1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 */
21 /*
22 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
23 * Copyright 2013 DEY Storage Systems, Inc.
24 * Copyright (c) 2014 Gary Mills
25 */
26
27 /*
28 * zlogin provides three types of login which allow users in the global
29 * zone to access non-global zones.
30 *
31 * - "interactive login" is similar to rlogin(1); for example, the user could
32 * issue 'zlogin my-zone' or 'zlogin -e ^ -l me my-zone'. The user is
33 * granted a new pty (which is then shoved into the zone), and an I/O
34 * loop between parent and child processes takes care of the interactive
35 * session. In this mode, login(1) (and its -c option, which means
36 * "already authenticated") is employed to take care of the initialization
37 * of the user's session.
38 *
39 * - "non-interactive login" is similar to su(1M); the user could issue
40 * 'zlogin my-zone ls -l' and the command would be run as specified.
41 * In this mode, zlogin sets up pipes as the communication channel, and
42 * 'su' is used to do the login setup work.
43 *
44 * - "console login" is the equivalent to accessing the tip line for a
45 * zone. For example, the user can issue 'zlogin -C my-zone'.
46 * In this mode, zlogin contacts the zoneadmd process via unix domain
47 * socket. If zoneadmd is not running, it starts it. This allows the
48 * console to be available anytime the zone is installed, regardless of
49 * whether it is running.
50 */
51
52 #include <sys/socket.h>
53 #include <sys/termios.h>
54 #include <sys/utsname.h>
55 #include <sys/stat.h>
56 #include <sys/types.h>
57 #include <sys/contract/process.h>
58 #include <sys/ctfs.h>
59 #include <sys/brand.h>
60 #include <sys/wait.h>
61 #include <alloca.h>
62 #include <assert.h>
63 #include <ctype.h>
64 #include <paths.h>
65 #include <door.h>
66 #include <errno.h>
67 #include <nss_dbdefs.h>
68 #include <poll.h>
69 #include <priv.h>
70 #include <pwd.h>
71 #include <unistd.h>
72 #include <utmpx.h>
73 #include <sac.h>
74 #include <signal.h>
75 #include <stdarg.h>
76 #include <stdio.h>
77 #include <stdlib.h>
78 #include <string.h>
79 #include <strings.h>
80 #include <stropts.h>
81 #include <wait.h>
82 #include <zone.h>
83 #include <fcntl.h>
84 #include <libdevinfo.h>
85 #include <libintl.h>
86 #include <locale.h>
87 #include <libzonecfg.h>
88 #include <libcontract.h>
89 #include <libbrand.h>
90 #include <auth_list.h>
91 #include <auth_attr.h>
92 #include <secdb.h>
93
94 static int masterfd;
95 static struct termios save_termios;
96 static struct termios effective_termios;
97 static int save_fd;
98 static struct winsize winsize;
99 static volatile int dead;
100 static volatile pid_t child_pid = -1;
101 static int interactive = 0;
102 static priv_set_t *dropprivs;
103
104 static int nocmdchar = 0;
105 static int failsafe = 0;
106 static char cmdchar = '~';
107 static int quiet = 0;
108
109 static int pollerr = 0;
110
111 static const char *pname;
112 static char *username;
113
114 /*
115 * When forced_login is true, the user is not prompted
116 * for an authentication password in the target zone.
117 */
118 static boolean_t forced_login = B_FALSE;
119
120 #if !defined(TEXT_DOMAIN) /* should be defined by cc -D */
121 #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it wasn't */
122 #endif
123
124 #define SUPATH "/usr/bin/su"
125 #define FAILSAFESHELL "/sbin/sh"
126 #define DEFAULTSHELL "/sbin/sh"
127 #define DEF_PATH "/usr/sbin:/usr/bin"
128
129 #define CLUSTER_BRAND_NAME "cluster"
130
131 /*
132 * The ZLOGIN_BUFSIZ is larger than PIPE_BUF so we can be sure we're clearing
133 * out the pipe when the child is exiting. The ZLOGIN_RDBUFSIZ must be less
134 * than ZLOGIN_BUFSIZ (because we share the buffer in doio). This value is
135 * also chosen in conjunction with the HI_WATER setting to make sure we
136 * don't fill up the pipe. We can write FIFOHIWAT (16k) into the pipe before
137 * blocking. By having ZLOGIN_RDBUFSIZ set to 1k and HI_WATER set to 8k, we
138 * know we can always write a ZLOGIN_RDBUFSIZ chunk into the pipe when there
139 * is less than HI_WATER data already in the pipe.
140 */
141 #define ZLOGIN_BUFSIZ 8192
142 #define ZLOGIN_RDBUFSIZ 1024
143 #define HI_WATER 8192
144
145 /*
146 * See canonify() below. CANONIFY_LEN is the maximum length that a
147 * "canonical" sequence will expand to (backslash, three octal digits, NUL).
148 */
149 #define CANONIFY_LEN 5
150
151 static void
152 usage(void)
153 {
154 (void) fprintf(stderr, gettext("usage: %s [ -nQCES ] [ -e cmdchar ] "
155 "[-l user] zonename [command [args ...] ]\n"), pname);
156 exit(2);
157 }
158
159 static const char *
160 getpname(const char *arg0)
161 {
162 const char *p = strrchr(arg0, '/');
163
164 if (p == NULL)
165 p = arg0;
166 else
167 p++;
168
169 pname = p;
170 return (p);
171 }
172
173 static void
174 zerror(const char *fmt, ...)
175 {
176 va_list alist;
177
178 (void) fprintf(stderr, "%s: ", pname);
179 va_start(alist, fmt);
180 (void) vfprintf(stderr, fmt, alist);
181 va_end(alist);
182 (void) fprintf(stderr, "\n");
183 }
184
185 static void
186 zperror(const char *str)
187 {
188 const char *estr;
189
190 if ((estr = strerror(errno)) != NULL)
191 (void) fprintf(stderr, "%s: %s: %s\n", pname, str, estr);
192 else
193 (void) fprintf(stderr, "%s: %s: errno %d\n", pname, str, errno);
194 }
195
196 /*
197 * The first part of our privilege dropping scheme needs to be called before
198 * fork(), since we must have it for security; we don't want to be surprised
199 * later that we couldn't allocate the privset.
200 */
201 static int
202 prefork_dropprivs()
203 {
204 if ((dropprivs = priv_allocset()) == NULL)
205 return (1);
206
207 priv_basicset(dropprivs);
208 (void) priv_delset(dropprivs, PRIV_PROC_INFO);
209 (void) priv_delset(dropprivs, PRIV_PROC_FORK);
210 (void) priv_delset(dropprivs, PRIV_PROC_EXEC);
211 (void) priv_delset(dropprivs, PRIV_FILE_LINK_ANY);
212
213 /*
214 * We need to keep the basic privilege PROC_SESSION and all unknown
215 * basic privileges as well as the privileges PROC_ZONE and
216 * PROC_OWNER in order to query session information and
217 * send signals.
218 */
219 if (interactive == 0) {
220 (void) priv_addset(dropprivs, PRIV_PROC_ZONE);
221 (void) priv_addset(dropprivs, PRIV_PROC_OWNER);
222 } else {
223 (void) priv_delset(dropprivs, PRIV_PROC_SESSION);
224 }
225
226 return (0);
227 }
228
229 /*
230 * The second part of the privilege drop. We are paranoid about being attacked
231 * by the zone, so we drop all privileges. This should prevent a compromise
232 * which gets us to fork(), exec(), symlink(), etc.
233 */
234 static void
235 postfork_dropprivs()
236 {
237 if ((setppriv(PRIV_SET, PRIV_PERMITTED, dropprivs)) == -1) {
238 zperror(gettext("Warning: could not set permitted privileges"));
239 }
240 if ((setppriv(PRIV_SET, PRIV_LIMIT, dropprivs)) == -1) {
241 zperror(gettext("Warning: could not set limit privileges"));
242 }
243 if ((setppriv(PRIV_SET, PRIV_INHERITABLE, dropprivs)) == -1) {
244 zperror(gettext("Warning: could not set inheritable "
245 "privileges"));
246 }
247 }
248
249 /*
250 * Create the unix domain socket and call the zoneadmd server; handshake
251 * with it to determine whether it will allow us to connect.
252 */
253 static int
254 get_console_master(const char *zname)
255 {
256 int sockfd = -1;
257 struct sockaddr_un servaddr;
258 char clientid[MAXPATHLEN];
259 char handshake[MAXPATHLEN], c;
260 int msglen;
261 int i = 0, err = 0;
262
263 if ((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
264 zperror(gettext("could not create socket"));
265 return (-1);
266 }
267
268 bzero(&servaddr, sizeof (servaddr));
269 servaddr.sun_family = AF_UNIX;
270 (void) snprintf(servaddr.sun_path, sizeof (servaddr.sun_path),
271 "%s/%s.console_sock", ZONES_TMPDIR, zname);
272
273 if (connect(sockfd, (struct sockaddr *)&servaddr,
274 sizeof (servaddr)) == -1) {
275 zperror(gettext("Could not connect to zone console"));
276 goto bad;
277 }
278 masterfd = sockfd;
279
280 msglen = snprintf(clientid, sizeof (clientid), "IDENT %lu %s\n",
281 getpid(), setlocale(LC_MESSAGES, NULL));
282
283 if (msglen >= sizeof (clientid) || msglen < 0) {
284 zerror("protocol error");
285 goto bad;
286 }
287
288 if (write(masterfd, clientid, msglen) != msglen) {
289 zerror("protocol error");
290 goto bad;
291 }
292
293 bzero(handshake, sizeof (handshake));
294
295 /*
296 * Take care not to accumulate more than our fill, and leave room for
297 * the NUL at the end.
