/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* kdc/do_as_req.c */
/*
* Portions Copyright (C) 2007 Apple Inc.
* Copyright 1990, 1991, 2007, 2008, 2009, 2013, 2014 by the
* Massachusetts Institute of Technology. All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* KDC Routines to deal with AS_REQ's
*/
/*
* Copyright (c) 2006-2008, Novell, Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* * Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
* * 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.
* * The copyright holder's name is not used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER 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 "k5-int.h"
#include "com_err.h"
#include <syslog.h>
#ifdef HAVE_NETINET_IN_H
#include <sys/types.h>
#include <netinet/in.h>
#ifndef hpux
#include <arpa/inet.h>
#endif /* hpux */
#endif /* HAVE_NETINET_IN_H */
#include "kdc_util.h"
#include "kdc_audit.h"
#include "policy.h"
#include <kadm5/admin.h>
#include "adm_proto.h"
#include "extern.h"
static krb5_error_code
prepare_error_as(struct kdc_request_state *, krb5_kdc_req *, krb5_db_entry *,
krb5_keyblock *, int, krb5_pa_data **, krb5_boolean,
krb5_principal, krb5_data **, const char *);
/* Determine the key-expiration value according to RFC 4120 section 5.4.2. */
static krb5_timestamp
get_key_exp(krb5_db_entry *entry)
{
if (entry->expiration == 0)
return entry->pw_expiration;
if (entry->pw_expiration == 0)
return entry->expiration;
return ts_min(entry->expiration, entry->pw_expiration);
}
/*
* Find the key in client for the most preferred enctype in req_enctypes. Fill
* in *kb_out with the decrypted keyblock (which the caller must free) and set
* *kd_out to an alias to that key data entry. Set *kd_out to NULL and leave
* *kb_out zeroed if no key is found for any of the requested enctypes.
* kb_out->enctype may differ from the enctype of *kd_out for DES enctypes; in
* this case, kb_out->enctype is the requested enctype used to match the key
* data entry.
*/
static krb5_error_code
select_client_key(krb5_context context, krb5_db_entry *client,
krb5_enctype *req_enctypes, int n_req_enctypes,
krb5_keyblock *kb_out, krb5_key_data **kd_out)
{
krb5_error_code ret;
krb5_key_data *kd;
krb5_enctype etype;
int i;
memset(kb_out, 0, sizeof(*kb_out));
*kd_out = NULL;
for (i = 0; i < n_req_enctypes; i++) {
etype = req_enctypes[i];
if (!krb5_c_valid_enctype(etype))
continue;
if (krb5_dbe_find_enctype(context, client, etype, -1, 0, &kd) == 0) {
/* Decrypt the client key data and set its enctype to the request
* enctype (which may differ from the key data enctype for DES). */
ret = krb5_dbe_decrypt_key_data(context, NULL, kd, kb_out, NULL);
if (ret)
return ret;
kb_out->enctype = etype;
*kd_out = kd;
return 0;
}
}
return 0;
}
static krb5_error_code
lookup_client(krb5_context context, krb5_kdc_req *req, unsigned int flags,
krb5_db_entry **entry_out)
{
krb5_pa_data *pa;
krb5_data cert;
*entry_out = NULL;
pa = krb5int_find_pa_data(context, req->padata, KRB5_PADATA_S4U_X509_USER);
if (pa != NULL && pa->length != 0 &&
req->client->type == KRB5_NT_X500_PRINCIPAL) {
cert = make_data(pa->contents, pa->length);
return krb5_db_get_s4u_x509_principal(context, &cert, req->client,
flags, entry_out);
} else {
return krb5_db_get_principal(context, req->client, flags, entry_out);
}
}
struct as_req_state {
loop_respond_fn respond;
void *arg;
krb5_principal_data client_princ;
