nsssrv_netgroup.c revision e563de9203be581acc30c7794f568ae40d22bee0
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase/*
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase SSSD
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase nsssrv_netgroup.c
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase Authors:
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase Stephen Gallagher <sgallagh@redhat.com>
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase Copyright (C) 2010 Red Hat
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase This program is free software; you can redistribute it and/or modify
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase it under the terms of the GNU General Public License as published by
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase the Free Software Foundation; either version 3 of the License, or
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase (at your option) any later version.
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase This program is distributed in the hope that it will be useful,
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase but WITHOUT ANY WARRANTY; without even the implied warranty of
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase GNU General Public License for more details.
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase You should have received a copy of the GNU General Public License
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase along with this program. If not, see <http://www.gnu.org/licenses/>.
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase*/
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "util/util.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "responder/nss/nsssrv.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "responder/nss/nsssrv_private.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "responder/nss/nsssrv_netgroup.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "responder/common/negcache.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "confdb/confdb.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase#include "db/sysdb.h"
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehasestatic errno_t get_netgroup_entry(struct nss_ctx *nctx,
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase char *name,
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase struct getent_ctx **netgr)
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase{
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase hash_key_t key;
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase hash_value_t value;
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase int hret;
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase key.type = HASH_KEY_STRING;
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase key.str = name;
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase hret = hash_lookup(nctx->netgroups, &key, &value);
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase if (hret == HASH_SUCCESS) {
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase *netgr = talloc_get_type(value.ptr, struct getent_ctx);
f5ce2d234d8a23051090e64223ae4364662ae502Tim Reddehase return EOK;
} else if (hret == HASH_ERROR_KEY_NOT_FOUND) {
return ENOENT;
}
DEBUG(SSSDBG_CRIT_FAILURE,
"Unexpected error reading from netgroup hash [%d][%s]\n",
hret, hash_error_string(hret));
return EIO;
}
static int netgr_hash_remove(TALLOC_CTX *ctx);
static errno_t set_netgroup_entry(struct nss_ctx *nctx,
struct getent_ctx *netgr)
{
hash_key_t key;
hash_value_t value;
int hret;
if (netgr->name == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "Missing netgroup name.\n");
return EINVAL;
}
/* Add this entry to the hash table */
key.type = HASH_KEY_STRING;
key.str = netgr->name;
value.type = HASH_VALUE_PTR;
value.ptr = netgr;
hret = hash_enter(nctx->netgroups, &key, &value);
if (hret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Unable to add hash table entry for [%s]\n", key.str);
DEBUG(SSSDBG_CONF_SETTINGS,
"Hash error [%d][%s]\n", hret, hash_error_string(hret));
return EIO;
}
talloc_steal(nctx->netgroups, netgr);
talloc_set_destructor((TALLOC_CTX *) netgr, netgr_hash_remove);
return EOK;
}
static struct tevent_req *setnetgrent_send(TALLOC_CTX *mem_ctx,
const char *rawname,
struct nss_cmd_ctx *cmdctx);
