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// Copyright (c) 2010 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.
#include "chrome/browser/ssl/ssl_policy.h"
#include "base/base_switches.h"
#include "base/command_line.h"
#include "base/singleton.h"
#include "base/string_piece.h"
#include "base/string_util.h"
#include "chrome/browser/ssl/ssl_cert_error_handler.h"
#include "chrome/browser/ssl/ssl_error_info.h"
#include "chrome/browser/ssl/ssl_request_info.h"
#include "chrome/common/jstemplate_builder.h"
#include "chrome/common/time_format.h"
#include "chrome/common/url_constants.h"
#include "content/browser/renderer_host/render_process_host.h"
#include "content/browser/renderer_host/render_view_host.h"
#include "content/browser/site_instance.h"
#include "content/browser/tab_contents/navigation_entry.h"
#include "content/browser/tab_contents/tab_contents.h"
#include "grit/generated_resources.h"
#include "net/base/cert_status_flags.h"
#include "net/base/ssl_info.h"
#include "webkit/glue/resource_type.h"
namespace {
static const char kDot = '.';
static bool IsIntranetHost(const std::string& host) {
const size_t dot = host.find(kDot);
return dot == std::string::npos || dot == host.length() - 1;
}
} // namespace
SSLPolicy::SSLPolicy(SSLPolicyBackend* backend)
: backend_(backend) {
DCHECK(backend_);
}
void SSLPolicy::OnCertError(SSLCertErrorHandler* handler) {
// First we check if we know the policy for this error.
net::CertPolicy::Judgment judgment =
backend_->QueryPolicy(handler->ssl_info().cert,
handler->request_url().host());
if (judgment == net::CertPolicy::ALLOWED) {
handler->ContinueRequest();
return;
}
// The judgment is either DENIED or UNKNOWN.
// For now we handle the DENIED as the UNKNOWN, which means a blocking
// page is shown to the user every time he comes back to the page.
switch (handler->cert_error()) {
case net::ERR_CERT_COMMON_NAME_INVALID:
case net::ERR_CERT_DATE_INVALID:
case net::ERR_CERT_AUTHORITY_INVALID:
case net::ERR_CERT_WEAK_SIGNATURE_ALGORITHM:
OnCertErrorInternal(handler, SSLBlockingPage::ERROR_OVERRIDABLE);
break;
case net::ERR_CERT_NO_REVOCATION_MECHANISM:
// Ignore this error.
handler->ContinueRequest();
break;
case net::ERR_CERT_UNABLE_TO_CHECK_REVOCATION:
// We ignore this error but will show a warning status in the location
// bar.
handler->ContinueRequest();
break;
case net::ERR_CERT_CONTAINS_ERRORS:
case net::ERR_CERT_REVOKED:
case net::ERR_CERT_INVALID:
case net::ERR_CERT_NOT_IN_DNS:
OnCertErrorInternal(handler, SSLBlockingPage::ERROR_FATAL);
break;
default:
NOTREACHED();
handler->CancelRequest();
break;
}
}
void SSLPolicy::DidRunInsecureContent(NavigationEntry* entry,
const std::string& security_origin) {
if (!entry)
return;
SiteInstance* site_instance = entry->site_instance();
if (!site_instance)
return;
backend_->HostRanInsecureContent(GURL(security_origin).host(),
site_instance->GetProcess()->id());
}
void SSLPolicy::OnRequestStarted(SSLRequestInfo* info) {
// TODO(abarth): This mechanism is wrong. What we should be doing is sending
// this information back through WebKit and out some FrameLoaderClient
// methods.
if (net::IsCertStatusError(info->ssl_cert_status()))
backend_->HostRanInsecureContent(info->url().host(), info->child_id());
}
void SSLPolicy::UpdateEntry(NavigationEntry* entry, TabContents* tab_contents) {
DCHECK(entry);
InitializeEntryIfNeeded(entry);
if (!entry->url().SchemeIsSecure())
return;
// An HTTPS response may not have a certificate for some reason. When that
// happens, use the unauthenticated (HTTP) rather than the authentication
// broken security style so that we can detect this error condition.
if (!entry->ssl().cert_id()) {
entry->ssl().set_security_style(SECURITY_STYLE_UNAUTHENTICATED);
return;
}
if (!(entry->ssl().cert_status() & net::CERT_STATUS_COMMON_NAME_INVALID)) {
// CAs issue certificates for intranet hosts to everyone. Therefore, we
// mark intranet hosts as being non-unique.
