2 Unix SMB/CIFS implementation.
3 Samba utility functions
4 Copyright (C) Andrew Tridgell 1992-1998
5 Copyright (C) Andrew Bartlett 2001-2004
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 2 of the License, or
10 (at your option) any later version.
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.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
22 /* These comments regard the code to change the user's unix password: */
24 /* fork a child process to exec passwd and write to its
25 * tty to change a users password. This is running as the
26 * user who is attempting to change the password.
30 * This code was copied/borrowed and stolen from various sources.
31 * The primary source was the poppasswd.c from the authors of POPMail. This software
32 * was included as a client to change passwords using the 'passwd' program
33 * on the remote machine.
35 * This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson
36 * (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences
37 * and rights to modify, distribute or incorporate this change to the CAP suite or
38 * using it for any other reason are granted, so long as this disclaimer is left intact.
42 This code was hacked considerably for inclusion in Samba, primarily
43 by Andrew.Tridgell@anu.edu.au. The biggest change was the addition
44 of the "password chat" option, which allows the easy runtime
45 specification of the expected sequence of events to change a
51 extern struct passdb_ops pdb_ops;
53 static NTSTATUS check_oem_password(const char *user,
54 uchar password_encrypted_with_lm_hash[516],
55 const uchar old_lm_hash_encrypted[16],
56 uchar password_encrypted_with_nt_hash[516],
57 const uchar old_nt_hash_encrypted[16],
58 struct samu **hnd, char *new_passwd,
61 #if ALLOW_CHANGE_PASSWORD
63 static int findpty(char **slave)
70 #if defined(HAVE_GRANTPT)
71 /* Try to open /dev/ptmx. If that fails, fall through to old method. */
72 if ((master = sys_open("/dev/ptmx", O_RDWR, 0)) >= 0)
76 *slave = (char *)ptsname(master);
80 ("findpty: Unable to create master/slave pty pair.\n"));
81 /* Stop fd leak on error. */
88 ("findpty: Allocated slave pty %s\n", *slave));
92 #endif /* HAVE_GRANTPT */
94 fstrcpy(line, "/dev/ptyXX");
96 dirp = sys_opendir("/dev");
99 while ((dpname = readdirname(dirp)) != NULL)
101 if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5)
104 ("pty: try to open %s, line was %s\n", dpname,
108 if ((master = sys_open(line, O_RDWR, 0)) >= 0)
110 DEBUG(3, ("pty: opened %s\n", line));
122 static int dochild(int master, const char *slavedev, const struct passwd *pass,
123 const char *passwordprogram, BOOL as_root)
126 struct termios stermios;
133 ("dochild: user doesn't exist in the UNIX password database.\n"));
140 gain_root_privilege();
142 /* Start new session - gets rid of controlling terminal. */
146 ("Weirdness, couldn't let go of controlling terminal\n"));
150 /* Open slave pty and acquire as new controlling terminal. */
151 if ((slave = sys_open(slavedev, O_RDWR, 0)) < 0)
153 DEBUG(3, ("More weirdness, could not open %s\n", slavedev));
156 #if defined(I_PUSH) && defined(I_FIND)
157 if (ioctl(slave, I_FIND, "ptem") == 0) {
158 ioctl(slave, I_PUSH, "ptem");
160 if (ioctl(slave, I_FIND, "ldterm") == 0) {
161 ioctl(slave, I_PUSH, "ldterm");
163 #elif defined(TIOCSCTTY)
164 if (ioctl(slave, TIOCSCTTY, 0) < 0)
166 DEBUG(3, ("Error in ioctl call for slave pty\n"));
174 /* Make slave stdin/out/err of child. */
176 if (sys_dup2(slave, STDIN_FILENO) != STDIN_FILENO)
178 DEBUG(3, ("Could not re-direct stdin\n"));
181 if (sys_dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
183 DEBUG(3, ("Could not re-direct stdout\n"));
186 if (sys_dup2(slave, STDERR_FILENO) != STDERR_FILENO)
188 DEBUG(3, ("Could not re-direct stderr\n"));
194 /* Set proper terminal attributes - no echo, canonical input processing,
195 no map NL to CR/NL on output. */
197 if (tcgetattr(0, &stermios) < 0)
200 ("could not read default terminal attributes on pty\n"));
203 stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
204 stermios.c_lflag |= ICANON;
206 stermios.c_oflag &= ~(ONLCR);
208 if (tcsetattr(0, TCSANOW, &stermios) < 0)
210 DEBUG(3, ("could not set attributes of pty\n"));
214 /* make us completely into the right uid */
217 become_user_permanently(uid, gid);
221 ("Invoking '%s' as password change program.\n",
224 /* execl() password-change application */
225 if (execl("/bin/sh", "sh", "-c", passwordprogram, NULL) < 0)
227 DEBUG(3, ("Bad status returned from %s\n", passwordprogram));
233 static int expect(int master, char *issue, char *expected)
236 int attempts, timeout, nread, len;
239 for (attempts = 0; attempts < 2; attempts++) {
240 if (!strequal(issue, ".")) {
241 if (lp_passwd_chat_debug())
242 DEBUG(100, ("expect: sending [%s]\n", issue));
244 if ((len = write(master, issue, strlen(issue))) != strlen(issue)) {
245 DEBUG(2,("expect: (short) write returned %d\n", len ));
250 if (strequal(expected, "."))
