pamsrv_cmd.c revision 3bea01f01d76e1e95a8239c0d3f67073992136a1
/*
SSSD
PAM Responder
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 <time.h>
#include "util/util.h"
#include "util/sss_selinux.h"
#include "db/sysdb.h"
#include "confdb/confdb.h"
#include "responder/common/responder_packet.h"
#include "responder/common/responder.h"
#include "responder/common/negcache.h"
#include "providers/data_provider.h"
#include "responder/pam/pamsrv.h"
#include "responder/pam/pam_helpers.h"
#include "db/sysdb.h"
#include "db/sysdb_selinux.h"
enum pam_verbosity {
PAM_VERBOSITY_NO_MESSAGES = 0,
PAM_VERBOSITY_IMPORTANT,
PAM_VERBOSITY_INFO,
PAM_VERBOSITY_DEBUG
};
#define DEFAULT_PAM_VERBOSITY PAM_VERBOSITY_IMPORTANT
#define DEFAULT_PAM_PWD_EXPIRATION_WARNING 7
static void pam_reply(struct pam_auth_req *preq);
static int extract_authtok(uint32_t *type, uint32_t *size, uint8_t **tok,
size_t data_size, uint8_t *body, size_t blen,
size_t *c) {
if (data_size < sizeof(uint32_t) || *c+data_size > blen ||
SIZE_T_OVERFLOW(*c, data_size)) return EINVAL;
*size = data_size - sizeof(uint32_t);
SAFEALIGN_COPY_UINT32_CHECK(type, &body[*c], blen, c);
*tok = body+(*c);
*c += (*size);
return EOK;
}
static int extract_string(char **var, size_t size, uint8_t *body, size_t blen,
size_t *c) {
uint8_t *str;
if (*c+size > blen || SIZE_T_OVERFLOW(*c, size)) return EINVAL;
str = body+(*c);
if (str[size-1]!='\0') return EINVAL;
/* If the string isn't valid UTF-8, fail */
if (!sss_utf8_check(str, size-1)) {
return EINVAL;
}
*c += size;
*var = (char *) str;
return EOK;
}
static int extract_uint32_t(uint32_t *var, size_t size, uint8_t *body,
size_t blen, size_t *c) {
if (size != sizeof(uint32_t) || *c+size > blen || SIZE_T_OVERFLOW(*c, size))
return EINVAL;
SAFEALIGN_COPY_UINT32_CHECK(var, &body[*c], blen, c);
return EOK;
}
static int pd_set_primary_name(const struct ldb_message *msg,struct pam_data *pd)
{
const char *name;
name = ldb_msg_find_attr_as_string(msg, SYSDB_NAME, NULL);
if (!name) {
DEBUG(SSSDBG_CRIT_FAILURE, ("A user with no name?\n"));
return EIO;
}
if (strcmp(pd->user, name)) {
DEBUG(SSSDBG_TRACE_FUNC, ("User's primary name is %s\n", name));
talloc_free(pd->user);
pd->user = talloc_strdup(pd, name);
if (!pd->user) return ENOMEM;
}
return EOK;
}
static int pam_parse_in_data_v2(struct sss_names_ctx *snctx,
struct pam_data *pd,
uint8_t *body, size_t blen)
{
size_t c;
uint32_t type;
uint32_t size;
char *pam_user;
int ret;
uint32_t terminator = SSS_END_OF_PAM_REQUEST;
if (blen < 4*sizeof(uint32_t)+2 ||
((uint32_t *)body)[0] != SSS_START_OF_PAM_REQUEST ||
memcmp(&body[blen - sizeof(uint32_t)], &terminator, sizeof(uint32_t)) != 0) {
DEBUG(1, ("Received data is invalid.\n"));
return EINVAL;
}
c = sizeof(uint32_t);
do {
SAFEALIGN_COPY_UINT32_CHECK(&type, &body[c], blen, &c);
if (type == SSS_END_OF_PAM_REQUEST) {
if (c != blen) return EINVAL;
} else {
SAFEALIGN_COPY_UINT32_CHECK(&size, &body[c], blen, &c);
/* the uint32_t end maker SSS_END_OF_PAM_REQUEST does not count to
* the remaining buffer */
if (size > (blen - c - sizeof(uint32_t))) {
DEBUG(1, ("Invalid data size.\n"));
return EINVAL;
}
switch(type) {
case SSS_PAM_ITEM_USER:
ret = extract_string(&pam_user, size, body, blen, &c);
if (ret != EOK) return ret;
