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Added warnings to all key exchanges that do not provide protection against quantum attacks.

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This commit is contained in:
Joe Testa
2024-11-25 15:56:51 -05:00
parent a01baadfa8
commit 28a1e23986
26 changed files with 475 additions and 162 deletions
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20
test/docker/expected_results/openssh_8.0p1_test3.txt
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@ -5,12 +5,15 @@
(gen) compression: enabled (zlib@openssh.com)
# key exchange algorithms
(kex) curve25519-sha256 -- [info] available since OpenSSH 7.4, Dropbear SSH 2018.76
 `- [info] default key exchange from OpenSSH 7.4 to 8.9
(kex) curve25519-sha256@libssh.org -- [info] available since OpenSSH 6.4, Dropbear SSH 2013.62
 `- [info] default key exchange from OpenSSH 6.5 to 7.3
(kex) diffie-hellman-group-exchange-sha256 (4096-bit) -- [info] available since OpenSSH 4.4
 `- [info] OpenSSH's GEX fallback mechanism was triggered during testing. Very old SSH clients will still be able to create connections using a 2048-bit modulus, though modern clients will use 4096. This can only be disabled by recompiling the code (see https://github.com/openssh/openssh-portable/blob/V_9_4/dh.c#L477).
(kex) curve25519-sha256 -- [warn] does not provide protection against post-quantum attacks
`- [info] available since OpenSSH 7.4, Dropbear SSH 2018.76
`- [info] default key exchange from OpenSSH 7.4 to 8.9
(kex) curve25519-sha256@libssh.org -- [warn] does not provide protection against post-quantum attacks
`- [info] available since OpenSSH 6.4, Dropbear SSH 2013.62
`- [info] default key exchange from OpenSSH 6.5 to 7.3
(kex) diffie-hellman-group-exchange-sha256 (4096-bit) -- [warn] does not provide protection against post-quantum attacks
`- [info] available since OpenSSH 4.4
`- [info] OpenSSH's GEX fallback mechanism was triggered during testing. Very old SSH clients will still be able to create connections using a 2048-bit modulus, though modern clients will use 4096. This can only be disabled by recompiling the code (see https://github.com/openssh/openssh-portable/blob/V_9_4/dh.c#L477).
# host-key algorithms
(key) ssh-ed25519 -- [info] available since OpenSSH 6.5, Dropbear SSH 2020.79
@ -34,11 +37,12 @@
(fin) ssh-ed25519: SHA256:UrnXIVH+7dlw8UqYocl48yUEcKrthGDQG2CPCgp7MxU
# algorithm recommendations (for OpenSSH 8.0)
(rec) +diffie-hellman-group16-sha512 -- kex algorithm to append 
(rec) +diffie-hellman-group18-sha512 -- kex algorithm to append 
(rec) +rsa-sha2-256 -- key algorithm to append 
(rec) +rsa-sha2-512 -- key algorithm to append 
(rec) !diffie-hellman-group-exchange-sha256 -- kex algorithm to change (increase modulus size to 3072 bits or larger) 
(rec) -chacha20-poly1305@openssh.com -- enc algorithm to remove 
(rec) -curve25519-sha256 -- kex algorithm to remove 
(rec) -curve25519-sha256@libssh.org -- kex algorithm to remove 
# additional info
(nfo) For hardening guides on common OSes, please see: <https://www.ssh-audit.com/hardening_guides.html>