Line data Source code
1 : /*
2 : Unix SMB/CIFS implementation.
3 : Samba utility functions
4 : Copyright (C) Andrew Tridgell 1992-1998
5 : Copyright (C) Andrew Bartlett 2001-2004
6 :
7 : This program is free software; you can redistribute it and/or modify
8 : it under the terms of the GNU General Public License as published by
9 : the Free Software Foundation; either version 3 of the License, or
10 : (at your option) any later version.
11 :
12 : This program is distributed in the hope that it will be useful,
13 : but WITHOUT ANY WARRANTY; without even the implied warranty of
14 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 : GNU General Public License for more details.
16 :
17 : You should have received a copy of the GNU General Public License
18 : along with this program. If not, see <http://www.gnu.org/licenses/>.
19 : */
20 :
21 : /* These comments regard the code to change the user's unix password: */
22 :
23 : /* fork a child process to exec passwd and write to its
24 : * tty to change a users password. This is running as the
25 : * user who is attempting to change the password.
26 : */
27 :
28 : /*
29 : * This code was copied/borrowed and stolen from various sources.
30 : * The primary source was the poppasswd.c from the authors of POPMail. This software
31 : * was included as a client to change passwords using the 'passwd' program
32 : * on the remote machine.
33 : *
34 : * This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson
35 : * (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences
36 : * and rights to modify, distribute or incorporate this change to the CAP suite or
37 : * using it for any other reason are granted, so long as this disclaimer is left intact.
38 : */
39 :
40 : /*
41 : This code was hacked considerably for inclusion in Samba, primarily
42 : by Andrew.Tridgell@anu.edu.au. The biggest change was the addition
43 : of the "password chat" option, which allows the easy runtime
44 : specification of the expected sequence of events to change a
45 : password.
46 : */
47 :
48 : #include "includes.h"
49 : #include "system/terminal.h"
50 : #include "system/passwd.h"
51 : #include "system/filesys.h"
52 : #include "../libcli/auth/libcli_auth.h"
53 : #include "rpc_server/samr/srv_samr_util.h"
54 : #include "passdb.h"
55 : #include "auth.h"
56 : #include "lib/util/sys_rw.h"
57 : #include "librpc/rpc/dcerpc_samr.h"
58 :
59 : #include "lib/crypto/gnutls_helpers.h"
60 : #include <gnutls/gnutls.h>
61 : #include <gnutls/crypto.h>
62 :
63 : #undef DBGC_CLASS
64 : #define DBGC_CLASS DBGC_RPC_SRV
65 :
66 : #ifndef ALLOW_CHANGE_PASSWORD
67 : #if (defined(HAVE_TERMIOS_H) && defined(HAVE_DUP2) && defined(HAVE_SETSID))
68 : #define ALLOW_CHANGE_PASSWORD 1
69 : #endif
70 : #endif
71 :
72 : #if ALLOW_CHANGE_PASSWORD
73 :
74 0 : static int findpty(char **slave)
75 : {
76 0 : int master = -1;
77 0 : char *line = NULL;
78 0 : DIR *dirp = NULL;
79 0 : const char *dpname;
80 :
81 0 : *slave = NULL;
82 :
83 : #if defined(HAVE_GRANTPT)
84 : #if defined(HAVE_POSIX_OPENPT)
85 0 : master = posix_openpt(O_RDWR|O_NOCTTY);
86 : #else
87 : /* Try to open /dev/ptmx. If that fails, fall through to old method. */
88 : master = open("/dev/ptmx", O_RDWR, 0);
89 : #endif
90 0 : if (master >= 0) {
91 0 : grantpt(master);
92 0 : unlockpt(master);
93 0 : line = (char *)ptsname(master);
94 0 : if (line) {
95 0 : *slave = SMB_STRDUP(line);
96 : }
97 :
98 0 : if (*slave == NULL) {
99 0 : DEBUG(0,
100 : ("findpty: Unable to create master/slave pty pair.\n"));
101 : /* Stop fd leak on error. */
102 0 : close(master);
103 0 : return -1;
104 : } else {
105 0 : DEBUG(10,
106 : ("findpty: Allocated slave pty %s\n", *slave));
107 0 : return (master);
108 : }
109 : }
110 : #endif /* HAVE_GRANTPT */
111 :
112 0 : line = SMB_STRDUP("/dev/ptyXX");
113 0 : if (!line) {
114 0 : return (-1);
115 : }
116 :
117 0 : dirp = opendir("/dev");
118 0 : if (!dirp) {
119 0 : SAFE_FREE(line);
120 0 : return (-1);
121 : }
122 :
123 0 : while ((dpname = readdirname(dirp)) != NULL) {
124 0 : if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5) {
125 0 : DEBUG(3,
126 : ("pty: try to open %s, line was %s\n", dpname,
127 : line));
128 0 : line[8] = dpname[3];
129 0 : line[9] = dpname[4];
130 0 : if ((master = open(line, O_RDWR, 0)) >= 0) {
131 0 : DEBUG(3, ("pty: opened %s\n", line));
132 0 : line[5] = 't';
133 0 : *slave = line;
134 0 : closedir(dirp);
135 0 : return (master);
136 : }
137 : }
138 : }
139 0 : closedir(dirp);
140 0 : SAFE_FREE(line);
141 0 : return (-1);
142 : }
143 :
144 0 : static int dochild(int master, const char *slavedev, const struct passwd *pass,
145 : const char *passwordprogram, bool as_root)
146 : {
147 0 : int slave;
148 0 : struct termios stermios;
149 0 : gid_t gid;
150 0 : uid_t uid;
151 0 : char * const eptrs[1] = { NULL };
152 :
153 0 : if (pass == NULL)
154 : {
155 0 : DEBUG(0,
156 : ("dochild: user doesn't exist in the UNIX password database.\n"));
157 0 : return False;
158 : }
159 :
160 0 : gid = pass->pw_gid;
161 0 : uid = pass->pw_uid;
162 :
163 0 : gain_root_privilege();
164 :
165 : /* Start new session - gets rid of controlling terminal. */
166 0 : if (setsid() < 0)
167 : {
168 0 : DEBUG(3,
169 : ("Weirdness, couldn't let go of controlling terminal\n"));
170 0 : return (False);
171 : }
172 :
173 : /* Open slave pty and acquire as new controlling terminal. */
174 0 : if ((slave = open(slavedev, O_RDWR, 0)) < 0)
175 : {
176 0 : DEBUG(3, ("More weirdness, could not open %s\n", slavedev));
177 0 : return (False);
178 : }
179 : #if defined(TIOCSCTTY) && !defined(SUNOS5)
180 : /*
181 : * On patched Solaris 10 TIOCSCTTY is defined but seems not to work,
182 : * see the discussion under
183 : * https://bugzilla.samba.org/show_bug.cgi?id=5366.
