More cleanup work on permissions restore:
* Rename some variables/functions/etc to try to make things clearer.
* Add separate flags to control fflag/acl restore
* Collect metadata restore into a single function for clarity
* Propagate errors in metadata restore back out to the client
* Fix some places where errors were being returned when they
shouldn't and vice-versa
* Modes are now always restored; ARCHIVE_EXTRACT_PERM just controls
whether or not umask is obeyed.
* Restore suid/sgid bits only if user/group matches archive
* Cache the last stat results to try to reduce the number of stat calls
This commit is contained in:
Tim Kientzle
parent
4660ecd1dc
commit
b5f1f87711
@ -208,6 +208,8 @@ int archive_read_data_into_fd(struct archive *, int fd);
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#define ARCHIVE_EXTRACT_TIME (4) /* Default: mod time not restored */
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#define ARCHIVE_EXTRACT_NO_OVERWRITE (8) /* Default: Replace files on disk */
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#define ARCHIVE_EXTRACT_UNLINK (16) /* Default: don't unlink existing files */
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#define ARCHIVE_EXTRACT_ACL (32) /* Default: don't restore ACLs */
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#define ARCHIVE_EXTRACT_FFLAGS (64) /* Default: don't restore fflags */
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int archive_read_extract(struct archive *, struct archive_entry *,
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int flags);
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@ -208,6 +208,8 @@ int archive_read_data_into_fd(struct archive *, int fd);
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#define ARCHIVE_EXTRACT_TIME (4) /* Default: mod time not restored */
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#define ARCHIVE_EXTRACT_NO_OVERWRITE (8) /* Default: Replace files on disk */
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#define ARCHIVE_EXTRACT_UNLINK (16) /* Default: don't unlink existing files */
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#define ARCHIVE_EXTRACT_ACL (32) /* Default: don't restore ACLs */
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#define ARCHIVE_EXTRACT_FFLAGS (64) /* Default: don't restore fflags */
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int archive_read_extract(struct archive *, struct archive_entry *,
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int flags);
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@ -73,9 +73,20 @@ struct extract {
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mode_t umask;
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struct archive_string mkdirpath;
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struct fixup_entry *fixup_list;
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/*
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* Cached stat data from disk for the current entry.
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* If this is valid, pst points to st. Otherwise,
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* pst is null.
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*
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* TODO: Have all of the stat calls use this cached data
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* if possible.
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*/
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struct stat st;
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struct stat *pst;
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};
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/* Default mode for dirs created automatically. */
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/* Default mode for dirs created automatically (will be modified by umask). */
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#define DEFAULT_DIR_MODE 0777
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/*
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* Mode to use for newly-created dirs during extraction; the correct
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@ -84,34 +95,29 @@ struct extract {
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#define SECURE_DIR_MODE 0700
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static void archive_extract_cleanup(struct archive *);
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static int archive_read_extract_block_device(struct archive *,
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static int extract_block_device(struct archive *,
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struct archive_entry *, int);
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static int archive_read_extract_char_device(struct archive *,
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static int extract_char_device(struct archive *,
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struct archive_entry *, int);
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static int archive_read_extract_device(struct archive *,
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static int extract_device(struct archive *,
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struct archive_entry *, int flags, mode_t mode);
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static int archive_read_extract_dir(struct archive *,
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struct archive_entry *, int);
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static int archive_read_extract_fifo(struct archive *,
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struct archive_entry *, int);
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static int archive_read_extract_hard_link(struct archive *,
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struct archive_entry *, int);
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static int archive_read_extract_regular(struct archive *,
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struct archive_entry *, int);
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static int archive_read_extract_symbolic_link(struct archive *,
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struct archive_entry *, int);
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static int extract_dir(struct archive *, struct archive_entry *, int);
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static int extract_fifo(struct archive *, struct archive_entry *, int);
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static int extract_file(struct archive *, struct archive_entry *, int);
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static int extract_hard_link(struct archive *, struct archive_entry *, int);
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static int extract_symlink(struct archive *, struct archive_entry *, int);
