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/*
* Copyright 1987 by the Massachusetts Institute of Technology.
*
* For copying and distribution information, please see the file
* MIT.Copyright.
*
* kprop/kpropd have been abandonded by Project Athena (for good reason)
* however they still form the basis for one of the better ways for
* distributing kerberos databases. This version of kpropd has been
* adapted from the MIT distribution to work properly in a 4.4BSD
* environment.
*
* $Revision: 1.1.1.1 $ $Date: 1995/08/03 07:37:19 $ $State: Exp $
* $Source: /usr/cvs/src/eBones/kpropd/kpropd.c,v $
*
* Log: kpropd.c,v
* Revision 4.5 92/10/23 15:45:46 tytso Make it possible
* to specify the location of the kdb_util program.
*
* Revision 4.4 91/06/15 03:20:51 probe Fixed <sys/types.h> inclusion
*
* Revision 4.3 89/05/16 15:06:04 wesommer Fix operator precedence stuff.
* Programmer: John Kohl.
*
* Revision 4.2 89/03/23 10:24:00 jtkohl NOENCRYPTION changes
*
* Revision 4.1 89/01/24 20:33:48 root name change
*
* Revision 4.0 89/01/24 18:45:06 wesommer Original version; programmer:
* wesommer auditor: jon
*
* Revision 4.5 88/01/08 18:07:46 jon formatting and rcs header changes */
/*
* This program is run on slave servers, to catch updates "pushed" from the
* master kerberos server in a realm.
*/
#if 0
#ifndef lint
static char rcsid_kpropd_c[] =
"$Header: /usr/cvs/src/eBones/kpropd/kpropd.c,v 1.1.1.1 1995/08/03 07:37:19 mark Exp $";
#endif /* lint */
#endif
#include <errno.h>
#include <unistd.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <syslog.h>
#include <krb.h>
#include <krb_db.h>
#include "kprop.h"
static char kprop_version[KPROP_PROT_VERSION_LEN] = KPROP_PROT_VERSION;
int debug = 0;
int pause_int = 300; /* 5 minutes in seconds */
unsigned long get_data_checksum(int fd, Key_schedule key_sched);
void recv_auth(int in, int out, int private,
struct sockaddr_in *remote, struct sockaddr_in *local,
AUTH_DAT *ad);
static void SlowDeath(void);
void recv_clear(int in, int out);
/* leave room for private msg overhead */
static char buf[KPROP_BUFSIZ + 64];
static void
usage()
{
fprintf(stderr, "\nUsage: kpropd [-r realm] [-s srvtab] [-P kdb_util] fname\n");
exit(2);
}
void
main(argc, argv)
int argc;
char **argv;
{
struct sockaddr_in from;
struct sockaddr_in sin;
int s2, fd, n, fdlock;
int from_len;
char local_file[256];
char local_temp[256];
struct hostent *hp;
char hostname[256];
char from_str[128];
long kerror;
AUTH_DAT auth_dat;
KTEXT_ST ticket;
char my_instance[INST_SZ];
char my_realm[REALM_SZ];
char cmd[1024];
short net_transfer_mode, transfer_mode;
Key_schedule session_sched;
char version[9];
int c;
extern char *optarg;
extern int optind;
int rflag = 0;
char *srvtab = "";
char *local_db = DBM_FILE;
char *kdb_util = KPROP_KDB_UTIL;
if (argv[argc - 1][0] == 'k' && isdigit(argv[argc - 1][1])) {
argc--; /* ttys file hack */
}
while ((c = getopt(argc, argv, "r:s:d:P:")) != EOF) {
switch (c) {
case 'r':
rflag++;
strcpy(my_realm, optarg);
break;
case 's':
srvtab = optarg;
break;
case 'd':
local_db = optarg;
break;
case 'P':
kdb_util = optarg;