253 /* Initial timeout. */
254 timeout = lp_passwd_chat_timeout() * 1000;
258 while ((len = read_socket_with_timeout(master, buffer + nread, 1,
259 sizeof(buffer) - nread - 1,
265 /* Eat leading/trailing whitespace before match. */
267 pstrcpy( str, buffer);
268 trim_char( str, ' ', ' ');
270 if ((match = unix_wild_match(expected, str)) == True) {
271 /* Now data has started to return, lower timeout. */
272 timeout = lp_passwd_chat_timeout() * 100;
277 if (lp_passwd_chat_debug())
278 DEBUG(100, ("expect: expected [%s] received [%s] match %s\n",
279 expected, buffer, match ? "yes" : "no" ));
285 DEBUG(2, ("expect: %s\n", strerror(errno)));
290 DEBUG(10,("expect: returning %s\n", match ? "True" : "False" ));
294 static void pwd_sub(char *buf)
296 all_string_sub(buf, "\\n", "\n", 0);
297 all_string_sub(buf, "\\r", "\r", 0);
298 all_string_sub(buf, "\\s", " ", 0);
299 all_string_sub(buf, "\\t", "\t", 0);
302 static int talktochild(int master, const char *seq)
305 fstring issue, expected;
309 while (next_token(&seq, expected, NULL, sizeof(expected)))
314 if (!expect(master, issue, expected))
316 DEBUG(3, ("Response %d incorrect\n", count));
320 if (!next_token(&seq, issue, NULL, sizeof(issue)))
325 if (!strequal(issue, ".")) {
326 /* we have one final issue to send */
327 fstrcpy(expected, ".");
328 if (!expect(master, issue, expected))
335 static BOOL chat_with_program(char *passwordprogram, const struct passwd *pass,
336 char *chatsequence, BOOL as_root)
345 DEBUG(0, ("chat_with_program: user doesn't exist in the UNIX password database.\n"));
349 /* allocate a pseudo-terminal device */
350 if ((master = findpty(&slavedev)) < 0) {
351 DEBUG(3, ("chat_with_program: Cannot Allocate pty for password change: %s\n", pass->pw_name));
356 * We need to temporarily stop CatchChild from eating
357 * SIGCLD signals as it also eats the exit status code. JRA.
360 CatchChildLeaveStatus();
362 if ((pid = sys_fork()) < 0) {
363 DEBUG(3, ("chat_with_program: Cannot fork() child for password change: %s\n", pass->pw_name));
369 /* we now have a pty */
370 if (pid > 0) { /* This is the parent process */
371 if ((chstat = talktochild(master, chatsequence)) == False) {
372 DEBUG(3, ("chat_with_program: Child failed to change password: %s\n", pass->pw_name));
373 kill(pid, SIGKILL); /* be sure to end this process */
376 while ((wpid = sys_waitpid(pid, &wstat, 0)) < 0) {
377 if (errno == EINTR) {
385 DEBUG(3, ("chat_with_program: The process is no longer waiting!\n\n"));
392 * Go back to ignoring children.
399 DEBUG(3, ("chat_with_program: We were waiting for the wrong process ID\n"));
402 if (WIFEXITED(wstat) && (WEXITSTATUS(wstat) != 0)) {
403 DEBUG(3, ("chat_with_program: The process exited with status %d \
404 while we were waiting\n", WEXITSTATUS(wstat)));
407 #if defined(WIFSIGNALLED) && defined(WTERMSIG)
408 else if (WIFSIGNALLED(wstat)) {
409 DEBUG(3, ("chat_with_program: The process was killed by signal %d \
410 while we were waiting\n", WTERMSIG(wstat)));
418 * Lose any oplock capabilities.
