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Current File : //usr/src/crypto/heimdal/lib/krb5/build_auth.c |
/* * 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; }