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46fb4c6f024aaf85ffe9b441c593d26b8ed050dc
heimdal/lib/krb5/get_cred.c
Johan Danielsson 46fb4c6f02 Implement krb5_get_cred_from_kdc. 
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@3897 ec53bebd-3082-4978-b11e-865c3cabbd6b
1997-11-11 00:58:16 +00:00

598 lines
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/*
* Copyright (c) 1997 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Kungliga Tekniska
* Högskolan and its contributors.
*
* 4. 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 <krb5_locl.h>
RCSID("$Id$");
static krb5_error_code
make_pa_tgs_req(krb5_context context,
KDC_REQ_BODY *body,
PA_DATA *padata,
krb5_keyblock **subkey,
krb5_creds *creds)
{
unsigned char buf[1024];
size_t len;
krb5_data in_data;
krb5_error_code ret;
encode_KDC_REQ_BODY(buf + sizeof(buf) - 1, sizeof(buf),
body, &len);
in_data.length = len;
in_data.data = buf + sizeof(buf) - len;
{
Ticket ticket;
krb5_auth_context ac;
ret = krb5_auth_con_init(context, &ac);
if(ret)
return ret;
ret = decode_Ticket(creds->ticket.data, creds->ticket.length,
&ticket, &len);
if(ret){
krb5_auth_con_free(context, ac);
return ret;
}
if(ticket.enc_part.etype == ETYPE_DES_CBC_CRC){
krb5_auth_setcksumtype(context, ac, CKSUMTYPE_RSA_MD4);
krb5_auth_setenctype(context, ac, ETYPE_DES_CBC_CRC);
}
free_Ticket(&ticket);
ret = krb5_mk_req_extended(context, &ac, 0, &in_data, creds,
&padata->padata_value);
if(ret == 0)
ret = krb5_auth_con_getlocalsubkey(context, ac, subkey);
krb5_auth_con_free(context, ac);
}
if(ret)
return ret;
padata->padata_type = pa_tgs_req;
return 0;
}
static krb5_error_code
init_tgs_req (krb5_context context,
krb5_ccache ccache,
krb5_addresses *addresses,
krb5_kdc_flags flags,
Ticket *second_ticket,
krb5_creds *in_creds,
krb5_creds *krbtgt,
unsigned nonce,
krb5_keyblock **subkey,
TGS_REQ *t)
{
krb5_error_code ret;
memset(t, 0, sizeof(*t));
t->pvno = 5;
t->msg_type = krb_tgs_req;
ret = krb5_init_etype(context,
&t->req_body.etype.len,
&t->req_body.etype.val,
NULL);
if (ret)
goto fail;
t->req_body.addresses = addresses;
t->req_body.kdc_options = flags.b;
ret = copy_Realm(&in_creds->server->realm, &t->req_body.realm);
if (ret)
goto fail;
t->req_body.sname = malloc(sizeof(*t->req_body.sname));
if (t->req_body.sname == NULL) {
ret = ENOMEM;
goto fail;
}
ret = copy_PrincipalName(&in_creds->server->name, t->req_body.sname);
if (ret)
goto fail;
if(in_creds->times.endtime){
ALLOC(t->req_body.till, 1);
*t->req_body.till = in_creds->times.endtime;
} else {
/* this is necessary with old MIT code (such as DCE secd) */
ALLOC(t->req_body.till, 1);
*t->req_body.till = 0;
}
t->req_body.nonce = nonce;
if(second_ticket){
ALLOC(t->req_body.additional_tickets, 1);
if (t->req_body.additional_tickets == NULL) {
ret = ENOMEM;
goto fail;
}
t->req_body.additional_tickets->len = 1;
ALLOC(t->req_body.additional_tickets->val, 1);
if (t->req_body.additional_tickets->val == NULL) {
ret = ENOMEM;
goto fail;
}
ret = copy_Ticket(second_ticket, t->req_body.additional_tickets->val);
if (ret)
goto fail;
}
t->req_body.enc_authorization_data = NULL;