420 oplock_set_capability(False, False);
422 /* make sure it doesn't freeze */
428 DEBUG(3, ("chat_with_program: Dochild for user %s (uid=%d,gid=%d) (as_root = %s)\n", pass->pw_name,
429 (int)getuid(), (int)getgid(), BOOLSTR(as_root) ));
430 chstat = dochild(master, slavedev, pass, passwordprogram, as_root);
436 * The child should never return from dochild() ....
439 DEBUG(0, ("chat_with_program: Error: dochild() returned %d\n", chstat));
444 DEBUG(3, ("chat_with_program: Password change %ssuccessful for user %s\n",
445 (chstat ? "" : "un"), pass->pw_name));
449 BOOL chgpasswd(const char *name, const struct passwd *pass,
450 const char *oldpass, const char *newpass, BOOL as_root)
452 pstring passwordprogram;
453 pstring chatsequence;
461 DEBUG(3, ("chgpasswd: Password change (as_root=%s) for user: %s\n", BOOLSTR(as_root), name));
463 #ifdef DEBUG_PASSWORD
464 DEBUG(100, ("chgpasswd: Passwords: old=%s new=%s\n", oldpass, newpass));
467 /* Take the passed information and test it for minimum criteria */
469 /* Password is same as old password */
470 if (strcmp(oldpass, newpass) == 0) {
471 /* don't allow same password */
472 DEBUG(2, ("chgpasswd: Password Change: %s, New password is same as old\n", name)); /* log the attempt */
473 return (False); /* inform the user */
477 * Check the old and new passwords don't contain any control
481 len = strlen(oldpass);
482 for (i = 0; i < len; i++) {
483 if (iscntrl((int)oldpass[i])) {
484 DEBUG(0, ("chgpasswd: oldpass contains control characters (disallowed).\n"));
489 len = strlen(newpass);
490 for (i = 0; i < len; i++) {
491 if (iscntrl((int)newpass[i])) {
492 DEBUG(0, ("chgpasswd: newpass contains control characters (disallowed).\n"));
498 if (lp_pam_password_change()) {
505 ret = smb_pam_passchange(pass->pw_name, oldpass, newpass);
507 ret = smb_pam_passchange(name, oldpass, newpass);
517 /* A non-PAM password change just doen't make sense without a valid local user */
520 DEBUG(0, ("chgpasswd: user %s doesn't exist in the UNIX password database.\n", name));
524 pstrcpy(passwordprogram, lp_passwd_program());
525 pstrcpy(chatsequence, lp_passwd_chat());
527 if (!*chatsequence) {
528 DEBUG(2, ("chgpasswd: Null chat sequence - no password changing\n"));
532 if (!*passwordprogram) {
533 DEBUG(2, ("chgpasswd: Null password program - no password changing\n"));
538 /* The password program *must* contain the user name to work. Fail if not. */
539 if (strstr_m(passwordprogram, "%u") == NULL) {
540 DEBUG(0,("chgpasswd: Running as root the 'passwd program' parameter *MUST* contain \
541 the string %%u, and the given string %s does not.\n", passwordprogram ));
546 pstring_sub(passwordprogram, "%u", name);
547 /* note that we do NOT substitute the %o and %n in the password program
548 as this would open up a security hole where the user could use
549 a new password containing shell escape characters */
551 pstring_sub(chatsequence, "%u", name);
552 all_string_sub(chatsequence, "%o", oldpass, sizeof(pstring));
553 all_string_sub(chatsequence, "%n", newpass, sizeof(pstring));
554 return (chat_with_program
555 (passwordprogram, pass, chatsequence, as_root));
558 #else /* ALLOW_CHANGE_PASSWORD */
560 BOOL chgpasswd(const char *name, const struct passwd *pass,
561 const char *oldpass, const char *newpass, BOOL as_root)
