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fix: external node in Firefox 85+ #957

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Jan 7, 2021
Merged

fix: external node in Firefox 85+ #957

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73 changes: 46 additions & 27 deletions add-on/src/lib/ipfs-request.js
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Original file line number Diff line number Diff line change
Expand Up @@ -33,7 +33,24 @@ const onHeadersReceivedRedirect = new Set()
function createRequestModifier (getState, dnslinkResolver, ipfsPathValidator, runtime) {
const browser = runtime.browser
const runtimeRoot = browser.runtime.getURL('/')
const webExtensionOrigin = runtimeRoot ? new URL(runtimeRoot).origin : 'null'
const webExtensionOrigin = runtimeRoot ? new URL(runtimeRoot).origin : 'http://companion-origin' // avoid 'null' because it has special meaning
const isCompanionRequest = (request) => {
// We inspect webRequest object (WebExtension API) instead of Origin HTTP
// header because the value of the latter changed over the years ad
// absurdum. It leaks the unique extension ID and no vendor seem to have
// coherent policy around it, Firefox and Chromium flip back and forth:
// Firefox Nightly 65 sets moz-extension://{extension-installation-id}
// Chromium <72 sets null
// Chromium Beta 72 sets chrome-extension://{uid}
// Firefox Nightly 85 sets null
const { originUrl, initiator } = request
// Of course, getting "Origin" is vendor-specific:
// FF: originUrl (Referer-like Origin URL with path)
// Chromium: initiator (just Origin, no path)
// Because of this mess, we normalize Origin by reading it from URL.origin
const { origin } = new URL(originUrl || initiator || 'http://missing-origin')
return origin === webExtensionOrigin
}

// Various types of requests are identified once and cached across all browser.webRequest hooks
const requestCacheCfg = { max: 128, maxAge: 1000 * 30 }
Expand Down Expand Up @@ -192,32 +209,34 @@ function createRequestModifier (getState, dnslinkResolver, ipfsPathValidator, ru
// Special handling of requests made to API
if (sameGateway(request.url, state.apiURL)) {
const { requestHeaders } = request
// '403 - Forbidden' fix for Chrome and Firefox
// --------------------------------------------
// We update "Origin: *-extension://" HTTP headers in requests made to API
// by js-ipfs-http-client running in the background page of browser
// extension. Without this, some users would need to do manual CORS
// whitelisting by adding "..extension://<UUID>" to
// API.HTTPHeaders.Access-Control-Allow-Origin in go-ipfs config.
// With this, API calls made by browser extension look like ones made
// by webui loaded from the API port.
// More info:
// Firefox: https://github.com/ipfs-shipyard/ipfs-companion/issues/622
// Chromium 71: https://github.com/ipfs-shipyard/ipfs-companion/pull/616
// Chromium 72: https://github.com/ipfs-shipyard/ipfs-companion/issues/630

// Firefox Nightly 65 sets moz-extension://{extension-installation-id}
// Chromium Beta 72 sets chrome-extension://{uid}
const isWebExtensionOrigin = (origin) =>
origin &&
(origin.startsWith('moz-extension://') ||
origin.startsWith('chrome-extension://')) &&
new URL(origin).origin === webExtensionOrigin

// Replace Origin header matching webExtensionOrigin with API one
const foundAt = requestHeaders.findIndex(h => h.name === 'Origin' && isWebExtensionOrigin(h.value))
if (foundAt > -1) {
requestHeaders[foundAt].value = state.apiURL.origin

