sudosrv_query.c revision 46d3d2c731e8c7e138462e5b60a39a279dc77d81
/*
Authors:
Pavel Březina <pbrezina@redhat.com>
Copyright (C) 2011 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 <string.h>
#include <stdint.h>
#include <errno.h>
#include <talloc.h>
#include "util/util.h"
#include "responder/sudo/sudosrv_private.h"
static int sudosrv_response_append_string(TALLOC_CTX *mem_ctx,
const char *str,
size_t str_len,
uint8_t **_response_body,
size_t *_response_len)
{
size_t response_len = *_response_len;
uint8_t *response_body = *_response_body;
response_body = talloc_realloc(mem_ctx, response_body, uint8_t,
response_len + (str_len * sizeof(char)));
if (response_body == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
return ENOMEM;
}
memcpy(response_body + response_len, str, str_len);
response_len += str_len;
*_response_body = response_body;
*_response_len = response_len;
return EOK;
}
static int sudosrv_response_append_uint32(TALLOC_CTX *mem_ctx,
uint32_t number,
uint8_t **_response_body,
size_t *_response_len)
{
size_t response_len = *_response_len;
uint8_t *response_body = *_response_body;
response_body = talloc_realloc(mem_ctx, response_body, uint8_t,
response_len + sizeof(int));
if (response_body == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_realloc() failed\n"));
return ENOMEM;
}
SAFEALIGN_SET_UINT32(response_body + response_len, number, &response_len);
*_response_body = response_body;
*_response_len = response_len;
return EOK;
}
static int sudosrv_response_append_attr(TALLOC_CTX *mem_ctx,
const char *name,
unsigned int values_num,
struct ldb_val *values,
uint8_t **_response_body,
size_t *_response_len)
{
uint8_t *response_body = *_response_body;
size_t response_len = *_response_len;
TALLOC_CTX *tmp_ctx = NULL;
int i = 0;
int ret = EOK;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
return ENOMEM;
}
/* attr name */
ret = sudosrv_response_append_string(tmp_ctx, name, strlen(name) + 1,
&response_body, &response_len);
if (ret != EOK) {
goto done;
}
/* values count */
ret = sudosrv_response_append_uint32(tmp_ctx, values_num,
&response_body, &response_len);
if (ret != EOK) {
goto done;
}
/* values */
for (i = 0; i < values_num; i++) {
if (strlen((char*)(values[i].data)) != values[i].length) {
DEBUG(SSSDBG_CRIT_FAILURE, ("value is not a string"));
ret = EINVAL;
goto done;
}
ret = sudosrv_response_append_string(tmp_ctx,
(const char*)values[i].data,
values[i].length + 1,
&response_body, &response_len);
if (ret != EOK) {
goto done;
}
}
*_response_body = talloc_steal(mem_ctx, response_body);
*_response_len = response_len;
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
static int sudosrv_response_append_rule(TALLOC_CTX *mem_ctx,
int attrs_num,
struct ldb_message_element *attrs,
uint8_t **_response_body,
size_t *_response_len)
{
uint8_t *response_body = *_response_body;
size_t response_len = *_response_len;
TALLOC_CTX *tmp_ctx = NULL;
int i = 0;
int ret = EOK;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
return ENOMEM;
}
/* attrs count */
ret = sudosrv_response_append_uint32(tmp_ctx, attrs_num,
&response_body, &response_len);
if (ret != EOK) {
goto done;
}
/* attrs */
for (i = 0; i < attrs_num; i++) {
ret = sudosrv_response_append_attr(tmp_ctx, attrs[i].name,
attrs[i].num_values, attrs[i].values,
&response_body, &response_len);
if (ret != EOK) {
goto done;
}
}
*_response_body = talloc_steal(mem_ctx, response_body);
*_response_len = response_len;
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
/*
* Response format:
* <error_code(uint32_t)><domain(char*)>\0<num_entries(uint32_t)><rule1><rule2>...