563 DEBUG(0, ("chgpasswd: Unix Password changing not compiled in (user=%s)\n", name));
566 #endif /* ALLOW_CHANGE_PASSWORD */
568 /***********************************************************
569 Code to check the lanman hashed password.
570 ************************************************************/
572 BOOL check_lanman_password(char *user, uchar * pass1,
573 uchar * pass2, struct samu **hnd)
575 uchar unenc_new_pw[16];
576 uchar unenc_old_pw[16];
577 struct samu *sampass = NULL;
579 const uint8 *lanman_pw;
583 ret = pdb_getsampwnam(sampass, user);
587 DEBUG(0,("check_lanman_password: getsampwnam returned NULL\n"));
588 TALLOC_FREE(sampass);
592 acct_ctrl = pdb_get_acct_ctrl (sampass);
593 lanman_pw = pdb_get_lanman_passwd (sampass);
595 if (acct_ctrl & ACB_DISABLED) {
596 DEBUG(0,("check_lanman_password: account %s disabled.\n", user));
597 TALLOC_FREE(sampass);
601 if (lanman_pw == NULL) {
602 if (acct_ctrl & ACB_PWNOTREQ) {
603 /* this saves the pointer for the caller */
607 DEBUG(0, ("check_lanman_password: no lanman password !\n"));
608 TALLOC_FREE(sampass);
613 /* Get the new lanman hash. */
614 D_P16(lanman_pw, pass2, unenc_new_pw);
616 /* Use this to get the old lanman hash. */
617 D_P16(unenc_new_pw, pass1, unenc_old_pw);
619 /* Check that the two old passwords match. */
620 if (memcmp(lanman_pw, unenc_old_pw, 16)) {
621 DEBUG(0,("check_lanman_password: old password doesn't match.\n"));
622 TALLOC_FREE(sampass);
626 /* this saves the pointer for the caller */
631 /***********************************************************
632 Code to change the lanman hashed password.
633 It nulls out the NT hashed password as it will
635 NOTE this function is designed to be called as root. Check the old password
636 is correct before calling. JRA.
637 ************************************************************/
639 BOOL change_lanman_password(struct samu *sampass, uchar *pass2)
641 static uchar null_pw[16];
642 uchar unenc_new_pw[16];
647 if (sampass == NULL) {
648 DEBUG(0,("change_lanman_password: no smb password entry.\n"));
652 acct_ctrl = pdb_get_acct_ctrl(sampass);
653 pwd = pdb_get_lanman_passwd(sampass);
655 if (acct_ctrl & ACB_DISABLED) {
656 DEBUG(0,("change_lanman_password: account %s disabled.\n",
657 pdb_get_username(sampass)));
662 if (acct_ctrl & ACB_PWNOTREQ) {
664 memset(no_pw, '\0', 14);
665 E_P16(no_pw, null_pw);
667 /* Get the new lanman hash. */
668 D_P16(null_pw, pass2, unenc_new_pw);
670 DEBUG(0,("change_lanman_password: no lanman password !\n"));
674 /* Get the new lanman hash. */
675 D_P16(pwd, pass2, unenc_new_pw);
678 if (!pdb_set_lanman_passwd(sampass, unenc_new_pw, PDB_CHANGED)) {
682 if (!pdb_set_nt_passwd (sampass, NULL, PDB_CHANGED)) {
683 return False; /* We lose the NT hash. Sorry. */
686 if (!pdb_set_pass_changed_now (sampass)) {
687 TALLOC_FREE(sampass);
688 /* Not quite sure what this one qualifies as, but this will do */
692 /* Now flush the sam_passwd struct to persistent storage */
693 ret = NT_STATUS_IS_OK(pdb_update_sam_account (sampass));
698 /***********************************************************
699 Code to check and change the OEM hashed password.
700 ************************************************************/
702 NTSTATUS pass_oem_change(char *user,
703 uchar password_encrypted_with_lm_hash[516],
704 const uchar old_lm_hash_encrypted[16],
705 uchar password_encrypted_with_nt_hash[516],
706 const uchar old_nt_hash_encrypted[16],
707 uint32 *reject_reason)
710 struct samu *sampass = NULL;
711 NTSTATUS nt_status = check_oem_password(user, password_encrypted_with_lm_hash,
712 old_lm_hash_encrypted,
713 password_encrypted_with_nt_hash,
714 old_nt_hash_encrypted,
715 &sampass, new_passwd, sizeof(new_passwd));
717 if (!NT_STATUS_IS_OK(nt_status))
720 /* We've already checked the old password here.... */
722 nt_status = change_oem_password(sampass, NULL, new_passwd, True, reject_reason);
725 memset(new_passwd, 0, sizeof(new_passwd));
727 TALLOC_FREE(sampass);
732 /***********************************************************
733 Decrypt and verify a user password change.
735 The 516 byte long buffers are encrypted with the old NT and
736 old LM passwords, and if the NT passwords are present, both
737 buffers contain a unicode string.
