2539acf77b
- Get all functions prototyped or at least defined before use.
- Make code compile (Mostly) clean with -Wall set
- Start to reduce the degree to which DES aka libdes is built in.
- get all functions to the same uniform standard of definition:
int
foo(a, b)
int a;
int *b;
{
:
}
- fix numerous bugs exposed by above processes.
Note - this replaces the previous work which used an unpopular function
definition style.
238 lines
6.5 KiB
C
238 lines
6.5 KiB
C
/*
|
|
* Copyright 1986, 1987, 1988 by the Massachusetts Institute
|
|
* of Technology.
|
|
* For copying and distribution information, please see the file
|
|
* <Copyright.MIT>.
|
|
*
|
|
* from: get_ad_tkt.c,v 4.15 89/07/07 15:18:51 jtkohl Exp $
|
|
* $Id: get_ad_tkt.c,v 1.3 1995/07/18 16:38:25 mark Exp $
|
|
*/
|
|
|
|
#if 0
|
|
#ifndef lint
|
|
static char rcsid[] =
|
|
"$Id: get_ad_tkt.c,v 1.3 1995/07/18 16:38:25 mark Exp $";
|
|
#endif /* lint */
|
|
#endif
|
|
|
|
#include <krb.h>
|
|
#include <des.h>
|
|
#include <prot.h>
|
|
#include <strings.h>
|
|
|
|
#include <stdio.h>
|
|
#include <errno.h>
|
|
|
|
/* use the bsd time.h struct defs for PC too! */
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
|
|
extern int krb_debug;
|
|
|
|
struct timeval tt_local = { 0, 0 };
|
|
|
|
int swap_bytes;
|
|
unsigned long rep_err_code;
|
|
|
|
/*
|
|
* get_ad_tkt obtains a new service ticket from Kerberos, using
|
|
* the ticket-granting ticket which must be in the ticket file.
|
|
* It is typically called by krb_mk_req() when the client side
|
|
* of an application is creating authentication information to be
|
|
* sent to the server side.
|
|
*
|
|
* get_ad_tkt takes four arguments: three pointers to strings which
|
|
* contain the name, instance, and realm of the service for which the
|
|
* ticket is to be obtained; and an integer indicating the desired
|
|
* lifetime of the ticket.
|
|
*
|
|
* It returns an error status if the ticket couldn't be obtained,
|
|
* or AD_OK if all went well. The ticket is stored in the ticket
|
|
* cache.
|
|
*
|
|
* The request sent to the Kerberos ticket-granting service looks
|
|
* like this:
|
|
*
|
|
* pkt->dat
|
|
*
|
|
* TEXT original contents of authenticator+ticket
|
|
* pkt->dat built in krb_mk_req call
|
|
*
|
|
* 4 bytes time_ws always 0 (?)
|
|
* char lifetime lifetime argument passed
|
|
* string service service name argument
|
|
* string sinstance service instance arg.
|
|
*
|
|
* See "prot.h" for the reply packet layout and definitions of the
|
|
* extraction macros like pkt_version(), pkt_msg_type(), etc.
|
|
*/
|
|
|
|
int
|
|
get_ad_tkt(service,sinstance,realm,lifetime)
|
|
char *service;
|
|
char *sinstance;
|
|
char *realm;
|
|
int lifetime;
|
|
{
|
|
static KTEXT_ST pkt_st;
|
|
KTEXT pkt = & pkt_st; /* Packet to KDC */
|
|
static KTEXT_ST rpkt_st;
|
|
KTEXT rpkt = &rpkt_st; /* Returned packet */
|
|
static KTEXT_ST cip_st;
|
|
KTEXT cip = &cip_st; /* Returned Ciphertext */
|
|
static KTEXT_ST tkt_st;
|
|
KTEXT tkt = &tkt_st; /* Current ticket */
|
|
C_Block ses; /* Session key for tkt */
|
|
CREDENTIALS cr;
|
|
int kvno; /* Kvno for session key */
|
|
char lrealm[REALM_SZ];
|
|
C_Block key; /* Key for decrypting cipher */
|
|
Key_schedule key_s;
|
|
long time_ws = 0;
|
|
|
|
char s_name[SNAME_SZ];
|
|
char s_instance[INST_SZ];
|
|
int msg_byte_order;
|
|
int kerror;
|
|
char rlm[REALM_SZ];
|
|
char *ptr;
|
|
|
|
unsigned long kdc_time; /* KDC time */
|
|
|
|
if ((kerror = krb_get_tf_realm(TKT_FILE, lrealm)) != KSUCCESS)
|
|
return(kerror);
|
|
|
|
/* Create skeleton of packet to be sent */
|
|
(void) gettimeofday(&tt_local,(struct timezone *) 0);
|
|
|
|
pkt->length = 0;
|
|
|
|
/*
|
|
* Look for the session key (and other stuff we don't need)
|
|
* in the ticket file for krbtgt.realm@lrealm where "realm"
|
|
* is the service's realm (passed in "realm" argument) and
|
|
* lrealm is the realm of our initial ticket. If we don't
|
|
* have this, we will try to get it.
|
|
*/
|
|
|
|
if ((kerror = krb_get_cred("krbtgt",realm,lrealm,&cr)) != KSUCCESS) {
|
|
/*
|
|
* If realm == lrealm, we have no hope, so let's not even try.
