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 3 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, see <http://www.gnu.org/licenses/>.
  21 */
  22
  23 #include "includes.h"
  24 #include "librpc/gen_ndr/ndr_schannel.h"
  25 #include "auth/auth.h"
  26 #include "auth/credentials/credentials.h"
  27 #include "auth/gensec/gensec.h"
  28 #include "auth/gensec/schannel.h"
  29 #include "auth/gensec/schannel_state.h"
  30 #include "auth/gensec/schannel_proto.h"
  31 #include "librpc/rpc/dcerpc.h"
  32
  33 static size_t schannel_sig_size(struct gensec_security *gensec_security, size_t data_size)
  34 {
  35         return 32;
  36 }
  37
  38 static NTSTATUS schannel_session_key(struct gensec_security *gensec_security,
  39                                             DATA_BLOB *session_key)
  40 {
  41         return NT_STATUS_NOT_IMPLEMENTED;
  42 }
  43
  44 static NTSTATUS schannel_update(struct gensec_security *gensec_security, TALLOC_CTX *out_mem_ctx,
  45                                        const DATA_BLOB in, DATA_BLOB *out)
  46 {
  47         struct schannel_state *state = (struct schannel_state *)gensec_security->private_data;
  48         NTSTATUS status;
  49         struct schannel_bind bind_schannel;
  50         struct schannel_bind_ack bind_schannel_ack;
  51         struct creds_CredentialState *creds;
  52
  53         const char *workstation;
  54         const char *domain;
  55         *out = data_blob(NULL, 0);
  56
  57         switch (gensec_security->gensec_role) {
  58         case GENSEC_CLIENT:
  59                 if (state->state != SCHANNEL_STATE_START) {
  60                         /* we could parse the bind ack, but we don't know what it is yet */
  61                         return NT_STATUS_OK;
  62                 }
  63
  64                 state->creds = talloc_reference(state, cli_credentials_get_netlogon_creds(gensec_security->credentials));
  65
  66                 bind_schannel.unknown1 = 0;
  67 #if 0
  68                 /* to support this we'd need to have access to the full domain name */
  69                 bind_schannel.bind_type = 23;
  70                 bind_schannel.u.info23.domain = cli_credentials_get_domain(gensec_security->credentials);
  71                 bind_schannel.u.info23.workstation = cli_credentials_get_workstation(gensec_security->credentials);
  72                 bind_schannel.u.info23.dnsdomain = cli_credentials_get_realm(gensec_security->credentials);
  73                 /* w2k3 refuses us if we use the full DNS workstation?
  74                  why? perhaps because we don't fill in the dNSHostName
  75                  attribute in the machine account? */
  76                 bind_schannel.u.info23.dnsworkstation = cli_credentials_get_workstation(gensec_security->credentials);
  77 #else
  78                 bind_schannel.bind_type = 3;
  79                 bind_schannel.u.info3.domain = cli_credentials_get_domain(gensec_security->credentials);
  80                 bind_schannel.u.info3.workstation = cli_credentials_get_workstation(gensec_security->credentials);
  81 #endif
  82
  83                 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
  84                                               (ndr_push_flags_fn_t)ndr_push_schannel_bind);
  85                 if (!NT_STATUS_IS_OK(status)) {
  86                         DEBUG(3, ("Could not create schannel bind: %s\n",
  87                                   nt_errstr(status)));
  88                         return status;
  89                 }
  90
  91                 state->state = SCHANNEL_STATE_UPDATE_1;
  92
  93                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
  94         case GENSEC_SERVER:
  95
  96                 if (state->state != SCHANNEL_STATE_START) {
  97                         /* no third leg on this protocol */
  98                         return NT_STATUS_INVALID_PARAMETER;
  99                 }
 100
 101                 /* parse the schannel startup blob */
 102                 status = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
 103                                               (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
 104                 if (!NT_STATUS_IS_OK(status)) {
 105                         DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
 106                                   nt_errstr(status)));
 107                         return status;
 108                 }
 109
 110                 if (bind_schannel.bind_type == 23) {
 111                         workstation = bind_schannel.u.info23.workstation;
 112                         domain = bind_schannel.u.info23.domain;
 113                 } else {
 114                         workstation = bind_schannel.u.info3.workstation;
 115                         domain = bind_schannel.u.info3.domain;
 116                 }
 117
 118                 /* pull the session key for this client */
 119                 status = schannel_fetch_session_key(out_mem_ctx, workstation,
 120                                                     domain, &creds);
 121                 if (!NT_STATUS_IS_OK(status)) {
 122                         DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
 123                                   workstation, nt_errstr(status)));
 124                         if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
 125                                 return NT_STATUS_LOGON_FAILURE;
 126                         }
 127                         return status;
 128                 }
 129
 130                 state->creds = talloc_reference(state, creds);
 131
 132                 bind_schannel_ack.unknown1 = 1;
 133                 bind_schannel_ack.unknown2 = 0;
 134                 bind_schannel_ack.unknown3 = 0x6c0000;
 135
 136                 status = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
 137                                               (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
 138                 if (!NT_STATUS_IS_OK(status)) {
 139                         DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
 140                                   workstation, nt_errstr(status)));
 141                         return status;
 142                 }
 143
 144                 state->state = SCHANNEL_STATE_UPDATE_1;
 145
 146                 return NT_STATUS_OK;
 147         }
 148         return NT_STATUS_INVALID_PARAMETER;
 149 }
 150
 151 /**
 152  * Return the struct creds_CredentialState.