184 : */
185 0 : if (ioctl(slave, TIOCSCTTY, 0) < 0)
186 : {
187 0 : DEBUG(3, ("Error in ioctl call for slave pty\n"));
188 : /* return(False); */
189 : }
190 : #elif defined(I_PUSH) && defined(I_FIND)
191 : if (ioctl(slave, I_FIND, "ptem") == 0) {
192 : ioctl(slave, I_PUSH, "ptem");
193 : }
194 : if (ioctl(slave, I_FIND, "ldterm") == 0) {
195 : ioctl(slave, I_PUSH, "ldterm");
196 : }
197 : #endif
198 :
199 : /* Close master. */
200 0 : close(master);
201 :
202 : /* Make slave stdin/out/err of child. */
203 :
204 0 : if (dup2(slave, STDIN_FILENO) != STDIN_FILENO)
205 : {
206 0 : DEBUG(3, ("Could not re-direct stdin\n"));
207 0 : return (False);
208 : }
209 0 : if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
210 : {
211 0 : DEBUG(3, ("Could not re-direct stdout\n"));
212 0 : return (False);
213 : }
214 0 : if (dup2(slave, STDERR_FILENO) != STDERR_FILENO)
215 : {
216 0 : DEBUG(3, ("Could not re-direct stderr\n"));
217 0 : return (False);
218 : }
219 0 : if (slave > 2)
220 0 : close(slave);
221 :
222 : /* Set proper terminal attributes - no echo, canonical input processing,
223 : no map NL to CR/NL on output. */
224 :
225 0 : if (tcgetattr(0, &stermios) < 0)
226 : {
227 0 : DEBUG(3,
228 : ("could not read default terminal attributes on pty\n"));
229 0 : return (False);
230 : }
231 0 : stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
232 0 : stermios.c_lflag |= ICANON;
233 : #ifdef ONLCR
234 0 : stermios.c_oflag &= ~(ONLCR);
235 : #endif
236 0 : if (tcsetattr(0, TCSANOW, &stermios) < 0)
237 : {
238 0 : DEBUG(3, ("could not set attributes of pty\n"));
239 0 : return (False);
240 : }
241 :
242 : /* make us completely into the right uid */
243 0 : if (!as_root)
244 : {
245 0 : become_user_permanently(uid, gid);
246 : }
247 :
248 0 : DEBUG(10,
249 : ("Invoking '%s' as password change program.\n",
250 : passwordprogram));
251 :
252 : /* execl() password-change application */
253 0 : if (execle("/bin/sh", "sh", "-c", passwordprogram, NULL, eptrs) < 0)
254 : {
255 0 : DEBUG(3, ("Bad status returned from %s\n", passwordprogram));
256 0 : return (False);
257 : }
258 0 : return (True);
259 : }
260 :
261 0 : static int expect(int master, char *issue, char *expected)
262 : {
263 0 : char buffer[1024];
264 0 : int attempts, timeout, nread;
265 0 : size_t len;
266 0 : bool match = False;
267 :
268 0 : for (attempts = 0; attempts < 2; attempts++) {
269 0 : NTSTATUS status;
270 0 : if (!strequal(issue, ".")) {
271 0 : if (lp_passwd_chat_debug())
272 0 : DEBUG(100, ("expect: sending [%s]\n", issue));
273 :
274 0 : if ((len = sys_write(master, issue, strlen(issue))) != strlen(issue)) {
275 0 : DEBUG(2,("expect: (short) write returned %d\n",
276 : (int)len ));
277 0 : return False;
278 : }
279 : }
280 :
281 0 : if (strequal(expected, "."))
282 0 : return True;
283 :
284 : /* Initial timeout. */
285 0 : timeout = lp_passwd_chat_timeout() * 1000;
286 0 : nread = 0;
287 0 : buffer[nread] = 0;
288 :
289 0 : while (True) {
290 0 : status = read_fd_with_timeout(
291 : master, buffer + nread, 1,
292 : sizeof(buffer) - nread - 1,
293 : timeout, &len);
294 :
295 0 : if (!NT_STATUS_IS_OK(status)) {
296 0 : DEBUG(2, ("expect: read error %s\n",
297 : nt_errstr(status)));
298 0 : break;
299 : }
300 0 : nread += len;
301 0 : buffer[nread] = 0;
302 :
303 : {
304 : /* Eat leading/trailing whitespace before match. */
305 0 : char *str = SMB_STRDUP(buffer);
306 0 : if (!str) {
307 0 : DEBUG(2,("expect: ENOMEM\n"));
308 0 : return False;
309 : }
310 0 : trim_char(str, ' ', ' ');
311 :
312 0 : if ((match = unix_wild_match(expected, str)) == True) {
313 : /* Now data has started to return, lower timeout. */
314 0 : timeout = lp_passwd_chat_timeout() * 100;
315 : }
316 0 : SAFE_FREE(str);
317 : }
318 : }
319 :
320 0 : if (lp_passwd_chat_debug())
321 0 : DEBUG(100, ("expect: expected [%s] received [%s] match %s\n",
322 : expected, buffer, match ? "yes" : "no" ));
323 :
324 0 : if (match)
325 0 : break;
326 :
327 0 : if (!NT_STATUS_IS_OK(status)) {
328 0 : DEBUG(2, ("expect: %s\n", nt_errstr(status)));
329 0 : return False;
330 : }
331 : }
332 :
333 0 : DEBUG(10,("expect: returning %s\n", match ? "True" : "False" ));
334 0 : return match;
335 : }
336 :
337 0 : static void pwd_sub(char *buf)
338 : {
339 0 : all_string_sub(buf, "\\n", "\n", 0);
340 0 : all_string_sub(buf, "\\r", "\r", 0);
341 0 : all_string_sub(buf, "\\s", " ", 0);
342 0 : all_string_sub(buf, "\\t", "\t", 0);
343 0 : }
344 :
345 0 : static int talktochild(int master, const char *seq)
346 : {
347 0 : TALLOC_CTX *frame = talloc_stackframe();
348 0 : int count = 0;
349 0 : char *issue;
350 0 : char *expected;
351 :
352 0 : issue = talloc_strdup(frame, ".");
353 0 : if (!issue) {
354 0 : TALLOC_FREE(frame);
355 0 : return false;
356 : }
357 :
358 0 : while (next_token_talloc(frame, &seq, &expected, NULL)) {
359 0 : pwd_sub(expected);
360 0 : count++;
361 :
362 0 : if (!expect(master, issue, expected)) {
363 0 : DEBUG(3, ("Response %d incorrect\n", count));
364 0 : TALLOC_FREE(frame);
365 0 : return false;
366 : }
367 :
368 0 : if (!next_token_talloc(frame, &seq, &issue, NULL)) {
369 0 : issue = talloc_strdup(frame, ".");
370 0 : if (!issue) {
371 0 : TALLOC_FREE(frame);
372 0 : return false;
373 : }
374 : }
375 0 : pwd_sub(issue);
376 : }
377 :
378 0 : if (!strequal(issue, ".")) {
379 : /* we have one final issue to send */
380 0 : expected = talloc_strdup(frame, ".");
381 0 : if (!expected) {
382 0 : TALLOC_FREE(frame);
383 0 : return false;
384 : }
385 0 : if (!expect(master, issue, expected)) {
386 0 : TALLOC_FREE(frame);
387 0 : return False;
388 : }
389 : }
390 0 : TALLOC_FREE(frame);
391 0 : return (count > 0);
392 : }
393 :
394 0 : static bool chat_with_program(char *passwordprogram, const struct passwd *pass,
395 : char *chatsequence, bool as_root)
396 : {
397 0 : char *slavedev = NULL;
398 0 : int master;
399 0 : pid_t pid, wpid;
400 0 : int wstat;
401 0 : bool chstat = False;
402 0 : void (*saved_handler)(int);
403 :
404 0 : if (pass == NULL) {
405 0 : DEBUG(0, ("chat_with_program: user doesn't exist in the UNIX password database.\n"));
406 0 : return False;
407 : }
408 :
409 : /* allocate a pseudo-terminal device */
410 0 : if ((master = findpty(&slavedev)) < 0) {
411 0 : DEBUG(3, ("chat_with_program: Cannot Allocate pty for password change: %s\n", pass->pw_name));
412 0 : return (False);
413 : }
414 :
415 : /*
416 : * We need to temporarily stop CatchChild from eating
417 : * SIGCLD signals as it also eats the exit status code. JRA.
