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https://github.com/samba-team/samba.git
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c6a21e1897
Signed-off-by: Andreas Schneider <asn@samba.org> Reviewed-by: Alexander Bokovoy <ab@samba.org>
1297 lines
34 KiB
C
1297 lines
34 KiB
C
/*
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Unix SMB/CIFS implementation.
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Samba utility functions
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Copyright (C) Andrew Tridgell 1992-1998
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Copyright (C) Andrew Bartlett 2001-2004
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* These comments regard the code to change the user's unix password: */
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/* fork a child process to exec passwd and write to its
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* tty to change a users password. This is running as the
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* user who is attempting to change the password.
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*/
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/*
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* This code was copied/borrowed and stolen from various sources.
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* The primary source was the poppasswd.c from the authors of POPMail. This software
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* was included as a client to change passwords using the 'passwd' program
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* on the remote machine.
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*
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* This code has been hacked by Bob Nance (nance@niehs.nih.gov) and Evan Patterson
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* (patters2@niehs.nih.gov) at the National Institute of Environmental Health Sciences
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* and rights to modify, distribute or incorporate this change to the CAP suite or
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* using it for any other reason are granted, so long as this disclaimer is left intact.
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*/
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/*
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This code was hacked considerably for inclusion in Samba, primarily
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by Andrew.Tridgell@anu.edu.au. The biggest change was the addition
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of the "password chat" option, which allows the easy runtime
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specification of the expected sequence of events to change a
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password.
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*/
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#include "includes.h"
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#include "system/terminal.h"
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#include "system/passwd.h"
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#include "system/filesys.h"
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#include "../libcli/auth/libcli_auth.h"
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#include "rpc_server/samr/srv_samr_util.h"
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#include "passdb.h"
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#include "auth.h"
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#include "lib/util/sys_rw.h"
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#include "lib/crypto/gnutls_helpers.h"
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#include <gnutls/gnutls.h>
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#include <gnutls/crypto.h>
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#ifndef ALLOW_CHANGE_PASSWORD
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#if (defined(HAVE_TERMIOS_H) && defined(HAVE_DUP2) && defined(HAVE_SETSID))
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#define ALLOW_CHANGE_PASSWORD 1
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#endif
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#endif
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#if ALLOW_CHANGE_PASSWORD
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static int findpty(char **slave)
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{
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int master = -1;
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char *line = NULL;
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DIR *dirp = NULL;
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const char *dpname;
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*slave = NULL;
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#if defined(HAVE_GRANTPT)
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#if defined(HAVE_POSIX_OPENPT)
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master = posix_openpt(O_RDWR|O_NOCTTY);
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#else
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/* Try to open /dev/ptmx. If that fails, fall through to old method. */
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master = open("/dev/ptmx", O_RDWR, 0);
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#endif
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if (master >= 0) {
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grantpt(master);
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unlockpt(master);
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line = (char *)ptsname(master);
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if (line) {
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*slave = SMB_STRDUP(line);
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}
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if (*slave == NULL) {
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DEBUG(0,
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("findpty: Unable to create master/slave pty pair.\n"));
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/* Stop fd leak on error. */
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close(master);
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return -1;
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} else {
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DEBUG(10,
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("findpty: Allocated slave pty %s\n", *slave));
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return (master);
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}
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}
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#endif /* HAVE_GRANTPT */
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line = SMB_STRDUP("/dev/ptyXX");
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if (!line) {
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return (-1);
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}
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dirp = opendir("/dev");
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if (!dirp) {
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SAFE_FREE(line);
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return (-1);
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}
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while ((dpname = readdirname(dirp)) != NULL) {
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if (strncmp(dpname, "pty", 3) == 0 && strlen(dpname) == 5) {
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DEBUG(3,
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("pty: try to open %s, line was %s\n", dpname,
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line));
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line[8] = dpname[3];
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line[9] = dpname[4];
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if ((master = open(line, O_RDWR, 0)) >= 0) {
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DEBUG(3, ("pty: opened %s\n", line));
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line[5] = 't';
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*slave = line;
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closedir(dirp);
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return (master);
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}
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}
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}
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closedir(dirp);
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SAFE_FREE(line);
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return (-1);
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}
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static int dochild(int master, const char *slavedev, const struct passwd *pass,
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const char *passwordprogram, bool as_root)
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{
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int slave;
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struct termios stermios;
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gid_t gid;
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uid_t uid;
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char * const eptrs[1] = { NULL };
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if (pass == NULL)
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{
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DEBUG(0,
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("dochild: user doesn't exist in the UNIX password database.\n"));
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return False;
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}
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gid = pass->pw_gid;
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uid = pass->pw_uid;
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gain_root_privilege();
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/* Start new session - gets rid of controlling terminal. */
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if (setsid() < 0)
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{
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DEBUG(3,
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("Weirdness, couldn't let go of controlling terminal\n"));
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return (False);
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}
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/* Open slave pty and acquire as new controlling terminal. */
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if ((slave = open(slavedev, O_RDWR, 0)) < 0)
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{
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DEBUG(3, ("More weirdness, could not open %s\n", slavedev));
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return (False);
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}
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#if defined(TIOCSCTTY) && !defined(SUNOS5)
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/*
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* On patched Solaris 10 TIOCSCTTY is defined but seems not to work,
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* see the discussion under
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* https://bugzilla.samba.org/show_bug.cgi?id=5366.