ret = sss_parse_name(pd, snctx, pam_user,
&pd->domain, &pd->user);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_SERVICE:
ret = extract_string(&pd->service, size, body, blen, &c);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_TTY:
ret = extract_string(&pd->tty, size, body, blen, &c);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_RUSER:
ret = extract_string(&pd->ruser, size, body, blen, &c);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_RHOST:
ret = extract_string(&pd->rhost, size, body, blen, &c);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_CLI_PID:
ret = extract_uint32_t(&pd->cli_pid, size,
body, blen, &c);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_AUTHTOK:
ret = extract_authtok(&pd->authtok_type, &pd->authtok_size,
&pd->authtok, size, body, blen, &c);
if (ret != EOK) return ret;
break;
case SSS_PAM_ITEM_NEWAUTHTOK:
ret = extract_authtok(&pd->newauthtok_type,
&pd->newauthtok_size,
&pd->newauthtok, size, body, blen, &c);
if (ret != EOK) return ret;
break;
default:
DEBUG(1,("Ignoring unknown data type [%d].\n", type));
c += size;
}
}
} while(c < blen);
if (pd->user == NULL || *pd->user == '\0') return EINVAL;
DEBUG_PAM_DATA(4, pd);
return EOK;
}
static int pam_parse_in_data_v3(struct sss_names_ctx *snctx,
struct pam_data *pd,
uint8_t *body, size_t blen)
{
int ret;
ret = pam_parse_in_data_v2(snctx, pd, body, blen);
if (ret != EOK) {
DEBUG(1, ("pam_parse_in_data_v2 failed.\n"));
return ret;
}
if (pd->cli_pid == 0) {
DEBUG(1, ("Missing client PID.\n"));
return EINVAL;
}
return EOK;
}
static int pam_parse_in_data(struct sss_names_ctx *snctx,
struct pam_data *pd,
uint8_t *body, size_t blen)
{
int start;
int end;
int last;
int ret;
last = blen - 1;
end = 0;
/* user name */
for (start = end; end < last; end++) if (body[end] == '\0') break;
if (body[end++] != '\0') return EINVAL;
ret = sss_parse_name(pd, snctx, (char *)&body[start], &pd->domain, &pd->user);
if (ret != EOK) return ret;
for (start = end; end < last; end++) if (body[end] == '\0') break;
if (body[end++] != '\0') return EINVAL;
pd->service = (char *) &body[start];
for (start = end; end < last; end++) if (body[end] == '\0') break;
if (body[end++] != '\0') return EINVAL;
pd->tty = (char *) &body[start];
for (start = end; end < last; end++) if (body[end] == '\0') break;
if (body[end++] != '\0') return EINVAL;
pd->ruser = (char *) &body[start];
for (start = end; end < last; end++) if (body[end] == '\0') break;
if (body[end++] != '\0') return EINVAL;
pd->rhost = (char *) &body[start];
start = end;
pd->authtok_type = (int) body[start];
start += sizeof(uint32_t);
pd->authtok_size = (int) body[start];
if (pd->authtok_size >= blen) return EINVAL;
start += sizeof(uint32_t);
end = start + pd->authtok_size;
if (pd->authtok_size == 0) {
pd->authtok = NULL;
} else {
if (end <= blen) {
pd->authtok = (uint8_t *) &body[start];
} else {
DEBUG(1, ("Invalid authtok size: %d\n", pd->authtok_size));
return EINVAL;
}
}
start = end;
pd->newauthtok_type = (int) body[start];
start += sizeof(uint32_t);
pd->newauthtok_size = (int) body[start];
if (pd->newauthtok_size >= blen) return EINVAL;
start += sizeof(uint32_t);
end = start + pd->newauthtok_size;
if (pd->newauthtok_size == 0) {
pd->newauthtok = NULL;
} else {
