rshd.c revision 146074
1218792Snp/*- 2237436Snp * Copyright (c) 1988, 1989, 1992, 1993, 1994 3218792Snp * The Regents of the University of California. All rights reserved. 4218792Snp * Copyright (c) 2002 Networks Associates Technology, Inc. 5218792Snp * All rights reserved. 6218792Snp * 7218792Snp * Portions of this software were developed for the FreeBSD Project by 8218792Snp * ThinkSec AS and NAI Labs, the Security Research Division of Network 9218792Snp * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 10218792Snp * ("CBOSS"), as part of the DARPA CHATS research program. 11218792Snp * 12218792Snp * Redistribution and use in source and binary forms, with or without 13218792Snp * modification, are permitted provided that the following conditions 14218792Snp * are met: 15218792Snp * 1. Redistributions of source code must retain the above copyright 16218792Snp * notice, this list of conditions and the following disclaimer. 17218792Snp * 2. Redistributions in binary form must reproduce the above copyright 18218792Snp * notice, this list of conditions and the following disclaimer in the 19218792Snp * documentation and/or other materials provided with the distribution. 20218792Snp * 3. All advertising materials mentioning features or use of this software 21218792Snp * must display the following acknowledgement: 22218792Snp * This product includes software developed by the University of 23218792Snp * California, Berkeley and its contributors. 24218792Snp * 4. Neither the name of the University nor the names of its contributors 25218792Snp * may be used to endorse or promote products derived from this software 26218792Snp * without specific prior written permission. 27218792Snp * 28218792Snp * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 29218792Snp * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 30237263Snp * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 31237263Snp * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 32218792Snp * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 33218792Snp * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 34218792Snp * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 35228561Snp * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 36218792Snp * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 37220649Snp * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 38246385Snp * SUCH DAMAGE. 39246385Snp */ 40246385Snp 41246385Snp#ifndef lint 42246385Snpstatic const char copyright[] = 43246385Snp"@(#) Copyright (c) 1988, 1989, 1992, 1993, 1994\n\ 44218792Snp The Regents of the University of California. All rights reserved.