internal static string FindHttpAiaRecord(byte[] authorityInformationAccess, string recordTypeOid)
{
DerSequenceReader reader = new DerSequenceReader(authorityInformationAccess);
while (reader.HasData)
{
DerSequenceReader innerReader = reader.ReadSequence();
// If the sequence's first element is a sequence, unwrap it.
if (innerReader.PeekTag() == ConstructedSequenceTagId)
{
innerReader = innerReader.ReadSequence();
}
Oid oid = innerReader.ReadOid();
if (StringComparer.Ordinal.Equals(oid.Value, recordTypeOid))
{
string uri = innerReader.ReadIA5String();
Uri parsedUri;
if (!Uri.TryCreate(uri, UriKind.Absolute, out parsedUri))
{
continue;
}
if (!StringComparer.Ordinal.Equals(parsedUri.Scheme, "http"))
{
continue;
}
return(uri);
}
}
return(null);
}
private static int ReadInhibitAnyPolicyExtension(X509Extension extension)
{
DerSequenceReader reader = DerSequenceReader.CreateForPayload(extension.RawData);
return(reader.ReadInteger());
}
internal CertificateData(byte[] rawData)
{
#if DEBUG
try
{
#endif
DerSequenceReader reader = new DerSequenceReader(rawData);
DerSequenceReader tbsCertificate = reader.ReadSequence();
if (tbsCertificate.PeekTag() == DerSequenceReader.ContextSpecificConstructedTag0)
{
DerSequenceReader version = tbsCertificate.ReadSequence();
Version = version.ReadInteger();
}
else if (tbsCertificate.PeekTag() != (byte)DerSequenceReader.DerTag.Integer)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
else
{
Version = 0;
}
if (Version < 0 || Version > 2)
{
throw new CryptographicException();
}
SerialNumber = tbsCertificate.ReadIntegerBytes();
DerSequenceReader tbsSignature = tbsCertificate.ReadSequence();
TbsSignature.AlgorithmId = tbsSignature.ReadOidAsString();
TbsSignature.Parameters = tbsSignature.HasData ? tbsSignature.ReadNextEncodedValue() : Array.Empty <byte>();
if (tbsSignature.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
Issuer = new X500DistinguishedName(tbsCertificate.ReadNextEncodedValue());
DerSequenceReader validity = tbsCertificate.ReadSequence();
NotBefore = validity.ReadX509Date();
NotAfter = validity.ReadX509Date();
if (validity.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
Subject = new X500DistinguishedName(tbsCertificate.ReadNextEncodedValue());
SubjectPublicKeyInfo = tbsCertificate.ReadNextEncodedValue();
DerSequenceReader subjectPublicKeyInfo = new DerSequenceReader(SubjectPublicKeyInfo);
DerSequenceReader subjectKeyAlgorithm = subjectPublicKeyInfo.ReadSequence();
PublicKeyAlgorithm.AlgorithmId = subjectKeyAlgorithm.ReadOidAsString();
PublicKeyAlgorithm.Parameters = subjectKeyAlgorithm.HasData ? subjectKeyAlgorithm.ReadNextEncodedValue() : Array.Empty <byte>();
if (subjectKeyAlgorithm.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
PublicKey = subjectPublicKeyInfo.ReadBitString();
if (subjectPublicKeyInfo.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
if (Version > 0 &&
tbsCertificate.HasData &&
tbsCertificate.PeekTag() == DerSequenceReader.ContextSpecificConstructedTag1)
{
IssuerUniqueId = tbsCertificate.ReadBitString();
}
else
{
IssuerUniqueId = null;
}
if (Version > 0 &&
tbsCertificate.HasData &&
tbsCertificate.PeekTag() == DerSequenceReader.ContextSpecificConstructedTag2)
{
SubjectUniqueId = tbsCertificate.ReadBitString();
}
else
{
SubjectUniqueId = null;
}
Extensions = new List <X509Extension>();
if (Version > 1 &&
tbsCertificate.HasData &&
tbsCertificate.PeekTag() == DerSequenceReader.ContextSpecificConstructedTag3)
{
DerSequenceReader extensions = tbsCertificate.ReadSequence();
extensions = extensions.ReadSequence();
while (extensions.HasData)
{
DerSequenceReader extensionReader = extensions.ReadSequence();
string oid = extensionReader.ReadOidAsString();
bool critical = false;
if (extensionReader.PeekTag() == (byte)DerSequenceReader.DerTag.Boolean)
{
critical = extensionReader.ReadBoolean();
}
byte[] extensionData = extensionReader.ReadOctetString();
Extensions.Add(new X509Extension(oid, extensionData, critical));
if (extensionReader.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
}
}
if (tbsCertificate.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
DerSequenceReader signatureAlgorithm = reader.ReadSequence();
SignatureAlgorithm.AlgorithmId = signatureAlgorithm.ReadOidAsString();
SignatureAlgorithm.Parameters = signatureAlgorithm.HasData ? signatureAlgorithm.ReadNextEncodedValue() : Array.Empty <byte>();
if (signatureAlgorithm.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
SignatureValue = reader.ReadBitString();
if (reader.HasData)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
RawData = rawData;
#if DEBUG
}
catch (Exception e)
{
throw new CryptographicException(
$"Error in reading certificate:{Environment.NewLine}{PemPrintCert(rawData)}",
e);
}
#endif
}
private static string FindAltNameMatch(byte[] extensionBytes, GeneralNameType matchType, string otherOid)
{
// If Other, have OID, else, no OID.
