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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 15:35:18 +0000 |
commit | b750101eb236130cf056c675997decbac904cc49 (patch) | |
tree | a5df1a06754bdd014cb975c051c83b01c9a97532 /src/tmpfiles/offline-passwd.c | |
parent | Initial commit. (diff) | |
download | systemd-upstream.tar.xz systemd-upstream.zip |
Adding upstream version 252.22.upstream/252.22upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r-- | src/tmpfiles/offline-passwd.c | 162 |
1 files changed, 162 insertions, 0 deletions
diff --git a/src/tmpfiles/offline-passwd.c b/src/tmpfiles/offline-passwd.c new file mode 100644 index 0000000..c847266 --- /dev/null +++ b/src/tmpfiles/offline-passwd.c @@ -0,0 +1,162 @@ +/* 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; + _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. */ + + 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; +} |