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 /**
  41  * Return the credentials of a logged on user, including session keys
  42  * etc.
  43  *
  44  * Only valid after a successful authentication
  45  *
  46  * May only be called once per authentication.
  47  *
  48  */
  49
  50 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
  51                                      TALLOC_CTX *mem_ctx,
  52                                      struct auth_session_info **session_info)
  53 {
  54         NTSTATUS nt_status;
  55         struct gensec_ntlmssp_context *gensec_ntlmssp =
  56                 talloc_get_type_abort(gensec_security->private_data,
  57                                       struct gensec_ntlmssp_context);
  58         uint32_t session_info_flags = 0;
  59
  60         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
  61                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
  62         }
  63
  64         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
  65         session_info_flags |= AUTH_SESSION_INFO_NTLM;
  66
  67         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {
  68                 nt_status = gensec_security->auth_context->generate_session_info(gensec_security->auth_context, mem_ctx,
  69                                                                                  gensec_ntlmssp->server_returned_info,
  70                                                                                  gensec_ntlmssp->ntlmssp_state->user,
  71                                                                                  session_info_flags,
  72                                                                                  session_info);
  73         } else {
  74                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
  75                 return NT_STATUS_INTERNAL_ERROR;
  76         }
  77
  78         NT_STATUS_NOT_OK_RETURN(nt_status);
  79
  80         nt_status = gensec_ntlmssp_session_key(gensec_security, *session_info,
  81                                                &(*session_info)->session_key);
  82         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_USER_SESSION_KEY)) {
  83                 (*session_info)->session_key = data_blob_null;
  84                 nt_status = NT_STATUS_OK;
  85         }
  86
  87         return nt_status;
  88 }
  89
  90 /**
  91  * Start NTLMSSP on the server side
  92  *
  93  */
  94 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
  95 {
  96         NTSTATUS nt_status;
  97         struct ntlmssp_state *ntlmssp_state;
  98         struct gensec_ntlmssp_context *gensec_ntlmssp;
  99         const char *netbios_name;
 100         const char *netbios_domain;
 101         const char *dns_name;
 102         const char *dns_domain;
 103         enum server_role role;
 104
 105         role = lpcfg_server_role(gensec_security->settings->lp_ctx);
 106
 107         nt_status = gensec_ntlmssp_start(gensec_security);
 108         NT_STATUS_NOT_OK_RETURN(nt_status);
 109
 110         gensec_ntlmssp =
 111                 talloc_get_type_abort(gensec_security->private_data,
 112                                       struct gensec_ntlmssp_context);
 113
 114         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 115                                     struct ntlmssp_state);
 116         if (!ntlmssp_state) {
 117                 return NT_STATUS_NO_MEMORY;
 118         }
 119         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 120
 121         ntlmssp_state->role = NTLMSSP_SERVER;
 122
 123         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 124
 125         ntlmssp_state->allow_lm_response =
 126                 lpcfg_lanman_auth(gensec_security->settings->lp_ctx);
 127
 128         if (ntlmssp_state->allow_lm_response &&
 129             gensec_setting_bool(gensec_security->settings,
 130                                 "ntlmssp_server", "allow_lm_key", false))
 131         {
 132                 ntlmssp_state->allow_lm_key = true;
 133         }
 134
 135         ntlmssp_state->force_old_spnego = false;
 136
 137         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "force_old_spnego", false)) {
 138                 /*
 139                  * For testing Windows 2000 mode
 140                  */
 141                 ntlmssp_state->force_old_spnego = true;
 142         }
 143
 144         ntlmssp_state->neg_flags =
 145                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 146
 147         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 148                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 149         }
 150
 151         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 152                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 153         }
 154
 155         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 156                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 157         }
 158
 159         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 160                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 161         }
 162
 163         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 164                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 165         }
 166
 167         if (ntlmssp_state->allow_lm_key) {
 168                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 169         }
 170
 171         /*
 172          * We always allow NTLMSSP_NEGOTIATE_SIGN and NTLMSSP_NEGOTIATE_SEAL.
 173          *
 174          * These will be removed if the client doesn't want them.
 175          */
 176         ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 177         ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 178
 179         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 180                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 181         }
 182         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 183                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 184
 185                 if (gensec_security->want_features & GENSEC_FEATURE_LDAP_STYLE) {
 186                         /*
 187                          * We need to handle NTLMSSP_NEGOTIATE_SIGN as
 188                          * NTLMSSP_NEGOTIATE_SEAL if GENSEC_FEATURE_LDAP_STYLE
 189                          * is requested.
 190                          */
 191                         ntlmssp_state->force_wrap_seal = true;
 192                 }
 193         }
 194         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 195                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 196                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 197         }
 198
 199         if (role == ROLE_STANDALONE) {
 200                 ntlmssp_state->server.is_standalone = true;
 201         } else {
 202                 ntlmssp_state->server.is_standalone = false;
 203         }
 204
 205         if (gensec_security->settings->server_netbios_name) {
 206                 netbios_name = gensec_security->settings->server_netbios_name;
 207         } else {
 208                 netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 209         }
 210
 211         if (gensec_security->settings->server_netbios_domain) {
 212                 netbios_domain = gensec_security->settings->server_netbios_domain;
 213         } else {
 214                 netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 215         }
 216
 217         if (gensec_security->settings->server_dns_name) {
 218                 dns_name = gensec_security->settings->server_dns_name;
 219         } else {
 220                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 221                 char *lower_netbiosname;
 222
 223                 lower_netbiosname = strlower_talloc(ntlmssp_state, netbios_name);
 224                 NT_STATUS_HAVE_NO_MEMORY(lower_netbiosname);
 225
 226                 /* Find out the DNS host name */
 227                 if (dnsdomain && dnsdomain[0] != '\0') {
 228                         dns_name = talloc_asprintf(ntlmssp_state, "%s.%s",
 229                                                    lower_netbiosname,
 230                                                    dnsdomain);
 231                         talloc_free(lower_netbiosname);
 232                         NT_STATUS_HAVE_NO_MEMORY(dns_name);
 233                 } else {
 234                         dns_name = lower_netbiosname;
 235                 }
 236         }
 237
 238         if (gensec_security->settings->server_dns_domain) {
 239                 dns_domain = gensec_security->settings->server_dns_domain;
 240         } else {
 241                 dns_domain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 242         }
 243
 244         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 245         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_name);
 246
 247         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 248         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_domain);
 249
 250         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 251         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 252
 253         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 254         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 255
 256         ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
 257         ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;
 258
 259         return NT_STATUS_OK;
 260 }
 261