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 * Copyright 2015 Nexenta Systems, Inc. All rights reserved.
26 * Copyright 2019 Joyent, Inc.
27 * Copyright 2020 OmniOS Community Edition (OmniOSce) Association.
28 */
29
30 /*
31 * zlogin provides three types of login which allow users in the global
32 * zone to access non-global zones.
33 *
34 * - "interactive login" is similar to rlogin(1); for example, the user could
35 * issue 'zlogin my-zone' or 'zlogin -e ^ -l me my-zone'. The user is
36 * granted a new pty (which is then shoved into the zone), and an I/O
37 * loop between parent and child processes takes care of the interactive
38 * session. In this mode, login(1) (and its -c option, which means
39 * "already authenticated") is employed to take care of the initialization
40 * of the user's session.
41 *
42 * - "non-interactive login" is similar to su(1M); the user could issue
43 * 'zlogin my-zone ls -l' and the command would be run as specified.
44 * In this mode, zlogin sets up pipes as the communication channel, and
45 * 'su' is used to do the login setup work.
46 *
47 * - "console login" is the equivalent to accessing the tip line for a
48 * zone. For example, the user can issue 'zlogin -C my-zone'.
49 * In this mode, zlogin contacts the zoneadmd process via unix domain
50 * socket. If zoneadmd is not running, it starts it. This allows the
51 * console to be available anytime the zone is installed, regardless of
52 * whether it is running.
53 */
54
55 #include <sys/socket.h>
56 #include <sys/termios.h>
57 #include <sys/utsname.h>
58 #include <sys/stat.h>
59 #include <sys/types.h>
60 #include <sys/contract/process.h>
61 #include <sys/ctfs.h>
62 #include <sys/brand.h>
63 #include <sys/wait.h>
64 #include <alloca.h>
65 #include <assert.h>
66 #include <ctype.h>
67 #include <paths.h>
68 #include <door.h>
69 #include <errno.h>
70 #include <nss_dbdefs.h>
71 #include <poll.h>
72 #include <priv.h>
73 #include <pwd.h>
74 #include <unistd.h>
75 #include <utmpx.h>
76 #include <sac.h>
77 #include <signal.h>
78 #include <stdarg.h>
79 #include <stdio.h>
80 #include <stdlib.h>
81 #include <string.h>
82 #include <strings.h>
83 #include <stropts.h>
84 #include <wait.h>
85 #include <zone.h>
86 #include <fcntl.h>
87 #include <libdevinfo.h>
88 #include <libintl.h>
89 #include <locale.h>
90 #include <libzonecfg.h>
91 #include <libcontract.h>
92 #include <libbrand.h>
93 #include <auth_list.h>
94 #include <auth_attr.h>
95 #include <secdb.h>
96
97 static int masterfd;
98 static struct termios save_termios;
99 static struct termios effective_termios;
100 static int save_fd;
101 static struct winsize winsize;
102 static volatile int dead;
103 static volatile pid_t child_pid = -1;
104 static int interactive = 0;
105 static priv_set_t *dropprivs;
106
107 static int nocmdchar = 0;
108 static int failsafe = 0;
109 static int disconnect = 0;
110 static char cmdchar = '~';
111 static int quiet = 0;
112
113 static int pollerr = 0;
114
115 static const char *pname;
116 static char *username;
117
118 /*
119 * When forced_login is true, the user is not prompted
120 * for an authentication password in the target zone.
121 */
122 static boolean_t forced_login = B_FALSE;
123
124 #if !defined(TEXT_DOMAIN) /* should be defined by cc -D */
125 #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it wasn't */
126 #endif
127
128 #define SUPATH "/usr/bin/su"
129 #define FAILSAFESHELL "/sbin/sh"
130 #define DEFAULTSHELL "/sbin/sh"
131 #define DEF_PATH "/usr/sbin:/usr/bin"
132
133 #define CLUSTER_BRAND_NAME "cluster"
134
135 /*
136 * The ZLOGIN_BUFSIZ is larger than PIPE_BUF so we can be sure we're clearing
137 * out the pipe when the child is exiting. The ZLOGIN_RDBUFSIZ must be less
138 * than ZLOGIN_BUFSIZ (because we share the buffer in doio). This value is
139 * also chosen in conjunction with the HI_WATER setting to make sure we
140 * don't fill up the pipe. We can write FIFOHIWAT (16k) into the pipe before
141 * blocking. By having ZLOGIN_RDBUFSIZ set to 1k and HI_WATER set to 8k, we
142 * know we can always write a ZLOGIN_RDBUFSIZ chunk into the pipe when there
143 * is less than HI_WATER data already in the pipe.
144 */
145 #define ZLOGIN_BUFSIZ 8192
146 #define ZLOGIN_RDBUFSIZ 1024
147 #define HI_WATER 8192
148
149 /*
150 * See canonify() below. CANONIFY_LEN is the maximum length that a
151 * "canonical" sequence will expand to (backslash, three octal digits, NUL).
152 */
153 #define CANONIFY_LEN 5
154
155 static void
156 usage(void)
157 {
158 (void) fprintf(stderr, gettext("usage: %s [ -dnQCES ] [ -e cmdchar ] "
159 "[-l user] zonename [command [args ...] ]\n"), pname);
160 exit(2);
161 }
162
163 static const char *
164 getpname(const char *arg0)
165 {
166 const char *p = strrchr(arg0, '/');
167
168 if (p == NULL)
169 p = arg0;
170 else
171 p++;
172
173 pname = p;
174 return (p);
175 }
176
177 static void
178 zerror(const char *fmt, ...)
179 {
180 va_list alist;
181
182 (void) fprintf(stderr, "%s: ", pname);
183 va_start(alist, fmt);
184 (void) vfprintf(stderr, fmt, alist);
185 va_end(alist);
186 (void) fprintf(stderr, "\n");
187 }
188
189 static void
190 zperror(const char *str)
191 {
192 const char *estr;
193
194 if ((estr = strerror(errno)) != NULL)
195 (void) fprintf(stderr, "%s: %s: %s\n", pname, str, estr);
196 else
197 (void) fprintf(stderr, "%s: %s: errno %d\n", pname, str, errno);
198 }
199
200 /*
201 * The first part of our privilege dropping scheme needs to be called before
202 * fork(), since we must have it for security; we don't want to be surprised
203 * later that we couldn't allocate the privset.
204 */
205 static int
206 prefork_dropprivs()
207 {
208 if ((dropprivs = priv_allocset()) == NULL)
209 return (1);
210
211 priv_basicset(dropprivs);
212 (void) priv_delset(dropprivs, PRIV_PROC_INFO);
213 (void) priv_delset(dropprivs, PRIV_PROC_FORK);
214 (void) priv_delset(dropprivs, PRIV_PROC_EXEC);
215 (void) priv_delset(dropprivs, PRIV_FILE_LINK_ANY);
216
217 /*
218 * We need to keep the basic privilege PROC_SESSION and all unknown
219 * basic privileges as well as the privileges PROC_ZONE and
220 * PROC_OWNER in order to query session information and
221 * send signals.
222 */
223 if (interactive == 0) {
224 (void) priv_addset(dropprivs, PRIV_PROC_ZONE);
225 (void) priv_addset(dropprivs, PRIV_PROC_OWNER);
226 } else {
227 (void) priv_delset(dropprivs, PRIV_PROC_SESSION);
228 }
229
230 return (0);
231 }
232
233 /*
234 * The second part of the privilege drop. We are paranoid about being attacked
235 * by the zone, so we drop all privileges. This should prevent a compromise
236 * which gets us to fork(), exec(), symlink(), etc.
237 */
238 static void
239 postfork_dropprivs()
240 {
241 if ((setppriv(PRIV_SET, PRIV_PERMITTED, dropprivs)) == -1) {
242 zperror(gettext("Warning: could not set permitted privileges"));
243 }
244 if ((setppriv(PRIV_SET, PRIV_LIMIT, dropprivs)) == -1) {
245 zperror(gettext("Warning: could not set limit privileges"));
246 }
247 if ((setppriv(PRIV_SET, PRIV_INHERITABLE, dropprivs)) == -1) {
248 zperror(gettext("Warning: could not set inheritable "
249 "privileges"));
250 }
251 }
252
253 /*
254 * Create the unix domain socket and call the zoneadmd server; handshake
255 * with it to determine whether it will allow us to connect.
256 */
257 static int
258 get_console_master(const char *zname)
259 {
260 int sockfd = -1;
261 struct sockaddr_un servaddr;
262 char clientid[MAXPATHLEN];
263 char handshake[MAXPATHLEN], c;
264 int msglen;
265 int i = 0, err = 0;
266
267 if ((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
268 zperror(gettext("could not create socket"));
269 return (-1);
270 }
271
272 bzero(&servaddr, sizeof (servaddr));
273 servaddr.sun_family = AF_UNIX;
274 (void) snprintf(servaddr.sun_path, sizeof (servaddr.sun_path),
275 "%s/%s.console_sock", ZONES_TMPDIR, zname);
276
277 if (connect(sockfd, (struct sockaddr *)&servaddr,
278 sizeof (servaddr)) == -1) {
279 zperror(gettext("Could not connect to zone console"));
280 goto bad;
281 }
282 masterfd = sockfd;
283
284 msglen = snprintf(clientid, sizeof (clientid), "IDENT %lu %s %d\n",
285 getpid(), setlocale(LC_MESSAGES, NULL), disconnect);
286
287 if (msglen >= sizeof (clientid) || msglen < 0) {
288 zerror("protocol error");
289 goto bad;
290 }
291
292 if (write(masterfd, clientid, msglen) != msglen) {
293 zerror("protocol error");
294 goto bad;
295 }
296
297 bzero(handshake, sizeof (handshake));
298
299 /*
300 * Take care not to accumulate more than our fill, and leave room for
301 * the NUL at the end.
