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Use the new Kerberos 4 functions in libkrb5 and so kerberos 4 is

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always compiled in (still default disabled)


git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@14900 ec53bebd-3082-4978-b11e-865c3cabbd6b
This commit is contained in:
Love Hörnquist Åstrand
2005-04-23 19:57:56 +00:00
parent e54c17af6b
commit 2eb8ce2e5f
3 changed files with 220 additions and 126 deletions
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316
kdc/kerberos4.c
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@@ -33,9 +33,9 @@
#include "kdc_locl.h"
RCSID("$Id$");
#include <krb5-v4compat.h>
#ifdef KRB4
RCSID("$Id$");
#ifndef swap32
static u_int32_t
@@ -55,18 +55,11 @@ maybe_version4(unsigned char *buf, int len)
}
static void
make_err_reply(krb5_data *reply, int code, const char *msg)
make_err_reply(krb5_context context, krb5_data *reply,
int code, const char *msg)
{
KTEXT_ST er;
/* name, instance and realm are not checked in most (all?)
implementations; msg is also never used, but we send it anyway
(for debugging purposes) */
if(msg == NULL)
msg = krb_get_err_text(code);
cr_err_reply(&er, "", "", "", kdc_time, code, (char*)msg);
krb5_data_copy(reply, er.dat, er.length);
_krb5_krb_cr_err_reply(context, "", "", "",
kdc_time, code, msg, reply);
}
static krb5_boolean
@@ -108,7 +101,7 @@ db_fetch4(const char *name, const char *instance, const char *realm,
return ret;
}
#define RCHECK(X, L) if(X){make_err_reply(reply, KFAILURE, "Packet too short"); goto L;}
#define RCHECK(X, L) if(X){make_err_reply(context, reply, KFAILURE, "Packet too short"); goto L;}
/*
* Process the v4 request in `buf, len' (received from `addr'
@@ -133,14 +126,14 @@ do_version4(unsigned char *buf,
char *name = NULL, *inst = NULL, *realm = NULL;
char *sname = NULL, *sinst = NULL;
int32_t req_time;
time_t max_life, max_end, actual_end, issue_time;
time_t max_life;
u_int8_t life;
char client_name[256];
char server_name[256];
if(!enable_v4) {
kdc_log(0, "Rejected version 4 request from %s", from);
make_err_reply(reply, KDC_GEN_ERR, "function not enabled");
make_err_reply(context, reply, KDC_GEN_ERR, "function not enabled");
return 0;
}
@@ -148,14 +141,20 @@ do_version4(unsigned char *buf,
RCHECK(krb5_ret_int8(sp, &pvno), out);
if(pvno != 4){
kdc_log(0, "Protocol version mismatch (krb4) (%d)", pvno);
make_err_reply(reply, KDC_PKT_VER, NULL);
make_err_reply(context, reply, KDC_PKT_VER, "protocol mismatch");
goto out;
}
RCHECK(krb5_ret_int8(sp, &msg_type), out);
lsb = msg_type & 1;
msg_type &= ~1;
switch(msg_type){
case AUTH_MSG_KDC_REQUEST:
case AUTH_MSG_KDC_REQUEST: {
krb5_data ticket, cipher;
krb5_keyblock session;
krb5_data_zero(&ticket);
krb5_data_zero(&cipher);
RCHECK(krb5_ret_stringz(sp, &name), out1);
RCHECK(krb5_ret_stringz(sp, &inst), out1);
RCHECK(krb5_ret_stringz(sp, &realm), out1);
@@ -177,14 +176,16 @@ do_version4(unsigned char *buf,
if(ret) {
kdc_log(0, "Client not found in database: %s: %s",
client_name, krb5_get_err_text(context, ret));
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, NULL);
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN,
"principal unknown");
goto out1;
}
ret = db_fetch4(sname, sinst, v4_realm, &server);
if(ret){
kdc_log(0, "Server not found in database: %s: %s",
server_name, krb5_get_err_text(context, ret));
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, NULL);
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN,
"principal unknown");
goto out1;
}
@@ -193,7 +194,8 @@ do_version4(unsigned char *buf,
TRUE);
if (ret) {
/* good error code? */
make_err_reply(reply, KERB_ERR_NAME_EXP, NULL);
make_err_reply(context, reply, KERB_ERR_NAME_EXP,
"operation not allowed");
goto out1;
}
