Quick test with https://launchpad.net/~ahasenack/+archive/ubuntu/openssh- gsskeyex-2053146/+packages on jammy (but there are builds for other releases too), seems to work:
Mar 13 20:52:58 j-keyex sshd[1638]: Authorized to ubuntu, krb5 principal andreas@LOWTECH (krb5_kuserok) Mar 13 20:52:58 j-keyex sshd[1638]: Accepted gssapi-keyex for ubuntu from 10.0.102.1 port 48450 ssh2: andreas@LOWTECH -- 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/2053146 Title: openssh 8.9p1 for Jammy auth2-gss patch for gssapi-keyex method is slightly wrong Status in openssh package in Ubuntu: In Progress Status in openssh source package in Jammy: In Progress Status in openssh source package in Mantic: In Progress Status in openssh source package in Noble: In Progress Bug description: The Authmethod struct now have 4 entries but the initialization of the method_gsskeyex in the debian/patches/gssapi.patch only have 3 entries. The struct was changed in upstream commit dbb339f015c33d63484261d140c84ad875a9e548 as === @@ -104,7 +104,8 @@ struct Authctxt { struct Authmethod { char *name; - int (*userauth)(struct ssh *); + char *synonym; + int (*userauth)(struct ssh *, const char *); int *enabled; }; === The incorrect code does === +Authmethod method_gsskeyex = { + "gssapi-keyex", + userauth_gsskeyex, + &options.gss_authentication +}; === but should have a NULL between the "gssapi-keyex" string and userauth_gsskeyex This is now (change from Focal) causing gssapi-keyex to be disabled. === lsb_release -rd Description: Ubuntu 22.04.3 LTS Release: 22.04 === apt-cache policy openssh-server openssh-server: Installed: 1:8.9p1-3ubuntu0.6 Candidate: 1:8.9p1-3ubuntu0.6 Version table: *** 1:8.9p1-3ubuntu0.6 500 500 http://faiserver.hpc2n.umu.se/mirrors/ubuntu/ubuntu jammy-updates/main amd64 Packages 500 http://faiserver.hpc2n.umu.se/mirrors/ubuntu/ubuntu jammy-security/main amd64 Packages 100 /var/lib/dpkg/status 1:8.9p1-3 500 500 http://faiserver.hpc2n.umu.se/mirrors/ubuntu/ubuntu jammy/main amd64 Packages === To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/openssh/+bug/2053146/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