298 */
299 while ((err = read(masterfd, &c, 1)) == 1) {
300 if (i >= (sizeof (handshake) - 1))
301 break;
302 if (c == '\n')
303 break;
304 handshake[i] = c;
305 i++;
306 }
307
308 /*
309 * If something went wrong during the handshake we bail; perhaps
310 * the server died off.
311 */
312 if (err == -1) {
313 zperror(gettext("Could not connect to zone console"));
314 goto bad;
315 }
316
317 if (strncmp(handshake, "OK", sizeof (handshake)) == 0)
318 return (0);
319
320 zerror(gettext("Console is already in use by process ID %s."),
321 handshake);
322 bad:
323 (void) close(sockfd);
324 masterfd = -1;
325 return (-1);
326 }
327
328
329 /*
330 * Routines to handle pty creation upon zone entry and to shuttle I/O back
331 * and forth between the two terminals. We also compute and store the
332 * name of the slave terminal associated with the master side.
333 */
334 static int
335 get_master_pty()
336 {
337 if ((masterfd = open("/dev/ptmx", O_RDWR|O_NONBLOCK)) < 0) {
338 zperror(gettext("failed to obtain a pseudo-tty"));
339 return (-1);
340 }
341 if (tcgetattr(STDIN_FILENO, &save_termios) == -1) {
342 zperror(gettext("failed to get terminal settings from stdin"));
343 return (-1);
344 }
345 (void) ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&winsize);
346
347 return (0);
348 }
349
350 /*
351 * This is a bit tricky; normally a pts device will belong to the zone it
352 * is granted to. But in the case of "entering" a zone, we need to establish
353 * the pty before entering the zone so that we can vector I/O to and from it
354 * from the global zone.
355 *
356 * We use the zonept() call to let the ptm driver know what we are up to;
357 * the only other hairy bit is the setting of zoneslavename (which happens
358 * above, in get_master_pty()).
359 */
360 static int
361 init_slave_pty(zoneid_t zoneid, char *devroot)
362 {
363 int slavefd = -1;
364 char *slavename, zoneslavename[MAXPATHLEN];
365
366 /*
367 * Set slave permissions, zone the pts, then unlock it.
368 */
369 if (grantpt(masterfd) != 0) {
370 zperror(gettext("grantpt failed"));
371 return (-1);
372 }
373
374 if (unlockpt(masterfd) != 0) {
375 zperror(gettext("unlockpt failed"));
376 return (-1);
377 }
378
379 /*
380 * We must open the slave side before zoning this pty; otherwise
381 * the kernel would refuse us the open-- zoning a pty makes it
382 * inaccessible to the global zone. Note we are trying to open
383 * the device node via the $ZONEROOT/dev path for this pty.
384 *
385 * Later we'll close the slave out when once we've opened it again
386 * from within the target zone. Blarg.
387 */
388 if ((slavename = ptsname(masterfd)) == NULL) {
389 zperror(gettext("failed to get name for pseudo-tty"));
390 return (-1);
391 }
392
393 (void) snprintf(zoneslavename, sizeof (zoneslavename), "%s%s",
394 devroot, slavename);
395
396 if ((slavefd = open(zoneslavename, O_RDWR)) < 0) {
397 zerror(gettext("failed to open %s: %s"), zoneslavename,
398 strerror(errno));
399 return (-1);
400 }
401
402 /*
403 * Push hardware emulation (ptem), line discipline (ldterm),
404 * and V7/4BSD/Xenix compatibility (ttcompat) modules.
405 */
406 if (ioctl(slavefd, I_PUSH, "ptem") == -1) {
407 zperror(gettext("failed to push ptem module"));
408 if (!failsafe)
409 goto bad;
410 }
411
412 /*
413 * Anchor the stream to prevent malicious I_POPs; we prefer to do
414 * this prior to entering the zone so that we can detect any errors
415 * early, and so that we can set the anchor from the global zone.
416 */
417 if (ioctl(slavefd, I_ANCHOR) == -1) {
418 zperror(gettext("failed to set stream anchor"));
419 if (!failsafe)
420 goto bad;
421 }
422
423 if (ioctl(slavefd, I_PUSH, "ldterm") == -1) {
424 zperror(gettext("failed to push ldterm module"));
425 if (!failsafe)
426 goto bad;
427 }
428 if (ioctl(slavefd, I_PUSH, "ttcompat") == -1) {
429 zperror(gettext("failed to push ttcompat module"));
430 if (!failsafe)
431 goto bad;
432 }
433
434 /*
435 * Propagate terminal settings from the external term to the new one.
436 */
437 if (tcsetattr(slavefd, TCSAFLUSH, &save_termios) == -1) {
438 zperror(gettext("failed to set terminal settings"));
439 if (!failsafe)
440 goto bad;
441 }
442 (void) ioctl(slavefd, TIOCSWINSZ, (char *)&winsize);
443
444 if (zonept(masterfd, zoneid) != 0) {
445 zperror(gettext("could not set zoneid of pty"));
446 goto bad;
447 }
448
449 return (slavefd);
450
451 bad:
452 (void) close(slavefd);
453 return (-1);
454 }
455
456 /*
457 * Place terminal into raw mode.
458 */
459 static int
460 set_tty_rawmode(int fd)
461 {
462 struct termios term;
463 if (tcgetattr(fd, &term) < 0) {
464 zperror(gettext("failed to get user terminal settings"));
465 return (-1);
466 }
467
468 /* Stash for later, so we can revert back to previous mode */
469 save_termios = term;
470 save_fd = fd;
471
472 /* disable 8->7 bit strip, start/stop, enable any char to restart */
473 term.c_iflag &= ~(ISTRIP|IXON|IXANY);
474 /* disable NL->CR, CR->NL, ignore CR, UPPER->lower */
475 term.c_iflag &= ~(INLCR|ICRNL|IGNCR|IUCLC);
476 /* disable output post-processing */
477 term.c_oflag &= ~OPOST;
478 /* disable canonical mode, signal chars, echo & extended functions */
479 term.c_lflag &= ~(ICANON|ISIG|ECHO|IEXTEN);
480
481 term.c_cc[VMIN] = 1; /* byte-at-a-time */
482 term.c_cc[VTIME] = 0;
483
484 if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &term)) {
485 zperror(gettext("failed to set user terminal to raw mode"));
486 return (-1);
487 }
488
489 /*
490 * We need to know the value of VEOF so that we can properly process for
491 * client-side ~<EOF>. But we have obliterated VEOF in term,
492 * because VMIN overloads the same array slot in non-canonical mode.
493 * Stupid @&^%!
494 *
495 * So here we construct the "effective" termios from the current
496 * terminal settings, and the corrected VEOF and VEOL settings.
497 */
498 if (tcgetattr(STDIN_FILENO, &effective_termios) < 0) {
499 zperror(gettext("failed to get user terminal settings"));
500 return (-1);
501 }
502 effective_termios.c_cc[VEOF] = save_termios.c_cc[VEOF];
503 effective_termios.c_cc[VEOL] = save_termios.c_cc[VEOL];
504
505 return (0);
506 }
507
508 /*
509 * Copy terminal window size from our terminal to the pts.
510 */
511 /*ARGSUSED*/
512 static void
513 sigwinch(int s)
514 {
515 struct winsize ws;
516
517 if (ioctl(0, TIOCGWINSZ, &ws) == 0)
518 (void) ioctl(masterfd, TIOCSWINSZ, &ws);
519 }
520
521 static volatile int close_on_sig = -1;
522
523 static void
524 /*ARGSUSED*/
525 sigcld(int s)
526 {
527 int status;
528 pid_t pid;
529
530 /*
531 * Peek at the exit status. If this isn't the process we cared
532 * about, then just reap it.
533 */
534 if ((pid = waitpid(child_pid, &status, WNOHANG|WNOWAIT)) != -1) {
535 if (pid == child_pid &&
536 (WIFEXITED(status) || WIFSIGNALED(status))) {
537 dead = 1;
538 if (close_on_sig != -1) {
539 (void) write(close_on_sig, "a", 1);
540 (void) close(close_on_sig);
541 close_on_sig = -1;
542 }
543 } else {
544 (void) waitpid(pid, &status, WNOHANG);
545 }
546 }
547 }
548
549 /*
550 * Some signals (currently, SIGINT) must be forwarded on to the process
551 * group of the child process.
552 */
553 static void
554 sig_forward(int s)
555 {
556 if (child_pid != -1) {
557 pid_t pgid = getpgid(child_pid);
558 if (pgid != -1)
559 (void) sigsend(P_PGID, pgid, s);
560 }
561 }
562
563 /*
564 * reset terminal settings for global environment
565 */
566 static void
567 reset_tty()
568 {
569 (void) tcsetattr(save_fd, TCSADRAIN, &save_termios);
570 }
571
572 /*
573 * Convert character to printable representation, for display with locally
574 * echoed command characters (like when we need to display ~^D)
575 */
576 static void
577 canonify(char c, char *cc)
578 {
579 if (isprint(c)) {
580 cc[0] = c;
581 cc[1] = '\0';
582 } else if (c >= 0 && c <= 31) { /* ^@ through ^_ */
583 cc[0] = '^';
584 cc[1] = c + '@';
585 cc[2] = '\0';
586 } else {
587 cc[0] = '\\';
588 cc[1] = ((c >> 6) & 7) + '0';
589 cc[2] = ((c >> 3) & 7) + '0';
590 cc[3] = (c & 7) + '0';
591 cc[4] = '\0';
592 }
593 }
594
595 /*
596 * process_user_input watches the input stream for the escape sequence for
597 * 'quit' (by default, tilde-period). Because we might be fed just one
598 * keystroke at a time, state associated with the user input (are we at the
599 * beginning of the line? are we locally echoing the next character?) is
600 * maintained by beginning_of_line and local_echo across calls to the routine.
