2 Unix SMB/Netbios implementation.
4 Samba utility functions
5 Copyright (C) Andrew Tridgell 1992-1998
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 /* fork a child process to exec passwd and write to its
23 * tty to change a users password. This is running as the
24 * user who is attempting to change the password.
28 * This code was copied/borrowed and stolen from various sources.
29 * The primary source was the poppasswd.c from the authors of POPMail. This software
30 * was included as a client to change passwords using the 'passwd' program
31 * on the remote machine.
33 * This routine is called by set_user_password() in password.c only if ALLOW_PASSWORD_CHANGE
34 * is defined in the compiler directives located in the Makefile.
36 * This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson
37 * (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences
38 * and rights to modify, distribute or incorporate this change to the CAP suite or
39 * using it for any other reason are granted, so long as this disclaimer is left intact.
43 This code was hacked considerably for inclusion in Samba, primarily
44 by Andrew.Tridgell@anu.edu.au. The biggest change was the addition
45 of the "password chat" option, which allows the easy runtime
46 specification of the expected sequence of events to change a
52 extern int DEBUGLEVEL;
54 #if ALLOW_CHANGE_PASSWORD
55 #define MINPASSWDLENGTH 5
58 static int findpty(char **slave)
65 #endif /* !HAVE_GRANTPT */
67 #if defined(HAVE_GRANTPT)
68 if ((master = open("/dev/ptmx", O_RDWR)) >= 1) {
71 *slave = ptsname(master);
73 DEBUG(0,("findpty: Unable to create master/slave pty pair.\n"));
76 DEBUG(10, ("findpty: Allocated slave pty %s\n", *slave));
80 #else /* HAVE_GRANTPT */
81 fstrcpy( line, "/dev/ptyXX" );
83 dirp = OpenDir(-1, "/dev", False);
84 if (!dirp) return(-1);
85 while ((dpname = ReadDirName(dirp)) != NULL) {
86 if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5) {
87 DEBUG(3,("pty: try to open %s, line was %s\n", dpname, line ) );
90 if ((master = open(line, O_RDWR)) >= 0) {
91 DEBUG(3,("pty: opened %s\n", line ) );
100 #endif /* HAVE_GRANTPT */
104 static int dochild(int master,char *slavedev, char *name, char *passwordprogram, BOOL as_root)
107 struct termios stermios;
108 struct passwd *pass = Get_Pwnam(name,True);
113 DEBUG(0,("dochild: user name %s doesn't exist in the UNIX password database.\n",
120 #ifdef HAVE_SETRESUID
126 /* Start new session - gets rid of controlling terminal. */
128 DEBUG(3,("Weirdness, couldn't let go of controlling terminal\n"));
132 /* Open slave pty and acquire as new controlling terminal. */
133 if ((slave = open(slavedev, O_RDWR)) < 0) {
134 DEBUG(3,("More weirdness, could not open %s\n",
139 ioctl(slave, I_PUSH, "ptem");
140 ioctl(slave, I_PUSH, "ldterm");
141 #elif defined(TIOCSCTTY)
142 if (ioctl(slave,TIOCSCTTY,0) <0) {
143 DEBUG(3,("Error in ioctl call for slave pty\n"));
151 /* Make slave stdin/out/err of child. */
153 if (dup2(slave, STDIN_FILENO) != STDIN_FILENO) {
154 DEBUG(3,("Could not re-direct stdin\n"));
157 if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO) {
158 DEBUG(3,("Could not re-direct stdout\n"));
161 if (dup2(slave, STDERR_FILENO) != STDERR_FILENO) {
162 DEBUG(3,("Could not re-direct stderr\n"));
165 if (slave > 2) close(slave);
167 /* Set proper terminal attributes - no echo, canonical input processing,
168 no map NL to CR/NL on output. */
170 if (tcgetattr(0, &stermios) < 0) {
171 DEBUG(3,("could not read default terminal attributes on pty\n"));
174 stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
175 stermios.c_lflag |= ICANON;
176 stermios.c_oflag &= ~(ONLCR);
177 if (tcsetattr(0, TCSANOW, &stermios) < 0) {
178 DEBUG(3,("could not set attributes of pty\n"));
182 /* make us completely into the right uid */
184 #ifdef HAVE_SETRESUID
187 setresgid(gid,gid,gid);
188 setresuid(uid,uid,uid);
199 DEBUG(10, ("Invoking '%s' as password change program.\n", passwordprogram));
201 /* execl() password-change application */
202 if (execl("/bin/sh","sh","-c",passwordprogram,NULL) < 0) {
203 DEBUG(3,("Bad status returned from %s\n",passwordprogram));
209 static int expect(int master,char *expected,char *buf)
216 if (n >= BUFSIZE-1) {
220 /* allow 4 seconds for some output to appear */
221 m = read_with_timeout(master, buf+n, 1, BUFSIZE-1-n, 4000);
231 pstrcpy(s2,expected);
232 if (do_match(s1, s2, False))
238 static void pwd_sub(char *buf)
240 string_sub(buf,"\\n","\n");
241 string_sub(buf,"\\r","\r");
242 string_sub(buf,"\\s"," ");
243 string_sub(buf,"\\t","\t");
246 static void writestring(int fd,char *s)
255 static int talktochild(int master, char *chatsequence)
259 char *ptr=chatsequence;
265 while (next_token(&ptr,chatbuf,NULL)) {
269 if (!strequal(chatbuf,"."))
