rlogind.c revision 216584
11592Srgrimes/*- 21592Srgrimes * Copyright (c) 1983, 1988, 1989, 1993 31592Srgrimes * The Regents of the University of California. All rights reserved. 496196Sdes * Copyright (c) 2002 Networks Associates Technology, Inc. 596196Sdes * All rights reserved. 61592Srgrimes * 796196Sdes * Portions of this software were developed for the FreeBSD Project by 896196Sdes * ThinkSec AS and NAI Labs, the Security Research Division of Network 996196Sdes * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 1096196Sdes * ("CBOSS"), as part of the DARPA CHATS research program. 1196196Sdes * 121592Srgrimes * Redistribution and use in source and binary forms, with or without 131592Srgrimes * modification, are permitted provided that the following conditions 141592Srgrimes * are met: 151592Srgrimes * 1. Redistributions of source code must retain the above copyright 161592Srgrimes * notice, this list of conditions and the following disclaimer. 171592Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 181592Srgrimes * notice, this list of conditions and the following disclaimer in the 191592Srgrimes * documentation and/or other materials provided with the distribution. 201592Srgrimes * 3. All advertising materials mentioning features or use of this software 211592Srgrimes * must display the following acknowledgement: 221592Srgrimes * This product includes software developed by the University of 231592Srgrimes * California, Berkeley and its contributors. 241592Srgrimes * 4. Neither the name of the University nor the names of its contributors 251592Srgrimes * may be used to endorse or promote products derived from this software 261592Srgrimes * without specific prior written permission. 271592Srgrimes * 281592Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 291592Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 301592Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 311592Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 321592Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 331592Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 341592Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 351592Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 361592Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 371592Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 381592Srgrimes * SUCH DAMAGE. 391592Srgrimes */ 401592Srgrimes 41114624Sobrien#if 0 421592Srgrimes#ifndef lint 4329916Smarkmstatic const char copyright[] = 441592Srgrimes"@(#) Copyright (c) 1983, 1988, 1989, 1993\n\ 451592Srgrimes The Regents of the University of California. All rights reserved.