diff options
Diffstat (limited to 'crypto/heimdal/lib/gssapi/krb5/8003.c')
| -rw-r--r-- | crypto/heimdal/lib/gssapi/krb5/8003.c | 248 |
1 files changed, 248 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/gssapi/krb5/8003.c b/crypto/heimdal/lib/gssapi/krb5/8003.c new file mode 100644 index 0000000..619cbf9 --- /dev/null +++ b/crypto/heimdal/lib/gssapi/krb5/8003.c @@ -0,0 +1,248 @@ +/* + * Copyright (c) 1997 - 2003 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 "krb5/gsskrb5_locl.h" + +RCSID("$Id: 8003.c 18334 2006-10-07 22:16:04Z lha $"); + +krb5_error_code +_gsskrb5_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; +} + +krb5_error_code +_gsskrb5_encode_be_om_uint32(OM_uint32 n, u_char *p) +{ + p[0] = (n >> 24) & 0xFF; + p[1] = (n >> 16) & 0xFF; + p[2] = (n >> 8) & 0xFF; + p[3] = (n >> 0) & 0xFF; + return 0; +} + +krb5_error_code +_gsskrb5_decode_om_uint32(const void *ptr, OM_uint32 *n) +{ + const u_char *p = ptr; + *n = (p[0] << 0) | (p[1] << 8) | (p[2] << 16) | (p[3] << 24); + return 0; +} + +krb5_error_code +_gsskrb5_decode_be_om_uint32(const void *ptr, OM_uint32 *n) +{ + const u_char *p = ptr; + *n = (p[0] <<24) | (p[1] << 16) | (p[2] << 8) | (p[3] << 0); + return 0; +} + +static krb5_error_code +hash_input_chan_bindings (const gss_channel_bindings_t b, + u_char *p) +{ + u_char num[4]; + MD5_CTX md5; + + MD5_Init(&md5); + _gsskrb5_encode_om_uint32 (b->initiator_addrtype, num); + MD5_Update (&md5, num, sizeof(num)); + _gsskrb5_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); + _gsskrb5_encode_om_uint32 (b->acceptor_addrtype, num); + MD5_Update (&md5, num, sizeof(num)); + _gsskrb5_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); + _gsskrb5_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_Final (p, &md5); + return 0; +} + +/* + * create a checksum over the chanel bindings in + * `input_chan_bindings', `flags' and `fwd_data' and return it in + * `result' + */ + +OM_uint32 +_gsskrb5_create_8003_checksum ( + OM_uint32 *minor_status, + const gss_channel_bindings_t input_chan_bindings, + OM_uint32 flags, + const krb5_data *fwd_data, + Checksum *result) +{ + u_char *p; + + /* + * see rfc1964 (section 1.1.1 (Initial Token), and the checksum value + * field's format) */ + result->cksumtype = CKSUMTYPE_GSSAPI; + if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) + result->checksum.length = 24 + 4 + fwd_data->length; + else + result->checksum.length = 24; + result->checksum.data = malloc (result->checksum.length); + if (result->checksum.data == NULL) { + *minor_status = ENOMEM; + return GSS_S_FAILURE; + } + + p = result->checksum.data; + _gsskrb5_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; + _gsskrb5_encode_om_uint32 (flags, p); + p += 4; + + if (fwd_data->length > 0 && (flags & GSS_C_DELEG_FLAG)) { + + *p++ = (1 >> 0) & 0xFF; /* DlgOpt */ /* == 1 */ + *p++ = (1 >> 8) & 0xFF; /* DlgOpt */ /* == 0 */ + *p++ = (fwd_data->length >> 0) & 0xFF; /* Dlgth */ + *p++ = (fwd_data->length >> 8) & 0xFF; /* Dlgth */ + memcpy(p, (unsigned char *) fwd_data->data, fwd_data->length); + + p += fwd_data->length; + } + + return GSS_S_COMPLETE; +} + +/* + * verify the checksum in `cksum' over `input_chan_bindings' + * returning `flags' and `fwd_data' + */ + +OM_uint32 +_gsskrb5_verify_8003_checksum( + OM_uint32 *minor_status, + const gss_channel_bindings_t input_chan_bindings, + const Checksum *cksum, + OM_uint32 *flags, + krb5_data *fwd_data) +{ + unsigned char hash[16]; + unsigned char *p; + OM_uint32 length; + int DlgOpt; + static unsigned char zeros[16]; + + if (cksum == NULL) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + + /* XXX should handle checksums > 24 bytes */ + if(cksum->cksumtype != CKSUMTYPE_GSSAPI || cksum->checksum.length < 24) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + + p = cksum->checksum.data; + _gsskrb5_decode_om_uint32(p, &length); + if(length != sizeof(hash)) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + + p += 4; + + if (input_chan_bindings != GSS_C_NO_CHANNEL_BINDINGS + && memcmp(p, zeros, sizeof(zeros)) != 0) { + if(hash_input_chan_bindings(input_chan_bindings, hash) != 0) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + if(memcmp(hash, p, sizeof(hash)) != 0) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + } + + p += sizeof(hash); + + _gsskrb5_decode_om_uint32(p, flags); + p += 4; + + if (cksum->checksum.length > 24 && (*flags & GSS_C_DELEG_FLAG)) { + if(cksum->checksum.length < 28) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + + DlgOpt = (p[0] << 0) | (p[1] << 8); + p += 2; + if (DlgOpt != 1) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + + fwd_data->length = (p[0] << 0) | (p[1] << 8); + p += 2; + if(cksum->checksum.length < 28 + fwd_data->length) { + *minor_status = 0; + return GSS_S_BAD_BINDINGS; + } + fwd_data->data = malloc(fwd_data->length); + if (fwd_data->data == NULL) { + *minor_status = ENOMEM; + return GSS_S_FAILURE; + } + memcpy(fwd_data->data, p, fwd_data->length); + } + + return GSS_S_COMPLETE; +} |
