455 lines
12 KiB
C
455 lines
12 KiB
C
/*
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* Copyright (c) 1997 - 2003 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "gssapi_locl.h"
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RCSID("$Id: wrap.c,v 1.21.2.1 2003/09/18 22:05:45 lha Exp $");
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OM_uint32
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gss_krb5_get_localkey(const gss_ctx_id_t context_handle,
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krb5_keyblock **key)
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{
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krb5_keyblock *skey;
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krb5_auth_con_getlocalsubkey(gssapi_krb5_context,
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context_handle->auth_context,
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&skey);
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if(skey == NULL)
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krb5_auth_con_getremotesubkey(gssapi_krb5_context,
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context_handle->auth_context,
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&skey);
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if(skey == NULL)
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krb5_auth_con_getkey(gssapi_krb5_context,
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context_handle->auth_context,
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&skey);
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if(skey == NULL)
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return GSS_S_FAILURE;
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*key = skey;
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return 0;
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}
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static OM_uint32
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sub_wrap_size (
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OM_uint32 req_output_size,
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OM_uint32 * max_input_size,
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int blocksize,
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int extrasize
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)
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{
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size_t len, total_len, padlength;
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padlength = blocksize - (req_output_size % blocksize);
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len = req_output_size + 8 + padlength + extrasize;
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gssapi_krb5_encap_length(len, &len, &total_len);
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*max_input_size = (OM_uint32)total_len;
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return GSS_S_COMPLETE;
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}
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OM_uint32
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gss_wrap_size_limit (
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OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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OM_uint32 req_output_size,
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OM_uint32 * max_input_size
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)
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{
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krb5_keyblock *key;
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OM_uint32 ret;
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krb5_keytype keytype;
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ret = gss_krb5_get_localkey(context_handle, &key);
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if (ret) {
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gssapi_krb5_set_error_string ();
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
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switch (keytype) {
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case KEYTYPE_DES :
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case KEYTYPE_ARCFOUR:
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ret = sub_wrap_size(req_output_size, max_input_size, 8, 22);
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break;
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case KEYTYPE_DES3 :
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ret = sub_wrap_size(req_output_size, max_input_size, 8, 34);
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break;
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default :
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*minor_status = KRB5_PROG_ETYPE_NOSUPP;
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ret = GSS_S_FAILURE;
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break;
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}
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krb5_free_keyblock (gssapi_krb5_context, key);
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*minor_status = 0;
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return ret;
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}
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static OM_uint32
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wrap_des
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(OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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const gss_buffer_t input_message_buffer,
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int * conf_state,
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gss_buffer_t output_message_buffer,
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krb5_keyblock *key
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)
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{
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u_char *p;
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MD5_CTX md5;
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u_char hash[16];
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des_key_schedule schedule;
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des_cblock deskey;
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des_cblock zero;
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int i;
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int32_t seq_number;
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size_t len, total_len, padlength, datalen;
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padlength = 8 - (input_message_buffer->length % 8);
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datalen = input_message_buffer->length + padlength + 8;
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len = datalen + 22;
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gssapi_krb5_encap_length (len, &len, &total_len);
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output_message_buffer->length = total_len;
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output_message_buffer->value = malloc (total_len);
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if (output_message_buffer->value == NULL) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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p = gssapi_krb5_make_header(output_message_buffer->value,
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len,
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"\x02\x01"); /* TOK_ID */
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/* SGN_ALG */
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memcpy (p, "\x00\x00", 2);
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p += 2;
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/* SEAL_ALG */
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if(conf_req_flag)
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memcpy (p, "\x00\x00", 2);
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else
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memcpy (p, "\xff\xff", 2);
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p += 2;
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/* Filler */
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memcpy (p, "\xff\xff", 2);
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p += 2;
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/* fill in later */
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memset (p, 0, 16);
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p += 16;
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/* confounder + data + pad */
