pamsrv.c revision 830ded27453015080a54d6ba85fd4999ee7e9af1
/*
SSSD
PAM Responder
Copyright (C) Simo Sorce <ssorce@redhat.com> 2009
Copyright (C) Sumit Bose <sbose@redhat.com> 2009
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 <dbus/dbus.h>
#include "util/util.h"
#include "db/sysdb.h"
#include "confdb/confdb.h"
#include "sbus/sssd_dbus.h"
#include "responder/common/responder_packet.h"
#include "providers/data_provider.h"
#include "monitor/monitor_interfaces.h"
#include "sbus/sbus_client.h"
#include "responder/pam/pamsrv.h"
#include "responder/common/negcache.h"
#include "responder/common/responder_sbus.h"
#define DEFAULT_PAM_FD_LIMIT 8192
#define ALL_UIDS_ALLOWED "all"
#define ALL_DOMAIMS_ARE_PUBLIC "all"
#define NO_DOMAIMS_ARE_PUBLIC "none"
#define DEFAULT_ALLOWED_UIDS ALL_UIDS_ALLOWED
struct mon_cli_iface monitor_pam_methods = {
{ &mon_cli_iface_meta, 0 },
.ping = monitor_common_pong,
.resInit = monitor_common_res_init,
.shutDown = NULL,
.goOffline = NULL,
.resetOffline = NULL,
.rotateLogs = responder_logrotate,
.clearMemcache = NULL,
.clearEnumCache = NULL,
.sysbusReconnect = NULL,
};
static struct data_provider_iface pam_dp_methods = {
{ &data_provider_iface_meta, 0 },
.RegisterService = NULL,
.pamHandler = NULL,
.sudoHandler = NULL,
.autofsHandler = NULL,
.hostHandler = NULL,
.getDomains = NULL,
.getAccountInfo = NULL,
};
static void pam_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(SSSDBG_CRIT_FAILURE, "Reconnected to the Data Provider.\n");
/* Identify ourselves to the data provider */
ret = dp_common_send_id(be_conn->conn,
DATA_PROVIDER_VERSION,
"PAM");
/* all fine */
if (ret == EOK) {
handle_requests_after_reconnect(be_conn->rctx);
return;
}
}
/* Handle failure */
DEBUG(SSSDBG_FATAL_FAILURE, "Could not reconnect to %s provider.\n",
be_conn->domain->name);
/* FIXME: kill the frontend and let the monitor restart it ? */
/* pam_shutdown(rctx); */
}
static errno_t get_trusted_uids(struct pam_ctx *pctx)
{
char *uid_str;
errno_t ret;
ret = confdb_get_string(pctx->rctx->cdb, pctx->rctx,
CONFDB_PAM_CONF_ENTRY, CONFDB_PAM_TRUSTED_USERS,
DEFAULT_ALLOWED_UIDS, &uid_str);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to get allowed UIDs.\n");
goto done;
}
if (strcmp(uid_str, ALL_UIDS_ALLOWED) == 0) {
DEBUG(SSSDBG_TRACE_FUNC, "All UIDs are allowed.\n");
pctx->trusted_uids_count = 0;
} else {
ret = csv_string_to_uid_array(pctx->rctx, uid_str, true,
&pctx->trusted_uids_count,
&pctx->trusted_uids);
}
talloc_free(uid_str);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to set allowed UIDs.\n");
goto done;
}
done:
return ret;
}
static errno_t get_public_domains(TALLOC_CTX *mem_ctx, struct pam_ctx *pctx)
{
char *domains_str = NULL;
errno_t ret;
ret = confdb_get_string(pctx->rctx->cdb, pctx->rctx,
CONFDB_PAM_CONF_ENTRY, CONFDB_PAM_PUBLIC_DOMAINS,
NO_DOMAIMS_ARE_PUBLIC, &domains_str);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to get allowed UIDs.\n");
goto done;
}
if (strcmp(domains_str, ALL_DOMAIMS_ARE_PUBLIC) == 0) { /* all */
/* copy all domains */
ret = get_dom_names(mem_ctx,
pctx->rctx->domains,
&pctx->public_domains,
&pctx->public_domains_count);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "get_dom_names failed.\n");
goto done;
}
} else if (strcmp(domains_str, NO_DOMAIMS_ARE_PUBLIC) == 0) { /* none */
pctx->public_domains = NULL;
pctx->public_domains_count = 0;
} else {
ret = split_on_separator(mem_ctx, domains_str, ',', true, false,
&pctx->public_domains,
&pctx->public_domains_count);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "split_on_separator failed [%d][%s].\n",
