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-rw-r--r--server/responder/nss/nsssrv.c590
1 files changed, 590 insertions, 0 deletions
diff --git a/server/responder/nss/nsssrv.c b/server/responder/nss/nsssrv.c
new file mode 100644
index 000000000..93490c46d
--- /dev/null
+++ b/server/responder/nss/nsssrv.c
@@ -0,0 +1,590 @@
+/*
+ SSSD
+
+ NSS Responder
+
+ 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 "util/util.h"
+#include "responder/nss/nsssrv.h"
+#include "db/sysdb.h"
+#include "confdb/confdb.h"
+#include "dbus/dbus.h"
+#include "sbus/sssd_dbus.h"
+#include "util/btreemap.h"
+#include "responder/common/responder_packet.h"
+#include "providers/data_provider.h"
+#include "monitor/monitor_sbus.h"
+#include "monitor/monitor_interfaces.h"
+#include "sbus/sbus_client.h"
+
+#define SSS_NSS_PIPE_NAME "nss"
+
+static int service_identity(DBusMessage *message, struct sbus_conn_ctx *sconn);
+static int service_pong(DBusMessage *message, struct sbus_conn_ctx *sconn);
+static int service_reload(DBusMessage *message, struct sbus_conn_ctx *sconn);
+static int nss_init_domains(struct nss_ctx *nctx);
+static int _domain_comparator(const void *key1, const void *key2);
+
+struct sbus_method nss_sbus_methods[] = {
+ {SERVICE_METHOD_IDENTITY, service_identity},
+ {SERVICE_METHOD_PING, service_pong},
+ {SERVICE_METHOD_RELOAD, service_reload},
+ {NULL, NULL}
+};
+
+static void set_nonblocking(int fd)
+{
+ unsigned v;
+ v = fcntl(fd, F_GETFL, 0);
+ fcntl(fd, F_SETFL, v | O_NONBLOCK);
+}
+
+static void set_close_on_exec(int fd)
+{
+ unsigned v;
+ v = fcntl(fd, F_GETFD, 0);
+ fcntl(fd, F_SETFD, v | FD_CLOEXEC);
+}
+
+static int client_destructor(struct cli_ctx *ctx)
+{
+ if (ctx->cfd > 0) close(ctx->cfd);
+ return 0;
+}
+
+static void client_send(struct event_context *ev, struct cli_ctx *cctx)
+{
+ int ret;
+
+ ret = sss_packet_send(cctx->creq->out, cctx->cfd);
+ if (ret == EAGAIN) {
+ /* not all data was sent, loop again */
+ return;
+ }
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to read request, aborting client!\n"));
+ talloc_free(cctx);
+ return;
+ }
+
+ /* ok all sent */
+ EVENT_FD_NOT_WRITEABLE(cctx->cfde);
+ EVENT_FD_READABLE(cctx->cfde);
+ talloc_free(cctx->creq);
+ cctx->creq = NULL;
+ return;
+}
+
+static void client_recv(struct event_context *ev, struct cli_ctx *cctx)
+{
+ int ret;
+
+ if (!cctx->creq) {
+ cctx->creq = talloc_zero(cctx, struct cli_request);
+ if (!cctx->creq) {
+ DEBUG(0, ("Failed to alloc request, aborting client!\n"));
+ talloc_free(cctx);
+ return;
+ }
+ }
+
+ if (!cctx->creq->in) {
+ ret = sss_packet_new(cctx->creq, NSS_PACKET_MAX_RECV_SIZE,
+ 0, &cctx->creq->in);
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to alloc request, aborting client!\n"));
+ talloc_free(cctx);
+ return;
+ }
+ }
+
+ ret = sss_packet_recv(cctx->creq->in, cctx->cfd);
+ switch (ret) {
+ case EOK:
+ /* do not read anymore */
+ EVENT_FD_NOT_READABLE(cctx->cfde);
+ /* execute command */
+ ret = nss_cmd_execute(cctx);
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to execute request, aborting client!\n"));
+ talloc_free(cctx);
+ }
+ /* past this point cctx can be freed at any time by callbacks
+ * in case of error, do not use it */
+ return;
+
+ case EAGAIN:
