettimeofday(&tv, NULL);
+    tv.tv_sec += timeout/1000;
+    tv.tv_usec += (timeout%1000) * 1000;
+    ndp_req->te = tevent_add_timer(rctx->ev, memctx, tv,
+                                   nss_dp_send_acct_timeout, ndp_req);
+
+    /* Set up the reply handler */
+    dbus_pending_call_set_notify(pending_reply,
+                                 nss_dp_send_acct_callback,
+                                 ndp_req, NULL);
+    dbus_message_unref(msg);
+
+    return EOK;
+}
+
+static int nss_dp_get_reply(DBusPendingCall *pending,
+                            dbus_uint16_t *err_maj,
+                            dbus_uint32_t *err_min,
+                            const char **err_msg)
+{
+    DBusMessage *reply;
+    DBusError dbus_error;
+    dbus_bool_t ret;
+    int type;
+    int err = EOK;
+
+    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, ("Severe error. A reply callback was called but no reply was received and no timeout occurred\n"));
+
+        /* FIXME: Destroy this connection ? */
+        err = EIO;
+        goto done;
+    }
+
+    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, err_maj,
+                                    DBUS_TYPE_UINT32, err_min,
+                                    DBUS_TYPE_STRING, err_msg,
+                                    DBUS_TYPE_INVALID);
+        if (!ret) {
+            DEBUG(1,("Filed to parse message\n"));
+            /* FIXME: Destroy this connection ? */
+            if (dbus_error_is_set(&dbus_error)) dbus_error_free(&dbus_error);
+            err = EIO;
+            goto done;
+        }
+
+        DEBUG(4, ("Got reply (%u, %u, %s) from Data Provider\n",
+                  (unsigned int)*err_maj, (unsigned int)*err_min, *err_msg));
+
+        break;
+
+    case DBUS_MESSAGE_TYPE_ERROR:
+        DEBUG(0,("The Data Provider returned an error [%s]\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.
+         */
+
+        /* FIXME: Destroy this connection ? */
+        err = EIO;
+    }
+
+done:
+    dbus_pending_call_unref(pending);
+    dbus_message_unref(reply);
+
+    return err;
+}
+