enum protocol_types smbd_smb2_protocol_dialect_match(const uint8_t *indyn, const int dialect_count, uint16_t *dialect) { struct { enum protocol_types proto; uint16_t dialect; } pd[] = { { PROTOCOL_SMB3_00, SMB3_DIALECT_REVISION_300 }, { PROTOCOL_SMB2_24, SMB2_DIALECT_REVISION_224 }, { PROTOCOL_SMB2_22, SMB2_DIALECT_REVISION_222 }, { PROTOCOL_SMB2_10, SMB2_DIALECT_REVISION_210 }, { PROTOCOL_SMB2_02, SMB2_DIALECT_REVISION_202 }, }; size_t i; for (i = 0; i < ARRAY_SIZE(pd); i ++) { size_t c = 0; if (lp_srv_maxprotocol() < pd[i].proto) { continue; } if (lp_srv_minprotocol() > pd[i].proto) { continue; } for (c = 0; c < dialect_count; c++) { *dialect = SVAL(indyn, c*2); if (*dialect == pd[i].dialect) { return pd[i].proto; } } } return PROTOCOL_NONE; }
NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req) { NTSTATUS status; const uint8_t *inbody; const uint8_t *indyn = NULL; DATA_BLOB outbody; DATA_BLOB outdyn; DATA_BLOB negprot_spnego_blob; uint16_t security_offset; DATA_BLOB security_buffer; size_t expected_dyn_size = 0; size_t c; uint16_t security_mode; uint16_t dialect_count; uint16_t in_security_mode; uint32_t in_capabilities; DATA_BLOB in_guid_blob; struct GUID in_guid; uint16_t dialect = 0; uint32_t capabilities; DATA_BLOB out_guid_blob; struct GUID out_guid; enum protocol_types protocol = PROTOCOL_NONE; uint32_t max_limit; uint32_t max_trans = lp_smb2_max_trans(); uint32_t max_read = lp_smb2_max_read(); uint32_t max_write = lp_smb2_max_write(); NTTIME now = timeval_to_nttime(&req->request_time); status = smbd_smb2_request_verify_sizes(req, 0x24); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } inbody = SMBD_SMB2_IN_BODY_PTR(req); dialect_count = SVAL(inbody, 0x02); in_security_mode = SVAL(inbody, 0x04); in_capabilities = IVAL(inbody, 0x08); in_guid_blob = data_blob_const(inbody + 0x0C, 16); if (dialect_count == 0) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } status = GUID_from_ndr_blob(&in_guid_blob, &in_guid); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } expected_dyn_size = dialect_count * 2; if (SMBD_SMB2_IN_DYN_LEN(req) < expected_dyn_size) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } indyn = SMBD_SMB2_IN_DYN_PTR(req); for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB3_00) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB3_00) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB3_DIALECT_REVISION_300) { protocol = PROTOCOL_SMB3_00; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_24) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_24) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_224) { protocol = PROTOCOL_SMB2_24; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_22) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_22) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_222) { protocol = PROTOCOL_SMB2_22; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_10) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_10) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_210) { protocol = PROTOCOL_SMB2_10; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_02) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_02) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_202) { protocol = PROTOCOL_SMB2_02; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_10) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_2FF) { if (req->sconn->smb2.negprot_2ff) { req->sconn->smb2.negprot_2ff = false; protocol = PROTOCOL_SMB2_10; break; } } } if (protocol == PROTOCOL_NONE) { return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED); } if (get_remote_arch() != RA_SAMBA) { set_remote_arch(RA_VISTA); } fstr_sprintf(remote_proto, "SMB%X_%02X", (dialect >> 8) & 0xFF, dialect & 0xFF); reload_services(req->sconn, conn_snum_used, true); DEBUG(3,("Selected protocol %s\n", remote_proto)); /* negprot_spnego() returns a the server guid in the first 16 bytes */ negprot_spnego_blob = negprot_spnego(req, req->sconn); if (negprot_spnego_blob.data == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } if (negprot_spnego_blob.length < 16) { return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR); } security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED; if (lp_server_signing() == SMB_SIGNING_REQUIRED) { security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED; } capabilities = 0; if (lp_host_msdfs()) { capabilities |= SMB2_CAP_DFS; } if ((protocol >= PROTOCOL_SMB2_24) && (lp_smb_encrypt(-1) != SMB_SIGNING_OFF)) { if (in_capabilities & SMB2_CAP_ENCRYPTION) { capabilities |= SMB2_CAP_ENCRYPTION; } } /* * 0x10000 (65536) is the maximum allowed message size * for SMB 2.0 */ max_limit = 0x10000; if (protocol >= PROTOCOL_SMB2_10) { int p = 0; if (tsocket_address_is_inet(req->sconn->local_address, "ip")) { p = tsocket_address_inet_port(req->sconn->local_address); } /* largeMTU is not supported over NBT (tcp port 139) */ if (p != NBT_SMB_PORT) { capabilities |= SMB2_CAP_LARGE_MTU; req->sconn->smb2.supports_multicredit = true; /* SMB >= 2.1 has 1 MB of allowed size */ max_limit = 0x100000; /* 1MB */ } } /* * the defaults are 1MB, but we'll limit this to max_limit based on * the dialect (64kb for SMB2.0, 1MB for SMB2.1 with LargeMTU) * * user configured values exceeding the limits will be overwritten, * only smaller values will be accepted */ max_trans = MIN(max_limit, lp_smb2_max_trans()); max_read = MIN(max_limit, lp_smb2_max_read()); max_write = MIN(max_limit, lp_smb2_max_write()); security_offset = SMB2_HDR_BODY + 0x40; #if 1 /* Try SPNEGO auth... */ security_buffer = data_blob_const(negprot_spnego_blob.data + 16, negprot_spnego_blob.length - 16); #else /* for now we want raw NTLMSSP */ security_buffer = data_blob_const(NULL, 0); #endif out_guid_blob = data_blob_const(negprot_spnego_blob.data, 16); status = GUID_from_ndr_blob(&out_guid_blob, &out_guid); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } outbody = data_blob_talloc(req->out.vector, NULL, 0x40); if (outbody.data == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } SSVAL(outbody.data, 0x00, 0x40 + 1); /* struct size */ SSVAL(outbody.data, 0x02, security_mode); /* security mode */ SSVAL(outbody.data, 0x04, dialect); /* dialect revision */ SSVAL(outbody.data, 0x06, 0); /* reserved */ memcpy(outbody.data + 0x08, out_guid_blob.data, 16); /* server guid */ SIVAL(outbody.data, 0x18, capabilities); /* capabilities */ SIVAL(outbody.data, 0x1C, max_trans); /* max transact size */ SIVAL(outbody.data, 0x20, max_read); /* max read size */ SIVAL(outbody.data, 0x24, max_write); /* max write size */ SBVAL(outbody.data, 0x28, now); /* system time */ SBVAL(outbody.data, 0x30, 0); /* server start time */ SSVAL(outbody.data, 0x38, security_offset); /* security buffer offset */ SSVAL(outbody.data, 0x3A, security_buffer.length); /* security buffer length */ SIVAL(outbody.data, 0x3C, 0); /* reserved */ outdyn = security_buffer; req->sconn->using_smb2 = true; if (dialect != SMB2_DIALECT_REVISION_2FF) { struct smbXsrv_connection *conn = req->sconn->conn; status = smbXsrv_connection_init_tables(conn, protocol); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } conn->smb2.client.capabilities = in_capabilities; conn->smb2.client.security_mode = in_security_mode; conn->smb2.client.guid = in_guid; conn->smb2.client.num_dialects = dialect_count; conn->smb2.client.dialects = talloc_array(conn, uint16_t, dialect_count); if (conn->smb2.client.dialects == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } for (c=0; c < dialect_count; c++) { conn->smb2.client.dialects[c] = SVAL(indyn, c*2); } conn->smb2.server.capabilities = capabilities; conn->smb2.server.security_mode = security_mode; conn->smb2.server.guid = out_guid; conn->smb2.server.dialect = dialect; conn->smb2.server.max_trans = max_trans; conn->smb2.server.max_read = max_read; conn->smb2.server.max_write = max_write; req->sconn->smb2.max_trans = max_trans; req->sconn->smb2.max_read = max_read; req->sconn->smb2.max_write = max_write; } return smbd_smb2_request_done(req, outbody, &outdyn); }
NTSTATUS smbd_smb2_request_process_negprot(struct smbd_smb2_request *req) { NTSTATUS status; const uint8_t *inbody; const uint8_t *indyn = NULL; int i = req->current_idx; DATA_BLOB outbody; DATA_BLOB outdyn; DATA_BLOB negprot_spnego_blob; uint16_t security_offset; DATA_BLOB security_buffer; size_t expected_dyn_size = 0; size_t c; uint16_t security_mode; uint16_t dialect_count; uint16_t dialect = 0; uint32_t capabilities; enum protocol_types protocol = PROTOCOL_NONE; uint32_t max_limit; uint32_t max_trans = lp_smb2_max_trans(); uint32_t max_read = lp_smb2_max_read(); uint32_t max_write = lp_smb2_max_write(); status = smbd_smb2_request_verify_sizes(req, 0x24); if (!NT_STATUS_IS_OK(status)) { return smbd_smb2_request_error(req, status); } inbody = (const uint8_t *)req->in.vector[i+1].iov_base; dialect_count = SVAL(inbody, 0x02); if (dialect_count == 0) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } expected_dyn_size = dialect_count * 2; if (req->in.vector[i+2].iov_len < expected_dyn_size) { return smbd_smb2_request_error(req, NT_STATUS_INVALID_PARAMETER); } indyn = (const uint8_t *)req->in.vector[i+2].iov_base; for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_24) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_24) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_224) { protocol = PROTOCOL_SMB2_24; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_22) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_22) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_222) { protocol = PROTOCOL_SMB2_22; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_10) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_10) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_210) { protocol = PROTOCOL_SMB2_10; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_02) { break; } if (lp_srv_minprotocol() > PROTOCOL_SMB2_02) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_202) { protocol = PROTOCOL_SMB2_02; break; } } for (c=0; protocol == PROTOCOL_NONE && c < dialect_count; c++) { if (lp_srv_maxprotocol() < PROTOCOL_SMB2_10) { break; } dialect = SVAL(indyn, c*2); if (dialect == SMB2_DIALECT_REVISION_2FF) { if (req->sconn->smb2.negprot_2ff) { req->sconn->smb2.negprot_2ff = false; protocol = PROTOCOL_SMB2_10; break; } } } if (protocol == PROTOCOL_NONE) { return smbd_smb2_request_error(req, NT_STATUS_NOT_SUPPORTED); } if (dialect != SMB2_DIALECT_REVISION_2FF) { set_Protocol(protocol); } if (get_remote_arch() != RA_SAMBA) { set_remote_arch(RA_VISTA); } /* negprot_spnego() returns a the server guid in the first 16 bytes */ negprot_spnego_blob = negprot_spnego(req, req->sconn); if (negprot_spnego_blob.data == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } if (negprot_spnego_blob.length < 16) { return smbd_smb2_request_error(req, NT_STATUS_INTERNAL_ERROR); } security_mode = SMB2_NEGOTIATE_SIGNING_ENABLED; if (lp_server_signing() == SMB_SIGNING_REQUIRED) { security_mode |= SMB2_NEGOTIATE_SIGNING_REQUIRED; } capabilities = 0; if (lp_host_msdfs()) { capabilities |= SMB2_CAP_DFS; } /* * 0x10000 (65536) is the maximum allowed message size * for SMB 2.0 */ max_limit = 0x10000; if (protocol >= PROTOCOL_SMB2_10) { /* largeMTU is only available on port 445 */ if (TCP_SMB_PORT == tsocket_address_inet_port(req->sconn->local_address)) { capabilities |= SMB2_CAP_LARGE_MTU; req->sconn->smb2.supports_multicredit = true; /* SMB2.1 has 1 MB of allowed size */ max_limit = 0x100000; /* 1MB */ } } /* * the defaults are 1MB, but we'll limit this to max_limit based on * the dialect (64kb for SMB2.0, 1MB for SMB2.1 with LargeMTU) * * user configured values exceeding the limits will be overwritten, * only smaller values will be accepted */ max_trans = MIN(max_limit, lp_smb2_max_trans()); max_read = MIN(max_limit, lp_smb2_max_read()); max_write = MIN(max_limit, lp_smb2_max_write()); security_offset = SMB2_HDR_BODY + 0x40; #if 1 /* Try SPNEGO auth... */ security_buffer = data_blob_const(negprot_spnego_blob.data + 16, negprot_spnego_blob.length - 16); #else /* for now we want raw NTLMSSP */ security_buffer = data_blob_const(NULL, 0); #endif outbody = data_blob_talloc(req->out.vector, NULL, 0x40); if (outbody.data == NULL) { return smbd_smb2_request_error(req, NT_STATUS_NO_MEMORY); } SSVAL(outbody.data, 0x00, 0x40 + 1); /* struct size */ SSVAL(outbody.data, 0x02, security_mode); /* security mode */ SSVAL(outbody.data, 0x04, dialect); /* dialect revision */ SSVAL(outbody.data, 0x06, 0); /* reserved */ memcpy(outbody.data + 0x08, negprot_spnego_blob.data, 16); /* server guid */ SIVAL(outbody.data, 0x18, capabilities); /* capabilities */ SIVAL(outbody.data, 0x1C, max_trans); /* max transact size */ SIVAL(outbody.data, 0x20, max_read); /* max read size */ SIVAL(outbody.data, 0x24, max_write); /* max write size */ SBVAL(outbody.data, 0x28, 0); /* system time */ SBVAL(outbody.data, 0x30, 0); /* server start time */ SSVAL(outbody.data, 0x38, security_offset); /* security buffer offset */ SSVAL(outbody.data, 0x3A, security_buffer.length); /* security buffer length */ SIVAL(outbody.data, 0x3C, 0); /* reserved */ outdyn = security_buffer; req->sconn->using_smb2 = true; req->sconn->smb2.max_trans = max_trans; req->sconn->smb2.max_read = max_read; req->sconn->smb2.max_write = max_write; return smbd_smb2_request_done(req, outbody, &outdyn); }