Debug.Assert(
(otherOid == null) == (matchType != GeneralNameType.OtherName),
$"otherOid has incorrect nullarity for matchType {matchType}");
Debug.Assert(
matchType == GeneralNameType.UniformResourceIdentifier ||
matchType == GeneralNameType.DnsName ||
matchType == GeneralNameType.Email ||
matchType == GeneralNameType.OtherName,
$"matchType ({matchType}) is not currently supported");
Debug.Assert(
otherOid == null || otherOid == Oids.UserPrincipalName,
$"otherOid ({otherOid}) is not supported");
// SubjectAltName ::= GeneralNames
//
// IssuerAltName ::= GeneralNames
//
// GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
//
// GeneralName ::= CHOICE {
// otherName [0] OtherName,
// rfc822Name [1] IA5String,
// dNSName [2] IA5String,
// x400Address [3] ORAddress,
// directoryName [4] Name,
// ediPartyName [5] EDIPartyName,
// uniformResourceIdentifier [6] IA5String,
// iPAddress [7] OCTET STRING,
// registeredID [8] OBJECT IDENTIFIER }
//
// OtherName::= SEQUENCE {
// type - id OBJECT IDENTIFIER,
// value[0] EXPLICIT ANY DEFINED BY type - id }
byte expectedTag = (byte)(DerSequenceReader.ContextSpecificTagFlag | (byte)matchType);
if (matchType == GeneralNameType.OtherName)
{
expectedTag |= DerSequenceReader.ConstructedFlag;
}
DerSequenceReader altNameReader = new DerSequenceReader(extensionBytes);
while (altNameReader.HasData)
{
if (altNameReader.PeekTag() != expectedTag)
{
altNameReader.SkipValue();
continue;
}
switch (matchType)
{
case GeneralNameType.OtherName:
{
DerSequenceReader otherNameReader = altNameReader.ReadSequence();
string oid = otherNameReader.ReadOidAsString();
if (oid == otherOid)
{
// Payload is value[0] EXPLICIT, meaning
// a) it'll be tagged as ContextSpecific0
// b) that's interpretable as a Sequence (EXPLICIT)
// c) the payload will then be retagged as the correct type (EXPLICIT)
if (otherNameReader.PeekTag() != DerSequenceReader.ContextSpecificConstructedTag0)
{
throw new CryptographicException(SR.Cryptography_Der_Invalid_Encoding);
}
otherNameReader = otherNameReader.ReadSequence();
// Currently only UPN is supported, which is a UTF8 string per
// https://msdn.microsoft.com/en-us/library/ff842518.aspx
return(otherNameReader.ReadUtf8String());
}
// If the OtherName OID didn't match, move to the next entry.
continue;
}
case GeneralNameType.Rfc822Name:
case GeneralNameType.DnsName:
case GeneralNameType.UniformResourceIdentifier:
return(altNameReader.ReadIA5String());
default:
altNameReader.SkipValue();
continue;
}
}
return(null);
}
private static string GetCdpUrl(X509Certificate2 cert)
{
byte[] crlDistributionPoints = null;
foreach (X509Extension extension in cert.Extensions)
{
if (StringComparer.Ordinal.Equals(extension.Oid.Value, Oids.CrlDistributionPoints))
{
// If there's an Authority Information Access extension, it might be used for
// looking up additional certificates for the chain.
