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  * Next state function for the Negotiate packet (GENSEC wrapper)
  39  *
  40  * @param gensec_security GENSEC state
  41  * @param out_mem_ctx Memory context for *out
  42  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  43  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  44  * @return Errors or MORE_PROCESSING_REQUIRED if (normal) a reply is required.
  45  */
  46
  47 NTSTATUS gensec_ntlmssp_server_negotiate(struct gensec_security *gensec_security,
  48                                          TALLOC_CTX *out_mem_ctx,
  49                                          const DATA_BLOB request, DATA_BLOB *reply)
  50 {
  51         struct gensec_ntlmssp_context *gensec_ntlmssp =
  52                 talloc_get_type_abort(gensec_security->private_data,
  53                                       struct gensec_ntlmssp_context);
  54         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  55         return ntlmssp_server_negotiate(ntlmssp_state, out_mem_ctx, request, reply);
  56 }
  57
  58 /**
  59  * Next state function for the Authenticate packet (GENSEC wrapper)
  60  *
  61  * @param gensec_security GENSEC state
  62  * @param out_mem_ctx Memory context for *out
  63  * @param in The request, as a DATA_BLOB.  reply.data must be NULL
  64  * @param out The reply, as an allocated DATA_BLOB, caller to free.
  65  * @return Errors or NT_STATUS_OK if authentication sucessful
  66  */
  67
  68 NTSTATUS gensec_ntlmssp_server_auth(struct gensec_security *gensec_security,
  69                                     TALLOC_CTX *out_mem_ctx,
  70                                     const DATA_BLOB in, DATA_BLOB *out)
  71 {
  72         struct gensec_ntlmssp_context *gensec_ntlmssp =
  73                 talloc_get_type_abort(gensec_security->private_data,
  74                                       struct gensec_ntlmssp_context);
  75         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
  76         return ntlmssp_server_auth(ntlmssp_state, out_mem_ctx, in, out);
  77 }
  78
  79 /**
  80  * Return the challenge as determined by the authentication subsystem
  81  * @return an 8 byte random challenge
  82  */
  83
  84 static NTSTATUS auth_ntlmssp_get_challenge(const struct ntlmssp_state *ntlmssp_state,
  85                                            uint8_t chal[8])
  86 {
  87         struct gensec_ntlmssp_context *gensec_ntlmssp =
  88                 talloc_get_type_abort(ntlmssp_state->callback_private,
  89                                       struct gensec_ntlmssp_context);
  90         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
  91         NTSTATUS status = NT_STATUS_NOT_IMPLEMENTED;
  92
  93         if (auth_context->get_challenge) {
  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
 102         return status;
 103 }
 104
 105 /**
 106  * Some authentication methods 'fix' the challenge, so we may not be able to set it
 107  *
 108  * @return If the effective challenge used by the auth subsystem may be modified
 109  */
 110 static bool auth_ntlmssp_may_set_challenge(const struct ntlmssp_state *ntlmssp_state)
 111 {
 112         struct gensec_ntlmssp_context *gensec_ntlmssp =
 113                 talloc_get_type_abort(ntlmssp_state->callback_private,
 114                                       struct gensec_ntlmssp_context);
 115         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 116
 117         if (auth_context->challenge_may_be_modified) {
 118                 return auth_context->challenge_may_be_modified(auth_context);
 119         }
 120         return false;
 121 }
 122
 123 /**
 124  * NTLM2 authentication modifies the effective challenge,
 125  * @param challenge The new challenge value
 126  */
 127 static NTSTATUS auth_ntlmssp_set_challenge(struct ntlmssp_state *ntlmssp_state, DATA_BLOB *challenge)
 128 {
 129         struct gensec_ntlmssp_context *gensec_ntlmssp =
 130                 talloc_get_type_abort(ntlmssp_state->callback_private,
 131                                       struct gensec_ntlmssp_context);
 132         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 133         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 134         const uint8_t *chal;
 135
 136         if (challenge->length != 8) {
 137                 return NT_STATUS_INVALID_PARAMETER;
 138         }
 139
 140         chal = challenge->data;
 141
 142         if (auth_context->set_challenge) {
 143                 nt_status = auth_context->set_challenge(auth_context,
 144                                                         chal,
 145                                                         "NTLMSSP callback (NTLM2)");
 146         }
 147         return nt_status;
 148 }
 149
 150 /**
 151  * Check the password on an NTLMSSP login.
 152  *
 153  * Return the session keys used on the connection.
 154  */
 155
 156 static NTSTATUS auth_ntlmssp_check_password(struct ntlmssp_state *ntlmssp_state,
 157                                             TALLOC_CTX *mem_ctx,
 158                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 159 {
 160         struct gensec_ntlmssp_context *gensec_ntlmssp =
 161                 talloc_get_type_abort(ntlmssp_state->callback_private,
 162                                       struct gensec_ntlmssp_context);
 163         struct auth4_context *auth_context = gensec_ntlmssp->gensec_security->auth_context;
 164         NTSTATUS nt_status = NT_STATUS_NOT_IMPLEMENTED;
 165         struct auth_usersupplied_info *user_info;
 166
 167         user_info = talloc_zero(ntlmssp_state, struct auth_usersupplied_info);
 168         if (!user_info) {
 169                 return NT_STATUS_NO_MEMORY;
 170         }
 171
 172         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 173         user_info->flags = 0;
 174         user_info->mapped_state = false;
 175         user_info->client.account_name = ntlmssp_state->user;
 176         user_info->client.domain_name = ntlmssp_state->domain;
 177         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 178         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 179
 180         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 181         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 182         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 183         user_info->password.response.nt = ntlmssp_state->nt_resp;
 184         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 185
 186         if (auth_context->check_password) {
 187                 nt_status = auth_context->check_password(auth_context,
 188                                                          gensec_ntlmssp,
 189                                                          user_info,
 190                                                          &gensec_ntlmssp->server_returned_info,
 191                                                          user_session_key, lm_session_key);
 192         }
 193         talloc_free(user_info);
 194         NT_STATUS_NOT_OK_RETURN(nt_status);
 195
 196         talloc_steal(mem_ctx, user_session_key->data);
 197         talloc_steal(mem_ctx, lm_session_key->data);
 198
 199         return nt_status;
 200 }
 201
 202 /**
 203  * Return the credentials of a logged on user, including session keys
 204  * etc.