static void nss_cmd_setnetgrent_done(struct tevent_req *req);
int nss_cmd_setnetgrent(struct cli_ctx *client)
{
struct nss_cmd_ctx *cmdctx;
struct tevent_req *req;
const char *rawname;
uint8_t *body;
size_t blen;
errno_t ret = EOK;
/* Reset the result cursor to zero */
client->netgrent_cur = 0;
cmdctx = talloc_zero(client, struct nss_cmd_ctx);
if (!cmdctx) {
return ENOMEM;
}
cmdctx->cctx = client;
/* get netgroup name to query */
sss_packet_get_body(client->creq->in, &body, &blen);
/* if not terminated fail */
if (body[blen -1] != '\0') {
ret = EINVAL;
goto done;
}
/* If the body isn't valid UTF-8, fail */
if (!sss_utf8_check(body, blen -1)) {
ret = EINVAL;
goto done;
}
rawname = (const char *)body;
req = setnetgrent_send(cmdctx, rawname, cmdctx);
if (!req) {
DEBUG(SSSDBG_FATAL_FAILURE, "Fatal error calling setnetgrent_send\n");
ret = EIO;
goto done;
}
tevent_req_set_callback(req, nss_cmd_setnetgrent_done, cmdctx);
done:
return nss_cmd_done(cmdctx, ret);
}
static int netgr_hash_remove(TALLOC_CTX *ctx)
{
int hret;
hash_key_t key;
struct getent_ctx *netgr =
talloc_get_type(ctx, struct getent_ctx);
if (netgr->lookup_table == NULL) {
DEBUG(SSSDBG_TRACE_LIBS, "netgroup [%s] was already removed\n",
netgr->name);
return EOK;
}
key.type = HASH_KEY_STRING;
key.str = netgr->name;
/* Remove the netgroup result object from the lookup table */
hret = hash_delete(netgr->lookup_table, &key);
if (hret != HASH_SUCCESS) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Could not remove key [%s] from table! [%d][%s]\n",
netgr->name, hret, hash_error_string(hret));
return -1;
}
return 0;
}
struct setnetgrent_ctx {
struct nss_ctx *nctx;
struct nss_cmd_ctx *cmdctx;
struct nss_dom_ctx *dctx;
char *netgr_shortname;
struct getent_ctx *netgr;
const char *rawname;
};
static errno_t setnetgrent_retry(struct tevent_req *req);
static errno_t lookup_netgr_step(struct setent_step_ctx *step_ctx);
static struct tevent_req *setnetgrent_send(TALLOC_CTX *mem_ctx,
const char *rawname,
struct nss_cmd_ctx *cmdctx)
{
char *domname;
errno_t ret;
struct tevent_req *req;
struct setnetgrent_ctx *state;
struct nss_dom_ctx *dctx;
struct cli_ctx *client = cmdctx->cctx;
struct nss_ctx *nctx =
talloc_get_type(client->rctx->pvt_ctx, struct nss_ctx);
req = tevent_req_create(mem_ctx, &state, struct setnetgrent_ctx);
if (!req) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Could not create tevent request for setnetgrent\n");
return NULL;
}
state->nctx = nctx;
state->cmdctx = cmdctx;
state->rawname = rawname;
state->dctx = talloc_zero(state, struct nss_dom_ctx);
if (!state->dctx) {
ret = ENOMEM;
goto error;
}
dctx = state->dctx;
dctx->cmdctx = state->cmdctx;
ret = sss_parse_name_for_domains(state, client->rctx->domains,
NULL, rawname,
&domname, &state->netgr_shortname);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, "Invalid name received [%s]\n", rawname);
goto error;
}
DEBUG(SSSDBG_CONF_SETTINGS, "Requesting info for netgroup [%s] from [%s]\n",
state->netgr_shortname, domname?domname:"<ALL>");
if (domname) {
dctx->domain = responder_get_domain(client->rctx, domname);
if (!dctx->domain) {
ret = EINVAL;
goto error;
}
/* Save the netgroup name for getnetgrent */
client->netgr_name = talloc_strdup(client, state->netgr_shortname);
if (!client->netgr_name) {
ret = ENOMEM;
goto error;
}
} else {
/* this is a multidomain search */
dctx->domain = client->rctx->domains;
cmdctx->check_next = true;
/* Save the netgroup name for getnetgrent */
client->netgr_name = talloc_strdup(client, rawname);
if (!client->netgr_name) {
ret = ENOMEM;
goto error;
}
}
ret = setnetgrent_retry(req);
if (ret != EOK) {
if (ret == EAGAIN) {
/* We need to reenter the mainloop
* We may be refreshing the cache
*/
return req;
}
goto error;
}
return req;
error:
tevent_req_error(req, ret);
tevent_req_post(req, cmdctx->cctx->ev);
return req;
}
static errno_t setnetgrent_retry(struct tevent_req *req)
{
errno_t ret;
struct setent_step_ctx *step_ctx;
struct setnetgrent_ctx *state;
struct cli_ctx *client;
struct nss_ctx *nctx;
struct nss_cmd_ctx *cmdctx;
struct nss_dom_ctx *dctx;
state = tevent_req_data(req, struct setnetgrent_ctx);
dctx = state->dctx;
cmdctx = state->cmdctx;
client = cmdctx->cctx;
nctx = talloc_get_type(client->rctx->pvt_ctx, struct nss_ctx);
dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
/* Is the result context already available?