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static gid_t lookup_gid(struct archive *, const char *uname, gid_t);
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static uid_t lookup_uid(struct archive *, const char *uname, uid_t);
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static int mkdirpath(struct archive *, const char *);
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static int mkdirpath_recursive(struct archive *, char *,
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const struct stat *, mode_t, int);
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static int restore_metadata(struct archive *, struct archive_entry *,
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int flags);
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#ifdef HAVE_POSIX_ACL
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static int set_acl(struct archive *, struct archive_entry *,
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acl_type_t, int archive_entry_acl_type, const char *tn);
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#endif
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static int set_acls(struct archive *, struct archive_entry *);
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static int set_extended_perm(struct archive *, struct archive_entry *,
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int flags);
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static int set_fflags(struct archive *, const char *name, mode_t mode,
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unsigned long fflags_set, unsigned long fflags_clear);
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static int set_ownership(struct archive *, struct archive_entry *, int);
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@ -151,12 +157,9 @@ archive_read_extract(struct archive *a, struct archive_entry *entry, int flags)
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}
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extract = a->extract;
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umask(extract->umask = umask(0)); /* Read the current umask. */
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extract->pst = NULL;
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restore_pwd = -1;
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if (archive_entry_hardlink(entry) != NULL)
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return (archive_read_extract_hard_link(a, entry, flags));
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/*
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* TODO: If pathname is longer than PATH_MAX, record starting
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* directory and move to a suitable intermediate dir, which
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@ -168,29 +171,41 @@ archive_read_extract(struct archive *a, struct archive_entry *entry, int flags)
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/* XXX Update pathname in 'entry' XXX */
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}
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if (stat(archive_entry_pathname(entry), &extract->st) == 0)
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extract->pst = &extract->st;
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if (extract->pst != NULL &&
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extract->pst->st_dev == a->skip_file_dev &&
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extract->pst->st_ino == a->skip_file_ino) {
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archive_set_error(a, 0, "Refusing to overwrite archive");
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ret = ARCHIVE_WARN;
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} else if (archive_entry_hardlink(entry) != NULL)
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ret = extract_hard_link(a, entry, flags);
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else {
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mode = archive_entry_mode(entry);
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switch (mode & S_IFMT) {
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default:
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/* Fall through, as required by POSIX. */
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case S_IFREG:
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ret = archive_read_extract_regular(a, entry, flags);
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ret = extract_file(a, entry, flags);
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break;
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case S_IFLNK: /* Symlink */
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ret = archive_read_extract_symbolic_link(a, entry, flags);
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ret = extract_symlink(a, entry, flags);
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break;
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case S_IFCHR:
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ret = archive_read_extract_char_device(a, entry, flags);
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ret = extract_char_device(a, entry, flags);
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break;
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case S_IFBLK:
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ret = archive_read_extract_block_device(a, entry, flags);
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ret = extract_block_device(a, entry, flags);
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break;
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case S_IFDIR:
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ret = archive_read_extract_dir(a, entry, flags);
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ret = extract_dir(a, entry, flags);
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break;
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case S_IFIFO:
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ret = archive_read_extract_fifo(a, entry, flags);
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ret = extract_fifo(a, entry, flags);
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break;
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}
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}
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/* If we changed directory above, restore it here. */
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if (restore_pwd >= 0)
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@ -218,8 +233,8 @@ archive_read_extract(struct archive *a, struct archive_entry *entry, int flags)
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* name from archive_read_finish) reduces static link pollution, since
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* applications that don't use this API won't get this file linked in.