739 After decrypting the buffers, check the password is correct by
740 matching the old hashed passwords with the passwords in the passdb.
742 ************************************************************/
744 static NTSTATUS check_oem_password(const char *user,
745 uchar password_encrypted_with_lm_hash[516],
746 const uchar old_lm_hash_encrypted[16],
747 uchar password_encrypted_with_nt_hash[516],
748 const uchar old_nt_hash_encrypted[16],
749 struct samu **hnd, char *new_passwd,
752 static uchar null_pw[16];
753 static uchar null_ntpw[16];
754 struct samu *sampass = NULL;
755 uint8 *password_encrypted;
756 const uint8 *encryption_key;
757 const uint8 *lanman_pw, *nt_pw;
760 uchar new_nt_hash[16];
761 uchar new_lm_hash[16];
766 BOOL nt_pass_set = (password_encrypted_with_nt_hash && old_nt_hash_encrypted);
767 BOOL lm_pass_set = (password_encrypted_with_lm_hash && old_lm_hash_encrypted);
771 if ( !(sampass = samu_new( NULL )) ) {
772 return NT_STATUS_NO_MEMORY;
776 ret = pdb_getsampwnam(sampass, user);
780 DEBUG(0, ("check_oem_password: getsmbpwnam returned NULL\n"));
781 TALLOC_FREE(sampass);
782 return NT_STATUS_NO_SUCH_USER;
785 acct_ctrl = pdb_get_acct_ctrl(sampass);
787 if (acct_ctrl & ACB_DISABLED) {
788 DEBUG(2,("check_lanman_password: account %s disabled.\n", user));
789 TALLOC_FREE(sampass);
790 return NT_STATUS_ACCOUNT_DISABLED;
793 if ((acct_ctrl & ACB_PWNOTREQ) && lp_null_passwords()) {
794 /* construct a null password (in case one is needed */
797 nt_lm_owf_gen(no_pw, null_ntpw, null_pw);
802 /* save pointers to passwords so we don't have to keep looking them up */
803 if (lp_lanman_auth()) {
804 lanman_pw = pdb_get_lanman_passwd(sampass);
808 nt_pw = pdb_get_nt_passwd(sampass);
811 if (nt_pw && nt_pass_set) {
812 /* IDEAL Case: passwords are in unicode, and we can
813 * read use the password encrypted with the NT hash
815 password_encrypted = password_encrypted_with_nt_hash;
816 encryption_key = nt_pw;
817 } else if (lanman_pw && lm_pass_set) {
818 /* password may still be in unicode, but use LM hash version */
819 password_encrypted = password_encrypted_with_lm_hash;
820 encryption_key = lanman_pw;
821 } else if (nt_pass_set) {
822 DEBUG(1, ("NT password change supplied for user %s, but we have no NT password to check it with\n",
824 TALLOC_FREE(sampass);
825 return NT_STATUS_WRONG_PASSWORD;
826 } else if (lm_pass_set) {
827 if (lp_lanman_auth()) {
828 DEBUG(1, ("LM password change supplied for user %s, but we have no LanMan password to check it with\n",
831 DEBUG(1, ("LM password change supplied for user %s, but we have disabled LanMan authentication\n",
834 TALLOC_FREE(sampass);
835 return NT_STATUS_WRONG_PASSWORD;
837 DEBUG(1, ("password change requested for user %s, but no password supplied!\n",
839 TALLOC_FREE(sampass);
840 return NT_STATUS_WRONG_PASSWORD;
844 * Decrypt the password with the key
846 SamOEMhash( password_encrypted, encryption_key, 516);
848 if ( !decode_pw_buffer(password_encrypted, new_passwd, new_passwd_size, &new_pw_len,
849 nt_pass_set ? STR_UNICODE : STR_ASCII)) {
850 TALLOC_FREE(sampass);
851 return NT_STATUS_WRONG_PASSWORD;
855 * To ensure we got the correct new password, hash it and
856 * use it as a key to test the passed old password.