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*/
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if (ioctl(slave, TIOCSCTTY, 0) < 0)
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{
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DEBUG(3, ("Error in ioctl call for slave pty\n"));
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/* return(False); */
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}
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#elif defined(I_PUSH) && defined(I_FIND)
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if (ioctl(slave, I_FIND, "ptem") == 0) {
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ioctl(slave, I_PUSH, "ptem");
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}
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if (ioctl(slave, I_FIND, "ldterm") == 0) {
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ioctl(slave, I_PUSH, "ldterm");
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}
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#endif
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/* Close master. */
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close(master);
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/* Make slave stdin/out/err of child. */
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if (dup2(slave, STDIN_FILENO) != STDIN_FILENO)
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{
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DEBUG(3, ("Could not re-direct stdin\n"));
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return (False);
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}
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if (dup2(slave, STDOUT_FILENO) != STDOUT_FILENO)
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{
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DEBUG(3, ("Could not re-direct stdout\n"));
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return (False);
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}
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if (dup2(slave, STDERR_FILENO) != STDERR_FILENO)
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{
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DEBUG(3, ("Could not re-direct stderr\n"));
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return (False);
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}
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if (slave > 2)
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close(slave);
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/* Set proper terminal attributes - no echo, canonical input processing,
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no map NL to CR/NL on output. */
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if (tcgetattr(0, &stermios) < 0)
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{
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DEBUG(3,
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("could not read default terminal attributes on pty\n"));
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return (False);
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}
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stermios.c_lflag &= ~(ECHO | ECHOE | ECHOK | ECHONL);
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stermios.c_lflag |= ICANON;
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#ifdef ONLCR
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stermios.c_oflag &= ~(ONLCR);
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#endif
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if (tcsetattr(0, TCSANOW, &stermios) < 0)
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{
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DEBUG(3, ("could not set attributes of pty\n"));
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return (False);
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}
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/* make us completely into the right uid */
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if (!as_root)
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{
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become_user_permanently(uid, gid);
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}
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DEBUG(10,
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("Invoking '%s' as password change program.\n",
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passwordprogram));
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/* execl() password-change application */
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if (execle("/bin/sh", "sh", "-c", passwordprogram, NULL, eptrs) < 0)
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{
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DEBUG(3, ("Bad status returned from %s\n", passwordprogram));
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return (False);
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}
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return (True);
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}
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static int expect(int master, char *issue, char *expected)
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{
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char buffer[1024];
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int attempts, timeout, nread;
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size_t len;
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bool match = False;
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for (attempts = 0; attempts < 2; attempts++) {
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NTSTATUS status;
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if (!strequal(issue, ".")) {
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if (lp_passwd_chat_debug())
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DEBUG(100, ("expect: sending [%s]\n", issue));
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if ((len = sys_write(master, issue, strlen(issue))) != strlen(issue)) {
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DEBUG(2,("expect: (short) write returned %d\n",
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(int)len ));
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return False;
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}
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}
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if (strequal(expected, "."))
