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git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs.git
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Michael Halcrow
237fead619
eCryptfs is a stacked cryptographic filesystem for Linux. It is derived from Erez Zadok's Cryptfs, implemented through the FiST framework for generating stacked filesystems. eCryptfs extends Cryptfs to provide advanced key management and policy features. eCryptfs stores cryptographic metadata in the header of each file written, so that encrypted files can be copied between hosts; the file will be decryptable with the proper key, and there is no need to keep track of any additional information aside from what is already in the encrypted file itself. [[email protected]: updates for ongoing API changes] [[email protected]: cleanups] [[email protected]: alpha build fix] [[email protected]: cleanups] [[email protected]: inode-diet updates] [[email protected]: generic_file_*_read/write() interface updates] [[email protected]: printk format fixes] [[email protected]: make slab creation and teardown table-driven] Signed-off-by: Phillip Hellewell <[email protected]> Signed-off-by: Michael Halcrow <[email protected]> Signed-off-by: Erez Zadok <[email protected]> Signed-off-by: Adrian Bunk <[email protected]> Signed-off-by: Stephan Mueller <[email protected]> Signed-off-by: "Theodore Ts'o" <[email protected]> Signed-off-by: Badari Pulavarty <[email protected]> Signed-off-by: Randy Dunlap <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>
124 lines
4.0 KiB
C
124 lines
4.0 KiB
C
/**
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* eCryptfs: Linux filesystem encryption layer
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* Functions only useful for debugging.
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*
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* Copyright (C) 2006 International Business Machines Corp.
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* Author(s): Michael A. Halcrow <[email protected]>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of the
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* License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
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* 02111-1307, USA.
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*/
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#include "ecryptfs_kernel.h"
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/**
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* ecryptfs_dump_auth_tok - debug function to print auth toks
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*
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* This function will print the contents of an ecryptfs authentication
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* token.
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*/
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void ecryptfs_dump_auth_tok(struct ecryptfs_auth_tok *auth_tok)
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{
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char salt[ECRYPTFS_SALT_SIZE * 2 + 1];
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char sig[ECRYPTFS_SIG_SIZE_HEX + 1];
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ecryptfs_printk(KERN_DEBUG, "Auth tok at mem loc [%p]:\n",
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auth_tok);
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if (ECRYPTFS_CHECK_FLAG(auth_tok->flags, ECRYPTFS_PRIVATE_KEY)) {
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ecryptfs_printk(KERN_DEBUG, " * private key type\n");
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ecryptfs_printk(KERN_DEBUG, " * (NO PRIVATE KEY SUPPORT "
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"IN ECRYPTFS VERSION 0.1)\n");
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} else {
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ecryptfs_printk(KERN_DEBUG, " * passphrase type\n");
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ecryptfs_to_hex(salt, auth_tok->token.password.salt,
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ECRYPTFS_SALT_SIZE);
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salt[ECRYPTFS_SALT_SIZE * 2] = '\0';
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ecryptfs_printk(KERN_DEBUG, " * salt = [%s]\n", salt);
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if (ECRYPTFS_CHECK_FLAG(auth_tok->token.password.flags,
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ECRYPTFS_PERSISTENT_PASSWORD)) {
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ecryptfs_printk(KERN_DEBUG, " * persistent\n");
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}
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memcpy(sig, auth_tok->token.password.signature,
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ECRYPTFS_SIG_SIZE_HEX);
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sig[ECRYPTFS_SIG_SIZE_HEX] = '\0';
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ecryptfs_printk(KERN_DEBUG, " * signature = [%s]\n", sig);
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}
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ecryptfs_printk(KERN_DEBUG, " * session_key.flags = [0x%x]\n",
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auth_tok->session_key.flags);
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if (auth_tok->session_key.flags
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& ECRYPTFS_USERSPACE_SHOULD_TRY_TO_DECRYPT)
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ecryptfs_printk(KERN_DEBUG,
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" * Userspace decrypt request set\n");
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if (auth_tok->session_key.flags
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& ECRYPTFS_USERSPACE_SHOULD_TRY_TO_ENCRYPT)
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ecryptfs_printk(KERN_DEBUG,
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" * Userspace encrypt request set\n");
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if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_DECRYPTED_KEY) {
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ecryptfs_printk(KERN_DEBUG, " * Contains decrypted key\n");
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ecryptfs_printk(KERN_DEBUG,
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" * session_key.decrypted_key_size = [0x%x]\n",
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auth_tok->session_key.decrypted_key_size);
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ecryptfs_printk(KERN_DEBUG, " * Decrypted session key "
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"dump:\n");
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if (ecryptfs_verbosity > 0)
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ecryptfs_dump_hex(auth_tok->session_key.decrypted_key,
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ECRYPTFS_DEFAULT_KEY_BYTES);
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}
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if (auth_tok->session_key.flags & ECRYPTFS_CONTAINS_ENCRYPTED_KEY) {
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ecryptfs_printk(KERN_DEBUG, " * Contains encrypted key\n");
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ecryptfs_printk(KERN_DEBUG,
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" * session_key.encrypted_key_size = [0x%x]\n",
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auth_tok->session_key.encrypted_key_size);
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ecryptfs_printk(KERN_DEBUG, " * Encrypted session key "
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"dump:\n");
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if (ecryptfs_verbosity > 0)
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ecryptfs_dump_hex(auth_tok->session_key.encrypted_key,
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auth_tok->session_key.
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encrypted_key_size);
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}
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}
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/**
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* ecryptfs_dump_hex - debug hex printer
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* @data: string of bytes to be printed
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* @bytes: number of bytes to print
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*
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* Dump hexadecimal representation of char array
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*/
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void ecryptfs_dump_hex(char *data, int bytes)
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{
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int i = 0;
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int add_newline = 1;
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if (ecryptfs_verbosity < 1)
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return;
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if (bytes != 0) {
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printk(KERN_DEBUG "0x%.2x.", (unsigned char)data[i]);
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i++;
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}
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while (i < bytes) {
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printk("0x%.2x.", (unsigned char)data[i]);
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i++;
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if (i % 16 == 0) {
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printk("\n");
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add_newline = 0;
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} else
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add_newline = 1;
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}
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if (add_newline)
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printk("\n");
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}
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