798 lines
20 KiB
C
798 lines
20 KiB
C
/* $NetBSD: rlogind.c,v 1.24 2001/02/04 22:14:13 christos Exp $ */
|
|
|
|
/*
|
|
* Copyright (C) 1998 WIDE Project.
|
|
* 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 WIDE Project and
|
|
* its contributors.
|
|
* 4. Neither the name of the project 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 PROJECT 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 PROJECT 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.
|
|
*/
|
|
|
|
/*-
|
|
* Copyright (c) 1983, 1988, 1989, 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 <sys/cdefs.h>
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1989, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n");
|
|
#if 0
|
|
static char sccsid[] = "@(#)rlogind.c 8.2 (Berkeley) 4/28/95";
|
|
#else
|
|
__RCSID("$NetBSD: rlogind.c,v 1.24 2001/02/04 22:14:13 christos Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* remote login server:
|
|
* \0
|
|
* remuser\0
|
|
* locuser\0
|
|
* terminal_type/speed\0
|
|
* data
|
|
*/
|
|
|
|
#define FD_SETSIZE 16 /* don't need many bits for select */
|
|
#include <sys/param.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/ioctl.h>
|
|
#include <signal.h>
|
|
#include <termios.h>
|
|
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
|
|
#include <pwd.h>
|
|
#include <syslog.h>
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <unistd.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <util.h>
|
|
#include <utmp.h>
|
|
#include "pathnames.h"
|
|
|
|
#ifndef TIOCPKT_WINDOW
|
|
#define TIOCPKT_WINDOW 0x80
|
|
#endif
|
|
|
|
#define OPTIONS "alnL"
|
|
|
|
char *env[2];
|
|
#define NMAX 30
|
|
char lusername[NMAX+1], rusername[NMAX+1];
|
|
static char term[64] = "TERM=";
|
|
#define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */
|
|
int keepalive = 1;
|
|
int check_all = 0;
|
|
int log_success = 0;
|
|
|
|
struct passwd *pwd;
|
|
|
|
void doit __P((int, struct sockaddr *));
|
|
int control __P((int, char *, int));
|
|
void protocol __P((int, int));
|
|
void cleanup __P((int));
|
|
void fatal __P((int, char *, int));
|
|
int do_rlogin __P((struct sockaddr *, char *));
|
|
void getstr __P((char *, int, char *));
|
|
void setup_term __P((int));
|
|
#if 0
|
|
int do_krb_login __P((union sockunion *));
|
|
#endif
|
|
void usage __P((void));
|
|
int local_domain __P((char *));
|
|
char *topdomain __P((char *));
|
|
int main __P((int, char *[]));
|
|
|
|
extern int __check_rhosts_file;
|
|
extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c */
|
|
extern char **environ;
|
|
|
|
int
|
|
main(argc, argv)
|
|
int argc;
|
|
char *argv[];
|
|
{
|
|
struct sockaddr_storage from;
|
|
int ch, fromlen, on;
|
|
|
|
openlog("rlogind", LOG_PID, LOG_AUTH);
|
|
|
|
opterr = 0;
|
|
while ((ch = getopt(argc, argv, OPTIONS)) != -1)
|
|
switch (ch) {
|
|
case 'a':
|
|
check_all = 1;
|
|
break;
|
|
case 'l':
|
|
__check_rhosts_file = 0;
|
|
break;
|
|
case 'n':
|
|
keepalive = 0;
|
|
break;
|
|
case 'L':
|
|
log_success = 1;
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
break;
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
fromlen = sizeof (from); /* xxx */
|
|
if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
|
|
syslog(LOG_ERR,"Can't get peer name of remote host: %m");
|
|
fatal(STDERR_FILENO, "Can't get peer name of remote host", 1);
