crypto/external/bsd/heimdal/dist/lib/gssapi/krb5/prf.c

   1 /*      $NetBSD: prf.c,v 1.1.1.2 2014/04/24 12:45:29 pettai Exp $       */
   2
   3 /*
   4  * Copyright (c) 2007 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * 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 "gsskrb5_locl.h"
  37
  38 OM_uint32 GSSAPI_CALLCONV
  39 _gsskrb5_pseudo_random(OM_uint32 *minor_status,
  40                        gss_ctx_id_t context_handle,
  41                        int prf_key,
  42                        const gss_buffer_t prf_in,
  43                        ssize_t desired_output_len,
  44                        gss_buffer_t prf_out)
  45 {
  46     gsskrb5_ctx ctx = (gsskrb5_ctx)context_handle;
  47     krb5_context context;
  48     krb5_error_code ret;
  49     krb5_crypto crypto;
  50     krb5_data input, output;
  51     uint32_t num;
  52     OM_uint32 junk;
  53     unsigned char *p;
  54     krb5_keyblock *key = NULL;
  55     size_t dol;
  56
  57     if (ctx == NULL) {
  58         *minor_status = 0;
  59         return GSS_S_NO_CONTEXT;
  60     }
  61
  62     if (desired_output_len <= 0 || prf_in->length + 4 < prf_in->length) {
  63         *minor_status = 0;
  64         return GSS_S_FAILURE;
  65     }
  66     dol = desired_output_len;
  67
  68     GSSAPI_KRB5_INIT (&context);
  69
  70     switch(prf_key) {
  71     case GSS_C_PRF_KEY_FULL:
  72         _gsskrb5i_get_acceptor_subkey(ctx, context, &key);
  73         break;
  74     case GSS_C_PRF_KEY_PARTIAL:
  75         _gsskrb5i_get_initiator_subkey(ctx, context, &key);
  76         break;
  77     default:
  78         _gsskrb5_set_status(EINVAL, "unknown kerberos prf_key");
  79         *minor_status = EINVAL;
  80         return GSS_S_FAILURE;
  81     }
  82
  83     if (key == NULL) {
  84         _gsskrb5_set_status(EINVAL, "no prf_key found");
  85         *minor_status = EINVAL;
  86         return GSS_S_FAILURE;
  87     }
  88
  89     ret = krb5_crypto_init(context, key, 0, &crypto);
  90     krb5_free_keyblock (context, key);
  91     if (ret) {
  92         *minor_status = ret;
  93         return GSS_S_FAILURE;
  94     }
  95
  96     prf_out->value = malloc(dol);
  97     if (prf_out->value == NULL) {
  98         _gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory");
  99         *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
 100         krb5_crypto_destroy(context, crypto);
 101         return GSS_S_FAILURE;
 102     }
 103     prf_out->length = dol;
 104
 105     HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
 106
 107     input.length = prf_in->length + 4;
 108     input.data = malloc(prf_in->length + 4);
 109     if (input.data == NULL) {
 110         _gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory");
 111         *minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
 112         gss_release_buffer(&junk, prf_out);
 113         krb5_crypto_destroy(context, crypto);
 114         HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 115         return GSS_S_FAILURE;
 116     }
 117     memcpy(((uint8_t *)input.data) + 4, prf_in->value, prf_in->length);
 118
 119     num = 0;
 120     p = prf_out->value;
 121     while(dol > 0) {
 122         size_t tsize;
 123
 124         _gsskrb5_encode_be_om_uint32(num, input.data);
 125
 126         ret = krb5_crypto_prf(context, crypto, &input, &output);
 127         if (ret) {
 128             *minor_status = ret;
 129             free(input.data);
 130             gss_release_buffer(&junk, prf_out);
 131             krb5_crypto_destroy(context, crypto);
 132             HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 133             return GSS_S_FAILURE;
 134         }
 135
 136         tsize = min(dol, output.length);
 137         memcpy(p, output.data, tsize);
 138         p += tsize;
 139         dol -= tsize;
 140         krb5_data_free(&output);
 141         num++;
 142     }
 143     free(input.data);
 144
 145     krb5_crypto_destroy(context, crypto);
 146
 147     HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
 148
 149     return GSS_S_COMPLETE;
 150 }