* Check for existing lookups for this netgroup
*/
ret = get_netgroup_entry(nctx, client->netgr_name, &state->netgr);
if (ret == EOK) {
/* Another process already requested this netgroup
* Check whether it's ready for processing.
*/
if (state->netgr->ready) {
if (state->netgr->found) {
/* Ready to process results */
tevent_req_done(req);
} else {
tevent_req_error(req, ENOENT);
}
tevent_req_post(req, nctx->rctx->ev);
/* Return EOK, otherwise this will be treated as
* an error
*/
return EOK;
}
/* Result object is still being constructed
* Register for notification when it's ready
*/
ret = nss_setent_add_ref(state, state->netgr, req);
if (ret != EOK) {
goto done;
}
/* Will return control below */
} else if (ret == ENOENT) {
/* This is the first attempt to request this netgroup
*/
state->netgr = talloc_zero(nctx, struct getent_ctx);
if (!state->netgr) {
ret = ENOMEM;
goto done;
}
dctx->netgr = state->netgr;
/* Save the name used for the lookup table
* so we can remove it in the destructor
*/
state->netgr->name = talloc_strdup(state->netgr,
client->netgr_name);
if (!state->netgr->name) {
talloc_free(state->netgr);
ret = ENOMEM;
goto done;
}
state->netgr->lookup_table = nctx->netgroups;
/* Add a reference for ourselves */
ret = nss_setent_add_ref(state, state->netgr, req);
if (ret != EOK) {
talloc_free(state->netgr);
goto done;
}
ret = set_netgroup_entry(nctx, state->netgr);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "set_netgroup_entry failed.\n");
talloc_free(state->netgr);
goto done;
}
/* Perform lookup */
step_ctx = talloc_zero(state->netgr, struct setent_step_ctx);
if (!step_ctx) {
ret = ENOMEM;
goto done;
}
/* Steal the dom_ctx onto the step_ctx so it doesn't go out of scope if
* this request is canceled while other requests are in-progress.
*/
step_ctx->dctx = talloc_steal(step_ctx, state->dctx);
step_ctx->nctx = state->nctx;
step_ctx->getent_ctx = state->netgr;
step_ctx->rctx = client->rctx;
step_ctx->check_next = cmdctx->check_next;
step_ctx->name =
talloc_strdup(step_ctx, state->netgr->name);
if (!step_ctx->name) {
ret = ENOMEM;
goto done;
}
ret = lookup_netgr_step(step_ctx);
switch (ret) {
case EOK:
break;
case EMSGSIZE:
state->netgr->ready = true;
ret = ENOENT;
/* FALLTHROUGH */
default:
goto done;
}
tevent_req_done(req);
tevent_req_post(req, cmdctx->cctx->ev);
/* Will return control below */
} else {
/* Unexpected error from hash_lookup */
goto done;
}
ret = EOK;
done:
return ret;
}
static void lookup_netgr_dp_callback(uint16_t err_maj, uint32_t err_min,
const char *err_msg, void *ptr);
static void setnetgrent_result_timeout(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval current_time,
void *pvt);
/* Set up a lifetime timer for this result object
* We don't want this result object to outlive the
* entry cache refresh timeout
*/
static void set_netgr_lifetime(uint32_t lifetime,
struct setent_step_ctx *step_ctx,
struct getent_ctx *netgr)
{
struct timeval tv;
struct tevent_timer *te;
tv = tevent_timeval_current_ofs(lifetime, 0);
te = tevent_add_timer(step_ctx->nctx->rctx->ev,
step_ctx->nctx->gctx, tv,
setnetgrent_result_timeout,
netgr);
if (!te) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Could not set up life timer for setnetgrent result object. "
"Entries may become stale.\n");
}
}
