feat: session B — auth implementation + signals (26 stubs complete)
Implement ConfigureAuthorization, CheckAuthentication, and full auth dispatch in NatsServer.Auth.cs; add HandleSignals in NatsServer.Signals.cs; extend AuthHandler with GetAuthErrClosedState, ValidateProxies, GetTlsAuthDcs, CheckClientTlsCertSubject, ProcessUserPermissionsTemplate; add ReadOperatorJwt/ValidateTrustedOperators to JwtProcessor; add AuthCallout stub; add auth accessor helpers to ClientConnection; add NATS.NKeys package for NKey signature verification; 12 new tests pass.
This commit is contained in:
Joseph Doherty
93
dotnet/src/ZB.MOM.NatsNet.Server/Auth/AuthCallout.cs
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93
dotnet/src/ZB.MOM.NatsNet.Server/Auth/AuthCallout.cs
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// Copyright 2022-2025 The NATS Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//
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// Adapted from server/auth_callout.go in the NATS server Go source.
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namespace ZB.MOM.NatsNet.Server.Auth;
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/// <summary>
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/// External auth callout support.
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/// Mirrors Go <c>auth_callout.go</c>.
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/// </summary>
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internal static class AuthCallout
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{
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/// <summary>
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/// Publishes an auth request to the configured callout account and awaits
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/// a signed JWT response that authorises or rejects the connecting client.
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/// Mirrors Go <c>processClientOrLeafCallout</c> in auth_callout.go.
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/// </summary>
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public static bool ProcessClientOrLeafCallout(NatsServer server, ClientConnection c, ServerOptions opts)
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{
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// Full implementation requires internal NATS pub/sub with async request/reply.
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// This is intentionally left as a stub until the internal NATS connection layer is available.
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throw new NotImplementedException(
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"Auth callout requires internal NATS pub/sub — implement when connection layer is available.");
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}
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/// <summary>
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/// Populates an authorization request payload with client connection info.
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/// Mirrors Go <c>client.fillClientInfo</c> in auth_callout.go.
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/// </summary>
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public static void FillClientInfo(AuthorizationRequest req, ClientConnection c)
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{
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req.ClientInfoObj = new AuthorizationClientInfo
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{
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Host = c.Host,
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Id = c.Cid,
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Kind = c.Kind.ToString().ToLowerInvariant(),
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Type = "client",
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};
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}
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/// <summary>
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/// Populates an authorization request payload with connect options.
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/// Mirrors Go <c>client.fillConnectOpts</c> in auth_callout.go.
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/// </summary>
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public static void FillConnectOpts(AuthorizationRequest req, ClientConnection c)
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{
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req.ConnectOptions = new AuthorizationConnectOpts
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{
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Username = c.GetUsername(),
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Password = c.GetPassword(),
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AuthToken = c.GetAuthToken(),
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Nkey = c.GetNkey(),
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};
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}
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}
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/// <summary>Authorization request sent to auth callout service.</summary>
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public sealed class AuthorizationRequest
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{
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public string ServerId { get; set; } = string.Empty;
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public string UserNkey { get; set; } = string.Empty;
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public AuthorizationClientInfo? ClientInfoObj { get; set; }
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public AuthorizationConnectOpts? ConnectOptions { get; set; }
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}
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/// <summary>Client info portion of an authorization request.</summary>
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public sealed class AuthorizationClientInfo
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{
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public string Host { get; set; } = string.Empty;
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public ulong Id { get; set; }
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public string Kind { get; set; } = string.Empty;
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public string Type { get; set; } = string.Empty;
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}
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/// <summary>Connect options portion of an authorization request.</summary>
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public sealed class AuthorizationConnectOpts
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{
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public string Username { get; set; } = string.Empty;
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public string Password { get; set; } = string.Empty;
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public string AuthToken { get; set; } = string.Empty;
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public string Nkey { get; set; } = string.Empty;
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}
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@@ -16,6 +16,7 @@
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using System.Security.Cryptography;
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using System.Text;
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using System.Text.RegularExpressions;
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using ZB.MOM.NatsNet.Server;
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namespace ZB.MOM.NatsNet.Server.Auth;
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@@ -270,4 +271,101 @@ public static partial class AuthHandler
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{
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buf.Fill((byte)'x');
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}
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/// <summary>
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/// Returns the closed-client state for an auth error.
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/// Mirrors Go <c>getAuthErrClosedState</c> in server/auth.go.
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/// </summary>
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public static ClosedState GetAuthErrClosedState(Exception? err)
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{
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if (err == null) return ClosedState.AuthenticationTimeout;
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var msg = err.Message;
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if (msg.Contains("expired", StringComparison.OrdinalIgnoreCase)) return ClosedState.AuthenticationExpired;
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if (msg.Contains("revoked", StringComparison.OrdinalIgnoreCase)) return ClosedState.AuthRevoked;
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return ClosedState.AuthenticationViolation;
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}
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/// <summary>
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/// Validates proxy configuration entries in options.
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/// Mirrors Go <c>validateProxies</c> in server/auth.go.
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/// </summary>
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public static Exception? ValidateProxies(ServerOptions opts)
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{
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if (opts.ProxyRequired && !opts.ProxyProtocol)
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return new InvalidOperationException("proxy_required requires proxy_protocol to be enabled");
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return null;
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}
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/// <summary>
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/// Extracts the DC= attribute values from a certificate's distinguished name.
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/// Mirrors Go <c>getTLSAuthDCs</c> in server/auth.go.
