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
  39 /**
  40  * Return the credentials of a logged on user, including session keys
  41  * etc.
  42  *
  43  * Only valid after a successful authentication
  44  *
  45  * May only be called once per authentication.
  46  *
  47  */
  48
  49 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
  50                                      TALLOC_CTX *mem_ctx,
  51                                      struct auth_session_info **session_info)
  52 {
  53         NTSTATUS nt_status;
  54         struct gensec_ntlmssp_context *gensec_ntlmssp =
  55                 talloc_get_type_abort(gensec_security->private_data,
  56                                       struct gensec_ntlmssp_context);
  57         uint32_t session_info_flags = 0;
  58
  59         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
  60                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
  61         }
  62
  63         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
  64
  65         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {
  66                 nt_status = gensec_security->auth_context->generate_session_info(gensec_security->auth_context, mem_ctx,
  67                                                                                  gensec_ntlmssp->server_returned_info,
  68                                                                                  gensec_ntlmssp->ntlmssp_state->user,
  69                                                                                  session_info_flags,
  70                                                                                  session_info);
  71         } else {
  72                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
  73                 return NT_STATUS_INTERNAL_ERROR;
  74         }
  75
  76         NT_STATUS_NOT_OK_RETURN(nt_status);
  77
  78         nt_status = gensec_ntlmssp_session_key(gensec_security, *session_info,
  79                                                &(*session_info)->session_key);
  80         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_USER_SESSION_KEY)) {
  81                 (*session_info)->session_key = data_blob_null;
  82                 nt_status = NT_STATUS_OK;
  83         }
  84
  85         return nt_status;
  86 }
  87
  88 /**
  89  * Start NTLMSSP on the server side
  90  *
  91  */
  92 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
  93 {
  94         NTSTATUS nt_status;
  95         struct ntlmssp_state *ntlmssp_state;
  96         struct gensec_ntlmssp_context *gensec_ntlmssp;
  97         const char *netbios_name;
  98         const char *netbios_domain;
  99         const char *dns_name;
 100         const char *dns_domain;
 101         enum server_role role;
 102
 103         role = lpcfg_server_role(gensec_security->settings->lp_ctx);
 104
 105         nt_status = gensec_ntlmssp_start(gensec_security);
 106         NT_STATUS_NOT_OK_RETURN(nt_status);
 107
 108         gensec_ntlmssp =
 109                 talloc_get_type_abort(gensec_security->private_data,
 110                                       struct gensec_ntlmssp_context);
 111
 112         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 113                                     struct ntlmssp_state);
 114         if (!ntlmssp_state) {
 115                 return NT_STATUS_NO_MEMORY;
 116         }
 117         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 118
 119         ntlmssp_state->role = NTLMSSP_SERVER;
 120
 121         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 122
 123         ntlmssp_state->allow_lm_response =
 124                 lpcfg_lanman_auth(gensec_security->settings->lp_ctx);
 125
 126         if (ntlmssp_state->allow_lm_response &&
 127             gensec_setting_bool(gensec_security->settings,
 128                                 "ntlmssp_server", "allow_lm_key", false))
 129         {
 130                 ntlmssp_state->allow_lm_key = true;
 131         }
 132
 133         ntlmssp_state->force_old_spnego = false;
 134
 135         ntlmssp_state->neg_flags =
 136                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 137
 138         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 139                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 140         }
 141
 142         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 143                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 144         }
 145
 146         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 147                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 148         }
 149
 150         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 151                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 152         }
 153
 154         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 155                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 156         }
 157
 158         if (ntlmssp_state->allow_lm_key) {
 159                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_LM_KEY;
 160         }
 161
 162         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 163                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 164         }
 165         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 166                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 167
 168                 if (gensec_security->want_features & GENSEC_FEATURE_LDAP_STYLE) {
 169                         /*
 170                          * We need to handle NTLMSSP_NEGOTIATE_SIGN as
 171                          * NTLMSSP_NEGOTIATE_SEAL if GENSEC_FEATURE_LDAP_STYLE
 172                          * is requested.
 173                          */
 174                         ntlmssp_state->force_wrap_seal = true;
 175                 }
 176         }
 177         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 178                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 179                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 180         }
 181
 182         if (role == ROLE_STANDALONE) {
 183                 ntlmssp_state->server.is_standalone = true;
 184         } else {
 185                 ntlmssp_state->server.is_standalone = false;
 186         }
 187
 188         if (gensec_security->settings->server_netbios_name) {
 189                 netbios_name = gensec_security->settings->server_netbios_name;
 190         } else {
 191                 netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 192         }
 193
 194         if (gensec_security->settings->server_netbios_domain) {
 195                 netbios_domain = gensec_security->settings->server_netbios_domain;
 196         } else {
 197                 netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 198         }
 199
 200         if (gensec_security->settings->server_dns_name) {
 201                 dns_name = gensec_security->settings->server_dns_name;
 202         } else {
 203                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 204                 char *lower_netbiosname;
 205
 206                 lower_netbiosname = strlower_talloc(ntlmssp_state, netbios_name);
 207                 NT_STATUS_HAVE_NO_MEMORY(lower_netbiosname);
 208
 209                 /* Find out the DNS host name */
 210                 if (dnsdomain && dnsdomain[0] != '\0') {
 211                         dns_name = talloc_asprintf(ntlmssp_state, "%s.%s",
 212                                                    lower_netbiosname,
 213                                                    dnsdomain);
 214                         talloc_free(lower_netbiosname);
 215                         NT_STATUS_HAVE_NO_MEMORY(dns_name);
 216                 } else {
 217                         dns_name = lower_netbiosname;
 218                 }
 219         }
 220
 221         if (gensec_security->settings->server_dns_domain) {
 222                 dns_domain = gensec_security->settings->server_dns_domain;
 223         } else {
 224                 dns_domain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 225         }
 226
 227         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 228         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_name);
 229
 230         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 231         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_domain);
 232
 233         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 234         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 235
 236         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 237         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 238
 239         ntlmssp_state->neg_flags |= ntlmssp_state->required_flags;
 240         ntlmssp_state->conf_flags = ntlmssp_state->neg_flags;
 241
 242         return NT_STATUS_OK;
 243 }
 244