mirror of
https://github.com/freebsd/freebsd-src.git
synced 2024-12-04 14:39:37 +00:00
298 lines
8.7 KiB
C
298 lines
8.7 KiB
C
/*
|
|
* Copyright 1986, 1987, 1988 by the Massachusetts Institute
|
|
* of Technology.
|
|
* For copying and distribution information, please see the file
|
|
* <Copyright.MIT>.
|
|
*
|
|
* from: der: krb_get_in_tkt.c,v 4.19 89/07/18 16:31:31 jtkohl Exp $
|
|
* $Id: krb_get_in_tkt.c,v 1.1.1.1 1994/09/30 14:50:02 csgr Exp $
|
|
*/
|
|
|
|
#ifndef lint
|
|
static char *rcsid =
|
|
"$Id: krb_get_in_tkt.c,v 1.1.1.1 1994/09/30 14:50:02 csgr Exp $";
|
|
#endif /* lint */
|
|
|
|
#include <krb.h>
|
|
#include <des.h>
|
|
#include <prot.h>
|
|
|
|
#include <stdio.h>
|
|
#include <strings.h>
|
|
#include <errno.h>
|
|
|
|
/* use the bsd time.h struct defs for PC too! */
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
|
|
int swap_bytes;
|
|
|
|
/*
|
|
* decrypt_tkt(): Given user, instance, realm, passwd, key_proc
|
|
* and the cipher text sent from the KDC, decrypt the cipher text
|
|
* using the key returned by key_proc.
|
|
*/
|
|
|
|
static int decrypt_tkt(user, instance, realm, arg, key_proc, cipp)
|
|
char *user;
|
|
char *instance;
|
|
char *realm;
|
|
char *arg;
|
|
int (*key_proc)();
|
|
KTEXT *cipp;
|
|
{
|
|
KTEXT cip = *cipp;
|
|
C_Block key; /* Key for decrypting cipher */
|
|
Key_schedule key_s;
|
|
|
|
#ifndef NOENCRYPTION
|
|
/* Attempt to decrypt it */
|
|
#endif
|
|
|
|
/* generate a key */
|
|
|
|
{
|
|
register int rc;
|
|
rc = (*key_proc)(user,instance,realm,arg,key);
|
|
if (rc)
|
|
return(rc);
|
|
}
|
|
|
|
#ifndef NOENCRYPTION
|
|
key_sched(key,key_s);
|
|
pcbc_encrypt((C_Block *)cip->dat,(C_Block *)cip->dat,
|
|
(long) cip->length,key_s,key,DES_DECRYPT);
|
|
#endif /* !NOENCRYPTION */
|
|
/* Get rid of all traces of key */
|
|
bzero((char *)key,sizeof(key));
|
|
bzero((char *)key_s,sizeof(key_s));
|
|
|
|
return(0);
|
|
}
|
|
|
|
/*
|
|
* krb_get_in_tkt() gets a ticket for a given principal to use a given
|
|
* service and stores the returned ticket and session key for future
|
|
* use.
|
|
*
|
|
* The "user", "instance", and "realm" arguments give the identity of
|
|
* the client who will use the ticket. The "service" and "sinstance"
|
|
* arguments give the identity of the server that the client wishes
|
|
* to use. (The realm of the server is the same as the Kerberos server
|
|
* to whom the request is sent.) The "life" argument indicates the
|
|
* desired lifetime of the ticket; the "key_proc" argument is a pointer
|
|
* to the routine used for getting the client's private key to decrypt
|
|
* the reply from Kerberos. The "decrypt_proc" argument is a pointer
|
|
* to the routine used to decrypt the reply from Kerberos; and "arg"
|
|
* is an argument to be passed on to the "key_proc" routine.
|
|
*
|
|
* If all goes well, krb_get_in_tkt() returns INTK_OK, otherwise it
|
|
* returns an error code: If an AUTH_MSG_ERR_REPLY packet is returned
|
|
* by Kerberos, then the error code it contains is returned. Other
|
|
* error codes returned by this routine include INTK_PROT to indicate
|
|
* wrong protocol version, INTK_BADPW to indicate bad password (if
|
|
* decrypted ticket didn't make sense), INTK_ERR if the ticket was for
|
|
* the wrong server or the ticket store couldn't be initialized.