601 * If the write to outfd fails, we'll try to read from infd in an attempt
602 * to prevent deadlock between the two processes.
603 *
604 * This routine returns -1 when the 'quit' escape sequence has been issued,
605 * or an error is encountered, 1 if stdin is EOF, and 0 otherwise.
606 */
607 static int
608 process_user_input(int outfd, int infd)
609 {
610 static boolean_t beginning_of_line = B_TRUE;
611 static boolean_t local_echo = B_FALSE;
612 char ibuf[ZLOGIN_BUFSIZ];
613 int nbytes;
614 char *buf = ibuf;
615 char c = *buf;
616
617 nbytes = read(STDIN_FILENO, ibuf, ZLOGIN_RDBUFSIZ);
618 if (nbytes == -1 && (errno != EINTR || dead))
619 return (-1);
620
621 if (nbytes == -1) /* The read was interrupted. */
622 return (0);
623
624 /* 0 read means EOF, close the pipe to the child */
625 if (nbytes == 0)
626 return (1);
627
628 for (c = *buf; nbytes > 0; c = *buf, --nbytes) {
629 buf++;
630 if (beginning_of_line && !nocmdchar) {
631 beginning_of_line = B_FALSE;
632 if (c == cmdchar) {
633 local_echo = B_TRUE;
634 continue;
635 }
636 } else if (local_echo) {
637 local_echo = B_FALSE;
638 if (c == '.' || c == effective_termios.c_cc[VEOF]) {
639 char cc[CANONIFY_LEN];
640
641 canonify(c, cc);
642 (void) write(STDOUT_FILENO, &cmdchar, 1);
643 (void) write(STDOUT_FILENO, cc, strlen(cc));
644 return (-1);
645 }
646 }
647 retry:
648 if (write(outfd, &c, 1) <= 0) {
649 /*
650 * Since the fd we are writing to is opened with
651 * O_NONBLOCK it is possible to get EAGAIN if the
652 * pipe is full. One way this could happen is if we
653 * are writing a lot of data into the pipe in this loop
654 * and the application on the other end is echoing that
655 * data back out to its stdout. The output pipe can
656 * fill up since we are stuck here in this loop and not
657 * draining the other pipe. We can try to read some of
658 * the data to see if we can drain the pipe so that the
659 * application can continue to make progress. The read
660 * is non-blocking so we won't hang here. We also wait
661 * a bit before retrying since there could be other
662 * reasons why the pipe is full and we don't want to
663 * continuously retry.
664 */
665 if (errno == EAGAIN) {
666 struct timespec rqtp;
667 int ln;
668 char obuf[ZLOGIN_BUFSIZ];
669
670 if ((ln = read(infd, obuf, ZLOGIN_BUFSIZ)) > 0)
671 (void) write(STDOUT_FILENO, obuf, ln);
672
673 /* sleep for 10 milliseconds */
674 rqtp.tv_sec = 0;
675 rqtp.tv_nsec = 10 * (NANOSEC / MILLISEC);
676 (void) nanosleep(&rqtp, NULL);
677 if (!dead)
678 goto retry;
679 }
680
681 return (-1);
682 }
683 beginning_of_line = (c == '\r' || c == '\n' ||
684 c == effective_termios.c_cc[VKILL] ||
685 c == effective_termios.c_cc[VEOL] ||
686 c == effective_termios.c_cc[VSUSP] ||
687 c == effective_termios.c_cc[VINTR]);
688 }
689 return (0);
690 }
691
692 /*
693 * This function prevents deadlock between zlogin and the application in the
694 * zone that it is talking to. This can happen when we read from zlogin's
695 * stdin and write the data down the pipe to the application. If the pipe
696 * is full, we'll block in the write. Because zlogin could be blocked in
697 * the write, it would never read the application's stdout/stderr so the
698 * application can then block on those writes (when the pipe fills up). If the
699 * the application gets blocked this way, it can never get around to reading
700 * its stdin so that zlogin can unblock from its write. Once in this state,
701 * the two processes are deadlocked.
702 *
703 * To prevent this, we want to verify that we can write into the pipe before we
704 * read from our stdin. If the pipe already is pretty full, we bypass the read
705 * for now. We'll circle back here again after the poll() so that we can
706 * try again. When this function is called, we already know there is data
707 * ready to read on STDIN_FILENO. We return -1 if there is a problem, 1 if
708 * stdin is EOF, and 0 if everything is ok (even though we might not have
709 * read/written any data into the pipe on this iteration).
710 */
711 static int
712 process_raw_input(int stdin_fd, int appin_fd)
713 {
714 int cc;
715 struct stat64 sb;
716 char ibuf[ZLOGIN_RDBUFSIZ];
717
718 /* Check how much data is already in the pipe */
719 if (fstat64(appin_fd, &sb) == -1) {
720 perror("stat failed");
721 return (-1);
722 }
723
724 if (dead)
725 return (-1);
726
727 /*
728 * The pipe already has a lot of data in it, don't write any more
729 * right now.
730 */
731 if (sb.st_size >= HI_WATER)
732 return (0);
733
734 cc = read(STDIN_FILENO, ibuf, ZLOGIN_RDBUFSIZ);
735 if (cc == -1 && (errno != EINTR || dead))
736 return (-1);
737
738 if (cc == -1) /* The read was interrupted. */
739 return (0);
740
741 /* 0 read means EOF, close the pipe to the child */
742 if (cc == 0)
743 return (1);
744
745 /*
746 * stdin_fd is stdin of the target; so, the thing we'll write the user
747 * data *to*.
748 */
749 if (write(stdin_fd, ibuf, cc) == -1)
750 return (-1);
751
752 return (0);
753 }
754
755 /*
756 * Write the output from the application running in the zone. We can get
757 * a signal during the write (usually it would be SIGCHLD when the application
758 * has exited) so we loop to make sure we have written all of the data we read.
759 */
760 static int
761 process_output(int in_fd, int out_fd)
762 {
763 int wrote = 0;
764 int cc;
765 char ibuf[ZLOGIN_BUFSIZ];
766
767 cc = read(in_fd, ibuf, ZLOGIN_BUFSIZ);
768 if (cc == -1 && (errno != EINTR || dead))
769 return (-1);
770 if (cc == 0) /* EOF */
771 return (-1);
772 if (cc == -1) /* The read was interrupted. */
773 return (0);
774
775 do {
776 int len;
777
778 len = write(out_fd, ibuf + wrote, cc - wrote);
779 if (len == -1 && errno != EINTR)
780 return (-1);
781 if (len != -1)
782 wrote += len;
783 } while (wrote < cc);
784
785 return (0);
786 }
787
788 /*
789 * This is the main I/O loop, and is shared across all zlogin modes.
790 * Parameters:
791 * stdin_fd: The fd representing 'stdin' for the slave side; input to
792 * the zone will be written here.
793 *
794 * appin_fd: The fd representing the other end of the 'stdin' pipe (when
795 * we're running non-interactive); used in process_raw_input
796 * to ensure we don't fill up the application's stdin pipe.
797 *
798 * stdout_fd: The fd representing 'stdout' for the slave side; output
799 * from the zone will arrive here.
800 *
801 * stderr_fd: The fd representing 'stderr' for the slave side; output
802 * from the zone will arrive here.
803 *
804 * raw_mode: If TRUE, then no processing (for example, for '~.') will
805 * be performed on the input coming from STDIN.
806 *
807 * stderr_fd may be specified as -1 if there is no stderr (only non-interactive
808 * mode supplies a stderr).
809 *
810 */
811 static void
812 doio(int stdin_fd, int appin_fd, int stdout_fd, int stderr_fd, int sig_fd,
813 boolean_t raw_mode)
814 {
815 struct pollfd pollfds[4];
816 char ibuf[ZLOGIN_BUFSIZ];
817 int cc, ret;
818
819 /* read from stdout of zone and write to stdout of global zone */
820 pollfds[0].fd = stdout_fd;
821 pollfds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
822
823 /* read from stderr of zone and write to stderr of global zone */
824 pollfds[1].fd = stderr_fd;
825 pollfds[1].events = pollfds[0].events;
826
827 /* read from stdin of global zone and write to stdin of zone */
828 pollfds[2].fd = STDIN_FILENO;
829 pollfds[2].events = pollfds[0].events;
830
831 /* read from signalling pipe so we know when child dies */
832 pollfds[3].fd = sig_fd;
833 pollfds[3].events = pollfds[0].events;
834
835 for (;;) {
836 pollfds[0].revents = pollfds[1].revents =
837 pollfds[2].revents = pollfds[3].revents = 0;
838
839 if (dead)
840 break;
841
842 /*
843 * There is a race condition here where we can receive the
844 * child death signal, set the dead flag, but since we have
845 * passed the test above, we would go into poll and hang.
846 * To avoid this we use the sig_fd as an additional poll fd.
847 * The signal handler writes into the other end of this pipe
848 * when the child dies so that the poll will always see that
849 * input and proceed. We just loop around at that point and
850 * then notice the dead flag.