|
|
}
|
|
#ifdef INET6
|
|
if (((struct sockaddr *)&from)->sa_family == AF_INET6 &&
|
|
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr) &&
|
|
sizeof(struct sockaddr_in) <= sizeof(from)) {
|
|
struct sockaddr_in sin;
|
|
struct sockaddr_in6 *sin6;
|
|
const int off = sizeof(struct sockaddr_in6) -
|
|
sizeof(struct sockaddr_in);
|
|
|
|
sin6 = (struct sockaddr_in6 *)&from;
|
|
memset(&sin, 0, sizeof(sin));
|
|
sin.sin_family = AF_INET;
|
|
sin.sin_len = sizeof(struct sockaddr_in);
|
|
memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[off],
|
|
sizeof(sin.sin_addr));
|
|
memcpy(&from, &sin, sizeof(sin));
|
|
fromlen = sin.sin_len;
|
|
}
|
|
#else
|
|
if (((struct sockaddr *)&from)->sa_family == AF_INET6 &&
|
|
IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr)) {
|
|
char hbuf[NI_MAXHOST];
|
|
if (getnameinfo((struct sockaddr *)&from, fromlen, hbuf,
|
|
sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) {
|
|
strncpy(hbuf, "invalid", sizeof(hbuf));
|
|
}
|
|
syslog(LOG_ERR, "malformed \"from\" address (v4 mapped, %s)\n",
|
|
hbuf);
|
|
exit(1);
|
|
}
|
|
#endif
|
|
on = 1;
|
|
if (keepalive &&
|
|
setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0)
|
|
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
|
|
#if defined(IP_TOS)
|
|
if (((struct sockaddr *)&from)->sa_family == AF_INET) {
|
|
on = IPTOS_LOWDELAY;
|
|
if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0)
|
|
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
|
|
}
|
|
#endif
|
|
doit(0, (struct sockaddr *)&from);
|
|
/* NOTREACHED */
|
|
#ifdef __GNUC__
|
|
exit(0);
|
|
#endif
|
|
}
|
|
|
|
int child;
|
|
int netf;
|
|
char line[MAXPATHLEN];
|
|
int confirmed;
|
|
|
|
struct winsize win = { 0, 0, 0, 0 };
|
|
|
|
|
|
void
|
|
doit(f, fromp)
|
|
int f;
|
|
struct sockaddr *fromp;
|
|
{
|
|
int master, pid, on = 1;
|
|
int authenticated = 0;
|
|
char utmphost[UT_HOSTSIZE + 1];
|
|
char *hostname;
|
|
char hostnamebuf[2 * MAXHOSTNAMELEN + 1];
|
|
char c;
|
|
char naddr[NI_MAXHOST];
|
|
char saddr[NI_MAXHOST];
|
|
char raddr[NI_MAXHOST];
|
|
int af = fromp->sa_family;
|
|
u_int16_t *portp;
|
|
struct addrinfo hints, *res, *res0;
|
|
int gaierror;
|
|
#ifdef NI_WITHSCOPEID
|
|
const int niflags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID;
|
|
#else
|
|
const int niflags = NI_NUMERICHOST | NI_NUMERICSERV;
|
|
#endif
|
|
|
|
alarm(60);
|
|
read(f, &c, 1);
|
|
|
|
if (c != 0)
|
|
exit(1);
|
|
|
|
alarm(0);
|
|
switch (af) {
|
|
case AF_INET:
|
|
portp = &((struct sockaddr_in *)fromp)->sin_port;
|
|
break;
|
|
#ifdef INET6
|
|
case AF_INET6:
|
|
portp = &((struct sockaddr_in6 *)fromp)->sin6_port;
|
|
break;
|
|
#endif
|
|
default:
|
|
syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af);
|
|
exit(1);
|
|
}
|
|
if (getnameinfo((struct sockaddr *)fromp, fromp->sa_len,
|
|
naddr, sizeof(naddr), NULL, 0, niflags) != 0) {
|
|
syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af);
|
|
exit(1);
|
|
}
|
|
|
|
if (getnameinfo((struct sockaddr *)fromp, fromp->sa_len,
|
|
saddr, sizeof(saddr), NULL, 0, NI_NAMEREQD) == 0) {
|
|
/*
|
|
* If name returned by gethostbyaddr is in our domain,
|
|
* attempt to verify that we haven't been fooled by someone
|
|
* in a remote net; look up the name and check that this
|
|
* address corresponds to the name.