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return True;
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/* Initial timeout. */
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timeout = lp_passwd_chat_timeout() * 1000;
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nread = 0;
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buffer[nread] = 0;
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while (True) {
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status = read_fd_with_timeout(
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master, buffer + nread, 1,
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sizeof(buffer) - nread - 1,
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timeout, &len);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(2, ("expect: read error %s\n",
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nt_errstr(status)));
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break;
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}
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nread += len;
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buffer[nread] = 0;
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{
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/* Eat leading/trailing whitespace before match. */
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char *str = SMB_STRDUP(buffer);
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if (!str) {
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DEBUG(2,("expect: ENOMEM\n"));
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return False;
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}
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trim_char(str, ' ', ' ');
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if ((match = unix_wild_match(expected, str)) == True) {
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/* Now data has started to return, lower timeout. */
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timeout = lp_passwd_chat_timeout() * 100;
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}
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SAFE_FREE(str);
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}
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}
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if (lp_passwd_chat_debug())
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DEBUG(100, ("expect: expected [%s] received [%s] match %s\n",
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expected, buffer, match ? "yes" : "no" ));
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if (match)
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break;
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(2, ("expect: %s\n", nt_errstr(status)));
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return False;
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}
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}
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DEBUG(10,("expect: returning %s\n", match ? "True" : "False" ));
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return match;
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}
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static void pwd_sub(char *buf)
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{
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all_string_sub(buf, "\\n", "\n", 0);
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all_string_sub(buf, "\\r", "\r", 0);
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all_string_sub(buf, "\\s", " ", 0);
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all_string_sub(buf, "\\t", "\t", 0);
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}
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static int talktochild(int master, const char *seq)
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{
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TALLOC_CTX *frame = talloc_stackframe();
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int count = 0;
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char *issue;
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char *expected;
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issue = talloc_strdup(frame, ".");
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if (!issue) {
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TALLOC_FREE(frame);
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return false;
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}
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while (next_token_talloc(frame, &seq, &expected, NULL)) {
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pwd_sub(expected);
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count++;
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if (!expect(master, issue, expected)) {
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DEBUG(3, ("Response %d incorrect\n", count));
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TALLOC_FREE(frame);
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return false;
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}
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if (!next_token_talloc(frame, &seq, &issue, NULL)) {
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issue = talloc_strdup(frame, ".");
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if (!issue) {
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TALLOC_FREE(frame);
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return false;
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}
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}
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pwd_sub(issue);
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}
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if (!strequal(issue, ".")) {
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/* we have one final issue to send */
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expected = talloc_strdup(frame, ".");
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if (!expected) {
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TALLOC_FREE(frame);
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return false;
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}
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if (!expect(master, issue, expected)) {
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TALLOC_FREE(frame);
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return False;
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}
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}
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TALLOC_FREE(frame);
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return (count > 0);
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}
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static bool chat_with_program(char *passwordprogram, const struct passwd *pass,
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char *chatsequence, bool as_root)
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{
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char *slavedev = NULL;
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int master;
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pid_t pid, wpid;
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int wstat;
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bool chstat = False;
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void (*saved_handler)(int);
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if (pass == NULL) {
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DEBUG(0, ("chat_with_program: user doesn't exist in the UNIX password database.\n"));
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return False;
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}
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/* allocate a pseudo-terminal device */
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if ((master = findpty(&slavedev)) < 0) {
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DEBUG(3, ("chat_with_program: Cannot Allocate pty for password change: %s\n", pass->pw_name));
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return (False);
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}
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/*
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* We need to temporarily stop CatchChild from eating
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* SIGCLD signals as it also eats the exit status code. JRA.
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*/
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saved_handler = CatchChildLeaveStatus();
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if ((pid = fork()) < 0) {
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DEBUG(3, ("chat_with_program: Cannot fork() child for password change: %s\n", pass->pw_name));
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SAFE_FREE(slavedev);
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close(master);
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(void)CatchSignal(SIGCLD, saved_handler);
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return (False);
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}
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/* we now have a pty */
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if (pid > 0) { /* This is the parent process */
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/* Don't need this anymore in parent. */
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SAFE_FREE(slavedev);
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if ((chstat = talktochild(master, chatsequence)) == False) {
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DEBUG(3, ("chat_with_program: Child failed to change password: %s\n", pass->pw_name));
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kill(pid, SIGKILL); /* be sure to end this process */
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}
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while ((wpid = waitpid(pid, &wstat, 0)) < 0) {
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if (errno == EINTR) {
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errno = 0;
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continue;
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}
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break;
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}
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if (wpid < 0) {
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DEBUG(3, ("chat_with_program: The process is no longer waiting!\n\n"));
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close(master);
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(void)CatchSignal(SIGCLD, saved_handler);
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return (False);
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}
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/*
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* Go back to ignoring children.
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*/
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(void)CatchSignal(SIGCLD, saved_handler);
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close(master);
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if (pid != wpid) {
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DEBUG(3, ("chat_with_program: We were waiting for the wrong process ID\n"));
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return (False);
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}
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if (WIFEXITED(wstat) && (WEXITSTATUS(wstat) != 0)) {
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DEBUG(3, ("chat_with_program: The process exited with status %d \
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while we were waiting\n", WEXITSTATUS(wstat)));
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return (False);
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}
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#if defined(WIFSIGNALLED) && defined(WTERMSIG)
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else if (WIFSIGNALLED(wstat)) {
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DEBUG(3, ("chat_with_program: The process was killed by signal %d \
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while we were waiting\n", WTERMSIG(wstat)));
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return (False);
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}
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#endif
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} else {
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/* CHILD */
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/*
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* Lose any elevated privileges.
