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/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2015 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 <time.h>
#include <talloc.h>
#include "util/util.h"
#include "providers/be_ptask.h"
#include "providers/ldap/sdap.h"
#include "providers/ldap/sdap_sudo_shared.h"
#include "db/sysdb_sudo.h"
errno_t
sdap_sudo_ptask_setup_generic(struct be_ctx *be_ctx,
struct dp_option *opts,
be_ptask_send_t full_send_fn,
be_ptask_recv_t full_recv_fn,
be_ptask_send_t smart_send_fn,
be_ptask_recv_t smart_recv_fn,
void *pvt)
{
time_t smart;
time_t full;
time_t delay;
time_t last_refresh;
errno_t ret;
smart = dp_opt_get_int(opts, SDAP_SUDO_SMART_REFRESH_INTERVAL);
full = dp_opt_get_int(opts, SDAP_SUDO_FULL_REFRESH_INTERVAL);
if (smart == 0 && full == 0) {
/* We don't allow both types to be disabled. At least smart refresh
* needs to be enabled. In this case smart refresh will catch up new
* and modified rules and deleted rules are caught when expired. */
smart = opts[SDAP_SUDO_SMART_REFRESH_INTERVAL].def_val.number;
DEBUG(SSSDBG_CONF_SETTINGS, "At least smart refresh needs to be "
"enabled. Setting smart refresh interval to default value "
"(%ld) seconds.\n", smart);
} else if (full > 0 && full <= smart) {
/* In this case it does not make any sense to run smart refresh. */
smart = 0;
DEBUG(SSSDBG_CONF_SETTINGS, "Smart refresh interval has to be lower "
"than full refresh interval. Periodical smart refresh will be "
"disabled.\n");
}
ret = sysdb_sudo_get_last_full_refresh(be_ctx->domain, &last_refresh);
if (ret != EOK) {
DEBUG(SSSDBG_MINOR_FAILURE, "Unable to obtain time of last full "
"refresh. Assuming none was performed so far.\n");
last_refresh = 0;
}
if (last_refresh == 0) {
/* If this is the first startup, we need to kick off an refresh
* immediately, to close a window where clients requesting sudo
* information won't get an immediate reply with no entries */
delay = 0;
} else {
/* At least one update has previously run, so clients will get cached
* data. We will delay the refresh so we don't slow down the startup
* process if this is happening during system boot. */
delay = 10;
}
/* Full refresh.
*
* Disable when offline and run immediately when SSSD goes back online.
* Since we have periodical online check we don't have to run this task
* when offline. */
if (full > 0) {
ret = be_ptask_create(be_ctx, be_ctx, full, delay, 0, 0, full,
BE_PTASK_OFFLINE_DISABLE, 0,
full_send_fn, full_recv_fn, pvt,
"SUDO Full Refresh", NULL);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to setup full refresh ptask "
"[%d]: %s\n", ret, sss_strerror(ret));
return ret;
}
}
/* Smart refresh.
*
* Disable when offline and reschedule normally when SSSD goes back online.
* Since we have periodical online check we don't have to run this task
* when offline. */
if (smart > 0) {
ret = be_ptask_create(be_ctx, be_ctx, smart, delay + smart, smart, 0,
smart, BE_PTASK_OFFLINE_DISABLE, 0,
smart_send_fn, smart_recv_fn, pvt,
"SUDO Smart Refresh", NULL);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Unable to setup smart refresh ptask "
"[%d]: %s\n", ret, sss_strerror(ret));
return ret;
}
}
return EOK;
}
static char *
sdap_sudo_new_usn(TALLOC_CTX *mem_ctx,
unsigned long usn,
const char *leftover)
{
const char *str = leftover == NULL ? "" : leftover;
char *newusn;
/* We increment USN number so that we can later use simplify filter
* (just usn >= last+1 instaed of usn >= last && usn != last).
*/
usn++;
/* Convert back to string appending non-converted values since it
* is an indicator that modifyTimestamp is used instead of entryUSN.
* modifyTimestamp contains also timezone specification, usually Z.
* We can't really handle any errors here so we just use what we got. */
newusn = talloc_asprintf(mem_ctx, "%lu%s", usn, str);
if (newusn == NULL) {
DEBUG(SSSDBG_MINOR_FAILURE, "Unable to change USN value (OOM)!\n");
return NULL;
}
return newusn;
}
void
sdap_sudo_set_usn(struct sdap_server_opts *srv_opts,
const char *usn)
{
unsigned long usn_number;
char *newusn;
char *endptr = NULL;
errno_t ret;
if (srv_opts == NULL) {
DEBUG(SSSDBG_TRACE_FUNC, "Bug: srv_opts is NULL\n");
return;
}
if (usn == NULL) {
DEBUG(SSSDBG_TRACE_FUNC, "Bug: usn is NULL\n");
return;
}
errno = 0;
usn_number = strtoul(usn, &endptr, 10);
if (errno != 0) {
ret = errno;
DEBUG(SSSDBG_MINOR_FAILURE, "Unable to convert USN %s [%d]: %s\n",
usn, ret, sss_strerror(ret));
return;
}
newusn = sdap_sudo_new_usn(srv_opts, usn_number, endptr);
if (newusn == NULL) {
return;
}
if (sysdb_compare_usn(newusn, srv_opts->max_sudo_value) > 0) {
talloc_zfree(srv_opts->max_sudo_value);
srv_opts->max_sudo_value = newusn;
} else {
talloc_zfree(newusn);
}
if (usn_number > srv_opts->last_usn) {
srv_opts->last_usn = usn_number;
}
DEBUG(SSSDBG_FUNC_DATA, "SUDO higher USN value: [%s]\n",
srv_opts->max_sudo_value);
}
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