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. 20262136Sbrueffer * 3. Neither the name of the University nor the names of its contributors 211592Srgrimes * may be used to endorse or promote products derived from this software 221592Srgrimes * without specific prior written permission. 231592Srgrimes * 241592Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 251592Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 261592Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 271592Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 281592Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 291592Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 301592Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 311592Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 321592Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 331592Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 341592Srgrimes * SUCH DAMAGE. 351592Srgrimes */ 361592Srgrimes 37114624Sobrien#if 0 381592Srgrimes#ifndef lint 3929916Smarkmstatic const char copyright[] = 401592Srgrimes"@(#) Copyright (c) 1983, 1988, 1989, 1993\n\ 411592Srgrimes The Regents of the University of California. All rights reserved.\n"; 421592Srgrimes#endif /* not lint */ 431592Srgrimes 441592Srgrimes#ifndef lint 4529916Smarkmstatic const char sccsid[] = "@(#)rlogind.c 8.1 (Berkeley) 6/4/93"; 46114624Sobrien#endif /* not lint */ 4731405Scharnier#endif 48114624Sobrien#include <sys/cdefs.h> 49114624Sobrien__FBSDID("$FreeBSD$"); 501592Srgrimes 511592Srgrimes/* 521592Srgrimes * remote login server: 531592Srgrimes * \0 541592Srgrimes * remuser\0 551592Srgrimes * locuser\0 561592Srgrimes * terminal_type/speed\0 571592Srgrimes * data 581592Srgrimes */ 591592Srgrimes 601592Srgrimes#define FD_SETSIZE 16 /* don't need many bits for select */ 6129916Smarkm#include <sys/types.h> 621592Srgrimes#include <sys/param.h> 631592Srgrimes#include <sys/stat.h> 641592Srgrimes#include <sys/ioctl.h> 651592Srgrimes#include <signal.h> 661592Srgrimes#include <termios.h> 671592Srgrimes 681592Srgrimes#include <sys/socket.h> 691592Srgrimes#include <netinet/in.h> 701592Srgrimes#include <netinet/in_systm.h> 711592Srgrimes#include <netinet/ip.h> 7211486Sdg#include <netinet/tcp.h> 731592Srgrimes#include <arpa/inet.h> 741592Srgrimes#include <netdb.h> 751592Srgrimes 7631405Scharnier#include <errno.h> 7731405Scharnier#include <libutil.h> 7896196Sdes#include <paths.h> 79296109Spfg#include <poll.h> 801592Srgrimes#include <pwd.h> 811592Srgrimes#include <syslog.h> 821592Srgrimes#include <stdio.h> 831592Srgrimes#include <stdlib.h> 841592Srgrimes#include <string.h> 8531405Scharnier#include <unistd.h> 86301417Slidl#ifdef USE_BLACKLIST 87301417Slidl#include <blacklist.h> 88301417Slidl#endif 891592Srgrimes 901592Srgrimes#ifndef TIOCPKT_WINDOW 911592Srgrimes#define TIOCPKT_WINDOW 0x80 921592Srgrimes#endif 931592Srgrimes 94141588Sru#define ARGSTR "Daln" 951592Srgrimes 961592Srgrimeschar *env[2]; 971592Srgrimes#define NMAX 30 981592Srgrimeschar lusername[NMAX+1], rusername[NMAX+1]; 991592Srgrimesstatic char term[64] = "TERM="; 1001592Srgrimes#define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */ 1011592Srgrimesint keepalive = 1; 1021592Srgrimesint check_all = 0; 10311486Sdgint no_delay; 1041592Srgrimes 1051592Srgrimesstruct passwd *pwd; 1061592Srgrimes 10756590Sshinunion sockunion { 10856590Sshin struct sockinet { 10956590Sshin u_char si_len; 11056590Sshin u_char si_family; 11156590Sshin u_short si_port; 11256590Sshin } su_si; 11356590Sshin struct sockaddr_in su_sin; 11456590Sshin struct sockaddr_in6 su_sin6; 11556590Sshin}; 11656590Sshin#define su_len su_si.si_len 11756590Sshin#define su_family su_si.si_family 11856590Sshin#define su_port su_si.si_port 11956590Sshin 12090377Simpvoid doit(int, union sockunion *); 12190377Simpint control(int, char *, int); 12290377Simpvoid protocol(int, int); 12390377Simpvoid cleanup(int); 12490377Simpvoid fatal(int, char *, int); 12590377Simpint do_rlogin(union sockunion *); 12690377Simpvoid getstr(char *, int, char *); 12790377Simpvoid setup_term(int); 12890377Simpint do_krb_login(struct sockaddr_in *); 12990377Simpvoid usage(void); 1301592Srgrimes 13151433Smarkm 1321592Srgrimesint 13390377Simpmain(int argc, char *argv[]) 1341592Srgrimes{ 1351592Srgrimes extern int __check_rhosts_file; 13656590Sshin union sockunion from; 137141918Sstefanf socklen_t fromlen; 138141918Sstefanf int ch, on; 1391592Srgrimes 1401592Srgrimes openlog("rlogind", LOG_PID | LOG_CONS, LOG_AUTH); 1411592Srgrimes 1421592Srgrimes opterr = 0; 14324349Simp while ((ch = getopt(argc, argv, ARGSTR)) != -1) 1441592Srgrimes switch (ch) { 14511486Sdg case 'D': 14611486Sdg no_delay = 1; 14711486Sdg break; 1481592Srgrimes case 'a': 1491592Srgrimes check_all = 1; 1501592Srgrimes break; 1511592Srgrimes case 'l': 1521592Srgrimes __check_rhosts_file = 0; 1531592Srgrimes break; 1541592Srgrimes case 'n': 1551592Srgrimes keepalive = 0; 1561592Srgrimes break; 1571592Srgrimes case '?': 1581592Srgrimes default: 1591592Srgrimes usage(); 1601592Srgrimes break; 1611592Srgrimes } 1621592Srgrimes argc -= optind; 1631592Srgrimes argv += optind; 1641592Srgrimes 1651592Srgrimes fromlen = sizeof (from); 1661592Srgrimes if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 1671592Srgrimes syslog(LOG_ERR,"Can't get peer name of remote host: %m"); 1681592Srgrimes fatal(STDERR_FILENO, "Can't get peer name of remote host", 1); 1691592Srgrimes } 1701592Srgrimes on = 1; 1711592Srgrimes if (keepalive && 1721592Srgrimes setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) 1731592Srgrimes syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 17411486Sdg if (no_delay && 17511486Sdg setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 17611486Sdg syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m"); 17796196Sdes if (from.su_family == AF_INET) 17856590Sshin { 1791592Srgrimes on = IPTOS_LOWDELAY; 1801592Srgrimes if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 1811592Srgrimes syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 18256590Sshin } 18311486Sdg 1841592Srgrimes doit(0, &from); 18529916Smarkm return 0; 1861592Srgrimes} 1871592Srgrimes 1881592Srgrimesint child; 1891592Srgrimesint netf; 1901592Srgrimeschar line[MAXPATHLEN]; 1911592Srgrimesint confirmed; 1921592Srgrimes 1931592Srgrimesstruct winsize win = { 0, 0, 0, 0 }; 1941592Srgrimes 1951592Srgrimes 1961592Srgrimesvoid 19790377Simpdoit(int f, union sockunion *fromp) 