/src/responder/nss/nsssrv.c
C | 426 lines | 326 code | 65 blank | 35 comment | 74 complexity | 116c5668d8135ea3faf18ceca7f10eae MD5 | raw file
- /*
- 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 "responder/nss/nsssrv_mmap_cache.h"
- #include "responder/common/negcache.h"
- #include "db/sysdb.h"
- #include "confdb/confdb.h"
- #include "dbus/dbus.h"
- #include "sbus/sssd_dbus.h"
- #include "responder/common/responder_packet.h"
- #include "responder/common/responder.h"
- #include "providers/data_provider.h"
- #include "monitor/monitor_interfaces.h"
- #include "sbus/sbus_client.h"
- #define DEFAULT_PWFIELD "*"
- #define DEFAULT_NSS_FD_LIMIT 8192
- #define SHELL_REALLOC_INCREMENT 5
- #define SHELL_REALLOC_MAX 50
- struct sbus_method monitor_nss_methods[] = {
- { MON_CLI_METHOD_PING, monitor_common_pong },
- { MON_CLI_METHOD_RES_INIT, monitor_common_res_init },
- { MON_CLI_METHOD_ROTATE, responder_logrotate },
- { NULL, NULL }
- };
- struct sbus_interface monitor_nss_interface = {
- MONITOR_INTERFACE,
- MONITOR_PATH,
- SBUS_DEFAULT_VTABLE,
- monitor_nss_methods,
- NULL
- };
- static errno_t nss_get_etc_shells(TALLOC_CTX *mem_ctx, char ***_shells)
- {
- int i = 0;
- char *sh;
- char **shells = NULL;
- TALLOC_CTX *tmp_ctx;
- errno_t ret;
- int size;
- tmp_ctx = talloc_new(NULL);
- if (!tmp_ctx) return ENOMEM;
- shells = talloc_array(tmp_ctx, char *, SHELL_REALLOC_INCREMENT);
- if (!shells) {
- ret = ENOMEM;
- goto done;
- }
- size = SHELL_REALLOC_INCREMENT;
- setusershell();
- while ((sh = getusershell())) {
- shells[i] = talloc_strdup(shells, sh);
- if (!shells[i]) {
- endusershell();
- ret = ENOMEM;
- goto done;
- }
- DEBUG(6, ("Found shell %s in /etc/shells\n", shells[i]));
- i++;
- if (i == size) {
- size += SHELL_REALLOC_INCREMENT;
- if (size > SHELL_REALLOC_MAX) {
- DEBUG(0, ("Reached maximum number of shells [%d]. "
- "Users may be denied access. "
- "Please check /etc/shells for sanity\n",
- SHELL_REALLOC_MAX));
- break;
- }
- shells = talloc_realloc(NULL, shells, char *,
- size);
- if (!shells) {
- ret = ENOMEM;
- goto done;
- }
- }
- }
- endusershell();
- if (i + 1 < size) {
- shells = talloc_realloc(NULL, shells, char *, i + 1);
- if (!shells) {
- ret = ENOMEM;
- goto done;
- }
- }
- shells[i] = NULL;
- *_shells = talloc_move(mem_ctx, &shells);
- ret = EOK;
- done:
- talloc_zfree(tmp_ctx);
- return ret;
- }
- static int nss_get_config(struct nss_ctx *nctx,
- struct confdb_ctx *cdb)
- {
- int ret;
- ret = confdb_get_int(cdb, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_ENUM_CACHE_TIMEOUT, 120,
- &nctx->enum_cache_timeout);
- if (ret != EOK) goto done;
- ret = confdb_get_int(cdb, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_ENTRY_NEG_TIMEOUT, 15,
- &nctx->neg_timeout);
- if (ret != EOK) goto done;
- ret = confdb_get_bool(cdb, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_FILTER_USERS_IN_GROUPS, true,
- &nctx->filter_users_in_groups);
- if (ret != EOK) goto done;
- ret = confdb_get_int(cdb, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_ENTRY_CACHE_NOWAIT_PERCENTAGE, 50,
