253 lines
7.2 KiB
C
253 lines
7.2 KiB
C
/*
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* Copyright (c) 1997 - 2003 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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/*
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* Return initiator subkey, or if that doesn't exists, the subkey.
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*/
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krb5_error_code
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_gsskrb5i_get_initiator_subkey(const gsskrb5_ctx ctx,
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krb5_context context,
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krb5_keyblock **key)
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{
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krb5_error_code ret;
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*key = NULL;
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if (ctx->more_flags & LOCAL) {
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ret = krb5_auth_con_getlocalsubkey(context,
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ctx->auth_context,
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key);
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} else {
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ret = krb5_auth_con_getremotesubkey(context,
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ctx->auth_context,
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key);
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}
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if (ret == 0 && *key == NULL)
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ret = krb5_auth_con_getkey(context,
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ctx->auth_context,
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key);
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if (ret == 0 && *key == NULL) {
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krb5_set_error_message(context, 0, "No initiator subkey available");
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return GSS_KRB5_S_KG_NO_SUBKEY;
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}
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return ret;
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}
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krb5_error_code
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_gsskrb5i_get_acceptor_subkey(const gsskrb5_ctx ctx,
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krb5_context context,
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krb5_keyblock **key)
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{
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krb5_error_code ret;
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*key = NULL;
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if (ctx->more_flags & LOCAL) {
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ret = krb5_auth_con_getremotesubkey(context,
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ctx->auth_context,
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key);
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} else {
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ret = krb5_auth_con_getlocalsubkey(context,
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ctx->auth_context,
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key);
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}
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if (ret == 0 && *key == NULL) {
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krb5_set_error_message(context, 0, "No acceptor subkey available");
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return GSS_KRB5_S_KG_NO_SUBKEY;
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}
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return ret;
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}
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OM_uint32
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_gsskrb5i_get_token_key(const gsskrb5_ctx ctx,
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krb5_context context,
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krb5_keyblock **key)
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{
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_gsskrb5i_get_acceptor_subkey(ctx, context, key);
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if(*key == NULL) {
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/*
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* Only use the initiator subkey or ticket session key if an
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* acceptor subkey was not required.
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*/
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if ((ctx->more_flags & ACCEPTOR_SUBKEY) == 0)
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_gsskrb5i_get_initiator_subkey(ctx, context, key);
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}
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if (*key == NULL) {
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krb5_set_error_message(context, 0, "No token key available");
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return GSS_KRB5_S_KG_NO_SUBKEY;
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}
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return 0;
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}
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static OM_uint32
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sub_wrap_size (
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OM_uint32 req_output_size,
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OM_uint32 * max_input_size,
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int blocksize,
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int extrasize
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)
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{
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size_t len, total_len;
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len = 8 + req_output_size + blocksize + extrasize;
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_gsskrb5_encap_length(len, &len, &total_len, GSS_KRB5_MECHANISM);
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total_len -= req_output_size; /* token length */
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if (total_len < req_output_size) {
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*max_input_size = (req_output_size - total_len);
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(*max_input_size) &= (~(OM_uint32)(blocksize - 1));
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} else {
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*max_input_size = 0;
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}
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return GSS_S_COMPLETE;
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}
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OM_uint32 GSSAPI_CALLCONV
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_gsskrb5_wrap_size_limit (
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OM_uint32 * minor_status,
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gss_const_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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OM_uint32 req_output_size,
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OM_uint32 * max_input_size
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)
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{
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krb5_context context;
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krb5_keyblock *key;
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OM_uint32 ret;
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const gsskrb5_ctx ctx = rk_UNCONST(context_handle);
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GSSAPI_KRB5_INIT (&context);
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if (ctx->more_flags & IS_CFX)
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return _gssapi_wrap_size_cfx(minor_status, ctx, context,
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conf_req_flag, qop_req,
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req_output_size, max_input_size);
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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ret = _gsskrb5i_get_token_key(ctx, context, &key);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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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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switch (key->keytype) {
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case KRB5_ENCTYPE_DES_CBC_CRC :
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case KRB5_ENCTYPE_DES_CBC_MD4 :
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case KRB5_ENCTYPE_DES_CBC_MD5 :
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#ifdef HEIM_WEAK_CRYPTO
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ret = sub_wrap_size(req_output_size, max_input_size, 8, 22);
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#else
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ret = GSS_S_FAILURE;
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#endif
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break;
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case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
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case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
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ret = _gssapi_wrap_size_arcfour(minor_status, ctx, context,
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conf_req_flag, qop_req,
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req_output_size, max_input_size, key);
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break;
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case KRB5_ENCTYPE_DES3_CBC_MD5 :
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case KRB5_ENCTYPE_DES3_CBC_SHA1 :
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ret = sub_wrap_size(req_output_size, max_input_size, 8, 34);
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break;
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default :
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abort();
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break;
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}
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krb5_free_keyblock (context, key);
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*minor_status = 0;
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return ret;
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}
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OM_uint32 GSSAPI_CALLCONV
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_gsskrb5_wrap
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(OM_uint32 * minor_status,
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gss_const_ctx_id_t context_handle,
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int conf_req_flag,
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gss_qop_t qop_req,
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const gss_buffer_t input_message_buffer,
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int * conf_state,
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gss_buffer_t output_message_buffer
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)
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{
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krb5_context context;
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krb5_keyblock *key;
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OM_uint32 ret;
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const gsskrb5_ctx ctx = rk_UNCONST(context_handle);
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output_message_buffer->value = NULL;
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output_message_buffer->length = 0;
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GSSAPI_KRB5_INIT (&context);
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if (ctx->more_flags & IS_CFX)
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return _gssapi_wrap_cfx (minor_status, ctx, context, conf_req_flag,
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input_message_buffer, conf_state,
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output_message_buffer);
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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ret = _gsskrb5i_get_token_key(ctx, context, &key);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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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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switch (key->keytype) {
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case KRB5_ENCTYPE_DES_CBC_CRC :
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case KRB5_ENCTYPE_DES_CBC_MD4 :
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case KRB5_ENCTYPE_DES_CBC_MD5 :
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ret = GSS_S_FAILURE;
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break;
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case KRB5_ENCTYPE_DES3_CBC_MD5 :
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case KRB5_ENCTYPE_DES3_CBC_SHA1 :
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ret = GSS_S_FAILURE;
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break;
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case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5:
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case KRB5_ENCTYPE_ARCFOUR_HMAC_MD5_56:
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ret = _gssapi_wrap_arcfour (minor_status, ctx, context, conf_req_flag,
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qop_req, input_message_buffer, conf_state,
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output_message_buffer, key);
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break;
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default :
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abort();
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break;
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}
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krb5_free_keyblock (context, key);
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return ret;
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}
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