/*
- Unix SMB/Netbios implementation.
- Version 1.9.
+ 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
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.
* 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
extern struct passdb_ops pdb_ops;
-static 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 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
int master;
static fstring line;
DIR *dirp;
- char *dpname;
+ const char *dpname;
#if defined(HAVE_GRANTPT)
/* Try to open /dev/ptmx. If that fails, fall through to old method. */
return (-1);
}
-static int dochild(int master, char *slavedev, char *name,
- char *passwordprogram, BOOL as_root)
+static int dochild(int master, const char *slavedev, const struct passwd *pass,
+ const 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));
+ ("dochild: user doesn't exist in the UNIX password database.\n"));
return False;
}
/* Make slave stdin/out/err of child. */
- if (dup2(slave, STDIN_FILENO) != STDIN_FILENO)
+ if (sys_dup2(slave, STDIN_FILENO) != STDIN_FILENO)
{
DEBUG(3, ("Could not re-direct stdin\n"));
return (False);
}
- if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
+ if (sys_dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
{
DEBUG(3, ("Could not re-direct stdout\n"));
return (False);
}
- if (dup2(slave, STDERR_FILENO) != STDERR_FILENO)
+ if (sys_dup2(slave, STDERR_FILENO) != STDERR_FILENO)
{
DEBUG(3, ("Could not re-direct stderr\n"));
return (False);
}
stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
stermios.c_lflag |= ICANON;
- stermios.c_oflag &= ~(ONLCR);
+#ifdef ONLCR
+ stermios.c_oflag &= ~(ONLCR);
+#endif
if (tcsetattr(0, TCSANOW, &stermios) < 0)
{
DEBUG(3, ("could not set attributes of pty\n"));
int attempts, timeout, nread, len;
BOOL match = False;
- for (attempts = 0; attempts < 2; attempts++)
- {
- if (!strequal(issue, "."))
- {
+ for (attempts = 0; attempts < 2; attempts++) {
+ if (!strequal(issue, ".")) {
if (lp_passwd_chat_debug())
DEBUG(100, ("expect: sending [%s]\n", issue));
- write(master, issue, strlen(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;
+ /* Initial timeout. */
+ timeout = lp_passwd_chat_timeout() * 1000;
nread = 0;
buffer[nread] = 0;
- while ((len = read_with_timeout(master, buffer + nread, 1,
- sizeof(buffer) - nread - 1,
- timeout)) > 0)
- {
+ while ((len = read_socket_with_timeout(master, buffer + nread, 1,
+ sizeof(buffer) - nread - 1,
+ timeout)) > 0) {
nread += len;
buffer[nread] = 0;
- if ((match = (wild_match(expected, buffer) == 0)))
- timeout = 200;
+ {
+ /* Eat leading/trailing whitespace before match. */
+ pstring str;
+ pstrcpy( str, buffer);
+ trim_char( str, ' ', ' ');
+
+ if ((match = (unix_wild_match(expected, str) == 0))) {
+ /* 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]\n",
- expected, buffer));
+ DEBUG(100, ("expect: expected [%s] received [%s] match %s\n",
+ expected, buffer, match ? "yes" : "no" ));
if (match)
break;
- if (len < 0)
- {
+ if (len < 0) {
DEBUG(2, ("expect: %s\n", strerror(errno)));
return False;
}
}
+ DEBUG(10,("expect: returning %s\n", match ? "True" : "False" ));
return match;
}
all_string_sub(buf, "\\t", "\t", 0);
}
-static int talktochild(int master, char *seq)
+static int talktochild(int master, const char *seq)
{
int count = 0;
fstring issue, expected;
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,
+static BOOL chat_with_program(char *passwordprogram, const struct passwd *pass,
char *chatsequence, BOOL as_root)
{
char *slavedev;
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,
- ("Cannot Allocate pty for password change: %s\n",
- name));
+ if ((master = findpty(&slavedev)) < 0) {
+ DEBUG(3, ("chat_with_program: Cannot Allocate pty for password change: %s\n", pass->pw_name));
return (False);
}
CatchChildLeaveStatus();
- if ((pid = sys_fork()) < 0)
- {
- DEBUG(3,
- ("Cannot fork() child for password change: %s\n",
- name));
+ 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,
- ("Child failed to change password: %s\n",
- name));
+ 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)
- {
+ 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"));
+ if (wpid < 0) {
+ DEBUG(3, ("chat_with_program: The process is no longer waiting!\n\n"));
close(master);
