/* * Copyright (C) 2011-2017 Intel Corporation. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in * the documentation and/or other materials provided with the * distribution. * * Neither the name of Intel Corporation nor the names of its * contributors may be used to endorse or promote products derived * from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * */ /** * File: helper.cpp * Description: Cpp file to some helper function to extract some enclave information * * Wrap functions to get PPID, PWK, PSID, PSVN, PSK and seal/unseal function */ #include "helper.h" #include "string.h" #include "sgx_error.h" #include "sgx_utils.h" #include "cipher.h" #include "sgx_trts.h" #include "sgx_tcrypto.h" #include #include "byte_order.h" #include "util.h" //Function to get provisioning key using the provided PSVN //If the psvn is NULL, both CPUSVN and ISVSVN is set to 0 (used for PPID generation only) //Input: psvn, the psvn used to generate provisioning key //Output: key, the provisioning key to return // return PVEC_SUCCESS on success static pve_status_t get_provision_key(sgx_key_128bit_t *key, const psvn_t *psvn) { sgx_status_t se_ret = SGX_SUCCESS; sgx_key_request_t wrap_key_req; //memset here will also set cpusvn isvsvn to 0 for the case when psvn==NULL memset(&wrap_key_req, 0, sizeof(sgx_key_request_t)); if(psvn==NULL){ //keeping isv_svn and cpu_svn all 0 according to spec (this is for calcuation of PPID) }else{ memcpy(&wrap_key_req.cpu_svn, &psvn->cpu_svn, sizeof(wrap_key_req.cpu_svn)); memcpy(&wrap_key_req.isv_svn, &psvn->isv_svn, sizeof(wrap_key_req.isv_svn)); } wrap_key_req.key_name = SGX_KEYSELECT_PROVISION; //provisioning key wrap_key_req.attribute_mask.xfrm = 0; wrap_key_req.misc_mask = 0xFFFFFFFF; wrap_key_req.attribute_mask.flags = ~SGX_FLAGS_MODE64BIT; //set all bits except the SGX_FLAGS_MODE64BIT se_ret = sgx_get_key(&wrap_key_req, key); if(SGX_SUCCESS != se_ret) { return sgx_error_to_pve_error(se_ret); } return PVEC_SUCCESS; } pve_status_t get_ppid(ppid_t* ppid) { sgx_key_128bit_t key_tmp; sgx_status_t sgx_status = SGX_SUCCESS; memset(&key_tmp, 0, sizeof(key_tmp)); //get Provisioning Key with both CPUSVN and ISVSVN set to 0 pve_status_t status = get_provision_key(&key_tmp, NULL); if(status != PVEC_SUCCESS){ (void)memset_s(&key_tmp,sizeof(key_tmp), 0, sizeof(key_tmp)); return status; } uint8_t content[16]; memset(&content, 0, sizeof(content)); //generate the mac as PPID se_static_assert(sizeof(sgx_cmac_128bit_key_t) == sizeof(sgx_key_128bit_t)); /*size of sgx_cmac_128bit_key_t and sgx_key_128bit_t should be same*/ se_static_assert(sizeof(sgx_cmac_128bit_tag_t) == sizeof(ppid_t)); /*size of sgx_cmac_128bit_tag_t and ppit_t should be same*/ if((sgx_status=sgx_rijndael128_cmac_msg(reinterpret_cast(&key_tmp), content, sizeof(content), reinterpret_cast(ppid)))!=SGX_SUCCESS){ status = sgx_error_to_pve_error(sgx_status); }else{ status = PVEC_SUCCESS; } (void)memset_s(&key_tmp,sizeof(key_tmp), 0, sizeof(key_tmp));//clear provisioning key in stack return status; } #define PROV_WRAP_2 "PROV_WRAP_2" #define PROV_WRAP_2_LEN 11 #define START_OFF_PROV_WRAP_2 1 #define START_OFF_NONCE_2 14 #define OFF_BYTE_ZERO 30 #define OFF_BYTE_0X80 31 //Get Provisioning Wrap2 Key with respect to the PSVN pve_status_t get_pwk2( const psvn_t* psvn, const uint8_t n2[NONCE_2_SIZE], sgx_key_128bit_t* wrap_key) { if( psvn == NULL) return PVEC_PARAMETER_ERROR; uint8_t content[32]; sgx_status_t sgx_status = SGX_SUCCESS; sgx_key_128bit_t key_tmp; pve_status_t status = PVEC_SUCCESS; memset(&key_tmp, 0, sizeof(key_tmp)); status = get_provision_key(&key_tmp, psvn); //Generate Provisioning Key with respect to the psvn if(status != PVEC_SUCCESS) goto ret_point; memset(&content, 0, sizeof(content)); content[0] = 0x01; memcpy(&content[START_OFF_PROV_WRAP_2], PROV_WRAP_2, PROV_WRAP_2_LEN); // byte 1-11 : "PROV_WRAP_2" (ascii encoded) memcpy(&content[START_OFF_NONCE_2], n2, NONCE_2_SIZE); content[OFF_BYTE_ZERO] = 0x00; //fill zero in byte offset 30 content[OFF_BYTE_0X80] = 0x80; //fill 0x80 in byte offset 31 //get the cmac of provision key as PWK2 se_static_assert(sizeof(sgx_cmac_128bit_key_t)==sizeof(key_tmp)); /*size of sgx_cmac_128bit_key_t should be same as sgx_key_128bit_t*/ se_static_assert(sizeof(sgx_cmac_128bit_tag_t)==sizeof(sgx_key_128bit_t)); /*size of sgx_cmac_128bit_tag_t should be same as sgx_key_128bit_t*/ if((sgx_status = sgx_rijndael128_cmac_msg(reinterpret_cast(&key_tmp), reinterpret_cast(content), sizeof(content), reinterpret_cast(wrap_key)))!=SGX_SUCCESS){ status = sgx_error_to_pve_error(sgx_status); }else{ status = PVEC_SUCCESS; } ret_point: (void)memset_s(&key_tmp,sizeof(key_tmp), 0 ,sizeof(key_tmp)); //clear provisioninig key in stack return status; } //Function to generate Provisioning Sealing Key given the psvn //The key is used to seal the private parameter f before sending to backend server pve_status_t get_pve_psk( const psvn_t* psvn, sgx_key_128bit_t* seal_key) { sgx_status_t se_ret = SGX_SUCCESS; sgx_key_request_t seal_key_req; if(psvn == NULL) return PVEC_PARAMETER_ERROR; memset(&seal_key_req, 0, sizeof(sgx_key_request_t)); memcpy(&seal_key_req.cpu_svn, &psvn->cpu_svn, SGX_CPUSVN_SIZE); memcpy(&seal_key_req.isv_svn, &psvn->isv_svn, sizeof(psvn->isv_svn)); seal_key_req.key_name = SGX_KEYSELECT_PROVISION_SEAL; //provisioning sealling key seal_key_req.attribute_mask.xfrm = 0; seal_key_req.attribute_mask.flags = ~SGX_FLAGS_MODE64BIT; se_ret = sgx_get_key(&seal_key_req, seal_key); if(SGX_SUCCESS != se_ret) { return sgx_error_to_pve_error(se_ret); } return PVEC_SUCCESS; } //simple wrapper for memcpy but checking type of parameter void pve_memcpy_out(external_memory_byte_t *dst, const void *src, uint32_t size) { memcpy(dst, src, size); } void pve_memcpy_in(void *dst, const external_memory_byte_t *src, uint32_t size) { memcpy(dst, src, size); } pve_status_t se_read_rand_error_to_pve_error(sgx_status_t error) { if(error == SGX_SUCCESS)return PVEC_SUCCESS; else if(error == SGX_ERROR_INVALID_PARAMETER) return PVEC_UNEXPECTED_ERROR; else return PVEC_READ_RAND_ERROR; //read rand hardware error } pve_status_t epid_error_to_pve_error(EpidStatus epid_result) { if(kEpidNoErr == epid_result) return PVEC_SUCCESS; switch(epid_result){ case kEpidMemAllocErr: case kEpidNoMemErr: return PVEC_MALLOC_ERROR; case kEpidSigInvalid: return PVEC_INVALID_EPID_KEY; default: return PVEC_EPID_ERROR; } } pve_status_t sgx_error_to_pve_error(sgx_status_t status) { switch(status){ case SGX_SUCCESS: return PVEC_SUCCESS; case SGX_ERROR_OUT_OF_MEMORY: return PVEC_MALLOC_ERROR; case SGX_ERROR_INVALID_CPUSVN: case SGX_ERROR_INVALID_ISVSVN: return PVEC_INVALID_CPU_ISV_SVN; default: return PVEC_SE_ERROR; } }