if (end <= blen) {
pd->newauthtok = (uint8_t *) &body[start];
} else {
DEBUG(1, ("Invalid newauthtok size: %d\n", pd->newauthtok_size));
return EINVAL;
}
}
DEBUG_PAM_DATA(4, pd);
return EOK;
}
/*=Save-Last-Login-State===================================================*/
static errno_t set_last_login(struct pam_auth_req *preq)
{
struct sysdb_ctx *dbctx;
struct sysdb_attrs *attrs;
errno_t ret;
attrs = sysdb_new_attrs(preq);
if (!attrs) {
ret = ENOMEM;
goto fail;
}
ret = sysdb_attrs_add_time_t(attrs, SYSDB_LAST_ONLINE_AUTH, time(NULL));
if (ret != EOK) {
goto fail;
}
ret = sysdb_attrs_add_time_t(attrs, SYSDB_LAST_LOGIN, time(NULL));
if (ret != EOK) {
goto fail;
}
ret = sysdb_get_ctx_from_list(preq->cctx->rctx->db_list, preq->domain,
&dbctx);
if (ret != EOK) {
DEBUG(0, ("Fatal: Sysdb context not found for this domain!\n"));
goto fail;
}
ret = sysdb_set_user_attr(dbctx, preq->pd->user, attrs, SYSDB_MOD_REP);
if (ret != EOK) {
DEBUG(2, ("set_last_login failed.\n"));
preq->pd->pam_status = PAM_SYSTEM_ERR;
goto fail;
} else {
preq->pd->last_auth_saved = true;
}
preq->callback(preq);
return EOK;
fail:
return ret;
}
static errno_t get_selinux_string(struct pam_auth_req *preq)
{
struct sysdb_ctx *sysdb;
TALLOC_CTX *tmp_ctx;
struct pam_data *pd = preq->pd;
char *file_content = NULL;
struct ldb_message **usermaps;
struct ldb_message *config;
const char *default_user = NULL;
const char *tmp_str;
char *order = NULL;
char **order_array;
errno_t ret;
int i, j;
size_t order_count;
size_t len;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
ret = ENOMEM;
goto done;
}
ret = sysdb_get_ctx_from_list(preq->cctx->rctx->db_list,
preq->domain, &sysdb);
if (ret != EOK) {
goto done;
}
ret = sysdb_search_selinux_config(tmp_ctx, sysdb, NULL, &config);
if (ret == ENOENT) {
DEBUG(SSSDBG_TRACE_INTERNAL, ("No SELinux support found for the domain\n"));
ret = EOK;
goto done;
} else if (ret != EOK) {
goto done;
}
/* We need two values from the config object:
* - default SELinux user in case no other is available
* - the order for fetched usermaps
*/
for (i = 0; i < config->num_elements; i++) {
if (strcasecmp(config->elements[i].name, SYSDB_SELINUX_DEFAULT_USER) == 0) {
default_user = (const char *)config->elements[i].values[0].data;
} else if (strcasecmp(config->elements[i].name, SYSDB_SELINUX_DEFAULT_ORDER) == 0) {
tmp_str = (char *)config->elements[i].values[0].data;
len = config->elements[i].values[0].length;
order = talloc_strdup(tmp_ctx, tmp_str);
if (order == NULL) {
goto done;
}
}
}
if (default_user == NULL || order == NULL) {
DEBUG(SSSDBG_OP_FAILURE, ("No default SELinux user "
"or map order given!\n"));
ret = EINVAL;
goto done;
}
/* The "order" string contains one or more SELinux user records
* separated by $. Now we need to create an array of string from
* this one string. First find out how many elements in the array
* will be. This way only one alloc will be necessary for the array
*/
order_count = 1;
for (i = 0; i < len; i++) {
if (order[i] == '$') order_count++;
}
order_array = talloc_array(tmp_ctx, char *, order_count);
if (order_array == NULL) {
ret = ENOMEM;
goto done;
}
/* Now fill the array with pointers to the original string. Also
* use binary zeros to make multiple string out of the one.
