--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ Samba utility functions
+ Copyright (C) Andrew Tridgell 1992-1998
+ Copyright (C) Andrew Bartlett 2001-2004
+
+ 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.
+*/
+
+/* These comments regard the code to change the user's unix password: */
+
+/* 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 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"
+
+extern struct passdb_ops pdb_ops;
+
+static NTSTATUS check_oem_password(const char *user,
+ uchar password_encrypted_with_lm_hash[516],
+ const uchar old_lm_hash_encrypted[16],
+ uchar password_encrypted_with_nt_hash[516],
+ const uchar old_nt_hash_encrypted[16],
+ SAM_ACCOUNT **hnd, char *new_passwd,
+ int new_passwd_size);
+
+#if ALLOW_CHANGE_PASSWORD
+
+static int findpty(char **slave)
+{
+ int master;
+ static fstring line;
+ SMB_STRUCT_DIR *dirp;
+ const 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 = sys_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;
+ sys_closedir(dirp);
+ return (master);
+ }
+ }
+ }
+ sys_closedir(dirp);
+ return (-1);
+}
+
+static int dochild(int master, const char *slavedev, const struct passwd *pass,
+ const char *passwordprogram, BOOL as_root)
+{
+ int slave;
+ struct termios stermios;
+ gid_t gid;
+ uid_t uid;
+
+ if (pass == NULL)
+ {
+ DEBUG(0,
+ ("dochild: user doesn't exist in the UNIX password database.\n"));
+ 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);
+ }
+#if defined(I_PUSH) && defined(I_FIND)
+ if (ioctl(slave, I_FIND, "ptem") == 0) {
+ ioctl(slave, I_PUSH, "ptem");
+ }
+ if (ioctl(slave, I_FIND, "ldterm") == 0) {
+ 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 (sys_dup2(slave, STDIN_FILENO) != STDIN_FILENO)
+ {
+ DEBUG(3, ("Could not re-direct stdin\n"));
+ return (False);
+ }
+ if (sys_dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
+ {
+ DEBUG(3, ("Could not re-direct stdout\n"));
+ return (False);
+ }
+ if (sys_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;
+
+ /* Initial timeout. */
+ timeout = lp_passwd_chat_timeout() * 1000;
+ nread = 0;
+ buffer[nread] = 0;
+
+ while ((len = read_socket_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;
+ pstrcpy( str, buffer);
+ trim_char( str, ' ', ' ');
+
+ if ((match = unix_wild_match(expected, str)) == True) {
+ /* Now data has started to return, lower timeout. */
+ timeout = lp_passwd_chat_timeout() * 100;
+ }
+ }
+ }
+
+ 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, const struct passwd *pass,
+ char *chatsequence, BOOL as_root)
+{
+ char *slavedev;
+ int master;
+ pid_t pid, wpid;
+ int wstat;
+ BOOL chstat = False;
+
+ if (pass == NULL) {
+ DEBUG(0, ("chat_with_program: user doesn't exist in the UNIX password database.\n"));
+ return False;
+ }
+
+ /* allocate a pseudo-terminal device */
+ if ((master = findpty(&slavedev)) < 0) {
+ DEBUG(3, ("chat_with_program: Cannot Allocate pty for password change: %s\n", pass->pw_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, ("chat_with_program: Cannot fork() child for password change: %s\n", pass->pw_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, ("chat_with_program: Child failed to change password: %s\n", pass->pw_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, ("chat_with_program: 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, ("chat_with_program: We were waiting for the wrong process ID\n"));
+ return (False);
+ }
+ if (WIFEXITED(wstat) && (WEXITSTATUS(wstat) != 0)) {
+ DEBUG(3, ("chat_with_program: The process exited with status %d \
+while we were waiting\n", WEXITSTATUS(wstat)));
+ return (False);
+ }
+#if defined(WIFSIGNALLED) && defined(WTERMSIG)
+ else if (WIFSIGNALLED(wstat)) {
+ DEBUG(3, ("chat_with_program: The process was killed by signal %d \
+while we were waiting\n", WTERMSIG(wstat)));
+ return (False);
+ }
+#endif
+ } 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, ("chat_with_program: Dochild for user %s (uid=%d,gid=%d) (as_root = %s)\n", pass->pw_name,
+ (int)getuid(), (int)getgid(), BOOLSTR(as_root) ));
