caps/SystemPrincipal.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   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 NS_IMPL_CLASSINFO(SystemPrincipal, nullptr,
  22                   nsIClassInfo::SINGLETON | nsIClassInfo::MAIN_THREAD_ONLY,
  23                   NS_SYSTEMPRINCIPAL_CID)
  24 NS_IMPL_QUERY_INTERFACE_CI(SystemPrincipal,
  25                            nsIPrincipal,
  26                            nsISerializable)
  27 NS_IMPL_CI_INTERFACE_GETTER(SystemPrincipal,
  28                             nsIPrincipal,
  29                             nsISerializable)
  30
  31 #define SYSTEM_PRINCIPAL_SPEC "[System Principal]"
  32
  33 already_AddRefed<SystemPrincipal>
  34 SystemPrincipal::Create()
  35 {
  36   RefPtr<SystemPrincipal> sp = new SystemPrincipal();
  37   sp->FinishInit(NS_LITERAL_CSTRING(SYSTEM_PRINCIPAL_SPEC),
  38                  OriginAttributes());
  39   return sp.forget();
  40 }
  41
  42 nsresult
  43 SystemPrincipal::GetScriptLocation(nsACString &aStr)
  44 {
  45     aStr.AssignLiteral(SYSTEM_PRINCIPAL_SPEC);
  46     return NS_OK;
  47 }
  48
  49 ///////////////////////////////////////
  50 // Methods implementing nsIPrincipal //
  51 ///////////////////////////////////////
  52
  53 NS_IMETHODIMP
  54 SystemPrincipal::GetHashValue(uint32_t *result)
  55 {
  56     *result = NS_PTR_TO_INT32(this);
  57     return NS_OK;
  58 }
  59
  60 NS_IMETHODIMP
  61 SystemPrincipal::GetURI(nsIURI** aURI)
  62 {
  63     *aURI = nullptr;
  64     return NS_OK;
  65 }
  66
  67 NS_IMETHODIMP
  68 SystemPrincipal::GetCsp(nsIContentSecurityPolicy** aCsp)
  69 {
  70   *aCsp = nullptr;
  71   return NS_OK;
  72 }
  73
  74 NS_IMETHODIMP
  75 SystemPrincipal::SetCsp(nsIContentSecurityPolicy* aCsp)
  76 {
  77   // Never destroy an existing CSP on the principal.
  78   // This method should only be called in rare cases.
  79
  80   return NS_ERROR_FAILURE;
  81 }
  82
  83 NS_IMETHODIMP
  84 SystemPrincipal::EnsureCSP(nsIDOMDocument* aDocument,
  85                            nsIContentSecurityPolicy** aCSP)
  86 {
  87   // CSP on a system principal makes no sense
  88   return NS_ERROR_FAILURE;
  89 }
  90
  91 NS_IMETHODIMP
  92 SystemPrincipal::GetPreloadCsp(nsIContentSecurityPolicy** aPreloadCSP)
  93 {
  94   *aPreloadCSP = nullptr;
  95   return NS_OK;
  96 }
  97
  98 NS_IMETHODIMP
  99 SystemPrincipal::EnsurePreloadCSP(nsIDOMDocument* aDocument,
 100                                   nsIContentSecurityPolicy** aPreloadCSP)
 101 {
 102   // CSP on a system principal makes no sense
 103   return NS_OK;
 104 }
 105
 106 NS_IMETHODIMP
 107 SystemPrincipal::GetDomain(nsIURI** aDomain)
 108 {
 109     *aDomain = nullptr;
 110     return NS_OK;
 111 }
 112
 113 NS_IMETHODIMP
 114 SystemPrincipal::SetDomain(nsIURI* aDomain)
 115 {
 116   return NS_OK;
 117 }
 118
 119 NS_IMETHODIMP
 120 SystemPrincipal::GetBaseDomain(nsACString& aBaseDomain)
 121 {
 122   // No base domain for chrome.
 123   return NS_OK;
 124 }
 125
 126 NS_IMETHODIMP
 127 SystemPrincipal::GetAddonId(nsAString& aAddonId)
 128 {
 129   aAddonId.Truncate();
 130   return NS_OK;
 131 };
 132
 133 //////////////////////////////////////////
 134 // Methods implementing nsISerializable //
 135 //////////////////////////////////////////
 136
 137 NS_IMETHODIMP
 138 SystemPrincipal::Read(nsIObjectInputStream* aStream)
 139 {
 140     // no-op: CID is sufficient to identify the mSystemPrincipal singleton
 141     return NS_OK;
 142 }
 143
 144 NS_IMETHODIMP
 145 SystemPrincipal::Write(nsIObjectOutputStream* aStream)
 146 {
 147     // no-op: CID is sufficient to identify the mSystemPrincipal singleton
 148     return NS_OK;
 149 }