break;
default:
usage();
break;
}
}
if (optind != argc - 1)
usage();
openlog("kpropd", LOG_PID, LOG_AUTH);
strcpy(local_file, argv[optind]);
strcat(strcpy(local_temp, argv[optind]), ".tmp");
#ifdef STANDALONE
if ((sp = getservbyname("krb_prop", "tcp")) == NULL) {
syslog(LOG_ERR, "tcp/krb_prop: unknown service.");
SlowDeath();
}
bzero(&sin, sizeof sin);
sin.sin_port = sp->s_port;
sin.sin_family = AF_INET;
if ((s = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
syslog(LOG_ERR, "socket: %m");
SlowDeath();
}
if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0) {
syslog(LOG_ERR, "bind: %m");
SlowDeath();
}
#endif /* STANDALONE */
if (!rflag) {
kerror = krb_get_lrealm(my_realm, 1);
if (kerror != KSUCCESS) {
syslog(LOG_ERR, "can't get local realm. %s",
krb_err_txt[kerror]);
SlowDeath();
}
}
if (gethostname(my_instance, sizeof(my_instance)) != 0) {
syslog(LOG_ERR, "gethostname: %m");
SlowDeath();
}
#ifdef STANDALONE
listen(s, 5);
for (;;) {
from_len = sizeof from;
if ((s2 = accept(s, (struct sockaddr *)&from, &from_len)) < 0) {
syslog(LOG_ERR, "accept: %m");
continue;
}
#else /* !STANDALONE */
s2 = 0;
from_len = sizeof from;
if (getpeername(0, (struct sockaddr *)&from, &from_len) < 0) {
syslog(LOG_ERR, "getpeername: %m");
SlowDeath();
}
#endif /* !STANDALONE */
strcpy(from_str, inet_ntoa(from.sin_addr));
if ((hp = gethostbyaddr((char *) &(from.sin_addr.s_addr),
from_len, AF_INET)) == NULL) {
strcpy(hostname, "UNKNOWN");
} else {
strcpy(hostname, hp->h_name);
}
syslog(LOG_INFO, "connection from %s, %s", hostname, from_str);
/* for krb_rd_{priv, safe} */
n = sizeof sin;
if (getsockname(s2, (struct sockaddr *)&sin, &n) != 0) {
syslog(LOG_ERR, "can't get socketname: %m");
SlowDeath();
}
if (n != sizeof(sin)) {
syslog(LOG_ERR, "can't get socketname (length)");
SlowDeath();
}
if ((fdlock = open(local_temp, O_WRONLY | O_CREAT, 0600)) < 0) {
syslog(LOG_ERR, "open: %m");
SlowDeath();
}
if (flock(fdlock, LOCK_EX | LOCK_NB)) {
syslog(LOG_ERR, "flock: %m");
SlowDeath();
}
if ((fd = creat(local_temp, 0600)) < 0) {
syslog(LOG_ERR, "creat: %m");
SlowDeath();
}
if ((n = read(s2, buf, sizeof(kprop_version)))
!= sizeof(kprop_version)) {
syslog(LOG_ERR,
"can't read protocol version (%d bytes)", n);
SlowDeath();
}
if (strncmp(buf, kprop_version, sizeof(kprop_version)) != 0) {
syslog(LOG_ERR, "unsupported version %s", buf);
SlowDeath();
}
if ((n = read(s2, &net_transfer_mode,
sizeof(net_transfer_mode)))
!= sizeof(net_transfer_mode)) {
syslog(LOG_ERR, "can't read transfer mode");
SlowDeath();
}
transfer_mode = ntohs(net_transfer_mode);
kerror = krb_recvauth(KOPT_DO_MUTUAL, s2, &ticket,
KPROP_SERVICE_NAME,
my_instance,
&from,
&sin,
&auth_dat,
srvtab,
session_sched,
version);
if (kerror != KSUCCESS) {
syslog(LOG_ERR, "%s calling getkdata",
krb_err_txt[kerror]);
SlowDeath();
}
syslog(LOG_INFO, "connection from %s.%s@%s",
auth_dat.pname, auth_dat.pinst, auth_dat.prealm);
/*
* AUTHORIZATION is done here. We might want to expand this
* to read an acl file at some point, but allowing for now
* KPROP_SERVICE_NAME.KRB_MASTER@local-realm is fine ...