\n"; 461592Srgrimes#endif /* not lint */ 471592Srgrimes 481592Srgrimes#ifndef lint 4929916Smarkmstatic const char sccsid[] = "@(#)rlogind.c 8.1 (Berkeley) 6/4/93"; 50114624Sobrien#endif /* not lint */ 5131405Scharnier#endif 52114624Sobrien#include <sys/cdefs.h> 53114624Sobrien__FBSDID("$FreeBSD: head/libexec/rlogind/rlogind.c 216584 2010-12-20 08:44:08Z charnier $"); 541592Srgrimes 551592Srgrimes/* 561592Srgrimes * remote login server: 571592Srgrimes * \0 581592Srgrimes * remuser\0 591592Srgrimes * locuser\0 601592Srgrimes * terminal_type/speed\0 611592Srgrimes * data 621592Srgrimes */ 631592Srgrimes 641592Srgrimes#define FD_SETSIZE 16 /* don't need many bits for select */ 6529916Smarkm#include <sys/types.h> 661592Srgrimes#include <sys/param.h> 671592Srgrimes#include <sys/stat.h> 681592Srgrimes#include <sys/ioctl.h> 691592Srgrimes#include <signal.h> 701592Srgrimes#include <termios.h> 711592Srgrimes 721592Srgrimes#include <sys/socket.h> 731592Srgrimes#include <netinet/in.h> 741592Srgrimes#include <netinet/in_systm.h> 751592Srgrimes#include <netinet/ip.h> 7611486Sdg#include <netinet/tcp.h> 771592Srgrimes#include <arpa/inet.h> 781592Srgrimes#include <netdb.h> 791592Srgrimes 8031405Scharnier#include <errno.h> 8131405Scharnier#include <libutil.h> 8296196Sdes#include <paths.h> 831592Srgrimes#include <pwd.h> 841592Srgrimes#include <syslog.h> 851592Srgrimes#include <stdio.h> 861592Srgrimes#include <stdlib.h> 871592Srgrimes#include <string.h> 8831405Scharnier#include <unistd.h> 891592Srgrimes 9051433Smarkm 911592Srgrimes#ifndef TIOCPKT_WINDOW 921592Srgrimes#define TIOCPKT_WINDOW 0x80 931592Srgrimes#endif 941592Srgrimes 95141588Sru#define ARGSTR "Daln" 961592Srgrimes 971592Srgrimeschar *env[2]; 981592Srgrimes#define NMAX 30 991592Srgrimeschar lusername[NMAX+1], rusername[NMAX+1]; 1001592Srgrimesstatic char term[64] = "TERM="; 1011592Srgrimes#define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */ 1021592Srgrimesint keepalive = 1; 1031592Srgrimesint check_all = 0; 10411486Sdgint no_delay; 1051592Srgrimes 1061592Srgrimesstruct passwd *pwd; 1071592Srgrimes 10856590Sshinunion sockunion { 10956590Sshin struct sockinet { 11056590Sshin u_char si_len; 11156590Sshin u_char si_family; 11256590Sshin u_short si_port; 11356590Sshin } su_si; 11456590Sshin struct sockaddr_in su_sin; 11556590Sshin struct sockaddr_in6 su_sin6; 11656590Sshin}; 11756590Sshin#define su_len su_si.si_len 11856590Sshin#define su_family su_si.si_family 11956590Sshin#define su_port su_si.si_port 12056590Sshin 12190377Simpvoid doit(int, union sockunion *); 12290377Simpint control(int, char *, int); 12390377Simpvoid protocol(int, int); 12490377Simpvoid cleanup(int); 12590377Simpvoid fatal(int, char *, int); 12690377Simpint do_rlogin(union sockunion *); 12790377Simpvoid getstr(char *, int, char *); 12890377Simpvoid setup_term(int); 12990377Simpint do_krb_login(struct sockaddr_in *); 13090377Simpvoid usage(void); 1311592Srgrimes 13251433Smarkm 1331592Srgrimesint 13490377Simpmain(int argc, char *argv[]) 1351592Srgrimes{ 1361592Srgrimes extern int __check_rhosts_file; 13756590Sshin union sockunion from; 138141918Sstefanf socklen_t fromlen; 139141918Sstefanf int ch, on; 1401592Srgrimes 1411592Srgrimes openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH); 1421592Srgrimes 1431592Srgrimes opterr = 0; 14424349Simp while ((ch = getopt(argc, argv, ARGSTR)) != -1) 1451592Srgrimes switch (ch) { 14611486Sdg case 'D': 