| // Copyright 2013 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 "extensions/common/manifest_handlers/csp_info.h" |
| |
| #include <memory> |
| |
| #include "base/strings/string_util.h" |
| #include "base/strings/utf_string_conversions.h" |
| #include "base/values.h" |
| #include "extensions/common/csp_validator.h" |
| #include "extensions/common/install_warning.h" |
| #include "extensions/common/manifest_constants.h" |
| #include "extensions/common/manifest_handlers/sandboxed_page_info.h" |
| |
| namespace extensions { |
| |
| namespace keys = manifest_keys; |
| namespace errors = manifest_errors; |
| |
| using csp_validator::ContentSecurityPolicyIsLegal; |
| using csp_validator::SanitizeContentSecurityPolicy; |
| |
| namespace { |
| |
| const char kDefaultContentSecurityPolicy[] = |
| "script-src 'self' blob: filesystem: chrome-extension-resource:; " |
| "object-src 'self' blob: filesystem:;"; |
| |
| #define PLATFORM_APP_LOCAL_CSP_SOURCES \ |
| "'self' blob: filesystem: data: chrome-extension-resource:" |
| |
| const char kDefaultPlatformAppContentSecurityPolicy[] = |
| // Platform apps can only use local resources by default. |
| "default-src 'self' blob: filesystem: chrome-extension-resource:;" |
| // For remote resources, they can fetch them via XMLHttpRequest. |
| " connect-src * data: blob: filesystem:;" |
| // And serve them via data: or same-origin (blob:, filesystem:) URLs |
| " style-src " PLATFORM_APP_LOCAL_CSP_SOURCES " 'unsafe-inline';" |
| " img-src " PLATFORM_APP_LOCAL_CSP_SOURCES ";" |
| " frame-src " PLATFORM_APP_LOCAL_CSP_SOURCES ";" |
| " font-src " PLATFORM_APP_LOCAL_CSP_SOURCES ";" |
| // Media can be loaded from remote resources since: |
| // 1. <video> and <audio> have good fallback behavior when offline or under |
| // spotty connectivity. |
| // 2. Fetching via XHR and serving via blob: URLs currently does not allow |
| // streaming or partial buffering. |
| " media-src * data: blob: filesystem:;"; |
| |
| int GetValidatorOptions(Extension* extension) { |
| int options = csp_validator::OPTIONS_NONE; |
| |
| // crbug.com/146487 |
| if (extension->GetType() == Manifest::TYPE_EXTENSION || |
| extension->GetType() == Manifest::TYPE_LEGACY_PACKAGED_APP) { |
| options |= csp_validator::OPTIONS_ALLOW_UNSAFE_EVAL; |
| } |
| |
| // Component extensions can specify an insecure object-src directive. This |
| // should be safe because non-NPAPI plugins should load in a sandboxed process |
| // and only allow communication via postMessage. Flash is an exception since |
| // it allows scripting into the embedder page, but even then it should |
| // disallow cross-origin scripting. At some point we may want to consider |
| // allowing this publicly. |
| if (extensions::Manifest::IsComponentLocation(extension->location())) |
| options |= csp_validator::OPTIONS_ALLOW_INSECURE_OBJECT_SRC; |
| |
| return options; |
| } |
| |
| } // namespace |
| |
| CSPInfo::CSPInfo(const std::string& security_policy) |
| : content_security_policy(security_policy) { |
| } |
| |
| CSPInfo::~CSPInfo() { |
| } |
| |
| // static |
| const std::string& CSPInfo::GetContentSecurityPolicy( |
| const Extension* extension) { |
| CSPInfo* csp_info = static_cast<CSPInfo*>( |
| extension->GetManifestData(keys::kContentSecurityPolicy)); |
| return csp_info ? csp_info->content_security_policy : base::EmptyString(); |
| } |
| |
| // static |
| const std::string& CSPInfo::GetResourceContentSecurityPolicy( |
| const Extension* extension, |
| const std::string& relative_path) { |
| return SandboxedPageInfo::IsSandboxedPage(extension, relative_path) ? |
| SandboxedPageInfo::GetContentSecurityPolicy(extension) : |
| GetContentSecurityPolicy(extension); |
| } |
| |
| CSPHandler::CSPHandler(bool is_platform_app) |
| : is_platform_app_(is_platform_app) { |
| } |
| |
| CSPHandler::~CSPHandler() { |
| } |
| |
| bool CSPHandler::Parse(Extension* extension, base::string16* error) { |
| const std::string key = Keys()[0]; |
| if (!extension->manifest()->HasPath(key)) { |
| if (extension->manifest_version() >= 2) { |
| // TODO(abarth): Should we continue to let extensions override the |
| // default Content-Security-Policy? |
| std::string content_security_policy = is_platform_app_ ? |
| kDefaultPlatformAppContentSecurityPolicy : |
| kDefaultContentSecurityPolicy; |
| |
| CHECK_EQ(content_security_policy, |
| SanitizeContentSecurityPolicy(content_security_policy, |
| GetValidatorOptions(extension), |
| NULL)); |
| extension->SetManifestData(keys::kContentSecurityPolicy, |
| new CSPInfo(content_security_policy)); |
| } |
| return true; |
| } |
| |
| std::string content_security_policy; |
| if (!extension->manifest()->GetString(key, &content_security_policy)) { |
| *error = base::ASCIIToUTF16(errors::kInvalidContentSecurityPolicy); |
| return false; |
| } |
| if (!ContentSecurityPolicyIsLegal(content_security_policy)) { |
| *error = base::ASCIIToUTF16(errors::kInvalidContentSecurityPolicy); |
| return false; |
| } |
| std::string sanitized_csp; |
| if (extension->manifest_version() >= 2) { |
| std::vector<InstallWarning> warnings; |
| content_security_policy = |
| SanitizeContentSecurityPolicy(content_security_policy, |
| GetValidatorOptions(extension), |
| &warnings); |
| extension->AddInstallWarnings(warnings); |
| } |
| |
| extension->SetManifestData(keys::kContentSecurityPolicy, |
| new CSPInfo(content_security_policy)); |
| return true; |
| } |
| |
| bool CSPHandler::AlwaysParseForType(Manifest::Type type) const { |
| if (is_platform_app_) |
| return type == Manifest::TYPE_PLATFORM_APP; |
| else |
| return type == Manifest::TYPE_EXTENSION || |
| type == Manifest::TYPE_LEGACY_PACKAGED_APP; |
| } |
| |
| const std::vector<std::string> CSPHandler::Keys() const { |
| const std::string& key = is_platform_app_ ? |
| keys::kPlatformAppContentSecurityPolicy : keys::kContentSecurityPolicy; |
| return SingleKey(key); |
| } |
| |
| } // namespace extensions |