freebsd-dev/crypto/kerberosIV/appl/bsd/kcmd.c
1999-09-19 14:19:32 +00:00

273 lines
6.7 KiB
C

/*
* Copyright (c) 1983, 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.
*/
#include "bsd_locl.h"
RCSID("$Id: kcmd.c,v 1.20 1998/07/13 13:54:07 assar Exp $");
#define START_PORT 5120 /* arbitrary */
static int
getport(int *alport)
{
struct sockaddr_in sin;
int s;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = INADDR_ANY;
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0)
return (-1);
for (;;) {
sin.sin_port = htons((u_short)*alport);
if (bind(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
return (s);
if (errno != EADDRINUSE) {
close(s);
return (-1);
}
(*alport)--;
#ifdef ATHENA_COMPAT
if (*alport == IPPORT_RESERVED/2) {
#else
if (*alport == IPPORT_RESERVED) {
#endif
close(s);
errno = EAGAIN; /* close */
return (-1);
}
}
}
int
kcmd(int *sock,
char **ahost,
u_int16_t rport,
char *locuser,
char *remuser,
char *cmd,
int *fd2p,
KTEXT ticket,
char *service,
char *realm,
CREDENTIALS *cred,
Key_schedule schedule,
MSG_DAT *msg_data,
struct sockaddr_in *laddr,
struct sockaddr_in *faddr,
int32_t authopts)
{
int s, timo = 1;
pid_t pid;
struct sockaddr_in sin, from;
char c;
#ifdef ATHENA_COMPAT
int lport = IPPORT_RESERVED - 1;
#else
int lport = START_PORT;
#endif
struct hostent *hp;
int rc;
char *host_save;
int status;
char **h_addr_list;
pid = getpid();
hp = gethostbyname(*ahost);
if (hp == NULL) {
/* fprintf(stderr, "%s: unknown host\n", *ahost); */
return (-1);
}
host_save = strdup(hp->h_name);
if (host_save == NULL)
return -1;
*ahost = host_save;
h_addr_list = hp->h_addr_list;
/* If realm is null, look up from table */
if (realm == NULL || realm[0] == '\0')
realm = krb_realmofhost(host_save);
for (;;) {
s = getport(&lport);
if (s < 0) {
if (errno == EAGAIN)
warnx("kcmd(socket): All ports in use\n");
else
warn("kcmd: socket");
return (-1);
}
sin.sin_family = hp->h_addrtype;
memcpy (&sin.sin_addr, h_addr_list[0], sizeof(sin.sin_addr));
sin.sin_port = rport;
if (connect(s, (struct sockaddr *)&sin, sizeof(sin)) >= 0)
break;
close(s);
if (errno == EADDRINUSE) {
lport--;
continue;
}
/*
* don't wait very long for Kerberos rcmd.
*/
if (errno == ECONNREFUSED && timo <= 4) {
/* sleep(timo); don't wait at all here */
timo *= 2;
continue;
}
if (h_addr_list[1] != NULL) {
warn ("kcmd: connect (%s)",
inet_ntoa(sin.sin_addr));
h_addr_list++;
memcpy(&sin.sin_addr,
*h_addr_list,
sizeof(sin.sin_addr));
fprintf(stderr, "Trying %s...\n",
inet_ntoa(sin.sin_addr));
continue;
}
if (errno != ECONNREFUSED)
warn ("connect(%s)", hp->h_name);
return (-1);
}
lport--;
if (fd2p == 0) {
write(s, "", 1);
lport = 0;
} else {
char num[8];
int s2 = getport(&lport), s3;
int len = sizeof(from);
if (s2 < 0) {
status = -1;
goto bad;
}
listen(s2, 1);
snprintf(num, sizeof(num), "%d", lport);
if (write(s, num, strlen(num) + 1) != strlen(num) + 1) {
warn("kcmd(write): setting up stderr");
close(s2);
status = -1;
goto bad;
}
{
fd_set fds;
FD_ZERO(&fds);
FD_SET(s, &fds);
FD_SET(s2, &fds);
status = select(FD_SETSIZE, &fds, NULL, NULL, NULL);
if(FD_ISSET(s, &fds)){
warnx("kcmd: connection unexpectedly closed.");
close(s2);
status = -1;
goto bad;
}
}
s3 = accept(s2, (struct sockaddr *)&from, &len);
close(s2);
if (s3 < 0) {
warn ("kcmd: accept");
lport = 0;
status = -1;
goto bad;
}
*fd2p = s3;
from.sin_port = ntohs((u_short)from.sin_port);
if (from.sin_family != AF_INET ||
from.sin_port >= IPPORT_RESERVED) {
warnx("kcmd(socket): "
"protocol failure in circuit setup.");
status = -1;
goto bad2;
}
}
/*
* Kerberos-authenticated service. Don't have to send locuser,
* since its already in the ticket, and we'll extract it on
* the other side.
*/
/* write(s, locuser, strlen(locuser)+1); */
/* set up the needed stuff for mutual auth, but only if necessary */
if (authopts & KOPT_DO_MUTUAL) {
int sin_len;
*faddr = sin;
sin_len = sizeof(struct sockaddr_in);
if (getsockname(s, (struct sockaddr *)laddr, &sin_len) < 0) {
warn("kcmd(getsockname)");
status = -1;
goto bad2;
}
}
if ((status = krb_sendauth(authopts, s, ticket, service, *ahost,
realm, (unsigned long) getpid(), msg_data,
cred, schedule,
laddr,
faddr,
"KCMDV0.1")) != KSUCCESS)
goto bad2;
write(s, remuser, strlen(remuser)+1);
write(s, cmd, strlen(cmd)+1);
if ((rc = read(s, &c, 1)) != 1) {
if (rc == -1)
warn("read(%s)", *ahost);
else
warnx("kcmd: bad connection with remote host");
status = -1;
goto bad2;
}
if (c != '\0') {
while (read(s, &c, 1) == 1) {
write(2, &c, 1);
if (c == '\n')
break;
}
status = -1;
goto bad2;
}
*sock = s;
return (KSUCCESS);
bad2:
if (lport)
close(*fd2p);
bad:
close(s);
return (status);
}