Header GenerateArcMessageSignature(FormatOptions options, MimeMessage message, int instance, TimeSpan t, IList <string> headers)
{
if (message.MimeVersion == null && message.Body != null && message.Body.Headers.Count > 0)
{
message.MimeVersion = new Version(1, 0);
}
var value = CreateArcHeaderBuilder(instance);
byte[] signature, hash;
Header ams;
value.AppendFormat("; d={0}; s={1}", Domain, Selector);
value.AppendFormat("; c={0}/{1}",
HeaderCanonicalizationAlgorithm.ToString().ToLowerInvariant(),
BodyCanonicalizationAlgorithm.ToString().ToLowerInvariant());
value.AppendFormat("; t={0}", (long)t.TotalSeconds);
using (var stream = new DkimSignatureStream(CreateSigningContext())) {
using (var filtered = new FilteredStream(stream)) {
filtered.Add(options.CreateNewLineFilter());
// write the specified message headers
DkimVerifierBase.WriteHeaders(options, message, headers, HeaderCanonicalizationAlgorithm, filtered);
value.AppendFormat("; h={0}", string.Join(":", headers.ToArray()));
hash = message.HashBody(options, SignatureAlgorithm, BodyCanonicalizationAlgorithm, -1);
value.AppendFormat("; bh={0}", Convert.ToBase64String(hash));
value.Append("; b=");
ams = new Header(HeaderId.ArcMessageSignature, value.ToString());
switch (HeaderCanonicalizationAlgorithm)
{
case DkimCanonicalizationAlgorithm.Relaxed:
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, ams, true);
break;
default:
DkimVerifierBase.WriteHeaderSimple(options, filtered, ams, true);
break;
}
filtered.Flush();
}
signature = stream.GenerateSignature();
ams.Value += Convert.ToBase64String(signature);
return(ams);
}
}
Header GenerateArcSeal(FormatOptions options, int instance, TimeSpan t, ArcHeaderSet[] sets, int count, Header aar, Header ams)
{
var value = CreateArcHeaderBuilder(instance);
byte[] signature;
Header seal;
// FIXME: where should this value come from?
value.Append("; cv=pass");
value.AppendFormat("; d={0}; s={1}", Domain, Selector);
value.AppendFormat("; t={0}", (long)t.TotalSeconds);
using (var stream = new DkimSignatureStream(CreateSigningContext())) {
using (var filtered = new FilteredStream(stream)) {
filtered.Add(options.CreateNewLineFilter());
for (int i = 0; i < count; i++)
{
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, sets[i].ArcAuthenticationResult, false);
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, sets[i].ArcMessageSignature, false);
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, sets[i].ArcSeal, false);
}
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, aar, false);
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, ams, false);
value.Append("; b=");
seal = new Header(HeaderId.ArcSeal, value.ToString());
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, seal, true);
filtered.Flush();
}
signature = stream.GenerateSignature();
seal.Value += Convert.ToBase64String(signature);
return(seal);
}
}
/// <summary>
/// Digitally sign the message using a DomainKeys Identified Mail (DKIM) signature.
/// </summary>
/// <remarks>
/// Digitally signs the message using a DomainKeys Identified Mail (DKIM) signature.
/// </remarks>
/// <param name="options">The formatting options.</param>
/// <param name="signer">The DKIM signer.</param>
/// <param name="headers">The list of header fields to sign.</param>
/// <param name="headerCanonicalizationAlgorithm">The header canonicalization algorithm.</param>
/// <param name="bodyCanonicalizationAlgorithm">The body canonicalization algorithm.</param>
/// <exception cref="System.ArgumentNullException">
/// <para><paramref name="options"/> is <c>null</c>.</para>
/// <para>-or-</para>
/// <para><paramref name="signer"/> is <c>null</c>.</para>
/// <para>-or-</para>
/// <para><paramref name="headers"/> is <c>null</c>.</para>
/// </exception>
/// <exception cref="System.ArgumentException">
/// <para><paramref name="headers"/> does not contain the 'From' header.</para>
/// <para>-or-</para>
/// <para><paramref name="headers"/> contains one or more of the following headers: Return-Path,
/// Received, Comments, Keywords, Bcc, Resent-Bcc, or DKIM-Signature.</para>
/// </exception>
void Sign (FormatOptions options, DkimSigner signer, IList<HeaderId> headers, DkimCanonicalizationAlgorithm headerCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Simple, DkimCanonicalizationAlgorithm bodyCanonicalizationAlgorithm = DkimCanonicalizationAlgorithm.Simple)
{
if (options == null)
throw new ArgumentNullException ("options");
if (signer == null)
throw new ArgumentNullException ("signer");