CatchChild();
return (False);
close(master);
- if (pid != wpid)
- {
- DEBUG(3,
- ("We were waiting for the wrong process ID\n"));
+ if (pid != wpid) {
+ DEBUG(3, ("chat_with_program: 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"));
+ 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 (WEXITSTATUS(wstat) != 0)
- {
- DEBUG(3,
- ("The status of the process exiting was %d\n",
- wstat));
+#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);
}
-
- }
- else
- {
+#endif
+ } else {
/* CHILD */
/*
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);
+ 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));
+ 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));
+ DEBUG(3, ("chat_with_program: Password change %ssuccessful for user %s\n",
+ (chstat ? "" : "un"), pass->pw_name));
return (chstat);
}
-
-BOOL chgpasswd(char *name, char *oldpass, char *newpass, BOOL as_root)
+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;
- strlower(name);
- DEBUG(3, ("Password change for user: %s\n", name));
+ if (!oldpass) {
+ oldpass = "";
+ }
+
+ DEBUG(3, ("chgpasswd: Password change (as_root=%s) for user: %s\n", BOOLSTR(as_root), name));
#if DEBUG_PASSWORD
- DEBUG(100, ("Passwords: old=%s new=%s\n", oldpass, newpass));
+ DEBUG(100, ("chgpasswd: 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 */
+ DEBUG(2, ("chgpasswd: Password Change: %s, New password is same as old\n", name)); /* log the attempt */
return (False); /* inform the user */
}
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"));
+ 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,
- ("chat_with_program: newpass contains control characters (disallowed).\n"));
+ 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();
- ret = smb_pam_passchange(name, oldpass, newpass);
-
+ if (pass) {
+ ret = smb_pam_passchange(pass->pw_name, oldpass, newpass);
+ } else {
+ ret = smb_pam_passchange(name, oldpass, newpass);
+ }
+
if (as_root)
unbecome_root();
}
#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, ("Null chat sequence - no password changing\n"));
+ DEBUG(2, ("chgpasswd: Null chat sequence - no password changing\n"));
return (False);
}
if (!*passwordprogram) {
- DEBUG(2, ("Null password program - no password changing\n"));
+ 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
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));
+ (passwordprogram, pass, chatsequence, as_root));
}
#else /* ALLOW_CHANGE_PASSWORD */
-BOOL chgpasswd(char *name, char *oldpass, char *newpass, BOOL as_root)
+BOOL chgpasswd(const char *name, const struct passwd *pass,
+ const char *oldpass, const char *newpass, BOOL as_root)
{
- DEBUG(0, ("Password changing not compiled in (user=%s)\n", name));
+ DEBUG(0, ("chgpasswd: Unix Password changing not compiled in (user=%s)\n", name));
return (False);
}
#endif /* ALLOW_CHANGE_PASSWORD */
uchar unenc_old_pw[16];
SAM_ACCOUNT *sampass = NULL;
uint16 acct_ctrl;
- uint8 *lanman_pw;
+ const uint8 *lanman_pw;
BOOL ret;
become_root();
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 * pass1,
- uchar * pass2)
+BOOL change_lanman_password(SAM_ACCOUNT *sampass, uchar *pass2)
{
static uchar null_pw[16];
uchar unenc_new_pw[16];
BOOL ret;
uint16 acct_ctrl;
- uint8 *pwd;
+ const uint8 *pwd;
if (sampass == NULL) {
DEBUG(0,("change_lanman_password: no smb password entry.\n"));
D_P16(pwd, pass2, unenc_new_pw);
}
- if (!pdb_set_lanman_passwd(sampass, unenc_new_pw)) {
+ if (!pdb_set_lanman_passwd(sampass, unenc_new_pw, PDB_CHANGED)) {
return False;
}
- if (!pdb_set_nt_passwd (sampass, NULL)) {
+ 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 */
- become_root();
- ret = pdb_update_sam_account (sampass, False);
- unbecome_root();
+ ret = pdb_update_sam_account (sampass);
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)
+
+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])
{
- fstring new_passwd;
+ pstring 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);
+ 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;
- if (ret)
- ret = change_oem_password(sampass, new_passwd);
+ /* 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 ret;
+ return nt_status;
}
/***********************************************************
- Code to check the OEM hashed password.
