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mansign2.cs
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mansign2.cs
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// ==++==
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
// ==--==
//
// mansign.cs
//
using System;
using System.Globalization;
using System.IO;
using System.Security.Cryptography;
using System.Security.Cryptography.Xml;
using System.Security.Cryptography.X509Certificates;
using System.Text;
using System.Xml;
using System.Runtime.InteropServices;
using System.Security.Cryptography.Pkcs;
using Microsoft.Win32;
using _FILETIME = System.Runtime.InteropServices.ComTypes.FILETIME;
using System.Collections;
namespace System.Deployment.Internal.CodeSigning
{
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
internal struct BLOBHEADER
{
internal byte bType;
internal byte bVersion;
internal short reserved;
internal uint aiKeyAlg;
};
internal class ManifestSignedXml2 : SignedXml
{
private bool m_verify = false;
private const string Sha256SignatureMethodUri = @"http://www.w3.org/2000/09/xmldsig#rsa-sha256";
private const string Sha256DigestMethod = @"http://www.w3.org/2000/09/xmldsig#sha256";
internal ManifestSignedXml2()
: base()
{
init();
}
internal ManifestSignedXml2(XmlElement elem)
: base(elem)
{
init();
}
internal ManifestSignedXml2(XmlDocument document)
: base(document)
{
init();
}
internal ManifestSignedXml2(XmlDocument document, bool verify)
: base(document)
{
m_verify = verify;
init();
}
private void init()
{
CryptoConfig.AddAlgorithm(typeof(RSAPKCS1SHA256SignatureDescription),
Sha256SignatureMethodUri);
CryptoConfig.AddAlgorithm(typeof(System.Security.Cryptography.SHA256Cng),
Sha256DigestMethod);
}
private static XmlElement FindIdElement(XmlElement context, string idValue)
{
if (context == null)
return null;
XmlElement idReference = context.SelectSingleNode("//*[@Id=\"" + idValue + "\"]") as XmlElement;
if (idReference != null)
return idReference;
idReference = context.SelectSingleNode("//*[@id=\"" + idValue + "\"]") as XmlElement;
if (idReference != null)
return idReference;
return context.SelectSingleNode("//*[@ID=\"" + idValue + "\"]") as XmlElement;
}
public override XmlElement GetIdElement(XmlDocument document, string idValue)
{
// We only care about Id references inside of the KeyInfo section
if (m_verify)
return base.GetIdElement(document, idValue);
KeyInfo keyInfo = this.KeyInfo;
if (keyInfo.Id != idValue)
return null;
return keyInfo.GetXml();
}
}
internal class SignedCmiManifest2
{
private XmlDocument m_manifestDom = null;
private CmiStrongNameSignerInfo m_strongNameSignerInfo = null;
private CmiAuthenticodeSignerInfo m_authenticodeSignerInfo = null;
private bool m_useSha256;
private const string Sha256SignatureMethodUri = @"http://www.w3.org/2000/09/xmldsig#rsa-sha256";
private const string Sha256DigestMethod = @"http://www.w3.org/2000/09/xmldsig#sha256";
private const string wintrustPolicyFlagsRegPath = "Software\\Microsoft\\Windows\\CurrentVersion\\WinTrust\\Trust Providers\\Software Publishing";
private const string wintrustPolicyFlagsRegName = "State";
private SignedCmiManifest2() { }
internal SignedCmiManifest2(XmlDocument manifestDom, bool useSha256)
{
if (manifestDom == null)
throw new ArgumentNullException("manifestDom");
m_manifestDom = manifestDom;
m_useSha256 = useSha256;
}
internal void Sign(CmiManifestSigner2 signer)
{
Sign(signer, null);
}
internal void Sign(CmiManifestSigner2 signer, string timeStampUrl)
{
// Reset signer infos.
m_strongNameSignerInfo = null;
m_authenticodeSignerInfo = null;
// Signer cannot be null.
if (signer == null || signer.StrongNameKey == null)
{
throw new ArgumentNullException("signer");
}
// Remove existing SN signature.
