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RA_client.cpp
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/*!
*
* RA_client.cpp
*
* Copyright (c) 2020 IWATA Daiki
*
* This software is released under the MIT License.
* see http://opensource.org/licenses/mit-license
*
* Some function are released from Intel Corporation.
* LIENSE: https://github.com/intel/sgx-ra-sample/blob/master/LICENSE
*/
#include "RA_client.hpp"
#include "json.hpp"
using namespace json;
void usage();
#ifndef _WIN32
void cleanup_and_exit(int signo);
#endif
int derive_kdk(EVP_PKEY *Gb, unsigned char kdk[16], sgx_ec256_public_t g_a,
config_t *config);
int process_msg01 (MsgIO *msg, IAS_Connection *ias, sgx_ra_msg1_t *msg1,
sgx_ra_msg2_t *msg2, char **sigrl, config_t *config,
ra_session_t *session);
int process_msg3 (MsgIO *msg, IAS_Connection *ias, sgx_ra_msg1_t *msg1,
ra_msg4_t *msg4, config_t *config, ra_session_t *session);
int get_sigrl (IAS_Connection *ias, int version, sgx_epid_group_id_t gid,
char **sigrl, uint32_t *msg2);
int get_attestation_report(IAS_Connection *ias, int version,
const char *b64quote, sgx_ps_sec_prop_desc_t sec_prop, ra_msg4_t *msg4,
int strict_trust);
int get_proxy(char **server, unsigned int *port, const char *url);
char debug = 0;
char verbose = 0;
/* Need a global for the signal handler */
MsgIO *msgio = NULL; // global variable.
// IWATA
// int main(int argc, char *argv[])
int handshake_RA(int argc, char **argv, ra_session_t& session)
{
char flag_spid = 0;
char flag_pubkey = 0;
char flag_api_key = 0;
char flag_ca = 0;
char flag_usage = 0;
char flag_noproxy= 0;
char flag_prod= 0;
char flag_stdio= 0;
char flag_isv_product_id= 0;
char flag_min_isvsvn= 0;
char flag_mrsigner= 0;
char *sigrl = NULL;
config_t config;
int oops;
IAS_Connection *ias= NULL;
char *port= NULL;
#ifndef _WIN32
struct sigaction sact;
#endif
/* Command line options */
static struct option long_opt[] =
{
{"ias-signing-cafile", required_argument, 0, 'A'},
{"ca-bundle", required_argument, 0, 'B'},
{"no-debug-enclave", no_argument, 0, 'D'},
{"list-agents", no_argument, 0, 'G'},
{"ias-pri-api-key-file", required_argument, 0, 'I'},
{"ias-sec-api-key-file", required_argument, 0, 'J'},
{"service-key-file", required_argument, 0, 'K'},
{"mrsigner", required_argument, 0, 'N'},
{"production", no_argument, 0, 'P'},
{"isv-product-id", required_argument, 0, 'R'},
{"spid-file", required_argument, 0, 'S'},
{"min-isv-svn", required_argument, 0, 'V'},
{"strict-trust-mode", no_argument, 0, 'X'},
{"debug", no_argument, 0, 'd'},
{"user-agent", required_argument, 0, 'g'},
{"help", no_argument, 0, 'h'},
{"ias-pri-api-key", required_argument, 0, 'i'},
{"ias-sec-api-key", required_argument, 0, 'j'},
{"key", required_argument, 0, 'k'},
{"linkable", no_argument, 0, 'l'},
{"proxy", required_argument, 0, 'p'},
{"api-version", required_argument, 0, 'r'},
{"spid", required_argument, 0, 's'},
{"verbose", no_argument, 0, 'v'},
{"no-proxy", no_argument, 0, 'x'},
{"stdio", no_argument, 0, 'z'},
{ 0, 0, 0, 0 }
};
/* Create a logfile to capture debug output and actual msg data */
fplog = create_logfile("sp.log");
fprintf(fplog, "Server log started\n");
/* Config defaults */
memset(&config, 0, sizeof(config));
config.apiver= IAS_API_DEF_VERSION;
/*
* For demo purposes only. A production/release enclave should
* never allow debug-mode enclaves to attest.