krb5_enc_tkt_part enc_tkt_reply;
krb5_enc_kdc_rep_part reply_encpart;
krb5_ticket ticket_reply;
krb5_keyblock local_tgt_key;
krb5_keyblock server_keyblock;
krb5_keyblock client_keyblock;
krb5_db_entry *client;
krb5_db_entry *server;
krb5_db_entry *local_tgt;
krb5_db_entry *local_tgt_storage;
krb5_key_data *client_key;
krb5_kdc_req *request;
struct krb5_kdcpreauth_rock_st rock;
const char *status;
krb5_pa_data **e_data;
krb5_boolean typed_e_data;
krb5_kdc_rep reply;
krb5_timestamp kdc_time;
krb5_keyblock session_key;
unsigned int c_flags;
krb5_data *req_pkt;
krb5_data *inner_body;
struct kdc_request_state *rstate;
char *sname, *cname;
void *pa_context;
const krb5_fulladdr *local_addr;
const krb5_fulladdr *remote_addr;
krb5_data **auth_indicators;
krb5_error_code preauth_err;
kdc_realm_t *active_realm;
krb5_audit_state *au_state;
};
static void
finish_process_as_req(struct as_req_state *state, krb5_error_code errcode)
{
krb5_key_data *server_key;
krb5_keyblock *as_encrypting_key = NULL;
krb5_data *response = NULL;
const char *emsg = 0;
int did_log = 0;
loop_respond_fn oldrespond;
void *oldarg;
kdc_realm_t *kdc_active_realm = state->active_realm;
krb5_audit_state *au_state = state->au_state;
assert(state);
oldrespond = state->respond;
oldarg = state->arg;
if (errcode)
goto egress;
au_state->stage = ENCR_REP;
state->ticket_reply.enc_part2 = &state->enc_tkt_reply;
errcode = check_kdcpolicy_as(kdc_context, state->request, state->client,
state->server, state->auth_indicators,
state->kdc_time, &state->enc_tkt_reply.times,
&state->status);
if (errcode)
goto egress;
/*
* Find the server key
*/
if ((errcode = krb5_dbe_find_enctype(kdc_context, state->server,
-1, /* ignore keytype */
-1, /* Ignore salttype */
0, /* Get highest kvno */
&server_key))) {
state->status = "FINDING_SERVER_KEY";
goto egress;
}
/*
* Convert server->key into a real key
* (it may be encrypted in the database)
*
* server_keyblock is later used to generate auth data signatures
*/
if ((errcode = krb5_dbe_decrypt_key_data(kdc_context, NULL,
server_key,
&state->server_keyblock,
NULL))) {
state->status = "DECRYPT_SERVER_KEY";
goto egress;
}
/* Start assembling the response */
state->reply.msg_type = KRB5_AS_REP;
state->reply.client = state->enc_tkt_reply.client; /* post canonization */
state->reply.ticket = &state->ticket_reply;
state->reply_encpart.session = &state->session_key;
if ((errcode = fetch_last_req_info(state->client,
&state->reply_encpart.last_req)))
goto egress;
state->reply_encpart.nonce = state->request->nonce;
state->reply_encpart.key_exp = get_key_exp(state->client);
state->reply_encpart.flags = state->enc_tkt_reply.flags;
state->reply_encpart.server = state->ticket_reply.server;
state->reply_encpart.times = state->enc_tkt_reply.times;
state->reply_encpart.caddrs = state->enc_tkt_reply.caddrs;
state->reply_encpart.enc_padata = NULL;
/* Fetch the padata info to be returned (do this before
* authdata to handle possible replacement of reply key
*/
errcode = return_padata(kdc_context, &state->rock, state->req_pkt,
state->request, &state->reply,
&state->client_keyblock, &state->pa_context);
if (errcode) {
state->status = "KDC_RETURN_PADATA";
goto egress;
}
/* If we didn't find a client long-term key and no preauth mechanism
* replaced the reply key, error out now. */
if (state->client_keyblock.enctype == ENCTYPE_NULL) {
