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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include "chase-symlinks.h"
#include "fd-util.h"
#include "offline-passwd.h"
#include "path-util.h"
#include "user-util.h"
DEFINE_PRIVATE_HASH_OPS_WITH_KEY_DESTRUCTOR(uid_gid_hash_ops, char, string_hash_func, string_compare_func, free);
static int open_passwd_file(const char *root, const char *fname, FILE **ret_file) {
_cleanup_free_ char *p = NULL, *bn = NULL;
_cleanup_close_ int fd = -EBADF;
int r;
fd = chase_symlinks_and_open(fname, root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC, &p);
if (fd < 0)
return fd;
FILE *f = fdopen(fd, "r");
if (!f)
return -errno;
TAKE_FD(fd);
r = path_extract_filename(fname, &bn);
if (r < 0)
return r;
log_debug("Reading %s entries from %s...", bn, p);
*ret_file = f;
return 0;
}
static int populate_uid_cache(const char *root, Hashmap **ret) {
_cleanup_(hashmap_freep) Hashmap *cache = NULL;
int r;
cache = hashmap_new(&uid_gid_hash_ops);
if (!cache)
return -ENOMEM;
/* The directory list is hardcoded here: /etc is the standard, and rpm-ostree uses /usr/lib. This
* could be made configurable, but I don't see the point right now. */
FOREACH_STRING(fname, "/etc/passwd", "/usr/lib/passwd") {
_cleanup_fclose_ FILE *f = NULL;
r = open_passwd_file(root, fname, &f);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
struct passwd *pw;
while ((r = fgetpwent_sane(f, &pw)) > 0) {
_cleanup_free_ char *n = NULL;
n = strdup(pw->pw_name);
if (!n)
return -ENOMEM;
r = hashmap_put(cache, n, UID_TO_PTR(pw->pw_uid));
if (IN_SET(r, 0, -EEXIST))
continue;
if (r < 0)
return r;
TAKE_PTR(n);
}
}
*ret = TAKE_PTR(cache);
return 0;
}
static int populate_gid_cache(const char *root, Hashmap **ret) {
_cleanup_(hashmap_freep) Hashmap *cache = NULL;
int r;
cache = hashmap_new(&uid_gid_hash_ops);
if (!cache)
return -ENOMEM;
FOREACH_STRING(fname, "/etc/group", "/usr/lib/group") {
_cleanup_fclose_ FILE *f = NULL;
r = open_passwd_file(root, fname, &f);
if (r == -ENOENT)
continue;
if (r < 0)
return r;
struct group *gr;
while ((r = fgetgrent_sane(f, &gr)) > 0) {
_cleanup_free_ char *n = NULL;
n = strdup(gr->gr_name);
if (!n)
return -ENOMEM;
r = hashmap_put(cache, n, GID_TO_PTR(gr->gr_gid));
if (IN_SET(r, 0, -EEXIST))
continue;
if (r < 0)
return r;
TAKE_PTR(n);
}
}
*ret = TAKE_PTR(cache);
return 0;
}
int name_to_uid_offline(
const char *root,
const char *user,
uid_t *ret_uid,
Hashmap **cache) {
void *found;
int r;
assert(user);
assert(ret_uid);
assert(cache);
if (!*cache) {
r = populate_uid_cache(root, cache);
if (r < 0)
return r;
}
found = hashmap_get(*cache, user);
if (!found)
return -ESRCH;
*ret_uid = PTR_TO_UID(found);
return 0;
}
int name_to_gid_offline(
const char *root,
const char *group,
gid_t *ret_gid,
Hashmap **cache) {
void *found;
int r;
assert(group);
assert(ret_gid);
assert(cache);
if (!*cache) {
r = populate_gid_cache(root, cache);
if (r < 0)
return r;
}
found = hashmap_get(*cache, group);
if (!found)
return -ESRCH;
*ret_gid = PTR_TO_GID(found);
return 0;
}
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