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         enum ndr_err_code ndr_err;
  50         struct schannel_bind bind_schannel;
  51         struct schannel_bind_ack bind_schannel_ack;
  52         struct creds_CredentialState *creds;
  53
  54         const char *workstation;
  55         const char *domain;
  56         *out = data_blob(NULL, 0);
  57
  58         switch (gensec_security->gensec_role) {
  59         case GENSEC_CLIENT:
  60                 if (state->state != SCHANNEL_STATE_START) {
  61                         /* we could parse the bind ack, but we don't know what it is yet */
  62                         return NT_STATUS_OK;
  63                 }
  64
  65                 state->creds = talloc_reference(state, cli_credentials_get_netlogon_creds(gensec_security->credentials));
  66
  67                 bind_schannel.unknown1 = 0;
  68 #if 0
  69                 /* to support this we'd need to have access to the full domain name */
  70                 bind_schannel.bind_type = 23;
  71                 bind_schannel.u.info23.domain = cli_credentials_get_domain(gensec_security->credentials);
  72                 bind_schannel.u.info23.workstation = cli_credentials_get_workstation(gensec_security->credentials);
  73                 bind_schannel.u.info23.dnsdomain = cli_credentials_get_realm(gensec_security->credentials);
  74                 /* w2k3 refuses us if we use the full DNS workstation?
  75                  why? perhaps because we don't fill in the dNSHostName
  76                  attribute in the machine account? */
  77                 bind_schannel.u.info23.dnsworkstation = cli_credentials_get_workstation(gensec_security->credentials);
  78 #else
  79                 bind_schannel.bind_type = 3;
  80                 bind_schannel.u.info3.domain = cli_credentials_get_domain(gensec_security->credentials);
  81                 bind_schannel.u.info3.workstation = cli_credentials_get_workstation(gensec_security->credentials);
  82 #endif
  83
  84                 ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel,
  85                                                (ndr_push_flags_fn_t)ndr_push_schannel_bind);
  86                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
  87                         status = ndr_map_error2ntstatus(ndr_err);
  88                         DEBUG(3, ("Could not create schannel bind: %s\n",
  89                                   nt_errstr(status)));
  90                         return status;
  91                 }
  92
  93                 state->state = SCHANNEL_STATE_UPDATE_1;
  94
  95                 return NT_STATUS_MORE_PROCESSING_REQUIRED;
  96         case GENSEC_SERVER:
  97
  98                 if (state->state != SCHANNEL_STATE_START) {
  99                         /* no third leg on this protocol */
 100                         return NT_STATUS_INVALID_PARAMETER;
 101                 }
 102
 103                 /* parse the schannel startup blob */
 104                 ndr_err = ndr_pull_struct_blob(&in, out_mem_ctx, &bind_schannel,
 105                                                (ndr_pull_flags_fn_t)ndr_pull_schannel_bind);
 106                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 107                         status = ndr_map_error2ntstatus(ndr_err);
 108                         DEBUG(3, ("Could not parse incoming schannel bind: %s\n",
 109                                   nt_errstr(status)));
 110                         return status;
 111                 }
 112
 113                 if (bind_schannel.bind_type == 23) {
 114                         workstation = bind_schannel.u.info23.workstation;
 115                         domain = bind_schannel.u.info23.domain;
 116                 } else {
 117                         workstation = bind_schannel.u.info3.workstation;
 118                         domain = bind_schannel.u.info3.domain;
 119                 }
 120
 121                 /* pull the session key for this client */
 122                 status = schannel_fetch_session_key(out_mem_ctx, workstation,
 123                                                     domain, &creds);
 124                 if (!NT_STATUS_IS_OK(status)) {
 125                         DEBUG(3, ("Could not find session key for attempted schannel connection from %s: %s\n",
 126                                   workstation, nt_errstr(status)));
 127                         if (NT_STATUS_EQUAL(status, NT_STATUS_INVALID_HANDLE)) {
 128                                 return NT_STATUS_LOGON_FAILURE;
 129                         }
 130                         return status;
 131                 }
 132
 133                 state->creds = talloc_reference(state, creds);
 134
 135                 bind_schannel_ack.unknown1 = 1;
 136                 bind_schannel_ack.unknown2 = 0;
 137                 bind_schannel_ack.unknown3 = 0x6c0000;
 138
 139                 ndr_err = ndr_push_struct_blob(out, out_mem_ctx, &bind_schannel_ack,
 140                                                (ndr_push_flags_fn_t)ndr_push_schannel_bind_ack);
 141                 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 142                         status = ndr_map_error2ntstatus(ndr_err);
 143                         DEBUG(3, ("Could not return schannel bind ack for client %s: %s\n",
 144                                   workstation, nt_errstr(status)));
 145                         return status;
 146                 }
 147
 148                 state->state = SCHANNEL_STATE_UPDATE_1;
 149
 150                 return NT_STATUS_OK;
 151         }
 152         return NT_STATUS_INVALID_PARAMETER;
 153 }
 154
 155 /**
 156  * Return the struct creds_CredentialState.
