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chgpasswd.c

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   Samba utility functions
   Copyright (C) Andrew Tridgell 1992-1998
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

/* fork a child process to exec passwd and write to its
 * tty to change a users password. This is running as the
 * user who is attempting to change the password.
 */

/* 
 * This code was copied/borrowed and stolen from various sources.
 * The primary source was the poppasswd.c from the authors of POPMail. This software
 * was included as a client to change passwords using the 'passwd' program
 * on the remote machine.
 *
 * This routine is called by set_user_password() in password.c only if ALLOW_PASSWORD_CHANGE
 * is defined in the compiler directives located in the Makefile.
 *
 * This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson
 * (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences
 * and rights to modify, distribute or incorporate this change to the CAP suite or
 * using it for any other reason are granted, so long as this disclaimer is left intact.
 */

/*
   This code was hacked considerably for inclusion in Samba, primarily
   by Andrew.Tridgell@anu.edu.au. The biggest change was the addition
   of the "password chat" option, which allows the easy runtime
   specification of the expected sequence of events to change a
   password.
   */

#include "includes.h"

#if ALLOW_CHANGE_PASSWORD

static int findpty(char **slave)
{
      int master;
      static fstring line;
      DIR *dirp;
      char *dpname;

#if defined(HAVE_GRANTPT)
      /* Try to open /dev/ptmx. If that fails, fall through to old method. */
      if ((master = sys_open("/dev/ptmx", O_RDWR, 0)) >= 0)
      {
            grantpt(master);
            unlockpt(master);
            *slave = (char *)ptsname(master);
            if (*slave == NULL)
            {
                  DEBUG(0,
                        ("findpty: Unable to create master/slave pty pair.\n"));
                  /* Stop fd leak on error. */
                  close(master);
                  return -1;
            }
            else
            {
                  DEBUG(10,
                        ("findpty: Allocated slave pty %s\n", *slave));
                  return (master);
            }
      }
#endif /* HAVE_GRANTPT */

      fstrcpy(line, "/dev/ptyXX");

      dirp = opendir("/dev");
      if (!dirp)
            return (-1);
      while ((dpname = readdirname(dirp)) != NULL)
      {
            if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5)
            {
                  DEBUG(3,
                        ("pty: try to open %s, line was %s\n", dpname,
                         line));
                  line[8] = dpname[3];
                  line[9] = dpname[4];
                  if ((master = sys_open(line, O_RDWR, 0)) >= 0)
                  {
                        DEBUG(3, ("pty: opened %s\n", line));
                        line[5] = 't';
                        *slave = line;
                        closedir(dirp);
                        return (master);
                  }
            }
      }
      closedir(dirp);
      return (-1);
}

static int dochild(int master, char *slavedev, char *name,
               char *passwordprogram, BOOL as_root)
{
      int slave;
      struct termios stermios;
      struct passwd *pass = Get_Pwnam(name, True);
      gid_t gid;
      uid_t uid;

      if (pass == NULL)
      {
            DEBUG(0,
                  ("dochild: user name %s doesn't exist in the UNIX password database.\n",
                   name));
            return False;
      }

      gid = pass->pw_gid;
      uid = pass->pw_uid;

      gain_root_privilege();

      /* Start new session - gets rid of controlling terminal. */
      if (setsid() < 0)
      {
            DEBUG(3,
                  ("Weirdness, couldn't let go of controlling terminal\n"));
            return (False);
      }

      /* Open slave pty and acquire as new controlling terminal. */
      if ((slave = sys_open(slavedev, O_RDWR, 0)) < 0)
      {
            DEBUG(3, ("More weirdness, could not open %s\n", slavedev));
            return (False);
      }
#ifdef I_PUSH
      ioctl(slave, I_PUSH, "ptem");
      ioctl(slave, I_PUSH, "ldterm");
#elif defined(TIOCSCTTY)
      if (ioctl(slave, TIOCSCTTY, 0) < 0)
      {
            DEBUG(3, ("Error in ioctl call for slave pty\n"));
            /* return(False); */
      }
#endif

