зеркало из https://github.com/mozilla/gecko-dev.git
296 строки
11 KiB
C++
296 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_BasePrincipal_h
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#define mozilla_BasePrincipal_h
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#include "nsJSPrincipals.h"
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#include "mozilla/Attributes.h"
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#include "mozilla/OriginAttributes.h"
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class nsAtom;
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class nsIContentSecurityPolicy;
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class nsIObjectOutputStream;
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class nsIObjectInputStream;
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class nsIURI;
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class ExpandedPrincipal;
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namespace mozilla {
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namespace extensions {
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class WebExtensionPolicy;
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}
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/*
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* Base class from which all nsIPrincipal implementations inherit. Use this for
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* default implementations and other commonalities between principal
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* implementations.
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*
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* We should merge nsJSPrincipals into this class at some point.
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*/
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class BasePrincipal : public nsJSPrincipals
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{
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public:
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enum PrincipalKind {
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eNullPrincipal,
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eCodebasePrincipal,
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eExpandedPrincipal,
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eSystemPrincipal
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};
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explicit BasePrincipal(PrincipalKind aKind);
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template<typename T>
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bool Is() const
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{
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return mKind == T::Kind();
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}
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template<typename T>
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T* As()
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{
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MOZ_ASSERT(Is<T>());
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return static_cast<T*>(this);
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}
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enum DocumentDomainConsideration { DontConsiderDocumentDomain, ConsiderDocumentDomain};
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bool Subsumes(nsIPrincipal* aOther, DocumentDomainConsideration aConsideration);
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NS_IMETHOD GetOrigin(nsACString& aOrigin) final;
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NS_IMETHOD GetOriginNoSuffix(nsACString& aOrigin) final;
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NS_IMETHOD Equals(nsIPrincipal* other, bool* _retval) final;
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NS_IMETHOD EqualsConsideringDomain(nsIPrincipal* other, bool* _retval) final;
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NS_IMETHOD Subsumes(nsIPrincipal* other, bool* _retval) final;
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NS_IMETHOD SubsumesConsideringDomain(nsIPrincipal* other, bool* _retval) final;
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NS_IMETHOD SubsumesConsideringDomainIgnoringFPD(nsIPrincipal* other, bool* _retval) final;
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NS_IMETHOD CheckMayLoad(nsIURI* uri, bool report, bool allowIfInheritsPrincipal) final;
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NS_IMETHOD GetAddonPolicy(nsISupports** aResult) final;
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NS_IMETHOD GetCsp(nsIContentSecurityPolicy** aCsp) override;
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NS_IMETHOD SetCsp(nsIContentSecurityPolicy* aCsp) override;
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NS_IMETHOD EnsureCSP(nsIDocument* aDocument, nsIContentSecurityPolicy** aCSP) override;
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NS_IMETHOD GetPreloadCsp(nsIContentSecurityPolicy** aPreloadCSP) override;
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NS_IMETHOD EnsurePreloadCSP(nsIDocument* aDocument, nsIContentSecurityPolicy** aCSP) override;
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NS_IMETHOD GetCspJSON(nsAString& outCSPinJSON) override;
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NS_IMETHOD GetIsNullPrincipal(bool* aResult) override;
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NS_IMETHOD GetIsCodebasePrincipal(bool* aResult) override;
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NS_IMETHOD GetIsExpandedPrincipal(bool* aResult) override;
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NS_IMETHOD GetIsSystemPrincipal(bool* aResult) override;
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NS_IMETHOD GetIsAddonOrExpandedAddonPrincipal(bool* aResult) override;
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NS_IMETHOD GetOriginAttributes(JSContext* aCx, JS::MutableHandle<JS::Value> aVal) final;
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NS_IMETHOD GetOriginSuffix(nsACString& aOriginSuffix) final;
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NS_IMETHOD GetAppId(uint32_t* aAppId) final;
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NS_IMETHOD GetIsInIsolatedMozBrowserElement(bool* aIsInIsolatedMozBrowserElement) final;
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NS_IMETHOD GetUserContextId(uint32_t* aUserContextId) final;
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NS_IMETHOD GetPrivateBrowsingId(uint32_t* aPrivateBrowsingId) final;
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virtual bool AddonHasPermission(const nsAtom* aPerm);
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virtual bool IsCodebasePrincipal() const { return false; };
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static BasePrincipal* Cast(nsIPrincipal* aPrin) { return static_cast<BasePrincipal*>(aPrin); }
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static already_AddRefed<BasePrincipal>
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CreateCodebasePrincipal(const nsACString& aOrigin);
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// These following method may not create a codebase principal in case it's
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// not possible to generate a correct origin from the passed URI. If this
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// happens, a NullPrincipal is returned.
