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Diffstat (limited to 'middleware/node_modules/safer-buffer')
| -rw-r--r-- | middleware/node_modules/safer-buffer/LICENSE | 21 | ||||
| -rw-r--r-- | middleware/node_modules/safer-buffer/Porting-Buffer.md | 268 | ||||
| -rw-r--r-- | middleware/node_modules/safer-buffer/Readme.md | 156 | ||||
| -rw-r--r-- | middleware/node_modules/safer-buffer/dangerous.js | 58 | ||||
| -rw-r--r-- | middleware/node_modules/safer-buffer/package.json | 34 | ||||
| -rw-r--r-- | middleware/node_modules/safer-buffer/safer.js | 77 | ||||
| -rw-r--r-- | middleware/node_modules/safer-buffer/tests.js | 406 |
7 files changed, 1020 insertions, 0 deletions
diff --git a/middleware/node_modules/safer-buffer/LICENSE b/middleware/node_modules/safer-buffer/LICENSE new file mode 100644 index 0000000..4fe9e6f --- /dev/null +++ b/middleware/node_modules/safer-buffer/LICENSE @@ -0,0 +1,21 @@ +MIT License + +Copyright (c) 2018 Nikita Skovoroda <chalkerx@gmail.com> + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in all +copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. diff --git a/middleware/node_modules/safer-buffer/Porting-Buffer.md b/middleware/node_modules/safer-buffer/Porting-Buffer.md new file mode 100644 index 0000000..68d86ba --- /dev/null +++ b/middleware/node_modules/safer-buffer/Porting-Buffer.md @@ -0,0 +1,268 @@ +# Porting to the Buffer.from/Buffer.alloc API + +<a id="overview"></a> +## Overview + +- [Variant 1: Drop support for Node.js ≤ 4.4.x and 5.0.0 — 5.9.x.](#variant-1) (*recommended*) +- [Variant 2: Use a polyfill](#variant-2) +- [Variant 3: manual detection, with safeguards](#variant-3) + +### Finding problematic bits of code using grep + +Just run `grep -nrE '[^a-zA-Z](Slow)?Buffer\s*\(' --exclude-dir node_modules`. + +It will find all the potentially unsafe places in your own code (with some considerably unlikely +exceptions). + +### Finding problematic bits of code using Node.js 8 + +If you’re using Node.js ≥ 8.0.0 (which is recommended), Node.js exposes multiple options that help with finding the relevant pieces of code: + +- `--trace-warnings` will make Node.js show a stack trace for this warning and other warnings that are printed by Node.js. +- `--trace-deprecation` does the same thing, but only for deprecation warnings. +- `--pending-deprecation` will show more types of deprecation warnings. In particular, it will show the `Buffer()` deprecation warning, even on Node.js 8. + +You can set these flags using an environment variable: + +```console +$ export NODE_OPTIONS='--trace-warnings --pending-deprecation' +$ cat example.js +'use strict'; +const foo = new Buffer('foo'); +$ node example.js +(node:7147) [DEP0005] DeprecationWarning: The Buffer() and new Buffer() constructors are not recommended for use due to security and usability concerns. Please use the new Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() construction methods instead. + at showFlaggedDeprecation (buffer.js:127:13) + at new Buffer (buffer.js:148:3) + at Object.<anonymous> (/path/to/example.js:2:13) + [... more stack trace lines ...] +``` + +### Finding problematic bits of code using linters + +Eslint rules [no-buffer-constructor](https://eslint.org/docs/rules/no-buffer-constructor) +or +[node/no-deprecated-api](https://github.com/mysticatea/eslint-plugin-node/blob/master/docs/rules/no-deprecated-api.md) +also find calls to deprecated `Buffer()` API. Those rules are included in some pre-sets. + +There is a drawback, though, that it doesn't always +[work correctly](https://github.com/chalker/safer-buffer#why-not-safe-buffer) when `Buffer` is +overriden e.g. with a polyfill, so recommended is a combination of this and some other method +described above. + +<a id="variant-1"></a> +## Variant 1: Drop support for Node.js ≤ 4.4.x and 5.0.0 — 5.9.x. + +This is the recommended solution nowadays that would imply only minimal overhead. + +The Node.js 5.x release line has been unsupported since July 2016, and the Node.js 4.x release line reaches its End of Life in April 2018 (→ [Schedule](https://github.com/nodejs/Release#release-schedule)). This means that these versions of Node.js will *not* receive any updates, even in case of security issues, so using these release lines should be avoided, if at all possible. + +What you would do in this case is to convert all `new Buffer()` or `Buffer()` calls to use `Buffer.alloc()` or `Buffer.from()`, in the following way: + +- For `new Buffer(number)`, replace it with `Buffer.alloc(number)`. +- For `new Buffer(string)` (or `new Buffer(string, encoding)`), replace it with `Buffer.from(string)` (or `Buffer.from(string, encoding)`). +- For all other combinations of arguments (these are much rarer), also replace `new Buffer(...arguments)` with `Buffer.from(...arguments)`. + +Note that `Buffer.alloc()` is also _faster_ on the current Node.js versions than +`new Buffer(size).fill(0)`, which is what you would otherwise need to ensure zero-filling. + +Enabling eslint rule [no-buffer-constructor](https://eslint.org/docs/rules/no-buffer-constructor) +or +[node/no-deprecated-api](https://github.com/mysticatea/eslint-plugin-node/blob/master/docs/rules/no-deprecated-api.md) +is recommended to avoid accidential unsafe Buffer API usage. + +There is also a [JSCodeshift codemod](https://github.com/joyeecheung/node-dep-codemod#dep005) +for automatically migrating Buffer constructors