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gecko/caps/include/nsScriptSecurityManager.h
Igor Bukanov fbeb82e29f bug 730221 - delegating serialization of script principals to the embedding. r=:luke,:bz 
Currently to serialize principals stored in JSScript we have a rather complex
schema. First there is the transcode callback that the embedding must provide
to transcode principals using XDR API. Second we use rather complex glue code
to implement that callback in terms of writing/reading nsIObjectOutputStream/
nsIObjectInputStream. This glue code is duplicated in 3 places. All this can
be avoided if we simply delegate transcoding of principals to the caller. In
addition, at least in the case of the cached startup scripts we do not even
need to transcode the principals as the the cached scripts always have the
system principal so we can skip all the transcode complexity there.

The patch implemnts this idea. In particular, the code in JS engine
responsible for transcoding of principals is replaced by the single API
function JS_XDRSetPrincipals that the embedding can use to set principals for
decoded scripts and functions. Then the startup cache uses this to set the
principals for the decoded script to the system principals. The other two
places in nsJSContext::Serialize and  XBL_SerializeFunction that need to
serialize principals together with a function or script now uses common
utilities in nsXPConnect so the serialization complexity resides in the single
 place.
2012-02-13 14:10:04 +01:00

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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Norris Boyd <nboyd@atg.com>
* Mitch Stoltz <mstoltz@netscape.com>
* Christopher A. Aillon <christopher@aillon.com>
* Giorgio Maone <g.maone@informaction.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef nsScriptSecurityManager_h__
#define nsScriptSecurityManager_h__
#include "nsIScriptSecurityManager.h"
#include "nsIPrincipal.h"
#include "jsapi.h"
#include "jsdbgapi.h"
#include "nsIXPCSecurityManager.h"
#include "nsInterfaceHashtable.h"
#include "nsHashtable.h"
#include "nsCOMPtr.h"
#include "nsIChannelEventSink.h"
#include "nsIJSContextStack.h"
#include "nsIObserver.h"
#include "pldhash.h"
#include "plstr.h"
#include "nsIScriptExternalNameSet.h"
class nsIDocShell;
class nsString;
class nsIClassInfo;
class nsIIOService;
class nsIXPConnect;
class nsIStringBundle;
class nsSystemPrincipal;
struct ClassPolicy;
class ClassInfoData;
class DomainPolicy;
#if defined(DEBUG_mstoltz) || defined(DEBUG_caillon)
#define DEBUG_CAPS_HACKER
#endif
#ifdef DEBUG_CAPS_HACKER
#define DEBUG_CAPS_CheckPropertyAccessImpl
#define DEBUG_CAPS_LookupPolicy
#define DEBUG_CAPS_CheckComponentPermissions
#endif
#if 0
#define DEBUG_CAPS_CanCreateWrapper
#define DEBUG_CAPS_CanCreateInstance
#define DEBUG_CAPS_CanGetService
#define DEBUG_CAPS_DomainPolicyLifeCycle
#endif
/////////////////////
// PrincipalKey //
/////////////////////
class PrincipalKey : public PLDHashEntryHdr
{
public:
typedef const nsIPrincipal* KeyType;
typedef const nsIPrincipal* KeyTypePointer;
PrincipalKey(const nsIPrincipal* key)
: mKey(const_cast<nsIPrincipal*>(key))
{
}
PrincipalKey(const PrincipalKey& toCopy)
: mKey(toCopy.mKey)
{
}
~PrincipalKey()
{
}
KeyType GetKey() const
{
return mKey;
}
bool KeyEquals(KeyTypePointer aKey) const
{
bool eq;
mKey->Equals(const_cast<nsIPrincipal*>(aKey),
&eq);
return eq;
}
static KeyTypePointer KeyToPointer(KeyType aKey)
{
return aKey;
}
static PLDHashNumber HashKey(KeyTypePointer aKey)
{
PRUint32 hash;
const_cast<nsIPrincipal*>(aKey)->GetHashValue(&hash);
return PLDHashNumber(hash);
}
enum { ALLOW_MEMMOVE = true };
private:
nsCOMPtr<nsIPrincipal> mKey;
};
////////////////////
// Policy Storage //
////////////////////
// Property Policy
union SecurityLevel
{
PRWord level;
char* capability;
};
// Security levels
// These values all have the low bit set (except UNDEFINED_ACCESS)
// to distinguish them from pointer values, because no pointer
// to allocated memory ever has the low bit set. A SecurityLevel
// contains either one of these constants or a pointer to a string
// representing the name of a capability.
