/*

   Unix SMB/Netbios implementation.

   Version 3.0

   handle NLTMSSP, client server side parsing

   Copyright (C) Andrew Tridgell      2001

   Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005

   Copyright (C) Stefan Metzmacher 2005

   This program is free software; you can redistribute it and/or modify

   it under the terms of the GNU General Public License as published by

   the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   This program is distributed in the hope that it will be useful,

   but WITHOUT ANY WARRANTY; without even the implied warranty of

   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License

   along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

#include "includes.h"

#include "system/network.h"

#include "lib/tsocket/tsocket.h"

#include "auth/ntlmssp/ntlmssp.h"

#include "../librpc/gen_ndr/ndr_ntlmssp.h"

#include "auth/ntlmssp/ntlmssp_ndr.h"

#include "auth/ntlmssp/ntlmssp_private.h"

#include "../libcli/auth/libcli_auth.h"

#include "../lib/crypto/crypto.h"

#include "auth/gensec/gensec.h"

#include "auth/gensec/gensec_internal.h"

#include "auth/common_auth.h"

#include "param/param.h"

#include "param/loadparm.h"

#include "libds/common/roles.h"

#undef DBGC_CLASS

#define DBGC_CLASS DBGC_AUTH

/**

 * Return the credentials of a logged on user, including session keys

 * etc.

 *

 * Only valid after a successful authentication

 *

 * May only be called once per authentication.

 *

 */

NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,

             TALLOC_CTX *mem_ctx,

             struct auth_session_info **session_info)

{

  NTSTATUS nt_status;

  struct gensec_ntlmssp_context *gensec_ntlmssp =

    talloc_get_type_abort(gensec_security->private_data,

              struct gensec_ntlmssp_context);

  uint32_t session_info_flags = 0;

  if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {

    session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;

  }

  session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;

  session_info_flags |= AUTH_SESSION_INFO_NTLM;

  if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {

    nt_status = gensec_security->auth_context->generate_session_info(gensec_security->auth_context, mem_ctx,

                     gensec_ntlmssp->server_returned_info,

                     gensec_ntlmssp->ntlmssp_state->user,

                     session_info_flags,

                     session_info);

  } else {

    DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));

    return NT_STATUS_INTERNAL_ERROR;

  }

  NT_STATUS_NOT_OK_RETURN(nt_status);

  nt_status = gensec_ntlmssp_session_key(gensec_security, *session_info,

                 &(*session_info)->session_key);

  if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_USER_SESSION_KEY)) {

    (*session_info)->session_key = data_blob_null;

    nt_status = NT_STATUS_OK;

  }

  return nt_status;

}

/**

 * Start NTLMSSP on the server side

 *

 */

NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)

{

  NTSTATUS nt_status;

  struct ntlmssp_state *ntlmssp_state;

  struct gensec_ntlmssp_context *gensec_ntlmssp;

  const char *netbios_name;

  const char *netbios_domain;

  const char *dns_name;

  const char *dns_domain;

  enum server_role role;

  role = lpcfg_server_role(gensec_security->settings->lp_ctx);

  nt_status = gensec_ntlmssp_start(gensec_security);

  NT_STATUS_NOT_OK_RETURN(nt_status);

  gensec_ntlmssp =

    talloc_get_type_abort(gensec_security->private_data,

              struct gensec_ntlmssp_context);

  ntlmssp_state = talloc_zero(gensec_ntlmssp,

            struct ntlmssp_state);

  if (!ntlmssp_state) {

    return NT_STATUS_NO_MEMORY;

  }

  gensec_ntlmssp->ntlmssp_state = ntlmssp_state;

  ntlmssp_state->role = NTLMSSP_SERVER;

  ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;

  ntlmssp_state->allow_lm_response =

    lpcfg_lanman_auth(gensec_security->settings->lp_ctx);

  if (ntlmssp_state->allow_lm_response &&

      gensec_setting_bool(gensec_security->settings,

        "ntlmssp_server", "allow_lm_key", false))

  {

    ntlmssp_state->allow_lm_key = true;

  }

  ntlmssp_state->force_old_spnego = false;

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "force_old_spnego", false)) {

    /*

     * For testing Windows 2000 mode

     */

    ntlmssp_state->force_old_spnego = true;

  }

  ntlmssp_state->neg_flags =

    NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {

    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;

  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {

    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;

  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {

    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;

  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {

    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;

  }

  if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {

    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;

  }

  if (ntlmssp_state->allow_lm_key) {

    ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;

  }

  /*

   * We always allow NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL.

   *

   * These will be removed if the client doesn't want them.

   */

  ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;

  ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;

  if (role == ROLE_STANDALONE) {

    ntlmssp_state->server.is_standalone = true;

  } else {

    ntlmssp_state->server.is_standalone = false;

  }

  if (gensec_security->settings->server_netbios_name) {

    netbios_name = gensec_security->settings->server_netbios_name;

  } else {

    netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);

  }

  if (gensec_security->settings->server_netbios_domain) {

    netbios_domain = gensec_security->settings->server_netbios_domain;

  } else {

    netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);

  }

  if (gensec_security->settings->server_dns_name) {

    dns_name = gensec_security->settings->server_dns_name;

  } else {

    dns_name = lpcfg_dns_hostname(gensec_security->settings->lp_ctx);

  }

  if (gensec_security->settings->server_dns_domain) {

    dns_domain = gensec_security->settings->server_dns_domain;

  } else {

    dns_domain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);

  }

  ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);

  NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_name);

  ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);

  NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_domain);

  ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);

  NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);

  ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);

  NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);

  ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;

  ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;

  return NT_STATUS_OK;

}