418 : */
419 :
420 0 : saved_handler = CatchChildLeaveStatus();
421 :
422 0 : if ((pid = fork()) < 0) {
423 0 : DEBUG(3, ("chat_with_program: Cannot fork() child for password change: %s\n", pass->pw_name));
424 0 : SAFE_FREE(slavedev);
425 0 : close(master);
426 0 : (void)CatchSignal(SIGCLD, saved_handler);
427 0 : return (False);
428 : }
429 :
430 : /* we now have a pty */
431 0 : if (pid > 0) { /* This is the parent process */
432 : /* Don't need this anymore in parent. */
433 0 : SAFE_FREE(slavedev);
434 :
435 0 : if ((chstat = talktochild(master, chatsequence)) == False) {
436 0 : DEBUG(3, ("chat_with_program: Child failed to change password: %s\n", pass->pw_name));
437 0 : kill(pid, SIGKILL); /* be sure to end this process */
438 : }
439 :
440 0 : while ((wpid = waitpid(pid, &wstat, 0)) < 0) {
441 0 : if (errno == EINTR) {
442 0 : errno = 0;
443 0 : continue;
444 : }
445 0 : break;
446 : }
447 :
448 0 : if (wpid < 0) {
449 0 : DEBUG(3, ("chat_with_program: The process is no longer waiting!\n\n"));
450 0 : close(master);
451 0 : (void)CatchSignal(SIGCLD, saved_handler);
452 0 : return (False);
453 : }
454 :
455 : /*
456 : * Go back to ignoring children.
457 : */
458 0 : (void)CatchSignal(SIGCLD, saved_handler);
459 :
460 0 : close(master);
461 :
462 0 : if (pid != wpid) {
463 0 : DEBUG(3, ("chat_with_program: We were waiting for the wrong process ID\n"));
464 0 : return (False);
465 : }
466 0 : if (WIFEXITED(wstat) && (WEXITSTATUS(wstat) != 0)) {
467 0 : DEBUG(3, ("chat_with_program: The process exited with status %d \
468 : while we were waiting\n", WEXITSTATUS(wstat)));
469 0 : return (False);
470 : }
471 : #if defined(WIFSIGNALLED) && defined(WTERMSIG)
472 : else if (WIFSIGNALLED(wstat)) {
473 : DEBUG(3, ("chat_with_program: The process was killed by signal %d \
474 : while we were waiting\n", WTERMSIG(wstat)));
475 : return (False);
476 : }
477 : #endif
478 : } else {
479 : /* CHILD */
480 :
481 : /*
482 : * Lose any elevated privileges.
483 : */
484 0 : drop_effective_capability(KERNEL_OPLOCK_CAPABILITY);
485 0 : drop_effective_capability(DMAPI_ACCESS_CAPABILITY);
486 :
487 : /* make sure it doesn't freeze */
488 0 : alarm(20);
489 :
490 0 : if (as_root)
491 0 : become_root();
492 :
493 0 : DEBUG(3, ("chat_with_program: Dochild for user %s (uid=%d,gid=%d) (as_root = %s)\n", pass->pw_name,
494 : (int)getuid(), (int)getgid(), BOOLSTR(as_root) ));
495 0 : chstat = dochild(master, slavedev, pass, passwordprogram, as_root);
496 :
497 0 : if (as_root)
498 0 : unbecome_root();
499 :
500 : /*
501 : * The child should never return from dochild() ....
502 : */
503 :
504 0 : DEBUG(0, ("chat_with_program: Error: dochild() returned %d\n", chstat));
505 0 : exit(1);
506 : }
507 :
508 0 : if (chstat)
509 0 : DEBUG(3, ("chat_with_program: Password change %ssuccessful for user %s\n",
510 : (chstat ? "" : "un"), pass->pw_name));
511 0 : return (chstat);
512 : }
513 :
514 0 : bool chgpasswd(const char *name, const char *rhost, const struct passwd *pass,
515 : const char *oldpass, const char *newpass, bool as_root)
516 : {
517 0 : const struct loadparm_substitution *lp_sub =
518 0 : loadparm_s3_global_substitution();
519 0 : char *passwordprogram = NULL;
520 0 : char *chatsequence = NULL;
521 0 : size_t i;
522 0 : size_t len;
523 0 : TALLOC_CTX *ctx = talloc_tos();
524 :
525 0 : if (!oldpass) {
526 0 : oldpass = "";
527 : }
528 :
529 0 : DEBUG(3, ("chgpasswd: Password change (as_root=%s) for user: %s\n", BOOLSTR(as_root), name));
530 :
531 : #ifdef DEBUG_PASSWORD
532 0 : DEBUG(100, ("chgpasswd: Passwords: old=%s new=%s\n", oldpass, newpass));
533 : #endif
534 :
535 : /* Take the passed information and test it for minimum criteria */
536 :
537 : /* Password is same as old password */
538 0 : if (strcmp(oldpass, newpass) == 0) {
539 : /* don't allow same password */
540 0 : DEBUG(2, ("chgpasswd: Password Change: %s, New password is same as old\n", name)); /* log the attempt */
541 0 : return (False); /* inform the user */
542 : }
543 :
544 : /*
545 : * Check the old and new passwords don't contain any control
546 : * characters.