1981592Srgrimes{ 1991592Srgrimes int master, pid, on = 1; 2001592Srgrimes int authenticated = 0; 20156590Sshin char hostname[2 * MAXHOSTNAMELEN + 1]; 20256590Sshin char nameinfo[2 * INET6_ADDRSTRLEN + 1]; 2031592Srgrimes char c; 2041592Srgrimes 2051592Srgrimes alarm(60); 2061592Srgrimes read(f, &c, 1); 2071592Srgrimes 2081592Srgrimes if (c != 0) 2091592Srgrimes exit(1); 2101592Srgrimes 2111592Srgrimes alarm(0); 21256590Sshin 21356590Sshin realhostname_sa(hostname, sizeof(hostname) - 1, 21456590Sshin (struct sockaddr *)fromp, fromp->su_len); 21556590Sshin /* error check ? */ 21656590Sshin fromp->su_port = ntohs((u_short)fromp->su_port); 21724191Simp hostname[sizeof(hostname) - 1] = '\0'; 2181592Srgrimes 2191592Srgrimes { 22063959Sume if ((fromp->su_family != AF_INET 22156590Sshin#ifdef INET6 22263959Sume && fromp->su_family != AF_INET6 22356590Sshin#endif 22456590Sshin ) || 22556590Sshin fromp->su_port >= IPPORT_RESERVED || 22656590Sshin fromp->su_port < IPPORT_RESERVED/2) { 22756590Sshin getnameinfo((struct sockaddr *)fromp, 22856590Sshin fromp->su_len, 22956590Sshin nameinfo, sizeof(nameinfo), NULL, 0, 230146187Sume NI_NUMERICHOST); 23156590Sshin /* error check ? */ 2321592Srgrimes syslog(LOG_NOTICE, "Connection from %s on illegal port", 23356590Sshin nameinfo); 234301417Slidl#ifdef USE_BLACKLIST 235301417Slidl blacklist(1, STDIN_FILENO, "illegal port"); 236301417Slidl#endif 2371592Srgrimes fatal(f, "Permission denied", 0); 2381592Srgrimes } 2391592Srgrimes#ifdef IP_OPTIONS 24056590Sshin if (fromp->su_family == AF_INET) 24196196Sdes { 24222455Simp u_char optbuf[BUFSIZ/3]; 243141918Sstefanf socklen_t optsize = sizeof(optbuf); 244141918Sstefanf int ipproto, i; 2451592Srgrimes struct protoent *ip; 2461592Srgrimes 2471592Srgrimes if ((ip = getprotobyname("ip")) != NULL) 2481592Srgrimes ipproto = ip->p_proto; 2491592Srgrimes else 2501592Srgrimes ipproto = IPPROTO_IP; 2511592Srgrimes if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf, 2521592Srgrimes &optsize) == 0 && optsize != 0) { 25322455Simp for (i = 0; i < optsize; ) { 25422455Simp u_char c = optbuf[i]; 25522455Simp if (c == IPOPT_LSRR || c == IPOPT_SSRR) { 25622455Simp syslog(LOG_NOTICE, 25722455Simp "Connection refused from %s with IP option %s", 25856590Sshin inet_ntoa(fromp->su_sin.sin_addr), 25922455Simp c == IPOPT_LSRR ? "LSRR" : "SSRR"); 260301417Slidl#ifdef USE_BLACKLIST 261301417Slidl blacklist(1, STDIN_FILENO, "source routing present"); 262301417Slidl#endif 26322455Simp exit(1); 26422455Simp } 26522455Simp if (c == IPOPT_EOL) 26622455Simp break; 26722455Simp i += (c == IPOPT_NOP) ? 1 : optbuf[i+1]; 2681592Srgrimes } 2691592Srgrimes } 27056590Sshin } 2711592Srgrimes#endif 2721592Srgrimes if (do_rlogin(fromp) == 0) 2731592Srgrimes authenticated++; 2741592Srgrimes } 2751592Srgrimes if (confirmed == 0) { 2761592Srgrimes write(f, "", 1); 2771592Srgrimes confirmed = 1; /* we sent the null! */ 2781592Srgrimes } 2791592Srgrimes netf = f; 2801592Srgrimes 2811592Srgrimes pid = forkpty(&master, line, NULL, &win); 2821592Srgrimes if (pid < 0) { 2831592Srgrimes if (errno == ENOENT) 2841592Srgrimes fatal(f, "Out of ptys", 0); 2851592Srgrimes else 2861592Srgrimes fatal(f, "Forkpty", 1); 2871592Srgrimes } 2881592Srgrimes