|
|
*/
|
|
hostname = saddr;
|
|
res0 = NULL;
|
|
if (check_all || local_domain(saddr)) {
|
|
strncpy(hostnamebuf, saddr, sizeof(hostnamebuf) - 1);
|
|
hostnamebuf[sizeof(hostnamebuf) - 1] = 0;
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = fromp->sa_family;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_flags = AI_CANONNAME;
|
|
gaierror = getaddrinfo(hostnamebuf, "0", &hints, &res0);
|
|
if (gaierror) {
|
|
syslog(LOG_NOTICE,
|
|
"Couldn't look up address for %s: %s",
|
|
hostnamebuf, gai_strerror(gaierror));
|
|
hostname = naddr;
|
|
} else {
|
|
for (res = res0; res; res = res->ai_next) {
|
|
if (res->ai_family != fromp->sa_family)
|
|
continue;
|
|
if (res->ai_addrlen != fromp->sa_len)
|
|
continue;
|
|
if (getnameinfo(res->ai_addr,
|
|
res->ai_addrlen,
|
|
raddr, sizeof(raddr), NULL, 0,
|
|
niflags) == 0
|
|
&& strcmp(naddr, raddr) == 0) {
|
|
hostname = res->ai_canonname
|
|
? res->ai_canonname
|
|
: saddr;
|
|
break;
|
|
}
|
|
}
|
|
if (res == NULL) {
|
|
syslog(LOG_NOTICE,
|
|
"Host addr %s not listed for host %s",
|
|
naddr, res0->ai_canonname
|
|
? res0->ai_canonname
|
|
: saddr);
|
|
hostname = naddr;
|
|
}
|
|
}
|
|
}
|
|
hostname = strncpy(hostnamebuf, hostname,
|
|
sizeof(hostnamebuf) - 1);
|
|
if (res0)
|
|
freeaddrinfo(res0);
|
|
} else
|
|
hostname = strncpy(hostnamebuf, naddr,
|
|
sizeof(hostnamebuf) - 1);
|
|
|
|
hostnamebuf[sizeof(hostnamebuf) - 1] = '\0';
|
|
|
|
if (strlen(hostname) < sizeof(utmphost))
|
|
(void)strcpy(utmphost, hostname);
|
|
else
|
|
(void)strncpy(utmphost, hostname, sizeof(utmphost));
|
|
utmphost[sizeof(utmphost) - 1] = '\0';
|
|
|
|
if (ntohs(*portp) >= IPPORT_RESERVED ||
|
|
ntohs(*portp) < IPPORT_RESERVED/2) {
|
|
syslog(LOG_NOTICE, "Connection from %s on illegal port",
|
|
naddr);
|
|
fatal(f, "Permission denied", 0);
|
|
}
|
|
#ifdef IP_OPTIONS
|
|
if (fromp->sa_family == AF_INET) {
|
|
u_char optbuf[BUFSIZ/3], *cp;
|
|
char lbuf[BUFSIZ], *lp;
|
|
int optsize = sizeof(optbuf), ipproto;
|
|
struct protoent *ip;
|
|
|
|
if ((ip = getprotobyname("ip")) != NULL)
|
|
ipproto = ip->p_proto;
|
|
else
|
|
ipproto = IPPROTO_IP;
|
|
if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf,
|
|
&optsize) == 0 && optsize != 0) {
|
|
lp = lbuf;
|
|
for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3)
|
|
sprintf(lp, " %2.2x", *cp);
|
|
syslog(LOG_NOTICE,
|
|
"Connection received using IP options (ignored):%s",
|
|
lbuf);
|
|
if (setsockopt(0, ipproto, IP_OPTIONS,
|
|
(char *)NULL, optsize) != 0) {
|
|
syslog(LOG_ERR,
|
|
"setsockopt IP_OPTIONS NULL: %m");
|
|
exit(1);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
if (do_rlogin(fromp, hostname) == 0)
|
|
authenticated++;
|
|
if (confirmed == 0) {
|
|
write(f, "", 1);
|
|
confirmed = 1; /* we sent the null! */
|
|
}
|
|
netf = f;
|
|
|
|
pid = forkpty(&master, line, NULL, &win);
|
|
if (pid < 0) {
|
|
if (errno == ENOENT)
|
|
fatal(f, "Out of ptys", 0);
|
|
else
|
|
fatal(f, "Forkpty", 1);
|
|
}
|
|
if (pid == 0) {
|
|
if (f > 2) /* f should always be 0, but... */
|
|
(void) close(f);
|
|
setup_term(0);
|
|
if (authenticated)
|
|
execl(_PATH_LOGIN, "login", "-p",
|
|
"-h", utmphost, "-f", "--", lusername, (char *)0);
|
|
else
|
|
execl(_PATH_LOGIN, "login", "-p",
|
|
"-h", utmphost, "--", lusername, (char *)0);
|
|
fatal(STDERR_FILENO, _PATH_LOGIN, 1);
|
|
/*NOTREACHED*/
|
|
}
|
|
ioctl(f, FIONBIO, &on);
|
|
ioctl(master, FIONBIO, &on);
|
|
ioctl(master, TIOCPKT, &on);
|
|
signal(SIGCHLD, cleanup);
|
|
protocol(f, master);
|
|
signal(SIGCHLD, SIG_IGN);
|
|
cleanup(0);
|
|
}
|
|
|
|
char magic[2] = { 0377, 0377 };
|
|
char oobdata[] = {TIOCPKT_WINDOW};
|
|
|
|
/*
|
|
* Handle a "control" request (signaled by magic being present)
|
|
* in the data stream. For now, we are only willing to handle
|
|
* window size changes.