 205  *
 206  * Only valid after a successful authentication
 207  *
 208  * May only be called once per authentication.
 209  *
 210  */
 211
 212 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 213                                      TALLOC_CTX *mem_ctx,
 214                                      struct auth_session_info **session_info)
 215 {
 216         NTSTATUS nt_status;
 217         struct gensec_ntlmssp_context *gensec_ntlmssp =
 218                 talloc_get_type_abort(gensec_security->private_data,
 219                                       struct gensec_ntlmssp_context);
 220         uint32_t session_info_flags = 0;
 221
 222         if (gensec_security->want_features & GENSEC_FEATURE_UNIX_TOKEN) {
 223                 session_info_flags |= AUTH_SESSION_INFO_UNIX_TOKEN;
 224         }
 225
 226         session_info_flags |= AUTH_SESSION_INFO_DEFAULT_GROUPS;
 227
 228         if (gensec_security->auth_context && gensec_security->auth_context->generate_session_info) {
 229                 nt_status = gensec_security->auth_context->generate_session_info(mem_ctx, gensec_security->auth_context,
 230                                                                                  gensec_ntlmssp->server_returned_info,
 231                                                                                  gensec_ntlmssp->ntlmssp_state->user,
 232                                                                                  session_info_flags,
 233                                                                                  session_info);
 234         } else {
 235                 DEBUG(0, ("Cannot generate a session_info without the auth_context\n"));
 236                 return NT_STATUS_INTERNAL_ERROR;
 237         }
 238
 239         NT_STATUS_NOT_OK_RETURN(nt_status);
 240
 241         return gensec_ntlmssp_session_key(gensec_security, *session_info,
 242                                           &(*session_info)->session_key);
 243 }
 244
 245 /**
 246  * Start NTLMSSP on the server side
 247  *
 248  */
 249 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 250 {
 251         NTSTATUS nt_status;
 252         struct ntlmssp_state *ntlmssp_state;
 253         struct gensec_ntlmssp_context *gensec_ntlmssp;
 254
 255         nt_status = gensec_ntlmssp_start(gensec_security);
 256         NT_STATUS_NOT_OK_RETURN(nt_status);
 257
 258         gensec_ntlmssp =
 259                 talloc_get_type_abort(gensec_security->private_data,
 260                                       struct gensec_ntlmssp_context);
 261
 262         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 263                                     struct ntlmssp_state);
 264         if (!ntlmssp_state) {
 265                 return NT_STATUS_NO_MEMORY;
 266         }
 267
 268         ntlmssp_state->callback_private = gensec_ntlmssp;
 269
 270         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 271
 272         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 273
 274         ntlmssp_state->role = NTLMSSP_SERVER;
 275
 276         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 277
 278         ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
 279                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 280
 281         ntlmssp_state->neg_flags =
 282                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 283
 284         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 285         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 286
 287         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 288                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 289         }
 290
 291         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 292                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 293         }
 294
 295         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 296                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 297         }
 298
 299         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 300                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 301         }
 302
 303         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 304                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 305         }
 306
 307         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 308                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 309         }
 310         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 311                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 312                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 313         }
 314
 315         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 316         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 317         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 318         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 319         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 320                 ntlmssp_state->server.is_standalone = true;
 321         } else {
 322                 ntlmssp_state->server.is_standalone = false;
 323         }
 324
 325         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 326
 327         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 328
 329         {
 330                 const char *dnsdomain = lpcfg_dnsdomain(gensec_security->settings->lp_ctx);
 331                 char *dnsname, *lower_netbiosname;
 332                 lower_netbiosname = strlower_talloc(ntlmssp_state, ntlmssp_state->server.netbios_name);
 333
 334                 /* Find out the DNS host name */
 335                 if (dnsdomain && dnsdomain[0] != '\0') {
 336                         dnsname = talloc_asprintf(ntlmssp_state, "%s.%s",
 337                                                   lower_netbiosname,
 338                                                   dnsdomain);
 339                         talloc_free(lower_netbiosname);
 340                         ntlmssp_state->server.dns_name = dnsname;
 341                 } else {
 342                         ntlmssp_state->server.dns_name = lower_netbiosname;
 343                 }
 344
 345                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 346
 347                 ntlmssp_state->server.dns_domain
 348                         = talloc_strdup(ntlmssp_state,
 349                                         lpcfg_dnsdomain(gensec_security->settings->lp_ctx));
 350                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 351         }
 352
 353         return NT_STATUS_OK;
 354 }