freebsd-dev/crypto/heimdal/lib/krb5/crypto-pk.c
Stanislav Sedov ae77177087 - Update FreeBSD Heimdal distribution to version 1.5.1. This also brings
several new kerberos related libraries and applications to FreeBSD:
  o kgetcred(1) allows one to manually get a ticket for a particular service.
  o kf(1) securily forwards ticket to another host through an authenticated
    and encrypted stream.
  o kcc(1) is an umbrella program around klist(1), kswitch(1), kgetcred(1)
    and other user kerberos operations. klist and kswitch are just symlinks
    to kcc(1) now.
  o kswitch(1) allows you to easily switch between kerberos credentials if
    you're running KCM.
  o hxtool(1) is a certificate management tool to use with PKINIT.
  o string2key(1) maps a password into key.
  o kdigest(8) is a userland tool to access the KDC's digest interface.
  o kimpersonate(8) creates a "fake" ticket for a service.

  We also now install manpages for some lirbaries that were not installed
  before, libheimntlm and libhx509.

- The new HEIMDAL version no longer supports Kerberos 4.  All users are
  recommended to switch to Kerberos 5.

- Weak ciphers are now disabled by default.  To enable DES support (used
  by telnet(8)), use "allow_weak_crypto" option in krb5.conf.

- libtelnet, pam_ksu and pam_krb5 are now compiled with error on warnings
  disabled due to the function they use (krb5_get_err_text(3)) being
  deprecated.  I plan to work on this next.

- Heimdal's KDC now require sqlite to operate.  We use the bundled version
  and install it as libheimsqlite.  If some other FreeBSD components will
  require it in the future we can rename it to libbsdsqlite and use for these
  components as well.

- This is not a latest Heimdal version, the new one was released while I was
  working on the update.  I will update it to 1.5.2 soon, as it fixes some
  important bugs and security issues.
2012-03-22 08:48:42 +00:00

