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jellyfin/MediaBrowser.Server.Mono/Security/X509Certificate.cs

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//
// X509Certificates.cs: Handles X.509 certificates.
//
// Author:
// Sebastien Pouliot <sebastien@xamarin.com>
//
// (C) 2002, 2003 Motus Technologies Inc. (http://www.motus.com)
// Copyright (C) 2004-2006 Novell, Inc (http://www.novell.com)
// Copyright 2013 Xamarin Inc. (http://www.xamarin.com)
//
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
//
// The above copyright notice and this permission notice shall be
// included in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
using System;
using System.Runtime.Serialization;
using System.Security.Cryptography;
using System.Security.Permissions;
using System.Text;
namespace MediaBrowser.Server.Mono.Security {
// References:
// a. Internet X.509 Public Key Infrastructure Certificate and CRL Profile
// http://www.ietf.org/rfc/rfc3280.txt
// b. ITU ASN.1 standards (free download)
// http://www.itu.int/ITU-T/studygroups/com17/languages/
public class X509Certificate : ISerializable
{
private ASN1 decoder;
private byte[] m_encodedcert;
private DateTime m_from;
private DateTime m_until;
private ASN1 issuer;
private string m_issuername;
private string m_keyalgo;
private byte[] m_keyalgoparams;
private ASN1 subject;
private string m_subject;
private byte[] m_publickey;
private byte[] signature;
private string m_signaturealgo;
private byte[] m_signaturealgoparams;
private byte[] certhash;
private RSA _rsa;
private DSA _dsa;
// from http://msdn.microsoft.com/en-gb/library/ff635835.aspx
private const string OID_DSA = "1.2.840.10040.4.1";
private const string OID_RSA = "1.2.840.113549.1.1.1";
// from http://www.ietf.org/rfc/rfc2459.txt
//
//Certificate ::= SEQUENCE {
// tbsCertificate TBSCertificate,
// signatureAlgorithm AlgorithmIdentifier,
// signature BIT STRING }
//
//TBSCertificate ::= SEQUENCE {
// version [0] Version DEFAULT v1,
// serialNumber CertificateSerialNumber,
// signature AlgorithmIdentifier,
// issuer Name,
// validity Validity,
// subject Name,
// subjectPublicKeyInfo SubjectPublicKeyInfo,
// issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
// -- If present, version shall be v2 or v3
// subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
// -- If present, version shall be v2 or v3
// extensions [3] Extensions OPTIONAL
// -- If present, version shall be v3 -- }
private int version;
private byte[] serialnumber;
private byte[] issuerUniqueID;
private byte[] subjectUniqueID;
private X509ExtensionCollection extensions;
private static string encoding_error = ("Input data cannot be coded as a valid certificate.");
// that's were the real job is!
private void Parse (byte[] data)
{
try {
decoder = new ASN1 (data);
// Certificate
if (decoder.Tag != 0x30)
throw new CryptographicException (encoding_error);
// Certificate / TBSCertificate
if (decoder [0].Tag != 0x30)
throw new CryptographicException (encoding_error);
ASN1 tbsCertificate = decoder [0];
int tbs = 0;
// Certificate / TBSCertificate / Version
ASN1 v = decoder [0][tbs];
version = 1; // DEFAULT v1
if ((v.Tag == 0xA0) && (v.Count > 0)) {
// version (optional) is present only in v2+ certs
version += v [0].Value [0]; // zero based
tbs++;
}
// Certificate / TBSCertificate / CertificateSerialNumber
ASN1 sn = decoder [0][tbs++];
if (sn.Tag != 0x02)
throw new CryptographicException (encoding_error);
serialnumber = sn.Value;
Array.Reverse (serialnumber, 0, serialnumber.Length);
// Certificate / TBSCertificate / AlgorithmIdentifier
tbs++;
// ASN1 signatureAlgo = tbsCertificate.Element (tbs++, 0x30);
issuer = tbsCertificate.Element (tbs++, 0x30);
m_issuername = X501.ToString (issuer);
ASN1 validity = tbsCertificate.Element (tbs++, 0x30);
