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 */ 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 salt[ECRYPTFS_SALT_SIZE * 2] = '\0'; 32 ecryptfs_printk(KERN_DEBUG, " * salt = [%s]\n", salt); 33 if (auth_tok->token.password.flags & 34 ECRYPTFS_PERSISTENT_PASSWORD) { 35 ecryptfs_printk(KERN_DEBUG, " * persistent\n"); 36 } 37 memcpy(sig, auth_tok->token.password.signature, 38 ECRYPTFS_SIG_SIZE_HEX); 39 sig[ECRYPTFS_SIG_SIZE_HEX] = '\0'; 40 ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig); 41 } 42 ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n", 43 auth_tok->session_key.flags); 44 if (auth_tok->session_key.flags 45 & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT) 46 ecryptfs_printk(KERN_DEBUG, 47 " * Userspace decrypt request set\n"); 48 if (auth_tok->session_key.flags 49 & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT) 50 ecryptfs_printk(KERN_DEBUG, 51 " * Userspace encrypt request set\n"); 52 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_DECRYPTED_KEY) { 53 ecryptfs_printk(KERN_DEBUG, " * Contains decrypted key\n"); 54 ecryptfs_printk(KERN_DEBUG, 55 " * session_key.decrypted_key_size = [0x%x]\n", 56 auth_tok->session_key.decrypted_key_size); 57 ecryptfs_printk(KERN_DEBUG, " * Decrypted session key " 58 "dump:\n"); 59 if (ecryptfs_verbosity > 0) 60 ecryptfs_dump_hex(auth_tok->session_key.decrypted_key, 61 ECRYPTFS_DEFAULT_KEY_BYTES); 62 } 63 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_ENCRYPTED_KEY) { 64 ecryptfs_printk(KERN_DEBUG, " * Contains encrypted key\n"); 65 ecryptfs_printk(KERN_DEBUG, 66 " * session_key.encrypted_key_size = [0x%x]\n", 67 auth_tok->session_key.encrypted_key_size); 68 ecryptfs_printk(KERN_DEBUG, " * Encrypted session key " 69 "dump:\n"); 70 if (ecryptfs_verbosity > 0) 71 ecryptfs_dump_hex(auth_tok->session_key.encrypted_key, 72 auth_tok->session_key. 73 encrypted_key_size); 74 } 75 } 76 77 /** 78 * ecryptfs_dump_hex - debug hex printer 79 * @data: string of bytes to be printed 80 * @bytes: number of bytes to print 81 * 82 * Dump hexadecimal representation of char array 83 */ 84 void ecryptfs_dump_hex(char *data, int bytes) 85 { 86 int i = 0; 87 int add_newline = 1; 88 89 if (ecryptfs_verbosity < 1) 90 return; 91 if (bytes != 0) { 92 printk(KERN_DEBUG "0x%.2x.", (unsigned char)data[i]); 93 i++; 94 } 95 while (i < bytes) { 96 printk("0x%.2x.", (unsigned char)data[i]); 97 i++; 98 if (i % 16 == 0) { 99 printk("\n"); 100 add_newline = 0; 101 } else 102 add_newline = 1; 103 } 104 if (add_newline) 105 printk("\n"); 106 } 107 108