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static already_AddRefed<BasePrincipal>
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CreateCodebasePrincipal(nsIURI* aURI, const OriginAttributes& aAttrs);
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const OriginAttributes& OriginAttributesRef() final { return mOriginAttributes; }
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uint32_t AppId() const { return mOriginAttributes.mAppId; }
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extensions::WebExtensionPolicy* AddonPolicy();
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uint32_t UserContextId() const { return mOriginAttributes.mUserContextId; }
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uint32_t PrivateBrowsingId() const { return mOriginAttributes.mPrivateBrowsingId; }
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bool IsInIsolatedMozBrowserElement() const { return mOriginAttributes.mInIsolatedMozBrowser; }
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PrincipalKind Kind() const { return mKind; }
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already_AddRefed<BasePrincipal> CloneStrippingUserContextIdAndFirstPartyDomain();
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// If this is an add-on content script principal, returns its AddonPolicy.
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// Otherwise returns null.
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extensions::WebExtensionPolicy* ContentScriptAddonPolicy();
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// Helper to check whether this principal is associated with an addon that
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// allows unprivileged code to load aURI. aExplicit == true will prevent
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// use of all_urls permission, requiring the domain in its permissions.
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bool AddonAllowsLoad(nsIURI* aURI, bool aExplicit = false);
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// Call these to avoid the cost of virtual dispatch.
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inline bool FastEquals(nsIPrincipal* aOther);
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inline bool FastEqualsConsideringDomain(nsIPrincipal* aOther);
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inline bool FastSubsumes(nsIPrincipal* aOther);
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inline bool FastSubsumesConsideringDomain(nsIPrincipal* aOther);
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inline bool FastSubsumesConsideringDomainIgnoringFPD(nsIPrincipal* aOther);
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// Returns the principal to inherit when a caller with this principal loads
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// the given URI.
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//
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// For most principal types, this returns the principal itself. For expanded
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// principals, it returns the first sub-principal which subsumes the given URI
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// (or, if no URI is given, the last whitelist principal).
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nsIPrincipal* PrincipalToInherit(nsIURI* aRequestedURI = nullptr);
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/**
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* Returns true if this principal's CSP should override a document's CSP for
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* loads that it triggers. Currently true for system principal, for expanded
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* principals which subsume the document principal, and add-on codebase
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* principals regardless of whether they subsume the document principal.
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*/
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bool OverridesCSP(nsIPrincipal* aDocumentPrincipal)
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{
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// SystemPrincipal can override the page's CSP by definition.
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if (mKind == eSystemPrincipal) {
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return true;
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}
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// Expanded principals override CSP if and only if they subsume the document
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// principal.
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if (mKind == eExpandedPrincipal) {
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return FastSubsumes(aDocumentPrincipal);
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}
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// Extension principals always override the CSP non-extension principals.
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// This is primarily for the sake of their stylesheets, which are usually
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// loaded from channels and cannot have expanded principals.
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return (AddonPolicy() &&
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!BasePrincipal::Cast(aDocumentPrincipal)->AddonPolicy());
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}
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protected:
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virtual ~BasePrincipal();
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// Note that this does not check OriginAttributes. Callers that depend on
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// those must call Subsumes instead.
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virtual bool SubsumesInternal(nsIPrincipal* aOther, DocumentDomainConsideration aConsider) = 0;
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// Internal, side-effect-free check to determine whether the concrete
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// principal would allow the load ignoring any common behavior implemented in
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// BasePrincipal::CheckMayLoad.