547 : */
548 :
549 0 : len = strlen(oldpass);
550 0 : for (i = 0; i < len; i++) {
551 0 : if (iscntrl((int)oldpass[i])) {
552 0 : DEBUG(0, ("chgpasswd: oldpass contains control characters (disallowed).\n"));
553 0 : return False;
554 : }
555 : }
556 :
557 0 : len = strlen(newpass);
558 0 : for (i = 0; i < len; i++) {
559 0 : if (iscntrl((int)newpass[i])) {
560 0 : DEBUG(0, ("chgpasswd: newpass contains control characters (disallowed).\n"));
561 0 : return False;
562 : }
563 : }
564 :
565 : #ifdef WITH_PAM
566 0 : if (lp_pam_password_change()) {
567 0 : bool ret;
568 : #ifdef HAVE_SETLOCALE
569 0 : const char *prevlocale = setlocale(LC_ALL, "C");
570 : #endif
571 :
572 0 : if (as_root)
573 0 : become_root();
574 :
575 0 : if (pass) {
576 0 : ret = smb_pam_passchange(pass->pw_name, rhost,
577 : oldpass, newpass);
578 : } else {
579 0 : ret = smb_pam_passchange(name, rhost, oldpass,
580 : newpass);
581 : }
582 :
583 0 : if (as_root)
584 0 : unbecome_root();
585 :
586 : #ifdef HAVE_SETLOCALE
587 0 : setlocale(LC_ALL, prevlocale);
588 : #endif
589 :
590 0 : return ret;
591 : }
592 : #endif
593 :
594 : /* A non-PAM password change just doesn't make sense without a valid local user */
595 :
596 0 : if (pass == NULL) {
597 0 : DEBUG(0, ("chgpasswd: user %s doesn't exist in the UNIX password database.\n", name));
598 0 : return false;
599 : }
600 :
601 0 : passwordprogram = lp_passwd_program(ctx, lp_sub);
602 0 : if (!passwordprogram || !*passwordprogram) {
603 0 : DEBUG(2, ("chgpasswd: Null password program - no password changing\n"));
604 0 : return false;
605 : }
606 0 : chatsequence = lp_passwd_chat(ctx, lp_sub);
607 0 : if (!chatsequence || !*chatsequence) {
608 0 : DEBUG(2, ("chgpasswd: Null chat sequence - no password changing\n"));
609 0 : return false;
610 : }
611 :
612 0 : if (as_root) {
613 : /* The password program *must* contain the user name to work. Fail if not. */
614 0 : if (strstr_m(passwordprogram, "%u") == NULL) {
615 0 : DEBUG(0,("chgpasswd: Running as root the 'passwd program' parameter *MUST* contain \
616 : the string %%u, and the given string %s does not.\n", passwordprogram ));
617 0 : return false;
618 : }
619 : }
620 :
621 0 : passwordprogram = talloc_string_sub(ctx, passwordprogram, "%u", name);
622 0 : if (!passwordprogram) {
623 0 : return false;
624 : }
625 :
626 : /* note that we do NOT substitute the %o and %n in the password program
627 : as this would open up a security hole where the user could use
628 : a new password containing shell escape characters */
629 :
630 0 : chatsequence = talloc_string_sub(ctx, chatsequence, "%u", name);
631 0 : if (!chatsequence) {
632 0 : return false;
633 : }
634 0 : chatsequence = talloc_all_string_sub(ctx,
635 : chatsequence,
636 : "%o",
637 : oldpass);
638 0 : if (!chatsequence) {
639 0 : return false;
640 : }
641 0 : chatsequence = talloc_all_string_sub(ctx,
642 : chatsequence,
643 : "%n",
644 : newpass);
645 0 : if (chatsequence == NULL) {
646 0 : return false;
647 : }
648 0 : return chat_with_program(passwordprogram,
649 : pass,
650 : chatsequence,
651 : as_root);
652 : }
653 :
654 : #else /* ALLOW_CHANGE_PASSWORD */
655 :
656 : bool chgpasswd(const char *name, const struct passwd *pass,
657 : const char *oldpass, const char *newpass, bool as_root)
658 : {
659 : DEBUG(0, ("chgpasswd: Unix Password changing not compiled in (user=%s)\n", name));
660 : return (False);
661 : }
662 : #endif /* ALLOW_CHANGE_PASSWORD */
663 :
664 : /***********************************************************
665 : Decrypt and verify a user password change.
666 :
667 : The 516 byte long buffers are encrypted with the old NT and
668 : old LM passwords, and if the NT passwords are present, both
669 : buffers contain a unicode string.
670 :
671 : After decrypting the buffers, check the password is correct by
672 : matching the old hashed passwords with the passwords in the passdb.
673 :
674 : ************************************************************/
675 :
676 180 : static NTSTATUS check_oem_password(const char *user,
677 : uchar password_encrypted_with_lm_hash[516],
678 : const uchar old_lm_hash_encrypted[16],
679 : uchar password_encrypted_with_nt_hash[516],
680 : const uchar old_nt_hash_encrypted[16],
681 : struct samu *sampass,
682 : char **pp_new_passwd)
683 : {
684 0 : uchar null_pw[16];
685 0 : uchar null_ntpw[16];
686 0 : uint8_t *password_encrypted;
687 0 : const uint8_t *encryption_key;
688 0 : const uint8_t *lanman_pw, *nt_pw;
689 0 : uint32_t acct_ctrl;
690 0 : size_t new_pw_len;
691 0 : uchar new_nt_hash[16];
692 0 : uchar new_lm_hash[16];
693 0 : uchar verifier[16];
694 0 : char no_pw[2];
695 :
696 180 : bool nt_pass_set = (password_encrypted_with_nt_hash && old_nt_hash_encrypted);
697 180 : bool lm_pass_set = (password_encrypted_with_lm_hash && old_lm_hash_encrypted);
698 180 : enum ntlm_auth_level ntlm_auth_level = lp_ntlm_auth();
699 :
700 180 : gnutls_cipher_hd_t cipher_hnd = NULL;
701 0 : gnutls_datum_t enc_key;
702 0 : int rc;
703 :
704 : /* this call should be disabled without NTLM auth */
705 180 : if (ntlm_auth_level == NTLM_AUTH_DISABLED) {
706 2 : DBG_WARNING("NTLM password changes not"
707 : "permitted by configuration.\n");
708 2 : return NT_STATUS_NTLM_BLOCKED;
709 : }
710 :
711 178 : acct_ctrl = pdb_get_acct_ctrl(sampass);
712 : #if 0
713 : /* I am convinced this check here is wrong, it is valid to
714 : * change a password of a user that has a disabled account - gd */
715 :
716 : if (acct_ctrl & ACB_DISABLED) {
717 : DEBUG(2,("check_lanman_password: account %s disabled.\n", user));
718 : return NT_STATUS_ACCOUNT_DISABLED;
719 : }
720 : #endif
721 178 : if ((acct_ctrl & ACB_PWNOTREQ) && lp_null_passwords()) {
722 : /* construct a null password (in case one is needed */
723 0 : no_pw[0] = 0;
724 0 : no_pw[1] = 0;
725 0 : nt_lm_owf_gen(no_pw, null_ntpw, null_pw);
726 0 : lanman_pw = null_pw;
727 0 : nt_pw = null_pw;
728 :
729 : } else {
730 : /* save pointers to passwords so we don't have to keep looking them up */
731 178 : if (lp_lanman_auth()) {
732 176 : lanman_pw = pdb_get_lanman_passwd(sampass);
733 : } else {