*/
order_array[0] = order;
order_count = 1;
for (i = 0; i < len; i++) {
if (order[i] == '$') {
order[i] = '\0';
order_array[order_count] = &order[i+1];
order_count++;
}
}
/* Fetch all maps applicable to the user who is currently logging in */
ret = sysdb_search_selinux_usermap_by_username(tmp_ctx, sysdb, pd->user,
&usermaps);
if (ret != EOK && ret != ENOENT) {
goto done;
}
if (ret == ENOENT) {
DEBUG(SSSDBG_TRACE_FUNC, ("No user maps found, using default!"));
file_content = talloc_strdup(tmp_ctx, default_user);
if (file_content == NULL) {
ret = ENOMEM;
goto done;
}
} else {
file_content = talloc_strdup(tmp_ctx, "");
if (file_content == NULL) {
ret = ENOMEM;
goto done;
}
/* Iterate through the order array and try to find SELinux users
* in fetched maps. The order array contains all SELinux users
* allowed in the domain in the same order they should appear
* in the SELinux config file. If any user from the order array
* is not in fetched user maps, it means it should not be allowed
* for the user who is just logging in.
*
* Right now we have empty content of the SELinux config file,
* we shall add only those SELinux users that are present both in
* the order array and user maps applicable to the user who is
* logging in.
*/
for (i = 0; i < order_count; i++) {
for (j = 0; usermaps[j] != NULL; j++) {
tmp_str = sss_selinux_map_get_seuser(usermaps[j]);
if (tmp_str && !strcasecmp(tmp_str, order_array[i])) {
file_content = talloc_asprintf_append(file_content, "%s\n",
tmp_str);
if (file_content == NULL) {
ret = ENOMEM;
goto done;
}
break;
}
}
}
}
len = strlen(file_content);
if (len > 0) {
ret = pam_add_response(pd, SSS_PAM_SELINUX_MAP, len,
(uint8_t *)file_content);
}
done:
talloc_free(tmp_ctx);
return ret;
}
static errno_t filter_responses(struct confdb_ctx *cdb,
struct response_data *resp_list)
{
int ret;
struct response_data *resp;
uint32_t user_info_type;
int64_t expire_date;
uint32_t expire_warn;
TALLOC_CTX *tmp_ctx;
int pam_verbosity;
int pam_expiration_warning;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(1, ("talloc_new failed.\n"));
return ENOMEM;
}
ret = confdb_get_int(cdb, CONFDB_PAM_CONF_ENTRY,
CONFDB_PAM_VERBOSITY, DEFAULT_PAM_VERBOSITY,
&pam_verbosity);
if (ret != EOK) {
DEBUG(1, ("Failed to read PAM verbosity, not fatal.\n"));
pam_verbosity = DEFAULT_PAM_VERBOSITY;
}
ret = confdb_get_int(cdb, CONFDB_PAM_CONF_ENTRY,
CONFDB_PAM_PWD_EXPIRATION_WARNING,
DEFAULT_PAM_PWD_EXPIRATION_WARNING,
&pam_expiration_warning);
if (ret != EOK) {
DEBUG(1, ("Failed to read PAM expiration warning, not fatal.\n"));
pam_expiration_warning = DEFAULT_PAM_PWD_EXPIRATION_WARNING;
}
talloc_free(tmp_ctx);
resp = resp_list;
while(resp != NULL) {
if (resp->type == SSS_PAM_USER_INFO) {
if (resp->len < sizeof(uint32_t)) {
DEBUG(1, ("User info entry is too short.\n"));
return EINVAL;
}
if (pam_verbosity == PAM_VERBOSITY_NO_MESSAGES) {
resp->do_not_send_to_client = true;
resp = resp->next;
continue;
}
memcpy(&user_info_type, resp->data, sizeof(uint32_t));
resp->do_not_send_to_client = false;
switch (user_info_type) {
case SSS_PAM_USER_INFO_OFFLINE_AUTH:
if (resp->len != sizeof(uint32_t) + sizeof(int64_t)) {