|
|
*/
|
|
if ((strncmp(realm, lrealm, REALM_SZ)) == 0)
|
|
return(AD_NOTGT);
|
|
else{
|
|
if ((kerror =
|
|
get_ad_tkt("krbtgt",realm,lrealm,lifetime)) != KSUCCESS)
|
|
return(kerror);
|
|
if ((kerror = krb_get_cred("krbtgt",realm,lrealm,&cr)) != KSUCCESS)
|
|
return(kerror);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Make up a request packet to the "krbtgt.realm@lrealm".
|
|
* Start by calling krb_mk_req() which puts ticket+authenticator
|
|
* into "pkt". Then tack other stuff on the end.
|
|
*/
|
|
|
|
kerror = krb_mk_req(pkt,"krbtgt",realm,lrealm,0L);
|
|
|
|
if (kerror)
|
|
return(AD_NOTGT);
|
|
|
|
/* timestamp */
|
|
bcopy((char *) &time_ws,(char *) (pkt->dat+pkt->length),4);
|
|
pkt->length += 4;
|
|
*(pkt->dat+(pkt->length)++) = (char) lifetime;
|
|
(void) strcpy((char *) (pkt->dat+pkt->length),service);
|
|
pkt->length += 1 + strlen(service);
|
|
(void) strcpy((char *)(pkt->dat+pkt->length),sinstance);
|
|
pkt->length += 1 + strlen(sinstance);
|
|
|
|
rpkt->length = 0;
|
|
|
|
/* Send the request to the local ticket-granting server */
|
|
if ((kerror = send_to_kdc(pkt, rpkt, realm))) return(kerror);
|
|
|
|
/* check packet version of the returned packet */
|
|
if (pkt_version(rpkt) != KRB_PROT_VERSION )
|
|
return(INTK_PROT);
|
|
|
|
/* Check byte order */
|
|
msg_byte_order = pkt_msg_type(rpkt) & 1;
|
|
swap_bytes = 0;
|
|
if (msg_byte_order != HOST_BYTE_ORDER)
|
|
swap_bytes++;
|
|
|
|
switch (pkt_msg_type(rpkt) & ~1) {
|
|
case AUTH_MSG_KDC_REPLY:
|
|
break;
|
|
case AUTH_MSG_ERR_REPLY:
|
|
bcopy(pkt_err_code(rpkt), (char *) &rep_err_code, 4);
|
|
if (swap_bytes)
|
|
swap_u_long(rep_err_code);
|
|
return(rep_err_code);
|
|
|
|
default:
|
|
return(INTK_PROT);
|
|
}
|
|
|
|
/* Extract the ciphertext */
|
|
cip->length = pkt_clen(rpkt); /* let clen do the swap */
|
|
|
|
bcopy((char *) pkt_cipher(rpkt),(char *) (cip->dat),cip->length);
|
|
|
|
#ifndef NOENCRYPTION
|
|
key_sched((C_Block *)cr.session,key_s);
|
|
pcbc_encrypt((C_Block *)cip->dat,(C_Block *)cip->dat,(long)cip->length,
|
|
key_s,(C_Block *)cr.session,DECRYPT);
|
|
#endif
|
|
/* Get rid of all traces of key */
|
|
bzero((char *) cr.session, sizeof(key));
|
|
bzero((char *) key_s, sizeof(key_s));
|
|
|
|
ptr = (char *) cip->dat;
|
|
|
|
bcopy(ptr,(char *)ses,8);
|
|
ptr += 8;
|
|
|
|
(void) strcpy(s_name,ptr);
|
|
ptr += strlen(s_name) + 1;
|
|
|
|
(void) strcpy(s_instance,ptr);
|
|
ptr += strlen(s_instance) + 1;
|
|
|
|
(void) strcpy(rlm,ptr);
|
|
ptr += strlen(rlm) + 1;
|
|
|
|
lifetime = (unsigned long) ptr[0];
|
|
kvno = (unsigned long) ptr[1];
|
|
tkt->length = (int) ptr[2];
|
|
ptr += 3;
|
|
bcopy(ptr,(char *)(tkt->dat),tkt->length);
|
|
ptr += tkt->length;
|
|
|
|
if (strcmp(s_name, service) || strcmp(s_instance, sinstance) ||
|
|
strcmp(rlm, realm)) /* not what we asked for */
|
|
return(INTK_ERR); /* we need a better code here XXX */
|
|
|
|
/* check KDC time stamp */
|
|
bcopy(ptr,(char *)&kdc_time,4); /* Time (coarse) */
|
|
if (swap_bytes) swap_u_long(kdc_time);
|
|
|
|
ptr += 4;
|
|
|
|
(void) gettimeofday(&tt_local,(struct timezone *) 0);
|
|
if (abs((int)(tt_local.tv_sec - kdc_time)) > CLOCK_SKEW) {
|
|
return(RD_AP_TIME); /* XXX should probably be better
|
|
code */
|
|
}
|
|
|
|
if ((kerror = save_credentials(s_name,s_instance,rlm,ses,lifetime,
|
|
kvno,tkt,tt_local.tv_sec)))
|
|
return(kerror);
|
|
|
|
return(AD_OK);
|
|
}
|