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fix: add helper plugin to keep paths within sandbox (#160)
* fix: add helper plugin to keep paths within sandbox * respond to comments, attempt to incorporate into launcher.js * respond to PR review * make non-ESM and fix paths * remove semicolon * rename plugin to "bazel-sandbox", add an opt-out parameter and add debug logs and the ability to set the JS and esbuild log levels * Update docs * Handle external module resolutions --------- Co-authored-by: Greg Magolan <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,88 @@ | ||
| const path = require('path') | ||
| const process = require('process') | ||
|
|
||
| // Regex matching any non-relative import path | ||
| const pkgImport = /^[^.]/ | ||
|
|
||
| const bindir = process.env.BAZEL_BINDIR | ||
| const execroot = process.env.JS_BINARY__EXECROOT | ||
|
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||
| // Under Bazel, esbuild will follow symlinks out of the sandbox when the sandbox is enabled. See https://github.com/aspect-build/rules_esbuild/issues/58. | ||
| // This plugin using a separate resolver to detect if the the resolution has left the execroot (which is the root of the sandbox | ||
| // when sandboxing is enabled) and patches the resolution back into the sandbox. | ||
| function bazelSandboxPlugin() { | ||
| return { | ||
| name: 'bazel-sandbox', | ||
| setup(build) { | ||
| const moduleCache = new Map() | ||
| build.onResolve( | ||
| { filter: /./ }, | ||
| async ({ path: importPath, ...otherOptions }) => { | ||
| // NB: these lines are to prevent infinite recursion when we call `build.resolve`. | ||
| if (otherOptions.pluginData) { | ||
| if (otherOptions.pluginData.executedSandboxPlugin) { | ||
| return | ||
| } | ||
| } else { | ||
| otherOptions.pluginData = {} | ||
| } | ||
| otherOptions.pluginData.executedSandboxPlugin = true | ||
|
|
||
| // Prevent us from loading different forms of a module (CJS vs ESM). | ||
| if (pkgImport.test(importPath)) { | ||
| if (!moduleCache.has(importPath)) { | ||
| moduleCache.set( | ||
| importPath, | ||
| resolveInExecroot(build, importPath, otherOptions) | ||
| ) | ||
| } | ||
| return await moduleCache.get(importPath) | ||
| } | ||
| return await resolveInExecroot(build, importPath, otherOptions) | ||
| } | ||
| ) | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| async function resolveInExecroot(build, importPath, otherOptions) { | ||
| const result = await build.resolve(importPath, otherOptions) | ||
|
|
||
| if (result.errors && result.errors.length) { | ||
| // There was an error resolving, just return the error as-is. | ||
| return result | ||
| } | ||
|
|
||
| if ( | ||
| !result.path.startsWith('.') && | ||
| !result.path.startsWith('/') && | ||
| !result.path.startsWith('\\') | ||
| ) { | ||
| // Not a relative or absolute path. Likely a module resolution that is marked "external" | ||
| return result | ||
| } | ||
|
|
||
| // If esbuild attempts to leave the execroot, map the path back into the execroot. | ||
| if (!result.path.startsWith(execroot)) { | ||
| // If it tried to leave bazel-bin, error out completely. | ||
| if (!result.path.includes(bindir)) { | ||
| throw new Error( | ||
| `Error: esbuild resolved a path outside of BAZEL_BINDIR (${bindir}): ${result.path}` | ||
| ) | ||
| } | ||
| // Otherwise remap the bindir-relative path | ||
| const correctedPath = path.join( | ||
| execroot, | ||
| result.path.substring(result.path.indexOf(bindir)) | ||
| ) | ||
| if (!!process.env.JS_BINARY__LOG_DEBUG) { | ||
| console.error( | ||
| `DEBUG: [bazel-sandbox] correcting esbuild resolution ${result.path} that left the sandbox to ${correctedPath}.` | ||
| ) | ||
| } | ||
| result.path = correctedPath | ||
| } | ||
| return result | ||
| } | ||
|
|
||
| module.exports = { bazelSandboxPlugin } |
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