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-rw-r--r--source4/heimdal/kdc/524.c400
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diff --git a/source4/heimdal/kdc/524.c b/source4/heimdal/kdc/524.c
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--- a/source4/heimdal/kdc/524.c
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-/*
- * Copyright (c) 1997-2005 Kungliga Tekniska Högskolan
- * (Royal Institute of Technology, Stockholm, Sweden).
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * 3. Neither the name of the Institute nor the names of its contributors
- * may be used to endorse or promote products derived from this software
- * without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include "kdc_locl.h"
-
-RCSID("$Id$");
-
-#include <krb5-v4compat.h>
-
-/*
- * fetch the server from `t', returning the name in malloced memory in
- * `spn' and the entry itself in `server'
- */
-
-static krb5_error_code
-fetch_server (krb5_context context,
- krb5_kdc_configuration *config,
- const Ticket *t,
- char **spn,
- hdb_entry_ex **server,
- const char *from)
-{
- krb5_error_code ret;
- krb5_principal sprinc;
-
- ret = _krb5_principalname2krb5_principal(context, &sprinc,
- t->sname, t->realm);
- if (ret) {
- kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
- krb5_get_err_text(context, ret));
- return ret;
- }
- ret = krb5_unparse_name(context, sprinc, spn);
- if (ret) {
- krb5_free_principal(context, sprinc);
- kdc_log(context, config, 0, "krb5_unparse_name: %s",
- krb5_get_err_text(context, ret));
- return ret;
- }
- ret = _kdc_db_fetch(context, config, sprinc, HDB_F_GET_SERVER,
- NULL, server);
- krb5_free_principal(context, sprinc);
- if (ret) {
- kdc_log(context, config, 0,
- "Request to convert ticket from %s for unknown principal %s: %s",
- from, *spn, krb5_get_err_text(context, ret));
- if (ret == HDB_ERR_NOENTRY)
- ret = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
- return ret;
- }
- return 0;
-}
-
-static krb5_error_code
-log_524 (krb5_context context,
- krb5_kdc_configuration *config,
- const EncTicketPart *et,
- const char *from,
- const char *spn)
-{
- krb5_principal client;
- char *cpn;
- krb5_error_code ret;
-
- ret = _krb5_principalname2krb5_principal(context, &client,
- et->cname, et->crealm);
- if (ret) {
- kdc_log(context, config, 0, "_krb5_principalname2krb5_principal: %s",
- krb5_get_err_text (context, ret));
- return ret;
- }
- ret = krb5_unparse_name(context, client, &cpn);
- if (ret) {
- krb5_free_principal(context, client);
- kdc_log(context, config, 0, "krb5_unparse_name: %s",
- krb5_get_err_text (context, ret));
- return ret;
- }
- kdc_log(context, config, 1, "524-REQ %s from %s for %s", cpn, from, spn);
- free(cpn);
- krb5_free_principal(context, client);
- return 0;
-}
-
-static krb5_error_code
-verify_flags (krb5_context context,
- krb5_kdc_configuration *config,
- const EncTicketPart *et,
- const char *spn)
-{
- if(et->endtime < kdc_time){
- kdc_log(context, config, 0, "Ticket expired (%s)", spn);
- return KRB5KRB_AP_ERR_TKT_EXPIRED;
- }
- if(et->flags.invalid){
- kdc_log(context, config, 0, "Ticket not valid (%s)", spn);
- return KRB5KRB_AP_ERR_TKT_NYV;
- }
- return 0;
-}
-
-/*
- * set the `et->caddr' to the most appropriate address to use, where
- * `addr' is the address the request was received from.
