Add binary signature verification

Author: code-asher

CHANGELOG.md

@@ -2,12 +2,20 @@
 
 ## Unreleased
 
+### Changed
+
+- Coder output panel enhancements: All log entries now include timestamps, and you
+  can filter messages by log level in the panel.
+
+### Added
+
 - Update `/openDevContainer` to support all dev container features when hostPath
   and configFile are provided.
 - Add `coder.disableUpdateNotifications` setting to disable workspace template
   update notifications.
-- Coder output panel enhancements: All log entries now include timestamps, and you
-  can filter messages by log level in the panel.
+- Add binary signature verification. This can be disabled with
+  `coder.disableSignatureVerification` if you purposefully run a binary that is
+  not signed by Coder (for example a binary you built yourself).
 
 ## [v1.9.2](https://github.com/coder/vscode-coder/releases/tag/v1.9.2) 2025-06-25
 

package.json

@@ -114,6 +114,11 @@
 					"markdownDescription": "Disable notifications when workspace template updates are available.",
 					"type": "boolean",
 					"default": false
+				},
+				"coder.disableSignatureVerification": {
+					"markdownDescription": "Disable Coder CLI signature verification, which can be useful if you run an unsigned fork of the binary.",
+					"type": "boolean",
+					"default": false
 				}
 			}
 		},
@@ -289,6 +294,7 @@
 		"jsonc-parser": "^3.3.1",
 		"memfs": "^4.17.1",
 		"node-forge": "^1.3.1",
+		"openpgp": "^6.2.0",
 		"pretty-bytes": "^6.1.1",
 		"proxy-agent": "^6.4.0",
 		"semver": "^7.7.1",

pgp-public.key

@@ -0,0 +1,99 @@
+-----BEGIN PGP PUBLIC KEY BLOCK-----
+
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+=dLmT
+-----END PGP PUBLIC KEY BLOCK-----

src/api-helper.ts

@@ -3,7 +3,10 @@ import { Workspace, WorkspaceAgent } from "coder/site/src/api/typesGenerated";
 import { ErrorEvent } from "eventsource";
 import { z } from "zod";
 
-export function errToStr(error: unknown, def: string) {
+export function errToStr(
+	error: unknown,
+	def: string = "No error message provided",
+) {
 	if (error instanceof Error && error.message) {
 		return error.message;
 	} else if (isApiError(error)) {

src/cliManager.ts

@@ -78,8 +78,8 @@ export type RemovalResult = { fileName: string; error: unknown };
 
 /**
  * Remove binaries in the same directory as the specified path that have a
- * .old-* or .temp-* extension.  Return a list of files and the errors trying to
- * remove them, when applicable.
+ * .old-* or .temp-* extension along with signatures (files ending in .asc).
+ * Return a list of files and the errors trying to remove them, when applicable.
  */
 export async function rmOld(binPath: string): Promise<RemovalResult[]> {
 	const binDir = path.dirname(binPath);
@@ -88,7 +88,11 @@ export async function rmOld(binPath: string): Promise<RemovalResult[]> {
 		const results: RemovalResult[] = [];
 		for (const file of files) {
 			const fileName = path.basename(file);
-			if (fileName.includes(".old-") || fileName.includes(".temp-")) {
+			if (
+				fileName.includes(".old-") ||
+				fileName.includes(".temp-") ||
+				fileName.endsWith(".asc")
+			) {
 				try {
 					await fs.rm(path.join(binDir, file), { force: true });
 					results.push({ fileName, error: undefined });

src/extension.ts

@@ -49,6 +49,7 @@ export async function activate(ctx: vscode.ExtensionContext): Promise<void> {
 
 	const output = vscode.window.createOutputChannel("Coder", { log: true });
 	const storage = new Storage(
+		vscodeProposed,
 		output,
 		ctx.globalState,
 		ctx.secrets,

src/pgp.ts

@@ -0,0 +1,92 @@
+import { createReadStream, promises as fs } from "fs";
+import * as openpgp from "openpgp";
+import * as path from "path";
+import { Readable } from "stream";
+import * as vscode from "vscode";
+import { errToStr } from "./api-helper";
+
+export type Key = openpgp.Key;
+
+export enum VerificationErrorCode {
+	/* The signature does not match. */
+	Invalid = "Invalid",
+	/* Failed to read the signature or the file to verify. */
+	Read = "Read",
+}
+
+export class VerificationError extends Error {
+	constructor(
+		public readonly code: VerificationErrorCode,
+		message: string,
+	) {
+		super(message);
+	}
+
+	summary(): string {
+		switch (this.code) {
+			case VerificationErrorCode.Invalid:
+				return "Signature does not match";
+			default:
+				return "Failed to read signature";
+		}
+	}
+}
+
+/**
+ * Return the public keys bundled with the plugin.
+ */
+export async function readPublicKeys(
+	logger: vscode.LogOutputChannel,
+): Promise<Key[]> {
+	const keyFile = path.join(__dirname, "../pgp-public.key");
+	logger.info("Reading public key", keyFile);
+	const armoredKeys = await fs.readFile(keyFile, "utf8");
+	return openpgp.readKeys({ armoredKeys });
+}
+
+/**
+ * Given public keys, a path to a file to verify, and a path to a detached
+ * signature, verify the file's signature.  Return true if valid, otherwise
+ * return VerificationError.
+ */
+export async function verifySignature(
+	logger: vscode.LogOutputChannel,
+	publicKeys: openpgp.Key[],
+	cliPath: string,
+	signaturePath: string,
+): Promise<true | VerificationError> {
+	try {
+		logger.info("Reading signature", signaturePath);
+		const armoredSignature = await fs.readFile(signaturePath, "utf8");
+		const signature = await openpgp.readSignature({ armoredSignature });
+
+		logger.info("Verifying signature of", cliPath);
+		const message = await openpgp.createMessage({
+			// openpgpjs only accepts web readable streams.
+			binary: Readable.toWeb(createReadStream(cliPath)),
+		});
+		const verificationResult = await openpgp.verify({
+			message,
+			signature,
+			verificationKeys: publicKeys,
+		});
+		for await (const _ of verificationResult.data) {
+			// The docs indicate this data must be consumed; it triggers the
+			// verification of the data.
+		}
+		try {
+			const { verified } = verificationResult.signatures[0];
+			await verified; // Throws on invalid signature.
+			logger.info("Binary signature matches");
+		} catch (e) {
+			const error = `Unable to verify the authenticity of the binary: ${errToStr(e)}. The binary may have been tampered with.`;
+			logger.warn(error);
+			return new VerificationError(VerificationErrorCode.Invalid, error);
+		}
+	} catch (e) {
+		const error = `Failed to read signature or binary: ${errToStr(e)}.`;
+		logger.warn(error);
+		return new VerificationError(VerificationErrorCode.Read, error);
+	}
+	return true;
+}