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krb5_generate_random_block(p, 8);
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memcpy (p + 8, input_message_buffer->value,
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input_message_buffer->length);
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memset (p + 8 + input_message_buffer->length, padlength, padlength);
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/* checksum */
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MD5_Init (&md5);
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MD5_Update (&md5, p - 24, 8);
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MD5_Update (&md5, p, datalen);
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MD5_Final (hash, &md5);
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memset (&zero, 0, sizeof(zero));
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memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
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des_set_key (&deskey, schedule);
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des_cbc_cksum ((void *)hash, (void *)hash, sizeof(hash),
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schedule, &zero);
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memcpy (p - 8, hash, 8);
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/* sequence number */
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krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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&seq_number);
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p -= 16;
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p[0] = (seq_number >> 0) & 0xFF;
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p[1] = (seq_number >> 8) & 0xFF;
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p[2] = (seq_number >> 16) & 0xFF;
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p[3] = (seq_number >> 24) & 0xFF;
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memset (p + 4,
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(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
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4);
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des_set_key (&deskey, schedule);
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des_cbc_encrypt ((void *)p, (void *)p, 8,
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schedule, (des_cblock *)(p + 8), DES_ENCRYPT);
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krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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++seq_number);
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/* encrypt the data */
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p += 16;
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if(conf_req_flag) {
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memcpy (&deskey, key->keyvalue.data, sizeof(deskey));
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for (i = 0; i < sizeof(deskey); ++i)
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deskey[i] ^= 0xf0;
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des_set_key (&deskey, schedule);
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memset (&zero, 0, sizeof(zero));
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des_cbc_encrypt ((void *)p,
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(void *)p,
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datalen,
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schedule,
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&zero,
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DES_ENCRYPT);
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memset (deskey, 0, sizeof(deskey));
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memset (schedule, 0, sizeof(schedule));
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}
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if(conf_state != NULL)
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*conf_state = conf_req_flag;
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*minor_status = 0;
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return GSS_S_COMPLETE;
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}
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static OM_uint32
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wrap_des3
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(OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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const gss_buffer_t input_message_buffer,
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int * conf_state,
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gss_buffer_t output_message_buffer,
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krb5_keyblock *key
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)
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{
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u_char *p;
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u_char seq[8];
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int32_t seq_number;
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size_t len, total_len, padlength, datalen;
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u_int32_t ret;
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krb5_crypto crypto;
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Checksum cksum;
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krb5_data encdata;
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padlength = 8 - (input_message_buffer->length % 8);
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datalen = input_message_buffer->length + padlength + 8;
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len = datalen + 34;
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gssapi_krb5_encap_length (len, &len, &total_len);
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output_message_buffer->length = total_len;
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output_message_buffer->value = malloc (total_len);
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if (output_message_buffer->value == NULL) {
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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p = gssapi_krb5_make_header(output_message_buffer->value,
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len,
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"\x02\x01"); /* TOK_ID */
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/* SGN_ALG */
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memcpy (p, "\x04\x00", 2); /* HMAC SHA1 DES3-KD */
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p += 2;
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/* SEAL_ALG */
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if(conf_req_flag)
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memcpy (p, "\x02\x00", 2); /* DES3-KD */
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else
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memcpy (p, "\xff\xff", 2);
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p += 2;
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/* Filler */
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memcpy (p, "\xff\xff", 2);
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p += 2;
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/* calculate checksum (the above + confounder + data + pad) */
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memcpy (p + 20, p - 8, 8);
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krb5_generate_random_block(p + 28, 8);
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memcpy (p + 28 + 8, input_message_buffer->value,
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input_message_buffer->length);
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memset (p + 28 + 8 + input_message_buffer->length, padlength, padlength);
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ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
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if (ret) {
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gssapi_krb5_set_error_string ();
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free (output_message_buffer->value);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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ret = krb5_create_checksum (gssapi_krb5_context,
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crypto,
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KRB5_KU_USAGE_SIGN,
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0,