851 */
852
853 ret = poll(pollfds,
854 sizeof (pollfds) / sizeof (struct pollfd), -1);
855
856 if (ret == -1 && errno != EINTR) {
857 perror("poll failed");
858 break;
859 }
860
861 if (errno == EINTR && dead) {
862 break;
863 }
864
865 /* event from master side stdout */
866 if (pollfds[0].revents) {
867 if (pollfds[0].revents &
868 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
869 if (process_output(stdout_fd, STDOUT_FILENO)
870 != 0)
871 break;
872 } else {
873 pollerr = pollfds[0].revents;
874 break;
875 }
876 }
877
878 /* event from master side stderr */
879 if (pollfds[1].revents) {
880 if (pollfds[1].revents &
881 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
882 if (process_output(stderr_fd, STDERR_FILENO)
883 != 0)
884 break;
885 } else {
886 pollerr = pollfds[1].revents;
887 break;
888 }
889 }
890
891 /* event from user STDIN side */
892 if (pollfds[2].revents) {
893 if (pollfds[2].revents &
894 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
895 /*
896 * stdin fd is stdin of the target; so,
897 * the thing we'll write the user data *to*.
898 *
899 * Also, unlike on the output side, we
900 * close the pipe on a zero-length message.
901 */
902 int res;
903
904 if (raw_mode)
905 res = process_raw_input(stdin_fd,
906 appin_fd);
907 else
908 res = process_user_input(stdin_fd,
909 stdout_fd);
910
911 if (res < 0)
912 break;
913 if (res > 0) {
914 /* EOF (close) child's stdin_fd */
915 pollfds[2].fd = -1;
916 while ((res = close(stdin_fd)) != 0 &&
917 errno == EINTR)
918 ;
919 if (res != 0)
920 break;
921 }
922
923 } else if (raw_mode && pollfds[2].revents & POLLHUP) {
924 /*
925 * It's OK to get a POLLHUP on STDIN-- it
926 * always happens if you do:
927 *
928 * echo foo | zlogin <zone> <command>
929 *
930 * We reset fd to -1 in this case to clear
931 * the condition and close the pipe (EOF) to
932 * the other side in order to wrap things up.
933 */
934 int res;
935
936 pollfds[2].fd = -1;
937 while ((res = close(stdin_fd)) != 0 &&
938 errno == EINTR)
939 ;
940 if (res != 0)
941 break;
942 } else {
943 pollerr = pollfds[2].revents;
944 break;
945 }
946 }
947 }
948
949 /*
950 * We are in the midst of dying, but try to poll with a short
951 * timeout to see if we can catch the last bit of I/O from the
952 * children.
953 */
954 retry:
955 pollfds[0].revents = pollfds[1].revents = 0;
956 (void) poll(pollfds, 2, 100);
957 if (pollfds[0].revents &
958 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
959 if ((cc = read(stdout_fd, ibuf, ZLOGIN_BUFSIZ)) > 0) {
960 (void) write(STDOUT_FILENO, ibuf, cc);
961 goto retry;
962 }
963 }
964 if (pollfds[1].revents &
965 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
966 if ((cc = read(stderr_fd, ibuf, ZLOGIN_BUFSIZ)) > 0) {
967 (void) write(STDERR_FILENO, ibuf, cc);
968 goto retry;
969 }
970 }
971 }
972
973 /*
974 * Fetch the user_cmd brand hook for getting a user's passwd(4) entry.
975 */
976 static const char *
977 zone_get_user_cmd(brand_handle_t bh, const char *login, char *user_cmd,
978 size_t len)
979 {
980 bzero(user_cmd, sizeof (user_cmd));
981 if (brand_get_user_cmd(bh, login, user_cmd, len) != 0)
982 return (NULL);
983
984 return (user_cmd);
985 }
986
987 /* From libc */
988 extern int str2passwd(const char *, int, void *, char *, int);
989
990 /*
991 * exec() the user_cmd brand hook, and convert the output string to a
992 * struct passwd. This is to be called after zone_enter().
993 *
994 */
995 static struct passwd *
996 zone_get_user_pw(const char *user_cmd, struct passwd *pwent, char *pwbuf,
997 int pwbuflen)
998 {
999 char pwline[NSS_BUFLEN_PASSWD];
1000 char *cin = NULL;
1001 FILE *fin;
1002 int status;
1003
1004 assert(getzoneid() != GLOBAL_ZONEID);
1005
1006 if ((fin = popen(user_cmd, "r")) == NULL)
1007 return (NULL);
1008
1009 while (cin == NULL && !feof(fin))
1010 cin = fgets(pwline, sizeof (pwline), fin);
1011
1012 if (cin == NULL) {
1013 (void) pclose(fin);
1014 return (NULL);
1015 }
1016
1017 status = pclose(fin);
1018 if (!WIFEXITED(status))
1019 return (NULL);
1020 if (WEXITSTATUS(status) != 0)
1021 return (NULL);
1022
1023 if (str2passwd(pwline, sizeof (pwline), pwent, pwbuf, pwbuflen) == 0)
1024 return (pwent);
1025 else
1026 return (NULL);
1027 }
1028
1029 static char **
1030 zone_login_cmd(brand_handle_t bh, const char *login)
1031 {
1032 static char result_buf[ARG_MAX];
1033 char **new_argv, *ptr, *lasts;
1034 int n, a;
1035
1036 /* Get the login command for the target zone. */
1037 bzero(result_buf, sizeof (result_buf));
1038
1039 if (forced_login) {
1040 if (brand_get_forcedlogin_cmd(bh, login,
1041 result_buf, sizeof (result_buf)) != 0)
1042 return (NULL);
1043 } else {
1044 if (brand_get_login_cmd(bh, login,
1045 result_buf, sizeof (result_buf)) != 0)
1046 return (NULL);
1047 }
1048
1049 /*
1050 * We got back a string that we'd like to execute. But since
1051 * we're not doing the execution via a shell we'll need to convert
1052 * the exec string to an array of strings. We'll do that here
1053 * but we're going to be very simplistic about it and break stuff
1054 * up based on spaces. We're not even going to support any kind
1055 * of quoting or escape characters. It's truly amazing that
1056 * there is no library function in OpenSolaris to do this for us.
1057 */
1058
1059 /*
1060 * Be paranoid. Since we're deliniating based on spaces make
1061 * sure there are no adjacent spaces.
1062 */
1063 if (strstr(result_buf, " ") != NULL)
1064 return (NULL);
1065
1066 /* Remove any trailing whitespace. */
1067 n = strlen(result_buf);
1068 if (result_buf[n - 1] == ' ')
1069 result_buf[n - 1] = '\0';
1070
1071 /* Count how many elements there are in the exec string. */
1072 ptr = result_buf;
1073 for (n = 2; ((ptr = strchr(ptr + 1, (int)' ')) != NULL); n++)
1074 ;
1075
1076 /* Allocate the argv array that we're going to return. */
1077 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1078 return (NULL);
1079
1080 /* Tokenize the exec string and return. */
1081 a = 0;
1082 new_argv[a++] = result_buf;
1083 if (n > 2) {
1084 (void) strtok_r(result_buf, " ", &lasts);
1085 while ((new_argv[a++] = strtok_r(NULL, " ", &lasts)) != NULL)
1086 ;
1087 } else {
1088 new_argv[a++] = NULL;
1089 }
1090 assert(n == a);
1091 return (new_argv);
1092 }
1093
1094 /*
1095 * Prepare argv array for exec'd process; if we're passing commands to the
1096 * new process, then use su(1M) to do the invocation. Otherwise, use
1097 * 'login -z <from_zonename> -f' (-z is an undocumented option which tells
1098 * login that we're coming from another zone, and to disregard its CONSOLE
1099 * checks).
1100 */
1101 static char **
1102 prep_args(brand_handle_t bh, const char *login, char **argv)
1103 {
1104 int argc = 0, a = 0, i, n = -1;
1105 char **new_argv;
1106
1107 if (argv != NULL) {
1108 size_t subshell_len = 1;
1109 char *subshell;
1110
1111 while (argv[argc] != NULL)
1112 argc++;
1113
1114 for (i = 0; i < argc; i++) {
1115 subshell_len += strlen(argv[i]) + 1;
1116 }
1117 if ((subshell = calloc(1, subshell_len)) == NULL)
1118 return (NULL);
1119
1120 for (i = 0; i < argc; i++) {
1121 (void) strcat(subshell, argv[i]);
1122 (void) strcat(subshell, " ");
1123 }
1124
1125 if (failsafe) {
1126 n = 4;
1127 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1128 return (NULL);
1129
1130 new_argv[a++] = FAILSAFESHELL;
1131 } else {
1132 n = 5;
1133 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1134 return (NULL);
1135
1136 new_argv[a++] = SUPATH;
1137 if (strcmp(login, "root") != 0) {
1138 new_argv[a++] = "-";
1139 n++;
1140 }
1141 new_argv[a++] = (char *)login;
1142 }
1143 new_argv[a++] = "-c";
1144 new_argv[a++] = subshell;
1145 new_argv[a++] = NULL;
1146 assert(a == n);
1147 } else {
1148 if (failsafe) {
1149 n = 2;
1150 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1151 return (NULL);
1152 new_argv[a++] = FAILSAFESHELL;
1153 new_argv[a++] = NULL;
1154 assert(n == a);
1155 } else {
1156 new_argv = zone_login_cmd(bh, login);
1157 }
1158 }
1159
1160 return (new_argv);
1161 }
1162
1163 /*
1164 * Helper routine for prep_env below.
