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|
/*
* appl/telnet/libtelnet/kerberos5.c
*/
/*-
* Copyright (c) 1991, 1993
* The Regents of the University of California. 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 the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
*/
/* based on @(#)kerberos5.c 8.1 (Berkeley) 6/4/93 */
/*
* Copyright (C) 1990 by the Massachusetts Institute of Technology
*
* 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. 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.
*/
#ifdef KRB5
#include <arpa/telnet.h>
#include <stdio.h>
#include "k5-int.h"
#include "com_err.h"
#include <netdb.h>
#include <ctype.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#else
extern char *malloc();
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#else
#include <strings.h>
#endif
#include "encrypt.h"
#include "auth.h"
#include "misc.h"
extern auth_debug_mode;
extern int net;
#ifdef FORWARD
int forward_flags = 0; /* Flags get set in telnet/main.c on -f and -F */
/* These values need to be the same as those defined in telnet/main.c. */
/* Either define them in both places, or put in some common header file. */
#define OPTS_FORWARD_CREDS 0x00000002
#define OPTS_FORWARDABLE_CREDS 0x00000001
void kerberos5_forward();
#endif /* FORWARD */
static unsigned char str_data[1024] = { IAC, SB, TELOPT_AUTHENTICATION, 0,
AUTHTYPE_KERBEROS_V5, };
/*static unsigned char str_name[1024] = { IAC, SB, TELOPT_AUTHENTICATION,
TELQUAL_NAME, };*/
#define KRB_AUTH 0 /* Authentication data follows */
#define KRB_REJECT 1 /* Rejected (reason might follow) */
#define KRB_ACCEPT 2 /* Accepted */
#define KRB_RESPONSE 3 /* Response for mutual auth. */
#ifdef FORWARD
#define KRB_FORWARD 4 /* Forwarded credentials follow */
#define KRB_FORWARD_ACCEPT 5 /* Forwarded credentials accepted */
#define KRB_FORWARD_REJECT 6 /* Forwarded credentials rejected */
#endif /* FORWARD */
krb5_auth_context auth_context;
static krb5_data auth;
/* telnetd gets session key from here */
static krb5_ticket * ticket = NULL;
/* telnet matches the AP_REQ and AP_REP with this */
/* some compilers can't hack void *, so we use the Kerberos krb5_pointer,
which is either void * or char *, depending on the compiler. */
#define Voidptr krb5_pointer
krb5_keyblock *session_key = 0;
char * telnet_srvtab = NULL;
char * telnet_krb5_realm = NULL;
static int
Data(ap, type, d, c)
Authenticator *ap;
int type;
Voidptr d;
int c;
{
unsigned char *p = str_data + 4;
unsigned char *cd = (unsigned char *)d;
if (c == -1)
c = strlen((char *)cd);
if (auth_debug_mode) {
printf("%s:%d: [%d] (%d)",
str_data[3] == TELQUAL_IS ? ">>>IS" : ">>>REPLY",
str_data[3],
type, c);
printd(d, c);
printf("\r\n");
}
*p++ = ap->type;
*p++ = ap->way;
*p++ = type;
while (c-- > 0) {
if ((*p++ = *cd++) == IAC)
*p++ = IAC;
}
*p++ = IAC;
*p++ = SE;
if (str_data[3] == TELQUAL_IS)
printsub('>', &str_data[2], p - &str_data[2]);
return(net_write(str_data, p - str_data));
}
krb5_context telnet_context = 0;
int
kerberos5_init(ap, server)
Authenticator *ap;
int server;
{
if (server)
str_data[3] = TELQUAL_REPLY;
else
str_data[3] = TELQUAL_IS;
if (telnet_context == 0)
krb5_init_context(&telnet_context);
krb5_init_ets(telnet_context);
return(1);
}
void
kerberos5_cleanup()
{
krb5_error_code retval;
krb5_ccache ccache;
char *ccname;
if (telnet_context == 0)
return;
ccname = getenv(KRB5_ENV_CCNAME);
if (ccname) {
retval = krb5_cc_resolve(telnet_context, ccname, &ccache);
if (!retval)