t->padata = malloc(sizeof(*t->padata));
if (t->padata == NULL) {
ret = ENOMEM;
goto fail;
}
t->padata->len = 1;
t->padata->val = malloc(sizeof(*t->padata->val));
if (t->padata->val == NULL) {
ret = ENOMEM;
goto fail;
}
ret = make_pa_tgs_req(context,
&t->req_body,
t->padata->val,
subkey,
krbtgt);
if(ret)
goto fail;
return 0;
fail:
free_TGS_REQ (t);
return ret;
}
static krb5_error_code
get_krbtgt(krb5_context context,
krb5_ccache id,
krb5_realm realm,
krb5_creds **cred)
{
krb5_error_code ret;
krb5_creds tmp_cred;
memset(&tmp_cred, 0, sizeof(tmp_cred));
ret = krb5_make_principal(context,
&tmp_cred.server,
realm,
"krbtgt",
realm,
NULL);
if(ret)
return ret;
ret = krb5_get_credentials(context,
KRB5_GC_CACHED,
id,
&tmp_cred,
cred);
krb5_free_principal(context, tmp_cred.server);
if(ret)
return ret;
return 0;
}
/* DCE compatible decrypt proc */
static krb5_error_code
decrypt_tkt_with_subkey (krb5_context context,
const krb5_keyblock *key,
krb5_const_pointer subkey,
krb5_kdc_rep *dec_rep)
{
krb5_error_code ret;
krb5_data data;
size_t size;
krb5_data save;
ret = krb5_data_copy(&save, dec_rep->part1.enc_part.cipher.data,
dec_rep->part1.enc_part.cipher.length);
if(ret)
return ret;
ret = krb5_decrypt (context,
dec_rep->part1.enc_part.cipher.data,
dec_rep->part1.enc_part.cipher.length,
dec_rep->part1.enc_part.etype,
key,
&data);
if(ret && subkey){
ret = krb5_decrypt (context, save.data, save.length,
dec_rep->part1.enc_part.etype,
(krb5_keyblock*)subkey, /* local subkey */
&data);
}
krb5_data_free(&save);
if (ret)
return ret;
ret = decode_EncASRepPart(data.data,
data.length,
&dec_rep->part2,
&size);
if (ret)
ret = decode_EncTGSRepPart(data.data,
data.length,
&dec_rep->part2,
&size);
krb5_data_free (&data);
if (ret) return ret;
return 0;
}
static krb5_error_code
get_cred_kdc(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
krb5_addresses *addresses,
krb5_creds *in_creds, krb5_creds *krbtgt,
krb5_creds **out_creds)
{
TGS_REQ req;
krb5_data enc;
krb5_data resp;
krb5_kdc_rep rep;
KRB_ERROR error;
krb5_error_code ret;
unsigned nonce;
unsigned char buf[1024];
krb5_keyblock *subkey = NULL;
size_t len;
Ticket second_ticket;
krb5_generate_random_block(&nonce, sizeof(nonce));
nonce &= 0xffffffff;
if(flags.b.enc_tkt_in_skey){
ret = decode_Ticket(in_creds->second_ticket.data,
in_creds->second_ticket.length,
&second_ticket, &len);
if(ret)
return ret;
}
ret = init_tgs_req (context,
id,
addresses,
flags,
flags.b.enc_tkt_in_skey ? &second_ticket : NULL,
in_creds,
krbtgt,
nonce,
&subkey,
&req);
if(flags.b.enc_tkt_in_skey)
free_Ticket(&second_ticket);
if (ret)
goto out;
ret = encode_TGS_REQ (buf + sizeof (buf) - 1, sizeof(buf),
&req, &enc.length);
/* don't free addresses */
req.req_body.addresses = NULL;
free_TGS_REQ(&req);
enc.data = buf + sizeof(buf) - enc.length;
if (ret)
goto out;
/*
* Send and receive
*/
ret = krb5_sendto_kdc (context, &enc,
&krbtgt->server->name.name_string.val[1], &resp);
if(ret)
goto out;
memset(&rep, 0, sizeof(rep));
if(decode_TGS_REP(resp.data, resp.length, &rep.part1, &len) == 0){
ret = krb5_copy_principal(context,
in_creds->client,
&(*out_creds)->client);
if(ret)
goto out;