+ Decrypt and verify a user password change.
- this function ignores the 516 byte nt OEM hashed password
- but does use the lm OEM password to check the nt hashed-hash.
+ 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 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 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 *lanman_pw, *nt_pw;
+ char *password_encrypted;
+ const char *encryption_key;
+ const 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];
+ uint32 new_pw_len;
+ uchar new_nt_hash[16];
+ uchar old_nt_hash_plain[16];
+ uchar new_lm_hash[16];
+ uchar old_lm_hash_plain[16];
char no_pw[2];
BOOL ret;
- BOOL nt_pass_set = (ntdata != NULL && nthash != NULL);
+ 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);
if (ret == False) {
DEBUG(0, ("check_oem_password: getsmbpwnam returned NULL\n"));
- return False;
+ pdb_free_sam(&sampass);
+ return NT_STATUS_NO_SUCH_USER;
}
- *hnd = sampass;
-
acct_ctrl = pdb_get_acct_ctrl(sampass);
if (acct_ctrl & ACB_DISABLED) {
- DEBUG(0,("check_lanman_password: account %s disabled.\n", user));
- return False;
+ DEBUG(2,("check_lanman_password: account %s disabled.\n", user));
+ pdb_free_sam(&sampass);
+ return NT_STATUS_ACCOUNT_DISABLED;
}
- /* 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);
+ 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;
- /* check for null passwords */
- if (lanman_pw == NULL) {
- if (!(acct_ctrl & ACB_PWNOTREQ)) {
- DEBUG(0,("check_oem_password: no lanman password !\n"));
- return False;
+ } 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 (pdb_get_nt_passwd(sampass) == NULL && nt_pass_set) {
- if (!(acct_ctrl & ACB_PWNOTREQ)) {
- DEBUG(0,("check_oem_password: no ntlm password !\n"));
- return False;
- }
+
+ 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) {
+ DEBUG(1, ("LM password change supplied for user %s, but we have no LanMan password to check it with\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;
}
-
- /*
- * 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.
+ * Decrypt the password with the key
*/
+ SamOEMhash( password_encrypted, encryption_key, 516);
- 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));
- return False;
- }
-
- if (nt_pass_set) {
- /*
- * nt passwords are in unicode
- */
- pull_ucs2(NULL, new_passwd,
- (const smb_ucs2_t *)&lmdata[512 - new_pw_len],
- new_passwd_size, new_pw_len, 0);
- } else {
- memcpy(new_passwd, &lmdata[512 - new_pw_len], new_pw_len);
- new_passwd[new_pw_len] = 0;
+ 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;
}
/*
* 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) {
+ /* 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) {
+ /*
+ * Now use new_nt_hash as the key to see if the old
+ * password matches.
+ */
+ D_P16(new_nt_hash, old_nt_hash_encrypted, old_nt_hash_plain);
+
+ if (memcmp(nt_pw, old_nt_hash_plain, 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) {
+ /*
+ * Now use new_nt_hash as the key to see if the old
+ * LM password matches.