302 */
303 while ((err = read(masterfd, &c, 1)) == 1) {
304 if (i >= (sizeof (handshake) - 1))
305 break;
306 if (c == '\n')
307 break;
308 handshake[i] = c;
309 i++;
310 }
311
312 /*
313 * If something went wrong during the handshake we bail; perhaps
314 * the server died off.
315 */
316 if (err == -1) {
317 zperror(gettext("Could not connect to zone console"));
318 goto bad;
319 }
320
321 if (strncmp(handshake, "OK", sizeof (handshake)) == 0)
322 return (0);
323
324 zerror(gettext("Console is already in use by process ID %s."),
325 handshake);
326 bad:
327 (void) close(sockfd);
328 masterfd = -1;
329 return (-1);
330 }
331
332
333 /*
334 * Routines to handle pty creation upon zone entry and to shuttle I/O back
335 * and forth between the two terminals. We also compute and store the
336 * name of the slave terminal associated with the master side.
337 */
338 static int
339 get_master_pty()
340 {
341 if ((masterfd = open("/dev/ptmx", O_RDWR|O_NONBLOCK)) < 0) {
342 zperror(gettext("failed to obtain a pseudo-tty"));
343 return (-1);
344 }
345 if (tcgetattr(STDIN_FILENO, &save_termios) == -1) {
346 zperror(gettext("failed to get terminal settings from stdin"));
347 return (-1);
348 }
349 (void) ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&winsize);
350
351 return (0);
352 }
353
354 /*
355 * This is a bit tricky; normally a pts device will belong to the zone it
356 * is granted to. But in the case of "entering" a zone, we need to establish
357 * the pty before entering the zone so that we can vector I/O to and from it
358 * from the global zone.
359 *
360 * We use the zonept() call to let the ptm driver know what we are up to;
361 * the only other hairy bit is the setting of zoneslavename (which happens
362 * above, in get_master_pty()).
363 */
364 static int
365 init_slave_pty(zoneid_t zoneid, char *devroot)
366 {
367 int slavefd = -1;
368 char *slavename, zoneslavename[MAXPATHLEN];
369
370 /*
371 * Set slave permissions, zone the pts, then unlock it.
372 */
373 if (grantpt(masterfd) != 0) {
374 zperror(gettext("grantpt failed"));
375 return (-1);
376 }
377
378 if (unlockpt(masterfd) != 0) {
379 zperror(gettext("unlockpt failed"));
380 return (-1);
381 }
382
383 /*
384 * We must open the slave side before zoning this pty; otherwise
385 * the kernel would refuse us the open-- zoning a pty makes it
386 * inaccessible to the global zone. Note we are trying to open
387 * the device node via the $ZONEROOT/dev path for this pty.
388 *
389 * Later we'll close the slave out when once we've opened it again
390 * from within the target zone. Blarg.
391 */
392 if ((slavename = ptsname(masterfd)) == NULL) {
393 zperror(gettext("failed to get name for pseudo-tty"));
394 return (-1);
395 }
396
397 (void) snprintf(zoneslavename, sizeof (zoneslavename), "%s%s",
398 devroot, slavename);
399
400 if ((slavefd = open(zoneslavename, O_RDWR)) < 0) {
401 zerror(gettext("failed to open %s: %s"), zoneslavename,
402 strerror(errno));
403 return (-1);
404 }
405
406 /*
407 * Push hardware emulation (ptem), line discipline (ldterm),
408 * and V7/4BSD/Xenix compatibility (ttcompat) modules.
409 */
410 if (ioctl(slavefd, I_PUSH, "ptem") == -1) {
411 zperror(gettext("failed to push ptem module"));
412 if (!failsafe)
413 goto bad;
414 }
415
416 /*
417 * Anchor the stream to prevent malicious I_POPs; we prefer to do
418 * this prior to entering the zone so that we can detect any errors
419 * early, and so that we can set the anchor from the global zone.
420 */
421 if (ioctl(slavefd, I_ANCHOR) == -1) {
422 zperror(gettext("failed to set stream anchor"));
423 if (!failsafe)
424 goto bad;
425 }
426
427 if (ioctl(slavefd, I_PUSH, "ldterm") == -1) {
428 zperror(gettext("failed to push ldterm module"));
429 if (!failsafe)
430 goto bad;
431 }
432 if (ioctl(slavefd, I_PUSH, "ttcompat") == -1) {
433 zperror(gettext("failed to push ttcompat module"));
434 if (!failsafe)
435 goto bad;
436 }
437
438 /*
439 * Propagate terminal settings from the external term to the new one.
440 */
441 if (tcsetattr(slavefd, TCSAFLUSH, &save_termios) == -1) {
442 zperror(gettext("failed to set terminal settings"));
443 if (!failsafe)
444 goto bad;
445 }
446 (void) ioctl(slavefd, TIOCSWINSZ, (char *)&winsize);
447
448 if (zonept(masterfd, zoneid) != 0) {
449 zperror(gettext("could not set zoneid of pty"));
450 goto bad;
451 }
452
453 return (slavefd);
454
455 bad:
456 (void) close(slavefd);
457 return (-1);
458 }
459
460 /*
461 * Place terminal into raw mode.
462 */
463 static int
464 set_tty_rawmode(int fd)
465 {
466 struct termios term;
467 if (tcgetattr(fd, &term) < 0) {
468 zperror(gettext("failed to get user terminal settings"));
469 return (-1);
470 }
471
472 /* Stash for later, so we can revert back to previous mode */
473 save_termios = term;
474 save_fd = fd;
475
476 /* disable 8->7 bit strip, start/stop, enable any char to restart */
477 term.c_iflag &= ~(ISTRIP|IXON|IXANY);
478 /* disable NL->CR, CR->NL, ignore CR, UPPER->lower */
479 term.c_iflag &= ~(INLCR|ICRNL|IGNCR|IUCLC);
480 /* disable output post-processing */
481 term.c_oflag &= ~OPOST;
482 /* disable canonical mode, signal chars, echo & extended functions */
483 term.c_lflag &= ~(ICANON|ISIG|ECHO|IEXTEN);
484
485 term.c_cc[VMIN] = 1; /* byte-at-a-time */
486 term.c_cc[VTIME] = 0;
487
488 if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &term)) {
489 zperror(gettext("failed to set user terminal to raw mode"));
490 return (-1);
491 }
492
493 /*
494 * We need to know the value of VEOF so that we can properly process for
495 * client-side ~<EOF>. But we have obliterated VEOF in term,
496 * because VMIN overloads the same array slot in non-canonical mode.
497 * Stupid @&^%!
498 *
499 * So here we construct the "effective" termios from the current
500 * terminal settings, and the corrected VEOF and VEOL settings.
501 */
502 if (tcgetattr(STDIN_FILENO, &effective_termios) < 0) {
503 zperror(gettext("failed to get user terminal settings"));
504 return (-1);
505 }
506 effective_termios.c_cc[VEOF] = save_termios.c_cc[VEOF];
507 effective_termios.c_cc[VEOL] = save_termios.c_cc[VEOL];
508
509 return (0);
510 }
511
512 /*
513 * Copy terminal window size from our terminal to the pts.
514 */
515 /*ARGSUSED*/
516 static void
517 sigwinch(int s)
518 {
519 struct winsize ws;
520
521 if (ioctl(0, TIOCGWINSZ, &ws) == 0)
522 (void) ioctl(masterfd, TIOCSWINSZ, &ws);
523 }
524
525 static volatile int close_on_sig = -1;
526
527 static void
528 /*ARGSUSED*/
529 sigcld(int s)
530 {
531 int status;
532 pid_t pid;
533
534 /*
535 * Peek at the exit status. If this isn't the process we cared
536 * about, then just reap it.
537 */
538 if ((pid = waitpid(child_pid, &status, WNOHANG|WNOWAIT)) != -1) {
539 if (pid == child_pid &&
540 (WIFEXITED(status) || WIFSIGNALED(status))) {
541 dead = 1;
542 if (close_on_sig != -1) {
543 (void) write(close_on_sig, "a", 1);
544 (void) close(close_on_sig);
545 close_on_sig = -1;
546 }
547 } else {
548 (void) waitpid(pid, &status, WNOHANG);
549 }
550 }
551 }
552
553 /*
554 * Some signals (currently, SIGINT) must be forwarded on to the process
555 * group of the child process.
556 */
557 static void
558 sig_forward(int s)
559 {
560 if (child_pid != -1) {
561 (void) sigsend(P_PGID, child_pid, s);
562 }
563 }
564
565 /*
566 * reset terminal settings for global environment
567 */
568 static void
569 reset_tty()
570 {
571 (void) tcsetattr(save_fd, TCSADRAIN, &save_termios);
572 }
573
574 /*
575 * Convert character to printable representation, for display with locally
576 * echoed command characters (like when we need to display ~^D)
577 */
578 static void
579 canonify(char c, char *cc)
580 {
581 if (isprint(c)) {
582 cc[0] = c;
583 cc[1] = '\0';
584 } else if (c >= 0 && c <= 31) { /* ^@ through ^_ */
585 cc[0] = '^';
586 cc[1] = c + '@';
587 cc[2] = '\0';
588 } else {
589 cc[0] = '\\';
590 cc[1] = ((c >> 6) & 7) + '0';
591 cc[2] = ((c >> 3) & 7) + '0';
592 cc[3] = (c & 7) + '0';
593 cc[4] = '\0';
594 }
595 }
596
597 /*
598 * process_user_input watches the input stream for the escape sequence for
599 * 'quit' (by default, tilde-period). Because we might be fed just one
600 * keystroke at a time, state associated with the user input (are we at the
601 * beginning of the line? are we locally echoing the next character?) is
602 * maintained by beginning_of_line and local_echo across calls to the routine.
