1: /*
2: * Copyright (c) 2012 Todd C. Miller <Todd.Miller@courtesan.com>
3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <config.h>
18:
19: #include <sys/types.h>
20: #include <sys/stat.h>
21: #include <stdio.h>
22: #ifdef HAVE_STRING_H
23: # include <string.h>
24: #endif /* HAVE_STRING_H */
25: #ifdef HAVE_STRINGS_H
26: # include <strings.h>
27: #endif /* HAVE_STRINGS_H */
28: #ifdef HAVE_UNISTD_H
29: # include <unistd.h>
30: #endif /* HAVE_UNISTD_H */
31: #include <errno.h>
32:
33: #include "missing.h"
34: #include "sudo_debug.h"
35: #include "secure_path.h"
36:
37: /*
38: * Verify that path is the right type and not writable by other users.
39: */
40: int
41: sudo_secure_path(const char *path, unsigned int type, uid_t uid, gid_t gid, struct stat *sbp)
42: {
43: struct stat sb;
44: int rval = SUDO_PATH_MISSING;
45: debug_decl(sudo_secure_path, SUDO_DEBUG_UTIL)
46:
47: if (path != NULL && stat(path, &sb) == 0) {
48: if ((sb.st_mode & _S_IFMT) != type) {
49: rval = SUDO_PATH_BAD_TYPE;
50: } else if (uid != (uid_t)-1 && sb.st_uid != uid) {
51: rval = SUDO_PATH_WRONG_OWNER;
52: } else if (sb.st_mode & S_IWOTH) {
53: rval = SUDO_PATH_WORLD_WRITABLE;
54: } else if (ISSET(sb.st_mode, S_IWGRP) &&
55: (gid == (gid_t)-1 || sb.st_gid != gid)) {
56: rval = SUDO_PATH_GROUP_WRITABLE;
57: } else {
58: rval = SUDO_PATH_SECURE;
59: }
60: if (sbp)
61: (void) memcpy(sbp, &sb, sizeof(struct stat));
62: }
63:
64: debug_return_int(rval);
65: }
66:
67: /*
68: * Verify that path is a regular file and not writable by other users.
69: */
70: int
71: sudo_secure_file(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
72: {
73: return sudo_secure_path(path, _S_IFREG, uid, gid, sbp);
74: }
75:
76: /*
77: * Verify that path is a directory and not writable by other users.
78: */
79: int
80: sudo_secure_dir(const char *path, uid_t uid, gid_t gid, struct stat *sbp)
81: {
82: return sudo_secure_path(path, _S_IFDIR, uid, gid, sbp);
83: }
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