Print this page
104 Bring back lx brand
| Split |
Close |
| Expand all |
| Collapse all |
--- old/usr/src/cmd/zlogin/zlogin.c
+++ new/usr/src/cmd/zlogin/zlogin.c
1 1 /*
2 2 * CDDL HEADER START
3 3 *
4 4 * The contents of this file are subject to the terms of the
5 5 * Common Development and Distribution License (the "License").
6 6 * You may not use this file except in compliance with the License.
7 7 *
8 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 9 * or http://www.opensolaris.org/os/licensing.
10 10 * See the License for the specific language governing permissions
11 11 * and limitations under the License.
12 12 *
13 13 * When distributing Covered Code, include this CDDL HEADER in each
14 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 15 * If applicable, add the following below this CDDL HEADER, with the
16 16 * fields enclosed by brackets "[]" replaced with your own identifying
17 17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 18 *
19 19 * CDDL HEADER END
20 20 */
21 21 /*
22 22 * Copyright (c) 2003, 2010, Oracle and/or its affiliates. All rights reserved.
23 23 */
24 24
25 25 /*
26 26 * zlogin provides three types of login which allow users in the global
27 27 * zone to access non-global zones.
28 28 *
29 29 * - "interactive login" is similar to rlogin(1); for example, the user could
30 30 * issue 'zlogin my-zone' or 'zlogin -e ^ -l me my-zone'. The user is
31 31 * granted a new pty (which is then shoved into the zone), and an I/O
32 32 * loop between parent and child processes takes care of the interactive
33 33 * session. In this mode, login(1) (and its -c option, which means
34 34 * "already authenticated") is employed to take care of the initialization
35 35 * of the user's session.
36 36 *
37 37 * - "non-interactive login" is similar to su(1M); the user could issue
38 38 * 'zlogin my-zone ls -l' and the command would be run as specified.
39 39 * In this mode, zlogin sets up pipes as the communication channel, and
40 40 * 'su' is used to do the login setup work.
41 41 *
42 42 * - "console login" is the equivalent to accessing the tip line for a
43 43 * zone. For example, the user can issue 'zlogin -C my-zone'.
44 44 * In this mode, zlogin contacts the zoneadmd process via unix domain
45 45 * socket. If zoneadmd is not running, it starts it. This allows the
46 46 * console to be available anytime the zone is installed, regardless of
47 47 * whether it is running.
48 48 */
49 49
50 50 #include <sys/socket.h>
51 51 #include <sys/termios.h>
52 52 #include <sys/utsname.h>
53 53 #include <sys/stat.h>
54 54 #include <sys/types.h>
55 55 #include <sys/contract/process.h>
56 56 #include <sys/ctfs.h>
57 57 #include <sys/brand.h>
58 58 #include <sys/wait.h>
59 59 #include <alloca.h>
60 60 #include <assert.h>
61 61 #include <ctype.h>
62 62 #include <door.h>
63 63 #include <errno.h>
64 64 #include <nss_dbdefs.h>
65 65 #include <poll.h>
66 66 #include <priv.h>
67 67 #include <pwd.h>
68 68 #include <unistd.h>
69 69 #include <utmpx.h>
70 70 #include <sac.h>
71 71 #include <signal.h>
72 72 #include <stdarg.h>
73 73 #include <stdio.h>
74 74 #include <stdlib.h>
75 75 #include <string.h>
76 76 #include <strings.h>
77 77 #include <stropts.h>
78 78 #include <wait.h>
79 79 #include <zone.h>
80 80 #include <fcntl.h>
81 81 #include <libdevinfo.h>
82 82 #include <libintl.h>
83 83 #include <locale.h>
84 84 #include <libzonecfg.h>
85 85 #include <libcontract.h>
86 86 #include <libbrand.h>
87 87 #include <auth_list.h>
88 88 #include <auth_attr.h>
89 89 #include <secdb.h>
90 90
91 91 static int masterfd;
92 92 static struct termios save_termios;
93 93 static struct termios effective_termios;
94 94 static int save_fd;
95 95 static struct winsize winsize;
96 96 static volatile int dead;
97 97 static volatile pid_t child_pid = -1;
98 98 static int interactive = 0;
99 99 static priv_set_t *dropprivs;
100 100
101 101 static int nocmdchar = 0;
102 102 static int failsafe = 0;
103 103 static char cmdchar = '~';
104 104
105 105 static int pollerr = 0;
106 106
107 107 static const char *pname;
108 108 static char *username;
109 109
110 110 /*
111 111 * When forced_login is true, the user is not prompted
112 112 * for an authentication password in the target zone.
113 113 */
114 114 static boolean_t forced_login = B_FALSE;
115 115
116 116 #if !defined(TEXT_DOMAIN) /* should be defined by cc -D */
117 117 #define TEXT_DOMAIN "SYS_TEST" /* Use this only if it wasn't */
118 118 #endif
119 119
120 120 #define SUPATH "/usr/bin/su"
121 121 #define FAILSAFESHELL "/sbin/sh"
122 122 #define DEFAULTSHELL "/sbin/sh"
123 123 #define DEF_PATH "/usr/sbin:/usr/bin"
124 124
125 125 #define CLUSTER_BRAND_NAME "cluster"
126 126
127 127 /*
128 128 * The ZLOGIN_BUFSIZ is larger than PIPE_BUF so we can be sure we're clearing
129 129 * out the pipe when the child is exiting. The ZLOGIN_RDBUFSIZ must be less
130 130 * than ZLOGIN_BUFSIZ (because we share the buffer in doio). This value is
131 131 * also chosen in conjunction with the HI_WATER setting to make sure we
132 132 * don't fill up the pipe. We can write FIFOHIWAT (16k) into the pipe before
133 133 * blocking. By having ZLOGIN_RDBUFSIZ set to 1k and HI_WATER set to 8k, we
134 134 * know we can always write a ZLOGIN_RDBUFSIZ chunk into the pipe when there
135 135 * is less than HI_WATER data already in the pipe.
136 136 */
137 137 #define ZLOGIN_BUFSIZ 8192
138 138 #define ZLOGIN_RDBUFSIZ 1024
139 139 #define HI_WATER 8192
140 140
141 141 /*
142 142 * See canonify() below. CANONIFY_LEN is the maximum length that a
143 143 * "canonical" sequence will expand to (backslash, three octal digits, NUL).
144 144 */
145 145 #define CANONIFY_LEN 5
146 146
147 147 static void
148 148 usage(void)
149 149 {
150 150 (void) fprintf(stderr, gettext("usage: %s [ -CES ] [ -e cmdchar ] "
151 151 "[-l user] zonename [command [args ...] ]\n"), pname);
152 152 exit(2);
153 153 }
154 154
155 155 static const char *
156 156 getpname(const char *arg0)
157 157 {
158 158 const char *p = strrchr(arg0, '/');
159 159
160 160 if (p == NULL)
161 161 p = arg0;
162 162 else
163 163 p++;
164 164
165 165 pname = p;
166 166 return (p);
167 167 }
168 168
169 169 static void
170 170 zerror(const char *fmt, ...)
171 171 {
172 172 va_list alist;
173 173
174 174 (void) fprintf(stderr, "%s: ", pname);
175 175 va_start(alist, fmt);
176 176 (void) vfprintf(stderr, fmt, alist);
177 177 va_end(alist);
178 178 (void) fprintf(stderr, "\n");
179 179 }
180 180
181 181 static void
182 182 zperror(const char *str)
183 183 {
184 184 const char *estr;
185 185
186 186 if ((estr = strerror(errno)) != NULL)
187 187 (void) fprintf(stderr, "%s: %s: %s\n", pname, str, estr);
188 188 else
189 189 (void) fprintf(stderr, "%s: %s: errno %d\n", pname, str, errno);
190 190 }
191 191
192 192 /*
193 193 * The first part of our privilege dropping scheme needs to be called before
194 194 * fork(), since we must have it for security; we don't want to be surprised
195 195 * later that we couldn't allocate the privset.
196 196 */
197 197 static int
198 198 prefork_dropprivs()
199 199 {
200 200 if ((dropprivs = priv_allocset()) == NULL)
201 201 return (1);
202 202
203 203 priv_basicset(dropprivs);
204 204 (void) priv_delset(dropprivs, PRIV_PROC_INFO);
205 205 (void) priv_delset(dropprivs, PRIV_PROC_FORK);
206 206 (void) priv_delset(dropprivs, PRIV_PROC_EXEC);
207 207 (void) priv_delset(dropprivs, PRIV_FILE_LINK_ANY);
208 208
209 209 /*
210 210 * We need to keep the basic privilege PROC_SESSION and all unknown
211 211 * basic privileges as well as the privileges PROC_ZONE and
212 212 * PROC_OWNER in order to query session information and
213 213 * send signals.
214 214 */
215 215 if (interactive == 0) {
216 216 (void) priv_addset(dropprivs, PRIV_PROC_ZONE);
217 217 (void) priv_addset(dropprivs, PRIV_PROC_OWNER);
218 218 } else {
219 219 (void) priv_delset(dropprivs, PRIV_PROC_SESSION);
220 220 }
221 221
222 222 return (0);
223 223 }
224 224
225 225 /*
226 226 * The second part of the privilege drop. We are paranoid about being attacked
227 227 * by the zone, so we drop all privileges. This should prevent a compromise
228 228 * which gets us to fork(), exec(), symlink(), etc.
229 229 */
230 230 static void
231 231 postfork_dropprivs()
232 232 {
233 233 if ((setppriv(PRIV_SET, PRIV_PERMITTED, dropprivs)) == -1) {
234 234 zperror(gettext("Warning: could not set permitted privileges"));
235 235 }
236 236 if ((setppriv(PRIV_SET, PRIV_LIMIT, dropprivs)) == -1) {
237 237 zperror(gettext("Warning: could not set limit privileges"));
238 238 }
239 239 if ((setppriv(PRIV_SET, PRIV_INHERITABLE, dropprivs)) == -1) {
240 240 zperror(gettext("Warning: could not set inheritable "
241 241 "privileges"));
242 242 }
243 243 }
244 244
245 245 /*
246 246 * Create the unix domain socket and call the zoneadmd server; handshake
247 247 * with it to determine whether it will allow us to connect.
248 248 */
249 249 static int
250 250 get_console_master(const char *zname)
251 251 {
252 252 int sockfd = -1;
253 253 struct sockaddr_un servaddr;
254 254 char clientid[MAXPATHLEN];
255 255 char handshake[MAXPATHLEN], c;
256 256 int msglen;
257 257 int i = 0, err = 0;
258 258
259 259 if ((sockfd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
260 260 zperror(gettext("could not create socket"));
261 261 return (-1);
262 262 }
263 263
264 264 bzero(&servaddr, sizeof (servaddr));
265 265 servaddr.sun_family = AF_UNIX;
266 266 (void) snprintf(servaddr.sun_path, sizeof (servaddr.sun_path),
267 267 "%s/%s.console_sock", ZONES_TMPDIR, zname);
268 268
269 269 if (connect(sockfd, (struct sockaddr *)&servaddr,
270 270 sizeof (servaddr)) == -1) {
271 271 zperror(gettext("Could not connect to zone console"));
272 272 goto bad;
273 273 }
274 274 masterfd = sockfd;
275 275
276 276 msglen = snprintf(clientid, sizeof (clientid), "IDENT %lu %s\n",
277 277 getpid(), setlocale(LC_MESSAGES, NULL));
278 278
279 279 if (msglen >= sizeof (clientid) || msglen < 0) {
280 280 zerror("protocol error");
281 281 goto bad;
282 282 }
283 283
284 284 if (write(masterfd, clientid, msglen) != msglen) {
285 285 zerror("protocol error");
286 286 goto bad;
287 287 }
288 288
289 289 bzero(handshake, sizeof (handshake));
290 290
291 291 /*
292 292 * Take care not to accumulate more than our fill, and leave room for
293 293 * the NUL at the end.