retval = krb5_cc_destroy(telnet_context, ccache);
}
krb5_free_context(telnet_context);
telnet_context = 0;
}
int
kerberos5_send(ap)
Authenticator *ap;
{
krb5_error_code r;
krb5_ccache ccache;
krb5_creds creds; /* telnet gets session key from here */
krb5_creds * new_creds = 0;
int ap_opts;
char type_check[2];
krb5_data check_data;
#ifdef ENCRYPTION
krb5_keyblock *newkey = 0;
#endif /* ENCRYPTION */
if (!UserNameRequested) {
if (auth_debug_mode) {
printf("Kerberos V5: no user name supplied\r\n");
}
return(0);
}
if ((r = krb5_cc_default(telnet_context, &ccache))) {
if (auth_debug_mode) {
printf("Kerberos V5: could not get default ccache\r\n");
}
return(0);
}
memset((char *)&creds, 0, sizeof(creds));
if ((r = krb5_sname_to_principal(telnet_context, RemoteHostName,
"host", KRB5_NT_SRV_HST,
&creds.server))) {
if (auth_debug_mode)
printf("Kerberos V5: error while constructing service name: %s\r\n", error_message(r));
return(0);
}
if (telnet_krb5_realm != NULL) {
krb5_data rdata;
rdata.length = strlen(telnet_krb5_realm);
rdata.data = (char *) malloc(rdata.length + 1);
if (rdata.data == NULL) {
fprintf(stderr, "malloc failed\n");
return(0);
}
strcpy(rdata.data, telnet_krb5_realm);
krb5_princ_set_realm(telnet_context, creds.server, &rdata);
}
if ((r = krb5_cc_get_principal(telnet_context, ccache,
&creds.client))) {
if (auth_debug_mode) {
printf("Kerberos V5: failure on principal (%s)\r\n",
error_message(r));
}
krb5_free_cred_contents(telnet_context, &creds);
return(0);
}
creds.keyblock.enctype=ENCTYPE_DES_CBC_CRC;
if ((r = krb5_get_credentials(telnet_context, 0,
ccache, &creds, &new_creds))) {
if (auth_debug_mode) {
printf("Kerberos V5: failure on credentials(%s)\r\n",
error_message(r));
}
krb5_free_cred_contents(telnet_context, &creds);
return(0);
}
if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL)
ap_opts = AP_OPTS_MUTUAL_REQUIRED;
else
ap_opts = 0;
#ifdef ENCRYPTION
ap_opts |= AP_OPTS_USE_SUBKEY;
#endif /* ENCRYPTION */
if (auth_context) {
krb5_auth_con_free(telnet_context, auth_context);
auth_context = 0;
}
if ((r = krb5_auth_con_init(telnet_context, &auth_context))) {
if (auth_debug_mode) {
printf("Kerberos V5: failed to init auth_context (%s)\r\n",
error_message(r));
}
return(0);
}
krb5_auth_con_setflags(telnet_context, auth_context,
KRB5_AUTH_CONTEXT_RET_TIME);
type_check[0] = ap->type;
type_check[1] = ap->way;
check_data.magic = KV5M_DATA;
check_data.length = 2;
check_data.data = (char *) &type_check;
r = krb5_mk_req_extended(telnet_context, &auth_context, ap_opts,
&check_data, new_creds, &auth);
#ifdef ENCRYPTION
krb5_auth_con_getlocalsubkey(telnet_context, auth_context, &newkey);
if (session_key) {
krb5_free_keyblock(telnet_context, session_key);
session_key = 0;
}
if (newkey) {
/* keep the key in our private storage, but don't use it
yet---see kerberos5_reply() below */
if ((newkey->enctype != ENCTYPE_DES_CBC_CRC) &&
(newkey-> enctype != ENCTYPE_DES_CBC_MD5)) {
if ((new_creds->keyblock.enctype == ENCTYPE_DES_CBC_CRC) ||
(new_creds->keyblock.enctype == ENCTYPE_DES_CBC_MD5))
/* use the session key in credentials instead */
krb5_copy_keyblock(telnet_context,&new_creds->keyblock,
&session_key);
else
/* XXX ? */;
} else {
krb5_copy_keyblock(telnet_context, newkey, &session_key);
}
krb5_free_keyblock(telnet_context, newkey);
}
#endif /* ENCRYPTION */
krb5_free_cred_contents(telnet_context, &creds);
krb5_free_creds(telnet_context, new_creds);
if (r) {
if (auth_debug_mode) {