      /* Close master. */
      close(master);

      /* Make slave stdin/out/err of child. */

      if (dup2(slave, STDIN_FILENO) != STDIN_FILENO)
      {
            DEBUG(3, ("Could not re-direct stdin\n"));
            return (False);
      }
      if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
      {
            DEBUG(3, ("Could not re-direct stdout\n"));
            return (False);
      }
      if (dup2(slave, STDERR_FILENO) != STDERR_FILENO)
      {
            DEBUG(3, ("Could not re-direct stderr\n"));
            return (False);
      }
      if (slave > 2)
            close(slave);

      /* Set proper terminal attributes - no echo, canonical input processing,
         no map NL to CR/NL on output. */

      if (tcgetattr(0, &stermios) < 0)
      {
            DEBUG(3,
                  ("could not read default terminal attributes on pty\n"));
            return (False);
      }
      stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
      stermios.c_lflag |= ICANON;
#ifdef ONLCR
      stermios.c_oflag &= ~(ONLCR);
#endif
      if (tcsetattr(0, TCSANOW, &stermios) < 0) {
            DEBUG(3, ("could not set attributes of pty\n"));
            return (False);
      }

      /* make us completely into the right uid */
      if (!as_root) {
            become_user_permanently(uid, gid);
      }

      DEBUG(10,
            ("Invoking '%s' as password change program.\n",
             passwordprogram));

      /* execl() password-change application */
      if (execl("/bin/sh", "sh", "-c", passwordprogram, NULL) < 0)
      {
            DEBUG(3, ("Bad status returned from %s\n", passwordprogram));
            return (False);
      }
      return (True);
}

static int expect(int master, char *issue, char *expected)
{
      pstring buffer;
      int attempts, timeout, nread, len;
      BOOL match = False;

      for (attempts = 0; attempts < 2; attempts++) {
            if (!strequal(issue, ".")) {
                  if (lp_passwd_chat_debug())
                        DEBUG(100, ("expect: sending [%s]\n", issue));

                  if ((len = write(master, issue, strlen(issue))) != strlen(issue)) {
                        DEBUG(2,("expect: (short) write returned %d\n", len ));
                        return False;
                  }
            }

            if (strequal(expected, "."))
                  return True;

            timeout = 2000;
            nread = 0;
            buffer[nread] = 0;

            while ((len = read_with_timeout(master, buffer + nread, 1,
                                    sizeof(buffer) - nread - 1,
                                    timeout)) > 0) {
                  nread += len;
                  buffer[nread] = 0;

                  {
                        /* Eat leading/trailing whitespace before match. */
                        pstring str;
                        unix_to_dos(str, buffer);
                        trim_string( str, strlen( str ) + 1, " ", sizeof( " " ), " ", sizeof( " " ));

                        if ((match = (unix_wild_match(expected, str) == 0)))
                              timeout = 200;
                  }
            }

            if (lp_passwd_chat_debug())
                  DEBUG(100, ("expect: expected [%s] received [%s] match %s\n",
                            expected, buffer, match ? "yes" : "no" ));

            if (match)
                  break;

            if (len < 0) {
                  DEBUG(2, ("expect: %s\n", strerror(errno)));
                  return False;
            }
      }

      DEBUG(10,("expect: returning %s\n", match ? "True" : "False" ));
      return match;
}

static void pwd_sub(char *buf)
{
      all_string_sub(buf, "\\n", "\n", 0);
      all_string_sub(buf, "\\r", "\r", 0);
      all_string_sub(buf, "\\s", " ", 0);
      all_string_sub(buf, "\\t", "\t", 0);
}

static int talktochild(int master, const char *seq)
{
      int count = 0;
      fstring issue, expected;

      fstrcpy(issue, ".");

      while (next_token(&seq, expected, NULL, sizeof(expected)))
      {
            pwd_sub(expected);
            count++;

            if (!expect(master, issue, expected))
            {
                  DEBUG(3, ("Response %d incorrect\n", count));
                  return False;
            }

            if (!next_token(&seq, issue, NULL, sizeof(issue)))
                  fstrcpy(issue, ".");

            pwd_sub(issue);
      }
      if (!strequal(issue, ".")) {
            /* we have one final issue to send */
            fstrcpy(expected, ".");
            if (!expect(master, issue, expected))
                  return False;
      }

      return (count > 0);
}

static BOOL chat_with_program(char *passwordprogram, char *name,
                        char *chatsequence, BOOL as_root)
{
      char *slavedev;
      int master;
      pid_t pid, wpid;
      int wstat;
      BOOL chstat = False;