+ chstat = dochild(master, slavedev, pass, 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, ("chat_with_program: Password change %ssuccessful for user %s\n",
+ (chstat ? "" : "un"), pass->pw_name));
+ return (chstat);
+}
+
+BOOL chgpasswd(const char *name, const struct passwd *pass,
+ const char *oldpass, const char *newpass, BOOL as_root)
+{
+ pstring passwordprogram;
+ pstring chatsequence;
+ size_t i;
+ size_t len;
+
+ if (!oldpass) {
+ oldpass = "";
+ }
+
+ DEBUG(3, ("chgpasswd: Password change (as_root=%s) for user: %s\n", BOOLSTR(as_root), name));
+
+#ifdef DEBUG_PASSWORD
+ DEBUG(100, ("chgpasswd: Passwords: old=%s new=%s\n", oldpass, newpass));
+#endif
+
+ /* Take the passed information and test it for minimum criteria */
+
+ /* Password is same as old password */
+ if (strcmp(oldpass, newpass) == 0) {
+ /* don't allow same password */
+ DEBUG(2, ("chgpasswd: 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, ("chgpasswd: oldpass contains control characters (disallowed).\n"));
+ return False;
+ }
+ }
+
+ len = strlen(newpass);
+ for (i = 0; i < len; i++) {
+ if (iscntrl((int)newpass[i])) {
+ DEBUG(0, ("chgpasswd: newpass contains control characters (disallowed).\n"));
+ return False;
+ }
+ }
+
+#ifdef WITH_PAM
+ if (lp_pam_password_change()) {
+ BOOL ret;
+
+ if (as_root)
+ become_root();
+
+ if (pass) {
+ ret = smb_pam_passchange(pass->pw_name, oldpass, newpass);
+ } else {
+ ret = smb_pam_passchange(name, oldpass, newpass);
+ }
+
+ if (as_root)
+ unbecome_root();
+
+ return ret;
+ }
+#endif
+
+ /* A non-PAM password change just doen't make sense without a valid local user */
+
+ if (pass == NULL) {
+ DEBUG(0, ("chgpasswd: user %s doesn't exist in the UNIX password database.\n", name));
+ return False;
+ }
+
+ 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_m(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);
+ /* 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);
+ all_string_sub(chatsequence, "%o", oldpass, sizeof(pstring));
+ all_string_sub(chatsequence, "%n", newpass, sizeof(pstring));
+ return (chat_with_program
+ (passwordprogram, pass, chatsequence, as_root));
+}
+
+#else /* ALLOW_CHANGE_PASSWORD */
+
+BOOL chgpasswd(const char *name, const struct passwd *pass,
+ const char *oldpass, const char *newpass, BOOL as_root)
+{
+ DEBUG(0, ("chgpasswd: Unix 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)
+{
+ uchar unenc_new_pw[16];
+ uchar unenc_old_pw[16];
+ SAM_ACCOUNT *sampass = NULL;
+ uint16 acct_ctrl;
+ const 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) {
+ if (acct_ctrl & ACB_PWNOTREQ) {
+ /* this saves the pointer for the caller */
+ *hnd = sampass;
+ return True;
+ } else {
+ 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.
+ NOTE this function is designed to be called as root. Check the old password
+ is correct before calling. JRA.
+************************************************************/
+
+BOOL change_lanman_password(SAM_ACCOUNT *sampass, uchar *pass2)
+{
+ static uchar null_pw[16];
+ uchar unenc_new_pw[16];
+ BOOL ret;
+ uint16 acct_ctrl;
+ const 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) {
+ if (acct_ctrl & ACB_PWNOTREQ) {
+ uchar no_pw[14];
+ memset(no_pw, '\0', 14);
+ E_P16(no_pw, null_pw);
+
+ /* Get the new lanman hash. */
+ D_P16(null_pw, pass2, unenc_new_pw);
+ } else {
+ DEBUG(0,("change_lanman_password: no lanman password !\n"));
+ return False;
+ }
+ } else {
+ /* Get the new lanman hash. */
+ D_P16(pwd, pass2, unenc_new_pw);
+ }
+
+ if (!pdb_set_lanman_passwd(sampass, unenc_new_pw, PDB_CHANGED)) {
+ return False;
+ }
+
+ if (!pdb_set_nt_passwd (sampass, NULL, PDB_CHANGED)) {
+ return False; /* We lose the NT hash. Sorry. */
+ }
+
+ if (!pdb_set_pass_changed_now (sampass)) {
+ pdb_free_sam(&sampass);
+ /* Not quite sure what this one qualifies as, but this will do */
+ return False;
+ }
+
+ /* Now flush the sam_passwd struct to persistent storage */
+ ret = pdb_update_sam_account (sampass);
+
+ return ret;
+}
+
+/***********************************************************
+ Code to check and change the OEM hashed password.
