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checkpath: do not chown or chmod symbolic links

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This is another security fix. If you use chown() or chmod() on a
symbolic link, it affects the referenced file, not the symbolic link
itself.

X-Gentoo-Bug: 540006
X-Gentoo-Bug-URL: https://bugs.gentoo.org/show_bug.cgi?id=540006
This commit is contained in:
William Hubbs 2015-02-19 12:44:21 -06:00
parent 423f82bae9
commit a0378f3871
1 changed files with 11 additions and 3 deletions
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14
src/rc/checkpath.c
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@ -68,7 +68,7 @@ static int do_check(char *path, uid_t uid, gid_t gid, mode_t mode,
int u;
memset(&st, 0, sizeof(st));
if (stat(path, &st) || trunc) {
if (lstat(path, &st) || trunc) {
if (type == inode_file) {
einfo("%s: creating file", path);
if (!mode) /* 664 */
@ -133,10 +133,14 @@ static int do_check(char *path, uid_t uid, gid_t gid, mode_t mode,
}
if (mode && (st.st_mode & 0777) != mode) {
if ((type != inode_dir) && (st.st_nlink != 1)) {
if ((type != inode_dir) && (st.st_nlink > 1)) {
eerror("%s: chmod: %s %s", applet, "Too many hard links to", path);
return -1;
}
if (S_ISLNK(st.st_mode)) {
eerror("%s: chmod: %s %s", applet, path, " is a symbolic link");
return -1;
}
einfo("%s: correcting mode", path);
if (chmod(path, mode)) {
eerror("%s: chmod: %s", applet, strerror(errno));
@ -145,10 +149,14 @@ static int do_check(char *path, uid_t uid, gid_t gid, mode_t mode,
}
if (chowner && (st.st_uid != uid || st.st_gid != gid)) {
if ((type != inode_dir) && (st.st_nlink != 1)) {
if ((type != inode_dir) && (st.st_nlink > 1)) {
eerror("%s: chown: %s %s", applet, "Too many hard links to", path);
return -1;
}
if (S_ISLNK(st.st_mode)) {
eerror("%s: chown: %s %s", applet, path, " is a symbolic link");
return -1;
}
einfo("%s: correcting owner", path);
if (chown(path, uid, gid)) {
eerror("%s: chown: %s", applet, strerror(errno));