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 struct auth_session_info;
  25
  26 #include "includes.h"
  27 #include "auth/ntlmssp/ntlmssp.h"
  28 #include "auth/ntlmssp/ntlmssp_private.h"
  29 #include "../libcli/auth/libcli_auth.h"
  30 #include "librpc/gen_ndr/ndr_dcerpc.h"
  31 #include "auth/gensec/gensec.h"
  32 #include "auth/gensec/gensec_internal.h"
  33
  34 /**
  35  * Callbacks for NTLMSSP - for both client and server operating modes
  36  *
  37  */
  38
  39 static const struct ntlmssp_callbacks {
  40         enum ntlmssp_role role;
  41         enum ntlmssp_message_type command;
  42         NTSTATUS (*sync_fn)(struct gensec_security *gensec_security,
  43                             TALLOC_CTX *out_mem_ctx,
  44                             DATA_BLOB in, DATA_BLOB *out);
  45 } ntlmssp_callbacks[] = {
  46         {
  47                 .role           = NTLMSSP_CLIENT,
  48                 .command        = NTLMSSP_INITIAL,
  49                 .sync_fn        = ntlmssp_client_initial,
  50         },{
  51                 .role           = NTLMSSP_SERVER,
  52                 .command        = NTLMSSP_NEGOTIATE,
  53                 .sync_fn        = gensec_ntlmssp_server_negotiate,
  54         },{
  55                 .role           = NTLMSSP_CLIENT,
  56                 .command        = NTLMSSP_CHALLENGE,
  57                 .sync_fn        = ntlmssp_client_challenge,
  58         },{
  59                 .role           = NTLMSSP_SERVER,
  60                 .command        = NTLMSSP_AUTH,
  61                 .sync_fn        = gensec_ntlmssp_server_auth,
  62         }
  63 };
  64
  65
  66 static NTSTATUS gensec_ntlmssp_update_find(struct gensec_security *gensec_security,
  67                                            struct gensec_ntlmssp_context *gensec_ntlmssp,
  68                                            const DATA_BLOB input, uint32_t *idx)
  69 {
  70         uint32_t ntlmssp_command;
  71         uint32_t i;
  72
  73         if (gensec_ntlmssp->ntlmssp_state->expected_state == NTLMSSP_DONE) {
  74                 /* We are strict here because other modules, which we
  75                  * don't fully control (such as GSSAPI) are also
  76                  * strict, but are tested less often */
  77
  78                 DEBUG(1, ("Called NTLMSSP after state machine was 'done'\n"));
  79                 return NT_STATUS_INVALID_PARAMETER;
  80         }
  81
  82         if (!input.length) {
  83                 switch (gensec_ntlmssp->ntlmssp_state->role) {
  84                 case NTLMSSP_CLIENT:
  85                         ntlmssp_command = NTLMSSP_INITIAL;
  86                         break;
  87                 case NTLMSSP_SERVER:
  88                         if (gensec_security->want_features & GENSEC_FEATURE_DATAGRAM_MODE) {
  89                                 /* 'datagram' mode - no neg packet */
  90                                 ntlmssp_command = NTLMSSP_NEGOTIATE;
  91                         } else {
  92                                 /* This is normal in SPNEGO mech negotiation fallback */
  93                                 DEBUG(2, ("Failed to parse NTLMSSP packet: zero length\n"));
  94                                 return NT_STATUS_INVALID_PARAMETER;
  95                         }
  96                         break;
  97                 }
  98         } else {
  99                 if (!msrpc_parse(gensec_ntlmssp->ntlmssp_state,
 100                                  &input, "Cd",
 101                                  "NTLMSSP",
 102                                  &ntlmssp_command)) {
 103                         DEBUG(1, ("Failed to parse NTLMSSP packet, could not extract NTLMSSP command\n"));
 104                         dump_data(2, input.data, input.length);
 105                         return NT_STATUS_INVALID_PARAMETER;
 106                 }
 107         }
 108
 109         if (ntlmssp_command != gensec_ntlmssp->ntlmssp_state->expected_state) {
 110                 DEBUG(2, ("got NTLMSSP command %u, expected %u\n", ntlmssp_command,
 111                           gensec_ntlmssp->ntlmssp_state->expected_state));
 112                 return NT_STATUS_INVALID_PARAMETER;
 113         }
 114
 115         for (i=0; i < ARRAY_SIZE(ntlmssp_callbacks); i++) {
 116                 if (ntlmssp_callbacks[i].role == gensec_ntlmssp->ntlmssp_state->role &&
 117                     ntlmssp_callbacks[i].command == ntlmssp_command) {
 118                         *idx = i;
 119                         return NT_STATUS_OK;
 120                 }
 121         }
 122
 123         DEBUG(1, ("failed to find NTLMSSP callback for NTLMSSP mode %u, command %u\n",
 124                   gensec_ntlmssp->ntlmssp_state->role, ntlmssp_command));
 125
 126         return NT_STATUS_INVALID_PARAMETER;
 127 }
 128
 129 /**
 130  * Next state function for the wrapped NTLMSSP state machine
 131  *
 132  * @param gensec_security GENSEC state, initialised to NTLMSSP
 133  * @param out_mem_ctx The TALLOC_CTX for *out to be allocated on
 134  * @param in The request, as a DATA_BLOB
 135  * @param out The reply, as an talloc()ed DATA_BLOB, on *out_mem_ctx
 136  * @return Error, MORE_PROCESSING_REQUIRED if a reply is sent,
 137  *                or NT_STATUS_OK if the user is authenticated.
