7df0195c26
The recent changes to SPNEGO removed support for GSS_C_PEER_HAS_UPDATED_SPNEGO, through which the Kerberos mechanism could indicate to SPNEGO that the peer did not suffer from SPNEGO conformance bugs present in some versions of Windows.* This patch restores this workaround, documented in [MS-SPNG] Appendix A <7> Section 3.1.5.1. Whilst improving interoperability with these admittedly now unsupported versions of Windows, it does introduce a risk that Kerberos with pre-AES ciphers could be negotiated in lieu of a stronger and more preferred mechanism. Note: this patch inverts the mechanism interface from GSS_C_PEER_HAS_UPDATED_SPNEGO to GSS_C_INQ_PEER_HAS_BUGGY_SPNEGO, so that new mechanisms (which did not ship with these older versions of Windows) are not required to implement it. * Windows 2000, Windows 2003, and Windows XP
599 lines
15 KiB
C
599 lines
15 KiB
C
/*
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* Copyright (c) 2004, PADL Software Pty Ltd.
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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 PADL Software 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 PADL SOFTWARE 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 PADL SOFTWARE 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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static int
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oid_prefix_equal(gss_OID oid_enc, gss_OID prefix_enc, unsigned *suffix)
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{
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int ret;
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heim_oid oid;
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heim_oid prefix;
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*suffix = 0;
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ret = der_get_oid(oid_enc->elements, oid_enc->length,
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&oid, NULL);
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if (ret) {
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return 0;
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}
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ret = der_get_oid(prefix_enc->elements, prefix_enc->length,
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&prefix, NULL);
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if (ret) {
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der_free_oid(&oid);
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return 0;
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}
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ret = 0;
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if (oid.length - 1 == prefix.length) {
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*suffix = oid.components[oid.length - 1];
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oid.length--;
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ret = (der_heim_oid_cmp(&oid, &prefix) == 0);
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oid.length++;
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}
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der_free_oid(&oid);
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der_free_oid(&prefix);
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return ret;
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}
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static OM_uint32 inquire_sec_context_tkt_flags
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(OM_uint32 *minor_status,
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const gsskrb5_ctx context_handle,
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gss_buffer_set_t *data_set)
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{
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OM_uint32 tkt_flags;
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unsigned char buf[4];
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gss_buffer_desc value;
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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if (context_handle->ticket == NULL) {
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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_gsskrb5_set_status(EINVAL, "No ticket from which to obtain flags");
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*minor_status = EINVAL;
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return GSS_S_BAD_MECH;
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}
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tkt_flags = TicketFlags2int(context_handle->ticket->ticket.flags);
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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_gsskrb5_encode_om_uint32(tkt_flags, buf);
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value.length = sizeof(buf);
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value.value = buf;
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return gss_add_buffer_set_member(minor_status,
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&value,
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data_set);
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}
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enum keytype { ACCEPTOR_KEY, INITIATOR_KEY, TOKEN_KEY };
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static OM_uint32 inquire_sec_context_get_subkey
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(OM_uint32 *minor_status,
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const gsskrb5_ctx context_handle,
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krb5_context context,
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enum keytype keytype,
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gss_buffer_set_t *data_set)
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{
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krb5_keyblock *key = NULL;
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krb5_storage *sp = NULL;
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krb5_data data;
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OM_uint32 maj_stat = GSS_S_COMPLETE;
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krb5_error_code ret;
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krb5_data_zero(&data);
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sp = krb5_storage_emem();
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if (sp == NULL) {
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_gsskrb5_clear_status();
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ret = ENOMEM;
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goto out;
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}
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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switch(keytype) {
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case ACCEPTOR_KEY:
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ret = _gsskrb5i_get_acceptor_subkey(context_handle, context, &key);
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break;
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case INITIATOR_KEY:
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ret = _gsskrb5i_get_initiator_subkey(context_handle, context, &key);
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break;
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case TOKEN_KEY:
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ret = _gsskrb5i_get_token_key(context_handle, context, &key);
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break;
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default:
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_gsskrb5_set_status(EINVAL, "%d is not a valid subkey type", keytype);
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ret = EINVAL;
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break;
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}
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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if (ret)
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goto out;
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if (key == NULL) {