ASN1 notBefore = validity [0];
m_from = ASN1Convert.ToDateTime (notBefore);
ASN1 notAfter = validity [1];
m_until = ASN1Convert.ToDateTime (notAfter);
subject = tbsCertificate.Element (tbs++, 0x30);
m_subject = X501.ToString (subject);
ASN1 subjectPublicKeyInfo = tbsCertificate.Element (tbs++, 0x30);
ASN1 algorithm = subjectPublicKeyInfo.Element (0, 0x30);
ASN1 algo = algorithm.Element (0, 0x06);
m_keyalgo = ASN1Convert.ToOid (algo);
// parameters ANY DEFINED BY algorithm OPTIONAL
// so we dont ask for a specific (Element) type and return DER
ASN1 parameters = algorithm [1];
m_keyalgoparams = ((algorithm.Count > 1) ? parameters.GetBytes () : null);
ASN1 subjectPublicKey = subjectPublicKeyInfo.Element (1, 0x03);
// we must drop th first byte (which is the number of unused bits
// in the BITSTRING)
int n = subjectPublicKey.Length - 1;
m_publickey = new byte [n];
Buffer.BlockCopy (subjectPublicKey.Value, 1, m_publickey, 0, n);
// signature processing
byte[] bitstring = decoder [2].Value;
// first byte contains unused bits in first byte
signature = new byte [bitstring.Length - 1];
Buffer.BlockCopy (bitstring, 1, signature, 0, signature.Length);
algorithm = decoder [1];
algo = algorithm.Element (0, 0x06);
m_signaturealgo = ASN1Convert.ToOid (algo);
parameters = algorithm [1];
if (parameters != null)
m_signaturealgoparams = parameters.GetBytes ();
else
m_signaturealgoparams = null;
// Certificate / TBSCertificate / issuerUniqueID
ASN1 issuerUID = tbsCertificate.Element (tbs, 0x81);
if (issuerUID != null) {
tbs++;
issuerUniqueID = issuerUID.Value;
}
// Certificate / TBSCertificate / subjectUniqueID
ASN1 subjectUID = tbsCertificate.Element (tbs, 0x82);
if (subjectUID != null) {
tbs++;
subjectUniqueID = subjectUID.Value;
}
// Certificate / TBSCertificate / Extensions
ASN1 extns = tbsCertificate.Element (tbs, 0xA3);
if ((extns != null) && (extns.Count == 1))
extensions = new X509ExtensionCollection (extns [0]);
else
extensions = new X509ExtensionCollection (null);
// keep a copy of the original data
m_encodedcert = (byte[]) data.Clone ();
}
catch (Exception ex) {
throw new CryptographicException (encoding_error, ex);
}
}
// constructors
public X509Certificate (byte[] data)
{
if (data != null) {
// does it looks like PEM ?
if ((data.Length > 0) && (data [0] != 0x30)) {
try {
data = PEM ("CERTIFICATE", data);
}
catch (Exception ex) {
throw new CryptographicException (encoding_error, ex);
}
}
Parse (data);
}
}
private byte[] GetUnsignedBigInteger (byte[] integer)
{
if (integer [0] == 0x00) {
// this first byte is added so we're sure it's an unsigned integer
// however we can't feed it into RSAParameters or DSAParameters
int length = integer.Length - 1;
byte[] uinteger = new byte [length];
Buffer.BlockCopy (integer, 1, uinteger, 0, length);
return uinteger;
}
else
return integer;
}
// public methods
public DSA DSA {
get {
if (m_keyalgoparams == null)
throw new CryptographicException ("Missing key algorithm parameters.");
if (_dsa == null && m_keyalgo == OID_DSA) {
DSAParameters dsaParams = new DSAParameters ();
// for DSA m_publickey contains 1 ASN.1 integer - Y
ASN1 pubkey = new ASN1 (m_publickey);
if ((pubkey == null) || (pubkey.Tag != 0x02))
return null;
dsaParams.Y = GetUnsignedBigInteger (pubkey.Value);
ASN1 param = new ASN1 (m_keyalgoparams);
if ((param == null) || (param.Tag != 0x30) || (param.Count < 3))
return null;
if ((param [0].Tag != 0x02) || (param [1].Tag != 0x02) || (param [2].Tag != 0x02))
return null;
dsaParams.P = GetUnsignedBigInteger (param [0].Value);
dsaParams.Q = GetUnsignedBigInteger (param [1].Value);
dsaParams.G = GetUnsignedBigInteger (param [2].Value);
// BUG: MS BCL 1.0 can't import a key which
// isn't the same size as the one present in
// the container.