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*/
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drop_effective_capability(KERNEL_OPLOCK_CAPABILITY);
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drop_effective_capability(DMAPI_ACCESS_CAPABILITY);
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/* make sure it doesn't freeze */
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alarm(20);
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if (as_root)
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become_root();
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DEBUG(3, ("chat_with_program: Dochild for user %s (uid=%d,gid=%d) (as_root = %s)\n", pass->pw_name,
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(int)getuid(), (int)getgid(), BOOLSTR(as_root) ));
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chstat = dochild(master, slavedev, pass, passwordprogram, as_root);
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if (as_root)
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unbecome_root();
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/*
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* The child should never return from dochild() ....
|
|
*/
|
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|
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DEBUG(0, ("chat_with_program: Error: dochild() returned %d\n", chstat));
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exit(1);
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}
|
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|
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if (chstat)
|
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DEBUG(3, ("chat_with_program: Password change %ssuccessful for user %s\n",
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(chstat ? "" : "un"), pass->pw_name));
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return (chstat);
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}
|
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|
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bool chgpasswd(const char *name, const char *rhost, const struct passwd *pass,
|
|
const char *oldpass, const char *newpass, bool as_root)
|
|
{
|
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const struct loadparm_substitution *lp_sub =
|
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loadparm_s3_global_substitution();
|
|
char *passwordprogram = NULL;
|
|
char *chatsequence = NULL;
|
|
size_t i;
|
|
size_t len;
|
|
TALLOC_CTX *ctx = talloc_tos();
|
|
|
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if (!oldpass) {
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oldpass = "";
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}
|
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|
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DEBUG(3, ("chgpasswd: Password change (as_root=%s) for user: %s\n", BOOLSTR(as_root), name));
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|
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#ifdef DEBUG_PASSWORD
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DEBUG(100, ("chgpasswd: Passwords: old=%s new=%s\n", oldpass, newpass));
|
|
#endif
|
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|
|
/* 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
|
|
const char *prevlocale = setlocale(LC_ALL, "C");
|
|
#endif
|
|
|
|
if (as_root)
|
|
become_root();
|
|
|
|
if (pass) {
|
|
ret = smb_pam_passchange(pass->pw_name, rhost,
|
|
oldpass, newpass);
|
|
} else {
|
|
ret = smb_pam_passchange(name, rhost, 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;
|
|
}
|
|
|
|
passwordprogram = lp_passwd_program(ctx, lp_sub);
|
|
if (!passwordprogram || !*passwordprogram) {
|
|
DEBUG(2, ("chgpasswd: Null password program - no password changing\n"));
|
|
return false;
|
|
}
|
|
chatsequence = lp_passwd_chat(ctx, lp_sub);
|
|
if (!chatsequence || !*chatsequence) {
|
|
DEBUG(2, ("chgpasswd: Null chat sequence - 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;
|
|
}
|
|
}
|
|
|
|
