1/* 2 Unix SMB2 implementation. 3 4 Copyright (C) Andrew Bartlett 2001-2005 5 Copyright (C) Stefan Metzmacher 2005 6 7 This program is free software; you can redistribute it and/or modify 8 it under the terms of the GNU General Public License as published by 9 the Free Software Foundation; either version 3 of the License, or 10 (at your option) any later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program. If not, see <http://www.gnu.org/licenses/>. 19*/ 20 21#include "includes.h" 22#include "auth/credentials/credentials.h" 23#include "auth/auth.h" 24#include "auth/gensec/gensec.h" 25#include "libcli/raw/libcliraw.h" 26#include "libcli/raw/raw_proto.h" 27#include "libcli/smb2/smb2.h" 28#include "libcli/smb2/smb2_calls.h" 29#include "smb_server/smb_server.h" 30#include "smb_server/smb2/smb2_server.h" 31#include "smbd/service_stream.h" 32#include "param/param.h" 33 34static NTSTATUS smb2srv_negprot_secblob(struct smb2srv_request *req, DATA_BLOB *_blob) 35{ 36 struct gensec_security *gensec_security; 37 DATA_BLOB null_data_blob = data_blob(NULL, 0); 38 DATA_BLOB blob; 39 NTSTATUS nt_status; 40 struct cli_credentials *server_credentials; 41 42 server_credentials = cli_credentials_init(req); 43 if (!server_credentials) { 44 smbsrv_terminate_connection(req->smb_conn, "Failed to init server credentials\n"); 45 return NT_STATUS_NO_MEMORY; 46 } 47 48 cli_credentials_set_conf(server_credentials, req->smb_conn->lp_ctx); 49 nt_status = cli_credentials_set_machine_account(server_credentials, req->smb_conn->lp_ctx); 50 if (!NT_STATUS_IS_OK(nt_status)) { 51 DEBUG(10, ("Failed to obtain server credentials, perhaps a standalone server?: %s\n", nt_errstr(nt_status))); 52 talloc_free(server_credentials); 53 server_credentials = NULL; 54 } 55 56 req->smb_conn->negotiate.server_credentials = talloc_steal(req->smb_conn, server_credentials); 57 58 nt_status = samba_server_gensec_start(req, 59 req->smb_conn->connection->event.ctx, 60 req->smb_conn->connection->msg_ctx, 61 req->smb_conn->lp_ctx, 62 server_credentials, 63 "cifs", 64 &gensec_security); 65 if (!NT_STATUS_IS_OK(nt_status)) { 66 DEBUG(0, ("Failed to start GENSEC: %s\n", nt_errstr(nt_status))); 67 smbsrv_terminate_connection(req->smb_conn, "Failed to start GENSEC\n"); 68 return nt_status; 69 } 70 71 gensec_set_target_service(gensec_security, "cifs"); 72 73 gensec_set_credentials(gensec_security, server_credentials); 74 75 nt_status = gensec_start_mech_by_oid(gensec_security, GENSEC_OID_SPNEGO); 76 if (!NT_STATUS_IS_OK(nt_status)) { 77 DEBUG(0, ("Failed to start SPNEGO: %s\n", nt_errstr(nt_status))); 78 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO\n"); 79 return nt_status; 80 } 81 82 nt_status = gensec_update(gensec_security, req, null_data_blob, &blob); 83 if (!NT_STATUS_IS_OK(nt_status) && !NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) { 84 DEBUG(0, ("Failed to get SPNEGO to give us the first token: %s\n", nt_errstr(nt_status))); 85 smbsrv_terminate_connection(req->smb_conn, "Failed to start SPNEGO - no first token\n"); 86 return nt_status; 87 } 88 89 *_blob = blob; 90 return NT_STATUS_OK; 91} 92 93static NTSTATUS smb2srv_negprot_backend(struct smb2srv_request *req, struct smb2_negprot *io) 94{ 95 NTSTATUS status; 96 struct timeval current_time; 97 struct timeval boot_time; 98 uint16_t i; 99 uint16_t dialect = 0; 100 101 /* we only do one dialect for now */ 102 if (io->in.dialect_count < 1) { 103 return NT_STATUS_NOT_SUPPORTED; 104 } 105 for (i=0; i < io->in.dialect_count; i++) { 106 dialect = io->in.dialects[i]; 107 if (dialect == SMB2_DIALECT_REVISION_202) { 108 break; 109 } 110 } 111 if (dialect != SMB2_DIALECT_REVISION_202) { 112 DEBUG(0,("Got unexpected SMB2 dialect %u\n", dialect)); 113 return NT_STATUS_NOT_SUPPORTED; 114 } 115 116 req->smb_conn->negotiate.protocol = PROTOCOL_SMB2; 117 118 current_time = timeval_current(); /* TODO: handle timezone?! */ 119 boot_time = timeval_current(); /* TODO: fix me */ 120 121 ZERO_STRUCT(io->out); 122 switch (lp_server_signing(req->smb_conn->lp_ctx)) { 123 case SMB_SIGNING_OFF: 124 io->out.security_mode = 0; 125 break; 126 case SMB_SIGNING_SUPPORTED: 127 case SMB_SIGNING_AUTO: 128 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED; 129 break; 130 case SMB_SIGNING_REQUIRED: 131 io->out.security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED | SMB2_NEGOTIATE_SIGNING_REQUIRED; 132 /* force signing on immediately */ 133 req->smb_conn->smb2_signing_required = true; 134 break; 135 } 136 io->out.dialect_revision = dialect; 137 io->out.capabilities = 0; 138 io->out.max_transact_size = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 139 "smb2", "max transaction size", 0x10000); 140 io->out.max_read_size = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 141 "smb2", "max read size", 0x10000); 142 io->out.max_write_size = lp_parm_ulong(req->smb_conn->lp_ctx, NULL, 143 "smb2", "max write size", 0x10000); 144 io->out.system_time = timeval_to_nttime(¤t_time); 145 io->out.server_start_time = timeval_to_nttime(&boot_time); 146 io->out.reserved2 = 0; 147 status = smb2srv_negprot_secblob(req, &io->out.secblob); 148 NT_STATUS_NOT_OK_RETURN(status); 149 150 return NT_STATUS_OK; 151} 152 153static void smb2srv_negprot_send(struct smb2srv_request *req, struct smb2_negprot *io) 154{ 155 NTSTATUS status; 156 enum ndr_err_code ndr_err; 157 158 if (NT_STATUS_IS_ERR(req->status)) { 159 smb2srv_send_error(req, req->status); /* TODO: is this correct? */ 160 return; 161 } 162 163 status = smb2srv_setup_reply(req, 0x40, true, io->out.secblob.length); 164 if (!NT_STATUS_IS_OK(status)) { 165 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status)); 166 talloc_free(req); 167 return; 168 } 169 170 SSVAL(req->out.body, 0x02, io->out.security_mode); 171 SIVAL(req->out.body, 0x04, io->out.dialect_revision); 172 SIVAL(req->out.body, 0x06, io->out.reserved); 173 ndr_err = smbcli_push_guid(req->out.body, 0x08, &io->out.server_guid); 174 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { 175 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status)); 176 talloc_free(req); 177 return; 178 } 179 SIVAL(req->out.body, 0x18, io->out.capabilities); 180 SIVAL(req->out.body, 0x1C, io->out.max_transact_size); 181 SIVAL(req->out.body, 0x20, io->out.max_read_size); 182 SIVAL(req->out.body, 0x24, io->out.max_write_size); 183 push_nttime(req->out.body, 0x28, io->out.system_time); 184 push_nttime(req->out.body, 0x30, io->out.server_start_time); 185 SIVAL(req->out.body, 0x3C, io->out.reserved2); 186 status = smb2_push_o16s16_blob(&req->out, 0x38, io->out.secblob); 187 if (!NT_STATUS_IS_OK(status)) { 188 smbsrv_terminate_connection(req->smb_conn, nt_errstr(status)); 189 talloc_free(req); 190 return; 191 } 192 193 smb2srv_send_reply(req); 194} 195 196void smb2srv_negprot_recv(struct