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/*
* 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_locl.h>
RCSID("$Id: build_auth.c 17033 2006-04-10 08:53:21Z lha $");
static krb5_error_code
make_etypelist(krb5_context context,
krb5_authdata **auth_data)
{
EtypeList etypes;
krb5_error_code ret;
krb5_authdata ad;
u_char *buf;
size_t len;
size_t buf_size;
ret = krb5_init_etype(context, &etypes.len, &etypes.val, NULL);
if (ret)
return ret;
ASN1_MALLOC_ENCODE(EtypeList, buf, buf_size, &etypes, &len, ret);
if (ret) {
free_EtypeList(&etypes);
return ret;
}
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
free_EtypeList(&etypes);
ALLOC_SEQ(&ad, 1);
if (ad.val == NULL) {
free(buf);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
ad.val[0].ad_type = KRB5_AUTHDATA_GSS_API_ETYPE_NEGOTIATION;
ad.val[0].ad_data.length = len;
ad.val[0].ad_data.data = buf;
ASN1_MALLOC_ENCODE(AD_IF_RELEVANT, buf, buf_size, &ad, &len, ret);
if (ret) {
free_AuthorizationData(&ad);
return ret;
}
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
free_AuthorizationData(&ad);
ALLOC(*auth_data, 1);
if (*auth_data == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
ALLOC_SEQ(*auth_data, 1);
if ((*auth_data)->val == NULL) {
free(buf);
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
(*auth_data)->val[0].ad_type = KRB5_AUTHDATA_IF_RELEVANT;
(*auth_data)->val[0].ad_data.length = len;
(*auth_data)->val[0].ad_data.data = buf;
return 0;
}
krb5_error_code KRB5_LIB_FUNCTION
krb5_build_authenticator (krb5_context context,
krb5_auth_context auth_context,
krb5_enctype enctype,
krb5_creds *cred,
Checksum *cksum,
Authenticator **auth_result,
krb5_data *result,
krb5_key_usage usage)
{
Authenticator *auth;
u_char *buf = NULL;
size_t buf_size;
size_t len;
krb5_error_code ret;
krb5_crypto crypto;
auth = calloc(1, sizeof(*auth));
if (auth == NULL) {
krb5_set_error_string(context, "malloc: out of memory");
return ENOMEM;
}
auth->authenticator_vno = 5;
copy_Realm(&cred->client->realm, &auth->crealm);
copy_PrincipalName(&cred->client->name, &auth->cname);
krb5_us_timeofday (context, &auth->ctime, &auth->cusec);
ret = krb5_auth_con_getlocalsubkey(context, auth_context, &auth->subkey);
if(ret)
goto fail;
if (auth_context->flags & KRB5_AUTH_CONTEXT_DO_SEQUENCE) {
if(auth_context->local_seqnumber == 0)
krb5_generate_seq_number (context,
&cred->session,
&auth_context->local_seqnumber);
ALLOC(auth->seq_number, 1);
if(auth->seq_number == NULL) {
ret = ENOMEM;
goto fail;
}
*auth->seq_number = auth_context->local_seqnumber;
} else
auth->seq_number = NULL;
auth->authorization_data = NULL;
auth->cksum = cksum;
if (cksum != NULL && cksum->cksumtype == CKSUMTYPE_GSSAPI) {
/*
* This is not GSS-API specific, we only enable it for
* GSS for now
*/
ret = make_etypelist(context, &auth->authorization_data);
if (ret)
goto fail;
}
/* XXX - Copy more to auth_context? */
auth_context->authenticator->ctime = auth->ctime;
auth_context->authenticator->cusec = auth->cusec;
ASN1_MALLOC_ENCODE(Authenticator, buf, buf_size, auth, &len, ret);
if (ret)
goto fail;
if(buf_size != len)
krb5_abortx(context, "internal error in ASN.1 encoder");
ret = krb5_crypto_init(context, &cred->session, enctype, &crypto);
if (ret)
goto fail;
ret = krb5_encrypt (context,
crypto,
usage /* KRB5_KU_AP_REQ_AUTH */,
buf + buf_size - len,
len,
result);
krb5_crypto_destroy(context, crypto);
if (ret)
goto fail;
free (buf);
if (auth_result)
*auth_result = auth;
else {
/* Don't free the `cksum', it's allocated by the caller */
auth->cksum = NULL;
free_Authenticator (auth);
free (auth);
}
return ret;
fail:
free_Authenticator (auth);
free (auth);
free (buf);
return ret;
}
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