#define SCRIPT_SECURITY_UNDEFINED_ACCESS 0
#define SCRIPT_SECURITY_ACCESS_IS_SET_BIT 1
#define SCRIPT_SECURITY_NO_ACCESS \
((1 << 0) | SCRIPT_SECURITY_ACCESS_IS_SET_BIT)
#define SCRIPT_SECURITY_SAME_ORIGIN_ACCESS \
((1 << 1) | SCRIPT_SECURITY_ACCESS_IS_SET_BIT)
#define SCRIPT_SECURITY_ALL_ACCESS \
((1 << 2) | SCRIPT_SECURITY_ACCESS_IS_SET_BIT)
#define SECURITY_ACCESS_LEVEL_FLAG(_sl) \
((_sl.level == 0) || \
(_sl.level & SCRIPT_SECURITY_ACCESS_IS_SET_BIT))
struct PropertyPolicy : public PLDHashEntryHdr
{
JSString *key; // interned string
SecurityLevel mGet;
SecurityLevel mSet;
};
static bool
InitPropertyPolicyEntry(PLDHashTable *table,
PLDHashEntryHdr *entry,
const void *key)
{
PropertyPolicy* pp = (PropertyPolicy*)entry;
pp->key = (JSString *)key;
pp->mGet.level = SCRIPT_SECURITY_UNDEFINED_ACCESS;
pp->mSet.level = SCRIPT_SECURITY_UNDEFINED_ACCESS;
return true;
}
static void
ClearPropertyPolicyEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
{
PropertyPolicy* pp = (PropertyPolicy*)entry;
pp->key = NULL;
}
// Class Policy
#define NO_POLICY_FOR_CLASS (ClassPolicy*)1
struct ClassPolicy : public PLDHashEntryHdr
{
char* key;
PLDHashTable* mPolicy;
// Note: the DomainPolicy owns us, so if if dies we will too. Hence no
// need to refcount it here (and in fact, we'd probably leak if we tried).
DomainPolicy* mDomainWeAreWildcardFor;
};
static void
ClearClassPolicyEntry(PLDHashTable *table, PLDHashEntryHdr *entry)
{
ClassPolicy* cp = (ClassPolicy *)entry;
if (cp->key)
{
PL_strfree(cp->key);
cp->key = nsnull;
}
PL_DHashTableDestroy(cp->mPolicy);
}
// Note: actual impl is going to be after the DomainPolicy class definition,
// since we need to access members of DomainPolicy in the impl
static void
MoveClassPolicyEntry(PLDHashTable *table,
const PLDHashEntryHdr *from,
PLDHashEntryHdr *to);
static bool
InitClassPolicyEntry(PLDHashTable *table,
PLDHashEntryHdr *entry,
const void *key)
{
static PLDHashTableOps classPolicyOps =
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashVoidPtrKeyStub,
PL_DHashMatchEntryStub,
PL_DHashMoveEntryStub,
ClearPropertyPolicyEntry,
PL_DHashFinalizeStub,
InitPropertyPolicyEntry
};
ClassPolicy* cp = (ClassPolicy*)entry;
cp->mDomainWeAreWildcardFor = nsnull;
cp->key = PL_strdup((const char*)key);
if (!cp->key)
return false;
cp->mPolicy = PL_NewDHashTable(&classPolicyOps, nsnull,
sizeof(PropertyPolicy), 16);
if (!cp->mPolicy) {
PL_strfree(cp->key);
cp->key = nsnull;
return false;
}
return true;
}
// Domain Policy
class DomainPolicy : public PLDHashTable
{
public:
DomainPolicy() : mWildcardPolicy(nsnull),
mRefCount(0)
{