294 294 */
295 295 while ((err = read(masterfd, &c, 1)) == 1) {
296 296 if (i >= (sizeof (handshake) - 1))
297 297 break;
298 298 if (c == '\n')
299 299 break;
300 300 handshake[i] = c;
301 301 i++;
302 302 }
303 303
304 304 /*
305 305 * If something went wrong during the handshake we bail; perhaps
306 306 * the server died off.
307 307 */
308 308 if (err == -1) {
309 309 zperror(gettext("Could not connect to zone console"));
310 310 goto bad;
311 311 }
312 312
313 313 if (strncmp(handshake, "OK", sizeof (handshake)) == 0)
314 314 return (0);
315 315
316 316 zerror(gettext("Console is already in use by process ID %s."),
317 317 handshake);
318 318 bad:
319 319 (void) close(sockfd);
320 320 masterfd = -1;
321 321 return (-1);
322 322 }
323 323
324 324
325 325 /*
326 326 * Routines to handle pty creation upon zone entry and to shuttle I/O back
327 327 * and forth between the two terminals. We also compute and store the
328 328 * name of the slave terminal associated with the master side.
329 329 */
330 330 static int
331 331 get_master_pty()
332 332 {
333 333 if ((masterfd = open("/dev/ptmx", O_RDWR|O_NONBLOCK)) < 0) {
334 334 zperror(gettext("failed to obtain a pseudo-tty"));
335 335 return (-1);
336 336 }
337 337 if (tcgetattr(STDIN_FILENO, &save_termios) == -1) {
338 338 zperror(gettext("failed to get terminal settings from stdin"));
339 339 return (-1);
340 340 }
341 341 (void) ioctl(STDIN_FILENO, TIOCGWINSZ, (char *)&winsize);
342 342
343 343 return (0);
344 344 }
345 345
346 346 /*
347 347 * This is a bit tricky; normally a pts device will belong to the zone it
348 348 * is granted to. But in the case of "entering" a zone, we need to establish
349 349 * the pty before entering the zone so that we can vector I/O to and from it
350 350 * from the global zone.
351 351 *
352 352 * We use the zonept() call to let the ptm driver know what we are up to;
353 353 * the only other hairy bit is the setting of zoneslavename (which happens
354 354 * above, in get_master_pty()).
355 355 */
356 356 static int
357 357 init_slave_pty(zoneid_t zoneid, char *devroot)
358 358 {
359 359 int slavefd = -1;
360 360 char *slavename, zoneslavename[MAXPATHLEN];
361 361
362 362 /*
363 363 * Set slave permissions, zone the pts, then unlock it.
364 364 */
365 365 if (grantpt(masterfd) != 0) {
366 366 zperror(gettext("grantpt failed"));
367 367 return (-1);
368 368 }
369 369
370 370 if (unlockpt(masterfd) != 0) {
371 371 zperror(gettext("unlockpt failed"));
372 372 return (-1);
373 373 }
374 374
375 375 /*
376 376 * We must open the slave side before zoning this pty; otherwise
377 377 * the kernel would refuse us the open-- zoning a pty makes it
378 378 * inaccessible to the global zone. Note we are trying to open
379 379 * the device node via the $ZONEROOT/dev path for this pty.
380 380 *
381 381 * Later we'll close the slave out when once we've opened it again
382 382 * from within the target zone. Blarg.
383 383 */
384 384 if ((slavename = ptsname(masterfd)) == NULL) {
385 385 zperror(gettext("failed to get name for pseudo-tty"));
386 386 return (-1);
387 387 }
388 388
389 389 (void) snprintf(zoneslavename, sizeof (zoneslavename), "%s%s",
390 390 devroot, slavename);
391 391
392 392 if ((slavefd = open(zoneslavename, O_RDWR)) < 0) {
393 393 zerror(gettext("failed to open %s: %s"), zoneslavename,
394 394 strerror(errno));
395 395 return (-1);
396 396 }
397 397
398 398 /*
399 399 * Push hardware emulation (ptem), line discipline (ldterm),
400 400 * and V7/4BSD/Xenix compatibility (ttcompat) modules.
401 401 */
402 402 if (ioctl(slavefd, I_PUSH, "ptem") == -1) {
403 403 zperror(gettext("failed to push ptem module"));
404 404 if (!failsafe)
405 405 goto bad;
406 406 }
407 407
408 408 /*
409 409 * Anchor the stream to prevent malicious I_POPs; we prefer to do
410 410 * this prior to entering the zone so that we can detect any errors
411 411 * early, and so that we can set the anchor from the global zone.
412 412 */
413 413 if (ioctl(slavefd, I_ANCHOR) == -1) {
414 414 zperror(gettext("failed to set stream anchor"));
415 415 if (!failsafe)
416 416 goto bad;
417 417 }
418 418
419 419 if (ioctl(slavefd, I_PUSH, "ldterm") == -1) {
420 420 zperror(gettext("failed to push ldterm module"));
421 421 if (!failsafe)
422 422 goto bad;
423 423 }
424 424 if (ioctl(slavefd, I_PUSH, "ttcompat") == -1) {
425 425 zperror(gettext("failed to push ttcompat module"));
426 426 if (!failsafe)
427 427 goto bad;
428 428 }
429 429
430 430 /*
431 431 * Propagate terminal settings from the external term to the new one.
432 432 */
433 433 if (tcsetattr(slavefd, TCSAFLUSH, &save_termios) == -1) {
434 434 zperror(gettext("failed to set terminal settings"));
435 435 if (!failsafe)
436 436 goto bad;
437 437 }
438 438 (void) ioctl(slavefd, TIOCSWINSZ, (char *)&winsize);
439 439
440 440 if (zonept(masterfd, zoneid) != 0) {
441 441 zperror(gettext("could not set zoneid of pty"));
442 442 goto bad;
443 443 }
444 444
445 445 return (slavefd);
446 446
447 447 bad:
448 448 (void) close(slavefd);
449 449 return (-1);
450 450 }
451 451
452 452 /*
453 453 * Place terminal into raw mode.
454 454 */
455 455 static int
456 456 set_tty_rawmode(int fd)
457 457 {
458 458 struct termios term;
459 459 if (tcgetattr(fd, &term) < 0) {
460 460 zperror(gettext("failed to get user terminal settings"));
461 461 return (-1);
462 462 }
463 463
464 464 /* Stash for later, so we can revert back to previous mode */
465 465 save_termios = term;
466 466 save_fd = fd;
467 467
468 468 /* disable 8->7 bit strip, start/stop, enable any char to restart */
469 469 term.c_iflag &= ~(ISTRIP|IXON|IXANY);
470 470 /* disable NL->CR, CR->NL, ignore CR, UPPER->lower */
471 471 term.c_iflag &= ~(INLCR|ICRNL|IGNCR|IUCLC);
472 472 /* disable output post-processing */
473 473 term.c_oflag &= ~OPOST;
474 474 /* disable canonical mode, signal chars, echo & extended functions */
475 475 term.c_lflag &= ~(ICANON|ISIG|ECHO|IEXTEN);
476 476
477 477 term.c_cc[VMIN] = 1; /* byte-at-a-time */
478 478 term.c_cc[VTIME] = 0;
479 479
480 480 if (tcsetattr(STDIN_FILENO, TCSAFLUSH, &term)) {
481 481 zperror(gettext("failed to set user terminal to raw mode"));
482 482 return (-1);
483 483 }
484 484
485 485 /*
486 486 * We need to know the value of VEOF so that we can properly process for
487 487 * client-side ~<EOF>. But we have obliterated VEOF in term,
488 488 * because VMIN overloads the same array slot in non-canonical mode.
489 489 * Stupid @&^%!
490 490 *
491 491 * So here we construct the "effective" termios from the current
492 492 * terminal settings, and the corrected VEOF and VEOL settings.
493 493 */
494 494 if (tcgetattr(STDIN_FILENO, &effective_termios) < 0) {
495 495 zperror(gettext("failed to get user terminal settings"));
496 496 return (-1);
497 497 }
498 498 effective_termios.c_cc[VEOF] = save_termios.c_cc[VEOF];
499 499 effective_termios.c_cc[VEOL] = save_termios.c_cc[VEOL];
500 500
501 501 return (0);
502 502 }
503 503
504 504 /*
505 505 * Copy terminal window size from our terminal to the pts.
506 506 */
507 507 /*ARGSUSED*/
508 508 static void
509 509 sigwinch(int s)
510 510 {
511 511 struct winsize ws;
512 512
513 513 if (ioctl(0, TIOCGWINSZ, &ws) == 0)
514 514 (void) ioctl(masterfd, TIOCSWINSZ, &ws);
515 515 }
516 516
517 517 static volatile int close_on_sig = -1;
518 518
519 519 static void
520 520 /*ARGSUSED*/
521 521 sigcld(int s)
522 522 {
523 523 int status;
524 524 pid_t pid;
525 525
526 526 /*
527 527 * Peek at the exit status. If this isn't the process we cared
528 528 * about, then just reap it.
529 529 */
530 530 if ((pid = waitpid(child_pid, &status, WNOHANG|WNOWAIT)) != -1) {
531 531 if (pid == child_pid &&
532 532 (WIFEXITED(status) || WIFSIGNALED(status))) {
533 533 dead = 1;
534 534 if (close_on_sig != -1) {
535 535 (void) write(close_on_sig, "a", 1);
536 536 (void) close(close_on_sig);
537 537 close_on_sig = -1;
538 538 }
539 539 } else {
540 540 (void) waitpid(pid, &status, WNOHANG);
541 541 }
542 542 }
543 543 }
544 544
545 545 /*
546 546 * Some signals (currently, SIGINT) must be forwarded on to the process
547 547 * group of the child process.
548 548 */
549 549 static void
550 550 sig_forward(int s)
551 551 {
552 552 if (child_pid != -1) {
553 553 pid_t pgid = getpgid(child_pid);
554 554 if (pgid != -1)
555 555 (void) sigsend(P_PGID, pgid, s);
556 556 }
557 557 }
558 558
559 559 /*
560 560 * reset terminal settings for global environment
561 561 */
562 562 static void
563 563 reset_tty()
564 564 {
565 565 (void) tcsetattr(save_fd, TCSADRAIN, &save_termios);
566 566 }
567 567
568 568 /*
569 569 * Convert character to printable representation, for display with locally
570 570 * echoed command characters (like when we need to display ~^D)
571 571 */
572 572 static void
573 573 canonify(char c, char *cc)
574 574 {
575 575 if (isprint(c)) {
576 576 cc[0] = c;
577 577 cc[1] = '\0';
578 578 } else if (c >= 0 && c <= 31) { /* ^@ through ^_ */
579 579 cc[0] = '^';
580 580 cc[1] = c + '@';
581 581 cc[2] = '\0';
582 582 } else {
583 583 cc[0] = '\\';
584 584 cc[1] = ((c >> 6) & 7) + '0';
585 585 cc[2] = ((c >> 3) & 7) + '0';
586 586 cc[3] = (c & 7) + '0';
587 587 cc[4] = '\0';
588 588 }
589 589 }
590 590
591 591 /*
592 592 * process_user_input watches the input stream for the escape sequence for
593 593 * 'quit' (by default, tilde-period). Because we might be fed just one
594 594 * keystroke at a time, state associated with the user input (are we at the
595 595 * beginning of the line? are we locally echoing the next character?) is
596 596 * maintained by beginning_of_line and local_echo across calls to the routine.