1165 */
1166 static char *
1167 add_env(char *name, char *value)
1168 {
1169 size_t sz = strlen(name) + strlen(value) + 2; /* name, =, value, NUL */
1170 char *str;
1171
1172 if ((str = malloc(sz)) == NULL)
1173 return (NULL);
1174
1175 (void) snprintf(str, sz, "%s=%s", name, value);
1176 return (str);
1177 }
1178
1179 /*
1180 * Prepare envp array for exec'd process.
1181 */
1182 static char **
1183 prep_env()
1184 {
1185 int e = 0, size = 1;
1186 char **new_env, *estr;
1187 char *term = getenv("TERM");
1188
1189 size++; /* for $PATH */
1190 if (term != NULL)
1191 size++;
1192
1193 /*
1194 * In failsafe mode we set $HOME, since '-l' isn't valid in this mode.
1195 * We also set $SHELL, since neither login nor su will be around to do
1196 * it.
1197 */
1198 if (failsafe)
1199 size += 2;
1200
1201 if ((new_env = malloc(sizeof (char *) * size)) == NULL)
1202 return (NULL);
1203
1204 if ((estr = add_env("PATH", DEF_PATH)) == NULL)
1205 return (NULL);
1206 new_env[e++] = estr;
1207
1208 if (term != NULL) {
1209 if ((estr = add_env("TERM", term)) == NULL)
1210 return (NULL);
1211 new_env[e++] = estr;
1212 }
1213
1214 if (failsafe) {
1215 if ((estr = add_env("HOME", "/")) == NULL)
1216 return (NULL);
1217 new_env[e++] = estr;
1218
1219 if ((estr = add_env("SHELL", FAILSAFESHELL)) == NULL)
1220 return (NULL);
1221 new_env[e++] = estr;
1222 }
1223
1224 new_env[e++] = NULL;
1225
1226 assert(e == size);
1227
1228 return (new_env);
1229 }
1230
1231 /*
1232 * Finish the preparation of the envp array for exec'd non-interactive
1233 * zlogins. This is called in the child process *after* we zone_enter(), since
1234 * it derives things we can only know within the zone, such as $HOME, $SHELL,
1235 * etc. We need only do this in the non-interactive, mode, since otherwise
1236 * login(1) will do it. We don't do this in failsafe mode, since it presents
1237 * additional ways in which the command could fail, and we'd prefer to avoid
1238 * that.
1239 */
1240 static char **
1241 prep_env_noninteractive(const char *user_cmd, char **env)
1242 {
1243 size_t size;
1244 char **new_env;
1245 int e, i;
1246 char *estr;
1247 char varmail[LOGNAME_MAX + 11]; /* strlen(/var/mail/) = 10, NUL */
1248 char pwbuf[NSS_BUFLEN_PASSWD + 1];
1249 struct passwd pwent;
1250 struct passwd *pw = NULL;
1251
1252 assert(env != NULL);
1253 assert(failsafe == 0);
1254
1255 /*
1256 * Exec the "user_cmd" brand hook to get a pwent for the
1257 * login user. If this fails, HOME will be set to "/", SHELL
1258 * will be set to $DEFAULTSHELL, and we will continue to exec
1259 * SUPATH <login> -c <cmd>.
1260 */
1261 pw = zone_get_user_pw(user_cmd, &pwent, pwbuf, sizeof (pwbuf));
1262
1263 /*
1264 * Get existing envp size.
1265 */
1266 for (size = 0; env[size] != NULL; size++)
1267 ;
1268
1269 e = size;
1270
1271 /*
1272 * Finish filling out the environment; we duplicate the environment
1273 * setup described in login(1), for lack of a better precedent.
1274 */
1275 if (pw != NULL)
1276 size += 3; /* LOGNAME, HOME, MAIL */
1277 else
1278 size += 1; /* HOME */
1279
1280 size++; /* always fill in SHELL */
1281 size++; /* terminating NULL */
1282
1283 if ((new_env = malloc(sizeof (char *) * size)) == NULL)
1284 goto malloc_fail;
1285
1286 /*
1287 * Copy existing elements of env into new_env.
1288 */
1289 for (i = 0; env[i] != NULL; i++) {
1290 if ((new_env[i] = strdup(env[i])) == NULL)
1291 goto malloc_fail;
1292 }
1293 assert(e == i);
1294
1295 if (pw != NULL) {
1296 if ((estr = add_env("LOGNAME", pw->pw_name)) == NULL)
1297 goto malloc_fail;
1298 new_env[e++] = estr;
1299
1300 if ((estr = add_env("HOME", pw->pw_dir)) == NULL)
1301 goto malloc_fail;
1302 new_env[e++] = estr;
1303
1304 if (chdir(pw->pw_dir) != 0)
1305 zerror(gettext("Could not chdir to home directory "
1306 "%s: %s"), pw->pw_dir, strerror(errno));
1307
1308 (void) snprintf(varmail, sizeof (varmail), "/var/mail/%s",
1309 pw->pw_name);
1310 if ((estr = add_env("MAIL", varmail)) == NULL)
1311 goto malloc_fail;
1312 new_env[e++] = estr;
1313 } else {
1314 if ((estr = add_env("HOME", "/")) == NULL)
1315 goto malloc_fail;
1316 new_env[e++] = estr;
1317 }
1318
1319 if (pw != NULL && strlen(pw->pw_shell) > 0) {
1320 if ((estr = add_env("SHELL", pw->pw_shell)) == NULL)
1321 goto malloc_fail;
1322 new_env[e++] = estr;
1323 } else {
1324 if ((estr = add_env("SHELL", DEFAULTSHELL)) == NULL)
1325 goto malloc_fail;
1326 new_env[e++] = estr;
1327 }
1328
1329 new_env[e++] = NULL; /* add terminating NULL */
1330
1331 assert(e == size);
1332 return (new_env);
1333
1334 malloc_fail:
1335 zperror(gettext("failed to allocate memory for process environment"));
1336 return (NULL);
1337 }
1338
1339 static int
1340 close_func(void *slavefd, int fd)
1341 {
1342 if (fd != *(int *)slavefd)
1343 (void) close(fd);
1344 return (0);
1345 }
1346
1347 static void
1348 set_cmdchar(char *cmdcharstr)
1349 {
1350 char c;
1351 long lc;
1352
1353 if ((c = *cmdcharstr) != '\\') {
1354 cmdchar = c;
1355 return;
1356 }
1357
1358 c = cmdcharstr[1];
1359 if (c == '\0' || c == '\\') {
1360 cmdchar = '\\';
1361 return;
1362 }
1363
1364 if (c < '0' || c > '7') {
1365 zerror(gettext("Unrecognized escape character option %s"),
1366 cmdcharstr);
1367 usage();
1368 }
1369
1370 lc = strtol(cmdcharstr + 1, NULL, 8);
1371 if (lc < 0 || lc > 255) {
1372 zerror(gettext("Octal escape character '%s' too large"),
1373 cmdcharstr);
1374 usage();
1375 }
1376 cmdchar = (char)lc;
1377 }
1378
1379 static int
1380 setup_utmpx(char *slavename)
1381 {
1382 struct utmpx ut;
1383
1384 bzero(&ut, sizeof (ut));
1385 (void) strncpy(ut.ut_user, ".zlogin", sizeof (ut.ut_user));
1386 (void) strncpy(ut.ut_line, slavename, sizeof (ut.ut_line));
1387 ut.ut_pid = getpid();
1388 ut.ut_id[0] = 'z';
1389 ut.ut_id[1] = ut.ut_id[2] = ut.ut_id[3] = (char)SC_WILDC;
1390 ut.ut_type = LOGIN_PROCESS;
1391 (void) time(&ut.ut_tv.tv_sec);
1392
1393 if (makeutx(&ut) == NULL) {
1394 zerror(gettext("makeutx failed"));
1395 return (-1);
1396 }
1397 return (0);
1398 }
1399
1400 static void
1401 release_lock_file(int lockfd)
1402 {
1403 (void) close(lockfd);
1404 }
1405
1406 static int
1407 grab_lock_file(const char *zone_name, int *lockfd)
1408 {
1409 char pathbuf[PATH_MAX];
1410 struct flock flock;
1411
1412 if (mkdir(ZONES_TMPDIR, S_IRWXU) < 0 && errno != EEXIST) {
1413 zerror(gettext("could not mkdir %s: %s"), ZONES_TMPDIR,
1414 strerror(errno));
1415 return (-1);
1416 }
1417 (void) chmod(ZONES_TMPDIR, S_IRWXU);
1418 (void) snprintf(pathbuf, sizeof (pathbuf), "%s/%s.zoneadm.lock",
1419 ZONES_TMPDIR, zone_name);
1420
1421 if ((*lockfd = open(pathbuf, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
1422 zerror(gettext("could not open %s: %s"), pathbuf,
1423 strerror(errno));
1424 return (-1);
1425 }
1426 /*
1427 * Lock the file to synchronize with other zoneadmds
1428 */
1429 flock.l_type = F_WRLCK;
1430 flock.l_whence = SEEK_SET;
1431 flock.l_start = (off_t)0;
1432 flock.l_len = (off_t)0;
1433 if (fcntl(*lockfd, F_SETLKW, &flock) < 0) {
1434 zerror(gettext("unable to lock %s: %s"), pathbuf,
1435 strerror(errno));
1436 release_lock_file(*lockfd);
1437 return (-1);
1438 }
1439 return (Z_OK);
1440 }
1441
1442 static int
1443 start_zoneadmd(const char *zone_name)
1444 {
1445 pid_t retval;
1446 int pstatus = 0, error = -1, lockfd, doorfd;
1447 struct door_info info;
1448 char doorpath[MAXPATHLEN];
1449
1450 (void) snprintf(doorpath, sizeof (doorpath), ZONE_DOOR_PATH, zone_name);
1451
1452 if (grab_lock_file(zone_name, &lockfd) != Z_OK)
1453 return (-1);
1454 /*
1455 * We must do the door check with the lock held. Otherwise, we
1456 * might race against another zoneadm/zlogin process and wind
1457 * up with two processes trying to start zoneadmd at the same
1458 * time. zoneadmd will detect this, and fail, but we prefer this
1459 * to be as seamless as is practical, from a user perspective.
