source4/auth/gensec/schannel.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    dcerpc schannel operations
   5
   6    Copyright (C) Andrew Tridgell 2004
   7    Copyright (C) Andrew Bartlett <abartlet@samba.org> 2004-2005
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 2 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program; if not, write to the Free Software
  21    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22 */
  23
  24 #include "includes.h"
  25 #include "librpc/gen_ndr/ndr_schannel.h"
  26 #include "auth/auth.h"
  27 #include "auth/gensec/schannel.h"
  28 #include "auth/gensec/schannel_state.h"
  29 #include "auth/gensec/schannel_proto.h"
  30 #include "librpc/rpc/dcerpc.h"
  31
  32 static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
  33 {
  34         return 32;
  35 }
  36
  37 static NTSTATUS schannel_session_key(struct gensec_security *gensec_security,
  38                                             DATA_BLOB *session_key)
  39 {
  40         return NT_STATUS_NOT_IMPLEMENTED;
  41 }
  42
  43 static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
  44                                        const DATA_BLOB in, DATA_BLOB *out)
  45 {
  46         struct schannel_state *state = gensec_security->private_data;
  47         NTSTATUS status;
  48         struct schannel_bind bind_schannel;
  49         struct schannel_bind_ack bind_schannel_ack;
  50         struct creds_CredentialState *creds;
  51
  52         const char *workstation;
  53         const char *domain;
  54         *out = data_blob(NULL, 0);
  55
  56         switch (gensec_security->gensec_role) {
  57         case GENSEC_CLIENT:
  58                 if (state->state != SCHANNEL_STATE_START) {
  59                         /* we could parse the bind ack, but we don't know what it is yet */
  60                         return NT_STATUS_OK;
  61                 }
  62
  63                 state->creds = talloc_reference(state, cli_credentials_get_netlogon_creds(gensec_security->credentials));
  64
  65                 bind_schannel.unknown1 = 0;
  66 #if 0
  67                 /* to support this we'd need to have access to the full domain name */
  68                 bind_schannel.bind_type = 23;
  69                 bind_schannel.u.info23.domain = cli_credentials_get_domain(gensec_security->credentials);
  70                 bind_schannel.u.info23.workstation = cli_credentials_get_workstation(gensec_security->credentials);
  71                 bind_schannel.u.info23.dnsdomain = cli_credentials_get_realm(gensec_security->credentials);
  72                 /* w2k3 refuses us if we use the full DNS workstation?
  73                  why? perhaps because we don't fill in the dNSHostName
  74                  attribute in the machine account? */
  75                 bind_schannel.u.info23.dnsworkstation = cli_credentials_get_workstation(gensec_security->credentials);
  76 #else
  77                 bind_schannel.bind_type = 3;
  78                 bind_schannel.u.info3.domain = cli_credentials_get_domain(gensec_security->credentials);
  79                 bind_schannel.u.info3.workstation = cli_credentials_get_workstation(gensec_security->credentials);
  80 #endif
  81
  82                 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
  83                                               (ndr_push_flags_fn_t)ndr_push_schannel_bind);
  84                 if (!NT_STATUS_IS_OK(status)) {
  85                         DEBUG(3, ("Could not create schannel bind: %s\n",
  86                                   nt_errstr(status)));
  87                         return status;
  88                 }
  89
  90                 state->state = SCHANNEL_STATE_UPDATE_1;
  91
  92                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
  93         case GENSEC_SERVER:
  94
  95                 if (state->state != SCHANNEL_STATE_START) {
  96                         /* no third leg on this protocol */
  97                         return NT_STATUS_INVALID_PARAMETER;
  98                 }
  99
 100                 /* parse the schannel startup blob */
 101                 status = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
 102                                               (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
 103                 if (!NT_STATUS_IS_OK(status)) {
 104                         return status;
 105                 }
 106
 107                 if (bind_schannel.bind_type == 23) {
 108                         workstation = bind_schannel.u.info23.workstation;
 109                         domain = bind_schannel.u.info23.domain;
 110                 } else {
 111                         workstation = bind_schannel.u.info3.workstation;
 112                         domain = bind_schannel.u.info3.domain;
 113                 }
 114
 115                 /* pull the session key for this client */
 116                 status = schannel_fetch_session_key(out_mem_ctx, workstation,
 117                                                     domain, &creds);
 118                 if (!NT_STATUS_IS_OK(status)) {
 119                         DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
 120                                   workstation, nt_errstr(status)));
 121                         return status;
 122                 }
 123
 124                 state->creds = talloc_reference(state, creds);
 125
 126                 bind_schannel_ack.unknown1 = 1;
 127                 bind_schannel_ack.unknown2 = 0;
 128                 bind_schannel_ack.unknown3 = 0x6c0000;
 129
 130                 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
 131                                               (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
 132                 if (!NT_STATUS_IS_OK(status)) {
 133                         DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
 134                                   workstation, nt_errstr(status)));
 135                         return status;
 136                 }
 137
 138                 state->state = SCHANNEL_STATE_UPDATE_1;
 139
 140                 return NT_STATUS_OK;
 141         }
 142         return NT_STATUS_INVALID_PARAMETER;
 143 }
 144
 145 /**
 146  * Return the struct creds_CredentialState.
