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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#include <errno.h>
#include <stdbool.h>
#include <string.h>
#include "alloc-util.h"
#include "btrfs.h"
#include "chase.h"
#include "fd-util.h"
#include "format-util.h"
#include "fs-util.h"
#include "macro.h"
#include "mkdir.h"
#include "path-util.h"
#include "stat-util.h"
#include "stdio-util.h"
#include "user-util.h"
int mkdirat_safe_internal(
int dir_fd,
const char *path,
mode_t mode,
uid_t uid,
gid_t gid,
MkdirFlags flags,
mkdirat_func_t _mkdirat) {
struct stat st;
int r;
assert(path);
assert(mode != MODE_INVALID);
assert(_mkdirat && _mkdirat != mkdirat);
r = _mkdirat(dir_fd, path, mode);
if (r >= 0)
return chmod_and_chown_at(dir_fd, path, mode, uid, gid);
if (r != -EEXIST)
return r;
if (fstatat(dir_fd, path, &st, AT_SYMLINK_NOFOLLOW) < 0)
return -errno;
if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) {
_cleanup_free_ char *p = NULL;
r = chaseat(dir_fd, path, CHASE_NONEXISTENT, &p, NULL);
if (r < 0)
return r;
if (r == 0)
return mkdirat_safe_internal(dir_fd, p, mode, uid, gid,
flags & ~MKDIR_FOLLOW_SYMLINK,
_mkdirat);
if (fstatat(dir_fd, p, &st, AT_SYMLINK_NOFOLLOW) < 0)
return -errno;
}
if (flags & MKDIR_IGNORE_EXISTING)
return 0;
if (!S_ISDIR(st.st_mode))
return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(ENOTDIR),
"Path \"%s\" already exists and is not a directory, refusing.", path);
if ((st.st_mode & ~mode & 0777) != 0)
return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(EEXIST),
"Directory \"%s\" already exists, but has mode %04o that is too permissive (%04o was requested), refusing.",
path, st.st_mode & 0777, mode);
if ((uid != UID_INVALID && st.st_uid != uid) ||
(gid != GID_INVALID && st.st_gid != gid)) {
char u[DECIMAL_STR_MAX(uid_t)] = "-", g[DECIMAL_STR_MAX(gid_t)] = "-";
if (uid != UID_INVALID)
xsprintf(u, UID_FMT, uid);
if (gid != UID_INVALID)
xsprintf(g, GID_FMT, gid);
return log_full_errno(flags & MKDIR_WARN_MODE ? LOG_WARNING : LOG_DEBUG, SYNTHETIC_ERRNO(EEXIST),
"Directory \"%s\" already exists, but is owned by "UID_FMT":"GID_FMT" (%s:%s was requested), refusing.",
path, st.st_uid, st.st_gid, u, g);
}
return 0;
}
int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) {
return RET_NERRNO(mkdirat(dirfd, pathname, mode));
}
int mkdirat_safe(int dir_fd, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
return mkdirat_safe_internal(dir_fd, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}
int mkdirat_parents_internal(int dir_fd, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {
const char *e = NULL;
int r;
assert(path);
assert(_mkdirat != mkdirat);
if (isempty(path))
return 0;
if (!path_is_safe(path))
return -ENOTDIR;
/* return immediately if directory exists */
r = path_find_last_component(path, /* accept_dot_dot= */ false, &e, NULL);
if (r <= 0) /* r == 0 means path is equivalent to prefix. */
return r;
if (e == path)
return 0;
assert(e > path);
assert(*e == '/');
/* drop the last component */
path = strndupa_safe(path, e - path);
r = is_dir_full(dir_fd, path, true);
if (r > 0)
return 0;
if (r == 0)
return -ENOTDIR;
/* create every parent directory in the path, except the last component */
for (const char *p = path;;) {
char *s;
int n;
n = path_find_first_component(&p, /* accept_dot_dot= */ false, (const char **) &s);
