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#include <time.h>
#include <security/pam_modules.h>
#include <ldb.h>
#include "util/util.h"
#include "responder/pam/pamsrv.h"
#include "db/sysdb.h"
#include "util/nss_sha512crypt.h"
#define NULL_CHECK_OR_JUMP(var, msg, ret, err, label) do { \
if (var == NULL) { \
DEBUG(1, (msg)); \
ret = (err); \
goto label; \
} \
} while(0)
#define NEQ_CHECK_OR_JUMP(var, val, msg, ret, err, label) do { \
if (var != (val)) { \
DEBUG(1, (msg)); \
ret = (err); \
goto label; \
} \
} while(0)
struct LOCAL_request {
struct cli_ctx *cctx;
struct pam_data *pd;
pam_dp_callback_t callback;
struct sysdb_ctx *dbctx;
struct sss_domain_info *domain_info;
struct sysdb_attrs *mod_attrs;
struct sysdb_req *sysdb_req;
struct ldb_result *res;
int error;
};
static int authtok2str(const void *mem_ctx, uint8_t *src, const int src_size, 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';
return EOK;
}
static void prepare_reply(struct LOCAL_request *lreq)
{
if (lreq->error != EOK && lreq->pd->pam_status == PAM_SUCCESS)
lreq->pd->pam_status = PAM_SYSTEM_ERR;
lreq->callback(lreq->pd);
talloc_free(lreq);
}
static void set_user_attr_callback(void *pvt, int ldb_status, struct ldb_result *res)
{
struct LOCAL_request *lreq;
DEBUG(4, ("entering set_user_attr_callback, status [%d][%s]\n",
ldb_status, ldb_strerror(ldb_status)));
lreq = talloc_get_type(pvt, struct LOCAL_request);
sysdb_transaction_done(lreq->sysdb_req, sysdb_error_to_errno(ldb_status));
NEQ_CHECK_OR_JUMP(ldb_status, LDB_SUCCESS, ("set_user_attr failed.\n"),
lreq->error, sysdb_error_to_errno(ldb_status), done);
done:
prepare_reply(lreq);
}
static void set_user_attr_req(struct sysdb_req *req, void *pvt)
{
int ret;
struct LOCAL_request *lreq;
DEBUG(4, ("entering set_user_attr_req\n"));
lreq = talloc_get_type(pvt, struct LOCAL_request);
lreq->sysdb_req = req;
ret = sysdb_set_user_attr(req, lreq->dbctx, lreq->domain_info->name,
lreq->pd->user, lreq->mod_attrs,
set_user_attr_callback, lreq);
if (ret != EOK)
sysdb_transaction_done(lreq->sysdb_req, ret);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_set_user_attr failed.\n"),
lreq->error, ret, done);
return;
done:
prepare_reply(lreq);
}
static void do_successful_login(struct LOCAL_request *lreq)
{
int ret;
lreq->mod_attrs = sysdb_new_attrs(lreq);
NULL_CHECK_OR_JUMP(lreq->mod_attrs, ("sysdb_new_attrs failed.\n"),
lreq->error, ENOMEM, done);
ret = sysdb_attrs_add_long(lreq->mod_attrs,
SYSDB_LAST_LOGIN, (long)time(NULL));
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_attrs_add_long failed.\n"),
lreq->error, ret, done);
ret = sysdb_attrs_add_long(lreq->mod_attrs, "failedLoginAttempts", 0L);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_attrs_add_long failed.\n"),
lreq->error, ret, done);
ret = sysdb_transaction(lreq, lreq->dbctx, set_user_attr_req, lreq);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_transaction failed.\n"),
lreq->error, ret, done);
return;
done:
prepare_reply(lreq);
}
static void do_failed_login(struct LOCAL_request *lreq)
{
int ret;
int failedLoginAttempts;
lreq->pd->pam_status = PAM_AUTH_ERR;
/* TODO: maybe add more inteligent delay calculation */
lreq->pd->response_delay = 3;
lreq->mod_attrs = sysdb_new_attrs(lreq);
