Quelle  debug.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * eCryptfs: Linux filesystem encryption layer
 * Functions only useful for debugging.
 *
 * Copyright (C) 2006 International Business Machines Corp.
 *   Author(s): Michael A. Halcrow <mahalcro@us.ibm.com>
 */

#include "ecryptfs_kernel.h"

/*
 * ecryptfs_dump_auth_tok - debug function to print auth toks
 *
 * This function will print the contents of an ecryptfs authentication
 * token.
 */
void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok)
{
 char salt[ECRYPTFS_SALT_SIZE * 2 + 1];
 char sig[ECRYPTFS_SIG_SIZE_HEX + 1];

 ecryptfs_printk(KERN_DEBUG, "Auth tok at mem loc [%p]:\n",
   auth_tok);
 if (auth_tok->flags & ECRYPTFS_PRIVATE_KEY) {
  ecryptfs_printk(KERN_DEBUG, " * private key type\n");
 } else {
  ecryptfs_printk(KERN_DEBUG, " * passphrase type\n");
  ecryptfs_to_hex(salt, auth_tok->token.password.salt,
    ECRYPTFS_SALT_SIZE);
  salt[ECRYPTFS_SALT_SIZE * 2] = '\0';
  ecryptfs_printk(KERN_DEBUG, " * salt = [%s]\n", salt);
  if (auth_tok->token.password.flags &
      ECRYPTFS_PERSISTENT_PASSWORD) {
   ecryptfs_printk(KERN_DEBUG, " * persistent\n");
  }
  memcpy(sig, auth_tok->token.password.signature,
         ECRYPTFS_SIG_SIZE_HEX);
  sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
  ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig);
 }
 ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n",
   auth_tok->session_key.flags);
 if (auth_tok->session_key.flags
     & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT)
  ecryptfs_printk(KERN_DEBUG,
    " * Userspace decrypt request set\n");
 if (auth_tok->session_key.flags
     & ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT)
  ecryptfs_printk(KERN_DEBUG,
    " * Userspace encrypt request set\n");
 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_DECRYPTED_KEY) {
  ecryptfs_printk(KERN_DEBUG, " * Contains decrypted key\n");
  ecryptfs_printk(KERN_DEBUG,
    " * session_key.decrypted_key_size = [0x%x]\n",
    auth_tok->session_key.decrypted_key_size);
  ecryptfs_printk(KERN_DEBUG, " * Decrypted session key "
    "dump:\n");
  if (ecryptfs_verbosity > 0)
   ecryptfs_dump_hex(auth_tok->session_key.decrypted_key,
       ECRYPTFS_DEFAULT_KEY_BYTES);
 }
 if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_ENCRYPTED_KEY) {
  ecryptfs_printk(KERN_DEBUG, " * Contains encrypted key\n");
  ecryptfs_printk(KERN_DEBUG,
    " * session_key.encrypted_key_size = [0x%x]\n",
    auth_tok->session_key.encrypted_key_size);
  ecryptfs_printk(KERN_DEBUG, " * Encrypted session key "
    "dump:\n");
  if (ecryptfs_verbosity > 0)
   ecryptfs_dump_hex(auth_tok->session_key.encrypted_key,
       auth_tok->session_key.
       encrypted_key_size);
 }
}

/**
 * ecryptfs_dump_hex - debug hex printer
 * @data: string of bytes to be printed
 * @bytes: number of bytes to print
 *
 * Dump hexadecimal representation of char array
 */
void ecryptfs_dump_hex(char *data, int bytes)
{
 if (ecryptfs_verbosity < 1)
  return;

 print_hex_dump(KERN_DEBUG, "ecryptfs: ", DUMP_PREFIX_OFFSET, 16, 1,
         data, bytes, false);
}