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irvingoujAtDevolutionirvingoujAtDevolution
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feat(agent): add Agent Tunnel configuration dialog (#1789)
## Summary Adds an optional **Agent Tunnel** wizard step to the Devolutions Agent MSI installer so admins can enrol the agent in a Gateway QUIC tunnel during install — UI or unattended. Three text fields in the dialog: enrolment string, advertise subnets, advertise domains. The feature is opt-in (`isEnabled: false, allowChange: true`); the dialog is skipped when the feature isn't selected, and an empty enrolment string skips tunnel setup even if the feature is on, so the installer remains usable for non-tunnel deployments. Smoke-tested end-to-end against a local DVLS + Gateway + Agent stack: MSI built clean, agent enrolled successfully, RDP TCP traffic routed through the agent tunnel to `IT-HELP-DC:3389`. ## MSI public properties (unattended install) ``` msiexec /i DevolutionsAgent.msi /qn ADDLOCAL="...,AgentTunnel" \ AGENT_TUNNEL_ENROLLMENT_STRING="dgw-enroll:v1:<base64>" \ AGENT_TUNNEL_ADVERTISE_SUBNETS="10.10.0.0/24" \ AGENT_TUNNEL_ADVERTISE_DOMAINS="corp.example.com" ``` ## Custom action `EnrollAgentTunnel` is deferred + elevated + `Impersonate=false`, runs `Before StartServices`, gated by `Features.AGENT_TUNNEL_FEATURE.BeingInstall()`. It: 1. Validates the `dgw-enroll:v1:` prefix, strips whitespace, pads base64url, decodes JSON payload (`api_base_url`, `enrollment_token`, optional `name`). 2. Shells out to `devolutions-agent.exe enroll <url> <token> <name> [subnets]` with a 60s timeout; on timeout the child is killed. 3. Token is redacted (`***`) symmetrically across the command-line log and child stdout/stderr. 4. After enrolment, advertise domains are patched into `Tunnel.AdvertiseDomains` of `%ProgramData%\Devolutions\Agent\agent.json`. This matches the design that advertise domains live in config, not on the CLI (replaces the closed #1774). ## Depends on - #1773 — DVLS-signed JWT enrolment flow (`/jet/tunnel/enroll`) - #1775 — agent cert renewal (referenced by the bundled agent binary) Both merged to master 2026-05-20. ## Test plan - [x] Cold MSI build clean, no errors (8 preexisting `CNDL1138`/`CNDL1006` warnings from existing code, not introduced here) - [x] Wizard order: Welcome → Features → AgentTunnel → InstallDir → VerifyReady - [x] AgentTunnel dialog skipped when feature not selected - [x] Empty enrolment string skips enrolment (no failure) - [x] Invalid `dgw-enroll:v1:` prefix → validation error in dialog - [x] Invalid base64 → validation error in dialog (caught client-side, not at CA time) - [x] Smoke test against local DVLS-signed enrolment JWT — agent registered, cert issued - [x] Smoke test routing: RDP TCP through agent tunnel to `IT-HELP-DC:3389` succeeds ## Review history Pre-review and codex-review passes folded into the single commit. Notable points addressed: - Robust JSON payload parsing (`JObject`, `Value<string>()`, `IsNullOrWhiteSpace` validation) - Symmetric token redaction (cmdline + stdout + stderr) - `WaitForExit(60_000)` return-value check with child kill on timeout - Whitespace-stripped + padded base64url decoding on both dialog validation and CA - ADDLOCAL CSV value trimming for admin-supplied lists with whitespace - Dropped 2 stray `InstallDirDlg*` strings leaked into en-us - Added 5 missing fr-fr translations
1 parent c606a52 commit 26f23c0

10 files changed

Lines changed: 790 additions & 4 deletions

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‎package/AgentWindowsManaged/Actions/AgentActions.cs‎

