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
324
dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.Auth.cs
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324
dotnet/src/ZB.MOM.NatsNet.Server/NatsServer.Auth.cs
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// Copyright 2012-2025 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.go in the NATS server Go source.
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using System.Security.Cryptography.X509Certificates;
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using ZB.MOM.NatsNet.Server.Auth;
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using ZB.MOM.NatsNet.Server.Internal;
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namespace ZB.MOM.NatsNet.Server;
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/// <summary>
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/// Authentication logic for <see cref="NatsServer"/>.
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/// Mirrors Go auth.go Server methods.
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/// </summary>
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public sealed partial class NatsServer
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{
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/// <summary>
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/// Wires up auth lookup tables from options.
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/// Mirrors Go <c>configureAuthorization</c>.
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/// </summary>
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internal void ConfigureAuthorization()
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{
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var opts = GetOpts();
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if (opts.CustomClientAuthentication != null)
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{
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_info.AuthRequired = true;
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}
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else if (_trustedKeys != null)
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{
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_info.AuthRequired = true;
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}
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else if (opts.Nkeys != null || opts.Users != null)
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{
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(_nkeys, _users) = BuildNkeysAndUsersFromOptions(opts.Nkeys, opts.Users);
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_info.AuthRequired = true;
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}
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else if (!string.IsNullOrEmpty(opts.Username) || !string.IsNullOrEmpty(opts.Authorization))
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{
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_info.AuthRequired = true;
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}
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else
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{
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_users = null;
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_nkeys = null;
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_info.AuthRequired = false;
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}
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if (opts.AuthCallout != null && string.IsNullOrEmpty(opts.AuthCallout.Account))
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Errorf("Authorization callout account not set");
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}
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private (Dictionary<string, NkeyUser>? nkeys, Dictionary<string, User>? users) BuildNkeysAndUsersFromOptions(
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List<NkeyUser>? nko, List<User>? uo)
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{
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Dictionary<string, NkeyUser>? nkeys = null;
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Dictionary<string, User>? users = null;
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if (nko != null)
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{
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nkeys = new Dictionary<string, NkeyUser>(nko.Count, StringComparer.Ordinal);
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foreach (var u in nko)
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{
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if (u.Permissions != null)
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AuthHandler.ValidateResponsePermissions(u.Permissions);
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nkeys[u.Nkey] = u;
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}
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}
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if (uo != null)
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{
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users = new Dictionary<string, User>(uo.Count, StringComparer.Ordinal);
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foreach (var u in uo)
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{
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if (u.Permissions != null)
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AuthHandler.ValidateResponsePermissions(u.Permissions);
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users[u.Username] = u;
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}
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}
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AssignGlobalAccountToOrphanUsers(nkeys, users);
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return (nkeys, users);
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}
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internal void AssignGlobalAccountToOrphanUsers(
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Dictionary<string, NkeyUser>? nkeys,
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Dictionary<string, User>? users)
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{
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if (nkeys != null)
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foreach (var u in nkeys.Values)
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u.Account ??= _gacc;
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if (users != null)
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foreach (var u in users.Values)
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u.Account ??= _gacc;
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}
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/// <summary>
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/// Entry-point auth check — dispatches by client kind.
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/// Mirrors Go <c>checkAuthentication</c>.
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/// </summary>
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internal bool CheckAuthentication(ClientConnection c)
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{
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return c.Kind switch
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{
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ClientKind.Client => IsClientAuthorized(c),
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ClientKind.Router => IsRouterAuthorized(c),
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ClientKind.Gateway => IsGatewayAuthorized(c),
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ClientKind.Leaf => IsLeafNodeAuthorized(c),
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_ => false,
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};
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}
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/// <summary>Mirrors Go <c>isClientAuthorized</c>.</summary>
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internal bool IsClientAuthorized(ClientConnection c)
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=> ProcessClientOrLeafAuthentication(c, GetOpts());
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/// <summary>
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/// Full authentication dispatch — handles all auth paths.
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/// Mirrors Go <c>processClientOrLeafAuthentication</c>.
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/// </summary>
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internal bool ProcessClientOrLeafAuthentication(ClientConnection c, ServerOptions opts)
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{
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// Auth callout check
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if (opts.AuthCallout != null)
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return ProcessClientOrLeafCallout(c, opts);
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// Proxy check
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var (trustedProxy, proxyOk) = ProxyCheck(c, opts);
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if (trustedProxy && !proxyOk)
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{
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c.SetAuthError(new InvalidOperationException("proxy not trusted"));
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return false;
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}
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// Trusted operators / JWT bearer
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if (_trustedKeys != null)
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{
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var token = c.GetAuthToken();
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if (string.IsNullOrEmpty(token))
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{
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c.SetAuthError(new InvalidOperationException("missing JWT token for trusted operator"));
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return false;
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}
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// TODO: full JWT validation against trusted operators
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return true;
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}
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// NKey authentication
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if (_nkeys != null && _nkeys.Count > 0)
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{
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var nkeyPub = c.GetNkey();
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if (!string.IsNullOrEmpty(nkeyPub) && _nkeys.TryGetValue(nkeyPub, out var nkeyUser))
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{
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var sig = c.GetNkeySig();
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var nonce = c.GetNonce(); // byte[]?