+************************************************************/
+
+NTSTATUS pass_oem_change(char *user,
+ uchar password_encrypted_with_lm_hash[516],
+ const uchar old_lm_hash_encrypted[16],
+ uchar password_encrypted_with_nt_hash[516],
+ const uchar old_nt_hash_encrypted[16])
+{
+ pstring new_passwd;
+ SAM_ACCOUNT *sampass = NULL;
+ NTSTATUS nt_status = check_oem_password(user, password_encrypted_with_lm_hash,
+ old_lm_hash_encrypted,
+ password_encrypted_with_nt_hash,
+ old_nt_hash_encrypted,
+ &sampass, new_passwd, sizeof(new_passwd));
+
+ if (!NT_STATUS_IS_OK(nt_status))
+ return nt_status;
+
+ /* We've already checked the old password here.... */
+ become_root();
+ nt_status = change_oem_password(sampass, NULL, new_passwd, True);
+ unbecome_root();
+
+ memset(new_passwd, 0, sizeof(new_passwd));
+
+ pdb_free_sam(&sampass);
+
+ return nt_status;
+}
+
+/***********************************************************
+ Decrypt and verify a user password change.
+
+ The 516 byte long buffers are encrypted with the old NT and
+ old LM passwords, and if the NT passwords are present, both
+ buffers contain a unicode string.
+
+ After decrypting the buffers, check the password is correct by
+ matching the old hashed passwords with the passwords in the passdb.
+
+************************************************************/
+
+static NTSTATUS check_oem_password(const char *user,
+ uchar password_encrypted_with_lm_hash[516],
+ const uchar old_lm_hash_encrypted[16],
+ uchar password_encrypted_with_nt_hash[516],
+ const uchar old_nt_hash_encrypted[16],
+ 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 *password_encrypted;
+ const uint8 *encryption_key;
+ const uint8 *lanman_pw, *nt_pw;
+ uint16 acct_ctrl;
+ uint32 new_pw_len;
+ uchar new_nt_hash[16];
+ uchar new_lm_hash[16];
+ uchar verifier[16];
+ char no_pw[2];
+ BOOL ret;
+
+ BOOL nt_pass_set = (password_encrypted_with_nt_hash && old_nt_hash_encrypted);
+ BOOL lm_pass_set = (password_encrypted_with_lm_hash && old_lm_hash_encrypted);
+
+ *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 NT_STATUS_NO_SUCH_USER;
+ }
+
+ acct_ctrl = pdb_get_acct_ctrl(sampass);
+
+ if (acct_ctrl & ACB_DISABLED) {
+ DEBUG(2,("check_lanman_password: account %s disabled.\n", user));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_ACCOUNT_DISABLED;
+ }
+
+ if ((acct_ctrl & ACB_PWNOTREQ) && lp_null_passwords()) {
+ /* 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);
+ lanman_pw = null_pw;
+ nt_pw = null_pw;
+
+ } else {
+ /* save pointers to passwords so we don't have to keep looking them up */
+ if (lp_lanman_auth()) {
+ lanman_pw = pdb_get_lanman_passwd(sampass);
+ } else {
+ lanman_pw = NULL;
+ }
+ nt_pw = pdb_get_nt_passwd(sampass);
+ }
+
+ if (nt_pw && nt_pass_set) {
+ /* IDEAL Case: passwords are in unicode, and we can
+ * read use the password encrypted with the NT hash
+ */
+ password_encrypted = password_encrypted_with_nt_hash;
+ encryption_key = nt_pw;
+ } else if (lanman_pw && lm_pass_set) {
+ /* password may still be in unicode, but use LM hash version */
+ password_encrypted = password_encrypted_with_lm_hash;
+ encryption_key = lanman_pw;
+ } else if (nt_pass_set) {
+ DEBUG(1, ("NT password change supplied for user %s, but we have no NT password to check it with\n",
+ user));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ } else if (lm_pass_set) {
+ if (lp_lanman_auth()) {
+ DEBUG(1, ("LM password change supplied for user %s, but we have no LanMan password to check it with\n",
+ user));
+ } else {
+ DEBUG(1, ("LM password change supplied for user %s, but we have disabled LanMan authentication\n",
+ user));
+ }
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ } else {
+ DEBUG(1, ("password change requested for user %s, but no password supplied!\n",
+ user));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ /*
+ * Decrypt the password with the key
+ */
+ SamOEMhash( password_encrypted, encryption_key, 516);
+
+ if ( !decode_pw_buffer(password_encrypted, new_passwd, new_passwd_size, &new_pw_len,
+ nt_pass_set ? STR_UNICODE : STR_ASCII)) {
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ /*
+ * To ensure we got the correct new password, hash it and
+ * use it as a key to test the passed old password.