      /* allocate a pseudo-terminal device */
      if ((master = findpty(&slavedev)) < 0)
      {
            DEBUG(3,
                  ("Cannot Allocate pty for password change: %s\n",
                   name));
            return (False);
      }

      /*
       * We need to temporarily stop CatchChild from eating
       * SIGCLD signals as it also eats the exit status code. JRA.
       */

      CatchChildLeaveStatus();

      if ((pid = sys_fork()) < 0)
      {
            DEBUG(3,
                  ("Cannot fork() child for password change: %s\n",
                   name));
            close(master);
            CatchChild();
            return (False);
      }

      /* we now have a pty */
      if (pid > 0)
      {                 /* This is the parent process */
            if ((chstat = talktochild(master, chatsequence)) == False)
            {
                  DEBUG(3,
                        ("Child failed to change password: %s\n",
                         name));
                  kill(pid, SIGKILL);     /* be sure to end this process */
            }

            while ((wpid = sys_waitpid(pid, &wstat, 0)) < 0)
            {
                  if (errno == EINTR)
                  {
                        errno = 0;
                        continue;
                  }
                  break;
            }

            if (wpid < 0)
            {
                  DEBUG(3, ("The process is no longer waiting!\n\n"));
                  close(master);
                  CatchChild();
                  return (False);
            }

            /*
             * Go back to ignoring children.
             */
            CatchChild();

            close(master);

            if (pid != wpid)
            {
                  DEBUG(3,
                        ("We were waiting for the wrong process ID\n"));
                  return (False);
            }
            if (WIFEXITED(wstat) == 0)
            {
                  DEBUG(3,
                        ("The process exited while we were waiting\n"));
                  return (False);
            }
            if (WEXITSTATUS(wstat) != 0)
            {
                  DEBUG(3,
                        ("The status of the process exiting was %d\n",
                         wstat));
                  return (False);
            }

      }
      else
      {
            /* CHILD */

            /*
             * Lose any oplock capabilities.
             */
            oplock_set_capability(False, False);

            /* make sure it doesn't freeze */
            alarm(20);

            if (as_root)
                  become_root();

            DEBUG(3,
                  ("Dochild for user %s (uid=%d,gid=%d)\n", name,
                   (int)getuid(), (int)getgid()));
            chstat =
                  dochild(master, slavedev, name, passwordprogram,
                        as_root);

            if (as_root)
                  unbecome_root();

            /*
             * The child should never return from dochild() ....
             */

            DEBUG(0,
                  ("chat_with_program: Error: dochild() returned %d\n",
                   chstat));
            exit(1);
      }

      if (chstat)
            DEBUG(3,
                  ("Password change %ssuccessful for user %s\n",
                   (chstat ? "" : "un"), name));
      return (chstat);
}


BOOL chgpasswd(char *name, const char *oldpass, const char *newpass, BOOL as_root)
{
      pstring passwordprogram;
      pstring chatsequence;
      size_t i;
      size_t len;

      strlower(name);
      DEBUG(3, ("Password change for user: %s\n", name));

#if DEBUG_PASSWORD
      DEBUG(100, ("Passwords: old=%s new=%s\n", oldpass, newpass));
#endif

      /* Take the passed information and test it for minimum criteria */
      /* Minimum password length */
      if (strlen(newpass) < lp_min_passwd_length()) {
            /* too short, must be at least MINPASSWDLENGTH */
            DEBUG(0, ("Password Change: user %s, New password is shorter than minimum password length = %d\n",
                   name, lp_min_passwd_length()));
            return (False);   /* inform the user */
      }

