source4/auth/ntlmssp/ntlmssp.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 "auth/ntlmssp/ntlmssp.h"
  26 #include "../libcli/auth/libcli_auth.h"
  27 #include "librpc/gen_ndr/ndr_dcerpc.h"
  28 #include "auth/gensec/gensec.h"
  29 #include "auth/gensec/gensec_proto.h"
  30
  31 /**
  32  * Callbacks for NTLMSSP - for both client and server operating modes
  33  *
  34  */
  35
  36 static const struct ntlmssp_callbacks {
  37         enum ntlmssp_role role;
  38         enum ntlmssp_message_type command;
  39         NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
  40                             TALLOC_CTX *out_mem_ctx,
  41                             DATA_BLOB in, DATA_BLOB *out);
  42 } ntlmssp_callbacks[] = {
  43         {
  44                 .role           = NTLMSSP_CLIENT,
  45                 .command        = NTLMSSP_INITIAL,
  46                 .sync_fn        = ntlmssp_client_initial,
  47         },{
  48                 .role           = NTLMSSP_SERVER,
  49                 .command        = NTLMSSP_NEGOTIATE,
  50                 .sync_fn        = gensec_ntlmssp_server_negotiate,
  51         },{
  52                 .role           = NTLMSSP_CLIENT,
  53                 .command        = NTLMSSP_CHALLENGE,
  54                 .sync_fn        = ntlmssp_client_challenge,
  55         },{
  56                 .role           = NTLMSSP_SERVER,
  57                 .command        = NTLMSSP_AUTH,
  58                 .sync_fn        = gensec_ntlmssp_server_auth,
  59         }
  60 };
  61
  62
  63 static NTSTATUS gensec_ntlmssp_magic(struct gensec_security *gensec_security,
  64                                      const DATA_BLOB *first_packet)
  65 {
  66         if (first_packet->length > 8 && memcmp("NTLMSSP\0", first_packet->data, 8) == 0) {
  67                 return NT_STATUS_OK;
  68         } else {
  69                 return NT_STATUS_INVALID_PARAMETER;
  70         }
  71 }
  72
  73 static NTSTATUS gensec_ntlmssp_update_find(struct ntlmssp_state *ntlmssp_state,
  74                                            const DATA_BLOB input, uint32_t *idx)
  75 {
  76         struct gensec_ntlmssp_context *gensec_ntlmssp =
  77                 talloc_get_type_abort(ntlmssp_state->callback_private,
  78                                       struct gensec_ntlmssp_context);
  79         struct gensec_security *gensec_security = gensec_ntlmssp->gensec_security;
  80         uint32_t ntlmssp_command;
  81         uint32_t i;
  82
  83         if (ntlmssp_state->expected_state == NTLMSSP_DONE) {
  84                 /* We are strict here because other modules, which we
  85                  * don't fully control (such as GSSAPI) are also
  86                  * strict, but are tested less often */
  87
  88                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
  89                 return NT_STATUS_INVALID_PARAMETER;
  90         }
  91
  92         if (!input.length) {
  93                 switch (ntlmssp_state->role) {
  94                 case NTLMSSP_CLIENT:
  95                         ntlmssp_command = NTLMSSP_INITIAL;
  96                         break;
  97                 case NTLMSSP_SERVER:
  98                         if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
  99                                 /* 'datagram' mode - no neg packet */
 100                                 ntlmssp_command = NTLMSSP_NEGOTIATE;
 101                         } else {
 102                                 /* This is normal in SPNEGO mech negotiation fallback */
 103                                 DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
 104                                 return NT_STATUS_INVALID_PARAMETER;
 105                         }
 106                         break;
 107                 }
 108         } else {
 109                 if (!msrpc_parse(ntlmssp_state,
 110                                  &input, "Cd",
 111                                  "NTLMSSP",
 112                                  &ntlmssp_command)) {
 113                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 114                         dump_data(2, input.data, input.length);
 115                         return NT_STATUS_INVALID_PARAMETER;
 116                 }
 117         }
 118
 119         if (ntlmssp_command != ntlmssp_state->expected_state) {
 120                 DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command, ntlmssp_state->expected_state));
 121                 return NT_STATUS_INVALID_PARAMETER;
 122         }
 123
 124         for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
 125                 if (ntlmssp_callbacks[i].role == ntlmssp_state->role &&
 126                     ntlmssp_callbacks[i].command == ntlmssp_command) {
 127                         *idx = i;
 128                         return NT_STATUS_OK;
 129                 }
 130         }
 131
 132         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 133                   ntlmssp_state->role, ntlmssp_command));
 134
 135         return NT_STATUS_INVALID_PARAMETER;
 136 }
 137
 138 /**
 139  * Next state function for the wrapped NTLMSSP state machine
 140  *
 141  * @param gensec_security GENSEC state, initialised to NTLMSSP
 142  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 143  * @param in The request, as a DATA_BLOB
 144  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 145  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 146  *                or NT_STATUS_OK if the user is authenticated.