14711486Sdg no_delay = 1; 14811486Sdg break; 1491592Srgrimes case 'a': 1501592Srgrimes check_all = 1; 1511592Srgrimes break; 1521592Srgrimes case 'l': 1531592Srgrimes __check_rhosts_file = 0; 1541592Srgrimes break; 1551592Srgrimes case 'n': 1561592Srgrimes keepalive = 0; 1571592Srgrimes break; 1581592Srgrimes case '?': 1591592Srgrimes default: 1601592Srgrimes usage(); 1611592Srgrimes break; 1621592Srgrimes } 1631592Srgrimes argc -= optind; 1641592Srgrimes argv += optind; 1651592Srgrimes 1661592Srgrimes fromlen = sizeof (from); 1671592Srgrimes if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 1681592Srgrimes syslog(LOG_ERR,"Can't get peer name of remote host: %m"); 1691592Srgrimes fatal(STDERR_FILENO, "Can't get peer name of remote host", 1); 1701592Srgrimes } 1711592Srgrimes on = 1; 1721592Srgrimes if (keepalive && 1731592Srgrimes setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) 1741592Srgrimes syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 17511486Sdg if (no_delay && 17611486Sdg setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 17711486Sdg syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m"); 17896196Sdes if (from.su_family == AF_INET) 17956590Sshin { 1801592Srgrimes on = IPTOS_LOWDELAY; 1811592Srgrimes if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1821592Srgrimes syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 18356590Sshin } 18411486Sdg 1851592Srgrimes doit(0, &from); 18629916Smarkm return 0; 1871592Srgrimes} 1881592Srgrimes 1891592Srgrimesint child; 1901592Srgrimesint netf; 1911592Srgrimeschar line[MAXPATHLEN]; 1921592Srgrimesint confirmed; 1931592Srgrimes 1941592Srgrimesstruct winsize win = { 0, 0, 0, 0 }; 1951592Srgrimes 1961592Srgrimes 1971592Srgrimesvoid 19890377Simpdoit(int f, union sockunion *fromp) 1991592Srgrimes{ 2001592Srgrimes int master, pid, on = 1; 2011592Srgrimes int authenticated = 0; 20256590Sshin char hostname[2 * MAXHOSTNAMELEN + 1]; 20356590Sshin char nameinfo[2 * INET6_ADDRSTRLEN + 1]; 2041592Srgrimes char c; 2051592Srgrimes 2061592Srgrimes alarm(60); 2071592Srgrimes read(f, &c, 1); 2081592Srgrimes 2091592Srgrimes if (c != 0) 2101592Srgrimes exit(1); 2111592Srgrimes 2121592Srgrimes alarm(0); 21356590Sshin 21456590Sshin realhostname_sa(hostname, sizeof(hostname) - 1, 21556590Sshin (struct sockaddr *)fromp, fromp->su_len); 21656590Sshin /* error check ? */ 21756590Sshin fromp->su_port = ntohs((u_short)fromp->su_port); 21824191Simp hostname[sizeof(hostname) - 1] = '\0'; 2191592Srgrimes 2201592Srgrimes { 22163959Sume if ((fromp->su_family != AF_INET 22256590Sshin#ifdef INET6 22363959Sume && fromp->su_family != AF_INET6 22456590Sshin#endif 22556590Sshin ) || 22656590Sshin fromp->su_port >= IPPORT_RESERVED || 22756590Sshin fromp->su_port < IPPORT_RESERVED/2) { 22856590Sshin getnameinfo((struct sockaddr *)fromp, 22956590Sshin fromp->su_len, 23056590Sshin nameinfo, sizeof(nameinfo), NULL, 0, 231146187Sume NI_NUMERICHOST); 23256590Sshin /* error check ? */ 2331592Srgrimes syslog(LOG_NOTICE, "Connection from %s on illegal port", 23456590Sshin nameinfo); 2351592Srgrimes fatal(f, "Permission denied", 0); 2361592Srgrimes } 2371592Srgrimes#ifdef IP_OPTIONS 23856590Sshin if (fromp->su_family == AF_INET) 23996196Sdes { 24022455Simp u_char optbuf[BUFSIZ/3]; 241141918Sstefanf socklen_t optsize = sizeof(optbuf); 242141918Sstefanf int ipproto, i; 2431592Srgrimes struct protoent *ip; 2441592Srgrimes 2451592Srgrimes if ((ip = getprotobyname("ip")) != NULL) 2461592Srgrimes ipproto = ip->p_proto; 2471592Srgrimes else 2481592Srgrimes ipproto = IPPROTO_IP; 2491592Srgrimes if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf, 2501592Srgrimes &optsize) == 0 && optsize != 0) { 25122455Simp for (i = 0; i < optsize; ) { 25222455Simp u_char c = optbuf[i]; 25322455Simp if (c == IPOPT_LSRR || c == IPOPT_SSRR) { 25422455Simp syslog(LOG_NOTICE, 25522455Simp "Connection refused from %s with IP option %s", 25656590Sshin inet_ntoa(fromp->su_sin.sin_addr), 25722455Simp c == IPOPT_LSRR ? "LSRR" : "SSRR"); 25822455Simp exit(1); 25922455Simp } 26022455Simp if (c == IPOPT_EOL) 26122455Simp break; 26222455Simp i += (c == IPOPT_NOP) ? 1 : optbuf[i+1]; 2631592Srgrimes } 2641592Srgrimes } 26556590Sshin } 2661592Srgrimes#endif 2671592Srgrimes if (do_rlogin(fromp) == 0) 2681592Srgrimes authenticated++; 2691592Srgrimes } 2701592Srgrimes if (confirmed == 0) { 2711592Srgrimes write(f, "", 1); 2721592Srgrimes confirmed = 1; /* we sent the null! */ 2731592Srgrimes } 2741592Srgrimes netf = f; 2751592Srgrimes 2761592Srgrimes pid = forkpty(&master, line, NULL, &win); 2771592Srgrimes if (pid < 0) { 2781592Srgrimes if (errno == ENOENT) 2791592Srgrimes fatal(f, "Out of ptys", 0); 2801592Srgrimes else 2811592Srgrimes fatal(f, "Forkpty", 1); 2821592Srgrimes } 2831592Srgrimes if (pid == 0) { 2841592Srgrimes if (f > 2) /* f should always be 0, but... */ 2851592Srgrimes (void) close(f); 2861592Srgrimes setup_term(0); 28712575Snate if (*lusername=='-') { 2882076Sguido syslog(LOG_ERR, "tried to pass user \"%s\" to login", 2892076Sguido lusername); 2902076Sguido fatal(STDERR_FILENO, "invalid user", 0); 2912076Sguido } 2921592Srgrimes if (authenticated) { 2931592Srgrimes execl(_PATH_LOGIN, "login", "-p", 2941592Srgrimes "-h", hostname, "-f", lusername, (char *)NULL); 2951592Srgrimes } else 2961592Srgrimes execl(_PATH_LOGIN, "login", "-p", 2971592Srgrimes "-h", hostname, lusername, (char *)NULL); 2981592Srgrimes fatal(STDERR_FILENO, _PATH_LOGIN, 1); 2991592Srgrimes /*NOTREACHED*/ 3001592Srgrimes } 301141588Sru ioctl(f, FIONBIO, &on); 3021592Srgrimes ioctl(master, FIONBIO, &on); 3031592Srgrimes ioctl(master, TIOCPKT, &on); 3041592Srgrimes signal(SIGCHLD, cleanup); 3051592Srgrimes protocol(f, master); 3061592Srgrimes signal(SIGCHLD, SIG_IGN); 3071592Srgrimes cleanup(0); 3081592Srgrimes} 3091592Srgrimes 3101592Srgrimeschar magic[2] = { 0377, 0377 }; 3111592Srgrimeschar oobdata[] = {TIOCPKT_WINDOW}; 3121592Srgrimes 3131592Srgrimes/* 3141592Srgrimes * Handle a "control" request (signaled by magic being present) 3151592Srgrimes * in the data stream. For now, we are only willing to handle 3161592Srgrimes * window size changes. 