DEBUG(1, ("User info offline auth entry is "
"too short.\n"));
return EINVAL;
}
memcpy(&expire_date, resp->data + sizeof(uint32_t),
sizeof(int64_t));
if ((expire_date == 0 &&
pam_verbosity < PAM_VERBOSITY_INFO) ||
(expire_date > 0 &&
pam_verbosity < PAM_VERBOSITY_IMPORTANT)) {
resp->do_not_send_to_client = true;
}
break;
case SSS_PAM_USER_INFO_EXPIRE_WARN:
if (resp->len != 2 * sizeof(uint32_t)) {
DEBUG(1, ("User info expire warning entry is "
"too short.\n"));
return EINVAL;
}
memcpy(&expire_warn, resp->data + sizeof(uint32_t),
sizeof(uint32_t));
if(expire_warn > pam_expiration_warning * (60 * 60 * 24)) {
resp->do_not_send_to_client = true;
}
break;
default:
DEBUG(7, ("User info type [%d] not filtered.\n"));
}
} else if (resp->type & SSS_SERVER_INFO) {
resp->do_not_send_to_client = true;
}
resp = resp->next;
}
return EOK;
}
static void pam_reply_delay(struct tevent_context *ev, struct tevent_timer *te,
struct timeval tv, void *pvt)
{
struct pam_auth_req *preq;
DEBUG(4, ("pam_reply_delay get called.\n"));
preq = talloc_get_type(pvt, struct pam_auth_req);
pam_reply(preq);
}
static void pam_cache_auth_done(struct pam_auth_req *preq, int ret,
time_t expire_date, time_t delayed_until);
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 sysdb_ctx *sysdb;
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(4, ("pam_reply get called.\n"));
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)) {
/* do auth with offline credentials */
pd->offline_auth = true;
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 "
"domain [%s]!\n", preq->domain->name));
goto done;
}
ret = sysdb_cache_auth(sysdb, pd->user,
pd->authtok, pd->authtok_size,
pctx->rctx->cdb, false,
&exp_date, &delay_until);
pam_cache_auth_done(preq, ret, exp_date, delay_until);
return;
}
break;
case SSS_PAM_CHAUTHTOK_PRELIM:
case SSS_PAM_CHAUTHTOK:
DEBUG(5, ("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(1, ("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(2, ("Assuming offline authentication setting status for "
"pam call %d to PAM_SUCCESS.\n", pd->cmd));
pd->pam_status = PAM_SUCCESS;
break;
default:
DEBUG(1, ("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(1, ("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(1, ("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;
}
if (pd->cmd == SSS_PAM_OPEN_SESSION &&
pd->pam_status == PAM_SUCCESS) {
/* Try to fetch data from sysdb
* (auth already passed -> we should have them) */
ret = get_selinux_string(preq);
if (ret != EOK) {
pd->pam_status = PAM_SYSTEM_ERR;
}
}
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(1, ("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(1, ("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(4, ("blen: %d\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);
}
static void pam_cache_auth_done(struct pam_auth_req *preq, int ret,
time_t expire_date, time_t delayed_until)
{
uint32_t resp_type;
size_t resp_len;
uint8_t *resp;
int64_t dummy;
switch (ret) {
case EOK:
preq->pd->pam_status = PAM_SUCCESS;
resp_type = SSS_PAM_USER_INFO_OFFLINE_AUTH;
resp_len = sizeof(uint32_t) + sizeof(int64_t);
resp = talloc_size(preq->pd, resp_len);
if (resp == NULL) {
