xref: /linux/fs/ecryptfs/debug.c (revision 827634added7f38b7d724cab1dccdb2b004c13c3)
1 /**
2  * eCryptfs: Linux filesystem encryption layer
3  * Functions only useful for debugging.
4  *
5  * Copyright (C) 2006 International Business Machines Corp.
6  *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of the
11  * License, or (at your option) any later version.
12  *
13  * This program is distributed in the hope that it will be useful, but
14  * WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16  * General Public License for more details.
17  *
18  * You should have received a copy of the GNU General Public License
19  * along with this program; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21  * 02111-1307, USA.
22  */
23 
24 #include "ecryptfs_kernel.h"
25 
26 /**
27  * ecryptfs_dump_auth_tok - debug function to print auth toks
28  *
29  * This function will print the contents of an ecryptfs authentication
30  * token.
31  */
32 void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok)
33 {
34 	char salt[ECRYPTFS_SALT_SIZE * 2 + 1];
35 	char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
36 
37 	ecryptfs_printk(KERN_DEBUG, "Auth tok at mem loc [%p]:\n",
38 			auth_tok);
39 	if (auth_tok->flags & ECRYPTFS_PRIVATE_KEY) {
40 		ecryptfs_printk(KERN_DEBUG, " * private key type\n");
41 	} else {
42 		ecryptfs_printk(KERN_DEBUG, " * passphrase type\n");
43 		ecryptfs_to_hex(salt, auth_tok->token.password.salt,
44 				ECRYPTFS_SALT_SIZE);
45 		salt[ECRYPTFS_SALT_SIZE * 2] = '\0';
46 		ecryptfs_printk(KERN_DEBUG, " * salt = [%s]\n", salt);
47 		if (auth_tok->token.password.flags &
48 		    ECRYPTFS_PERSISTENT_PASSWORD) {
49 			ecryptfs_printk(KERN_DEBUG, " * persistent\n");
50 		}
51 		memcpy(sig, auth_tok->token.password.signature,
52 		       ECRYPTFS_SIG_SIZE_HEX);
53 		sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
54 		ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig);
55 	}
56 	ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n",
57 			auth_tok->session_key.flags);
58 	if (auth_tok->session_key.flags
59 	    & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT)
60 		ecryptfs_printk(KERN_DEBUG,
61 				" * Userspace decrypt request set\n");
62 	if (auth_tok->session_key.flags
63 	    & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT)
64 		ecryptfs_printk(KERN_DEBUG,
65 				" * Userspace encrypt request set\n");
66 	if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_DECRYPTED_KEY) {
67 		ecryptfs_printk(KERN_DEBUG, " * Contains decrypted key\n");
68 		ecryptfs_printk(KERN_DEBUG,
69 				" * session_key.decrypted_key_size = [0x%x]\n",
70 				auth_tok->session_key.decrypted_key_size);
71 		ecryptfs_printk(KERN_DEBUG, " * Decrypted session key "
72 				"dump:\n");
73 		if (ecryptfs_verbosity > 0)
74 			ecryptfs_dump_hex(auth_tok->session_key.decrypted_key,
75 					  ECRYPTFS_DEFAULT_KEY_BYTES);
76 	}
77 	if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_ENCRYPTED_KEY) {
78 		ecryptfs_printk(KERN_DEBUG, " * Contains encrypted key\n");
79 		ecryptfs_printk(KERN_DEBUG,
80 				" * session_key.encrypted_key_size = [0x%x]\n",
81 				auth_tok->session_key.encrypted_key_size);
82 		ecryptfs_printk(KERN_DEBUG, " * Encrypted session key "
83 				"dump:\n");
84 		if (ecryptfs_verbosity > 0)
85 			ecryptfs_dump_hex(auth_tok->session_key.encrypted_key,
86 					  auth_tok->session_key.
87 					  encrypted_key_size);
88 	}
89 }
90 
91 /**
92  * ecryptfs_dump_hex - debug hex printer
93  * @data: string of bytes to be printed
94  * @bytes: number of bytes to print
95  *
96  * Dump hexadecimal representation of char array
97  */
98 void ecryptfs_dump_hex(char *data, int bytes)
99 {
100 	int i = 0;
101 	int add_newline = 1;
102 
103 	if (ecryptfs_verbosity < 1)
104 		return;
105 	if (bytes != 0) {
106 		printk(KERN_DEBUG "0x%.2x.", (unsigned char)data[i]);
107 		i++;
108 	}
109 	while (i < bytes) {
110 		printk("0x%.2x.", (unsigned char)data[i]);
111 		i++;
112 		if (i % 16 == 0) {
113 			printk("\n");
114 			add_newline = 0;
115 		} else
116 			add_newline = 1;
117 	}
118 	if (add_newline)
119 		printk("\n");
120 }
121 
122