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*/
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static
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void archive_extract_cleanup(struct archive *a)
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static void
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archive_extract_cleanup(struct archive *a)
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{
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struct fixup_entry *next, *p;
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struct extract *extract;
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@ -320,15 +335,16 @@ sort_dir_list(struct fixup_entry *p)
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}
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static int
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archive_read_extract_regular(struct archive *a, struct archive_entry *entry,
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int flags)
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extract_file(struct archive *a, struct archive_entry *entry, int flags)
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{
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struct extract *extract;
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const char *name;
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mode_t mode;
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int fd, r;
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int fd, r, r2;
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extract = a->extract;
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name = archive_entry_pathname(entry);
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mode = archive_entry_mode(entry);
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mode = archive_entry_mode(entry) & 0777;
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r = ARCHIVE_OK;
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/*
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@ -356,31 +372,25 @@ archive_read_extract_regular(struct archive *a, struct archive_entry *entry,
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return (ARCHIVE_WARN);
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}
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r = archive_read_data_into_fd(a, fd);
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set_ownership(a, entry, flags);
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set_time(a, entry, flags);
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/* Always reset permissions for regular files. */
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set_perm(a, entry, archive_entry_mode(entry),
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flags | ARCHIVE_EXTRACT_PERM);
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set_extended_perm(a, entry, flags);
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extract->pst = NULL; /* Cached stat data no longer valid. */
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r2 = restore_metadata(a, entry, flags);
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close(fd);
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return (r);
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return (err_combine(r, r2));
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}
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static int
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archive_read_extract_dir(struct archive *a, struct archive_entry *entry,
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int flags)
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extract_dir(struct archive *a, struct archive_entry *entry, int flags)
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{
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struct extract *extract;
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const struct stat *st;
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char *p;
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int ret, ret2;
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size_t len;
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extract = a->extract;
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st = archive_entry_stat(entry);
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/* Copy path to mutable storage. */
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archive_strcpy(&(extract->mkdirpath), archive_entry_pathname(entry));
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archive_strcpy(&(extract->mkdirpath),
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archive_entry_pathname(entry));
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p = extract->mkdirpath.s;
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len = strlen(p);
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if (len > 2 && p[len - 1] == '.' && p[len - 2] == '/')
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@ -388,12 +398,12 @@ archive_read_extract_dir(struct archive *a, struct archive_entry *entry,
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if (len > 2 && p[len - 1] == '/')
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p[--len] = '\0'; /* Remove trailing "/" */
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/* Recursively try to build the path. */
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st = archive_entry_stat(entry);
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extract->pst = NULL; /* Invalidate cached stat data. */
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if (mkdirpath_recursive(a, p, st, st->st_mode, flags))
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return (ARCHIVE_WARN);
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set_ownership(a, entry, flags);
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ret = set_perm(a, entry, 0700, flags);
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ret2 = set_extended_perm(a, entry, flags);
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return (err_combine(ret, ret2));
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archive_entry_set_mode(entry, 0700);
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return (restore_metadata(a, entry, flags));
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}
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@ -428,10 +438,10 @@ mkdirpath(struct archive *a, const char *path)
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* Otherwise, returns ARCHIVE_WARN.
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*/
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static int
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mkdirpath_recursive(struct archive *a, char *path, const struct stat *st,
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mode_t mode, int flags)
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mkdirpath_recursive(struct archive *a, char *path,
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const struct stat *desired_stat, mode_t mode, int flags)
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{
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struct stat sb;
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struct stat st;
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struct extract *extract;
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struct fixup_entry *le;
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char *p;
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@ -444,7 +454,7 @@ mkdirpath_recursive(struct archive *a, char *path, const struct stat *st,
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return (ARCHIVE_OK);
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if (mode != writable_mode ||
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(st != NULL && (flags & ARCHIVE_EXTRACT_TIME))) {
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(desired_stat != NULL && (flags & ARCHIVE_EXTRACT_TIME))) {
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/* Add this dir to the fixup list. */
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le = malloc(sizeof(struct fixup_entry));
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le->fixup = 0;
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@ -458,10 +468,10 @@ mkdirpath_recursive(struct archive *a, char *path, const struct stat *st,
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mode = writable_mode;
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}
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if (flags & ARCHIVE_EXTRACT_TIME) {
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le->mtime = st->st_mtime;
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le->mtime_nanos = ARCHIVE_STAT_MTIME_NANOS(st);
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le->atime = st->st_atime;
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le->atime_nanos = ARCHIVE_STAT_ATIME_NANOS(st);
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le->mtime = desired_stat->st_mtime;
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le->mtime_nanos = ARCHIVE_STAT_MTIME_NANOS(desired_stat);
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le->atime = desired_stat->st_atime;
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le->atime_nanos = ARCHIVE_STAT_ATIME_NANOS(desired_stat);
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le->fixup |= FIXUP_TIMES;
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}
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}
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@ -486,10 +496,12 @@ mkdirpath_recursive(struct archive *a, char *path, const struct stat *st,
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* here loses the ability to extract through symlinks. If
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* clients don't want to extract through symlinks, they should
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* specify ARCHIVE_EXTRACT_UNLINK.
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*
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* Note that this cannot use the extract->st cache.
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*/
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if (stat(path, &sb) == 0) {
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if (stat(path, &st) == 0) {
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/* Already exists! */
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if (S_ISDIR(sb.st_mode))
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if (S_ISDIR(st.st_mode))
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return (ARCHIVE_OK);
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if ((flags & ARCHIVE_EXTRACT_NO_OVERWRITE)) {
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archive_set_error(a, EEXIST,
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@ -529,7 +541,7 @@ mkdirpath_recursive(struct archive *a, char *path, const struct stat *st,
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* Without the following check, a/b/../b/c/d fails at
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* the second visit to 'b', so 'd' can't be created.