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_gsskrb5_set_status(EINVAL, "have no subkey of type %d", keytype);
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ret = EINVAL;
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goto out;
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}
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ret = krb5_store_keyblock(sp, *key);
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if (ret)
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goto out;
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ret = krb5_storage_to_data(sp, &data);
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if (ret)
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goto out;
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{
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gss_buffer_desc value;
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value.length = data.length;
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value.value = data.data;
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maj_stat = gss_add_buffer_set_member(minor_status,
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&value,
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data_set);
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}
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out:
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krb5_free_keyblock(context, key);
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krb5_data_free(&data);
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if (sp)
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krb5_storage_free(sp);
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if (ret) {
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*minor_status = ret;
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maj_stat = GSS_S_FAILURE;
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}
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return maj_stat;
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}
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static OM_uint32 inquire_sec_context_get_sspi_session_key
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(OM_uint32 *minor_status,
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const gsskrb5_ctx context_handle,
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krb5_context context,
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gss_buffer_set_t *data_set)
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{
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krb5_keyblock *key;
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OM_uint32 maj_stat = GSS_S_COMPLETE;
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krb5_error_code ret;
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gss_buffer_desc value;
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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ret = _gsskrb5i_get_token_key(context_handle, context, &key);
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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if (ret)
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goto out;
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if (key == NULL) {
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ret = EINVAL;
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goto out;
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}
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value.length = key->keyvalue.length;
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value.value = key->keyvalue.data;
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maj_stat = gss_add_buffer_set_member(minor_status,
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&value,
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data_set);
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krb5_free_keyblock(context, key);
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/* MIT also returns the enctype encoded as an OID in data_set[1] */
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out:
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if (ret) {
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*minor_status = ret;
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maj_stat = GSS_S_FAILURE;
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}
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return maj_stat;
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}
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static OM_uint32 inquire_sec_context_authz_data
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(OM_uint32 *minor_status,
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const gsskrb5_ctx context_handle,
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krb5_context context,
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unsigned ad_type,
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gss_buffer_set_t *data_set)
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{
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krb5_data data;
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gss_buffer_desc ad_data;
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OM_uint32 ret;
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*minor_status = 0;
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*data_set = GSS_C_NO_BUFFER_SET;
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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if (context_handle->ticket == NULL) {
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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*minor_status = EINVAL;
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_gsskrb5_set_status(EINVAL, "No ticket to obtain authz data from");
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return GSS_S_NO_CONTEXT;
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}
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ret = krb5_ticket_get_authorization_data_type(context,
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context_handle->ticket,
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ad_type,
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&data);
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HEIMDAL_MUTEX_unlock(&context_handle->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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ad_data.value = data.data;
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ad_data.length = data.length;
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ret = gss_add_buffer_set_member(minor_status,
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&ad_data,
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data_set);
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krb5_data_free(&data);
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return ret;
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}
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static OM_uint32 inquire_sec_context_has_buggy_spnego
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(OM_uint32 *minor_status,
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const gsskrb5_ctx context_handle,
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gss_buffer_set_t *data_set)
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{
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uint8_t old_enctype;
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gss_buffer_desc buffer;
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*minor_status = 0;
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*data_set = GSS_C_NO_BUFFER_SET;
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/*
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* For Windows SPNEGO implementations, the initiator or acceptor
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* are presumed to be "buggy" (Windows 2003 or earlier) if an
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* "older" (i.e. pre-AES per RFC 4121) encryption type was used.
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*/
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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old_enctype = ((context_handle->more_flags & IS_CFX) == 0);
