I reset /etc/ssh/sshd_config to the attached version, and attempted ssh -v localhost
while logged in as username=kennykb uid=117 The output of 'ssh -v' is attached as 'sshclient.txt'. The only lines that appeared in syslog after I restarted the daemon were in the attached 'syslog.txt'. The corresponding time period in auth.log is attached as 'authlog.txt'. The contents of /etc/ssh/ssh_config at the time of the failure are attached. (I'll attach the files in the next few messages.) The first is auth.log. 192.168.1.1 is my gateway machine. I see that I'm being hammered 3-4 times a minute with unauthorized requests to log in as root from some external machine. Isn't the internet a spectacularly hostile place? If this is not enough, what else do you need? Another developer mentioned rebuilding from source with a particular debugging option turned on - if you need this, can you give me a precise description of the location and version of the package you want rebuilt and the exact change you want? ** Attachment added: "auth.log from the ssh daemon restart through the login failure" https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1690485/+attachment/4877132/+files/authlog.txt -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to openssh in Ubuntu. https://bugs.launchpad.net/bugs/1690485 Title: openssh-server SIGSYS with 'UsePrivilegeSeparation sandbox' Status in openssh package in Ubuntu: New Bug description: The 'sshd' process gets 'authentication failure' and refuses to allow any login. dmesg indicates that the problem is SIGSYS on a call to 'socket' (syscall #41, signal #31). On a hunch, I decided to test whether the problem is related to 'seccomp' and changed /etc/ssh/sshd_config from the default # UsePrivilegeSeparation sandbox to the former standard value UsePrivilegeSeparation yes and logins started to work again. Obviously, I'd like to have the additional protection that sandboxing would give me. ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: openssh-server 1:7.4p1-10 ProcVersionSignature: Ubuntu 4.10.0-20.22-generic 4.10.8 Uname: Linux 4.10.0-20-generic x86_64 ApportVersion: 2.20.4-0ubuntu4 Architecture: amd64 CurrentDesktop: XFCE Date: Fri May 12 21:06:20 2017 InstallationDate: Installed on 2017-04-08 (35 days ago) InstallationMedia: SourcePackage: openssh UpgradeStatus: Upgraded to zesty on 2017-04-24 (19 days ago) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/1690485/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