1460 */
1461 if ((doorfd = open(doorpath, O_RDONLY)) < 0) {
1462 if (errno != ENOENT) {
1463 zerror("failed to open %s: %s", doorpath,
1464 strerror(errno));
1465 goto out;
1466 }
1467 } else {
1468 /*
1469 * Seems to be working ok.
1470 */
1471 if (door_info(doorfd, &info) == 0 &&
1472 ((info.di_attributes & DOOR_REVOKED) == 0)) {
1473 error = 0;
1474 goto out;
1475 }
1476 }
1477
1478 if ((child_pid = fork()) == -1) {
1479 zperror(gettext("could not fork"));
1480 goto out;
1481 } else if (child_pid == 0) {
1482 /* child process */
1483 (void) execl("/usr/lib/zones/zoneadmd", "zoneadmd", "-z",
1484 zone_name, NULL);
1485 zperror(gettext("could not exec zoneadmd"));
1486 _exit(1);
1487 }
1488
1489 /* parent process */
1490 do {
1491 retval = waitpid(child_pid, &pstatus, 0);
1492 } while (retval != child_pid);
1493 if (WIFSIGNALED(pstatus) ||
1494 (WIFEXITED(pstatus) && WEXITSTATUS(pstatus) != 0)) {
1495 zerror(gettext("could not start %s"), "zoneadmd");
1496 goto out;
1497 }
1498 error = 0;
1499 out:
1500 release_lock_file(lockfd);
1501 (void) close(doorfd);
1502 return (error);
1503 }
1504
1505 static int
1506 init_template(void)
1507 {
1508 int fd;
1509 int err = 0;
1510
1511 fd = open64(CTFS_ROOT "/process/template", O_RDWR);
1512 if (fd == -1)
1513 return (-1);
1514
1515 /*
1516 * zlogin doesn't do anything with the contract.
1517 * Deliver no events, don't inherit, and allow it to be orphaned.
1518 */
1519 err |= ct_tmpl_set_critical(fd, 0);
1520 err |= ct_tmpl_set_informative(fd, 0);
1521 err |= ct_pr_tmpl_set_fatal(fd, CT_PR_EV_HWERR);
1522 err |= ct_pr_tmpl_set_param(fd, CT_PR_PGRPONLY | CT_PR_REGENT);
1523 if (err || ct_tmpl_activate(fd)) {
1524 (void) close(fd);
1525 return (-1);
1526 }
1527
1528 return (fd);
1529 }
1530
1531 static int
1532 noninteractive_login(char *zonename, const char *user_cmd, zoneid_t zoneid,
1533 char **new_args, char **new_env)
1534 {
1535 pid_t retval;
1536 int stdin_pipe[2], stdout_pipe[2], stderr_pipe[2], dead_child_pipe[2];
1537 int child_status;
1538 int tmpl_fd;
1539 sigset_t block_cld;
1540
1541 if ((tmpl_fd = init_template()) == -1) {
1542 reset_tty();
1543 zperror(gettext("could not create contract"));
1544 return (1);
1545 }
1546
1547 if (pipe(stdin_pipe) != 0) {
1548 zperror(gettext("could not create STDIN pipe"));
1549 return (1);
1550 }
1551 /*
1552 * When the user types ^D, we get a zero length message on STDIN.
1553 * We need to echo that down the pipe to send it to the other side;
1554 * but by default, pipes don't propagate zero-length messages. We
1555 * toggle that behavior off using I_SWROPT. See streamio(7i).
1556 */
1557 if (ioctl(stdin_pipe[0], I_SWROPT, SNDZERO) != 0) {
1558 zperror(gettext("could not configure STDIN pipe"));
1559 return (1);
1560
1561 }
1562 if (pipe(stdout_pipe) != 0) {
1563 zperror(gettext("could not create STDOUT pipe"));
1564 return (1);
1565 }
1566 if (pipe(stderr_pipe) != 0) {
1567 zperror(gettext("could not create STDERR pipe"));
1568 return (1);
1569 }
1570
1571 if (pipe(dead_child_pipe) != 0) {
1572 zperror(gettext("could not create signalling pipe"));
1573 return (1);
1574 }
1575 close_on_sig = dead_child_pipe[0];
1576
1577 /*
1578 * If any of the pipe FD's winds up being less than STDERR, then we
1579 * have a mess on our hands-- and we are lacking some of the I/O
1580 * streams we would expect anyway. So we bail.
1581 */
1582 if (stdin_pipe[0] <= STDERR_FILENO ||
1583 stdin_pipe[1] <= STDERR_FILENO ||
1584 stdout_pipe[0] <= STDERR_FILENO ||
1585 stdout_pipe[1] <= STDERR_FILENO ||
1586 stderr_pipe[0] <= STDERR_FILENO ||
1587 stderr_pipe[1] <= STDERR_FILENO ||
1588 dead_child_pipe[0] <= STDERR_FILENO ||
1589 dead_child_pipe[1] <= STDERR_FILENO) {
1590 zperror(gettext("process lacks valid STDIN, STDOUT, STDERR"));
1591 return (1);
1592 }
1593
1594 if (prefork_dropprivs() != 0) {
1595 zperror(gettext("could not allocate privilege set"));
1596 return (1);
1597 }
1598
1599 (void) sigset(SIGCLD, sigcld);
1600 (void) sigemptyset(&block_cld);
1601 (void) sigaddset(&block_cld, SIGCLD);
1602 (void) sigprocmask(SIG_BLOCK, &block_cld, NULL);
1603
1604 if ((child_pid = fork()) == -1) {
1605 (void) ct_tmpl_clear(tmpl_fd);
1606 (void) close(tmpl_fd);
1607 zperror(gettext("could not fork"));
1608 return (1);
1609 } else if (child_pid == 0) { /* child process */
1610 (void) ct_tmpl_clear(tmpl_fd);
1611
1612 /*
1613 * Do a dance to get the pipes hooked up as FD's 0, 1 and 2.
1614 */
1615 (void) close(STDIN_FILENO);
1616 (void) close(STDOUT_FILENO);
1617 (void) close(STDERR_FILENO);
1618 (void) dup2(stdin_pipe[1], STDIN_FILENO);
1619 (void) dup2(stdout_pipe[1], STDOUT_FILENO);
1620 (void) dup2(stderr_pipe[1], STDERR_FILENO);
1621 (void) closefrom(STDERR_FILENO + 1);
1622
1623 (void) sigset(SIGCLD, SIG_DFL);
1624 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
1625 /*
1626 * In case any of stdin, stdout or stderr are streams,
1627 * anchor them to prevent malicious I_POPs.
1628 */
1629 (void) ioctl(STDIN_FILENO, I_ANCHOR);
1630 (void) ioctl(STDOUT_FILENO, I_ANCHOR);
1631 (void) ioctl(STDERR_FILENO, I_ANCHOR);
1632
1633 if (zone_enter(zoneid) == -1) {
1634 zerror(gettext("could not enter zone %s: %s"),
1635 zonename, strerror(errno));
1636 _exit(1);
1637 }
1638
1639 /*
1640 * For non-native zones, tell libc where it can find locale
1641 * specific getttext() messages.
1642 */
1643 if (access("/.SUNWnative/usr/lib/locale", R_OK) == 0)
1644 (void) bindtextdomain(TEXT_DOMAIN,
1645 "/.SUNWnative/usr/lib/locale");
1646 else if (access("/native/usr/lib/locale", R_OK) == 0)
1647 (void) bindtextdomain(TEXT_DOMAIN,
1648 "/native/usr/lib/locale");
1649
1650 if (!failsafe)
1651 new_env = prep_env_noninteractive(user_cmd, new_env);
1652
1653 if (new_env == NULL) {
1654 _exit(1);
1655 }
1656
1657 /*
1658 * Move into a new process group; the zone_enter will have
1659 * placed us into zsched's session, and we want to be in
1660 * a unique process group.
1661 */
1662 (void) setpgid(getpid(), getpid());
1663
1664 /*
1665 * The child needs to run as root to
1666 * execute the su program.
1667 */
1668 if (setuid(0) == -1) {
1669 zperror(gettext("insufficient privilege"));
1670 return (1);
1671 }
1672
1673 (void) execve(new_args[0], new_args, new_env);
1674 zperror(gettext("exec failure"));
1675 _exit(1);
1676 }
1677 /* parent */
1678
1679 /* close pipe sides written by child */
1680 (void) close(stdout_pipe[1]);
1681 (void) close(stderr_pipe[1]);
1682
1683 (void) sigset(SIGINT, sig_forward);
1684
1685 postfork_dropprivs();
1686
1687 (void) ct_tmpl_clear(tmpl_fd);
1688 (void) close(tmpl_fd);
1689
1690 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
1691 doio(stdin_pipe[0], stdin_pipe[1], stdout_pipe[0], stderr_pipe[0],
1692 dead_child_pipe[1], B_TRUE);
1693 do {
1694 retval = waitpid(child_pid, &child_status, 0);
1695 if (retval == -1) {
1696 child_status = 0;
1697 }
1698 } while (retval != child_pid && errno != ECHILD);
1699
1700 return (WEXITSTATUS(child_status));
1701 }
1702
1703 static char *
1704 get_username()
1705 {
1706 uid_t uid;
1707 struct passwd *nptr;
1708
1709 /*
1710 * Authorizations are checked to restrict access based on the
1711 * requested operation and zone name, It is assumed that the
1712 * program is running with all privileges, but that the real
1713 * user ID is that of the user or role on whose behalf we are
1714 * operating. So we start by getting the username that will be
1715 * used for subsequent authorization checks.