734 2 : lanman_pw = NULL;
735 : }
736 178 : nt_pw = pdb_get_nt_passwd(sampass);
737 : }
738 :
739 178 : if (nt_pw && nt_pass_set) {
740 : /* IDEAL Case: passwords are in unicode, and we can
741 : * read use the password encrypted with the NT hash
742 : */
743 162 : password_encrypted = password_encrypted_with_nt_hash;
744 162 : encryption_key = nt_pw;
745 16 : } else if (lanman_pw && lm_pass_set) {
746 : /* password may still be in unicode, but use LM hash version */
747 14 : password_encrypted = password_encrypted_with_lm_hash;
748 14 : encryption_key = lanman_pw;
749 2 : } else if (nt_pass_set) {
750 0 : DEBUG(1, ("NT password change supplied for user %s, but we have no NT password to check it with\n",
751 : user));
752 0 : return NT_STATUS_WRONG_PASSWORD;
753 2 : } else if (lm_pass_set) {
754 0 : if (lp_lanman_auth()) {
755 0 : DEBUG(1, ("LM password change supplied for user %s, but we have no LanMan password to check it with\n",
756 : user));
757 : } else {
758 0 : DEBUG(1, ("LM password change supplied for user %s, but we have disabled LanMan authentication\n",
759 : user));
760 : }
761 0 : return NT_STATUS_WRONG_PASSWORD;
762 : } else {
763 2 : DEBUG(1, ("password change requested for user %s, but no password supplied!\n",
764 : user));
765 2 : return NT_STATUS_WRONG_PASSWORD;
766 : }
767 :
768 : /*
769 : * Decrypt the password with the key
770 : */
771 176 : enc_key = (gnutls_datum_t) {
772 : .data = discard_const_p(unsigned char, encryption_key),
773 : .size = 16,
774 : };
775 :
776 176 : GNUTLS_FIPS140_SET_LAX_MODE();
777 176 : rc = gnutls_cipher_init(&cipher_hnd,
778 : GNUTLS_CIPHER_ARCFOUR_128,
779 : &enc_key,
780 : NULL);
781 176 : if (rc < 0) {
782 0 : GNUTLS_FIPS140_SET_STRICT_MODE();
783 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
784 : }
785 :
786 176 : rc = gnutls_cipher_decrypt(cipher_hnd,
787 : password_encrypted,
788 : 516);
789 176 : gnutls_cipher_deinit(cipher_hnd);
790 176 : GNUTLS_FIPS140_SET_STRICT_MODE();
791 176 : if (rc < 0) {
792 0 : return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
793 : }
794 :
795 176 : if (!decode_pw_buffer(talloc_tos(),
796 : password_encrypted,
797 : pp_new_passwd,
798 : &new_pw_len,
799 : nt_pass_set ? CH_UTF16 : CH_DOS)) {
800 56 : return NT_STATUS_WRONG_PASSWORD;
801 : }
802 :
803 : /*
804 : * To ensure we got the correct new password, hash it and
805 : * use it as a key to test the passed old password.
806 : */
807 :
808 120 : if (nt_pass_set) {
809 : /* NT passwords, verify the NT hash. */
810 :
811 : /* Calculate the MD4 hash (NT compatible) of the password */
812 110 : memset(new_nt_hash, '\0', 16);
813 110 : E_md4hash(*pp_new_passwd, new_nt_hash);
814 :
815 110 : if (nt_pw) {
816 : /*
817 : * check the NT verifier
818 : */
819 110 : rc = E_old_pw_hash(new_nt_hash, nt_pw, verifier);
820 110 : if (rc != 0) {
821 0 : NTSTATUS status = NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER;
822 0 : return gnutls_error_to_ntstatus(rc, status);
823 : }
824 110 : if (!mem_equal_const_time(verifier, old_nt_hash_encrypted, 16)) {
825 52 : DEBUG(0, ("check_oem_password: old nt "
826 : "password doesn't match.\n"));
827 52 : return NT_STATUS_WRONG_PASSWORD;
828 : }
829 :
830 : /* We could check the LM password here, but there is
831 : * little point, we already know the password is
832 : * correct, and the LM password might not even be
833 : * present. */
834 :
835 : /* Further, LM hash generation algorithms
836 : * differ with charset, so we could
837 : * incorrectly fail a perfectly valid password
838 : * change */
839 : #ifdef DEBUG_PASSWORD
840 58 : DEBUG(100,
841 : ("check_oem_password: password %s ok\n", *pp_new_passwd));
842 : #endif
843 58 : return NT_STATUS_OK;
844 : }
845 :
846 0 : if (lanman_pw) {
847 : /*
848 : * check the lm verifier
849 : */
850 0 : rc = E_old_pw_hash(new_nt_hash, lanman_pw, verifier);
851 0 : if (rc != 0) {
852 0 : NTSTATUS status = NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER;
853 0 : return gnutls_error_to_ntstatus(rc, status);
854 : }
855 0 : if (!mem_equal_const_time(verifier, old_lm_hash_encrypted, 16)) {
856 0 : DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
857 0 : return NT_STATUS_WRONG_PASSWORD;
858 : }
859 : #ifdef DEBUG_PASSWORD
860 0 : DEBUG(100,
861 : ("check_oem_password: password %s ok\n", *pp_new_passwd));
862 : #endif
863 0 : return NT_STATUS_OK;
864 : }
865 : }
866 :
867 10 : if (lanman_pw && lm_pass_set) {
868 :
869 10 : E_deshash(*pp_new_passwd, new_lm_hash);
870 :
871 : /*
872 : * check the lm verifier
873 : */
874 10 : rc = E_old_pw_hash(new_lm_hash, lanman_pw, verifier);
875 10 : if (rc != 0) {
876 0 : NTSTATUS status = NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER;
877 0 : return gnutls_error_to_ntstatus(rc, status);
878 : }
879 10 : if (!mem_equal_const_time(verifier, old_lm_hash_encrypted, 16)) {
880 4 : DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
881 4 : return NT_STATUS_WRONG_PASSWORD;
882 : }
883 :
884 : #ifdef DEBUG_PASSWORD
885 6 : DEBUG(100,
886 : ("check_oem_password: password %s ok\n", *pp_new_passwd));
887 : #endif
888 6 : return NT_STATUS_OK;
889 : }
890 :
891 : /* should not be reached */
892 0 : return NT_STATUS_WRONG_PASSWORD;
893 : }
894 :
895 0 : static bool password_in_history(uint8_t nt_pw[NT_HASH_LEN],
896 : uint32_t pw_history_len,
897 : const uint8_t *pw_history)
898 : {
899 0 : int i;
900 :
901 0 : dump_data(100, nt_pw, NT_HASH_LEN);
902 0 : dump_data(100, pw_history, PW_HISTORY_ENTRY_LEN * pw_history_len);
903 :
904 0 : for (i=0; i<pw_history_len; i++) {
905 0 : uint8_t new_nt_pw_salted_md5_hash[SALTED_MD5_HASH_LEN];
906 0 : const uint8_t *current_salt;
907 0 : const uint8_t *old_nt_pw_salted_md5_hash;
908 :
909 0 : current_salt = &pw_history[i*PW_HISTORY_ENTRY_LEN];
910 0 : old_nt_pw_salted_md5_hash = current_salt + PW_HISTORY_SALT_LEN;
911 :
912 0 : if (all_zero(old_nt_pw_salted_md5_hash, SALTED_MD5_HASH_LEN)) {
913 : /* Ignore zero valued entries. */
914 0 : continue;
915 : }
916 :
917 0 : if (all_zero(current_salt, PW_HISTORY_SALT_LEN)) {
918 : /*
919 : * New format: zero salt and then plain nt hash.
