Code:
/ 4.0 / 4.0 / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / Base / System / IO / Packaging / PackageDigitalSignature.cs / 1305600 / PackageDigitalSignature.cs
//------------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// This class represents a PackageDigitalSignature. It is immutable.
//
// History:
// 03/22/2004: BruceMac: Initial Implementation
// 01/21/2005: BruceMac: Update for DigSig Security Mitigation DCR
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Windows; // For Exception strings - SRID
using System.Text; // for StringBuilder
using System.Diagnostics; // for Assert
using System.Security; // for SecurityCritical
using System.Security.Cryptography.Xml; // for Xml Signature classes
using System.Security.Cryptography.X509Certificates;
using System.Security.Cryptography;
using MS.Internal.IO.Packaging; // helper classes Certificate, HashStream
using System.Collections.ObjectModel; // for ReadOnlyCollection<>
using MS.Internal.WindowsBase;
namespace System.IO.Packaging
{
///
/// VerifyResult
///
public enum VerifyResult : int
{
///
/// Verification succeeded
///
Success, // signature valid
///
/// Signature was invalid (tampering detected)
///
InvalidSignature, // hash incorrect
///
/// Certificate was not embedded in container and caller did not supply one
///
CertificateRequired, // no certificate is embedded in container - caller must provide one
///
/// Certificate was invalid (perhaps expired?)
///
InvalidCertificate, // certificate problem - verify does not fully verify cert
///
/// PackagePart was missing - signature invalid
///
ReferenceNotFound, // signature failed because a part is missing
///
/// Package not signed
///
NotSigned // no signatures were found
}
///
/// PackageDigitalSignature
///
public class PackageDigitalSignature
{
#region Public Members
//-----------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
///
/// Parts that are covered by this signature
///
/// read only list
/// Thrown if associated digital signature has been deleted.
public ReadOnlyCollection SignedParts
{
get
{
ThrowIfInvalidated();
// wrap in read-only collection to protect against alteration
if (_signedParts == null)
_signedParts = new ReadOnlyCollection(_processor.PartManifest);
return _signedParts;
}
}
///
/// Relationships that are covered by this signature
///
/// read only list
/// Thrown if associated digital signature has been deleted.
public ReadOnlyCollection SignedRelationshipSelectors
{
get
{
ThrowIfInvalidated();
// wrap in read-only collection to protect against alteration
if (_signedRelationshipSelectors == null)
_signedRelationshipSelectors = new ReadOnlyCollection(_processor.RelationshipManifest);
return _signedRelationshipSelectors;
}
}
///
/// The part that contains the actual signature - useful for counter-signing scenarios
///
/// Thrown if associated digital signature has been deleted.
public PackagePart SignaturePart
{
get
{
ThrowIfInvalidated();
return _processor.SignaturePart;
}
}
///
/// Certificate of signer embedded in container
///
/// null if certificate was not embedded
/// Thrown if associated digital signature has been deleted.
public X509Certificate Signer
{
get
{
ThrowIfInvalidated();
return _processor.Signer;
}
}
///
/// Time signature was created - not a trusted TimeStamp
///
/// Thrown if associated digital signature has been deleted.
public DateTime SigningTime
{
get
{
ThrowIfInvalidated();
return _processor.SigningTime;
}
}
///
/// Format of time returned by SigningTime (see PackageDigitalSignatureManager.TimeFormat for details)
///
/// Thrown if associated digital signature has been deleted.
public String TimeFormat
{
get
{
ThrowIfInvalidated();
return _processor.TimeFormat;
}
}
///
/// encrypted hash value
///
/// Thrown if associated digital signature has been deleted.
public byte[] SignatureValue
{
get
{
ThrowIfInvalidated();
return _processor.SignatureValue;
}
}
///
/// Content Type of signature
///
/// Thrown if associated digital signature has been deleted.
public String SignatureType
{
get
{
ThrowIfInvalidated();
return XmlDigitalSignatureProcessor.ContentType.ToString();
}
}
///
/// Type-specific signature object
///
///
/// Provides access to the underlying class that performs the signature type-specific cryptographic
/// functions and serialization to/from the package part that houses the signature.