passwordprogram = talloc_string_sub(ctx, passwordprogram, "%u", name);
|
|
if (!passwordprogram) {
|
|
return false;
|
|
}
|
|
|
|
/* note that we do NOT substitute the %o and %n in the password program
|
|
as this would open up a security hole where the user could use
|
|
a new password containing shell escape characters */
|
|
|
|
chatsequence = talloc_string_sub(ctx, chatsequence, "%u", name);
|
|
if (!chatsequence) {
|
|
return false;
|
|
}
|
|
chatsequence = talloc_all_string_sub(ctx,
|
|
chatsequence,
|
|
"%o",
|
|
oldpass);
|
|
if (!chatsequence) {
|
|
return false;
|
|
}
|
|
chatsequence = talloc_all_string_sub(ctx,
|
|
chatsequence,
|
|
"%n",
|
|
newpass);
|
|
if (chatsequence == NULL) {
|
|
return false;
|
|
}
|
|
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 */
|
|
|
|
/***********************************************************
|
|
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],
|
|
struct samu *sampass,
|
|
char **pp_new_passwd)
|
|
{
|
|
uchar null_pw[16];
|
|
uchar null_ntpw[16];
|
|
uint8_t *password_encrypted;
|
|
const uint8_t *encryption_key;
|
|
const uint8_t *lanman_pw, *nt_pw;
|
|
uint32_t acct_ctrl;
|
|
size_t new_pw_len;
|
|
uchar new_nt_hash[16];
|
|
uchar new_lm_hash[16];
|
|
uchar verifier[16];
|
|
char no_pw[2];
|
|
|
|
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);
|
|
enum ntlm_auth_level ntlm_auth_level = lp_ntlm_auth();
|
|
|
|
gnutls_cipher_hd_t cipher_hnd = NULL;
|
|
gnutls_datum_t enc_key;
|
|
int rc;
|
|
|
|
/* this call should be disabled without NTLM auth */
|
|
if (ntlm_auth_level == NTLM_AUTH_DISABLED) {
|
|
DBG_WARNING("NTLM password changes not"
|
|
"permitted by configuration.\n");
|
|
return NT_STATUS_NTLM_BLOCKED;
|
|
}
|
|
|
|
acct_ctrl = pdb_get_acct_ctrl(sampass);
|
|
#if 0
|
|
/* I am convinced this check here is wrong, it is valid to
|
|
* change a password of a user that has a disabled account - gd */
|
|
|
|
if (acct_ctrl & ACB_DISABLED) {
|
|
DEBUG(2,("check_lanman_password: account %s disabled.\n", user));
|
|
return NT_STATUS_ACCOUNT_DISABLED;
|
|
}
|
|
#endif
|
|
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));
|
|
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));
|
|
}
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
} else {
|
|
DEBUG(1, ("password change requested for user %s, but no password supplied!\n",
|
|
user));
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
/*
|
|
* Decrypt the password with the key
|
|
*/
|
|
enc_key = (gnutls_datum_t) {
|
|
.data = discard_const_p(unsigned char, encryption_key),
|
|
.size = 16,
|
|
};
|
|
|
|
GNUTLS_FIPS140_SET_LAX_MODE();
|
|
rc = gnutls_cipher_init(&cipher_hnd,
|
|
GNUTLS_CIPHER_ARCFOUR_128,
|
|
&enc_key,
|
|
NULL);
|
|
if (rc < 0) {
|
|
GNUTLS_FIPS140_SET_STRICT_MODE();
|
|
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
|
|
}
|
|
|
|
rc = gnutls_cipher_decrypt(cipher_hnd,
|
|
password_encrypted,
|
|
516);
|
|
gnutls_cipher_deinit(cipher_hnd);
|
|
GNUTLS_FIPS140_SET_STRICT_MODE();
|
|
if (rc < 0) {
|
|
return gnutls_error_to_ntstatus(rc, NT_STATUS_CRYPTO_SYSTEM_INVALID);
|
|
}
|
|
|
|
if (!decode_pw_buffer(talloc_tos(),
|
|
password_encrypted,
|
|
pp_new_passwd,
|
|
&new_pw_len,
|
|
nt_pass_set ? CH_UTF16 : CH_DOS)) {
|
|
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(*pp_new_passwd, new_nt_hash);
|
|
|
|
if (nt_pw) {
|
|
/*
|
|
* check the NT verifier
|
|
*/
|
|
rc = E_old_pw_hash(new_nt_hash, nt_pw, verifier);
|
|
if (rc != 0) {
|
|
NTSTATUS status = NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER;
|
|
return gnutls_error_to_ntstatus(rc, status);
|
|
}
|
|
if (memcmp(verifier, old_nt_hash_encrypted, 16)) {
|
|
DEBUG(0, ("check_oem_password: old nt "
|
|
"password doesn't match.\n"));
|
|
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", *pp_new_passwd));
|
|
#endif
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
if (lanman_pw) {
|
|
/*
|
|
* check the lm verifier
|
|
*/
|
|
rc = E_old_pw_hash(new_nt_hash, lanman_pw, verifier);
|
|
if (rc != 0) {
|
|
NTSTATUS status = NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER;
|
|
return gnutls_error_to_ntstatus(rc, status);
