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                                             DATA_BLOB *user_session_key, DATA_BLOB *lm_session_key)
 153 {
 154         struct gensec_ntlmssp_context *gensec_ntlmssp =
 155                 talloc_get_type_abort(ntlmssp_state->callback_private,
 156                                       struct gensec_ntlmssp_context);
 157         struct auth_context *auth_context = gensec_ntlmssp->auth_context;
 158         NTSTATUS nt_status;
 159         struct auth_usersupplied_info *user_info;
 160
 161         user_info = talloc(ntlmssp_state, struct auth_usersupplied_info);
 162         if (!user_info) {
 163                 return NT_STATUS_NO_MEMORY;
 164         }
 165
 166         user_info->logon_parameters = MSV1_0_ALLOW_SERVER_TRUST_ACCOUNT | MSV1_0_ALLOW_WORKSTATION_TRUST_ACCOUNT;
 167         user_info->flags = 0;
 168         user_info->mapped_state = false;
 169         user_info->client.account_name = ntlmssp_state->user;
 170         user_info->client.domain_name = ntlmssp_state->domain;
 171         user_info->workstation_name = ntlmssp_state->client.netbios_name;
 172         user_info->remote_host = gensec_get_remote_address(gensec_ntlmssp->gensec_security);
 173
 174         user_info->password_state = AUTH_PASSWORD_RESPONSE;
 175         user_info->password.response.lanman = ntlmssp_state->lm_resp;
 176         user_info->password.response.lanman.data = talloc_steal(user_info, ntlmssp_state->lm_resp.data);
 177         user_info->password.response.nt = ntlmssp_state->nt_resp;
 178         user_info->password.response.nt.data = talloc_steal(user_info, ntlmssp_state->nt_resp.data);
 179
 180         nt_status = auth_context->check_password(auth_context,
 181                                                  gensec_ntlmssp,
 182                                                  user_info,
 183                                                  &gensec_ntlmssp->server_info);
 184         talloc_free(user_info);
 185         NT_STATUS_NOT_OK_RETURN(nt_status);
 186
 187         if (gensec_ntlmssp->server_info->user_session_key.length) {
 188                 DEBUG(10, ("Got NT session key of length %u\n",
 189                            (unsigned)gensec_ntlmssp->server_info->user_session_key.length));
 190                 *user_session_key = gensec_ntlmssp->server_info->user_session_key;
 191         }
 192         if (gensec_ntlmssp->server_info->lm_session_key.length) {
 193                 DEBUG(10, ("Got LM session key of length %u\n",
 194                            (unsigned)gensec_ntlmssp->server_info->lm_session_key.length));
 195                 *lm_session_key = gensec_ntlmssp->server_info->lm_session_key;
 196         }
 197         return nt_status;
 198 }
 199
 200 /**
 201  * Return the credentials of a logged on user, including session keys
 202  * etc.
 203  *
 204  * Only valid after a successful authentication
 205  *
 206  * May only be called once per authentication.