597 597 * If the write to outfd fails, we'll try to read from infd in an attempt
598 598 * to prevent deadlock between the two processes.
599 599 *
600 600 * This routine returns -1 when the 'quit' escape sequence has been issued,
601 601 * or an error is encountered, 1 if stdin is EOF, and 0 otherwise.
602 602 */
603 603 static int
604 604 process_user_input(int outfd, int infd)
605 605 {
606 606 static boolean_t beginning_of_line = B_TRUE;
607 607 static boolean_t local_echo = B_FALSE;
608 608 char ibuf[ZLOGIN_BUFSIZ];
609 609 int nbytes;
610 610 char *buf = ibuf;
611 611 char c = *buf;
612 612
613 613 nbytes = read(STDIN_FILENO, ibuf, ZLOGIN_RDBUFSIZ);
614 614 if (nbytes == -1 && (errno != EINTR || dead))
615 615 return (-1);
616 616
617 617 if (nbytes == -1) /* The read was interrupted. */
618 618 return (0);
619 619
620 620 /* 0 read means EOF, close the pipe to the child */
621 621 if (nbytes == 0)
622 622 return (1);
623 623
624 624 for (c = *buf; nbytes > 0; c = *buf, --nbytes) {
625 625 buf++;
626 626 if (beginning_of_line && !nocmdchar) {
627 627 beginning_of_line = B_FALSE;
628 628 if (c == cmdchar) {
629 629 local_echo = B_TRUE;
630 630 continue;
631 631 }
632 632 } else if (local_echo) {
633 633 local_echo = B_FALSE;
634 634 if (c == '.' || c == effective_termios.c_cc[VEOF]) {
635 635 char cc[CANONIFY_LEN];
636 636
637 637 canonify(c, cc);
638 638 (void) write(STDOUT_FILENO, &cmdchar, 1);
639 639 (void) write(STDOUT_FILENO, cc, strlen(cc));
640 640 return (-1);
641 641 }
642 642 }
643 643 retry:
644 644 if (write(outfd, &c, 1) <= 0) {
645 645 /*
646 646 * Since the fd we are writing to is opened with
647 647 * O_NONBLOCK it is possible to get EAGAIN if the
648 648 * pipe is full. One way this could happen is if we
649 649 * are writing a lot of data into the pipe in this loop
650 650 * and the application on the other end is echoing that
651 651 * data back out to its stdout. The output pipe can
652 652 * fill up since we are stuck here in this loop and not
653 653 * draining the other pipe. We can try to read some of
654 654 * the data to see if we can drain the pipe so that the
655 655 * application can continue to make progress. The read
656 656 * is non-blocking so we won't hang here. We also wait
657 657 * a bit before retrying since there could be other
658 658 * reasons why the pipe is full and we don't want to
659 659 * continuously retry.
660 660 */
661 661 if (errno == EAGAIN) {
662 662 struct timespec rqtp;
663 663 int ln;
664 664 char obuf[ZLOGIN_BUFSIZ];
665 665
666 666 if ((ln = read(infd, obuf, ZLOGIN_BUFSIZ)) > 0)
667 667 (void) write(STDOUT_FILENO, obuf, ln);
668 668
669 669 /* sleep for 10 milliseconds */
670 670 rqtp.tv_sec = 0;
671 671 rqtp.tv_nsec = 10 * (NANOSEC / MILLISEC);
672 672 (void) nanosleep(&rqtp, NULL);
673 673 if (!dead)
674 674 goto retry;
675 675 }
676 676
677 677 return (-1);
678 678 }
679 679 beginning_of_line = (c == '\r' || c == '\n' ||
680 680 c == effective_termios.c_cc[VKILL] ||
681 681 c == effective_termios.c_cc[VEOL] ||
682 682 c == effective_termios.c_cc[VSUSP] ||
683 683 c == effective_termios.c_cc[VINTR]);
684 684 }
685 685 return (0);
686 686 }
687 687
688 688 /*
689 689 * This function prevents deadlock between zlogin and the application in the
690 690 * zone that it is talking to. This can happen when we read from zlogin's
691 691 * stdin and write the data down the pipe to the application. If the pipe
692 692 * is full, we'll block in the write. Because zlogin could be blocked in
693 693 * the write, it would never read the application's stdout/stderr so the
694 694 * application can then block on those writes (when the pipe fills up). If the
695 695 * the application gets blocked this way, it can never get around to reading
696 696 * its stdin so that zlogin can unblock from its write. Once in this state,
697 697 * the two processes are deadlocked.
698 698 *
699 699 * To prevent this, we want to verify that we can write into the pipe before we
700 700 * read from our stdin. If the pipe already is pretty full, we bypass the read
701 701 * for now. We'll circle back here again after the poll() so that we can
702 702 * try again. When this function is called, we already know there is data
703 703 * ready to read on STDIN_FILENO. We return -1 if there is a problem, 1 if
704 704 * stdin is EOF, and 0 if everything is ok (even though we might not have
705 705 * read/written any data into the pipe on this iteration).
706 706 */
707 707 static int
708 708 process_raw_input(int stdin_fd, int appin_fd)
709 709 {
710 710 int cc;
711 711 struct stat64 sb;
712 712 char ibuf[ZLOGIN_RDBUFSIZ];
713 713
714 714 /* Check how much data is already in the pipe */
715 715 if (fstat64(appin_fd, &sb) == -1) {
716 716 perror("stat failed");
717 717 return (-1);
718 718 }
719 719
720 720 if (dead)
721 721 return (-1);
722 722
723 723 /*
724 724 * The pipe already has a lot of data in it, don't write any more
725 725 * right now.
726 726 */
727 727 if (sb.st_size >= HI_WATER)
728 728 return (0);
729 729
730 730 cc = read(STDIN_FILENO, ibuf, ZLOGIN_RDBUFSIZ);
731 731 if (cc == -1 && (errno != EINTR || dead))
732 732 return (-1);
733 733
734 734 if (cc == -1) /* The read was interrupted. */
735 735 return (0);
736 736
737 737 /* 0 read means EOF, close the pipe to the child */
738 738 if (cc == 0)
739 739 return (1);
740 740
741 741 /*
742 742 * stdin_fd is stdin of the target; so, the thing we'll write the user
743 743 * data *to*.
744 744 */
745 745 if (write(stdin_fd, ibuf, cc) == -1)
746 746 return (-1);
747 747
748 748 return (0);
749 749 }
750 750
751 751 /*
752 752 * Write the output from the application running in the zone. We can get
753 753 * a signal during the write (usually it would be SIGCHLD when the application
754 754 * has exited) so we loop to make sure we have written all of the data we read.
755 755 */
756 756 static int
757 757 process_output(int in_fd, int out_fd)
758 758 {
759 759 int wrote = 0;
760 760 int cc;
761 761 char ibuf[ZLOGIN_BUFSIZ];
762 762
763 763 cc = read(in_fd, ibuf, ZLOGIN_BUFSIZ);
764 764 if (cc == -1 && (errno != EINTR || dead))
765 765 return (-1);
766 766 if (cc == 0) /* EOF */
767 767 return (-1);
768 768 if (cc == -1) /* The read was interrupted. */
769 769 return (0);
770 770
771 771 do {
772 772 int len;
773 773
774 774 len = write(out_fd, ibuf + wrote, cc - wrote);
775 775 if (len == -1 && errno != EINTR)
776 776 return (-1);
777 777 if (len != -1)
778 778 wrote += len;
779 779 } while (wrote < cc);
780 780
781 781 return (0);
782 782 }
783 783
784 784 /*
785 785 * This is the main I/O loop, and is shared across all zlogin modes.
786 786 * Parameters:
787 787 * stdin_fd: The fd representing 'stdin' for the slave side; input to
788 788 * the zone will be written here.
789 789 *
790 790 * appin_fd: The fd representing the other end of the 'stdin' pipe (when
791 791 * we're running non-interactive); used in process_raw_input
792 792 * to ensure we don't fill up the application's stdin pipe.
793 793 *
794 794 * stdout_fd: The fd representing 'stdout' for the slave side; output
795 795 * from the zone will arrive here.
796 796 *
797 797 * stderr_fd: The fd representing 'stderr' for the slave side; output
798 798 * from the zone will arrive here.
799 799 *
800 800 * raw_mode: If TRUE, then no processing (for example, for '~.') will
801 801 * be performed on the input coming from STDIN.
802 802 *
803 803 * stderr_fd may be specified as -1 if there is no stderr (only non-interactive
804 804 * mode supplies a stderr).
805 805 *
806 806 */
807 807 static void
808 808 doio(int stdin_fd, int appin_fd, int stdout_fd, int stderr_fd, int sig_fd,
809 809 boolean_t raw_mode)
810 810 {
811 811 struct pollfd pollfds[4];
812 812 char ibuf[ZLOGIN_BUFSIZ];
813 813 int cc, ret;
814 814
815 815 /* read from stdout of zone and write to stdout of global zone */
816 816 pollfds[0].fd = stdout_fd;
817 817 pollfds[0].events = POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI;
818 818
819 819 /* read from stderr of zone and write to stderr of global zone */
820 820 pollfds[1].fd = stderr_fd;
821 821 pollfds[1].events = pollfds[0].events;
822 822
823 823 /* read from stdin of global zone and write to stdin of zone */
824 824 pollfds[2].fd = STDIN_FILENO;
825 825 pollfds[2].events = pollfds[0].events;
826 826
827 827 /* read from signalling pipe so we know when child dies */
828 828 pollfds[3].fd = sig_fd;
829 829 pollfds[3].events = pollfds[0].events;
830 830
831 831 for (;;) {
832 832 pollfds[0].revents = pollfds[1].revents =
833 833 pollfds[2].revents = pollfds[3].revents = 0;
834 834
835 835 if (dead)
836 836 break;
837 837
838 838 /*
839 839 * There is a race condition here where we can receive the
840 840 * child death signal, set the dead flag, but since we have
841 841 * passed the test above, we would go into poll and hang.
842 842 * To avoid this we use the sig_fd as an additional poll fd.
843 843 * The signal handler writes into the other end of this pipe
844 844 * when the child dies so that the poll will always see that
845 845 * input and proceed. We just loop around at that point and
846 846 * then notice the dead flag.