to `Buffer.alloc()` or `Buffer.from()`. +Note that it currently only works with cases where the arguments are literals or where the +constructor is invoked with two arguments. + +_If you currently support those older Node.js versions and dropping them would be a semver-major change +for you, or if you support older branches of your packages, consider using [Variant 2](#variant-2) +or [Variant 3](#variant-3) on older branches, so people using those older branches will also receive +the fix. That way, you will eradicate potential issues caused by unguarded Buffer API usage and +your users will not observe a runtime deprecation warning when running your code on Node.js 10._ + +<a id="variant-2"></a> +## Variant 2: Use a polyfill + +Utilize [safer-buffer](https://www.npmjs.com/package/safer-buffer) as a polyfill to support older +Node.js versions. + +You would take exacly the same steps as in [Variant 1](#variant-1), but with a polyfill +`const Buffer = require('safer-buffer').Buffer` in all files where you use the new `Buffer` api. + +Make sure that you do not use old `new Buffer` API — in any files where the line above is added, +using old `new Buffer()` API will _throw_. It will be easy to notice that in CI, though. + +Alternatively, you could use [buffer-from](https://www.npmjs.com/package/buffer-from) and/or +[buffer-alloc](https://www.npmjs.com/package/buffer-alloc) [ponyfills](https://ponyfill.com/) — +those are great, the only downsides being 4 deps in the tree and slightly more code changes to +migrate off them (as you would be using e.g. `Buffer.from` under a different name). If you need only +`Buffer.from` polyfilled — `buffer-from` alone which comes with no extra dependencies. + +_Alternatively, you could use [safe-buffer](https://www.npmjs.com/package/safe-buffer) — it also +provides a polyfill, but takes a different approach which has +[it's drawbacks](https://github.com/chalker/safer-buffer#why-not-safe-buffer). It will allow you +to also use the older `new Buffer()` API in your code, though — but that's arguably a benefit, as +it is problematic, can cause issues in your code, and will start emitting runtime deprecation +warnings starting with Node.js 10._ + +Note that in either case, it is important that you also remove all calls to the old Buffer +API manually — just throwing in `safe-buffer` doesn't fix the problem by itself, it just provides +a polyfill for the new API. I have seen people doing that mistake. + +Enabling eslint rule [no-buffer-constructor](https://eslint.org/docs/rules/no-buffer-constructor) +or +[node/no-deprecated-api](https://github.com/mysticatea/eslint-plugin-node/blob/master/docs/rules/no-deprecated-api.md) +is recommended. + +_Don't forget to drop the polyfill usage once you drop support for Node.js < 4.5.0._ + +<a id="variant-3"></a> +## Variant 3 — manual detection, with safeguards + +This is useful if you create Buffer instances in only a few places (e.g. one), or you have your own +wrapper around them. + +### Buffer(0) + +This special case for creating empty buffers can be safely replaced with `Buffer.concat([])`, which +returns the same result all the way down to Node.js 0.8.x. + +### Buffer(notNumber) + +Before: + +```js +var buf = new Buffer(notNumber, encoding); +``` + +After: + +```js +var buf; +if (Buffer.from && Buffer.from !== Uint8Array.from) { + buf = Buffer.from(notNumber, encoding); +} else { + if (typeof notNumber === 'number') + throw new Error('The "size" argument must be of type number.'); + buf = new Buffer(notNumber, encoding); +} +``` + +`encoding` is optional. + +Note that the `typeof notNumber` before `new Buffer` is required (for cases when `notNumber` argument is not +hard-coded) and _is not caused by the deprecation of Buffer constructor_ — it's exactly _why_ the +Buffer constructor is deprecated. Ecosystem packages lacking this type-check caused numereous +security issues — situations when unsanitized user input could end up in the `Buffer(arg)` create +problems ranging from DoS to leaking sensitive information to the attacker from the process memory. + +When `notNumber` argument is hardcoded (e.g. literal `"abc"` or `[0,1,2]`), the `typeof` check can +be omitted. + +Also note that using TypeScript does not fix this problem for you — when libs written in +`TypeScript` are used from JS, or when user input ends up there — it behaves exactly as pure JS, as +all type checks are translation-time only and are not present in the actual JS code which TS +compiles to. + +### Buffer(number) + +For Node.js 0.10.x (and below) support: + +```js +var buf; +if (Buffer.alloc) { + buf = Buffer.alloc(number); +} else { + buf = new Buffer(number); + buf.fill(0); +} +``` + +Otherwise (Node.js ≥ 0.12.x): + +```js +const buf = Buffer.alloc ? Buffer.alloc(number) : new Buffer(number).fill(0); +``` + +## Regarding Buffer.allocUnsafe + +Be extra cautious when using `Buffer.allocUnsafe`: + * Don't use it if you don't have a good reason to + * e.g. you probably won't ever see a performance difference for small buffers, in fact, those + might be even faster with `Buffer.alloc()`, + * if your code is not in the hot code path — you also probably won't notice a difference, + * keep in mind that zero-filling minimizes the potential risks. + * If you use it, make sure that you never return the buffer in a partially-filled state, + * if you are writing to it sequentially — always truncate it to the actuall written length + +Errors in handling buffers allocated with `Buffer.allocUnsafe` could result in various issues, +ranged from undefined behaviour of your code to sensitive data (user input, passwords, certs) +leaking to the remote attacker. + +_Note that the same applies to `new Buffer` usage without zero-filling, depending on the Node.js +version (and lacking type checks also adds DoS to the list of potential problems)._ + +<a id="faq"></a> +## FAQ + +<a id="design-flaws"></a> +### What is wrong with the `Buffer` constructor? + +The `Buffer` constructor could be used to create a buffer in many different ways: + +- `new Buffer(42)` creates a `Buffer` of 42 bytes. Before Node.js 8, this buffer contained + *arbitrary memory* for performance reasons, which could include anything ranging from + program source code to passwords and encryption keys. +- `new Buffer('abc')` creates a `Buffer` that contains the UTF-8-encoded version of + the string `'abc'`. A second argument could specify another encoding: For example, + `new Buffer(string, 'base64')` could be used to convert a Base64 string into the original + sequence of bytes that it represents. +- There are several other combinations of arguments. + +This meant that, in code like `var buffer = new Buffer(foo);`, *it is not possible to tell +what exactly the contents of the generated buffer are* without knowing the type of `foo`. + +Sometimes, the value of `foo` comes from an external source. For example, this function +could be exposed as a service on a web server, converting a UTF-8 string into its Base64 form: + +``` +function stringToBase64(req, res) { + // The request body should have the format of `{ string: 'foobar' }` + const rawBytes = new Buffer(req.body.string) + const encoded = rawBytes.toString('base64') + res.end({ encoded: encoded }) +} +``` + +Note that this code does *not* validate the type of `req.body.string`: + +- `req.body.string` is expected to be a string. If this is the case, all goes well. +- `req.body.string` is controlled by the client that sends the request. +- If `req.body.string` is the *number* `50`, the `rawBytes` would be 50 bytes: + - Before Node.js 8, the content would be uninitialized + - After Node.js 8, the content would be `50` bytes with the value `0` + +Because of the missing type check, an attacker could intentionally send a number +as part of the request. Using this, they can either: + +- Read uninitialized memory. This **will** leak passwords, encryption keys and other + kinds of sensitive information. (Information leak) +- Force the program to allocate a large amount of memory. For example, when specifying + `500000000` as the input value, each request will allocate 500MB of memory. + This can be used to either exhaust the memory available of a program completely + and make it crash, or slow it down significantly. (Denial of Service) + +Both of these scenarios are considered serious security issues in a real-world +web server context. + +when using `Buffer.from(req.body.string)` instead, passing a number will always +throw an exception instead, giving a controlled behaviour that can always be +handled by the program. + +<a id="ecosystem-usage"></a> +### The `Buffer()` constructor has been deprecated for a while. Is this really an issue? + +Surveys of code in the `npm` ecosystem have shown that the `Buffer()` constructor is still +widely used. This includes new code, and overall usage of such code has actually been +*increasing*. diff --git a/middleware/node_modules/safer-buffer/Readme.md b/middleware/node_modules/safer-buffer/Readme.md new file mode 100644 index 0000000..14b0822 --- /dev/null +++ b/middleware/node_modules/safer-buffer/Readme.md @@ -0,0 +1,156 @@ +# safer-buffer [![travis][travis-image]][travis-url] [![npm][npm-image]][npm-url] [![javascript style guide][standard-image]][standard-url] [![Security Responsible Disclosure][secuirty-image]][secuirty-url] + +[travis-image]: https://travis-ci.org/ChALkeR/safer-buffer.svg?branch=master +[travis-url]: https://travis-ci.org/ChALkeR/safer-buffer +[npm-image]: https://img.shields.io/npm/v/safer-buffer.svg +[npm-url]: https://npmjs.org/package/safer-buffer +[standard-image]: https://img.shields.io/badge/code_style-standard-brightgreen.svg +[standard-url]: https://standardjs.com +[secuirty-image]: https://img.shields.io/badge/Security-Responsible%20Disclosure-green.svg +[secuirty-url]: https://github.com/nodejs/security-wg/blob/master/processes/responsible_disclosure_template.md + +Modern Buffer API polyfill without footguns, working on Node.js from 0.8 to current. + +## How to use? + +First, port all `Buffer()` and `new Buffer()` calls to `Buffer.alloc()` and `Buffer.from()` API. + +Then, to achieve compatibility with outdated Node.js versions (`<4.5.0` and 5.x `<5.9.0`), use +`const Buffer = require('safer-buffer').Buffer` in all files where you make calls to the new +Buffer API. _Use `var` instead of `const` if you need that for your Node.js version range support._ + +Also, see the +[porting Buffer](https://github.com/ChALkeR/safer-buffer/blob/master/Porting-Buffer.md) guide. + +## Do I need it? + +Hopefully, not — dropping support for outdated Node.js versions should be fine nowdays, and that +is the recommended path forward. You _do_ need to port to the `Buffer.alloc()` and `Buffer.from()` +though. + +See the [porting