      /* Password is same as old password */
      if (strcmp(oldpass, newpass) == 0) {
            /* don't allow same password */
            DEBUG(2, ("Password Change: %s, New password is same as old\n", name)); /* log the attempt */
            return (False);   /* inform the user */
      }

      /* 
       * Check the old and new passwords don't contain any control
       * characters.
       */

      len = strlen(oldpass);
      for (i = 0; i < len; i++) {
            if (iscntrl((int)oldpass[i])) {
                  DEBUG(0,
                        ("chat_with_program: oldpass contains control characters (disallowed).\n"));
                  return False;
            }
      }

      len = strlen(newpass);
      for (i = 0; i < len; i++) {
            if (iscntrl((int)newpass[i])) {
                  DEBUG(0,
                        ("chat_with_program: newpass contains control characters (disallowed).\n"));
                  return False;
            }
      }

#ifdef WITH_PAM
      if (lp_pam_password_change()) {
            BOOL ret;

            if (as_root)
                  become_root();

            ret = smb_pam_passchange(name, oldpass, newpass);

            if (as_root)
                  unbecome_root();

            return ret;
      }
#endif

      pstrcpy(passwordprogram, lp_passwd_program());
      pstrcpy(chatsequence, lp_passwd_chat());

      if (!*chatsequence) {
            DEBUG(2, ("chgpasswd: Null chat sequence - no password changing\n"));
            return (False);
      }

      if (!*passwordprogram) {
            DEBUG(2, ("chgpasswd: Null password program - no password changing\n"));
            return (False);
      }

      if (as_root) {
            /* The password program *must* contain the user name to work. Fail if not. */
            if (strstr(passwordprogram, "%u") == NULL) {
                  DEBUG(0,("chgpasswd: Running as root the 'passwd program' parameter *MUST* contain \
the string %%u, and the given string %s does not.\n", passwordprogram ));
                  return False;
            }
      }

      pstring_sub(passwordprogram, "%u", name, False);
      /* note that we do NOT substitute the %o and %n in the password program
         as this would open up a security hole where the user could use
         a new password containing shell escape characters */

      pstring_sub(chatsequence, "%u", name, False);
      all_string_sub(chatsequence, "%o", oldpass, sizeof(pstring));
      all_string_sub(chatsequence, "%n", newpass, sizeof(pstring));
      return (chat_with_program
            (passwordprogram, name, chatsequence, as_root));
}

#else /* ALLOW_CHANGE_PASSWORD */

BOOL chgpasswd(char *name, const char *oldpass, const char *newpass, BOOL as_root)
{
      DEBUG(0, ("Password changing not compiled in (user=%s)\n", name));
      return (False);
}
#endif /* ALLOW_CHANGE_PASSWORD */

/***********************************************************
 Code to check the lanman hashed password.
************************************************************/

BOOL check_lanman_password(char *user, uchar * pass1,
                     uchar * pass2, SAM_ACCOUNT **hnd)
{
      static uchar null_pw[16];
      uchar unenc_new_pw[16];
      uchar unenc_old_pw[16];
      SAM_ACCOUNT *sampass = NULL;
      uint16 acct_ctrl;
      uint8 *lanman_pw;
      BOOL ret;
      
      become_root();
      ret = pdb_getsampwnam(sampass, user);
      unbecome_root();

      if (ret == False) {
            DEBUG(0,("check_lanman_password: getsampwnam returned NULL\n"));
            pdb_free_sam(sampass);
            return False;
      }
      
      acct_ctrl = pdb_get_acct_ctrl     (sampass);
      lanman_pw = pdb_get_lanman_passwd (sampass);

      if (acct_ctrl & ACB_DISABLED) {
            DEBUG(0,("check_lanman_password: account %s disabled.\n", user));
            pdb_free_sam(sampass);
            return False;
      }

      if ((lanman_pw == NULL) && (acct_ctrl & ACB_PWNOTREQ)) {
            uchar no_pw[14];
            memset(no_pw, '\0', 14);
            E_P16(no_pw, null_pw);
            if (!pdb_set_lanman_passwd(sampass, null_pw)) {
                  pdb_free_sam(sampass);
                  return False;
            }
      }
      else if (lanman_pw == NULL) {
            DEBUG(0, ("check_lanman_password: no lanman password !\n"));
            pdb_free_sam(sampass);
            return False;
      }