603 * If the write to outfd fails, we'll try to read from infd in an attempt
604 * to prevent deadlock between the two processes.
605 *
606 * This routine returns -1 when the 'quit' escape sequence has been issued,
607 * or an error is encountered, 1 if stdin is EOF, and 0 otherwise.
608 */
609 static int
610 process_user_input(int outfd, int infd)
611 {
612 static boolean_t beginning_of_line = B_TRUE;
613 static boolean_t local_echo = B_FALSE;
614 char ibuf[ZLOGIN_BUFSIZ];
615 int nbytes;
616 char *buf = ibuf;
617
618 nbytes = read(STDIN_FILENO, ibuf, ZLOGIN_RDBUFSIZ);
619 if (nbytes == -1 && (errno != EINTR || dead))
620 return (-1);
621
622 if (nbytes == -1) /* The read was interrupted. */
623 return (0);
624
625 /* 0 read means EOF, close the pipe to the child */
626 if (nbytes == 0)
627 return (1);
628
629 for (char c = *buf; nbytes > 0; c = *buf, --nbytes) {
630 buf++;
631 if (beginning_of_line && !nocmdchar) {
632 beginning_of_line = B_FALSE;
633 if (c == cmdchar) {
634 local_echo = B_TRUE;
635 continue;
636 }
637 } else if (local_echo) {
638 local_echo = B_FALSE;
639 if (c == '.' || c == effective_termios.c_cc[VEOF]) {
640 char cc[CANONIFY_LEN];
641
642 canonify(c, cc);
643 (void) write(STDOUT_FILENO, &cmdchar, 1);
644 (void) write(STDOUT_FILENO, cc, strlen(cc));
645 return (-1);
646 }
647 }
648 retry:
649 if (write(outfd, &c, 1) <= 0) {
650 /*
651 * Since the fd we are writing to is opened with
652 * O_NONBLOCK it is possible to get EAGAIN if the
653 * pipe is full. One way this could happen is if we
654 * are writing a lot of data into the pipe in this loop
655 * and the application on the other end is echoing that
656 * data back out to its stdout. The output pipe can
657 * fill up since we are stuck here in this loop and not
658 * draining the other pipe. We can try to read some of
659 * the data to see if we can drain the pipe so that the
660 * application can continue to make progress. The read
661 * is non-blocking so we won't hang here. We also wait
662 * a bit before retrying since there could be other
663 * reasons why the pipe is full and we don't want to
664 * continuously retry.
665 */
666 if (errno == EAGAIN) {
667 struct timespec rqtp;
668 int ln;
669 char obuf[ZLOGIN_BUFSIZ];
670
671 if ((ln = read(infd, obuf, ZLOGIN_BUFSIZ)) > 0)
672 (void) write(STDOUT_FILENO, obuf, ln);
673
674 /* sleep for 10 milliseconds */
675 rqtp.tv_sec = 0;
676 rqtp.tv_nsec = MSEC2NSEC(10);
677 (void) nanosleep(&rqtp, NULL);
678 if (!dead)
679 goto retry;
680 }
681
682 return (-1);
683 }
684 beginning_of_line = (c == '\r' || c == '\n' ||
685 c == effective_termios.c_cc[VKILL] ||
686 c == effective_termios.c_cc[VEOL] ||
687 c == effective_termios.c_cc[VSUSP] ||
688 c == effective_termios.c_cc[VINTR]);
689 }
690 return (0);
691 }
692
693 /*
694 * This function prevents deadlock between zlogin and the application in the
695 * zone that it is talking to. This can happen when we read from zlogin's
696 * stdin and write the data down the pipe to the application. If the pipe
697 * is full, we'll block in the write. Because zlogin could be blocked in
698 * the write, it would never read the application's stdout/stderr so the
699 * application can then block on those writes (when the pipe fills up). If the
700 * the application gets blocked this way, it can never get around to reading
701 * its stdin so that zlogin can unblock from its write. Once in this state,
702 * the two processes are deadlocked.
703 *
704 * To prevent this, we want to verify that we can write into the pipe before we
705 * read from our stdin. If the pipe already is pretty full, we bypass the read
706 * for now. We'll circle back here again after the poll() so that we can
707 * try again. When this function is called, we already know there is data
708 * ready to read on STDIN_FILENO. We return -1 if there is a problem, 1 if
709 * stdin is EOF, and 0 if everything is ok (even though we might not have
710 * read/written any data into the pipe on this iteration).
711 */
712 static int
713 process_raw_input(int stdin_fd, int appin_fd)
714 {
715 int cc;
716 struct stat64 sb;
717 char ibuf[ZLOGIN_RDBUFSIZ];
718
719 /* Check how much data is already in the pipe */
720 if (fstat64(appin_fd, &sb) == -1) {
721 perror("stat failed");
722 return (-1);
723 }
724
725 if (dead)
726 return (-1);
727
728 /*
729 * The pipe already has a lot of data in it, don't write any more
730 * right now.
731 */
732 if (sb.st_size >= HI_WATER)
733 return (0);
734
735 cc = read(STDIN_FILENO, ibuf, ZLOGIN_RDBUFSIZ);
736 if (cc == -1 && (errno != EINTR || dead))
737 return (-1);
738
739 if (cc == -1) /* The read was interrupted. */
740 return (0);
741
742 /* 0 read means EOF, close the pipe to the child */
743 if (cc == 0)
744 return (1);
745
746 /*
747 * stdin_fd is stdin of the target; so, the thing we'll write the user
748 * data *to*.
749 */
750 if (write(stdin_fd, ibuf, cc) == -1)
751 return (-1);
752
753 return (0);
754 }
755
756 /*
757 * Write the output from the application running in the zone. We can get
758 * a signal during the write (usually it would be SIGCHLD when the application
759 * has exited) so we loop to make sure we have written all of the data we read.
760 */
761 static int
762 process_output(int in_fd, int out_fd)
763 {
764 int wrote = 0;
765 int cc;
766 char ibuf[ZLOGIN_BUFSIZ];
767
768 cc = read(in_fd, ibuf, ZLOGIN_BUFSIZ);
769 if (cc == -1 && (errno != EINTR || dead))
770 return (-1);
771 if (cc == 0)
772 return (-1); /* EOF */
773 if (cc == -1) /* The read was interrupted. */
774 return (0);
775
776 do {
777 int len;
778
779 len = write(out_fd, ibuf + wrote, cc - wrote);
780 if (len == -1 && errno != EINTR)
781 return (-1);
782 if (len != -1)
783 wrote += len;
784 } while (wrote < cc);
785
786 return (0);
787 }
788
789 /*
790 * This is the main I/O loop, and is shared across all zlogin modes.
791 * Parameters:
792 * stdin_fd: The fd representing 'stdin' for the slave side; input to
793 * the zone will be written here.
794 *
795 * appin_fd: The fd representing the other end of the 'stdin' pipe (when
796 * we're running non-interactive); used in process_raw_input
797 * to ensure we don't fill up the application's stdin pipe.
798 *
799 * stdout_fd: The fd representing 'stdout' for the slave side; output
800 * from the zone will arrive here.
801 *
802 * stderr_fd: The fd representing 'stderr' for the slave side; output
803 * from the zone will arrive here.
804 *
805 * raw_mode: If TRUE, then no processing (for example, for '~.') will
806 * be performed on the input coming from STDIN.
807 *
808 * stderr_fd may be specified as -1 if there is no stderr (only non-interactive
809 * mode supplies a stderr).
810 *
811 */
812 static void
813 doio(int stdin_fd, int appin_fd, int stdout_fd, int stderr_fd, int sig_fd,
814 boolean_t raw_mode)
815 {
816 struct pollfd pollfds[4];
817 char ibuf[ZLOGIN_BUFSIZ];
818 int cc, ret;
819
820 /* read from stdout of zone and write to stdout of global zone */
821 pollfds[0].fd = stdout_fd;
822 pollfds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
823
824 /* read from stderr of zone and write to stderr of global zone */
825 pollfds[1].fd = stderr_fd;
826 pollfds[1].events = pollfds[0].events;
827
828 /* read from stdin of global zone and write to stdin of zone */
829 pollfds[2].fd = STDIN_FILENO;
830 pollfds[2].events = pollfds[0].events;
831
832 /* read from signalling pipe so we know when child dies */
833 pollfds[3].fd = sig_fd;
834 pollfds[3].events = pollfds[0].events;
835
836 for (;;) {
837 pollfds[0].revents = pollfds[1].revents =
838 pollfds[2].revents = pollfds[3].revents = 0;
839
840 if (dead)
841 break;
842
843 /*
844 * There is a race condition here where we can receive the
845 * child death signal, set the dead flag, but since we have
846 * passed the test above, we would go into poll and hang.
847 * To avoid this we use the sig_fd as an additional poll fd.
848 * The signal handler writes into the other end of this pipe
849 * when the child dies so that the poll will always see that
850 * input and proceed. We just loop around at that point and
851 * then notice the dead flag.