* <ruleN> = <num_attrs(uint32_t)><attr1><attr2>...
* <attrN> = <name(char*)>\0<num_values(uint32_t)><value1(char*)>\0<value2(char*)>\0...
*
* if <error_code> is not SSS_SUDO_ERROR_OK, the rest of the data is skipped.
*/
errno_t sudosrv_build_response(TALLOC_CTX *mem_ctx,
uint32_t error,
const char *domain,
int rules_num,
struct sysdb_attrs **rules,
uint8_t **_response_body,
size_t *_response_len)
{
uint8_t *response_body = NULL;
size_t response_len = 0;
TALLOC_CTX *tmp_ctx = NULL;
int i = 0;
errno_t ret = EOK;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
return ENOMEM;
}
/* error code */
ret = sudosrv_response_append_uint32(tmp_ctx, error,
&response_body, &response_len);
if (ret != EOK) {
goto fail;
}
if (error != SSS_SUDO_ERROR_OK) {
goto done;
}
/* domain name */
ret = sudosrv_response_append_string(tmp_ctx, domain, strlen(domain) + 1,
&response_body, &response_len);
if (ret != EOK) {
goto fail;
}
/* rules count */
ret = sudosrv_response_append_uint32(tmp_ctx, (uint32_t)rules_num,
&response_body, &response_len);
if (ret != EOK) {
goto fail;
}
/* rules */
for (i = 0; i < rules_num; i++) {
ret = sudosrv_response_append_rule(tmp_ctx, rules[i]->num, rules[i]->a,
&response_body, &response_len);
if (ret != EOK) {
goto fail;
}
}
done:
*_response_body = talloc_steal(mem_ctx, response_body);
*_response_len = response_len;
ret = EOK;
fail:
talloc_free(tmp_ctx);
return ret;
}
/*
* Query format:
* <uid><username[@domain]>
*/
errno_t sudosrv_parse_query(TALLOC_CTX *mem_ctx,
struct resp_ctx *rctx,
uint8_t *query_body,
size_t query_len,
uid_t *_uid,
char **_username,
struct sss_domain_info **_domain)
{
TALLOC_CTX *tmp_ctx = NULL;
struct sss_domain_info *domain = NULL;
size_t offset = 0;
size_t rawname_len = 0;
char *rawname = NULL;
char *domainname = NULL;
char *username = NULL;
uid_t uid;
errno_t ret;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_new() failed\n"));
return ENOMEM;
}
/* uid */
if (query_len < sizeof(uid_t)) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Query is too small\n"));
ret = EINVAL;
goto done;
}
safealign_memcpy(&uid, query_body, sizeof(uid_t), &offset);
/* username[@domain] */
rawname = (char*)(query_body + offset);
rawname_len = query_len - offset; /* strlen + zero */
if (rawname[rawname_len - 1] != '\0') {
DEBUG(SSSDBG_CRIT_FAILURE, ("Username is not zero terminated\n"));
ret = EINVAL;
goto done;
}
if (rawname_len < 2) { /* at least one character and zero */
DEBUG(SSSDBG_CRIT_FAILURE, ("Query does not contain username\n"));
ret = EINVAL;
goto done;
}
if (!sss_utf8_check((uint8_t*)rawname, rawname_len - 1)) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Supplied data is not valid UTF-8 string\n"));
ret = EINVAL;
goto done;
}
/* parse username */
ret = sss_parse_name_for_domains(tmp_ctx, rctx->domains, rawname,
&domainname, &username);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, ("Invalid name received [%s]\n", rawname));
goto done;
}
if (domainname != NULL) {
/* mem_ctx because it duplicates only subdomains not domains
* so I cannot easily steal it */
domain = responder_get_domain(mem_ctx, rctx, domainname);
if (domain == NULL) {
ret = ENOENT;
goto done;
}
}
*_uid = uid;
*_username = talloc_steal(mem_ctx, username);
*_domain = domain; /* do not steal on mem_ctx */
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}