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*/
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if (stat(path, &sb) == 0 && S_ISDIR(sb.st_mode))
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if (stat(path, &st) == 0 && S_ISDIR(st.st_mode))
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return (ARCHIVE_OK);
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}
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archive_set_error(a, errno, "Failed to create dir '%s'", path);
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@ -537,13 +549,14 @@ mkdirpath_recursive(struct archive *a, char *path, const struct stat *st,
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}
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static int
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archive_read_extract_hard_link(struct archive *a, struct archive_entry *entry,
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int flags)
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extract_hard_link(struct archive *a, struct archive_entry *entry, int flags)
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{
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struct extract *extract;
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int r;
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const char *pathname;
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const char *linkname;
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extract = a->extract;
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pathname = archive_entry_pathname(entry);
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linkname = archive_entry_hardlink(entry);
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@ -552,6 +565,7 @@ archive_read_extract_hard_link(struct archive *a, struct archive_entry *entry,
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unlink(pathname);
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r = link(linkname, pathname);
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extract->pst = NULL; /* Invalidate cached stat data. */
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if (r != 0) {
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/* Might be a non-existent parent dir; try fixing that. */
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@ -567,22 +581,19 @@ archive_read_extract_hard_link(struct archive *a, struct archive_entry *entry,
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}
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/* Set ownership, time, permission information. */
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set_ownership(a, entry, flags);
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set_time(a, entry, flags);
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set_perm(a, entry, archive_entry_stat(entry)->st_mode, flags);
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set_extended_perm(a, entry, flags);
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return (ARCHIVE_OK);
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r = restore_metadata(a, entry, flags);
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return (r);
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}
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static int
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archive_read_extract_symbolic_link(struct archive *a,
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struct archive_entry *entry, int flags)
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extract_symlink(struct archive *a, struct archive_entry *entry, int flags)
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{
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struct extract *extract;
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int r;
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const char *pathname;
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const char *linkname;
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extract = a->extract;
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pathname = archive_entry_pathname(entry);
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linkname = archive_entry_symlink(entry);
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@ -591,6 +602,7 @@ archive_read_extract_symbolic_link(struct archive *a,
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unlink(pathname);
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r = symlink(linkname, pathname);
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extract->pst = NULL; /* Invalidate cached stat data. */
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if (r != 0) {
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/* Might be a non-existent parent dir; try fixing that. */
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@ -605,27 +617,25 @@ archive_read_extract_symbolic_link(struct archive *a,
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return (ARCHIVE_WARN);
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}
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/* Set ownership, time, permission information. */
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set_ownership(a, entry, flags);
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set_time(a, entry, flags);
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set_perm(a, entry, archive_entry_stat(entry)->st_mode, flags);
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set_extended_perm(a, entry, flags);
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return (ARCHIVE_OK);
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r = restore_metadata(a, entry, flags);
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return (r);
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}
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static int
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archive_read_extract_device(struct archive *a, struct archive_entry *entry,
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extract_device(struct archive *a, struct archive_entry *entry,
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int flags, mode_t mode)
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{