852 */
853
854 ret = poll(pollfds,
855 sizeof (pollfds) / sizeof (struct pollfd), -1);
856
857 if (ret == -1 && errno != EINTR) {
858 perror("poll failed");
859 break;
860 }
861
862 if (errno == EINTR && dead) {
863 break;
864 }
865
866 /* event from master side stdout */
867 if (pollfds[0].revents) {
868 if (pollfds[0].revents &
869 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
870 if (process_output(stdout_fd, STDOUT_FILENO)
871 != 0)
872 break;
873 } else {
874 pollerr = pollfds[0].revents;
875 break;
876 }
877 }
878
879 /* event from master side stderr */
880 if (pollfds[1].revents) {
881 if (pollfds[1].revents &
882 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
883 if (process_output(stderr_fd, STDERR_FILENO)
884 != 0)
885 break;
886 } else {
887 pollerr = pollfds[1].revents;
888 break;
889 }
890 }
891
892 /* event from user STDIN side */
893 if (pollfds[2].revents) {
894 if (pollfds[2].revents &
895 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
896 /*
897 * stdin fd is stdin of the target; so,
898 * the thing we'll write the user data *to*.
899 *
900 * Also, unlike on the output side, we
901 * close the pipe on a zero-length message.
902 */
903 int res;
904
905 if (raw_mode)
906 res = process_raw_input(stdin_fd,
907 appin_fd);
908 else
909 res = process_user_input(stdin_fd,
910 stdout_fd);
911
912 if (res < 0)
913 break;
914 if (res > 0) {
915 /* EOF (close) child's stdin_fd */
916 pollfds[2].fd = -1;
917 while ((res = close(stdin_fd)) != 0 &&
918 errno == EINTR)
919 ;
920 if (res != 0)
921 break;
922 }
923
924 } else if (raw_mode && pollfds[2].revents & POLLHUP) {
925 /*
926 * It's OK to get a POLLHUP on STDIN-- it
927 * always happens if you do:
928 *
929 * echo foo | zlogin <zone> <command>
930 *
931 * We reset fd to -1 in this case to clear
932 * the condition and close the pipe (EOF) to
933 * the other side in order to wrap things up.
934 */
935 int res;
936
937 pollfds[2].fd = -1;
938 while ((res = close(stdin_fd)) != 0 &&
939 errno == EINTR)
940 ;
941 if (res != 0)
942 break;
943 } else {
944 pollerr = pollfds[2].revents;
945 break;
946 }
947 }
948 }
949
950 /*
951 * We are in the midst of dying, but try to poll with a short
952 * timeout to see if we can catch the last bit of I/O from the
953 * children.
954 */
955 retry:
956 pollfds[0].revents = pollfds[1].revents = 0;
957 (void) poll(pollfds, 2, 100);
958 if (pollfds[0].revents &
959 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
960 if ((cc = read(stdout_fd, ibuf, ZLOGIN_BUFSIZ)) > 0) {
961 (void) write(STDOUT_FILENO, ibuf, cc);
962 goto retry;
963 }
964 }
965 if (pollfds[1].revents &
966 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
967 if ((cc = read(stderr_fd, ibuf, ZLOGIN_BUFSIZ)) > 0) {
968 (void) write(STDERR_FILENO, ibuf, cc);
969 goto retry;
970 }
971 }
972 }
973
974 /*
975 * Fetch the user_cmd brand hook for getting a user's passwd(4) entry.
976 */
977 static const char *
978 zone_get_user_cmd(brand_handle_t bh, const char *login, char *user_cmd,
979 size_t len)
980 {
981 bzero(user_cmd, sizeof (user_cmd));
982 if (brand_get_user_cmd(bh, login, user_cmd, len) != 0)
983 return (NULL);
984
985 return (user_cmd);
986 }
987
988 /* From libc */
989 extern int str2passwd(const char *, int, void *, char *, int);
990
991 /*
992 * exec() the user_cmd brand hook, and convert the output string to a
993 * struct passwd. This is to be called after zone_enter().
994 *
995 */
996 static struct passwd *
997 zone_get_user_pw(const char *user_cmd, struct passwd *pwent, char *pwbuf,
998 int pwbuflen)
999 {
1000 char pwline[NSS_BUFLEN_PASSWD];
1001 char *cin = NULL;
1002 FILE *fin;
1003 int status;
1004
1005 assert(getzoneid() != GLOBAL_ZONEID);
1006
1007 if ((fin = popen(user_cmd, "r")) == NULL)
1008 return (NULL);
1009
1010 while (cin == NULL && !feof(fin))
1011 cin = fgets(pwline, sizeof (pwline), fin);
1012
1013 if (cin == NULL) {
1014 (void) pclose(fin);
1015 return (NULL);
1016 }
1017
1018 status = pclose(fin);
1019 if (!WIFEXITED(status))
1020 return (NULL);
1021 if (WEXITSTATUS(status) != 0)
1022 return (NULL);
1023
1024 if (str2passwd(pwline, sizeof (pwline), pwent, pwbuf, pwbuflen) == 0)
1025 return (pwent);
1026 else
1027 return (NULL);
1028 }
1029
1030 static char **
1031 zone_login_cmd(brand_handle_t bh, const char *login)
1032 {
1033 static char result_buf[ARG_MAX];
1034 char **new_argv, *ptr, *lasts;
1035 int n, a;
1036
1037 /* Get the login command for the target zone. */
1038 bzero(result_buf, sizeof (result_buf));
1039
1040 if (forced_login) {
1041 if (brand_get_forcedlogin_cmd(bh, login,
1042 result_buf, sizeof (result_buf)) != 0)
1043 return (NULL);
1044 } else {
1045 if (brand_get_login_cmd(bh, login,
1046 result_buf, sizeof (result_buf)) != 0)
1047 return (NULL);
1048 }
1049
1050 /*
1051 * We got back a string that we'd like to execute. But since
1052 * we're not doing the execution via a shell we'll need to convert
1053 * the exec string to an array of strings. We'll do that here
1054 * but we're going to be very simplistic about it and break stuff
1055 * up based on spaces. We're not even going to support any kind
1056 * of quoting or escape characters. It's truly amazing that
1057 * there is no library function in OpenSolaris to do this for us.
1058 */
1059
1060 /*
1061 * Be paranoid. Since we're deliniating based on spaces make
1062 * sure there are no adjacent spaces.
1063 */
1064 if (strstr(result_buf, " ") != NULL)
1065 return (NULL);
1066
1067 /* Remove any trailing whitespace. */
1068 n = strlen(result_buf);
1069 if (result_buf[n - 1] == ' ')
1070 result_buf[n - 1] = '\0';
1071
1072 /* Count how many elements there are in the exec string. */
1073 ptr = result_buf;
1074 for (n = 2; ((ptr = strchr(ptr + 1, (int)' ')) != NULL); n++)
1075 ;
1076
1077 /* Allocate the argv array that we're going to return. */
1078 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1079 return (NULL);
1080
1081 /* Tokenize the exec string and return. */
1082 a = 0;
1083 new_argv[a++] = result_buf;
1084 if (n > 2) {
1085 (void) strtok_r(result_buf, " ", &lasts);
1086 while ((new_argv[a++] = strtok_r(NULL, " ", &lasts)) != NULL)
1087 ;
1088 } else {
1089 new_argv[a++] = NULL;
1090 }
1091 assert(n == a);
1092 return (new_argv);
1093 }
1094
1095 /*
1096 * Prepare argv array for exec'd process; if we're passing commands to the
1097 * new process, then use su(1M) to do the invocation. Otherwise, use
1098 * 'login -z <from_zonename> -f' (-z is an undocumented option which tells
1099 * login that we're coming from another zone, and to disregard its CONSOLE
1100 * checks).
1101 */
1102 static char **
1103 prep_args(brand_handle_t bh, const char *login, char **argv)
1104 {
1105 int argc = 0, a = 0, i, n = -1;
1106 char **new_argv;
1107
1108 if (argv != NULL) {
1109 size_t subshell_len = 1;
1110 char *subshell;
1111
1112 while (argv[argc] != NULL)
1113 argc++;
1114
1115 for (i = 0; i < argc; i++) {
1116 subshell_len += strlen(argv[i]) + 1;
1117 }
1118 if ((subshell = calloc(1, subshell_len)) == NULL)
1119 return (NULL);
1120
1121 for (i = 0; i < argc; i++) {
1122 (void) strcat(subshell, argv[i]);
1123 (void) strcat(subshell, " ");
1124 }
1125
1126 if (failsafe) {
1127 n = 4;
1128 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1129 return (NULL);
1130
1131 new_argv[a++] = FAILSAFESHELL;
1132 } else {
1133 n = 5;
1134 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1135 return (NULL);
1136
1137 new_argv[a++] = SUPATH;
1138 if (strcmp(login, "root") != 0) {
1139 new_argv[a++] = "-";
1140 n++;
1141 }
1142 new_argv[a++] = (char *)login;
1143 }
1144 new_argv[a++] = "-c";
1145 new_argv[a++] = subshell;
1146 new_argv[a++] = NULL;
1147 assert(a == n);
1148 } else {
1149 if (failsafe) {
1150 n = 2;
1151 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1152 return (NULL);
1153 new_argv[a++] = FAILSAFESHELL;
1154 new_argv[a++] = NULL;
1155 assert(n == a);
1156 } else {
1157 new_argv = zone_login_cmd(bh, login);
1158 }
1159 }
1160
1161 return (new_argv);
1162 }
1163
1164 /*
1165 * Helper routine for prep_env below.
1166 */
1167 static char *
1168 add_env(char *name, char *value)
1169 {
1170 size_t sz = strlen(name) + strlen(value) + 2; /* name, =, value, NUL */
1171 char *str;
1172
1173 if ((str = malloc(sz)) == NULL)
1174 return (NULL);
1175
1176 (void) snprintf(str, sz, "%s=%s", name, value);
1177 return (str);
1178 }
1179
1180 /*
1181 * Prepare envp array for exec'd process.
