1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3 * eCryptfs: Linux filesystem encryption layer
4 * Functions only useful for debugging.
5 *
6 * Copyright (C) 2006 International Business Machines Corp.
7 * Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
8 */
9
10 #include "ecryptfs_kernel.h"
11
12 /*
13 * ecryptfs_dump_auth_tok - debug function to print auth toks
14 *
15 * This function will print the contents of an ecryptfs authentication
16 * token.
17 */
ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok * auth_tok)18 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok)
19 {
20 char salt[ECRYPTFS_SALT_SIZE * 2 + 1];
21 char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
22
23 ecryptfs_printk(KERN_DEBUG, "Auth tok at mem loc [%p]:\n",
24 auth_tok);
25 if (auth_tok->flags & ECRYPTFS_PRIVATE_KEY) {
26 ecryptfs_printk(KERN_DEBUG, " * private key type\n");
27 } else {
28 ecryptfs_printk(KERN_DEBUG, " * passphrase type\n");
29 ecryptfs_to_hex(salt, auth_tok->token.password.salt,
30 ECRYPTFS_SALT_SIZE);
31 ecryptfs_printk(KERN_DEBUG, " * salt = [%s]\n", salt);
32 if (auth_tok->token.password.flags &
33 ECRYPTFS_PERSISTENT_PASSWORD) {
34 ecryptfs_printk(KERN_DEBUG, " * persistent\n");
35 }
36 memcpy(sig, auth_tok->token.password.signature,
37 ECRYPTFS_SIG_SIZE_HEX);
38 sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
39 ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig);
40 }
41 ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n",
42 auth_tok->session_key.flags);
43 if (auth_tok->session_key.flags
44 & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT)
45 ecryptfs_printk(KERN_DEBUG,
46 " * Userspace decrypt request set\n");
47 if (auth_tok->session_key.flags
48 & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT)
49 ecryptfs_printk(KERN_DEBUG,
50 " * Userspace encrypt request set\n");
51 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_DECRYPTED_KEY) {
52 ecryptfs_printk(KERN_DEBUG, " * Contains decrypted key\n");
53 ecryptfs_printk(KERN_DEBUG,
54 " * session_key.decrypted_key_size = [0x%x]\n",
55 auth_tok->session_key.decrypted_key_size);
56 ecryptfs_printk(KERN_DEBUG, " * Decrypted session key "
57 "dump:\n");
58 if (ecryptfs_verbosity > 0)
59 ecryptfs_dump_hex(auth_tok->session_key.decrypted_key,
60 ECRYPTFS_DEFAULT_KEY_BYTES);
61 }
62 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_ENCRYPTED_KEY) {
63 ecryptfs_printk(KERN_DEBUG, " * Contains encrypted key\n");
64 ecryptfs_printk(KERN_DEBUG,
65 " * session_key.encrypted_key_size = [0x%x]\n",
66 auth_tok->session_key.encrypted_key_size);
67 ecryptfs_printk(KERN_DEBUG, " * Encrypted session key "
68 "dump:\n");
69 if (ecryptfs_verbosity > 0)
70 ecryptfs_dump_hex(auth_tok->session_key.encrypted_key,
71 auth_tok->session_key.
72 encrypted_key_size);
73 }
74 }
75
76 /**
77 * ecryptfs_dump_hex - debug hex printer
78 * @data: string of bytes to be printed
79 * @bytes: number of bytes to print
80 *
81 * Dump hexadecimal representation of char array
82 */
ecryptfs_dump_hex(char * data,int bytes)83 void ecryptfs_dump_hex(char *data, int bytes)
84 {
85 if (ecryptfs_verbosity < 1)
86 return;
87
88 print_hex_dump(KERN_DEBUG, "ecryptfs: ", DUMP_PREFIX_OFFSET, 16, 1,
89 data, bytes, false);
90 }
91