      /* Get the new lanman hash. */
      D_P16(lanman_pw, pass2, unenc_new_pw);

      /* Use this to get the old lanman hash. */
      D_P16(unenc_new_pw, pass1, unenc_old_pw);

      /* Check that the two old passwords match. */
      if (memcmp(lanman_pw, unenc_old_pw, 16)) {
            DEBUG(0,("check_lanman_password: old password doesn't match.\n"));
            pdb_free_sam(sampass);
            return False;
      }

      /* this saves the pointer for the caller */
      *hnd = sampass;
      
      return True;
}

/***********************************************************
 Code to change the lanman hashed password.
 It nulls out the NT hashed password as it will
 no longer be valid.
************************************************************/

BOOL change_lanman_password(SAM_ACCOUNT *sampass, uchar * pass1,
                      uchar * pass2)
{
      static uchar null_pw[16];
      uchar unenc_new_pw[16];
      BOOL ret;
      uint16 acct_ctrl;
      uint8 *pwd;

      if (sampass == NULL) {
            DEBUG(0,("change_lanman_password: no smb password entry.\n"));
            return False;
      }
      
      acct_ctrl = pdb_get_acct_ctrl(sampass);
      pwd = pdb_get_lanman_passwd(sampass);

      if (acct_ctrl & ACB_DISABLED) {
            DEBUG(0,("change_lanman_password: account %s disabled.\n",
                   pdb_get_username(sampass)));
            return False;
      }

      if ((pwd == NULL) && (acct_ctrl & ACB_PWNOTREQ)) {
            uchar no_pw[14];
            memset(no_pw, '\0', 14);
            E_P16(no_pw, null_pw);
            if (!pdb_set_lanman_passwd(sampass, null_pw))
                  return False;
      }
      else if (pwd == NULL) {
            DEBUG(0,("change_lanman_password: no lanman password !\n"));
            return False;
      }

      /* Get the new lanman hash. */
      D_P16(pwd, pass2, unenc_new_pw);

      if (!pdb_set_lanman_passwd(sampass, unenc_new_pw))
            return False;
      pdb_set_nt_passwd    (sampass, NULL);     /* We lose the NT hash. Sorry. */

      /* Now flush the sam_passwd struct to persistent storage */
      become_root();
      ret = pdb_update_sam_account (sampass, False);
      unbecome_root();

      return ret;
}

/***********************************************************
 Code to check and change the OEM hashed password.
************************************************************/
BOOL pass_oem_change(char *user,
                 uchar * lmdata, uchar * lmhash,
                 uchar * ntdata, uchar * nthash)
{
      fstring new_passwd;
      SAM_ACCOUNT *sampass = NULL;
      BOOL ret = check_oem_password(user, lmdata, lmhash, ntdata, nthash,
                              &sampass, new_passwd, sizeof(new_passwd));

      /* 
       * At this point we have the new case-sensitive plaintext
       * password in the fstring new_passwd. If we wanted to synchronise
       * with UNIX passwords we would call a UNIX password changing 
       * function here. However it would have to be done as root
       * as the plaintext of the old users password is not 
       * available. JRA.
       */

      if (ret && lp_unix_password_sync())
            ret = chgpasswd(user, "", new_passwd, True);

      if (ret)
            ret = change_oem_password(sampass, new_passwd, False);

      memset(new_passwd, 0, sizeof(new_passwd));

      pdb_free_sam(sampass);

      return ret;
}

/***********************************************************
 Code to check the OEM hashed password.

 this function ignores the 516 byte nt OEM hashed password
 but does use the lm OEM password to check the nt hashed-hash.

