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Linux/security/keys/encrypted-keys/ecryptfs_format.c

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  1 /*
  2  * ecryptfs_format.c: helper functions for the encrypted key type
  3  *
  4  * Copyright (C) 2006 International Business Machines Corp.
  5  * Copyright (C) 2010 Politecnico di Torino, Italy
  6  *                    TORSEC group -- http://security.polito.it
  7  *
  8  * Authors:
  9  * Michael A. Halcrow <mahalcro@us.ibm.com>
 10  * Tyler Hicks <tyhicks@ou.edu>
 11  * Roberto Sassu <roberto.sassu@polito.it>
 12  *
 13  * This program is free software; you can redistribute it and/or modify
 14  * it under the terms of the GNU General Public License as published by
 15  * the Free Software Foundation, version 2 of the License.
 16  */
 17 
 18 #include <linux/module.h>
 19 #include "ecryptfs_format.h"
 20 
 21 u8 *ecryptfs_get_auth_tok_key(struct ecryptfs_auth_tok *auth_tok)
 22 {
 23         return auth_tok->token.password.session_key_encryption_key;
 24 }
 25 EXPORT_SYMBOL(ecryptfs_get_auth_tok_key);
 26 
 27 /*
 28  * ecryptfs_get_versions()
 29  *
 30  * Source code taken from the software 'ecryptfs-utils' version 83.
 31  *
 32  */
 33 void ecryptfs_get_versions(int *major, int *minor, int *file_version)
 34 {
 35         *major = ECRYPTFS_VERSION_MAJOR;
 36         *minor = ECRYPTFS_VERSION_MINOR;
 37         if (file_version)
 38                 *file_version = ECRYPTFS_SUPPORTED_FILE_VERSION;
 39 }
 40 EXPORT_SYMBOL(ecryptfs_get_versions);
 41 
 42 /*
 43  * ecryptfs_fill_auth_tok - fill the ecryptfs_auth_tok structure
 44  *
 45  * Fill the ecryptfs_auth_tok structure with required ecryptfs data.
 46  * The source code is inspired to the original function generate_payload()
 47  * shipped with the software 'ecryptfs-utils' version 83.
 48  *
 49  */
 50 int ecryptfs_fill_auth_tok(struct ecryptfs_auth_tok *auth_tok,
 51                            const char *key_desc)
 52 {
 53         int major, minor;
 54 
 55         ecryptfs_get_versions(&major, &minor, NULL);
 56         auth_tok->version = (((uint16_t)(major << 8) & 0xFF00)
 57                              | ((uint16_t)minor & 0x00FF));
 58         auth_tok->token_type = ECRYPTFS_PASSWORD;
 59         strncpy((char *)auth_tok->token.password.signature, key_desc,
 60                 ECRYPTFS_PASSWORD_SIG_SIZE);
 61         auth_tok->token.password.session_key_encryption_key_bytes =
 62                 ECRYPTFS_MAX_KEY_BYTES;
 63         /*
 64          * Removed auth_tok->token.password.salt and
 65          * auth_tok->token.password.session_key_encryption_key
 66          * initialization from the original code
 67          */
 68         /* TODO: Make the hash parameterizable via policy */
 69         auth_tok->token.password.flags |=
 70                 ECRYPTFS_SESSION_KEY_ENCRYPTION_KEY_SET;
 71         /* The kernel code will encrypt the session key. */
 72         auth_tok->session_key.encrypted_key[0] = 0;
 73         auth_tok->session_key.encrypted_key_size = 0;
 74         /* Default; subject to change by kernel eCryptfs */
 75         auth_tok->token.password.hash_algo = PGP_DIGEST_ALGO_SHA512;
 76         auth_tok->token.password.flags &= ~(ECRYPTFS_PERSISTENT_PASSWORD);
 77         return 0;
 78 }
 79 EXPORT_SYMBOL(ecryptfs_fill_auth_tok);
 80 
 81 MODULE_LICENSE("GPL");
 82 

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