rlogind.c revision 1.26
1 /* $NetBSD: rlogind.c,v 1.26 2002/08/20 13:14:41 christos Exp $ */ 2 3 /* 4 * Copyright (C) 1998 WIDE Project. 5 * All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 3. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by WIDE Project and 18 * its contributors. 19 * 4. Neither the name of the project nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 35 36 /*- 37 * Copyright (c) 1983, 1988, 1989, 1993 38 * The Regents of the University of California. All rights reserved. 39 * 40 * Redistribution and use in source and binary forms, with or without 41 * modification, are permitted provided that the following conditions 42 * are met: 43 * 1. Redistributions of source code must retain the above copyright 44 * notice, this list of conditions and the following disclaimer. 45 * 2. Redistributions in binary form must reproduce the above copyright 46 * notice, this list of conditions and the following disclaimer in the 47 * documentation and/or other materials provided with the distribution. 48 * 3. All advertising materials mentioning features or use of this software 49 * must display the following acknowledgement: 50 * This product includes software developed by the University of 51 * California, Berkeley and its contributors. 52 * 4. Neither the name of the University nor the names of its contributors 53 * may be used to endorse or promote products derived from this software 54 * without specific prior written permission. 55 * 56 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 57 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 58 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 59 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 60 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 61 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 62 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 63 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 64 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 65 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 66 * SUCH DAMAGE. 67 */ 68 69 #include <sys/cdefs.h> 70 #ifndef lint 71 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1989, 1993\n\ 72 The Regents of the University of California. All rights reserved.\n"); 73 #if 0 74 static char sccsid[] = "@(#)rlogind.c 8.2 (Berkeley) 4/28/95"; 75 #else 76 __RCSID("$NetBSD: rlogind.c,v 1.26 2002/08/20 13:14:41 christos Exp $"); 77 #endif 78 #endif /* not lint */ 79 80 /* 81 * remote login server: 82 * \0 83 * remuser\0 84 * locuser\0 85 * terminal_type/speed\0 86 * data 87 */ 88 89 #define FD_SETSIZE 16 /* don't need many bits for select */ 90 #include <sys/param.h> 91 #include <sys/stat.h> 92 #include <sys/ioctl.h> 93 #include <signal.h> 94 #include <termios.h> 95 96 #include <sys/socket.h> 97 #include <netinet/in.h> 98 #include <netinet/in_systm.h> 99 #include <netinet/ip.h> 100 #include <arpa/inet.h> 101 #include <netdb.h> 102 103 #include <pwd.h> 104 #include <syslog.h> 105 #include <errno.h> 106 #include <stdio.h> 107 #include <unistd.h> 108 #include <stdlib.h> 109 #include <string.h> 110 #include <util.h> 111 #include "pathnames.h" 112 113 #ifndef TIOCPKT_WINDOW 114 #define TIOCPKT_WINDOW 0x80 115 #endif 116 117 #define OPTIONS "alnL" 118 119 char *env[2]; 120 #define NMAX 30 