 153  *
 154  * Make sure not to call this unless gensec is using schannel...
 155  */
 156
 157 /* TODO: make this non-public */
 158 _PUBLIC_ NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
 159                                TALLOC_CTX *mem_ctx,
 160                                struct creds_CredentialState **creds)
 161 {
 162         struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
 163
 164         *creds = talloc_reference(mem_ctx, state->creds);
 165         if (!*creds) {
 166                 return NT_STATUS_NO_MEMORY;
 167         }
 168         return NT_STATUS_OK;
 169 }
 170
 171
 172 /**
 173  * Returns anonymous credentials for schannel, matching Win2k3.
 174  *
 175  */
 176
 177 static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
 178                                          struct auth_session_info **_session_info)
 179 {
 180         struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
 181         return auth_anonymous_session_info(state, _session_info);
 182 }
 183
 184 static NTSTATUS schannel_start(struct gensec_security *gensec_security)
 185 {
 186         struct schannel_state *state;
 187
 188         state = talloc(gensec_security, struct schannel_state);
 189         if (!state) {
 190                 return NT_STATUS_NO_MEMORY;
 191         }
 192
 193         state->state = SCHANNEL_STATE_START;
 194         state->seq_num = 0;
 195         gensec_security->private_data = state;
 196
 197         return NT_STATUS_OK;
 198 }
 199
 200 static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
 201 {
 202         NTSTATUS status;
 203         struct schannel_state *state;
 204
 205         status = schannel_start(gensec_security);
 206         if (!NT_STATUS_IS_OK(status)) {
 207                 return status;
 208         }
 209
 210         state = (struct schannel_state *)gensec_security->private_data;
 211         state->initiator = False;
 212
 213         return NT_STATUS_OK;
 214 }
 215
 216 static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
 217 {
 218         NTSTATUS status;
 219         struct schannel_state *state;
 220
 221         status = schannel_start(gensec_security);
 222         if (!NT_STATUS_IS_OK(status)) {
 223                 return status;
 224         }
 225
 226         state = (struct schannel_state *)gensec_security->private_data;
 227         state->initiator = True;
 228
 229         return NT_STATUS_OK;
 230 }
 231
 232
 233 static BOOL schannel_have_feature(struct gensec_security *gensec_security,
 234                                          uint32_t feature)
 235 {
 236         if (feature & (GENSEC_FEATURE_SIGN |
 237                        GENSEC_FEATURE_SEAL)) {
 238                 return True;
 239         }
 240         if (feature & GENSEC_FEATURE_DCE_STYLE) {
 241                 return True;
 242         }
 243         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
 244                 return True;
 245         }
 246         return False;
 247 }
 248
 249
 250 static const struct gensec_security_ops gensec_schannel_security_ops = {
 251         .name           = "schannel",
 252         .auth_type      = DCERPC_AUTH_TYPE_SCHANNEL,
 253         .client_start   = schannel_client_start,
 254         .server_start   = schannel_server_start,
 255         .update         = schannel_update,
 256         .seal_packet    = schannel_seal_packet,
 257         .sign_packet    = schannel_sign_packet,
 258         .check_packet   = schannel_check_packet,
 259         .unseal_packet  = schannel_unseal_packet,
 260         .session_key    = schannel_session_key,
 261         .session_info   = schannel_session_info,
 262         .sig_size       = schannel_sig_size,
 263         .have_feature   = schannel_have_feature,
 264         .enabled        = True,
 265         .priority       = GENSEC_SCHANNEL
 266 };
 267
 268 NTSTATUS gensec_schannel_init(void)
 269 {
 270         NTSTATUS ret;
 271         ret = gensec_register(&gensec_schannel_security_ops);
 272         if (!NT_STATUS_IS_OK(ret)) {
 273                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 274                         gensec_schannel_security_ops.name));
 275                 return ret;
 276         }
 277
 278         return ret;
 279 }