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Require the plain ECDSA key blob type to match the host key method selected during KEXINIT. Add a regression test that loads the existing P-256 test host key from disk.
vszakats
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Oct 29, 2026
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The three plain ECDSA host-key methods use the same key importer. The importer accepted any supported ECDSA curve identifier from the key blob without checking that it matched the host-key method selected during KEXINIT. A session that selected
ecdsa-sha2-nistp521could therefore accept a P-256 key blob.Require the key-blob algorithm identifier to match
session->hostkey->namebefore importing the key.The regression test loads the existing repository test key
tests/openssh_server/ssh_host_ecdsa_key.pubfrom disk. It fails on current unpatchedmasterand passes with this change.Tested with OpenSSL 3.6.3 under ASan/UBSan: 61/61 CTest cases passed.