state->status = "CANT_FIND_CLIENT_KEY";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
goto egress;
}
errcode = handle_authdata(kdc_context, state->c_flags, state->client,
state->server, NULL, state->local_tgt,
&state->local_tgt_key, &state->client_keyblock,
&state->server_keyblock, NULL, state->req_pkt,
state->request, NULL, NULL, NULL,
&state->auth_indicators, &state->enc_tkt_reply);
if (errcode) {
krb5_klog_syslog(LOG_INFO, _("AS_REQ : handle_authdata (%d)"),
errcode);
state->status = "HANDLE_AUTHDATA";
goto egress;
}
errcode = check_indicators(kdc_context, state->server,
state->auth_indicators);
if (errcode) {
state->status = "HIGHER_AUTHENTICATION_REQUIRED";
goto egress;
}
errcode = krb5_encrypt_tkt_part(kdc_context, &state->server_keyblock,
&state->ticket_reply);
if (errcode)
goto egress;
errcode = kau_make_tkt_id(kdc_context, &state->ticket_reply,
&au_state->tkt_out_id);
if (errcode)
goto egress;
state->ticket_reply.enc_part.kvno = server_key->key_data_kvno;
errcode = kdc_fast_response_handle_padata(state->rstate,
state->request,
&state->reply,
state->client_keyblock.enctype);
if (errcode)
goto egress;
/* now encode/encrypt the response */
state->reply.enc_part.enctype = state->client_keyblock.enctype;
errcode = kdc_fast_handle_reply_key(state->rstate, &state->client_keyblock,
&as_encrypting_key);
if (errcode)
goto egress;
errcode = return_enc_padata(kdc_context, state->req_pkt, state->request,
as_encrypting_key, state->server,
&state->reply_encpart, FALSE);
if (errcode) {
state->status = "KDC_RETURN_ENC_PADATA";
goto egress;
}
if (kdc_fast_hide_client(state->rstate))
state->reply.client = (krb5_principal)krb5_anonymous_principal();
errcode = krb5_encode_kdc_rep(kdc_context, KRB5_AS_REP,
&state->reply_encpart, 0,
as_encrypting_key,
&state->reply, &response);
if (state->client_key != NULL)
state->reply.enc_part.kvno = state->client_key->key_data_kvno;
if (errcode)
goto egress;
/* these parts are left on as a courtesy from krb5_encode_kdc_rep so we
can use them in raw form if needed. But, we don't... */
memset(state->reply.enc_part.ciphertext.data, 0,
state->reply.enc_part.ciphertext.length);
free(state->reply.enc_part.ciphertext.data);
log_as_req(kdc_context, state->local_addr, state->remote_addr,
state->request, &state->reply, state->client, state->cname,
state->server, state->sname, state->kdc_time, 0, 0, 0);
did_log = 1;
egress:
if (errcode != 0 && state->status == NULL)
state->status = "UNKNOWN_REASON";
au_state->status = state->status;
au_state->reply = &state->reply;
kau_as_req(kdc_context,
(errcode || state->preauth_err) ? FALSE : TRUE, au_state);
kau_free_kdc_req(au_state);
free_padata_context(kdc_context, state->pa_context);
if (as_encrypting_key)
krb5_free_keyblock(kdc_context, as_encrypting_key);
if (errcode)
emsg = krb5_get_error_message(kdc_context, errcode);
if (state->status) {
log_as_req(kdc_context, state->local_addr, state->remote_addr,
state->request, &state->reply, state->client,
state->cname, state->server, state->sname, state->kdc_time,
state->status, errcode, emsg);
did_log = 1;
}
if (errcode) {
if (state->status == 0) {
state->status = emsg;
}
if (errcode != KRB5KDC_ERR_DISCARD) {
errcode -= ERROR_TABLE_BASE_krb5;
if (errcode < 0 || errcode > KRB_ERR_MAX)
errcode = KRB_ERR_GENERIC;
errcode = prepare_error_as(state->rstate, state->request,
state->local_tgt, &state->local_tgt_key,
errcode, state->e_data,
state->typed_e_data,
((state->client != NULL) ?