+ /* need to read still some data, loop again */
+ break;
+
+ case EINVAL:
+ DEBUG(6, ("Invalid data from client, closing connection!\n"));
+ talloc_free(cctx);
+ break;
+
+ case ENODATA:
+ DEBUG(5, ("Client disconnected!\n"));
+ talloc_free(cctx);
+ break;
+
+ default:
+ DEBUG(6, ("Failed to read request, aborting client!\n"));
+ talloc_free(cctx);
+ }
+
+ return;
+}
+
+static void client_fd_handler(struct event_context *ev,
+ struct fd_event *fde,
+ uint16_t flags, void *ptr)
+{
+ struct cli_ctx *cctx = talloc_get_type(ptr, struct cli_ctx);
+
+ if (flags & EVENT_FD_READ) {
+ client_recv(ev, cctx);
+ return;
+ }
+ if (flags & EVENT_FD_WRITE) {
+ client_send(ev, cctx);
+ return;
+ }
+}
+
+static void accept_fd_handler(struct event_context *ev,
+ struct fd_event *fde,
+ uint16_t flags, void *ptr)
+{
+ /* accept and attach new event handler */
+ struct nss_ctx *nctx = talloc_get_type(ptr, struct nss_ctx);
+ struct cli_ctx *cctx;
+ socklen_t len;
+
+ cctx = talloc_zero(nctx, struct cli_ctx);
+ if (!cctx) {
+ struct sockaddr_un addr;
+ int fd;
+ DEBUG(0, ("Out of memory trying to setup client context!\n"));
+ /* accept and close to signal the client we have a problem */
+ memset(&addr, 0, sizeof(addr));
+ len = sizeof(addr);
+ fd = accept(nctx->lfd, (struct sockaddr *)&addr, &len);
+ if (fd == -1) {
+ return;
+ }
+ close(fd);
+ return;
+ }
+
+ len = sizeof(cctx->addr);
+ cctx->cfd = accept(nctx->lfd, (struct sockaddr *)&cctx->addr, &len);
+ if (cctx->cfd == -1) {
+ DEBUG(1, ("Accept failed [%s]", strerror(errno)));
+ talloc_free(cctx);
+ return;
+ }
+
+ cctx->cfde = event_add_fd(ev, cctx, cctx->cfd,
+ EVENT_FD_READ, client_fd_handler, cctx);
+ if (!cctx->cfde) {
+ close(cctx->cfd);
+ talloc_free(cctx);
+ DEBUG(2, ("Failed to queue client handler\n"));
+ }
+
+ cctx->ev = ev;
+ cctx->nctx = nctx;
+
+ talloc_set_destructor(cctx, client_destructor);
+
+ DEBUG(4, ("Client connected!\n"));
+
+ return;
+}
+
+static int service_identity(DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+ dbus_uint16_t version = NSS_SBUS_SERVICE_VERSION;
+ const char *name = NSS_SBUS_SERVICE_NAME;
+ DBusMessage *reply;
+ dbus_bool_t ret;
+
+ DEBUG(4,("Sending ID reply: (%s,%d)\n",
+ name, version));
+
+ reply = dbus_message_new_method_return(message);
+ if (!reply) return ENOMEM;
+
+ ret = dbus_message_append_args(reply,
+ DBUS_TYPE_STRING, &name,
+ DBUS_TYPE_UINT16, &version,
+ DBUS_TYPE_INVALID);
+ if (!ret) {
+ dbus_message_unref(reply);
+ return EIO;
+ }
+
+ /* send reply back */
+ sbus_conn_send_reply(sconn, reply);
+ dbus_message_unref(reply);
+
+ return EOK;
+}
+
+static int service_pong(DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+ DBusMessage *reply;
+ dbus_bool_t ret;
+
+ reply = dbus_message_new_method_return(message);
+ if (!reply) return ENOMEM;
+
+ ret = dbus_message_append_args(reply, DBUS_TYPE_INVALID);
+ if (!ret) {
+ dbus_message_unref(reply);
+ return EIO;
+ }
+
+ /* send reply back */
+ sbus_conn_send_reply(sconn, reply);
+ dbus_message_unref(reply);
+
+ return EOK;
+}
+
+static int service_reload(DBusMessage *message, struct sbus_conn_ctx *sconn)
+{
+ /* Monitor calls this function when we need to reload
+ * our configuration information. Perform whatever steps
+ * are needed to update the configuration objects.