RemoveExistingSignature(m_manifestDom);
// Replace public key token in assemblyIdentity if requested.
if ((signer.Flag & CmiManifestSignerFlag.DontReplacePublicKeyToken) == 0)
{
ReplacePublicKeyToken(m_manifestDom, signer.StrongNameKey, m_useSha256);
}
// No cert means don't Authenticode sign and timestamp.
XmlDocument licenseDom = null;
if (signer.Certificate != null)
{
// Yes. We will Authenticode sign, so first insert <publisherIdentity />
// element, if necessary.
InsertPublisherIdentity(m_manifestDom, signer.Certificate);
// Now create the license DOM, and then sign it.
licenseDom = CreateLicenseDom(signer, ExtractPrincipalFromManifest(), ComputeHashFromManifest(m_manifestDom, m_useSha256));
AuthenticodeSignLicenseDom(licenseDom, signer, timeStampUrl, m_useSha256);
}
StrongNameSignManifestDom(m_manifestDom, licenseDom, signer, m_useSha256);
}
// throw cryptographic exception for any verification errors.
internal void Verify(CmiManifestVerifyFlags verifyFlags)
{
// Reset signer infos.
m_strongNameSignerInfo = null;
m_authenticodeSignerInfo = null;
XmlNamespaceManager nsm = new XmlNamespaceManager(m_manifestDom.NameTable);
nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl);
XmlElement signatureNode = m_manifestDom.SelectSingleNode("//ds:Signature", nsm) as XmlElement;
if (signatureNode == null)
{
throw new CryptographicException(Win32.TRUST_E_NOSIGNATURE);
}
// Make sure it is indeed SN signature, and it is an enveloped signature.
bool oldFormat = VerifySignatureForm(signatureNode, "StrongNameSignature", nsm);
// It is the DSig we want, now make sure the public key matches the token.
string publicKeyToken = VerifyPublicKeyToken();
// OK. We found the SN signature with matching public key token, so
// instantiate the SN signer info property.
m_strongNameSignerInfo = new CmiStrongNameSignerInfo(Win32.TRUST_E_FAIL, publicKeyToken);
// Now verify the SN signature, and Authenticode license if available.
ManifestSignedXml2 signedXml = new ManifestSignedXml2(m_manifestDom, true);
signedXml.LoadXml(signatureNode);
if (m_useSha256)
{
signedXml.SignedInfo.SignatureMethod = Sha256SignatureMethodUri;
}
AsymmetricAlgorithm key = null;
bool dsigValid = signedXml.CheckSignatureReturningKey(out key);
m_strongNameSignerInfo.PublicKey = key;
if (!dsigValid)
{
m_strongNameSignerInfo.ErrorCode = Win32.TRUST_E_BAD_DIGEST;
throw new CryptographicException(Win32.TRUST_E_BAD_DIGEST);
}
// Verify license as well if requested.
if ((verifyFlags & CmiManifestVerifyFlags.StrongNameOnly) != CmiManifestVerifyFlags.StrongNameOnly)
{
if (m_useSha256)
{
VerifyLicenseNew(verifyFlags, oldFormat);
}
else
{
VerifyLicense(verifyFlags, oldFormat);
}
}
}
internal CmiStrongNameSignerInfo StrongNameSignerInfo
{
get
{
return m_strongNameSignerInfo;
}
}
internal CmiAuthenticodeSignerInfo AuthenticodeSignerInfo
{
get
{
return m_authenticodeSignerInfo;
}
}
//
// Privates.
//
private void VerifyLicense(CmiManifestVerifyFlags verifyFlags, bool oldFormat)
{
XmlNamespaceManager nsm = new XmlNamespaceManager(m_manifestDom.NameTable);
nsm.AddNamespace("asm", AssemblyNamespaceUri);
nsm.AddNamespace("asm2", AssemblyV2NamespaceUri);
nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl);
nsm.AddNamespace("msrel", MSRelNamespaceUri);
nsm.AddNamespace("r", LicenseNamespaceUri);
nsm.AddNamespace("as", AuthenticodeNamespaceUri);
// We are done if no license.