/* Create dummy netgroup to speed up repeated negative queries */
static errno_t create_negcache_netgr(struct setent_step_ctx *step_ctx)
{
errno_t ret;
struct getent_ctx *netgr;
netgr = talloc_zero(step_ctx->nctx, struct getent_ctx);
if (netgr == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "talloc_zero failed.\n");
ret = ENOMEM;
goto done;
} else {
netgr->ready = true;
netgr->found = false;
netgr->entries = NULL;
netgr->lookup_table = step_ctx->nctx->netgroups;
netgr->name = talloc_strdup(netgr, step_ctx->name);
if (netgr->name == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "talloc_strdup failed.\n");
ret = ENOMEM;
goto done;
}
ret = set_netgroup_entry(step_ctx->nctx, netgr);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "set_netgroup_entry failed.\n");
goto done;
}
set_netgr_lifetime(step_ctx->nctx->neg_timeout, step_ctx, netgr);
}
done:
if (ret != EOK) {
talloc_free(netgr);
}
return ret;
}
static errno_t lookup_netgr_step(struct setent_step_ctx *step_ctx)
{
errno_t ret;
struct sss_domain_info *dom = step_ctx->dctx->domain;
struct getent_ctx *netgr;
char *name = NULL;
uint32_t lifetime;
/* Check each domain for this netgroup name */
while (dom) {
/* Netgroups are a special case. We have to ignore the
* fully-qualified name requirement because memberNisNetgroup
* entries do not have fully-qualified components and we need
* to be able to always check them. So unlike the other
* maps, here we avoid skipping over fully-qualified domains.
*/
if (dom != step_ctx->dctx->domain) {
/* make sure we reset the check_provider flag when we check
* a new domain */
step_ctx->dctx->check_provider =
NEED_CHECK_PROVIDER(dom->provider);
}
/* make sure to update the dctx if we changed domain */
step_ctx->dctx->domain = dom;
talloc_free(name);
name = sss_get_cased_name(step_ctx, step_ctx->name,
dom->case_sensitive);
if (!name) {
DEBUG(SSSDBG_CRIT_FAILURE, "sss_get_cased_name failed\n");
ret = ENOMEM;
goto done;
}
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");
ret = EIO;
goto done;
}
/* Look up the netgroup in the cache */
ret = sysdb_getnetgr(step_ctx->dctx, dom, name, &step_ctx->dctx->res);
if (ret == EOK) {
if (step_ctx->dctx->res->count > 1) {
DEBUG(SSSDBG_FATAL_FAILURE,
"getnetgr call returned more than one result !?!\n");
ret = EMSGSIZE;
goto done;
}
} else if (ret == ENOENT) {
/* This netgroup was not found in this domain */
if (!step_ctx->dctx->check_provider) {
if (step_ctx->check_next) {
dom = get_next_domain(dom, 0);
continue;
} else {
break;
}
}
} else {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to make request to our cache!\n");
ret = EIO;
goto done;
}
ret = get_netgroup_entry(step_ctx->nctx, step_ctx->name,
&netgr);
if (ret != EOK) {
/* Something really bad happened! */
DEBUG(SSSDBG_FATAL_FAILURE, "Netgroup entry was lost!\n");
goto done;
}
/* Convert the result to a list of entries */
ret = sysdb_netgr_to_entries(netgr, step_ctx->dctx->res,
&netgr->entries);
if (ret == ENOENT) {
/* This netgroup was not found in this domain */
DEBUG(SSSDBG_OP_FAILURE, "No results for netgroup %s (domain %s)\n",
name, dom->name);
if (!step_ctx->dctx->check_provider) {
if (step_ctx->check_next) {
dom = get_next_domain(dom, 0);
continue;
}
else break;
}
ret = EOK;
}
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to convert results into entries\n");
