static errno_t
ssh_user_pubkeys_search(struct ssh_cmd_ctx *cmd_ctx)
{
struct tevent_req *req;
struct dp_callback_ctx *cb_ctx;
/* if it is a domainless search, skip domains that require fully
* qualified names instead */
while (cmd_ctx->domain && cmd_ctx->check_next && cmd_ctx->domain->fqnames) {
cmd_ctx->domain = get_next_domain(cmd_ctx->domain, false);
}
if (!cmd_ctx->domain) {
DEBUG(SSSDBG_OP_FAILURE,
"No matching domain found for [%s], fail!\n", cmd_ctx->name);
return ssh_user_handle_not_found(cmd_ctx->name);
}
talloc_zfree(cmd_ctx->fqdn);
cmd_ctx->fqdn = sss_resp_create_fqname(cmd_ctx, cmd_ctx->cctx->rctx,
cmd_ctx->domain, false, cmd_ctx->name);
if (cmd_ctx->fqdn == NULL) {
return ENOMEM;
}
/* refresh the user's cache entry */
if (NEED_CHECK_PROVIDER(cmd_ctx->domain->provider)) {
req = sss_dp_get_account_send(cmd_ctx, cmd_ctx->cctx->rctx,
cmd_ctx->domain, false, SSS_DP_USER,
cmd_ctx->fqdn, 0, NULL);
if (!req) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Out of memory sending data provider request\n");
return ENOMEM;
}
cb_ctx = talloc_zero(cmd_ctx, struct dp_callback_ctx);
if (!cb_ctx) {
talloc_zfree(req);
return ENOMEM;
}
cb_ctx->callback = ssh_user_pubkeys_search_dp_callback;
cb_ctx->ptr = cmd_ctx;
cb_ctx->cctx = cmd_ctx->cctx;
cb_ctx->mem_ctx = cmd_ctx;
tevent_req_set_callback(req, ssh_dp_send_req_done, cb_ctx);
/* tell caller we are in an async call */
return EAGAIN;
}
static int pam_check_user_search(struct pam_auth_req *preq)
{
struct sss_domain_info *dom = preq->domain;
char *name = NULL;
time_t cacheExpire;
int ret;
struct tevent_req *dpreq;
struct dp_callback_ctx *cb_ctx;
struct pam_ctx *pctx =
talloc_get_type(preq->cctx->rctx->pvt_ctx, struct pam_ctx);
while (dom) {
/* if it is a domainless search, skip domains that require fully
* qualified names instead */
while (dom && !preq->pd->domain && dom->fqnames) {
dom = get_next_domain(dom, false);
}
if (!dom) break;
if (dom != preq->domain) {
/* make sure we reset the check_provider flag when we check
* a new domain */
preq->check_provider = NEED_CHECK_PROVIDER(dom->provider);
}
/* make sure to update the preq if we changed domain */
preq->domain = dom;
talloc_free(name);
name = sss_get_cased_name(preq, preq->pd->user,
dom->case_sensitive);
if (!name) {
return ENOMEM;
}
name = sss_reverse_replace_space(preq, name,
pctx->rctx->override_space);
if (name == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
"sss_reverse_replace_space failed\n");
return ENOMEM;
}
/* Refresh the user's cache entry on any PAM query
* We put a timeout in the client context so that we limit
* the number of updates within a reasonable timeout
*/
if (preq->check_provider) {
ret = pam_initgr_check_timeout(pctx->id_table, name);
if (ret != EOK
&& ret != ENOENT) {
DEBUG(SSSDBG_OP_FAILURE,
"Could not look up initgroup timout\n");
return EIO;
} else if (ret == ENOENT) {
/* Call provider first */
break;
}
/* Entry is still valid, get it from the sysdb */
}
DEBUG(SSSDBG_CONF_SETTINGS,
"Requesting info for [%s@%s]\n", name, dom->name);
if (dom->sysdb == NULL) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Fatal: Sysdb CTX not found for this domain!\n");
preq->pd->pam_status = PAM_SYSTEM_ERR;
return EFAULT;
}
ret = sysdb_getpwnam(preq, dom, name, &preq->res);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to make request to our cache!\n");
return EIO;
}
if (preq->res->count > 1) {
DEBUG(SSSDBG_FATAL_FAILURE,
"getpwnam call returned more than one result !?!\n");
return ENOENT;
}
if (preq->res->count == 0) {
if (preq->check_provider == false) {
/* set negative cache only if not result of cache check */
ret = sss_ncache_set_user(pctx->ncache, false, dom, name);
if (ret != EOK) {
/* Should not be fatal, just slower next time */
DEBUG(SSSDBG_MINOR_FAILURE,
"Cannot set ncache for [%s@%s]\n", name,
dom->name);
}
}
/* if a multidomain search, try with next */
if (!preq->pd->domain) {
dom = get_next_domain(dom, false);
continue;
}
DEBUG(SSSDBG_OP_FAILURE, "No results for getpwnam call\n");
/* TODO: store negative cache ? */
return ENOENT;
}
/* One result found */
/* if we need to check the remote account go on */
if (preq->check_provider) {
cacheExpire = ldb_msg_find_attr_as_uint64(preq->res->msgs[0],
SYSDB_CACHE_EXPIRE, 0);
if (cacheExpire < time(NULL)) {
break;
}
}
DEBUG(SSSDBG_TRACE_FUNC,
"Returning info for user [%s@%s]\n", name, dom->name);
/* We might have searched by alias. Pass on the primary name */
ret = pd_set_primary_name(preq->res->msgs[0], preq->pd);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Could not canonicalize username\n");
return ret;
}
return EOK;
}
if (!dom) {
/* Ensure that we don't try to check a provider without a domain,
* since this will cause a NULL-dereference below.
