diff options
Diffstat (limited to 'crypto/heimdal/lib/krb5/rd_safe.c')
| -rw-r--r-- | crypto/heimdal/lib/krb5/rd_safe.c | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/crypto/heimdal/lib/krb5/rd_safe.c b/crypto/heimdal/lib/krb5/rd_safe.c new file mode 100644 index 000000000000..aebf215b266b --- /dev/null +++ b/crypto/heimdal/lib/krb5/rd_safe.c @@ -0,0 +1,172 @@ +/* + * Copyright (c) 1997 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_locl.h> + +RCSID("$Id: rd_safe.c,v 1.18 1999/12/02 17:05:12 joda Exp $"); + +static krb5_error_code +verify_checksum(krb5_context context, + krb5_auth_context auth_context, + KRB_SAFE *safe) +{ + krb5_error_code ret; + u_char *buf; + size_t buf_size; + size_t len; + Checksum c; + krb5_crypto crypto; + + c = safe->cksum; + safe->cksum.cksumtype = 0; + safe->cksum.checksum.data = NULL; + safe->cksum.checksum.length = 0; + + + buf_size = length_KRB_SAFE(safe); + buf = malloc(buf_size); + + if (buf == NULL) { + ret = ENOMEM; + goto out; + } + + ret = encode_KRB_SAFE (buf + buf_size - 1, + buf_size, + safe, + &len); + krb5_crypto_init(context, auth_context->keyblock, 0, &crypto); + ret = krb5_verify_checksum (context, + crypto, + KRB5_KU_KRB_SAFE_CKSUM, + buf + buf_size - len, + len, + &c); + krb5_crypto_destroy(context, crypto); +out: + safe->cksum = c; + free (buf); + return ret; +} + +krb5_error_code +krb5_rd_safe(krb5_context context, + krb5_auth_context auth_context, + const krb5_data *inbuf, + krb5_data *outbuf, + /*krb5_replay_data*/ void *outdata) +{ + krb5_error_code ret; + KRB_SAFE safe; + size_t len; + + ret = decode_KRB_SAFE (inbuf->data, inbuf->length, &safe, &len); + if (ret) + return ret; + if (safe.pvno != 5) { + ret = KRB5KRB_AP_ERR_BADVERSION; + goto failure; + } + if (safe.msg_type != krb_safe) { + ret = KRB5KRB_AP_ERR_MSG_TYPE; + goto failure; + } + if (!krb5_checksum_is_keyed(context, safe.cksum.cksumtype) + || !krb5_checksum_is_collision_proof(context, safe.cksum.cksumtype)) { + ret = KRB5KRB_AP_ERR_INAPP_CKSUM; + goto failure; + } + + /* check sender address */ + + if (safe.safe_body.s_address + && auth_context->remote_address + && !krb5_address_compare (context, + auth_context->remote_address, + safe.safe_body.s_address)) { + ret = KRB5KRB_AP_ERR_BADADDR; + goto failure; + } + + /* check receiver address */ + + if (safe.safe_body.r_address + && auth_context->local_address + && !krb5_address_compare (context, + auth_context->local_address, + safe.safe_body.r_address)) { + ret = KRB5KRB_AP_ERR_BADADDR; + goto failure; + } + + /* check timestamp */ + if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_TIME) { + int32_t sec; + + krb5_timeofday (context, &sec); + + if (safe.safe_body.timestamp == NULL || + safe.safe_body.usec == NULL || + abs(*safe.safe_body.timestamp - sec) > context->max_skew) { + ret = KRB5KRB_AP_ERR_SKEW; + goto failure; + } + } + /* XXX - check replay cache */ + + /* check sequence number */ + if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) { + if (safe.safe_body.seq_number == NULL || + *safe.safe_body.seq_number != ++auth_context->remote_seqnumber) { + ret = KRB5KRB_AP_ERR_BADORDER; + goto failure; + } + } + + ret = verify_checksum (context, auth_context, &safe); + if (ret) + goto failure; + + outbuf->length = safe.safe_body.user_data.length; + outbuf->data = malloc(outbuf->length); + if (outbuf->data == NULL) { + ret = ENOMEM; + goto failure; + } + memcpy (outbuf->data, safe.safe_body.user_data.data, outbuf->length); + free_KRB_SAFE (&safe); + return 0; +failure: + free_KRB_SAFE (&safe); + return ret; +} |