if (isCompanionRequest(request)) {
// '403 - Forbidden' fix for Chrome and Firefox
// --------------------------------------------
// We update "Origin: *-extension://" HTTP headers in requests made to API
// by js-ipfs-http-client running in the background page of browser
// extension. Without this, some users would need to do manual CORS
// whitelisting by adding "..extension://<UUID>" to
// API.HTTPHeaders.Access-Control-Allow-Origin in go-ipfs config.
// With this, API calls made by browser extension look like ones made
// by webui loaded from the API port.
// More info:
// Firefox 65: https://github.com/ipfs-shipyard/ipfs-companion/issues/622
// Firefox 85: https://github.com/ipfs-shipyard/ipfs-companion/issues/955
// Chromium 71: https://github.com/ipfs-shipyard/ipfs-companion/pull/616
// Chromium 72: https://github.com/ipfs-shipyard/ipfs-companion/issues/630
const foundAt = requestHeaders.findIndex(h => h.name.toLowerCase() === 'origin')
const { origin } = state.apiURL
if (foundAt > -1) {
// Replace existing Origin with the origin of the API itself.
// This removes the need for CORS setup in go-ipfs config and
// ensures there is no HTTP Error 403 Forbidden.
requestHeaders[foundAt].value = origin
} else { // future-proofing
// Origin is missing, and go-ipfs requires it in browsers:
// https://github.com/ipfs/go-ipfs-cmds/pull/193
requestHeaders.push({ name: 'Origin', value: origin })
}
}

// Fix "http: invalid Read on closed Body"
Expand Down
150 changes: 123 additions & 27 deletions test/functional/lib/ipfs-request-workarounds.test.js
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Original file line number Diff line number Diff line change
Expand Up @@ -16,20 +16,12 @@ describe('modifyRequest processing', function () {
let state, getState, dnslinkResolver, ipfsPathValidator, modifyRequest, runtime

before(function () {
// stub URL.origin in test context to return something other than null
Object.defineProperty(URL.prototype, 'origin', {
get: function () {
const fakeOrigin = this.href.split('/')
if (fakeOrigin.length >= 3) {
return fakeOrigin.slice(0, 3).join('/')
}
}
})
global.URL = URL
global.browser = browser
})

beforeEach(async function () {
browser.runtime.getURL.flush()
state = initState(optionDefaults)
getState = () => state
const getIpfs = () => {}
Expand Down Expand Up @@ -105,72 +97,176 @@ describe('modifyRequest processing', function () {
})
})

describe('a request to <apiURL>/api/v0/ made with extension:// Origin', function () {
it('should have it replaced with API one if Origin: moz-extension://{extension-installation-id}', async function () {
// The Origin header set by browser for requests coming from within a browser
// extension has been a mess for years, and by now we simply have zero trust
// in stability of this header. Instead, we use WebExtension's webRequest API
// to tell if a request comes from our browser extension and manually set
// Origin to look like a request coming from the same Origin as IPFS API.
//
// The full context can be found in ipfs-request.js, where isCompanionRequest
// check is executed.
describe('Origin header in a request to <apiURL>/api/v0/', function () {
it('set to API if request comes from Companion in Firefox <85', async function () {
// Context: Firefox 65 started setting this header
// set vendor-specific Origin for WebExtension context
browser.runtime.getURL.withArgs('/').returns('moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const bogusOriginHeader = { name: 'Origin', value: 'moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df' }
const originalOriginHeader = { name: 'Origin', value: 'moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df' }
const apiOriginHeader = { name: 'Origin', value: getState().apiURL.origin }
const request = {
requestHeaders: [originalOriginHeader],
originUrl: 'moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df/path/to/background.html', // FF specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(apiOriginHeader)
})

it('set to API if request comes from Companion in Firefox 85', async function () {
// Context: https://github.com/ipfs-shipyard/ipfs-companion/issues/955#issuecomment-753413988
browser.runtime.getURL.withArgs('/').returns('moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const originalOriginHeader = { name: 'Origin', value: 'null' }
const apiOriginHeader = { name: 'Origin', value: getState().apiURL.origin }
const request = {
requestHeaders: [originalOriginHeader],
originUrl: 'moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df/path/to/background.html', // FF specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(apiOriginHeader)
})

it('set to API if request comes from Companion in Chromium <72', async function () {
// set vendor-specific Origin for WebExtension context
browser.runtime.getURL.withArgs('/').returns('chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const bogusOriginHeader = { name: 'Origin', value: 'null' }
const apiOriginHeader = { name: 'Origin', value: getState().apiURL.origin }
const request = {
requestHeaders: [bogusOriginHeader],
initiator: 'chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch/', // Chromium specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(apiOriginHeader)
browser.runtime.getURL.flush()
})
})