netgr->ready = true;
netgr->found = false;
set_netgr_lifetime(step_ctx->nctx->neg_timeout, step_ctx, netgr);
ret = EIO;
goto done;
}
/* if this is a caching provider (or if we haven't checked the cache
* yet) then verify that the cache is uptodate */
if (step_ctx->dctx->check_provider) {
ret = check_cache(step_ctx->dctx,
step_ctx->nctx,
step_ctx->dctx->res,
SSS_DP_NETGR,
name, 0, NULL,
lookup_netgr_dp_callback,
step_ctx);
if (ret != EOK) {
/* May return EAGAIN legitimately to indicate that
* we need to reenter the mainloop
*/
goto done;
}
}
/* Results found */
DEBUG(SSSDBG_TRACE_FUNC, "Returning info for netgroup [%s@%s]\n",
name, dom->name);
netgr->ready = true;
netgr->found = true;
if (step_ctx->nctx->cache_refresh_percent) {
lifetime = dom->netgroup_timeout *
(step_ctx->nctx->cache_refresh_percent / 100.0);
} else {
lifetime = dom->netgroup_timeout;
}
if (lifetime < 10) lifetime = 10;
set_netgr_lifetime(lifetime, step_ctx, netgr);
ret = EOK;
goto done;
}
/* If we've gotten here, then no domain contained this netgroup */
DEBUG(SSSDBG_MINOR_FAILURE,
"No matching domain found for [%s], fail!\n", step_ctx->name);
ret = create_negcache_netgr(step_ctx);
if (ret != EOK) {
/* Failure can be ignored, because at worst, there will be a slowdown
* at the next lookup
*/
DEBUG(SSSDBG_TRACE_ALL,
"create_negcache_netgr failed with: %d:[%s], ignored.\n",
ret, sss_strerror(ret));
}
ret = ENOENT;
done:
talloc_free(name);
return ret;
}
static void lookup_netgr_dp_callback(uint16_t err_maj, uint32_t err_min,
const char *err_msg, void *ptr)
{
struct setent_step_ctx *step_ctx =
talloc_get_type(ptr, struct setent_step_ctx);
struct nss_dom_ctx *dctx = step_ctx->dctx;
struct nss_cmd_ctx *cmdctx = dctx->cmdctx;
int ret;
if (err_maj) {
DEBUG(SSSDBG_OP_FAILURE,
"Unable to get information from Data Provider\n"
"Error: %u, %u, %s\n"
"Will try to return what we have in cache\n",
(unsigned int)err_maj, (unsigned int)err_min, err_msg);
/* Loop to the next domain if possible */
if (cmdctx->check_next
&& (dctx->domain = get_next_domain(dctx->domain, 0))) {
dctx->check_provider = NEED_CHECK_PROVIDER(dctx->domain->provider);
}
}
/* ok the backend returned, search to see if we have updated results */
ret = lookup_netgr_step(step_ctx);
if (ret == EAGAIN) {
return;
}
/* We have results to return */
if (ret == EOK) {
nss_setent_notify_done(dctx->netgr);
} else {
nss_setent_notify_error(dctx->netgr, ret);
}
}
static void setnetgrent_result_timeout(struct tevent_context *ev,
struct tevent_timer *te,
struct timeval current_time,
void *pvt)
{
struct getent_ctx *netgr =
talloc_get_type(pvt, struct getent_ctx);
/* Free the netgroup result context
* The destructor for the netgroup will remove itself
* from the hash table
*
* If additional getnetgrent() requests come in, they
* will invoke an implicit setnetgrent() call and
* refresh the result object
*/
talloc_free(netgr);
}
static errno_t setnetgrent_recv(struct tevent_req *req)
{
TEVENT_REQ_RETURN_ON_ERROR(req);
return EOK;
}
static void nss_cmd_setnetgrent_done(struct tevent_req *req)
{
errno_t reqret;
errno_t ret;
struct sss_packet *packet;
uint8_t *body;
size_t blen;
struct nss_cmd_ctx *cmdctx =
tevent_req_callback_data(req, struct nss_cmd_ctx);
reqret = setnetgrent_recv(req);
talloc_zfree(req);