state->client->princ : NULL),
&response, state->status);
state->status = 0;
}
}
if (emsg)
krb5_free_error_message(kdc_context, emsg);
if (state->enc_tkt_reply.authorization_data != NULL)
krb5_free_authdata(kdc_context,
state->enc_tkt_reply.authorization_data);
if (state->local_tgt_key.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->local_tgt_key);
if (state->server_keyblock.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->server_keyblock);
if (state->client_keyblock.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->client_keyblock);
if (state->reply.padata != NULL)
krb5_free_pa_data(kdc_context, state->reply.padata);
if (state->reply_encpart.enc_padata)
krb5_free_pa_data(kdc_context, state->reply_encpart.enc_padata);
if (state->cname != NULL)
free(state->cname);
if (state->sname != NULL)
free(state->sname);
krb5_db_free_principal(kdc_context, state->client);
krb5_db_free_principal(kdc_context, state->server);
krb5_db_free_principal(kdc_context, state->local_tgt_storage);
if (state->session_key.contents != NULL)
krb5_free_keyblock_contents(kdc_context, &state->session_key);
if (state->ticket_reply.enc_part.ciphertext.data != NULL) {
memset(state->ticket_reply.enc_part.ciphertext.data , 0,
state->ticket_reply.enc_part.ciphertext.length);
free(state->ticket_reply.enc_part.ciphertext.data);
}
krb5_free_pa_data(kdc_context, state->e_data);
krb5_free_data(kdc_context, state->inner_body);
kdc_free_rstate(state->rstate);
krb5_free_kdc_req(kdc_context, state->request);
k5_free_data_ptr_list(state->auth_indicators);
assert(did_log != 0);
free(state);
(*oldrespond)(oldarg, errcode, response);
}
static void
finish_missing_required_preauth(void *arg)
{
struct as_req_state *state = (struct as_req_state *)arg;
finish_process_as_req(state, state->preauth_err);
}
static void
finish_preauth(void *arg, krb5_error_code code)
{
struct as_req_state *state = arg;
krb5_error_code real_code = code;
if (code) {
if (vague_errors)
code = KRB5KRB_ERR_GENERIC;
state->status = "PREAUTH_FAILED";
if (real_code == KRB5KDC_ERR_PREAUTH_FAILED) {
state->preauth_err = code;
get_preauth_hint_list(state->request, &state->rock, &state->e_data,
finish_missing_required_preauth, state);
return;
}
} else {
/*
* Final check before handing out ticket: If the client requires
* preauthentication, verify that the proper kind of
* preauthentication was carried out.
*/
state->status = missing_required_preauth(state->client, state->server,
&state->enc_tkt_reply);
if (state->status) {
state->preauth_err = KRB5KDC_ERR_PREAUTH_REQUIRED;
get_preauth_hint_list(state->request, &state->rock, &state->e_data,
finish_missing_required_preauth, state);
return;
}
}
finish_process_as_req(state, code);
}
/*ARGSUSED*/
void
process_as_req(krb5_kdc_req *request, krb5_data *req_pkt,
const krb5_fulladdr *local_addr,
const krb5_fulladdr *remote_addr, kdc_realm_t *kdc_active_realm,
verto_ctx *vctx, loop_respond_fn respond, void *arg)
{
krb5_error_code errcode;
unsigned int s_flags = 0;
krb5_data encoded_req_body;
krb5_enctype useenctype;
struct as_req_state *state;
krb5_audit_state *au_state = NULL;
state = k5alloc(sizeof(*state), &errcode);
if (state == NULL) {
(*respond)(arg, errcode, NULL);
return;
}
state->respond = respond;
state->arg = arg;
state->request = request;
state->req_pkt = req_pkt;
state->local_addr = local_addr;
state->remote_addr = remote_addr;
state->active_realm = kdc_active_realm;
errcode = kdc_make_rstate(kdc_active_realm, &state->rstate);
if (errcode != 0) {
(*respond)(arg, errcode, NULL);
free(state);
return;
}
/* Initialize audit state. */
errcode = kau_init_kdc_req(kdc_context, state->request, remote_addr,
&au_state);
if (errcode) {
(*respond)(arg, errcode, NULL);
kdc_free_rstate(state->rstate);
free(state);
return;
}
state->au_state = au_state;
if (state->request->msg_type != KRB5_AS_REQ) {
state->status = "VALIDATE_MESSAGE_TYPE";
errcode = KRB5_BADMSGTYPE;