- */
-
-static krb5_error_code
-set_address (krb5_context context,
- krb5_kdc_configuration *config,
- EncTicketPart *et,
- struct sockaddr *addr,
- const char *from)
-{
- krb5_error_code ret;
- krb5_address *v4_addr;
-
- v4_addr = malloc (sizeof(*v4_addr));
- if (v4_addr == NULL)
- return ENOMEM;
-
- ret = krb5_sockaddr2address(context, addr, v4_addr);
- if(ret) {
- free (v4_addr);
- kdc_log(context, config, 0, "Failed to convert address (%s)", from);
- return ret;
- }
-
- if (et->caddr && !krb5_address_search (context, v4_addr, et->caddr)) {
- kdc_log(context, config, 0, "Incorrect network address (%s)", from);
- krb5_free_address(context, v4_addr);
- free (v4_addr);
- return KRB5KRB_AP_ERR_BADADDR;
- }
- if(v4_addr->addr_type == KRB5_ADDRESS_INET) {
- /* we need to collapse the addresses in the ticket to a
- single address; best guess is to use the address the
- connection came from */
-
- if (et->caddr != NULL) {
- free_HostAddresses(et->caddr);
- } else {
- et->caddr = malloc (sizeof (*et->caddr));
- if (et->caddr == NULL) {
- krb5_free_address(context, v4_addr);
- free(v4_addr);
- return ENOMEM;
- }
- }
- et->caddr->val = v4_addr;
- et->caddr->len = 1;
- } else {
- krb5_free_address(context, v4_addr);
- free(v4_addr);
- }
- return 0;
-}
-
-
-static krb5_error_code
-encrypt_v4_ticket(krb5_context context,
- krb5_kdc_configuration *config,
- void *buf,
- size_t len,
- krb5_keyblock *skey,
- EncryptedData *reply)
-{
- krb5_crypto crypto;
- krb5_error_code ret;
- ret = krb5_crypto_init(context, skey, ETYPE_DES_PCBC_NONE, &crypto);
- if (ret) {
- free(buf);
- kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
- krb5_get_err_text(context, ret));
- return ret;
- }
-
- ret = krb5_encrypt_EncryptedData(context,
- crypto,
- KRB5_KU_TICKET,
- buf,
- len,
- 0,
- reply);
- krb5_crypto_destroy(context, crypto);
- if(ret) {
- kdc_log(context, config, 0, "Failed to encrypt data: %s",
- krb5_get_err_text(context, ret));
- return ret;
- }
- return 0;
-}
-
-static krb5_error_code
-encode_524_response(krb5_context context,
- krb5_kdc_configuration *config,
- const char *spn, const EncTicketPart et,
- const Ticket *t, hdb_entry_ex *server,
- EncryptedData *ticket, int *kvno)
-{
- krb5_error_code ret;
- int use_2b;
- size_t len;
-
- use_2b = krb5_config_get_bool(context, NULL, "kdc", "use_2b", spn, NULL);
- if(use_2b) {
- ASN1_MALLOC_ENCODE(EncryptedData,
- ticket->cipher.data, ticket->cipher.length,
- &t->enc_part, &len, ret);
-
- if (ret) {
- kdc_log(context, config, 0,
- "Failed to encode v4 (2b) ticket (%s)", spn);
- return ret;
- }
-
- ticket->etype = 0;
- ticket->kvno = NULL;
- *kvno = 213; /* 2b's use this magic kvno */
- } else {
- unsigned char buf[MAX_KTXT_LEN + 4 * 4];
- Key *skey;
-
- if (!config->enable_v4_cross_realm && strcmp (et.crealm, t->realm) != 0) {
- kdc_log(context, config, 0, "524 cross-realm %s -> %s disabled", et.crealm,
- t->realm);
- return KRB5KDC_ERR_POLICY;
- }
-
- ret = _kdc_encode_v4_ticket(context, config,
- buf + sizeof(buf) - 1, sizeof(buf),
- &et, &t->sname, &len);
- if(ret){
- kdc_log(context, config, 0,
- "Failed to encode v4 ticket (%s)", spn);
- return ret;
- }
- ret = _kdc_get_des_key(context, server, TRUE, FALSE, &skey);