@@ -209,14 +211,15 @@ do_version4(unsigned char *buf,
"Pre-authentication required for v4-request: "
"%s for %s",
client_name, server_name);
make_err_reply(reply, KERB_ERR_NULL_KEY, NULL);
make_err_reply(context, reply, KERB_ERR_NULL_KEY,
"preauth required");
goto out1;
}
ret = get_des_key(client, FALSE, FALSE, &ckey);
if(ret){
kdc_log(0, "no suitable DES key for client");
make_err_reply(reply, KDC_NULL_KEY,
make_err_reply(context, reply, KDC_NULL_KEY,
"no suitable DES key for client");
goto out1;
}
@@ -229,7 +232,7 @@ do_version4(unsigned char *buf,
if(ret){
kdc_log(0, "No version-4 salted key in database -- %s.%s@%s",
name, inst, realm);
make_err_reply(reply, KDC_NULL_KEY,
make_err_reply(context, reply, KDC_NULL_KEY,
"No version-4 salted key in database");
goto out1;
}
@@ -239,12 +242,12 @@ do_version4(unsigned char *buf,
if(ret){
kdc_log(0, "no suitable DES key for server");
/* XXX */
make_err_reply(reply, KDC_NULL_KEY,
make_err_reply(context, reply, KDC_NULL_KEY,
"no suitable DES key for server");
goto out1;
}
max_life = krb_life_to_time(0, life);
max_life = _krb5_krb_life_to_time(0, life);
if(client->max_life)
max_life = min(max_life, *client->max_life);
if(server->max_life)
@@ -252,41 +255,85 @@ do_version4(unsigned char *buf,
life = krb_time_to_life(kdc_time, kdc_time + max_life);
{
KTEXT_ST cipher, ticket;
KTEXT r;
des_cblock session;
des_new_random_key(&session);
krb_create_ticket(&ticket, 0, name, inst, v4_realm,
addr->sin_addr.s_addr, session, life, kdc_time,
sname, sinst, skey->key.keyvalue.data);
create_ciph(&cipher, session, sname, sinst, v4_realm,
life, server->kvno % 256, &ticket, kdc_time,
ckey->key.keyvalue.data);
memset(&session, 0, sizeof(session));
r = create_auth_reply(name, inst, realm, req_time, 0,
client->pw_end ? *client->pw_end : 0,
client->kvno % 256, &cipher);
krb5_data_copy(reply, r->dat, r->length);
memset(&cipher, 0, sizeof(cipher));
memset(&ticket, 0, sizeof(ticket));
ret = krb5_generate_random_keyblock(context,
ETYPE_DES_PCBC_NONE,
&session);
if (ret) {
make_err_reply(context, reply, KFAILURE,
"Not enough random i KDC");
goto out1;
}
ret = _krb5_krb_create_ticket(context,
0,
name,
inst,
v4_realm,
addr->sin_addr.s_addr,
&session,
life,
kdc_time,
sname,
sinst,
&skey->key,
&ticket);
if (ret) {
krb5_free_keyblock_contents(context, &session);
make_err_reply(context, reply, KFAILURE,
"failed to create v4 ticket");
goto out1;
}
ret = _krb5_krb_create_ciph(context,
&session,
sname,
sinst,
v4_realm,
life,
server->kvno % 255,
&ticket,
kdc_time,
&ckey->key,
&cipher);
krb5_free_keyblock_contents(context, &session);
krb5_data_free(&ticket);
if (ret) {
make_err_reply(context, reply, KFAILURE,
"Failed to create v4 cipher");
goto out1;
}
ret = _krb5_krb_create_auth_reply(context,
name,
inst,
realm,
req_time,
0,
client->pw_end ? *client->pw_end : 0,
client->kvno % 256,
&cipher,
reply);
krb5_data_free(&cipher);
out1:
break;
}
case AUTH_MSG_APPL_REQUEST: {
_krb5_krb_auth_data ad;
int8_t kvno;
int8_t ticket_len;
int8_t req_len;
KTEXT_ST auth;
AUTH_DAT ad;
krb5_data auth;
int32_t address;
size_t pos;
krb5_principal tgt_princ = NULL;
hdb_entry *tgt = NULL;
Key *tkey;
time_t max_end, actual_end, issue_time;
memset(&ad, 0, sizeof(ad));
krb5_data_zero(&auth);
RCHECK(krb5_ret_int8(sp, &kvno), out2);
RCHECK(krb5_ret_stringz(sp, &realm), out2);
@@ -295,7 +342,7 @@ do_version4(unsigned char *buf,
if(ret){
kdc_log(0, "Converting krbtgt principal (krb4): %s",
krb5_get_err_text(context, ret));
make_err_reply(reply, KFAILURE,
make_err_reply(context, reply, KFAILURE,
"Failed to convert v4 principal (krbtgt)");
goto out2;
}
@@ -307,7 +354,7 @@ do_version4(unsigned char *buf,
"found in database (krb4): krbtgt.%s@%s: %s",
realm, v4_realm,
krb5_get_err_text(context, ret));