*/
config.allow_debug_enclave= 1;
/* Parse our options */
while (1) {
int c;
int opt_index = 0;
off_t offset = IAS_SUBSCRIPTION_KEY_SIZE;
int ret = 0;
char *eptr= NULL;
unsigned long val;
c = getopt_long(argc, argv,
"A:B:DGI:J:K:N:PR:S:V:X:dg:hk:lp:r:s:i:j:vxz",
long_opt, &opt_index);
if (c == -1) break;
switch (c) {
case 0:
break;
case 'A':
if (!cert_load_file(&config.signing_ca, optarg)) {
crypto_perror("cert_load_file");
eprintf("%s: could not load IAS Signing Cert CA\n", optarg);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
config.store = cert_init_ca(config.signing_ca);
if (config.store == NULL) {
eprintf("%s: could not initialize certificate store\n", optarg);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
++flag_ca;
break;
case 'B':
config.ca_bundle = strdup(optarg);
if (config.ca_bundle == NULL) {
perror("strdup");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 'D':
config.allow_debug_enclave= 0;
break;
case 'G':
ias_list_agents(stdout);
// IWATA
// return 1;
msgio = NULL;
return -1;
case 'I':
// Get Size of File, should be IAS_SUBSCRIPTION_KEY_SIZE + EOF
ret = from_file(NULL, optarg, &offset);
if ((offset != IAS_SUBSCRIPTION_KEY_SIZE+1) || (ret == 0)) {
eprintf("IAS Primary Subscription Key must be %d-byte hex string.\n",
IAS_SUBSCRIPTION_KEY_SIZE);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
// Remove the EOF
offset--;
// Read the contents of the file
if (!from_file((unsigned char *)&config.pri_subscription_key, optarg, &offset)) {
eprintf("IAS Primary Subscription Key must be %d-byte hex string.\n",
IAS_SUBSCRIPTION_KEY_SIZE);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 'J':
// Get Size of File, should be IAS_SUBSCRIPTION_KEY_SIZE + EOF
ret = from_file(NULL, optarg, &offset);
if ((offset != IAS_SUBSCRIPTION_KEY_SIZE+1) || (ret == 0)) {
eprintf("IAS Secondary Subscription Key must be %d-byte hex string.\n",
IAS_SUBSCRIPTION_KEY_SIZE);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
// Remove the EOF
offset--;
// Read the contents of the file
if (!from_file((unsigned char *)&config.sec_subscription_key, optarg, &offset)) {
eprintf("IAS Secondary Subscription Key must be %d-byte hex string.\n",
IAS_SUBSCRIPTION_KEY_SIZE);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 'K':
if (!key_load_file(&config.service_private_key, optarg, KEY_PRIVATE)) {
crypto_perror("key_load_file");
eprintf("%s: could not load EC private key\n", optarg);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 'N':
if (!from_hexstring((unsigned char *)&config.req_mrsigner,
optarg, 32)) {
eprintf("MRSIGNER must be 64-byte hex string\n");
// IWATA
// return 1;
return -1;
}
++flag_mrsigner;
break;
case 'P':
flag_prod = 1;
break;
case 'R':
eptr= NULL;
val= strtoul(optarg, &eptr, 10);
if ( *eptr != '\0' || val > 0xFFFF ) {
eprintf("Product Id must be a positive integer <= 65535\n");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
config.req_isv_product_id= val;
++flag_isv_product_id;
break;
case 'S':
if (!from_hexstring_file((unsigned char *)&config.spid, optarg, 16)) {
eprintf("SPID must be 32-byte hex string\n");
// IWATA
// return 1;
return -1;
}
++flag_spid;
break;
case 'V':
eptr= NULL;
val= strtoul(optarg, &eptr, 10);
if ( *eptr != '\0' || val > (unsigned long) 0xFFFF ) {
eprintf("Minimum ISV SVN must be a positive integer <= 65535\n");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
config.min_isvsvn= val;
++flag_min_isvsvn;
break;
case 'X':
config.strict_trust= 1;
break;
case 'd':
debug = 1;
break;
case 'g':
config.user_agent= strdup(optarg);
if ( config.user_agent == NULL ) {
perror("malloc");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 'i':
if (strlen(optarg) != IAS_SUBSCRIPTION_KEY_SIZE) {