270 ok = expect(master,chatbuf,buf);
272 if(lp_passwd_chat_debug())
273 DEBUG(100,("talktochild: chatbuf=[%s] responsebuf=[%s]\n",chatbuf,buf));
276 DEBUG(3,("response %d incorrect\n",count));
280 if (!next_token(&ptr,chatbuf,NULL)) break;
282 if (!strequal(chatbuf,"."))
283 writestring(master,chatbuf);
285 if(lp_passwd_chat_debug())
286 DEBUG(100,("talktochild: sendbuf=[%s]\n",chatbuf));
289 if (count<1) return(False);
295 BOOL chat_with_program(char *passwordprogram,char *name,char *chatsequence, BOOL as_root)
303 /* allocate a pseudo-terminal device */
304 if ((master = findpty (&slavedev)) < 0) {
305 DEBUG(3,("Cannot Allocate pty for password change: %s",name));
309 if ((pid = fork()) < 0) {
310 DEBUG(3,("Cannot fork() child for password change: %s",name));
314 /* we now have a pty */
315 if (pid > 0){ /* This is the parent process */
316 if ((chstat = talktochild(master, chatsequence)) == False) {
317 DEBUG(3,("Child failed to change password: %s\n",name));
318 kill(pid, SIGKILL); /* be sure to end this process */
320 if ((wpid = sys_waitpid(pid, &wstat, 0)) < 0) {
321 DEBUG(3,("The process is no longer waiting!\n\n"));
325 DEBUG(3,("We were waiting for the wrong process ID\n"));
328 if (WIFEXITED(wstat) == 0) {
329 DEBUG(3,("The process exited while we were waiting\n"));
332 if (WEXITSTATUS(wstat) != 0) {
333 DEBUG(3,("The status of the process exiting was %d\n", wstat));
340 /* make sure it doesn't freeze */
345 DEBUG(3,("Dochild for user %s (uid=%d,gid=%d)\n",name,getuid(),getgid()));
346 chstat = dochild(master, slavedev, name, passwordprogram, as_root);
349 unbecome_root(False);
353 DEBUG(3,("Password change %ssuccessful for user %s\n", (chstat?"":"un"), name));
358 BOOL chgpasswd(char *name,char *oldpass,char *newpass, BOOL as_root)
360 pstring passwordprogram;
361 pstring chatsequence;
366 DEBUG(3,("Password change for user: %s\n",name));
369 DEBUG(100,("Passwords: old=%s new=%s\n",oldpass,newpass));
372 /* Take the passed information and test it for minimum criteria */
373 /* Minimum password length */
374 if (strlen(newpass) < MINPASSWDLENGTH) /* too short, must be at least MINPASSWDLENGTH */
376 DEBUG(2,("Password Change: %s, New password is shorter than MINPASSWDLENGTH\n",name));
377 return (False); /* inform the user */
380 /* Password is same as old password */
381 if (strcmp(oldpass,newpass) == 0) /* don't allow same password */
383 DEBUG(2,("Password Change: %s, New password is same as old\n",name)); /* log the attempt */
384 return (False); /* inform the user */
387 pstrcpy(passwordprogram,lp_passwd_program());
388 pstrcpy(chatsequence,lp_passwd_chat());
390 if (!*chatsequence) {
391 DEBUG(2,("Null chat sequence - no password changing\n"));
395 if (!*passwordprogram) {
396 DEBUG(2,("Null password program - no password changing\n"));
401 * Check the old and new passwords don't contain any control
405 len = strlen(oldpass);
406 for(i = 0; i < len; i++) {
407 if(iscntrl(oldpass[i])) {
408 DEBUG(0,("chat_with_program: oldpass contains control characters (disallowed).\n"));
413 len = strlen(newpass);
414 for(i = 0; i < len; i++) {
415 if(iscntrl(newpass[i])) {
