auth/ntlmssp/gensec_ntlmssp_server.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    Version 3.0
   4    handle NLTMSSP, client server side parsing
   5
   6    Copyright (C) Andrew Tridgell      2001
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2001-2005
   8    Copyright (C) Stefan Metzmacher 2005
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "system/network.h"
  26 #include "lib/tsocket/tsocket.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "../librpc/gen_ndr/ndr_ntlmssp.h"
  29 #include "auth/ntlmssp/ntlmssp_ndr.h"
  30 #include "auth/ntlmssp/ntlmssp_private.h"
  31 #include "../libcli/auth/libcli_auth.h"
  32 #include "../lib/crypto/crypto.h"
  33 #include "auth/gensec/gensec.h"
  34 #include "auth/gensec/gensec_internal.h"
  35 #include "auth/common_auth.h"
  36 #include "param/param.h"
  37 #include "param/loadparm.h"
  38 #include "libds/common/roles.h"
  39
  40 #undef DBGC_CLASS
  41 #define DBGC_CLASS DBGC_AUTH
  42
  43 /**
  44  * Return the credentials of a logged on user, including session keys
  45  * etc.
  46  *
  47  * Only valid after a successful authentication
  48  *
  49  * May only be called once per authentication.
  50  *
  51  */
  52
  53 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
  54                                      TALLOC_CTX *mem_ctx,
  55                                      struct auth_session_info **session_info)
  56 {
  57         NTSTATUS nt_status;
  58         struct gensec_ntlmssp_context *gensec_ntlmssp =
  59                 talloc_get_type_abort(gensec_security->private_data,
  60                                       struct gensec_ntlmssp_context);
  61         uint32_t session_info_flags = 0;
  62
  63         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
  64                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
  65         }
  66
  67         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
  68         session_info_flags |= AUTH_SESSION_INFO_NTLM;
  69
  70         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {
  71                 nt_status = gensec_security->auth_context->generate_session_info(gensec_security->auth_context, mem_ctx,
  72                                                                                  gensec_ntlmssp->server_returned_info,
  73                                                                                  gensec_ntlmssp->ntlmssp_state->user,
  74                                                                                  session_info_flags,
  75                                                                                  session_info);
  76         } else {
  77                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
  78                 return NT_STATUS_INTERNAL_ERROR;
  79         }
  80
  81         NT_STATUS_NOT_OK_RETURN(nt_status);
  82
  83         nt_status = gensec_ntlmssp_session_key(gensec_security, *session_info,
  84                                                &(*session_info)->session_key);
  85         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_USER_SESSION_KEY)) {
  86                 (*session_info)->session_key = data_blob_null;
  87                 nt_status = NT_STATUS_OK;
  88         }
  89
  90         return nt_status;
  91 }
  92
  93 /**
  94  * Start NTLMSSP on the server side
  95  *
  96  */
  97 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
  98 {
  99         NTSTATUS nt_status;
 100         struct ntlmssp_state *ntlmssp_state;
 101         struct gensec_ntlmssp_context *gensec_ntlmssp;
 102         const char *netbios_name;
 103         const char *netbios_domain;
 104         const char *dns_name;
 105         const char *dns_domain;
 106         enum server_role role;
 107
 108         role = lpcfg_server_role(gensec_security->settings->lp_ctx);
 109
 110         nt_status = gensec_ntlmssp_start(gensec_security);
 111         NT_STATUS_NOT_OK_RETURN(nt_status);
 112
 113         gensec_ntlmssp =
 114                 talloc_get_type_abort(gensec_security->private_data,
 115                                       struct gensec_ntlmssp_context);
 116
 117         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 118                                     struct ntlmssp_state);
 119         if (!ntlmssp_state) {
 120                 return NT_STATUS_NO_MEMORY;
 121         }
 122         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 123
 124         ntlmssp_state->role = NTLMSSP_SERVER;
 125
 126         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 127
 128         ntlmssp_state->allow_lm_response =
 129                 lpcfg_lanman_auth(gensec_security->settings->lp_ctx);
 130
 131         if (ntlmssp_state->allow_lm_response &&
 132             gensec_setting_bool(gensec_security->settings,
 133                                 "ntlmssp_server", "allow_lm_key", false))
 134         {
 135                 ntlmssp_state->allow_lm_key = true;
 136         }
 137
 138         ntlmssp_state->force_old_spnego = false;
 139
 140         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "force_old_spnego", false)) {
 141                 /*
 142                  * For testing Windows 2000 mode
 143                  */
 144                 ntlmssp_state->force_old_spnego = true;
 145         }
 146
 147         ntlmssp_state->neg_flags =
 148                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 149
 150         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 151                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 152         }
 153
 154         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 155                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 156         }
 157
 158         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 159                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 160         }
 161
 162         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 163                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 164         }
 165
 166         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 167                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 168         }
 169
 170         if (ntlmssp_state->allow_lm_key) {
 171                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 172         }
 173
 174         /*
 175          * We always allow NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL.
 176          *
 177          * These will be removed if the client doesn't want them.
 178          */
 179         ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 180         ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 181
 182
 183         if (role == ROLE_STANDALONE) {
 184                 ntlmssp_state->server.is_standalone = true;
 185         } else {
 186                 ntlmssp_state->server.is_standalone = false;
 187         }
 188
 189         if (gensec_security->settings->server_netbios_name) {
 190                 netbios_name = gensec_security->settings->server_netbios_name;
 191         } else {
 192                 netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 193         }
 194
 195         if (gensec_security->settings->server_netbios_domain) {
 196                 netbios_domain = gensec_security->settings->server_netbios_domain;
 197         } else {
 198                 netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 199         }
 200
 201         if (gensec_security->settings->server_dns_name) {
 202                 dns_name = gensec_security->settings->server_dns_name;
 203         } else {
 204                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 205                 char *lower_netbiosname;
 206
 207                 lower_netbiosname = strlower_talloc(ntlmssp_state, netbios_name);
 208                 NT_STATUS_HAVE_NO_MEMORY(lower_netbiosname);
 209
 210                 /* Find out the DNS host name */
 211                 if (dnsdomain && dnsdomain[0] != '\0') {
 212                         dns_name = talloc_asprintf(ntlmssp_state, "%s.%s",
 213                                                    lower_netbiosname,
 214                                                    dnsdomain);
 215                         talloc_free(lower_netbiosname);
 216                         NT_STATUS_HAVE_NO_MEMORY(dns_name);
 217                 } else {
 218                         dns_name = lower_netbiosname;
 219                 }
 220         }
 221
 222         if (gensec_security->settings->server_dns_domain) {
 223                 dns_domain = gensec_security->settings->server_dns_domain;
 224         } else {
 225                 dns_domain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 226         }
 227
 228         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 229         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_name);
 230
 231         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 232         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_domain);
 233
 234         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 235         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 236
 237         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 238         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 239
 240         ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
 241         ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;
 242
 243         return NT_STATUS_OK;
 244 }
 245