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if (!string.IsNullOrEmpty(sig) && nonce != null && nonce.Length > 0)
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{
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try
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{
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var kp = NATS.NKeys.KeyPair.FromPublicKey(nkeyPub.AsSpan());
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// Sig is base64url-encoded; nonce is raw bytes.
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var sigBytes = Convert.FromBase64String(sig.Replace('-', '+').Replace('_', '/'));
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var verified = kp.Verify(
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new ReadOnlyMemory<byte>(nonce),
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new ReadOnlyMemory<byte>(sigBytes));
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if (!verified)
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{
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c.SetAuthError(new InvalidOperationException("NKey signature verification failed"));
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return false;
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}
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}
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catch (Exception ex)
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{
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c.SetAuthError(ex);
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return false;
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}
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}
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c.SetAccount(nkeyUser.Account);
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c.SetPermissions(nkeyUser.Permissions);
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return true;
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}
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}
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// Username / password
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if (_users != null && _users.Count > 0)
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{
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var username = c.GetUsername();
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if (_users.TryGetValue(username, out var user))
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{
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if (!AuthHandler.ComparePasswords(user.Password, c.GetPassword()))
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{
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c.SetAuthError(new InvalidOperationException("invalid password"));
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return false;
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}
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c.SetAccount(user.Account);
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c.SetPermissions(user.Permissions);
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return true;
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}
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}
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// Global username/password (from opts)
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if (!string.IsNullOrEmpty(opts.Username))
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{
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if (c.GetUsername() != opts.Username ||
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!AuthHandler.ComparePasswords(opts.Password, c.GetPassword()))
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{
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c.SetAuthError(new InvalidOperationException("invalid credentials"));
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return false;
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}
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return true;
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}
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// Token (authorization)
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if (!string.IsNullOrEmpty(opts.Authorization))
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{
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if (!AuthHandler.ComparePasswords(opts.Authorization, c.GetAuthToken()))
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{
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c.SetAuthError(new InvalidOperationException("bad authorization token"));
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return false;
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}
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return true;
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}
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// TLS cert mapping
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if (opts.TlsMap)
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{
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var cert = c.GetTlsCertificate();
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if (!AuthHandler.CheckClientTlsCertSubject(cert, _ => true))
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{
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c.SetAuthError(new InvalidOperationException("TLS cert mapping failed"));
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return false;
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}
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return true;
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}
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// No auth required
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if (!_info.AuthRequired) return true;
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c.SetAuthError(new InvalidOperationException("no credentials provided"));
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return false;
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}
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/// <summary>Mirrors Go <c>isRouterAuthorized</c>.</summary>
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internal bool IsRouterAuthorized(ClientConnection c)
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{
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var opts = GetOpts();
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if (opts.Cluster.Port == 0) return true;
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return true; // TODO: full route auth when ClusterOpts is fully typed
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}
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/// <summary>Mirrors Go <c>isGatewayAuthorized</c>.</summary>
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internal bool IsGatewayAuthorized(ClientConnection c)
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{
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var opts = GetOpts();
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if (string.IsNullOrEmpty(opts.Gateway.Name)) return true;
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return true;
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}
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/// <summary>Mirrors Go <c>registerLeafWithAccount</c>.</summary>
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internal bool RegisterLeafWithAccount(ClientConnection c, string accountName)
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{
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var (acc, _) = LookupAccount(accountName);
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if (acc == null) return false;
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c.SetAccount(acc);
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return true;
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}
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/// <summary>Mirrors Go <c>isLeafNodeAuthorized</c>.</summary>
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internal bool IsLeafNodeAuthorized(ClientConnection c)
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=> ProcessClientOrLeafAuthentication(c, GetOpts());
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/// <summary>Mirrors Go <c>checkAuthforWarnings</c>.</summary>
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internal void CheckAuthforWarnings()
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{
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var opts = GetOpts();
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if (opts.Users != null && !string.IsNullOrEmpty(opts.Username))
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Warnf("Having a global password along with users/nkeys is not recommended");
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}
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/// <summary>Mirrors Go <c>proxyCheck</c>.</summary>
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internal (bool TrustedProxy, bool Ok) ProxyCheck(ClientConnection c, ServerOptions opts)
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{
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if (!opts.ProxyProtocol) return (false, false);
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// TODO: check remote IP against configured trusted proxy addresses
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return (true, true);
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}
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/// <summary>Mirrors Go <c>processProxiesTrustedKeys</c>.</summary>
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internal void ProcessProxiesTrustedKeys()
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{
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// TODO: parse proxy trusted key strings into _proxyTrustedKeys set
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}
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/// <summary>
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/// Forwards to AuthCallout.ProcessClientOrLeafCallout.
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/// Mirrors Go <c>processClientOrLeafCallout</c>.
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/// </summary>
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internal bool ProcessClientOrLeafCallout(ClientConnection c, ServerOptions opts)
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=> AuthCallout.ProcessClientOrLeafCallout(this, c, opts);
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/// <summary>
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/// Config reload stub.
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/// Mirrors Go <c>Server.Reload</c>.
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/// </summary>
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internal void Reload() => throw new NotImplementedException("TODO: config reload — implement in later session");
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/// <summary>
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/// Returns a Task that shuts the server down asynchronously.
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/// Wraps the synchronous <see cref="Shutdown"/> method.
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/// </summary>
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internal Task ShutdownAsync() => Task.Run(Shutdown);
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}
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