1716 */
1717
1718 uid = getuid();
1719 if ((nptr = getpwuid(uid)) == NULL) {
1720 zerror(gettext("could not get user name."));
1721 _exit(1);
1722 }
1723 return (nptr->pw_name);
1724 }
1725
1726 int
1727 main(int argc, char **argv)
1728 {
1729 int arg, console = 0;
1730 zoneid_t zoneid;
1731 zone_state_t st;
1732 char *login = "root";
1733 int lflag = 0;
1734 int nflag = 0;
1735 char *zonename = NULL;
1736 char **proc_args = NULL;
1737 char **new_args, **new_env;
1738 sigset_t block_cld;
1739 char devroot[MAXPATHLEN];
1740 char *slavename, slaveshortname[MAXPATHLEN];
1741 priv_set_t *privset;
1742 int tmpl_fd;
1743 char zonebrand[MAXNAMELEN];
1744 char default_brand[MAXNAMELEN];
1745 struct stat sb;
1746 char kernzone[ZONENAME_MAX];
1747 brand_handle_t bh;
1748 char user_cmd[MAXPATHLEN];
1749 char authname[MAXAUTHS];
1750
1751 (void) setlocale(LC_ALL, "");
1752 (void) textdomain(TEXT_DOMAIN);
1753
1754 (void) getpname(argv[0]);
1755 username = get_username();
1756
1757 while ((arg = getopt(argc, argv, "nECR:Se:l:Q")) != EOF) {
1758 switch (arg) {
1759 case 'C':
1760 console = 1;
1761 break;
1762 case 'E':
1763 nocmdchar = 1;
1764 break;
1765 case 'R': /* undocumented */
1766 if (*optarg != '/') {
1767 zerror(gettext("root path must be absolute."));
1768 exit(2);
1769 }
1770 if (stat(optarg, &sb) == -1 || !S_ISDIR(sb.st_mode)) {
1771 zerror(
1772 gettext("root path must be a directory."));
1773 exit(2);
1774 }
1775 zonecfg_set_root(optarg);
1776 break;
1777 case 'Q':
1778 quiet = 1;
1779 break;
1780 case 'S':
1781 failsafe = 1;
1782 break;
1783 case 'e':
1784 set_cmdchar(optarg);
1785 break;
1786 case 'l':
1787 login = optarg;
1788 lflag = 1;
1789 break;
1790 case 'n':
1791 nflag = 1;
1792 break;
1793 default:
1794 usage();
1795 }
1796 }
1797
1798 if (console != 0) {
1799
1800 if (lflag != 0) {
1801 zerror(gettext(
1802 "-l may not be specified for console login"));
1803 usage();
1804 }
1805
1806 if (nflag != 0) {
1807 zerror(gettext(
1808 "-n may not be specified for console login"));
1809 usage();
1810 }
1811
1812 if (failsafe != 0) {
1813 zerror(gettext(
1814 "-S may not be specified for console login"));
1815 usage();
1816 }
1817
1818 if (zonecfg_in_alt_root()) {
1819 zerror(gettext(
1820 "-R may not be specified for console login"));
1821 exit(2);
1822 }
1823
1824 }
1825
1826 if (failsafe != 0 && lflag != 0) {
1827 zerror(gettext("-l may not be specified for failsafe login"));
1828 usage();
1829 }
1830
1831 if (optind == (argc - 1)) {
1832 /*
1833 * zone name, no process name; this should be an interactive
1834 * as long as STDIN is really a tty.
1835 */
1836 if (nflag != 0) {
1837 zerror(gettext(
1838 "-n may not be specified for interactive login"));
1839 usage();
1840 }
1841 if (isatty(STDIN_FILENO))
1842 interactive = 1;
1843 zonename = argv[optind];
1844 } else if (optind < (argc - 1)) {
1845 if (console) {
1846 zerror(gettext("Commands may not be specified for "
1847 "console login."));
1848 usage();
1849 }
1850 /* zone name and process name, and possibly some args */
1851 zonename = argv[optind];
1852 proc_args = &argv[optind + 1];
1853 interactive = 0;
1854 } else {
1855 usage();
1856 }
1857
1858 if (getzoneid() != GLOBAL_ZONEID) {
1859 zerror(gettext("'%s' may only be used from the global zone"),
1860 pname);
1861 return (1);
1862 }
1863
1864 if (strcmp(zonename, GLOBAL_ZONENAME) == 0) {
1865 zerror(gettext("'%s' not applicable to the global zone"),
1866 pname);
1867 return (1);
1868 }
1869
1870 if (zone_get_state(zonename, &st) != Z_OK) {
1871 zerror(gettext("zone '%s' unknown"), zonename);
1872 return (1);
1873 }
1874
1875 if (st < ZONE_STATE_INSTALLED) {
1876 zerror(gettext("cannot login to a zone which is '%s'"),
1877 zone_state_str(st));
1878 return (1);
1879 }
1880
1881 /*
1882 * In both console and non-console cases, we require all privs.
1883 * In the console case, because we may need to startup zoneadmd.
1884 * In the non-console case in order to do zone_enter(2), zonept()
1885 * and other tasks.
1886 */
1887
1888 if ((privset = priv_allocset()) == NULL) {
1889 zperror(gettext("priv_allocset failed"));
1890 return (1);
1891 }
1892
1893 if (getppriv(PRIV_EFFECTIVE, privset) != 0) {
1894 zperror(gettext("getppriv failed"));
1895 priv_freeset(privset);
1896 return (1);
1897 }
1898
1899 if (priv_isfullset(privset) == B_FALSE) {
1900 zerror(gettext("You lack sufficient privilege to run "
1901 "this command (all privs required)"));
1902 priv_freeset(privset);
1903 return (1);
1904 }
1905 priv_freeset(privset);
1906
1907 /*
1908 * Check if user is authorized for requested usage of the zone
1909 */
1910
1911 (void) snprintf(authname, MAXAUTHS, "%s%s%s",
1912 ZONE_MANAGE_AUTH, KV_OBJECT, zonename);
1913 if (chkauthattr(authname, username) == 0) {
1914 if (console) {
1915 zerror(gettext("%s is not authorized for console "
1916 "access to %s zone."),
1917 username, zonename);
1918 return (1);
1919 } else {
1920 (void) snprintf(authname, MAXAUTHS, "%s%s%s",
1921 ZONE_LOGIN_AUTH, KV_OBJECT, zonename);
1922 if (failsafe || !interactive) {
1923 zerror(gettext("%s is not authorized for "
1924 "failsafe or non-interactive login "
1925 "to %s zone."), username, zonename);
1926 return (1);
1927 } else if (chkauthattr(authname, username) == 0) {
1928 zerror(gettext("%s is not authorized "
1929 " to login to %s zone."),
1930 username, zonename);
1931 return (1);
1932 }
1933 }
1934 } else {
1935 forced_login = B_TRUE;
1936 }
1937
1938 /*
1939 * The console is a separate case from the rest of the code; handle
1940 * it first.
1941 */
1942 if (console) {
1943 /*
1944 * Ensure that zoneadmd for this zone is running.
1945 */
1946 if (start_zoneadmd(zonename) == -1)
1947 return (1);
1948
1949 /*
1950 * Make contact with zoneadmd.
1951 */
1952 if (get_console_master(zonename) == -1)
1953 return (1);
1954
1955 if (!quiet)
1956 (void) printf(
1957 gettext("[Connected to zone '%s' console]\n"),
1958 zonename);
1959
1960 if (set_tty_rawmode(STDIN_FILENO) == -1) {
1961 reset_tty();
1962 zperror(gettext("failed to set stdin pty to raw mode"));
1963 return (1);
1964 }
1965
1966 (void) sigset(SIGWINCH, sigwinch);
1967 (void) sigwinch(0);
1968
1969 /*
1970 * Run the I/O loop until we get disconnected.
1971 */
1972 doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
1973 reset_tty();
1974 if (!quiet)
1975 (void) printf(
1976 gettext("\n[Connection to zone '%s' console "
1977 "closed]\n"), zonename);
1978
1979 return (0);
1980 }
1981
1982 if (st != ZONE_STATE_RUNNING && st != ZONE_STATE_MOUNTED) {
1983 zerror(gettext("login allowed only to running zones "
1984 "(%s is '%s')."), zonename, zone_state_str(st));
1985 return (1);
1986 }
1987
1988 (void) strlcpy(kernzone, zonename, sizeof (kernzone));
1989 if (zonecfg_in_alt_root()) {
1990 FILE *fp = zonecfg_open_scratch("", B_FALSE);
1991
1992 if (fp == NULL || zonecfg_find_scratch(fp, zonename,
1993 zonecfg_get_root(), kernzone, sizeof (kernzone)) == -1) {
1994 zerror(gettext("cannot find scratch zone %s"),
1995 zonename);
1996 if (fp != NULL)
1997 zonecfg_close_scratch(fp);
1998 return (1);
1999 }
2000 zonecfg_close_scratch(fp);
2001 }
2002
2003 if ((zoneid = getzoneidbyname(kernzone)) == -1) {
2004 zerror(gettext("failed to get zoneid for zone '%s'"),
2005 zonename);
2006 return (1);
2007 }
2008
2009 /*
2010 * We need the zone root path only if we are setting up a pty.