302 lines
8.4 KiB
C

/*
* Copyright (c) 1997 - 2008 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"
#include <pkinit_asn1.h>
krb5_error_code
_krb5_pk_octetstring2key(krb5_context context,
krb5_enctype type,
const void *dhdata,
size_t dhsize,
const heim_octet_string *c_n,
const heim_octet_string *k_n,
krb5_keyblock *key)
{
struct _krb5_encryption_type *et = _krb5_find_enctype(type);
krb5_error_code ret;
size_t keylen, offset;
void *keydata;
unsigned char counter;
unsigned char shaoutput[SHA_DIGEST_LENGTH];
EVP_MD_CTX *m;
if(et == NULL) {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
type);
return KRB5_PROG_ETYPE_NOSUPP;
}
keylen = (et->keytype->bits + 7) / 8;
keydata = malloc(keylen);
if (keydata == NULL) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
m = EVP_MD_CTX_create();
if (m == NULL) {
free(keydata);
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
counter = 0;
offset = 0;
do {
EVP_DigestInit_ex(m, EVP_sha1(), NULL);
EVP_DigestUpdate(m, &counter, 1);
EVP_DigestUpdate(m, dhdata, dhsize);
if (c_n)
EVP_DigestUpdate(m, c_n->data, c_n->length);
if (k_n)
EVP_DigestUpdate(m, k_n->data, k_n->length);
EVP_DigestFinal_ex(m, shaoutput, NULL);
memcpy((unsigned char *)keydata + offset,
shaoutput,
min(keylen - offset, sizeof(shaoutput)));
offset += sizeof(shaoutput);
counter++;
} while(offset < keylen);
memset(shaoutput, 0, sizeof(shaoutput));
EVP_MD_CTX_destroy(m);
ret = krb5_random_to_key(context, type, keydata, keylen, key);
memset(keydata, 0, sizeof(keylen));
free(keydata);
return ret;
}
static krb5_error_code
encode_uvinfo(krb5_context context, krb5_const_principal p, krb5_data *data)
{
KRB5PrincipalName pn;
krb5_error_code ret;
size_t size = 0;
pn.principalName = p->name;
pn.realm = p->realm;
ASN1_MALLOC_ENCODE(KRB5PrincipalName, data->data, data->length,
&pn, &size, ret);
if (ret) {
krb5_data_zero(data);
krb5_set_error_message(context, ret,
N_("Failed to encode KRB5PrincipalName", ""));
return ret;
}
if (data->length != size)
krb5_abortx(context, "asn1 compiler internal error");
return 0;
}
static krb5_error_code
encode_otherinfo(krb5_context context,
const AlgorithmIdentifier *ai,
krb5_const_principal client,
krb5_const_principal server,
krb5_enctype enctype,
const krb5_data *as_req,
const krb5_data *pk_as_rep,
const Ticket *ticket,
krb5_data *other)
{
PkinitSP80056AOtherInfo otherinfo;
PkinitSuppPubInfo pubinfo;
krb5_error_code ret;
krb5_data pub;
size_t size = 0;
krb5_data_zero(other);
memset(&otherinfo, 0, sizeof(otherinfo));
memset(&pubinfo, 0, sizeof(pubinfo));
pubinfo.enctype = enctype;
pubinfo.as_REQ = *as_req;
pubinfo.pk_as_rep = *pk_as_rep;
pubinfo.ticket = *ticket;
ASN1_MALLOC_ENCODE(PkinitSuppPubInfo, pub.data, pub.length,
&pubinfo, &size, ret);
if (ret) {
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
return ret;
}
if (pub.length != size)
krb5_abortx(context, "asn1 compiler internal error");
ret = encode_uvinfo(context, client, &otherinfo.partyUInfo);
if (ret) {
free(pub.data);
return ret;
}
ret = encode_uvinfo(context, server, &otherinfo.partyVInfo);
if (ret) {
free(otherinfo.partyUInfo.data);
free(pub.data);
return ret;
}
otherinfo.algorithmID = *ai;
otherinfo.suppPubInfo = &pub;
ASN1_MALLOC_ENCODE(PkinitSP80056AOtherInfo, other->data, other->length,
&otherinfo, &size, ret);
free(otherinfo.partyUInfo.data);
free(otherinfo.partyVInfo.data);
free(pub.data);
if (ret) {
krb5_set_error_message(context, ret, N_("malloc: out of memory", ""));
return ret;
}
if (other->length != size)
krb5_abortx(context, "asn1 compiler internal error");
return 0;
}
krb5_error_code
_krb5_pk_kdf(krb5_context context,
const struct AlgorithmIdentifier *ai,
const void *dhdata,
size_t dhsize,
krb5_const_principal client,
krb5_const_principal server,
krb5_enctype enctype,
const krb5_data *as_req,
const krb5_data *pk_as_rep,
const Ticket *ticket,
krb5_keyblock *key)
{
struct _krb5_encryption_type *et;
krb5_error_code ret;
krb5_data other;
size_t keylen, offset;
uint32_t counter;
unsigned char *keydata;
unsigned char shaoutput[SHA512_DIGEST_LENGTH];
const EVP_MD *md;
EVP_MD_CTX *m;
if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha1, &ai->algorithm) == 0) {
md = EVP_sha1();
} else if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha256, &ai->algorithm) == 0) {
md = EVP_sha256();
} else if (der_heim_oid_cmp(&asn1_oid_id_pkinit_kdf_ah_sha512, &ai->algorithm) == 0) {
md = EVP_sha512();
} else {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("KDF not supported", ""));
return KRB5_PROG_ETYPE_NOSUPP;
}
if (ai->parameters != NULL &&
(ai->parameters->length != 2 ||
memcmp(ai->parameters->data, "\x05\x00", 2) != 0))
{
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("kdf params not NULL or the NULL-type",
""));
return KRB5_PROG_ETYPE_NOSUPP;
}
et = _krb5_find_enctype(enctype);
if(et == NULL) {
krb5_set_error_message(context, KRB5_PROG_ETYPE_NOSUPP,
N_("encryption type %d not supported", ""),
enctype);
return KRB5_PROG_ETYPE_NOSUPP;
}
keylen = (et->keytype->bits + 7) / 8;
keydata = malloc(keylen);
if (keydata == NULL) {
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
ret = encode_otherinfo(context, ai, client, server,
enctype, as_req, pk_as_rep, ticket, &other);
if (ret) {
free(keydata);
return ret;
}
m = EVP_MD_CTX_create();
if (m == NULL) {
free(keydata);
free(other.data);
krb5_set_error_message(context, ENOMEM, N_("malloc: out of memory", ""));
return ENOMEM;
}
offset = 0;
counter = 1;
do {
unsigned char cdata[4];
EVP_DigestInit_ex(m, md, NULL);
_krb5_put_int(cdata, counter, 4);
EVP_DigestUpdate(m, cdata, 4);
EVP_DigestUpdate(m, dhdata, dhsize);
EVP_DigestUpdate(m, other.data, other.length);
EVP_DigestFinal_ex(m, shaoutput, NULL);
memcpy((unsigned char *)keydata + offset,
shaoutput,
min(keylen - offset, EVP_MD_CTX_size(m)));
offset += EVP_MD_CTX_size(m);
counter++;
} while(offset < keylen);
memset(shaoutput, 0, sizeof(shaoutput));
EVP_MD_CTX_destroy(m);
free(other.data);
ret = krb5_random_to_key(context, enctype, keydata, keylen, key);
memset(keydata, 0, sizeof(keylen));
free(keydata);
return ret;
}