************************************************************/

BOOL check_oem_password(char *user,
                  uchar * lmdata, uchar * lmhash,
                  uchar * ntdata, uchar * nthash,
                  SAM_ACCOUNT **hnd, char *new_passwd,
                  int new_passwd_size)
{
      static uchar null_pw[16];
      static uchar null_ntpw[16];
      SAM_ACCOUNT *sampass = NULL;
      uint8 *lanman_pw, *nt_pw;
      uint16 acct_ctrl;
      int new_pw_len;
      uchar new_ntp16[16];
      uchar unenc_old_ntpw[16];
      uchar new_p16[16];
      uchar unenc_old_pw[16];
      char no_pw[2];
      BOOL ret;

      BOOL nt_pass_set = (ntdata != NULL && nthash != NULL);

      *hnd = NULL;

      pdb_init_sam(&sampass);

      become_root();
      ret = pdb_getsampwnam(sampass, user);
      unbecome_root();

      if (ret == False) {
            DEBUG(0, ("check_oem_password: getsmbpwnam returned NULL\n"));
            pdb_free_sam(sampass);
            return False;
      }

      acct_ctrl = pdb_get_acct_ctrl(sampass);
      
      if (acct_ctrl & ACB_DISABLED) {
            DEBUG(0,("check_lanman_password: account %s disabled.\n", user));
            pdb_free_sam(sampass);
            return False;
      }

      /* construct a null password (in case one is needed */
      no_pw[0] = 0;
      no_pw[1] = 0;
      nt_lm_owf_gen(no_pw, null_ntpw, null_pw);

      /* save pointers to passwords so we don't have to keep looking them up */
      lanman_pw = pdb_get_lanman_passwd(sampass);
      nt_pw = pdb_get_nt_passwd(sampass);

      /* check for null passwords */
      if (lanman_pw == NULL) {
            if (acct_ctrl & ACB_PWNOTREQ) {
                  if (!pdb_set_lanman_passwd(sampass, null_pw)) {
                        pdb_free_sam(sampass);
                        return False;
                  }
                  lanman_pw = pdb_get_lanman_passwd(sampass);
                  if (!lanman_pw) {
                        pdb_free_sam(sampass);
                        return False;
                  }
            } else {
                  DEBUG(0,("check_oem_password: no lanman password !\n"));
                  pdb_free_sam(sampass);
                  return False;
            }
      }

      if (pdb_get_nt_passwd(sampass) == NULL && nt_pass_set) {
            if (acct_ctrl & ACB_PWNOTREQ) {
                  pdb_set_nt_passwd(sampass, null_ntpw);
                  nt_pw = pdb_get_nt_passwd(sampass);
                  if (!nt_pw) {
                        pdb_free_sam(sampass);
                        return False;
                  }
            } else {
                  DEBUG(0,("check_oem_password: no ntlm password !\n"));
                  pdb_free_sam(sampass);
                  return False;
            }
      }

      /* 
       * Call the hash function to get the new password.
       */
      SamOEMhash((uchar *) lmdata, (uchar *)lanman_pw, 516);

      /* 
       * The length of the new password is in the last 4 bytes of
       * the data buffer.
       */

      new_pw_len = IVAL(lmdata, 512);
      if (new_pw_len < 0 || new_pw_len > new_passwd_size - 1) {
            DEBUG(0,("check_oem_password: incorrect password length (%d).\n", new_pw_len));
            pdb_free_sam(sampass);
            return False;
      }

      if (nt_pass_set) {
            /*
             * nt passwords are in unicode
             */
            int uni_pw_len = new_pw_len;
            char *pw;
            new_pw_len /= 2;
            pw = dos_unistrn2((uint16 *)(&lmdata[512 - uni_pw_len]), new_pw_len);
            memcpy(new_passwd, pw, new_pw_len + 1);
      } else {
            memcpy(new_passwd, &lmdata[512 - new_pw_len], new_pw_len);
            new_passwd[new_pw_len] = 0;
      }

