smbd/chgpasswd.c

ソースコードを見る。

関数
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], struct samu **hnd, char *new_passwd, int new_passwd_size)
static int	findpty (char **slave)
static int	dochild (int master, const char *slavedev, const struct passwd *pass, const char *passwordprogram, BOOL as_root)
static int	expect (int master, char *issue, char *expected)
static void	pwd_sub (char *buf)
static int	talktochild (int master, const char *seq)
static BOOL	chat_with_program (char *passwordprogram, const struct passwd *pass, char *chatsequence, BOOL as_root)
BOOL	chgpasswd (const char *name, const struct passwd *pass, const char *oldpass, const char *newpass, BOOL as_root)
BOOL	check_lanman_password (char *user, uchar *pass1, uchar *pass2, struct samu **hnd)
BOOL	change_lanman_password (struct samu *sampass, uchar *pass2)
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], uint32 *reject_reason)
static BOOL	check_passwd_history (struct samu *sampass, const char *plaintext)
NTSTATUS	change_oem_password (struct samu *hnd, char *old_passwd, char *new_passwd, BOOL as_root, uint32 *samr_reject_reason)
変数
passdb_ops	pdb_ops

---

関数

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],
		struct samu **	hnd,
		char *	new_passwd,
		int	new_passwd_size
	)			[static]

chgpasswd.c の 763 行で定義されています。

参照先 samu::acct_ctrl・become_root()・decode_pw_buffer()・E_deshash()・E_md4hash()・E_old_pw_hash()・nt_lm_owf_gen()・samu::nt_pw・pdb_get_acct_ctrl()・pdb_get_lanman_passwd()・pdb_get_nt_passwd()・pdb_getsampwnam()・SamOEMhash()・samu_new()・unbecome_root().

参照元 pass_oem_change().

{
        static uchar null_pw[16];
        static uchar null_ntpw[16];
        struct samu *sampass = NULL;
        uint8 *password_encrypted;
        const uint8 *encryption_key;
        const uint8 *lanman_pw, *nt_pw;
        uint32 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;

        if ( !(sampass = samu_new( NULL )) ) {
                return NT_STATUS_NO_MEMORY;
        }

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

        if (ret == False) {
                DEBUG(0, ("check_oem_password: getsmbpwnam returned NULL\n"));
                TALLOC_FREE(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));
                TALLOC_FREE(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));
                TALLOC_FREE(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));
                }
                TALLOC_FREE(sampass);
                return NT_STATUS_WRONG_PASSWORD;
        } else {
                DEBUG(1, ("password change requested for user %s, but no password supplied!\n", 
                          user));
                TALLOC_FREE(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)) {
                TALLOC_FREE(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"));
                                TALLOC_FREE(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"));
                                TALLOC_FREE(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"));
                        TALLOC_FREE(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 */
        TALLOC_FREE(sampass);
        return NT_STATUS_WRONG_PASSWORD;
}

static int findpty

(

char **

slave

)

[static]

chgpasswd.c の 63 行で定義されています。

参照先 line・readdirname()・sys_closedir()・sys_open()・sys_opendir().

参照元 chat_with_program().

{
        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
	)			[static]

chgpasswd.c の 122 行で定義されています。

参照先 become_user_permanently()・gain_root_privilege()・sys_dup2()・sys_open()・tcgetattr()・tcsetattr().

参照元 chat_with_program().

{
        int slave;
        struct termios stermios;
        gid_t gid;
        uid_t uid;
        char * const eptrs[1] = { NULL };

        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(TIOCSCTTY) && !defined(SUNOS5)
        /*
         * On patched Solaris 10 TIOCSCTTY is defined but seems not to work,
         * see the discussion under
         * https://bugzilla.samba.org/show_bug.cgi?id=5366.
         */
        if (ioctl(slave, TIOCSCTTY, 0) < 0)
        {
                DEBUG(3, ("Error in ioctl call for slave pty\n"));
                /* return(False); */
        }
#elif 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");
        }
#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 (execle("/bin/sh", "sh", "-c", passwordprogram, NULL, eptrs) < 0)
        {
                DEBUG(3, ("Bad status returned from %s\n", passwordprogram));
                return (False);
        }
        return (True);
}

static int expect	(	int	master,
		char *	issue,
		char *	expected
	)			[static]

chgpasswd.c の 239 行で定義されています。

参照先 errno・len・read_socket_with_timeout()・strequal()・strerror()・sys_write()・timeout・trim_char()・unix_wild_match().

参照元 _cleanup_failures()・talktochild().

{
        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 = sys_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

)

[static]

chgpasswd.c の 300 行で定義されています。

参照先 all_string_sub().

{
        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
	)			[static]

chgpasswd.c の 308 行で定義されています。

参照先 expect()・next_token()・pwd_sub()・strequal().

参照元 chat_with_program().

{
        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
	)			[static]

chgpasswd.c の 341 行で定義されています。

参照先 become_root()・CatchChild()・CatchChildLeaveStatus()・DMAPI_ACCESS_CAPABILITY・dochild()・drop_effective_capability()・errno・findpty()・KERNEL_OPLOCK_CAPABILITY・sys_fork()・sys_waitpid()・talktochild()・unbecome_root().

参照元 chgpasswd().

{
        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 elevated privileges.
                 */
                drop_effective_capability(KERNEL_OPLOCK_CAPABILITY);
                drop_effective_capability(DMAPI_ACCESS_CAPABILITY);

                /* 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
	)

chgpasswd.c の 456 行で定義されています。

参照先 all_string_sub()・become_root()・chat_with_program()・len・pstring_sub()・smb_pam_passchange()・strstr_m()・unbecome_root().

