root/fs/ecryptfs/debug.c

DEFINITIONS

1. ecryptfs_dump_auth_tok
2. ecryptfs_dump_hex

/**
 * 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>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as
 * published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 */

#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)
{
        int i = 0;
        int add_newline = 1;

        if (ecryptfs_verbosity < 1)
                return;
        if (bytes != 0) {
                printk(KERN_DEBUG "0x%.2x.", (unsigned char)data[i]);
                i++;
        }
        while (i < bytes) {
                printk("0x%.2x.", (unsigned char)data[i]);
                i++;
                if (i % 16 == 0) {
                        printk("\n");
                        add_newline = 0;
                } else
                        add_newline = 1;
        }
        if (add_newline)
                printk("\n");
}