860 /* NT passwords, verify the NT hash. */
862 /* Calculate the MD4 hash (NT compatible) of the password */
863 memset(new_nt_hash, '\0', 16);
864 E_md4hash(new_passwd, new_nt_hash);
868 * check the NT verifier
870 E_old_pw_hash(new_nt_hash, nt_pw, verifier);
871 if (memcmp(verifier, old_nt_hash_encrypted, 16)) {
872 DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
873 TALLOC_FREE(sampass);
874 return NT_STATUS_WRONG_PASSWORD;
877 /* We could check the LM password here, but there is
878 * little point, we already know the password is
879 * correct, and the LM password might not even be
882 /* Further, LM hash generation algorithms
883 * differ with charset, so we could
884 * incorrectly fail a perfectly valid password
886 #ifdef DEBUG_PASSWORD
888 ("check_oem_password: password %s ok\n", new_passwd));
896 * check the lm verifier
898 E_old_pw_hash(new_nt_hash, lanman_pw, verifier);
899 if (memcmp(verifier, old_lm_hash_encrypted, 16)) {
900 DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
901 TALLOC_FREE(sampass);
902 return NT_STATUS_WRONG_PASSWORD;
904 #ifdef DEBUG_PASSWORD
906 ("check_oem_password: password %s ok\n", new_passwd));
913 if (lanman_pw && lm_pass_set) {
915 E_deshash(new_passwd, new_lm_hash);
918 * check the lm verifier
920 E_old_pw_hash(new_lm_hash, lanman_pw, verifier);
921 if (memcmp(verifier, old_lm_hash_encrypted, 16)) {
922 DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
923 TALLOC_FREE(sampass);
924 return NT_STATUS_WRONG_PASSWORD;
927 #ifdef DEBUG_PASSWORD
929 ("check_oem_password: password %s ok\n", new_passwd));
935 /* should not be reached */
936 TALLOC_FREE(sampass);
937 return NT_STATUS_WRONG_PASSWORD;
940 /***********************************************************
941 This routine takes the given password and checks it against
942 the password history. Returns True if this password has been
943 found in the history list.
944 ************************************************************/
946 static BOOL check_passwd_history(struct samu *sampass, const char *plaintext)
948 uchar new_nt_p16[NT_HASH_LEN];
949 uchar zero_md5_nt_pw[SALTED_MD5_HASH_LEN];
951 const uint8 *pwhistory;
954 uint32 pwHisLen, curr_pwHisLen;
956 pdb_get_account_policy(AP_PASSWORD_HISTORY, &pwHisLen);
961 pwhistory = pdb_get_pw_history(sampass, &curr_pwHisLen);
962 if (!pwhistory || curr_pwHisLen == 0) {
966 /* Only examine the minimum of the current history len and
967 the stored history len. Avoids race conditions. */
968 pwHisLen = MIN(pwHisLen,curr_pwHisLen);
970 nt_pw = pdb_get_nt_passwd(sampass);
972 E_md4hash(plaintext, new_nt_p16);
974 if (!memcmp(nt_pw, new_nt_p16, NT_HASH_LEN)) {
975 DEBUG(10,("check_passwd_history: proposed new password for user %s is the same as the current password !\n",
976 pdb_get_username(sampass) ));
980 dump_data(100, (const char *)new_nt_p16, NT_HASH_LEN);
981 dump_data(100, (const char *)pwhistory, PW_HISTORY_ENTRY_LEN*pwHisLen);
983 memset(zero_md5_nt_pw, '\0', SALTED_MD5_HASH_LEN);
984 for (i=0; i<pwHisLen; i++) {
985 uchar new_nt_pw_salted_md5_hash[SALTED_MD5_HASH_LEN];
986 const uchar *current_salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
987 const uchar *old_nt_pw_salted_md5_hash = &pwhistory[(i*PW_HISTORY_ENTRY_LEN)+
988 PW_HISTORY_SALT_LEN];
989 if (!memcmp(zero_md5_nt_pw, old_nt_pw_salted_md5_hash, SALTED_MD5_HASH_LEN)) {
990 /* Ignore zero valued entries. */
993 /* Create salted versions of new to compare. */
994 E_md5hash(current_salt, new_nt_p16, new_nt_pw_salted_md5_hash);
996 if (!memcmp(new_nt_pw_salted_md5_hash, old_nt_pw_salted_md5_hash, SALTED_MD5_HASH_LEN)) {
997 DEBUG(1,("check_passwd_history: proposed new password for user %s found in history list !\n",
998 pdb_get_username(sampass) ));
1006 /***********************************************************
1007 Code to change the oem password. Changes both the lanman
1008 and NT hashes. Old_passwd is almost always NULL.