121 char lusername[NMAX+1], rusername[NMAX+1]; 122 static char term[64] = "TERM="; 123 #define ENVSIZE (sizeof("TERM=")-1) /* skip null for concatenation */ 124 int keepalive = 1; 125 int check_all = 0; 126 int log_success = 0; 127 128 struct passwd *pwd; 129 130 void doit __P((int, struct sockaddr *)); 131 int control __P((int, char *, int)); 132 void protocol __P((int, int)); 133 void cleanup __P((int)); 134 void fatal __P((int, char *, int)); 135 int do_rlogin __P((struct sockaddr *, char *)); 136 void getstr __P((char *, int, char *)); 137 void setup_term __P((int)); 138 #if 0 139 int do_krb_login __P((union sockunion *)); 140 #endif 141 void usage __P((void)); 142 int local_domain __P((char *)); 143 char *topdomain __P((char *)); 144 int main __P((int, char *[])); 145 146 extern int __check_rhosts_file; 147 extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c */ 148 extern char **environ; 149 150 int 151 main(argc, argv) 152 int argc; 153 char *argv[]; 154 { 155 struct sockaddr_storage from; 156 int ch, fromlen, on; 157 158 openlog("rlogind", LOG_PID, LOG_AUTH); 159 160 opterr = 0; 161 while ((ch = getopt(argc, argv, OPTIONS)) != -1) 162 switch (ch) { 163 case 'a': 164 check_all = 1; 165 break; 166 case 'l': 167 __check_rhosts_file = 0; 168 break; 169 case 'n': 170 keepalive = 0; 171 break; 172 case 'L': 173 log_success = 1; 174 break; 175 case '?': 176 default: 177 usage(); 178 break; 179 } 180 argc -= optind; 181 argv += optind; 182 183 fromlen = sizeof (from); /* xxx */ 184 if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 185 syslog(LOG_ERR,"Can't get peer name of remote host: %m"); 186 fatal(STDERR_FILENO, "Can't get peer name of remote host", 1); 187 } 188 #ifdef INET6 189 if (((struct sockaddr *)&from)->sa_family == AF_INET6 && 190 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr) && 191 sizeof(struct sockaddr_in) <= sizeof(from)) { 192 struct sockaddr_in sin; 193 struct sockaddr_in6 *sin6; 194 const int off = sizeof(struct sockaddr_in6) - 195 sizeof(struct sockaddr_in); 196 197 sin6 = (struct sockaddr_in6 *)&from; 198 memset(&sin, 0, sizeof(sin)); 199 sin.sin_family = AF_INET; 200 sin.sin_len = sizeof(struct sockaddr_in); 201 memcpy(&sin.sin_addr, &sin6->sin6_addr.s6_addr[off], 202 sizeof(sin.sin_addr)); 203 memcpy(&from, &sin, sizeof(sin)); 204 fromlen = sin.sin_len; 205 } 206 #else 207 if (((struct sockaddr *)&from)->sa_family == AF_INET6 && 208 IN6_IS_ADDR_V4MAPPED(&((struct sockaddr_in6 *)&from)->sin6_addr)) { 209 char hbuf[NI_MAXHOST]; 210 if (getnameinfo((struct sockaddr *)&from, fromlen, hbuf, 211 sizeof(hbuf), NULL, 0, NI_NUMERICHOST) != 0) { 212 strncpy(hbuf, "invalid", sizeof(hbuf)); 213 } 214 syslog(LOG_ERR, "malformed \"from\" address (v4 mapped, %s)\n", 215 hbuf); 216 exit(1); 217 } 218 #endif 219 on = 1; 220 if (keepalive && 221 setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) 222 syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 223 #if defined(IP_TOS) 224 if (((struct sockaddr *)&from)->sa_family == AF_INET) { 225 on = IPTOS_LOWDELAY; 226 if (setsockopt(0, IPPROTO_IP, IP_TOS, (char *)&on, sizeof(int)) < 0) 227 syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); 228 } 229 #endif 230 doit(0, (struct sockaddr *)&from); 231 /* NOTREACHED */ 232 #ifdef __GNUC__ 233 exit(0); 234 #endif 235 } 236 237 int child; 238 int netf; 239 char line[MAXPATHLEN]; 240 int confirmed; 241 242 struct winsize win = { 0, 0, 0, 0 }; 243 244 245 void 246 doit(f, fromp) 247 int f; 248 struct sockaddr *fromp; 249 { 250 int master, pid, on = 1; 251 int authenticated = 0; 252 char *hostname; 253 char hostnamebuf[2 * MAXHOSTNAMELEN + 1]; 254 char c; 255 char naddr[NI_MAXHOST]; 256 char saddr[NI_MAXHOST]; 257 char raddr[NI_MAXHOST]; 258 int af = fromp->sa_family; 259 u_int16_t *portp; 260 struct addrinfo hints, *res, *res0; 261 int gaierror; 262 #ifdef NI_WITHSCOPEID 263 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV | NI_WITHSCOPEID; 264 #else 265 const int niflags = NI_NUMERICHOST | NI_NUMERICSERV; 266 #endif 267 268 alarm(60); 269 read(f, &c, 1); 270 271 if (c != 0) 272 exit(1); 273 274 alarm(0); 275 switch (af) { 276 case AF_INET: 277 portp = &((struct sockaddr_in *)fromp)->sin_port; 278 break; 279 #ifdef INET6 280 case AF_INET6: 281 portp = &((struct sockaddr_in6 *)fromp)->sin6_port; 282 break; 283 #endif 284 default: 285 syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af); 286 exit(1); 287 } 288 if (getnameinfo((struct sockaddr *)fromp, fromp->sa_len, 289 naddr, sizeof(naddr), NULL, 0, niflags) != 0) { 290 syslog(LOG_ERR, "malformed \"from\" address (af %d)\n", af); 291 exit(1); 292 } 293 294 if (getnameinfo((struct sockaddr *)fromp, fromp->sa_len, 295 saddr, sizeof(saddr), NULL, 0, NI_NAMEREQD) == 0) { 296 /* 297 * If name returned by gethostbyaddr is in our domain, 298 * attempt to verify that we haven't been fooled by someone 299 * in a remote net; look up the name and check that this 300 * address corresponds to the name. 301 */ 302 hostname = saddr; 303 res0 = NULL; 304 if (check_all || local_domain(saddr)) { 305 strncpy(hostnamebuf, saddr, sizeof(hostnamebuf) - 1); 306 hostnamebuf[sizeof(hostnamebuf) - 1] = 0; 307 memset(&hints, 0, sizeof(hints)); 308 hints.ai_family = fromp->sa_family; 309 hints.ai_socktype = SOCK_STREAM; 310 hints.ai_flags = AI_CANONNAME; 311 gaierror = getaddrinfo(hostnamebuf, "0", &hints, &res0); 312 if (gaierror) { 313 syslog(LOG_NOTICE, 314 "Couldn't look up address for %s: %s", 315 hostnamebuf, gai_strerror(gaierror)); 316 hostname = naddr; 317 } else { 318 for (res = res0; res; res = res->ai_next) { 319 if (res->ai_family != fromp->sa_family) 320 continue; 321 if (res->ai_addrlen != fromp->sa_len) 322 continue; 323 if (getnameinfo(res->ai_addr, 324 res->ai_addrlen, 325 raddr, sizeof(raddr), NULL, 0, 326 niflags) == 0 327 && strcmp(naddr, raddr) == 0) { 328 hostname = res->ai_canonname 329 ? res->ai_canonname 330 : saddr; 331 break; 332 } 333 } 334 if (res == NULL) { 335 syslog(LOG_NOTICE, 336 "Host addr %s not listed for host %s", 337 naddr, res0->ai_canonname 338 ? res0->ai_canonname 339 : saddr); 340 hostname = naddr; 341 } 342 } 343 } 344 hostname = strncpy(hostnamebuf, hostname, 345 sizeof(hostnamebuf) - 1); 346 if (res0) 347 freeaddrinfo(res0); 348 } else 349 hostname = strncpy(hostnamebuf, naddr, 350 sizeof(hostnamebuf) - 1); 351 352 hostnamebuf[sizeof(hostnamebuf) - 1] = '\0'; 353 354 if (ntohs(*portp) >= IPPORT_RESERVED || 355 ntohs(*portp) < IPPORT_RESERVED/2) { 356 syslog(LOG_NOTICE, "Connection from %s on illegal port", 357 naddr); 358 fatal(f, "Permission denied", 0); 359 } 360 #ifdef IP_OPTIONS 361 if (fromp->sa_family == AF_INET) { 362 u_char optbuf[BUFSIZ/3], *cp; 363 char lbuf[BUFSIZ], *lp; 364 int optsize = sizeof(optbuf), ipproto; 365 struct protoent *ip; 366 367 if ((ip = getprotobyname("ip")) != NULL) 368 ipproto = ip->p_proto; 369 else 370 ipproto = IPPROTO_IP; 371 if (getsockopt(0, ipproto, IP_OPTIONS, (char *)optbuf, 372 &optsize) == 0 && optsize != 0) { 373 lp = lbuf; 374 for (cp = optbuf; optsize > 0; cp++, optsize--, lp += 3) 375 sprintf(lp, " %2.2x", *cp); 376 syslog(LOG_NOTICE, 377 "Connection received using IP options (ignored):%s", 378 lbuf); 379 if (setsockopt(0, ipproto, IP_OPTIONS, 380 (char *)NULL, optsize) != 0) { 381 syslog(LOG_ERR, 382 "setsockopt IP_OPTIONS NULL: %m"); 383 exit(1); 384 } 385 } 386 } 387 #endif 388 if (do_rlogin(fromp, hostname) == 0) 389 authenticated++; 390 if (confirmed == 0) { 391 write(f, "", 1); 392 confirmed = 1; /* we sent the null! */ 393 } 394 netf = f; 395 396 pid = forkpty(&master, line, NULL, &win); 397 if (pid < 0) { 398 if (errno == ENOENT) 399 fatal(f, "Out of ptys", 0); 400 else 401 fatal(f, "Forkpty", 1); 402 } 403 if (pid == 0) { 404 if (f > 2) /* f should always be 0, but... */ 405 (void) close(f); 406 setup_term(0); 407 if (authenticated) 408 execl(_PATH_LOGIN, "login", "-p", 409 "-h", hostname, "-f", "--", lusername, (char *)0); 410 else 411 execl(_PATH_LOGIN, "login", "-p", 412 "-h", hostname, "--", lusername, (char *)0); 413 fatal(STDERR_FILENO, _PATH_LOGIN, 1); 414 /*NOTREACHED*/ 415 } 416 ioctl(f, FIONBIO, &on); 417 ioctl(master, FIONBIO, &on); 418 ioctl(master, TIOCPKT, &on); 419 signal(SIGCHLD, cleanup); 420 protocol(f, master); 421 signal(SIGCHLD, SIG_IGN); 422 cleanup(0); 423 } 424 425 char magic[2] = { 0377, 0377 }; 426 char oobdata[] = {TIOCPKT_WINDOW}; 427 428 /* 429 * Handle a "control" request (signaled by magic being present) 430 * in the data stream. For now, we are only willing to handle 431 * window size changes. 432 */ 433 int 434 control(pty, cp, n) 435 int pty; 436 char *cp; 437 int n; 438 { 439 struct winsize w; 440 441 if (n < 4+sizeof (w) || cp[2] != 's' || cp[3] != 's') 442 return (0); 443 oobdata[0] &= ~TIOCPKT_WINDOW; /* we know he heard */ 444 memmove(&w, cp+4, sizeof(w)); 445 w.ws_row = ntohs(w.ws_row); 446 w.ws_col = ntohs(w.ws_col); 447 w.ws_xpixel = ntohs(w.ws_xpixel); 448 w.ws_ypixel = ntohs(w.ws_ypixel); 449 (void)ioctl(pty, TIOCSWINSZ, &w); 450 return (4+sizeof (w)); 451 } 452 453 /* 454 * rlogin "protocol" machine. 455 */ 456 void 457 protocol(f, p) 458 int f, p; 459 { 460 char pibuf[1024+1], fibuf[1024], *pbp = NULL, *fbp = NULL; 461 /* XXX gcc above */ 462 int pcc = 0, fcc = 0; 463 int cc, nfd, n; 464 char cntl; 465 466 /* 467 * Must ignore SIGTTOU, otherwise we'll stop 468 * when we try and set slave pty's window shape 469 * (our controlling tty is the master pty). 