caps/SystemPrincipal.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /* The privileged system principal. */
   7
   8 #include "nscore.h"
   9 #include "SystemPrincipal.h"
  10 #include "nsIComponentManager.h"
  11 #include "nsIServiceManager.h"
  12 #include "nsIURL.h"
  13 #include "nsCOMPtr.h"
  14 #include "nsReadableUtils.h"
  15 #include "nsCRT.h"
  16 #include "nsString.h"
  17 #include "nsIClassInfoImpl.h"
  18 #include "nsIScriptSecurityManager.h"
  19 #include "pratom.h"
  20
  21 using namespace mozilla;
  22
  23 NS_IMPL_CLASSINFO(SystemPrincipal, nullptr,
  24                   nsIClassInfo::SINGLETON | nsIClassInfo::MAIN_THREAD_ONLY,
  25                   NS_SYSTEMPRINCIPAL_CID)
  26 NS_IMPL_QUERY_INTERFACE_CI(SystemPrincipal, nsIPrincipal, nsISerializable)
  27 NS_IMPL_CI_INTERFACE_GETTER(SystemPrincipal, nsIPrincipal, nsISerializable)
  28
  29 #define SYSTEM_PRINCIPAL_SPEC "[System Principal]"
  30
  31 already_AddRefed<SystemPrincipal> SystemPrincipal::Create() {
  32   RefPtr<SystemPrincipal> sp = new SystemPrincipal();
  33   sp->FinishInit(NS_LITERAL_CSTRING(SYSTEM_PRINCIPAL_SPEC), OriginAttributes());
  34   return sp.forget();
  35 }
  36
  37 nsresult SystemPrincipal::GetScriptLocation(nsACString& aStr) {
  38   aStr.AssignLiteral(SYSTEM_PRINCIPAL_SPEC);
  39   return NS_OK;
  40 }
  41
  42 ///////////////////////////////////////
  43 // Methods implementing nsIPrincipal //
  44 ///////////////////////////////////////
  45
  46 uint32_t SystemPrincipal::GetHashValue() { return NS_PTR_TO_INT32(this); }
  47
  48 NS_IMETHODIMP
  49 SystemPrincipal::GetURI(nsIURI** aURI) {
  50   *aURI = nullptr;
  51   return NS_OK;
  52 }
  53
  54 NS_IMETHODIMP
  55 SystemPrincipal::GetCsp(nsIContentSecurityPolicy** aCsp) {
  56   *aCsp = nullptr;
  57   return NS_OK;
  58 }
  59
  60 NS_IMETHODIMP
  61 SystemPrincipal::SetCsp(nsIContentSecurityPolicy* aCsp) {
  62   // Never destroy an existing CSP on the principal.
  63   // This method should only be called in rare cases.
  64
  65   return NS_ERROR_FAILURE;
  66 }
  67
  68 NS_IMETHODIMP
  69 SystemPrincipal::EnsureCSP(dom::Document* aDocument,
  70                            nsIContentSecurityPolicy** aCSP) {
  71   // CSP on a system principal makes no sense
  72   return NS_ERROR_FAILURE;
  73 }
  74
  75 NS_IMETHODIMP
  76 SystemPrincipal::GetPreloadCsp(nsIContentSecurityPolicy** aPreloadCSP) {
  77   *aPreloadCSP = nullptr;
  78   return NS_OK;
  79 }
  80
  81 NS_IMETHODIMP
  82 SystemPrincipal::EnsurePreloadCSP(dom::Document* aDocument,
  83                                   nsIContentSecurityPolicy** aPreloadCSP) {
  84   // CSP on a system principal makes no sense
  85   return NS_ERROR_FAILURE;
  86 }
  87
  88 NS_IMETHODIMP
  89 SystemPrincipal::GetDomain(nsIURI** aDomain) {
  90   *aDomain = nullptr;
  91   return NS_OK;
  92 }
  93
  94 NS_IMETHODIMP
  95 SystemPrincipal::SetDomain(nsIURI* aDomain) { return NS_OK; }
  96
  97 NS_IMETHODIMP
  98 SystemPrincipal::GetBaseDomain(nsACString& aBaseDomain) {
  99   // No base domain for chrome.
 100   return NS_OK;
 101 }
 102
 103 NS_IMETHODIMP
 104 SystemPrincipal::GetAddonId(nsAString& aAddonId) {
 105   aAddonId.Truncate();
 106   return NS_OK;
 107 };
 108
 109 //////////////////////////////////////////
 110 // Methods implementing nsISerializable //
 111 //////////////////////////////////////////
 112
 113 NS_IMETHODIMP
 114 SystemPrincipal::Read(nsIObjectInputStream* aStream) {
 115   // no-op: CID is sufficient to identify the mSystemPrincipal singleton
 116   return NS_OK;
 117 }
 118
 119 NS_IMETHODIMP
 120 SystemPrincipal::Write(nsIObjectOutputStream* aStream) {
 121   // no-op: CID is sufficient to identify the mSystemPrincipal singleton
 122   return NS_OK;
 123 }