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/common_auth.h"
  35 #include "param/param.h"
  36
  37
  38 /**
  39  * Return the credentials of a logged on user, including session keys
  40  * etc.
  41  *
  42  * Only valid after a successful authentication
  43  *
  44  * May only be called once per authentication.
  45  *
  46  */
  47
  48 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
  49                                      TALLOC_CTX *mem_ctx,
  50                                      struct auth_session_info **session_info)
  51 {
  52         NTSTATUS nt_status;
  53         struct gensec_ntlmssp_context *gensec_ntlmssp =
  54                 talloc_get_type_abort(gensec_security->private_data,
  55                                       struct gensec_ntlmssp_context);
  56         uint32_t session_info_flags = 0;
  57
  58         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
  59                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
  60         }
  61
  62         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
  63
  64         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {
  65                 nt_status = gensec_security->auth_context->generate_session_info(gensec_security->auth_context, mem_ctx,
  66                                                                                  gensec_ntlmssp->server_returned_info,
  67                                                                                  gensec_ntlmssp->ntlmssp_state->user,
  68                                                                                  session_info_flags,
  69                                                                                  session_info);
  70         } else {
  71                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
  72                 return NT_STATUS_INTERNAL_ERROR;
  73         }
  74
  75         NT_STATUS_NOT_OK_RETURN(nt_status);
  76
  77         nt_status = gensec_ntlmssp_session_key(gensec_security, *session_info,
  78                                                &(*session_info)->session_key);
  79         if (NT_STATUS_EQUAL(nt_status, NT_STATUS_NO_USER_SESSION_KEY)) {
  80                 (*session_info)->session_key = data_blob_null;
  81                 nt_status = NT_STATUS_OK;
  82         }
  83
  84         return nt_status;
  85 }
  86
  87 /**
  88  * Start NTLMSSP on the server side
  89  *
  90  */
  91 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
  92 {
  93         NTSTATUS nt_status;
  94         struct ntlmssp_state *ntlmssp_state;
  95         struct gensec_ntlmssp_context *gensec_ntlmssp;
  96         const char *netbios_name;
  97         const char *netbios_domain;
  98         const char *dns_name;
  99         const char *dns_domain;
 100
 101         nt_status = gensec_ntlmssp_start(gensec_security);
 102         NT_STATUS_NOT_OK_RETURN(nt_status);
 103
 104         gensec_ntlmssp =
 105                 talloc_get_type_abort(gensec_security->private_data,
 106                                       struct gensec_ntlmssp_context);
 107
 108         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 109                                     struct ntlmssp_state);
 110         if (!ntlmssp_state) {
 111                 return NT_STATUS_NO_MEMORY;
 112         }
 113         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 114
 115         ntlmssp_state->role = NTLMSSP_SERVER;
 116
 117         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 118
 119         if (lpcfg_lanman_auth(gensec_security->settings->lp_ctx) &&
 120             gensec_setting_bool(gensec_security->settings,
 121                                 "ntlmssp_server", "allow_lm_key", false))
 122         {
 123                 ntlmssp_state->allow_lm_key = true;
 124         }
 125
 126         ntlmssp_state->neg_flags =
 127                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 128
 129         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 130                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 131         }
 132
 133         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 134                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 135         }
 136
 137         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 138                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 139         }
 140
 141         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 142                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 143         }
 144
 145         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 146                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 147         }
 148
 149         if (gensec_security->want_features & GENSEC_FEATURE_SESSION_KEY) {
 150                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 151         }
 152         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 153                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 154         }
 155         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 156                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 157                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 158         }
 159
 160         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 161                 ntlmssp_state->server.is_standalone = true;
 162         } else {
 163                 ntlmssp_state->server.is_standalone = false;
 164         }
 165
 166         if (gensec_security->settings->server_netbios_name) {
 167                 netbios_name = gensec_security->settings->server_netbios_name;
 168         } else {
 169                 netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 170         }
 171
 172         if (gensec_security->settings->server_netbios_domain) {
 173                 netbios_domain = gensec_security->settings->server_netbios_domain;
 174         } else {
 175                 netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 176         }
 177
 178         if (gensec_security->settings->server_dns_name) {
 179                 dns_name = gensec_security->settings->server_dns_name;
 180         } else {
 181                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 182                 char *lower_netbiosname;
 183
 184                 lower_netbiosname = strlower_talloc(ntlmssp_state, netbios_name);
 185                 NT_STATUS_HAVE_NO_MEMORY(lower_netbiosname);
 186
 187                 /* Find out the DNS host name */
 188                 if (dnsdomain && dnsdomain[0] != '\0') {
 189                         dns_name = talloc_asprintf(ntlmssp_state, "%s.%s",
 190                                                    lower_netbiosname,
 191                                                    dnsdomain);
 192                         talloc_free(lower_netbiosname);
 193                         NT_STATUS_HAVE_NO_MEMORY(dns_name);
 194                 } else {
 195                         dns_name = lower_netbiosname;
 196                 }
 197         }
 198
 199         if (gensec_security->settings->server_dns_domain) {
 200                 dns_domain = gensec_security->settings->server_dns_domain;
 201         } else {
 202                 dns_domain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 203         }
 204
 205         ntlmssp_state->server.netbios_name = talloc_strdup(ntlmssp_state, netbios_name);
 206         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_name);
 207
 208         ntlmssp_state->server.netbios_domain = talloc_strdup(ntlmssp_state, netbios_domain);
 209         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.netbios_domain);
 210
 211         ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state, dns_name);
 212         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 213
 214         ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state, dns_domain);
 215         NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 216
 217         return NT_STATUS_OK;
 218 }
 219