crlDistributionPoints = extension.RawData;
break;
}
}
if (crlDistributionPoints == null)
{
return null;
}
// CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
//
// DistributionPoint ::= SEQUENCE {
// distributionPoint [0] DistributionPointName OPTIONAL,
// reasons [1] ReasonFlags OPTIONAL,
// cRLIssuer [2] GeneralNames OPTIONAL }
//
// DistributionPointName ::= CHOICE {
// fullName [0] GeneralNames,
// nameRelativeToCRLIssuer [1] RelativeDistinguishedName }
//
// GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
//
// GeneralName ::= CHOICE {
// otherName [0] OtherName,
// rfc822Name [1] IA5String,
// dNSName [2] IA5String,
// x400Address [3] ORAddress,
// directoryName [4] Name,
// ediPartyName [5] EDIPartyName,
// uniformResourceIdentifier [6] IA5String,
// iPAddress [7] OCTET STRING,
// registeredID [8] OBJECT IDENTIFIER }
DerSequenceReader cdpSequence = new DerSequenceReader(crlDistributionPoints);
while (cdpSequence.HasData)
{
const byte ContextSpecificFlag = 0x80;
const byte ContextSpecific0 = ContextSpecificFlag;
const byte ConstructedFlag = 0x20;
const byte ContextSpecificConstructed0 = ContextSpecific0 | ConstructedFlag;
const byte GeneralNameUri = ContextSpecificFlag | 0x06;
DerSequenceReader distributionPointReader = cdpSequence.ReadSequence();
byte tag = distributionPointReader.PeekTag();
// Only distributionPoint is supported
if (tag != ContextSpecificConstructed0)
{
continue;
}
// The DistributionPointName is a CHOICE, not a SEQUENCE, but the reader is the same.
DerSequenceReader dpNameReader = distributionPointReader.ReadSequence();
tag = dpNameReader.PeekTag();
// Only fullName is supported,
// nameRelativeToCRLIssuer is for LDAP-based lookup.
if (tag != ContextSpecificConstructed0)
{
continue;
}
DerSequenceReader fullNameReader = dpNameReader.ReadSequence();
while (fullNameReader.HasData)
{
tag = fullNameReader.PeekTag();
if (tag != GeneralNameUri)
{
fullNameReader.SkipValue();
continue;
}
string uri = fullNameReader.ReadIA5String();
Uri parsedUri = new Uri(uri);
if (!StringComparer.Ordinal.Equals(parsedUri.Scheme, "http"))
{
continue;
}
return uri;
}
}
return null;
}
internal static byte[] DecodeX509SubjectKeyIdentifierExtension(byte[] encoded)
{
DerSequenceReader reader = DerSequenceReader.CreateForPayload(encoded);
return(reader.ReadOctetString());
}
private static string X500DistinguishedNameDecode(
byte[] encodedName,
bool printOid,
bool reverse,
bool quoteIfNeeded,
string dnSeparator,
string multiValueSeparator,
bool addTrailingDelimiter)
{
DerSequenceReader x500NameReader = new DerSequenceReader(encodedName);
var rdnReaders = new List <DerSequenceReader>();
while (x500NameReader.HasData)
{
rdnReaders.Add(x500NameReader.ReadSet());
}
// We need to allocate a StringBuilder to hold the data as we're building it, and there's the usual
// arbitrary process of choosing a number that's "big enough" to minimize reallocations without wasting
// too much space in the average case.
//
// So, let's look at an example of what our output might be.
//
// GitHub.com's SSL cert has a "pretty long" subject (partially due to the unknown OIDs):
// businessCategory=Private Organization
// 1.3.6.1.4.1.311.60.2.1.3=US
// 1.3.6.1.4.1.311.60.2.1.2=Delaware
// serialNumber=5157550
// street=548 4th Street
// postalCode=94107
// C=US
// ST=California
// L=San Francisco
// O=GitHub, Inc.
// CN=github.com
//
// Which comes out to 228 characters using OpenSSL's default pretty-print
// (openssl x509 -in github.cer -text -noout)
// Throw in some "maybe-I-need-to-quote-this" quotes, and a couple of extra/extra-long O/OU values
// and round that up to the next programmer number, and you get that 512 should avoid reallocations
// in all but the most dire of cases.