mGeneration = sGeneration;
#ifdef DEBUG_CAPS_DomainPolicyLifeCycle
++sObjects;
_printPopulationInfo();
#endif
}
bool Init()
{
static const PLDHashTableOps domainPolicyOps =
{
PL_DHashAllocTable,
PL_DHashFreeTable,
PL_DHashStringKey,
PL_DHashMatchStringKey,
MoveClassPolicyEntry,
ClearClassPolicyEntry,
PL_DHashFinalizeStub,
InitClassPolicyEntry
};
return PL_DHashTableInit(this, &domainPolicyOps, nsnull,
sizeof(ClassPolicy), 16);
}
~DomainPolicy()
{
PL_DHashTableFinish(this);
NS_ASSERTION(mRefCount == 0, "Wrong refcount in DomainPolicy dtor");
#ifdef DEBUG_CAPS_DomainPolicyLifeCycle
printf("DomainPolicy deleted with mRefCount = %d\n", mRefCount);
--sObjects;
_printPopulationInfo();
#endif
}
void Hold()
{
mRefCount++;
}
void Drop()
{
if (--mRefCount == 0)
delete this;
}
static void InvalidateAll()
{
sGeneration++;
}
bool IsInvalid()
{
return mGeneration != sGeneration;
}
ClassPolicy* mWildcardPolicy;
private:
PRUint32 mRefCount;
PRUint32 mGeneration;
static PRUint32 sGeneration;
#ifdef DEBUG_CAPS_DomainPolicyLifeCycle
static PRUint32 sObjects;
static void _printPopulationInfo();
#endif
};
static void
MoveClassPolicyEntry(PLDHashTable *table,
const PLDHashEntryHdr *from,
PLDHashEntryHdr *to)
{
memcpy(to, from, table->entrySize);
// Now update the mDefaultPolicy pointer that points to us, if any.
ClassPolicy* cp = static_cast<ClassPolicy*>(to);
if (cp->mDomainWeAreWildcardFor) {
NS_ASSERTION(cp->mDomainWeAreWildcardFor->mWildcardPolicy ==
static_cast<const ClassPolicy*>(from),
"Unexpected wildcard policy on mDomainWeAreWildcardFor");
cp->mDomainWeAreWildcardFor->mWildcardPolicy = cp;
}
}
/////////////////////////////
// nsScriptSecurityManager //
/////////////////////////////
#define NS_SCRIPTSECURITYMANAGER_CID \
{ 0x7ee2a4c0, 0x4b93, 0x17d3, \
{ 0xba, 0x18, 0x00, 0x60, 0xb0, 0xf1, 0x99, 0xa2 }}
class nsScriptSecurityManager : public nsIScriptSecurityManager,
public nsIChannelEventSink,
public nsIObserver
{
public:
static void Shutdown();
NS_DEFINE_STATIC_CID_ACCESSOR(NS_SCRIPTSECURITYMANAGER_CID)
NS_DECL_ISUPPORTS
NS_DECL_NSISCRIPTSECURITYMANAGER
NS_DECL_NSIXPCSECURITYMANAGER
NS_DECL_NSICHANNELEVENTSINK
NS_DECL_NSIOBSERVER
static nsScriptSecurityManager*
GetScriptSecurityManager();
static nsSystemPrincipal*
SystemPrincipalSingletonConstructor();
JSContext* GetCurrentJSContext();
JSContext* GetSafeJSContext();
/**
* Utility method for comparing two URIs. For security purposes, two URIs
* are equivalent if their schemes, hosts, and ports (if any) match. This
* method returns true if aSubjectURI and aObjectURI have the same origin,
* false otherwise.
