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fix: properly replace integrity tags in script resources when experimentalModifyObstructiveThirdPartyCode is true #23820

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merged 10 commits into from
Sep 20, 2022
Merged

fix: properly replace integrity tags in script resources when experimentalModifyObstructiveThirdPartyCode is true #23820

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7938770
test: add failing unit test for expected behavior
AtofStryker Sep 12, 2022
d552648
fix: add regex to strip out dynamic setAttribute integrity setting wh…
AtofStryker Sep 13, 2022
a980815
fix: properly replace integrity tags inside script resources when exp…
AtofStryker Sep 13, 2022
505fa80
test: fix regex rewritter to handle a few other cases of rewriting
AtofStryker Sep 17, 2022
700c75e
rename html integrity re to general as this replaces both html and ja…
AtofStryker Sep 17, 2022
8cce83d
Merge branch 'develop' into fix/stripped-integrity-dynamic
AtofStryker Sep 19, 2022
ce714b0
Merge branch 'develop' into fix/stripped-integrity-dynamic
AtofStryker Sep 20, 2022
81650c2
chore: rephrase comments in regex rewriter for MO third party code
AtofStryker Sep 20, 2022
bf186e5
Merge branch 'fix/stripped-integrity-dynamic' of github.com:cypress-i…
AtofStryker Sep 20, 2022
d7a3839
Merge branch 'develop' of github.com:cypress-io/cypress into fix/stri…
AtofStryker Sep 20, 2022
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23 changes: 18 additions & 5 deletions packages/proxy/lib/http/util/regex-rewriter.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -16,8 +16,18 @@ const topOrParentLocationOrFramesRe = /([^\da-zA-Z\(\)])?(\btop\b|\bparent\b)([.

const jiraTopWindowGetterRe = /(!function\s*\((\w{1})\)\s*{\s*return\s*\w{1}\s*(?:={2,})\s*\w{1}\.parent)(\s*}\(\w{1}\))/g
const jiraTopWindowGetterUnMinifiedRe = /(function\s*\w{1,}\s*\((\w{1})\)\s*{\s*return\s*\w{1}\s*(?:={2,})\s*\w{1}\.parent)(\s*;\s*})/g

const integrityTagReplacementRe = new RegExp(`(${STRIPPED_INTEGRITY_TAG}|integrity)(=(?:\"|\')sha(?:256|384|512)-.*?(?:\"|\'))`, 'g')
/**
* Matches the word integrity if being set on an object, such as foo.integrity. This MUST be followed by a valid hash to match. This is replaced with
* foo['cypress-stripped-integrity']
*/
const javaScriptIntegrityReplacementRe = new RegExp(`[\\.](${STRIPPED_INTEGRITY_TAG}|integrity)((\\s?=\\s?)(?:"|')sha(?:256|384|512)-.*?(?:"|'))`, 'g')
/**
* Does a negative lookback to see a variable is being declared, such as var let or const (the 'nst' is back end of 'const' since lookbacks need a fixed width). This can then
* be followed by any optional character that isn't a period, space, single or double quote. This MUST be followed by a valid hash to match. A space preceding the integrity tag can still be matched,
* but the match only starts at the word integrity, and not the character preceding it. In these cases, we always replace the word integrity with cypress-stripped-integrity.
* The match for cypress-stripped-integrity is if we are replacing in the stripStream, and the replaced text is rematched to essentially complete a no op
*/
const generalIntegrityReplacementRe = new RegExp(`(?:(?<!(var|let|nst)\\s)[^\\.\\s'"]?)(${STRIPPED_INTEGRITY_TAG}|integrity)((?:'|")?\\]?(\\s?=|["|'],)\\s?(?:"|')sha(?:256|384|512)-.*?(?:"|'))`, 'g')

export function strip (html: string, { modifyObstructiveThirdPartyCode }: Partial<SecurityOpts> = {
modifyObstructiveThirdPartyCode: false,
Expand All @@ -30,7 +40,8 @@ export function strip (html: string, { modifyObstructiveThirdPartyCode }: Partia
.replace(jiraTopWindowGetterUnMinifiedRe, '$1 || $2.parent.__Cypress__$3')

if (modifyObstructiveThirdPartyCode) {
rewrittenHTML = rewrittenHTML.replace(integrityTagReplacementRe, `${STRIPPED_INTEGRITY_TAG}$2`)
rewrittenHTML = rewrittenHTML.replace(javaScriptIntegrityReplacementRe, `['${STRIPPED_INTEGRITY_TAG}']$2`)
rewrittenHTML = rewrittenHTML.replace(generalIntegrityReplacementRe, `${STRIPPED_INTEGRITY_TAG}$3`)
}