 157  *
 158  * Make sure not to call this unless gensec is using schannel...
 159  */
 160
 161 /* TODO: make this non-public */
 162 _PUBLIC_ NTSTATUS dcerpc_schannel_creds(struct gensec_security *gensec_security,
 163                                TALLOC_CTX *mem_ctx,
 164                                struct creds_CredentialState **creds)
 165 {
 166         struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
 167
 168         *creds = talloc_reference(mem_ctx, state->creds);
 169         if (!*creds) {
 170                 return NT_STATUS_NO_MEMORY;
 171         }
 172         return NT_STATUS_OK;
 173 }
 174
 175
 176 /**
 177  * Returns anonymous credentials for schannel, matching Win2k3.
 178  *
 179  */
 180
 181 static NTSTATUS schannel_session_info(struct gensec_security *gensec_security,
 182                                          struct auth_session_info **_session_info)
 183 {
 184         struct schannel_state *state = talloc_get_type(gensec_security->private_data, struct schannel_state);
 185         return auth_anonymous_session_info(state, _session_info);
 186 }
 187
 188 static NTSTATUS schannel_start(struct gensec_security *gensec_security)
 189 {
 190         struct schannel_state *state;
 191
 192         state = talloc(gensec_security, struct schannel_state);
 193         if (!state) {
 194                 return NT_STATUS_NO_MEMORY;
 195         }
 196
 197         state->state = SCHANNEL_STATE_START;
 198         state->seq_num = 0;
 199         gensec_security->private_data = state;
 200
 201         return NT_STATUS_OK;
 202 }
 203
 204 static NTSTATUS schannel_server_start(struct gensec_security *gensec_security)
 205 {
 206         NTSTATUS status;
 207         struct schannel_state *state;
 208
 209         status = schannel_start(gensec_security);
 210         if (!NT_STATUS_IS_OK(status)) {
 211                 return status;
 212         }
 213
 214         state = (struct schannel_state *)gensec_security->private_data;
 215         state->initiator = false;
 216
 217         return NT_STATUS_OK;
 218 }
 219
 220 static NTSTATUS schannel_client_start(struct gensec_security *gensec_security)
 221 {
 222         NTSTATUS status;
 223         struct schannel_state *state;
 224
 225         status = schannel_start(gensec_security);
 226         if (!NT_STATUS_IS_OK(status)) {
 227                 return status;
 228         }
 229
 230         state = (struct schannel_state *)gensec_security->private_data;
 231         state->initiator = true;
 232
 233         return NT_STATUS_OK;
 234 }
 235
 236
 237 static bool schannel_have_feature(struct gensec_security *gensec_security,
 238                                          uint32_t feature)
 239 {
 240         if (feature & (GENSEC_FEATURE_SIGN |
 241                        GENSEC_FEATURE_SEAL)) {
 242                 return true;
 243         }
 244         if (feature & GENSEC_FEATURE_DCE_STYLE) {
 245                 return true;
 246         }
 247         if (feature & GENSEC_FEATURE_ASYNC_REPLIES) {
 248                 return true;
 249         }
 250         return false;
 251 }
 252
 253
 254 static const struct gensec_security_ops gensec_schannel_security_ops = {
 255         .name           = "schannel",
 256         .auth_type      = DCERPC_AUTH_TYPE_SCHANNEL,
 257         .client_start   = schannel_client_start,
 258         .server_start   = schannel_server_start,
 259         .update         = schannel_update,
 260         .seal_packet    = schannel_seal_packet,
 261         .sign_packet    = schannel_sign_packet,
 262         .check_packet   = schannel_check_packet,
 263         .unseal_packet  = schannel_unseal_packet,
 264         .session_key    = schannel_session_key,
 265         .session_info   = schannel_session_info,
 266         .sig_size       = schannel_sig_size,
 267         .have_feature   = schannel_have_feature,
 268         .enabled        = true,
 269         .priority       = GENSEC_SCHANNEL
 270 };
 271
 272 NTSTATUS gensec_schannel_init(void)
 273 {
 274         NTSTATUS ret;
 275         ret = gensec_register(&gensec_schannel_security_ops);
 276         if (!NT_STATUS_IS_OK(ret)) {
 277                 DEBUG(0,("Failed to register '%s' gensec backend!\n",
 278                         gensec_schannel_security_ops.name));
 279                 return ret;
 280         }
 281
 282         return ret;
 283 }