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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#import "ios/web/web_state/wk_web_view_security_util.h"
#include "base/mac/scoped_cftyperef.h"
#include "base/strings/sys_string_conversions.h"
#include "net/cert/x509_certificate.h"
#include "net/ssl/ssl_info.h"
namespace web {
// This key was determined by inspecting userInfo dict of an SSL error.
NSString* const kNSErrorPeerCertificateChainKey =
@"NSErrorPeerCertificateChainKey";
}
namespace {
// Maps NSError code to net::CertStatus.
net::CertStatus GetCertStatusFromNSErrorCode(NSInteger code) {
switch (code) {
// Regardless of real certificate problem the system always returns
// NSURLErrorServerCertificateUntrusted. The mapping is done in case this
// bug is fixed (rdar://18517043).
case NSURLErrorServerCertificateUntrusted:
case NSURLErrorSecureConnectionFailed:
case NSURLErrorServerCertificateHasUnknownRoot:
case NSURLErrorClientCertificateRejected:
case NSURLErrorClientCertificateRequired:
return net::CERT_STATUS_INVALID;
case NSURLErrorServerCertificateHasBadDate:
case NSURLErrorServerCertificateNotYetValid:
return net::CERT_STATUS_DATE_INVALID;
}
NOTREACHED();
return 0;
}
} // namespace
namespace web {
scoped_refptr<net::X509Certificate> CreateCertFromChain(NSArray* certs) {
if (certs.count == 0)
return nullptr;
net::X509Certificate::OSCertHandles intermediates;
for (NSUInteger i = 1; i < certs.count; i++) {
intermediates.push_back(reinterpret_cast<SecCertificateRef>(certs[i]));
}
return net::X509Certificate::CreateFromHandle(
reinterpret_cast<SecCertificateRef>(certs[0]), intermediates);
}
scoped_refptr<net::X509Certificate> CreateCertFromTrust(SecTrustRef trust) {
if (!trust)
return nullptr;
CFIndex cert_count = SecTrustGetCertificateCount(trust);
if (cert_count == 0) {
// At the moment there is no API which allows trust creation w/o certs.
return nullptr;
}
net::X509Certificate::OSCertHandles intermediates;
for (CFIndex i = 1; i < cert_count; i++) {
intermediates.push_back(SecTrustGetCertificateAtIndex(trust, i));
}
return net::X509Certificate::CreateFromHandle(
SecTrustGetCertificateAtIndex(trust, 0), intermediates);
}
base::ScopedCFTypeRef<SecTrustRef> CreateServerTrustFromChain(NSArray* certs,
NSString* host) {
base::ScopedCFTypeRef<SecTrustRef> scoped_result;
if (certs.count == 0)
return scoped_result;
base::ScopedCFTypeRef<SecPolicyRef> policy(
SecPolicyCreateSSL(TRUE, static_cast<CFStringRef>(host)));
SecTrustRef ref_result = nullptr;
if (SecTrustCreateWithCertificates(certs, policy, &ref_result) ==
errSecSuccess) {
scoped_result.reset(ref_result);
}
return scoped_result;
}
void EnsureFutureTrustEvaluationSucceeds(SecTrustRef trust) {
base::ScopedCFTypeRef<CFDataRef> exceptions(SecTrustCopyExceptions(trust));
SecTrustSetExceptions(trust, exceptions);
}
BOOL IsWKWebViewSSLCertError(NSError* error) {
if (![error.domain isEqualToString:NSURLErrorDomain]) {
return NO;
}
switch (error.code) {
case NSURLErrorServerCertificateHasBadDate:
case NSURLErrorServerCertificateUntrusted:
case NSURLErrorServerCertificateHasUnknownRoot:
case NSURLErrorServerCertificateNotYetValid:
return YES;
case NSURLErrorSecureConnectionFailed:
// Although the finer-grained errors above exist, iOS never uses them
// and instead signals NSURLErrorSecureConnectionFailed for both
// certificate failures and other SSL connection failures. Instead, check
// if the error has a certificate attached (crbug.com/539735).
return [error.userInfo[web::kNSErrorPeerCertificateChainKey] count] > 0;
default:
return NO;
}
}
void GetSSLInfoFromWKWebViewSSLCertError(NSError* error,
net::SSLInfo* ssl_info) {
DCHECK(IsWKWebViewSSLCertError(error));
ssl_info->cert_status = GetCertStatusFromNSErrorCode(error.code);
ssl_info->cert = web::CreateCertFromChain(
error.userInfo[web::kNSErrorPeerCertificateChainKey]);
}
SecurityStyle GetSecurityStyleFromTrustResult(SecTrustResultType result) {
switch (result) {
case kSecTrustResultInvalid:
return SECURITY_STYLE_UNKNOWN;
case kSecTrustResultProceed:
case kSecTrustResultUnspecified:
return SECURITY_STYLE_AUTHENTICATED;
case kSecTrustResultDeny:
case kSecTrustResultRecoverableTrustFailure:
case kSecTrustResultFatalTrustFailure:
case kSecTrustResultOtherError:
return SECURITY_STYLE_AUTHENTICATION_BROKEN;
}
NOTREACHED();
return SECURITY_STYLE_UNKNOWN;
}
} // namespace web
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