source4/auth/ntlmssp/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 "../libcli/auth/ntlmssp_ndr.h"
  30 #include "../libcli/auth/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_proto.h"
  35 #include "auth/auth.h"
  36 #include "param/param.h"
  37
  38 /**
  39  * Next state function for the Negotiate packet (GENSEC wrapper)
  40  *
  41  * @param gensec_security GENSEC state
  42  * @param out_mem_ctx Memory context for *out
  43  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  44  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  45  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  46  */
  47
  48 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  49                                          TALLOC_CTX *out_mem_ctx,
  50                                          const DATA_BLOB request, DATA_BLOB *reply)
  51 {
  52         struct gensec_ntlmssp_context *gensec_ntlmssp =
  53                 talloc_get_type_abort(gensec_security->private_data,
  54                                       struct gensec_ntlmssp_context);
  55         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  56         return ntlmssp_server_negotiate(ntlmssp_state, out_mem_ctx, request, reply);
  57 }
  58
  59 /**
  60  * Next state function for the Authenticate packet (GENSEC wrapper)
  61  *
  62  * @param gensec_security GENSEC state
  63  * @param out_mem_ctx Memory context for *out
  64  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  65  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  66  * @return Errors or NT_STATUS_OK if authentication sucessful
  67  */
  68
  69 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
  70                                     TALLOC_CTX *out_mem_ctx,
  71                                     const DATA_BLOB in, DATA_BLOB *out)
  72 {
  73         struct gensec_ntlmssp_context *gensec_ntlmssp =
  74                 talloc_get_type_abort(gensec_security->private_data,
  75                                       struct gensec_ntlmssp_context);
  76         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  77         return ntlmssp_server_auth(ntlmssp_state, out_mem_ctx, in, out);
  78 }
  79
  80 /**
  81  * Return the challenge as determined by the authentication subsystem
  82  * @return an 8 byte random challenge
  83  */
  84
  85 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  86                                            uint8_t chal[8])
  87 {
  88         struct gensec_ntlmssp_context *gensec_ntlmssp =
  89                 talloc_get_type_abort(ntlmssp_state->callback_private,
  90                                       struct gensec_ntlmssp_context);
  91         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
  92         NTSTATUS status;
  93
  94         status = auth_context->get_challenge(auth_context, chal);
  95         if (!NT_STATUS_IS_OK(status)) {
  96                 DEBUG(1, ("auth_ntlmssp_get_challenge: failed to get challenge: %s\n",
  97                         nt_errstr(status)));
  98                 return status;
  99         }
 100
 101         return NT_STATUS_OK;
 102 }
 103
 104 /**
 105  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 106  *
 107  * @return If the effective challenge used by the auth subsystem may be modified
 108  */
 109 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 110 {
 111         struct gensec_ntlmssp_context *gensec_ntlmssp =
 112                 talloc_get_type_abort(ntlmssp_state->callback_private,
 113                                       struct gensec_ntlmssp_context);
 114         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 115
 116         return auth_context->challenge_may_be_modified(auth_context);
 117 }
 118
 119 /**
 120  * NTLM2 authentication modifies the effective challenge,
 121  * @param challenge The new challenge value
 122  */
 123 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 124 {
 125         struct gensec_ntlmssp_context *gensec_ntlmssp =
 126                 talloc_get_type_abort(ntlmssp_state->callback_private,
 127                                       struct gensec_ntlmssp_context);
 128         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 129         NTSTATUS nt_status;
 130         const uint8_t *chal;
 131
 132         if (challenge->length != 8) {
 133                 return NT_STATUS_INVALID_PARAMETER;
 134         }
 135
 136         chal = challenge->data;
 137
 138         nt_status = auth_context->set_challenge(auth_context,
 139                                                 chal,
 140                                                 "NTLMSSP callback (NTLM2)");
 141
 142         return nt_status;
 143 }
 144
 145 /**
 146  * Check the password on an NTLMSSP login.
 147  *
 148  * Return the session keys used on the connection.