|
|
}
|
|
if (memcmp(verifier, old_lm_hash_encrypted, 16)) {
|
|
DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
#ifdef DEBUG_PASSWORD
|
|
DEBUG(100,
|
|
("check_oem_password: password %s ok\n", *pp_new_passwd));
|
|
#endif
|
|
return NT_STATUS_OK;
|
|
}
|
|
}
|
|
|
|
if (lanman_pw && lm_pass_set) {
|
|
|
|
E_deshash(*pp_new_passwd, new_lm_hash);
|
|
|
|
/*
|
|
* check the lm verifier
|
|
*/
|
|
rc = E_old_pw_hash(new_lm_hash, lanman_pw, verifier);
|
|
if (rc != 0) {
|
|
NTSTATUS status = NT_STATUS_ACCESS_DISABLED_BY_POLICY_OTHER;
|
|
return gnutls_error_to_ntstatus(rc, status);
|
|
}
|
|
if (memcmp(verifier, old_lm_hash_encrypted, 16)) {
|
|
DEBUG(0,("check_oem_password: old lm password doesn't match.\n"));
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
#ifdef DEBUG_PASSWORD
|
|
DEBUG(100,
|
|
("check_oem_password: password %s ok\n", *pp_new_passwd));
|
|
#endif
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/* should not be reached */
|
|
return NT_STATUS_WRONG_PASSWORD;
|
|
}
|
|
|
|
static bool password_in_history(uint8_t nt_pw[NT_HASH_LEN],
|
|
uint32_t pw_history_len,
|
|
const uint8_t *pw_history)
|
|
{
|
|
int i;
|
|
|
|
dump_data(100, nt_pw, NT_HASH_LEN);
|
|
dump_data(100, pw_history, PW_HISTORY_ENTRY_LEN * pw_history_len);
|
|
|
|
for (i=0; i<pw_history_len; i++) {
|
|
uint8_t new_nt_pw_salted_md5_hash[SALTED_MD5_HASH_LEN];
|
|
const uint8_t *current_salt;
|
|
const uint8_t *old_nt_pw_salted_md5_hash;
|
|
|
|
current_salt = &pw_history[i*PW_HISTORY_ENTRY_LEN];
|
|
old_nt_pw_salted_md5_hash = current_salt + PW_HISTORY_SALT_LEN;
|
|
|
|
if (all_zero(old_nt_pw_salted_md5_hash, SALTED_MD5_HASH_LEN)) {
|
|
/* Ignore zero valued entries. */
|
|
continue;
|
|
}
|
|
|
|
if (all_zero(current_salt, PW_HISTORY_SALT_LEN)) {
|
|
/*
|
|
* New format: zero salt and then plain nt hash.
|
|
* Directly compare the hashes.
|
|
*/
|
|
if (memcmp(nt_pw, old_nt_pw_salted_md5_hash,
|
|
SALTED_MD5_HASH_LEN) == 0)
|
|
{
|
|
return true;
|
|
}
|
|
} else {
|
|
gnutls_hash_hd_t hash_hnd = NULL;
|
|
int rc;
|
|
|
|
/*
|
|
* Old format: md5sum of salted nt hash.
|
|
* Create salted version of new pw to compare.
|
|
*/
|
|
rc = gnutls_hash_init(&hash_hnd, GNUTLS_DIG_MD5);
|
|
if (rc < 0) {
|
|
return false;
|
|
}
|
|
|
|
rc = gnutls_hash(hash_hnd, current_salt, 16);
|
|
if (rc < 0) {
|
|
gnutls_hash_deinit(hash_hnd, NULL);
|
|
return false;
|
|
}
|
|
rc = gnutls_hash(hash_hnd, nt_pw, 16);
|
|
if (rc < 0) {
|
|
gnutls_hash_deinit(hash_hnd, NULL);
|
|
return false;
|
|
}
|
|
gnutls_hash_deinit(hash_hnd, new_nt_pw_salted_md5_hash);
|
|
|
|
if (memcmp(new_nt_pw_salted_md5_hash,
|
|
old_nt_pw_salted_md5_hash,
|
|
SALTED_MD5_HASH_LEN) == 0) {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/***********************************************************
|
|
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(struct samu *sampass, const char *plaintext)
|
|
{
|
|
uchar new_nt_p16[NT_HASH_LEN];
|
|
const uint8_t *nt_pw;
|
|
const uint8_t *pwhistory;
|
|
uint32_t pwHisLen, curr_pwHisLen;
|
|
|
|
pdb_get_account_policy(PDB_POLICY_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;
|
|
}
|
|
|
|
if (password_in_history(new_nt_p16, pwHisLen, pwhistory)) {
|
|
DEBUG(1,("check_passwd_history: proposed new password for "
|
|
"user %s found in history list !\n",
|
|
pdb_get_username(sampass) ));
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
/***********************************************************
|
|
************************************************************/
|
|
|
|
NTSTATUS check_password_complexity(const char *username,
|
|
const char *fullname,
|
|
const char *password,
|
|
enum samPwdChangeReason *samr_reject_reason)
|
|
{
|
|
TALLOC_CTX *tosctx = talloc_tos();
|
|
const struct loadparm_substitution *lp_sub =
|
|
loadparm_s3_global_substitution();
|
|
int check_ret;
|
|
char *cmd;
|
|
|
|
/* Use external script to check password complexity */
|
|
if ((lp_check_password_script(tosctx, lp_sub) == NULL)
|
|
|| (*(lp_check_password_script(tosctx, lp_sub)) == '\0')){
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
