143 lines
4.4 KiB
C
143 lines
4.4 KiB
C
/*
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* Copyright (c) 2007 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 "gsskrb5_locl.h"
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OM_uint32 GSSAPI_CALLCONV
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_gsskrb5_pseudo_random(OM_uint32 *minor_status,
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gss_ctx_id_t context_handle,
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int prf_key,
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const gss_buffer_t prf_in,
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ssize_t desired_output_len,
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gss_buffer_t prf_out)
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{
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gsskrb5_ctx ctx = (gsskrb5_ctx)context_handle;
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krb5_context context;
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krb5_error_code ret;
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krb5_crypto crypto;
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krb5_data input, output;
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uint32_t num;
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unsigned char *p;
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krb5_keyblock *key = NULL;
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if (ctx == NULL) {
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*minor_status = 0;
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return GSS_S_NO_CONTEXT;
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}
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if (desired_output_len <= 0) {
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*minor_status = 0;
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return GSS_S_FAILURE;
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}
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GSSAPI_KRB5_INIT (&context);
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switch(prf_key) {
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case GSS_C_PRF_KEY_FULL:
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_gsskrb5i_get_acceptor_subkey(ctx, context, &key);
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break;
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case GSS_C_PRF_KEY_PARTIAL:
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_gsskrb5i_get_initiator_subkey(ctx, context, &key);
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break;
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default:
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_gsskrb5_set_status(EINVAL, "unknown kerberos prf_key");
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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if (key == NULL) {
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_gsskrb5_set_status(EINVAL, "no prf_key found");
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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ret = krb5_crypto_init(context, key, 0, &crypto);
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krb5_free_keyblock (context, key);
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if (ret) {
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*minor_status = ret;
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return GSS_S_FAILURE;
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}
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prf_out->value = malloc(desired_output_len);
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if (prf_out->value == NULL) {
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_gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory");
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*minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
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krb5_crypto_destroy(context, crypto);
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return GSS_S_FAILURE;
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}
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prf_out->length = desired_output_len;
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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input.length = prf_in->length + 4;
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input.data = malloc(prf_in->length + 4);
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if (input.data == NULL) {
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OM_uint32 junk;
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_gsskrb5_set_status(GSS_KRB5_S_KG_INPUT_TOO_LONG, "Out of memory");
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*minor_status = GSS_KRB5_S_KG_INPUT_TOO_LONG;
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gss_release_buffer(&junk, prf_out);
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krb5_crypto_destroy(context, crypto);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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return GSS_S_FAILURE;
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}
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memcpy(((unsigned char *)input.data) + 4, prf_in->value, prf_in->length);
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num = 0;
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p = prf_out->value;
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while(desired_output_len > 0) {
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_gsskrb5_encode_om_uint32(num, input.data);
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ret = krb5_crypto_prf(context, crypto, &input, &output);
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if (ret) {
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OM_uint32 junk;
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*minor_status = ret;
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free(input.data);
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gss_release_buffer(&junk, prf_out);
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krb5_crypto_destroy(context, crypto);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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return GSS_S_FAILURE;
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}
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memcpy(p, output.data, min(desired_output_len, output.length));
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p += output.length;
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desired_output_len -= output.length;
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krb5_data_free(&output);
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num++;
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}
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free(input.data);
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krb5_crypto_destroy(context, crypto);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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return GSS_S_COMPLETE;
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}
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