+ */
+
+ /* Send an empty reply to acknowledge receipt */
+ return service_pong(message, sconn);
+}
+
+static int nss_sbus_init(struct nss_ctx *nctx)
+{
+ int ret;
+ char *sbus_address;
+ struct service_sbus_ctx *ss_ctx;
+ struct sbus_method_ctx *sm_ctx;
+
+ /* Set up SBUS connection to the monitor */
+ ret = monitor_get_sbus_address(nctx, nctx->cdb, &sbus_address);
+ if (ret != EOK) {
+ DEBUG(0, ("Could not locate monitor address.\n"));
+ return ret;
+ }
+
+ ret = monitor_init_sbus_methods(nctx, nss_sbus_methods, &sm_ctx);
+ if (ret != EOK) {
+ DEBUG(0, ("Could not initialize SBUS methods.\n"));
+ return ret;
+ }
+
+ ret = sbus_client_init(nctx, nctx->ev,
+ sbus_address, sm_ctx,
+ NULL /* Private Data */,
+ NULL /* Destructor */,
+ &ss_ctx);
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to connect to monitor services.\n"));
+ return ret;
+ }
+
+ /* Set up NSS-specific listeners */
+ /* None currently used */
+
+ nctx->ss_ctx = ss_ctx;
+
+ return EOK;
+}
+
+/* create a unix socket and listen to it */
+static int set_unix_socket(struct nss_ctx *nctx)
+{
+ struct sockaddr_un addr;
+ char *default_pipe;
+ int ret;
+
+ default_pipe = talloc_asprintf(nctx, "%s/%s", PIPE_PATH, SSS_NSS_PIPE_NAME);
+ if (!default_pipe) {
+ return ENOMEM;
+ }
+
+ ret = confdb_get_string(nctx->cdb, nctx,
+ "config/services/nss", "unixSocket",
+ default_pipe, &nctx->sock_name);
+ if (ret != EOK) {
+ talloc_free(default_pipe);
+ return ret;
+ }
+ talloc_free(default_pipe);
+
+ nctx->lfd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (nctx->lfd == -1) {
+ return EIO;
+ }
+
+ /* Set the umask so that permissions are set right on the socket.
+ * It must be readable and writable by anybody on the system. */
+ umask(0111);
+
+ set_nonblocking(nctx->lfd);
+ set_close_on_exec(nctx->lfd);
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ strncpy(addr.sun_path, nctx->sock_name, sizeof(addr.sun_path));
+
+ /* make sure we have no old sockets around */
+ unlink(nctx->sock_name);
+
+ if (bind(nctx->lfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+ DEBUG(0,("Unable to bind on socket '%s'\n", nctx->sock_name));
+ goto failed;
+ }
+ if (listen(nctx->lfd, 10) != 0) {
+ DEBUG(0,("Unable to listen on socket '%s'\n", nctx->sock_name));
+ goto failed;
+ }
+
+ nctx->lfde = event_add_fd(nctx->ev, nctx, nctx->lfd,
+ EVENT_FD_READ, accept_fd_handler, nctx);
+
+ /* we want default permissions on created files to be very strict,
+ so set our umask to 0177 */
+ umask(0177);
+ return EOK;
+
+failed:
+ /* we want default permissions on created files to be very strict,
+ so set our umask to 0177 */
+ umask(0177);
+ close(nctx->lfd);
+ return EIO;
+}
+
+/* domain names are case insensitive for now
+ * NOTE: this function is not utf-8 safe,
+ * only ASCII names for now */
+static int _domain_comparator(const void *key1, const void *key2)
+{
+ return strcasecmp((const char *)key1, (const char *)key2);
+}
+
+static int nss_init_domains(struct nss_ctx *nctx)
+{
+ char *path;
+ char **domains;
+ char *provider;
+ TALLOC_CTX *tmp_ctx;
+ struct nss_domain_info *info;
+ int ret, i, c;
+ int retval;
+
+ tmp_ctx = talloc_new(nctx);
+ ret = confdb_get_domains(nctx->cdb, tmp_ctx, &domains);
+ if (ret != EOK) {
+ retval = ret;
+ goto done;
+ }
+
+ i = 0;
+ c = 0;
+ while (domains[i] != NULL) {
+ DEBUG(3, ("Adding domain %s to the map\n", domains[i]));
+
+ path = talloc_asprintf(tmp_ctx, "config/domains/%s", domains[i]);
