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Reject cleartext messages with extraneous data preceeding hash header

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Parsing of such messages will fail, as the data in the header is not verified,
and allowing it opens up the possibility of signature spoofing.
This commit is contained in:
larabr 2023-08-28 16:43:42 +02:00
parent 4df86e53a7
commit 11b59994cf
2 changed files with 27 additions and 1 deletions
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2
src/cleartext.js
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@ -174,7 +174,7 @@ function verifyHeaders(headers, packetlist) {
let oneHeader = null;
let hashAlgos = [];
headers.forEach(function(header) {
oneHeader = header.match(/Hash: (.+)/); // get header value
oneHeader = header.match(/^Hash: (.+)$/); // get header value
if (oneHeader) {
oneHeader = oneHeader[1].replace(/\s/g, ''); // remove whitespace
oneHeader = oneHeader.split(',');

26
test/general/signature.js
View File

@ -999,6 +999,32 @@ eSvSZutLuKKbidSYMLhWROPlwKc2GU2ws6PrLZAyCAel/lU=
expect(await sigInfo.verified).to.be.true;
});
it('Reject cleartext message with arbitrary text added around hash headers (spoofed cleartext message)', async function() {
await expect(openpgp.readCleartextMessage({ cleartextMessage: `-----BEGIN PGP SIGNED MESSAGE-----
This is not signed but you might think it is Hash: SHA512
This is signed
-----BEGIN PGP SIGNATURE-----
wnUEARYKACcFgmTsqxgJkEhlqJkkhIfRFiEEUA/OS4xZ3EwNC5l8SGWomSSE
h9EAALyPAQDDR0IYwq/5XMVSYPWojBamM4NhcP5arA656ALIq9cJYAEAlw0H
Fk7EflUZzngwY4lBzYAfnNBjEjc30xD/ddo+rwE=
=O7mt
-----END PGP SIGNATURE-----` })).to.be.rejectedWith(/Only "Hash" header allowed/);
await expect(openpgp.readCleartextMessage({ cleartextMessage: `-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512\vThis is not signed but you might think it is
This is signed
-----BEGIN PGP SIGNATURE-----
wnUEARYKACcFgmTsqxgJkEhlqJkkhIfRFiEEUA/OS4xZ3EwNC5l8SGWomSSE
h9EAALyPAQDDR0IYwq/5XMVSYPWojBamM4NhcP5arA656ALIq9cJYAEAlw0H
Fk7EflUZzngwY4lBzYAfnNBjEjc30xD/ddo+rwE=
=O7mt
-----END PGP SIGNATURE-----` })).to.be.rejectedWith(/Unknown hash algorithm in armor header/);
});
it('Supports non-human-readable notations', async function() {
const { packets: [signature] } = await openpgp.readSignature({ armoredSignature: signature_with_non_human_readable_notations });
// There are no human-readable notations so `notations` property does not