eprintf("IAS Subscription Key must be %d-byte hex string\n",IAS_SUBSCRIPTION_KEY_SIZE);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
strncpy((char *) config.pri_subscription_key, optarg, IAS_SUBSCRIPTION_KEY_SIZE);
break;
case 'j':
if (strlen(optarg) != IAS_SUBSCRIPTION_KEY_SIZE) {
eprintf("IAS Secondary Subscription Key must be %d-byte hex string\n",
IAS_SUBSCRIPTION_KEY_SIZE);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
strncpy((char *) config.sec_subscription_key, optarg, IAS_SUBSCRIPTION_KEY_SIZE);
break;
case 'k':
if (!key_load(&config.service_private_key, optarg, KEY_PRIVATE)) {
crypto_perror("key_load");
eprintf("%s: could not load EC private key\n", optarg);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 'l':
config.quote_type = SGX_LINKABLE_SIGNATURE;
break;
case 'p':
if ( flag_noproxy ) usage();
if (!get_proxy(&config.proxy_server, &config.proxy_port, optarg)) {
eprintf("%s: could not extract proxy info\n", optarg);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
// Break the URL into host and port. This is a simplistic algorithm.
break;
case 'r':
config.apiver= atoi(optarg);
if ( config.apiver < IAS_MIN_VERSION || config.apiver >
IAS_MAX_VERSION ) {
eprintf("version must be between %d and %d\n",
IAS_MIN_VERSION, IAS_MAX_VERSION);
// IWATA
// return 1;
msgio = NULL;
return -1;
}
break;
case 's':
if (strlen(optarg) < 32) {
eprintf("SPID must be 32-byte hex string\n");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
if (!from_hexstring((unsigned char *)&config.spid, (unsigned char *)optarg, 16)) {
eprintf("SPID must be 32-byte hex string\n");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
++flag_spid;
break;
case 'v':
verbose = 1;
break;
case 'x':
if ( config.proxy_server != NULL ) usage();
flag_noproxy=1;
break;
case 'z':
flag_stdio= 1;
break;
case 'h':
case '?':
default:
usage();
}
}
/* We should have zero or one command-line argument remaining */
argc-= optind;
if ( argc > 1 ) usage();
/* The remaining argument, if present, is the port number. */
if ( flag_stdio && argc ) {
usage();
} else if ( argc ) {
port= argv[optind];
} else {
port= strdup(DEFAULT_PORT);
if ( port == NULL ) {
perror("strdup");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
}
if ( debug ) {
eprintf("+++ IAS Primary Subscription Key set to '%c%c%c%c........................%c%c%c%c'\n",
config.pri_subscription_key[0],
config.pri_subscription_key[1],
config.pri_subscription_key[2],
config.pri_subscription_key[3],
config.pri_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -4 ],
config.pri_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -3 ],
config.pri_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -2 ],
config.pri_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -1 ]
);
eprintf("+++ IAS Secondary Subscription Key set to '%c%c%c%c........................%c%c%c%c'\n",
config.sec_subscription_key[0],
config.sec_subscription_key[1],
config.sec_subscription_key[2],
config.sec_subscription_key[3],
config.sec_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -4 ],
config.sec_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -3 ],
config.sec_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -2 ],
config.sec_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE -1 ]
);
}
/* Use the default CA bundle unless one is provided */
if ( config.ca_bundle == NULL ) {
config.ca_bundle= strdup(DEFAULT_CA_BUNDLE);
if ( config.ca_bundle == NULL ) {
perror("strdup");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
if ( debug ) eprintf("+++ Using default CA bundle %s\n",
config.ca_bundle);
}
/*
* Use the hardcoded default key unless one is provided on the
* command line. Most real-world services would hardcode the
* key since the public half is also hardcoded into the enclave.