\n"; 45218792Snp#endif /* not lint */ 46218792Snp 47218792Snp#ifndef lint 48218792Snp#if 0 49218792Snpstatic const char sccsid[] = "@(#)rshd.c 8.2 (Berkeley) 4/6/94"; 50218792Snp#endif 51218792Snp#endif /* not lint */ 52218792Snp 53218792Snp#include <sys/cdefs.h> 54218792Snp__FBSDID("$FreeBSD: head/libexec/rshd/rshd.c 146074 2005-05-11 02:41:39Z jmallett $"); 55218792Snp 56218792Snp/* 57218792Snp * remote shell server: 58218792Snp * [port]\0 59218792Snp * ruser\0 60218792Snp * luser\0 61218792Snp * command\0 62218792Snp * data 63218792Snp */ 64218792Snp#include <sys/param.h> 65218792Snp#include <sys/ioctl.h> 66218792Snp#include <sys/time.h> 67218792Snp#include <sys/socket.h> 68218792Snp 69218792Snp#include <netinet/in_systm.h> 70218792Snp#include <netinet/in.h> 71218792Snp#include <netinet/ip.h> 72218792Snp#include <netinet/tcp.h> 73218792Snp#include <arpa/inet.h> 74218792Snp#include <netdb.h> 75218792Snp 76218792Snp#include <err.h> 77218792Snp#include <errno.h> 78218792Snp#include <fcntl.h> 79218792Snp#include <libutil.h> 80218792Snp#include <paths.h> 81218792Snp#include <pwd.h> 82218792Snp#include <signal.h> 83218792Snp#include <stdarg.h> 84218792Snp#include <stdio.h> 85218792Snp#include <stdlib.h> 86218792Snp#include <string.h> 87218792Snp#include <syslog.h> 88218792Snp#include <unistd.h> 89218792Snp#include <login_cap.h> 90218792Snp 91218792Snp#include <security/pam_appl.h> 92218792Snp#include <security/openpam.h> 93218792Snp#include <sys/wait.h> 94218792Snp 95218792Snpstatic struct pam_conv pamc = { openpam_nullconv, NULL }; 96218792Snpstatic pam_handle_t *pamh; 97218792Snpstatic int pam_err; 98218792Snp 99218792Snp#define PAM_END { \ 100218792Snp if ((pam_err = pam_setcred(pamh, PAM_DELETE_CRED)) != PAM_SUCCESS) \ 101218792Snp syslog(LOG_ERR|LOG_AUTH, "pam_setcred(): %s", pam_strerror(pamh, pam_err)); \ 102218792Snp if ((pam_err = pam_close_session(pamh,0)) != PAM_SUCCESS) \ 103218792Snp syslog(LOG_ERR|LOG_AUTH, "pam_close_session(): %s", pam_strerror(pamh, pam_err)); \ 104218792Snp if ((pam_err = pam_end(pamh, pam_err)) != PAM_SUCCESS) \ 105218792Snp syslog(LOG_ERR|LOG_AUTH, "pam_end(): %s", pam_strerror(pamh, pam_err)); \ 106218792Snp} 107218792Snp 108218792Snpint keepalive = 1; 109218792Snpint log_success; /* If TRUE, log all successful accesses */ 110218792Snpint sent_null; 111218792Snpint no_delay; 112218792Snp 113218792Snpvoid doit(struct sockaddr *); 114218792Snpstatic void rshd_errx(int, const char *, ...) __printf0like(2, 3); 115218792Snpvoid getstr(char *, int, const char *); 116218792Snpint local_domain(char *); 117218792Snpchar *topdomain(char *); 118218792Snpvoid usage(void); 119218792Snp 120218792Snpchar slash[] = "/"; 121218792Snpchar bshell[] = _PATH_BSHELL; 122218792Snp 123218792Snp#define OPTIONS "aDLln" 124218792Snp 125218792Snpint 126218792Snpmain(int argc, char *argv[]) 127218792Snp{ 128218792Snp extern int __check_rhosts_file; 129218792Snp struct linger linger; 130218792Snp socklen_t fromlen; 131218792Snp int ch, on = 1; 132218792Snp struct sockaddr_storage from; 133218792Snp 134218792Snp openlog("rshd", LOG_PID | LOG_ODELAY, LOG_DAEMON); 135218792Snp 136218792Snp opterr = 0; 137218792Snp while ((ch = getopt(argc, argv, OPTIONS)) != -1) 138218792Snp switch (ch) { 139218792Snp case 'a': 140218792Snp /* ignored for compatibility */ 141218792Snp break; 142218792Snp case 'l': 143237436Snp __check_rhosts_file = 0; 144237436Snp break; 145237436Snp case 'n': 146237436Snp keepalive = 0; 147237436Snp break; 148237436Snp case 'D': 149237436Snp no_delay = 1; 150237436Snp