///
///
/// Returns an object of type System.Security.Cryptography.Xml.Signature.
/// Future signature types will return objects of different classes.
///
/// Thrown if associated digital signature has been deleted.
public Signature Signature
{
get
{
ThrowIfInvalidated();
return _processor.Signature;
}
set
{
ThrowIfInvalidated();
if (value == null)
throw new ArgumentNullException("value");
_processor.Signature = value;
}
}
///
/// Where is the certificate?
///
/// Thrown if associated digital signature has been deleted.
public CertificateEmbeddingOption CertificateEmbeddingOption
{
get
{
ThrowIfInvalidated();
if (GetCertificatePart() == null)
{
if (Signer == null)
{
return CertificateEmbeddingOption.NotEmbedded;
}
else
{
return CertificateEmbeddingOption.InSignaturePart;
}
}
else
{
return CertificateEmbeddingOption.InCertificatePart;
}
}
}
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
///
/// Returns ordered list of transforms applied to the given part
///
/// Thrown if associated digital signature has been deleted.
public List GetPartTransformList(Uri partName)
{
ThrowIfInvalidated();
// no need to clone this for return as it's already a single-use collection
return _processor.GetPartTransformList(partName);
}
///
/// Verify
///
/// cannot use this overload with signatures created without embedding their certs
/// Thrown if associated digital signature has been deleted.
public VerifyResult Verify()
{
ThrowIfInvalidated();
if (Signer == null)
return VerifyResult.CertificateRequired;
return Verify(Signer);
}
///
/// Verify
///
/// certificate used to create the signature
/// Use this overload when the certificate is not embedded in the container at signing time
/// Thrown if associated digital signature has been deleted.
///
/// Critical: calls X509Certificate2 ctor which LinkDemands
/// TreatAsSafe: X509Certificate2 is only used internally and not returned
///
[SecurityCritical, SecurityTreatAsSafe]
public VerifyResult Verify(X509Certificate signingCertificate)
{
ThrowIfInvalidated();
VerifyResult result = VerifyResult.NotSigned;
if (signingCertificate == null)
throw new ArgumentNullException("signingCertificate");
// Check for part existence
foreach (Uri partUri in SignedParts)
{
// check if they exist
if (!_manager.Package.PartExists(partUri))
{
return VerifyResult.ReferenceNotFound;
}
}
// convert to Ex variant that has more functionality
X509Certificate2 certificate = signingCertificate as X509Certificate2;
if (certificate == null)
certificate = new X509Certificate2(signingCertificate.Handle);
// verify
if (_processor.Verify(certificate))
result = VerifyResult.Success;
else
result = VerifyResult.InvalidSignature;
return result;
}
#endregion
#region Internal Members
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
///
/// Constructor for creating a new signature
///
/// digital signature manager - to consult for hash, embedding and other options
/// digital signature manager - to consult for hash, embedding and other options
internal PackageDigitalSignature(
PackageDigitalSignatureManager manager,
XmlDigitalSignatureProcessor processor)
{
Debug.Assert(processor.PackageSignature == null, "Logic Error: one processor per-signature");
_manager = manager;
_processor = processor;
// _processor.PackageSignature = this;
}
///
/// Constructor for use when opening an existing signature
///
/// digital signature manager - to consult for hash, embedding and other options
/// part that houses the signature
internal PackageDigitalSignature(
PackageDigitalSignatureManager manager,
PackagePart signaturePart)
{
_manager = manager;
_processor = new XmlDigitalSignatureProcessor(manager, signaturePart, this);
}
///
/// This is called when the underlying signature is deleted - it prevents usage of the object
///
internal void Invalidate()
{
_invalid = true;
}
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
///
/// Get certificate part - null if none
///
internal CertificatePart GetCertificatePart()
{
// lazy init
if (_certificatePart == null && !_alreadyLookedForCertPart)
{
PackageRelationshipCollection relationships = SignaturePart.GetRelationshipsByType(
