624 lines
16 KiB
C
624 lines
16 KiB
C
/*
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* Copyright (c) 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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/*
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* Implements draft-brezak-win2k-krb-rc4-hmac-04.txt
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*/
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RCSID("$Id: arcfour.c,v 1.12.2.3 2003/09/19 15:15:11 lha Exp $");
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static krb5_error_code
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arcfour_mic_key(krb5_context context, krb5_keyblock *key,
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void *cksum_data, size_t cksum_size,
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void *key6_data, size_t key6_size)
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{
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krb5_error_code ret;
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Checksum cksum_k5;
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krb5_keyblock key5;
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char k5_data[16];
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Checksum cksum_k6;
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char T[4];
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memset(T, 0, 4);
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cksum_k5.checksum.data = k5_data;
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cksum_k5.checksum.length = sizeof(k5_data);
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if (key->keytype == KEYTYPE_ARCFOUR_56) {
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char L40[14] = "fortybits";
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memcpy(L40 + 10, T, sizeof(T));
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ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
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L40, 14, 0, key, &cksum_k5);
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memset(&k5_data[7], 0xAB, 9);
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} else {
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ret = krb5_hmac(context, CKSUMTYPE_RSA_MD5,
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T, 4, 0, key, &cksum_k5);
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}
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if (ret)
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return ret;
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key5.keytype = KEYTYPE_ARCFOUR;
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key5.keyvalue = cksum_k5.checksum;
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cksum_k6.checksum.data = key6_data;
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cksum_k6.checksum.length = key6_size;
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return krb5_hmac(context, CKSUMTYPE_RSA_MD5,
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cksum_data, cksum_size, 0, &key5, &cksum_k6);
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}
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static krb5_error_code
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arcfour_mic_cksum(krb5_keyblock *key, unsigned usage,
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u_char *sgn_cksum, size_t sgn_cksum_sz,
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const char *v1, size_t l1,
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const void *v2, size_t l2,
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const void *v3, size_t l3)
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{
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Checksum CKSUM;
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u_char *ptr;
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size_t len;
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krb5_crypto crypto;
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krb5_error_code ret;
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assert(sgn_cksum_sz == 8);
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len = l1 + l2 + l3;
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ptr = malloc(len);
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if (ptr == NULL)
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return ENOMEM;
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memcpy(ptr, v1, l1);
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memcpy(ptr + l1, v2, l2);
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memcpy(ptr + l1 + l2, v3, l3);
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ret = krb5_crypto_init(gssapi_krb5_context, key, 0, &crypto);
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if (ret) {
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free(ptr);
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return ret;
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}
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ret = krb5_create_checksum(gssapi_krb5_context,
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crypto,
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usage,
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0,
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ptr, len,
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&CKSUM);
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free(ptr);
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if (ret == 0) {
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memcpy(sgn_cksum, CKSUM.checksum.data, sgn_cksum_sz);
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free_Checksum(&CKSUM);
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}
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krb5_crypto_destroy(gssapi_krb5_context, crypto);
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return ret;
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}
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OM_uint32
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_gssapi_get_mic_arcfour(OM_uint32 * minor_status,
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const gss_ctx_id_t context_handle,
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gss_qop_t qop_req,
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const gss_buffer_t message_buffer,
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gss_buffer_t message_token,
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krb5_keyblock *key)
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{
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krb5_error_code ret;
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int32_t seq_number;
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size_t len, total_len;
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u_char k6_data[16], *p0, *p;
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RC4_KEY rc4_key;
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gssapi_krb5_encap_length (22, &len, &total_len);
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message_token->length = total_len;
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message_token->value = malloc (total_len);
