sdap_async_sudo.c revision 21d485184df986e1a123f70c689517386e51a5ce
/*
SSSD
Async LDAP Helper routines for sudo
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2012 Red Hat
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 <errno.h>
#include <talloc.h>
#include <tevent.h>
#include "providers/dp_backend.h"
#include "providers/ldap/ldap_common.h"
#include "providers/ldap/sdap.h"
#include "providers/ldap/sdap_async.h"
#include "providers/ldap/sdap_sudo.h"
#include "providers/ldap/sdap_sudo_cache.h"
#include "db/sysdb_sudo.h"
struct sdap_sudo_refresh_state {
struct be_ctx *be_ctx;
struct sdap_options *opts;
struct sdap_id_op *sdap_op;
struct sdap_id_conn_cache *sdap_conn_cache;
struct sysdb_ctx *sysdb;
struct sss_domain_info *domain;
const char *ldap_filter; /* search */
const char *sysdb_filter; /* delete */
int dp_error;
int error;
char *highest_usn;
size_t num_rules;
};
struct sdap_sudo_load_sudoers_state {
struct tevent_context *ev;
struct sdap_options *opts;
struct sdap_handle *sh;
struct sysdb_attrs **ldap_rules; /* search result will be stored here */
size_t ldap_rules_count; /* search result will be stored here */
const char **attrs;
const char *filter;
size_t base_iter;
struct sdap_search_base **search_bases;
int timeout;
};
static int sdap_sudo_refresh_retry(struct tevent_req *req);
static void sdap_sudo_refresh_connect_done(struct tevent_req *subreq);
static struct tevent_req * sdap_sudo_load_sudoers_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct sdap_options *opts,
struct sdap_handle *sh,
const char *ldap_filter);
static errno_t sdap_sudo_load_sudoers_next_base(struct tevent_req *req);
static void sdap_sudo_load_sudoers_process(struct tevent_req *subreq);
static int sdap_sudo_load_sudoers_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
size_t *rules_count,
struct sysdb_attrs ***rules);
static void sdap_sudo_load_sudoers_done(struct tevent_req *subreq);
static int sdap_sudo_purge_sudoers(struct sysdb_ctx *sysdb_ctx,
const char *filter,
struct sdap_attr_map *map,
size_t rules_count,
struct sysdb_attrs **rules);
static int sdap_sudo_store_sudoers(TALLOC_CTX *mem_ctx,
struct sysdb_ctx *sysdb_ctx,
struct sdap_options *opts,
size_t rules_count,
struct sysdb_attrs **rules,
int cache_timeout,
time_t now,
char **_usn);
struct tevent_req *sdap_sudo_refresh_send(TALLOC_CTX *mem_ctx,
struct be_ctx *be_ctx,
struct sdap_options *opts,
struct sdap_id_conn_cache *conn_cache,
const char *ldap_filter,
const char *sysdb_filter)
{
struct tevent_req *req = NULL;
struct sdap_sudo_refresh_state *state = NULL;
int ret;
req = tevent_req_create(mem_ctx, &state, struct sdap_sudo_refresh_state);
if (!req) {
return NULL;
}
/* if we don't have a search filter, this request is meaningless */
if (ldap_filter == NULL) {
ret = EINVAL;
goto immediately;
}
state->be_ctx = be_ctx;
state->opts = opts;
state->sdap_op = NULL;
state->sdap_conn_cache = conn_cache;
state->sysdb = be_ctx->sysdb;
state->domain = be_ctx->domain;
state->ldap_filter = talloc_strdup(state, ldap_filter);
state->sysdb_filter = talloc_strdup(state, sysdb_filter);
state->dp_error = DP_ERR_OK;
state->error = EOK;
state->highest_usn = NULL;
if (state->ldap_filter == NULL) {
ret = ENOMEM;
goto immediately;
}
if (sysdb_filter != NULL && state->sysdb_filter == NULL) {
ret = ENOMEM;
goto immediately;
}
ret = sdap_sudo_refresh_retry(req);