+ */
+
+ if (nt_pass_set) {
+ /* NT passwords, verify the NT hash. */
+
+ /* Calculate the MD4 hash (NT compatible) of the password */
+ memset(new_nt_hash, '\0', 16);
+ E_md4hash(new_passwd, new_nt_hash);
+
+ if (nt_pw) {
+ /*
+ * check the NT verifier
+ */
+ E_old_pw_hash(new_nt_hash, nt_pw, verifier);
+ if (memcmp(verifier, old_nt_hash_encrypted, 16)) {
+ DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+ /* We could check the LM password here, but there is
+ * little point, we already know the password is
+ * correct, and the LM password might not even be
+ * present. */
+
+ /* Further, LM hash generation algorithms
+ * differ with charset, so we could
+ * incorrectly fail a perfectly valid password
+ * change */
+#ifdef DEBUG_PASSWORD
+ DEBUG(100,
+ ("check_oem_password: password %s ok\n", new_passwd));
+#endif
+ *hnd = sampass;
+ return NT_STATUS_OK;
+ }
+
+ if (lanman_pw) {
+ /*
+ * check the lm verifier
+ */
+ E_old_pw_hash(new_nt_hash, lanman_pw, verifier);
+ if (memcmp(verifier, old_lm_hash_encrypted, 16)) {
+ DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+#ifdef DEBUG_PASSWORD
+ DEBUG(100,
+ ("check_oem_password: password %s ok\n", new_passwd));
+#endif
+ *hnd = sampass;
+ return NT_STATUS_OK;
+ }
+ }
+
+ if (lanman_pw && lm_pass_set) {
+
+ E_deshash(new_passwd, new_lm_hash);
+
+ /*
+ * check the lm verifier
+ */
+ E_old_pw_hash(new_lm_hash, lanman_pw, verifier);
+ if (memcmp(verifier, old_lm_hash_encrypted, 16)) {
+ DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+ }
+
+#ifdef DEBUG_PASSWORD
+ DEBUG(100,
+ ("check_oem_password: password %s ok\n", new_passwd));
+#endif
+ *hnd = sampass;
+ return NT_STATUS_OK;
+ }
+
+ /* should not be reached */
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+}
+
+/***********************************************************
+ This routine takes the given password and checks it against
+ the password history. Returns True if this password has been
+ found in the history list.
+************************************************************/
+
+static BOOL check_passwd_history(SAM_ACCOUNT *sampass, const char *plaintext)
+{
+ uchar new_nt_p16[NT_HASH_LEN];
+ uchar zero_md5_nt_pw[SALTED_MD5_HASH_LEN];
+ const uint8 *nt_pw;
+ const uint8 *pwhistory;
+ BOOL found = False;
+ int i;
+ uint32 pwHisLen, curr_pwHisLen;
+
+ pdb_get_account_policy(AP_PASSWORD_HISTORY, &pwHisLen);
+ if (pwHisLen == 0) {
+ return False;
+ }
+
+ pwhistory = pdb_get_pw_history(sampass, &curr_pwHisLen);
+ if (!pwhistory || curr_pwHisLen == 0) {
+ return False;
+ }
+
+ /* Only examine the minimum of the current history len and
+ the stored history len. Avoids race conditions. */
+ pwHisLen = MIN(pwHisLen,curr_pwHisLen);
+
+ nt_pw = pdb_get_nt_passwd(sampass);
+
+ E_md4hash(plaintext, new_nt_p16);
+
+ if (!memcmp(nt_pw, new_nt_p16, NT_HASH_LEN)) {
+ DEBUG(10,("check_passwd_history: proposed new password for user %s is the same as the current password !\n",
+ pdb_get_username(sampass) ));
+ return True;
+ }
+
+ dump_data(100, (const char *)new_nt_p16, NT_HASH_LEN);
+ dump_data(100, (const char *)pwhistory, PW_HISTORY_ENTRY_LEN*pwHisLen);
+
+ memset(zero_md5_nt_pw, '\0', SALTED_MD5_HASH_LEN);
+ for (i=0; i<pwHisLen; i++) {
+ uchar new_nt_pw_salted_md5_hash[SALTED_MD5_HASH_LEN];
+ const uchar *current_salt = &pwhistory[i*PW_HISTORY_ENTRY_LEN];
+ const uchar *old_nt_pw_salted_md5_hash = &pwhistory[(i*PW_HISTORY_ENTRY_LEN)+