DEBUG(1, ("talloc_size failed, cannot prepare user info.\n"));
} else {
memcpy(resp, &resp_type, sizeof(uint32_t));
dummy = (int64_t) expire_date;
memcpy(resp+sizeof(uint32_t), &dummy, sizeof(int64_t));
ret = pam_add_response(preq->pd, SSS_PAM_USER_INFO, resp_len,
(const uint8_t *) resp);
if (ret != EOK) {
DEBUG(1, ("pam_add_response failed.\n"));
}
}
break;
case ENOENT:
preq->pd->pam_status = PAM_AUTHINFO_UNAVAIL;
break;
case EINVAL:
preq->pd->pam_status = PAM_AUTH_ERR;
break;
case EACCES:
preq->pd->pam_status = PAM_PERM_DENIED;
if (delayed_until >= 0) {
resp_type = SSS_PAM_USER_INFO_OFFLINE_AUTH_DELAYED;
resp_len = sizeof(uint32_t) + sizeof(int64_t);
resp = talloc_size(preq->pd, resp_len);
if (resp == NULL) {
DEBUG(1, ("talloc_size failed, cannot prepare user info.\n"));
} else {
memcpy(resp, &resp_type, sizeof(uint32_t));
dummy = (int64_t) delayed_until;
memcpy(resp+sizeof(uint32_t), &dummy, sizeof(int64_t));
ret = pam_add_response(preq->pd, SSS_PAM_USER_INFO, resp_len,
(const uint8_t *) resp);
if (ret != EOK) {
DEBUG(1, ("pam_add_response failed.\n"));
}
}
}
break;
default:
preq->pd->pam_status = PAM_SYSTEM_ERR;
}
pam_reply(preq);
return;
}
static void pam_check_user_dp_callback(uint16_t err_maj, uint32_t err_min,
const char *err_msg, void *ptr);
static int pam_check_user_search(struct pam_auth_req *preq);
static int pam_check_user_done(struct pam_auth_req *preq, int ret);
static void pam_dom_forwarder(struct pam_auth_req *preq);
/* TODO: we should probably return some sort of cookie that is set in the
* PAM_ENVIRONMENT, so that we can save performing some calls and cache
* data. */
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;
uint8_t *body;
size_t blen;
int ret;
errno_t ncret;
struct pam_ctx *pctx =
talloc_get_type(cctx->rctx->pvt_ctx, struct pam_ctx);
uint32_t terminator = SSS_END_OF_PAM_REQUEST;
preq = talloc_zero(cctx, struct pam_auth_req);
if (!preq) {
return ENOMEM;
}
preq->cctx = cctx;
preq->pd = talloc_zero(preq, struct pam_data);
if (!preq->pd) {
talloc_free(preq);
return ENOMEM;
}
pd = preq->pd;
sss_packet_get_body(cctx->creq->in, &body, &blen);
if (blen >= sizeof(uint32_t) &&
memcmp(&body[blen - sizeof(uint32_t)], &terminator, sizeof(uint32_t)) != 0) {
DEBUG(1, ("Received data not terminated.\n"));
ret = EINVAL;
goto done;
}
pd->cmd = pam_cmd;
pd->priv = cctx->priv;
switch (cctx->cli_protocol_version->version) {
case 1:
ret = pam_parse_in_data(cctx->rctx->names, pd, body, blen);
break;
case 2:
ret = pam_parse_in_data_v2(cctx->rctx->names, pd, body, blen);
break;
case 3:
ret = pam_parse_in_data_v3(cctx->rctx->names, pd, body, blen);
break;
default:
DEBUG(1, ("Illegal protocol version [%d].\n",
cctx->cli_protocol_version->version));
ret = EINVAL;
}
if (ret != EOK) {
ret = EINVAL;
goto done;
}
/* now check user is valid */
if (pd->domain) {
preq->domain = responder_get_domain(cctx->rctx->domains, pd->domain);
if (!preq->domain) {
ret = ENOENT;
goto done;
}
}
else {
for (dom = preq->cctx->rctx->domains; dom; dom = dom->next) {
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(4, ("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(1, ("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_dp_send_acct_req_done(struct tevent_req *req);