847 847 */
848 848
849 849 ret = poll(pollfds,
850 850 sizeof (pollfds) / sizeof (struct pollfd), -1);
851 851
852 852 if (ret == -1 && errno != EINTR) {
853 853 perror("poll failed");
854 854 break;
855 855 }
856 856
857 857 if (errno == EINTR && dead) {
858 858 break;
859 859 }
860 860
861 861 /* event from master side stdout */
862 862 if (pollfds[0].revents) {
863 863 if (pollfds[0].revents &
864 864 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
865 865 if (process_output(stdout_fd, STDOUT_FILENO)
866 866 != 0)
867 867 break;
868 868 } else {
869 869 pollerr = pollfds[0].revents;
870 870 break;
871 871 }
872 872 }
873 873
874 874 /* event from master side stderr */
875 875 if (pollfds[1].revents) {
876 876 if (pollfds[1].revents &
877 877 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
878 878 if (process_output(stderr_fd, STDERR_FILENO)
879 879 != 0)
880 880 break;
881 881 } else {
882 882 pollerr = pollfds[1].revents;
883 883 break;
884 884 }
885 885 }
886 886
887 887 /* event from user STDIN side */
888 888 if (pollfds[2].revents) {
889 889 if (pollfds[2].revents &
890 890 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
891 891 /*
892 892 * stdin fd is stdin of the target; so,
893 893 * the thing we'll write the user data *to*.
894 894 *
895 895 * Also, unlike on the output side, we
896 896 * close the pipe on a zero-length message.
897 897 */
898 898 int res;
899 899
900 900 if (raw_mode)
901 901 res = process_raw_input(stdin_fd,
902 902 appin_fd);
903 903 else
904 904 res = process_user_input(stdin_fd,
905 905 stdout_fd);
906 906
907 907 if (res < 0)
908 908 break;
909 909 if (res > 0) {
910 910 /* EOF (close) child's stdin_fd */
911 911 pollfds[2].fd = -1;
912 912 while ((res = close(stdin_fd)) != 0 &&
913 913 errno == EINTR)
914 914 ;
915 915 if (res != 0)
916 916 break;
917 917 }
918 918
919 919 } else if (raw_mode && pollfds[2].revents & POLLHUP) {
920 920 /*
921 921 * It's OK to get a POLLHUP on STDIN-- it
922 922 * always happens if you do:
923 923 *
924 924 * echo foo | zlogin <zone> <command>
925 925 *
926 926 * We reset fd to -1 in this case to clear
927 927 * the condition and close the pipe (EOF) to
928 928 * the other side in order to wrap things up.
929 929 */
930 930 int res;
931 931
932 932 pollfds[2].fd = -1;
933 933 while ((res = close(stdin_fd)) != 0 &&
934 934 errno == EINTR)
935 935 ;
936 936 if (res != 0)
937 937 break;
938 938 } else {
939 939 pollerr = pollfds[2].revents;
940 940 break;
941 941 }
942 942 }
943 943 }
944 944
945 945 /*
946 946 * We are in the midst of dying, but try to poll with a short
947 947 * timeout to see if we can catch the last bit of I/O from the
948 948 * children.
949 949 */
950 950 retry:
951 951 pollfds[0].revents = pollfds[1].revents = 0;
952 952 (void) poll(pollfds, 2, 100);
953 953 if (pollfds[0].revents &
954 954 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
955 955 if ((cc = read(stdout_fd, ibuf, ZLOGIN_BUFSIZ)) > 0) {
956 956 (void) write(STDOUT_FILENO, ibuf, cc);
957 957 goto retry;
958 958 }
959 959 }
960 960 if (pollfds[1].revents &
961 961 (POLLIN | POLLRDNORM | POLLRDBAND | POLLPRI)) {
962 962 if ((cc = read(stderr_fd, ibuf, ZLOGIN_BUFSIZ)) > 0) {
963 963 (void) write(STDERR_FILENO, ibuf, cc);
964 964 goto retry;
965 965 }
966 966 }
967 967 }
968 968
969 969 /*
970 970 * Fetch the user_cmd brand hook for getting a user's passwd(4) entry.
971 971 */
972 972 static const char *
973 973 zone_get_user_cmd(brand_handle_t bh, const char *login, char *user_cmd,
974 974 size_t len)
975 975 {
976 976 bzero(user_cmd, sizeof (user_cmd));
977 977 if (brand_get_user_cmd(bh, login, user_cmd, len) != 0)
978 978 return (NULL);
979 979
980 980 return (user_cmd);
981 981 }
982 982
983 983 /* From libc */
984 984 extern int str2passwd(const char *, int, void *, char *, int);
985 985
986 986 /*
987 987 * exec() the user_cmd brand hook, and convert the output string to a
988 988 * struct passwd. This is to be called after zone_enter().
989 989 *
990 990 */
991 991 static struct passwd *
992 992 zone_get_user_pw(const char *user_cmd, struct passwd *pwent, char *pwbuf,
993 993 int pwbuflen)
994 994 {
995 995 char pwline[NSS_BUFLEN_PASSWD];
996 996 char *cin = NULL;
997 997 FILE *fin;
998 998 int status;
999 999
1000 1000 assert(getzoneid() != GLOBAL_ZONEID);
1001 1001
1002 1002 if ((fin = popen(user_cmd, "r")) == NULL)
1003 1003 return (NULL);
1004 1004
1005 1005 while (cin == NULL && !feof(fin))
1006 1006 cin = fgets(pwline, sizeof (pwline), fin);
1007 1007
1008 1008 if (cin == NULL) {
1009 1009 (void) pclose(fin);
1010 1010 return (NULL);
1011 1011 }
1012 1012
1013 1013 status = pclose(fin);
1014 1014 if (!WIFEXITED(status))
1015 1015 return (NULL);
1016 1016 if (WEXITSTATUS(status) != 0)
1017 1017 return (NULL);
1018 1018
1019 1019 if (str2passwd(pwline, sizeof (pwline), pwent, pwbuf, pwbuflen) == 0)
1020 1020 return (pwent);
1021 1021 else
1022 1022 return (NULL);
1023 1023 }
1024 1024
1025 1025 static char **
1026 1026 zone_login_cmd(brand_handle_t bh, const char *login)
1027 1027 {
1028 1028 static char result_buf[ARG_MAX];
1029 1029 char **new_argv, *ptr, *lasts;
1030 1030 int n, a;
1031 1031
1032 1032 /* Get the login command for the target zone. */
1033 1033 bzero(result_buf, sizeof (result_buf));
1034 1034
1035 1035 if (forced_login) {
1036 1036 if (brand_get_forcedlogin_cmd(bh, login,
1037 1037 result_buf, sizeof (result_buf)) != 0)
1038 1038 return (NULL);
1039 1039 } else {
1040 1040 if (brand_get_login_cmd(bh, login,
1041 1041 result_buf, sizeof (result_buf)) != 0)
1042 1042 return (NULL);
1043 1043 }
1044 1044
1045 1045 /*
1046 1046 * We got back a string that we'd like to execute. But since
1047 1047 * we're not doing the execution via a shell we'll need to convert
1048 1048 * the exec string to an array of strings. We'll do that here
1049 1049 * but we're going to be very simplistic about it and break stuff
1050 1050 * up based on spaces. We're not even going to support any kind
1051 1051 * of quoting or escape characters. It's truly amazing that
1052 1052 * there is no library function in OpenSolaris to do this for us.
1053 1053 */
1054 1054
1055 1055 /*
1056 1056 * Be paranoid. Since we're deliniating based on spaces make
1057 1057 * sure there are no adjacent spaces.
1058 1058 */
1059 1059 if (strstr(result_buf, " ") != NULL)
1060 1060 return (NULL);
1061 1061
1062 1062 /* Remove any trailing whitespace. */
1063 1063 n = strlen(result_buf);
1064 1064 if (result_buf[n - 1] == ' ')
1065 1065 result_buf[n - 1] = '\0';
1066 1066
1067 1067 /* Count how many elements there are in the exec string. */
1068 1068 ptr = result_buf;
1069 1069 for (n = 2; ((ptr = strchr(ptr + 1, (int)' ')) != NULL); n++)
1070 1070 ;
1071 1071
1072 1072 /* Allocate the argv array that we're going to return. */
1073 1073 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1074 1074 return (NULL);
1075 1075
1076 1076 /* Tokenize the exec string and return. */
1077 1077 a = 0;
1078 1078 new_argv[a++] = result_buf;
1079 1079 if (n > 2) {
1080 1080 (void) strtok_r(result_buf, " ", &lasts);
1081 1081 while ((new_argv[a++] = strtok_r(NULL, " ", &lasts)) != NULL)
1082 1082 ;
1083 1083 } else {
1084 1084 new_argv[a++] = NULL;
1085 1085 }
1086 1086 assert(n == a);
1087 1087 return (new_argv);
1088 1088 }
1089 1089
1090 1090 /*
1091 1091 * Prepare argv array for exec'd process; if we're passing commands to the
1092 1092 * new process, then use su(1M) to do the invocation. Otherwise, use
1093 1093 * 'login -z <from_zonename> -f' (-z is an undocumented option which tells
1094 1094 * login that we're coming from another zone, and to disregard its CONSOLE
1095 1095 * checks).
1096 1096 */
1097 1097 static char **
1098 1098 prep_args(brand_handle_t bh, const char *login, char **argv)
1099 1099 {
1100 1100 int argc = 0, a = 0, i, n = -1;
1101 1101 char **new_argv;
1102 1102
1103 1103 if (argv != NULL) {
1104 1104 size_t subshell_len = 1;
1105 1105 char *subshell;
1106 1106
1107 1107 while (argv[argc] != NULL)
1108 1108 argc++;
1109 1109
1110 1110 for (i = 0; i < argc; i++) {
1111 1111 subshell_len += strlen(argv[i]) + 1;
1112 1112 }
1113 1113 if ((subshell = calloc(1, subshell_len)) == NULL)
1114 1114 return (NULL);
1115 1115
1116 1116 for (i = 0; i < argc; i++) {
1117 1117 (void) strcat(subshell, argv[i]);
1118 1118 (void) strcat(subshell, " ");
1119 1119 }
1120 1120
1121 1121 if (failsafe) {
1122 1122 n = 4;
1123 1123 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1124 1124 return (NULL);
1125 1125
1126 1126 new_argv[a++] = FAILSAFESHELL;
1127 1127 } else {
1128 1128 n = 5;
1129 1129 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1130 1130 return (NULL);
1131 1131
1132 1132 new_argv[a++] = SUPATH;
1133 1133 if (strcmp(login, "root") != 0) {
1134 1134 new_argv[a++] = "-";
1135 1135 n++;
1136 1136 }
1137 1137 new_argv[a++] = (char *)login;
1138 1138 }
1139 1139 new_argv[a++] = "-c";
1140 1140 new_argv[a++] = subshell;
1141 1141 new_argv[a++] = NULL;
1142 1142 assert(a == n);
1143 1143 } else {
1144 1144 if (failsafe) {
1145 1145 n = 2;
1146 1146 if ((new_argv = malloc(sizeof (char *) * n)) == NULL)
1147 1147 return (NULL);
1148 1148 new_argv[a++] = FAILSAFESHELL;
1149 1149 new_argv[a++] = NULL;
1150 1150 assert(n == a);
1151 1151 } else {
1152 1152 new_argv = zone_login_cmd(bh, login);
1153 1153 }
1154 1154 }
1155 1155
1156 1156 return (new_argv);
1157 1157 }
1158 1158
1159 1159 /*
1160 1160 * Helper routine for prep_env below.
1161 1161 */
1162 1162 static char *
1163 1163 add_env(char *name, char *value)
1164 1164 {
1165 1165 size_t sz = strlen(name) + strlen(value) + 2; /* name, =, value, NUL */
1166 1166 char *str;
1167 1167
1168 1168 if ((str = malloc(sz)) == NULL)
1169 1169 return (NULL);
1170 1170
1171 1171 (void) snprintf(str, sz, "%s=%s", name, value);
1172 1172 return (str);
1173 1173 }
1174 1174
1175 1175 /*
1176 1176 * Prepare envp array for exec'd process.
