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/*
SSSD
Common Responder utility functions
Copyright (C) Sumit Bose <sbose@redhat.com> 2014
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 <talloc.h>
#include "util/util.h"
static inline bool
attr_in_list(const char **list, size_t nlist, const char *str)
{
size_t i;
for (i = 0; i < nlist; i++) {
if (strcasecmp(list[i], str) == 0) {
break;
}
}
return (i < nlist) ? true : false;
}
const char **parse_attr_list_ex(TALLOC_CTX *mem_ctx, const char *conf_str,
const char **defaults)
{
TALLOC_CTX *tmp_ctx;
errno_t ret;
const char **list = NULL;
const char **res = NULL;
int list_size;
char **conf_list = NULL;
int conf_list_size = 0;
const char **allow = NULL;
const char **deny = NULL;
int ai = 0, di = 0, li = 0;
int i;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
return NULL;
}
if (conf_str) {
ret = split_on_separator(tmp_ctx, conf_str, ',', true, true,
&conf_list, &conf_list_size);
if (ret != EOK) {
DEBUG(SSSDBG_OP_FAILURE,
"Cannot parse attribute ACL list %s: %d\n", conf_str, ret);
goto done;
}
allow = talloc_zero_array(tmp_ctx, const char *, conf_list_size);
deny = talloc_zero_array(tmp_ctx, const char *, conf_list_size);
if (allow == NULL || deny == NULL) {
goto done;
}
}
for (i = 0; i < conf_list_size; i++) {
switch (conf_list[i][0]) {
case '+':
allow[ai] = conf_list[i] + 1;
ai++;
continue;
case '-':
deny[di] = conf_list[i] + 1;
di++;
continue;
default:
DEBUG(SSSDBG_CRIT_FAILURE, "ACL values must start with "
"either '+' (allow) or '-' (deny), got '%s'\n",
conf_list[i]);
goto done;
}
}
/* Assume the output will have to hold defaults and all the configured,
* values, resize later
*/
list_size = 0;
if (defaults != NULL) {
while (defaults[list_size]) {
list_size++;
}
}
list_size += conf_list_size;
list = talloc_zero_array(tmp_ctx, const char *, list_size + 1);
if (list == NULL) {
goto done;
}
/* Start by copying explicitly allowed attributes */
for (i = 0; i < ai; i++) {
/* if the attribute is explicitly denied, skip it */
if (attr_in_list(deny, di, allow[i])) {
continue;
}
list[li] = talloc_strdup(list, allow[i]);
if (list[li] == NULL) {
goto done;
}
li++;
DEBUG(SSSDBG_TRACE_INTERNAL,
"Added allowed attr %s to whitelist\n", allow[i]);
}
/* Add defaults */
if (defaults != NULL) {
for (i = 0; defaults[i]; i++) {
/* if the attribute is explicitly denied, skip it */
if (attr_in_list(deny, di, defaults[i])) {
continue;
}
list[li] = talloc_strdup(list, defaults[i]);
if (list[li] == NULL) {
goto done;
}
li++;
DEBUG(SSSDBG_TRACE_INTERNAL,
"Added default attr %s to whitelist\n", defaults[i]);
}
}
res = talloc_steal(mem_ctx, list);
done:
talloc_free(tmp_ctx);
return res;
}
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