printf("Kerberos V5: mk_req failed (%s)\r\n",
error_message(r));
}
return(0);
}
if (!auth_sendname(UserNameRequested, strlen(UserNameRequested))) {
if (auth_debug_mode)
printf("Not enough room for user name\r\n");
return(0);
}
if (!Data(ap, KRB_AUTH, auth.data, auth.length)) {
if (auth_debug_mode)
printf("Not enough room for authentication data\r\n");
return(0);
}
if (auth_debug_mode) {
printf("Sent Kerberos V5 credentials to server\r\n");
}
return(1);
}
void
kerberos5_is(ap, data, cnt)
Authenticator *ap;
unsigned char *data;
int cnt;
{
int r;
krb5_principal server;
krb5_keyblock *newkey = NULL;
krb5_data outbuf;
#ifdef ENCRYPTION
Session_Key skey;
#endif
char errbuf[128];
char *name;
char *getenv();
krb5_data inbuf;
krb5_authenticator *authenticator;
if (cnt-- < 1)
return;
switch (*data++) {
case KRB_AUTH:
auth.data = (char *)data;
auth.length = cnt;
r = krb5_sname_to_principal(telnet_context, 0, "host",
KRB5_NT_SRV_HST,
&server);
if (!r) {
krb5_rcache rcache;
krb5_keytab keytabid = NULL;
r = krb5_get_server_rcache(telnet_context,
krb5_princ_component(telnet_context,
server, 0),
&rcache);
if (!r)
if (telnet_srvtab)
r = krb5_kt_resolve(telnet_context,
telnet_srvtab, &keytabid);
if (!r)
r = krb5_rd_req(telnet_context, &auth_context, &auth,
server, keytabid, NULL, &ticket);
if (rcache)
krb5_rc_close(telnet_context, rcache);
krb5_free_principal(telnet_context, server);
}
if (r) {
(void) strcpy(errbuf, "krb5_rd_req failed: ");
(void) strcat(errbuf, error_message(r));
goto errout;
}
r = krb5_auth_con_getauthenticator(telnet_context,
auth_context,
&authenticator);
if (r) {
(void) strcpy(errbuf,
"krb5_auth_con_getauthenticator failed: ");
(void) strcat(errbuf, error_message(r));
goto errout;
}
if ((ap->way & AUTH_ENCRYPT_MASK) == AUTH_ENCRYPT_ON &&
!authenticator->checksum) {
(void) strcpy(errbuf,
"authenticator is missing required checksum");
goto errout;
}
if (authenticator->checksum) {
char type_check[2];
krb5_checksum *cksum = authenticator->checksum;
krb5_keyblock *key;
type_check[0] = ap->type;
type_check[1] = ap->way;
r = krb5_auth_con_getkey(telnet_context, auth_context,
&key);
if (r) {
(void) strcpy(errbuf, "krb5_auth_con_getkey failed: ");
(void) strcat(errbuf, error_message(r));
goto errout;
}
r = krb5_verify_checksum(telnet_checksum,
cksum->checksum_type, cksum,
&type_check, 2, key->contents,
key->length);
if (r) {
(void) strcpy(errbuf,
"checksum verification failed: ");
(void) strcat(errbuf, error_message(r));
goto errout;
}
krb5_free_keyblock(telnet_context, key);
}
krb5_free_authenticator(telnet_context, authenticator);
if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
/* do ap_rep stuff here */
if ((r = krb5_mk_rep(telnet_context, auth_context,
&outbuf))) {
(void) strcpy(errbuf, "Make reply failed: ");
(void) strcat(errbuf, error_message(r));
goto errout;
}
Data(ap, KRB_RESPONSE, outbuf.data, outbuf.length);
}
if (krb5_unparse_name(telnet_context,
ticket->enc_part2 ->client,
&name))
name = 0;
Data(ap, KRB_ACCEPT, name, name ? -1 : 0);
if (auth_debug_mode) {
printf("Kerberos5 identifies him as ``%s''\r\n",
name ? name : "");
}
auth_finished(ap, AUTH_USER);
if (name)
free(name);
krb5_auth_con_getremotesubkey(telnet_context, auth_context,
&newkey);
if (session_key) {
krb5_free_keyblock(telnet_context, session_key);
session_key = 0;
}
if (newkey) {
krb5_copy_keyblock(telnet_context, newkey, &session_key);
krb5_free_keyblock(telnet_context, newkey);
} else {
krb5_copy_keyblock(telnet_context,
ticket->enc_part2->session,