|
|
*/
|
|
int
|
|
control(pty, cp, n)
|
|
int pty;
|
|
char *cp;
|
|
int n;
|
|
{
|
|
struct winsize w;
|
|
|
|
if (n < 4+sizeof (w) || cp[2] != 's' || cp[3] != 's')
|
|
return (0);
|
|
oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */
|
|
memmove(&w, cp+4, sizeof(w));
|
|
w.ws_row = ntohs(w.ws_row);
|
|
w.ws_col = ntohs(w.ws_col);
|
|
w.ws_xpixel = ntohs(w.ws_xpixel);
|
|
w.ws_ypixel = ntohs(w.ws_ypixel);
|
|
(void)ioctl(pty, TIOCSWINSZ, &w);
|
|
return (4+sizeof (w));
|
|
}
|
|
|
|
/*
|
|
* rlogin "protocol" machine.
|
|
*/
|
|
void
|
|
protocol(f, p)
|
|
int f, p;
|
|
{
|
|
char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL;
|
|
/* XXX gcc above */
|
|
int pcc = 0, fcc = 0;
|
|
int cc, nfd, n;
|
|
char cntl;
|
|
|
|
/*
|
|
* Must ignore SIGTTOU, otherwise we'll stop
|
|
* when we try and set slave pty's window shape
|
|
* (our controlling tty is the master pty).
|
|
*/
|
|
(void) signal(SIGTTOU, SIG_IGN);
|
|
send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */
|
|
if (f > p)
|
|
nfd = f + 1;
|
|
else
|
|
nfd = p + 1;
|
|
if (nfd > FD_SETSIZE) {
|
|
syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE");
|
|
fatal(f, "internal error (select mask too small)", 0);
|
|
}
|
|
for (;;) {
|
|
fd_set ibits, obits, ebits, *omask;
|
|
|
|
FD_ZERO(&ebits);
|
|
FD_ZERO(&ibits);
|
|
FD_ZERO(&obits);
|
|
omask = (fd_set *)NULL;
|
|
if (fcc) {
|
|
FD_SET(p, &obits);
|
|
omask = &obits;
|
|
} else
|
|
FD_SET(f, &ibits);
|
|
if (pcc >= 0) {
|
|
if (pcc) {
|
|
FD_SET(f, &obits);
|
|
omask = &obits;
|
|
} else
|
|
FD_SET(p, &ibits);
|
|
}
|
|
FD_SET(p, &ebits);
|
|
if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
fatal(f, "select", 1);
|
|
}
|
|
if (n == 0) {
|
|
/* shouldn't happen... */
|
|
sleep(5);
|
|
continue;
|
|
}
|
|
#define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))
|
|
if (FD_ISSET(p, &ebits)) {
|
|
cc = read(p, &cntl, 1);
|
|
if (cc == 1 && pkcontrol(cntl)) {
|
|
cntl |= oobdata[0];
|
|
send(f, &cntl, 1, MSG_OOB);
|
|
if (cntl & TIOCPKT_FLUSHWRITE) {
|
|
pcc = 0;
|
|
FD_CLR(p, &ibits);
|
|
}
|
|
}
|
|
}
|
|
if (FD_ISSET(f, &ibits)) {
|
|
fcc = read(f, fibuf, sizeof(fibuf));