if (reqret != EOK && reqret != ENOENT) {
DEBUG(SSSDBG_CRIT_FAILURE, "setnetgrent failed\n");
nss_cmd_done(cmdctx, reqret);
return;
}
/* Either we succeeded or no domains were eligible */
ret = sss_packet_new(cmdctx->cctx->creq, 0,
sss_packet_get_cmd(cmdctx->cctx->creq->in),
&cmdctx->cctx->creq->out);
if (ret == EOK) {
if (reqret == ENOENT) {
/* Notify the caller that this entry wasn't found */
sss_cmd_empty_packet(cmdctx->cctx->creq->out);
} else {
packet = cmdctx->cctx->creq->out;
ret = sss_packet_grow(packet, 2*sizeof(uint32_t));
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Couldn't grow the packet\n");
NSS_CMD_FATAL_ERROR(cmdctx);
}
sss_packet_get_body(packet, &body, &blen);
/* Got some results. */
SAFEALIGN_SETMEM_UINT32(body, 1, NULL);
/* reserved */
SAFEALIGN_SETMEM_UINT32(body + sizeof(uint32_t), 0, NULL);
}
sss_cmd_done(cmdctx->cctx, cmdctx);
return;
}
DEBUG(SSSDBG_CRIT_FAILURE, "Error creating packet\n");
}
static void setnetgrent_implicit_done(struct tevent_req *req);
static errno_t nss_cmd_getnetgrent_process(struct nss_cmd_ctx *cmdctx,
struct getent_ctx *netgr);
int nss_cmd_getnetgrent(struct cli_ctx *client)
{
errno_t ret;
struct nss_ctx *nctx;
struct nss_cmd_ctx *cmdctx;
struct getent_ctx *netgr;
struct tevent_req *req;
DEBUG(SSSDBG_CONF_SETTINGS, "Requesting netgroup data\n");
cmdctx = talloc_zero(client, struct nss_cmd_ctx);
if (!cmdctx) {
return ENOMEM;
}
cmdctx->cctx = client;
nctx = talloc_get_type(client->rctx->pvt_ctx, struct nss_ctx);
if (!client->netgr_name) {
/* Tried to run getnetgrent without a preceding
* setnetgrent. There is no way to determine which
* netgroup is being requested.
*/
return nss_cmd_done(cmdctx, EINVAL);
}
/* Look up the results from the hash */
ret = get_netgroup_entry(nctx, client->netgr_name, &netgr);
if (ret == ENOENT) {
/* We need to invoke an implicit setnetgrent() to
* wait for the result object to become available.
*/
req = setnetgrent_send(cmdctx, client->netgr_name, cmdctx);
if (!req) {
return nss_cmd_done(cmdctx, EIO);
}
tevent_req_set_callback(req, setnetgrent_implicit_done, cmdctx);
return EOK;
} else if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "An unexpected error occurred: [%d][%s]\n",
ret, strerror(ret));
return nss_cmd_done(cmdctx, ret);
}
/* Hash entry was found. Is it ready? */
if (!netgr->ready) {
/* We need to invoke an implicit setnetgrent() to
* wait for the result object to become available.
*/
req = setnetgrent_send(cmdctx, client->netgr_name, cmdctx);
if (!req) {
return nss_cmd_done(cmdctx, EIO);
}
tevent_req_set_callback(req, setnetgrent_implicit_done, cmdctx);
return EOK;
} else if (!netgr->found) {
DEBUG(SSSDBG_TRACE_FUNC,
"Results for [%s] not found.\n", client->netgr_name);
return ENOENT;
}
DEBUG(SSSDBG_TRACE_FUNC,
"Returning results for [%s]\n", client->netgr_name);
/* Read the result strings */
ret = nss_cmd_getnetgrent_process(cmdctx, netgr);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Failed: [%d][%s]\n", ret, strerror(ret));
}
return ret;
}
static void setnetgrent_implicit_done(struct tevent_req *req)
{
errno_t ret;
struct getent_ctx *netgr;
struct nss_cmd_ctx *cmdctx =
tevent_req_callback_data(req, struct nss_cmd_ctx);
struct nss_ctx *nctx =
talloc_get_type(cmdctx->cctx->rctx->pvt_ctx, struct nss_ctx);
ret = setnetgrent_recv(req);