describe('should have it removed if Origin: chrome-extension://{extension-installation-id}', function () {
it('should have it swapped with API one if Origin: with chrome-extension://', async function () {
// Context: Chromium 72 started setting this header
it('set to API if request comes from Companion in Chromium 72', async function () {
// Context: Chromium 72 started setting this header to chrome-extension:// URI
// set vendor-specific Origin for WebExtension context
browser.runtime.getURL.withArgs('/').returns('chrome-extension://trolrorlrorlrol/')
browser.runtime.getURL.withArgs('/').returns('chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const bogusOriginHeader = { name: 'Origin', value: 'chrome-extension://trolrorlrorlrol' }
const bogusOriginHeader = { name: 'Origin', value: 'chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch' }
const apiOriginHeader = { name: 'Origin', value: getState().apiURL.origin }
const request = {
requestHeaders: [bogusOriginHeader],
initiator: 'chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch/', // Chromium specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(apiOriginHeader)
browser.runtime.getURL.flush()
})
})

describe('a request to <apiURL>/api/v0/ with Origin=null', function () {
it('should keep the "Origin: null" header ', async function () {
it('keep Origin as-is if request does not come from Companion (Chromium)', async function () {
browser.runtime.getURL.withArgs('/').returns('chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const originHeader = { name: 'Origin', value: 'https://some.website.example.com' }
const expectedOriginHeader = { name: 'Origin', value: 'https://some.website.example.com' }
const request = {
requestHeaders: [originHeader],
initiator: 'https://some.website.example.com', // Chromium specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(expectedOriginHeader)
})

it('keep Origin as-is if request does not come from Companion (Firefox)', async function () {
browser.runtime.getURL.withArgs('/').returns('moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const originHeader = { name: 'Origin', value: 'https://some.website.example.com' }
const expectedOriginHeader = { name: 'Origin', value: 'https://some.website.example.com' }
const request = {
requestHeaders: [originHeader],
originUrl: 'https://some.website.example.com/some/path.html', // Firefox specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(expectedOriginHeader)
})

it('keep the "Origin: null" if request does not come from Companion (Chromium)', async function () {
// Presence of Origin header is important as it protects API from XSS via sandboxed iframe
// NOTE: Chromium <72 was setting this header in requests sent by browser extension,
// but they fixed it since then.
browser.runtime.getURL.withArgs('/').returns(undefined)
// but they fixed it since then, and we switched to reading origin via webRequest API,
// which is independent from the HTTP header.
browser.runtime.getURL.withArgs('/').returns('chrome-extension://nibjojkomfdiaoajekhjakgkdhaomnch/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const nullOriginHeader = { name: 'Origin', value: 'null' }
const expectedOriginHeader = { name: 'Origin', value: 'null' }
const request = {
requestHeaders: [nullOriginHeader],
initiator: 'https://random.website.example.com', // Chromium specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(expectedOriginHeader)
})

it('keep the "Origin: null" if request does not come from Companion (Firefox)', async function () {
// Presence of Origin header is important as it protects API from XSS via sandboxed iframe
browser.runtime.getURL.withArgs('/').returns('moz-extension://0f334731-19e3-42f8-85e2-03dbf50026df/')
// ensure clean modifyRequest
runtime = Object.assign({}, await createRuntimeChecks(browser)) // make it mutable for tests
modifyRequest = createRequestModifier(getState, dnslinkResolver, ipfsPathValidator, runtime)
// test
const nullOriginHeader = { name: 'Origin', value: 'null' }
const expectedOriginHeader = { name: 'Origin', value: 'null' }
const request = {
requestHeaders: [nullOriginHeader],
originUrl: 'https://random.website.example.com/some/path.html', // Firefox specific WebExtension API
type: 'xmlhttprequest',
url: `${state.apiURLString}api/v0/id`
}
modifyRequest.onBeforeRequest(request) // executes before onBeforeSendHeaders, may mutate state
expect(modifyRequest.onBeforeSendHeaders(request).requestHeaders)
.to.deep.include(nullOriginHeader)
browser.runtime.getURL.flush()
.to.deep.include(expectedOriginHeader)
})
})

Expand Down