*/
preq->check_provider = false;
}
if (preq->check_provider) {
/* dont loop forever :-) */
preq->check_provider = false;
dpreq = sss_dp_get_account_send(preq, preq->cctx->rctx,
dom, false, SSS_DP_INITGROUPS,
name, 0, NULL);
if (!dpreq) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Out of memory sending data provider request\n");
return ENOMEM;
}
cb_ctx = talloc_zero(preq, struct dp_callback_ctx);
if(!cb_ctx) {
talloc_zfree(dpreq);
return ENOMEM;
}
cb_ctx->callback = pam_check_user_dp_callback;
cb_ctx->ptr = preq;
cb_ctx->cctx = preq->cctx;
cb_ctx->mem_ctx = preq;
tevent_req_set_callback(dpreq, pam_dp_send_acct_req_done, cb_ctx);
/* tell caller we are in an async call */
return EAGAIN;
}
static int pam_forwarder(struct cli_ctx *cctx, int pam_cmd)
{
struct sss_domain_info *dom;
struct pam_auth_req *preq;
struct pam_data *pd;
int ret;
errno_t ncret;
struct pam_ctx *pctx =
talloc_get_type(cctx->rctx->pvt_ctx, struct pam_ctx);
struct tevent_req *req;
preq = talloc_zero(cctx, struct pam_auth_req);
if (!preq) {
return ENOMEM;
}
talloc_set_destructor(preq, pam_auth_req_destructor);
preq->cctx = cctx;
preq->pd = create_pam_data(preq);
if (!preq->pd) {
talloc_free(preq);
return ENOMEM;
}
pd = preq->pd;
pd->cmd = pam_cmd;
pd->priv = cctx->priv;
ret = pam_forwarder_parse_data(cctx, pd);
if (ret == EAGAIN) {
req = sss_dp_get_domains_send(cctx->rctx, cctx->rctx, true, pd->domain);
if (req == NULL) {
ret = ENOMEM;
} else {
tevent_req_set_callback(req, pam_forwarder_cb, preq);
ret = EAGAIN;
}
goto done;
} else if (ret != EOK) {
ret = EINVAL;
goto done;
}
/* now check user is valid */
if (pd->domain) {
preq->domain = responder_get_domain(cctx->rctx, pd->domain);
if (!preq->domain) {
ret = ENOENT;
goto done;
}
ncret = sss_ncache_check_user(pctx->ncache, pctx->neg_timeout,
preq->domain, pd->user);
if (ncret == EEXIST) {
/* User found in the negative cache */
ret = ENOENT;
goto done;
}
} else {
for (dom = preq->cctx->rctx->domains;
dom;
dom = get_next_domain(dom, false)) {
if (dom->fqnames) continue;
ncret = sss_ncache_check_user(pctx->ncache, pctx->neg_timeout,
dom, pd->user);
if (ncret == ENOENT) {
/* User not found in the negative cache
* Proceed with PAM actions
*/
break;
}
/* Try the next domain */
DEBUG(SSSDBG_TRACE_FUNC,
"User [%s@%s] filtered out (negative cache). "
"Trying next domain.\n", pd->user, dom->name);
}
if (!dom) {
ret = ENOENT;
goto done;
}
preq->domain = dom;
}
if (preq->domain->provider == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Domain [%s] has no auth provider.\n", preq->domain->name);
ret = EINVAL;
goto done;
}
preq->check_provider = NEED_CHECK_PROVIDER(preq->domain->provider);
ret = pam_check_user_search(preq);
if (ret == EOK) {
pam_dom_forwarder(preq);
}
done:
return pam_check_user_done(preq, ret);
}
static void pam_reply(struct pam_auth_req *preq)
{
struct cli_ctx *cctx;
uint8_t *body;
size_t blen;
int ret;
int32_t resp_c;
int32_t resp_size;
struct response_data *resp;
int p;
struct timeval tv;
struct tevent_timer *te;
struct pam_data *pd;
struct pam_ctx *pctx;
uint32_t user_info_type;
time_t exp_date = -1;
time_t delay_until = -1;
pd = preq->pd;
cctx = preq->cctx;
pctx = talloc_get_type(preq->cctx->rctx->pvt_ctx, struct pam_ctx);
DEBUG(SSSDBG_FUNC_DATA,
"pam_reply called with result [%d].\n", pd->pam_status);
if (pd->pam_status == PAM_AUTHINFO_UNAVAIL) {
switch(pd->cmd) {
case SSS_PAM_AUTHENTICATE:
if ((preq->domain != NULL) &&
(preq->domain->cache_credentials == true) &&
(pd->offline_auth == false)) {
const char *password = NULL;
/* do auth with offline credentials */