if (n <= 0)
return n;
assert(p);
assert(s >= path);
assert(IN_SET(s[n], '/', '\0'));
s[n] = '\0';
r = mkdirat_safe_internal(dir_fd, path, mode, uid, gid, flags | MKDIR_IGNORE_EXISTING, _mkdirat);
if (r < 0 && r != -EEXIST)
return r;
s[n] = *p == '\0' ? '\0' : '/';
}
}
int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {
_cleanup_close_ int fd = AT_FDCWD;
const char *p;
assert(path);
assert(_mkdirat != mkdirat);
if (prefix) {
p = path_startswith_full(path, prefix, /* accept_dot_dot= */ false);
if (!p)
return -ENOTDIR;
} else
p = path;
if (prefix) {
fd = open(prefix, O_PATH|O_DIRECTORY|O_CLOEXEC);
if (fd < 0)
return -errno;
}
return mkdirat_parents_internal(fd, p, mode, uid, gid, flags, _mkdirat);
}
int mkdirat_parents(int dir_fd, const char *path, mode_t mode) {
return mkdirat_parents_internal(dir_fd, path, mode, UID_INVALID, UID_INVALID, 0, mkdirat_errno_wrapper);
}
int mkdir_parents_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
return mkdir_parents_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}
int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdirat_func_t _mkdirat) {
int r;
/* Like mkdir -p */
assert(_mkdirat != mkdirat);
r = mkdir_parents_internal(prefix, path, mode, uid, gid, flags | MKDIR_FOLLOW_SYMLINK, _mkdirat);
if (r < 0)
return r;
if (!uid_is_valid(uid) && !gid_is_valid(gid) && flags == 0) {
r = _mkdirat(AT_FDCWD, path, mode);
if (r < 0 && (r != -EEXIST || is_dir(path, true) <= 0))
return r;
} else {
r = mkdir_safe_internal(path, mode, uid, gid, flags, _mkdirat);
if (r < 0 && r != -EEXIST)
return r;
}
return 0;
}
int mkdir_p(const char *path, mode_t mode) {
return mkdir_p_internal(NULL, path, mode, UID_INVALID, UID_INVALID, 0, mkdirat_errno_wrapper);
}
int mkdir_p_safe(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) {
return mkdir_p_internal(prefix, path, mode, uid, gid, flags, mkdirat_errno_wrapper);
}
int mkdir_p_root(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m, char **subvolumes) {
_cleanup_free_ char *pp = NULL, *bn = NULL;
_cleanup_close_ int dfd = -EBADF;
int r;
r = path_extract_directory(p, &pp);
if (r == -EDESTADDRREQ) {
/* only fname is passed, no prefix to operate on */
dfd = open(".", O_RDONLY|O_CLOEXEC|O_DIRECTORY);
if (dfd < 0)
return -errno;
} else if (r == -EADDRNOTAVAIL)
/* only root dir or "." was passed, i.e. there is no parent to extract, in that case there's nothing to do. */
return 0;
else if (r < 0)
return r;
else {
/* Extracting the parent dir worked, hence we aren't top-level? Recurse up first. */
r = mkdir_p_root(root, pp, uid, gid, m, subvolumes);
if (r < 0)
return r;
dfd = chase_and_open(pp, root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_DIRECTORY, NULL);
if (dfd < 0)
return dfd;
}
r = path_extract_filename(p, &bn);
if (r == -EADDRNOTAVAIL) /* Already top-level */
return 0;
if (r < 0)
return r;
if (path_strv_contains(subvolumes, p))
r = btrfs_subvol_make_fallback(dfd, bn, m);
else
r = RET_NERRNO(mkdirat(dfd, bn, m));
if (r < 0) {
if (r == -EEXIST)
return 0;
return r;
}
if (uid_is_valid(uid) || gid_is_valid(gid)) {
_cleanup_close_ int nfd = -EBADF;
nfd = openat(dfd, bn, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOFOLLOW);
if (nfd < 0)
return -errno;
if (fchown(nfd, uid, gid) < 0)
return -errno;
}
return 1;
}
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