guide](https://github.com/ChALkeR/safer-buffer/blob/master/Porting-Buffer.md) +for a better description. + +## Why not [safe-buffer](https://npmjs.com/safe-buffer)? + +_In short: while `safe-buffer` serves as a polyfill for the new API, it allows old API usage and +itself contains footguns._ + +`safe-buffer` could be used safely to get the new API while still keeping support for older +Node.js versions (like this module), but while analyzing ecosystem usage of the old Buffer API +I found out that `safe-buffer` is itself causing problems in some cases. + +For example, consider the following snippet: + +```console +$ cat example.unsafe.js +console.log(Buffer(20)) +$ ./node-v6.13.0-linux-x64/bin/node example.unsafe.js +<Buffer 0a 00 00 00 00 00 00 00 28 13 de 02 00 00 00 00 05 00 00 00> +$ standard example.unsafe.js +standard: Use JavaScript Standard Style (https://standardjs.com) + /home/chalker/repo/safer-buffer/example.unsafe.js:2:13: 'Buffer()' was deprecated since v6. Use 'Buffer.alloc()' or 'Buffer.from()' (use 'https://www.npmjs.com/package/safe-buffer' for '<4.5.0') instead. +``` + +This is allocates and writes to console an uninitialized chunk of memory. +[standard](https://www.npmjs.com/package/standard) linter (among others) catch that and warn people +to avoid using unsafe API. + +Let's now throw in `safe-buffer`! + +```console +$ cat example.safe-buffer.js +const Buffer = require('safe-buffer').Buffer +console.log(Buffer(20)) +$ standard example.safe-buffer.js +$ ./node-v6.13.0-linux-x64/bin/node example.safe-buffer.js +<Buffer 08 00 00 00 00 00 00 00 28 58 01 82 fe 7f 00 00 00 00 00 00> +``` + +See the problem? Adding in `safe-buffer` _magically removes the lint warning_, but the behavior +remains identiсal to what we had before, and when launched on Node.js 6.x LTS — this dumps out +chunks of uninitialized memory. +_And this code will still emit runtime warnings on Node.js 10.x and above._ + +That was done by design. I first considered changing `safe-buffer`, prohibiting old API usage or +emitting warnings on it, but that significantly diverges from `safe-buffer` design. After some +discussion, it was decided to move my approach into a separate package, and _this is that separate +package_. + +This footgun is not imaginary — I observed top-downloaded packages doing that kind of thing, +«fixing» the lint warning by blindly including `safe-buffer` without any actual changes. + +Also in some cases, even if the API _was_ migrated to use of safe Buffer API — a random pull request +can bring unsafe Buffer API usage back to the codebase by adding new calls — and that could go +unnoticed even if you have a linter prohibiting that (becase of the reason stated above), and even +pass CI. _I also observed that being done in popular packages._ + +Some examples: + * [webdriverio](https://github.com/webdriverio/webdriverio/commit/05cbd3167c12e4930f09ef7cf93b127ba4effae4#diff-124380949022817b90b622871837d56cR31) + (a module with 548 759 downloads/month), + * [websocket-stream](https://github.com/maxogden/websocket-stream/commit/c9312bd24d08271687d76da0fe3c83493871cf61) + (218 288 d/m, fix in [maxogden/websocket-stream#142](https://github.com/maxogden/websocket-stream/pull/142)), + * [node-serialport](https://github.com/node-serialport/node-serialport/commit/e8d9d2b16c664224920ce1c895199b1ce2def48c) + (113 138 d/m, fix in [node-serialport/node-serialport#1510](https://github.com/node-serialport/node-serialport/pull/1510)), + * [karma](https://github.com/karma-runner/karma/commit/3d94b8cf18c695104ca195334dc75ff054c74eec) + (3 973 193 d/m, fix in [karma-runner/karma#2947](https://github.com/karma-runner/karma/pull/2947)), + * [spdy-transport](https://github.com/spdy-http2/spdy-transport/commit/5375ac33f4a62a4f65bcfc2827447d42a5dbe8b1) + (5 970 727 d/m, fix in [spdy-http2/spdy-transport#53](https://github.com/spdy-http2/spdy-transport/pull/53)). + * And there are a lot more over the ecosystem. + +I filed a PR at +[mysticatea/eslint-plugin-node#110](https://github.com/mysticatea/eslint-plugin-node/pull/110) to +partially fix that (for cases when that lint rule is used), but it is a semver-major change for +linter rules and presets, so it would take significant time for that to reach actual setups. +_It also hasn't been released yet (2018-03-20)._ + +Also, `safer-buffer` discourages the usage of `.allocUnsafe()`, which is often done by a mistake. +It still supports it with an explicit concern barier, by placing it under +`require('safer-buffer/dangereous')`. + +## But isn't throwing bad? + +Not really. It's an error that could be noticed and fixed early, instead of causing havoc later like +unguarded `new Buffer()` calls that end up receiving user input can do. + +This package affects only the files where `var Buffer = require('safer-buffer').Buffer` was done, so +it is really simple to keep track of things and make sure that you don't mix old API usage with that. +Also, CI should hint anything that you might have missed. + +New commits, if tested, won't land new usage of unsafe Buffer API this way. +_Node.js 10.x also deals with that by printing a runtime depecation warning._ + +### Would it affect third-party modules? + +No, unless you explicitly do an awful thing like monkey-patching or overriding the built-in `Buffer`. +Don't do that. + +### But I don't want throwing… + +That is also fine! + +Also, it could be better in some cases when you