*/
if ((strcmp(KPROP_SERVICE_NAME, auth_dat.pname) != 0) ||
(strcmp(KRB_MASTER, auth_dat.pinst) != 0) ||
(strcmp(my_realm, auth_dat.prealm) != 0)) {
syslog(LOG_NOTICE, "authorization denied");
SlowDeath();
}
switch (transfer_mode) {
case KPROP_TRANSFER_PRIVATE:
recv_auth(s2, fd, 1 /* private */ , &from, &sin, &auth_dat);
break;
case KPROP_TRANSFER_SAFE:
recv_auth(s2, fd, 0 /* safe */ , &from, &sin, &auth_dat);
break;
case KPROP_TRANSFER_CLEAR:
recv_clear(s2, fd);
break;
default:
syslog(LOG_ERR, "bad transfer mode %d", transfer_mode);
SlowDeath();
}
if (transfer_mode != KPROP_TRANSFER_PRIVATE) {
syslog(LOG_ERR, "non-private transfers not supported\n");
SlowDeath();
#ifdef doesnt_work_yet
lseek(fd, (long) 0, L_SET);
if (auth_dat.checksum != get_data_checksum(fd, session_sched)) {
syslog(LOG_ERR, "checksum doesn't match");
SlowDeath();
}
#endif
} else {
struct stat st;
fstat(fd, &st);
if (st.st_size != auth_dat.checksum) {
syslog(LOG_ERR, "length doesn't match");
SlowDeath();
}
}
close(fd);
close(s2);
if (rename(local_temp, local_file) < 0) {
syslog(LOG_ERR, "rename: %m");
SlowDeath();
}
if (flock(fdlock, LOCK_UN)) {
syslog(LOG_ERR, "flock (unlock): %m");
SlowDeath();
}
close(fdlock);
sprintf(cmd, "%s load %s %s\n", kdb_util, local_file, local_db);
if (system(cmd) != 0) {
syslog(LOG_ERR, "couldn't load database");
SlowDeath();
}
#ifdef STANDALONE
}
#endif
}
void
recv_auth(in, out, private, remote, local, ad)
int in, out;
int private;
struct sockaddr_in *remote, *local;
AUTH_DAT *ad;
{
u_long length;
long kerror;
int n;
MSG_DAT msg_data;
Key_schedule session_sched;
if (private)
#ifdef NOENCRYPTION
bzero((char *) session_sched, sizeof(session_sched));
#else
if (key_sched((C_Block *)ad->session, session_sched)) {
syslog(LOG_ERR, "can't make key schedule");
SlowDeath();
}
#endif
while (1) {
n = krb_net_read(in, (char *)&length, sizeof length);
if (n == 0)
break;
if (n < 0) {
syslog(LOG_ERR, "read: %m");
SlowDeath();
}
length = ntohl(length);
if (length > sizeof buf) {
syslog(LOG_ERR, "read length %d, bigger than buf %d",
length, sizeof buf);
SlowDeath();
}
n = krb_net_read(in, buf, length);
if (n < 0) {
syslog(LOG_ERR, "kpropd: read: %m");
SlowDeath();
}
if (private)
kerror = krb_rd_priv(buf, n, session_sched, ad->session,
remote, local, &msg_data);
else
kerror = krb_rd_safe(buf, n, (C_Block *)ad->session,
remote, local, &msg_data);
if (kerror != KSUCCESS) {
syslog(LOG_ERR, "%s: %s",
private ? "krb_rd_priv" : "krb_rd_safe",
krb_err_txt[kerror]);
SlowDeath();
}
if (write(out, msg_data.app_data, msg_data.app_length) !=
msg_data.app_length) {
syslog(LOG_ERR, "write: %m");
SlowDeath();
}
}
}
void
recv_clear(in, out)
int in, out;
{
int n;
while (1) {
n = read(in, buf, sizeof buf);
if (n == 0)
break;
if (n < 0) {
syslog(LOG_ERR, "read: %m");
SlowDeath();
}
if (write(out, buf, n) != n) {
syslog(LOG_ERR, "write: %m");
SlowDeath();
}
}
}
static void
SlowDeath()
{
#ifdef STANDALONE
sleep(pause_int);
#endif
exit(1);
}
#ifdef doesnt_work_yet
unsigned long
get_data_checksum(fd, key_sched)
int fd;
Key_schedule key_sched;
{
unsigned long cksum = 0;
unsigned long cbc_cksum();
int n;
char buf[BUFSIZ];
char obuf[8];
while (n = read(fd, buf, sizeof buf)) {
if (n < 0) {
syslog(LOG_ERR, "read (in checksum test): %m");
SlowDeath();
}
#ifndef NOENCRYPTION
cksum += cbc_cksum(buf, obuf, n, key_sched, key_sched);
#endif
}
return cksum;
}
#endif
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