goto errout;
}
/* Seed the audit trail with the request ID and basic information. */
kau_as_req(kdc_context, TRUE, au_state);
errcode = krb5_timeofday(kdc_context, &state->kdc_time);
if (errcode)
goto errout;
if (fetch_asn1_field((unsigned char *) req_pkt->data,
1, 4, &encoded_req_body) != 0) {
errcode = ASN1_BAD_ID;
goto errout;
}
errcode = kdc_find_fast(&state->request, &encoded_req_body, NULL, NULL,
state->rstate, &state->inner_body);
if (errcode) {
state->status = "FIND_FAST";
goto errout;
}
if (state->inner_body == NULL) {
/* Not a FAST request; copy the encoded request body. */
errcode = krb5_copy_data(kdc_context, &encoded_req_body,
&state->inner_body);
if (errcode)
goto errout;
}
au_state->request = state->request;
state->rock.request = state->request;
state->rock.inner_body = state->inner_body;
state->rock.rstate = state->rstate;
state->rock.vctx = vctx;
state->rock.auth_indicators = &state->auth_indicators;
state->rock.send_freshness_token = FALSE;
if (!state->request->client) {
state->status = "NULL_CLIENT";
errcode = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto errout;
}
if ((errcode = krb5_unparse_name(kdc_context,
state->request->client,
&state->cname)))
goto errout;
limit_string(state->cname);
if (!state->request->server) {
state->status = "NULL_SERVER";
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto errout;
}
if ((errcode = krb5_unparse_name(kdc_context,
state->request->server,
&state->sname)))
goto errout;
limit_string(state->sname);
/*
* We set KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY as a hint
* to the backend to return naming information in lieu
* of cross realm TGS entries.
*/
setflag(state->c_flags, KRB5_KDB_FLAG_CLIENT_REFERRALS_ONLY);
if (isflagset(state->request->kdc_options, KDC_OPT_CANONICALIZE)) {
setflag(state->c_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
if (include_pac_p(kdc_context, state->request)) {
setflag(state->c_flags, KRB5_KDB_FLAG_INCLUDE_PAC);
}
errcode = lookup_client(kdc_context, state->request, state->c_flags,
&state->client);
if (errcode == KRB5_KDB_CANTLOCK_DB)
errcode = KRB5KDC_ERR_SVC_UNAVAILABLE;
if (errcode == KRB5_KDB_NOENTRY) {
state->status = "CLIENT_NOT_FOUND";
if (vague_errors)
errcode = KRB5KRB_ERR_GENERIC;
else
errcode = KRB5KDC_ERR_C_PRINCIPAL_UNKNOWN;
goto errout;
} else if (errcode) {
state->status = "LOOKING_UP_CLIENT";
goto errout;
}
state->rock.client = state->client;
/*
* If the backend returned a principal that is not in the local
* realm, then we need to refer the client to that realm.
*/
if (!is_local_principal(kdc_active_realm, state->client->princ)) {
/* Entry is a referral to another realm */
state->status = "REFERRAL";
au_state->cl_realm = &state->client->princ->realm;
errcode = KRB5KDC_ERR_WRONG_REALM;
goto errout;
}
au_state->stage = SRVC_PRINC;
s_flags = 0;
if (isflagset(state->request->kdc_options, KDC_OPT_CANONICALIZE)) {
setflag(s_flags, KRB5_KDB_FLAG_CANONICALIZE);
}
errcode = krb5_db_get_principal(kdc_context, state->request->server,
s_flags, &state->server);
if (errcode == KRB5_KDB_CANTLOCK_DB)
errcode = KRB5KDC_ERR_SVC_UNAVAILABLE;
if (errcode == KRB5_KDB_NOENTRY) {
state->status = "SERVER_NOT_FOUND";
errcode = KRB5KDC_ERR_S_PRINCIPAL_UNKNOWN;
goto errout;
} else if (errcode) {
state->status = "LOOKING_UP_SERVER";
goto errout;
}
errcode = get_local_tgt(kdc_context, &state->request->server->realm,
state->server, &state->local_tgt,
&state->local_tgt_storage, &state->local_tgt_key);
if (errcode) {
state->status = "GET_LOCAL_TGT";
goto errout;
}
state->rock.local_tgt = state->local_tgt;
au_state->stage = VALIDATE_POL;
if ((errcode = validate_as_request(kdc_active_realm,
state->request, *state->client,
*state->server, state->kdc_time,
&state->status, &state->e_data))) {
errcode += ERROR_TABLE_BASE_krb5;
goto errout;
}
au_state->stage = ISSUE_TKT;
/*
* Select the keytype for the ticket session key.