don't comprehensive enough test coverage. + +In that case — just don't override `Buffer` and use +`var SaferBuffer = require('safer-buffer').Buffer` instead. + +That way, everything using `Buffer` natively would still work, but there would be two drawbacks: + +* `Buffer.from`/`Buffer.alloc` won't be polyfilled — use `SaferBuffer.from` and + `SaferBuffer.alloc` instead. +* You are still open to accidentally using the insecure deprecated API — use a linter to catch that. + +Note that using a linter to catch accidential `Buffer` constructor usage in this case is strongly +recommended. `Buffer` is not overriden in this usecase, so linters won't get confused. + +## «Without footguns»? + +Well, it is still possible to do _some_ things with `Buffer` API, e.g. accessing `.buffer` property +on older versions and duping things from there. You shouldn't do that in your code, probabably. + +The intention is to remove the most significant footguns that affect lots of packages in the +ecosystem, and to do it in the proper way. + +Also, this package doesn't protect against security issues affecting some Node.js versions, so for +usage in your own production code, it is still recommended to update to a Node.js version +[supported by upstream](https://github.com/nodejs/release#release-schedule). diff --git a/middleware/node_modules/safer-buffer/dangerous.js b/middleware/node_modules/safer-buffer/dangerous.js new file mode 100644 index 0000000..ca41fdc --- /dev/null +++ b/middleware/node_modules/safer-buffer/dangerous.js @@ -0,0 +1,58 @@ +/* eslint-disable node/no-deprecated-api */ + +'use strict' + +var buffer = require('buffer') +var Buffer = buffer.Buffer +var safer = require('./safer.js') +var Safer = safer.Buffer + +var dangerous = {} + +var key + +for (key in safer) { + if (!safer.hasOwnProperty(key)) continue + dangerous[key] = safer[key] +} + +var Dangereous = dangerous.Buffer = {} + +// Copy Safer API +for (key in Safer) { + if (!Safer.hasOwnProperty(key)) continue + Dangereous[key] = Safer[key] +} + +// Copy those missing unsafe methods, if they are present +for (key in Buffer) { + if (!Buffer.hasOwnProperty(key)) continue + if (Dangereous.hasOwnProperty(key)) continue + Dangereous[key] = Buffer[key] +} + +if (!Dangereous.allocUnsafe) { + Dangereous.allocUnsafe = function (size) { + if (typeof size !== 'number') { + throw new TypeError('The "size" argument must be of type number. Received type ' + typeof size) + } + if (size < 0 || size >= 2 * (1 << 30)) { + throw new RangeError('The value "' + size + '" is invalid for option "size"') + } + return Buffer(size) + } +} + +if (!Dangereous.allocUnsafeSlow) { + Dangereous.allocUnsafeSlow = function (size) { + if (typeof size !== 'number') { + throw new TypeError('The "size" argument must be of type number. Received type ' + typeof size) + } + if (size < 0 || size >= 2 * (1 << 30)) { + throw new RangeError('The value "' + size + '" is invalid for option "size"') + } + return buffer.SlowBuffer(size) + } +} + +module.exports = dangerous diff --git a/middleware/node_modules/safer-buffer/package.json b/middleware/node_modules/safer-buffer/package.json new file mode 100644 index 0000000..d452b04 --- /dev/null +++ b/middleware/node_modules/safer-buffer/package.json @@ -0,0 +1,34 @@ +{ + "name": "safer-buffer", + "version": "2.1.2", + "description": "Modern Buffer API polyfill without footguns", + "main": "safer.js", + "scripts": { + "browserify-test": "browserify --external tape tests.js > browserify-tests.js && tape browserify-tests.js", + "test": "standard && tape tests.js" + }, + "author": { + "name": "Nikita Skovoroda", + "email": "chalkerx@gmail.com", + "url": "https://github.com/ChALkeR" + }, + "license": "MIT", + "repository": { + "type": "git", + "url": "git+https://github.com/ChALkeR/safer-buffer.git" + }, + "bugs": { + "url": "https://github.com/ChALkeR/safer-buffer/issues" + }, + "devDependencies": { + "standard": "^11.0.1", + "tape": "^4.9.0" + }, + "files": [ + "Porting-Buffer.md", + "Readme.md", + "tests.js", + "dangerous.js", + "safer.js" + ] +} diff --git a/middleware/node_modules/safer-buffer/safer.js b/middleware/node_modules/safer-buffer/safer.js new file mode 100644 index 0000000..37c7e1a --- /dev/null +++ b/middleware/node_modules/safer-buffer/safer.js @@ -0,0 +1,77 @@ +/* eslint-disable node/no-deprecated-api */ + +'use strict' + +var buffer = require('buffer') +var Buffer = buffer.Buffer + +var safer = {} + +var key + +for (key in buffer) { + if (!buffer.hasOwnProperty(key)) continue + if (key === 'SlowBuffer' || key === 'Buffer') continue + safer[key] = buffer[key] +} + +var Safer = safer.Buffer = {} +for (key in Buffer) { + if (!Buffer.hasOwnProperty(key)) continue + if (key === 'allocUnsafe' || key === 'allocUnsafeSlow') continue + Safer[key] = Buffer[key] +} + +safer.Buffer.prototype = Buffer.prototype + +if (!Safer.from || Safer.from === Uint8Array.from) { + Safer.from = function (value, encodingOrOffset, length) { + if (typeof value === 'number') { + throw new TypeError('The "value" argument must not be of type number. Received type ' + typeof value) + } + if (value && typeof value.length === 'undefined') { + throw new TypeError('The first argument must be one of type string, Buffer, ArrayBuffer, Array, or Array-like Object. Received type ' + typeof value) + } + return Buffer(value, encodingOrOffset, length) + } +} + +if (!Safer.alloc) { + Safer.alloc = function (size, fill, encoding) { + if (typeof size !