static int pam_check_user_search(struct pam_auth_req *preq)
{
struct sss_domain_info *dom = preq->domain;
struct cli_ctx *cctx = preq->cctx;
char *name = NULL;
struct sysdb_ctx *sysdb;
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 = dom->next;
}
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;
}
/* 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(4, ("Requesting info for [%s@%s]\n", name, dom->name));
ret = sysdb_get_ctx_from_list(cctx->rctx->db_list, dom, &sysdb);
if (ret != EOK) {
DEBUG(0, ("Fatal: Sysdb CTX not found for this domain!\n"));
preq->pd->pam_status = PAM_SYSTEM_ERR;
return EFAULT;
}
ret = sysdb_getpwnam(preq, sysdb, name, &preq->res);
if (ret != EOK) {
DEBUG(1, ("Failed to make request to our cache!\n"));
return EIO;
}
if (preq->res->count > 1) {
DEBUG(0, ("getpwnam call returned more than one result !?!\n"));
return ENOENT;
}
if (preq->res->count == 0) {
/* if a multidomain search, try with next */
if (!preq->pd->domain) {
dom = dom->next;
continue;
}
DEBUG(2, ("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(6, ("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;
}
DEBUG(2, ("No matching domain found for [%s], fail!\n", name));
return ENOENT;
}
static void pam_dp_send_acct_req_done(struct tevent_req *req)
{
struct dp_callback_ctx *cb_ctx =
tevent_req_callback_data(req, struct dp_callback_ctx);
errno_t ret;
dbus_uint16_t err_maj;
dbus_uint32_t err_min;
char *err_msg;
ret = sss_dp_get_account_recv(cb_ctx->mem_ctx, req,
&err_maj, &err_min,
&err_msg);
talloc_zfree(req);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
("Fatal error, killing connection!\n"));
talloc_free(cb_ctx->cctx);
return;
}
cb_ctx->callback(err_maj, err_min, err_msg, cb_ctx->ptr);
}
static int pam_check_user_done(struct pam_auth_req *preq, int ret)
{
switch (ret) {
case EOK:
break;
case EAGAIN:
/* performing async request, just return */
break;
case ENOENT:
preq->pd->pam_status = PAM_USER_UNKNOWN;
pam_reply(preq);
break;
default:
preq->pd->pam_status = PAM_SYSTEM_ERR;
pam_reply(preq);
break;
}
return EOK;
}
static void pam_check_user_dp_callback(uint16_t err_maj, uint32_t err_min,
const char *err_msg, void *ptr)
{
struct pam_auth_req *preq = talloc_get_type(ptr, struct pam_auth_req);
int ret;
struct pam_ctx *pctx =
talloc_get_type(preq->cctx->rctx->pvt_ctx, struct pam_ctx);
char *name;
if (err_maj) {
DEBUG(2, ("Unable to get information from Data Provider\n"
"Error: %u, %u, %s\n",
(unsigned int)err_maj, (unsigned int)err_min, err_msg));
}
ret = pam_check_user_search(preq);
if (ret == EOK) {
/* Make sure we don't go to the ID provider too often */
name = preq->domain->case_sensitive ?
talloc_strdup(preq, preq->pd->user) :
sss_tc_utf8_str_tolower(preq, preq->pd->user);
if (!name) {
ret = ENOMEM;
goto done;
}
ret = pam_initgr_cache_set(pctx->rctx->ev, pctx->id_table,
name, pctx->id_timeout);
talloc_free(name);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
("Could not save initgr timestamp. "
"Proceeding with PAM actions\n"));
/* This is non-fatal, we'll just end up going to the
* data provider again next time.