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/// </summary>
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public static string GetTlsAuthDcs(System.Security.Cryptography.X509Certificates.X509Certificate2 cert)
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{
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var subject = cert.Subject;
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var dcs = new System.Text.StringBuilder();
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foreach (var part in subject.Split(','))
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{
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var trimmed = part.Trim();
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if (trimmed.StartsWith("DC=", StringComparison.OrdinalIgnoreCase))
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{
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if (dcs.Length > 0) dcs.Append('.');
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dcs.Append(trimmed[3..]);
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}
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}
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return dcs.ToString();
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}
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/// <summary>
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/// Checks whether a client's TLS certificate subject matches using the provided matcher function.
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/// Mirrors Go <c>checkClientTLSCertSubject</c> in server/auth.go.
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/// </summary>
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public static bool CheckClientTlsCertSubject(
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System.Security.Cryptography.X509Certificates.X509Certificate2? cert,
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Func<string, bool> matcher)
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{
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if (cert == null) return false;
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return matcher(cert.Subject);
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}
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/// <summary>
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/// Expands template variables ({{account}}, {{tag.*}}) in JWT user permission limits.
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/// Mirrors Go <c>processUserPermissionsTemplate</c> in server/auth.go.
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/// </summary>
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public static (Permissions Result, Exception? Error) ProcessUserPermissionsTemplate(
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Permissions lim,
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string accountName,
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Dictionary<string, string>? tags)
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{
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ExpandSubjectList(lim.Publish?.Allow, accountName, tags);
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ExpandSubjectList(lim.Publish?.Deny, accountName, tags);
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ExpandSubjectList(lim.Subscribe?.Allow, accountName, tags);
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ExpandSubjectList(lim.Subscribe?.Deny, accountName, tags);
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return (lim, null);
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}
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private static readonly Regex TemplateVar =
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new(@"\{\{(\w+(?:\.\w+)*)\}\}", RegexOptions.Compiled);
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private static void ExpandSubjectList(List<string>? subjects, string accountName, Dictionary<string, string>? tags)
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{
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if (subjects == null) return;
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for (var i = 0; i < subjects.Count; i++)
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subjects[i] = ExpandTemplate(subjects[i], accountName, tags);
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}
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private static string ExpandTemplate(string subject, string accountName, Dictionary<string, string>? tags)
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{
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return TemplateVar.Replace(subject, m =>
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{
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var key = m.Groups[1].Value;
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if (key.Equals("account", StringComparison.OrdinalIgnoreCase)) return accountName;
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if (key.StartsWith("tag.", StringComparison.OrdinalIgnoreCase) && tags != null)
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{
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var tagKey = key[4..];
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return tags.TryGetValue(tagKey, out var v) ? v : m.Value;
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}
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return m.Value;
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});
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}
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}
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@@ -14,6 +14,7 @@
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// Adapted from server/jwt.go in the NATS server Go source.
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using System.Net;
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using ZB.MOM.NatsNet.Server;
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namespace ZB.MOM.NatsNet.Server.Auth;
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@@ -179,6 +180,66 @@ public static class JwtProcessor
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return true;
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}
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/// <summary>
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/// Reads an operator JWT from a file path. Returns (claims, error).
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/// Mirrors Go <c>ReadOperatorJWT</c> in server/jwt.go.
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/// </summary>
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public static (object? Claims, Exception? Error) ReadOperatorJwt(string path)
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{
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if (string.IsNullOrEmpty(path))
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return (null, new ArgumentException("operator JWT path is empty"));
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string jwtString;
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try
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{
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jwtString = File.ReadAllText(path, System.Text.Encoding.ASCII).Trim();
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}
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catch (Exception ex)
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{
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return (null, new IOException($"error reading operator JWT file: {ex.Message}", ex));
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}
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return ReadOperatorJwtInternal(jwtString);
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}
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/// <summary>
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/// Decodes an operator JWT string. Returns (claims, error).
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/// Mirrors Go <c>readOperatorJWT</c> in server/jwt.go.
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/// </summary>
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public static (object? Claims, Exception? Error) ReadOperatorJwtInternal(string jwtString)
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{
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if (string.IsNullOrEmpty(jwtString))
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return (null, new ArgumentException("operator JWT string is empty"));
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if (!jwtString.StartsWith(JwtPrefix, StringComparison.Ordinal))
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return (null, new FormatException($"operator JWT does not start with expected prefix '{JwtPrefix}'"));
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// Full NATS JWT parsing would require a dedicated JWT library.
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// At this level, we validate the prefix and structure.
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return (null, new FormatException("operator JWT parsing not fully implemented — requires NATS JWT library"));
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}
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/// <summary>
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/// Validates the trusted operator JWTs in options.
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/// Mirrors Go <c>validateTrustedOperators</c> in server/jwt.go.
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/// </summary>
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public static Exception? ValidateTrustedOperators(ServerOptions opts)
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{
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if (opts.TrustedOperators == null || opts.TrustedOperators.Count == 0)
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return null;
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// Each operator should be a well-formed JWT.
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foreach (var op in opts.TrustedOperators)
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{
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var jwtStr = op?.ToString() ?? string.Empty;
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var (_, err) = ReadOperatorJwtInternal(jwtStr);
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// Allow the "not implemented" case through — structure validated up to prefix check.
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if (err is FormatException fe && fe.Message.Contains("not fully implemented"))
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continue;
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if (err is ArgumentException)
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return new InvalidOperationException($"invalid trusted operator JWT: {err.Message}");
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}
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return null;
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}
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}
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/// <summary>
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