920 : * Directly compare the hashes.
921 : */
922 0 : if (mem_equal_const_time(nt_pw, old_nt_pw_salted_md5_hash,
923 : SALTED_MD5_HASH_LEN))
924 : {
925 0 : return true;
926 : }
927 : } else {
928 0 : gnutls_hash_hd_t hash_hnd = NULL;
929 0 : int rc;
930 :
931 : /*
932 : * Old format: md5sum of salted nt hash.
933 : * Create salted version of new pw to compare.
934 : */
935 0 : rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_MD5);
936 0 : if (rc < 0) {
937 0 : return false;
938 : }
939 :
940 0 : rc = gnutls_hash(hash_hnd, current_salt, 16);
941 0 : if (rc < 0) {
942 0 : gnutls_hash_deinit(hash_hnd, NULL);
943 0 : return false;
944 : }
945 0 : rc = gnutls_hash(hash_hnd, nt_pw, 16);
946 0 : if (rc < 0) {
947 0 : gnutls_hash_deinit(hash_hnd, NULL);
948 0 : return false;
949 : }
950 0 : gnutls_hash_deinit(hash_hnd, new_nt_pw_salted_md5_hash);
951 :
952 0 : if (mem_equal_const_time(new_nt_pw_salted_md5_hash,
953 : old_nt_pw_salted_md5_hash,
954 : SALTED_MD5_HASH_LEN)) {
955 0 : return true;
956 : }
957 : }
958 : }
959 0 : return false;
960 : }
961 :
962 : /***********************************************************
963 : This routine takes the given password and checks it against
964 : the password history. Returns True if this password has been
965 : found in the history list.
966 : ************************************************************/
967 :
968 70 : static bool check_passwd_history(struct samu *sampass, const char *plaintext)
969 : {
970 0 : uchar new_nt_p16[NT_HASH_LEN];
971 0 : const uint8_t *nt_pw;
972 0 : const uint8_t *pwhistory;
973 0 : uint32_t pwHisLen, curr_pwHisLen;
974 :
975 70 : pdb_get_account_policy(PDB_POLICY_PASSWORD_HISTORY, &pwHisLen);
976 70 : if (pwHisLen == 0) {
977 70 : return False;
978 : }
979 :
980 0 : pwhistory = pdb_get_pw_history(sampass, &curr_pwHisLen);
981 0 : if (!pwhistory || curr_pwHisLen == 0) {
982 0 : return False;
983 : }
984 :
985 : /* Only examine the minimum of the current history len and
986 : the stored history len. Avoids race conditions. */
987 0 : pwHisLen = MIN(pwHisLen,curr_pwHisLen);
988 :
989 0 : nt_pw = pdb_get_nt_passwd(sampass);
990 :
991 0 : E_md4hash(plaintext, new_nt_p16);
992 :
993 0 : if (mem_equal_const_time(nt_pw, new_nt_p16, NT_HASH_LEN)) {
994 0 : DEBUG(10,("check_passwd_history: proposed new password for user %s is the same as the current password !\n",
995 : pdb_get_username(sampass) ));
996 0 : return True;
997 : }
998 :
999 0 : if (password_in_history(new_nt_p16, pwHisLen, pwhistory)) {
1000 0 : DEBUG(1,("check_passwd_history: proposed new password for "
1001 : "user %s found in history list !\n",
1002 : pdb_get_username(sampass) ));
1003 0 : return true;
1004 : }
1005 0 : return false;
1006 : }
1007 :
1008 : /***********************************************************
1009 : ************************************************************/
1010 :
1011 70 : NTSTATUS check_password_complexity(const char *username,
1012 : const char *fullname,
1013 : const char *password,
1014 : enum samPwdChangeReason *samr_reject_reason)
1015 : {
1016 70 : TALLOC_CTX *tosctx = talloc_tos();
1017 0 : const struct loadparm_substitution *lp_sub =
1018 70 : loadparm_s3_global_substitution();
1019 0 : int check_ret;
1020 0 : char *cmd;
1021 :
1022 : /* Use external script to check password complexity */
1023 70 : if ((lp_check_password_script(tosctx, lp_sub) == NULL)
1024 70 : || (*(lp_check_password_script(tosctx, lp_sub)) == '\0')){
1025 70 : return NT_STATUS_OK;
1026 : }
1027 :
1028 0 : cmd = talloc_string_sub(tosctx, lp_check_password_script(tosctx, lp_sub), "%u",
1029 : username);
1030 0 : if (!cmd) {
1031 0 : return NT_STATUS_PASSWORD_RESTRICTION;
1032 : }
1033 :
1034 0 : check_ret = setenv("SAMBA_CPS_ACCOUNT_NAME", username, 1);
1035 0 : if (check_ret != 0) {
1036 0 : return map_nt_error_from_unix_common(errno);
1037 : }
1038 0 : unsetenv("SAMBA_CPS_USER_PRINCIPAL_NAME");
1039 0 : if (fullname != NULL) {
1040 0 : check_ret = setenv("SAMBA_CPS_FULL_NAME", fullname, 1);
1041 : } else {
1042 0 : unsetenv("SAMBA_CPS_FULL_NAME");
1043 : }
1044 0 : if (check_ret != 0) {
1045 0 : return map_nt_error_from_unix_common(errno);
1046 : }
1047 0 : check_ret = smbrunsecret(cmd, password);
1048 0 : unsetenv("SAMBA_CPS_ACCOUNT_NAME");
1049 0 : unsetenv("SAMBA_CPS_USER_PRINCIPAL_NAME");
1050 0 : unsetenv("SAMBA_CPS_FULL_NAME");
1051 0 : DEBUG(5,("check_password_complexity: check password script (%s) "
1052 : "returned [%d]\n", cmd, check_ret));
1053 0 : TALLOC_FREE(cmd);
1054 :
1055 0 : if (check_ret != 0) {
1056 0 : DEBUG(1,("check_password_complexity: "
1057 : "check password script said new password is not good "
1058 : "enough!\n"));
1059 0 : if (samr_reject_reason) {
1060 0 : *samr_reject_reason = SAM_PWD_CHANGE_NOT_COMPLEX;
1061 : }
1062 0 : return NT_STATUS_PASSWORD_RESTRICTION;
1063 : }
1064 :
1065 0 : return NT_STATUS_OK;
1066 : }
1067 :
1068 : /***********************************************************
1069 : Code to change the oem password. Changes both the lanman
1070 : and NT hashes. Old_passwd is almost always NULL.
1071 : NOTE this function is designed to be called as root. Check the old password
1072 : is correct before calling. JRA.