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struct extract *extract;
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int r;
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extract = a->extract;
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/* Just remove any pre-existing file with this name. */
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if (!(flags & ARCHIVE_EXTRACT_NO_OVERWRITE))
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unlink(archive_entry_pathname(entry));
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r = mknod(archive_entry_pathname(entry), mode,
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archive_entry_rdev(entry));
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extract->pst = NULL; /* Invalidate cached stat data. */
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/* Might be a non-existent parent dir; try fixing that. */
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if (r != 0 && errno == ENOENT) {
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@ -635,57 +645,52 @@ archive_read_extract_device(struct archive *a, struct archive_entry *entry,
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}
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if (r != 0) {
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archive_set_error(a, errno, "Can't recreate device node");
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archive_set_error(a, errno, "Can't restore device node");
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return (ARCHIVE_WARN);
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}
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/* Set ownership, time, permission information. */
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set_ownership(a, entry, flags);
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set_time(a, entry, flags);
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set_perm(a, entry, archive_entry_stat(entry)->st_mode, flags);
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set_extended_perm(a, entry, flags);
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return (ARCHIVE_OK);
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r = restore_metadata(a, entry, flags);
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return (r);
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}
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static int
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archive_read_extract_char_device(struct archive *a,
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struct archive_entry *entry, int flags)
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extract_char_device(struct archive *a, struct archive_entry *entry, int flags)
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{
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mode_t mode;
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||||
mode = (archive_entry_mode(entry) & ~S_IFMT) | S_IFCHR;
|
||||
return (archive_read_extract_device(a, entry, flags, mode));
|
||||
return (extract_device(a, entry, flags, mode));
|
||||
}
|
||||
|
||||
static int
|
||||
archive_read_extract_block_device(struct archive *a,
|
||||
struct archive_entry *entry, int flags)
|
||||
extract_block_device(struct archive *a, struct archive_entry *entry, int flags)
|
||||
{
|
||||
mode_t mode;
|
||||
|
||||
mode = (archive_entry_mode(entry) & ~S_IFMT) | S_IFBLK;
|
||||
return (archive_read_extract_device(a, entry, flags, mode));
|
||||
return (extract_device(a, entry, flags, mode));
|
||||
}
|
||||
|
||||
static int
|
||||
archive_read_extract_fifo(struct archive *a,
|
||||
struct archive_entry *entry, int flags)
|
||||
extract_fifo(struct archive *a, struct archive_entry *entry, int flags)
|
||||
{
|
||||
struct extract *extract;
|
||||
int r;
|
||||
|
||||
extract = a->extract;
|
||||
/* Just remove any pre-existing file with this name. */
|
||||
if (!(flags & ARCHIVE_EXTRACT_NO_OVERWRITE))
|
||||
unlink(archive_entry_pathname(entry));
|
||||
|
||||
r = mkfifo(archive_entry_pathname(entry),
|
||||
archive_entry_stat(entry)->st_mode);
|
||||
archive_entry_mode(entry));
|
||||
extract->pst = NULL; /* Invalidate cached stat data. */
|
||||
|
||||
/* Might be a non-existent parent dir; try fixing that. */
|
||||
if (r != 0 && errno == ENOENT) {
|
||||
mkdirpath(a, archive_entry_pathname(entry));
|
||||
r = mkfifo(archive_entry_pathname(entry),
|
||||
archive_entry_stat(entry)->st_mode);
|
||||
archive_entry_mode(entry));
|
||||
}
|
||||
|
||||
if (r != 0) {
|
||||
@ -693,19 +698,22 @@ archive_read_extract_fifo(struct archive *a,
|
||||
return (ARCHIVE_WARN);
|
||||
}
|
||||
|
||||
/* Set ownership, time, permission information. */
|
||||
set_ownership(a, entry, flags);
|
||||
set_time(a, entry, flags);
|
||||
/* Done by mkfifo. */
|
||||
/* set_perm(a, entry, archive_entry_stat(entry)->st_mode, flags); */
|
||||
set_extended_perm(a, entry, flags);
|
||||
|
||||
return (ARCHIVE_OK);
|
||||
r = restore_metadata(a, entry, flags);
|
||||
return (r);
|
||||
}
|
||||
|
||||
static int
|
||||
restore_metadata(struct archive *a, struct archive_entry *entry, int flags)
|
||||
{
|
||||
int r, r2;
|
||||
|
||||
r = set_ownership(a, entry, flags);
|
||||
r2 = set_time(a, entry, flags);
|
||||
r = err_combine(r, r2);
|
||||
r2 = set_perm(a, entry, archive_entry_mode(entry), flags);
|
||||
return (err_combine(r, r2));
|
||||
}
|
||||
|
||||
/*
|
||||
* Returns 0 if UID/GID successfully restored; ARCHIVE_WARN otherwise.
|
||||
*/
|
||||
static int
|
||||
set_ownership(struct archive *a, struct archive_entry *entry, int flags)
|
||||
{
|
||||
@ -714,21 +722,16 @@ set_ownership(struct archive *a, struct archive_entry *entry, int flags)
|
||||
|
||||
/* Not changed. */
|
||||
if ((flags & ARCHIVE_EXTRACT_OWNER) == 0)
|
||||
return (ARCHIVE_WARN);
|
||||
return (ARCHIVE_OK);
|
||||
|
||||
uid = lookup_uid(a, archive_entry_uname(entry),
|
||||
archive_entry_stat(entry)->st_uid);
|
||||
archive_entry_uid(entry));
|
||||
gid = lookup_gid(a, archive_entry_gname(entry),
|
||||
archive_entry_stat(entry)->st_gid);
|
||||
archive_entry_gid(entry));
|
||||
|
||||
/*
|
||||
* Root can change owner/group; owner can change group;
|
||||
* otherwise, bail out now.