make_err_reply(reply, KFAILURE, s);
make_err_reply(context, reply, KFAILURE, s);
free(s);
goto out2;
}
@@ -315,7 +362,7 @@ do_version4(unsigned char *buf,
if(tgt->kvno % 256 != kvno){
kdc_log(0, "tgs-req (krb4) with old kvno %d (current %d) for "
"krbtgt.%s@%s", kvno, tgt->kvno % 256, realm, v4_realm);
make_err_reply(reply, KDC_AUTH_EXP,
make_err_reply(context, reply, KDC_AUTH_EXP,
"old krbtgt kvno used");
goto out2;
}
@@ -324,7 +371,7 @@ do_version4(unsigned char *buf,
if(ret){
kdc_log(0, "no suitable DES key for krbtgt (krb4)");
/* XXX */
make_err_reply(reply, KDC_NULL_KEY,
make_err_reply(context, reply, KDC_NULL_KEY,
"no suitable DES key for krbtgt");
goto out2;
}
@@ -334,18 +381,19 @@ do_version4(unsigned char *buf,
pos = krb5_storage_seek(sp, ticket_len + req_len, SEEK_CUR);
memset(&auth, 0, sizeof(auth));
memcpy(&auth.dat, buf, pos);
auth.data = buf;
auth.length = pos;
krb_set_key(tkey->key.keyvalue.data, 0);
krb_ignore_ip_address = !check_ticket_addresses;
if (check_ticket_addresses)
address = addr->sin_addr.s_addr;
else
address = 0;
ret = krb_rd_req(&auth, "krbtgt", realm,
addr->sin_addr.s_addr, &ad, 0);
ret = _krb5_krb_rd_req(context, &auth, "krbtgt", realm, v4_realm,
address, &tkey->key, &ad);
if(ret){
kdc_log(0, "krb_rd_req: %s", krb_get_err_text(ret));
make_err_reply(reply, ret, NULL);
kdc_log(0, "krb_rd_req: %d", ret);
make_err_reply(context, reply, ret, "failed to parse request");
goto out2;
}
@@ -358,53 +406,58 @@ do_version4(unsigned char *buf,
snprintf (server_name, sizeof(server_name),
"%s.%s@%s",
sname, sinst, v4_realm);
snprintf (client_name, sizeof(client_name),
"%s.%s@%s",
ad.pname, ad.pinst, ad.prealm);
kdc_log(0, "TGS-REQ (krb4) %s.%s@%s from %s for %s",
ad.pname, ad.pinst, ad.prealm, from, server_name);
kdc_log(0, "TGS-REQ (krb4) %s from %s for %s",
client_name, from, server_name);
if(strcmp(ad.prealm, realm)){
kdc_log(0, "Can't hop realms (krb4) %s -> %s", realm, ad.prealm);
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN,
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN,
"Can't hop realms");
goto out2;
}
if (!enable_v4_cross_realm && strcmp(realm, v4_realm) != 0) {
kdc_log(0, "krb4 Cross-realm %s -> %s disabled", realm, v4_realm);
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN,
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN,
"Can't hop realms");
goto out2;
}
if(strcmp(sname, "changepw") == 0){
kdc_log(0, "Bad request for changepw ticket (krb4)");
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN,
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN,
"Can't authorize password change based on TGT");
goto out2;
}
snprintf (client_name, sizeof(client_name),
"%s.%s@%s",
ad.pname, ad.pinst, ad.prealm);
ret = db_fetch4(ad.pname, ad.pinst, ad.prealm, &client);
if(ret != HDB_ERR_NOENTRY ||
(ret == HDB_ERR_NOENTRY && strcmp(ad.prealm, v4_realm) == 0)) {
if(ret && ret != HDB_ERR_NOENTRY) {
char *s;
s = kdc_log_msg(0, "Client not found in database: (krb4) "
"%s.%s@%s: %s",
ad.pname, ad.pinst, ad.prealm,
krb5_get_err_text(context, ret));
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, s);
s = kdc_log_msg(0, "Client not found in database: (krb4) %s: %s",
client_name, krb5_get_err_text(context, ret));
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN, s);
free(s);
goto out2;
}
if (client == NULL && strcmp(ad.prealm, v4_realm) == 0) {
char *s;
s = kdc_log_msg(0, "Local client not found in database: (krb4) "
"%s", client_name);
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN, s);
free(s);
goto out2;
}
ret = db_fetch4(sname, sinst, v4_realm, &server);
if(ret){
char *s;
s = kdc_log_msg(0, "Server not found in database (krb4): %s: %s",
server_name, krb5_get_err_text(context, ret));
make_err_reply(reply, KERB_ERR_PRINCIPAL_UNKNOWN, s);