470 */ 471 (void) signal(SIGTTOU, SIG_IGN); 472 send(f, oobdata, 1, MSG_OOB); /* indicate new rlogin */ 473 if (f > p) 474 nfd = f + 1; 475 else 476 nfd = p + 1; 477 if (nfd > FD_SETSIZE) { 478 syslog(LOG_ERR, "select mask too small, increase FD_SETSIZE"); 479 fatal(f, "internal error (select mask too small)", 0); 480 } 481 for (;;) { 482 fd_set ibits, obits, ebits, *omask; 483 484 FD_ZERO(&ebits); 485 FD_ZERO(&ibits); 486 FD_ZERO(&obits); 487 omask = (fd_set *)NULL; 488 if (fcc) { 489 FD_SET(p, &obits); 490 omask = &obits; 491 } else 492 FD_SET(f, &ibits); 493 if (pcc >= 0) { 494 if (pcc) { 495 FD_SET(f, &obits); 496 omask = &obits; 497 } else 498 FD_SET(p, &ibits); 499 } 500 FD_SET(p, &ebits); 501 if ((n = select(nfd, &ibits, omask, &ebits, 0)) < 0) { 502 if (errno == EINTR) 503 continue; 504 fatal(f, "select", 1); 505 } 506 if (n == 0) { 507 /* shouldn't happen... */ 508 sleep(5); 509 continue; 510 } 511 #define pkcontrol(c) ((c)&(TIOCPKT_FLUSHWRITE|TIOCPKT_NOSTOP|TIOCPKT_DOSTOP)) 512 if (FD_ISSET(p, &ebits)) { 513 cc = read(p, &cntl, 1); 514 if (cc == 1 && pkcontrol(cntl)) { 515 cntl |= oobdata[0]; 516 send(f, &cntl, 1, MSG_OOB); 517 if (cntl & TIOCPKT_FLUSHWRITE) { 518 pcc = 0; 519 FD_CLR(p, &ibits); 520 } 521 } 522 } 523 if (FD_ISSET(f, &ibits)) { 524 fcc = read(f, fibuf, sizeof(fibuf)); 525 if (fcc < 0 && errno == EWOULDBLOCK) 526 fcc = 0; 527 else { 528 char *cp; 529 int left, n; 530 531 if (fcc <= 0) 532 break; 533 fbp = fibuf; 534 535 top: 536 for (cp = fibuf; cp < fibuf+fcc-1; cp++) 537 if (cp[0] == magic[0] && 538 cp[1] == magic[1]) { 539 left = fcc - (cp-fibuf); 540 n = control(p, cp, left); 541 if (n) { 542 left -= n; 543 if (left > 0) 544 memmove(cp, 545 cp+n, 546 left); 547 fcc -= n; 548 goto top; /* n^2 */ 549 } 550 } 551 FD_SET(p, &obits); /* try write */ 552 } 553 } 554 555 if (FD_ISSET(p, &obits) && fcc > 0) { 556 cc = write(p, fbp, fcc); 557 if (cc > 0) { 558 fcc -= cc; 559 fbp += cc; 560 } 561 } 562 563 if (FD_ISSET(p, &ibits)) { 564 pcc = read(p, pibuf, sizeof (pibuf)); 565 pbp = pibuf; 566 if (pcc < 0 && errno == EWOULDBLOCK) 567 pcc = 0; 568 else if (pcc <= 0) 569 break; 570 else if (pibuf[0] == 0) { 571 pbp++, pcc--; 572 FD_SET(f, &obits); /* try write */ 573 } else { 574 if (pkcontrol(pibuf[0])) { 575 pibuf[0] |= oobdata[0]; 576 send(f, &pibuf[0], 1, MSG_OOB); 577 } 578 pcc = 0; 579 } 580 } 581 if ((FD_ISSET(f, &obits)) && pcc > 0) { 582 cc = write(f, pbp, pcc); 583 if (cc < 0 && errno == EWOULDBLOCK) { 584 /* 585 * This happens when we try write after read 586 * from p, but some old kernels balk at large 587 * writes even when select returns true. 588 */ 589 if (!FD_ISSET(p, &ibits)) 590 sleep(5); 591 continue; 592 } 593 if (cc > 0) { 594 pcc -= cc; 595 pbp += cc; 596 } 597 } 598 } 599 } 600 601 void 602 cleanup(signo) 603 int signo; 604 { 605 char *p, c; 606 607 p = line + sizeof(_PATH_DEV) - 1; 608 #ifdef SUPPORT_UTMP 609 if (logout(p)) 610 logwtmp(p, "", ""); 611 #endif 612 #ifdef SUPPORT_UTMPX 613 if (logoutx(p, 0, DEAD_PROCESS)) 614 logwtmpx(p, "", "", 0, DEAD_PROCESS); 615 #endif 616 (void)chmod(line, 0666); 617 (void)chown(line, 0, 0); 618 c = *p; *p = 'p'; 619 (void)chmod(line, 0666); 620 (void)chown(line, 0, 0); 621 *p = c; 622 if (ttyaction(line, "rlogind", "root")) 623 syslog(LOG_ERR, "%s: ttyaction failed", line); 624 shutdown(netf, 2); 625 exit(1); 626 } 627 628 void 629 fatal(f, msg, syserr) 630 int f; 631 char *msg; 632 int syserr; 633 { 634 int len; 635 char buf[BUFSIZ], *bp = buf; 636 637 /* 638 * Prepend binary one to message if we haven't sent 639 * the magic null as confirmation. 640 */ 641 if (!confirmed) 642 *bp++ = '\01'; /* error indicator */ 643 if (syserr) 644 len = sprintf(bp, "rlogind: %s: %s.\r\n", 645 msg, strerror(errno)); 646 else 647 len = sprintf(bp, "rlogind: %s.