talloc_zfree(req);
/* ENOENT is acceptable, it just means there were no values
* to be returned. This will be handled gracefully in
* nss_cmd_retnetgrent later
*/
if (ret != EOK && ret != ENOENT) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Implicit setnetgrent failed with unexpected error "
"[%d][%s]\n", ret, strerror(ret));
NSS_CMD_FATAL_ERROR(cmdctx);
}
if (ret == ENOENT) {
/* No entries found for this netgroup */
nss_cmd_done(cmdctx, ret);
return;
}
/* Look up the results from the hash */
ret = get_netgroup_entry(nctx, cmdctx->cctx->netgr_name, &netgr);
if (ret == ENOENT) {
/* Critical error. This should never happen */
DEBUG(SSSDBG_FATAL_FAILURE,
"Implicit setnetgrent returned success without creating "
"result object.\n");
NSS_CMD_FATAL_ERROR(cmdctx);
} else if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "An unexpected error occurred: [%d][%s]\n",
ret, strerror(ret));
NSS_CMD_FATAL_ERROR(cmdctx);
}
if (!netgr->ready) {
/* Critical error. This should never happen */
DEBUG(SSSDBG_FATAL_FAILURE,
"Implicit setnetgrent returned success without creating "
"result object.\n");
NSS_CMD_FATAL_ERROR(cmdctx);
}
ret = nss_cmd_getnetgrent_process(cmdctx, netgr);
if (ret != EOK) {
DEBUG(SSSDBG_FATAL_FAILURE,
"Immediate retrieval failed with unexpected error "
"[%d][%s]\n", ret, strerror(ret));
NSS_CMD_FATAL_ERROR(cmdctx);
}
}
static errno_t nss_cmd_retnetgrent(struct cli_ctx *client,
struct sysdb_netgroup_ctx **entries,
int num);
static errno_t nss_cmd_getnetgrent_process(struct nss_cmd_ctx *cmdctx,
struct getent_ctx *netgr)
{
struct cli_ctx *client = cmdctx->cctx;
uint8_t *body;
size_t blen;
uint32_t num;
errno_t ret;
/* get max num of entries to return in one call */
sss_packet_get_body(client->creq->in, &body, &blen);
if (blen != sizeof(uint32_t)) {
return EINVAL;
}
SAFEALIGN_COPY_UINT32(&num, body, NULL);
/* create response packet */
ret = sss_packet_new(client->creq, 0,
sss_packet_get_cmd(client->creq->in),
&client->creq->out);
if (ret != EOK) {
return ret;
}
if (!netgr->entries || netgr->entries[0] == NULL) {
/* No entries */
DEBUG(SSSDBG_FUNC_DATA, "No entries found\n");
ret = sss_cmd_empty_packet(client->creq->out);
if (ret != EOK) {
return nss_cmd_done(cmdctx, ret);
}
goto done;
}
ret = nss_cmd_retnetgrent(client, netgr->entries, num);
done:
sss_packet_set_error(client->creq->out, ret);
sss_cmd_done(client, cmdctx);
return EOK;
}
static errno_t nss_cmd_retnetgrent(struct cli_ctx *client,
struct sysdb_netgroup_ctx **entries,
int count)
{
size_t len;
size_t hostlen = 0;
size_t userlen = 0;
size_t domainlen = 0;
size_t grouplen = 0;
uint8_t *body;
size_t blen, rp;
errno_t ret;
struct sss_packet *packet = client->creq->out;
int num, start;
/* first 2 fields (len and reserved), filled up later */
rp = 2*sizeof(uint32_t);
ret = sss_packet_grow(packet, rp);
if (ret != EOK) return ret;
start = client->netgrent_cur;
num = 0;
while (entries[client->netgrent_cur] &&
(client->netgrent_cur - start) < count) {
if (entries[client->netgrent_cur]->type == SYSDB_NETGROUP_TRIPLE_VAL) {
hostlen = 1;
if (entries[client->netgrent_cur]->value.triple.hostname) {
hostlen += strlen(entries[client->netgrent_cur]->value.triple.hostname);
}
userlen = 1;
if (entries[client->netgrent_cur]->value.triple.username) {