make_err_reply(context, reply, KERB_ERR_PRINCIPAL_UNKNOWN, s);
free(s);
goto out2;
}
@@ -414,7 +467,8 @@ do_version4(unsigned char *buf,
FALSE);
if (ret) {
/* good error code? */
make_err_reply(reply, KERB_ERR_NAME_EXP, NULL);
make_err_reply(context, reply, KERB_ERR_NAME_EXP,
"operation not allowed");
goto out2;
}
@@ -422,13 +476,13 @@ do_version4(unsigned char *buf,
if(ret){
kdc_log(0, "no suitable DES key for server (krb4)");
/* XXX */
make_err_reply(reply, KDC_NULL_KEY,
make_err_reply(context, reply, KDC_NULL_KEY,
"no suitable DES key for server");
goto out2;
}
max_end = krb_life_to_time(ad.time_sec, ad.life);
max_end = min(max_end, krb_life_to_time(kdc_time, life));
max_end = _krb5_krb_life_to_time(ad.time_sec, ad.life);
max_end = min(max_end, _krb5_krb_life_to_time(kdc_time, life));
if(server->max_life)
max_end = min(max_end, kdc_time + *server->max_life);
if(client && client->max_life)
@@ -436,11 +490,11 @@ do_version4(unsigned char *buf,
life = min(life, krb_time_to_life(kdc_time, max_end));
issue_time = kdc_time;
actual_end = krb_life_to_time(issue_time, life);
actual_end = _krb5_krb_life_to_time(issue_time, life);
while (actual_end > max_end && life > 1) {
/* move them into the next earlier lifetime bracket */
life--;
actual_end = krb_life_to_time(issue_time, life);
actual_end = _krb5_krb_life_to_time(issue_time, life);
}
if (actual_end > max_end) {
/* if life <= 1 and it's still too long, backdate the ticket */
@@ -448,46 +502,88 @@ do_version4(unsigned char *buf,
}
{
KTEXT_ST cipher, ticket;
KTEXT r;
des_cblock session;
des_new_random_key(&session);
krb5_data ticket, cipher;
krb5_keyblock session;
krb_create_ticket(&ticket, 0, ad.pname, ad.pinst, ad.prealm,
addr->sin_addr.s_addr, &session, life,
issue_time,
sname, sinst, skey->key.keyvalue.data);
create_ciph(&cipher, session, sname, sinst, v4_realm,
life, server->kvno % 256, &ticket,
issue_time, &ad.session);
memset(&session, 0, sizeof(session));
memset(ad.session, 0, sizeof(ad.session));
krb5_data_zero(&ticket);
krb5_data_zero(&cipher);
r = create_auth_reply(ad.pname, ad.pinst, ad.prealm,
req_time, 0, 0, 0, &cipher);
krb5_data_copy(reply, r->dat, r->length);
memset(&cipher, 0, sizeof(cipher));
memset(&ticket, 0, sizeof(ticket));
ret = krb5_generate_random_keyblock(context,
ETYPE_DES_PCBC_NONE,
&session);
if (ret) {
make_err_reply(context, reply, KFAILURE,
"Not enough random i KDC");
goto out2;
}
ret = _krb5_krb_create_ticket(context,
0,
ad.pname,
ad.pinst,
ad.prealm,
addr->sin_addr.s_addr,
&session,
life,
issue_time,
sname,
sinst,
&skey->key,
&ticket);
if (ret) {
krb5_free_keyblock_contents(context, &session);
make_err_reply(context, reply, KFAILURE,
"failed to create v4 ticket");
goto out2;
}
ret = _krb5_krb_create_ciph(context,
&session,
sname,
sinst,
v4_realm,
life,
server->kvno % 255,
&ticket,
issue_time,
&ad.session,
&cipher);
krb5_free_keyblock_contents(context, &session);
if (ret) {
make_err_reply(context, reply, KFAILURE,
"failed to create v4 cipher");
goto out2;
}
ret = _krb5_krb_create_auth_reply(context,
ad.pname,
ad.pinst,
ad.prealm,
req_time,
0,
0,
0,
&cipher,
reply);
krb5_data_free(&cipher);
}
out2:
_krb5_krb_free_auth_data(context, &ad);
if(tgt_princ)
krb5_free_principal(context, tgt_princ);
if(tgt)
free_ent(tgt);
break;
}
case AUTH_MSG_ERR_REPLY:
break;
default:
kdc_log(0, "Unknown message type (krb4): %d from %s",
msg_type, from);
make_err_reply(reply, KFAILURE, "Unknown message type");
make_err_reply(context, reply, KFAILURE, "Unknown message type");
}
out:
out:
if(name)
free(name);
if(inst)
@@ -506,12 +602,6 @@ out:
return 0;
}
#else /* KRB4 */
#include <krb5-v4compat.h>
#endif /* KRB4 */
krb5_error_code
encode_v4_ticket(void *buf, size_t len, const EncTicketPart *et,
const PrincipalName *service, size_t *size)