*/
}
pam_dom_forwarder(preq);
}
ret = pam_check_user_done(preq, ret);
done:
if (ret) {
preq->pd->pam_status = PAM_SYSTEM_ERR;
pam_reply(preq);
}
}
static void pam_dom_forwarder(struct pam_auth_req *preq)
{
int ret;
if (!preq->pd->domain) {
preq->pd->domain = preq->domain->name;
}
if (!NEED_CHECK_PROVIDER(preq->domain->provider)) {
preq->callback = pam_reply;
ret = LOCAL_pam_handler(preq);
}
else {
preq->callback = pam_reply;
ret = pam_dp_send_req(preq, SSS_CLI_SOCKET_TIMEOUT/2);
DEBUG(4, ("pam_dp_send_req returned %d\n", ret));
}
if (ret != EOK) {
preq->pd->pam_status = PAM_SYSTEM_ERR;
pam_reply(preq);
}
}
static int pam_cmd_authenticate(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_authenticate\n"));
return pam_forwarder(cctx, SSS_PAM_AUTHENTICATE);
}
static int pam_cmd_setcred(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_setcred\n"));
return pam_forwarder(cctx, SSS_PAM_SETCRED);
}
static int pam_cmd_acct_mgmt(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_acct_mgmt\n"));
return pam_forwarder(cctx, SSS_PAM_ACCT_MGMT);
}
static int pam_cmd_open_session(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_open_session\n"));
return pam_forwarder(cctx, SSS_PAM_OPEN_SESSION);
}
static int pam_cmd_close_session(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_close_session\n"));
return pam_forwarder(cctx, SSS_PAM_CLOSE_SESSION);
}
static int pam_cmd_chauthtok(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_chauthtok\n"));
return pam_forwarder(cctx, SSS_PAM_CHAUTHTOK);
}
static int pam_cmd_chauthtok_prelim(struct cli_ctx *cctx) {
DEBUG(4, ("entering pam_cmd_chauthtok_prelim\n"));
return pam_forwarder(cctx, SSS_PAM_CHAUTHTOK_PRELIM);
}
struct cli_protocol_version *register_cli_protocol_version(void)
{
static struct cli_protocol_version pam_cli_protocol_version[] = {
{3, "2009-09-14", "make cli_pid mandatory"},
{2, "2009-05-12", "new format <type><size><data>"},
{1, "2008-09-05", "initial version, \\0 terminated strings"},
{0, NULL, NULL}
};
return pam_cli_protocol_version;
}
struct sss_cmd_table *get_pam_cmds(void)
{
static struct sss_cmd_table sss_cmds[] = {
{SSS_GET_VERSION, sss_cmd_get_version},
{SSS_PAM_AUTHENTICATE, pam_cmd_authenticate},
{SSS_PAM_SETCRED, pam_cmd_setcred},
{SSS_PAM_ACCT_MGMT, pam_cmd_acct_mgmt},
{SSS_PAM_OPEN_SESSION, pam_cmd_open_session},
{SSS_PAM_CLOSE_SESSION, pam_cmd_close_session},
{SSS_PAM_CHAUTHTOK, pam_cmd_chauthtok},
{SSS_PAM_CHAUTHTOK_PRELIM, pam_cmd_chauthtok_prelim},
{SSS_CLI_NULL, NULL}
};
return sss_cmds;
}