LCOV - code coverage report
Current view: top level - third_party/heimdal/lib/krb5 - pkinit-ec.c (source / functions) Hit Total Coverage
Test: coverage report for v4-17-test 1498b464 Lines: 0 10 0.0 %
Date: 2024-06-13 04:01:37 Functions: 0 3 0.0 %

          Line data    Source code
       1             : /*
       2             :  * Copyright (c) 2016 Kungliga Tekniska Högskolan
       3             :  * (Royal Institute of Technology, Stockholm, Sweden).
       4             :  * All rights reserved.
       5             :  *
       6             :  * Portions Copyright (c) 2009 Apple Inc. All rights reserved.
       7             :  *
       8             :  * Redistribution and use in source and binary forms, with or without
       9             :  * modification, are permitted provided that the following conditions
      10             :  * are met:
      11             :  *
      12             :  * 1. Redistributions of source code must retain the above copyright
      13             :  *    notice, this list of conditions and the following disclaimer.
      14             :  *
      15             :  * 2. Redistributions in binary form must reproduce the above copyright
      16             :  *    notice, this list of conditions and the following disclaimer in the
      17             :  *    documentation and/or other materials provided with the distribution.
      18             :  *
      19             :  * 3. Neither the name of the Institute nor the names of its contributors
      20             :  *    may be used to endorse or promote products derived from this software
      21             :  *    without specific prior written permission.
      22             :  *
      23             :  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
      24             :  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
      25             :  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
      26             :  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
      27             :  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
      28             :  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
      29             :  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
      30             :  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
      31             :  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
      32             :  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
      33             :  * SUCH DAMAGE.
      34             :  */
      35             : 
      36             : #include <config.h>
      37             : #include <roken.h>
      38             : 
      39             : #ifdef PKINIT
      40             : 
      41             : /*
      42             :  * As with the other *-ec.c files in Heimdal, this is a bit of a hack.
      43             :  *
      44             :  * The idea is to use OpenSSL for EC because hcrypto doesn't have the
      45             :  * required functionality at this time.  To do this we segregate
      46             :  * EC-using code into separate source files and then we arrange for them
      47             :  * to get the OpenSSL headers and not the conflicting hcrypto ones.
      48             :  *
      49             :  * Because of auto-generated *-private.h headers, we end up needing to
      50             :  * make sure various types are defined before we include them, thus the
      51             :  * strange header include order here.
      52             :  */
      53             : 
      54             : #ifdef HAVE_HCRYPTO_W_OPENSSL
      55             : #include <openssl/ec.h>
      56             : #include <openssl/ecdh.h>
      57             : #include <openssl/evp.h>
      58             : #include <openssl/bn.h>
      59             : #define HEIM_NO_CRYPTO_HDRS
      60             : #endif
      61             : 
      62             : /*
      63             :  * NO_HCRYPTO_POLLUTION -> don't refer to hcrypto type/function names
      64             :  * that we don't need in this file and which would clash with OpenSSL's
      65             :  * in ways that are difficult to address in cleaner ways.
      66             :  *
      67             :  * In the medium- to long-term what we should do is move all PK in
      68             :  * Heimdal to the newer EVP interfaces for PK and then nothing outside
      69             :  * lib/hcrypto should ever have to include OpenSSL headers, and -more
      70             :  * specifically- the only thing that should ever have to include OpenSSL
      71             :  * headers is the OpenSSL backend to hcrypto.
      72             :  */
      73             : #define NO_HCRYPTO_POLLUTION
      74             : 
      75             : #include "krb5_locl.h"
      76             : #include <hcrypto/des.h>
      77             : #include <cms_asn1.h>
      78             : #include <pkcs8_asn1.h>
      79             : #include <pkcs9_asn1.h>
      80             : #include <pkcs12_asn1.h>
      81             : #include <pkinit_asn1.h>
      82             : #include <asn1_err.h>
      83             : 
      84             : #include <der.h>
      85             : 
      86             : krb5_error_code
      87           0 : _krb5_build_authpack_subjectPK_EC(krb5_context context,
      88             :                                   krb5_pk_init_ctx ctx,
      89             :                                   AuthPack *a)
      90             : {
      91             : #ifdef HAVE_HCRYPTO_W_OPENSSL
      92             :     krb5_error_code ret;
      93             :     ECParameters ecp;
      94             :     unsigned char *p;
      95             :     size_t size;
      96             :     int xlen;
      97             : 
      98             :     /* copy in public key, XXX find the best curve that the server support or use the clients curve if possible */
      99             : 
     100             :     ecp.element = choice_ECParameters_namedCurve;
     101             :     ret = der_copy_oid(&asn1_oid_id_ec_group_secp256r1,
     102             :                        &ecp.u.namedCurve);
     103             :     if (ret)
     104             :         return ret;
     105             : 
     106             :     ALLOC(a->clientPublicValue->algorithm.parameters, 1);
     107             :     if (a->clientPublicValue->algorithm.parameters == NULL) {
     108             :         free_ECParameters(&ecp);
     109             :         return krb5_enomem(context);