ret = krb5_copy_principal(context,
in_creds->server,
&(*out_creds)->server);
if(ret)
goto out;
/* this should go someplace else */
(*out_creds)->times.endtime = in_creds->times.endtime;
ret = _krb5_extract_ticket(context,
&rep,
*out_creds,
&krbtgt->session,
NULL,
&krbtgt->addresses,
nonce,
TRUE,
decrypt_tkt_with_subkey,
subkey);
krb5_free_kdc_rep(context, &rep);
if (ret)
goto out;
}else if(krb5_rd_error(context, &resp, &error) == 0){
ret = error.error_code;
free_KRB_ERROR(&error);
}else if(resp.data && ((char*)resp.data)[0] == 4)
ret = KRB5KRB_AP_ERR_V4_REPLY;
else
ret = KRB5KRB_AP_ERR_MSG_TYPE;
krb5_data_free(&resp);
out:
if(subkey){
krb5_free_keyblock(context, subkey);
free(subkey);
}
return ret;
}
/* same as above, just get local addresses first */
static krb5_error_code
get_cred_kdc_la(krb5_context context, krb5_ccache id, krb5_kdc_flags flags,
krb5_creds *in_creds, krb5_creds *krbtgt,
krb5_creds **out_creds)
{
krb5_error_code ret;
krb5_addresses addresses;
krb5_get_all_client_addrs(&addresses);
ret = get_cred_kdc(context, id, flags, &addresses,
in_creds, krbtgt, out_creds);
krb5_free_addresses(context, &addresses);
return ret;
}
krb5_error_code
krb5_get_kdc_cred(krb5_context context,
krb5_ccache id,
krb5_kdc_flags flags,
krb5_addresses *addresses,
Ticket *second_ticket,
krb5_creds *in_creds,
krb5_creds **out_creds
)
{
krb5_error_code ret;
krb5_creds *krbtgt;
ret = get_krbtgt (context,
id,
in_creds->server->realm,
&krbtgt);
ret = get_cred_kdc(context, id, flags, addresses,
in_creds, krbtgt, out_creds);
krb5_free_creds (context, krbtgt);
return ret;
}
static krb5_error_code
find_cred(krb5_context context,
krb5_ccache id,
krb5_principal server,
krb5_creds **tgts,
krb5_creds *out_creds)
{
krb5_error_code ret;
krb5_creds mcreds;
mcreds.server = server;
ret = krb5_cc_retrieve_cred(context, id, KRB5_TC_DONT_MATCH_REALM,
&mcreds, out_creds);
if(ret == 0)
return 0;
while(*tgts){
if(krb5_compare_creds(context, KRB5_TC_DONT_MATCH_REALM,
&mcreds, *tgts)){
ret = krb5_copy_creds_contents(context, *tgts, out_creds);
return ret;
}
tgts++;
}
return KRB5_CC_NOTFOUND;
}
static krb5_error_code
add_cred(krb5_context context, krb5_creds ***tgts, krb5_creds *tkt)
{
int i;
krb5_error_code ret;
krb5_creds **tmp = *tgts;
for(i = 0; tmp && tmp[i]; i++); /* XXX */
tmp = realloc(tmp, (i+2)*sizeof(*tmp));
if(tmp == NULL)
return ENOMEM;
*tgts = tmp;
ret = krb5_copy_creds(context, tkt, &tmp[i]);
return ret;
}
/*
get_cred(server)
creds = cc_get_cred(server)
if(creds) return creds
tgt = cc_get_cred(krbtgt/server_realm@any_realm)
if(tgt)
return get_cred_tgt(server, tgt)
if(client_realm == server_realm)
return NULL
tgt = get_cred(krbtgt/server_realm@client_realm)
while(tgt_inst != server_realm)
tgt = get_cred(krbtgt/server_realm@tgt_inst)
return get_cred_tgt(server, tgt)
*/
static krb5_error_code
get_cred_from_kdc_flags(krb5_context context,
krb5_kdc_flags flags,
krb5_ccache ccache,
krb5_creds *in_creds,
krb5_creds **out_creds,
krb5_creds ***ret_tgts)
{
krb5_error_code ret;
krb5_creds *tgt, tmp_creds;
krb5_realm client_realm, server_realm;
*out_creds = calloc(1, sizeof(**out_creds));