cmd = talloc_string_sub(tosctx, lp_check_password_script(tosctx, lp_sub), "%u",
|
|
username);
|
|
if (!cmd) {
|
|
return NT_STATUS_PASSWORD_RESTRICTION;
|
|
}
|
|
|
|
check_ret = setenv("SAMBA_CPS_ACCOUNT_NAME", username, 1);
|
|
if (check_ret != 0) {
|
|
return map_nt_error_from_unix_common(errno);
|
|
}
|
|
unsetenv("SAMBA_CPS_USER_PRINCIPAL_NAME");
|
|
if (fullname != NULL) {
|
|
check_ret = setenv("SAMBA_CPS_FULL_NAME", fullname, 1);
|
|
} else {
|
|
unsetenv("SAMBA_CPS_FULL_NAME");
|
|
}
|
|
if (check_ret != 0) {
|
|
return map_nt_error_from_unix_common(errno);
|
|
}
|
|
check_ret = smbrunsecret(cmd, password);
|
|
unsetenv("SAMBA_CPS_ACCOUNT_NAME");
|
|
unsetenv("SAMBA_CPS_USER_PRINCIPAL_NAME");
|
|
unsetenv("SAMBA_CPS_FULL_NAME");
|
|
DEBUG(5,("check_password_complexity: check password script (%s) "
|
|
"returned [%d]\n", cmd, check_ret));
|
|
TALLOC_FREE(cmd);
|
|
|
|
if (check_ret != 0) {
|
|
DEBUG(1,("check_password_complexity: "
|
|
"check password script said new password is not good "
|
|
"enough!\n"));
|
|
if (samr_reject_reason) {
|
|
*samr_reject_reason = SAM_PWD_CHANGE_NOT_COMPLEX;
|
|
}
|
|
return NT_STATUS_PASSWORD_RESTRICTION;
|
|
}
|
|
|
|
return NT_STATUS_OK;
|
|
}
|
|
|
|
/***********************************************************
|
|
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.
|
|
************************************************************/
|
|
|
|
static NTSTATUS change_oem_password(struct samu *hnd, const char *rhost,
|
|
char *old_passwd, char *new_passwd,
|
|
bool as_root,
|
|
enum samPwdChangeReason *samr_reject_reason)
|
|
{
|
|
uint32_t min_len;
|
|
uint32_t refuse;
|
|
TALLOC_CTX *tosctx = talloc_tos();
|
|
struct passwd *pass = NULL;
|
|
const char *username = pdb_get_username(hnd);
|
|
const char *fullname = pdb_get_fullname(hnd);
|
|
time_t can_change_time = pdb_get_pass_can_change_time(hnd);
|
|
NTSTATUS status;
|
|
|
|
if (samr_reject_reason) {
|
|
*samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
|
|
}
|
|
|
|
/* 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 = SAM_PWD_CHANGE_NO_ERROR;
|
|
}
|
|
return NT_STATUS_ACCOUNT_RESTRICTION;
|
|
}
|
|
|
|
/* check to see if it is a Machine account and if the policy
|
|
* denies machines to change the password. *
|
|
* Should we deny also SRVTRUST and/or DOMSTRUST ? .SSS. */
|
|
if (pdb_get_acct_ctrl(hnd) & ACB_WSTRUST) {
|
|
if (pdb_get_account_policy(PDB_POLICY_REFUSE_MACHINE_PW_CHANGE, &refuse) && refuse) {
|
|
DEBUG(1, ("Machine %s cannot change password now, "
|
|
"denied by Refuse Machine Password Change policy\n",
|
|
username));
|
|
if (samr_reject_reason) {
|
|
*samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
|
|
}
|
|
return NT_STATUS_ACCOUNT_RESTRICTION;
|
|
}
|
|
}
|
|
|
|
/* removed calculation here, because 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(tosctx, can_change_time)));
|
|
if (samr_reject_reason) {
|
|
*samr_reject_reason = SAM_PWD_CHANGE_NO_ERROR;
|
|
}
|
|
return NT_STATUS_ACCOUNT_RESTRICTION;
|
|
}
|
|
|
|
if (pdb_get_account_policy(PDB_POLICY_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 = SAM_PWD_CHANGE_PASSWORD_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 = SAM_PWD_CHANGE_PWD_IN_HISTORY;
|
|
}
|
|
return NT_STATUS_PASSWORD_RESTRICTION;
|
|
}
|
|
|
|
pass = Get_Pwnam_alloc(tosctx, username);
|
|
if (!pass) {
|
|
DEBUG(1, ("change_oem_password: Username %s does not exist in system !?!\n", username));
|
|
return NT_STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
status = check_password_complexity(username,
|
|
fullname,
|
|
new_passwd,
|
|
samr_reject_reason);
|
|
if (!NT_STATUS_IS_OK(status)) {
|
|
TALLOC_FREE(pass);
|
|
return status;
|
|
}
|
|
|
|
/*
|
|
* 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, rhost, pass, old_passwd, new_passwd,
|
|
as_root)) {
|
|
TALLOC_FREE(pass);
|
|
return NT_STATUS_ACCESS_DENIED;
|
|
}
|
|
|
|
TALLOC_FREE(pass);
|
|
|
|
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);
|
|
}
|
|
|
|
/***********************************************************
|
|
Code to check and change the OEM hashed password.
