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/*
SSSD
PAM cache credentials
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 <security/pam_modules.h>
#include <time.h>
#include "util/util.h"
#include "db/sysdb.h"
#include "util/nss_sha512crypt.h"
#include "providers/data_provider.h"
#include "responder/pam/pamsrv.h"
static int authtok2str(const void *mem_ctx,
uint8_t *src, const int src_size,
char **_dest)
{
char *dest;
if ((src == NULL && src_size != 0) ||
(src != NULL && *src != '\0' && src_size == 0)) {
return EINVAL;
}
dest = talloc_size(mem_ctx, src_size + 1);
if (dest == NULL) {
return ENOMEM;
}
memcpy(dest, src, src_size);
dest[src_size]='\0';
*_dest = dest;
return EOK;
}
static void pam_cache_auth_return(struct pam_auth_req *preq, int error)
{
preq->pd->pam_status = error;
preq->callback(preq);
}
static void pam_cache_auth_callback(void *pvt, int ldb_status,
struct ldb_result *res)
{
struct pam_auth_req *preq;
struct pam_ctx *pctx;
struct pam_data *pd;
const char *userhash;
char *comphash;
char *password = NULL;
int i, ret;
uint64_t lastLogin = 0;
preq = talloc_get_type(pvt, struct pam_auth_req);
pd = preq->pd;
pctx = talloc_get_type(preq->cctx->rctx->pvt_ctx, struct pam_ctx);
if (ldb_status != LDB_SUCCESS) {
DEBUG(4, ("User info retrieval failed! (%d [%s])\n",
ldb_status, sysdb_error_to_errno(ldb_status)));
ret = PAM_SYSTEM_ERR;
goto done;
}
if (res->count == 0) {
DEBUG(4, ("User [%s@%s] not found.\n",
pd->user, preq->domain->name));
ret = PAM_USER_UNKNOWN;
goto done;
}
if (res->count != 1) {
DEBUG(4, ("Too many results for user [%s@%s].\n",
pd->user, preq->domain->name));
ret = PAM_SYSTEM_ERR;
goto done;
}
/* Check offline_auth_cache_timeout */
lastLogin = ldb_msg_find_attr_as_uint64(res->msgs[0],
SYSDB_LAST_ONLINE_AUTH,
0);
if (pctx->cred_expiration &&
lastLogin + (pctx->cred_expiration * 86400) < time(NULL)) {
DEBUG(4, ("Cached user entry is too old."));
ret = PAM_AUTHINFO_UNAVAIL;
goto done;
}
/* TODO: verify user account (failed logins, disabled, expired ...) */
ret = authtok2str(preq, pd->authtok, pd->authtok_size, &password);
if (ret) {
DEBUG(4, ("Invalid auth token.\n"));
ret = PAM_AUTH_ERR;
goto done;
}
userhash = ldb_msg_find_attr_as_string(res->msgs[0], SYSDB_CACHEDPWD, NULL);
if (userhash == NULL || *userhash == '\0') {
DEBUG(4, ("Cached credentials not available.\n"));
ret = PAM_AUTHINFO_UNAVAIL;
goto done;
}
ret = s3crypt_sha512(preq, password, userhash, &comphash);
if (ret) {
DEBUG(4, ("Failed to create password hash.\n"));
ret = PAM_SYSTEM_ERR;
goto done;
}
if (strcmp(userhash, comphash) == 0) {
/* TODO: probable good point for audit logging */
DEBUG(4, ("Hashes do match!\n"));
ret = PAM_SUCCESS;
goto done;
}
DEBUG(4, ("Authentication failed.\n"));
ret = PAM_AUTH_ERR;
done:
if (password) for (i = 0; password[i]; i++) password[i] = 0;
pam_cache_auth_return(preq, ret);
}
int pam_cache_auth(struct pam_auth_req *preq)
{
struct sysdb_ctx *sysdb;
int ret;
static const char *attrs[] = {SYSDB_NAME,
SYSDB_CACHEDPWD,
SYSDB_DISABLED,
SYSDB_LAST_LOGIN,
SYSDB_LAST_ONLINE_AUTH,
"lastCachedPasswordChange",
"accountExpires",
"failedLoginAttempts",
"lastFailedLogin",
NULL};
ret = sysdb_get_ctx_from_list(preq->cctx->rctx->db_list,
preq->domain, &sysdb);
if (ret != EOK) {
DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
return ret;
}
ret = sysdb_get_user_attr(preq, sysdb,
preq->domain, preq->pd->user, attrs,
pam_cache_auth_callback, preq);
if (ret != EOK) {
DEBUG(2, ("sysdb_get_user_attr failed.\n"));
}
return ret;
}
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