client_realm = *krb5_princ_realm(context, in_creds->client);
server_realm = *krb5_princ_realm(context, in_creds->server);
memset(&tmp_creds, 0, sizeof(tmp_creds));
ret = krb5_copy_principal(context, in_creds->client, &tmp_creds.client);
if(ret)
return ret;
ret = krb5_make_principal(context,
&tmp_creds.server,
client_realm,
"krbtgt",
server_realm,
NULL);
if(ret){
krb5_free_principal(context, tmp_creds.client);
return ret;
}
{
krb5_creds tgts;
/* XXX try krb5_cc_retrieve_cred first? */
ret = find_cred(context, ccache, tmp_creds.server,
*ret_tgts, &tgts);
if(ret == 0){
ret = get_cred_kdc_la(context, ccache, flags,
in_creds, &tgts, out_creds);
krb5_free_creds_contents(context, &tgts);
krb5_free_principal(context, tmp_creds.server);
krb5_free_principal(context, tmp_creds.client);
return ret;
}
}
if(krb5_realm_compare(context, in_creds->client, in_creds->server))
return -1; /* XXX */
/* XXX this can loop forever */
while(1){
general_string tgt_inst;
krb5_kdc_flags f;
f.i = 0;
ret = get_cred_from_kdc_flags(context, flags, ccache, &tmp_creds,
&tgt, ret_tgts);
if(ret) return ret;
ret = add_cred(context, ret_tgts, tgt);
if(ret)
return ret;
tgt_inst = tgt->server->name.name_string.val[1];
if(strcmp(tgt_inst, server_realm) == 0)
break;
krb5_free_principal(context, tmp_creds.server);
ret = krb5_make_principal(context, &tmp_creds.server,
tgt_inst, "krbtgt", server_realm, NULL);
if(ret) return ret;
ret = krb5_free_creds(context, tgt);
if(ret) return ret;
}
krb5_free_principal(context, tmp_creds.server);
krb5_free_principal(context, tmp_creds.client);
ret = get_cred_kdc_la(context, ccache, flags, in_creds, tgt, out_creds);
krb5_free_creds(context, tgt);
return ret;
}
krb5_error_code
krb5_get_cred_from_kdc(krb5_context context,
krb5_ccache ccache,
krb5_creds *in_creds,
krb5_creds **out_creds,
krb5_creds ***ret_tgts)
{
krb5_kdc_flags f;
f.i = 0;
return get_cred_from_kdc_flags(context, f, ccache,
in_creds, out_creds, ret_tgts);
}
krb5_error_code
krb5_get_credentials_with_flags(krb5_context context,
krb5_flags options,
krb5_kdc_flags flags,
krb5_ccache ccache,
krb5_creds *in_creds,
krb5_creds **out_creds)
{
krb5_error_code ret;
krb5_creds *tgt, **tgts;
int i;
*out_creds = calloc(1, sizeof(**out_creds));
ret = krb5_cc_retrieve_cred(context, ccache, 0, in_creds, *out_creds);
if(ret == 0)
return 0;
free(*out_creds);
if(ret != KRB5_CC_END)
return ret;
if(options & KRB5_GC_CACHED)
return KRB5_CC_NOTFOUND;
if(options & KRB5_GC_USER_USER)
flags.b.enc_tkt_in_skey = 1;
tgts = NULL;
ret = get_cred_from_kdc_flags(context, flags, ccache,
in_creds, out_creds, &tgts);
for(i = 0; tgts && tgts[i]; i++){
krb5_cc_store_cred(context, ccache, tgts[i]);
krb5_free_creds(context, tgts[i]);
}
free(tgts);
if(ret == 0)
krb5_cc_store_cred(context, ccache, *out_creds);
return ret;
}
krb5_error_code
krb5_get_credentials(krb5_context context,
krb5_flags options,
krb5_ccache ccache,
krb5_creds *in_creds,
krb5_creds **out_creds)
{
krb5_kdc_flags flags;
flags.i = 0;
return krb5_get_credentials_with_flags(context, options, flags,
ccache, in_creds, out_creds);
}
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