*/
static bool SecurityCompareURIs(nsIURI* aSourceURI, nsIURI* aTargetURI);
static PRUint32 SecurityHashURI(nsIURI* aURI);
static nsresult
ReportError(JSContext* cx, const nsAString& messageTag,
nsIURI* aSource, nsIURI* aTarget);
static nsresult
CheckSameOriginPrincipal(nsIPrincipal* aSubject,
nsIPrincipal* aObject);
static PRUint32
HashPrincipalByOrigin(nsIPrincipal* aPrincipal);
static bool
GetStrictFileOriginPolicy()
{
return sStrictFileOriginPolicy;
}
private:
// GetScriptSecurityManager is the only call that can make one
nsScriptSecurityManager();
virtual ~nsScriptSecurityManager();
static JSBool
CheckObjectAccess(JSContext *cx, JSObject *obj,
jsid id, JSAccessMode mode,
jsval *vp);
static JSPrincipals *
ObjectPrincipalFinder(JSObject *obj);
// Decides, based on CSP, whether or not eval() and stuff can be executed.
static JSBool
ContentSecurityPolicyPermitsJSAction(JSContext *cx);
// Returns null if a principal cannot be found; generally callers
// should error out at that point.
static nsIPrincipal*
doGetObjectPrincipal(JSObject *obj
#ifdef DEBUG
, bool aAllowShortCircuit = true
#endif
);
// Returns null if a principal cannot be found. Note that rv can be NS_OK
// when this happens -- this means that there was no JS running.
nsIPrincipal*
doGetSubjectPrincipal(nsresult* rv);
nsresult
CheckPropertyAccessImpl(PRUint32 aAction,
nsAXPCNativeCallContext* aCallContext,
JSContext* cx, JSObject* aJSObject,
nsISupports* aObj, nsIURI* aTargetURI,
nsIClassInfo* aClassInfo,
const char* aClassName, jsid aProperty,
void** aCachedClassPolicy);
nsresult
CheckSameOriginDOMProp(nsIPrincipal* aSubject,
nsIPrincipal* aObject,
PRUint32 aAction);
nsresult
LookupPolicy(nsIPrincipal* principal,
ClassInfoData& aClassData, jsid aProperty,
PRUint32 aAction,
ClassPolicy** aCachedClassPolicy,
SecurityLevel* result);
nsresult
CreateCodebasePrincipal(nsIURI* aURI, nsIPrincipal** result);
// This is just like the API method, but it doesn't check that the subject
// name is non-empty or aCertificate is non-null, and it doesn't change the
// certificate in the table (if any) in any way if aModifyTable is false.
nsresult
DoGetCertificatePrincipal(const nsACString& aCertFingerprint,
const nsACString& aSubjectName,
const nsACString& aPrettyName,
nsISupports* aCertificate,
nsIURI* aURI,
bool aModifyTable,
nsIPrincipal **result);
// Returns null if a principal cannot be found. Note that rv can be NS_OK
// when this happens -- this means that there was no script for the
// context. Callers MUST pass in a non-null rv here.
nsIPrincipal*
GetSubjectPrincipal(JSContext* cx, nsresult* rv);
// Returns null if a principal cannot be found. Note that rv can be NS_OK
// when this happens -- this means that there was no script for the frame.
// Callers MUST pass in a non-null rv here.
nsIPrincipal*
GetFramePrincipal(JSContext* cx, JSStackFrame* fp, nsresult* rv);
// Returns null if a principal cannot be found. Note that rv can be NS_OK
// when this happens -- this means that there was no script. Callers MUST
// pass in a non-null rv here.
static nsIPrincipal*
GetScriptPrincipal(JSScript* script, nsresult* rv);
// Returns null if a principal cannot be found. Note that rv can be NS_OK
// when this happens -- this means that there was no script associated
// with the function object, and no global object associated with the scope
// of obj (the last object on its parent chain). If the caller is walking
// the JS stack, fp must point to the current frame in the stack iteration.
// Callers MUST pass in a non-null rv here.
static nsIPrincipal*
GetFunctionObjectPrincipal(JSContext* cx, JSObject* obj, JSStackFrame *fp,
nsresult* rv);
// Returns null if a principal cannot be found. Note that rv can be NS_OK
// when this happens -- this means that there was no script
// running. Callers MUST pass in a non-null rv here.
nsIPrincipal*
GetPrincipalAndFrame(JSContext *cx,
JSStackFrame** frameResult,
nsresult* rv);
static bool
CheckConfirmDialog(JSContext* cx, nsIPrincipal* aPrincipal,
const char* aCapability, bool *checkValue);
static void
FormatCapabilityString(nsAString& aCapability);
nsresult
SavePrincipal(nsIPrincipal* aToSave);
/**
* Check capability levels for an |aObj| that implements
* nsISecurityCheckedComponent.