- &nctx->cache_refresh_percent);
- if (ret != EOK) goto done;
- if (nctx->cache_refresh_percent < 0 ||
- nctx->cache_refresh_percent > 99) {
- DEBUG(0,("Configuration error: entry_cache_nowait_percentage is "
- "invalid. Disabling feature.\n"));
- nctx->cache_refresh_percent = 0;
- }
- ret = sss_ncache_prepopulate(nctx->ncache, cdb, nctx->rctx);
- if (ret != EOK) {
- goto done;
- }
- ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_PWFIELD, DEFAULT_PWFIELD,
- &nctx->pwfield);
- if (ret != EOK) goto done;
- ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_OVERRIDE_HOMEDIR, NULL,
- &nctx->override_homedir);
- if (ret != EOK) goto done;
- ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_FALLBACK_HOMEDIR, NULL,
- &nctx->fallback_homedir);
- if (ret != EOK) goto done;
- ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_OVERRIDE_SHELL, NULL,
- &nctx->override_shell);
- if (ret != EOK && ret != ENOENT) goto done;
- ret = confdb_get_string_as_list(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_ALLOWED_SHELL,
- &nctx->allowed_shells);
- if (ret != EOK && ret != ENOENT) goto done;
- ret = confdb_get_string_as_list(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_VETOED_SHELL,
- &nctx->vetoed_shells);
- if (ret != EOK && ret != ENOENT) goto done;
- ret = nss_get_etc_shells(nctx, &nctx->etc_shells);
- if (ret != EOK) goto done;
- ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_SHELL_FALLBACK,
- CONFDB_DEFAULT_SHELL_FALLBACK,
- &nctx->shell_fallback);
- if (ret != EOK) goto done;
- ret = confdb_get_string(cdb, nctx, CONFDB_NSS_CONF_ENTRY,
- CONFDB_NSS_DEFAULT_SHELL,
- NULL,
- &nctx->default_shell);
- if (ret != EOK) goto done;
- ret = 0;
- done:
- return ret;
- }
- static struct sbus_method nss_dp_methods[] = {
- { NULL, NULL }
- };
- struct sbus_interface nss_dp_interface = {
- DP_INTERFACE,
- DP_PATH,
- SBUS_DEFAULT_VTABLE,
- nss_dp_methods,
- NULL
- };
- static void nss_dp_reconnect_init(struct sbus_connection *conn,
- int status, void *pvt)
- {
- struct be_conn *be_conn = talloc_get_type(pvt, struct be_conn);
- int ret;
- /* Did we reconnect successfully? */
- if (status == SBUS_RECONNECT_SUCCESS) {
- DEBUG(1, ("Reconnected to the Data Provider.\n"));
- /* Identify ourselves to the data provider */
- ret = dp_common_send_id(be_conn->conn,
- DATA_PROVIDER_VERSION,
- "NSS");
- /* all fine */
- if (ret == EOK) {
- handle_requests_after_reconnect(be_conn->rctx);
- return;
- }
- }
- /* Failed to reconnect */
- DEBUG(0, ("Could not reconnect to %s provider.\n",
- be_conn->domain->name));
- /* FIXME: kill the frontend and let the monitor restart it ? */
- /* nss_shutdown(rctx); */
- }
- int nss_process_init(TALLOC_CTX *mem_ctx,
- struct tevent_context *ev,
- struct confdb_ctx *cdb)
- {
- struct sss_cmd_table *nss_cmds;
- struct be_conn *iter;
- struct nss_ctx *nctx;
- int memcache_timeout;
- int ret, max_retries;
- int hret;
- int fd_limit;
- nctx = talloc_zero(mem_ctx, struct nss_ctx);
- if (!nctx) {