\r\n", msg); 648 (void) write(f, buf, bp + len - buf); 649 exit(1); 650 } 651 652 int 653 do_rlogin(dest, host) 654 struct sockaddr *dest; 655 char *host; 656 { 657 int retval; 658 659 getstr(rusername, sizeof(rusername), "remuser too long"); 660 getstr(lusername, sizeof(lusername), "locuser too long"); 661 getstr(term+ENVSIZE, sizeof(term)-ENVSIZE, "Terminal type too long"); 662 663 pwd = getpwnam(lusername); 664 if (pwd == NULL) { 665 syslog(LOG_INFO, 666 "%s@%s as %s: unknown login.", rusername, host, lusername); 667 return (-1); 668 } 669 670 retval = iruserok_sa(dest, dest->sa_len, pwd->pw_uid == 0, rusername, 671 lusername); 672 /* XXX put inet_ntoa(dest->sin_addr.s_addr) into all messages below */ 673 if (retval == 0) { 674 if (log_success) 675 syslog(LOG_INFO, "%s@%s as %s: iruserok succeeded", 676 rusername, host, lusername); 677 } else { 678 if (__rcmd_errstr) 679 syslog(LOG_INFO, "%s@%s as %s: iruserok failed (%s)", 680 rusername, host, lusername, __rcmd_errstr); 681 else 682 syslog(LOG_INFO, "%s@%s as %s: iruserok failed", 683 rusername, host, lusername); 684 } 685 return(retval); 686 } 687 688 void 689 getstr(buf, cnt, errmsg) 690 char *buf; 691 int cnt; 692 char *errmsg; 693 { 694 char c; 695 696 do { 697 if (read(0, &c, 1) != 1) 698 exit(1); 699 if (--cnt < 0) 700 fatal(STDOUT_FILENO, errmsg, 0); 701 *buf++ = c; 702 } while (c != 0); 703 } 704 705 706 void 707 setup_term(fd) 708 int fd; 709 { 710 char *cp = index(term+ENVSIZE, '/'); 711 char *speed; 712 struct termios tt; 713 714 #ifndef notyet 715 tcgetattr(fd, &tt); 716 if (cp) { 717 *cp++ = '\0'; 718 speed = cp; 719 cp = index(speed, '/'); 720 if (cp) 721 *cp++ = '\0'; 722 cfsetspeed(&tt, atoi(speed)); 723 } 724 725 tt.c_iflag = TTYDEF_IFLAG; 726 tt.c_oflag = TTYDEF_OFLAG; 727 tt.c_lflag = TTYDEF_LFLAG; 728 tcsetattr(fd, TCSAFLUSH, &tt); 729 #else 730 if (cp) { 731 *cp++ = '\0'; 732 speed = cp; 733 cp = index(speed, '/'); 734 if (cp) 735 *cp++ = '\0'; 736 tcgetattr(fd, &tt); 737 cfsetspeed(&tt, atoi(speed)); 738 tcsetattr(fd, TCSAFLUSH, &tt); 739 } 740 #endif 741 742 env[0] = term; 743 env[1] = 0; 744 environ = env; 745 } 746 747 748 void 749 usage() 750 { 751 syslog(LOG_ERR, "usage: rlogind [-alnL]"); 752 } 753 754 /* 755 * Check whether host h is in our local domain, 756 * defined as sharing the last two components of the domain part, 757 * or the entire domain part if the local domain has only one component. 758 * If either name is unqualified (contains no '.'), 759 * assume that the host is local, as it will be 760 * interpreted as such. 761 */ 762 int 763 local_domain(h) 764 char *h; 765 { 766 char localhost[MAXHOSTNAMELEN + 1]; 767 char *p1, *p2; 768 769 localhost[0] = 0; 770 (void) gethostname(localhost, sizeof(localhost)); 771 localhost[sizeof(localhost) - 1] = '\0'; 772 p1 = topdomain(localhost); 773 p2 = topdomain(h); 774 if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2)) 775 return (1); 776 return (0); 777 } 778 779 char * 780 topdomain(h) 781 char *h; 782 { 783 char *p; 784 char *maybe = NULL; 785 int dots = 0; 786 787 for (p = h + strlen(h); p >= h; p--) { 788 if (*p == '.') { 789 if (++dots == 2) 790 return (p); 791 maybe = p; 792 } 793 } 794 return (maybe); 795 } 796
Indexes created Tue Sep 23 07:09:52 GMT 2025