|
|
*
|
|
* The format of the message sent to Kerberos is as follows:
|
|
*
|
|
* Size Variable Field
|
|
* ---- -------- -----
|
|
*
|
|
* 1 byte KRB_PROT_VERSION protocol version number
|
|
* 1 byte AUTH_MSG_KDC_REQUEST | message type
|
|
* HOST_BYTE_ORDER local byte order in lsb
|
|
* string user client's name
|
|
* string instance client's instance
|
|
* string realm client's realm
|
|
* 4 bytes tlocal.tv_sec timestamp in seconds
|
|
* 1 byte life desired lifetime
|
|
* string service service's name
|
|
* string sinstance service's instance
|
|
*/
|
|
|
|
krb_get_in_tkt(user, instance, realm, service, sinstance, life,
|
|
key_proc, decrypt_proc, arg)
|
|
char *user;
|
|
char *instance;
|
|
char *realm;
|
|
char *service;
|
|
char *sinstance;
|
|
int life;
|
|
int (*key_proc)();
|
|
int (*decrypt_proc)();
|
|
char *arg;
|
|
{
|
|
KTEXT_ST pkt_st;
|
|
KTEXT pkt = &pkt_st; /* Packet to KDC */
|
|
KTEXT_ST rpkt_st;
|
|
KTEXT rpkt = &rpkt_st; /* Returned packet */
|
|
KTEXT_ST cip_st;
|
|
KTEXT cip = &cip_st; /* Returned Ciphertext */
|
|
KTEXT_ST tkt_st;
|
|
KTEXT tkt = &tkt_st; /* Current ticket */
|
|
C_Block ses; /* Session key for tkt */
|
|
int kvno; /* Kvno for session key */
|
|
unsigned char *v = pkt->dat; /* Prot vers no */
|
|
unsigned char *t = (pkt->dat+1); /* Prot msg type */
|
|
|
|
char s_name[SNAME_SZ];
|
|
char s_instance[INST_SZ];
|
|
char rlm[REALM_SZ];
|
|
int lifetime;
|
|
int msg_byte_order;
|
|
int kerror;
|
|
unsigned long exp_date;
|
|
char *ptr;
|
|
|
|
struct timeval t_local;
|
|
|
|
unsigned long rep_err_code;
|
|
|
|
unsigned long kdc_time; /* KDC time */
|
|
|
|
/* BUILD REQUEST PACKET */
|
|
|
|
/* Set up the fixed part of the packet */
|
|
*v = (unsigned char) KRB_PROT_VERSION;
|
|
*t = (unsigned char) AUTH_MSG_KDC_REQUEST;
|
|
*t |= HOST_BYTE_ORDER;
|
|
|
|
/* Now for the variable info */
|
|
(void) strcpy((char *)(pkt->dat+2),user); /* aname */
|
|
pkt->length = 3 + strlen(user);
|
|
(void) strcpy((char *)(pkt->dat+pkt->length),
|
|
instance); /* instance */
|
|
pkt->length += 1 + strlen(instance);
|
|
(void) strcpy((char *)(pkt->dat+pkt->length),realm); /* realm */
|
|
pkt->length += 1 + strlen(realm);
|
|
|
|
(void) gettimeofday(&t_local,(struct timezone *) 0);
|
|
/* timestamp */
|
|
bcopy((char *)&(t_local.tv_sec),(char *)(pkt->dat+pkt->length), 4);
|
|
pkt->length += 4;
|
|
|
|
*(pkt->dat+(pkt->length)++) = (char) life;
|
|
(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 AND RECEIVE THE RETURN PACKET */
|
|
|
|
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((int)rep_err_code);
|
|
default:
|
|
return(INTK_PROT);
|
|
}
|
|
|
|
/* EXTRACT INFORMATION FROM RETURN PACKET */
|
|
|
|
/* get the principal's expiration date */
|
|
bcopy(pkt_x_date(rpkt),(char *) &exp_date,sizeof(exp_date));
|
|
if (swap_bytes) swap_u_long(exp_date);
|
|
|
|
/* Extract the ciphertext */
|
|
cip->length = pkt_clen(rpkt); /* let clen do the swap */
|
|
|
|
if ((cip->length < 0) || (cip->length > sizeof(cip->dat)))
|
|
return(INTK_ERR); /* no appropriate error code
|
|
currently defined for INTK_ */
|
|
/* copy information from return packet into "cip" */
|
|
bcopy((char *) pkt_cipher(rpkt),(char *)(cip->dat),cip->length);
|
|
|
|
/* Attempt to decrypt the reply. */
|
|
if (decrypt_proc == NULL)
|
|
decrypt_proc = decrypt_tkt;
|
|
(*decrypt_proc)(user, instance, realm, arg, key_proc, &cip);
|
|
|
|
ptr = (char *) cip->dat;
|
|
|
|
/* extract session key */
|
|
bcopy(ptr,(char *)ses,8);
|
|
ptr += 8;
|
|
|
|
if ((strlen(ptr) + (ptr - (char *) cip->dat)) > cip->length)
|
|
return(INTK_BADPW);
|
|
|
|
/* extract server's name */
|
|
(void) strcpy(s_name,ptr);
|
|
ptr += strlen(s_name) + 1;
|
|
|
|
if ((strlen(ptr) + (ptr - (char *) cip->dat)) > cip->length)
|
|
return(INTK_BADPW);
|
|
|
|
/* extract server's instance */
|
|
(void) strcpy(s_instance,ptr);
|
|
ptr += strlen(s_instance) + 1;
|
|
|
|
if ((strlen(ptr) + (ptr - (char *) cip->dat)) > cip->length)
|
|
return(INTK_BADPW);
|
|
|
|
/* extract server's realm */
|
|
(void) strcpy(rlm,ptr);
|
|
ptr += strlen(rlm) + 1;
|
|
|
|
/* extract ticket lifetime, server key version, ticket length */
|
|
/* be sure to avoid sign extension on lifetime! */
|
|
lifetime = (unsigned char) ptr[0];
|
|
kvno = (unsigned char) ptr[1];
|
|
tkt->length = (unsigned char) ptr[2];
|
|
ptr += 3;
|
|
|
|
if ((tkt->length < 0) ||
|
|
((tkt->length + (ptr - (char *) cip->dat)) > cip->length))
|
|
return(INTK_BADPW);
|
|
|
|
/* extract ticket itself */
|
|
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(&t_local,(struct timezone *) 0);
|
|
if (abs((int)(t_local.tv_sec - kdc_time)) > CLOCK_SKEW) {
|
|
return(RD_AP_TIME); /* XXX should probably be better
|
|
code */
|
|
}
|
|
|
|
/* initialize ticket cache */
|
|
if (in_tkt(user,instance) != KSUCCESS)
|
|
return(INTK_ERR);
|
|
|
|
/* stash ticket, session key, etc. for future use */
|
|
if (kerror = save_credentials(s_name, s_instance, rlm, ses,
|
|
lifetime, kvno, tkt, t_local.tv_sec))
|
|
return(kerror);
|
|
|
|
return(INTK_OK);
|
|
}
|