 147  *
 148  * Make sure not to call this unless gensec is using schannel...
 149  */
 150
 151 /* TODO: make this non-public */
 152 _PUBLIC_ NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
 153                                TALLOC_CTX *mem_ctx,
 154                                struct creds_CredentialState **creds)
 155 {
 156         struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
 157
 158         *creds = talloc_reference(mem_ctx, state->creds);
 159         if (!*creds) {
 160                 return NT_STATUS_NO_MEMORY;
 161         }
 162         return NT_STATUS_OK;
 163 }
 164
 165
 166 /**
 167  * Returns anonymous credentials for schannel, matching Win2k3.
 168  *
 169  */
 170
 171 static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
 172                                          struct auth_session_info **_session_info)
 173 {
 174         struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
 175         return auth_anonymous_session_info(state, _session_info);
 176 }
 177
 178 static NTSTATUS schannel_start(struct gensec_security *gensec_security)
 179 {
 180         struct schannel_state *state;
 181
 182         state = talloc(gensec_security, struct schannel_state);
 183         if (!state) {
 184                 return NT_STATUS_NO_MEMORY;
 185         }
 186
 187         state->state = SCHANNEL_STATE_START;
 188         state->seq_num = 0;
 189         gensec_security->private_data = state;
 190
 191         return NT_STATUS_OK;
 192 }
 193
 194 static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
 195 {
 196         NTSTATUS status;
 197         struct schannel_state *state;
 198
 199         status = schannel_start(gensec_security);
 200         if (!NT_STATUS_IS_OK(status)) {
 201                 return status;
 202         }
 203
 204         state = gensec_security->private_data;
 205         state->initiator = False;
 206
 207         return NT_STATUS_OK;
 208 }
 209
 210 static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
 211 {
 212         NTSTATUS status;
 213         struct schannel_state *state;
 214
 215         status = schannel_start(gensec_security);
 216         if (!NT_STATUS_IS_OK(status)) {
 217                 return status;
 218         }
 219
 220         state = gensec_security->private_data;
 221         state->initiator = True;
 222
 223         return NT_STATUS_OK;
 224 }
 225
 226
 227 static BOOL schannel_have_feature(struct gensec_security *gensec_security,
 228                                          uint32_t feature)
 229 {
 230         if (feature & (GENSEC_FEATURE_SIGN |
 231                        GENSEC_FEATURE_SEAL)) {
 232                 return True;
 233         }
 234         if (feature & GENSEC_FEATURE_DCE_STYLE) {
 235                 return True;
 236         }
 237         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
 238                 return True;
 239         }
 240         return False;
 241 }
 242
 243
 244 static const struct gensec_security_ops gensec_schannel_security_ops = {
 245         .name           = "schannel",
 246         .auth_type      = DCERPC_AUTH_TYPE_SCHANNEL,
 247         .client_start   = schannel_client_start,
 248         .server_start   = schannel_server_start,
 249         .update         = schannel_update,
 250         .seal_packet    = schannel_seal_packet,
 251         .sign_packet    = schannel_sign_packet,
 252         .check_packet   = schannel_check_packet,
 253         .unseal_packet  = schannel_unseal_packet,
 254         .session_key    = schannel_session_key,
 255         .session_info   = schannel_session_info,
 256         .sig_size       = schannel_sig_size,
 257         .have_feature   = schannel_have_feature,
 258         .enabled        = True,
 259         .priority       = GENSEC_SCHANNEL
 260 };
 261
 262 NTSTATUS gensec_schannel_init(void)
 263 {
 264         NTSTATUS ret;
 265         ret = gensec_register(&gensec_schannel_security_ops);
 266         if (!NT_STATUS_IS_OK(ret)) {
 267                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 268                         gensec_schannel_security_ops.name));
 269                 return ret;
 270         }
 271
 272         return ret;
 273 }