if (pid == 0) { 2891592Srgrimes if (f > 2) /* f should always be 0, but... */ 2901592Srgrimes (void) close(f); 2911592Srgrimes setup_term(0); 292301417Slidl if (*lusername=='-') { 2932076Sguido syslog(LOG_ERR, "tried to pass user \"%s\" to login", 2942076Sguido lusername); 295301417Slidl#ifdef USE_BLACKLIST 296301417Slidl blacklist(1, STDIN_FILENO, "invalid user"); 297301417Slidl#endif 2982076Sguido fatal(STDERR_FILENO, "invalid user", 0); 2992076Sguido } 300301417Slidl#ifdef USE_BLACKLIST 301301417Slidl blacklist(0, STDIN_FILENO, "success"); 302301417Slidl#endif 3031592Srgrimes if (authenticated) { 3041592Srgrimes execl(_PATH_LOGIN, "login", "-p", 3051592Srgrimes "-h", hostname, "-f", lusername, (char *)NULL); 3061592Srgrimes } else 3071592Srgrimes execl(_PATH_LOGIN, "login", "-p", 3081592Srgrimes "-h", hostname, lusername, (char *)NULL); 3091592Srgrimes fatal(STDERR_FILENO, _PATH_LOGIN, 1); 3101592Srgrimes /*NOTREACHED*/ 3111592Srgrimes } 312141588Sru ioctl(f, FIONBIO, &on); 3131592Srgrimes ioctl(master, FIONBIO, &on); 3141592Srgrimes ioctl(master, TIOCPKT, &on); 3151592Srgrimes signal(SIGCHLD, cleanup); 3161592Srgrimes protocol(f, master); 3171592Srgrimes signal(SIGCHLD, SIG_IGN); 3181592Srgrimes cleanup(0); 3191592Srgrimes} 3201592Srgrimes 3211592Srgrimeschar magic[2] = { 0377, 0377 }; 3221592Srgrimeschar oobdata[] = {TIOCPKT_WINDOW}; 3231592Srgrimes 3241592Srgrimes/* 3251592Srgrimes * Handle a "control" request (signaled by magic being present) 3261592Srgrimes * in the data stream. For now, we are only willing to handle 3271592Srgrimes * window size changes. 3281592Srgrimes */ 3291592Srgrimesint 33090377Simpcontrol(int pty, char *cp, int n) 3311592Srgrimes{ 3321592Srgrimes struct winsize w; 3331592Srgrimes 334114624Sobrien if (n < 4 + (int)sizeof(w) || cp[2] != 's' || cp[3] != 's') 3351592Srgrimes return (0); 3361592Srgrimes oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */ 3371592Srgrimes bcopy(cp+4, (char *)&w, sizeof(w)); 3381592Srgrimes w.ws_row = ntohs(w.ws_row); 3391592Srgrimes w.ws_col = ntohs(w.ws_col); 3401592Srgrimes w.ws_xpixel = ntohs(w.ws_xpixel); 3411592Srgrimes w.ws_ypixel = ntohs(w.ws_ypixel); 3421592Srgrimes (void)ioctl(pty, TIOCSWINSZ, &w); 3431592Srgrimes return (4+sizeof (w)); 3441592Srgrimes} 3451592Srgrimes 3461592Srgrimes/* 3471592Srgrimes * rlogin "protocol" machine. 3481592Srgrimes */ 3491592Srgrimesvoid 35090377Simpprotocol(int f, int p) 3511592Srgrimes{ 35269705Sru char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL; 35346078Simp int pcc = 0, fcc = 0; 3541592Srgrimes int cc, nfd, n; 3551592Srgrimes char cntl; 3561592Srgrimes 3571592Srgrimes /* 3581592Srgrimes * Must ignore SIGTTOU, otherwise we'll stop 3591592Srgrimes * when we try and set slave pty's window shape 3601592Srgrimes * (our controlling tty is the master pty). 