|
||||
*/
|
||||
if (a->user_uid != 0 && a->user_uid != uid) {
|
||||
/* XXXX archive_set_error( XXXX ) ; XXX */
|
||||
return (ARCHIVE_WARN);
|
||||
}
|
||||
/* If we know we can't change it, don't bother trying. */
|
||||
if (a->user_uid != 0 && a->user_uid != uid)
|
||||
return (ARCHIVE_OK);
|
||||
|
||||
if (lchown(archive_entry_pathname(entry), uid, gid)) {
|
||||
archive_set_error(a, errno,
|
||||
@ -750,6 +753,9 @@ set_time(struct archive *a, struct archive_entry *entry, int flags)
|
||||
|
||||
if ((flags & ARCHIVE_EXTRACT_TIME) == 0)
|
||||
return (ARCHIVE_OK);
|
||||
/* It's a waste of time to mess with dir timestamps here. */
|
||||
if (S_ISDIR(archive_entry_mode(entry)))
|
||||
return (ARCHIVE_OK);
|
||||
|
||||
times[1].tv_sec = st->st_mtime;
|
||||
times[1].tv_usec = ARCHIVE_STAT_MTIME_NANOS(st) / 1000;
|
||||
@ -783,14 +789,35 @@ static int
|
||||
set_perm(struct archive *a, struct archive_entry *entry, int mode, int flags)
|
||||
{
|
||||
struct extract *extract;
|
||||
struct fixup_entry *le;
|
||||
const char *name;
|
||||
|
||||
if ((flags & ARCHIVE_EXTRACT_PERM) == 0)
|
||||
return (ARCHIVE_OK);
|
||||
unsigned long set, clear;
|
||||
int r;
|
||||
int critical_flags;
|
||||
|
||||
extract = a->extract;
|
||||
|
||||
/* Obey umask unless ARCHIVE_EXTRACT_PERM. */
|
||||
if ((flags & ARCHIVE_EXTRACT_PERM) == 0)
|
||||
mode &= ~extract->umask; /* Enforce umask. */
|
||||
name = archive_entry_pathname(entry);
|
||||
|
||||
if (mode & (S_ISUID | S_ISGID)) {
|
||||
if (extract->pst == NULL && stat(name, &extract->st) != 0) {
|
||||
archive_set_error(a, errno, "Can't check ownership");
|
||||
return (ARCHIVE_WARN);
|
||||
}
|
||||
extract->pst = &extract->st;
|
||||
/*
|
||||
* TODO: Use the uid/gid looked up in set_ownership
|
||||
* above rather than the uid/gid stored in the entry.
|
||||
*/
|
||||
if (extract->pst->st_uid != archive_entry_uid(entry))
|
||||
mode &= ~ S_ISUID;
|
||||
if (extract->pst->st_gid != archive_entry_gid(entry))
|
||||
mode &= ~ S_ISGID;
|
||||
}
|
||||
|
||||
#ifdef HAVE_LCHMOD
|
||||
if (lchmod(name, mode) != 0) {
|
||||
#else
|
||||
@ -800,19 +827,12 @@ set_perm(struct archive *a, struct archive_entry *entry, int mode, int flags)
|
||||
archive_set_error(a, errno, "Can't set permissions");
|
||||
return (ARCHIVE_WARN);
|
||||
}
|
||||
return (0);
|
||||
}
|
||||
|
||||
static int
|
||||
set_extended_perm(struct archive *a, struct archive_entry *entry, int flags)
|
||||
{
|
||||
struct fixup_entry *le;
|
||||
struct extract *extract;
|
||||
unsigned long set, clear;
|
||||
int ret, ret2;
|
||||
int critical_flags;
|
||||
|
||||
extract = a->extract;
|
||||
if (flags & ARCHIVE_EXTRACT_ACL) {
|
||||
r = set_acls(a, entry);
|
||||
if (r != ARCHIVE_OK)
|
||||
return (r);
|
||||
}
|
||||
|
||||
/*
|
||||
* Make 'critical_flags' hold all file flags that can't be
|
||||
@ -822,8 +842,9 @@ set_extended_perm(struct archive *a, struct archive_entry *entry, int flags)
|
||||
* preserve some semblance of portability, this uses #ifdef
|
||||
* extensively. Ugly, but it works.