     110             :     }
     111             :     ASN1_MALLOC_ENCODE(ECParameters, p, xlen, &ecp, &size, ret);
     112             :     free_ECParameters(&ecp);
     113             :     if (ret)
     114             :         return ret;
     115             :     if ((int)size != xlen)
     116             :         krb5_abortx(context, "asn1 internal error");
     117             : 
     118             :     a->clientPublicValue->algorithm.parameters->data = p;
     119             :     a->clientPublicValue->algorithm.parameters->length = size;
     120             : 
     121             :     /* copy in public key */
     122             : 
     123             :     ret = der_copy_oid(&asn1_oid_id_ecPublicKey,
     124             :                        &a->clientPublicValue->algorithm.algorithm);
     125             :     if (ret)
     126             :         return ret;
     127             : 
     128             :     ctx->u.eckey = EC_KEY_new_by_curve_name(NID_X9_62_prime256v1);
     129             :     if (ctx->u.eckey == NULL)
     130             :         return krb5_enomem(context);
     131             : 
     132             :     ret = EC_KEY_generate_key(ctx->u.eckey);
     133             :     if (ret != 1)
     134             :         return EINVAL;
     135             : 
     136             :     xlen = i2o_ECPublicKey(ctx->u.eckey, NULL);
     137             :     if (xlen <= 0)
     138             :         return EINVAL;
     139             : 
     140             :     p = malloc(xlen);
     141             :     if (p == NULL)
     142             :         return krb5_enomem(context);
     143             : 
     144             :     a->clientPublicValue->subjectPublicKey.data = p;
     145             : 
     146             :     xlen = i2o_ECPublicKey(ctx->u.eckey, &p);
     147             :     if (xlen <= 0) {
     148             :         a->clientPublicValue->subjectPublicKey.data = NULL;
     149             :         free(p);
     150             :         return EINVAL;
     151             :     }
     152             : 
     153             :     a->clientPublicValue->subjectPublicKey.length = xlen * 8;
     154             : 
     155             :     return 0;
     156             : 
     157             :     /* XXX verify that this is right with RFC3279 */
     158             : #else
     159           0 :     krb5_set_error_message(context, ENOTSUP,
     160           0 :                            N_("PKINIT: ECDH not supported", ""));
     161           0 :     return ENOTSUP;
     162             : #endif
     163             : }
     164             : 
     165             : krb5_error_code
     166           0 : _krb5_pk_rd_pa_reply_ecdh_compute_key(krb5_context context,
     167             :                                       krb5_pk_init_ctx ctx,
     168             :                                       const unsigned char *in,
     169             :                                       size_t in_sz,
     170             :                                       unsigned char **out,
     171             :                                       int *out_sz)
     172             : {
     173             : #ifdef HAVE_HCRYPTO_W_OPENSSL
     174             :     krb5_error_code ret = 0;
     175             :     int dh_gen_keylen;
     176             : 
     177             :     const EC_GROUP *group;
     178             :     EC_KEY *public = NULL;
     179             : 
     180             :     group = EC_KEY_get0_group(ctx->u.eckey);
     181             : 
     182             :     public = EC_KEY_new();
     183             :     if (public == NULL)
     184             :         return krb5_enomem(context);
     185             :     if (EC_KEY_set_group(public, group) != 1) {
     186             :         EC_KEY_free(public);
     187             :         return krb5_enomem(context);
     188             :     }
     189             : 
     190             :     if (o2i_ECPublicKey(&public, &in, in_sz) == NULL) {
     191             :         EC_KEY_free(public);
     192             :         ret = KRB5KRB_ERR_GENERIC;
     193             :         krb5_set_error_message(context, ret,
     194             :                                N_("PKINIT: Can't parse ECDH public key", ""));
     195             :         return ret;
     196             :     }
     197             : 
     198             :     *out_sz = (EC_GROUP_get_degree(group) + 7) / 8;
     199             :     if (*out_sz < 0)
     200             :         return EOVERFLOW;
     201             :     *out = malloc(*out_sz);
     202             :     if (*out == NULL) {
     203             :         EC_KEY_free(public);
     204             :         return krb5_enomem(context);
     205             :     }
     206             :     dh_gen_keylen = ECDH_compute_key(*out, *out_sz,
     207             :                                      EC_KEY_get0_public_key(public),
     208             :                                      ctx->u.eckey, NULL);
     209             :     EC_KEY_free(public);
     210             :     if (dh_gen_keylen <= 0) {
     211             :         ret = KRB5KRB_ERR_GENERIC;
     212             :         dh_gen_keylen = 0;
     213             :         krb5_set_error_message(context, ret,
     214             :                                N_("PKINIT: Can't compute ECDH public key", ""));
     215             :         free(*out);
     216             :         *out = NULL;
     217             :         *out_sz = 0;
     218             :     }
     219             :     *out_sz = dh_gen_keylen;
     220             : 
     221             :     return ret;
     222             : #else
     223           0 :     krb5_set_error_message(context, ENOTSUP,
     224           0 :                            N_("PKINIT: ECDH not supported", ""));
     225           0 :     return ENOTSUP;
     226             : #endif
     227             : }
     228             : 
     229             : void
     230           0 : _krb5_pk_eckey_free(void *eckey)
     231             : {
     232             : #ifdef HAVE_HCRYPTO_W_OPENSSL
     233             :     EC_KEY_free(eckey);
     234             : #endif
     235           0 : }
     236             : 
     237             : #else
     238             : 
     239             : static char lib_krb5_pkinit_ec_c = '\0';
     240             : 
     241             : #endif

Generated by: LCOV version 1.13