1d9072f026
lib/krb5/crypto.c was a large, monolithic block of code which made it very difficult to selectively enable and disable particular alogrithms. Reorganise crypto.c into individual files for each encryption and salt time, and place the structures which tie everything together into their own file (crypto-algs.c) Add a non-installed library (librfc3961) and test program (test_rfc3961) which builds a minimal rfc3961 crypto library, and checks that it is usable.
293 lines
8.1 KiB
C
293 lines
8.1 KiB
C
/*
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* Copyright (c) 1997 - 2008 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "krb5_locl.h"
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#include <pkinit_asn1.h>
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krb5_error_code
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_krb5_pk_octetstring2key(krb5_context context,
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krb5_enctype type,
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const void *dhdata,
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size_t dhsize,
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const heim_octet_string *c_n,
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const heim_octet_string *k_n,
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krb5_keyblock *key)
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{
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struct encryption_type *et = _krb5_find_enctype(type);
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krb5_error_code ret;
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size_t keylen, offset;
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void *keydata;
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unsigned char counter;
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unsigned char shaoutput[SHA_DIGEST_LENGTH];
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EVP_MD_CTX *m;
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if(et == NULL) {
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("encryption type %d not supported", ""),
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type);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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keylen = (et->keytype->bits + 7) / 8;
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keydata = malloc(keylen);
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if (keydata == NULL) {
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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m = EVP_MD_CTX_create();
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if (m == NULL) {
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free(keydata);
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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counter = 0;
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offset = 0;
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do {
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EVP_DigestInit_ex(m, EVP_sha1(), NULL);
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EVP_DigestUpdate(m, &counter, 1);
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EVP_DigestUpdate(m, dhdata, dhsize);
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if (c_n)
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EVP_DigestUpdate(m, c_n->data, c_n->length);
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if (k_n)
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EVP_DigestUpdate(m, k_n->data, k_n->length);
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EVP_DigestFinal_ex(m, shaoutput, NULL);
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memcpy((unsigned char *)keydata + offset,
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shaoutput,
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min(keylen - offset, sizeof(shaoutput)));
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offset += sizeof(shaoutput);
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counter++;
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} while(offset < keylen);
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memset(shaoutput, 0, sizeof(shaoutput));
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EVP_MD_CTX_destroy(m);
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ret = krb5_random_to_key(context, type, keydata, keylen, key);
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memset(keydata, 0, sizeof(keylen));
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free(keydata);
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return ret;
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}
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static krb5_error_code
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encode_uvinfo(krb5_context context, krb5_const_principal p, krb5_data *data)
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{
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KRB5PrincipalName pn;
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krb5_error_code ret;
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size_t size;
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pn.principalName = p->name;
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pn.realm = p->realm;
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ASN1_MALLOC_ENCODE(KRB5PrincipalName, data->data, data->length,
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&pn, &size, ret);
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if (ret) {
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krb5_data_zero(data);
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krb5_set_error_message(context, ret,
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N_("Failed to encode KRB5PrincipalName", ""));
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return ret;
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}
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if (data->length != size)
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krb5_abortx(context, "asn1 compiler internal error");
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return 0;
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}
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static krb5_error_code
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encode_otherinfo(krb5_context context,
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const AlgorithmIdentifier *ai,
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krb5_const_principal client,
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krb5_const_principal server,
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krb5_enctype enctype,
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const krb5_data *as_req,
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const krb5_data *pk_as_rep,
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const Ticket *ticket,
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krb5_data *other)
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{
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PkinitSP80056AOtherInfo otherinfo;
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PkinitSuppPubInfo pubinfo;
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krb5_error_code ret;
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krb5_data pub;
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size_t size;
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krb5_data_zero(other);
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memset(&otherinfo, 0, sizeof(otherinfo));
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memset(&pubinfo, 0, sizeof(pubinfo));
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pubinfo.enctype = enctype;
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pubinfo.as_REQ = *as_req;
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pubinfo.pk_as_rep = *pk_as_rep;
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pubinfo.ticket = *ticket;
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ASN1_MALLOC_ENCODE(PkinitSuppPubInfo, pub.data, pub.length,
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&pubinfo, &size, ret);
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if (ret) {
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krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
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return ret;
