diff options
Diffstat (limited to 'crypto/heimdal/lib/gssapi/8003.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/8003.c | 152 |
1 files changed, 152 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/8003.c b/crypto/heimdal/lib/gssapi/8003.c new file mode 100644 index 0000000..61fe215 --- /dev/null +++ b/crypto/heimdal/lib/gssapi/8003.c @@ -0,0 +1,152 @@ +/* + * Copyright (c) 1997, 1998 Kungliga Tekniska Högskolan + * (Royal Institute of Technology, Stockholm, Sweden). + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "gssapi_locl.h" + +RCSID("$Id: 8003.c,v 1.5 1999/12/02 17:05:03 joda Exp $"); + +static krb5_error_code +encode_om_uint32(OM_uint32 n, u_char *p) +{ + p[0] = (n >> 0) & 0xFF; + p[1] = (n >> 8) & 0xFF; + p[2] = (n >> 16) & 0xFF; + p[3] = (n >> 24) & 0xFF; + return 0; +} + +static krb5_error_code +decode_om_uint32(u_char *p, OM_uint32 *n) +{ + *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); + return 0; +} + +static krb5_error_code +hash_input_chan_bindings (const gss_channel_bindings_t b, + u_char *p) +{ + u_char num[4]; + struct md5 md5; + + md5_init(&md5); + encode_om_uint32 (b->initiator_addrtype, num); + md5_update (&md5, num, sizeof(num)); + encode_om_uint32 (b->initiator_address.length, num); + md5_update (&md5, num, sizeof(num)); + if (b->initiator_address.length) + md5_update (&md5, + b->initiator_address.value, + b->initiator_address.length); + encode_om_uint32 (b->acceptor_addrtype, num); + md5_update (&md5, num, sizeof(num)); + encode_om_uint32 (b->acceptor_address.length, num); + md5_update (&md5, num, sizeof(num)); + if (b->acceptor_address.length) + md5_update (&md5, + b->acceptor_address.value, + b->acceptor_address.length); + encode_om_uint32 (b->application_data.length, num); + md5_update (&md5, num, sizeof(num)); + if (b->application_data.length) + md5_update (&md5, + b->application_data.value, + b->application_data.length); + md5_finito (&md5, p); + return 0; +} + +krb5_error_code +gssapi_krb5_create_8003_checksum ( + const gss_channel_bindings_t input_chan_bindings, + OM_uint32 flags, + Checksum *result) +{ + u_char *p; + + result->cksumtype = 0x8003; + result->checksum.length = 24; + result->checksum.data = malloc (result->checksum.length); + if (result->checksum.data == NULL) + return ENOMEM; + + p = result->checksum.data; + encode_om_uint32 (16, p); + p += 4; + if (input_chan_bindings == GSS_C_NO_CHANNEL_BINDINGS) { + memset (p, 0, 16); + } else { + hash_input_chan_bindings (input_chan_bindings, p); + } + p += 16; + encode_om_uint32 (flags, p); + p += 4; + if (p - (u_char *)result->checksum.data != result->checksum.length) + abort (); + return 0; +} + +krb5_error_code +gssapi_krb5_verify_8003_checksum( + const gss_channel_bindings_t input_chan_bindings, + Checksum *cksum, + OM_uint32 *flags) +{ + unsigned char hash[16]; + unsigned char *p; + OM_uint32 length; + + /* XXX should handle checksums > 24 bytes */ + if(cksum->cksumtype != 0x8003 || cksum->checksum.length != 24) + return GSS_S_BAD_BINDINGS; + + p = cksum->checksum.data; + decode_om_uint32(p, &length); + if(length != sizeof(hash)) + return GSS_S_FAILURE; + + p += 4; + + if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS) { + if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) + return GSS_S_FAILURE; + if(memcmp(hash, p, sizeof(hash)) != 0) + return GSS_S_FAILURE; + } + + p += sizeof(hash); + + decode_om_uint32(p, flags); + + return 0; +} |