== 'number') { + throw new TypeError('The "size" argument must be of type number. Received type ' + typeof size) + } + if (size < 0 || size >= 2 * (1 << 30)) { + throw new RangeError('The value "' + size + '" is invalid for option "size"') + } + var buf = Buffer(size) + if (!fill || fill.length === 0) { + buf.fill(0) + } else if (typeof encoding === 'string') { + buf.fill(fill, encoding) + } else { + buf.fill(fill) + } + return buf + } +} + +if (!safer.kStringMaxLength) { + try { + safer.kStringMaxLength = process.binding('buffer').kStringMaxLength + } catch (e) { + // we can't determine kStringMaxLength in environments where process.binding + // is unsupported, so let's not set it + } +} + +if (!safer.constants) { + safer.constants = { + MAX_LENGTH: safer.kMaxLength + } + if (safer.kStringMaxLength) { + safer.constants.MAX_STRING_LENGTH = safer.kStringMaxLength + } +} + +module.exports = safer diff --git a/middleware/node_modules/safer-buffer/tests.js b/middleware/node_modules/safer-buffer/tests.js new file mode 100644 index 0000000..7ed2777 --- /dev/null +++ b/middleware/node_modules/safer-buffer/tests.js @@ -0,0 +1,406 @@ +/* eslint-disable node/no-deprecated-api */ + +'use strict' + +var test = require('tape') + +var buffer = require('buffer') + +var index = require('./') +var safer = require('./safer') +var dangerous = require('./dangerous') + +/* Inheritance tests */ + +test('Default is Safer', function (t) { + t.equal(index, safer) + t.notEqual(safer, dangerous) + t.notEqual(index, dangerous) + t.end() +}) + +test('Is not a function', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(typeof impl, 'object') + t.equal(typeof impl.Buffer, 'object') + }); + [buffer].forEach(function (impl) { + t.equal(typeof impl, 'object') + t.equal(typeof impl.Buffer, 'function') + }) + t.end() +}) + +test('Constructor throws', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.throws(function () { impl.Buffer() }) + t.throws(function () { impl.Buffer(0) }) + t.throws(function () { impl.Buffer('a') }) + t.throws(function () { impl.Buffer('a', 'utf-8') }) + t.throws(function () { return new impl.Buffer() }) + t.throws(function () { return new impl.Buffer(0) }) + t.throws(function () { return new impl.Buffer('a') }) + t.throws(function () { return new impl.Buffer('a', 'utf-8') }) + }) + t.end() +}) + +test('Safe methods exist', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(typeof impl.Buffer.alloc, 'function', 'alloc') + t.equal(typeof impl.Buffer.from, 'function', 'from') + }) + t.end() +}) + +test('Unsafe methods exist only in Dangerous', function (t) { + [index, safer].forEach(function (impl) { + t.equal(typeof impl.Buffer.allocUnsafe, 'undefined') + t.equal(typeof impl.Buffer.allocUnsafeSlow, 'undefined') + }); + [dangerous].forEach(function (impl) { + t.equal(typeof impl.Buffer.allocUnsafe, 'function') + t.equal(typeof impl.Buffer.allocUnsafeSlow, 'function') + }) + t.end() +}) + +test('Generic methods/properties are defined and equal', function (t) { + ['poolSize', 'isBuffer', 'concat', 'byteLength'].forEach(function (method) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer[method], buffer.Buffer[method], method) + t.notEqual(typeof impl.Buffer[method], 'undefined', method) + }) + }) + t.end() +}) + +test('Built-in buffer static methods/properties are inherited', function (t) { + Object.keys(buffer).forEach(function (method) { + if (method === 'SlowBuffer' || method === 'Buffer') return; + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl[method], buffer[method], method) + t.notEqual(typeof impl[method], 'undefined', method) + }) + }) + t.end() +}) + +test('Built-in Buffer static methods/properties are inherited', function (t) { + Object.keys(buffer.Buffer).forEach(function (method) { + if (method === 'allocUnsafe' || method === 'allocUnsafeSlow') return; + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer[method], buffer.Buffer[method], method) + t.notEqual(typeof impl.Buffer[method], 'undefined', method) + }) + }) + t.end() +}) + +test('.prototype property of Buffer is inherited', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer.prototype, buffer.Buffer.prototype, 'prototype') + t.notEqual(typeof impl.Buffer.prototype, 'undefined', 'prototype') + }) + t.end() +}) + +test('All Safer methods are present in Dangerous', function (t) { + Object.keys(safer).forEach(function (method) { + if (method === 'Buffer') return; + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl[method], safer[method], method) + if (method !== 'kStringMaxLength') { + t.notEqual(typeof impl[method], 'undefined', method) + } + }) + }) + Object.keys(safer.Buffer).forEach(function (method) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer[method], safer.Buffer[method], method) + t.notEqual(typeof impl.Buffer[method], 'undefined', method) + }) + }) + t.end() +}) + +test('Safe methods from Dangerous methods are present in Safer', function (t) { + Object.keys(dangerous).forEach(function (method) { + if (method === 'Buffer') return; + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl[method], dangerous[method], method) + if (method !