smb2srv_request *req) 197{ 198 struct smb2_negprot *io; 199 int i; 200 enum ndr_err_code ndr_err; 201 202 if (req->in.body_size < 0x26) { 203 smbsrv_terminate_connection(req->smb_conn, "Bad body size in SMB2 negprot"); 204 return; 205 } 206 207 io = talloc(req, struct smb2_negprot); 208 if (!io) { 209 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY)); 210 talloc_free(req); 211 return; 212 } 213 214 io->in.dialect_count = SVAL(req->in.body, 0x02); 215 io->in.security_mode = SVAL(req->in.body, 0x04); 216 io->in.reserved = SVAL(req->in.body, 0x06); 217 io->in.capabilities = IVAL(req->in.body, 0x08); 218 ndr_err = smbcli_pull_guid(req->in.body, 0xC, &io->in.client_guid); 219 if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) { 220 smbsrv_terminate_connection(req->smb_conn, "Bad GUID in SMB2 negprot"); 221 talloc_free(req); 222 return; 223 } 224 io->in.start_time = smbcli_pull_nttime(req->in.body, 0x1C); 225 226 io->in.dialects = talloc_array(req, uint16_t, io->in.dialect_count); 227 if (io->in.dialects == NULL) { 228 smbsrv_terminate_connection(req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY)); 229 talloc_free(req); 230 return; 231 } 232 for (i=0;i<io->in.dialect_count;i++) { 233 io->in.dialects[i] = SVAL(req->in.body, 0x24+i*2); 234 } 235 236 req->status = smb2srv_negprot_backend(req, io); 237 238 if (req->control_flags & SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY) { 239 talloc_free(req); 240 return; 241 } 242 smb2srv_negprot_send(req, io); 243} 244 245/* 246 * reply to a SMB negprot request with dialect "SMB 2.002" 247 */ 248void smb2srv_reply_smb_negprot(struct smbsrv_request *smb_req) 249{ 250 struct smb2srv_request *req; 251 uint32_t body_fixed_size = 0x26; 252 253 req = talloc_zero(smb_req->smb_conn, struct smb2srv_request); 254 if (!req) goto nomem; 255 req->smb_conn = smb_req->smb_conn; 256 req->request_time = smb_req->request_time; 257 talloc_steal(req, smb_req); 258 259 req->in.size = NBT_HDR_SIZE+SMB2_HDR_BODY+body_fixed_size; 260 req->in.allocated = req->in.size; 261 req->in.buffer = talloc_array(req, uint8_t, req->in.allocated); 262 if (!req->in.buffer) goto nomem; 263 req->in.hdr = req->in.buffer + NBT_HDR_SIZE; 264 req->in.body = req->in.hdr + SMB2_HDR_BODY; 265 req->in.body_size = body_fixed_size; 266 req->in.dynamic = NULL; 267 268 smb2srv_setup_bufinfo(req); 269 270 SIVAL(req->in.hdr, 0, SMB2_MAGIC); 271 SSVAL(req->in.hdr, SMB2_HDR_LENGTH, SMB2_HDR_BODY); 272 SSVAL(req->in.hdr, SMB2_HDR_EPOCH, 0); 273 SIVAL(req->in.hdr, SMB2_HDR_STATUS, 0); 274 SSVAL(req->in.hdr, SMB2_HDR_OPCODE, SMB2_OP_NEGPROT); 275 SSVAL(req->in.hdr, SMB2_HDR_CREDIT, 0); 276 SIVAL(req->in.hdr, SMB2_HDR_FLAGS, 0); 277 SIVAL(req->in.hdr, SMB2_HDR_NEXT_COMMAND, 0); 278 SBVAL(req->in.hdr, SMB2_HDR_MESSAGE_ID, 0); 279 SIVAL(req->in.hdr, SMB2_HDR_PID, 0); 280 SIVAL(req->in.hdr, SMB2_HDR_TID, 0); 281 SBVAL(req->in.hdr, SMB2_HDR_SESSION_ID, 0); 282 memset(req->in.hdr+SMB2_HDR_SIGNATURE, 0, 16); 283 284 /* this seems to be a bug, they use 0x24 but the length is 0x26 */ 285 SSVAL(req->in.body, 0x00, 0x24); 286 287 SSVAL(req->in.body, 0x02, 1); 288 memset(req->in.body+0x04, 0, 32); 289 SSVAL(req->in.body, 0x24, SMB2_DIALECT_REVISION_202); 290 291 smb2srv_negprot_recv(req); 292 return; 293nomem: 294 smbsrv_terminate_connection(smb_req->smb_conn, nt_errstr(NT_STATUS_NO_MEMORY)); 295 talloc_free(req); 296 return; 297} 298