return rewrittenHTML
Expand All @@ -49,7 +60,8 @@ export function stripStream ({ modifyObstructiveThirdPartyCode }: Partial<Securi
jiraTopWindowGetterRe,
jiraTopWindowGetterUnMinifiedRe,
...(modifyObstructiveThirdPartyCode ? [
integrityTagReplacementRe,
javaScriptIntegrityReplacementRe,
generalIntegrityReplacementRe,
] : []),
],
[
Expand All @@ -59,7 +71,8 @@ export function stripStream ({ modifyObstructiveThirdPartyCode }: Partial<Securi
'$1 || $2.parent.__Cypress__$3',
'$1 || $2.parent.__Cypress__$3',
...(modifyObstructiveThirdPartyCode ? [
`${STRIPPED_INTEGRITY_TAG}$2`,
`['${STRIPPED_INTEGRITY_TAG}']$2`,
`${STRIPPED_INTEGRITY_TAG}$3`,
] : []),
],
),
Expand Down
28 changes: 25 additions & 3 deletions packages/proxy/test/unit/http/util/regex-rewriter.spec.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -265,7 +265,7 @@ const originalWithModifyObstructiveThirdPartyCode = `\
dynamicIntegrityScript.src = 'integrity.js'
dynamicIntegrityScript.setAttribute('crossorigin', "anonymous")
dynamicIntegrityScript.setAttribute('data-script-type', 'dynamic')
dynamicIntegrityScript.setAttribute('integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C"
dynamicIntegrityScript.setAttribute('integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C")
document.querySelector('head').appendChild(dynamicIntegrityScript)
</script>
<link id="static-set-integrity-link" rel="stylesheet" href="integrity.css" integrity="sha256-MGkilwijzWAi/LutxKC+CWhsXXc6t1tXTMqY1zakP8c=">
Expand All @@ -279,6 +279,17 @@ const originalWithModifyObstructiveThirdPartyCode = `\
dynamicIntegrityScript.setAttribute('integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C")
document.querySelector('head').appendChild(dynamicIntegrityScript)
</script>
<script>
(function(){var d=document,po=d.createElement('script');po.type='text/javascript';po.async=true;po.src='https://www.foobar.com/foobar.js';po.crossOrigin='anonymous';po.integrity='sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C';var e=d.querySelector('script[nonce]'),n=e&&(e['nonce']||e.getAttribute('nonce'));if(n){po.setAttribute('nonce',n);}var s=d.getElementsByTagName('script')[0];s.parentNode.insertBefore(po, s);})();
var integrity = 'sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo.integrity = 'foo-bar'
foo.integrity = 'sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo['integrity'] = 'sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
var integrity='sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo.integrity='foo-bar'
foo.integrity='sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo['integrity']='sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
</script>
</body>
</html>\
`
Expand Down Expand Up @@ -380,7 +391,7 @@ const expectedWithModifyObstructiveThirdPartyCode = `\
dynamicIntegrityScript.src = 'integrity.js'
dynamicIntegrityScript.setAttribute('crossorigin', "anonymous")
dynamicIntegrityScript.setAttribute('data-script-type', 'dynamic')
dynamicIntegrityScript.setAttribute('integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C"
dynamicIntegrityScript.setAttribute('cypress-stripped-integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C")
document.querySelector('head').appendChild(dynamicIntegrityScript)
</script>
<link id="static-set-integrity-link" rel="stylesheet" href="integrity.css" cypress-stripped-integrity="sha256-MGkilwijzWAi/LutxKC+CWhsXXc6t1tXTMqY1zakP8c=">
Expand All @@ -391,9 +402,20 @@ const expectedWithModifyObstructiveThirdPartyCode = `\
dynamicIntegrityScript.rel = "stylesheet"
dynamicIntegrityScript.href = 'integrity.css'
dynamicIntegrityScript.setAttribute('crossorigin', "anonymous")
dynamicIntegrityScript.setAttribute('integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C")
dynamicIntegrityScript.setAttribute('cypress-stripped-integrity', "sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C")
document.querySelector('head').appendChild(dynamicIntegrityScript)
</script>
<script>
(function(){var d=document,po=d.createElement('script');po.type='text/javascript';po.async=true;po.src='https://www.foobar.com/foobar.js';po.crossOrigin='anonymous';po['cypress-stripped-integrity']='sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C';var e=d.querySelector('script[nonce]'),n=e&&(e['nonce']||e.getAttribute('nonce'));if(n){po.setAttribute('nonce',n);}var s=d.getElementsByTagName('script')[0];s.parentNode.insertBefore(po, s);})();
var integrity = 'sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo.integrity = 'foo-bar'
foo['cypress-stripped-integrity'] = 'sha384-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo['cypress-stripped-integrity'] = 'sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
var integrity='sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo.integrity='foo-bar'
foo['cypress-stripped-integrity']='sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
foo['cypress-stripped-integrity']='sha256-XiV6bRRw9OEpsWSumtD1J7rElgTrNQro4MY/O4IYjhH+YGCf1dHaNGZ3A2kzYi/C'
</script>
</body>
</html>\
`
Expand Down