|
|
if (fcc < 0 && errno == EWOULDBLOCK)
|
|
fcc = 0;
|
|
else {
|
|
char *cp;
|
|
int left, n;
|
|
|
|
if (fcc <= 0)
|
|
break;
|
|
fbp = fibuf;
|
|
|
|
top:
|
|
for (cp = fibuf; cp < fibuf+fcc-1; cp++)
|
|
if (cp[0] == magic[0] &&
|
|
cp[1] == magic[1]) {
|
|
left = fcc - (cp-fibuf);
|
|
n = control(p, cp, left);
|
|
if (n) {
|
|
left -= n;
|
|
if (left > 0)
|
|
memmove(cp,
|
|
cp+n,
|
|
left);
|
|
fcc -= n;
|
|
goto top; /* n^2 */
|
|
}
|
|
}
|
|
FD_SET(p, &obits); /* try write */
|
|
}
|
|
}
|
|
|
|
if (FD_ISSET(p, &obits) && fcc > 0) {
|
|
cc = write(p, fbp, fcc);
|
|
if (cc > 0) {
|
|
fcc -= cc;
|
|
fbp += cc;
|
|
}
|
|
}
|
|
|
|
if (FD_ISSET(p, &ibits)) {
|
|
pcc = read(p, pibuf, sizeof (pibuf));
|
|
pbp = pibuf;
|
|
if (pcc < 0 && errno == EWOULDBLOCK)
|
|
pcc = 0;
|
|
else if (pcc <= 0)
|
|
break;
|
|
else if (pibuf[0] == 0) {
|
|
pbp++, pcc--;
|
|
FD_SET(f, &obits); /* try write */
|
|
} else {
|
|
if (pkcontrol(pibuf[0])) {
|
|
pibuf[0] |= oobdata[0];
|
|
send(f, &pibuf[0], 1, MSG_OOB);
|
|
}
|
|
pcc = 0;
|
|
}
|
|
}
|
|
if ((FD_ISSET(f, &obits)) && pcc > 0) {
|
|
cc = write(f, pbp, pcc);
|
|
if (cc < 0 && errno == EWOULDBLOCK) {
|
|
/*
|
|
* This happens when we try write after read
|
|
* from p, but some old kernels balk at large
|
|
* writes even when select returns true.
|
|
*/
|
|
if (!FD_ISSET(p, &ibits))
|
|
sleep(5);
|
|
continue;
|
|
}
|
|
if (cc > 0) {
|
|
pcc -= cc;
|
|
pbp += cc;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
cleanup(signo)
|
|
int signo;
|
|
{
|
|
char *p, c;
|
|
|
|
p = line + sizeof(_PATH_DEV) - 1;
|
|
if (logout(p))
|
|
logwtmp(p, "", "");
|
|
(void)chmod(line, 0666);
|
|
(void)chown(line, 0, 0);
|
|
c = *p; *p = 'p';
|
|
(void)chmod(line, 0666);
|
|
(void)chown(line, 0, 0);
|
|
*p = c;
|
|
if (ttyaction(line, "rlogind", "root"))
|
|
syslog(LOG_ERR, "%s: ttyaction failed", line);
|
|
shutdown(netf, 2);
|
|
exit(1);
|
|
}
|
|
|
|
void
|
|
fatal(f, msg, syserr)
|
|
int f;
|
|
char *msg;
|
|
int syserr;
|
|
{
|
|
int len;
|
|
char buf[BUFSIZ], *bp = buf;
|
|
|
|
/*
|
|
* Prepend binary one to message if we haven't sent
|
|
* the magic null as confirmation.