+ */
+ D_P16(new_nt_hash, old_lm_hash_encrypted, old_lm_hash_plain);
+
+ if (memcmp(lanman_pw, old_lm_hash_plain, 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);
- if (!nt_pass_set)
- {
/*
- * Now use new_p16 as the key to see if the old
+ * Now use new_lm_hash 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))
- {
+ D_P16(new_lm_hash, old_lm_hash_encrypted, old_lm_hash_plain);
+
+ if (memcmp(lanman_pw, old_lm_hash_plain, 16)) {
DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
- return False;
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
}
-
+
#ifdef DEBUG_PASSWORD
DEBUG(100,
("check_oem_password: password %s ok\n", new_passwd));
#endif
- return True;
+ *hnd = sampass;
+ return NT_STATUS_OK;
}
- /*
- * 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);
+ /* should not be reached */
+ pdb_free_sam(&sampass);
+ return NT_STATUS_WRONG_PASSWORD;
+}
- if (memcmp(lanman_pw, unenc_old_pw, 16))
- {
- DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
+/***********************************************************
+ 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, pwHisLen, curr_pwHisLen;
+
+ account_policy_get(AP_PASSWORD_HISTORY, &pwHisLen);
+ if (pwHisLen == 0) {
return False;
}
- if (memcmp(nt_pw, unenc_old_ntpw, 16))
- {
- DEBUG(0,("check_oem_password: old nt password doesn't match.\n"));
+ pwhistory = pdb_get_pw_history(sampass, &curr_pwHisLen);
+ if (!pwhistory || curr_pwHisLen == 0) {
return False;
}
-#ifdef DEBUG_PASSWORD
- DEBUG(100, ("check_oem_password: password %s ok\n", new_passwd));
-#endif
- return True;
-}
-/***********************************************************
- Code to change the oem password. Changes both the lanman
- and NT hashes.
-************************************************************/
+ /* Only examine the minimum of the current history len and
+ the stored history len. Avoids race conditions. */
+ pwHisLen = MIN(pwHisLen,curr_pwHisLen);
-BOOL change_oem_password(SAM_ACCOUNT *hnd, char *new_passwd)
-{
- BOOL ret;
+ nt_pw = pdb_get_nt_passwd(sampass);
- if (!pdb_set_plaintext_passwd (hnd, new_passwd)) {
- return False;
+ 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;
}
- /* Now write it into the file. */
- become_root();
- ret = pdb_update_sam_account (hnd, False);
- unbecome_root();
+ dump_data(100, new_nt_p16, NT_HASH_LEN);
+ dump_data(100, 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);
- return ret;
+ 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 check a plaintext password against smbpasswd entries.
-***********************************************************/
+ 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.
+************************************************************/
-BOOL check_plaintext_password(char *user, char *old_passwd,
- int old_passwd_size, SAM_ACCOUNT **hnd)
+NTSTATUS change_oem_password(SAM_ACCOUNT *hnd, char *old_passwd, char *new_passwd, BOOL as_root)
{
- SAM_ACCOUNT *sampass = NULL;
- uchar old_pw[16], old_ntpw[16];
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;
+ }
- pdb_init_sam(&sampass);
+ if (account_policy_get(AP_MIN_PASSWORD_LEN, &min_len) && (strlen(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; */
+ }
- become_root();
- ret = pdb_getsampwnam(sampass, user);
- unbecome_root();
+ /* Take the passed information and test it for minimum criteria */
+ /* Minimum password length */
+ if (strlen(new_passwd) < lp_min_passwd_length()) {
+ /* too short, must be at least MINPASSWDLENGTH */
+ DEBUG(1, ("Password Change: user %s, New password is shorter than minimum password length = %d\n",
+ username, lp_min_passwd_length()));
+ return NT_STATUS_PASSWORD_RESTRICTION;
+/* return NT_STATUS_PWD_TOO_SHORT; */
+ }
- *hnd = sampass;
+ if (check_passwd_history(hnd,new_passwd)) {
+ return NT_STATUS_PASSWORD_RESTRICTION;
+ }
- if (ret == False)
- {
- DEBUG(0,("check_plaintext_password: getsmbpwnam returned NULL\n"));
- return False;
+ 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;
}
- if (pdb_get_acct_ctrl(sampass) & ACB_DISABLED)
- {
- DEBUG(0,("check_plaintext_password: account %s disabled.\n", user));
- return (False);
+ /* Use external script to check password complexity */
+ if (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;
}
- nt_lm_owf_gen(old_passwd, old_ntpw, old_pw);
+ if (!pdb_set_plaintext_passwd (hnd, new_passwd)) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
-#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
+ /* Now write it into the file. */
+ ret = pdb_update_sam_account (hnd);
- if (memcmp(pdb_get_nt_passwd(sampass), old_ntpw, 16)
- && memcmp(pdb_get_lanman_passwd(sampass), old_pw, 16))
- return (False);
- else
- return (True);
+ if (!ret) {
+ return NT_STATUS_ACCESS_DENIED;
+ }
+
+ return NT_STATUS_OK;
}
git.samba.org / sfrench / samba-autobuild / .git / blobdiff