1177 1177 */
1178 1178 static char **
1179 1179 prep_env()
1180 1180 {
1181 1181 int e = 0, size = 1;
1182 1182 char **new_env, *estr;
1183 1183 char *term = getenv("TERM");
1184 1184
1185 1185 size++; /* for $PATH */
1186 1186 if (term != NULL)
1187 1187 size++;
1188 1188
1189 1189 /*
1190 1190 * In failsafe mode we set $HOME, since '-l' isn't valid in this mode.
1191 1191 * We also set $SHELL, since neither login nor su will be around to do
1192 1192 * it.
1193 1193 */
1194 1194 if (failsafe)
1195 1195 size += 2;
1196 1196
1197 1197 if ((new_env = malloc(sizeof (char *) * size)) == NULL)
1198 1198 return (NULL);
1199 1199
1200 1200 if ((estr = add_env("PATH", DEF_PATH)) == NULL)
1201 1201 return (NULL);
1202 1202 new_env[e++] = estr;
1203 1203
1204 1204 if (term != NULL) {
1205 1205 if ((estr = add_env("TERM", term)) == NULL)
1206 1206 return (NULL);
1207 1207 new_env[e++] = estr;
1208 1208 }
1209 1209
1210 1210 if (failsafe) {
1211 1211 if ((estr = add_env("HOME", "/")) == NULL)
1212 1212 return (NULL);
1213 1213 new_env[e++] = estr;
1214 1214
1215 1215 if ((estr = add_env("SHELL", FAILSAFESHELL)) == NULL)
1216 1216 return (NULL);
1217 1217 new_env[e++] = estr;
1218 1218 }
1219 1219
1220 1220 new_env[e++] = NULL;
1221 1221
1222 1222 assert(e == size);
1223 1223
1224 1224 return (new_env);
1225 1225 }
1226 1226
1227 1227 /*
1228 1228 * Finish the preparation of the envp array for exec'd non-interactive
1229 1229 * zlogins. This is called in the child process *after* we zone_enter(), since
1230 1230 * it derives things we can only know within the zone, such as $HOME, $SHELL,
1231 1231 * etc. We need only do this in the non-interactive, mode, since otherwise
1232 1232 * login(1) will do it. We don't do this in failsafe mode, since it presents
1233 1233 * additional ways in which the command could fail, and we'd prefer to avoid
1234 1234 * that.
1235 1235 */
1236 1236 static char **
1237 1237 prep_env_noninteractive(const char *user_cmd, char **env)
1238 1238 {
1239 1239 size_t size;
1240 1240 char **new_env;
1241 1241 int e, i;
1242 1242 char *estr;
1243 1243 char varmail[LOGNAME_MAX + 11]; /* strlen(/var/mail/) = 10, NUL */
1244 1244 char pwbuf[NSS_BUFLEN_PASSWD + 1];
1245 1245 struct passwd pwent;
1246 1246 struct passwd *pw = NULL;
1247 1247
1248 1248 assert(env != NULL);
1249 1249 assert(failsafe == 0);
1250 1250
1251 1251 /*
1252 1252 * Exec the "user_cmd" brand hook to get a pwent for the
1253 1253 * login user. If this fails, HOME will be set to "/", SHELL
1254 1254 * will be set to $DEFAULTSHELL, and we will continue to exec
1255 1255 * SUPATH <login> -c <cmd>.
1256 1256 */
1257 1257 pw = zone_get_user_pw(user_cmd, &pwent, pwbuf, sizeof (pwbuf));
1258 1258
1259 1259 /*
1260 1260 * Get existing envp size.
1261 1261 */
1262 1262 for (size = 0; env[size] != NULL; size++)
1263 1263 ;
1264 1264
1265 1265 e = size;
1266 1266
1267 1267 /*
1268 1268 * Finish filling out the environment; we duplicate the environment
1269 1269 * setup described in login(1), for lack of a better precedent.
1270 1270 */
1271 1271 if (pw != NULL)
1272 1272 size += 3; /* LOGNAME, HOME, MAIL */
1273 1273 else
1274 1274 size += 1; /* HOME */
1275 1275
1276 1276 size++; /* always fill in SHELL */
1277 1277 size++; /* terminating NULL */
1278 1278
1279 1279 if ((new_env = malloc(sizeof (char *) * size)) == NULL)
1280 1280 goto malloc_fail;
1281 1281
1282 1282 /*
1283 1283 * Copy existing elements of env into new_env.
1284 1284 */
1285 1285 for (i = 0; env[i] != NULL; i++) {
1286 1286 if ((new_env[i] = strdup(env[i])) == NULL)
1287 1287 goto malloc_fail;
1288 1288 }
1289 1289 assert(e == i);
1290 1290
1291 1291 if (pw != NULL) {
1292 1292 if ((estr = add_env("LOGNAME", pw->pw_name)) == NULL)
1293 1293 goto malloc_fail;
1294 1294 new_env[e++] = estr;
1295 1295
1296 1296 if ((estr = add_env("HOME", pw->pw_dir)) == NULL)
1297 1297 goto malloc_fail;
1298 1298 new_env[e++] = estr;
1299 1299
1300 1300 if (chdir(pw->pw_dir) != 0)
1301 1301 zerror(gettext("Could not chdir to home directory "
1302 1302 "%s: %s"), pw->pw_dir, strerror(errno));
1303 1303
1304 1304 (void) snprintf(varmail, sizeof (varmail), "/var/mail/%s",
1305 1305 pw->pw_name);
1306 1306 if ((estr = add_env("MAIL", varmail)) == NULL)
1307 1307 goto malloc_fail;
1308 1308 new_env[e++] = estr;
1309 1309 } else {
1310 1310 if ((estr = add_env("HOME", "/")) == NULL)
1311 1311 goto malloc_fail;
1312 1312 new_env[e++] = estr;
1313 1313 }
1314 1314
1315 1315 if (pw != NULL && strlen(pw->pw_shell) > 0) {
1316 1316 if ((estr = add_env("SHELL", pw->pw_shell)) == NULL)
1317 1317 goto malloc_fail;
1318 1318 new_env[e++] = estr;
1319 1319 } else {
1320 1320 if ((estr = add_env("SHELL", DEFAULTSHELL)) == NULL)
1321 1321 goto malloc_fail;
1322 1322 new_env[e++] = estr;
1323 1323 }
1324 1324
1325 1325 new_env[e++] = NULL; /* add terminating NULL */
1326 1326
1327 1327 assert(e == size);
1328 1328 return (new_env);
1329 1329
1330 1330 malloc_fail:
1331 1331 zperror(gettext("failed to allocate memory for process environment"));
1332 1332 return (NULL);
1333 1333 }
1334 1334
1335 1335 static int
1336 1336 close_func(void *slavefd, int fd)
1337 1337 {
1338 1338 if (fd != *(int *)slavefd)
1339 1339 (void) close(fd);
1340 1340 return (0);
1341 1341 }
1342 1342
1343 1343 static void
1344 1344 set_cmdchar(char *cmdcharstr)
1345 1345 {
1346 1346 char c;
1347 1347 long lc;
1348 1348
1349 1349 if ((c = *cmdcharstr) != '\\') {
1350 1350 cmdchar = c;
1351 1351 return;
1352 1352 }
1353 1353
1354 1354 c = cmdcharstr[1];
1355 1355 if (c == '\0' || c == '\\') {
1356 1356 cmdchar = '\\';
1357 1357 return;
1358 1358 }
1359 1359
1360 1360 if (c < '0' || c > '7') {
1361 1361 zerror(gettext("Unrecognized escape character option %s"),
1362 1362 cmdcharstr);
1363 1363 usage();
1364 1364 }
1365 1365
1366 1366 lc = strtol(cmdcharstr + 1, NULL, 8);
1367 1367 if (lc < 0 || lc > 255) {
1368 1368 zerror(gettext("Octal escape character '%s' too large"),
1369 1369 cmdcharstr);
1370 1370 usage();
1371 1371 }
1372 1372 cmdchar = (char)lc;
1373 1373 }
1374 1374
1375 1375 static int
1376 1376 setup_utmpx(char *slavename)
1377 1377 {
1378 1378 struct utmpx ut;
1379 1379
1380 1380 bzero(&ut, sizeof (ut));
1381 1381 (void) strncpy(ut.ut_user, ".zlogin", sizeof (ut.ut_user));
1382 1382 (void) strncpy(ut.ut_line, slavename, sizeof (ut.ut_line));
1383 1383 ut.ut_pid = getpid();
1384 1384 ut.ut_id[0] = 'z';
1385 1385 ut.ut_id[1] = ut.ut_id[2] = ut.ut_id[3] = (char)SC_WILDC;
1386 1386 ut.ut_type = LOGIN_PROCESS;
1387 1387 (void) time(&ut.ut_tv.tv_sec);
1388 1388
1389 1389 if (makeutx(&ut) == NULL) {
1390 1390 zerror(gettext("makeutx failed"));
1391 1391 return (-1);
1392 1392 }
1393 1393 return (0);
1394 1394 }
1395 1395
1396 1396 static void
1397 1397 release_lock_file(int lockfd)
1398 1398 {
1399 1399 (void) close(lockfd);
1400 1400 }
1401 1401
1402 1402 static int
1403 1403 grab_lock_file(const char *zone_name, int *lockfd)
1404 1404 {
1405 1405 char pathbuf[PATH_MAX];
1406 1406 struct flock flock;
1407 1407
1408 1408 if (mkdir(ZONES_TMPDIR, S_IRWXU) < 0 && errno != EEXIST) {
1409 1409 zerror(gettext("could not mkdir %s: %s"), ZONES_TMPDIR,
1410 1410 strerror(errno));
1411 1411 return (-1);
1412 1412 }
1413 1413 (void) chmod(ZONES_TMPDIR, S_IRWXU);
1414 1414 (void) snprintf(pathbuf, sizeof (pathbuf), "%s/%s.zoneadm.lock",
1415 1415 ZONES_TMPDIR, zone_name);
1416 1416
1417 1417 if ((*lockfd = open(pathbuf, O_RDWR|O_CREAT, S_IRUSR|S_IWUSR)) < 0) {
1418 1418 zerror(gettext("could not open %s: %s"), pathbuf,
1419 1419 strerror(errno));
1420 1420 return (-1);
1421 1421 }
1422 1422 /*
1423 1423 * Lock the file to synchronize with other zoneadmds
1424 1424 */
1425 1425 flock.l_type = F_WRLCK;
1426 1426 flock.l_whence = SEEK_SET;
1427 1427 flock.l_start = (off_t)0;
1428 1428 flock.l_len = (off_t)0;
1429 1429 if (fcntl(*lockfd, F_SETLKW, &flock) < 0) {
1430 1430 zerror(gettext("unable to lock %s: %s"), pathbuf,
1431 1431 strerror(errno));
1432 1432 release_lock_file(*lockfd);
1433 1433 return (-1);
1434 1434 }
1435 1435 return (Z_OK);
1436 1436 }
1437 1437
1438 1438 static int
1439 1439 start_zoneadmd(const char *zone_name)
1440 1440 {
1441 1441 pid_t retval;
1442 1442 int pstatus = 0, error = -1, lockfd, doorfd;
1443 1443 struct door_info info;
1444 1444 char doorpath[MAXPATHLEN];
1445 1445
1446 1446 (void) snprintf(doorpath, sizeof (doorpath), ZONE_DOOR_PATH, zone_name);
1447 1447
1448 1448 if (grab_lock_file(zone_name, &lockfd) != Z_OK)
1449 1449 return (-1);
1450 1450 /*
1451 1451 * We must do the door check with the lock held. Otherwise, we
1452 1452 * might race against another zoneadm/zlogin process and wind
1453 1453 * up with two processes trying to start zoneadmd at the same
1454 1454 * time. zoneadmd will detect this, and fail, but we prefer this
1455 1455 * to be as seamless as is practical, from a user perspective.