XmlElement licenseNode = m_manifestDom.SelectSingleNode("asm:assembly/ds:Signature/ds:KeyInfo/msrel:RelData/r:license", nsm) as XmlElement;
if (licenseNode == null)
{
return;
}
// Make sure this license is for this manifest.
VerifyAssemblyIdentity(nsm);
// Found a license, so instantiate signer info property.
m_authenticodeSignerInfo = new CmiAuthenticodeSignerInfo(Win32.TRUST_E_FAIL);
unsafe
{
byte[] licenseXml = Encoding.UTF8.GetBytes(licenseNode.OuterXml);
fixed (byte* pbLicense = licenseXml)
{
Win32.AXL_SIGNER_INFO signerInfo = new Win32.AXL_SIGNER_INFO();
signerInfo.cbSize = (uint)Marshal.SizeOf(typeof(Win32.AXL_SIGNER_INFO));
Win32.AXL_TIMESTAMPER_INFO timestamperInfo = new Win32.AXL_TIMESTAMPER_INFO();
timestamperInfo.cbSize = (uint)Marshal.SizeOf(typeof(Win32.AXL_TIMESTAMPER_INFO));
Win32.CRYPT_DATA_BLOB licenseBlob = new Win32.CRYPT_DATA_BLOB();
IntPtr pvLicense = new IntPtr(pbLicense);
licenseBlob.cbData = (uint)licenseXml.Length;
licenseBlob.pbData = pvLicense;
int hr = Win32.CertVerifyAuthenticodeLicense(ref licenseBlob, (uint)verifyFlags, ref signerInfo, ref timestamperInfo);
if (Win32.TRUST_E_NOSIGNATURE != (int)signerInfo.dwError)
{
m_authenticodeSignerInfo = new CmiAuthenticodeSignerInfo(signerInfo, timestamperInfo);
}
Win32.CertFreeAuthenticodeSignerInfo(ref signerInfo);
Win32.CertFreeAuthenticodeTimestamperInfo(ref timestamperInfo);
if (hr != Win32.S_OK)
{
throw new CryptographicException(hr);
}
}
}
#if (true) //
if (!oldFormat)
#endif
// Make sure we have the intended Authenticode signer.
VerifyPublisherIdentity(nsm);
}
// can be used with sha1 or sha2
// logic is copied from the "isolation library" in NDP\iso_whid\ds\security\cryptoapi\pkisign\msaxlapi\mansign.cpp
private void VerifyLicenseNew(CmiManifestVerifyFlags verifyFlags, bool oldFormat)
{
XmlNamespaceManager nsm = new XmlNamespaceManager(m_manifestDom.NameTable);
nsm.AddNamespace("asm", AssemblyNamespaceUri);
nsm.AddNamespace("asm2", AssemblyV2NamespaceUri);
nsm.AddNamespace("ds", SignedXml.XmlDsigNamespaceUrl);
nsm.AddNamespace("msrel", MSRelNamespaceUri);
nsm.AddNamespace("r", LicenseNamespaceUri);
nsm.AddNamespace("as", AuthenticodeNamespaceUri);
// We are done if no license.
XmlElement licenseNode = m_manifestDom.SelectSingleNode("asm:assembly/ds:Signature/ds:KeyInfo/msrel:RelData/r:license", nsm) as XmlElement;
if (licenseNode == null)
{
return;
}
// Make sure this license is for this manifest.
VerifyAssemblyIdentity(nsm);
// Found a license, so instantiate signer info property.
m_authenticodeSignerInfo = new CmiAuthenticodeSignerInfo(Win32.TRUST_E_FAIL);
// Find the license's signature
XmlElement signatureNode = licenseNode.SelectSingleNode("//r:issuer/ds:Signature", nsm) as XmlElement;
if (signatureNode == null)
{
throw new CryptographicException(Win32.TRUST_E_NOSIGNATURE);
}
// Make sure it is indeed an Authenticode signature, and it is an enveloped signature.
// Then make sure the transforms are valid.
VerifySignatureForm(signatureNode, "AuthenticodeSignature", nsm);
// Now read the enveloped license signature.