1182 */
1183 static char **
1184 prep_env()
1185 {
1186 int e = 0, size = 1;
1187 char **new_env, *estr;
1188 char *term = getenv("TERM");
1189
1190 size++; /* for $PATH */
1191 if (term != NULL)
1192 size++;
1193
1194 /*
1195 * In failsafe mode we set $HOME, since '-l' isn't valid in this mode.
1196 * We also set $SHELL, since neither login nor su will be around to do
1197 * it.
1198 */
1199 if (failsafe)
1200 size += 2;
1201
1202 if ((new_env = malloc(sizeof (char *) * size)) == NULL)
1203 return (NULL);
1204
1205 if ((estr = add_env("PATH", DEF_PATH)) == NULL)
1206 return (NULL);
1207 new_env[e++] = estr;
1208
1209 if (term != NULL) {
1210 if ((estr = add_env("TERM", term)) == NULL)
1211 return (NULL);
1212 new_env[e++] = estr;
1213 }
1214
1215 if (failsafe) {
1216 if ((estr = add_env("HOME", "/")) == NULL)
1217 return (NULL);
1218 new_env[e++] = estr;
1219
1220 if ((estr = add_env("SHELL", FAILSAFESHELL)) == NULL)
1221 return (NULL);
1222 new_env[e++] = estr;
1223 }
1224
1225 new_env[e++] = NULL;
1226
1227 assert(e == size);
1228
1229 return (new_env);
1230 }
1231
1232 /*
1233 * Finish the preparation of the envp array for exec'd non-interactive
1234 * zlogins. This is called in the child process *after* we zone_enter(), since
1235 * it derives things we can only know within the zone, such as $HOME, $SHELL,
1236 * etc. We need only do this in the non-interactive, mode, since otherwise
1237 * login(1) will do it. We don't do this in failsafe mode, since it presents
1238 * additional ways in which the command could fail, and we'd prefer to avoid
1239 * that.
1240 */
1241 static char **
1242 prep_env_noninteractive(const char *user_cmd, char **env)
1243 {
1244 size_t size;
1245 char **new_env;
1246 int e, i;
1247 char *estr;
1248 char varmail[LOGNAME_MAX + 11]; /* strlen(/var/mail/) = 10, NUL */
1249 char pwbuf[NSS_BUFLEN_PASSWD + 1];
1250 struct passwd pwent;
1251 struct passwd *pw = NULL;
1252
1253 assert(env != NULL);
1254 assert(failsafe == 0);
1255
1256 /*
1257 * Exec the "user_cmd" brand hook to get a pwent for the
1258 * login user. If this fails, HOME will be set to "/", SHELL
1259 * will be set to $DEFAULTSHELL, and we will continue to exec
1260 * SUPATH <login> -c <cmd>.
1261 */
1262 pw = zone_get_user_pw(user_cmd, &pwent, pwbuf, sizeof (pwbuf));
1263
1264 /*
1265 * Get existing envp size.
1266 */
1267 for (size = 0; env[size] != NULL; size++)
1268 ;
1269
1270 e = size;
1271
1272 /*
1273 * Finish filling out the environment; we duplicate the environment
1274 * setup described in login(1), for lack of a better precedent.
1275 */
1276 if (pw != NULL)
1277 size += 3; /* LOGNAME, HOME, MAIL */
1278 else
1279 size += 1; /* HOME */
1280
1281 size++; /* always fill in SHELL */
1282 size++; /* terminating NULL */
1283
1284 if ((new_env = malloc(sizeof (char *) * size)) == NULL)
1285 goto malloc_fail;
1286
1287 /*
1288 * Copy existing elements of env into new_env.
1289 */
1290 for (i = 0; env[i] != NULL; i++) {
1291 if ((new_env[i] = strdup(env[i])) == NULL)
1292 goto malloc_fail;
1293 }
1294 assert(e == i);
1295
1296 if (pw != NULL) {
1297 if ((estr = add_env("LOGNAME", pw->pw_name)) == NULL)
1298 goto malloc_fail;
1299 new_env[e++] = estr;
1300
1301 if ((estr = add_env("HOME", pw->pw_dir)) == NULL)
1302 goto malloc_fail;
1303 new_env[e++] = estr;
1304
1305 if (chdir(pw->pw_dir) != 0)
1306 zerror(gettext("Could not chdir to home directory "
1307 "%s: %s"), pw->pw_dir, strerror(errno));
1308
1309 (void) snprintf(varmail, sizeof (varmail), "/var/mail/%s",
1310 pw->pw_name);
1311 if ((estr = add_env("MAIL", varmail)) == NULL)
1312 goto malloc_fail;
1313 new_env[e++] = estr;
1314 } else {
1315 if ((estr = add_env("HOME", "/")) == NULL)
1316 goto malloc_fail;
1317 new_env[e++] = estr;
1318 }
1319
1320 if (pw != NULL && strlen(pw->pw_shell) > 0) {
1321 if ((estr = add_env("SHELL", pw->pw_shell)) == NULL)
1322 goto malloc_fail;
1323 new_env[e++] = estr;
1324 } else {
1325 if ((estr = add_env("SHELL", DEFAULTSHELL)) == NULL)
1326 goto malloc_fail;
1327 new_env[e++] = estr;
1328 }
1329
1330 new_env[e++] = NULL; /* add terminating NULL */
1331
1332 assert(e == size);
1333 return (new_env);
1334
1335 malloc_fail:
1336 zperror(gettext("failed to allocate memory for process environment"));
1337 return (NULL);
1338 }
1339
1340 static int
1341 close_func(void *slavefd, int fd)
1342 {
1343 if (fd != *(int *)slavefd)
1344 (void) close(fd);
1345 return (0);
1346 }
1347
1348 static void
1349 set_cmdchar(char *cmdcharstr)
1350 {
1351 char c;
1352 long lc;
1353
1354 if ((c = *cmdcharstr) != '\\') {
1355 cmdchar = c;
1356 return;
1357 }
1358
1359 c = cmdcharstr[1];
1360 if (c == '\0' || c == '\\') {
1361 cmdchar = '\\';
1362 return;
1363 }
1364
1365 if (c < '0' || c > '7') {
1366 zerror(gettext("Unrecognized escape character option %s"),
1367 cmdcharstr);
1368 usage();
1369 }
1370
1371 lc = strtol(cmdcharstr + 1, NULL, 8);
1372 if (lc < 0 || lc > 255) {
1373 zerror(gettext("Octal escape character '%s' too large"),
1374 cmdcharstr);
1375 usage();
1376 }
1377 cmdchar = (char)lc;
1378 }
1379
1380 static int
1381 setup_utmpx(char *slavename)
1382 {
1383 struct utmpx ut;
1384
1385 bzero(&ut, sizeof (ut));
1386 (void) strncpy(ut.ut_user, ".zlogin", sizeof (ut.ut_user));
1387 (void) strncpy(ut.ut_line, slavename, sizeof (ut.ut_line));
1388 ut.ut_pid = getpid();
1389 ut.ut_id[0] = 'z';
1390 ut.ut_id[1] = ut.ut_id[2] = ut.ut_id[3] = (char)SC_WILDC;
1391 ut.ut_type = LOGIN_PROCESS;
1392 (void) time(&ut.ut_tv.tv_sec);
1393
1394 if (makeutx(&ut) == NULL) {
1395 zerror(gettext("makeutx failed"));
1396 return (-1);
1397 }
1398 return (0);
1399 }
1400
1401 static void
1402 release_lock_file(int lockfd)
1403 {
1404 (void) close(lockfd);
1405 }
1406
1407 static int
1408 grab_lock_file(const char *zone_name, int *lockfd)
1409 {
1410 char pathbuf[PATH_MAX];
1411 struct flock flock;
1412
1413 if (mkdir(ZONES_TMPDIR, S_IRWXU) < 0 && errno != EEXIST) {
1414 zerror(gettext("could not mkdir %s: %s"), ZONES_TMPDIR,
1415 strerror(errno));
1416 return (-1);
1417 }
1418 (void) chmod(ZONES_TMPDIR, S_IRWXU);
1419 (void) snprintf(pathbuf, sizeof (pathbuf), "%s/%s.zoneadm.lock",
1420 ZONES_TMPDIR, zone_name);
1421
1422 if ((*lockfd = open(pathbuf, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
1423 zerror(gettext("could not open %s: %s"), pathbuf,
1424 strerror(errno));
1425 return (-1);
1426 }
1427 /*
1428 * Lock the file to synchronize with other zoneadmds
1429 */
1430 flock.l_type = F_WRLCK;
1431 flock.l_whence = SEEK_SET;
1432 flock.l_start = (off_t)0;
1433 flock.l_len = (off_t)0;
1434 if (fcntl(*lockfd, F_SETLKW, &flock) < 0) {
1435 zerror(gettext("unable to lock %s: %s"), pathbuf,
1436 strerror(errno));
1437 release_lock_file(*lockfd);
1438 return (-1);
1439 }
1440 return (Z_OK);
1441 }
1442
1443 static int
1444 start_zoneadmd(const char *zone_name)
1445 {
1446 pid_t retval;
1447 int pstatus = 0, error = -1, lockfd, doorfd;
1448 struct door_info info;
1449 char doorpath[MAXPATHLEN];
1450
1451 (void) snprintf(doorpath, sizeof (doorpath), ZONE_DOOR_PATH, zone_name);
1452
1453 if (grab_lock_file(zone_name, &lockfd) != Z_OK)
1454 return (-1);
1455 /*
1456 * We must do the door check with the lock held. Otherwise, we
1457 * might race against another zoneadm/zlogin process and wind
1458 * up with two processes trying to start zoneadmd at the same
1459 * time. zoneadmd will detect this, and fail, but we prefer this
1460 * to be as seamless as is practical, from a user perspective.