_dsa = (DSA) new DSACryptoServiceProvider (dsaParams.Y.Length << 3);
_dsa.ImportParameters (dsaParams);
}
return _dsa;
}
set {
_dsa = value;
if (value != null)
_rsa = null;
}
}
public X509ExtensionCollection Extensions {
get { return extensions; }
}
public byte[] Hash {
get {
if (certhash == null) {
if ((decoder == null) || (decoder.Count < 1))
return null;
string algo = PKCS1.HashNameFromOid (m_signaturealgo, false);
if (algo == null)
return null;
byte[] toBeSigned = decoder [0].GetBytes ();
using (var hash = PKCS1.CreateFromName (algo))
certhash = hash.ComputeHash (toBeSigned, 0, toBeSigned.Length);
}
return (byte[]) certhash.Clone ();
}
}
public virtual string IssuerName {
get { return m_issuername; }
}
public virtual string KeyAlgorithm {
get { return m_keyalgo; }
}
public virtual byte[] KeyAlgorithmParameters {
get {
if (m_keyalgoparams == null)
return null;
return (byte[]) m_keyalgoparams.Clone ();
}
set { m_keyalgoparams = value; }
}
public virtual byte[] PublicKey {
get {
if (m_publickey == null)
return null;
return (byte[]) m_publickey.Clone ();
}
}
public virtual RSA RSA {
get {
if (_rsa == null && m_keyalgo == OID_RSA) {
RSAParameters rsaParams = new RSAParameters ();
// for RSA m_publickey contains 2 ASN.1 integers
// the modulus and the public exponent
ASN1 pubkey = new ASN1 (m_publickey);
ASN1 modulus = pubkey [0];
if ((modulus == null) || (modulus.Tag != 0x02))
return null;
ASN1 exponent = pubkey [1];
if (exponent.Tag != 0x02)
return null;
rsaParams.Modulus = GetUnsignedBigInteger (modulus.Value);
rsaParams.Exponent = exponent.Value;
// BUG: MS BCL 1.0 can't import a key which
// isn't the same size as the one present in
// the container.
int keySize = (rsaParams.Modulus.Length << 3);
_rsa = (RSA) new RSACryptoServiceProvider (keySize);
_rsa.ImportParameters (rsaParams);
}
return _rsa;
}
set {
if (value != null)
_dsa = null;
_rsa = value;
}
}
public virtual byte[] RawData {
get {
if (m_encodedcert == null)
return null;
return (byte[]) m_encodedcert.Clone ();
}
}
public virtual byte[] SerialNumber {
get {
if (serialnumber == null)
return null;
return (byte[]) serialnumber.Clone ();
}
}
public virtual byte[] Signature {
get {
if (signature == null)
return null;
switch (m_signaturealgo) {
case "1.2.840.113549.1.1.2": // MD2 with RSA encryption
case "1.2.840.113549.1.1.3": // MD4 with RSA encryption
case "1.2.840.113549.1.1.4": // MD5 with RSA encryption
case "1.2.840.113549.1.1.5": // SHA-1 with RSA Encryption
case "1.3.14.3.2.29": // SHA1 with RSA signature
case "1.2.840.113549.1.1.11": // SHA-256 with RSA Encryption
case "1.2.840.113549.1.1.12": // SHA-384 with RSA Encryption
case "1.2.840.113549.1.1.13": // SHA-512 with RSA Encryption
case "1.3.36.3.3.1.2": // RIPEMD160 with RSA Encryption
return (byte[]) signature.Clone ();
case "1.2.840.10040.4.3": // SHA-1 with DSA
ASN1 sign = new ASN1 (signature);
if ((sign == null) || (sign.Count != 2))
return null;
byte[] part1 = sign [0].Value;
byte[] part2 = sign [1].Value;
byte[] sig = new byte [40];
// parts may be less than 20 bytes (i.e. first bytes were 0x00)
// parts may be more than 20 bytes (i.e. first byte > 0x80, negative)
int s1 = System.Math.Max (0, part1.Length - 20);
int e1 = System.Math.Max (0, 20 - part1.Length);
Buffer.BlockCopy (part1, s1, sig, e1, part1.Length - s1);
int s2 = System.Math.Max (0, part2.Length - 20);
int e2 = System.Math.Max (20, 40 - part2.Length);
