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    Subject[PATCH 13/13: eCryptfs] Debug functions
    This is the 13th patch in a series of 13 constituting the kernel
    components of the eCryptfs cryptographic filesystem.

    Functions used only for debugging purposes; typically called when the
    verbosity is turned higher than 0.

    Signed-off-by: Phillip Hellewell <phillip@hellewell.homeip.net>
    Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>

    ---

    debug.c | 130 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
    1 files changed, 130 insertions(+)

    Index: linux-2.6.17-rc3-mm1-ecryptfs/fs/ecryptfs/debug.c
    ===================================================================
    --- /dev/null 1970-01-01 00:00:00.000000000 +0000
    +++ linux-2.6.17-rc3-mm1-ecryptfs/fs/ecryptfs/debug.c 2006-05-12 20:00:26.000000000 -0600
    @@ -0,0 +1,130 @@
    +/**
    + * 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 (ECRYPTFS_CHECK_FLAG(auth_tok->flags, ECRYPTFS_PRIVATE_KEY)) {
    + ecryptfs_printk(KERN_DEBUG, " * private key type\n");
    + ecryptfs_printk(KERN_DEBUG, " * (NO PRIVATE KEY SUPPORT "
    + "IN ECRYPTFS VERSION 0.1)\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 (ECRYPTFS_CHECK_FLAG(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);
    + }
    + if (ECRYPTFS_CHECK_FLAG(auth_tok->flags, ECRYPTFS_CONTAINS_SECRET)) {
    + ecryptfs_printk(KERN_DEBUG, " * contains secret value\n");
    + } else {
    + ecryptfs_printk(KERN_DEBUG, " * lacks secret value\n");
    + }
    + if (ECRYPTFS_CHECK_FLAG(auth_tok->flags, ECRYPTFS_EXPIRED))
    + ecryptfs_printk(KERN_DEBUG, " * expired\n");
    + 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");
    +}
    +
    -
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