XmlDocument licenseDom = new XmlDocument();
licenseDom.LoadXml(licenseNode.OuterXml);
signatureNode = licenseDom.SelectSingleNode("//r:issuer/ds:Signature", nsm) as XmlElement;
ManifestSignedXml2 signedXml = new ManifestSignedXml2(licenseDom);
signedXml.LoadXml(signatureNode);
if (m_useSha256)
{
signedXml.SignedInfo.SignatureMethod = Sha256SignatureMethodUri;
}
// Check the signature
if (!signedXml.CheckSignature())
{
m_authenticodeSignerInfo = null;
throw new CryptographicException(Win32.TRUST_E_CERT_SIGNATURE);
}
X509Certificate2 signingCertificate = GetSigningCertificate(signedXml, nsm);
// First make sure certificate is not explicitly disallowed.
X509Store store = new X509Store(StoreName.Disallowed, StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
X509Certificate2Collection storedCertificates = null;
try
{
storedCertificates = (X509Certificate2Collection)store.Certificates;
if (storedCertificates == null)
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_FAIL;
throw new CryptographicException(Win32.TRUST_E_FAIL);
}
if (storedCertificates.Contains(signingCertificate))
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_EXPLICIT_DISTRUST;
throw new CryptographicException(Win32.TRUST_E_EXPLICIT_DISTRUST);
}
}
finally
{
store.Close();
}
// prepare information for the TrustManager to display
string hash;
string description;
string url;
if (!GetManifestInformation(licenseNode, nsm, out hash, out description, out url))
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_SUBJECT_FORM_UNKNOWN;
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
m_authenticodeSignerInfo.Hash = hash;
m_authenticodeSignerInfo.Description = description;
m_authenticodeSignerInfo.DescriptionUrl = url;
// read the timestamp from the manifest
DateTime verificationTime;
bool isTimestamped = VerifySignatureTimestamp(signatureNode, nsm, out verificationTime);
bool isLifetimeSigning = false;
if (isTimestamped)
{
isLifetimeSigning = ((verifyFlags & CmiManifestVerifyFlags.LifetimeSigning) == CmiManifestVerifyFlags.LifetimeSigning);
if (!isLifetimeSigning)
{
isLifetimeSigning = GetLifetimeSigning(signingCertificate);
}
}
// Retrieve the Authenticode policy settings from registry.
uint policies = GetAuthenticodePolicies();
X509Chain chain = new X509Chain(); // use the current user profile
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.ExcludeRoot;
chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;
if ((CmiManifestVerifyFlags.RevocationCheckEndCertOnly & verifyFlags) == CmiManifestVerifyFlags.RevocationCheckEndCertOnly)
{
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EndCertificateOnly;
}
else if ((CmiManifestVerifyFlags.RevocationCheckEntireChain & verifyFlags) == CmiManifestVerifyFlags.RevocationCheckEntireChain)
{
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain;
}
else if (((CmiManifestVerifyFlags.RevocationNoCheck & verifyFlags) == CmiManifestVerifyFlags.RevocationNoCheck) ||
((Win32.WTPF_IGNOREREVOKATION & policies) == Win32.WTPF_IGNOREREVOKATION))
{
chain.ChainPolicy.RevocationMode = X509RevocationMode.NoCheck;
}
chain.ChainPolicy.VerificationTime = verificationTime; // local time
if (isTimestamped && isLifetimeSigning)
{
chain.ChainPolicy.ApplicationPolicy.Add(new Oid(Win32.szOID_KP_LIFETIME_SIGNING));
}
chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan(0, 1, 0);
chain.ChainPolicy.VerificationFlags = X509VerificationFlags.NoFlag; // don't ignore anything
bool chainIsValid = chain.Build(signingCertificate);
if (!chainIsValid)
{
#if DEBUG
X509ChainStatus[] statuses = chain.ChainStatus;
foreach (X509ChainStatus status in statuses)
{
System.Diagnostics.Debug.WriteLine("flag = " + status.Status + " " + status.StatusInformation);
}
#endif
AuthenticodeSignerInfo.ErrorCode = Win32.TRUST_E_SUBJECT_NOT_TRUSTED;
throw new CryptographicException(Win32.TRUST_E_SUBJECT_NOT_TRUSTED);
}
// package information for the trust manager
m_authenticodeSignerInfo.SignerChain = chain;
store = new X509Store(StoreName.TrustedPublisher, StoreLocation.CurrentUser);
