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