== 'kStringMaxLength') { + t.notEqual(typeof impl[method], 'undefined', method) + } + }) + }) + Object.keys(dangerous.Buffer).forEach(function (method) { + if (method === 'allocUnsafe' || method === 'allocUnsafeSlow') return; + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer[method], dangerous.Buffer[method], method) + t.notEqual(typeof impl.Buffer[method], 'undefined', method) + }) + }) + t.end() +}) + +/* Behaviour tests */ + +test('Methods return Buffers', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.ok(buffer.Buffer.isBuffer(impl.Buffer.alloc(0))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.alloc(0, 10))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.alloc(0, 'a'))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.alloc(10))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.alloc(10, 'x'))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.alloc(9, 'ab'))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from(''))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from('string'))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from('string', 'utf-8'))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from('b25ldHdvdGhyZWU=', 'base64'))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from([0, 42, 3]))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from(new Uint8Array([0, 42, 3])))) + t.ok(buffer.Buffer.isBuffer(impl.Buffer.from([]))) + }); + ['allocUnsafe', 'allocUnsafeSlow'].forEach(function (method) { + t.ok(buffer.Buffer.isBuffer(dangerous.Buffer[method](0))) + t.ok(buffer.Buffer.isBuffer(dangerous.Buffer[method](10))) + }) + t.end() +}) + +test('Constructor is buffer.Buffer', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer.alloc(0).constructor, buffer.Buffer) + t.equal(impl.Buffer.alloc(0, 10).constructor, buffer.Buffer) + t.equal(impl.Buffer.alloc(0, 'a').constructor, buffer.Buffer) + t.equal(impl.Buffer.alloc(10).constructor, buffer.Buffer) + t.equal(impl.Buffer.alloc(10, 'x').constructor, buffer.Buffer) + t.equal(impl.Buffer.alloc(9, 'ab').constructor, buffer.Buffer) + t.equal(impl.Buffer.from('').constructor, buffer.Buffer) + t.equal(impl.Buffer.from('string').constructor, buffer.Buffer) + t.equal(impl.Buffer.from('string', 'utf-8').constructor, buffer.Buffer) + t.equal(impl.Buffer.from('b25ldHdvdGhyZWU=', 'base64').constructor, buffer.Buffer) + t.equal(impl.Buffer.from([0, 42, 3]).constructor, buffer.Buffer) + t.equal(impl.Buffer.from(new Uint8Array([0, 42, 3])).constructor, buffer.Buffer) + t.equal(impl.Buffer.from([]).constructor, buffer.Buffer) + }); + [0, 10, 100].forEach(function (arg) { + t.equal(dangerous.Buffer.allocUnsafe(arg).constructor, buffer.Buffer) + t.equal(dangerous.Buffer.allocUnsafeSlow(arg).constructor, buffer.SlowBuffer(0).constructor) + }) + t.end() +}) + +test('Invalid calls throw', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.throws(function () { impl.Buffer.from(0) }) + t.throws(function () { impl.Buffer.from(10) }) + t.throws(function () { impl.Buffer.from(10, 'utf-8') }) + t.throws(function () { impl.Buffer.from('string', 'invalid encoding') }) + t.throws(function () { impl.Buffer.from(-10) }) + t.throws(function () { impl.Buffer.from(1e90) }) + t.throws(function () { impl.Buffer.from(Infinity) }) + t.throws(function () { impl.Buffer.from(-Infinity) }) + t.throws(function () { impl.Buffer.from(NaN) }) + t.throws(function () { impl.Buffer.from(null) }) + t.throws(function () { impl.Buffer.from(undefined) }) + t.throws(function () { impl.Buffer.from() }) + t.throws(function () { impl.Buffer.from({}) }) + t.throws(function () { impl.Buffer.alloc('') }) + t.throws(function () { impl.Buffer.alloc('string') }) + t.throws(function () { impl.Buffer.alloc('string', 'utf-8') }) + t.throws(function () { impl.Buffer.alloc('b25ldHdvdGhyZWU=', 'base64') }) + t.throws(function () { impl.Buffer.alloc(-10) }) + t.throws(function () { impl.Buffer.alloc(1e90) }) + t.throws(function () { impl.Buffer.alloc(2 * (1 << 30)) }) + t.throws(function () { impl.Buffer.alloc(Infinity) }) + t.throws(function () { impl.Buffer.alloc(-Infinity) }) + t.throws(function () { impl.Buffer.alloc(null) }) + t.throws(function () { impl.Buffer.alloc(undefined) }) + t.throws(function () { impl.Buffer.alloc() }) + t.throws(function () { impl.Buffer.alloc([]) }) + t.throws(function () { impl.Buffer.alloc([0, 42, 3]) }) + t.throws(function () { impl.Buffer.alloc({}) }) + }); + ['allocUnsafe', 'allocUnsafeSlow'].forEach(function (method) { + t.throws(function () { dangerous.Buffer[method]('') }) + t.throws(function () { dangerous.Buffer[method]('string') }) + t.throws(function () { dangerous.Buffer[method]('string', 'utf-8') }) + t.throws(function () { dangerous.Buffer[method](2 * (1 << 30)) }) + t.throws(function () { dangerous.Buffer[method](Infinity) }) + if (dangerous.Buffer[method] === buffer.Buffer.allocUnsafe) { + t.skip('Skipping, older impl of allocUnsafe coerced negative sizes to 0') + } else { + t.throws(function () { dangerous.Buffer[method](-10) }) + t.throws(function () { dangerous.Buffer[method](-1e90) }) + t.throws(function () { dangerous.Buffer[method](-Infinity) }) + } + t.throws(function () { dangerous.Buffer[method](null) }) + t.throws(function () { dangerous.Buffer[method](undefined) }) + t.throws(function () { dangerous.Buffer[method]() }) + t.throws(function () { dangerous.Buffer[method]([]) }) + t.throws(function () { dangerous.Buffer[method]([0, 42, 3]) }) + t.throws(function () { dangerous.Buffer[method]({}) }) + }) + t.end() +}) + +test('Buffers have appropriate lengths', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.equal(impl.Buffer.alloc(0).length, 