1461 */
1462 if ((doorfd = open(doorpath, O_RDONLY)) < 0) {
1463 if (errno != ENOENT) {
1464 zerror("failed to open %s: %s", doorpath,
1465 strerror(errno));
1466 goto out;
1467 }
1468 } else {
1469 /*
1470 * Seems to be working ok.
1471 */
1472 if (door_info(doorfd, &info) == 0 &&
1473 ((info.di_attributes & DOOR_REVOKED) == 0)) {
1474 error = 0;
1475 goto out;
1476 }
1477 }
1478
1479 if ((child_pid = fork()) == -1) {
1480 zperror(gettext("could not fork"));
1481 goto out;
1482 } else if (child_pid == 0) {
1483 /* child process */
1484 (void) execl("/usr/lib/zones/zoneadmd", "zoneadmd", "-z",
1485 zone_name, NULL);
1486 zperror(gettext("could not exec zoneadmd"));
1487 _exit(1);
1488 }
1489
1490 /* parent process */
1491 do {
1492 retval = waitpid(child_pid, &pstatus, 0);
1493 } while (retval != child_pid);
1494 if (WIFSIGNALED(pstatus) ||
1495 (WIFEXITED(pstatus) && WEXITSTATUS(pstatus) != 0)) {
1496 zerror(gettext("could not start %s"), "zoneadmd");
1497 goto out;
1498 }
1499 error = 0;
1500 out:
1501 release_lock_file(lockfd);
1502 (void) close(doorfd);
1503 return (error);
1504 }
1505
1506 static int
1507 init_template(void)
1508 {
1509 int fd;
1510 int err = 0;
1511
1512 fd = open64(CTFS_ROOT "/process/template", O_RDWR);
1513 if (fd == -1)
1514 return (-1);
1515
1516 /*
1517 * zlogin doesn't do anything with the contract.
1518 * Deliver no events, don't inherit, and allow it to be orphaned.
1519 */
1520 err |= ct_tmpl_set_critical(fd, 0);
1521 err |= ct_tmpl_set_informative(fd, 0);
1522 err |= ct_pr_tmpl_set_fatal(fd, CT_PR_EV_HWERR);
1523 err |= ct_pr_tmpl_set_param(fd, CT_PR_PGRPONLY | CT_PR_REGENT);
1524 if (err || ct_tmpl_activate(fd)) {
1525 (void) close(fd);
1526 return (-1);
1527 }
1528
1529 return (fd);
1530 }
1531
1532 static int
1533 noninteractive_login(char *zonename, const char *user_cmd, zoneid_t zoneid,
1534 char **new_args, char **new_env)
1535 {
1536 pid_t retval;
1537 int stdin_pipe[2], stdout_pipe[2], stderr_pipe[2], dead_child_pipe[2];
1538 int child_status;
1539 int tmpl_fd;
1540 sigset_t block_cld;
1541
1542 if ((tmpl_fd = init_template()) == -1) {
1543 reset_tty();
1544 zperror(gettext("could not create contract"));
1545 return (1);
1546 }
1547
1548 if (pipe(stdin_pipe) != 0) {
1549 zperror(gettext("could not create STDIN pipe"));
1550 return (1);
1551 }
1552 /*
1553 * When the user types ^D, we get a zero length message on STDIN.
1554 * We need to echo that down the pipe to send it to the other side;
1555 * but by default, pipes don't propagate zero-length messages. We
1556 * toggle that behavior off using I_SWROPT. See streamio(7i).
1557 */
1558 if (ioctl(stdin_pipe[0], I_SWROPT, SNDZERO) != 0) {
1559 zperror(gettext("could not configure STDIN pipe"));
1560 return (1);
1561
1562 }
1563 if (pipe(stdout_pipe) != 0) {
1564 zperror(gettext("could not create STDOUT pipe"));
1565 return (1);
1566 }
1567 if (pipe(stderr_pipe) != 0) {
1568 zperror(gettext("could not create STDERR pipe"));
1569 return (1);
1570 }
1571
1572 if (pipe(dead_child_pipe) != 0) {
1573 zperror(gettext("could not create signalling pipe"));
1574 return (1);
1575 }
1576 close_on_sig = dead_child_pipe[0];
1577
1578 /*
1579 * If any of the pipe FD's winds up being less than STDERR, then we
1580 * have a mess on our hands-- and we are lacking some of the I/O
1581 * streams we would expect anyway. So we bail.
1582 */
1583 if (stdin_pipe[0] <= STDERR_FILENO ||
1584 stdin_pipe[1] <= STDERR_FILENO ||
1585 stdout_pipe[0] <= STDERR_FILENO ||
1586 stdout_pipe[1] <= STDERR_FILENO ||
1587 stderr_pipe[0] <= STDERR_FILENO ||
1588 stderr_pipe[1] <= STDERR_FILENO ||
1589 dead_child_pipe[0] <= STDERR_FILENO ||
1590 dead_child_pipe[1] <= STDERR_FILENO) {
1591 zperror(gettext("process lacks valid STDIN, STDOUT, STDERR"));
1592 return (1);
1593 }
1594
1595 if (prefork_dropprivs() != 0) {
1596 zperror(gettext("could not allocate privilege set"));
1597 return (1);
1598 }
1599
1600 (void) sigset(SIGCLD, sigcld);
1601 (void) sigemptyset(&block_cld);
1602 (void) sigaddset(&block_cld, SIGCLD);
1603 (void) sigprocmask(SIG_BLOCK, &block_cld, NULL);
1604
1605 if ((child_pid = fork()) == -1) {
1606 (void) ct_tmpl_clear(tmpl_fd);
1607 (void) close(tmpl_fd);
1608 zperror(gettext("could not fork"));
1609 return (1);
1610 } else if (child_pid == 0) { /* child process */
1611 (void) ct_tmpl_clear(tmpl_fd);
1612
1613 /*
1614 * Do a dance to get the pipes hooked up as FD's 0, 1 and 2.
1615 */
1616 (void) close(STDIN_FILENO);
1617 (void) close(STDOUT_FILENO);
1618 (void) close(STDERR_FILENO);
1619 (void) dup2(stdin_pipe[1], STDIN_FILENO);
1620 (void) dup2(stdout_pipe[1], STDOUT_FILENO);
1621 (void) dup2(stderr_pipe[1], STDERR_FILENO);
1622 (void) closefrom(STDERR_FILENO + 1);
1623
1624 (void) sigset(SIGCLD, SIG_DFL);
1625 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
1626 /*
1627 * In case any of stdin, stdout or stderr are streams,
1628 * anchor them to prevent malicious I_POPs.
1629 */
1630 (void) ioctl(STDIN_FILENO, I_ANCHOR);
1631 (void) ioctl(STDOUT_FILENO, I_ANCHOR);
1632 (void) ioctl(STDERR_FILENO, I_ANCHOR);
1633
1634 if (zone_enter(zoneid) == -1) {
1635 zerror(gettext("could not enter zone %s: %s"),
1636 zonename, strerror(errno));
1637 _exit(1);
1638 }
1639
1640 /*
1641 * For non-native zones, tell libc where it can find locale
1642 * specific getttext() messages.
1643 */
1644 if (access("/.SUNWnative/usr/lib/locale", R_OK) == 0)
1645 (void) bindtextdomain(TEXT_DOMAIN,
1646 "/.SUNWnative/usr/lib/locale");
1647 else if (access("/native/usr/lib/locale", R_OK) == 0)
1648 (void) bindtextdomain(TEXT_DOMAIN,
1649 "/native/usr/lib/locale");
1650
1651 if (!failsafe)
1652 new_env = prep_env_noninteractive(user_cmd, new_env);
1653
1654 if (new_env == NULL) {
1655 _exit(1);
1656 }
1657
1658 /*
1659 * Move into a new process group; the zone_enter will have
1660 * placed us into zsched's session, and we want to be in
1661 * a unique process group.
1662 */
1663 (void) setpgid(getpid(), getpid());
1664
1665 /*
1666 * The child needs to run as root to
1667 * execute the su program.
1668 */
1669 if (setuid(0) == -1) {
1670 zperror(gettext("insufficient privilege"));
1671 return (1);
1672 }
1673
1674 (void) execve(new_args[0], new_args, new_env);
1675 zperror(gettext("exec failure"));
1676 _exit(1);
1677 }
1678 /* parent */
1679
1680 /* close pipe sides written by child */
1681 (void) close(stdout_pipe[1]);
1682 (void) close(stderr_pipe[1]);
1683
1684 (void) sigset(SIGINT, sig_forward);
1685
1686 postfork_dropprivs();
1687
1688 (void) ct_tmpl_clear(tmpl_fd);
1689 (void) close(tmpl_fd);
1690
1691 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
1692 doio(stdin_pipe[0], stdin_pipe[1], stdout_pipe[0], stderr_pipe[0],
1693 dead_child_pipe[1], B_TRUE);
1694 do {
1695 retval = waitpid(child_pid, &child_status, 0);
1696 if (retval == -1) {
1697 child_status = 0;
1698 }
1699 } while (retval != child_pid && errno != ECHILD);
1700
1701 return (WEXITSTATUS(child_status));
1702 }
1703
1704 static char *
1705 get_username()
1706 {
1707 uid_t uid;
1708 struct passwd *nptr;
1709
1710 /*
1711 * Authorizations are checked to restrict access based on the
1712 * requested operation and zone name, It is assumed that the
1713 * program is running with all privileges, but that the real
1714 * user ID is that of the user or role on whose behalf we are
1715 * operating. So we start by getting the username that will be
1716 * used for subsequent authorization checks.