store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
try
{
storedCertificates = (X509Certificate2Collection)store.Certificates;
if (storedCertificates == null)
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_FAIL;
throw new CryptographicException(Win32.TRUST_E_FAIL);
}
if (!storedCertificates.Contains(signingCertificate))
{
AuthenticodeSignerInfo.ErrorCode = Win32.TRUST_E_SUBJECT_NOT_TRUSTED;
throw new CryptographicException(Win32.TRUST_E_SUBJECT_NOT_TRUSTED);
}
}
finally
{
store.Close();
}
// Verify Certificate publisher name
XmlElement subjectNode = licenseNode.SelectSingleNode("r:grant/as:AuthenticodePublisher/as:X509SubjectName", nsm) as XmlElement;
if (subjectNode == null || String.Compare(signingCertificate.Subject, subjectNode.InnerText, StringComparison.Ordinal) != 0)
{
AuthenticodeSignerInfo.ErrorCode = Win32.TRUST_E_CERT_SIGNATURE;
throw new CryptographicException(Win32.TRUST_E_CERT_SIGNATURE);
}
#if (true) //
if (!oldFormat)
#endif
// Make sure we have the intended Authenticode signer.
VerifyPublisherIdentity(nsm);
}
private X509Certificate2 GetSigningCertificate(ManifestSignedXml2 signedXml, XmlNamespaceManager nsm)
{
X509Certificate2 signingCertificate = null;
KeyInfo keyInfo = signedXml.KeyInfo;
KeyInfoX509Data kiX509 = null;
RSAKeyValue keyValue = null;
foreach (KeyInfoClause kic in keyInfo)
{
if (keyValue == null)
{
keyValue = kic as RSAKeyValue;
if (keyValue == null)
{
break;
}
}
if (kiX509 == null)
{
kiX509 = kic as KeyInfoX509Data;
}
if (keyValue != null && kiX509 != null)
{
break;
}
}
if (keyValue == null || kiX509 == null)
{
// no X509Certificate KeyInfoClause
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_SUBJECT_FORM_UNKNOWN;
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
// get public key from signing keyInfo
RSAParameters signingPublicKey;
RSA rsaProvider = keyValue.Key;
if (rsaProvider != null)
{
signingPublicKey = rsaProvider.ExportParameters(false);
}
else
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_CERT_SIGNATURE;
throw new CryptographicException(Win32.TRUST_E_CERT_SIGNATURE);
}
// enumerate all certificates in x509Data searching for the one whose public key is used in <RSAKeyValue>
foreach (X509Certificate2 certificate in kiX509.Certificates)
{
if (certificate == null)
{
continue;
}
bool certificateAuthority = false;
foreach (X509Extension extention in certificate.Extensions)
{
X509BasicConstraintsExtension basicExtention = extention as X509BasicConstraintsExtension;
if (basicExtention != null)
{
certificateAuthority = basicExtention.CertificateAuthority;
if (certificateAuthority)
{
break;
}
}
}
if (certificateAuthority)
{
// Ignore certs that have "Subject Type=CA" in basic contraints
continue;
}
RSA publicKey = CngLightup.GetRSAPublicKey(certificate);
RSAParameters certificatePublicKey = publicKey.ExportParameters(false);
if ((StructuralComparisons.StructuralEqualityComparer.Equals(signingPublicKey.Exponent, certificatePublicKey.Exponent))
&& (StructuralComparisons.StructuralEqualityComparer.Equals(signingPublicKey.Modulus, certificatePublicKey.Modulus)))
{
signingCertificate = certificate;
break;
}
}
if (signingCertificate == null)
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_CERT_SIGNATURE;
throw new CryptographicException(Win32.TRUST_E_CERT_SIGNATURE);
}
return signingCertificate;
}
private bool VerifySignatureForm(XmlElement signatureNode, string signatureKind, XmlNamespaceManager nsm)
{
bool oldFormat = false;
string snIdName = "Id";
if (!signatureNode.HasAttribute(snIdName))
{
snIdName = "id";
if (!signatureNode.HasAttribute(snIdName))
{
snIdName = "ID";
if (!signatureNode.HasAttribute(snIdName))
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
}
}
string snIdValue = signatureNode.GetAttribute(snIdName);
if (snIdValue == null ||
String.Compare(snIdValue, signatureKind, StringComparison.Ordinal) != 0)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
// Make sure it is indeed an enveloped signature.
