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sp.cpp
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/*
Copyright 2018 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 <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"
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;
uint16_t quote_type;
EVP_PKEY *service_private_key;
char *proxy_server;
char *ca_bundle;
char *user_agent;
char *cert_file;
char *cert_key_file;
char *cert_passwd_file;
unsigned int proxy_port;
char *cert_type[4];
X509_STORE *store;
X509 *signing_ca;
unsigned int apiver;
int strict_trust;
} config_t;
void usage();
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;
int main(int argc, char *argv[])
{
char flag_spid = 0;
char flag_pubkey = 0;
char flag_cert = 0;
char flag_ca = 0;
char flag_usage = 0;
char flag_noproxy= 0;
char flag_prod= 0;
char flag_stdio= 0;
char *sigrl = NULL;
config_t config;
int oops;
IAS_Connection *ias= NULL;
MsgIO *msgio;
char *port= NULL;
/* Command line options */
static struct option long_opt[] =
{
{"ias-signing-cafile",
required_argument, 0, 'A'},
{"ca-bundle", required_argument, 0, 'B'},
{"ias-cert", required_argument, 0, 'C'},
{"ias-cert-passwd",
required_argument, 0, 'E'},
{"list-agents", no_argument, 0, 'G'},
{"service-key-file",
required_argument, 0, 'K'},
{"production", no_argument, 0, 'P'},
{"spid-file", required_argument, 0, 'S'},
{"strict-trust-mode",
no_argument, 0, 'X'},
{"ias-cert-key",
required_argument, 0, 'Y'},
{"debug", no_argument, 0, 'd'},
{"user-agent", required_argument, 0, 'g'},
{"help", no_argument, 0, 'h'},
{"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'},
{"ias-cert-type", required_argument, 0, 't'},
{"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));
#ifdef _WIN32
strncpy_s((char *)config.cert_type, 4, "PEM", 3);
#else
strncpy((char *)config.cert_type, "PEM", 3);
#endif
config.apiver= IAS_API_DEF_VERSION;
/* Parse our options */
while (1) {
int c;
int opt_index = 0;
c = getopt_long(argc, argv, "A:B:C:E:GK:PS:XY:dg:hk:lp:r:s:t: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 'C':
config.cert_file = strdup(optarg);
if (config.cert_file == NULL) {
perror("strdup");
return 1;
}
++flag_cert;
break;
case 'E':
config.cert_passwd_file = strdup(optarg);
if (config.cert_passwd_file == NULL) {
perror("strdup");
return 1;
}
break;
case 'G':
ias_list_agents(stdout);
return 1;
case 'P':
flag_prod = 1;
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 '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 'X':
config.strict_trust= 1;
break;
case 'Y':
config.cert_key_file = strdup(optarg);
if (config.cert_key_file == NULL) {
perror("strdup");
return 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 '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 't':
strncpy((char *) config.cert_type, optarg, 4);
if ( debug ) eprintf("+++ cert type set to %s\n",
config.cert_type);
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;
}
}
/* 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_cert) {
eprintf("--ias-cert-file is required\n");
flag_usage = 1;
}
if (!flag_ca) {
eprintf("--ias-signing-cafile is required\n");
flag_usage = 1;
}
if (flag_usage) usage();
if (verbose) eprintf("Using cert file %s\n", config.cert_file);
/* 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
);
}
catch (...) {
oops = 1;
eprintf("exception while creating IAS request object\n");
return 1;
}
ias->client_cert(config.cert_file, (char *)config.cert_type);
if ( config.cert_passwd_file != NULL ) {
char *passwd;
char *keyfile;
off_t sz;
if ( ! from_file(NULL, config.cert_passwd_file, &sz) ) {
eprintf("can't load password from %s\n",
config.cert_passwd_file);
return 1;
}
if ( sz > 0 ) {
char *cp;
try {
passwd= new char[sz+1];
}
catch (...) {
eprintf("out of memory\n");
return 1;
}
if ( ! from_file((unsigned char *) passwd, config.cert_passwd_file,
&sz) ) {
eprintf("can't load password from %s\n",
config.cert_passwd_file);
return 1;
}
passwd[sz]= 0;
// Remove trailing newline or linefeed.
cp= strchr(passwd, '\n');
if ( cp != NULL ) *cp= 0;
cp= strchr(passwd, '\r');
if ( cp != NULL ) *cp= 0;
// If a key file isn't specified, assume it's bundled with
// the certificate.
