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