|
|
*/
|
|
if (!confirmed)
|
|
*bp++ = '\01'; /* error indicator */
|
|
if (syserr)
|
|
len = sprintf(bp, "rlogind: %s: %s.\r\n",
|
|
msg, strerror(errno));
|
|
else
|
|
len = sprintf(bp, "rlogind: %s.\r\n", msg);
|
|
(void) write(f, buf, bp + len - buf);
|
|
exit(1);
|
|
}
|
|
|
|
int
|
|
do_rlogin(dest, host)
|
|
struct sockaddr *dest;
|
|
char *host;
|
|
{
|
|
int retval;
|
|
|
|
getstr(rusername, sizeof(rusername), "remuser too long");
|
|
getstr(lusername, sizeof(lusername), "locuser too long");
|
|
getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long");
|
|
|
|
pwd = getpwnam(lusername);
|
|
if (pwd == NULL) {
|
|
syslog(LOG_INFO,
|
|
"%s@%s as %s: unknown login.", rusername, host, lusername);
|
|
return (-1);
|
|
}
|
|
|
|
retval = iruserok_sa(dest, dest->sa_len, pwd->pw_uid == 0, rusername,
|
|
lusername);
|
|
/* XXX put inet_ntoa(dest->sin_addr.s_addr) into all messages below */
|
|
if (retval == 0) {
|
|
if (log_success)
|
|
syslog(LOG_INFO, "%s@%s as %s: iruserok succeeded",
|
|
rusername, host, lusername);
|
|
} else {
|
|
if (__rcmd_errstr)
|
|
syslog(LOG_INFO, "%s@%s as %s: iruserok failed (%s)",
|
|
rusername, host, lusername, __rcmd_errstr);
|
|
else
|
|
syslog(LOG_INFO, "%s@%s as %s: iruserok failed",
|
|
rusername, host, lusername);
|
|
}
|
|
return(retval);
|
|
}
|
|
|
|
void
|
|
getstr(buf, cnt, errmsg)
|
|
char *buf;
|
|
int cnt;
|
|
char *errmsg;
|
|
{
|
|
char c;
|
|
|
|
do {
|
|
if (read(0, &c, 1) != 1)
|
|
exit(1);
|
|
if (--cnt < 0)
|
|
fatal(STDOUT_FILENO, errmsg, 0);
|
|
*buf++ = c;
|
|
} while (c != 0);
|
|
}
|
|
|
|
|
|
void
|
|
setup_term(fd)
|
|
int fd;
|
|
{
|
|
char *cp = index(term+ENVSIZE, '/');
|
|
char *speed;
|
|
struct termios tt;
|
|
|
|
#ifndef notyet
|
|
tcgetattr(fd, &tt);
|
|
if (cp) {
|
|
*cp++ = '\0';
|
|
speed = cp;
|
|
cp = index(speed, '/');
|
|
if (cp)
|
|
*cp++ = '\0';
|
|
cfsetspeed(&tt, atoi(speed));
|
|
}
|
|
|
|
tt.c_iflag = TTYDEF_IFLAG;
|
|
tt.c_oflag = TTYDEF_OFLAG;
|
|
tt.c_lflag = TTYDEF_LFLAG;
|
|
tcsetattr(fd, TCSAFLUSH, &tt);
|
|
#else
|
|
if (cp) {
|
|
*cp++ = '\0';
|
|
speed = cp;
|
|
cp = index(speed, '/');
|
|
if (cp)
|
|
*cp++ = '\0';
|
|
tcgetattr(fd, &tt);
|
|
cfsetspeed(&tt, atoi(speed));
|
|
tcsetattr(fd, TCSAFLUSH, &tt);
|
|
}
|
|
#endif
|
|
|
|
env[0] = term;
|
|
env[1] = 0;
|
|
environ = env;
|
|
}
|
|
|
|
|
|
void
|
|
usage()
|
|
{
|
|
syslog(LOG_ERR, "usage: rlogind [-alnL]");
|
|
}
|
|
|
|
/*
|
|
* Check whether host h is in our local domain,
|
|
* defined as sharing the last two components of the domain part,
|
|
* or the entire domain part if the local domain has only one component.
|
|
* If either name is unqualified (contains no '.'),
|
|
* assume that the host is local, as it will be
|
|
* interpreted as such.
|
|
*/
|
|
int
|
|
local_domain(h)
|
|
char *h;
|
|
{
|
|
char localhost[MAXHOSTNAMELEN + 1];
|
|
char *p1, *p2;
|
|
|
|
localhost[0] = 0;
|
|
(void) gethostname(localhost, sizeof(localhost));
|
|
localhost[sizeof(localhost) - 1] = '\0';
|
|
p1 = topdomain(localhost);
|
|
p2 = topdomain(h);
|
|
if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2))
|
|
return (1);
|
|
return (0);
|
|
}
|
|
|
|
char *
|
|
topdomain(h)
|
|
char *h;
|
|
{
|
|
char *p;
|
|
char *maybe = NULL;
|
|
int dots = 0;
|
|
|
|
for (p = h + strlen(h); p >= h; p--) {
|
|
if (*p == '.') {
|
|
if (++dots == 2)
|
|
return (p);
|
|
maybe = p;
|
|
}
|
|
}
|
|
return (maybe);
|
|
}
|