break; 151237436Snp case 'L': 152237436Snp log_success = 1; 153237436Snp break; 154237436Snp case '?': 155237436Snp default: 156237436Snp usage(); 157247355Snp break; 158247355Snp } 159247355Snp 160247355Snp argc -= optind; 161247355Snp argv += optind; 162247355Snp 163247355Snp fromlen = sizeof (from); 164247355Snp if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { 165247355Snp syslog(LOG_ERR, "getpeername: %m"); 166247355Snp exit(1); 167247355Snp } 168247355Snp if (keepalive && 169247355Snp setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, (char *)&on, 170247355Snp sizeof(on)) < 0) 171247355Snp syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); 172247355Snp linger.l_onoff = 1; 173247355Snp linger.l_linger = 60; /* XXX */ 174247355Snp if (setsockopt(0, SOL_SOCKET, SO_LINGER, (char *)&linger, 175247355Snp sizeof (linger)) < 0) 176247355Snp syslog(LOG_WARNING, "setsockopt (SO_LINGER): %m"); 177247355Snp if (no_delay && 178247355Snp setsockopt(0, IPPROTO_TCP, TCP_NODELAY, &on, sizeof(on)) < 0) 179250090Snp syslog(LOG_WARNING, "setsockopt (TCP_NODELAY): %m"); 180247355Snp doit((struct sockaddr *)&from); 181247355Snp /* NOTREACHED */ 182247355Snp return(0); 183247355Snp} 184247355Snp 185218792Snpextern char **environ; 186218792Snp 187218792Snpvoid 188218792Snpdoit(struct sockaddr *fromp) 189218792Snp{ 190218792Snp extern char *__rcmd_errstr; /* syslog hook from libc/net/rcmd.c. */ 191218792Snp struct passwd *pwd; 192218792Snp u_short port; 193218792Snp fd_set ready, readfrom; 194218792Snp int cc, fd, nfd, pv[2], pid, s; 195218792Snp int one = 1; 196218792Snp const char *cp, *errorstr; 197218792Snp char sig, buf[BUFSIZ]; 198218792Snp char *cmdbuf, luser[16], ruser[16]; 199218792Snp char rhost[2 * MAXHOSTNAMELEN + 1]; 200218792Snp char numericname[INET6_ADDRSTRLEN]; 201218792Snp int af, srcport; 202218792Snp int maxcmdlen; 203218792Snp login_cap_t *lc; 204218792Snp 205218792Snp maxcmdlen = (int)sysconf(_SC_ARG_MAX); 206218792Snp if (maxcmdlen <= 0 || (cmdbuf = malloc(maxcmdlen)) == NULL) 207218792Snp exit(1); 208218792Snp 209218792Snp (void) signal(SIGINT, SIG_DFL); 210218792Snp (void) signal(SIGQUIT, SIG_DFL); 211218792Snp (void) signal(SIGTERM, SIG_DFL); 212218792Snp af = fromp->sa_family; 213218792Snp srcport = ntohs(*((in_port_t *)&fromp->sa_data)); 214218792Snp if (af == AF_INET) { 215218792Snp inet_ntop(af, &((struct sockaddr_in *)fromp)->sin_addr, 216218792Snp numericname, sizeof numericname); 217218792Snp } else if (af == AF_INET6) { 218218792Snp inet_ntop(af, &((struct sockaddr_in6 *)fromp)->sin6_addr, 219218792Snp numericname, sizeof numericname); 220218792Snp } else { 221218792Snp syslog(LOG_ERR, "malformed \"from\" address (af %d)", af); 222218792Snp exit(1); 223218792Snp } 224218792Snp#ifdef IP_OPTIONS 225218792Snp if (af == AF_INET) { 226218792Snp u_char optbuf[BUFSIZ/3]; 227218792Snp socklen_t optsize = sizeof(optbuf), ipproto, i; 228218792Snp struct protoent *ip; 229218792Snp 230218792Snp if ((ip = getprotobyname("ip")) != NULL) 231218792Snp ipproto = ip->p_proto; 232218792Snp else 233218792Snp ipproto = IPPROTO_IP; 234218792Snp if (!getsockopt(0, ipproto, IP_OPTIONS, optbuf, &optsize) && 235218792Snp optsize != 0) { 236218792Snp for (i = 0; i < optsize; ) { 237218792Snp u_char c = optbuf[i]; 238218792Snp if (c == IPOPT_LSRR || c == IPOPT_SSRR) { 239228561Snp syslog(LOG_NOTICE, 240218792Snp "connection refused from %s with IP option %s", 241218792Snp numericname, 242218792Snp c == IPOPT_LSRR ? "LSRR" : "SSRR"); 243218792Snp exit(1); 244218792Snp } 245218792Snp if (c == IPOPT_EOL) 246218792Snp break; 247218792Snp i += (c == IPOPT_NOP) ? 1 : optbuf[i+1]; 248218792Snp } 249218792Snp } 250218792Snp } 251218792Snp#endif 252218792Snp 253218792Snp if (srcport >= IPPORT_RESERVED || 254218792Snp srcport < IPPORT_RESERVED/2) { 255218792Snp syslog(LOG_NOTICE|LOG_AUTH, 256218792Snp "connection from %s on illegal port %u", 257218792Snp numericname, 258218792Snp srcport); 259218792Snp exit(1); 260218792Snp } 261218792Snp 262286271Snp (void) alarm(60); 263286271Snp port = 0; 264218792Snp s = 0; /* not set or used if port == 0 */ 265218792Snp for (;;) { 266218792Snp char c; 267218792Snp if ((cc = read(STDIN_FILENO, &c, 1)) != 1) { 268218792Snp if (cc < 0) 269218792Snp syslog(LOG_NOTICE, "read: %m"); 270218792Snp shutdown(0, SHUT_RDWR); 271218792Snp exit(1); 272218792Snp } 273218792Snp if (c == 0) 274218792Snp break; 275218792Snp port = port * 10 + c - '0'; 276218792Snp } 277218792Snp 278218792Snp (void) alarm(0); 279218792Snp if (port != 0) { 280218792Snp int lport = IPPORT_RESERVED - 1; 281218792Snp s = rresvport_af(&lport, af); 282218792Snp if (s < 0) { 283218792Snp syslog(LOG_ERR, "can't get stderr port: %m"); 284218792Snp exit(1); 285218792Snp } 286218792Snp if (port >= IPPORT_RESERVED || 287218792Snp port < IPPORT_RESERVED/2) { 288218792Snp syslog(LOG_NOTICE|LOG_AUTH, 289286271Snp "2nd socket from %s on unreserved port %u", 290286271Snp numericname, 291218792Snp port); 292218792Snp exit(1); 293218792Snp } 294218792Snp *((in_port_t *)&fromp->sa_data) = htons(port); 295218792Snp if (connect(s, fromp, fromp->sa_len) < 0) { 296218792Snp syslog(LOG_INFO, "connect second port %d: %m", port); 297218792Snp exit(1); 298218792Snp } 299218792Snp } 300218792Snp 301218792Snp errorstr = NULL; 302247355Snp realhostname_sa(rhost, sizeof(rhost) - 1, fromp, fromp->sa_len); 303247355Snp rhost[sizeof(rhost) - 1] = '\0'; 304247355Snp /* XXX truncation! */ 305247355Snp 306247355Snp (void) alarm(60); 307218792Snp getstr(ruser, sizeof(ruser), "ruser"); 308218792Snp getstr(luser, sizeof(luser), "luser"); 309247355Snp getstr(cmdbuf, maxcmdlen, "command"); 310247355Snp (void) alarm(0); 311218792Snp 312218792Snp pam_err = pam_start("rsh", luser, &pamc, &pamh); 313218792Snp if (pam_err != PAM_SUCCESS) { 314218792Snp syslog(LOG_ERR|LOG_AUTH, "pam_start(): %s", 315218792Snp pam_strerror(pamh, pam_err)); 316218792Snp rshd_errx(1, "Login incorrect."); 317248925Snp } 318218792Snp 319218792Snp if ((pam_err = pam_set_item(pamh, PAM_RUSER, ruser)) != PAM_SUCCESS || 320218792Snp (pam_err = pam_set_item(pamh, PAM_RHOST, rhost) != PAM_SUCCESS)) { 321218792Snp syslog(LOG_ERR|LOG_AUTH, "pam_set_item(): %s", 