- if(ret){
- kdc_log(context, config, 0,
- "no suitable DES key for server (%s)", spn);
- return ret;
- }
- ret = encrypt_v4_ticket(context, config, buf + sizeof(buf) - len, len,
- &skey->key, ticket);
- if(ret){
- kdc_log(context, config, 0,
- "Failed to encrypt v4 ticket (%s)", spn);
- return ret;
- }
- *kvno = server->entry.kvno;
- }
-
- return 0;
-}
-
-/*
- * process a 5->4 request, based on `t', and received `from, addr',
- * returning the reply in `reply'
- */
-
-krb5_error_code
-_kdc_do_524(krb5_context context,
- krb5_kdc_configuration *config,
- const Ticket *t, krb5_data *reply,
- const char *from, struct sockaddr *addr)
-{
- krb5_error_code ret = 0;
- krb5_crypto crypto;
- hdb_entry_ex *server = NULL;
- Key *skey;
- krb5_data et_data;
- EncTicketPart et;
- EncryptedData ticket;
- krb5_storage *sp;
- char *spn = NULL;
- unsigned char buf[MAX_KTXT_LEN + 4 * 4];
- size_t len;
- int kvno = 0;
-
- if(!config->enable_524) {
- ret = KRB5KDC_ERR_POLICY;
- kdc_log(context, config, 0,
- "Rejected ticket conversion request from %s", from);
- goto out;
- }
-
- ret = fetch_server (context, config, t, &spn, &server, from);
- if (ret) {
- goto out;
- }
-
- ret = hdb_enctype2key(context, &server->entry, t->enc_part.etype, &skey);
- if(ret){
- kdc_log(context, config, 0,
- "No suitable key found for server (%s) from %s", spn, from);
- goto out;
- }
- ret = krb5_crypto_init(context, &skey->key, 0, &crypto);
- if (ret) {
- kdc_log(context, config, 0, "krb5_crypto_init failed: %s",
- krb5_get_err_text(context, ret));
- goto out;
- }
- ret = krb5_decrypt_EncryptedData (context,
- crypto,
- KRB5_KU_TICKET,
- &t->enc_part,
- &et_data);
- krb5_crypto_destroy(context, crypto);
- if(ret){
- kdc_log(context, config, 0,
- "Failed to decrypt ticket from %s for %s", from, spn);
- goto out;
- }
- ret = krb5_decode_EncTicketPart(context, et_data.data, et_data.length,
- &et, &len);
- krb5_data_free(&et_data);
- if(ret){
- kdc_log(context, config, 0,
- "Failed to decode ticket from %s for %s", from, spn);
- goto out;
- }
-
- ret = log_524 (context, config, &et, from, spn);
- if (ret) {
- free_EncTicketPart(&et);
- goto out;
- }
-
- ret = verify_flags (context, config, &et, spn);
- if (ret) {
- free_EncTicketPart(&et);
- goto out;
- }
-
- ret = set_address (context, config, &et, addr, from);
- if (ret) {
- free_EncTicketPart(&et);
- goto out;
- }
-
- ret = encode_524_response(context, config, spn, et, t,
- server, &ticket, &kvno);
- free_EncTicketPart(&et);
-
- out:
- /* make reply */
- memset(buf, 0, sizeof(buf));
- sp = krb5_storage_from_mem(buf, sizeof(buf));
- if (sp) {
- krb5_store_int32(sp, ret);
- if(ret == 0){
- krb5_store_int32(sp, kvno);
- krb5_store_data(sp, ticket.cipher);
- /* Aargh! This is coded as a KTEXT_ST. */
- krb5_storage_seek(sp, MAX_KTXT_LEN - ticket.cipher.length, SEEK_CUR);
- krb5_store_int32(sp, 0); /* mbz */
- free_EncryptedData(&ticket);
- }
- ret = krb5_storage_to_data(sp, reply);
- reply->length = krb5_storage_seek(sp, 0, SEEK_CUR);
- krb5_storage_free(sp);
- } else
- krb5_data_zero(reply);
- if(spn)
- free(spn);
- if(server)
- _kdc_free_ent (context, server);
- return ret;
-}
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