|
||||
*
|
||||
* Yes, Virginia, this does create a barn-door-sized security
|
||||
* race. If you see any way to avoid it, please let me know.
|
||||
* Yes, Virginia, this does create a security race. It's mitigated
|
||||
* somewhat by the practice of creating dirs 0700 until the extract
|
||||
* is done, but it would be nice if we could do more than that.
|
||||
* People restoring critical file systems should be wary of
|
||||
* other programs that might try to muck with files as they're
|
||||
* being restored.
|
||||
@ -849,14 +870,12 @@ set_extended_perm(struct archive *a, struct archive_entry *entry, int flags)
|
||||
critical_flags |= EXT2_IMMUTABLE_FL;
|
||||
#endif
|
||||
|
||||
if ((flags & ARCHIVE_EXTRACT_PERM) == 0)
|
||||
return (ARCHIVE_OK);
|
||||
|
||||
if (flags & ARCHIVE_EXTRACT_FFLAGS) {
|
||||
archive_entry_fflags(entry, &set, &clear);
|
||||
|
||||
/*
|
||||
* The first test encourages the compiler to eliminate all of
|
||||
* this if it's not necessary.
|
||||
* The first test encourages the compiler to eliminate
|
||||
* all of this if it's not necessary.
|
||||
*/
|
||||
if ((critical_flags != 0) && (set & critical_flags)) {
|
||||
le = malloc(sizeof(struct fixup_entry));
|
||||
@ -866,28 +885,29 @@ set_extended_perm(struct archive *a, struct archive_entry *entry, int flags)
|
||||
le->name = strdup(archive_entry_pathname(entry));
|
||||
le->mode = archive_entry_mode(entry);
|
||||
le->fflags_set = set;
|
||||
ret = ARCHIVE_OK;
|
||||
} else
|
||||
ret = set_fflags(a, archive_entry_pathname(entry),
|
||||
} else {
|
||||
r = set_fflags(a, archive_entry_pathname(entry),
|
||||
archive_entry_mode(entry), set, clear);
|
||||
|
||||
ret2 = set_acls(a, entry);
|
||||
|
||||
return (err_combine(ret,ret2));
|
||||
if (r != ARCHIVE_OK)
|
||||
return (r);
|
||||
}
|
||||
}
|
||||
return (ARCHIVE_OK);
|
||||
}
|
||||
|
||||
static int
|
||||
set_fflags(struct archive *a, const char *name, mode_t mode,
|
||||
unsigned long set, unsigned long clear)
|
||||
{
|
||||
struct extract *extract;
|
||||
int ret;
|
||||
struct stat st;
|
||||
#ifdef LINUX
|
||||
int fd;
|
||||
int err;
|
||||
unsigned long newflags, oldflags;
|
||||
#endif
|
||||
|
||||
extract = a->extract;
|
||||
ret = ARCHIVE_OK;
|
||||
if (set == 0 && clear == 0)
|
||||
return (ret);
|
||||
@ -900,14 +920,15 @@ set_fflags(struct archive *a, const char *name, mode_t mode,
|
||||
* about the correct approach if we're overwriting an existing
|
||||
* file that already has flags on it. XXX
|
||||
*/
|
||||
if (stat(name, &st) == 0) {
|
||||
st.st_flags &= ~clear;
|
||||
st.st_flags |= set;
|
||||
if (chflags(name, st.st_flags) != 0) {
|
||||
if (stat(name, &extract->st) == 0) {
|
||||
extract->st.st_flags &= ~clear;
|
||||
extract->st.st_flags |= set;
|
||||
if (chflags(name, extract->pst->st_flags) != 0) {
|
||||
archive_set_error(a, errno,
|
||||
"Failed to set file flags");
|
||||
ret = ARCHIVE_WARN;
|
||||
}
|
||||
extract->pst = &extract->st;
|
||||
}
|
||||
#endif
|
||||
/* Linux has flags too, but no chflags syscall */
|
||||
|
||||
Loading…
Reference in New Issue
Block a user