2011 */
2012 if (zone_get_devroot(zonename, devroot, sizeof (devroot)) == -1) {
2013 zerror(gettext("could not get dev path for zone %s"),
2014 zonename);
2015 return (1);
2016 }
2017
2018 if (zone_get_brand(zonename, zonebrand, sizeof (zonebrand)) != Z_OK) {
2019 zerror(gettext("could not get brand for zone %s"), zonename);
2020 return (1);
2021 }
2022 /*
2023 * In the alternate root environment, the only supported
2024 * operations are mount and unmount. In this case, just treat
2025 * the zone as native if it is cluster. Cluster zones can be
2026 * native for the purpose of LU or upgrade, and the cluster
2027 * brand may not exist in the miniroot (such as in net install
2028 * upgrade).
2029 */
2030 if (zonecfg_default_brand(default_brand,
2031 sizeof (default_brand)) != Z_OK) {
2032 zerror(gettext("unable to determine default brand"));
2033 return (1);
2034 }
2035 if (zonecfg_in_alt_root() &&
2036 strcmp(zonebrand, CLUSTER_BRAND_NAME) == 0) {
2037 (void) strlcpy(zonebrand, default_brand, sizeof (zonebrand));
2038 }
2039
2040 if ((bh = brand_open(zonebrand)) == NULL) {
2041 zerror(gettext("could not open brand for zone %s"), zonename);
2042 return (1);
2043 }
2044
2045 if ((new_args = prep_args(bh, login, proc_args)) == NULL) {
2046 zperror(gettext("could not assemble new arguments"));
2047 brand_close(bh);
2048 return (1);
2049 }
2050 /*
2051 * Get the brand specific user_cmd. This command is used to get
2052 * a passwd(4) entry for login.
2053 */
2054 if (!interactive && !failsafe) {
2055 if (zone_get_user_cmd(bh, login, user_cmd,
2056 sizeof (user_cmd)) == NULL) {
2057 zerror(gettext("could not get user_cmd for zone %s"),
2058 zonename);
2059 brand_close(bh);
2060 return (1);
2061 }
2062 }
2063 brand_close(bh);
2064
2065 if ((new_env = prep_env()) == NULL) {
2066 zperror(gettext("could not assemble new environment"));
2067 return (1);
2068 }
2069
2070 if (!interactive) {
2071 if (nflag) {
2072 int nfd;
2073
2074 if ((nfd = open(_PATH_DEVNULL, O_RDONLY)) < 0) {
2075 zperror(gettext("failed to open null device"));
2076 return (1);
2077 }
2078 if (nfd != STDIN_FILENO) {
2079 if (dup2(nfd, STDIN_FILENO) < 0) {
2080 zperror(gettext(
2081 "failed to dup2 null device"));
2082 return (1);
2083 }
2084 (void) close(nfd);
2085 }
2086 /* /dev/null is now standard input */
2087 }
2088 return (noninteractive_login(zonename, user_cmd, zoneid,
2089 new_args, new_env));
2090 }
2091
2092 if (zonecfg_in_alt_root()) {
2093 zerror(gettext("cannot use interactive login with scratch "
2094 "zone"));
2095 return (1);
2096 }
2097
2098 /*
2099 * Things are more complex in interactive mode; we get the
2100 * master side of the pty, then place the user's terminal into
2101 * raw mode.
2102 */
2103 if (get_master_pty() == -1) {
2104 zerror(gettext("could not setup master pty device"));
2105 return (1);
2106 }
2107
2108 /*
2109 * Compute the "short name" of the pts. /dev/pts/2 --> pts/2
2110 */
2111 if ((slavename = ptsname(masterfd)) == NULL) {
2112 zperror(gettext("failed to get name for pseudo-tty"));
2113 return (1);
2114 }
2115 if (strncmp(slavename, "/dev/", strlen("/dev/")) == 0)
2116 (void) strlcpy(slaveshortname, slavename + strlen("/dev/"),
2117 sizeof (slaveshortname));
2118 else
2119 (void) strlcpy(slaveshortname, slavename,
2120 sizeof (slaveshortname));
2121
2122 if (!quiet)
2123 (void) printf(gettext("[Connected to zone '%s' %s]\n"),
2124 zonename, slaveshortname);
2125
2126 if (set_tty_rawmode(STDIN_FILENO) == -1) {
2127 reset_tty();
2128 zperror(gettext("failed to set stdin pty to raw mode"));
2129 return (1);
2130 }
2131
2132 if (prefork_dropprivs() != 0) {
2133 reset_tty();
2134 zperror(gettext("could not allocate privilege set"));
2135 return (1);
2136 }
2137
2138 /*
2139 * We must mask SIGCLD until after we have coped with the fork
2140 * sufficiently to deal with it; otherwise we can race and receive the
2141 * signal before child_pid has been initialized (yes, this really
2142 * happens).
2143 */
2144 (void) sigset(SIGCLD, sigcld);
2145 (void) sigemptyset(&block_cld);
2146 (void) sigaddset(&block_cld, SIGCLD);
2147 (void) sigprocmask(SIG_BLOCK, &block_cld, NULL);
2148
2149 /*
2150 * We activate the contract template at the last minute to
2151 * avoid intermediate functions that could be using fork(2)
2152 * internally.
2153 */
2154 if ((tmpl_fd = init_template()) == -1) {
2155 reset_tty();
2156 zperror(gettext("could not create contract"));
2157 return (1);
2158 }
2159
2160 if ((child_pid = fork()) == -1) {
2161 (void) ct_tmpl_clear(tmpl_fd);
2162 reset_tty();
2163 zperror(gettext("could not fork"));
2164 return (1);
2165 } else if (child_pid == 0) { /* child process */
2166 int slavefd, newslave;
2167
2168 (void) ct_tmpl_clear(tmpl_fd);
2169 (void) close(tmpl_fd);
2170
2171 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
2172
2173 if ((slavefd = init_slave_pty(zoneid, devroot)) == -1)
2174 return (1);
2175
2176 /*
2177 * Close all fds except for the slave pty.
2178 */
2179 (void) fdwalk(close_func, &slavefd);
2180
2181 /*
2182 * Temporarily dup slavefd to stderr; that way if we have
2183 * to print out that zone_enter failed, the output will
2184 * have somewhere to go.
2185 */
2186 if (slavefd != STDERR_FILENO)
2187 (void) dup2(slavefd, STDERR_FILENO);
2188
2189 if (zone_enter(zoneid) == -1) {
2190 zerror(gettext("could not enter zone %s: %s"),
2191 zonename, strerror(errno));
2192 return (1);
2193 }
2194
2195 if (slavefd != STDERR_FILENO)
2196 (void) close(STDERR_FILENO);
2197
2198 /*
2199 * We take pains to get this process into a new process
2200 * group, and subsequently a new session. In this way,
2201 * we'll have a session which doesn't yet have a controlling
2202 * terminal. When we open the slave, it will become the
2203 * controlling terminal; no PIDs concerning pgrps or sids
2204 * will leak inappropriately into the zone.
2205 */
2206 (void) setpgrp();
2207
2208 /*
2209 * We need the slave pty to be referenced from the zone's
2210 * /dev in order to ensure that the devt's, etc are all
2211 * correct. Otherwise we break ttyname and the like.
2212 */
2213 if ((newslave = open(slavename, O_RDWR)) == -1) {
2214 (void) close(slavefd);
2215 return (1);
2216 }
2217 (void) close(slavefd);
2218 slavefd = newslave;
2219
2220 /*
2221 * dup the slave to the various FDs, so that when the
2222 * spawned process does a write/read it maps to the slave
2223 * pty.
2224 */
2225 (void) dup2(slavefd, STDIN_FILENO);
2226 (void) dup2(slavefd, STDOUT_FILENO);
2227 (void) dup2(slavefd, STDERR_FILENO);
2228 if (slavefd != STDIN_FILENO && slavefd != STDOUT_FILENO &&
2229 slavefd != STDERR_FILENO) {
2230 (void) close(slavefd);
2231 }
2232
2233 /*
2234 * In failsafe mode, we don't use login(1), so don't try
2235 * setting up a utmpx entry.
2236 */
2237 if (!failsafe)
2238 if (setup_utmpx(slaveshortname) == -1)
2239 return (1);
2240
2241 /*
2242 * The child needs to run as root to
2243 * execute the brand's login program.
2244 */
2245 if (setuid(0) == -1) {
2246 zperror(gettext("insufficient privilege"));
2247 return (1);
2248 }
2249
2250 (void) execve(new_args[0], new_args, new_env);
2251 zperror(gettext("exec failure"));
2252 return (1);
2253 }
2254
2255 (void) ct_tmpl_clear(tmpl_fd);
2256 (void) close(tmpl_fd);
2257
2258 /*
2259 * The rest is only for the parent process.
2260 */
2261 (void) sigset(SIGWINCH, sigwinch);
2262
2263 postfork_dropprivs();
2264
2265 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
2266 doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
2267
2268 reset_tty();
2269 if (!quiet)
2270 (void) fprintf(stderr,
2271 gettext("\n[Connection to zone '%s' %s closed]\n"),
2272 zonename, slaveshortname);
2273
2274 if (pollerr != 0) {
2275 (void) fprintf(stderr, gettext("Error: connection closed due "
2276 "to unexpected pollevents=0x%x.\n"), pollerr);
2277 return (1);
2278 }
2279
2280 return (0);
2281 }