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/*
SSSD
SELinux-related utility functions
Authors:
Jan Zeleny <jzeleny@redhat.com>
Copyright (C) 2012 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 "util/sss_selinux.h"
#include "util/sss_utf8.h"
#include "db/sysdb_selinux.h"
static bool match_entity(struct ldb_message_element *values,
struct ldb_message_element *sought_values)
{
int i, j;
for (i = 0; i < values->num_values; i++) {
for (j = 0; j < sought_values->num_values; j++) {
if (values->values[i].length != sought_values->values[j].length) {
continue;
}
if (strncasecmp((char *)values->values[i].data,
(char *)sought_values->values[j].data,
values->values[i].length) == 0)
return true;
}
}
return false;
}
bool sss_selinux_match(struct sysdb_attrs *usermap,
struct sysdb_attrs *user,
struct sysdb_attrs *host)
{
struct ldb_message_element *users_el = NULL;
struct ldb_message_element *usercat = NULL;
struct ldb_message_element *hosts_el = NULL;
struct ldb_message_element *hostcat = NULL;
struct ldb_message_element *dn;
struct ldb_message_element *memberof;
int i;
errno_t ret;
if (usermap == NULL) {
DEBUG(SSSDBG_MINOR_FAILURE, ("NULL given as usermap! Skipping ...\n"));
return false;
}
/* Search for user and host related elements */
for (i = 0; i < usermap->num; i++) {
if (!strcasecmp(usermap->a[i].name, SYSDB_ORIG_MEMBER_USER)) {
users_el = &usermap->a[i];
} else if (!strcasecmp(usermap->a[i].name, SYSDB_ORIG_MEMBER_HOST)) {
hosts_el = &usermap->a[i];
} else if (!strcasecmp(usermap->a[i].name, SYSDB_USER_CATEGORY)) {
usercat = &usermap->a[i];
} else if (!strcasecmp(usermap->a[i].name, SYSDB_HOST_CATEGORY)) {
hostcat = &usermap->a[i];
}
}
if (user) {
ret = sysdb_attrs_get_el(user, SYSDB_ORIG_DN, &dn);
if (ret != EOK) return false;
ret = sysdb_attrs_get_el(user, SYSDB_ORIG_MEMBEROF, &memberof);
if (ret != EOK) return false;
/**
* The rule won't match if user category != "all" and user map doesn't
* contain neither user nor any of his groups in memberUser attribute
*/
if (usercat == NULL || usercat->num_values == 0 ||
strcasecmp((char *)usercat->values[0].data, "all") != 0) {
if (users_el == NULL || (!match_entity(users_el, dn) &&
!match_entity(users_el, memberof))) {
return false;
}
}
}
if (host) {
ret = sysdb_attrs_get_el(host, SYSDB_ORIG_DN, &dn);
if (ret != EOK) return false;
ret = sysdb_attrs_get_el(host, SYSDB_ORIG_MEMBEROF, &memberof);
if (ret != EOK) return false;
/**
* The rule won't match if host category != "all" and user map doesn't
* contain neither host nor any of its groups in memberHost attribute
*/
if (hostcat == NULL || hostcat->num_values == 0 ||
strcasecmp((char *)hostcat->values[0].data, "all") != 0) {
if (hosts_el == NULL || (!match_entity(hosts_el, dn) &&
!match_entity(hosts_el, memberof))) {
return false;
}
}
}
return true;
}
errno_t sss_selinux_extract_user(TALLOC_CTX *mem_ctx,
struct sysdb_ctx *sysdb,
const char *username,
struct sysdb_attrs **_user_attrs)
{
TALLOC_CTX *tmp_ctx;
const char **attrs;
struct sysdb_attrs *user_attrs;
struct ldb_message *user_msg;
errno_t ret;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
ret = ENOMEM;
goto done;
}
attrs = talloc_array(tmp_ctx, const char *, 3);
if (attrs == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, ("talloc_array failed.\n"));
ret = ENOMEM;
goto done;
}
attrs[0] = SYSDB_ORIG_DN;
attrs[1] = SYSDB_ORIG_MEMBEROF;
attrs[2] = NULL;
ret = sysdb_search_user_by_name(tmp_ctx, sysdb, username,
attrs, &user_msg);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE, ("sysdb_search_user_by_name failed.\n"));
goto done;
}
user_attrs = talloc_zero(tmp_ctx, struct sysdb_attrs);
if (user_attrs == NULL) {
ret = ENOMEM;
goto done;
}
user_attrs->a = talloc_steal(user_attrs, user_msg->elements);
user_attrs->num = user_msg->num_elements;
*_user_attrs = talloc_steal(mem_ctx, user_attrs);
ret = EOK;
done:
talloc_free(tmp_ctx);
return ret;
}
const char *sss_selinux_map_get_seuser(struct ldb_message *usermap)
{
int i;
const uint8_t *name;
const uint8_t *template = (const uint8_t *)SYSDB_SELINUX_USER;
for (i = 0; i < usermap->num_elements; i++) {
name = (const uint8_t *)usermap->elements[i].name;
if (sss_utf8_case_eq(name, template) == 0) {
return (const char *)usermap->elements[i].values[0].data;
}
}
return NULL;
}
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