keyfile= (config.cert_key_file == NULL) ? config.cert_file :
config.cert_key_file;
if ( debug ) eprintf("+++ using cert key file %s\n", keyfile);
ias->client_key(keyfile, passwd);
#ifdef _WIN32
SecureZeroMemory(passwd, sz);
#else
// -fno-builtin-memset prevents optimizing this away
memset(passwd, 0, sz);
#endif
}
} else if ( config.cert_key_file != NULL ) {
// We have a key file but no password.
ias->client_key(config.cert_key_file, NULL);
}
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;
}
}
/* 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(&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");
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(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");
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");
return 0;
}
/* Encode the report body as base64 */
b64quote= base64_encode((char *) &msg3->quote, quote_sz);
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");
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");
return 0;
}
/*
* A real service provider would 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.
*/
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));
}
}
} else {
eprintf("Attestation failed\n");
return 0;
}
free(b64quote);
return 1;
}
/*
* Read and process message 0 and message 1. These messages are sent by
* the client concatenated together for efficiency (msg0||msg1).
*/
int process_msg01 (MsgIO *msgio, IAS_Connection *ias, sgx_ra_msg1_t *msg1,
sgx_ra_msg2_t *msg2, char **sigrl, config_t *config, ra_session_t *session)
{
struct msg01_struct {
uint32_t msg0_extended_epid_group_id;
sgx_ra_msg1_t msg1;
} *msg01;
size_t blen= 0;
char *buffer= NULL;
unsigned char digest[32], r[32], s[32], gb_ga[128];
EVP_PKEY *Gb;
int rv;
memset(msg2, 0, sizeof(sgx_ra_msg2_t));
/*
* 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 msg0||msg1\n");
rv= msgio->read((void **) &msg01, NULL);
if ( rv == -1 ) {
eprintf("system error reading msg0||msg1\n");
return 0;
} else if ( rv == 0 ) {
eprintf("protocol error reading msg0||msg1\n");
return 0;
}
if ( verbose ) {
edividerWithText("Msg0 Details (from Client)");
eprintf("msg0.extended_epid_group_id = %u\n",
msg01->msg0_extended_epid_group_id);
edivider();
}
/* According to the Intel SGX Developer Reference
* "Currently, the only valid extended Intel(R) EPID group ID is zero. The
* server should verify this value is zero. If the Intel(R) EPID group ID
* is not zero, the server aborts remote attestation"
*/
if ( msg01->msg0_extended_epid_group_id != 0 ) {
eprintf("msg0 Extended Epid Group ID is not zero. Exiting.\n");
free(msg01);
return 0;
}
// Pass msg1 back to the pointer in the caller func
memcpy(msg1, &msg01->msg1, sizeof(sgx_ra_msg1_t));
if ( verbose ) {
edividerWithText("Msg1 Details (from Client)");
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("msg1.gid = %s\n",
hexstring( &msg1->gid, sizeof(msg1->gid)));
edivider();
}
/* Generate our session key */
if ( debug ) eprintf("+++ generating session key Gb\n");
Gb= key_generate();
if ( Gb == NULL ) {
eprintf("Could not create a session key\n");
free(msg01);
return 0;
}
/*
* Derive the KDK from the key (Ga) in msg1 and our session key.
* An application would normally protect the KDK in memory to
* prevent trivial inspection.
*/
if ( debug ) eprintf("+++ deriving KDK\n");
if ( ! derive_kdk(Gb, session->kdk, msg1->g_a, config) ) {
eprintf("Could not derive the KDK\n");
free(msg01);
return 0;
}
if ( debug ) eprintf("+++ KDK = %s\n", hexstring(session->kdk, 16));
/*
* Derive the SMK from the KDK
* SMK = AES_CMAC(KDK, 0x01 || "SMK" || 0x00 || 0x80 || 0x00)
*/
if ( debug ) eprintf("+++ deriving SMK\n");
cmac128(session->kdk, (unsigned char *)("\x01SMK\x00\x80\x00"), 7,
session->smk);
if ( debug ) eprintf("+++ SMK = %s\n", hexstring(session->smk, 16));
/*
* Build message 2
*
* A || CMACsmk(A) || SigRL
* (148 + 16 + SigRL_length bytes = 164 + SigRL_length bytes)
*
* where:
*