- DEBUG(0, ("fatal error initializing nss_ctx\n"));
- return ENOMEM;
- }
- ret = sss_ncache_init(nctx, &nctx->ncache);
- if (ret != EOK) {
- DEBUG(0, ("fatal error initializing negative cache\n"));
- return ret;
- }
- nss_cmds = get_nss_cmds();
- ret = sss_process_init(nctx, ev, cdb,
- nss_cmds,
- SSS_NSS_SOCKET_NAME, NULL,
- CONFDB_NSS_CONF_ENTRY,
- NSS_SBUS_SERVICE_NAME,
- NSS_SBUS_SERVICE_VERSION,
- &monitor_nss_interface,
- "NSS", &nss_dp_interface,
- &nctx->rctx);
- if (ret != EOK) {
- return ret;
- }
- nctx->rctx->pvt_ctx = nctx;
- ret = nss_get_config(nctx, cdb);
- if (ret != EOK) {
- DEBUG(0, ("fatal error getting nss config\n"));
- return ret;
- }
- /* Enable automatic reconnection to the Data Provider */
- ret = confdb_get_int(nctx->rctx->cdb,
- CONFDB_NSS_CONF_ENTRY,
- CONFDB_SERVICE_RECON_RETRIES,
- 3, &max_retries);
- if (ret != EOK) {
- DEBUG(0, ("Failed to set up automatic reconnection\n"));
- return ret;
- }
- for (iter = nctx->rctx->be_conns; iter; iter = iter->next) {
- sbus_reconnect_init(iter->conn, max_retries,
- nss_dp_reconnect_init, iter);
- }
- /* Create the lookup table for netgroup results */
- hret = sss_hash_create(nctx, 10, &nctx->netgroups);
- if (hret != HASH_SUCCESS) {
- DEBUG(0,("Unable to initialize netgroup hash table\n"));
- return EIO;
- }
- /* create mmap caches */
- ret = confdb_get_int(nctx->rctx->cdb,
- CONFDB_NSS_CONF_ENTRY,
- CONFDB_MEMCACHE_TIMEOUT,
- 300, &memcache_timeout);
- if (ret != EOK) {
- DEBUG(0, ("Failed to set up automatic reconnection\n"));
- return ret;
- }
- /* TODO: read cache sizes from configuration */
- ret = sss_mmap_cache_init(nctx, "passwd", SSS_MC_PASSWD,
- 50000, (time_t)memcache_timeout,
- &nctx->pwd_mc_ctx);
- if (ret) {
- DEBUG(SSSDBG_CRIT_FAILURE, ("passwd mmap cache is DISABLED\n"));
- }
- ret = sss_mmap_cache_init(nctx, "group", SSS_MC_GROUP,
- 50000, (time_t)memcache_timeout,
- &nctx->grp_mc_ctx);
- if (ret) {
- DEBUG(SSSDBG_CRIT_FAILURE, ("group mmap cache is DISABLED\n"));
- }
- /* Set up file descriptor limits */
- ret = confdb_get_int(nctx->rctx->cdb,
- CONFDB_NSS_CONF_ENTRY,
- CONFDB_SERVICE_FD_LIMIT,
- DEFAULT_NSS_FD_LIMIT,
- &fd_limit);
- if (ret != EOK) {
- DEBUG(SSSDBG_FATAL_FAILURE,
- ("Failed to set up file descriptor limit\n"));
- return ret;
- }
- responder_set_fd_limit(fd_limit);
- DEBUG(SSSDBG_TRACE_FUNC, ("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
- POPT_TABLEEND
- };
- /* Set debug level to invalid value so we can deside if -d 0 was used. */
- debug_level = SSSDBG_INVALID;
- 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);
- CONVERT_AND_SET_DEBUG_LEVEL(debug_level);
- /* set up things like debug, signals, daemonization, etc... */
- debug_log_file = "sssd_nss";
- ret = server_setup("sssd[nss]", 0, CONFDB_NSS_CONF_ENTRY, &main_ctx);
- if (ret != EOK) return 2;
- ret = die_if_parent_died();
- if (ret != EOK) {
- /* This is not fatal, don't return */
- DEBUG(2, ("Could not set up to exit when parent process does\n"));
- }
- 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;
- }