 147  */
 148
 149 static NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
 150                                       TALLOC_CTX *out_mem_ctx,
 151                                       const DATA_BLOB input, DATA_BLOB *out)
 152 {
 153         struct gensec_ntlmssp_context *gensec_ntlmssp =
 154                 talloc_get_type_abort(gensec_security->private_data,
 155                                       struct gensec_ntlmssp_context);
 156         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 157         NTSTATUS status;
 158         uint32_t i;
 159
 160         *out = data_blob(NULL, 0);
 161
 162         if (!out_mem_ctx) {
 163                 /* if the caller doesn't want to manage/own the memory,
 164                    we can put it on our context */
 165                 out_mem_ctx = ntlmssp_state;
 166         }
 167
 168         status = gensec_ntlmssp_update_find(ntlmssp_state, input, &i);
 169         NT_STATUS_NOT_OK_RETURN(status);
 170
 171         status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
 172         NT_STATUS_NOT_OK_RETURN(status);
 173
 174         return NT_STATUS_OK;
 175 }
 176
 177 /**
 178  * Return the NTLMSSP master session key
 179  *
 180  * @param ntlmssp_state NTLMSSP State
 181  */
 182
 183 NTSTATUS gensec_ntlmssp_session_key(struct gensec_security *gensec_security,
 184                                     DATA_BLOB *session_key)
 185 {
 186         struct gensec_ntlmssp_context *gensec_ntlmssp =
 187                 talloc_get_type_abort(gensec_security->private_data,
 188                                       struct gensec_ntlmssp_context);
 189         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 190
 191         if (ntlmssp_state->expected_state != NTLMSSP_DONE) {
 192                 return NT_STATUS_NO_USER_SESSION_KEY;
 193         }
 194
 195         if (!ntlmssp_state->session_key.data) {
 196                 return NT_STATUS_NO_USER_SESSION_KEY;
 197         }
 198         *session_key = ntlmssp_state->session_key;
 199
 200         return NT_STATUS_OK;
 201 }
 202
 203 static bool gensec_ntlmssp_have_feature(struct gensec_security *gensec_security,
 204                                         uint32_t feature)
 205 {
 206         struct gensec_ntlmssp_context *gensec_ntlmssp =
 207                 talloc_get_type_abort(gensec_security->private_data,
 208                                       struct gensec_ntlmssp_context);
 209         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 210
 211         if (feature & GENSEC_FEATURE_SIGN) {
 212                 if (!ntlmssp_state->session_key.length) {
 213                         return false;
 214                 }
 215                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SIGN) {
 216                         return true;
 217                 }
 218         }
 219         if (feature & GENSEC_FEATURE_SEAL) {
 220                 if (!ntlmssp_state->session_key.length) {
 221                         return false;
 222                 }
 223                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_SEAL) {
 224                         return true;
 225                 }
 226         }
 227         if (feature & GENSEC_FEATURE_SESSION_KEY) {
 228                 if (ntlmssp_state->session_key.length) {
 229                         return true;
 230                 }
 231         }
 232         if (feature & GENSEC_FEATURE_DCE_STYLE) {
 233                 return true;
 234         }
 235         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
 236                 if (ntlmssp_state->neg_flags & NTLMSSP_NEGOTIATE_NTLM2) {
 237                         return true;
 238                 }
 239         }
 240         return false;
 241 }
 242
 243 NTSTATUS gensec_ntlmssp_start(struct gensec_security *gensec_security)
 244 {
 245         struct gensec_ntlmssp_context *gensec_ntlmssp;
 246         struct ntlmssp_state *ntlmssp_state;
 247
 248         gensec_ntlmssp = talloc_zero(gensec_security,
 249                                      struct gensec_ntlmssp_context);
 250         if (!gensec_ntlmssp) {
 251                 return NT_STATUS_NO_MEMORY;
 252         }
 253
 254         gensec_ntlmssp->gensec_security = gensec_security;
 255
 256         ntlmssp_state = talloc_zero(gensec_ntlmssp,
 257                                     struct ntlmssp_state);
 258         if (!ntlmssp_state) {
 259                 return NT_STATUS_NO_MEMORY;
 260         }
 261
 262         ntlmssp_state->callback_private = gensec_ntlmssp;
 263
 264         gensec_ntlmssp->ntlmssp_state = ntlmssp_state;
 265
 266         gensec_security->private_data = gensec_ntlmssp;
 267         return NT_STATUS_OK;
 268 }
 269
 270 static const char *gensec_ntlmssp_oids[] = {
 271         GENSEC_OID_NTLMSSP,
 272         NULL
 273 };
 274
 275 static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
 276         .name           = "ntlmssp",
 277         .sasl_name      = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
 278         .auth_type      = DCERPC_AUTH_TYPE_NTLMSSP,
 279         .oid            = gensec_ntlmssp_oids,
 280         .client_start   = gensec_ntlmssp_client_start,
 281         .server_start   = gensec_ntlmssp_server_start,
 282         .magic          = gensec_ntlmssp_magic,
 283         .update         = gensec_ntlmssp_update,
 284         .sig_size       = gensec_ntlmssp_sig_size,
 285         .sign_packet    = gensec_ntlmssp_sign_packet,
 286         .check_packet   = gensec_ntlmssp_check_packet,
 287         .seal_packet    = gensec_ntlmssp_seal_packet,
 288         .unseal_packet  = gensec_ntlmssp_unseal_packet,
 289         .wrap           = gensec_ntlmssp_wrap,
 290         .unwrap         = gensec_ntlmssp_unwrap,
 291         .session_key    = gensec_ntlmssp_session_key,
 292         .session_info   = gensec_ntlmssp_session_info,
 293         .have_feature   = gensec_ntlmssp_have_feature,
 294         .enabled        = true,
 295         .priority       = GENSEC_NTLMSSP
 296 };
 297
 298
 299 _PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
 300 {
 301         NTSTATUS ret;
 302
 303         ret = gensec_register(&gensec_ntlmssp_security_ops);
 304         if (!NT_STATUS_IS_OK(ret)) {
 305                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 306                         gensec_ntlmssp_security_ops.name));
 307                 return ret;
 308         }
 309
 310         return ret;
 311 }