1073 : ************************************************************/
1074 :
1075 74 : NTSTATUS change_oem_password(struct samu *hnd, const char *rhost,
1076 : char *old_passwd, char *new_passwd,
1077 : bool as_root,
1078 : enum samPwdChangeReason *samr_reject_reason)
1079 : {
1080 0 : uint32_t min_len;
1081 0 : uint32_t refuse;
1082 74 : TALLOC_CTX *tosctx = talloc_tos();
1083 74 : struct passwd *pass = NULL;
1084 74 : const char *username = pdb_get_username(hnd);
1085 74 : const char *fullname = pdb_get_fullname(hnd);
1086 74 : time_t can_change_time = pdb_get_pass_can_change_time(hnd);
1087 0 : NTSTATUS status;
1088 :
1089 74 : if (samr_reject_reason) {
1090 52 : *samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
1091 : }
1092 :
1093 : /* check to see if the secdesc has previously been set to disallow */
1094 74 : if (!pdb_get_pass_can_change(hnd)) {
1095 0 : DEBUG(1, ("user %s does not have permissions to change password\n", username));
1096 0 : if (samr_reject_reason) {
1097 0 : *samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
1098 : }
1099 0 : return NT_STATUS_ACCOUNT_RESTRICTION;
1100 : }
1101 :
1102 : /* check to see if it is a Machine account and if the policy
1103 : * denies machines to change the password. *
1104 : * Should we deny also SRVTRUST and/or DOMSTRUST ? .SSS. */
1105 74 : if (pdb_get_acct_ctrl(hnd) & ACB_WSTRUST) {
1106 0 : if (pdb_get_account_policy(PDB_POLICY_REFUSE_MACHINE_PW_CHANGE, &refuse) && refuse) {
1107 0 : DEBUG(1, ("Machine %s cannot change password now, "
1108 : "denied by Refuse Machine Password Change policy\n",
1109 : username));
1110 0 : if (samr_reject_reason) {
1111 0 : *samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
1112 : }
1113 0 : return NT_STATUS_ACCOUNT_RESTRICTION;
1114 : }
1115 : }
1116 :
1117 : /* removed calculation here, because passdb now calculates
1118 : based on policy. jmcd */
1119 74 : if ((can_change_time != 0) && (time(NULL) < can_change_time)) {
1120 0 : DEBUG(1, ("user %s cannot change password now, must "
1121 : "wait until %s\n", username,
1122 : http_timestring(tosctx, can_change_time)));
1123 0 : if (samr_reject_reason) {
1124 0 : *samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
1125 : }
1126 0 : return NT_STATUS_ACCOUNT_RESTRICTION;
1127 : }
1128 :
1129 74 : if (pdb_get_account_policy(PDB_POLICY_MIN_PASSWORD_LEN, &min_len) && (str_charnum(new_passwd) < min_len)) {
1130 4 : DBG_WARNING("user %s cannot change password - "
1131 : "password too short\n"
1132 : " account policy min password len = %"PRIu32"\n",
1133 : username,
1134 : min_len);
1135 4 : if (samr_reject_reason) {
1136 4 : *samr_reject_reason = SAM_PWD_CHANGE_PASSWORD_TOO_SHORT;
1137 : }
1138 4 : return NT_STATUS_PASSWORD_RESTRICTION;
1139 : /* return NT_STATUS_PWD_TOO_SHORT; */
1140 : }
1141 :
1142 70 : if (check_passwd_history(hnd,new_passwd)) {
1143 0 : if (samr_reject_reason) {
1144 0 : *samr_reject_reason = SAM_PWD_CHANGE_PWD_IN_HISTORY;
1145 : }
1146 0 : return NT_STATUS_PASSWORD_RESTRICTION;
1147 : }
1148 :
1149 70 : pass = Get_Pwnam_alloc(tosctx, username);
1150 70 : if (!pass) {
1151 0 : DEBUG(1, ("change_oem_password: Username %s does not exist in system !?!\n", username));
1152 0 : return NT_STATUS_ACCESS_DENIED;
1153 : }
1154 :
1155 70 : status = check_password_complexity(username,
1156 : fullname,
1157 : new_passwd,
1158 : samr_reject_reason);
1159 70 : if (!NT_STATUS_IS_OK(status)) {
1160 0 : TALLOC_FREE(pass);
1161 0 : return status;
1162 : }
1163 :
1164 : /*
1165 : * If unix password sync was requested, attempt to change
1166 : * the /etc/passwd database first. Return failure if this cannot
1167 : * be done.
1168 : *
1169 : * This occurs before the oem change, because we don't want to
1170 : * update it if chgpasswd failed.
1171 : *
1172 : * Conditional on lp_unix_password_sync() because we don't want
1173 : * to touch the unix db unless we have admin permission.
1174 : */
1175 :
1176 70 : if(lp_unix_password_sync() &&
1177 0 : !chgpasswd(username, rhost, pass, old_passwd, new_passwd,
1178 : as_root)) {
1179 0 : TALLOC_FREE(pass);
1180 0 : return NT_STATUS_ACCESS_DENIED;
1181 : }
1182 :
1183 70 : TALLOC_FREE(pass);
1184 :
1185 70 : if (!pdb_set_plaintext_passwd (hnd, new_passwd)) {
1186 0 : return NT_STATUS_ACCESS_DENIED;
1187 : }
1188 :
1189 : /* Now write it into the file. */
1190 70 : return pdb_update_sam_account (hnd);
1191 : }
1192 :
1193 : /***********************************************************
1194 : Code to check and change the OEM hashed password.
1195 : ************************************************************/
1196 :
1197 240 : NTSTATUS pass_oem_change(char *user, const char *rhost,
1198 : uchar password_encrypted_with_lm_hash[516],
1199 : const uchar old_lm_hash_encrypted[16],
1200 : uchar password_encrypted_with_nt_hash[516],
1201 : const uchar old_nt_hash_encrypted[16],
1202 : enum samPwdChangeReason *reject_reason)
1203 : {
1204 240 : char *new_passwd = NULL;
1205 240 : struct samu *sampass = NULL;
1206 0 : NTSTATUS nt_status;
1207 240 : bool ret = false;
1208 240 : bool updated_badpw = false;
1209 0 : NTSTATUS update_login_attempts_status;
1210 240 : char *mutex_name_by_user = NULL;
1211 240 : struct named_mutex *mtx = NULL;
1212 :
1213 240 : if (!(sampass = samu_new(NULL))) {
1214 0 : return NT_STATUS_NO_MEMORY;
1215 : }
1216 :
1217 240 : become_root();
1218 240 : ret = pdb_getsampwnam(sampass, user);
1219 240 : unbecome_root();
1220 :
1221 240 : if (ret == false) {
1222 56 : DEBUG(0,("pass_oem_change: getsmbpwnam returned NULL\n"));
1223 56 : nt_status = NT_STATUS_NO_SUCH_USER;
1224 56 : goto done;
1225 : }
1226 :
1227 : /* Quit if the account was locked out. */
1228 184 : if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
1229 4 : DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", user));
1230 4 : nt_status = NT_STATUS_ACCOUNT_LOCKED_OUT;
1231 4 : goto done;
1232 : }
1233 :
1234 180 : nt_status = check_oem_password(user,
1235 : password_encrypted_with_lm_hash,
1236 : old_lm_hash_encrypted,
1237 : password_encrypted_with_nt_hash,
1238 : old_nt_hash_encrypted,
1239 : sampass,
1240 : &new_passwd);
1241 :
1242 : /*
1243 : * We must re-load the sam account information under a mutex
1244 : * lock to ensure we don't miss any concurrent account lockout
1245 : * changes.