bool validFormat = false;
XmlNodeList referenceNodes = signatureNode.SelectNodes("ds:SignedInfo/ds:Reference", nsm);
foreach (XmlNode referenceNode in referenceNodes)
{
XmlElement reference = referenceNode as XmlElement;
if (reference != null && reference.HasAttribute("URI"))
{
string uriValue = reference.GetAttribute("URI");
if (uriValue != null)
{
// We expect URI="" (empty URI value which means to hash the entire document).
if (uriValue.Length == 0)
{
XmlNode transformsNode = reference.SelectSingleNode("ds:Transforms", nsm);
if (transformsNode == null)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
// Make sure the transforms are what we expected.
XmlNodeList transforms = transformsNode.SelectNodes("ds:Transform", nsm);
if (transforms.Count < 2)
{
// We expect at least:
// <Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
// <Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature" />
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
bool c14 = false;
bool enveloped = false;
for (int i = 0; i < transforms.Count; i++)
{
XmlElement transform = transforms[i] as XmlElement;
string algorithm = transform.GetAttribute("Algorithm");
if (algorithm == null)
{
break;
}
else if (String.Compare(algorithm, SignedXml.XmlDsigExcC14NTransformUrl, StringComparison.Ordinal) != 0)
{
c14 = true;
if (enveloped)
{
validFormat = true;
break;
}
}
else if (String.Compare(algorithm, SignedXml.XmlDsigEnvelopedSignatureTransformUrl, StringComparison.Ordinal) != 0)
{
enveloped = true;
if (c14)
{
validFormat = true;
break;
}
}
}
}
#if (true) //
else if (String.Compare(uriValue, "#StrongNameKeyInfo", StringComparison.Ordinal) == 0)
{
oldFormat = true;
XmlNode transformsNode = referenceNode.SelectSingleNode("ds:Transforms", nsm);
if (transformsNode == null)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
// Make sure the transforms are what we expected.
XmlNodeList transforms = transformsNode.SelectNodes("ds:Transform", nsm);
if (transforms.Count < 1)
{
// We expect at least:
// <Transform Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#" />
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
for (int i = 0; i < transforms.Count; i++)
{
XmlElement transform = transforms[i] as XmlElement;
string algorithm = transform.GetAttribute("Algorithm");
if (algorithm == null)
{
break;
}
else if (String.Compare(algorithm, SignedXml.XmlDsigExcC14NTransformUrl, StringComparison.Ordinal) != 0)
{
validFormat = true;
break;
}
}
}
#endif //
}
}
}
if (!validFormat)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
return oldFormat;
}
private bool GetManifestInformation(XmlElement licenseNode, XmlNamespaceManager nsm, out string hash, out string description, out string url)
{
hash = "";
description = "";
url = "";
XmlElement manifestInformation = licenseNode.SelectSingleNode("r:grant/as:ManifestInformation", nsm) as XmlElement;
if (manifestInformation == null)
{
return false;
}
if (!manifestInformation.HasAttribute("Hash"))
{
return false;
}
hash = manifestInformation.GetAttribute("Hash");
if (string.IsNullOrEmpty(hash))
{
return false;
}
foreach (char c in hash)
{
if (0xFF == HexToByte(c))
{
return false;
}
}
if (manifestInformation.HasAttribute("Description"))
{
description = manifestInformation.GetAttribute("Description");
}
if (manifestInformation.HasAttribute("Url"))
{
url = manifestInformation.GetAttribute("Url");
}
return true;
}
private bool VerifySignatureTimestamp(XmlElement signatureNode, XmlNamespaceManager nsm, out DateTime verificationTime)
{
verificationTime = DateTime.Now;
XmlElement node = signatureNode.SelectSingleNode("ds:Object/as:Timestamp", nsm) as XmlElement;
if (node != null)
{
string encodedMessage = node.InnerText;
if (!string.IsNullOrEmpty(encodedMessage))
{
byte[] base64DecodedMessage = null;
try
{
base64DecodedMessage = Convert.FromBase64String(encodedMessage);
}
catch (FormatException)
{
m_authenticodeSignerInfo.ErrorCode = Win32.TRUST_E_TIME_STAMP;
throw new CryptographicException(Win32.TRUST_E_TIME_STAMP);
}
if (base64DecodedMessage != null)
{
// Create a new, nondetached SignedCms message.