416 DEBUG(0,("chat_with_program: newpass contains control characters (disallowed).\n"));
421 string_sub(passwordprogram,"%u",name);
422 string_sub(passwordprogram,"%o",oldpass);
423 string_sub(passwordprogram,"%n",newpass);
425 string_sub(chatsequence,"%u",name);
426 string_sub(chatsequence,"%o",oldpass);
427 string_sub(chatsequence,"%n",newpass);
428 return(chat_with_program(passwordprogram,name,chatsequence, as_root));
431 #else /* ALLOW_CHANGE_PASSWORD */
432 BOOL chgpasswd(char *name,char *oldpass,char *newpass, BOOL as_root)
434 DEBUG(0,("Password changing not compiled in (user=%s)\n",name));
437 #endif /* ALLOW_CHANGE_PASSWORD */
439 /***********************************************************
440 Code to check the lanman hashed password.
441 ************************************************************/
443 BOOL check_lanman_password(char *user, unsigned char *pass1,
444 unsigned char *pass2, struct smb_passwd **psmbpw)
446 unsigned char unenc_new_pw[16];
447 unsigned char unenc_old_pw[16];
448 unsigned char null_pw[16];
449 struct smb_passwd *smbpw;
454 smbpw = getsmbpwnam(user);
459 DEBUG(0,("check_lanman_password: getsmbpwnam returned NULL\n"));
463 if(smbpw->acct_ctrl & ACB_DISABLED)
465 DEBUG(0,("check_lanman_password: account %s disabled.\n", user));
469 if((smbpw->smb_passwd == NULL) && (smbpw->acct_ctrl & ACB_PWNOTREQ))
471 unsigned char no_pw[14];
472 memset(no_pw, '\0', 14);
473 E_P16((uchar *)no_pw, (uchar *)null_pw);
474 smbpw->smb_passwd = null_pw;
475 } else if (smbpw->smb_passwd == NULL) {
476 DEBUG(0,("check_lanman_password: no lanman password !\n"));
480 /* Get the new lanman hash. */
481 D_P16(smbpw->smb_passwd, pass2, unenc_new_pw);
483 /* Use this to get the old lanman hash. */
484 D_P16(unenc_new_pw, pass1, unenc_old_pw);
486 /* Check that the two old passwords match. */
487 if(memcmp(smbpw->smb_passwd, unenc_old_pw, 16))
489 DEBUG(0,("check_lanman_password: old password doesn't match.\n"));
497 /***********************************************************
498 Code to change the lanman hashed password.
499 It nulls out the NT hashed password as it will
501 ************************************************************/
503 BOOL change_lanman_password(struct smb_passwd *smbpw, unsigned char *pass1, unsigned char *pass2)
505 unsigned char unenc_new_pw[16];
506 unsigned char null_pw[16];
511 DEBUG(0,("change_lanman_password: no smb password entry.\n"));
515 if(smbpw->acct_ctrl & ACB_DISABLED)
517 DEBUG(0,("change_lanman_password: account %s disabled.\n", smbpw->smb_name));
521 if((smbpw->smb_passwd == NULL) && (smbpw->acct_ctrl & ACB_PWNOTREQ))
523 unsigned char no_pw[14];
524 memset(no_pw, '\0', 14);
525 E_P16((uchar *)no_pw, (uchar *)null_pw);
526 smbpw->smb_passwd = null_pw;
527 } else if (smbpw->smb_passwd == NULL) {
528 DEBUG(0,("change_lanman_password: no lanman password !\n"));
532 /* Get the new lanman hash. */
533 D_P16(smbpw->smb_passwd, pass2, unenc_new_pw);
535 smbpw->smb_passwd = unenc_new_pw;
536 smbpw->smb_nt_passwd = NULL; /* We lose the NT hash. Sorry. */
538 /* Now write it into the file. */
540 ret = mod_smbpwd_entry(smbpw,False);
