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