3171592Srgrimes */ 3181592Srgrimesint 31990377Simpcontrol(int pty, char *cp, int n) 3201592Srgrimes{ 3211592Srgrimes struct winsize w; 3221592Srgrimes 323114624Sobrien if (n < 4 + (int)sizeof(w) || cp[2] != 's' || cp[3] != 's') 3241592Srgrimes return (0); 3251592Srgrimes oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */ 3261592Srgrimes bcopy(cp+4, (char *)&w, sizeof(w)); 3271592Srgrimes w.ws_row = ntohs(w.ws_row); 3281592Srgrimes w.ws_col = ntohs(w.ws_col); 3291592Srgrimes w.ws_xpixel = ntohs(w.ws_xpixel); 3301592Srgrimes w.ws_ypixel = ntohs(w.ws_ypixel); 3311592Srgrimes (void)ioctl(pty, TIOCSWINSZ, &w); 3321592Srgrimes return (4+sizeof (w)); 3331592Srgrimes} 3341592Srgrimes 3351592Srgrimes/* 3361592Srgrimes * rlogin "protocol" machine. 3371592Srgrimes */ 3381592Srgrimesvoid 33990377Simpprotocol(int f, int p) 3401592Srgrimes{ 34169705Sru char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL; 34246078Simp int pcc = 0, fcc = 0; 3431592Srgrimes int cc, nfd, n; 3441592Srgrimes char cntl; 3451592Srgrimes 3461592Srgrimes /* 3471592Srgrimes * Must ignore SIGTTOU, otherwise we'll stop 3481592Srgrimes * when we try and set slave pty's window shape 3491592Srgrimes * (our controlling tty is the master pty). 3501592Srgrimes */ 3511592Srgrimes (void) signal(SIGTTOU, SIG_IGN); 3521592Srgrimes send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */ 3531592Srgrimes if (f > p) 3541592Srgrimes nfd = f + 1; 3551592Srgrimes else 3561592Srgrimes nfd = p + 1; 3571592Srgrimes if (nfd > FD_SETSIZE) { 3581592Srgrimes syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE"); 3591592Srgrimes fatal(f, "internal error (select mask too small)", 0); 3601592Srgrimes } 3611592Srgrimes for (;;) { 3621592Srgrimes fd_set ibits, obits, ebits, *omask; 3631592Srgrimes 3641592Srgrimes FD_ZERO(&ebits); 3651592Srgrimes FD_ZERO(&ibits); 3661592Srgrimes FD_ZERO(&obits); 3671592Srgrimes omask = (fd_set *)NULL; 3681592Srgrimes if (fcc) { 3691592Srgrimes FD_SET(p, &obits); 3701592Srgrimes omask = &obits; 3711592Srgrimes } else 3721592Srgrimes FD_SET(f, &ibits); 37346078Simp if (pcc >= 0) { 3741592Srgrimes if (pcc) { 3751592Srgrimes FD_SET(f, &obits); 3761592Srgrimes omask = &obits; 3771592Srgrimes } else 3781592Srgrimes FD_SET(p, &ibits); 37946078Simp } 3801592Srgrimes FD_SET(p, &ebits); 3811592Srgrimes if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) { 3821592Srgrimes if (errno == EINTR) 3831592Srgrimes continue; 3841592Srgrimes fatal(f, "select", 1); 3851592Srgrimes } 3861592Srgrimes if (n == 0) { 3871592Srgrimes /* shouldn't happen... */ 3881592Srgrimes sleep(5); 3891592Srgrimes continue; 3901592Srgrimes } 3911592Srgrimes#define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP)) 3921592Srgrimes if (FD_ISSET(p, &ebits)) { 3931592Srgrimes cc = read(p, &cntl, 1); 3941592Srgrimes if (cc == 1 && pkcontrol(cntl)) { 3951592Srgrimes cntl |= oobdata[0]; 3961592Srgrimes send(f, &cntl, 1, MSG_OOB); 3971592Srgrimes