3611592Srgrimes */ 3621592Srgrimes (void) signal(SIGTTOU, SIG_IGN); 3631592Srgrimes send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */ 3641592Srgrimes if (f > p) 3651592Srgrimes nfd = f + 1; 3661592Srgrimes else 3671592Srgrimes nfd = p + 1; 3681592Srgrimes for (;;) { 369296109Spfg struct pollfd set[2]; 3701592Srgrimes 371296109Spfg set[0].fd = p; 372296109Spfg set[0].events = POLLPRI; 373296109Spfg set[1].fd = f; 374296109Spfg set[1].events = 0; 375296109Spfg if (fcc) 376296109Spfg set[0].events |= POLLOUT; 377296109Spfg else 378296109Spfg set[1].events |= POLLIN; 37946078Simp if (pcc >= 0) { 380296109Spfg if (pcc) 381296109Spfg set[1].events |= POLLOUT; 382296109Spfg else 383296109Spfg set[0].events |= POLLIN; 38446078Simp } 385296109Spfg if ((n = poll(set, 2, INFTIM)) < 0) { 3861592Srgrimes if (errno == EINTR) 3871592Srgrimes continue; 388296109Spfg fatal(f, "poll", 1); 3891592Srgrimes } 3901592Srgrimes if (n == 0) { 3911592Srgrimes /* shouldn't happen... */ 3921592Srgrimes sleep(5); 3931592Srgrimes continue; 3941592Srgrimes } 3951592Srgrimes#define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP)) 396296109Spfg if (set[0].revents & POLLPRI) { 3971592Srgrimes cc = read(p, &cntl, 1); 3981592Srgrimes if (cc == 1 && pkcontrol(cntl)) { 3991592Srgrimes cntl |= oobdata[0]; 4001592Srgrimes send(f, &cntl, 1, MSG_OOB); 401296109Spfg if (cntl & TIOCPKT_FLUSHWRITE) 4021592Srgrimes pcc = 0; 4031592Srgrimes } 4041592Srgrimes } 405296109Spfg if (set[1].revents & POLLIN) { 406141588Sru fcc = read(f, fibuf, sizeof(fibuf)); 4071592Srgrimes if (fcc < 0 && errno == EWOULDBLOCK) 4081592Srgrimes fcc = 0; 4091592Srgrimes else { 41090377Simp char *cp; 4111592Srgrimes int left, n; 4121592Srgrimes 4131592Srgrimes if (fcc <= 0) 4141592Srgrimes break; 4151592Srgrimes fbp = fibuf; 4161592Srgrimes 4171592Srgrimes top: 4181592Srgrimes for (cp = fibuf; cp < fibuf+fcc-1; cp++) 4191592Srgrimes if (cp[0] == magic[0] && 4201592Srgrimes cp[1] == magic[1]) { 4211592Srgrimes left = fcc - (cp-fibuf); 4221592Srgrimes n = control(p, cp, left); 4231592Srgrimes if (n) { 4241592Srgrimes left -= n; 4251592Srgrimes if (left > 0) 4261592Srgrimes bcopy(cp+n, cp, left); 4271592Srgrimes fcc -= n; 4281592Srgrimes goto top; /* n^2 */ 4291592Srgrimes } 4301592Srgrimes } 4311592Srgrimes } 4321592Srgrimes } 4331592Srgrimes 434296109Spfg if (set[0].revents & POLLOUT && fcc > 0) { 4351592Srgrimes cc = write(p, fbp, fcc); 4361592Srgrimes if (cc > 0) { 4371592Srgrimes fcc -= cc; 4381592Srgrimes fbp += cc; 4391592Srgrimes } 4401592Srgrimes } 4411592Srgrimes 442296109Spfg if (set[0].revents & POLLIN) { 4431592Srgrimes pcc = read(p, pibuf, sizeof (pibuf)); 4441592Srgrimes pbp = pibuf; 4451592Srgrimes if (pcc < 0 && errno == EWOULDBLOCK) 4461592Srgrimes pcc = 0; 4471592Srgrimes else if (pcc <= 0) 4481592Srgrimes break; 4491592Srgrimes else if (pibuf[0] == 0) { 4501592Srgrimes pbp++, pcc--; 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 } 459296109Spfg if (set[1].revents & POLLOUT && pcc > 0) { 460141588Sru cc = write(f, pbp, pcc); 4611592Srgrimes if (cc > 0) { 4621592Srgrimes pcc -= cc; 4631592Srgrimes pbp += cc; 4641592Srgrimes } 4651592Srgrimes } 4661592Srgrimes } 4671592Srgrimes} 4681592Srgrimes 4691592Srgrimesvoid 470216584Scharniercleanup(int signo __unused) 4711592Srgrimes{ 4721592Srgrimes 473146075Sjmallett shutdown(netf, SHUT_RDWR); 4741592Srgrimes exit(1); 4751592Srgrimes} 4761592Srgrimes 4771592Srgrimesvoid 47890377Simpfatal(int f, char *msg, int syserr) 4791592Srgrimes{ 4801592Srgrimes int len; 4811592Srgrimes char buf[BUFSIZ], *bp = buf; 4821592Srgrimes 4831592Srgrimes /* 4841592Srgrimes * Prepend binary one to message if we haven't sent 4851592Srgrimes * the magic null as confirmation. 