322218792Snp pam_strerror(pamh, pam_err)); 323218792Snp rshd_errx(1, "Login incorrect."); 324218792Snp } 325218792Snp 326248925Snp pam_err = pam_authenticate(pamh, 0); 327218792Snp if (pam_err == PAM_SUCCESS) { 328218792Snp if ((pam_err = pam_get_user(pamh, &cp, NULL)) == PAM_SUCCESS) { 329248925Snp strncpy(luser, cp, sizeof(luser)); 330248925Snp luser[sizeof(luser) - 1] = '\0'; 331218792Snp /* XXX truncation! */ 332248925Snp } 333248925Snp pam_err = pam_acct_mgmt(pamh, 0); 334248925Snp } 335248925Snp if (pam_err != PAM_SUCCESS) { 336248925Snp syslog(LOG_INFO|LOG_AUTH, 337248925Snp "%s@%s as %s: permission denied (%s). cmd='%.80s'", 338248925Snp ruser, rhost, luser, pam_strerror(pamh, pam_err), cmdbuf); 339248925Snp rshd_errx(1, "Login incorrect."); 340248925Snp } 341248925Snp 342248925Snp setpwent(); 343248925Snp pwd = getpwnam(luser); 344248925Snp if (pwd == NULL) { 345248925Snp syslog(LOG_INFO|LOG_AUTH, 346248925Snp "%s@%s as %s: unknown login. cmd='%.80s'", 347248925Snp ruser, rhost, luser, cmdbuf); 348248925Snp if (errorstr == NULL) 349218792Snp errorstr = "Login incorrect."; 350248925Snp rshd_errx(1, errorstr, rhost); 351248925Snp } 352248925Snp 353248925Snp lc = login_getpwclass(pwd); 354248925Snp if (pwd->pw_uid) 355248925Snp auth_checknologin(lc); 356218792Snp 357218792Snp if (chdir(pwd->pw_dir) < 0) { 358218792Snp if (chdir("/") < 0 || 359248925Snp login_getcapbool(lc, "requirehome", !!pwd->pw_uid)) { 360218792Snp syslog(LOG_INFO|LOG_AUTH, 361218792Snp "%s@%s as %s: no home directory. cmd='%.80s'", 362237436Snp ruser, rhost, luser, cmdbuf); 363218792Snp rshd_errx(0, "No remote home directory."); 364218792Snp } 365218792Snp pwd->pw_dir = slash; 366218792Snp } 367218792Snp 368218792Snp if (lc != NULL && fromp->sa_family == AF_INET) { /*XXX*/ 369218792Snp char remote_ip[MAXHOSTNAMELEN]; 370218792Snp 371218792Snp strncpy(remote_ip, numericname, 372218792Snp sizeof(remote_ip) - 1); 373218792Snp remote_ip[sizeof(remote_ip) - 1] = 0; 374218792Snp /* XXX truncation! */ 375218792Snp if (!auth_hostok(lc, rhost, remote_ip)) { 376218792Snp syslog(LOG_INFO|LOG_AUTH, 377218792Snp "%s@%s as %s: permission denied (%s). cmd='%.80s'", 378218792Snp ruser, rhost, luser, __rcmd_errstr, 379218792Snp cmdbuf); 380218792Snp rshd_errx(1, "Login incorrect."); 381218792Snp } 382218792Snp if (!auth_timeok(lc, time(NULL))) 383218792Snp rshd_errx(1, "Logins not available right now"); 384248925Snp } 385248925Snp 386218792Snp /* 387248925Snp * PAM modules might add supplementary groups in 388248925Snp * pam_setcred(), so initialize them first. 389248925Snp * But we need to open the session as root. 390248925Snp */ 391248925Snp if (setusercontext(lc, pwd, pwd->pw_uid, LOGIN_SETGROUP) != 0) { 392248925Snp syslog(LOG_ERR, "setusercontext: %m"); 393248925Snp exit(1); 394248925Snp } 395248925Snp 396248925Snp if ((pam_err = pam_open_session(pamh, 0)) != PAM_SUCCESS) { 397248925Snp syslog(LOG_ERR, "pam_open_session: %s", pam_strerror(pamh, pam_err)); 398248925Snp } else if ((pam_err = pam_setcred(pamh, PAM_ESTABLISH_CRED)) != PAM_SUCCESS) { 399248925Snp