userlen += strlen(entries[client->netgrent_cur]->value.triple.username);
}
domainlen = 1;
if (entries[client->netgrent_cur]->value.triple.domainname) {
domainlen += strlen(entries[client->netgrent_cur]->value.triple.domainname);
}
len = sizeof(uint32_t) + hostlen + userlen + domainlen;
ret = sss_packet_grow(packet, len);
if (ret != EOK) {
return ret;
}
sss_packet_get_body(packet, &body, &blen);
SAFEALIGN_SET_UINT32(&body[rp], SSS_NETGR_REP_TRIPLE, &rp);
if (hostlen == 1) {
body[rp] = '\0';
} else {
memcpy(&body[rp],
entries[client->netgrent_cur]->value.triple.hostname,
hostlen);
}
rp += hostlen;
if (userlen == 1) {
body[rp] = '\0';
} else {
memcpy(&body[rp],
entries[client->netgrent_cur]->value.triple.username,
userlen);
}
rp += userlen;
if (domainlen == 1) {
body[rp] = '\0';
} else {
memcpy(&body[rp],
entries[client->netgrent_cur]->value.triple.domainname,
domainlen);
}
rp += domainlen;
} else if (entries[client->netgrent_cur]->type == SYSDB_NETGROUP_GROUP_VAL) {
if (entries[client->netgrent_cur]->value.groupname == NULL ||
entries[client->netgrent_cur]->value.groupname[0] == '\0') {
DEBUG(SSSDBG_CRIT_FAILURE,
"Empty netgroup member. Please check your cache.\n");
continue;
}
grouplen = 1 + strlen(entries[client->netgrent_cur]->value.groupname);
len = sizeof(uint32_t) + grouplen;
ret = sss_packet_grow(packet, len);
if (ret != EOK) {
return ret;
}
sss_packet_get_body(packet, &body, &blen);
SAFEALIGN_SET_UINT32(&body[rp], SSS_NETGR_REP_GROUP, &rp);
memcpy(&body[rp],
entries[client->netgrent_cur]->value.groupname,
grouplen);
rp += grouplen;
} else {
DEBUG(SSSDBG_CRIT_FAILURE,
"Unexpected value type for netgroup entry. "
"Please check your cache.\n");
continue;
}
num++;
client->netgrent_cur++;
}
sss_packet_get_body(packet, &body, &blen);
/* num results */
SAFEALIGN_COPY_UINT32(body, &num, NULL);
/* reserved */
SAFEALIGN_SETMEM_UINT32(body + sizeof(uint32_t), 0, NULL);
return EOK;
}
int nss_cmd_endnetgrent(struct cli_ctx *client)
{
errno_t ret;
/* create response packet */
ret = sss_packet_new(client->creq, 0,
sss_packet_get_cmd(client->creq->in),
&client->creq->out);
if (ret != EOK) {
return ret;
}
/* Reset the indices so that subsequent requests start at zero */
client->netgrent_cur = 0;
talloc_zfree(client->netgr_name);
sss_cmd_done(client, NULL);
return EOK;
}
void
netgroup_hash_delete_cb(hash_entry_t *item,
hash_destroy_enum deltype, void *pvt)
{
struct getent_ctx *netgr;
if (deltype != HASH_ENTRY_DESTROY) {
return;
}
netgr = talloc_get_type(item->value.ptr, struct getent_ctx);
if (!netgr) {
DEBUG(SSSDBG_OP_FAILURE, "Invalid netgroup\n");
return;
}
/* So that the destructor wouldn't attempt to remove the netgroup from hash
* table */
netgr->lookup_table = NULL;
}
errno_t nss_orphan_netgroups(struct nss_ctx *nctx)
{
int hret;
unsigned long mcount;
unsigned long i;
hash_key_t *netgroups;
if (!nctx || !nctx->netgroups) {
return EINVAL;
}
hret = hash_keys(nctx->netgroups, &mcount, &netgroups);
if (hret != HASH_SUCCESS) {
return EIO;
}
DEBUG(SSSDBG_TRACE_FUNC, "Removing netgroups from memory cache.\n");
for (i = 0; i < mcount; i++) {
/* netgroup entry will be deleted by setnetgrent_result_timeout */
hret = hash_delete(nctx->netgroups, &netgroups[i]);
if (hret != HASH_SUCCESS) {
DEBUG(SSSDBG_MINOR_FAILURE, "Could not delete key from hash\n");
continue;
}
}
return EOK;
}