if (ret == EAGAIN) {
/* asynchronous processing */
return req;
}
immediately:
if (ret == EOK) {
tevent_req_done(req);
} else {
tevent_req_error(req, ret);
}
tevent_req_post(req, be_ctx->ev);
return req;
}
int sdap_sudo_refresh_recv(TALLOC_CTX *mem_ctx,
struct tevent_req *req,
int *dp_error,
int *error,
char **usn,
size_t *num_rules)
{
struct sdap_sudo_refresh_state *state = NULL;
state = tevent_req_data(req, struct sdap_sudo_refresh_state);
TEVENT_REQ_RETURN_ON_ERROR(req);
*dp_error = state->dp_error;
*error = state->error;
if (usn != NULL && state->highest_usn != NULL) {
*usn = talloc_steal(mem_ctx, state->highest_usn);
}
if (num_rules != NULL) {
*num_rules = state->num_rules;
}
return EOK;
}
static int sdap_sudo_refresh_retry(struct tevent_req *req)
{
struct tevent_req *subreq = NULL;
struct sdap_sudo_refresh_state *state = NULL;
int ret;
state = tevent_req_data(req, struct sdap_sudo_refresh_state);
if (be_is_offline(state->be_ctx)) {
state->dp_error = DP_ERR_OFFLINE;
state->error = EAGAIN;
return EOK;
}
if (state->sdap_op == NULL) {
state->sdap_op = sdap_id_op_create(state, state->sdap_conn_cache);
if (state->sdap_op == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("sdap_id_op_create() failed\n"));
state->dp_error = DP_ERR_FATAL;
state->error = EIO;
return EIO;
}
}
subreq = sdap_id_op_connect_send(state->sdap_op, state, &ret);
if (subreq == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
("sdap_id_op_connect_send() failed: %d(%s)\n", ret, strerror(ret)));
talloc_zfree(state->sdap_op);
state->dp_error = DP_ERR_FATAL;
state->error = ret;
return ret;
}
tevent_req_set_callback(subreq, sdap_sudo_refresh_connect_done, req);
return EAGAIN;
}
static void sdap_sudo_refresh_connect_done(struct tevent_req *subreq)
{
struct tevent_req *req = NULL; /* req from sdap_sudo_refresh_send() */
struct sdap_sudo_refresh_state *state = NULL;
int dp_error;
int ret;
req = tevent_req_callback_data(subreq, struct tevent_req);
state = tevent_req_data(req, struct sdap_sudo_refresh_state);
ret = sdap_id_op_connect_recv(subreq, &dp_error);
talloc_zfree(subreq);
if (dp_error == DP_ERR_OFFLINE) {
talloc_zfree(state->sdap_op);
state->dp_error = DP_ERR_OFFLINE;
state->error = EAGAIN;
tevent_req_done(req);
return;
} else if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("SUDO LDAP connection failed - %s\n", strerror(ret)));
goto fail;
}
DEBUG(SSSDBG_TRACE_FUNC, ("SUDO LDAP connection successful\n"));
subreq = sdap_sudo_load_sudoers_send(state, state->be_ctx->ev,
state->opts,
sdap_id_op_handle(state->sdap_op),
state->ldap_filter);
if (subreq == NULL) {
ret = EFAULT;
goto fail;
}
tevent_req_set_callback(subreq, sdap_sudo_load_sudoers_done, req);
return;
fail:
state->dp_error = DP_ERR_FATAL;
state->error = ret;
tevent_req_error(req, ret);
}
static struct tevent_req * sdap_sudo_load_sudoers_send(TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct sdap_options *opts,
struct sdap_handle *sh,
const char *ldap_filter)
{
struct tevent_req *req = NULL;
struct sdap_sudo_load_sudoers_state *state = NULL;
int ret;
req = tevent_req_create(mem_ctx, &state, struct sdap_sudo_load_sudoers_state);
if (!req) {
return NULL;
}
state->ev = ev;
state->opts = opts;
state->sh = sh;
state->base_iter = 0;
state->search_bases = opts->sudo_search_bases;
state->filter = ldap_filter;
state->timeout = dp_opt_get_int(opts->basic, SDAP_SEARCH_TIMEOUT);