 138  */
 139
 140 NTSTATUS gensec_ntlmssp_update(struct gensec_security *gensec_security,
 141                                TALLOC_CTX *out_mem_ctx,
 142                                struct tevent_context *ev,
 143                                const DATA_BLOB input, DATA_BLOB *out)
 144 {
 145         struct gensec_ntlmssp_context *gensec_ntlmssp =
 146                 talloc_get_type_abort(gensec_security->private_data,
 147                                       struct gensec_ntlmssp_context);
 148         struct ntlmssp_state *ntlmssp_state = gensec_ntlmssp->ntlmssp_state;
 149         NTSTATUS status;
 150         uint32_t i;
 151
 152         *out = data_blob(NULL, 0);
 153
 154         if (!out_mem_ctx) {
 155                 /* if the caller doesn't want to manage/own the memory,
 156                    we can put it on our context */
 157                 out_mem_ctx = ntlmssp_state;
 158         }
 159
 160         status = gensec_ntlmssp_update_find(gensec_security, gensec_ntlmssp, input, &i);
 161         NT_STATUS_NOT_OK_RETURN(status);
 162
 163         status = ntlmssp_callbacks[i].sync_fn(gensec_security, out_mem_ctx, input, out);
 164         NT_STATUS_NOT_OK_RETURN(status);
 165
 166         return NT_STATUS_OK;
 167 }
 168
 169 static const char *gensec_ntlmssp_oids[] = {
 170         GENSEC_OID_NTLMSSP,
 171         NULL
 172 };
 173
 174 static const struct gensec_security_ops gensec_ntlmssp_security_ops = {
 175         .name           = "ntlmssp",
 176         .sasl_name      = GENSEC_SASL_NAME_NTLMSSP, /* "NTLM" */
 177         .auth_type      = DCERPC_AUTH_TYPE_NTLMSSP,
 178         .oid            = gensec_ntlmssp_oids,
 179         .client_start   = gensec_ntlmssp_client_start,
 180         .server_start   = gensec_ntlmssp_server_start,
 181         .magic          = gensec_ntlmssp_magic,
 182         .update         = gensec_ntlmssp_update,
 183         .sig_size       = gensec_ntlmssp_sig_size,
 184         .sign_packet    = gensec_ntlmssp_sign_packet,
 185         .check_packet   = gensec_ntlmssp_check_packet,
 186         .seal_packet    = gensec_ntlmssp_seal_packet,
 187         .unseal_packet  = gensec_ntlmssp_unseal_packet,
 188         .wrap           = gensec_ntlmssp_wrap,
 189         .unwrap         = gensec_ntlmssp_unwrap,
 190         .session_key    = gensec_ntlmssp_session_key,
 191         .session_info   = gensec_ntlmssp_session_info,
 192         .have_feature   = gensec_ntlmssp_have_feature,
 193         .enabled        = true,
 194         .priority       = GENSEC_NTLMSSP
 195 };
 196
 197
 198 _PUBLIC_ NTSTATUS gensec_ntlmssp_init(void)
 199 {
 200         NTSTATUS ret;
 201
 202         ret = gensec_register(&gensec_ntlmssp_security_ops);
 203         if (!NT_STATUS_IS_OK(ret)) {
 204                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 205                         gensec_ntlmssp_security_ops.name));
 206                 return ret;
 207         }
 208
 209         return ret;
 210 }
 211
 212 uint32_t gensec_ntlmssp_neg_flags(struct gensec_security *gensec_security)
 213 {
 214         struct gensec_ntlmssp_context *gensec_ntlmssp;
 215         if (gensec_security->ops != &gensec_ntlmssp_security_ops) {
 216                 return 0;
 217         }
 218         gensec_ntlmssp = talloc_get_type_abort(gensec_security->private_data,
 219                                                struct gensec_ntlmssp_context);
 220         return gensec_ntlmssp->ntlmssp_state->neg_flags;
 221 }