*/
if ((useenctype = select_session_keytype(kdc_active_realm, state->server,
state->request->nktypes,
state->request->ktype)) == 0) {
/* unsupported ktype */
state->status = "BAD_ENCRYPTION_TYPE";
errcode = KRB5KDC_ERR_ETYPE_NOSUPP;
goto errout;
}
if ((errcode = krb5_c_make_random_key(kdc_context, useenctype,
&state->session_key)))
goto errout;
/*
* Canonicalization is only effective if we are issuing a TGT
* (the intention is to allow support for Windows "short" realm
* aliases, nothing more).
*/
if (isflagset(s_flags, KRB5_KDB_FLAG_CANONICALIZE) &&
krb5_is_tgs_principal(state->request->server) &&
krb5_is_tgs_principal(state->server->princ)) {
state->ticket_reply.server = state->server->princ;
} else {
state->ticket_reply.server = state->request->server;
}
/* Copy options that request the corresponding ticket flags. */
state->enc_tkt_reply.flags = get_ticket_flags(state->request->kdc_options,
state->client, state->server,
NULL);
state->enc_tkt_reply.times.authtime = state->kdc_time;
/*
* It should be noted that local policy may affect the
* processing of any of these flags. For example, some
* realms may refuse to issue renewable tickets
*/
state->enc_tkt_reply.session = &state->session_key;
if (isflagset(state->c_flags, KRB5_KDB_FLAG_CANONICALIZE)) {
state->client_princ = *(state->client->princ);
} else {
state->client_princ = *(state->request->client);
/* The realm is always canonicalized */
state->client_princ.realm = state->client->princ->realm;
}
state->enc_tkt_reply.client = &state->client_princ;
state->enc_tkt_reply.transited.tr_type = KRB5_DOMAIN_X500_COMPRESS;
state->enc_tkt_reply.transited.tr_contents = empty_string;
if (isflagset(state->request->kdc_options, KDC_OPT_POSTDATED))
state->enc_tkt_reply.times.starttime = state->request->from;
else
state->enc_tkt_reply.times.starttime = state->kdc_time;
kdc_get_ticket_endtime(kdc_active_realm,
state->enc_tkt_reply.times.starttime,
kdc_infinity, state->request->till, state->client,
state->server, &state->enc_tkt_reply.times.endtime);
kdc_get_ticket_renewtime(kdc_active_realm, state->request, NULL,
state->client, state->server,
&state->enc_tkt_reply);
/*
* starttime is optional, and treated as authtime if not present.
* so we can nuke it if it matches
*/
if (state->enc_tkt_reply.times.starttime ==
state->enc_tkt_reply.times.authtime)
state->enc_tkt_reply.times.starttime = 0;
state->enc_tkt_reply.caddrs = state->request->addresses;
state->enc_tkt_reply.authorization_data = 0;
/* If anonymous requests are being used, adjust the realm of the client
* principal. */
if (isflagset(state->request->kdc_options, KDC_OPT_REQUEST_ANONYMOUS)) {
if (!krb5_principal_compare_any_realm(kdc_context,
state->request->client,
krb5_anonymous_principal())) {
errcode = KRB5KDC_ERR_BADOPTION;
/* Anonymous requested but anonymous principal not used.*/
state->status = "VALIDATE_ANONYMOUS_PRINCIPAL";
goto errout;
}
krb5_free_principal(kdc_context, state->request->client);
state->request->client = NULL;
errcode = krb5_copy_principal(kdc_context, krb5_anonymous_principal(),
&state->request->client);
if (errcode)
goto errout;
state->enc_tkt_reply.client = state->request->client;
setflag(state->client->attributes, KRB5_KDB_REQUIRES_PRE_AUTH);
}
errcode = select_client_key(kdc_context, state->client,
state->request->ktype, state->request->nktypes,
&state->client_keyblock, &state->client_key);
if (errcode) {
state->status = "DECRYPT_CLIENT_KEY";
goto errout;
}
if (state->client_key != NULL) {
state->rock.client_key = state->client_key;
state->rock.client_keyblock = &state->client_keyblock;
}
errcode = kdc_fast_read_cookie(kdc_context, state->rstate, state->request,
state->local_tgt, &state->local_tgt_key);
if (errcode) {
state->status = "READ_COOKIE";
goto errout;
}
/*
* Check the preauthentication if it is there.