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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buffer.value = &old_enctype;
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buffer.length = sizeof(old_enctype);
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return gss_add_buffer_set_member(minor_status, &buffer, data_set);
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}
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/*
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*
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*/
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static OM_uint32
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export_lucid_sec_context_v1(OM_uint32 *minor_status,
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gsskrb5_ctx context_handle,
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krb5_context context,
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gss_buffer_set_t *data_set)
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{
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krb5_storage *sp = NULL;
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OM_uint32 major_status = GSS_S_COMPLETE;
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krb5_error_code ret;
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krb5_keyblock *key = NULL;
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int32_t number;
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int is_cfx;
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krb5_data data;
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*minor_status = 0;
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HEIMDAL_MUTEX_lock(&context_handle->ctx_id_mutex);
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is_cfx = (context_handle->more_flags & IS_CFX);
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sp = krb5_storage_emem();
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if (sp == NULL) {
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_gsskrb5_clear_status();
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ret = ENOMEM;
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goto out;
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}
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ret = krb5_store_int32(sp, 1);
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if (ret) goto out;
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ret = krb5_store_int32(sp, (context_handle->more_flags & LOCAL) ? 1 : 0);
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if (ret) goto out;
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/* XXX need krb5_store_int64() */
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ret = krb5_store_int32(sp, context_handle->endtime);
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if (ret) goto out;
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krb5_auth_con_getlocalseqnumber (context,
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context_handle->auth_context,
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&number);
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ret = krb5_store_uint32(sp, (uint32_t)0); /* store top half as zero */
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if (ret) goto out;
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ret = krb5_store_uint32(sp, (uint32_t)number);
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if (ret) goto out;
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krb5_auth_con_getremoteseqnumber (context,
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context_handle->auth_context,
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&number);
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ret = krb5_store_uint32(sp, (uint32_t)0); /* store top half as zero */
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if (ret) goto out;
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ret = krb5_store_uint32(sp, (uint32_t)number);
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if (ret) goto out;
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ret = krb5_store_int32(sp, (is_cfx) ? 1 : 0);
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if (ret) goto out;
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ret = _gsskrb5i_get_token_key(context_handle, context, &key);
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if (ret) goto out;
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if (is_cfx == 0) {
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int sign_alg, seal_alg;
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switch (key->keytype) {
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case ETYPE_DES_CBC_CRC:
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case ETYPE_DES_CBC_MD4:
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case ETYPE_DES_CBC_MD5:
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sign_alg = 0;
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seal_alg = 0;
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break;
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case ETYPE_DES3_CBC_MD5:
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case ETYPE_DES3_CBC_SHA1:
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sign_alg = 4;
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seal_alg = 2;
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break;
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case ETYPE_ARCFOUR_HMAC_MD5:
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case ETYPE_ARCFOUR_HMAC_MD5_56:
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sign_alg = 17;
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seal_alg = 16;
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break;
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default:
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sign_alg = -1;
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seal_alg = -1;
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break;
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}
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ret = krb5_store_int32(sp, sign_alg);
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if (ret) goto out;
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ret = krb5_store_int32(sp, seal_alg);
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if (ret) goto out;
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/* ctx_key */
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ret = krb5_store_keyblock(sp, *key);
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if (ret) goto out;
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} else {
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int subkey_p = (context_handle->more_flags & ACCEPTOR_SUBKEY) ? 1 : 0;
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/* have_acceptor_subkey */
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ret = krb5_store_int32(sp, subkey_p);
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if (ret) goto out;
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/* ctx_key */
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ret = krb5_store_keyblock(sp, *key);
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if (ret) goto out;
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/* acceptor_subkey */
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if (subkey_p) {
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ret = krb5_store_keyblock(sp, *key);
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if (ret) goto out;
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}
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}
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ret = krb5_storage_to_data(sp, &data);
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if (ret) goto out;
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{
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gss_buffer_desc ad_data;
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ad_data.value = data.data;
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ad_data.length = data.length;
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ret = gss_add_buffer_set_member(minor_status, &ad_data, data_set);
