355 lines
9.3 KiB
C
355 lines
9.3 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 "gsskrb5_locl.h"
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#ifdef HEIM_WEAK_CRYPTO
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static OM_uint32
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verify_mic_des
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(OM_uint32 * minor_status,
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const gsskrb5_ctx context_handle,
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krb5_context context,
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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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krb5_keyblock *key,
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char *type
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)
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{
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u_char *p;
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EVP_MD_CTX *md5;
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u_char hash[16], *seq;
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DES_key_schedule schedule;
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EVP_CIPHER_CTX des_ctx;
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DES_cblock zero;
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DES_cblock deskey;
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uint32_t seq_number;
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OM_uint32 ret;
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int cmp;
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p = token_buffer->value;
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ret = _gsskrb5_verify_header (&p,
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token_buffer->length,
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type,
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GSS_KRB5_MECHANISM);
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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 = EVP_MD_CTX_create();
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EVP_DigestInit_ex(md5, EVP_md5(), NULL);
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EVP_DigestUpdate(md5, p - 24, 8);
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EVP_DigestUpdate(md5, message_buffer->value, message_buffer->length);
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EVP_DigestFinal_ex(md5, hash, NULL);
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EVP_MD_CTX_destroy(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_unchecked (&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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if (ct_memcmp (p - 8, hash, 8) != 0) {
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memset (deskey, 0, sizeof(deskey));
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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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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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p -= 16;
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EVP_CIPHER_CTX_init(&des_ctx);
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EVP_CipherInit_ex(&des_ctx, EVP_des_cbc(), NULL, key->keyvalue.data, hash, 0);
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EVP_Cipher(&des_ctx, p, p, 8);
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EVP_CIPHER_CTX_cleanup(&des_ctx);
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memset (deskey, 0, sizeof(deskey));
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memset (&schedule, 0, sizeof(schedule));
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seq = p;
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_gsskrb5_decode_om_uint32(seq, &seq_number);
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if (context_handle->more_flags & LOCAL)
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cmp = ct_memcmp(&seq[4], "\xff\xff\xff\xff", 4);
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else
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cmp = ct_memcmp(&seq[4], "\x00\x00\x00\x00", 4);
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if (cmp != 0) {
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return GSS_S_BAD_MIC;
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}
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ret = _gssapi_msg_order_check(context_handle->order, seq_number);
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if (ret) {
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return ret;
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}
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return GSS_S_COMPLETE;
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}
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#endif
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static OM_uint32
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verify_mic_des3
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(OM_uint32 * minor_status,
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const gsskrb5_ctx context_handle,
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krb5_context context,
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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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krb5_keyblock *key,
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char *type
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)
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{
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u_char *p;
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u_char *seq;
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uint32_t seq_number;
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OM_uint32 ret;
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krb5_crypto crypto;
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krb5_data seq_data;
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int cmp, docompat;
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Checksum csum;
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char *tmp;
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char ivec[8];
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p = token_buffer->value;
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ret = _gsskrb5_verify_header (&p,
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token_buffer->length,
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type,
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GSS_KRB5_MECHANISM);
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if (ret)
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return ret;
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if (memcmp(p, "\x04\x00", 2) != 0) /* SGN_ALG = HMAC SHA1 DES3-KD */
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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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ret = krb5_crypto_init(context, key,
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ETYPE_DES3_CBC_NONE, &crypto);
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if (ret){
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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/* verify sequence number */
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docompat = 0;
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retry:
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if (docompat)
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memset(ivec, 0, 8);
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else
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memcpy(ivec, p + 8, 8);
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ret = krb5_decrypt_ivec (context,
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crypto,
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KRB5_KU_USAGE_SEQ,
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p, 8, &seq_data, ivec);
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if (ret) {
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if (docompat++) {
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krb5_crypto_destroy (context, crypto);
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*minor_status = ret;
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return GSS_S_FAILURE;
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} else
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goto retry;
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}
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if (seq_data.length != 8) {
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krb5_data_free (&seq_data);
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if (docompat++) {
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krb5_crypto_destroy (context, crypto);
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return GSS_S_BAD_MIC;
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} else
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goto retry;
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}
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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seq = seq_data.data;
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_gsskrb5_decode_om_uint32(seq, &seq_number);
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if (context_handle->more_flags & LOCAL)
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cmp = ct_memcmp(&seq[4], "\xff\xff\xff\xff", 4);
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else
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cmp = ct_memcmp(&seq[4], "\x00\x00\x00\x00", 4);
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krb5_data_free (&seq_data);
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if (cmp != 0) {
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krb5_crypto_destroy (context, crypto);
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*minor_status = 0;
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return GSS_S_BAD_MIC;
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}
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ret = _gssapi_msg_order_check(context_handle->order, seq_number);
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if (ret) {
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krb5_crypto_destroy (context, crypto);
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*minor_status = 0;
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return ret;
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}
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/* verify checksum */
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tmp = malloc (message_buffer->length + 8);
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if (tmp == NULL) {
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krb5_crypto_destroy (context, crypto);
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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memcpy (tmp, p - 8, 8);
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memcpy (tmp + 8, message_buffer->value, message_buffer->length);
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csum.cksumtype = CKSUMTYPE_HMAC_SHA1_DES3;
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csum.checksum.length = 20;
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csum.checksum.data = p + 8;
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ret = krb5_verify_checksum (context, crypto,
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KRB5_KU_USAGE_SIGN,
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tmp, message_buffer->length + 8,
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&csum);
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free (tmp);
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if (ret) {
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krb5_crypto_destroy (context, crypto);
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*minor_status = ret;
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return GSS_S_BAD_MIC;
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}
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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krb5_crypto_destroy (context, crypto);
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return GSS_S_COMPLETE;
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}
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OM_uint32
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_gsskrb5_verify_mic_internal
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(OM_uint32 * minor_status,
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const gsskrb5_ctx ctx,
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krb5_context context,
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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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char * type
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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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if (ctx->more_flags & IS_CFX)
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return _gssapi_verify_mic_cfx (minor_status, ctx,
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context, message_buffer, token_buffer,
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qop_state);
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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ret = _gsskrb5i_get_token_key(ctx, context, &key);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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*minor_status = 0;
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krb5_enctype_to_keytype (context, key->keytype, &keytype);
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switch (keytype) {
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case KEYTYPE_DES :
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#ifdef HEIM_WEAK_CRYPTO
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ret = verify_mic_des (minor_status, ctx, context,
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message_buffer, token_buffer, qop_state, key,
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type);
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#else
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ret = GSS_S_FAILURE;
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#endif
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break;
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case KEYTYPE_DES3 :
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ret = verify_mic_des3 (minor_status, ctx, context,
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message_buffer, token_buffer, qop_state, key,
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type);
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break;
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case KEYTYPE_ARCFOUR :
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case KEYTYPE_ARCFOUR_56 :
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ret = _gssapi_verify_mic_arcfour (minor_status, ctx,
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context,
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message_buffer, token_buffer,
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qop_state, key, type);
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break;
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default :
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abort();
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}
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krb5_free_keyblock (context, key);
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return ret;
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}
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OM_uint32
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_gsskrb5_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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krb5_context context;
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OM_uint32 ret;
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GSSAPI_KRB5_INIT (&context);
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if (qop_state != NULL)
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*qop_state = GSS_C_QOP_DEFAULT;
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ret = _gsskrb5_verify_mic_internal(minor_status,
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(gsskrb5_ctx)context_handle,
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context,
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message_buffer, token_buffer,
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qop_state, "\x01\x01");
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return ret;
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}
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