*/
if (state->request->padata) {
check_padata(kdc_context, &state->rock, state->req_pkt,
state->request, &state->enc_tkt_reply, &state->pa_context,
&state->e_data, &state->typed_e_data, finish_preauth,
state);
} else
finish_preauth(state, 0);
return;
errout:
finish_process_as_req(state, errcode);
}
static krb5_error_code
prepare_error_as(struct kdc_request_state *rstate, krb5_kdc_req *request,
krb5_db_entry *local_tgt, krb5_keyblock *local_tgt_key,
int error, krb5_pa_data **e_data_in,
krb5_boolean typed_e_data, krb5_principal canon_client,
krb5_data **response, const char *status)
{
krb5_error errpkt;
krb5_error_code retval;
krb5_data *scratch = NULL, *e_data_asn1 = NULL, *fast_edata = NULL;
krb5_pa_data **e_data = NULL, *cookie = NULL;
kdc_realm_t *kdc_active_realm = rstate->realm_data;
size_t count;
errpkt.magic = KV5M_ERROR;
if (e_data_in != NULL) {
/* Add a PA-FX-COOKIE to e_data_in. e_data is a shallow copy
* containing aliases. */
for (count = 0; e_data_in[count] != NULL; count++);
e_data = calloc(count + 2, sizeof(*e_data));
if (e_data == NULL)
return ENOMEM;
memcpy(e_data, e_data_in, count * sizeof(*e_data));
retval = kdc_fast_make_cookie(kdc_context, rstate, local_tgt,
local_tgt_key, request->client,
&cookie);
e_data[count] = cookie;
}
errpkt.ctime = 0;
errpkt.cusec = 0;
retval = krb5_us_timeofday(kdc_context, &errpkt.stime, &errpkt.susec);
if (retval)
goto cleanup;
errpkt.error = error;
errpkt.server = request->server;
errpkt.client = (error == KDC_ERR_WRONG_REALM) ? canon_client :
request->client;
errpkt.text = string2data((char *)status);
if (e_data != NULL) {
if (typed_e_data)
retval = encode_krb5_typed_data(e_data, &e_data_asn1);
else
retval = encode_krb5_padata_sequence(e_data, &e_data_asn1);
if (retval)
goto cleanup;
errpkt.e_data = *e_data_asn1;
} else
errpkt.e_data = empty_data();
retval = kdc_fast_handle_error(kdc_context, rstate, request, e_data,
&errpkt, &fast_edata);
if (retval)
goto cleanup;
if (fast_edata != NULL)
errpkt.e_data = *fast_edata;
scratch = k5alloc(sizeof(*scratch), &retval);
if (scratch == NULL)
goto cleanup;
if (kdc_fast_hide_client(rstate) && errpkt.client != NULL)
errpkt.client = (krb5_principal)krb5_anonymous_principal();
retval = krb5_mk_error(kdc_context, &errpkt, scratch);
if (retval)
goto cleanup;
*response = scratch;
scratch = NULL;
cleanup:
krb5_free_data(kdc_context, fast_edata);
krb5_free_data(kdc_context, e_data_asn1);
free(scratch);
free(e_data);
if (cookie != NULL)
free(cookie->contents);
free(cookie);
return retval;
}