1717 */
1718
1719 uid = getuid();
1720 if ((nptr = getpwuid(uid)) == NULL) {
1721 zerror(gettext("could not get user name."));
1722 _exit(1);
1723 }
1724 return (nptr->pw_name);
1725 }
1726
1727 int
1728 main(int argc, char **argv)
1729 {
1730 int arg, console = 0;
1731 zoneid_t zoneid;
1732 zone_state_t st;
1733 char *login = "root";
1734 int lflag = 0;
1735 int nflag = 0;
1736 char *zonename = NULL;
1737 char **proc_args = NULL;
1738 char **new_args, **new_env;
1739 sigset_t block_cld;
1740 char devroot[MAXPATHLEN];
1741 char *slavename, slaveshortname[MAXPATHLEN];
1742 priv_set_t *privset;
1743 int tmpl_fd;
1744 char zonebrand[MAXNAMELEN];
1745 char default_brand[MAXNAMELEN];
1746 struct stat sb;
1747 char kernzone[ZONENAME_MAX];
1748 brand_handle_t bh;
1749 char user_cmd[MAXPATHLEN];
1750 char authname[MAXAUTHS];
1751
1752 (void) setlocale(LC_ALL, "");
1753 (void) textdomain(TEXT_DOMAIN);
1754
1755 (void) getpname(argv[0]);
1756 username = get_username();
1757
1758 while ((arg = getopt(argc, argv, "dnECR:Se:l:Q")) != EOF) {
1759 switch (arg) {
1760 case 'C':
1761 console = 1;
1762 break;
1763 case 'E':
1764 nocmdchar = 1;
1765 break;
1766 case 'R': /* undocumented */
1767 if (*optarg != '/') {
1768 zerror(gettext("root path must be absolute."));
1769 exit(2);
1770 }
1771 if (stat(optarg, &sb) == -1 || !S_ISDIR(sb.st_mode)) {
1772 zerror(
1773 gettext("root path must be a directory."));
1774 exit(2);
1775 }
1776 zonecfg_set_root(optarg);
1777 break;
1778 case 'Q':
1779 quiet = 1;
1780 break;
1781 case 'S':
1782 failsafe = 1;
1783 break;
1784 case 'd':
1785 disconnect = 1;
1786 break;
1787 case 'e':
1788 set_cmdchar(optarg);
1789 break;
1790 case 'l':
1791 login = optarg;
1792 lflag = 1;
1793 break;
1794 case 'n':
1795 nflag = 1;
1796 break;
1797 default:
1798 usage();
1799 }
1800 }
1801
1802 if (console != 0) {
1803
1804 if (lflag != 0) {
1805 zerror(gettext(
1806 "-l may not be specified for console login"));
1807 usage();
1808 }
1809
1810 if (nflag != 0) {
1811 zerror(gettext(
1812 "-n may not be specified for console login"));
1813 usage();
1814 }
1815
1816 if (failsafe != 0) {
1817 zerror(gettext(
1818 "-S may not be specified for console login"));
1819 usage();
1820 }
1821
1822 if (zonecfg_in_alt_root()) {
1823 zerror(gettext(
1824 "-R may not be specified for console login"));
1825 exit(2);
1826 }
1827
1828 }
1829
1830 if (failsafe != 0 && lflag != 0) {
1831 zerror(gettext("-l may not be specified for failsafe login"));
1832 usage();
1833 }
1834
1835 if (!console && disconnect != 0) {
1836 zerror(gettext(
1837 "-d may only be specified with console login"));
1838 usage();
1839 }
1840
1841 if (optind == (argc - 1)) {
1842 /*
1843 * zone name, no process name; this should be an interactive
1844 * as long as STDIN is really a tty.
1845 */
1846 if (nflag != 0) {
1847 zerror(gettext(
1848 "-n may not be specified for interactive login"));
1849 usage();
1850 }
1851 if (isatty(STDIN_FILENO))
1852 interactive = 1;
1853 zonename = argv[optind];
1854 } else if (optind < (argc - 1)) {
1855 if (console) {
1856 zerror(gettext("Commands may not be specified for "
1857 "console login."));
1858 usage();
1859 }
1860 /* zone name and process name, and possibly some args */
1861 zonename = argv[optind];
1862 proc_args = &argv[optind + 1];
1863 interactive = 0;
1864 } else {
1865 usage();
1866 }
1867
1868 if (getzoneid() != GLOBAL_ZONEID) {
1869 zerror(gettext("'%s' may only be used from the global zone"),
1870 pname);
1871 return (1);
1872 }
1873
1874 if (strcmp(zonename, GLOBAL_ZONENAME) == 0) {
1875 zerror(gettext("'%s' not applicable to the global zone"),
1876 pname);
1877 return (1);
1878 }
1879
1880 if (zone_get_state(zonename, &st) != Z_OK) {
1881 zerror(gettext("zone '%s' unknown"), zonename);
1882 return (1);
1883 }
1884
1885 if (st < ZONE_STATE_INSTALLED) {
1886 zerror(gettext("cannot login to a zone which is '%s'"),
1887 zone_state_str(st));
1888 return (1);
1889 }
1890
1891 /*
1892 * In both console and non-console cases, we require all privs.
1893 * In the console case, because we may need to startup zoneadmd.
1894 * In the non-console case in order to do zone_enter(2), zonept()
1895 * and other tasks.
1896 */
1897
1898 if ((privset = priv_allocset()) == NULL) {
1899 zperror(gettext("priv_allocset failed"));
1900 return (1);
1901 }
1902
1903 if (getppriv(PRIV_EFFECTIVE, privset) != 0) {
1904 zperror(gettext("getppriv failed"));
1905 priv_freeset(privset);
1906 return (1);
1907 }
1908
1909 if (priv_isfullset(privset) == B_FALSE) {
1910 zerror(gettext("You lack sufficient privilege to run "
1911 "this command (all privs required)"));
1912 priv_freeset(privset);
1913 return (1);
1914 }
1915 priv_freeset(privset);
1916
1917 /*
1918 * Check if user is authorized for requested usage of the zone
1919 */
1920
1921 (void) snprintf(authname, MAXAUTHS, "%s%s%s",
1922 ZONE_MANAGE_AUTH, KV_OBJECT, zonename);
1923 if (chkauthattr(authname, username) == 0) {
1924 if (console) {
1925 zerror(gettext("%s is not authorized for console "
1926 "access to %s zone."),
1927 username, zonename);
1928 return (1);
1929 } else {
1930 (void) snprintf(authname, MAXAUTHS, "%s%s%s",
1931 ZONE_LOGIN_AUTH, KV_OBJECT, zonename);
1932 if (failsafe || !interactive) {
1933 zerror(gettext("%s is not authorized for "
1934 "failsafe or non-interactive login "
1935 "to %s zone."), username, zonename);
1936 return (1);
1937 } else if (chkauthattr(authname, username) == 0) {
1938 zerror(gettext("%s is not authorized "
1939 " to login to %s zone."),
1940 username, zonename);
1941 return (1);
1942 }
1943 }
1944 } else {
1945 forced_login = B_TRUE;
1946 }
1947
1948 /*
1949 * The console is a separate case from the rest of the code; handle
1950 * it first.
1951 */
1952 if (console) {
1953 /*
1954 * Ensure that zoneadmd for this zone is running.
1955 */
1956 if (start_zoneadmd(zonename) == -1)
1957 return (1);
1958
1959 /*
1960 * Make contact with zoneadmd.
1961 */
1962 if (get_console_master(zonename) == -1)
1963 return (1);
1964
1965 if (!quiet)
1966 (void) printf(
1967 gettext("[Connected to zone '%s' console]\n"),
1968 zonename);
1969
1970 if (set_tty_rawmode(STDIN_FILENO) == -1) {
1971 reset_tty();
1972 zperror(gettext("failed to set stdin pty to raw mode"));
1973 return (1);
1974 }
1975
1976 (void) sigset(SIGWINCH, sigwinch);
1977 (void) sigwinch(0);
1978
1979 /*
1980 * Run the I/O loop until we get disconnected.
1981 */
1982 doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
1983 reset_tty();
1984 if (!quiet)
1985 (void) printf(
1986 gettext("\n[Connection to zone '%s' console "
1987 "closed]\n"), zonename);
1988
1989 return (0);
1990 }
1991
1992 if (st != ZONE_STATE_RUNNING && st != ZONE_STATE_MOUNTED) {
1993 zerror(gettext("login allowed only to running zones "
1994 "(%s is '%s')."), zonename, zone_state_str(st));
1995 return (1);
1996 }
1997
1998 (void) strlcpy(kernzone, zonename, sizeof (kernzone));
1999 if (zonecfg_in_alt_root()) {
2000 FILE *fp = zonecfg_open_scratch("", B_FALSE);
2001
2002 if (fp == NULL || zonecfg_find_scratch(fp, zonename,
2003 zonecfg_get_root(), kernzone, sizeof (kernzone)) == -1) {
2004 zerror(gettext("cannot find scratch zone %s"),
2005 zonename);
2006 if (fp != NULL)
2007 zonecfg_close_scratch(fp);
2008 return (1);
2009 }
2010 zonecfg_close_scratch(fp);
2011 }
2012
2013 if ((zoneid = getzoneidbyname(kernzone)) == -1) {
2014 zerror(gettext("failed to get zoneid for zone '%s'"),
2015 zonename);
2016 return (1);
2017 }
2018
2019 /*
2020 * We need the zone root path only if we are setting up a pty.