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}
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if (pub.length != size)
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krb5_abortx(context, "asn1 compiler internal error");
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ret = encode_uvinfo(context, client, &otherinfo.partyUInfo);
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if (ret) {
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free(pub.data);
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return ret;
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}
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ret = encode_uvinfo(context, server, &otherinfo.partyVInfo);
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if (ret) {
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free(otherinfo.partyUInfo.data);
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free(pub.data);
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return ret;
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}
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otherinfo.algorithmID = *ai;
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otherinfo.suppPubInfo = &pub;
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ASN1_MALLOC_ENCODE(PkinitSP80056AOtherInfo, other->data, other->length,
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&otherinfo, &size, ret);
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free(otherinfo.partyUInfo.data);
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free(otherinfo.partyVInfo.data);
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free(pub.data);
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if (ret) {
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krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
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return ret;
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}
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if (other->length != size)
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krb5_abortx(context, "asn1 compiler internal error");
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return 0;
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}
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krb5_error_code
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_krb5_pk_kdf(krb5_context context,
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const struct AlgorithmIdentifier *ai,
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const void *dhdata,
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size_t dhsize,
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krb5_const_principal client,
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krb5_const_principal server,
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krb5_enctype enctype,
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const krb5_data *as_req,
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const krb5_data *pk_as_rep,
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const Ticket *ticket,
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krb5_keyblock *key)
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{
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struct encryption_type *et;
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krb5_error_code ret;
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krb5_data other;
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size_t keylen, offset;
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uint32_t counter;
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unsigned char *keydata;
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unsigned char shaoutput[SHA_DIGEST_LENGTH];
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EVP_MD_CTX *m;
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if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha1, &ai->algorithm) != 0) {
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("KDF not supported", ""));
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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if (ai->parameters != NULL &&
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(ai->parameters->length != 2 ||
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memcmp(ai->parameters->data, "\x05\x00", 2) != 0))
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{
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("kdf params not NULL or the NULL-type",
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""));
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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et = _krb5_find_enctype(enctype);
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if(et == NULL) {
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krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
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N_("encryption type %d not supported", ""),
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enctype);
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return KRB5_PROG_ETYPE_NOSUPP;
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}
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keylen = (et->keytype->bits + 7) / 8;
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keydata = malloc(keylen);
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if (keydata == NULL) {
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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ret = encode_otherinfo(context, ai, client, server,
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enctype, as_req, pk_as_rep, ticket, &other);
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if (ret) {
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free(keydata);
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return ret;
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}
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m = EVP_MD_CTX_create();
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if (m == NULL) {
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free(keydata);
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free(other.data);
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krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
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return ENOMEM;
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}
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offset = 0;
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counter = 1;
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do {
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unsigned char cdata[4];
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EVP_DigestInit_ex(m, EVP_sha1(), NULL);
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_krb5_put_int(cdata, counter, 4);
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EVP_DigestUpdate(m, cdata, 4);
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EVP_DigestUpdate(m, dhdata, dhsize);
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EVP_DigestUpdate(m, other.data, other.length);
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EVP_DigestFinal_ex(m, shaoutput, NULL);
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memcpy((unsigned char *)keydata + offset,
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shaoutput,
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min(keylen - offset, sizeof(shaoutput)));
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offset += sizeof(shaoutput);
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counter++;
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} while(offset < keylen);
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memset(shaoutput, 0, sizeof(shaoutput));
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EVP_MD_CTX_destroy(m);
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free(other.data);
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ret = krb5_random_to_key(context, enctype, keydata, keylen, key);
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memset(keydata, 0, sizeof(keylen));
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free(keydata);
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return ret;
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}
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