if (IsIntranetHost(entry->url().host())) {
entry->ssl().set_cert_status(entry->ssl().cert_status() |
net::CERT_STATUS_NON_UNIQUE_NAME);
}
}
// If CERT_STATUS_UNABLE_TO_CHECK_REVOCATION is the only certificate error,
// don't lower the security style to SECURITY_STYLE_AUTHENTICATION_BROKEN.
int cert_errors = entry->ssl().cert_status() & net::CERT_STATUS_ALL_ERRORS;
if (cert_errors) {
if (cert_errors != net::CERT_STATUS_UNABLE_TO_CHECK_REVOCATION)
entry->ssl().set_security_style(SECURITY_STYLE_AUTHENTICATION_BROKEN);
return;
}
SiteInstance* site_instance = entry->site_instance();
// Note that |site_instance| can be NULL here because NavigationEntries don't
// necessarily have site instances. Without a process, the entry can't
// possibly have insecure content. See bug http://crbug.com/12423.
if (site_instance &&
backend_->DidHostRunInsecureContent(entry->url().host(),
site_instance->GetProcess()->id())) {
entry->ssl().set_security_style(SECURITY_STYLE_AUTHENTICATION_BROKEN);
entry->ssl().set_ran_insecure_content();
return;
}
if (tab_contents->displayed_insecure_content())
entry->ssl().set_displayed_insecure_content();
}
////////////////////////////////////////////////////////////////////////////////
// SSLBlockingPage::Delegate methods
SSLErrorInfo SSLPolicy::GetSSLErrorInfo(SSLCertErrorHandler* handler) {
return SSLErrorInfo::CreateError(
SSLErrorInfo::NetErrorToErrorType(handler->cert_error()),
handler->ssl_info().cert, handler->request_url());
}
void SSLPolicy::OnDenyCertificate(SSLCertErrorHandler* handler) {
// Default behavior for rejecting a certificate.
//
// While DenyCertForHost() executes synchronously on this thread,
// CancelRequest() gets posted to a different thread. Calling
// DenyCertForHost() first ensures deterministic ordering.
backend_->DenyCertForHost(handler->ssl_info().cert,
handler->request_url().host());
handler->CancelRequest();
}
void SSLPolicy::OnAllowCertificate(SSLCertErrorHandler* handler) {
// Default behavior for accepting a certificate.
// Note that we should not call SetMaxSecurityStyle here, because the active
// NavigationEntry has just been deleted (in HideInterstitialPage) and the
// new NavigationEntry will not be set until DidNavigate. This is ok,
// because the new NavigationEntry will have its max security style set
// within DidNavigate.
//
// While AllowCertForHost() executes synchronously on this thread,
// ContinueRequest() gets posted to a different thread. Calling
// AllowCertForHost() first ensures deterministic ordering.
backend_->AllowCertForHost(handler->ssl_info().cert,
handler->request_url().host());
handler->ContinueRequest();
}
////////////////////////////////////////////////////////////////////////////////
// Certificate Error Routines
void SSLPolicy::OnCertErrorInternal(SSLCertErrorHandler* handler,
SSLBlockingPage::ErrorLevel error_level) {
if (handler->resource_type() != ResourceType::MAIN_FRAME) {
// A sub-resource has a certificate error. The user doesn't really
// have a context for making the right decision, so block the
// request hard, without an info bar to allow showing the insecure
// content.
handler->DenyRequest();
return;
}
SSLBlockingPage* blocking_page = new SSLBlockingPage(handler, this,
error_level);
blocking_page->Show();
}
void SSLPolicy::InitializeEntryIfNeeded(NavigationEntry* entry) {
if (entry->ssl().security_style() != SECURITY_STYLE_UNKNOWN)
return;
entry->ssl().set_security_style(entry->url().SchemeIsSecure() ?
SECURITY_STYLE_AUTHENTICATED : SECURITY_STYLE_UNAUTHENTICATED);
}
void SSLPolicy::OriginRanInsecureContent(const std::string& origin, int pid) {
GURL parsed_origin(origin);
if (parsed_origin.SchemeIsSecure())
backend_->HostRanInsecureContent(parsed_origin.host(), pid);
}
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