0) + t.equal(impl.Buffer.alloc(10).length, 10) + t.equal(impl.Buffer.from('').length, 0) + t.equal(impl.Buffer.from('string').length, 6) + t.equal(impl.Buffer.from('string', 'utf-8').length, 6) + t.equal(impl.Buffer.from('b25ldHdvdGhyZWU=', 'base64').length, 11) + t.equal(impl.Buffer.from([0, 42, 3]).length, 3) + t.equal(impl.Buffer.from(new Uint8Array([0, 42, 3])).length, 3) + t.equal(impl.Buffer.from([]).length, 0) + }); + ['allocUnsafe', 'allocUnsafeSlow'].forEach(function (method) { + t.equal(dangerous.Buffer[method](0).length, 0) + t.equal(dangerous.Buffer[method](10).length, 10) + }) + t.end() +}) + +test('Buffers have appropriate lengths (2)', function (t) { + t.equal(index.Buffer.alloc, safer.Buffer.alloc) + t.equal(index.Buffer.alloc, dangerous.Buffer.alloc) + var ok = true; + [ safer.Buffer.alloc, + dangerous.Buffer.allocUnsafe, + dangerous.Buffer.allocUnsafeSlow + ].forEach(function (method) { + for (var i = 0; i < 1e2; i++) { + var length = Math.round(Math.random() * 1e5) + var buf = method(length) + if (!buffer.Buffer.isBuffer(buf)) ok = false + if (buf.length !== length) ok = false + } + }) + t.ok(ok) + t.end() +}) + +test('.alloc(size) is zero-filled and has correct length', function (t) { + t.equal(index.Buffer.alloc, safer.Buffer.alloc) + t.equal(index.Buffer.alloc, dangerous.Buffer.alloc) + var ok = true + for (var i = 0; i < 1e2; i++) { + var length = Math.round(Math.random() * 2e6) + var buf = index.Buffer.alloc(length) + if (!buffer.Buffer.isBuffer(buf)) ok = false + if (buf.length !== length) ok = false + var j + for (j = 0; j < length; j++) { + if (buf[j] !== 0) ok = false + } + buf.fill(1) + for (j = 0; j < length; j++) { + if (buf[j] !== 1) ok = false + } + } + t.ok(ok) + t.end() +}) + +test('.allocUnsafe / .allocUnsafeSlow are fillable and have correct lengths', function (t) { + ['allocUnsafe', 'allocUnsafeSlow'].forEach(function (method) { + var ok = true + for (var i = 0; i < 1e2; i++) { + var length = Math.round(Math.random() * 2e6) + var buf = dangerous.Buffer[method](length) + if (!buffer.Buffer.isBuffer(buf)) ok = false + if (buf.length !== length) ok = false + buf.fill(0, 0, length) + var j + for (j = 0; j < length; j++) { + if (buf[j] !== 0) ok = false + } + buf.fill(1, 0, length) + for (j = 0; j < length; j++) { + if (buf[j] !== 1) ok = false + } + } + t.ok(ok, method) + }) + t.end() +}) + +test('.alloc(size, fill) is `fill`-filled', function (t) { + t.equal(index.Buffer.alloc, safer.Buffer.alloc) + t.equal(index.Buffer.alloc, dangerous.Buffer.alloc) + var ok = true + for (var i = 0; i < 1e2; i++) { + var length = Math.round(Math.random() * 2e6) + var fill = Math.round(Math.random() * 255) + var buf = index.Buffer.alloc(length, fill) + if (!buffer.Buffer.isBuffer(buf)) ok = false + if (buf.length !== length) ok = false + for (var j = 0; j < length; j++) { + if (buf[j] !== fill) ok = false + } + } + t.ok(ok) + t.end() +}) + +test('.alloc(size, fill) is `fill`-filled', function (t) { + t.equal(index.Buffer.alloc, safer.Buffer.alloc) + t.equal(index.Buffer.alloc, dangerous.Buffer.alloc) + var ok = true + for (var i = 0; i < 1e2; i++) { + var length = Math.round(Math.random() * 2e6) + var fill = Math.round(Math.random() * 255) + var buf = index.Buffer.alloc(length, fill) + if (!buffer.Buffer.isBuffer(buf)) ok = false + if (buf.length !== length) ok = false + for (var j = 0; j < length; j++) { + if (buf[j] !== fill) ok = false + } + } + t.ok(ok) + t.deepEqual(index.Buffer.alloc(9, 'a'), index.Buffer.alloc(9, 97)) + t.notDeepEqual(index.Buffer.alloc(9, 'a'), index.Buffer.alloc(9, 98)) + + var tmp = new buffer.Buffer(2) + tmp.fill('ok') + if (tmp[1] === tmp[0]) { + // Outdated Node.js + t.deepEqual(index.Buffer.alloc(5, 'ok'), index.Buffer.from('ooooo')) + } else { + t.deepEqual(index.Buffer.alloc(5, 'ok'), index.Buffer.from('okoko')) + } + t.notDeepEqual(index.Buffer.alloc(5, 'ok'), index.Buffer.from('kokok')) + + t.end() +}) + +test('safer.Buffer.from returns results same as Buffer constructor', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.deepEqual(impl.Buffer.from(''), new buffer.Buffer('')) + t.deepEqual(impl.Buffer.from('string'), new buffer.Buffer('string')) + t.deepEqual(impl.Buffer.from('string', 'utf-8'), new buffer.Buffer('string', 'utf-8')) + t.deepEqual(impl.Buffer.from('b25ldHdvdGhyZWU=', 'base64'), new buffer.Buffer('b25ldHdvdGhyZWU=', 'base64')) + t.deepEqual(impl.Buffer.from([0, 42, 3]), new buffer.Buffer([0, 42, 3])) + t.deepEqual(impl.Buffer.from(new Uint8Array([0, 42, 3])), new buffer.Buffer(new Uint8Array([0, 42, 3]))) + t.deepEqual(impl.Buffer.from([]), new buffer.Buffer([])) + }) + t.end() +}) + +test('safer.Buffer.from returns consistent results', function (t) { + [index, safer, dangerous].forEach(function (impl) { + t.deepEqual(impl.Buffer.from(''), impl.Buffer.alloc(0)) + t.deepEqual(impl.Buffer.from([]), impl.Buffer.alloc(0)) + t.deepEqual(impl.Buffer.from(new Uint8Array([])), impl.Buffer.alloc(0)) + t.deepEqual(impl.Buffer.from('string', 'utf-8'), impl.Buffer.from('string')) + t.deepEqual(impl.Buffer.from('string'), impl.Buffer.from([115, 116, 114, 105, 110, 103])) + t.deepEqual(impl.Buffer.from('string'), impl.Buffer.from(impl.Buffer.from('string'))) + t.deepEqual(impl.Buffer.from('b25ldHdvdGhyZWU=', 'base64'), impl.Buffer.from('onetwothree')) + t.notDeepEqual(impl.Buffer.from('b25ldHdvdGhyZWU='), impl.Buffer.from('onetwothree')) + }) + t.end() +}) |