Indeed. PuTTY 0.62 and earlier had a habit of generating slightly short
keys sometimes.
This is unlikely to change in OpenSSH - the minimum key size is only
likely to increase over time. I'd strongly suggest just generating a
2048-bit key, since SSH keys are usually pretty easy to roll over.
** Changed in: openssh (Ubuntu)
Status: Confirmed => Invalid
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https://bugs.launchpad.net/bugs/1756031
Title:
openssh-server doesn't accept aes256-cbc key
Status in openssh package in Ubuntu:
Invalid
Bug description:
I am using putty connection with RSA key cached in pageant and want to
login without password.
Private key on windows:
PuTTY-User-Key-File-2: ssh-rsa
Encryption: aes256-cbc
...
On ubuntu there is public key in .ssh/authorized_keys
ssh-rsa AAAAB3Nz...JBjQ== palo@winpgnotas
This key works well in ubuntu versions 14.04...17.10
When I tried 18.04 beta, I am getting sshd error:
mar 15 10:26:21 ubox sshd[5205]: error: userauth_pubkey: could not parse key:
Invalid key length [preauth]
and I have to provide password.
I've found that aes256-cbc is not in the list of allowed ciphers by default,
so I added
Ciphers +aes256-cbc
to /etc/ssh/sshd_config
(and verified with nmap --script ssh2-enum-algos -sV -p 22 127.0.0.1)
but the sshd error remains.
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: openssh-server 1:7.6p1-4
ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
Uname: Linux 4.15.0-10-generic x86_64
ApportVersion: 2.20.8-0ubuntu10
Architecture: amd64
Date: Thu Mar 15 10:03:14 2018
InstallationDate: Installed on 2018-03-12 (2 days ago)
InstallationMedia: Xubuntu 18.04 LTS "Bionic Beaver" - Alpha amd64
(20180306.1)
SourcePackage: openssh
UpgradeStatus: No upgrade log present (probably fresh install)
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