NULL_CHECK_OR_JUMP(lreq->mod_attrs, ("sysdb_new_attrs failed.\n"),
lreq->error, ENOMEM, done);
ret = sysdb_attrs_add_long(lreq->mod_attrs,
"lastFailedLogin", (long)time(NULL));
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_attrs_add_long failed.\n"),
lreq->error, ret, done);
failedLoginAttempts = ldb_msg_find_attr_as_int(lreq->res->msgs[0],
"failedLoginAttempts", 0);
failedLoginAttempts++;
ret = sysdb_attrs_add_long(lreq->mod_attrs,
"failedLoginAttempts",
(long)failedLoginAttempts);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_attrs_add_long failed.\n"),
lreq->error, ret, done);
ret = sysdb_transaction(lreq, lreq->dbctx, set_user_attr_req, lreq);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_transaction failed.\n"),
lreq->error, ret, done);
return;
done:
prepare_reply(lreq);
}
static void do_pam_acct_mgmt(struct LOCAL_request *lreq)
{
const char *disabled=NULL;
disabled = ldb_msg_find_attr_as_string(lreq->res->msgs[0],
SYSDB_DISABLED, NULL);
if (disabled != NULL &&
strncasecmp(disabled, "false",5)!=0 &&
strncasecmp(disabled, "no",2)!=0 ) {
lreq->pd->pam_status = PAM_PERM_DENIED;
}
prepare_reply(lreq);
}
static void do_pam_chauthtok(struct LOCAL_request *lreq)
{
int ret;
char *newauthtok;
char *salt;
char *new_hash;
ret = authtok2str(lreq, lreq->pd->newauthtok, lreq->pd->newauthtok_size,
&newauthtok);
NEQ_CHECK_OR_JUMP(ret, EOK, ("authtok2str failed.\n"),
lreq->error, ret, done);
memset(lreq->pd->newauthtok, 0, lreq->pd->newauthtok_size);
salt = gen_salt();
NULL_CHECK_OR_JUMP(salt, ("Salt generation failed.\n"),
lreq->error, EFAULT, done);
DEBUG(4, ("Using salt [%s]\n", salt));
new_hash = nss_sha512_crypt(newauthtok, salt);
NULL_CHECK_OR_JUMP(new_hash, ("Hash generation failed.\n"),
lreq->error, EFAULT, done);
DEBUG(4, ("New hash [%s]\n", new_hash));
memset(newauthtok, 0, lreq->pd->newauthtok_size);
lreq->mod_attrs = sysdb_new_attrs(lreq);
NULL_CHECK_OR_JUMP(lreq->mod_attrs, ("sysdb_new_attrs failed.\n"),
lreq->error, ENOMEM, done);
ret = sysdb_attrs_add_string(lreq->mod_attrs, SYSDB_PWD, new_hash);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_attrs_add_string failed.\n"),
lreq->error, ret, done);
ret = sysdb_attrs_add_long(lreq->mod_attrs,
"lastPasswordChange", (long)time(NULL));
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_attrs_add_long failed.\n"),
lreq->error, ret, done);
ret = sysdb_transaction(lreq, lreq->dbctx, set_user_attr_req, lreq);
NEQ_CHECK_OR_JUMP(ret, EOK, ("sysdb_transaction failed.\n"),
lreq->error, ret, done);
return;
done:
prepare_reply(lreq);
}
static void pam_handler_callback(void *pvt, int ldb_status,
struct ldb_result *res)
{
struct LOCAL_request *lreq;
const char *username = NULL;
const char *password = NULL;
char *newauthtok = NULL;
char *new_hash = NULL;
char *authtok = NULL;
int ret;
lreq = talloc_get_type(pvt, struct LOCAL_request);
DEBUG(4, ("pam_handler_callback called with ldb_status [%d].\n",
ldb_status));
NEQ_CHECK_OR_JUMP(ldb_status, LDB_SUCCESS, ("ldb search failed.\n"),
lreq->error, sysdb_error_to_errno(ldb_status), done);
if (res->count < 1) {
DEBUG(4, ("No user found with filter ["SYSDB_PWNAM_FILTER"]\n",
lreq->pd->user));
lreq->pd->pam_status = PAM_USER_UNKNOWN;
goto done;