 149  */
 150
 151 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
 152                                             TALLOC_CTX *mem_ctx,
 153                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 154 {
 155         struct gensec_ntlmssp_context *gensec_ntlmssp =
 156                 talloc_get_type_abort(ntlmssp_state->callback_private,
 157                                       struct gensec_ntlmssp_context);
 158         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 159         NTSTATUS nt_status;
 160         struct auth_usersupplied_info *user_info;
 161
 162         user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
 163         if (!user_info) {
 164                 return NT_STATUS_NO_MEMORY;
 165         }
 166
 167         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 168         user_info->flags = 0;
 169         user_info->mapped_state = false;
 170         user_info->client.account_name = ntlmssp_state->user;
 171         user_info->client.domain_name = ntlmssp_state->domain;
 172         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 173         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 174
 175         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 176         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 177         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 178         user_info->password.response.nt = ntlmssp_state->nt_resp;
 179         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 180
 181         nt_status = auth_context->check_password(auth_context,
 182                                                  gensec_ntlmssp,
 183                                                  user_info,
 184                                                  &gensec_ntlmssp->user_info_dc);
 185         talloc_free(user_info);
 186         NT_STATUS_NOT_OK_RETURN(nt_status);
 187
 188         if (gensec_ntlmssp->user_info_dc->user_session_key.length) {
 189                 DEBUG(10, ("Got NT session key of length %u\n",
 190                            (unsigned)gensec_ntlmssp->user_info_dc->user_session_key.length));
 191                 *user_session_key = gensec_ntlmssp->user_info_dc->user_session_key;
 192                 talloc_steal(mem_ctx, user_session_key->data);
 193                 gensec_ntlmssp->user_info_dc->user_session_key = data_blob_null;
 194         }
 195         if (gensec_ntlmssp->user_info_dc->lm_session_key.length) {
 196                 DEBUG(10, ("Got LM session key of length %u\n",
 197                            (unsigned)gensec_ntlmssp->user_info_dc->lm_session_key.length));
 198                 *lm_session_key = gensec_ntlmssp->user_info_dc->lm_session_key;
 199                 talloc_steal(mem_ctx, lm_session_key->data);
 200                 gensec_ntlmssp->user_info_dc->lm_session_key = data_blob_null;
 201         }
 202         return nt_status;
 203 }
 204
 205 /**
 206  * Return the credentials of a logged on user, including session keys
 207  * etc.
 208  *
 209  * Only valid after a successful authentication
 210  *
 211  * May only be called once per authentication.
 212  *
 213  */
 214
 215 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 216                                      TALLOC_CTX *mem_ctx,
 217                                      struct auth_session_info **session_info)
 218 {
 219         NTSTATUS nt_status;
 220         struct gensec_ntlmssp_context *gensec_ntlmssp =
 221                 talloc_get_type_abort(gensec_security->private_data,
 222                                       struct gensec_ntlmssp_context);
 223         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 224
 225         nt_status = gensec_generate_session_info(mem_ctx,
 226                                                  gensec_security,
 227                                                  gensec_ntlmssp->user_info_dc,
 228                                                  session_info);
 229         NT_STATUS_NOT_OK_RETURN(nt_status);
 230
 231         return gensec_ntlmssp_session_key(gensec_security, *session_info,
 232                                           &(*session_info)->session_key);
 233 }
 234
 235 /**
 236  * Start NTLMSSP on the server side
 237  *
 238  */
 239 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 240 {
 241         NTSTATUS nt_status;
 242         struct ntlmssp_state *ntlmssp_state;
 243         struct gensec_ntlmssp_context *gensec_ntlmssp;
 244
 245         nt_status = gensec_ntlmssp_start(gensec_security);
 246         NT_STATUS_NOT_OK_RETURN(nt_status);
 247
 248         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 249                                                struct gensec_ntlmssp_context);
 250         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 251
 252         ntlmssp_state->role = NTLMSSP_SERVER;
 253
 254         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 255
 256         ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
 257                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 258
 259         ntlmssp_state->neg_flags =
 260                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 261
 262         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 263         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 264
 265         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 266                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 267         }
 268
 269         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 270                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 271         }
 272
 273         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 274                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 275         }
 276
 277         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 278                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 279         }
 280
 281         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 282                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 283         }
 284
 285         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 286                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 287         }
 288         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 289                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 290         }
 291
 292         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 293         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 294         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 295         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 296         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 297                 ntlmssp_state->server.is_standalone = true;
 298         } else {
 299                 ntlmssp_state->server.is_standalone = false;
 300         }
 301
 302         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 303
 304         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 305
 306         {
 307                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 308                 char *dnsname, *lower_netbiosname;
 309                 lower_netbiosname = strlower_talloc(ntlmssp_state, ntlmssp_state->server.netbios_name);
 310
 311                 /* Find out the DNS host name */
 312                 if (dnsdomain && dnsdomain[0] != '\0') {
 313                         dnsname = talloc_asprintf(ntlmssp_state, "%s.%s",
 314                                                   lower_netbiosname,
 315                                                   dnsdomain);
 316                         talloc_free(lower_netbiosname);
 317                         ntlmssp_state->server.dns_name = dnsname;
 318                 } else {
 319                         ntlmssp_state->server.dns_name = lower_netbiosname;
 320                 }
 321
 322                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 323
 324                 ntlmssp_state->server.dns_domain
 325                         = talloc_strdup(ntlmssp_state,
 326                                         lpcfg_dnsdomain(gensec_security->settings->lp_ctx));
 327                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 328         }
 329
 330         return NT_STATUS_OK;
 331 }
 332