546 /***********************************************************
547 Code to check the OEM hashed password.
548 ************************************************************/
550 BOOL check_oem_password(char *user, unsigned char *data,
551 struct smb_passwd **psmbpw, char *new_passwd,
554 struct smb_passwd *smbpw = NULL;
556 fstring upper_case_new_passwd;
557 unsigned char new_p16[16];
558 unsigned char unenc_old_pw[16];
559 unsigned char null_pw[16];
562 *psmbpw = smbpw = getsmbpwnam(user);
567 DEBUG(0,("check_oem_password: getsmbpwnam returned NULL\n"));
571 if(smbpw->acct_ctrl & ACB_DISABLED)
573 DEBUG(0,("check_lanman_password: account %s disabled.\n", user));
577 if((smbpw->smb_passwd == NULL) && (smbpw->acct_ctrl & ACB_PWNOTREQ))
579 unsigned char no_pw[14];
580 memset(no_pw, '\0', 14);
581 E_P16((uchar *)no_pw, (uchar *)null_pw);
582 smbpw->smb_passwd = null_pw;
583 } else if (smbpw->smb_passwd == NULL) {
584 DEBUG(0,("check_oem_password: no lanman password !\n"));
589 * Call the hash function to get the new password.
591 SamOEMhash( (unsigned char *)data, (unsigned char *)smbpw->smb_passwd, True);
594 * The length of the new password is in the last 4 bytes of
597 new_pw_len = IVAL(data,512);
598 if(new_pw_len < 0 || new_pw_len > new_passwd_size - 1) {
599 DEBUG(0,("check_oem_password: incorrect password length (%d).\n", new_pw_len));
603 memcpy(new_passwd, &data[512-new_pw_len], new_pw_len);
604 new_passwd[new_pw_len] = '\0';
607 * To ensure we got the correct new password, hash it and
608 * use it as a key to test the passed old password.
611 memset(upper_case_new_passwd, '\0', sizeof(upper_case_new_passwd));
612 fstrcpy(upper_case_new_passwd, new_passwd);
613 strupper(upper_case_new_passwd);
615 E_P16((uchar *)upper_case_new_passwd, new_p16);
618 * Now use new_p16 as the key to see if the old
621 D_P16(new_p16, &data[516], unenc_old_pw);
623 if(memcmp(smbpw->smb_passwd, unenc_old_pw, 16)) {
624 DEBUG(0,("check_oem_password: old password doesn't match.\n"));
628 memset(upper_case_new_passwd, '\0', strlen(upper_case_new_passwd));
633 /***********************************************************
634 Code to change the oem password. Changes both the lanman
636 override = False, normal
637 override = True, override XXXXXXXXXX'd password
638 ************************************************************/
640 BOOL change_oem_password(struct smb_passwd *smbpw, char *new_passwd, BOOL override)
643 fstring upper_case_new_passwd;
644 unsigned char new_nt_p16[16];
645 unsigned char new_p16[16];
647 memset(upper_case_new_passwd, '\0', sizeof(upper_case_new_passwd));
648 fstrcpy(upper_case_new_passwd, new_passwd);
649 strupper(upper_case_new_passwd);
651 E_P16((uchar *)upper_case_new_passwd, new_p16);
653 smbpw->smb_passwd = new_p16;
655 E_md4hash((uchar *) new_passwd, new_nt_p16);
656 smbpw->smb_nt_passwd = new_nt_p16;
658 /* Now write it into the file. */
660 ret = mod_smbpwd_entry(smbpw,override);
663 memset(upper_case_new_passwd, '\0', strlen(upper_case_new_passwd));
664 memset(new_passwd, '\0', strlen(new_passwd));