1009 NOTE this function is designed to be called as root. Check the old password
1010 is correct before calling. JRA.
1011 ************************************************************/
1013 NTSTATUS change_oem_password(struct samu *hnd, char *old_passwd, char *new_passwd, BOOL as_root, uint32 *samr_reject_reason)
1015 uint32 min_len, min_age;
1016 struct passwd *pass = NULL;
1017 const char *username = pdb_get_username(hnd);
1018 time_t last_change_time = pdb_get_pass_last_set_time(hnd);
1019 time_t can_change_time = pdb_get_pass_can_change_time(hnd);
1021 if (samr_reject_reason) {
1022 *samr_reject_reason = Undefined;
1025 if (pdb_get_account_policy(AP_MIN_PASSWORD_AGE, &min_age)) {
1027 * Windows calculates the minimum password age check
1028 * dynamically, it basically ignores the pwdcanchange
1029 * timestamp. Do likewise.
1031 if (last_change_time + min_age > time(NULL)) {
1032 DEBUG(1, ("user %s cannot change password now, must "
1033 "wait until %s\n", username,
1034 http_timestring(last_change_time+min_age)));
1035 if (samr_reject_reason) {
1036 *samr_reject_reason = REJECT_REASON_OTHER;
1038 return NT_STATUS_ACCOUNT_RESTRICTION;
1041 if ((can_change_time != 0) && (time(NULL) < can_change_time)) {
1042 DEBUG(1, ("user %s cannot change password now, must "
1043 "wait until %s\n", username,
1044 http_timestring(can_change_time)));
1045 if (samr_reject_reason) {
1046 *samr_reject_reason = REJECT_REASON_OTHER;
1048 return NT_STATUS_ACCOUNT_RESTRICTION;
1052 if (pdb_get_account_policy(AP_MIN_PASSWORD_LEN, &min_len) && (str_charnum(new_passwd) < min_len)) {
1053 DEBUG(1, ("user %s cannot change password - password too short\n",
1055 DEBUGADD(1, (" account policy min password len = %d\n", min_len));
1056 if (samr_reject_reason) {
1057 *samr_reject_reason = REJECT_REASON_TOO_SHORT;
1059 return NT_STATUS_PASSWORD_RESTRICTION;
1060 /* return NT_STATUS_PWD_TOO_SHORT; */
1063 if (check_passwd_history(hnd,new_passwd)) {
1064 if (samr_reject_reason) {
1065 *samr_reject_reason = REJECT_REASON_IN_HISTORY;
1067 return NT_STATUS_PASSWORD_RESTRICTION;
1070 pass = Get_Pwnam(username);
1072 DEBUG(1, ("change_oem_password: Username %s does not exist in system !?!\n", username));
1073 return NT_STATUS_ACCESS_DENIED;
1076 /* Use external script to check password complexity */
1077 if (lp_check_password_script() && *(lp_check_password_script())) {
1080 check_ret = smbrunsecret(lp_check_password_script(), new_passwd);
1081 DEBUG(5, ("change_oem_password: check password script (%s) returned [%d]\n", lp_check_password_script(), check_ret));
1083 if (check_ret != 0) {
1084 DEBUG(1, ("change_oem_password: check password script said new password is not good enough!\n"));
1085 if (samr_reject_reason) {
1086 *samr_reject_reason = REJECT_REASON_NOT_COMPLEX;
1088 return NT_STATUS_PASSWORD_RESTRICTION;
1093 * If unix password sync was requested, attempt to change
1094 * the /etc/passwd database first. Return failure if this cannot
1097 * This occurs before the oem change, because we don't want to
1098 * update it if chgpasswd failed.
1100 * Conditional on lp_unix_password_sync() because we don't want
1101 * to touch the unix db unless we have admin permission.
1104 if(lp_unix_password_sync() &&
1105 !chgpasswd(username, pass, old_passwd, new_passwd, as_root)) {
1106 return NT_STATUS_ACCESS_DENIED;
1109 if (!pdb_set_plaintext_passwd (hnd, new_passwd)) {
1110 return NT_STATUS_ACCESS_DENIED;
1113 /* Now write it into the file. */
1114 return pdb_update_sam_account (hnd);