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@@ -279,6 +279,28 @@ internal static class AgentActions
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UsesProperties = UseProperties(new[] { AgentProperties.featuresToConfigure })
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};
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private static readonly ElevatedManagedAction enrollAgentTunnel = new(
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new Id($"CA.{nameof(enrollAgentTunnel)}"),
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CustomActions.EnrollAgentTunnel,
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Return.check,
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When.Before, Step.StartServices,
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Features.AGENT_TUNNEL_FEATURE.BeingInstall(),
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Sequence.InstallExecuteSequence)
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{
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Execute = Execute.deferred,
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Impersonate = false,
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// Deferred CAs only see properties bubbled through CustomActionData. The Set_<CA>_Props
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// immediate action expands [PROP] for each entry below before the deferred CA runs.
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UsesProperties = string.Join(";", new[]
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{
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AgentProperties.AgentTunnelEnrollmentString,
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AgentProperties.AgentTunnelAgentName,
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AgentProperties.AgentTunnelAdvertiseSubnets,
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AgentProperties.AgentTunnelAdvertiseDomains,
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AgentProperties.InstallDir,
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}.Select(p => $"{p}=[{p}]")),
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};
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private static readonly ElevatedManagedAction registerExplorerCommand = new(
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CustomActions.RegisterExplorerCommand
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)
@@ -352,6 +374,7 @@ private static string UseProperties(IEnumerable<IWixProperty> properties)
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setArpInstallLocation,
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setFeaturesToConfigure,
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configureFeatures,
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enrollAgentTunnel,
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createProgramDataDirectory,
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setProgramDataDirectoryPermissions,
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createProgramDataPedmDirectories,