*/
if (config.service_private_key == NULL) {
if (debug) {
eprintf("Using default private key\n");
}
config.service_private_key = key_private_from_bytes(def_service_private_key);
if (config.service_private_key == NULL) {
crypto_perror("key_private_from_bytes");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
}
if (debug) {
eprintf("+++ using private key:\n");
PEM_write_PrivateKey(stderr, config.service_private_key, NULL,
NULL, 0, 0, NULL);
PEM_write_PrivateKey(fplog, config.service_private_key, NULL,
NULL, 0, 0, NULL);
}
if (!flag_spid) {
eprintf("--spid or --spid-file is required\n");
flag_usage = 1;
}
if (!flag_ca) {
eprintf("--ias-signing-cafile is required\n");
flag_usage = 1;
}
if ( ! flag_isv_product_id ) {
eprintf("--isv-product-id is required\n");
flag_usage = 1;
}
if ( ! flag_min_isvsvn ) {
eprintf("--min-isvsvn is required\n");
flag_usage = 1;
}
if ( ! flag_mrsigner ) {
eprintf("--mrsigner is required\n");
flag_usage = 1;
}
if (flag_usage) usage();
/* Initialize out support libraries */
crypto_init();
/* Initialize our IAS request object */
try {
ias = new IAS_Connection(
(flag_prod) ? IAS_SERVER_PRODUCTION : IAS_SERVER_DEVELOPMENT,
0,
(char *)(config.pri_subscription_key),
(char *)(config.sec_subscription_key)
);
}
catch (...) {
oops = 1;
eprintf("exception while creating IAS request object\n");
// IWATA
// return 1;
msgio = NULL;
return -1;
}
if ( flag_noproxy ) ias->proxy_mode(IAS_PROXY_NONE);
else if (config.proxy_server != NULL) {
ias->proxy_mode(IAS_PROXY_FORCE);
ias->proxy(config.proxy_server, config.proxy_port);
}
if ( config.user_agent != NULL ) {
if ( ! ias->agent(config.user_agent) ) {
eprintf("%s: unknown user agent\n", config.user_agent);
// IWATA
msgio = NULL;
return 0;
}
}
/*
* Set the cert store for this connection. This is used for verifying
* the IAS signing certificate, not the TLS connection with IAS (the
* latter is handled using config.ca_bundle).
*/
ias->cert_store(config.store);
/*
* Set the CA bundle for verifying the IAS server certificate used
* for the TLS session. If this isn't set, then the user agent
* will fall back to it's default.
*/
if ( strlen(config.ca_bundle) ) ias->ca_bundle(config.ca_bundle);
/* Get our message IO object. */
if ( flag_stdio ) {
msgio= new MsgIO();
} else {
try {
// KS
// msgio = new MsgIO(NULL, (port == NULL) ? DEFAULT_PORT : port);
msgio = new MsgIO("localhost", (port == NULL) ? DEFAULT_PORT : port);
}
catch(...) {
// IWATA
// return 1;
msgio = NULL;
return -1;
}
}
#ifndef _WIN32
/*
* Install some rudimentary signal handlers. We just want to make
* sure we gracefully shutdown the listen socket before we exit
* to avoid "address already in use" errors on startup.
*/
sigemptyset(&sact.sa_mask);
sact.sa_flags = 0;
sact.sa_handler = &cleanup_and_exit;
if ( sigaction(SIGHUP, &sact, NULL) == -1 ) perror("sigaction: SIGHUP");
if ( sigaction(SIGINT, &sact, NULL) == -1 ) perror("sigaction: SIGHUP");
if ( sigaction(SIGTERM, &sact, NULL) == -1 ) perror("sigaction: SIGHUP");
if ( sigaction(SIGQUIT, &sact, NULL) == -1 ) perror("sigaction: SIGHUP");
#endif
/* If we're running in server mode, we'll block here. */
//KS while ( msgio->server_loop() ) {
// IWATA ra_session_t session;
sgx_ra_msg1_t msg1;
sgx_ra_msg2_t msg2;
ra_msg4_t msg4;
memset(&session, 0, sizeof(ra_session_t));
/* Read message 0 and 1, then generate message 2 */
if ( ! process_msg01(msgio, ias, &msg1, &msg2, &sigrl, &config,
&session) ) {
eprintf("error processing msg1\n");
// IWATA
// goto disconnect;
return -2;
}
/* Send message 2 */
/*
* sgx_ra_msg2_t is a struct with a flexible array member at the
* end (defined as uint8_t sig_rl[]). We could go to all the
* trouble of building a byte array large enough to hold the
* entire struct and then cast it as (sgx_ra_msg2_t) but that's
* a lot of work for no gain when we can just send the fixed
* portion and the array portion by hand.
*/
dividerWithText(stderr, "Copy/Paste Msg2 Below to Client");
dividerWithText(fplog, "Msg2 (send to Client)");
msgio->send_partial((void *) &msg2, sizeof(sgx_ra_msg2_t));
fsend_msg_partial(fplog, (void *) &msg2, sizeof(sgx_ra_msg2_t));
msgio->send(&msg2.sig_rl, msg2.sig_rl_size);
fsend_msg(fplog, &msg2.sig_rl, msg2.sig_rl_size);
edivider();
/* Read message 3, and generate message 4 */
if ( ! process_msg3(msgio, ias, &msg1, &msg4, &config, &session) ) {
eprintf("error processing msg3\n");
// IWATA
// goto disconnect;
return -2;
}
// IWATA
// disconnect:
//KS msgio->disconnect();
//KS while end }
// IWATA crypto_destroy();
return 1;
}
int process_msg3 (MsgIO *msgio, IAS_Connection *ias, sgx_ra_msg1_t *msg1,
ra_msg4_t *msg4, config_t *config, ra_session_t *session)
{
sgx_ra_msg3_t *msg3;
size_t blen= 0;
size_t sz;
int rv;
uint32_t quote_sz;
char *buffer= NULL;
char *b64quote;
sgx_mac_t vrfymac;
sgx_quote_t *q;
/*
* Read our incoming message. We're using base16 encoding/hex strings
* so we should end up with sizeof(msg)*2 bytes.
*/
fprintf(stderr, "Waiting for msg3\n");
/*
* Read message 3
*
* CMACsmk(M) || M
*
* where
*
* M = ga || PS_SECURITY_PROPERTY || QUOTE
*
*/
rv= msgio->read((void **) &msg3, &sz);
if ( rv == -1 ) {
eprintf("system error reading msg3\n");
return 0;
} else if ( rv == 0 ) {
eprintf("protocol error reading msg3\n");
return 0;
}
if ( debug ) {
eprintf("+++ read %lu bytes\n", sz);
}
/*
* The quote size will be the total msg3 size - sizeof(sgx_ra_msg3_t)
* since msg3.quote is a flexible array member.
*
* Total message size is sz/2 since the income message is in base16.
*/
quote_sz = (uint32_t)((sz / 2) - sizeof(sgx_ra_msg3_t));
if ( debug ) {
eprintf("+++ quote_sz= %lu bytes\n", quote_sz);
}
/* Make sure Ga matches msg1 */
if ( debug ) {
eprintf("+++ Verifying msg3.g_a matches msg1.g_a\n");
eprintf("msg1.g_a.gx = %s\n",
hexstring(msg3->g_a.gx, sizeof(msg1->g_a.gx)));
eprintf("msg1.g_a.gy = %s\n",
hexstring(&msg3->g_a.gy, sizeof(msg1->g_a.gy)));
eprintf("msg3.g_a.gx = %s\n",
hexstring(msg3->g_a.gx, sizeof(msg3->g_a.gx)));
eprintf("msg3.g_a.gy = %s\n",
hexstring(&msg3->g_a.gy, sizeof(msg3->g_a.gy)));
}
if ( CRYPTO_memcmp(&msg3->g_a, &msg1->g_a, sizeof(sgx_ec256_public_t)) ) {
eprintf("msg1.g_a and mgs3.g_a keys don't match\n");
free(msg3);
return 0;
}
/* Validate the MAC of M */
cmac128(session->smk, (unsigned char *) &msg3->g_a,
sizeof(sgx_ra_msg3_t)-sizeof(sgx_mac_t)+quote_sz,
(unsigned char *) vrfymac);
if ( debug ) {
eprintf("+++ Validating MACsmk(M)\n");
eprintf("msg3.mac = %s\n", hexstring(msg3->mac, sizeof(sgx_mac_t)));
eprintf("calculated = %s\n", hexstring(vrfymac, sizeof(sgx_mac_t)));
}
if ( CRYPTO_memcmp(msg3->mac, vrfymac, sizeof(sgx_mac_t)) ) {
eprintf("Failed to verify msg3 MAC\n");
free(msg3);
return 0;
}
/* Encode the report body as base64 */
b64quote= base64_encode((char *) &msg3->quote, quote_sz);
if ( b64quote == NULL ) {
eprintf("Could not base64 encode the quote\n");
free(msg3);
return 0;
}
q= (sgx_quote_t *) msg3->quote;
if ( verbose ) {
edividerWithText("Msg3 Details (from Client)");
eprintf("msg3.mac = %s\n",
hexstring(&msg3->mac, sizeof(msg3->mac)));
eprintf("msg3.g_a.gx = %s\n",
hexstring(msg3->g_a.gx, sizeof(msg3->g_a.gx)));
eprintf("msg3.g_a.gy = %s\n",
hexstring(&msg3->g_a.gy, sizeof(msg3->g_a.gy)));
eprintf("msg3.ps_sec_prop = %s\n",
hexstring(&msg3->ps_sec_prop, sizeof(msg3->ps_sec_prop)));
eprintf("msg3.quote.version = %s\n",
hexstring(&q->version, sizeof(uint16_t)));
eprintf("msg3.quote.sign_type = %s\n",
hexstring(&q->sign_type, sizeof(uint16_t)));
eprintf("msg3.quote.epid_group_id = %s\n",
hexstring(&q->epid_group_id, sizeof(sgx_epid_group_id_t)));
eprintf("msg3.quote.qe_svn = %s\n",
hexstring(&q->qe_svn, sizeof(sgx_isv_svn_t)));
eprintf("msg3.quote.pce_svn = %s\n",
hexstring(&q->pce_svn, sizeof(sgx_isv_svn_t)));
eprintf("msg3.quote.xeid = %s\n",
hexstring(&q->xeid, sizeof(uint32_t)));
eprintf("msg3.quote.basename = %s\n",
hexstring(&q->basename, sizeof(sgx_basename_t)));
eprintf("msg3.quote.report_body = %s\n",
hexstring(&q->report_body, sizeof(sgx_report_body_t)));
eprintf("msg3.quote.signature_len = %s\n",
hexstring(&q->signature_len, sizeof(uint32_t)));
eprintf("msg3.quote.signature = %s\n",
hexstring(&q->signature, q->signature_len));
edividerWithText("Enclave Quote (base64) ==> Send to IAS");
eputs(b64quote);
eprintf("\n");
edivider();
}
/* Verify that the EPID group ID in the quote matches the one from msg1 */
if ( debug ) {
eprintf("+++ Validating quote's epid_group_id against msg1\n");
eprintf("msg1.egid = %s\n",
hexstring(msg1->gid, sizeof(sgx_epid_group_id_t)));
eprintf("msg3.quote.epid_group_id = %s\n",
hexstring(&q->epid_group_id, sizeof(sgx_epid_group_id_t)));
}
if ( memcmp(msg1->gid, &q->epid_group_id, sizeof(sgx_epid_group_id_t)) ) {
eprintf("EPID GID mismatch. Attestation failed.\n");
free(b64quote);
free(msg3);
return 0;
}
if ( get_attestation_report(ias, config->apiver, b64quote,
msg3->ps_sec_prop, msg4, config->strict_trust) ) {
unsigned char vfy_rdata[64];
unsigned char msg_rdata[144]; /* for Ga || Gb || VK */
sgx_report_body_t *r= (sgx_report_body_t *) &q->report_body;
memset(vfy_rdata, 0, 64);
/*
* Verify that the first 64 bytes of the report data (inside
* the quote) are SHA256(Ga||Gb||VK) || 0x00[32]
*
* VK = CMACkdk( 0x01 || "VK" || 0x00 || 0x80 || 0x00 )
*
* where || denotes concatenation.
*/
/* Derive VK */
cmac128(session->kdk, (unsigned char *)("\x01VK\x00\x80\x00"),
6, session->vk);
/* Build our plaintext */
memcpy(msg_rdata, session->g_a, 64);
memcpy(&msg_rdata[64], session->g_b, 64);
memcpy(&msg_rdata[128], session->vk, 16);
/* SHA-256 hash */
sha256_digest(msg_rdata, 144, vfy_rdata);
if ( verbose ) {
edividerWithText("Enclave Report Verification");
if ( debug ) {
eprintf("VK = %s\n",
hexstring(session->vk, 16));
}
eprintf("SHA256(Ga||Gb||VK) = %s\n",
hexstring(vfy_rdata, 32));
eprintf("report_data[64] = %s\n",
hexstring(&r->report_data, 64));
}
if ( CRYPTO_memcmp((void *) vfy_rdata, (void *) &r->report_data,
64) ) {
eprintf("Report verification failed.\n");
free(b64quote);
free(msg3);
return 0;
}
/*
* The service provider must validate that the enclave
* report is from an enclave that they recognize. Namely,
* that the MRSIGNER matches our signing key, and the MRENCLAVE
* hash matches an enclave that we compiled.
*
* Other policy decisions might include examining ISV_SVN to
* prevent outdated/deprecated software from successfully
* attesting, and ensuring the TCB is not out of date.
*
* A real-world service provider might allow multiple ISV_SVN
* values, but for this sample we only allow the enclave that
* is compiled.
*/
#ifndef _WIN32
/* Windows implementation is not available yet */
if ( ! verify_enclave_identity(config->req_mrsigner,
config->req_isv_product_id, config->min_isvsvn,
config->allow_debug_enclave, r) ) {
eprintf("Invalid enclave.\n");
msg4->status= NotTrusted;
}
#endif
if ( verbose ) {
edivider();
// The enclave report is valid so we can trust the report
// data.
edividerWithText("Enclave Report Details");
eprintf("cpu_svn = %s\n",
hexstring(&r->cpu_svn, sizeof(sgx_cpu_svn_t)));
eprintf("misc_select = %s\n",
hexstring(&r->misc_select, sizeof(sgx_misc_select_t)));
eprintf("attributes = %s\n",
hexstring(&r->attributes, sizeof(sgx_attributes_t)));
eprintf("mr_enclave = %s\n",
hexstring(&r->mr_enclave, sizeof(sgx_measurement_t)));
eprintf("mr_signer = %s\n",
hexstring(&r->mr_signer, sizeof(sgx_measurement_t)));
eprintf("isv_prod_id = %04hX\n", r->isv_prod_id);
eprintf("isv_svn = %04hX\n", r->isv_svn);
eprintf("report_data = %s\n",
hexstring(&r->report_data, sizeof(sgx_report_data_t)));
}
edividerWithText("Copy/Paste Msg4 Below to Client");
/* Serialize the members of the Msg4 structure independently */
/* vs. the entire structure as one send_msg() */
msgio->send_partial(&msg4->status, sizeof(msg4->status));