diff options
Diffstat (limited to 'src/basic/fs-util.c')
| -rw-r--r-- | src/basic/fs-util.c | 46 |
1 files changed, 46 insertions, 0 deletions
diff --git a/src/basic/fs-util.c b/src/basic/fs-util.c index f8095e85d8..558cafbcaf 100644 --- a/src/basic/fs-util.c +++ b/src/basic/fs-util.c @@ -272,6 +272,52 @@ int fchmod_and_chown(int fd, mode_t mode, uid_t uid, gid_t gid) { return do_chown || do_chmod; } +int chmod_and_chown_unsafe(const char *path, mode_t mode, uid_t uid, gid_t gid) { + bool do_chown, do_chmod; + struct stat st; + + assert(path); + + /* Change ownership and access mode of the specified path, see description of fchmod_and_chown(). + * Should only be used on trusted paths. */ + + if (lstat(path, &st) < 0) + return -errno; + + do_chown = + (uid != UID_INVALID && st.st_uid != uid) || + (gid != GID_INVALID && st.st_gid != gid); + + do_chmod = + !S_ISLNK(st.st_mode) && /* chmod is not defined on symlinks */ + ((mode != MODE_INVALID && ((st.st_mode ^ mode) & 07777) != 0) || + do_chown); /* If we change ownership, make sure we reset the mode afterwards, since chown() + * modifies the access mode too */ + + if (mode == MODE_INVALID) + mode = st.st_mode; /* If we only shall do a chown(), save original mode, since chown() might break it. */ + else if ((mode & S_IFMT) != 0 && ((mode ^ st.st_mode) & S_IFMT) != 0) + return -EINVAL; /* insist on the right file type if it was specified */ + + if (do_chown && do_chmod) { + mode_t minimal = st.st_mode & mode; /* the subset of the old and the new mask */ + + if (((minimal ^ st.st_mode) & 07777) != 0) + if (chmod(path, minimal & 07777) < 0) + return -errno; + } + + if (do_chown) + if (lchown(path, uid, gid) < 0) + return -errno; + + if (do_chmod) + if (chmod(path, mode & 07777) < 0) + return -errno; + + return do_chown || do_chmod; +} + int fchmod_umask(int fd, mode_t m) { mode_t u; int r; |