 207  *
 208  */
 209
 210 NTSTATUS gensec_ntlmssp_session_info(struct gensec_security *gensec_security,
 211                                      struct auth_session_info **session_info)
 212 {
 213         NTSTATUS nt_status;
 214         struct gensec_ntlmssp_context *gensec_ntlmssp =
 215                 talloc_get_type_abort(gensec_security->private_data,
 216                                       struct gensec_ntlmssp_context);
 217         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 218
 219         nt_status = gensec_generate_session_info(ntlmssp_state,
 220                                                  gensec_security,
 221                                                  gensec_ntlmssp->server_info,
 222                                                  session_info);
 223         NT_STATUS_NOT_OK_RETURN(nt_status);
 224
 225         (*session_info)->session_key = data_blob_talloc(*session_info,
 226                                                         ntlmssp_state->session_key.data,
 227                                                         ntlmssp_state->session_key.length);
 228
 229         return NT_STATUS_OK;
 230 }
 231
 232 /**
 233  * Start NTLMSSP on the server side
 234  *
 235  */
 236 NTSTATUS gensec_ntlmssp_server_start(struct gensec_security *gensec_security)
 237 {
 238         NTSTATUS nt_status;
 239         struct ntlmssp_state *ntlmssp_state;
 240         struct gensec_ntlmssp_context *gensec_ntlmssp;
 241
 242         nt_status = gensec_ntlmssp_start(gensec_security);
 243         NT_STATUS_NOT_OK_RETURN(nt_status);
 244
 245         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 246                                                struct gensec_ntlmssp_context);
 247         ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 248
 249         ntlmssp_state->role = NTLMSSP_SERVER;
 250
 251         ntlmssp_state->expected_state = NTLMSSP_NEGOTIATE;
 252
 253         ntlmssp_state->allow_lm_key = (lpcfg_lanman_auth(gensec_security->settings->lp_ctx)
 254                                           && gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "allow_lm_key", false));
 255
 256         ntlmssp_state->neg_flags =
 257                 NTLMSSP_NEGOTIATE_NTLM | NTLMSSP_NEGOTIATE_VERSION;
 258
 259         ntlmssp_state->lm_resp = data_blob(NULL, 0);
 260         ntlmssp_state->nt_resp = data_blob(NULL, 0);
 261
 262         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "128bit", true)) {
 263                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_128;
 264         }
 265
 266         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "56bit", true)) {
 267                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_56;
 268         }
 269
 270         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "keyexchange", true)) {
 271                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_KEY_EXCH;
 272         }
 273
 274         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "alwayssign", true)) {
 275                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_ALWAYS_SIGN;
 276         }
 277
 278         if (gensec_setting_bool(gensec_security->settings, "ntlmssp_server", "ntlm2", true)) {
 279                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_NTLM2;
 280         }
 281
 282         if (gensec_security->want_features & GENSEC_FEATURE_SIGN) {
 283                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SIGN;
 284         }
 285         if (gensec_security->want_features & GENSEC_FEATURE_SEAL) {
 286                 ntlmssp_state->neg_flags |= NTLMSSP_NEGOTIATE_SEAL;
 287         }
 288
 289         gensec_ntlmssp->auth_context = gensec_security->auth_context;
 290
 291         ntlmssp_state->get_challenge = auth_ntlmssp_get_challenge;
 292         ntlmssp_state->may_set_challenge = auth_ntlmssp_may_set_challenge;
 293         ntlmssp_state->set_challenge = auth_ntlmssp_set_challenge;
 294         ntlmssp_state->check_password = auth_ntlmssp_check_password;
 295         if (lpcfg_server_role(gensec_security->settings->lp_ctx) == ROLE_STANDALONE) {
 296                 ntlmssp_state->server.is_standalone = true;
 297         } else {
 298                 ntlmssp_state->server.is_standalone = false;
 299         }
 300
 301         ntlmssp_state->server.netbios_name = lpcfg_netbios_name(gensec_security->settings->lp_ctx);
 302
 303         ntlmssp_state->server.netbios_domain = lpcfg_workgroup(gensec_security->settings->lp_ctx);
 304
 305         {
 306                 char dnsdomname[MAXHOSTNAMELEN], dnsname[MAXHOSTNAMELEN];
 307
 308                 /* Find out the DNS domain name */
 309                 dnsdomname[0] = '\0';
 310                 safe_strcpy(dnsdomname, lpcfg_dnsdomain(gensec_security->settings->lp_ctx), sizeof(dnsdomname) - 1);
 311
 312                 /* Find out the DNS host name */
 313                 safe_strcpy(dnsname, ntlmssp_state->server.netbios_name, sizeof(dnsname) - 1);
 314                 if (dnsdomname[0] != '\0') {
 315                         safe_strcat(dnsname, ".", sizeof(dnsname) - 1);
 316                         safe_strcat(dnsname, dnsdomname, sizeof(dnsname) - 1);
 317                 }
 318                 strlower_m(dnsname);
 319
 320                 ntlmssp_state->server.dns_name = talloc_strdup(ntlmssp_state,
 321                                                                       dnsname);
 322                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_name);
 323
 324                 ntlmssp_state->server.dns_domain = talloc_strdup(ntlmssp_state,
 325                                                                         dnsdomname);
 326                 NT_STATUS_HAVE_NO_MEMORY(ntlmssp_state->server.dns_domain);
 327         }
 328
 329         return NT_STATUS_OK;
 330 }
 331