4861592Srgrimes */ 4871592Srgrimes if (!confirmed) 4881592Srgrimes *bp++ = '\01'; /* error indicator */ 4891592Srgrimes if (syserr) 49064238Skris len = snprintf(bp, sizeof(buf), "rlogind: %s: %s.\r\n", 4911592Srgrimes msg, strerror(errno)); 4921592Srgrimes else 49364238Skris len = snprintf(bp, sizeof(buf), "rlogind: %s.\r\n", msg); 49481991Sbrian if (len < 0) 49581972Sbrian len = 0; 4961592Srgrimes (void) write(f, buf, bp + len - buf); 4971592Srgrimes exit(1); 4981592Srgrimes} 4991592Srgrimes 5001592Srgrimesint 50190377Simpdo_rlogin(union sockunion *dest) 5021592Srgrimes{ 50366755Sru 5041592Srgrimes getstr(rusername, sizeof(rusername), "remuser too long"); 5051592Srgrimes getstr(lusername, sizeof(lusername), "locuser too long"); 5061592Srgrimes getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long"); 5071592Srgrimes 5081592Srgrimes pwd = getpwnam(lusername); 5091592Srgrimes if (pwd == NULL) 5101592Srgrimes return (-1); 5111592Srgrimes /* XXX why don't we syslog() failure? */ 51256590Sshin 51356939Sshin return (iruserok_sa(dest, dest->su_len, pwd->pw_uid == 0, rusername, 51456939Sshin lusername)); 5151592Srgrimes} 5161592Srgrimes 5171592Srgrimesvoid 51890377Simpgetstr(char *buf, int cnt, char *errmsg) 5191592Srgrimes{ 5201592Srgrimes char c; 5211592Srgrimes 5221592Srgrimes do { 52380381Ssheldonh if (read(STDIN_FILENO, &c, 1) != 1) 5241592Srgrimes exit(1); 525301417Slidl if (--cnt < 0) { 526301417Slidl#ifdef USE_BLACKLIST 527301417Slidl blacklist(1, STDIN_FILENO, "buffer overflow"); 528301417Slidl#endif 5291592Srgrimes fatal(STDOUT_FILENO, errmsg, 0); 530301417Slidl } 5311592Srgrimes *buf++ = c; 5321592Srgrimes } while (c != 0); 5331592Srgrimes} 5341592Srgrimes 5351592Srgrimesextern char **environ; 5361592Srgrimes 5371592Srgrimesvoid 53890377Simpsetup_term(int fd) 5391592Srgrimes{ 540229403Sed char *cp; 5411592Srgrimes char *speed; 542214680Sed struct termios tt, def; 5431592Srgrimes 544229403Sed cp = strchr(term + ENVSIZE, '/'); 5451592Srgrimes#ifndef notyet 5461592Srgrimes tcgetattr(fd, &tt); 5471592Srgrimes if (cp) { 5481592Srgrimes *cp++ = '\0'; 5491592Srgrimes speed = cp; 550229403Sed cp = strchr(speed, '/'); 5511592Srgrimes if (cp) 5521592Srgrimes *cp++ = '\0'; 5531592Srgrimes cfsetspeed(&tt, atoi(speed)); 5541592Srgrimes } 5551592Srgrimes 556214680Sed cfmakesane(&def); 557214680Sed tt.c_iflag = def.c_iflag; 558214680Sed tt.c_oflag = def.c_oflag; 559214680Sed tt.c_lflag = def.c_lflag; 5601592Srgrimes tcsetattr(fd, TCSAFLUSH, &tt); 5611592Srgrimes#else 5621592Srgrimes if (cp) { 5631592Srgrimes *cp++ = '\0'; 5641592Srgrimes speed = cp; 565229403Sed cp = strchr(speed, '/'); 5661592Srgrimes if (cp) 5671592Srgrimes *cp++ = '\0'; 5681592Srgrimes tcgetattr(fd, &tt); 5691592Srgrimes cfsetspeed(&tt, atoi(speed)); 5701592Srgrimes tcsetattr(fd, TCSAFLUSH, &tt); 5711592Srgrimes } 5721592Srgrimes#endif 5731592Srgrimes 5741592Srgrimes env[0] = term; 5751592Srgrimes env[1] = 0; 5761592Srgrimes environ = env; 5771592Srgrimes} 5781592Srgrimes 5791592Srgrimesvoid 58090377Simpusage(void) 5811592Srgrimes{ 58251433Smarkm syslog(LOG_ERR, "usage: rlogind [-" ARGSTR "]"); 5831592Srgrimes} 584