if (cntl & TIOCPKT_FLUSHWRITE) { 3981592Srgrimes pcc = 0; 3991592Srgrimes FD_CLR(p, &ibits); 4001592Srgrimes } 4011592Srgrimes } 4021592Srgrimes } 4031592Srgrimes if (FD_ISSET(f, &ibits)) { 404141588Sru fcc = read(f, fibuf, sizeof(fibuf)); 4051592Srgrimes if (fcc < 0 && errno == EWOULDBLOCK) 4061592Srgrimes fcc = 0; 4071592Srgrimes else { 40890377Simp char *cp; 4091592Srgrimes int left, n; 4101592Srgrimes 4111592Srgrimes if (fcc <= 0) 4121592Srgrimes break; 4131592Srgrimes fbp = fibuf; 4141592Srgrimes 4151592Srgrimes top: 4161592Srgrimes for (cp = fibuf; cp < fibuf+fcc-1; cp++) 4171592Srgrimes if (cp[0] == magic[0] && 4181592Srgrimes cp[1] == magic[1]) { 4191592Srgrimes left = fcc - (cp-fibuf); 4201592Srgrimes n = control(p, cp, left); 4211592Srgrimes if (n) { 4221592Srgrimes left -= n; 4231592Srgrimes if (left > 0) 4241592Srgrimes bcopy(cp+n, cp, left); 4251592Srgrimes fcc -= n; 4261592Srgrimes goto top; /* n^2 */ 4271592Srgrimes } 4281592Srgrimes } 4291592Srgrimes FD_SET(p, &obits); /* try write */ 4301592Srgrimes } 4311592Srgrimes } 4321592Srgrimes 4331592Srgrimes if (FD_ISSET(p, &obits) && fcc > 0) { 4341592Srgrimes cc = write(p, fbp, fcc); 4351592Srgrimes if (cc > 0) { 4361592Srgrimes fcc -= cc; 4371592Srgrimes fbp += cc; 4381592Srgrimes } 4391592Srgrimes } 4401592Srgrimes 4411592Srgrimes if (FD_ISSET(p, &ibits)) { 4421592Srgrimes pcc = read(p, pibuf, sizeof (pibuf)); 4431592Srgrimes pbp = pibuf; 4441592Srgrimes if (pcc < 0 && errno == EWOULDBLOCK) 4451592Srgrimes pcc = 0; 4461592Srgrimes else if (pcc <= 0) 4471592Srgrimes break; 4481592Srgrimes else if (pibuf[0] == 0) { 4491592Srgrimes pbp++, pcc--; 450141588Sru FD_SET(f, &obits); /* try write */ 4511592Srgrimes } else { 4521592Srgrimes if (pkcontrol(pibuf[0])) { 4531592Srgrimes pibuf[0] |= oobdata[0]; 4541592Srgrimes send(f, &pibuf[0], 1, MSG_OOB); 4551592Srgrimes } 4561592Srgrimes pcc = 0; 4571592Srgrimes } 4581592Srgrimes } 4591592Srgrimes if ((FD_ISSET(f, &obits)) && pcc > 0) { 460141588Sru cc = write(f, pbp, pcc); 4611592Srgrimes if (cc < 0 && errno == EWOULDBLOCK) { 4621592Srgrimes /* 4631592Srgrimes * This happens when we try write after read 4641592Srgrimes * from p, but some old kernels balk at large 4651592Srgrimes * writes even when select returns true. 4661592Srgrimes */ 4671592Srgrimes if (!FD_ISSET(p, &ibits)) 4681592Srgrimes sleep(5); 4691592Srgrimes continue; 4701592Srgrimes } 4711592Srgrimes if (cc > 0) { 4721592Srgrimes pcc -= cc; 4731592Srgrimes pbp += cc; 4741592Srgrimes } 4751592Srgrimes } 4761592Srgrimes } 4771592Srgrimes} 4781592Srgrimes 4791592Srgrimesvoid 480216584Scharniercleanup(int signo __unused) 4811592Srgrimes{ 4821592Srgrimes 483146075Sjmallett shutdown(netf, SHUT_RDWR); 4841592Srgrimes exit(1); 4851592Srgrimes} 4861592Srgrimes 4871592Srgrimesvoid 48890377Simpfatal(int f, char *msg, int syserr) 4891592Srgrimes{ 4901592Srgrimes int len; 4911592Srgrimes char buf[BUFSIZ], *bp = buf; 4921592Srgrimes 4931592Srgrimes /* 4941592Srgrimes * Prepend binary one to message if we haven't sent 4951592Srgrimes * the magic null as confirmation. 