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//
// MCCertificateUtils.cc
// mailcore2
//
// Created by DINH Viêt Hoà on 7/25/13.
// Copyright (c) 2013 MailCore. All rights reserved.
//
#include "MCCertificateUtils.h"
#if __APPLE__
#include <CoreFoundation/CoreFoundation.h>
#include <Security/Security.h>
#else
#include <openssl/bio.h>
#include <openssl/x509.h>
#include <openssl/x509_vfy.h>
#include <openssl/pem.h>
#include <openssl/err.h>
#endif
#include "MCLog.h"
bool mailcore::checkCertificate(mailstream * stream, String * hostname)
{
#if __APPLE__
bool result = false;
CFStringRef hostnameCFString;
SecPolicyRef policy;
CFMutableArrayRef certificates;
SecTrustRef trust = NULL;
SecTrustResultType trustResult;
OSStatus status;
carray * cCerts = mailstream_get_certificate_chain(stream);
if (cCerts == NULL) {
fprintf(stderr, "warning: No certificate chain retrieved");
goto err;
}
hostnameCFString = CFStringCreateWithCharacters(NULL, (const UniChar *) hostname->unicodeCharacters(),
hostname->length());
policy = SecPolicyCreateSSL(true, hostnameCFString);
certificates = CFArrayCreateMutable(NULL, 0, &kCFTypeArrayCallBacks);
for(unsigned int i = 0 ; i < carray_count(cCerts) ; i ++) {
MMAPString * str;
str = (MMAPString *) carray_get(cCerts, i);
CFDataRef data = CFDataCreate(NULL, (const UInt8 *) str->str, (CFIndex) str->len);
SecCertificateRef cert = SecCertificateCreateWithData(NULL, data);
CFArrayAppendValue(certificates, cert);
CFRelease(data);
CFRelease(cert);
}
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
// The below API calls are not thread safe. We're making sure not to call the concurrently.
pthread_mutex_lock(&lock);
status = SecTrustCreateWithCertificates(certificates, policy, &trust);
if (status != noErr) {
pthread_mutex_unlock(&lock);
goto free_certs;
}
status = SecTrustEvaluate(trust, &trustResult);
if (status != noErr) {
pthread_mutex_unlock(&lock);
goto free_certs;
}
pthread_mutex_unlock(&lock);
switch (trustResult) {
case kSecTrustResultUnspecified:
case kSecTrustResultProceed:
// certificate chain is ok
result = true;
break;
default:
// certificate chain is invalid
break;
}
CFRelease(trust);
free_certs:
CFRelease(certificates);
mailstream_certificate_chain_free(cCerts);
CFRelease(policy);
CFRelease(hostnameCFString);
err:
return result;
#else
bool result = false;
X509_STORE * store = NULL;
X509_STORE_CTX * storectx = NULL;
STACK_OF(X509) * certificates = NULL;
int status;
carray * cCerts = mailstream_get_certificate_chain(stream);
if (cCerts == NULL) {
fprintf(stderr, "warning: No certificate chain retrieved");
goto err;
}
store = X509_STORE_new();
if (store == NULL) {
goto free_certs;
}
#ifdef _MSC_VER
HCERTSTORE systemStore = CertOpenSystemStore(NULL, L"ROOT");
PCCERT_CONTEXT previousCert = NULL;
while (1) {
PCCERT_CONTEXT nextCert = CertEnumCertificatesInStore(systemStore, previousCert);
if (nextCert == NULL) {
break;
}
X509 * openSSLCert = d2i_X509(NULL, (const unsigned char **)&nextCert->pbCertEncoded, nextCert->cbCertEncoded);
if (openSSLCert != NULL) {
X509_STORE_add_cert(store, openSSLCert);
X509_free(openSSLCert);
}
previousCert = nextCert;
}
CertCloseStore(systemStore, 0);
#endif
status = X509_STORE_set_default_paths(store);
if (status != 1) {
printf("Error loading the system-wide CA certificates");
}
certificates = sk_X509_new_null();
for(unsigned int i = 0 ; i < carray_count(cCerts) ; i ++) {
MMAPString * str;
str = (MMAPString *) carray_get(cCerts, i);
if (str == NULL) {
goto free_certs;
}
BIO *bio = BIO_new_mem_buf((void *) str->str, str->len);
X509 *certificate = d2i_X509_bio(bio, NULL);
BIO_free(bio);
if (!sk_X509_push(certificates, certificate)) {
goto free_certs;
}
}
storectx = X509_STORE_CTX_new();
if (storectx == NULL) {
goto free_certs;
}
status = X509_STORE_CTX_init(storectx, store, sk_X509_value(certificates, 0), certificates);
if (status != 1) {
goto free_certs;
}
status = X509_verify_cert(storectx);
if (status == 1) {
result = true;
}
free_certs:
mailstream_certificate_chain_free(cCerts);
if (certificates != NULL) {
sk_X509_pop_free((STACK_OF(X509) *) certificates, X509_free);
}
if (storectx != NULL) {
X509_STORE_CTX_free(storectx);
}
if (store != NULL) {
X509_STORE_free(store);
}
err:
return result;
#endif
}
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