参照元 change_oem_password()・set_user_info_23()・set_user_info_pw().

{
        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;
#ifdef HAVE_SETLOCALE
                char *prevlocale = setlocale(LC_ALL, "C");
#endif

                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();

#ifdef HAVE_SETLOCALE
                setlocale(LC_ALL, prevlocale);
#endif

                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));
}

BOOL check_lanman_password	(	char *	user,
		uchar *	pass1,
		uchar *	pass2,
		struct samu **	hnd
	)

chgpasswd.c の 586 行で定義されています。

参照先 samu::acct_ctrl・become_root()・D_P16()・pdb_get_acct_ctrl()・pdb_get_lanman_passwd()・pdb_getsampwnam()・samu_new()・unbecome_root().

参照元 api_SetUserPassword().

{
        uchar unenc_new_pw[16];
        uchar unenc_old_pw[16];
        struct samu *sampass = NULL;
        uint32 acct_ctrl;
        const uint8 *lanman_pw;
        BOOL ret;

        if ( !(sampass = samu_new(NULL)) ) {
                DEBUG(0, ("samu_new() failed!\n"));
                return False;
        }
        
        become_root();
        ret = pdb_getsampwnam(sampass, user);
        unbecome_root();

        if (ret == False) {
                DEBUG(0,("check_lanman_password: getsampwnam returned NULL\n"));
                TALLOC_FREE(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));
                TALLOC_FREE(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"));
                        TALLOC_FREE(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"));
                TALLOC_FREE(sampass);
                return False;
        }

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

BOOL change_lanman_password	(	struct samu *	sampass,
		uchar *	pass2
	)

chgpasswd.c の 658 行で定義されています。

参照先 samu::acct_ctrl・D_P16()・E_P16()・PDB_CHANGED・pdb_get_acct_ctrl()・pdb_get_lanman_passwd()・pdb_get_username()・pdb_set_lanman_passwd()・pdb_set_nt_passwd()・pdb_set_pass_last_set_time()・pdb_update_sam_account().

参照元 api_SetUserPassword().

{
        static uchar null_pw[16];
        uchar unenc_new_pw[16];
        BOOL ret;
        uint32 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_last_set_time  (sampass, time(NULL), PDB_CHANGED)) {
                TALLOC_FREE(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 = NT_STATUS_IS_OK(pdb_update_sam_account (sampass));

        return ret;
}

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],
		uint32 *	reject_reason
	)

chgpasswd.c の 721 行で定義されています。

参照先 become_root()・change_oem_password()・check_oem_password()・new_passwd・unbecome_root().

参照元 _samr_chgpasswd_user()・_samr_chgpasswd_user3()・api_SamOEMChangePassword().

{
        pstring new_passwd;
        struct samu *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, reject_reason);
        unbecome_root();

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

        TALLOC_FREE(sampass);

        return nt_status;
}

static BOOL check_passwd_history	(	struct samu *	sampass,
		const char *	plaintext
	)			[static]

chgpasswd.c の 965 行で定義されています。

参照先 current_salt・dump_data()・E_md4hash()・E_md5hash()・samu::nt_pw・pdb_get_account_policy()・pdb_get_nt_passwd()・pdb_get_pw_history()・pdb_get_username().

参照元 change_oem_password().

{
        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;
}

NTSTATUS change_oem_password	(	struct samu *	hnd,
		char *	old_passwd,
		char *	new_passwd,
		BOOL	as_root,
		uint32 *	samr_reject_reason
	)

chgpasswd.c の 1032 行で定義されています。

参照先 check_passwd_history()・chgpasswd()・Get_Pwnam()・http_timestring()・pdb_get_account_policy()・pdb_get_pass_can_change()・pdb_get_pass_can_change_time()・pdb_get_username()・pdb_set_plaintext_passwd()・pdb_update_sam_account()・smbrunsecret()・str_charnum()・username.

参照元 api_SetUserPassword()・pass_oem_change().

{
        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 (samr_reject_reason) {
                *samr_reject_reason = Undefined;
        }

        /* check to see if the secdesc has previously been set to disallow */
        if (!pdb_get_pass_can_change(hnd)) {
                DEBUG(1, ("user %s does not have permissions to change password\n", username));
                if (samr_reject_reason) {
                        *samr_reject_reason = REJECT_REASON_OTHER;
                }
                return NT_STATUS_ACCOUNT_RESTRICTION;
        }

        /* removed calculation here, becuase passdb now calculates
           based on policy.  jmcd */
        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)));
                if (samr_reject_reason) {
                        *samr_reject_reason = REJECT_REASON_OTHER;
                }
                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));
                if (samr_reject_reason) {
                        *samr_reject_reason = REJECT_REASON_TOO_SHORT;
                }
                return NT_STATUS_PASSWORD_RESTRICTION;
/*              return NT_STATUS_PWD_TOO_SHORT; */
        }

        if (check_passwd_history(hnd,new_passwd)) {
                if (samr_reject_reason) {
                        *samr_reject_reason = REJECT_REASON_IN_HISTORY;
                }
                return NT_STATUS_PASSWORD_RESTRICTION;
        }

        pass = Get_Pwnam(username);
        if (!pass) {
                DEBUG(1, ("change_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"));
                        if (samr_reject_reason) {
                                *samr_reject_reason = REJECT_REASON_NOT_COMPLEX;
                        }
                        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. */
        return pdb_update_sam_account (hnd);
}

---

変数

struct passdb_ops pdb_ops

---