ret, strerror(ret));
goto done;
}
}
ret = EOK;
done:
talloc_free(domains_str);
return ret;
}
static int pam_process_init(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct confdb_ctx *cdb)
{
struct resp_ctx *rctx;
struct sss_cmd_table *pam_cmds;
struct be_conn *iter;
struct pam_ctx *pctx;
int ret, max_retries;
int id_timeout;
int fd_limit;
pam_cmds = get_pam_cmds();
ret = sss_process_init(mem_ctx, ev, cdb,
pam_cmds,
SSS_PAM_SOCKET_NAME,
SSS_PAM_PRIV_SOCKET_NAME,
CONFDB_PAM_CONF_ENTRY,
SSS_PAM_SBUS_SERVICE_NAME,
SSS_PAM_SBUS_SERVICE_VERSION,
&monitor_pam_methods,
"PAM", &pam_dp_methods.vtable,
&rctx);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "sss_process_init() failed\n");
return ret;
}
pctx = talloc_zero(rctx, struct pam_ctx);
if (!pctx) {
ret = ENOMEM;
goto done;
}
pctx->rctx = rctx;
pctx->rctx->pvt_ctx = pctx;
ret = get_trusted_uids(pctx);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "get_trusted_uids failed: %d:[%s].\n",
ret, sss_strerror(ret));
goto done;
}
ret = get_public_domains(pctx, pctx);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "get_public_domains failed: %d:[%s].\n",
ret, sss_strerror(ret));
goto done;
}
/* Enable automatic reconnection to the Data Provider */
/* FIXME: "retries" is too generic, either get it from a global config
* or specify these retries are about the sbus connections to DP */
ret = confdb_get_int(pctx->rctx->cdb, CONFDB_PAM_CONF_ENTRY,
CONFDB_SERVICE_RECON_RETRIES, 3, &max_retries);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Failed to set up automatic reconnection\n");
goto done;
}
for (iter = pctx->rctx->be_conns; iter; iter = iter->next) {
sbus_reconnect_init(iter->conn, max_retries,
pam_dp_reconnect_init, iter);
}
/* Set up the negative cache */
ret = confdb_get_int(cdb, CONFDB_NSS_CONF_ENTRY,
CONFDB_NSS_ENTRY_NEG_TIMEOUT, 15,
&pctx->neg_timeout);
if (ret != EOK) goto done;
/* Set up the PAM identity timeout */
ret = confdb_get_int(cdb, CONFDB_PAM_CONF_ENTRY,
CONFDB_PAM_ID_TIMEOUT, 5,
&id_timeout);
if (ret != EOK) goto done;
pctx->id_timeout = (size_t)id_timeout;
ret = sss_ncache_init(pctx, &pctx->ncache);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
"fatal error initializing negative cache\n");
goto done;
}
ret = sss_ncache_prepopulate(pctx->ncache, cdb, pctx->rctx);
if (ret != EOK) {
goto done;
}
/* Create table for initgroup lookups */
ret = sss_hash_create(pctx, 10, &pctx->id_table);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Could not create initgroups hash table: [%s]",
strerror(ret));
goto done;
}
/* Set up file descriptor limits */
ret = confdb_get_int(pctx->rctx->cdb,
CONFDB_PAM_CONF_ENTRY,
CONFDB_SERVICE_FD_LIMIT,
DEFAULT_PAM_FD_LIMIT,
&fd_limit);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Failed to set up file descriptor limit\n");
goto done;
}
responder_set_fd_limit(fd_limit);
ret = schedule_get_domains_task(rctx, rctx->ev, rctx);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE, "schedule_get_domains_tasks failed.\n");
goto done;
}
ret = EOK;
done:
if (ret != EOK) {
talloc_free(rctx);
}
return ret;
}
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);
DEBUG_INIT(debug_level);
/* set up things like debug, signals, daemonization, etc... */
debug_log_file = "sssd_pam";
ret = server_setup("sssd[pam]", 0, CONFDB_PAM_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(SSSDBG_OP_FAILURE,
"Could not set up to exit when parent process does\n");
}
ret = pam_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;
}