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 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 */ 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