StringBuilder decodedName = new StringBuilder(512);
int entryCount = rdnReaders.Count;
bool printSpacing = false;
for (int i = 0; i < entryCount; i++)
{
int loc = reverse ? entryCount - i - 1 : i;
// RelativeDistinguishedName ::=
// SET SIZE (1..MAX) OF AttributeTypeAndValue
//
// AttributeTypeAndValue::= SEQUENCE {
// type AttributeType,
// value AttributeValue }
//
// AttributeType::= OBJECT IDENTIFIER
//
// AttributeValue ::= ANY-- DEFINED BY AttributeType
if (printSpacing)
{
decodedName.Append(dnSeparator);
}
else
{
printSpacing = true;
}
DerSequenceReader rdnReader = rdnReaders[loc];
bool hadValue = false;
while (rdnReader.HasData)
{
DerSequenceReader tavReader = rdnReader.ReadSequence();
if (hadValue)
{
decodedName.Append(multiValueSeparator);
}
else
{
hadValue = true;
}
if (printOid)
{
AppendOid(decodedName, tavReader.ReadOidAsString());
}
else
{
tavReader.SkipValue();
}
string attributeValue = ReadString(tavReader);
bool quote = quoteIfNeeded && NeedsQuoting(attributeValue);
if (quote)
{
decodedName.Append('"');
// If the RDN itself had a quote within it, that quote needs to be escaped
// with another quote.
attributeValue = attributeValue.Replace("\"", "\"\"");
}
decodedName.Append(attributeValue);
if (quote)
{
decodedName.Append('"');
}
}
}
if (addTrailingDelimiter && decodedName.Length > 0)
{
decodedName.Append(dnSeparator);
}
return(decodedName.ToString());
}
private static string GetCdpUrl(X509Certificate2 cert)
{
byte[] crlDistributionPoints = null;
foreach (X509Extension extension in cert.Extensions)
{
if (StringComparer.Ordinal.Equals(extension.Oid.Value, Oids.CrlDistributionPoints))
{
// If there's an Authority Information Access extension, it might be used for
// looking up additional certificates for the chain.
crlDistributionPoints = extension.RawData;
break;
}
}
if (crlDistributionPoints == null)
{
return(null);
}
// CRLDistributionPoints ::= SEQUENCE SIZE (1..MAX) OF DistributionPoint
//
// DistributionPoint ::= SEQUENCE {
// distributionPoint [0] DistributionPointName OPTIONAL,
// reasons [1] ReasonFlags OPTIONAL,
// cRLIssuer [2] GeneralNames OPTIONAL }
//
// DistributionPointName ::= CHOICE {
// fullName [0] GeneralNames,
// nameRelativeToCRLIssuer [1] RelativeDistinguishedName }
//
// GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
//
// GeneralName ::= CHOICE {
// otherName [0] OtherName,
// rfc822Name [1] IA5String,
// dNSName [2] IA5String,
// x400Address [3] ORAddress,
// directoryName [4] Name,
// ediPartyName [5] EDIPartyName,
// uniformResourceIdentifier [6] IA5String,
// iPAddress [7] OCTET STRING,
// registeredID [8] OBJECT IDENTIFIER }
DerSequenceReader cdpSequence = new DerSequenceReader(crlDistributionPoints);
while (cdpSequence.HasData)
{
const byte ContextSpecificFlag = 0x80;
const byte ContextSpecific0 = ContextSpecificFlag;
const byte ConstructedFlag = 0x20;
const byte ContextSpecificConstructed0 = ContextSpecific0 | ConstructedFlag;
const byte GeneralNameUri = ContextSpecificFlag | 0x06;
DerSequenceReader distributionPointReader = cdpSequence.ReadSequence();
byte tag = distributionPointReader.PeekTag();
// Only distributionPoint is supported
if (tag != ContextSpecificConstructed0)
{
continue;
}
// The DistributionPointName is a CHOICE, not a SEQUENCE, but the reader is the same.
DerSequenceReader dpNameReader = distributionPointReader.ReadSequence();
tag = dpNameReader.PeekTag();
// Only fullName is supported,
// nameRelativeToCRLIssuer is for LDAP-based lookup.
if (tag != ContextSpecificConstructed0)
{
continue;
}
DerSequenceReader fullNameReader = dpNameReader.ReadSequence();
while (fullNameReader.HasData)
{
tag = fullNameReader.PeekTag();
if (tag != GeneralNameUri)
{
fullNameReader.SkipValue();
continue;
}
string uri = fullNameReader.ReadIA5String();
Uri parsedUri = new Uri(uri);
if (!StringComparer.Ordinal.Equals(parsedUri.Scheme, "http"))
{
continue;
}
return(uri);
}
}
return(null);
}