SignedCms signedCms = new SignedCms();
signedCms.Decode(base64DecodedMessage);
// Verify the signature without validating the
// certificate.
signedCms.CheckSignature(true);
byte[] signingTime = null;
CryptographicAttributeObjectCollection caos = signedCms.SignerInfos[0].SignedAttributes;
foreach (CryptographicAttributeObject cao in caos)
{
if (0 == string.Compare(cao.Oid.Value, Win32.szOID_RSA_signingTime, StringComparison.Ordinal))
{
foreach (AsnEncodedData d in cao.Values)
{
if (0 == string.Compare(d.Oid.Value, Win32.szOID_RSA_signingTime, StringComparison.Ordinal))
{
signingTime = d.RawData;
Pkcs9SigningTime time = new Pkcs9SigningTime(signingTime);
verificationTime = time.SigningTime;
return true;
}
}
}
}
}
}
}
return false;
}
private bool GetLifetimeSigning(X509Certificate2 signingCertificate)
{
foreach (X509Extension extension in signingCertificate.Extensions)
{
X509EnhancedKeyUsageExtension ekuExtention = extension as X509EnhancedKeyUsageExtension;
if (ekuExtention != null)
{
OidCollection oids = ekuExtention.EnhancedKeyUsages;
foreach (Oid oid in oids)
{
if (0 == string.Compare(Win32.szOID_KP_LIFETIME_SIGNING, oid.Value, StringComparison.Ordinal))
{
return true;
}
}
}
}
return false;
}
// Retrieve the Authenticode policy settings from registry.
// Isolation library was ignoring missing or inaccessible key/value errors
private uint GetAuthenticodePolicies()
{
uint policies = 0;
try
{
RegistryKey key = Registry.CurrentUser.OpenSubKey(wintrustPolicyFlagsRegPath);
if (key != null)
{
RegistryValueKind kind = key.GetValueKind(wintrustPolicyFlagsRegName);
if (kind == RegistryValueKind.DWord || kind == RegistryValueKind.Binary)
{
object value = key.GetValue(wintrustPolicyFlagsRegName);
if (value != null)
{
policies = Convert.ToUInt32(value);
}
}
key.Close();
}
}
catch (System.Security.SecurityException)
{
}
catch (ObjectDisposedException)
{
}
catch (UnauthorizedAccessException)
{
}
catch (IOException)
{
}
return policies;
}
private XmlElement ExtractPrincipalFromManifest()
{
XmlNamespaceManager nsm = new XmlNamespaceManager(m_manifestDom.NameTable);
nsm.AddNamespace("asm", AssemblyNamespaceUri);
XmlNode assemblyIdentityNode = m_manifestDom.SelectSingleNode("asm:assembly/asm:assemblyIdentity", nsm);
if (assemblyIdentityNode == null)
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
return assemblyIdentityNode as XmlElement;
}
private void VerifyAssemblyIdentity(XmlNamespaceManager nsm)
{
XmlElement assemblyIdentity = m_manifestDom.SelectSingleNode("asm:assembly/asm:assemblyIdentity", nsm) as XmlElement;
XmlElement principal = m_manifestDom.SelectSingleNode("asm:assembly/ds:Signature/ds:KeyInfo/msrel:RelData/r:license/r:grant/as:ManifestInformation/as:assemblyIdentity", nsm) as XmlElement;
if (assemblyIdentity == null || principal == null ||
!assemblyIdentity.HasAttributes || !principal.HasAttributes)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
XmlAttributeCollection asmIdAttrs = assemblyIdentity.Attributes;
if (asmIdAttrs.Count == 0 || asmIdAttrs.Count != principal.Attributes.Count)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
foreach (XmlAttribute asmIdAttr in asmIdAttrs)
{
if (!principal.HasAttribute(asmIdAttr.LocalName) ||
asmIdAttr.Value != principal.GetAttribute(asmIdAttr.LocalName))
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
}
VerifyHash(nsm);
}
private void VerifyPublisherIdentity(XmlNamespaceManager nsm)
{
// Nothing to do if no signature.
