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// SPDX-License-Identifier: GPL-2.0-or-later
#include <pwd.h>
#include <ctype.h>
#include <errno.h>
#include <libeconf.h>
#include "basics.h"
#include "read_config.h"
struct config_t *
struct_config_free(struct config_t *cfg)
{
cfg->allow_get_user_record = mfree(cfg->allow_get_user_record);
cfg->allow_verify_password = mfree(cfg->allow_verify_password);
cfg->allow_expired_check = mfree(cfg->allow_expired_check);
return NULL;
}
/* trim leading and trailing whitespaces */
static char *
trim_whitespace(char *str)
{
char *end;
while(isspace((unsigned char)*str))
str++;
if(*str == '\0')
return str;
end = str + strlen(str) - 1;
while(end > str && isspace((unsigned char)*end))
end--;
*(end+1) = 0;
return str;
}
/* function to resolve a single user string (name or UID) to a uid_t
Returns 0 on success, -errno on failure */
static int
parse_token(const char *token, uid_t *result_uid)
{
if (isempty(token))
return -EINVAL;
/* if the first character is a number, it must be a UID */
if (isdigit(token[0]))
{
char *ep;
long long ll;
errno = 0;
ll = strtol(token, &ep, 10);
if (errno == ERANGE || ll < 0 || ll > UINT32_MAX ||
token == ep || *ep != '\0')
{
if (errno == 0)
return -EINVAL;
else
return -errno;
}
*result_uid = (uid_t)ll;
return 0;
}
else /* Try as username */
{
struct passwd *pwd;
errno = 0;
pwd = getpwnam(token);
if (pwd == NULL)
{
if (errno == 0)
return -ENODATA;
else
return -errno;
}
*result_uid = pwd->pw_uid;
}
return 0;
}
static econf_err
lookup_group(econf_file *key_file, const char *group, uid_t **list)
{
_cleanup_free_ char *value = NULL;
_cleanup_free_ uid_t *uids = NULL;
econf_err error;
*list = NULL;
/* look at first in method specific group */
error = econf_getStringValue(key_file, group, "allow", &value);
if (error == ECONF_NOKEY || error == ECONF_NOGROUP)
/* Fallback if key not found */
error = econf_getStringValue(key_file, "global", "allow", &value);
if (error == ECONF_NOKEY || error == ECONF_NOGROUP)
/* no data, done */
return ECONF_SUCCESS;
/* error out in other cases */
if (error != ECONF_SUCCESS)
return error;
if (isempty(value))
return ECONF_SUCCESS;
/* split value into tokens and parse them */
/* count number of tokens */
size_t count = 0;
for (size_t i = 0; value[i] != '\0'; i++)
if (value[i] == ',')
count++;
count++;
/* allocate one more slot for the final "NULL" */
uids = calloc(count + 1, sizeof (uid_t));
if (uids == NULL)
return ECONF_NOMEM;
/* Split and store */
count = 0;
char *token = strtok(value, ",");
while (token != NULL)
{
uid_t uid = 0;
int r;
token = trim_whitespace(token);
r = parse_token(token, &uid);
token = strtok(NULL, ",");
if (r < 0)
{
/* XXX we need a good warning */
continue; /* continue with the other user */
}
if (uid == 0) /* root is allways allowed, ignore */
continue;
uids[count++] = uid;
}
uids[count] = 0;
*list = TAKE_PTR(uids);
return ECONF_SUCCESS;
}
/* we will read everything and only report the firstx error */
econf_err
read_config(struct config_t *cfg)
{
_cleanup_(econf_freeFilep) econf_file *key_file = NULL;
econf_err error;
econf_err retval = ECONF_SUCCESS;
#ifdef TESTSDIR
error = econf_newKeyFile_with_options(&key_file, "ROOT_PREFIX="TESTSDIR);
if (error)
return error;
#endif
/* This looks for pwaccessd.conf{.d} in /usr/share/account-utils/
or /etc/account-utils/ */
error = econf_readConfig(&key_file,
"account-utils", /* project name */
"/usr/share", /* directory below /usr */
"pwaccessd", /* file name without extension */
"conf", /* suffix */
"=", /* delimiter */
"#"); /* comment */
if (error != ECONF_SUCCESS)
return error;
/* XXX read debug_level from [global] and set max_log_level */
error = lookup_group(key_file, "GetUserRecord", &(cfg->allow_get_user_record));
if (error && !retval)
retval = error;
error = lookup_group(key_file, "VerifyPassword", &(cfg->allow_verify_password));
if (error && !retval)
retval = error;
error = lookup_group(key_file, "ExpiredCheck", &(cfg->allow_expired_check));
if (error && !retval)
return error;
return retval;
}
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