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virtual bool MayLoadInternal(nsIURI* aURI) = 0;
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friend class ::ExpandedPrincipal;
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void
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SetHasExplicitDomain()
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{
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mHasExplicitDomain = true;
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}
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// This function should be called as the last step of the initialization of the
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// principal objects. It's typically called as the last step from the Init()
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// method of the child classes.
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void FinishInit(const nsACString& aOriginNoSuffix,
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const OriginAttributes& aOriginAttributes);
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nsCOMPtr<nsIContentSecurityPolicy> mCSP;
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nsCOMPtr<nsIContentSecurityPolicy> mPreloadCSP;
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private:
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static already_AddRefed<BasePrincipal>
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CreateCodebasePrincipal(nsIURI* aURI, const OriginAttributes& aAttrs,
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const nsACString& aOriginNoSuffix);
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RefPtr<nsAtom> mOriginNoSuffix;
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RefPtr<nsAtom> mOriginSuffix;
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OriginAttributes mOriginAttributes;
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PrincipalKind mKind;
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bool mHasExplicitDomain;
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bool mInitialized;
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};
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inline bool
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BasePrincipal::FastEquals(nsIPrincipal* aOther)
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{
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auto other = Cast(aOther);
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if (Kind() != other->Kind()) {
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// Principals of different kinds can't be equal.
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return false;
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}
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// Two principals are considered to be equal if their origins are the same.
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// If the two principals are codebase principals, their origin attributes
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// (aka the origin suffix) must also match.
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// If the two principals are null principals, they're only equal if they're
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// the same object.
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if (Kind() == eNullPrincipal || Kind() == eSystemPrincipal) {
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return this == other;
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}
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if (Kind() == eCodebasePrincipal) {
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return mOriginNoSuffix == other->mOriginNoSuffix &&
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mOriginSuffix == other->mOriginSuffix;
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}
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MOZ_ASSERT(Kind() == eExpandedPrincipal);
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return mOriginNoSuffix == other->mOriginNoSuffix;
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}
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inline bool
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BasePrincipal::FastEqualsConsideringDomain(nsIPrincipal* aOther)
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{
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// If neither of the principals have document.domain set, we use the fast path
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// in Equals(). Otherwise, we fall back to the slow path below.
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auto other = Cast(aOther);
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if (!mHasExplicitDomain && !other->mHasExplicitDomain) {
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return FastEquals(aOther);
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}
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return Subsumes(aOther, ConsiderDocumentDomain) &&
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other->Subsumes(this, ConsiderDocumentDomain);
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}
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inline bool
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BasePrincipal::FastSubsumes(nsIPrincipal* aOther)
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{
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// If two principals are equal, then they both subsume each other.
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// We deal with two special cases first:
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// Null principals only subsume each other if they are equal, and are only
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// equal if they're the same object.
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auto other = Cast(aOther);
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if (Kind() == eNullPrincipal && other->Kind() == eNullPrincipal) {
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return this == other;
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}
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if (FastEquals(aOther)) {
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return true;
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}
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// Otherwise, fall back to the slow path.
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return Subsumes(aOther, DontConsiderDocumentDomain);
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}
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inline bool
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BasePrincipal::FastSubsumesConsideringDomain(nsIPrincipal* aOther)
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{
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// If neither of the principals have document.domain set, we hand off to
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// FastSubsumes() which has fast paths for some special cases. Otherwise, we fall
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// back to the slow path below.
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if (!mHasExplicitDomain && !Cast(aOther)->mHasExplicitDomain) {
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return FastSubsumes(aOther);
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}
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return Subsumes(aOther, ConsiderDocumentDomain);
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}
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inline bool
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BasePrincipal::FastSubsumesConsideringDomainIgnoringFPD(nsIPrincipal* aOther)
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{
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if (Kind() == eCodebasePrincipal &&
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!dom::ChromeUtils::IsOriginAttributesEqualIgnoringFPD(
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mOriginAttributes, Cast(aOther)->mOriginAttributes)) {
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return false;
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}
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return SubsumesInternal(aOther, ConsiderDocumentDomain);
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}
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} // namespace mozilla
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#endif /* mozilla_BasePrincipal_h */
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