if (m_authenticodeSignerInfo.ErrorCode == Win32.TRUST_E_NOSIGNATURE)
{
return;
}
X509Certificate2 signerCert = m_authenticodeSignerInfo.SignerChain.ChainElements[0].Certificate;
// Find the publisherIdentity element.
XmlElement publisherIdentity = m_manifestDom.SelectSingleNode("asm:assembly/asm2:publisherIdentity", nsm) as XmlElement;
if (publisherIdentity == null || !publisherIdentity.HasAttributes)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
// Get name and issuerKeyHash attribute values.
if (!publisherIdentity.HasAttribute("name") || !publisherIdentity.HasAttribute("issuerKeyHash"))
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
string publisherName = publisherIdentity.GetAttribute("name");
string publisherIssuerKeyHash = publisherIdentity.GetAttribute("issuerKeyHash");
// Calculate the issuer key hash.
IntPtr pIssuerKeyHash = new IntPtr();
int hr = Win32._AxlGetIssuerPublicKeyHash(signerCert.Handle, ref pIssuerKeyHash);
if (hr != Win32.S_OK)
{
throw new CryptographicException(hr);
}
string issuerKeyHash = Marshal.PtrToStringUni(pIssuerKeyHash);
Win32.HeapFree(Win32.GetProcessHeap(), 0, pIssuerKeyHash);
// Make sure name and issuerKeyHash match.
if (String.Compare(publisherName, signerCert.SubjectName.Name, StringComparison.Ordinal) != 0 ||
String.Compare(publisherIssuerKeyHash, issuerKeyHash, StringComparison.Ordinal) != 0)
{
throw new CryptographicException(Win32.TRUST_E_FAIL);
}
}
private void VerifyHash(XmlNamespaceManager nsm)
{
XmlDocument manifestDom = new XmlDocument();
// We always preserve white space as Fusion XML engine always preserve white space.
manifestDom.PreserveWhitespace = true;
manifestDom = (XmlDocument)m_manifestDom.Clone();
XmlElement manifestInformation = manifestDom.SelectSingleNode("asm:assembly/ds:Signature/ds:KeyInfo/msrel:RelData/r:license/r:grant/as:ManifestInformation", nsm) as XmlElement;
if (manifestInformation == null)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
if (!manifestInformation.HasAttribute("Hash"))
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
string hash = manifestInformation.GetAttribute("Hash");
if (hash == null || hash.Length == 0)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
// Now compute the hash for the manifest without the entire SN
// signature element.
// First remove the Signture element from the DOM.
XmlElement dsElement = manifestDom.SelectSingleNode("asm:assembly/ds:Signature", nsm) as XmlElement;
if (dsElement == null)
{
throw new CryptographicException(Win32.TRUST_E_SUBJECT_FORM_UNKNOWN);
}
dsElement.ParentNode.RemoveChild(dsElement);
// Now compute the hash from the manifest, without the Signature element.
byte[] hashBytes = HexStringToBytes(manifestInformation.GetAttribute("Hash"));
byte[] computedHashBytes = ComputeHashFromManifest(manifestDom, m_useSha256);
// Do they match?