      /*
       * To ensure we got the correct new password, hash it and
       * use it as a key to test the passed old password.
       */

      nt_lm_owf_gen(new_passwd, new_ntp16, new_p16);

      if (!nt_pass_set) {
            /*
             * Now use new_p16 as the key to see if the old
             * password matches.
             */
            D_P16(new_p16, lmhash, unenc_old_pw);

            if (memcmp(lanman_pw, unenc_old_pw, 16)) {
                  DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
                  pdb_free_sam(sampass);
                  return False;
            }

#ifdef DEBUG_PASSWORD
            DEBUG(100,
                  ("check_oem_password: password %s ok\n", new_passwd));
#endif
            *hnd = sampass;
            return True;
      }

      /*
       * Now use new_p16 as the key to see if the old
       * password matches.
       */
      D_P16(new_ntp16, lmhash, unenc_old_pw);
      D_P16(new_ntp16, nthash, unenc_old_ntpw);

      if (memcmp(lanman_pw, unenc_old_pw, 16)) {
            DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
            pdb_free_sam(sampass);
            return False;
      }

      if (memcmp(nt_pw, unenc_old_ntpw, 16)) {
            DEBUG(0,("check_oem_password: old nt password doesn't match.\n"));
            pdb_free_sam(sampass);
            return False;
      }
#ifdef DEBUG_PASSWORD
      DEBUG(100, ("check_oem_password: password %s ok\n", new_passwd));
#endif
      *hnd = sampass;
      return True;
}

/***********************************************************
 Code to change the oem password. Changes both the lanman
 and NT hashes.
 override = False, normal
 override = True, override XXXXXXXXXX'd password
************************************************************/

BOOL change_oem_password(SAM_ACCOUNT *hnd, char *new_passwd,
                   BOOL override)
{
      BOOL ret;
      uchar new_nt_p16[16];
      uchar new_p16[16];

      nt_lm_owf_gen(new_passwd, new_nt_p16, new_p16);

      if (!pdb_set_lanman_passwd (hnd, new_p16))
            return False;
      if (!pdb_set_nt_passwd(hnd, new_nt_p16))
            return False;

      /* Now write it into the file. */
      become_root();
      ret = pdb_update_sam_account (hnd, override);
      unbecome_root();

      memset(new_passwd, '\0', strlen(new_passwd));

      return ret;
}

/***********************************************************
 Code to check a plaintext password against smbpasswd entries.
***********************************************************/

BOOL check_plaintext_password(char *user, char *old_passwd,
                        int old_passwd_size, SAM_ACCOUNT **hnd)
{
      SAM_ACCOUNT  *sampass = NULL;
      uchar old_pw[16], old_ntpw[16];
      BOOL ret;

      *hnd = NULL;

      pdb_init_sam(&sampass);

      become_root();
      ret = pdb_getsampwnam(sampass, user);
      unbecome_root();

      if (ret == False) {
            DEBUG(0,("check_plaintext_password: getsmbpwnam returned NULL\n"));
            pdb_free_sam(sampass);
            return False;
      }

      if (pdb_get_acct_ctrl(sampass) & ACB_DISABLED) {
            DEBUG(0,("check_plaintext_password: account %s disabled.\n", user));
            pdb_free_sam(sampass);
            return (False);
      }

      nt_lm_owf_gen(old_passwd, old_ntpw, old_pw);

#ifdef DEBUG_PASSWORD
      DEBUG(100, ("check_plaintext_password: nt_passwd \n"));
      dump_data(100, pdb_get_nt_passwd(sampass), 16);
      DEBUG(100, ("check_plaintext_password: old_ntpw \n"));
      dump_data(100, old_ntpw, 16);
      DEBUG(100, ("check_plaintext_password: lanman_passwd \n"));
      dump_data(100, pdb_get_lanman_passwd(sampass), 16);
      DEBUG(100, ("check_plaintext_password: old_pw\n"));
      dump_data(100, old_pw, 16);
#endif

      if (memcmp(pdb_get_nt_passwd(sampass), old_ntpw, 16)
          && memcmp(pdb_get_lanman_passwd(sampass), old_pw, 16)) {
            pdb_free_sam(sampass);
            return (False);
      } else {
            *hnd = sampass;
            return (True);
      }
}

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