Ben Humphreys created SSHD-1216:
-----------------------------------
Summary: Implement RFC 8332 server-sig-algs on the server
Key: SSHD-1216
URL: https://issues.apache.org/jira/browse/SSHD-1216
Project: MINA SSHD
Issue Type: Improvement
Reporter: Ben Humphreys
In the recently released OpenSSH 8.8 "ssh-rsa" the public key signature
algorithm that depends on SHA-1 has been disabled by default:
{quote}
This release disables RSA signatures using the SHA-1 hash algorithm 2by
default. This change has been made as the SHA-1 hash algorithm is
3cryptographically broken, and it is possible to create chosen-prefix 4hash
collisions for <USD$50K [1]
{quote}
As a result OpenSSH 8.8 clients are unable to authenticate with Mina SSHD
servers with RSA based keys. OpenSSH since 7.2 does however support RFC 8332
RSA/SHA-256/512 signatures.
It appears Mina SSHD partly implements support for RFC 8332, indeed the client
appears to support it (see SSHD-1141). However the server appears to lack full
support because it doesn't full implement the"server-sig-algs" extension. The
basic framework for supporting this seems to be present, specifically
`AbstractKexFactoryManager.setKexExtensionHandler()` could perhaps permit such
aserver-sig-algs extension.
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