4961592Srgrimes */ 4971592Srgrimes if (!confirmed) 4981592Srgrimes *bp++ = '\01'; /* error indicator */ 4991592Srgrimes if (syserr) 50064238Skris len = snprintf(bp, sizeof(buf), "rlogind: %s: %s.\r\n", 5011592Srgrimes msg, strerror(errno)); 5021592Srgrimes else 50364238Skris len = snprintf(bp, sizeof(buf), "rlogind: %s.\r\n", msg); 50481991Sbrian if (len < 0) 50581972Sbrian len = 0; 5061592Srgrimes (void) write(f, buf, bp + len - buf); 5071592Srgrimes exit(1); 5081592Srgrimes} 5091592Srgrimes 5101592Srgrimesint 51190377Simpdo_rlogin(union sockunion *dest) 5121592Srgrimes{ 51366755Sru 5141592Srgrimes getstr(rusername, sizeof(rusername), "remuser too long"); 5151592Srgrimes getstr(lusername, sizeof(lusername), "locuser too long"); 5161592Srgrimes getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long"); 5171592Srgrimes 5181592Srgrimes pwd = getpwnam(lusername); 5191592Srgrimes if (pwd == NULL) 5201592Srgrimes return (-1); 5211592Srgrimes /* XXX why don't we syslog() failure? */ 52256590Sshin 52356939Sshin return (iruserok_sa(dest, dest->su_len, pwd->pw_uid == 0, rusername, 52456939Sshin lusername)); 5251592Srgrimes} 5261592Srgrimes 5271592Srgrimesvoid 52890377Simpgetstr(char *buf, int cnt, char *errmsg) 5291592Srgrimes{ 5301592Srgrimes char c; 5311592Srgrimes 5321592Srgrimes do { 53380381Ssheldonh if (read(STDIN_FILENO, &c, 1) != 1) 5341592Srgrimes exit(1); 5351592Srgrimes if (--cnt < 0) 5361592Srgrimes fatal(STDOUT_FILENO, errmsg, 0); 5371592Srgrimes *buf++ = c; 5381592Srgrimes } while (c != 0); 5391592Srgrimes} 5401592Srgrimes 5411592Srgrimesextern char **environ; 5421592Srgrimes 5431592Srgrimesvoid 54490377Simpsetup_term(int fd) 5451592Srgrimes{ 54690377Simp char *cp = index(term+ENVSIZE, '/'); 5471592Srgrimes char *speed; 548214680Sed struct termios tt, def; 5491592Srgrimes 5501592Srgrimes#ifndef notyet 5511592Srgrimes tcgetattr(fd, &tt); 5521592Srgrimes if (cp) { 5531592Srgrimes *cp++ = '\0'; 5541592Srgrimes speed = cp; 5551592Srgrimes cp = index(speed, '/'); 5561592Srgrimes if (cp) 5571592Srgrimes *cp++ = '\0'; 5581592Srgrimes cfsetspeed(&tt, atoi(speed)); 5591592Srgrimes } 5601592Srgrimes 561214680Sed cfmakesane(&def); 562214680Sed tt.c_iflag = def.c_iflag; 563214680Sed tt.c_oflag = def.c_oflag; 564214680Sed tt.c_lflag = def.c_lflag; 5651592Srgrimes tcsetattr(fd, TCSAFLUSH, &tt); 5661592Srgrimes#else 5671592Srgrimes if (cp) { 5681592Srgrimes *cp++ = '\0'; 5691592Srgrimes speed = cp; 5701592Srgrimes cp = index(speed, '/'); 5711592Srgrimes if (cp) 5721592Srgrimes *cp++ = '\0'; 5731592Srgrimes tcgetattr(fd, &tt); 5741592Srgrimes cfsetspeed(&tt, atoi(speed)); 5751592Srgrimes tcsetattr(fd, TCSAFLUSH, &tt); 5761592Srgrimes } 5771592Srgrimes#endif 5781592Srgrimes 5791592Srgrimes env[0] = term; 5801592Srgrimes env[1] = 0; 5811592Srgrimes environ = env; 5821592Srgrimes} 5831592Srgrimes 5841592Srgrimesvoid 58590377Simpusage(void) 5861592Srgrimes{ 58751433Smarkm syslog(LOG_ERR, "usage: rlogind [-" ARGSTR "]"); 5881592Srgrimes} 589