debug.c 3.0 KB

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