1456 1456 */
1457 1457 if ((doorfd = open(doorpath, O_RDONLY)) < 0) {
1458 1458 if (errno != ENOENT) {
1459 1459 zerror("failed to open %s: %s", doorpath,
1460 1460 strerror(errno));
1461 1461 goto out;
1462 1462 }
1463 1463 } else {
1464 1464 /*
1465 1465 * Seems to be working ok.
1466 1466 */
1467 1467 if (door_info(doorfd, &info) == 0 &&
1468 1468 ((info.di_attributes & DOOR_REVOKED) == 0)) {
1469 1469 error = 0;
1470 1470 goto out;
1471 1471 }
1472 1472 }
1473 1473
1474 1474 if ((child_pid = fork()) == -1) {
1475 1475 zperror(gettext("could not fork"));
1476 1476 goto out;
1477 1477 } else if (child_pid == 0) {
1478 1478 /* child process */
1479 1479 (void) execl("/usr/lib/zones/zoneadmd", "zoneadmd", "-z",
1480 1480 zone_name, NULL);
1481 1481 zperror(gettext("could not exec zoneadmd"));
1482 1482 _exit(1);
1483 1483 }
1484 1484
1485 1485 /* parent process */
1486 1486 do {
1487 1487 retval = waitpid(child_pid, &pstatus, 0);
1488 1488 } while (retval != child_pid);
1489 1489 if (WIFSIGNALED(pstatus) ||
1490 1490 (WIFEXITED(pstatus) && WEXITSTATUS(pstatus) != 0)) {
1491 1491 zerror(gettext("could not start %s"), "zoneadmd");
1492 1492 goto out;
1493 1493 }
1494 1494 error = 0;
1495 1495 out:
1496 1496 release_lock_file(lockfd);
1497 1497 (void) close(doorfd);
1498 1498 return (error);
1499 1499 }
1500 1500
1501 1501 static int
1502 1502 init_template(void)
1503 1503 {
1504 1504 int fd;
1505 1505 int err = 0;
1506 1506
1507 1507 fd = open64(CTFS_ROOT "/process/template", O_RDWR);
1508 1508 if (fd == -1)
1509 1509 return (-1);
1510 1510
1511 1511 /*
1512 1512 * zlogin doesn't do anything with the contract.
1513 1513 * Deliver no events, don't inherit, and allow it to be orphaned.
1514 1514 */
1515 1515 err |= ct_tmpl_set_critical(fd, 0);
1516 1516 err |= ct_tmpl_set_informative(fd, 0);
1517 1517 err |= ct_pr_tmpl_set_fatal(fd, CT_PR_EV_HWERR);
1518 1518 err |= ct_pr_tmpl_set_param(fd, CT_PR_PGRPONLY | CT_PR_REGENT);
1519 1519 if (err || ct_tmpl_activate(fd)) {
1520 1520 (void) close(fd);
1521 1521 return (-1);
1522 1522 }
1523 1523
1524 1524 return (fd);
1525 1525 }
1526 1526
1527 1527 static int
1528 1528 noninteractive_login(char *zonename, const char *user_cmd, zoneid_t zoneid,
1529 1529 char **new_args, char **new_env)
1530 1530 {
1531 1531 pid_t retval;
1532 1532 int stdin_pipe[2], stdout_pipe[2], stderr_pipe[2], dead_child_pipe[2];
1533 1533 int child_status;
1534 1534 int tmpl_fd;
1535 1535 sigset_t block_cld;
1536 1536
1537 1537 if ((tmpl_fd = init_template()) == -1) {
1538 1538 reset_tty();
1539 1539 zperror(gettext("could not create contract"));
1540 1540 return (1);
1541 1541 }
1542 1542
1543 1543 if (pipe(stdin_pipe) != 0) {
1544 1544 zperror(gettext("could not create STDIN pipe"));
1545 1545 return (1);
1546 1546 }
1547 1547 /*
1548 1548 * When the user types ^D, we get a zero length message on STDIN.
1549 1549 * We need to echo that down the pipe to send it to the other side;
1550 1550 * but by default, pipes don't propagate zero-length messages. We
1551 1551 * toggle that behavior off using I_SWROPT. See streamio(7i).
1552 1552 */
1553 1553 if (ioctl(stdin_pipe[0], I_SWROPT, SNDZERO) != 0) {
1554 1554 zperror(gettext("could not configure STDIN pipe"));
1555 1555 return (1);
1556 1556
1557 1557 }
1558 1558 if (pipe(stdout_pipe) != 0) {
1559 1559 zperror(gettext("could not create STDOUT pipe"));
1560 1560 return (1);
1561 1561 }
1562 1562 if (pipe(stderr_pipe) != 0) {
1563 1563 zperror(gettext("could not create STDERR pipe"));
1564 1564 return (1);
1565 1565 }
1566 1566
1567 1567 if (pipe(dead_child_pipe) != 0) {
1568 1568 zperror(gettext("could not create signalling pipe"));
1569 1569 return (1);
1570 1570 }
1571 1571 close_on_sig = dead_child_pipe[0];
1572 1572
1573 1573 /*
1574 1574 * If any of the pipe FD's winds up being less than STDERR, then we
1575 1575 * have a mess on our hands-- and we are lacking some of the I/O
1576 1576 * streams we would expect anyway. So we bail.
1577 1577 */
1578 1578 if (stdin_pipe[0] <= STDERR_FILENO ||
1579 1579 stdin_pipe[1] <= STDERR_FILENO ||
1580 1580 stdout_pipe[0] <= STDERR_FILENO ||
1581 1581 stdout_pipe[1] <= STDERR_FILENO ||
1582 1582 stderr_pipe[0] <= STDERR_FILENO ||
1583 1583 stderr_pipe[1] <= STDERR_FILENO ||
1584 1584 dead_child_pipe[0] <= STDERR_FILENO ||
1585 1585 dead_child_pipe[1] <= STDERR_FILENO) {
1586 1586 zperror(gettext("process lacks valid STDIN, STDOUT, STDERR"));
1587 1587 return (1);
1588 1588 }
1589 1589
1590 1590 if (prefork_dropprivs() != 0) {
1591 1591 zperror(gettext("could not allocate privilege set"));
1592 1592 return (1);
1593 1593 }
1594 1594
1595 1595 (void) sigset(SIGCLD, sigcld);
1596 1596 (void) sigemptyset(&block_cld);
1597 1597 (void) sigaddset(&block_cld, SIGCLD);
1598 1598 (void) sigprocmask(SIG_BLOCK, &block_cld, NULL);
1599 1599
1600 1600 if ((child_pid = fork()) == -1) {
1601 1601 (void) ct_tmpl_clear(tmpl_fd);
1602 1602 (void) close(tmpl_fd);
1603 1603 zperror(gettext("could not fork"));
1604 1604 return (1);
1605 1605 } else if (child_pid == 0) { /* child process */
1606 1606 (void) ct_tmpl_clear(tmpl_fd);
1607 1607
1608 1608 /*
1609 1609 * Do a dance to get the pipes hooked up as FD's 0, 1 and 2.
1610 1610 */
1611 1611 (void) close(STDIN_FILENO);
1612 1612 (void) close(STDOUT_FILENO);
1613 1613 (void) close(STDERR_FILENO);
1614 1614 (void) dup2(stdin_pipe[1], STDIN_FILENO);
1615 1615 (void) dup2(stdout_pipe[1], STDOUT_FILENO);
1616 1616 (void) dup2(stderr_pipe[1], STDERR_FILENO);
1617 1617 (void) closefrom(STDERR_FILENO + 1);
1618 1618
1619 1619 (void) sigset(SIGCLD, SIG_DFL);
1620 1620 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
1621 1621 /*
1622 1622 * In case any of stdin, stdout or stderr are streams,
1623 1623 * anchor them to prevent malicious I_POPs.
1624 1624 */
1625 1625 (void) ioctl(STDIN_FILENO, I_ANCHOR);
1626 1626 (void) ioctl(STDOUT_FILENO, I_ANCHOR);
1627 1627 (void) ioctl(STDERR_FILENO, I_ANCHOR);
1628 1628
1629 1629 if (zone_enter(zoneid) == -1) {
1630 1630 zerror(gettext("could not enter zone %s: %s"),
1631 1631 zonename, strerror(errno));
1632 1632 _exit(1);
1633 1633 }
1634 1634
1635 1635 /*
1636 1636 * For non-native zones, tell libc where it can find locale
1637 1637 * specific getttext() messages.
1638 1638 */
1639 1639 if (access("/.SUNWnative/usr/lib/locale", R_OK) == 0)
1640 1640 (void) bindtextdomain(TEXT_DOMAIN,
1641 1641 "/.SUNWnative/usr/lib/locale");
1642 1642 else if (access("/native/usr/lib/locale", R_OK) == 0)
1643 1643 (void) bindtextdomain(TEXT_DOMAIN,
1644 1644 "/native/usr/lib/locale");
1645 1645
1646 1646 if (!failsafe)
1647 1647 new_env = prep_env_noninteractive(user_cmd, new_env);
1648 1648
1649 1649 if (new_env == NULL) {
1650 1650 _exit(1);
1651 1651 }
1652 1652
1653 1653 /*
1654 1654 * Move into a new process group; the zone_enter will have
1655 1655 * placed us into zsched's session, and we want to be in
1656 1656 * a unique process group.
1657 1657 */
1658 1658 (void) setpgid(getpid(), getpid());
1659 1659
1660 1660 /*
1661 1661 * The child needs to run as root to
1662 1662 * execute the su program.
1663 1663 */
1664 1664 if (setuid(0) == -1) {
1665 1665 zperror(gettext("insufficient privilege"));
1666 1666 return (1);
1667 1667 }
1668 1668
1669 1669 (void) execve(new_args[0], new_args, new_env);
1670 1670 zperror(gettext("exec failure"));
1671 1671 _exit(1);
1672 1672 }
1673 1673 /* parent */
1674 1674
1675 1675 /* close pipe sides written by child */
1676 1676 (void) close(stdout_pipe[1]);
1677 1677 (void) close(stderr_pipe[1]);
1678 1678
1679 1679 (void) sigset(SIGINT, sig_forward);
1680 1680
1681 1681 postfork_dropprivs();
1682 1682
1683 1683 (void) ct_tmpl_clear(tmpl_fd);
1684 1684 (void) close(tmpl_fd);
1685 1685
1686 1686 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
1687 1687 doio(stdin_pipe[0], stdin_pipe[1], stdout_pipe[0], stderr_pipe[0],
1688 1688 dead_child_pipe[1], B_TRUE);
1689 1689 do {
1690 1690 retval = waitpid(child_pid, &child_status, 0);
1691 1691 if (retval == -1) {
1692 1692 child_status = 0;
1693 1693 }
1694 1694 } while (retval != child_pid && errno != ECHILD);
1695 1695
1696 1696 return (WEXITSTATUS(child_status));
1697 1697 }
1698 1698
1699 1699 static char *
1700 1700 get_username()
1701 1701 {
1702 1702 uid_t uid;
1703 1703 struct passwd *nptr;
1704 1704
1705 1705 /*
1706 1706 * Authorizations are checked to restrict access based on the
1707 1707 * requested operation and zone name, It is assumed that the
1708 1708 * program is running with all privileges, but that the real
1709 1709 * user ID is that of the user or role on whose behalf we are
1710 1710 * operating. So we start by getting the username that will be
1711 1711 * used for subsequent authorization checks.