&session_key);
}
#ifdef ENCRYPTION
skey.type = SK_DES;
skey.length = 8;
skey.data = session_key->contents;
encrypt_session_key(&skey, 1);
#endif
break;
#ifdef FORWARD
case KRB_FORWARD:
inbuf.length = cnt;
inbuf.data = (char *)data;
if ((r = krb5_auth_con_genaddrs(telnet_context, auth_context,
net, KRB5_AUTH_CONTEXT_GENERATE_REMOTE_FULL_ADDR)) ||
(r = rd_and_store_for_creds(telnet_context, auth_context,
&inbuf, ticket, UserNameRequested))) {
char errbuf[128];
(void) strcpy(errbuf, "Read forwarded creds failed: ");
(void) strcat(errbuf, error_message(r));
Data(ap, KRB_FORWARD_REJECT, errbuf, -1);
if (auth_debug_mode)
printf("Could not read forwarded credentials\r\n");
}
else
Data(ap, KRB_FORWARD_ACCEPT, 0, 0);
if (auth_debug_mode)
printf("Forwarded credentials obtained\r\n");
break;
#endif /* FORWARD */
default:
if (auth_debug_mode)
printf("Unknown Kerberos option %d\r\n", data[-1]);
Data(ap, KRB_REJECT, 0, 0);
break;
}
return;
errout:
Data(ap, KRB_REJECT, errbuf, -1);
if (auth_debug_mode)
printf("%s\r\n", errbuf);
if (auth_context) {
krb5_auth_con_free(telnet_context, auth_context);
auth_context = 0;
}
return;
}
void
kerberos5_reply(ap, data, cnt)
Authenticator *ap;
unsigned char *data;
int cnt;
{
#ifdef ENCRYPTION
Session_Key skey;
#endif
static int mutual_complete = 0;
if (cnt-- < 1)
return;
switch (*data++) {
case KRB_REJECT:
if (cnt > 0) {
printf("[ Kerberos V5 refuses authentication because %.*s ]\r\n",
cnt, data);
} else
printf("[ Kerberos V5 refuses authentication ]\r\n");
auth_send_retry();
return;
case KRB_ACCEPT:
if (!mutual_complete) {
if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
printf("[ Kerberos V5 accepted you, but didn't provide mutual authentication! ]\r\n");
auth_send_retry();
return;
}
#ifdef ENCRYPTION
if (session_key) {
skey.type = SK_DES;
skey.length = 8;
skey.data = session_key->contents;
encrypt_session_key(&skey, 0);
}
#endif /* ENCRYPTION */
}
if (cnt)
printf("[ Kerberos V5 accepts you as ``%.*s'' ]\r\n", cnt, data);
else
printf("[ Kerberos V5 accepts you ]\r\n");
auth_finished(ap, AUTH_USER);
#ifdef FORWARD
if (forward_flags & OPTS_FORWARD_CREDS)
kerberos5_forward(ap);
#endif /* FORWARD */
break;
case KRB_RESPONSE:
if ((ap->way & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) {
/* the rest of the reply should contain a krb_ap_rep */
krb5_ap_rep_enc_part *reply;
krb5_data inbuf;
krb5_error_code r;
inbuf.length = cnt;
inbuf.data = (char *)data;
if ((r = krb5_rd_rep(telnet_context, auth_context, &inbuf,
&reply))) {
printf("[ Mutual authentication failed: %s ]\r\n",
error_message(r));
auth_send_retry();
return;
}
krb5_free_ap_rep_enc_part(telnet_context, reply);
#ifdef ENCRYPTION
if (session_key) {
skey.type = SK_DES;
skey.length = 8;
skey.data = session_key->contents;
encrypt_session_key(&skey, 0);
}
#endif /* ENCRYPTION */
mutual_complete = 1;
}
return;
#ifdef FORWARD
case KRB_FORWARD_ACCEPT:
printf("[ Kerberos V5 accepted forwarded credentials ]\r\n");
return;
case KRB_FORWARD_REJECT:
printf("[ Kerberos V5 refuses forwarded credentials because %.*s ]\r\n",
cnt, data);
return;
#endif /* FORWARD */
default:
if (auth_debug_mode)
printf("Unknown Kerberos option %d\r\n", data[-1]);
return;
}
return;
}
int
kerberos5_status(ap, name, level)
Authenticator *ap;
char *name;
int level;
{
if (level < AUTH_USER)
return(level);
if (UserNameRequested &&
krb5_kuserok(telnet_context, ticket->enc_part2->client,
UserNameRequested))
{
strcpy(name, UserNameRequested);