syslog(LOG_ERR, "pam_setcred: %s", pam_strerror(pamh, pam_err)); 400248925Snp } 401248925Snp 402248925Snp (void) write(STDERR_FILENO, "\0", 1); 403248925Snp sent_null = 1; 404248925Snp 405248925Snp if (port) { 406248925Snp if (pipe(pv) < 0) 407248925Snp rshd_errx(1, "Can't make pipe."); 408248925Snp pid = fork(); 409248925Snp if (pid == -1) 410248925Snp rshd_errx(1, "Can't fork; try again."); 411248925Snp if (pid) { 412248925Snp (void) close(0); 413248925Snp (void) close(1); 414218792Snp (void) close(2); 415248925Snp (void) close(pv[1]); 416248925Snp 417248925Snp FD_ZERO(&readfrom); 418248925Snp FD_SET(s, &readfrom); 419218792Snp FD_SET(pv[0], &readfrom); 420248925Snp if (pv[0] > s) 421218792Snp nfd = pv[0]; 422218792Snp else 423218792Snp nfd = s; 424248925Snp ioctl(pv[0], FIONBIO, (char *)&one); 425218792Snp 426218792Snp /* should set s nbio! */ 427237436Snp nfd++; 428218792Snp do { 429218792Snp ready = readfrom; 430218792Snp if (select(nfd, &ready, (fd_set *)0, 431218792Snp (fd_set *)0, (struct timeval *)0) < 0) 432218792Snp break; 433218792Snp if (FD_ISSET(s, &ready)) { 434218792Snp int ret; 435218792Snp ret = read(s, &sig, 1); 436218792Snp if (ret <= 0) 437218792Snp FD_CLR(s, &readfrom); 438218792Snp else 439218792Snp killpg(pid, sig); 440218792Snp } 441218792Snp if (FD_ISSET(pv[0], &ready)) { 442218792Snp errno = 0; 443218792Snp cc = read(pv[0], buf, sizeof(buf)); 444218792Snp if (cc <= 0) { 445218792Snp shutdown(s, SHUT_RDWR); 446218792Snp FD_CLR(pv[0], &readfrom); 447218792Snp } else { 448218792Snp (void)write(s, buf, cc); 449218792Snp } 450218792Snp } 451218792Snp 452218792Snp } while (FD_ISSET(s, &readfrom) || 453218792Snp FD_ISSET(pv[0], &readfrom)); 454218792Snp PAM_END; 455218792Snp exit(0); 456218792Snp } 457218792Snp (void) close(s); 458218792Snp (void) close(pv[0]); 459218792Snp dup2(pv[1], 2); 460218792Snp close(pv[1]); 461218792Snp } 462218792Snp else { 463218792Snp pid = fork(); 464218792Snp if (pid == -1) 465218792Snp rshd_errx(1, "Can't fork; try again."); 466218792Snp if (pid) { 467218792Snp /* Parent. */ 468218792Snp while (wait(NULL) > 0 || errno == EINTR) 469218792Snp /* nothing */ ; 470218792Snp PAM_END; 471218792Snp exit(0); 472218792Snp } 473218792Snp } 474218792Snp 475218792Snp for (fd = getdtablesize(); fd > 2; fd--) 476248925Snp (void) close(fd); 477248925Snp if (setsid() == -1) 478218792Snp syslog(LOG_ERR, "setsid() failed: %m"); 479218792Snp if (setlogin(pwd->pw_name) < 0) 480218792Snp syslog(LOG_ERR, "setlogin() failed: %m"); 481218792Snp 482218792Snp if (*pwd->pw_shell == '\0') 483218792Snp pwd->pw_shell = bshell; 484218792Snp (void) pam_setenv(pamh, "HOME", pwd->pw_dir, 1); 485218792Snp (void) pam_setenv(pamh, "SHELL", pwd->pw_shell, 1); 486218792Snp (void) pam_setenv(pamh, "USER", pwd->pw_name, 1); 487218792Snp (void) pam_setenv(pamh, "PATH", _PATH_DEFPATH, 1); 488218792Snp environ = pam_getenvlist(pamh); 489218792Snp (void) pam_end(pamh, pam_err); 490218792Snp cp = strrchr(pwd->pw_shell, '/'); 491218792Snp if (cp) 492218792Snp cp++; 493218792Snp else 494218792Snp cp = pwd->pw_shell; 495218792Snp 