CertificatePart.RelationshipType);
foreach (PackageRelationship relationship in relationships)
{
// don't resolve if external
if (relationship.TargetMode != TargetMode.Internal)
throw new FileFormatException(SR.Get(SRID.PackageSignatureCorruption));
Uri resolvedUri = PackUriHelper.ResolvePartUri(SignaturePart.Uri, relationship.TargetUri);
// don't create if it doesn't exist
if (!_manager.Package.PartExists(resolvedUri))
{
continue;
}
// find the cert
_certificatePart = new CertificatePart(_manager.Package, resolvedUri);
break;
}
_alreadyLookedForCertPart = true;
}
return _certificatePart;
}
internal void SetCertificatePart(CertificatePart certificatePart)
{
Debug.Assert(certificatePart != null, "Logic Error: Not expecting setting certificate part to null on digital signature");
_certificatePart = certificatePart;
}
#endregion
#region Private Methods
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
///
/// ThrowIfInvalidated - check on each access
///
private void ThrowIfInvalidated()
{
if (_invalid)
throw new InvalidOperationException(SR.Get(SRID.SignatureDeleted));
}
#endregion Private Methods
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
private PackageDigitalSignatureManager _manager;
private XmlDigitalSignatureProcessor _processor;
private CertificatePart _certificatePart;
private ReadOnlyCollection _signedParts;
private ReadOnlyCollection _signedRelationshipSelectors;
private bool _alreadyLookedForCertPart;
private bool _invalid; // have we been invalidated?
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
//------------------------------------------------------------------------------
//
//
// Copyright (C) Microsoft Corporation. All rights reserved.
//
//
// Description:
// This class represents a PackageDigitalSignature. It is immutable.
//
// History:
// 03/22/2004: BruceMac: Initial Implementation
// 01/21/2005: BruceMac: Update for DigSig Security Mitigation DCR
//
//-----------------------------------------------------------------------------
using System;
using System.Collections.Generic;
using System.Windows; // For Exception strings - SRID
using System.Text; // for StringBuilder
using System.Diagnostics; // for Assert
using System.Security; // for SecurityCritical
using System.Security.Cryptography.Xml; // for Xml Signature classes
using System.Security.Cryptography.X509Certificates;
using System.Security.Cryptography;
using MS.Internal.IO.Packaging; // helper classes Certificate, HashStream
using System.Collections.ObjectModel; // for ReadOnlyCollection<>
using MS.Internal.WindowsBase;
namespace System.IO.Packaging
{
///
/// VerifyResult
///
public enum VerifyResult : int
{
///
/// Verification succeeded
///
Success, // signature valid
///
/// Signature was invalid (tampering detected)
///
InvalidSignature, // hash incorrect
///
/// Certificate was not embedded in container and caller did not supply one
///
CertificateRequired, // no certificate is embedded in container - caller must provide one
///
/// Certificate was invalid (perhaps expired?)
///
InvalidCertificate, // certificate problem - verify does not fully verify cert
///
/// PackagePart was missing - signature invalid
///
ReferenceNotFound, // signature failed because a part is missing
///
/// Package not signed
///
NotSigned // no signatures were found
}
///
/// PackageDigitalSignature
///
public class PackageDigitalSignature
{
#region Public Members
//-----------------------------------------------------
//
// Public Properties
//
//-----------------------------------------------------
///
/// Parts that are covered by this signature
///
/// read only list
/// Thrown if associated digital signature has been deleted.
public ReadOnlyCollection SignedParts
{
get
{
ThrowIfInvalidated();
// wrap in read-only collection to protect against alteration
if (_signedParts == null)
_signedParts = new ReadOnlyCollection(_processor.PartManifest);
return _signedParts;
}
}
///
/// Relationships that are covered by this signature
///
/// read only list
/// Thrown if associated digital signature has been deleted.