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if (message_token->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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p0 = _gssapi_make_mech_header(message_token->value,
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len);
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p = p0;
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*p++ = 0x01; /* TOK_ID */
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*p++ = 0x01;
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*p++ = 0x11; /* SGN_ALG */
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*p++ = 0x00;
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*p++ = 0xff; /* Filler */
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*p++ = 0xff;
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*p++ = 0xff;
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*p++ = 0xff;
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p = NULL;
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ret = arcfour_mic_cksum(key, KRB5_KU_USAGE_SIGN,
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p0 + 16, 8, /* SGN_CKSUM */
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p0, 8, /* TOK_ID, SGN_ALG, Filer */
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message_buffer->value, message_buffer->length,
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NULL, 0);
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if (ret) {
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gss_release_buffer(minor_status, message_token);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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ret = arcfour_mic_key(gssapi_krb5_context, key,
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p0 + 16, 8, /* SGN_CKSUM */
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k6_data, sizeof(k6_data));
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if (ret) {
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gss_release_buffer(minor_status, message_token);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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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 = p0 + 8; /* SND_SEQ */
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gssapi_encode_be_om_uint32(seq_number, p);
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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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memset (p + 4, (context_handle->more_flags & LOCAL) ? 0 : 0xff, 4);
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RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
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RC4 (&rc4_key, 8, p, p);
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memset(&rc4_key, 0, sizeof(rc4_key));
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memset(k6_data, 0, sizeof(k6_data));
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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
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_gssapi_verify_mic_arcfour(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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krb5_keyblock *key,
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char *type)
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{
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krb5_error_code ret;
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int32_t seq_number, seq_number2;
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OM_uint32 omret;
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char cksum_data[8], k6_data[16], SND_SEQ[8];
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u_char *p;
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int cmp;
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if (qop_state)
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*qop_state = 0;
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p = token_buffer->value;
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omret = gssapi_krb5_verify_header (&p,
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token_buffer->length,
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type);
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if (omret)
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return omret;
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if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
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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 = arcfour_mic_cksum(key, KRB5_KU_USAGE_SIGN,
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cksum_data, sizeof(cksum_data),
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p - 8, 8,
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message_buffer->value, message_buffer->length,
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NULL, 0);
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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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ret = arcfour_mic_key(gssapi_krb5_context, key,
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cksum_data, sizeof(cksum_data),
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k6_data, sizeof(k6_data));
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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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cmp = memcmp(cksum_data, p + 8, 8);
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if (cmp) {
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*minor_status = 0;
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return GSS_S_BAD_MIC;
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}
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{
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RC4_KEY rc4_key;
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RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
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RC4 (&rc4_key, 8, p, SND_SEQ);
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memset(&rc4_key, 0, sizeof(rc4_key));
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memset(k6_data, 0, sizeof(k6_data));
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}
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gssapi_decode_be_om_uint32(SND_SEQ, &seq_number);
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if (context_handle->more_flags & LOCAL)
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cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4);
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else
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cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4);
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memset(SND_SEQ, 0, sizeof(SND_SEQ));
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if (cmp != 0) {
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*minor_status = 0;
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return GSS_S_BAD_MIC;
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}