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p + 20,
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datalen + 8,
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&cksum);
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krb5_crypto_destroy (gssapi_krb5_context, crypto);
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if (ret) {
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gssapi_krb5_set_error_string ();
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free (output_message_buffer->value);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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/* zero out SND_SEQ + SGN_CKSUM in case */
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memset (p, 0, 28);
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memcpy (p + 8, cksum.checksum.data, cksum.checksum.length);
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free_Checksum (&cksum);
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/* sequence number */
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krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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&seq_number);
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seq[0] = (seq_number >> 0) & 0xFF;
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seq[1] = (seq_number >> 8) & 0xFF;
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seq[2] = (seq_number >> 16) & 0xFF;
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seq[3] = (seq_number >> 24) & 0xFF;
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memset (seq + 4,
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(context_handle->more_flags & LOCAL) ? 0 : 0xFF,
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4);
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ret = krb5_crypto_init(gssapi_krb5_context, key, ETYPE_DES3_CBC_NONE,
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&crypto);
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if (ret) {
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free (output_message_buffer->value);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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{
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des_cblock ivec;
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memcpy (&ivec, p + 8, 8);
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ret = krb5_encrypt_ivec (gssapi_krb5_context,
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crypto,
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KRB5_KU_USAGE_SEQ,
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seq, 8, &encdata,
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&ivec);
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}
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krb5_crypto_destroy (gssapi_krb5_context, crypto);
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if (ret) {
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gssapi_krb5_set_error_string ();
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free (output_message_buffer->value);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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assert (encdata.length == 8);
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memcpy (p, encdata.data, encdata.length);
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krb5_data_free (&encdata);
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krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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++seq_number);
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/* encrypt the data */
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p += 28;
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if(conf_req_flag) {
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krb5_data tmp;
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ret = krb5_crypto_init(gssapi_krb5_context, key,
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ETYPE_DES3_CBC_NONE, &crypto);
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if (ret) {
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gssapi_krb5_set_error_string ();
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free (output_message_buffer->value);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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ret = krb5_encrypt(gssapi_krb5_context, crypto, KRB5_KU_USAGE_SEAL,
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p, datalen, &tmp);
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krb5_crypto_destroy(gssapi_krb5_context, crypto);
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if (ret) {
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gssapi_krb5_set_error_string ();
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free (output_message_buffer->value);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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assert (tmp.length == datalen);
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memcpy (p, tmp.data, datalen);
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krb5_data_free(&tmp);
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}
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if(conf_state != NULL)
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*conf_state = conf_req_flag;
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*minor_status = 0;
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return GSS_S_COMPLETE;
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}
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OM_uint32 gss_wrap
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(OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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const gss_buffer_t input_message_buffer,
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int * conf_state,
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gss_buffer_t output_message_buffer
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)
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{
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krb5_keyblock *key;
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OM_uint32 ret;
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krb5_keytype keytype;
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ret = gss_krb5_get_localkey(context_handle, &key);
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if (ret) {
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gssapi_krb5_set_error_string ();
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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krb5_enctype_to_keytype (gssapi_krb5_context, key->keytype, &keytype);
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switch (keytype) {
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case KEYTYPE_DES :
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ret = wrap_des (minor_status, context_handle, conf_req_flag,
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qop_req, input_message_buffer, conf_state,
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output_message_buffer, key);
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break;
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case KEYTYPE_DES3 :
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ret = wrap_des3 (minor_status, context_handle, conf_req_flag,
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qop_req, input_message_buffer, conf_state,
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output_message_buffer, key);
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break;
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case KEYTYPE_ARCFOUR:
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ret = _gssapi_wrap_arcfour (minor_status, context_handle, conf_req_flag,
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qop_req, input_message_buffer, conf_state,
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output_message_buffer, key);
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break;
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default :
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*minor_status = KRB5_PROG_ETYPE_NOSUPP;
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ret = GSS_S_FAILURE;
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break;
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}
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krb5_free_keyblock (gssapi_krb5_context, key);
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return ret;
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}
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