return(AUTH_VALID);
} else
return(AUTH_USER);
}
#define BUMP(buf, len) while (*(buf)) {++(buf), --(len);}
#define ADDC(buf, len, c) if ((len) > 0) {*(buf)++ = (c); --(len);}
void
kerberos5_printsub(data, cnt, buf, buflen)
unsigned char *data, *buf;
int cnt, buflen;
{
char lbuf[32];
register int i;
buf[buflen-1] = '\0'; /* make sure its NULL terminated */
buflen -= 1;
switch(data[3]) {
case KRB_REJECT: /* Rejected (reason might follow) */
strncpy((char *)buf, " REJECT ", buflen);
goto common;
case KRB_ACCEPT: /* Accepted (name might follow) */
strncpy((char *)buf, " ACCEPT ", buflen);
common:
BUMP(buf, buflen);
if (cnt <= 4)
break;
ADDC(buf, buflen, '"');
for (i = 4; i < cnt; i++)
ADDC(buf, buflen, data[i]);
ADDC(buf, buflen, '"');
ADDC(buf, buflen, '\0');
break;
case KRB_AUTH: /* Authentication data follows */
strncpy((char *)buf, " AUTH", buflen);
goto common2;
case KRB_RESPONSE:
strncpy((char *)buf, " RESPONSE", buflen);
goto common2;
#ifdef FORWARD
case KRB_FORWARD: /* Forwarded credentials follow */
strncpy((char *)buf, " FORWARD", buflen);
goto common2;
case KRB_FORWARD_ACCEPT: /* Forwarded credentials accepted */
strncpy((char *)buf, " FORWARD_ACCEPT", buflen);
goto common2;
case KRB_FORWARD_REJECT: /* Forwarded credentials rejected */
/* (reason might follow) */
strncpy((char *)buf, " FORWARD_REJECT", buflen);
goto common2;
#endif /* FORWARD */
default:
sprintf(lbuf, " %d (unknown)", data[3]);
strncpy((char *)buf, lbuf, buflen);
common2:
BUMP(buf, buflen);
for (i = 4; i < cnt; i++) {
sprintf(lbuf, " %d", data[i]);
strncpy((char *)buf, lbuf, buflen);
BUMP(buf, buflen);
}
break;
}
}
#ifdef FORWARD
void
kerberos5_forward(ap)
Authenticator *ap;
{
krb5_error_code r;
krb5_ccache ccache;
krb5_principal client = 0;
krb5_principal server = 0;
krb5_data forw_creds;
forw_creds.data = 0;
if ((r = krb5_cc_default(telnet_context, &ccache))) {
if (auth_debug_mode)
printf("Kerberos V5: could not get default ccache - %s\r\n",
error_message(r));
return;
}
if ((r = krb5_cc_get_principal(telnet_context, ccache, &client))) {
if (auth_debug_mode)
printf("Kerberos V5: could not get default principal - %s\r\n",
error_message(r));
goto cleanup;
}
if ((r = krb5_sname_to_principal(telnet_context, RemoteHostName, "host",
KRB5_NT_SRV_HST, &server))) {
if (auth_debug_mode)
printf("Kerberos V5: could not make server principal - %s\r\n",
error_message(r));
goto cleanup;
}
if ((r = krb5_auth_con_genaddrs(telnet_context, auth_context, net,
KRB5_AUTH_CONTEXT_GENERATE_LOCAL_FULL_ADDR))) {
if (auth_debug_mode)
printf("Kerberos V5: could not gen local full address - %s\r\n",
error_message(r));
goto cleanup;
}
if ((r = krb5_fwd_tgt_creds(telnet_context, auth_context, 0, client,
server, ccache,
forward_flags & OPTS_FORWARDABLE_CREDS,
&forw_creds))) {
if (auth_debug_mode)
printf("Kerberos V5: error getting forwarded creds - %s\r\n",
error_message(r));
goto cleanup;
}
/* Send forwarded credentials */
if (!Data(ap, KRB_FORWARD, forw_creds.data, forw_creds.length)) {
if (auth_debug_mode)
printf("Not enough room for authentication data\r\n");
} else {
if (auth_debug_mode)
printf("Forwarded local Kerberos V5 credentials to server\r\n");
}
cleanup:
if (client)
krb5_free_principal(telnet_context, client);
if (server)
krb5_free_principal(telnet_context, server);
if (forw_creds.data)
free(forw_creds.data);
krb5_cc_close(telnet_context, ccache);
}
#endif /* FORWARD */
#endif /* KRB5 */
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