public ReadOnlyCollection SignedRelationshipSelectors
{
get
{
ThrowIfInvalidated();
// wrap in read-only collection to protect against alteration
if (_signedRelationshipSelectors == null)
_signedRelationshipSelectors = new ReadOnlyCollection(_processor.RelationshipManifest);
return _signedRelationshipSelectors;
}
}
///
/// The part that contains the actual signature - useful for counter-signing scenarios
///
/// Thrown if associated digital signature has been deleted.
public PackagePart SignaturePart
{
get
{
ThrowIfInvalidated();
return _processor.SignaturePart;
}
}
///
/// Certificate of signer embedded in container
///
/// null if certificate was not embedded
/// Thrown if associated digital signature has been deleted.
public X509Certificate Signer
{
get
{
ThrowIfInvalidated();
return _processor.Signer;
}
}
///
/// Time signature was created - not a trusted TimeStamp
///
/// Thrown if associated digital signature has been deleted.
public DateTime SigningTime
{
get
{
ThrowIfInvalidated();
return _processor.SigningTime;
}
}
///
/// Format of time returned by SigningTime (see PackageDigitalSignatureManager.TimeFormat for details)
///
/// Thrown if associated digital signature has been deleted.
public String TimeFormat
{
get
{
ThrowIfInvalidated();
return _processor.TimeFormat;
}
}
///
/// encrypted hash value
///
/// Thrown if associated digital signature has been deleted.
public byte[] SignatureValue
{
get
{
ThrowIfInvalidated();
return _processor.SignatureValue;
}
}
///
/// Content Type of signature
///
/// Thrown if associated digital signature has been deleted.
public String SignatureType
{
get
{
ThrowIfInvalidated();
return XmlDigitalSignatureProcessor.ContentType.ToString();
}
}
///
/// Type-specific signature object
///
///
/// Provides access to the underlying class that performs the signature type-specific cryptographic
/// functions and serialization to/from the package part that houses the signature.
///
///
/// Returns an object of type System.Security.Cryptography.Xml.Signature.
/// Future signature types will return objects of different classes.
///
/// Thrown if associated digital signature has been deleted.
public Signature Signature
{
get
{
ThrowIfInvalidated();
return _processor.Signature;
}
set
{
ThrowIfInvalidated();
if (value == null)
throw new ArgumentNullException("value");
_processor.Signature = value;
}
}
///
/// Where is the certificate?
///
/// Thrown if associated digital signature has been deleted.
public CertificateEmbeddingOption CertificateEmbeddingOption
{
get
{
ThrowIfInvalidated();
if (GetCertificatePart() == null)
{
if (Signer == null)
{
return CertificateEmbeddingOption.NotEmbedded;
}
else
{
return CertificateEmbeddingOption.InSignaturePart;
}
}
else
{
return CertificateEmbeddingOption.InCertificatePart;
}
}
}
//------------------------------------------------------
//
// Public Methods
//
//-----------------------------------------------------
///
/// Returns ordered list of transforms applied to the given part
///
/// Thrown if associated digital signature has been deleted.
public List GetPartTransformList(Uri partName)
{
ThrowIfInvalidated();
// no need to clone this for return as it's already a single-use collection
return _processor.GetPartTransformList(partName);
}
///
/// Verify
///
/// cannot use this overload with signatures created without embedding their certs
/// Thrown if associated digital signature has been deleted.
public VerifyResult Verify()
{
ThrowIfInvalidated();
if (Signer == null)
return VerifyResult.CertificateRequired;
return Verify(Signer);
}
///
/// Verify
///
/// certificate used to create the signature
/// Use this overload when the certificate is not embedded in the container at signing time
/// Thrown if associated digital signature has been deleted.