|
|
************************************************************/
|
|
|
|
NTSTATUS pass_oem_change(char *user, const char *rhost,
|
|
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],
|
|
enum samPwdChangeReason *reject_reason)
|
|
{
|
|
char *new_passwd = NULL;
|
|
struct samu *sampass = NULL;
|
|
NTSTATUS nt_status;
|
|
bool ret = false;
|
|
bool updated_badpw = false;
|
|
NTSTATUS update_login_attempts_status;
|
|
|
|
if (!(sampass = samu_new(NULL))) {
|
|
return NT_STATUS_NO_MEMORY;
|
|
}
|
|
|
|
become_root();
|
|
ret = pdb_getsampwnam(sampass, user);
|
|
unbecome_root();
|
|
|
|
if (ret == false) {
|
|
DEBUG(0,("pass_oem_change: getsmbpwnam returned NULL\n"));
|
|
TALLOC_FREE(sampass);
|
|
return NT_STATUS_NO_SUCH_USER;
|
|
}
|
|
|
|
/* Quit if the account was locked out. */
|
|
if (pdb_get_acct_ctrl(sampass) & ACB_AUTOLOCK) {
|
|
DEBUG(3,("check_sam_security: Account for user %s was locked out.\n", user));
|
|
TALLOC_FREE(sampass);
|
|
return NT_STATUS_ACCOUNT_LOCKED_OUT;
|
|
}
|
|
|
|
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);
|
|
|
|
/*
|
|
* Notify passdb backend of login success/failure. If not
|
|
* NT_STATUS_OK the backend doesn't like the login
|
|
*/
|
|
update_login_attempts_status = pdb_update_login_attempts(sampass,
|
|
NT_STATUS_IS_OK(nt_status));
|
|
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
bool increment_bad_pw_count = false;
|
|
|
|
if (NT_STATUS_EQUAL(nt_status, NT_STATUS_WRONG_PASSWORD) &&
|
|
(pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
|
|
NT_STATUS_IS_OK(update_login_attempts_status))
|
|
{
|
|
increment_bad_pw_count = true;
|
|
}
|
|
|
|
if (increment_bad_pw_count) {
|
|
pdb_increment_bad_password_count(sampass);
|
|
updated_badpw = true;
|
|
} else {
|
|
pdb_update_bad_password_count(sampass,
|
|
&updated_badpw);
|
|
}
|
|
} else {
|
|
|
|
if ((pdb_get_acct_ctrl(sampass) & ACB_NORMAL) &&
|
|
(pdb_get_bad_password_count(sampass) > 0)){
|
|
pdb_set_bad_password_count(sampass, 0, PDB_CHANGED);
|
|
pdb_set_bad_password_time(sampass, 0, PDB_CHANGED);
|
|
updated_badpw = true;
|
|
}
|
|
}
|
|
|
|
if (updated_badpw) {
|
|
NTSTATUS update_status;
|
|
become_root();
|
|
update_status = pdb_update_sam_account(sampass);
|
|
unbecome_root();
|
|
|
|
if (!NT_STATUS_IS_OK(update_status)) {
|
|
DEBUG(1, ("Failed to modify entry: %s\n",
|
|
nt_errstr(update_status)));
|
|
}
|
|
}
|
|
|
|
if (!NT_STATUS_IS_OK(nt_status)) {
|
|
TALLOC_FREE(sampass);
|
|
return nt_status;
|
|
}
|
|
|
|
/* We've already checked the old password here.... */
|
|
become_root();
|
|
nt_status = change_oem_password(sampass, rhost, NULL, new_passwd,
|
|
True, reject_reason);
|
|
unbecome_root();
|
|
|
|
memset(new_passwd, 0, strlen(new_passwd));
|
|
|
|
TALLOC_FREE(sampass);
|
|
|
|
return nt_status;
|
|
}
|