125 lines
3.9 KiB
C
125 lines
3.9 KiB
C
/*
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* Copyright (c) 1997 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: verify_mic.c,v 1.8 1999/12/02 17:05:04 joda Exp $");
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OM_uint32 gss_verify_mic
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(OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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const gss_buffer_t message_buffer,
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const gss_buffer_t token_buffer,
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gss_qop_t * qop_state
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)
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{
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u_char *p;
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struct md5 md5;
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u_char hash[16], seq_data[8];
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des_key_schedule schedule;
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des_cblock key;
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des_cblock zero;
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int32_t seq_number;
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OM_uint32 ret;
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p = token_buffer->value;
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ret = gssapi_krb5_verify_header (&p,
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token_buffer->length,
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"\x01\x01");
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if (ret)
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return ret;
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if (memcmp(p, "\x00\x00", 2) != 0)
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return GSS_S_BAD_SIG;
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p += 2;
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if (memcmp (p, "\xff\xff\xff\xff", 4) != 0)
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return GSS_S_BAD_MIC;
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p += 4;
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p += 16;
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/* verify 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, message_buffer->value,
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message_buffer->length);
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md5_finito (&md5, hash);
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memset (&zero, 0, sizeof(zero));
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#if 0
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memcpy (&key, context_handle->auth_context->key.keyvalue.data,
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sizeof(key));
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#endif
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memcpy (&key, context_handle->auth_context->remote_subkey->keyvalue.data,
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sizeof(key));
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des_set_key (&key, schedule);
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des_cbc_cksum ((des_cblock *)hash,
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(des_cblock *)hash, sizeof(hash), schedule, &zero);
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if (memcmp (p - 8, hash, 8) != 0) {
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memset (key, 0, sizeof(key));
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memset (schedule, 0, sizeof(schedule));
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return GSS_S_BAD_MIC;
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}
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/* verify sequence number */
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krb5_auth_getremoteseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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&seq_number);
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seq_data[0] = (seq_number >> 0) & 0xFF;
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seq_data[1] = (seq_number >> 8) & 0xFF;
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seq_data[2] = (seq_number >> 16) & 0xFF;
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seq_data[3] = (seq_number >> 24) & 0xFF;
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memset (seq_data + 4,
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(context_handle->more_flags & LOCAL) ? 0xFF : 0,
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4);
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p -= 16;
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des_set_key (&key, schedule);
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des_cbc_encrypt ((des_cblock *)p, (des_cblock *)p, 8,
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schedule, (des_cblock *)hash, DES_DECRYPT);
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memset (key, 0, sizeof(key));
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memset (schedule, 0, sizeof(schedule));
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if (memcmp (p, seq_data, 8) != 0) {
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return GSS_S_BAD_MIC;
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}
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krb5_auth_setremoteseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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++seq_number);
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return GSS_S_COMPLETE;
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}
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