2ffaba9401
Split Windows PAC signing and verification logic, as the signing has to be when the ticket is ready. Create sign and verify the PAC KDC signature if the plugin did not, allowing for S4U2Proxy to work, instead of KRB5SignedPath. Use the header key to verify PAC server signature, as the same key used to encrypt/decrypt the ticket should be used for PAC server signature, like U2U tickets are signed witht the tgt session-key and not with the longterm key, and so krbtgt should be no different and the header key should be used. Lookup the delegated client in DB instead of passing the delegator DB entry. Add PAC ticket-signatures and related functions. Note: due to the change from KRB5SignedPath to PAC, S4U2Proxy requests against new KDC will not work if the evidence ticket was acquired from an old KDC, and vide versa. Closes: #767
125 lines
4.0 KiB
C
125 lines
4.0 KiB
C
/*
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* Copyright (c) 1997-2021 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* Copyright (c) 2021 Isaac Boukris
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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 "krb5_locl.h"
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/*
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* Add the AuthorizationData `data´ of `type´ to the last element in
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* the sequence of authorization_data in `tkt´ wrapped in an IF_RELEVANT
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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_kdc_tkt_add_if_relevant_ad(krb5_context context,
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EncTicketPart *tkt,
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int type,
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const krb5_data *data)
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{
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krb5_error_code ret;
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size_t size = 0;
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if (tkt->authorization_data == NULL) {
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tkt->authorization_data = calloc(1, sizeof(*tkt->authorization_data));
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if (tkt->authorization_data == NULL) {
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return krb5_enomem(context);
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}
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}
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/* add the entry to the last element */
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{
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AuthorizationData ad = { 0, NULL };
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AuthorizationDataElement ade;
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ade.ad_type = type;
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ade.ad_data = *data;
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ret = add_AuthorizationData(&ad, &ade);
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if (ret) {
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krb5_set_error_message(context, ret, "add AuthorizationData failed");
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return ret;
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}
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ade.ad_type = KRB5_AUTHDATA_IF_RELEVANT;
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ASN1_MALLOC_ENCODE(AuthorizationData,
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ade.ad_data.data, ade.ad_data.length,
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&ad, &size, ret);
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free_AuthorizationData(&ad);
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if (ret) {
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krb5_set_error_message(context, ret, "ASN.1 encode of "
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"AuthorizationData failed");
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return ret;
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}
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if (ade.ad_data.length != size)
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krb5_abortx(context, "internal asn.1 encoder error");
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ret = add_AuthorizationData(tkt->authorization_data, &ade);
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der_free_octet_string(&ade.ad_data);
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if (ret) {
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krb5_set_error_message(context, ret, "add AuthorizationData failed");
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return ret;
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}
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}
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return 0;
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}
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/*
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* Insert a PAC wrapped in AD-IF-RELEVANT container as the first AD element,
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* as some clients such as Windows may fail to parse it otherwise.
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*/
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KRB5_LIB_FUNCTION krb5_error_code KRB5_LIB_CALL
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_kdc_tkt_insert_pac(krb5_context context,
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EncTicketPart *tkt,
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const krb5_data *data)
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{
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AuthorizationDataElement ade;
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unsigned int i;
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krb5_error_code ret;
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ret = _kdc_tkt_add_if_relevant_ad(context, tkt, KRB5_AUTHDATA_WIN2K_PAC,
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data);
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if (ret)
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return ret;
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heim_assert(tkt->authorization_data->len != 0, "No authorization_data!");
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ade = tkt->authorization_data->val[tkt->authorization_data->len - 1];
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for (i = 0; i < tkt->authorization_data->len - 1; i++) {
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tkt->authorization_data->val[i + 1] = tkt->authorization_data->val[i];
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}
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tkt->authorization_data->val[0] = ade;
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return 0;
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}
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