2021 */
2022 if (zone_get_devroot(zonename, devroot, sizeof (devroot)) == -1) {
2023 zerror(gettext("could not get dev path for zone %s"),
2024 zonename);
2025 return (1);
2026 }
2027
2028 if (zone_get_brand(zonename, zonebrand, sizeof (zonebrand)) != Z_OK) {
2029 zerror(gettext("could not get brand for zone %s"), zonename);
2030 return (1);
2031 }
2032 /*
2033 * In the alternate root environment, the only supported
2034 * operations are mount and unmount. In this case, just treat
2035 * the zone as native if it is cluster. Cluster zones can be
2036 * native for the purpose of LU or upgrade, and the cluster
2037 * brand may not exist in the miniroot (such as in net install
2038 * upgrade).
2039 */
2040 if (zonecfg_default_brand(default_brand,
2041 sizeof (default_brand)) != Z_OK) {
2042 zerror(gettext("unable to determine default brand"));
2043 return (1);
2044 }
2045 if (zonecfg_in_alt_root() &&
2046 strcmp(zonebrand, CLUSTER_BRAND_NAME) == 0) {
2047 (void) strlcpy(zonebrand, default_brand, sizeof (zonebrand));
2048 }
2049
2050 if ((bh = brand_open(zonebrand)) == NULL) {
2051 zerror(gettext("could not open brand for zone %s"), zonename);
2052 return (1);
2053 }
2054
2055 if ((new_args = prep_args(bh, login, proc_args)) == NULL) {
2056 zperror(gettext("could not assemble new arguments"));
2057 brand_close(bh);
2058 return (1);
2059 }
2060 /*
2061 * Get the brand specific user_cmd. This command is used to get
2062 * a passwd(4) entry for login.
2063 */
2064 if (!interactive && !failsafe) {
2065 if (zone_get_user_cmd(bh, login, user_cmd,
2066 sizeof (user_cmd)) == NULL) {
2067 zerror(gettext("could not get user_cmd for zone %s"),
2068 zonename);
2069 brand_close(bh);
2070 return (1);
2071 }
2072 }
2073 brand_close(bh);
2074
2075 if ((new_env = prep_env()) == NULL) {
2076 zperror(gettext("could not assemble new environment"));
2077 return (1);
2078 }
2079
2080 if (!interactive) {
2081 if (nflag) {
2082 int nfd;
2083
2084 if ((nfd = open(_PATH_DEVNULL, O_RDONLY)) < 0) {
2085 zperror(gettext("failed to open null device"));
2086 return (1);
2087 }
2088 if (nfd != STDIN_FILENO) {
2089 if (dup2(nfd, STDIN_FILENO) < 0) {
2090 zperror(gettext(
2091 "failed to dup2 null device"));
2092 return (1);
2093 }
2094 (void) close(nfd);
2095 }
2096 /* /dev/null is now standard input */
2097 }
2098 return (noninteractive_login(zonename, user_cmd, zoneid,
2099 new_args, new_env));
2100 }
2101
2102 if (zonecfg_in_alt_root()) {
2103 zerror(gettext("cannot use interactive login with scratch "
2104 "zone"));
2105 return (1);
2106 }
2107
2108 /*
2109 * Things are more complex in interactive mode; we get the
2110 * master side of the pty, then place the user's terminal into
2111 * raw mode.
2112 */
2113 if (get_master_pty() == -1) {
2114 zerror(gettext("could not setup master pty device"));
2115 return (1);
2116 }
2117
2118 /*
2119 * Compute the "short name" of the pts. /dev/pts/2 --> pts/2
2120 */
2121 if ((slavename = ptsname(masterfd)) == NULL) {
2122 zperror(gettext("failed to get name for pseudo-tty"));
2123 return (1);
2124 }
2125 if (strncmp(slavename, "/dev/", strlen("/dev/")) == 0)
2126 (void) strlcpy(slaveshortname, slavename + strlen("/dev/"),
2127 sizeof (slaveshortname));
2128 else
2129 (void) strlcpy(slaveshortname, slavename,
2130 sizeof (slaveshortname));
2131
2132 if (!quiet)
2133 (void) printf(gettext("[Connected to zone '%s' %s]\n"),
2134 zonename, slaveshortname);
2135
2136 if (set_tty_rawmode(STDIN_FILENO) == -1) {
2137 reset_tty();
2138 zperror(gettext("failed to set stdin pty to raw mode"));
2139 return (1);
2140 }
2141
2142 if (prefork_dropprivs() != 0) {
2143 reset_tty();
2144 zperror(gettext("could not allocate privilege set"));
2145 return (1);
2146 }
2147
2148 /*
2149 * We must mask SIGCLD until after we have coped with the fork
2150 * sufficiently to deal with it; otherwise we can race and receive the
2151 * signal before child_pid has been initialized (yes, this really
2152 * happens).
2153 */
2154 (void) sigset(SIGCLD, sigcld);
2155 (void) sigemptyset(&block_cld);
2156 (void) sigaddset(&block_cld, SIGCLD);
2157 (void) sigprocmask(SIG_BLOCK, &block_cld, NULL);
2158
2159 /*
2160 * We activate the contract template at the last minute to
2161 * avoid intermediate functions that could be using fork(2)
2162 * internally.
2163 */
2164 if ((tmpl_fd = init_template()) == -1) {
2165 reset_tty();
2166 zperror(gettext("could not create contract"));
2167 return (1);
2168 }
2169
2170 if ((child_pid = fork()) == -1) {
2171 (void) ct_tmpl_clear(tmpl_fd);
2172 reset_tty();
2173 zperror(gettext("could not fork"));
2174 return (1);
2175 } else if (child_pid == 0) { /* child process */
2176 int slavefd, newslave;
2177
2178 (void) ct_tmpl_clear(tmpl_fd);
2179 (void) close(tmpl_fd);
2180
2181 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
2182
2183 if ((slavefd = init_slave_pty(zoneid, devroot)) == -1)
2184 return (1);
2185
2186 /*
2187 * Close all fds except for the slave pty.
2188 */
2189 (void) fdwalk(close_func, &slavefd);
2190
2191 /*
2192 * Temporarily dup slavefd to stderr; that way if we have
2193 * to print out that zone_enter failed, the output will
2194 * have somewhere to go.
2195 */
2196 if (slavefd != STDERR_FILENO)
2197 (void) dup2(slavefd, STDERR_FILENO);
2198
2199 if (zone_enter(zoneid) == -1) {
2200 zerror(gettext("could not enter zone %s: %s"),
2201 zonename, strerror(errno));
2202 return (1);
2203 }
2204
2205 if (slavefd != STDERR_FILENO)
2206 (void) close(STDERR_FILENO);
2207
2208 /*
2209 * We take pains to get this process into a new process
2210 * group, and subsequently a new session. In this way,
2211 * we'll have a session which doesn't yet have a controlling
2212 * terminal. When we open the slave, it will become the
2213 * controlling terminal; no PIDs concerning pgrps or sids
2214 * will leak inappropriately into the zone.
2215 */
2216 (void) setpgrp();
2217
2218 /*
2219 * We need the slave pty to be referenced from the zone's
2220 * /dev in order to ensure that the devt's, etc are all
2221 * correct. Otherwise we break ttyname and the like.
2222 */
2223 if ((newslave = open(slavename, O_RDWR)) == -1) {
2224 (void) close(slavefd);
2225 return (1);
2226 }
2227 (void) close(slavefd);
2228 slavefd = newslave;
2229
2230 /*
2231 * dup the slave to the various FDs, so that when the
2232 * spawned process does a write/read it maps to the slave
2233 * pty.
2234 */
2235 (void) dup2(slavefd, STDIN_FILENO);
2236 (void) dup2(slavefd, STDOUT_FILENO);
2237 (void) dup2(slavefd, STDERR_FILENO);
2238 if (slavefd != STDIN_FILENO && slavefd != STDOUT_FILENO &&
2239 slavefd != STDERR_FILENO) {
2240 (void) close(slavefd);
2241 }
2242
2243 /*
2244 * In failsafe mode, we don't use login(1), so don't try
2245 * setting up a utmpx entry.
2246 */
2247 if (!failsafe)
2248 if (setup_utmpx(slaveshortname) == -1)
2249 return (1);
2250
2251 /*
2252 * The child needs to run as root to
2253 * execute the brand's login program.
2254 */
2255 if (setuid(0) == -1) {
2256 zperror(gettext("insufficient privilege"));
2257 return (1);
2258 }
2259
2260 (void) execve(new_args[0], new_args, new_env);
2261 zperror(gettext("exec failure"));
2262 return (1);
2263 }
2264
2265 (void) ct_tmpl_clear(tmpl_fd);
2266 (void) close(tmpl_fd);
2267
2268 /*
2269 * The rest is only for the parent process.
2270 */
2271 (void) sigset(SIGWINCH, sigwinch);
2272
2273 postfork_dropprivs();
2274
2275 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
2276 doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
2277
2278 reset_tty();
2279 if (!quiet)
2280 (void) fprintf(stderr,
2281 gettext("\n[Connection to zone '%s' %s closed]\n"),
2282 zonename, slaveshortname);
2283
2284 if (pollerr != 0) {
2285 (void) fprintf(stderr, gettext("Error: connection closed due "
2286 "to unexpected pollevents=0x%x.\n"), pollerr);
2287 return (1);
2288 }
2289
2290 return (0);
2291 }