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/*
SSSD
AD GPO Backend Module -- helpers for a child process
Copyright (C) 2022 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 <errno.h>
#include <ctype.h>
#include <string.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <ini_configobj.h>
#include <talloc.h>
#include "util/util_errors.h"
#include "util/debug.h"
#include "util/atomic_io.h"
#define INI_GENERAL_SECTION "General"
#define GPT_INI_VERSION "Version"
static errno_t parse_ini_file_with_libini(struct ini_cfgobj *ini_config,
int *_gpt_version)
{
int ret;
struct value_obj *vobj = NULL;
int gpt_version;
ret = ini_get_config_valueobj(INI_GENERAL_SECTION, GPT_INI_VERSION,
ini_config, INI_GET_FIRST_VALUE, &vobj);
if (ret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"ini_get_config_valueobj failed [%d][%s]\n", ret, strerror(ret));
goto done;
}
if (vobj == NULL) {
DEBUG(SSSDBG_CRIT_FAILURE, "section/name not found: [%s][%s]\n",
INI_GENERAL_SECTION, GPT_INI_VERSION);
ret = EINVAL;
goto done;
}
gpt_version = ini_get_int32_config_value(vobj, 0, -1, &ret);
if (ret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"ini_get_int32_config_value failed [%d][%s]\n",
ret, strerror(ret));
goto done;
}
*_gpt_version = gpt_version;
ret = EOK;
done:
return ret;
}
static errno_t gpo_sanitize_buffer_content(uint8_t *buf, int buflen)
{
int i;
int line_start = 0;
int equal_pos = 0;
if (!buf) {
return EINVAL;
}
for (i = 0; i < buflen; ++i) {
if (buf[i] == '\n') {
line_start = i + 1;
continue;
}
if (buf[i] == '=') {
equal_pos = i;
continue;
}
if (isascii(buf[i])) {
continue;
}
/* non-ascii */
if (equal_pos <= line_start) { /* key */
DEBUG(SSSDBG_OP_FAILURE,
"Key or section starting at position %d ('%.*s...') contains"
" non-ascii symbol. File is unusable!\n",
line_start, i - line_start, buf + line_start);
return EINVAL;
}
buf[i] = '?';
DEBUG(SSSDBG_IMPORTANT_INFO,
"Value for key '%.*s' contains non-ascii symbol."
" Replacing with '?'\n",
equal_pos - line_start, buf + line_start);
}
return EOK;
}
/*
* This function parses the GPT_INI file stored in the gpo_cache, and uses the
* results to populate the output parameters ...
*/
errno_t ad_gpo_parse_ini_file(const char *ini_filename, int *_gpt_version)
{
struct ini_cfgfile *file_ctx = NULL;
struct ini_cfgobj *ini_config = NULL;
int ret;
int gpt_version = -1;
TALLOC_CTX *tmp_ctx = NULL;
struct stat st;
int fd = -1;
uint8_t *buf = NULL;
tmp_ctx = talloc_new(NULL);
if (tmp_ctx == NULL) {
ret = ENOMEM;
goto done;
}
DEBUG(SSSDBG_TRACE_FUNC, "ini_filename:%s\n", ini_filename);
ret = ini_config_create(&ini_config);
if (ret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"ini_config_create failed [%d][%s]\n", ret, strerror(ret));
goto done;
}
fd = open(ini_filename, O_RDONLY);
if (fd == -1) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
"open() failed [%d][%s]\n", ret, strerror(ret));
ret = EIO;
goto done;
}
ret = fstat(fd, &st);
if (ret != 0) {
ret = errno;
DEBUG(SSSDBG_CRIT_FAILURE,
"stat() failed [%d][%s]\n", ret, strerror(ret));
ret = EIO;
goto done;
}
buf = talloc_size(tmp_ctx, st.st_size);
if (buf == NULL) {
ret = ENOMEM;
goto done;
}
if (sss_atomic_read_s(fd, buf, st.st_size) != st.st_size) {
ret = EIO;
DEBUG(SSSDBG_CRIT_FAILURE,
"sss_atomic_read_s() failed\n");
goto done;
}
/* Windows uses ANSI (extended-ASCII) to encode the GPT.INI file.
* Practically this might mean any code page, including uncompatible
* with UTF. Since the only value read by SSSD from GPT.INI is
* 'Version=...', just get rid of any non-ascii characters to make
* content compatible with lib_iniconfig.
*/
ret = gpo_sanitize_buffer_content(buf, st.st_size);
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "gpo_sanitize_buffer_content() failed\n");
goto done;
}
ret = ini_config_file_from_mem(buf, st.st_size, &file_ctx);
if (ret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"ini_config_file_from_mem() failed [%d][%s]\n", ret, strerror(ret));
goto done;
}
ret = ini_config_parse(file_ctx, INI_STOP_ON_NONE, 0, 0, ini_config);
if (ret != 0) {
int lret;
char **errors;
DEBUG(SSSDBG_CRIT_FAILURE,
"[%s]: ini_config_parse failed [%d][%s]\n",
ini_filename, ret, strerror(ret));
/* Now get specific errors if there are any */
lret = ini_config_get_errors(ini_config, &errors);
if (lret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"Failed to get specific parse error [%d][%s]\n", lret,
strerror(lret));
goto done;
}
for (int i = 0; errors[i]; i++) {
DEBUG(SSSDBG_CRIT_FAILURE, "%s\n", errors[i]);
}
ini_config_free_errors(errors);
goto done;
}
ret = parse_ini_file_with_libini(ini_config, &gpt_version);
if (ret != 0) {
DEBUG(SSSDBG_CRIT_FAILURE,
"parse_ini_file_with_libini failed [%d][%s]\n",
ret, strerror(ret));
goto done;
}
*_gpt_version = gpt_version;
done:
if (ret != EOK) {
DEBUG(SSSDBG_CRIT_FAILURE, "Error encountered: %d.\n", ret);
}
ini_config_file_destroy(file_ctx);
ini_config_destroy(ini_config);
if (fd != -1) close(fd);
talloc_free(tmp_ctx);
return ret;
}
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