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http_client: prevent domain fronting (Host mismatch) when using proxy #36805

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http_client: prevent domain fronting (Host mismatch) when using proxy #36805

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2375832
http_client: prevent domain fronting (Host mismatch) when using proxy
LouisSung Jan 5, 2021
e4ef0cd
fix: replace builtin modules with per_context/primordials
LouisSung Jan 6, 2021
b216679
test: modify test case to match Host in header with destination
LouisSung Jan 6, 2021
3919518
feat: adjust implementation to reuse IPv6 Host address check
LouisSung Jan 9, 2021
e99bd70
feat: apply suggestion to replace StringPrototypeMatch with RegExpPro…
LouisSung Jan 17, 2021
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10 changes: 10 additions & 0 deletions lib/_http_client.js
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Original file line number Diff line number Diff line change
Expand Up @@ -36,6 +36,8 @@ const {
StringPrototypeCharCodeAt,
StringPrototypeIncludes,
StringPrototypeIndexOf,
StringPrototypeReplace,
StringPrototypeStartsWith,
StringPrototypeToUpperCase,
Symbol,
TypedArrayPrototypeSlice,
Expand Down Expand Up @@ -284,6 +286,14 @@ function ClientRequest(input, options, cb) {
if (port && +port !== defaultPort) {
hostHeader += ':' + port;
}

// Prevent potential domain fronting misjudgement when using proxy
// Overwrite the "default Host requst header" with the host of path
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if (!StringPrototypeStartsWith(this.path, '/')) {
hostHeader = new URL(
`http://${StringPrototypeReplace(this.path, /^.*:\/\//, '')}`).host;
}

this.setHeader('Host', hostHeader);
}

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3 changes: 2 additions & 1 deletion test/parallel/test-tls-over-http-tunnel.js
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Original file line number Diff line number Diff line change
Expand Up @@ -61,7 +61,8 @@ const proxy = net.createServer((clientSocket) => {
`CONNECT localhost:${server.address().port} ` +
'HTTP/1.1\r\n' +
'Proxy-Connections: keep-alive\r\n' +
`Host: localhost:${proxy.address().port}\r\n` +
// Match header Host with destination Host
`Host: localhost:${server.address().port}\r\n` +
'Connection: close\r\n\r\n');

console.log('PROXY: got CONNECT request');
Expand Down