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krb5_auth_con_getlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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&seq_number2);
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if (seq_number != seq_number2) {
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*minor_status = 0;
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return GSS_S_UNSEQ_TOKEN;
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}
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krb5_auth_con_setlocalseqnumber (gssapi_krb5_context,
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context_handle->auth_context,
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++seq_number2);
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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
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_gssapi_wrap_arcfour(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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u_char Klocaldata[16], k6_data[16], *p, *p0;
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size_t len, total_len, datalen;
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krb5_keyblock Klocal;
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krb5_error_code ret;
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int32_t seq_number;
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if (conf_state)
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*conf_state = 0;
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datalen = input_message_buffer->length + 1 /* padding */;
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len = datalen + 30;
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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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p0 = _gssapi_make_mech_header(output_message_buffer->value,
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len);
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p = p0;
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*p++ = 0x02; /* TOK_ID */
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*p++ = 0x01;
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*p++ = 0x11; /* SGN_ALG */
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*p++ = 0x00;
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if (conf_req_flag) {
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*p++ = 0x10; /* SEAL_ALG */
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*p++ = 0x00;
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} else {
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*p++ = 0xff; /* SEAL_ALG */
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*p++ = 0xff;
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}
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*p++ = 0xff; /* Filler */
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*p++ = 0xff;
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p = NULL;
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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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gssapi_encode_be_om_uint32(seq_number, p0 + 8);
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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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memset (p0 + 8 + 4,
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(context_handle->more_flags & LOCAL) ? 0 : 0xff,
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4);
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krb5_generate_random_block(p0 + 24, 8); /* fill in Confounder */
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/* p points to data */
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p = p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE;
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memcpy(p, input_message_buffer->value, input_message_buffer->length);
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p[input_message_buffer->length] = 1; /* PADDING */
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ret = arcfour_mic_cksum(key, KRB5_KU_USAGE_SEAL,
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p0 + 16, 8, /* SGN_CKSUM */
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p0, 8, /* TOK_ID, SGN_ALG, SEAL_ALG, Filler */
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p0 + 24, 8, /* Confounder */
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p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
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datalen);
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if (ret) {
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*minor_status = ret;
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gss_release_buffer(minor_status, output_message_buffer);
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return GSS_S_FAILURE;
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}
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{
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int i;
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Klocal.keytype = key->keytype;
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Klocal.keyvalue.data = Klocaldata;
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Klocal.keyvalue.length = sizeof(Klocaldata);
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for (i = 0; i < 16; i++)
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Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
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}
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ret = arcfour_mic_key(gssapi_krb5_context, &Klocal,
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p0 + 8, 4, /* SND_SEQ */
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k6_data, sizeof(k6_data));
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memset(Klocaldata, 0, sizeof(Klocaldata));
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if (ret) {
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gss_release_buffer(minor_status, output_message_buffer);
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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if(conf_req_flag) {
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RC4_KEY rc4_key;
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RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
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/* XXX ? */
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RC4 (&rc4_key, 8 + datalen, p0 + 24, p0 + 24); /* Confounder + data */
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memset(&rc4_key, 0, sizeof(rc4_key));
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}
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memset(k6_data, 0, sizeof(k6_data));
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ret = arcfour_mic_key(gssapi_krb5_context, key,
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p0 + 16, 8, /* SGN_CKSUM */
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k6_data, sizeof(k6_data));
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if (ret) {
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gss_release_buffer(minor_status, output_message_buffer);