1712 1712 */
1713 1713
1714 1714 uid = getuid();
1715 1715 if ((nptr = getpwuid(uid)) == NULL) {
1716 1716 zerror(gettext("could not get user name."));
1717 1717 _exit(1);
1718 1718 }
1719 1719 return (nptr->pw_name);
1720 1720 }
1721 1721
1722 1722 int
1723 1723 main(int argc, char **argv)
1724 1724 {
1725 1725 int arg, console = 0;
1726 1726 zoneid_t zoneid;
1727 1727 zone_state_t st;
1728 1728 char *login = "root";
1729 1729 int lflag = 0;
1730 1730 char *zonename = NULL;
1731 1731 char **proc_args = NULL;
1732 1732 char **new_args, **new_env;
1733 1733 sigset_t block_cld;
1734 1734 char devroot[MAXPATHLEN];
1735 1735 char *slavename, slaveshortname[MAXPATHLEN];
1736 1736 priv_set_t *privset;
1737 1737 int tmpl_fd;
1738 1738 char zonebrand[MAXNAMELEN];
1739 1739 char default_brand[MAXNAMELEN];
1740 1740 struct stat sb;
1741 1741 char kernzone[ZONENAME_MAX];
1742 1742 brand_handle_t bh;
1743 1743 char user_cmd[MAXPATHLEN];
1744 1744 char authname[MAXAUTHS];
1745 1745
1746 1746 (void) setlocale(LC_ALL, "");
1747 1747 (void) textdomain(TEXT_DOMAIN);
1748 1748
1749 1749 (void) getpname(argv[0]);
1750 1750 username = get_username();
1751 1751
1752 1752 while ((arg = getopt(argc, argv, "ECR:Se:l:")) != EOF) {
1753 1753 switch (arg) {
1754 1754 case 'C':
1755 1755 console = 1;
1756 1756 break;
1757 1757 case 'E':
1758 1758 nocmdchar = 1;
1759 1759 break;
1760 1760 case 'R': /* undocumented */
1761 1761 if (*optarg != '/') {
1762 1762 zerror(gettext("root path must be absolute."));
1763 1763 exit(2);
1764 1764 }
1765 1765 if (stat(optarg, &sb) == -1 || !S_ISDIR(sb.st_mode)) {
1766 1766 zerror(
1767 1767 gettext("root path must be a directory."));
1768 1768 exit(2);
1769 1769 }
1770 1770 zonecfg_set_root(optarg);
1771 1771 break;
1772 1772 case 'S':
1773 1773 failsafe = 1;
1774 1774 break;
1775 1775 case 'e':
1776 1776 set_cmdchar(optarg);
1777 1777 break;
1778 1778 case 'l':
1779 1779 login = optarg;
1780 1780 lflag = 1;
1781 1781 break;
1782 1782 default:
1783 1783 usage();
1784 1784 }
1785 1785 }
1786 1786
1787 1787 if (console != 0 && lflag != 0) {
1788 1788 zerror(gettext("-l may not be specified for console login"));
1789 1789 usage();
1790 1790 }
1791 1791
1792 1792 if (console != 0 && failsafe != 0) {
1793 1793 zerror(gettext("-S may not be specified for console login"));
1794 1794 usage();
1795 1795 }
1796 1796
1797 1797 if (console != 0 && zonecfg_in_alt_root()) {
1798 1798 zerror(gettext("-R may not be specified for console login"));
1799 1799 exit(2);
1800 1800 }
1801 1801
1802 1802 if (failsafe != 0 && lflag != 0) {
1803 1803 zerror(gettext("-l may not be specified for failsafe login"));
1804 1804 usage();
1805 1805 }
1806 1806
1807 1807 if (optind == (argc - 1)) {
1808 1808 /*
1809 1809 * zone name, no process name; this should be an interactive
1810 1810 * as long as STDIN is really a tty.
1811 1811 */
1812 1812 if (isatty(STDIN_FILENO))
1813 1813 interactive = 1;
1814 1814 zonename = argv[optind];
1815 1815 } else if (optind < (argc - 1)) {
1816 1816 if (console) {
1817 1817 zerror(gettext("Commands may not be specified for "
1818 1818 "console login."));
1819 1819 usage();
1820 1820 }
1821 1821 /* zone name and process name, and possibly some args */
1822 1822 zonename = argv[optind];
1823 1823 proc_args = &argv[optind + 1];
1824 1824 interactive = 0;
1825 1825 } else {
1826 1826 usage();
1827 1827 }
1828 1828
1829 1829 if (getzoneid() != GLOBAL_ZONEID) {
1830 1830 zerror(gettext("'%s' may only be used from the global zone"),
1831 1831 pname);
1832 1832 return (1);
1833 1833 }
1834 1834
1835 1835 if (strcmp(zonename, GLOBAL_ZONENAME) == 0) {
1836 1836 zerror(gettext("'%s' not applicable to the global zone"),
1837 1837 pname);
1838 1838 return (1);
1839 1839 }
1840 1840
1841 1841 if (zone_get_state(zonename, &st) != Z_OK) {
1842 1842 zerror(gettext("zone '%s' unknown"), zonename);
1843 1843 return (1);
1844 1844 }
1845 1845
1846 1846 if (st < ZONE_STATE_INSTALLED) {
1847 1847 zerror(gettext("cannot login to a zone which is '%s'"),
1848 1848 zone_state_str(st));
1849 1849 return (1);
1850 1850 }
1851 1851
1852 1852 /*
1853 1853 * In both console and non-console cases, we require all privs.
1854 1854 * In the console case, because we may need to startup zoneadmd.
1855 1855 * In the non-console case in order to do zone_enter(2), zonept()
1856 1856 * and other tasks.
1857 1857 */
1858 1858
1859 1859 if ((privset = priv_allocset()) == NULL) {
1860 1860 zperror(gettext("priv_allocset failed"));
1861 1861 return (1);
1862 1862 }
1863 1863
1864 1864 if (getppriv(PRIV_EFFECTIVE, privset) != 0) {
1865 1865 zperror(gettext("getppriv failed"));
1866 1866 priv_freeset(privset);
1867 1867 return (1);
1868 1868 }
1869 1869
1870 1870 if (priv_isfullset(privset) == B_FALSE) {
1871 1871 zerror(gettext("You lack sufficient privilege to run "
1872 1872 "this command (all privs required)"));
1873 1873 priv_freeset(privset);
1874 1874 return (1);
1875 1875 }
1876 1876 priv_freeset(privset);
1877 1877
1878 1878 /*
1879 1879 * Check if user is authorized for requested usage of the zone
1880 1880 */
1881 1881
1882 1882 (void) snprintf(authname, MAXAUTHS, "%s%s%s",
1883 1883 ZONE_MANAGE_AUTH, KV_OBJECT, zonename);
1884 1884 if (chkauthattr(authname, username) == 0) {
1885 1885 if (console) {
1886 1886 zerror(gettext("%s is not authorized for console "
1887 1887 "access to %s zone."),
1888 1888 username, zonename);
1889 1889 return (1);
1890 1890 } else {
1891 1891 (void) snprintf(authname, MAXAUTHS, "%s%s%s",
1892 1892 ZONE_LOGIN_AUTH, KV_OBJECT, zonename);
1893 1893 if (failsafe || !interactive) {
1894 1894 zerror(gettext("%s is not authorized for "
1895 1895 "failsafe or non-interactive login "
1896 1896 "to %s zone."), username, zonename);
1897 1897 return (1);
1898 1898 } else if (chkauthattr(authname, username) == 0) {
1899 1899 zerror(gettext("%s is not authorized "
1900 1900 " to login to %s zone."),
1901 1901 username, zonename);
1902 1902 return (1);
1903 1903 }
1904 1904 }
1905 1905 } else {
1906 1906 forced_login = B_TRUE;
1907 1907 }
1908 1908
1909 1909 /*
1910 1910 * The console is a separate case from the rest of the code; handle
1911 1911 * it first.
1912 1912 */
1913 1913 if (console) {
1914 1914 /*
1915 1915 * Ensure that zoneadmd for this zone is running.
1916 1916 */
1917 1917 if (start_zoneadmd(zonename) == -1)
1918 1918 return (1);
1919 1919
1920 1920 /*
1921 1921 * Make contact with zoneadmd.
1922 1922 */
1923 1923 if (get_console_master(zonename) == -1)
1924 1924 return (1);
1925 1925
1926 1926 (void) printf(gettext("[Connected to zone '%s' console]\n"),
1927 1927 zonename);
1928 1928
1929 1929 if (set_tty_rawmode(STDIN_FILENO) == -1) {
1930 1930 reset_tty();
1931 1931 zperror(gettext("failed to set stdin pty to raw mode"));
1932 1932 return (1);
1933 1933 }
1934 1934
1935 1935 (void) sigset(SIGWINCH, sigwinch);
1936 1936 (void) sigwinch(0);
1937 1937
1938 1938 /*
1939 1939 * Run the I/O loop until we get disconnected.
1940 1940 */
1941 1941 doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
1942 1942 reset_tty();
1943 1943 (void) printf(gettext("\n[Connection to zone '%s' console "
1944 1944 "closed]\n"), zonename);
1945 1945
1946 1946 return (0);
1947 1947 }
1948 1948
1949 1949 if (st != ZONE_STATE_RUNNING && st != ZONE_STATE_MOUNTED) {
1950 1950 zerror(gettext("login allowed only to running zones "
1951 1951 "(%s is '%s')."), zonename, zone_state_str(st));
1952 1952 return (1);
1953 1953 }
1954 1954
1955 1955 (void) strlcpy(kernzone, zonename, sizeof (kernzone));
1956 1956 if (zonecfg_in_alt_root()) {
1957 1957 FILE *fp = zonecfg_open_scratch("", B_FALSE);
1958 1958
1959 1959 if (fp == NULL || zonecfg_find_scratch(fp, zonename,
1960 1960 zonecfg_get_root(), kernzone, sizeof (kernzone)) == -1) {
1961 1961 zerror(gettext("cannot find scratch zone %s"),
1962 1962 zonename);
1963 1963 if (fp != NULL)
1964 1964 zonecfg_close_scratch(fp);
1965 1965 return (1);
1966 1966 }
1967 1967 zonecfg_close_scratch(fp);
1968 1968 }
1969 1969
1970 1970 if ((zoneid = getzoneidbyname(kernzone)) == -1) {
1971 1971 zerror(gettext("failed to get zoneid for zone '%s'"),
1972 1972 zonename);
1973 1973 return (1);
1974 1974 }
1975 1975
1976 1976 /*
1977 1977 * We need the zone root path only if we are setting up a pty.
