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 auth_context *auth_context = gensec_ntlmssp->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 auth_context *auth_context = gensec_ntlmssp->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 auth_context *auth_context = gensec_ntlmssp->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 auth_context *auth_context = gensec_ntlmssp->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                                      struct auth_session_info **session_info)
 217 {
 218         NTSTATUS nt_status;
 219         struct gensec_ntlmssp_context *gensec_ntlmssp =
 220                 talloc_get_type_abort(gensec_security->private_data,
 221                                       struct gensec_ntlmssp_context);
 222         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 223
 224         nt_status = gensec_generate_session_info(ntlmssp_state,
 225                                                  gensec_security,
 226                                                  gensec_ntlmssp->user_info_dc,
 227                                                  session_info);
 228         NT_STATUS_NOT_OK_RETURN(nt_status);
 229
 230         (*session_info)->session_key = data_blob_talloc(*session_info,
 231                                                         ntlmssp_state->session_key.data,
 232                                                         ntlmssp_state->session_key.length);
 233
 234         return NT_STATUS_OK;
 235 }
 236
 237 /**
 238  * Start NTLMSSP on the server side
 239  *
 240  */
 241 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 242 {
 243         NTSTATUS nt_status;
 244         struct ntlmssp_state *ntlmssp_state;
 245         struct gensec_ntlmssp_context *gensec_ntlmssp;
 246
 247         nt_status = gensec_ntlmssp_start(gensec_security);
 248         NT_STATUS_NOT_OK_RETURN(nt_status);
 249
 250         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 251                                                struct gensec_ntlmssp_context);
 252         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 253
 254         ntlmssp_state->role = NTLMSSP_SERVER;
 255
 256         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 257
 258         ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
 259                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 260
 261         ntlmssp_state->neg_flags =
 262                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 263
 264         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 265         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 266
 267         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 268                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 269         }
 270
 271         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 272                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 273         }
 274
 275         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 276                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 277         }
 278
 279         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 280                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 281         }
 282
 283         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 284                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 285         }
 286
 287         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 288                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 289         }
 290         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 291                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 292         }
 293
 294         gensec_ntlmssp->auth_context = gensec_security->auth_context;
 295
 296         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 297         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 298         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 299         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 300         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 301                 ntlmssp_state->server.is_standalone = true;
 302         } else {
 303                 ntlmssp_state->server.is_standalone = false;
 304         }
 305
 306         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 307
 308         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 309
 310         {
 311                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 312
 313                 /* Find out the DNS domain name */
 314                 dnsdomname[0] = '\0';
 315                 safe_strcpy(dnsdomname, lpcfg_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 316
 317                 /* Find out the DNS host name */
 318                 safe_strcpy(dnsname, ntlmssp_state->server.netbios_name, sizeof(dnsname) - 1);
 319                 if (dnsdomname[0] != '\0') {
 320                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 321                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 322                 }
 323                 strlower_m(dnsname);
 324
 325                 ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state,
 326                                                                       dnsname);
 327                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 328
 329                 ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state,
 330                                                                         dnsdomname);
 331                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 332         }
 333
 334         return NT_STATUS_OK;
 335 }
 336