pd->offline_auth = true;
if (preq->domain->sysdb == NULL) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Fatal: Sysdb CTX not found for domain"
" [%s]!\n", preq->domain->name);
goto done;
}
ret = sss_authtok_get_password(pd->authtok, &password, NULL);
if (ret) {
DEBUG(SSSDBG_FATAL_FAILURE, "Failed to get password.\n");
goto done;
}
ret = sysdb_cache_auth(preq->domain,
pd->user, password,
pctx->rctx->cdb, false,
&exp_date, &delay_until);
pam_handle_cached_login(preq, ret, exp_date, delay_until);
return;
}
break;
case SSS_PAM_CHAUTHTOK_PRELIM:
case SSS_PAM_CHAUTHTOK:
DEBUG(SSSDBG_FUNC_DATA,
"Password change not possible while offline.\n");
pd->pam_status = PAM_AUTHTOK_ERR;
user_info_type = SSS_PAM_USER_INFO_OFFLINE_CHPASS;
ret = pam_add_response(pd, SSS_PAM_USER_INFO, sizeof(uint32_t),
(const uint8_t *) &user_info_type);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "pam_add_response failed.\n");
goto done;
}
break;
/* TODO: we need the pam session cookie here to make sure that cached
* authentication was successful */
case SSS_PAM_SETCRED:
case SSS_PAM_ACCT_MGMT:
case SSS_PAM_OPEN_SESSION:
case SSS_PAM_CLOSE_SESSION:
DEBUG(SSSDBG_OP_FAILURE,
"Assuming offline authentication setting status for "
"pam call %d to PAM_SUCCESS.\n", pd->cmd);
pd->pam_status = PAM_SUCCESS;
break;
default:
DEBUG(SSSDBG_CRIT_FAILURE, "Unknown PAM call [%d].\n", pd->cmd);
pd->pam_status = PAM_MODULE_UNKNOWN;
}
}
if (pd->response_delay > 0) {
ret = gettimeofday(&tv, NULL);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "gettimeofday failed [%d][%s].\n",
errno, strerror(errno));
goto done;
}
tv.tv_sec += pd->response_delay;
tv.tv_usec = 0;
pd->response_delay = 0;
te = tevent_add_timer(cctx->ev, cctx, tv, pam_reply_delay, preq);
if (te == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to add event pam_reply_delay.\n");
goto done;
}
return;
}
/* If this was a successful login, save the lastLogin time */
if (pd->cmd == SSS_PAM_AUTHENTICATE &&
pd->pam_status == PAM_SUCCESS &&
preq->domain->cache_credentials &&
!pd->offline_auth &&
!pd->last_auth_saved &&
NEED_CHECK_PROVIDER(preq->domain->provider)) {
ret = set_last_login(preq);
if (ret != EOK) {
goto done;
}
return;
}
ret = sss_packet_new(cctx->creq, 0, sss_packet_get_cmd(cctx->creq->in),
&cctx->creq->out);
if (ret != EOK) {
goto done;
}
ret = filter_responses(pctx->rctx->cdb, pd->resp_list);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "filter_responses failed, not fatal.\n");
}
if (pd->domain != NULL) {
ret = pam_add_response(pd, SSS_PAM_DOMAIN_NAME, strlen(pd->domain)+1,
(uint8_t *) pd->domain);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "pam_add_response failed.\n");
goto done;
}
}
resp_c = 0;
resp_size = 0;
resp = pd->resp_list;
while(resp != NULL) {
if (!resp->do_not_send_to_client) {
resp_c++;
resp_size += resp->len;
}
resp = resp->next;
}
ret = sss_packet_grow(cctx->creq->out, sizeof(int32_t) +
sizeof(int32_t) +
resp_c * 2* sizeof(int32_t) +
resp_size);
if (ret != EOK) {
goto done;
}
sss_packet_get_body(cctx->creq->out, &body, &blen);
DEBUG(SSSDBG_FUNC_DATA, "blen: %zu\n", blen);
p = 0;
memcpy(&body[p], &pd->pam_status, sizeof(int32_t));
p += sizeof(int32_t);
memcpy(&body[p], &resp_c, sizeof(int32_t));
p += sizeof(int32_t);
resp = pd->resp_list;
while(resp != NULL) {
if (!resp->do_not_send_to_client) {
memcpy(&body[p], &resp->type, sizeof(int32_t));
p += sizeof(int32_t);
memcpy(&body[p], &resp->len, sizeof(int32_t));
p += sizeof(int32_t);
memcpy(&body[p], resp->data, resp->len);
p += resp->len;
}
resp = resp->next;
}
done:
sss_cmd_done(cctx, preq);
}