1978 1978 */
1979 1979 if (zone_get_devroot(zonename, devroot, sizeof (devroot)) == -1) {
1980 1980 zerror(gettext("could not get dev path for zone %s"),
1981 1981 zonename);
1982 1982 return (1);
1983 1983 }
1984 1984
1985 1985 if (zone_get_brand(zonename, zonebrand, sizeof (zonebrand)) != Z_OK) {
1986 1986 zerror(gettext("could not get brand for zone %s"), zonename);
1987 1987 return (1);
1988 1988 }
1989 1989 /*
1990 1990 * In the alternate root environment, the only supported
1991 1991 * operations are mount and unmount. In this case, just treat
1992 1992 * the zone as native if it is cluster. Cluster zones can be
1993 1993 * native for the purpose of LU or upgrade, and the cluster
1994 1994 * brand may not exist in the miniroot (such as in net install
1995 1995 * upgrade).
1996 1996 */
1997 1997 if (zonecfg_default_brand(default_brand,
1998 1998 sizeof (default_brand)) != Z_OK) {
1999 1999 zerror(gettext("unable to determine default brand"));
2000 2000 return (1);
2001 2001 }
2002 2002 if (zonecfg_in_alt_root() &&
2003 2003 strcmp(zonebrand, CLUSTER_BRAND_NAME) == 0) {
2004 2004 (void) strlcpy(zonebrand, default_brand, sizeof (zonebrand));
2005 2005 }
2006 2006
2007 2007 if ((bh = brand_open(zonebrand)) == NULL) {
2008 2008 zerror(gettext("could not open brand for zone %s"), zonename);
2009 2009 return (1);
2010 2010 }
2011 2011
2012 2012 if ((new_args = prep_args(bh, login, proc_args)) == NULL) {
2013 2013 zperror(gettext("could not assemble new arguments"));
2014 2014 brand_close(bh);
2015 2015 return (1);
2016 2016 }
2017 2017 /*
2018 2018 * Get the brand specific user_cmd. This command is used to get
2019 2019 * a passwd(4) entry for login.
2020 2020 */
2021 2021 if (!interactive && !failsafe) {
2022 2022 if (zone_get_user_cmd(bh, login, user_cmd,
2023 2023 sizeof (user_cmd)) == NULL) {
2024 2024 zerror(gettext("could not get user_cmd for zone %s"),
2025 2025 zonename);
2026 2026 brand_close(bh);
2027 2027 return (1);
2028 2028 }
2029 2029 }
2030 2030 brand_close(bh);
2031 2031
2032 2032 if ((new_env = prep_env()) == NULL) {
2033 2033 zperror(gettext("could not assemble new environment"));
2034 2034 return (1);
2035 2035 }
2036 2036
2037 2037 if (!interactive)
2038 2038 return (noninteractive_login(zonename, user_cmd, zoneid,
2039 2039 new_args, new_env));
2040 2040
2041 2041 if (zonecfg_in_alt_root()) {
2042 2042 zerror(gettext("cannot use interactive login with scratch "
2043 2043 "zone"));
2044 2044 return (1);
2045 2045 }
2046 2046
2047 2047 /*
2048 2048 * Things are more complex in interactive mode; we get the
2049 2049 * master side of the pty, then place the user's terminal into
2050 2050 * raw mode.
2051 2051 */
2052 2052 if (get_master_pty() == -1) {
2053 2053 zerror(gettext("could not setup master pty device"));
2054 2054 return (1);
2055 2055 }
2056 2056
2057 2057 /*
2058 2058 * Compute the "short name" of the pts. /dev/pts/2 --> pts/2
2059 2059 */
2060 2060 if ((slavename = ptsname(masterfd)) == NULL) {
2061 2061 zperror(gettext("failed to get name for pseudo-tty"));
2062 2062 return (1);
2063 2063 }
2064 2064 if (strncmp(slavename, "/dev/", strlen("/dev/")) == 0)
2065 2065 (void) strlcpy(slaveshortname, slavename + strlen("/dev/"),
2066 2066 sizeof (slaveshortname));
2067 2067 else
2068 2068 (void) strlcpy(slaveshortname, slavename,
2069 2069 sizeof (slaveshortname));
2070 2070
2071 2071 (void) printf(gettext("[Connected to zone '%s' %s]\n"), zonename,
2072 2072 slaveshortname);
2073 2073
2074 2074 if (set_tty_rawmode(STDIN_FILENO) == -1) {
2075 2075 reset_tty();
2076 2076 zperror(gettext("failed to set stdin pty to raw mode"));
2077 2077 return (1);
2078 2078 }
2079 2079
2080 2080 if (prefork_dropprivs() != 0) {
2081 2081 reset_tty();
2082 2082 zperror(gettext("could not allocate privilege set"));
2083 2083 return (1);
2084 2084 }
2085 2085
2086 2086 /*
2087 2087 * We must mask SIGCLD until after we have coped with the fork
2088 2088 * sufficiently to deal with it; otherwise we can race and receive the
2089 2089 * signal before child_pid has been initialized (yes, this really
2090 2090 * happens).
2091 2091 */
2092 2092 (void) sigset(SIGCLD, sigcld);
2093 2093 (void) sigemptyset(&block_cld);
2094 2094 (void) sigaddset(&block_cld, SIGCLD);
2095 2095 (void) sigprocmask(SIG_BLOCK, &block_cld, NULL);
2096 2096
2097 2097 /*
2098 2098 * We activate the contract template at the last minute to
2099 2099 * avoid intermediate functions that could be using fork(2)
2100 2100 * internally.
2101 2101 */
2102 2102 if ((tmpl_fd = init_template()) == -1) {
2103 2103 reset_tty();
2104 2104 zperror(gettext("could not create contract"));
2105 2105 return (1);
2106 2106 }
2107 2107
2108 2108 if ((child_pid = fork()) == -1) {
2109 2109 (void) ct_tmpl_clear(tmpl_fd);
2110 2110 reset_tty();
2111 2111 zperror(gettext("could not fork"));
2112 2112 return (1);
2113 2113 } else if (child_pid == 0) { /* child process */
2114 2114 int slavefd, newslave;
2115 2115
2116 2116 (void) ct_tmpl_clear(tmpl_fd);
2117 2117 (void) close(tmpl_fd);
2118 2118
2119 2119 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
2120 2120
2121 2121 if ((slavefd = init_slave_pty(zoneid, devroot)) == -1)
2122 2122 return (1);
2123 2123
2124 2124 /*
2125 2125 * Close all fds except for the slave pty.
2126 2126 */
2127 2127 (void) fdwalk(close_func, &slavefd);
2128 2128
2129 2129 /*
2130 2130 * Temporarily dup slavefd to stderr; that way if we have
2131 2131 * to print out that zone_enter failed, the output will
2132 2132 * have somewhere to go.
2133 2133 */
2134 2134 if (slavefd != STDERR_FILENO)
2135 2135 (void) dup2(slavefd, STDERR_FILENO);
2136 2136
2137 2137 if (zone_enter(zoneid) == -1) {
2138 2138 zerror(gettext("could not enter zone %s: %s"),
2139 2139 zonename, strerror(errno));
2140 2140 return (1);
2141 2141 }
2142 2142
2143 2143 if (slavefd != STDERR_FILENO)
2144 2144 (void) close(STDERR_FILENO);
2145 2145
2146 2146 /*
2147 2147 * We take pains to get this process into a new process
2148 2148 * group, and subsequently a new session. In this way,
2149 2149 * we'll have a session which doesn't yet have a controlling
2150 2150 * terminal. When we open the slave, it will become the
2151 2151 * controlling terminal; no PIDs concerning pgrps or sids
2152 2152 * will leak inappropriately into the zone.
2153 2153 */
2154 2154 (void) setpgrp();
2155 2155
2156 2156 /*
2157 2157 * We need the slave pty to be referenced from the zone's
2158 2158 * /dev in order to ensure that the devt's, etc are all
2159 2159 * correct. Otherwise we break ttyname and the like.
2160 2160 */
2161 2161 if ((newslave = open(slavename, O_RDWR)) == -1) {
2162 2162 (void) close(slavefd);
2163 2163 return (1);
2164 2164 }
2165 2165 (void) close(slavefd);
2166 2166 slavefd = newslave;
2167 2167
2168 2168 /*
2169 2169 * dup the slave to the various FDs, so that when the
2170 2170 * spawned process does a write/read it maps to the slave
2171 2171 * pty.
2172 2172 */
2173 2173 (void) dup2(slavefd, STDIN_FILENO);
|
↓ open down ↓ |
2173 lines elided |
↑ open up ↑ |
2174 2174 (void) dup2(slavefd, STDOUT_FILENO);
2175 2175 (void) dup2(slavefd, STDERR_FILENO);
2176 2176 if (slavefd != STDIN_FILENO && slavefd != STDOUT_FILENO &&
2177 2177 slavefd != STDERR_FILENO) {
2178 2178 (void) close(slavefd);
2179 2179 }
2180 2180
2181 2181 /*
2182 2182 * In failsafe mode, we don't use login(1), so don't try
2183 2183 * setting up a utmpx entry.
2184 + *
2185 + * A branded zone may have very different utmpx semantics.
2186 + * At the moment, we only have two brand types:
2187 + * Solaris-like (native, sn1) and Linux. In the Solaris
2188 + * case, we know exactly how to do the necessary utmpx
2189 + * setup. Fortunately for us, the Linux /bin/login is
2190 + * prepared to deal with a non-initialized utmpx entry, so
2191 + * we can simply skip it. If future brands don't fall into
2192 + * either category, we'll have to add a per-brand utmpx
2193 + * setup hook.
2184 2194 */
2185 - if (!failsafe)
2195 + if (!failsafe && (strcmp(zonebrand, "lx") != 0))
2186 2196 if (setup_utmpx(slaveshortname) == -1)
2187 2197 return (1);
2188 2198
2189 2199 /*
2190 2200 * The child needs to run as root to
2191 2201 * execute the brand's login program.
2192 2202 */
2193 2203 if (setuid(0) == -1) {
2194 2204 zperror(gettext("insufficient privilege"));
2195 2205 return (1);
2196 2206 }
2197 2207
2198 2208 (void) execve(new_args[0], new_args, new_env);
2199 2209 zperror(gettext("exec failure"));
2200 2210 return (1);
2201 2211 }
2202 2212
2203 2213 (void) ct_tmpl_clear(tmpl_fd);
2204 2214 (void) close(tmpl_fd);
2205 2215
2206 2216 /*
2207 2217 * The rest is only for the parent process.
2208 2218 */
2209 2219 (void) sigset(SIGWINCH, sigwinch);
2210 2220
2211 2221 postfork_dropprivs();
2212 2222
2213 2223 (void) sigprocmask(SIG_UNBLOCK, &block_cld, NULL);
2214 2224 doio(masterfd, -1, masterfd, -1, -1, B_FALSE);
2215 2225
2216 2226 reset_tty();
2217 2227 (void) fprintf(stderr,
2218 2228 gettext("\n[Connection to zone '%s' %s closed]\n"), zonename,
2219 2229 slaveshortname);
2220 2230
2221 2231 if (pollerr != 0) {
2222 2232 (void) fprintf(stderr, gettext("Error: connection closed due "
2223 2233 "to unexpected pollevents=0x%x.\n"), pollerr);
2224 2234 return (1);
2225 2235 }
2226 2236
2227 2237 return (0);
2228 2238 }
|
↓ open down ↓ |
33 lines elided |
↑ open up ↑ |
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX