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sp.cpp
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sp.cpp
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/*
Copyright 2019 Intel Corporation
This software and the related documents are Intel copyrighted materials,
and your use of them is governed by the express license under which they
were provided to you (License). Unless the License provides otherwise,
you may not use, modify, copy, publish, distribute, disclose or transmit
this software or the related documents without Intel's prior written
permission.
This software and the related documents are provided as is, with no
express or implied warranties, other than those that are expressly stated
in the License.
*/
#ifndef _WIN32
#include "config.h"
#endif
#include <stdlib.h>
#include <limits.h>
#include <stdio.h>
#include <sys/stat.h>
#include <string.h>
#include <sys/types.h>
#ifdef _WIN32
#include <intrin.h>
#include <openssl/applink.c>
#include "win32/getopt.h"
#else
#include <signal.h>
#include <getopt.h>
#include <unistd.h>
#endif
#include <sgx_key_exchange.h>
#include <sgx_report.h>
#include <openssl/evp.h>
#include <openssl/pem.h>
#include "json.hpp"
#include "common.h"
#include "hexutil.h"
#include "fileio.h"
#include "crypto.h"
#include "byteorder.h"
#include "msgio.h"
#include "protocol.h"
#include "base64.h"
#include "iasrequest.h"
#include "logfile.h"
#include "settings.h"
#include "enclave_verify.h"
using namespace json;
using namespace std;
#include <map>
#include <string>
#include <iostream>
#include <algorithm>
#ifdef _WIN32
#define strdup(x) _strdup(x)
#endif
static const unsigned char def_service_private_key[32] = {
0x90, 0xe7, 0x6c, 0xbb, 0x2d, 0x52, 0xa1, 0xce,
0x3b, 0x66, 0xde, 0x11, 0x43, 0x9c, 0x87, 0xec,
0x1f, 0x86, 0x6a, 0x3b, 0x65, 0xb6, 0xae, 0xea,
0xad, 0x57, 0x34, 0x53, 0xd1, 0x03, 0x8c, 0x01
};
typedef struct ra_session_struct {
unsigned char g_a[64];
unsigned char g_b[64];
unsigned char kdk[16];
unsigned char smk[16];
unsigned char sk[16];
unsigned char mk[16];
unsigned char vk[16];
} ra_session_t;
typedef struct config_struct {
sgx_spid_t spid;
unsigned char pri_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE+1];
unsigned char sec_subscription_key[IAS_SUBSCRIPTION_KEY_SIZE+1];
uint16_t quote_type;
EVP_PKEY *service_private_key;
char *proxy_server;
char *ca_bundle;
char *user_agent;
unsigned int proxy_port;
unsigned char kdk[16];
X509_STORE *store;
X509 *signing_ca;
unsigned int apiver;
int strict_trust;
sgx_measurement_t req_mrsigner;
sgx_prod_id_t req_isv_product_id;
sgx_isv_svn_t min_isvsvn;
int allow_debug_enclave;
} config_t;
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;
int main(int argc, char *argv[])
{
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);
return 1;
}
config.store = cert_init_ca(config.signing_ca);
if (config.store == NULL) {
eprintf("%s: could not initialize certificate store\n", optarg);
return 1;
}
++flag_ca;
break;
case 'B':
config.ca_bundle = strdup(optarg);
if (config.ca_bundle == NULL) {
perror("strdup");
return 1;
}
break;
case 'D':
config.allow_debug_enclave= 0;
break;
case 'G':
ias_list_agents(stdout);
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);
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);
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);
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);
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);
return 1;
}
break;
case 'N':
if (!from_hexstring((unsigned char *)&config.req_mrsigner,
optarg, 32)) {
eprintf("MRSIGNER must be 64-byte hex string\n");
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");
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");
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");
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");
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);
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);
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);
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);
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);
return 1;
}
break;
case 's':
if (strlen(optarg) < 32) {
eprintf("SPID must be 32-byte hex string\n");
return 1;
}
if (!from_hexstring((unsigned char *)&config.spid, (unsigned char *)optarg, 16)) {
eprintf("SPID must be 32-byte hex string\n");
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");
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");
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");
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");
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);
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 {
msgio= new MsgIO(NULL, (port == NULL) ? DEFAULT_PORT : port);
}
catch(...) {
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. */
while ( msgio->server_loop() ) {
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");
goto disconnect;
}
/* 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(sigrl, msg2.sig_rl_size);
fsend_msg(fplog, sigrl, 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");
goto disconnect;
}
disconnect:
msgio->disconnect();
}
crypto_destroy();
return 0;
}
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(&msg1->g_a.gx, sizeof(msg1->g_a.gx)));
eprintf("msg1.g_a.gy = %s\n",
hexstring(&msg1->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));
msgio->send(&msg4->platformInfoBlob, sizeof(msg4->platformInfoBlob));
fsend_msg_partial(fplog, &msg4->status, sizeof(msg4->status));
fsend_msg(fplog, &msg4->platformInfoBlob,
sizeof(msg4->platformInfoBlob));
edivider();
/*
* If the enclave is trusted, derive the MK and SK. Also get
* SHA256 hashes of these so we can verify there's a shared
* secret between us and the client.
*/
if ( msg4->status == Trusted ) {
unsigned char hashmk[32], hashsk[32];
if ( debug ) eprintf("+++ Deriving the MK and SK\n");
cmac128(session->kdk, (unsigned char *)("\x01MK\x00\x80\x00"),
6, session->mk);
cmac128(session->kdk, (unsigned char *)("\x01SK\x00\x80\x00"),
6, session->sk);
sha256_digest(session->mk, 16, hashmk);
sha256_digest(session->sk, 16, hashsk);
if ( verbose ) {
if ( debug ) {
eprintf("MK = %s\n", hexstring(session->mk, 16));
eprintf("SK = %s\n", hexstring(session->sk, 16));
}
eprintf("SHA256(MK) = %s\n", hexstring(hashmk, 32));
eprintf("SHA256(SK) = %s\n", hexstring(hashsk, 32));