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/*
SSSD
IPA Backend Module -- Authentication
Authors:
Sumit Bose <sbose@redhat.com>
Copyright (C) 2009 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 <sys/param.h>
#include <security/pam_modules.h>
#include "util/util.h"
#include "providers/ldap/ldap_common.h"
#include "providers/ldap/sdap_async.h"
#include "providers/ldap/ldap_auth.h"
#include "providers/krb5/krb5_auth.h"
#include "providers/ipa/ipa_common.h"
static void ipa_auth_reply(struct be_req *be_req, int dp_err, int result)
{
be_req->fn(be_req, dp_err, result, NULL);
}
struct ipa_auth_state {
struct be_req *be_req;
struct ipa_auth_ctx *ipa_auth_ctx;
struct pam_data *pd;
};
static void ipa_auth_handler_done(struct tevent_req *req);
static void ipa_auth_ldap_done(struct tevent_req *req);
static void ipa_auth_handler_retry_done(struct tevent_req *req);
void ipa_auth(struct be_req *be_req)
{
struct tevent_req *req;
struct ipa_auth_state *state;
state = talloc_zero(be_req, struct ipa_auth_state);
if (state == NULL) {
DEBUG(1, ("talloc_zero failed.\n"));
goto fail;
}
state->be_req = be_req;
state->pd = talloc_get_type(be_req->req_data, struct pam_data);
switch (state->pd->cmd) {
case SSS_PAM_AUTHENTICATE:
state->ipa_auth_ctx = talloc_get_type(
be_req->be_ctx->bet_info[BET_AUTH].pvt_bet_data,
struct ipa_auth_ctx);
break;
case SSS_PAM_CHAUTHTOK:
case SSS_PAM_CHAUTHTOK_PRELIM:
state->ipa_auth_ctx = talloc_get_type(
be_req->be_ctx->bet_info[BET_CHPASS].pvt_bet_data,
struct ipa_auth_ctx);
break;
default:
DEBUG(1, ("Unsupported PAM task.\n"));
goto fail;
}
/* TODO: test and activate when server side support is available */
state->ipa_auth_ctx->password_migration = true;
req = krb5_auth_send(state, be_req->be_ctx->ev, be_req->be_ctx, state->pd,
state->ipa_auth_ctx->krb5_auth_ctx);
if (req == NULL) {
DEBUG(1, ("krb5_auth_send failed.\n"));
goto fail;
}
tevent_req_set_callback(req, ipa_auth_handler_done, state);
return;
fail:
state->pd->pam_status = PAM_SYSTEM_ERR;
ipa_auth_reply(be_req, DP_ERR_FATAL, state->pd->pam_status);
}
static void ipa_auth_handler_done(struct tevent_req *req)
{
struct ipa_auth_state *state = tevent_req_callback_data(req,
struct ipa_auth_state);
int ret;
int pam_status;
int dp_err;
struct dp_opt_blob password;
ret = krb5_auth_recv(req, &pam_status, &dp_err);
talloc_zfree(req);
if (ret != EOK && pam_status != PAM_CRED_ERR) {
DEBUG(1, ("krb5_auth_recv request failed.\n"));
state->pd->pam_status = PAM_SYSTEM_ERR;
dp_err = DP_ERR_OK;
goto done;
}
state->pd->pam_status = pam_status;
if (dp_err != DP_ERR_OK) {
goto done;
}
if (state->ipa_auth_ctx->password_migration &&
state->pd->cmd == SSS_PAM_AUTHENTICATE &&
state->pd->pam_status == PAM_CRED_ERR) {
state->pd->pam_status = PAM_SYSTEM_ERR;
DEBUG(1, ("Assuming Kerberos password is missing, "
"starting password migration.\n"));
password.data = state->pd->authtok;
password.length = state->pd->authtok_size;
req = auth_send(state, state->be_req->be_ctx->ev,
state->ipa_auth_ctx->sdap_auth_ctx,
state->pd->user, password);
if (req == NULL) {
DEBUG(1, ("auth_send failed.\n"));
goto done;
}
tevent_req_set_callback(req, ipa_auth_ldap_done, state);
return;
}
done:
ipa_auth_reply(state->be_req, dp_err, state->pd->pam_status);
}
static void ipa_auth_ldap_done(struct tevent_req *req)
{
struct ipa_auth_state *state = tevent_req_callback_data(req,
struct ipa_auth_state);
int ret;
int dp_err = DP_ERR_FATAL;
enum sdap_result result;
enum pwexpire pw_expire_type;
ret = auth_recv(req, state, NULL, &result, NULL, &pw_expire_type, NULL);
talloc_zfree(req);
if (ret != EOK) {
DEBUG(1, ("auth_send request failed.\n"));
state->pd->pam_status = PAM_SYSTEM_ERR;
dp_err = DP_ERR_OK;
goto done;
}
/* TODO: do we need to handle expired passwords? */
if (result != SDAP_AUTH_SUCCESS) {
DEBUG(1, ("LDAP authentication failed, "
"Password migration not possible.\n"));
state->pd->pam_status = PAM_CRED_INSUFFICIENT;
dp_err = DP_ERR_OK;
goto done;
}
DEBUG(1, ("LDAP authentication succeded, "
"trying Kerberos authentication again.\n"));
req = krb5_auth_send(state, state->be_req->be_ctx->ev,
state->be_req->be_ctx, state->pd,
state->ipa_auth_ctx->krb5_auth_ctx);
if (req == NULL) {
DEBUG(1, ("krb5_auth_send failed.\n"));
goto done;
}
tevent_req_set_callback(req, ipa_auth_handler_retry_done, state);
return;
done:
ipa_auth_reply(state->be_req, dp_err, state->pd->pam_status);
}
static void ipa_auth_handler_retry_done(struct tevent_req *req)
{
struct ipa_auth_state *state = tevent_req_callback_data(req,
struct ipa_auth_state);
int ret;
int pam_status;
int dp_err;
ret = krb5_auth_recv(req, &pam_status, &dp_err);
talloc_zfree(req);
if (ret != EOK) {
DEBUG(1, ("krb5_auth_recv request failed.\n"));
state->pd->pam_status = PAM_SYSTEM_ERR;
dp_err = DP_ERR_OK;
goto done;
}
state->pd->pam_status = pam_status;
done:
ipa_auth_reply(state->be_req, dp_err, state->pd->pam_status);
}
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