496218792Snp if (setusercontext(lc, pwd, pwd->pw_uid, 497218792Snp LOGIN_SETALL & ~LOGIN_SETGROUP) < 0) { 498218792Snp syslog(LOG_ERR, "setusercontext(): %m"); 499218792Snp exit(1); 500218792Snp } 501218792Snp login_close(lc); 502218792Snp endpwent(); 503218792Snp if (log_success || pwd->pw_uid == 0) { 504218792Snp syslog(LOG_INFO|LOG_AUTH, "%s@%s as %s: cmd='%.80s'", 505218792Snp ruser, rhost, luser, cmdbuf); 506218792Snp } 507218792Snp execl(pwd->pw_shell, cp, "-c", cmdbuf, (char *)NULL); 508218792Snp err(1, "%s", pwd->pw_shell); 509218792Snp exit(1); 510218792Snp} 511218792Snp 512218792Snp/* 513218792Snp * Report error to client. Note: can't be used until second socket has 514218792Snp * connected to client, or older clients will hang waiting for that 515248925Snp * connection first. 516218792Snp */ 517250090Snp 518218792Snpstatic void 519218792Snprshd_errx(int errcode, const char *fmt, ...) 520218792Snp{ 521218792Snp va_list ap; 522218792Snp 523218792Snp va_start(ap, fmt); 524218792Snp 525218792Snp if (sent_null == 0) 526218792Snp write(STDERR_FILENO, "\1", 1); 527218792Snp 528218792Snp verrx(errcode, fmt, ap); 529218792Snp /* NOTREACHED */ 530218792Snp} 531218792Snp 532218792Snpvoid 533218792Snpgetstr(char *buf, int cnt, const char *error) 534218792Snp{ 535218792Snp char c; 536218792Snp 537218792Snp do { 538218792Snp if (read(STDIN_FILENO, &c, 1) != 1) 539218792Snp exit(1); 540218792Snp *buf++ = c; 541218792Snp if (--cnt == 0) 542218792Snp rshd_errx(1, "%s too long", error); 543218792Snp } while (c != 0); 544218792Snp} 545218792Snp 546218792Snp/* 547218792Snp * Check whether host h is in our local domain, 548218792Snp * defined as sharing the last two components of the domain part, 549218792Snp * or the entire domain part if the local domain has only one component. 550218792Snp * If either name is unqualified (contains no '.'), 551218792Snp * assume that the host is local, as it will be 552218792Snp * interpreted as such. 553218792Snp */ 554218792Snpint 555218792Snplocal_domain(char *h) 556218792Snp{ 557218792Snp char localhost[MAXHOSTNAMELEN]; 558218792Snp char *p1, *p2; 559218792Snp 560218792Snp localhost[0] = 0; 561218792Snp (void) gethostname(localhost, sizeof(localhost) - 1); 562218792Snp localhost[sizeof(localhost) - 1] = '\0'; 563218792Snp /* XXX truncation! */ 564218792Snp p1 = topdomain(localhost); 565218792Snp p2 = topdomain(h); 566218792Snp if (p1 == NULL || p2 == NULL || !strcasecmp(p1, p2)) 567218792Snp return (1); 568218792Snp return (0); 569218792Snp} 570218792Snp 571218792Snpchar * 572218792Snptopdomain(char *h) 573218792Snp{ 574218792Snp char *p, *maybe = NULL; 575218792Snp int dots = 0; 576218792Snp 577218792Snp for (p = h + strlen(h); p >= h; p--) { 578218792Snp if (*p == '.') { 579218792Snp if (++dots == 2) 580218792Snp return (p); 581218792Snp maybe = p; 582218792Snp } 583218792Snp } 584218792Snp return (maybe); 585218792Snp} 586218792Snp 587218792Snpvoid 588218792Snpusage(void) 589218792Snp{ 590218792Snp 591218792Snp syslog(LOG_ERR, "usage: rshd [-%s]", OPTIONS); 592218792Snp exit(2); 593218792Snp} 594218792Snp