‎package/AgentWindowsManaged/Actions/CustomActions.cs‎

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@@ -3,6 +3,7 @@
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using Microsoft.Deployment.WindowsInstaller;
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using Microsoft.Win32;
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using Newtonsoft.Json;
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using Newtonsoft.Json.Linq;
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using System;
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using System.Collections.Generic;
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using System.ComponentModel;
@@ -12,6 +13,7 @@
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using System.Linq;
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using System.Runtime.InteropServices;
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using System.Security.Claims;
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using System.Text;
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using System.Threading;
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using WixSharp;
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using File = System.IO.File;
@@ -318,6 +320,196 @@ public static ActionResult SetFeaturesToConfigure(Session session)
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return ActionResult.Success;
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}
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[CustomAction]
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public static ActionResult EnrollAgentTunnel(Session session)
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{
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string enrollmentString = session.Property(AgentProperties.AgentTunnelEnrollmentString)?.Trim() ?? string.Empty;
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string subnetsArg = session.Property(AgentProperties.AgentTunnelAdvertiseSubnets)?.Trim() ?? string.Empty;
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string domainsArg = session.Property(AgentProperties.AgentTunnelAdvertiseDomains)?.Trim() ?? string.Empty;
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string agentNameArg = session.Property(AgentProperties.AgentTunnelAgentName)?.Trim() ?? string.Empty;
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ActionResult Fail(string msg)
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{
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session.Log(msg);
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using Record record = new(0) { FormatString = msg };
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session.Message(InstallMessage.Error, record);
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return ActionResult.Failure;
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}
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if (enrollmentString.Length == 0)
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{
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return Fail("An enrollment string is required. Paste the enrollment string provided by your gateway operator, or deselect the Agent Tunnel feature.");
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}
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try
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{
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// Hand the enrollment string through verbatim. The agent's
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// `up --enrollment-string` parses the gateway URL and agent name out of it.
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// Advertise domains aren't a CLI flag — agent.json carries them — so we patch
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// that after enrollment succeeds.
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string installDir = session.Property(AgentProperties.InstallDir);
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string exePath = Path.Combine(installDir, Includes.EXECUTABLE_NAME);
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// agent.exe `up` requires an agent name. Resolution: dialog value > JWT's
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// jet_agent_name (left to the agent CLI by omitting --name) > local computer name.
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string resolvedName = agentNameArg;
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if (resolvedName.Length == 0 && !JwtHasAgentName(enrollmentString))
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{
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resolvedName = Environment.MachineName;
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session.Log($"JWT carried no jet_agent_name and no name was provided in the wizard; falling back to computer name '{resolvedName}'");
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}
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// Only `--enrollment-string` is mandatory at enroll time — the gateway needs the
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// JWT to authenticate. `--name` is conditionally passed because the gateway
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// embeds it in the issued client cert and registers the agent under it; agent.json
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// can't carry it before `up` runs because the file doesn't exist yet. Everything
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// else (advertise subnets, advertise domains) is patched into agent.json *after*
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// enrollment, so we don't accumulate parallel CLI surfaces for what is ultimately
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// configuration data.
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string arguments = $"up --enrollment-string \"{enrollmentString}\"";
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if (resolvedName.Length != 0)
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{
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arguments += $" --name \"{resolvedName}\"";
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}
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string Redact(string s) => s.Replace(enrollmentString, "***");
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session.Log($"Running enrollment: {exePath} {Redact(arguments)}");
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ProcessStartInfo startInfo = new(exePath, arguments)
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{
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UseShellExecute = false,
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RedirectStandardOutput = true,
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RedirectStandardError = true,
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CreateNoWindow = true,
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WorkingDirectory = ProgramDataDirectory,
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};
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using Process process = Process.Start(startInfo);
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if (!process.WaitForExit(60_000))
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{
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try
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{
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process.Kill();
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}
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catch
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{
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// Already exited between WaitForExit timing out and Kill firing.
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}
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return Fail("Agent tunnel enrollment timed out. Verify your Devolutions Gateway is reachable from this machine.");
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}
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string stdout = process.StandardOutput.ReadToEnd();
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string stderr = process.StandardError.ReadToEnd();
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if (!string.IsNullOrEmpty(stdout))
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{
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session.Log($"enrollment stdout: {Redact(stdout)}");
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}
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if (!string.IsNullOrEmpty(stderr))
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{
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session.Log($"enrollment stderr: {Redact(stderr)}");
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}
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if (process.ExitCode != 0)
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{
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string detail = !string.IsNullOrWhiteSpace(stderr) ? Redact(stderr).Trim() : $"exit code {process.ExitCode}";
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return Fail($"Agent tunnel enrollment failed: {detail}");
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}
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if (subnetsArg.Length != 0 || domainsArg.Length != 0)
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{
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WriteTunnelAdvertisementsToConfig(session, subnetsArg, domainsArg);
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}
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session.Log("Agent tunnel enrollment completed successfully");
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return ActionResult.Success;
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}
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catch (Exception e)
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{
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return Fail($"Agent tunnel enrollment failed: {e.Message}");
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}
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}
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private static bool JwtHasAgentName(string jwt)
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{
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try
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{
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string[] parts = jwt.Split('.');
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if (parts.Length != 3) return false;
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string payload = parts[1].Replace('-', '+').Replace('_', '/');
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payload = payload.PadRight((payload.Length + 3) & ~3, '=');
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string json = Encoding.UTF8.GetString(Convert.FromBase64String(payload));
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string name = JObject.Parse(json)["jet_agent_name"]?.ToString();
442+
return !string.IsNullOrWhiteSpace(name);
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}
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catch
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{
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return false;
447+
}
448+
}
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/// <summary>
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/// Patch the freshly-written agent.json's <c>Tunnel</c> section with the operator's
452+
/// advertised subnets and DNS suffixes from the wizard. Keeping this out of the
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/// <c>agent.exe up</c> command line means we only carry mandatory enroll inputs on the
454+
/// CLI; everything else flows through the same configuration file the agent reads at
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/// runtime.
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/// </summary>
457+
private static void WriteTunnelAdvertisementsToConfig(Session session, string subnetsCsv, string domainsCsv)
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{
459+
string configPath = Path.Combine(ProgramDataDirectory, "agent.json");
460+
if (!File.Exists(configPath))
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{
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session.Log($"agent.json not found at {configPath}; cannot persist tunnel advertisements");
463+
return;
464+
}
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466+
try
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{
468+
string[] subnets = SplitCsv(subnetsCsv);
469+
string[] domains = SplitCsv(domainsCsv);
470+
471+
if (subnets.Length == 0 && domains.Length == 0)
472+
{
473+
return;
474+
}
475+
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JObject root = JObject.Parse(File.ReadAllText(configPath));
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// ConfFile uses serde rename_all = "PascalCase", so the tunnel section is keyed
479+
// "Tunnel" and the fields are "AdvertiseSubnets" / "AdvertiseDomains".
480+
if (root["Tunnel"] is not JObject tunnel)
481+
{
482+
session.Log("agent.json has no Tunnel section after enrollment; skipping tunnel advertisements write");
483+
return;
484+
}
485+
486+
if (subnets.Length != 0)
487+
{
488+
tunnel["AdvertiseSubnets"] = new JArray(subnets);
489+
}
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if (domains.Length != 0)
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{
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tunnel["AdvertiseDomains"] = new JArray(domains);
493+
}
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File.WriteAllText(configPath, root.ToString(Formatting.Indented));
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session.Log($"Wrote {subnets.Length} advertise_subnets and {domains.Length} advertise_domains entries to agent.json");
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}
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catch (Exception e)
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{
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// Don't fail the install over this — the tunnel works fine without these
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// advertisements; the agent simply won't route additional traffic for them.
502+
session.Log($"Failed to write tunnel advertisements to agent.json: {e}");
503+
}
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}
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private static string[] SplitCsv(string csv) =>
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(csv ?? string.Empty)
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.Split(',')
509+
.Select(s => s.Trim())
510+
.Where(s => !string.IsNullOrEmpty(s))
511+
.ToArray();
512+
321513
[CustomAction]
322514
public static ActionResult ConfigureFeatures(Session session)
323515
{

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