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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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RC4_KEY rc4_key;
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RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
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RC4 (&rc4_key, 8, p0 + 8, p0 + 8); /* SND_SEQ */
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memset(&rc4_key, 0, sizeof(rc4_key));
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memset(k6_data, 0, sizeof(k6_data));
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}
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if (conf_state)
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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 _gssapi_unwrap_arcfour(OM_uint32 *minor_status,
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const gss_ctx_id_t context_handle,
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const gss_buffer_t input_message_buffer,
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gss_buffer_t output_message_buffer,
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int *conf_state,
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gss_qop_t *qop_state,
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krb5_keyblock *key)
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{
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u_char Klocaldata[16];
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krb5_keyblock Klocal;
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krb5_error_code ret;
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int32_t seq_number, seq_number2;
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size_t datalen;
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OM_uint32 omret;
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char k6_data[16], SND_SEQ[8], Confounder[8];
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char cksum_data[8];
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u_char *p, *p0;
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int cmp;
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int conf_flag;
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size_t padlen;
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if (conf_state)
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*conf_state = 0;
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if (qop_state)
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*qop_state = 0;
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p0 = input_message_buffer->value;
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omret = _gssapi_verify_mech_header(&p0,
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input_message_buffer->length);
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if (omret)
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return omret;
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p = p0;
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datalen = input_message_buffer->length -
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(p - ((u_char *)input_message_buffer->value)) -
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GSS_ARCFOUR_WRAP_TOKEN_SIZE;
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if (memcmp(p, "\x02\x01", 2) != 0)
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return GSS_S_BAD_SIG;
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p += 2;
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if (memcmp(p, "\x11\x00", 2) != 0) /* SGN_ALG = HMAC MD5 ARCFOUR */
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return GSS_S_BAD_SIG;
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p += 2;
|
|
|
|
if (memcmp (p, "\x10\x00", 2) == 0)
|
|
conf_flag = 1;
|
|
else if (memcmp (p, "\xff\xff", 2) == 0)
|
|
conf_flag = 0;
|
|
else
|
|
return GSS_S_BAD_SIG;
|
|
|
|
p += 2;
|
|
if (memcmp (p, "\xff\xff", 2) != 0)
|
|
return GSS_S_BAD_MIC;
|
|
p = NULL;
|
|
|
|
ret = arcfour_mic_key(gssapi_krb5_context, key,
|
|
p0 + 16, 8, /* SGN_CKSUM */
|
|
k6_data, sizeof(k6_data));
|
|
if (ret) {
|
|
*minor_status = ret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
{
|
|
RC4_KEY rc4_key;
|
|
|
|
RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
|
|
RC4 (&rc4_key, 8, p0 + 8, SND_SEQ); /* SND_SEQ */
|
|
memset(&rc4_key, 0, sizeof(rc4_key));
|
|
memset(k6_data, 0, sizeof(k6_data));
|
|
}
|
|
|
|
gssapi_decode_be_om_uint32(SND_SEQ, &seq_number);
|
|
|
|
if (context_handle->more_flags & LOCAL)
|
|
cmp = memcmp(&SND_SEQ[4], "\xff\xff\xff\xff", 4);
|
|
else
|
|
cmp = memcmp(&SND_SEQ[4], "\x00\x00\x00\x00", 4);
|
|
|
|
if (cmp != 0) {
|
|
*minor_status = 0;
|
|
return GSS_S_BAD_MIC;
|
|
}
|
|
|
|
{
|
|
int i;
|
|
|
|
Klocal.keytype = key->keytype;
|
|
Klocal.keyvalue.data = Klocaldata;
|
|
Klocal.keyvalue.length = sizeof(Klocaldata);
|
|
|
|
for (i = 0; i < 16; i++)
|
|
Klocaldata[i] = ((u_char *)key->keyvalue.data)[i] ^ 0xF0;
|
|
}
|
|
ret = arcfour_mic_key(gssapi_krb5_context, &Klocal,
|
|
SND_SEQ, 4,
|
|
k6_data, sizeof(k6_data));
|
|
memset(Klocaldata, 0, sizeof(Klocaldata));
|
|
if (ret) {
|
|
*minor_status = ret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
output_message_buffer->value = malloc(datalen);
|
|
if (output_message_buffer->value == NULL) {
|
|
*minor_status = ENOMEM;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
output_message_buffer->length = datalen;
|
|
|
|
if(conf_flag) {
|
|
RC4_KEY rc4_key;
|
|
|
|
RC4_set_key (&rc4_key, sizeof(k6_data), k6_data);
|
|
RC4 (&rc4_key, 8, p0 + 24, Confounder); /* Confounder */
|
|
RC4 (&rc4_key, datalen, p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
|
|
output_message_buffer->value);
|
|
memset(&rc4_key, 0, sizeof(rc4_key));
|
|
} else {
|
|
memcpy(Confounder, p0 + 24, 8); /* Confounder */
|
|
memcpy(output_message_buffer->value,
|
|
p0 + GSS_ARCFOUR_WRAP_TOKEN_SIZE,
|
|
datalen);
|
|
}
|
|
memset(k6_data, 0, sizeof(k6_data));
|
|
|
|
ret = _gssapi_verify_pad(output_message_buffer, datalen, &padlen);
|
|
if (ret) {
|
|
gss_release_buffer(minor_status, output_message_buffer);
|
|
*minor_status = 0;
|
|
return ret;
|
|
}
|
|
output_message_buffer->length -= padlen;
|
|
|
|
ret = arcfour_mic_cksum(key, KRB5_KU_USAGE_SEAL,
|
|
cksum_data, sizeof(cksum_data),
|
|
p0, 8,
|
|
Confounder, sizeof(Confounder),
|
|
output_message_buffer->value,
|
|
output_message_buffer->length + padlen);
|
|
if (ret) {
|
|
gss_release_buffer(minor_status, output_message_buffer);
|
|
*minor_status = ret;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
|
|
cmp = memcmp(cksum_data, p0 + 16, 8); /* SGN_CKSUM */
|
|
if (cmp) {
|
|
gss_release_buffer(minor_status, output_message_buffer);
|
|
*minor_status = 0;
|
|
return GSS_S_BAD_MIC;
|
|
}
|
|
|
|
krb5_auth_getremoteseqnumber (gssapi_krb5_context,
|
|
context_handle->auth_context,
|
|
&seq_number2);
|
|
|
|
if (seq_number != seq_number2) {
|
|
*minor_status = 0;
|
|
return GSS_S_UNSEQ_TOKEN;
|
|
}
|
|
|
|
krb5_auth_con_setremoteseqnumber (gssapi_krb5_context,
|
|
context_handle->auth_context,
|
|
++seq_number2);
|
|
|
|
if (conf_state)
|
|
*conf_state = conf_flag;
|
|
|
|
*minor_status = 0;
|
|
return GSS_S_COMPLETE;
|
|
}
|