state->ldap_rules = NULL;
state->ldap_rules_count = 0;
if (!state->search_bases) {
DEBUG(SSSDBG_CRIT_FAILURE,
("SUDOERS lookup request without a search base\n"));
ret = EINVAL;
goto done;
}
/* create attrs from map */
ret = build_attrs_from_map(state, opts->sudorule_map, SDAP_OPTS_SUDO,
NULL, &state->attrs, NULL);
if (ret != EOK) {
goto fail;
}
/* begin search */
ret = sdap_sudo_load_sudoers_next_base(req);
done:
if (ret != EOK) {
tevent_req_error(req, ret);
tevent_req_post(req, ev);
}
return req;
fail:
talloc_zfree(req);
return NULL;
}
static errno_t sdap_sudo_load_sudoers_next_base(struct tevent_req *req)
{
struct tevent_req *subreq = NULL;
struct sdap_sudo_load_sudoers_state *state = NULL;
struct sdap_search_base *search_base = NULL;
char *filter = NULL;
state = tevent_req_data(req, struct sdap_sudo_load_sudoers_state);
search_base = state->search_bases[state->base_iter];
if (search_base == NULL) {
/* should not happen */
DEBUG(SSSDBG_CRIT_FAILURE, ("search_base is null\n"));
return EFAULT;
}
/* create filter */
filter = sdap_get_id_specific_filter(state, state->filter,
search_base->filter);
if (filter == NULL) {
return ENOMEM;
}
/* send request */
DEBUG(SSSDBG_TRACE_FUNC,
("Searching for sudo rules with base [%s]\n",
search_base->basedn));
subreq = sdap_get_generic_send(state,
state->ev,
state->opts,
state->sh,
search_base->basedn,
search_base->scope,
filter,
state->attrs,
state->opts->sudorule_map,
SDAP_OPTS_SUDO,
state->timeout,
true);
if (subreq == NULL) {
return ENOMEM;
}
tevent_req_set_callback(subreq, sdap_sudo_load_sudoers_process, req);
return EOK;
}
static void sdap_sudo_load_sudoers_process(struct tevent_req *subreq)
{
struct tevent_req *req = NULL;
struct sdap_sudo_load_sudoers_state *state = NULL;
struct sdap_search_base *search_base = NULL;
struct sysdb_attrs **attrs = NULL;
size_t count;
int ret;
int i;
req = tevent_req_callback_data(subreq, struct tevent_req);
state = tevent_req_data(req, struct sdap_sudo_load_sudoers_state);
search_base = state->search_bases[state->base_iter];
DEBUG(SSSDBG_TRACE_FUNC,
("Receiving sudo rules with base [%s]\n",
search_base->basedn));
ret = sdap_get_generic_recv(subreq, state, &count, &attrs);
talloc_zfree(subreq);
if (ret) {
tevent_req_error(req, ret);
return;
}
/* add rules to result */
if (count > 0) {
state->ldap_rules = talloc_realloc(state, state->ldap_rules,
struct sysdb_attrs *,
state->ldap_rules_count + count);
if (state->ldap_rules == NULL) {
tevent_req_error(req, ENOMEM);
return;
}
for (i = 0; i < count; i++) {
state->ldap_rules[state->ldap_rules_count + i] = talloc_steal(
state->ldap_rules, attrs[i]);
}
state->ldap_rules_count += count;
}
/* go to next base */
state->base_iter++;
if (state->search_bases[state->base_iter]) {
ret = sdap_sudo_load_sudoers_next_base(req);
if (ret != EOK) {
tevent_req_error(req, ret);
}
return;
}
/* we are done */
tevent_req_done(req);
}
static int sdap_sudo_load_sudoers_recv(struct tevent_req *req,
TALLOC_CTX *mem_ctx,
size_t *rules_count,
struct sysdb_attrs ***rules)
{
struct sdap_sudo_load_sudoers_state *state = NULL;
state = tevent_req_data(req, struct sdap_sudo_load_sudoers_state);
TEVENT_REQ_RETURN_ON_ERROR(req);
*rules_count = state->ldap_rules_count;
*rules = talloc_steal(mem_ctx, state->ldap_rules);
return EOK;
}
static void sdap_sudo_load_sudoers_done(struct tevent_req *subreq)