} else if (res->count > 1) {
DEBUG(4, ("More than one object found with filter ["SYSDB_PWNAM_FILTER"]\n"));
lreq->error = EFAULT;
goto done;
}
username = ldb_msg_find_attr_as_string(res->msgs[0], SYSDB_NAME, NULL);
if (strcmp(username, lreq->pd->user) != 0) {
DEBUG(1, ("Expected username [%s] get [%s].\n", lreq->pd->user, username));
lreq->error = EINVAL;
goto done;
}
lreq->res = res;
switch (lreq->pd->cmd) {
case SSS_PAM_AUTHENTICATE:
case SSS_PAM_CHAUTHTOK:
if (lreq->pd->cmd == SSS_PAM_CHAUTHTOK && lreq->cctx->priv == 1) {
/* TODO: maybe this is a candiate for an explicit audit message. */
DEBUG(4, ("allowing root to reset a password.\n"));
break;
}
ret = authtok2str(lreq, lreq->pd->authtok,
lreq->pd->authtok_size, &authtok);
NEQ_CHECK_OR_JUMP(ret, EOK, ("authtok2str failed.\n"),
lreq->error, ret, done);
memset(lreq->pd->authtok, 0, lreq->pd->authtok_size);
password = ldb_msg_find_attr_as_string(res->msgs[0], SYSDB_PWD, NULL);
NULL_CHECK_OR_JUMP(password, ("No password stored.\n"),
lreq->error, ret, done);
DEBUG(4, ("user: [%s], password hash: [%s]\n", username, password));
new_hash = nss_sha512_crypt(authtok, password);
memset(authtok, 0, lreq->pd->authtok_size);
NULL_CHECK_OR_JUMP(new_hash, ("nss_sha512_crypt failed.\n"),
lreq->error, EFAULT, done);
DEBUG(4, ("user: [%s], new hash: [%s]\n", username, new_hash));
if (strcmp(new_hash, password) != 0) {
DEBUG(1, ("Passwords do not match.\n"));
do_failed_login(lreq);
return;
}
break;
}
switch (lreq->pd->cmd) {
case SSS_PAM_AUTHENTICATE:
do_successful_login(lreq);
return;
break;
case SSS_PAM_CHAUTHTOK:
do_pam_chauthtok(lreq);
return;
break;
case SSS_PAM_ACCT_MGMT:
do_pam_acct_mgmt(lreq);
return;
break;
case SSS_PAM_SETCRED:
break;
case SSS_PAM_OPEN_SESSION:
break;
case SSS_PAM_CLOSE_SESSION:
break;
default:
lreq->error = EINVAL;
DEBUG(1, ("Unknown PAM task [%d].\n"));
}
done:
if (lreq->pd->authtok != NULL)
memset(lreq->pd->authtok, 0, lreq->pd->authtok_size);
if (authtok != NULL)
memset(authtok, 0, lreq->pd->authtok_size);
if (lreq->pd->newauthtok != NULL)
memset(lreq->pd->newauthtok, 0, lreq->pd->newauthtok_size);
if (newauthtok != NULL)
memset(newauthtok, 0, lreq->pd->newauthtok_size);
prepare_reply(lreq);
}
int LOCAL_pam_handler(struct cli_ctx *cctx, pam_dp_callback_t callback,
struct pam_data *pd)
{
int ret;
struct LOCAL_request *lreq=NULL;
static const char *attrs[] = {SYSDB_NAME,
SYSDB_PWD,
SYSDB_DISABLED,
SYSDB_LAST_LOGIN,
"lastPasswordChange",
"accountExpires",
"failedLoginAttempts",
"passwordHint",
"passwordHistory",
"lastFailedLogin",
NULL};
lreq = talloc_zero(cctx, struct LOCAL_request);
if (!lreq) {
return ENOMEM;
}
lreq->cctx = cctx;
lreq->pd = pd;
lreq->callback = callback;
lreq->pd->pam_status = PAM_SUCCESS;
lreq->error = EOK;
DEBUG(4, ("LOCAL pam handler.\n"));
lreq->domain_info = btreemap_get_value(lreq->cctx->nctx->domain_map,
lreq->pd->domain);
NULL_CHECK_OR_JUMP(lreq->domain_info, ("Domain info not found.\n"),
ret, EINVAL, done);
lreq->dbctx = lreq->cctx->nctx->sysdb;
ret = sysdb_get_user_attr(lreq, lreq->dbctx,
lreq->domain_info, lreq->pd->user, attrs,
pam_handler_callback, lreq);
if(ret != EOK) {
DEBUG(1, ("sysdb_get_user_attr failed.\n"));
goto done;
}
return EOK;
done:
talloc_free(lreq);
return ret;
}
|