Buffer.BlockCopy (part2, s2, sig, e2, part2.Length - s2);
return sig;
default:
throw new CryptographicException ("Unsupported hash algorithm: " + m_signaturealgo);
}
}
}
public virtual string SignatureAlgorithm {
get { return m_signaturealgo; }
}
public virtual byte[] SignatureAlgorithmParameters {
get {
if (m_signaturealgoparams == null)
return m_signaturealgoparams;
return (byte[]) m_signaturealgoparams.Clone ();
}
}
public virtual string SubjectName {
get { return m_subject; }
}
public virtual DateTime ValidFrom {
get { return m_from; }
}
public virtual DateTime ValidUntil {
get { return m_until; }
}
public int Version {
get { return version; }
}
public bool IsCurrent {
get { return WasCurrent (DateTime.UtcNow); }
}
public bool WasCurrent (DateTime instant)
{
return ((instant > ValidFrom) && (instant <= ValidUntil));
}
// uncommon v2 "extension"
public byte[] IssuerUniqueIdentifier {
get {
if (issuerUniqueID == null)
return null;
return (byte[]) issuerUniqueID.Clone ();
}
}
// uncommon v2 "extension"
public byte[] SubjectUniqueIdentifier {
get {
if (subjectUniqueID == null)
return null;
return (byte[]) subjectUniqueID.Clone ();
}
}
internal bool VerifySignature (DSA dsa)
{
// signatureOID is check by both this.Hash and this.Signature
DSASignatureDeformatter v = new DSASignatureDeformatter (dsa);
// only SHA-1 is supported
v.SetHashAlgorithm ("SHA1");
return v.VerifySignature (this.Hash, this.Signature);
}
internal bool VerifySignature (RSA rsa)
{
// SHA1-1 with DSA
if (m_signaturealgo == "1.2.840.10040.4.3")
return false;
RSAPKCS1SignatureDeformatter v = new RSAPKCS1SignatureDeformatter (rsa);
v.SetHashAlgorithm (PKCS1.HashNameFromOid (m_signaturealgo));
return v.VerifySignature (this.Hash, this.Signature);
}
public bool VerifySignature (AsymmetricAlgorithm aa)
{
if (aa == null)
throw new ArgumentNullException ("aa");
if (aa is RSA)
return VerifySignature (aa as RSA);
else if (aa is DSA)
return VerifySignature (aa as DSA);
else
throw new NotSupportedException ("Unknown Asymmetric Algorithm " + aa.ToString ());
}
public bool CheckSignature (byte[] hash, string hashAlgorithm, byte[] signature)
{
RSACryptoServiceProvider r = (RSACryptoServiceProvider) RSA;
return r.VerifyHash (hash, hashAlgorithm, signature);
}
public bool IsSelfSigned {
get {
if (m_issuername != m_subject)
return false;
try {
if (RSA != null)
return VerifySignature (RSA);
else if (DSA != null)
return VerifySignature (DSA);
else
return false; // e.g. a certificate with only DSA parameters
}
catch (CryptographicException) {
return false;
}
}
}
public ASN1 GetIssuerName ()
{
return issuer;
}
public ASN1 GetSubjectName ()
{
return subject;
}
protected X509Certificate (SerializationInfo info, StreamingContext context)
{
Parse ((byte[]) info.GetValue ("raw", typeof (byte[])));
}
[SecurityPermission (SecurityAction.Demand, SerializationFormatter = true)]
public virtual void GetObjectData (SerializationInfo info, StreamingContext context)
{
info.AddValue ("raw", m_encodedcert);
// note: we NEVER serialize the private key
}
static byte[] PEM (string type, byte[] data)
{
string pem = Encoding.ASCII.GetString (data);
string header = String.Format ("-----BEGIN {0}-----", type);
string footer = String.Format ("-----END {0}-----", type);
int start = pem.IndexOf (header) + header.Length;
int end = pem.IndexOf (footer, start);
string base64 = pem.Substring (start, (end - start));
return Convert.FromBase64String (base64);
}
}
}