| /* SPDX-License-Identifier: LGPL-2.1-or-later */ |
| |
| #include <errno.h> |
| #include <stdbool.h> |
| #include <string.h> |
| |
| #include "alloc-util.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 mkdir_safe_internal( |
| const char *path, |
| mode_t mode, |
| uid_t uid, gid_t gid, |
| MkdirFlags flags, |
| mkdir_func_t _mkdir) { |
| |
| struct stat st; |
| int r; |
| |
| assert(path); |
| assert(_mkdir && _mkdir != mkdir); |
| |
| if (_mkdir(path, mode) >= 0) { |
| r = chmod_and_chown(path, mode, uid, gid); |
| if (r < 0) |
| return r; |
| } |
| |
| if (lstat(path, &st) < 0) |
| return -errno; |
| |
| if ((flags & MKDIR_FOLLOW_SYMLINK) && S_ISLNK(st.st_mode)) { |
| _cleanup_free_ char *p = NULL; |
| |
| r = chase_symlinks(path, NULL, CHASE_NONEXISTENT, &p, NULL); |
| if (r < 0) |
| return r; |
| if (r == 0) |
| return mkdir_safe_internal(p, mode, uid, gid, |
| flags & ~MKDIR_FOLLOW_SYMLINK, |
| _mkdir); |
| |
| if (lstat(p, &st) < 0) |
| return -errno; |
| } |
| |
| 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 & 0007) > (mode & 0007) || |
| (st.st_mode & 0070) > (mode & 0070) || |
| (st.st_mode & 0700) > (mode & 0700)) |
| 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 mkdir_errno_wrapper(const char *pathname, mode_t mode) { |
| if (mkdir(pathname, mode) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| int mkdirat_errno_wrapper(int dirfd, const char *pathname, mode_t mode) { |
| if (mkdirat(dirfd, pathname, mode) < 0) |
| return -errno; |
| return 0; |
| } |
| |
| int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags) { |
| return mkdir_safe_internal(path, mode, uid, gid, flags, mkdir_errno_wrapper); |
| } |
| |
| int mkdir_parents_internal(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdir_func_t _mkdir) { |
| const char *p, *e; |
| int r; |
| |
| assert(path); |
| assert(_mkdir != mkdir); |
| |
| if (prefix && !path_startswith(path, prefix)) |
| return -ENOTDIR; |
| |
| /* return immediately if directory exists */ |
| e = strrchr(path, '/'); |
| if (!e) |
| return 0; |
| |
| if (e == path) |
| return 0; |
| |
| p = strndupa(path, e - path); |
| r = is_dir(p, true); |
| if (r > 0) |
| return 0; |
| if (r == 0) |
| return -ENOTDIR; |
| |
| /* create every parent directory in the path, except the last component */ |
| p = path + strspn(path, "/"); |
| for (;;) { |
| char t[strlen(path) + 1]; |
| |
| e = p + strcspn(p, "/"); |
| p = e + strspn(e, "/"); |
| |
| /* Is this the last component? If so, then we're done */ |
| if (*p == 0) |
| return 0; |
| |
| memcpy(t, path, e - path); |
| t[e-path] = 0; |
| |
| if (prefix && path_startswith(prefix, t)) |
| continue; |
| |
| if (!uid_is_valid(uid) && !gid_is_valid(gid) && flags == 0) { |
| r = _mkdir(t, mode); |
| if (r < 0 && r != -EEXIST) |
| return r; |
| } else { |
| r = mkdir_safe_internal(t, mode, uid, gid, flags, _mkdir); |
| if (r < 0 && r != -EEXIST) |
| return r; |
| } |
| } |
| } |
| |
| int mkdir_parents(const char *path, mode_t mode) { |
| return mkdir_parents_internal(NULL, path, mode, UID_INVALID, UID_INVALID, 0, mkdir_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, mkdir_errno_wrapper); |
| } |
| |
| int mkdir_p_internal(const char *prefix, const char *path, mode_t mode, uid_t uid, gid_t gid, MkdirFlags flags, mkdir_func_t _mkdir) { |
| int r; |
| |
| /* Like mkdir -p */ |
| |
| assert(_mkdir != mkdir); |
| |
| r = mkdir_parents_internal(prefix, path, mode, uid, gid, flags, _mkdir); |
| if (r < 0) |
| return r; |
| |
| if (!uid_is_valid(uid) && !gid_is_valid(gid) && flags == 0) { |
| r = _mkdir(path, mode); |
| if (r < 0 && (r != -EEXIST || is_dir(path, true) <= 0)) |
| return r; |
| } else { |
| r = mkdir_safe_internal(path, mode, uid, gid, flags, _mkdir); |
| 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, mkdir_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, mkdir_errno_wrapper); |
| } |
| |
| int mkdir_p_root(const char *root, const char *p, uid_t uid, gid_t gid, mode_t m) { |
| _cleanup_free_ char *pp = NULL; |
| _cleanup_close_ int dfd = -1; |
| const char *bn; |
| int r; |
| |
| pp = dirname_malloc(p); |
| if (!pp) |
| return -ENOMEM; |
| |
| /* Not top-level? */ |
| if (!(path_equal(pp, "/") || isempty(pp) || path_equal(pp, "."))) { |
| |
| /* Recurse up */ |
| r = mkdir_p_root(root, pp, uid, gid, m); |
| if (r < 0) |
| return r; |
| } |
| |
| bn = basename(p); |
| if (path_equal(bn, "/") || isempty(bn) || path_equal(bn, ".")) |
| return 0; |
| |
| if (!filename_is_valid(bn)) |
| return -EINVAL; |
| |
| dfd = chase_symlinks_and_open(pp, root, CHASE_PREFIX_ROOT, O_RDONLY|O_CLOEXEC|O_DIRECTORY, NULL); |
| if (dfd < 0) |
| return dfd; |
| |
| if (mkdirat(dfd, bn, m) < 0) { |
| if (errno == EEXIST) |
| return 0; |
| |
| return -errno; |
| } |
| |
| if (uid_is_valid(uid) || gid_is_valid(gid)) { |
| _cleanup_close_ int nfd = -1; |
| |
| nfd = openat(dfd, bn, O_RDONLY|O_CLOEXEC|O_DIRECTORY); |
| if (nfd < 0) |
| return -errno; |
| |
| if (fchown(nfd, uid, gid) < 0) |
| return -errno; |
| } |
| |
| return 1; |
| } |