+ if (!path) {
+ retval = ENOMEM;
+ goto done;
+ }
+
+ /* alloc on tmp_ctx, it will be stolen by btreemap_set_value */
+ info = talloc_zero(tmp_ctx, struct nss_domain_info);
+ if (!info) {
+ retval = ENOMEM;
+ goto done;
+ }
+
+ /* Build the basedn for this domain */
+ info->basedn = talloc_asprintf(info, SYSDB_DOM_BASE, domains[i]);
+ DEBUG(3, ("BaseDN: %s\n", info->basedn));
+
+ ret = confdb_get_int(nctx->cdb, tmp_ctx, path,
+ "enumerate", false, &(info->enumerate));
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to fetch enumerate for [%s]!\n", domains[i]));
+ }
+
+ ret = confdb_get_bool(nctx->cdb, tmp_ctx, path,
+ "legacy", false, &(info->legacy));
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to fetch legacy for [%s]!\n", domains[i]));
+ }
+
+ ret = confdb_get_string(nctx->cdb, tmp_ctx, path, "provider",
+ NULL, &provider);
+ if (ret != EOK) {
+ DEBUG(0, ("Failed to fetch provider for [%s]!\n", domains[i]));
+ }
+ if (provider) info->has_provider = true;
+
+ ret = btreemap_set_value(nctx, &nctx->domain_map,
+ domains[i], info,
+ _domain_comparator);
+ if (ret != EOK) {
+ DEBUG(1, ("Failed to store domain info, aborting!\n"));
+ retval = ret;
+ goto done;
+ }
+
+ i++;
+ c++;
+ }
+ if (c == 0) {
+ /* No domains configured!
+ * Note: this should never happen, since LOCAL should
+ * always be configured */
+ DEBUG(0, ("No domains configured on this client!\n"));
+ retval = EINVAL;
+ goto done;
+ }
+
+ ret = confdb_get_string(nctx->cdb, nctx,
+ "config/domains", "default",
+ NULL, &nctx->default_domain);
+ if (ret != EOK) {
+ retval = ret;
+ goto done;
+ }
+
+ retval = EOK;
+
+done:
+ talloc_free(tmp_ctx);
+ return retval;
+}
+
+int nss_process_init(TALLOC_CTX *mem_ctx,
+ struct event_context *ev,
+ struct confdb_ctx *cdb)
+{
+ struct nss_ctx *nctx;
+ int ret;
+
+ nctx = talloc_zero(mem_ctx, struct nss_ctx);
+ if (!nctx) {
+ DEBUG(0, ("fatal error initializing nss_ctx\n"));
+ return ENOMEM;
+ }
+ nctx->ev = ev;
+ nctx->cdb = cdb;
+
+ ret = nss_init_domains(nctx);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error setting up domain map\n"));
+ return ret;
+ }
+
+ ret = nss_sbus_init(nctx);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error setting up message bus\n"));
+ return ret;
+ }
+
+ ret = nss_dp_init(nctx);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error setting up backend connector\n"));
+ return ret;
+ }
+
+ ret = sysdb_init(nctx, ev, cdb, NULL, &nctx->sysdb);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error initializing nss_ctx\n"));
+ return ret;
+ }
+
+ /* after all initializations we are ready to listen on our socket */
+ ret = set_unix_socket(nctx);
+ if (ret != EOK) {
+ DEBUG(0, ("fatal error initializing socket\n"));
+ return ret;
+ }
+
+ nctx->cache_timeout = 600; /* FIXME: read from conf */
+
+ DEBUG(1, ("NSS Initialization complete\n"));
+
+ return EOK;
+}
+
+int main(int argc, const char *argv[])
+{
+ int opt;
+ poptContext pc;
+ struct main_context *main_ctx;
+ int ret;
+
+ struct poptOption long_options[] = {
+ POPT_AUTOHELP
+ SSSD_MAIN_OPTS
+ { 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... */
+ ret = server_setup("sssd[nss]", 0, &main_ctx);
+ if (ret != EOK) return 2;
+
+ ret = nss_process_init(main_ctx,
+ main_ctx->event_ctx,
+ main_ctx->confdb_ctx);
+ if (ret != EOK) return 3;
+
+ /* loop on main */
+ server_loop(main_ctx);
+
+ return 0;
+}
+
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