if (headers == null)
throw new ArgumentNullException ("headers");
if (!headers.Contains (HeaderId.From))
throw new ArgumentException ("The list of headers to sign MUST include the 'From' header.");
var fields = new string[headers.Count];
for (int i = 0; i < headers.Count; i++) {
if (DkimShouldNotInclude.Contains (headers[i]))
throw new ArgumentException (string.Format ("The list of headers to sign SHOULD NOT include the '{0}' header.", headers[i].ToHeaderName ()));
fields[i] = headers[i].ToHeaderName ().ToLowerInvariant ();
}
if (version == null && Body != null && Body.Headers.Count > 0)
MimeVersion = new Version (1, 0);
Prepare (EncodingConstraint.SevenBit, 78);
var t = DateTime.Now - DateUtils.UnixEpoch;
var value = new StringBuilder ("v=1");
byte[] signature, hash;
Header dkim;
options = options.Clone ();
options.NewLineFormat = NewLineFormat.Dos;
switch (signer.SignatureAlgorithm) {
case DkimSignatureAlgorithm.RsaSha256:
value.Append ("; a=rsa-sha256");
break;
default:
value.Append ("; a=rsa-sha1");
break;
}
value.AppendFormat ("; d={0}; s={1}", signer.Domain, signer.Selector);
value.AppendFormat ("; c={0}/{1}",
headerCanonicalizationAlgorithm.ToString ().ToLowerInvariant (),
bodyCanonicalizationAlgorithm.ToString ().ToLowerInvariant ());
if (!string.IsNullOrEmpty (signer.QueryMethod))
value.AppendFormat ("; q={0}", signer.QueryMethod);
if (!string.IsNullOrEmpty (signer.AgentOrUserIdentifier))
value.AppendFormat ("; i={0}", signer.AgentOrUserIdentifier);
value.AppendFormat ("; t={0}", (long) t.TotalSeconds);
using (var stream = new DkimSignatureStream (DkimGetDigestSigner (signer.SignatureAlgorithm, signer.PrivateKey))) {
using (var filtered = new FilteredStream (stream)) {
filtered.Add (options.CreateNewLineFilter ());
// write the specified message headers
DkimWriteHeaders (options, fields, headerCanonicalizationAlgorithm, filtered);
value.AppendFormat ("; h={0}", string.Join (":", fields.ToArray ()));
hash = DkimHashBody (options, signer.SignatureAlgorithm, bodyCanonicalizationAlgorithm, -1);
value.AppendFormat ("; bh={0}", Convert.ToBase64String (hash));
value.Append ("; b=");
dkim = new Header (HeaderId.DkimSignature, value.ToString ());
Headers.Insert (0, dkim);
switch (headerCanonicalizationAlgorithm) {
case DkimCanonicalizationAlgorithm.Relaxed:
DkimWriteHeaderRelaxed (options, filtered, dkim);
break;
default:
DkimWriteHeaderSimple (options, filtered, dkim);
break;
}
filtered.Flush ();
}
signature = stream.GenerateSignature ();
dkim.Value += Convert.ToBase64String (signature);
}
}
void DkimSign(FormatOptions options, MimeMessage message, IList <string> headers)
{
var value = new StringBuilder("v=1");
var t = GetTimestamp();
byte[] signature, hash;
Header dkim;
options = options.Clone();
options.NewLineFormat = NewLineFormat.Dos;
options.EnsureNewLine = true;
switch (SignatureAlgorithm)
{
case DkimSignatureAlgorithm.Ed25519Sha256:
value.Append("; a=ed25519-sha256");
break;
case DkimSignatureAlgorithm.RsaSha256:
value.Append("; a=rsa-sha256");
break;
default:
value.Append("; a=rsa-sha1");
break;
}
value.AppendFormat("; d={0}; s={1}", Domain, Selector);
value.AppendFormat("; c={0}/{1}",
HeaderCanonicalizationAlgorithm.ToString().ToLowerInvariant(),
BodyCanonicalizationAlgorithm.ToString().ToLowerInvariant());
if (!string.IsNullOrEmpty(QueryMethod))
{
value.AppendFormat("; q={0}", QueryMethod);
}
if (!string.IsNullOrEmpty(AgentOrUserIdentifier))
{
value.AppendFormat("; i={0}", AgentOrUserIdentifier);
}
value.AppendFormat("; t={0}", t);
using (var stream = new DkimSignatureStream(CreateSigningContext())) {
using (var filtered = new FilteredStream(stream)) {
filtered.Add(options.CreateNewLineFilter());
// write the specified message headers
DkimVerifierBase.WriteHeaders(options, message, headers, HeaderCanonicalizationAlgorithm, filtered);
value.AppendFormat("; h={0}", string.Join(":", headers.ToArray()));
hash = message.HashBody(options, SignatureAlgorithm, BodyCanonicalizationAlgorithm, -1);
value.AppendFormat("; bh={0}", Convert.ToBase64String(hash));
value.Append("; b=");
dkim = new Header(HeaderId.DkimSignature, value.ToString());
message.Headers.Insert(0, dkim);
switch (HeaderCanonicalizationAlgorithm)
{
case DkimCanonicalizationAlgorithm.Relaxed:
DkimVerifierBase.WriteHeaderRelaxed(options, filtered, dkim, true);
break;
default:
DkimVerifierBase.WriteHeaderSimple(options, filtered, dkim, true);
break;
}
filtered.Flush();
}
signature = stream.GenerateSignature();
dkim.Value += Convert.ToBase64String(signature);
}
}