1246 : */
1247 :
1248 : /* Clear out old sampass info. */
1249 180 : TALLOC_FREE(sampass);
1250 :
1251 180 : sampass = samu_new(NULL);
1252 180 : if (sampass == NULL) {
1253 0 : return NT_STATUS_NO_MEMORY;
1254 : }
1255 :
1256 180 : mutex_name_by_user = talloc_asprintf(NULL,
1257 : "check_sam_security_mutex_%s",
1258 : user);
1259 180 : if (mutex_name_by_user == NULL) {
1260 0 : nt_status = NT_STATUS_NO_MEMORY;
1261 0 : goto done;
1262 : }
1263 :
1264 : /* Grab the named mutex under root with 30 second timeout. */
1265 180 : become_root();
1266 180 : mtx = grab_named_mutex(NULL, mutex_name_by_user, 30);
1267 180 : if (mtx != NULL) {
1268 : /* Re-load the account information if we got the mutex. */
1269 180 : ret = pdb_getsampwnam(sampass, user);
1270 : }
1271 180 : unbecome_root();
1272 :
1273 : /* Everything from here on until mtx is freed is done under the mutex.*/
1274 :
1275 180 : if (mtx == NULL) {
1276 0 : DBG_ERR("Acquisition of mutex %s failed "
1277 : "for user %s\n",
1278 : mutex_name_by_user,
1279 : user);
1280 0 : nt_status = NT_STATUS_INTERNAL_ERROR;
1281 0 : goto done;
1282 : }
1283 :
1284 180 : if (!ret) {
1285 : /*
1286 : * Re-load of account failed. This could only happen if the
1287 : * user was deleted in the meantime.
1288 : */
1289 0 : DBG_NOTICE("reload of user '%s' in passdb failed.\n",
1290 : user);
1291 0 : nt_status = NT_STATUS_NO_SUCH_USER;
1292 0 : goto done;
1293 : }
1294 :
1295 : /*
1296 : * Check if the account is now locked out - now under the mutex.
1297 : * This can happen if the server is under
1298 : * a password guess attack and the ACB_AUTOLOCK is set by
1299 : * another process.
1300 : */
1301 180 : if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
1302 0 : DBG_NOTICE("Account for user %s was locked out.\n", user);
1303 0 : nt_status = NT_STATUS_ACCOUNT_LOCKED_OUT;
1304 0 : goto done;
1305 : }
1306 :
1307 : /*
1308 : * Notify passdb backend of login success/failure. If not
1309 : * NT_STATUS_OK the backend doesn't like the login
1310 : */
1311 180 : update_login_attempts_status = pdb_update_login_attempts(sampass,
1312 180 : NT_STATUS_IS_OK(nt_status));
1313 :
1314 180 : if (!NT_STATUS_IS_OK(nt_status)) {
1315 116 : bool increment_bad_pw_count = false;
1316 :
1317 116 : if (NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) &&
1318 114 : (pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
1319 114 : NT_STATUS_IS_OK(update_login_attempts_status))
1320 : {
1321 114 : increment_bad_pw_count = true;
1322 : }
1323 :
1324 116 : if (increment_bad_pw_count) {
1325 114 : pdb_increment_bad_password_count(sampass);
1326 114 : updated_badpw = true;
1327 : } else {
1328 2 : pdb_update_bad_password_count(sampass,
1329 : &updated_badpw);
1330 : }
1331 : } else {
1332 :
1333 128 : if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
1334 64 : (pdb_get_bad_password_count(sampass) > 0)){
1335 0 : pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
1336 0 : pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
1337 0 : updated_badpw = true;
1338 : }
1339 : }
1340 :
1341 180 : if (updated_badpw) {
1342 0 : NTSTATUS update_status;
1343 114 : become_root();
1344 114 : update_status = pdb_update_sam_account(sampass);
1345 114 : unbecome_root();
1346 :
1347 114 : if (!NT_STATUS_IS_OK(update_status)) {
1348 0 : DEBUG(1, ("Failed to modify entry: %s\n",
1349 : nt_errstr(update_status)));
1350 : }
1351 : }
1352 :
1353 180 : if (!NT_STATUS_IS_OK(nt_status)) {
1354 116 : goto done;
1355 : }
1356 :
1357 : /* We've already checked the old password here.... */
1358 64 : become_root();
1359 64 : nt_status = change_oem_password(sampass, rhost, NULL, new_passwd,
1360 : True, reject_reason);
1361 64 : unbecome_root();
1362 :
1363 64 : BURN_STR(new_passwd);
1364 :
1365 0 : done:
1366 240 : TALLOC_FREE(sampass);
1367 240 : TALLOC_FREE(mutex_name_by_user);
1368 240 : TALLOC_FREE(mtx);
1369 :
1370 240 : return nt_status;
1371 : }
1372 :
1373 10 : NTSTATUS samr_set_password_aes(TALLOC_CTX *mem_ctx,
1374 : const DATA_BLOB *cdk,
1375 : struct samr_EncryptedPasswordAES *pwbuf,
1376 : char **new_password_str)
1377 : {
1378 10 : DATA_BLOB pw_data = data_blob_null;
1379 10 : DATA_BLOB new_password = data_blob_null;
1380 0 : const DATA_BLOB ciphertext =
1381 10 : data_blob_const(pwbuf->cipher, pwbuf->cipher_len);
1382 10 : DATA_BLOB iv = data_blob_const(pwbuf->salt, sizeof(pwbuf->salt));
1383 0 : NTSTATUS status;
1384 0 : bool ok;
1385 :
1386 10 : *new_password_str = NULL;
1387 :
1388 10 : status = samba_gnutls_aead_aes_256_cbc_hmac_sha512_decrypt(
1389 : mem_ctx,
1390 : &ciphertext,
1391 : cdk,
1392 : &samr_aes256_enc_key_salt,
1393 : &samr_aes256_mac_key_salt,
1394 : &iv,
1395 10 : pwbuf->auth_data,
1396 : &pw_data);
1397 10 : if (!NT_STATUS_IS_OK(status)) {
1398 0 : return NT_STATUS_WRONG_PASSWORD;
1399 : }
1400 :
1401 10 : ok = decode_pwd_string_from_buffer514(mem_ctx,
1402 10 : pw_data.data,
1403 : CH_UTF16,
1404 : &new_password);
1405 10 : TALLOC_FREE(pw_data.data);
1406 10 : if (!ok) {
1407 0 : DBG_NOTICE("samr: failed to decode password buffer\n");
1408 0 : return NT_STATUS_WRONG_PASSWORD;
1409 : }
1410 :
1411 20 : *new_password_str = talloc_strndup(mem_ctx,
1412 10 : (char *)new_password.data,
1413 : new_password.length);
1414 10 : TALLOC_FREE(new_password.data);
1415 10 : if (*new_password_str == NULL) {
1416 0 : return NT_STATUS_NO_MEMORY;
1417 : }
1418 10 : talloc_keep_secret(*new_password_str);
1419 :
1420 10 : return NT_STATUS_OK;
1421 : }
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