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-rw-r--r--src/shared/offline-passwd.c164
1 files changed, 164 insertions, 0 deletions
diff --git a/src/shared/offline-passwd.c b/src/shared/offline-passwd.c
new file mode 100644
index 0000000..b607aac
--- /dev/null
+++ b/src/shared/offline-passwd.c
@@ -0,0 +1,164 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include "fd-util.h"
+#include "fs-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;
+ _cleanup_close_ int fd = -1;
+
+ 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);
+
+ log_debug("Reading %s entries from %s...", basename(fname), 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. */
+
+ const char *fname;
+ 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;
+
+ const char *fname;
+ 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;
+}