*
* NB: This function also checks to see if aObj is a plugin and the user
* has set the "security.xpconnect.plugin.unrestricted" pref to allow
* anybody to script plugin objects from anywhere.
*
* @param cx The context we're running on.
* NB: If null, "sameOrigin" does not have any effect.
* @param aObj The nsISupports representation of the object in question
* object, possibly null.
* @param aJSObject The JSObject representation of the object in question
* if |cx| is non-null and |aObjectSecurityLevel| is
* "sameOrigin". If null will be calculated from aObj (if
* non-null) if and only if aObj is an XPCWrappedJS. The
* rationale behind this is that if we're creating a JS
* wrapper for an XPCWrappedJS, this object definitely
* expects to be exposed to JS.
* @param aSubjectPrincipal The nominal subject principal used when
* aObjectSecurityLevel is "sameOrigin". If null,
* this is calculated if it's needed.
* @param aObjectSecurityLevel Can be one of three values:
* - allAccess: Allow access no matter what.
* - noAccess: Deny access no matter what.
* - sameOrigin: If |cx| is null, behave like noAccess.
* Otherwise, possibly compute a subject
* and object principal and return true if
* and only if the subject has greater than
* or equal privileges to the object.
*/
nsresult
CheckXPCPermissions(JSContext* cx,
nsISupports* aObj, JSObject* aJSObject,
nsIPrincipal* aSubjectPrincipal,
const char* aObjectSecurityLevel);
nsresult
Init();
nsresult
InitPrefs();
static nsresult
GetPrincipalPrefNames(const char* prefBase,
nsCString& grantedPref,
nsCString& deniedPref,
nsCString& subjectNamePref);
nsresult
InitPolicies();
nsresult
InitDomainPolicy(JSContext* cx, const char* aPolicyName,
DomainPolicy* aDomainPolicy);
nsresult
InitPrincipals(PRUint32 prefCount, const char** prefNames);
#ifdef DEBUG_CAPS_HACKER
void
PrintPolicyDB();
#endif
struct ContextPrincipal {
ContextPrincipal(ContextPrincipal *next, JSContext *cx,
JSStackFrame *fp, nsIPrincipal *principal)
: mNext(next), mCx(cx), mFp(fp), mPrincipal(principal) {}
ContextPrincipal *mNext;
JSContext *mCx;
JSStackFrame *mFp;
nsCOMPtr<nsIPrincipal> mPrincipal;
};
// JS strings we need to clean up on shutdown
static jsid sEnabledID;
inline void
ScriptSecurityPrefChanged();
nsObjectHashtable* mOriginToPolicyMap;
DomainPolicy* mDefaultPolicy;
nsObjectHashtable* mCapabilities;
nsCOMPtr<nsIPrincipal> mSystemPrincipal;
nsCOMPtr<nsIPrincipal> mSystemCertificate;
ContextPrincipal *mContextPrincipals;
nsInterfaceHashtable<PrincipalKey, nsIPrincipal> mPrincipals;
bool mPrefInitialized;
bool mIsJavaScriptEnabled;
bool mIsWritingPrefs;
bool mPolicyPrefsChanged;
static bool sStrictFileOriginPolicy;
static nsIIOService *sIOService;
static nsIXPConnect *sXPConnect;
static nsIThreadJSContextStack* sJSContextStack;
static nsIStringBundle *sStrBundle;
static JSRuntime *sRuntime;
};
#define NS_SECURITYNAMESET_CID \
{ 0x7c02eadc, 0x76, 0x4d03, \
{ 0x99, 0x8d, 0x80, 0xd7, 0x79, 0xc4, 0x85, 0x89 } }
#define NS_SECURITYNAMESET_CONTRACTID "@mozilla.org/security/script/nameset;1"
class nsSecurityNameSet : public nsIScriptExternalNameSet
{
public:
nsSecurityNameSet();
virtual ~nsSecurityNameSet();
NS_DECL_ISUPPORTS
NS_IMETHOD InitializeNameSet(nsIScriptContext* aScriptContext);
};
#endif // nsScriptSecurityManager_h__
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