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krb5_data_free(&data);
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if (ret)
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goto out;
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}
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out:
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if (key)
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krb5_free_keyblock (context, key);
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if (sp)
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krb5_storage_free(sp);
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if (ret) {
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*minor_status = ret;
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major_status = GSS_S_FAILURE;
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}
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HEIMDAL_MUTEX_unlock(&context_handle->ctx_id_mutex);
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return major_status;
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}
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static OM_uint32
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get_authtime(OM_uint32 *minor_status,
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gsskrb5_ctx ctx,
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gss_buffer_set_t *data_set)
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{
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gss_buffer_desc value;
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unsigned char buf[4];
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OM_uint32 authtime;
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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if (ctx->ticket == NULL) {
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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_gsskrb5_set_status(EINVAL, "No ticket to obtain auth time from");
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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authtime = ctx->ticket->ticket.authtime;
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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_gsskrb5_encode_om_uint32(authtime, buf);
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value.length = sizeof(buf);
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value.value = buf;
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return gss_add_buffer_set_member(minor_status,
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&value,
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data_set);
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}
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static OM_uint32
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get_service_keyblock
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(OM_uint32 *minor_status,
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gsskrb5_ctx ctx,
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gss_buffer_set_t *data_set)
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{
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krb5_storage *sp = NULL;
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krb5_data data;
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OM_uint32 maj_stat = GSS_S_COMPLETE;
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krb5_error_code ret = EINVAL;
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sp = krb5_storage_emem();
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if (sp == NULL) {
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_gsskrb5_clear_status();
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*minor_status = ENOMEM;
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return GSS_S_FAILURE;
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}
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HEIMDAL_MUTEX_lock(&ctx->ctx_id_mutex);
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if (ctx->service_keyblock == NULL) {
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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krb5_storage_free(sp);
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_gsskrb5_set_status(EINVAL, "No service keyblock on gssapi context");
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*minor_status = EINVAL;
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return GSS_S_FAILURE;
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}
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krb5_data_zero(&data);
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ret = krb5_store_keyblock(sp, *ctx->service_keyblock);
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HEIMDAL_MUTEX_unlock(&ctx->ctx_id_mutex);
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if (ret)
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goto out;
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ret = krb5_storage_to_data(sp, &data);
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if (ret)
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goto out;
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|
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{
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gss_buffer_desc value;
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|
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value.length = data.length;
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value.value = data.data;
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maj_stat = gss_add_buffer_set_member(minor_status,
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&value,
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data_set);
|
|
}
|
|
|
|
out:
|
|
krb5_data_free(&data);
|
|
if (sp)
|
|
krb5_storage_free(sp);
|
|
if (ret) {
|
|
*minor_status = ret;
|
|
maj_stat = GSS_S_FAILURE;
|
|
}
|
|
return maj_stat;
|
|
}
|
|
/*
|
|
*
|
|
*/
|
|
|
|
OM_uint32 GSSAPI_CALLCONV _gsskrb5_inquire_sec_context_by_oid
|
|
(OM_uint32 *minor_status,
|
|
gss_const_ctx_id_t context_handle,
|
|
const gss_OID desired_object,
|
|
gss_buffer_set_t *data_set)
|
|
{
|
|
krb5_context context;
|
|
const gsskrb5_ctx ctx = (const gsskrb5_ctx) context_handle;
|
|
unsigned suffix;
|
|
|
|
if (ctx == NULL) {
|
|
*minor_status = EINVAL;
|
|
return GSS_S_NO_CONTEXT;
|
|
}
|
|
|
|
GSSAPI_KRB5_INIT (&context);
|
|
|
|
if (gss_oid_equal(desired_object, GSS_KRB5_GET_TKT_FLAGS_X)) {
|
|
return inquire_sec_context_tkt_flags(minor_status,
|
|
ctx,
|
|
data_set);
|
|
} else if (gss_oid_equal(desired_object, GSS_C_INQ_PEER_HAS_BUGGY_SPNEGO)) {
|
|
return inquire_sec_context_has_buggy_spnego(minor_status,
|
|
ctx,
|
|
data_set);
|
|
} else if (gss_oid_equal(desired_object, GSS_KRB5_GET_SUBKEY_X)) {
|
|
return inquire_sec_context_get_subkey(minor_status,
|
|
ctx,
|
|
context,
|
|
TOKEN_KEY,
|
|
data_set);
|
|
} else if (gss_oid_equal(desired_object, GSS_KRB5_GET_INITIATOR_SUBKEY_X)) {
|
|
return inquire_sec_context_get_subkey(minor_status,
|
|
ctx,
|
|
context,
|
|
INITIATOR_KEY,
|
|
data_set);
|
|
} else if (gss_oid_equal(desired_object, GSS_KRB5_GET_ACCEPTOR_SUBKEY_X)) {
|
|
return inquire_sec_context_get_subkey(minor_status,
|
|
ctx,
|
|
context,
|
|
ACCEPTOR_KEY,
|
|
data_set);
|
|
} else if (gss_oid_equal(desired_object, GSS_C_INQ_SSPI_SESSION_KEY)) {
|
|
return inquire_sec_context_get_sspi_session_key(minor_status,
|
|
ctx,
|
|
context,
|
|
data_set);
|
|
} else if (gss_oid_equal(desired_object, GSS_KRB5_GET_AUTHTIME_X)) {
|
|
return get_authtime(minor_status, ctx, data_set);
|
|
} else if (oid_prefix_equal(desired_object,
|
|
GSS_KRB5_EXTRACT_AUTHZ_DATA_FROM_SEC_CONTEXT_X,
|
|
&suffix)) {
|
|
return inquire_sec_context_authz_data(minor_status,
|
|
ctx,
|
|
context,
|
|
suffix,
|
|
data_set);
|
|
} else if (oid_prefix_equal(desired_object,
|
|
GSS_KRB5_EXPORT_LUCID_CONTEXT_X,
|
|
&suffix)) {
|
|
if (suffix == 1)
|
|
return export_lucid_sec_context_v1(minor_status,
|
|
ctx,
|
|
context,
|
|
data_set);
|
|
*minor_status = 0;
|
|
return GSS_S_FAILURE;
|
|
} else if (gss_oid_equal(desired_object, GSS_KRB5_GET_SERVICE_KEYBLOCK_X)) {
|
|
return get_service_keyblock(minor_status, ctx, data_set);
|
|
} else {
|
|
*minor_status = 0;
|
|
return GSS_S_FAILURE;
|
|
}
|
|
}
|
|
|