+ PW_HISTORY_SALT_LEN];
+ if (!memcmp(zero_md5_nt_pw, old_nt_pw_salted_md5_hash, SALTED_MD5_HASH_LEN)) {
+ /* Ignore zero valued entries. */
+ continue;
+ }
+ /* Create salted versions of new to compare. */
+ E_md5hash(current_salt, new_nt_p16, new_nt_pw_salted_md5_hash);
+
+ if (!memcmp(new_nt_pw_salted_md5_hash, old_nt_pw_salted_md5_hash, SALTED_MD5_HASH_LEN)) {
+ DEBUG(1,("check_passwd_history: proposed new password for user %s found in history list !\n",
+ pdb_get_username(sampass) ));
+ found = True;
+ break;
+ }
+ }
+ return found;
+}
+
+/***********************************************************
+ Code to change the oem password. Changes both the lanman
+ and NT hashes. Old_passwd is almost always NULL.
+ NOTE this function is designed to be called as root. Check the old password
+ is correct before calling. JRA.
+************************************************************/
+
+NTSTATUS change_oem_password(SAM_ACCOUNT *hnd, char *old_passwd, char *new_passwd, BOOL as_root)
+{
+ BOOL ret;
+ uint32 min_len;
+ struct passwd *pass = NULL;
+ const char *username = pdb_get_username(hnd);
+ time_t can_change_time = pdb_get_pass_can_change_time(hnd);
+
+ if ((can_change_time != 0) && (time(NULL) < can_change_time)) {
+ DEBUG(1, ("user %s cannot change password now, must wait until %s\n",
+ username, http_timestring(can_change_time)));
+ return NT_STATUS_ACCOUNT_RESTRICTION;
+ }
+
+ if (pdb_get_account_policy(AP_MIN_PASSWORD_LEN, &min_len) && (str_charnum(new_passwd) < min_len)) {
+ DEBUG(1, ("user %s cannot change password - password too short\n",
+ username));
+ DEBUGADD(1, (" account policy min password len = %d\n", min_len));
+ return NT_STATUS_PASSWORD_RESTRICTION;
+/* return NT_STATUS_PWD_TOO_SHORT; */
+ }
+
+ if (check_passwd_history(hnd,new_passwd)) {
+ return NT_STATUS_PASSWORD_RESTRICTION;
+ }
+
+ pass = Get_Pwnam(username);
+ if (!pass) {
+ DEBUG(1, ("check_oem_password: Username %s does not exist in system !?!\n", username));
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /* Use external script to check password complexity */
+ if (lp_check_password_script() && *(lp_check_password_script())) {
+ int check_ret;
+
+ check_ret = smbrunsecret(lp_check_password_script(), new_passwd);
+ DEBUG(5, ("change_oem_password: check password script (%s) returned [%d]\n", lp_check_password_script(), check_ret));
+
+ if (check_ret != 0) {
+ DEBUG(1, ("change_oem_password: check password script said new password is not good enough!\n"));
+ return NT_STATUS_PASSWORD_RESTRICTION;
+ }
+ }
+
+ /*
+ * If unix password sync was requested, attempt to change
+ * the /etc/passwd database first. Return failure if this cannot
+ * be done.
+ *
+ * This occurs before the oem change, because we don't want to
+ * update it if chgpasswd failed.
+ *
+ * Conditional on lp_unix_password_sync() because we don't want
+ * to touch the unix db unless we have admin permission.
+ */
+
+ if(lp_unix_password_sync() &&
+ !chgpasswd(username, pass, old_passwd, new_passwd, as_root)) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ if (!pdb_set_plaintext_passwd (hnd, new_passwd)) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ /* Now write it into the file. */
+ ret = pdb_update_sam_account (hnd);
+
+ if (!ret) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ return NT_STATUS_OK;
+}
projects / samba / blobdiff