///
/// Critical: calls X509Certificate2 ctor which LinkDemands
/// TreatAsSafe: X509Certificate2 is only used internally and not returned
///
[SecurityCritical, SecurityTreatAsSafe]
public VerifyResult Verify(X509Certificate signingCertificate)
{
ThrowIfInvalidated();
VerifyResult result = VerifyResult.NotSigned;
if (signingCertificate == null)
throw new ArgumentNullException("signingCertificate");
// Check for part existence
foreach (Uri partUri in SignedParts)
{
// check if they exist
if (!_manager.Package.PartExists(partUri))
{
return VerifyResult.ReferenceNotFound;
}
}
// convert to Ex variant that has more functionality
X509Certificate2 certificate = signingCertificate as X509Certificate2;
if (certificate == null)
certificate = new X509Certificate2(signingCertificate.Handle);
// verify
if (_processor.Verify(certificate))
result = VerifyResult.Success;
else
result = VerifyResult.InvalidSignature;
return result;
}
#endregion
#region Internal Members
//------------------------------------------------------
//
// Internal Methods
//
//------------------------------------------------------
///
/// Constructor for creating a new signature
///
/// digital signature manager - to consult for hash, embedding and other options
/// digital signature manager - to consult for hash, embedding and other options
internal PackageDigitalSignature(
PackageDigitalSignatureManager manager,
XmlDigitalSignatureProcessor processor)
{
Debug.Assert(processor.PackageSignature == null, "Logic Error: one processor per-signature");
_manager = manager;
_processor = processor;
// _processor.PackageSignature = this;
}
///
/// Constructor for use when opening an existing signature
///
/// digital signature manager - to consult for hash, embedding and other options
/// part that houses the signature
internal PackageDigitalSignature(
PackageDigitalSignatureManager manager,
PackagePart signaturePart)
{
_manager = manager;
_processor = new XmlDigitalSignatureProcessor(manager, signaturePart, this);
}
///
/// This is called when the underlying signature is deleted - it prevents usage of the object
///
internal void Invalidate()
{
_invalid = true;
}
//-----------------------------------------------------
//
// Internal Properties
//
//------------------------------------------------------
///
/// Get certificate part - null if none
///
internal CertificatePart GetCertificatePart()
{
// lazy init
if (_certificatePart == null && !_alreadyLookedForCertPart)
{
PackageRelationshipCollection relationships = SignaturePart.GetRelationshipsByType(
CertificatePart.RelationshipType);
foreach (PackageRelationship relationship in relationships)
{
// don't resolve if external
if (relationship.TargetMode != TargetMode.Internal)
throw new FileFormatException(SR.Get(SRID.PackageSignatureCorruption));
Uri resolvedUri = PackUriHelper.ResolvePartUri(SignaturePart.Uri, relationship.TargetUri);
// don't create if it doesn't exist
if (!_manager.Package.PartExists(resolvedUri))
{
continue;
}
// find the cert
_certificatePart = new CertificatePart(_manager.Package, resolvedUri);
break;
}
_alreadyLookedForCertPart = true;
}
return _certificatePart;
}
internal void SetCertificatePart(CertificatePart certificatePart)
{
Debug.Assert(certificatePart != null, "Logic Error: Not expecting setting certificate part to null on digital signature");
_certificatePart = certificatePart;
}
#endregion
#region Private Methods
//-----------------------------------------------------
//
// Private Methods
//
//-----------------------------------------------------
///
/// ThrowIfInvalidated - check on each access
///
private void ThrowIfInvalidated()
{
if (_invalid)
throw new InvalidOperationException(SR.Get(SRID.SignatureDeleted));
}
#endregion Private Methods
//-----------------------------------------------------
//
// Private Fields
//
//------------------------------------------------------
private PackageDigitalSignatureManager _manager;
private XmlDigitalSignatureProcessor _processor;
private CertificatePart _certificatePart;
private ReadOnlyCollection _signedParts;
private ReadOnlyCollection _signedRelationshipSelectors;
private bool _alreadyLookedForCertPart;
private bool _invalid; // have we been invalidated?
}
}
// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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