{
struct tevent_req *req = NULL; /* req from sdap_sudo_refresh_send() */
struct sdap_sudo_refresh_state *state = NULL;
struct sysdb_attrs **rules = NULL;
size_t rules_count = 0;
int ret;
errno_t sret;
bool in_transaction = false;
time_t now;
req = tevent_req_callback_data(subreq, struct tevent_req);
state = tevent_req_data(req, struct sdap_sudo_refresh_state);
ret = sdap_sudo_load_sudoers_recv(subreq, state, &rules_count, &rules);
talloc_zfree(subreq);
if (ret != EOK) {
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC, ("Received %d rules\n", rules_count));
/* start transaction */
ret = sysdb_transaction_start(state->sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to start transaction\n"));
goto done;
}
in_transaction = true;
/* purge cache */
ret = sdap_sudo_purge_sudoers(state->sysdb, state->sysdb_filter,
state->opts->sudorule_map, rules_count, rules);
if (ret != EOK) {
goto done;
}
/* store rules */
now = time(NULL);
ret = sdap_sudo_store_sudoers(state, state->sysdb, state->opts, rules_count,
rules, state->domain->sudo_timeout, now,
&state->highest_usn);
if (ret != EOK) {
goto done;
}
/* commit transaction */
ret = sysdb_transaction_commit(state->sysdb);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Failed to commit transaction\n"));
goto done;
}
in_transaction = false;
DEBUG(SSSDBG_TRACE_FUNC, ("Sudoers is successfuly stored in cache\n"));
ret = EOK;
state->num_rules = rules_count;
done:
if (in_transaction) {
sret = sysdb_transaction_cancel(state->sysdb);
if (sret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("Could not cancel transaction\n"));
}
}
state->error = ret;
if (ret == EOK) {
state->dp_error = DP_ERR_OK;
tevent_req_done(req);
} else {
state->dp_error = DP_ERR_FATAL;
tevent_req_error(req, ret);
}
}
static int sdap_sudo_purge_sudoers(struct sysdb_ctx *sysdb_ctx,
const char *filter,
struct sdap_attr_map *map,
size_t rules_count,
struct sysdb_attrs **rules)
{
const char *name;
int i;
errno_t ret;
if (filter == NULL) {
/* removes downloaded rules from the cache */
if (rules_count == 0 || rules == NULL) {
return EOK;
}
for (i = 0; i < rules_count; i++) {
ret = sysdb_attrs_get_string(rules[i],
map[SDAP_AT_SUDO_NAME].sys_name,
&name);
if (ret != EOK) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Failed to retrieve rule name: [%s]\n", strerror(ret)));
continue;
}
ret = sysdb_sudo_purge_byname(sysdb_ctx, name);
if (ret != EOK) {
DEBUG(SSSDBG_MINOR_FAILURE,
("Failed to delete rule %s: [%s]\n",
name, strerror(ret)));
continue;
}
}
} else {
/* purge cache by provided filter */
ret = sysdb_sudo_purge_byfilter(sysdb_ctx, filter);
if (ret != EOK) {
goto done;
}
}
done:
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("failed to purge sudo rules [%d]: %s\n",
ret, strerror(ret)));
}
return ret;
}
static int sdap_sudo_store_sudoers(TALLOC_CTX *mem_ctx,
struct sysdb_ctx *sysdb_ctx,
struct sdap_options *opts,
size_t rules_count,
struct sysdb_attrs **rules,
int cache_timeout,
time_t now,
char **_usn)
{
errno_t ret;
/* Empty sudoers? Done. */
if (rules_count == 0 || rules == NULL) {
return EOK;
}
ret = sdap_save_native_sudorule_list(mem_ctx, sysdb_ctx, opts->sudorule_map,
rules, rules_count, cache_timeout, now,
_usn);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("failed to save sudo rules [%d]: %s\n",
ret, strerror(ret)));
return ret;
}
return EOK;
}