* feat(ssh): support Kerberos/GSSAPI hosts via the system OpenSSH transport
ssh2 has no gssapi-with-mic support, and adding it would mean forking its
protocol layer plus packaging the kerberos native module for three
platforms. Instead, route GSSAPI hosts through the existing system-OpenSSH
transport, which delegates Kerberos (tickets, SSPI on Windows) to the
platform ssh binary.
Two tiers, because RHEL-family distros enable GSSAPIAuthentication
globally in /etc/ssh/ssh_config and ssh -G therefore reports it for every
host:
- Targets whose ~/.ssh/config Host block explicitly sets
GSSAPIAuthentication yes (imported as target.gssapiAuthentication) try
system ssh first, falling through to ssh2 so key auth and credential
prompts still work when no ticket is available.
- When ssh2 exhausts key/agent auth and the ssh -G-resolved config
enables GSSAPI, retry over system ssh before prompting for credentials,
so Kerberos-only hosts on distro-default configs connect without a
password prompt. Hosts where keys work never leave the ssh2 path.
Manual targets flagged for GSSAPI pass -o GSSAPIAuthentication=yes
explicitly since they bypass ssh_config. Both tiers work headless (no
credential callbacks required).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
* fix(ssh): harden GSSAPI transport selection (review fixes for PR #7507)
Review fixes on top of the Kerberos/GSSAPI feature branch (s546126/kerberos-ssh):
- HIGH: reset useSystemSshTransport on the ssh2 fall-through. doSystemSshProbe
sets the flag before spawnSystemSshCommand, which throws synchronously when no
system ssh binary is on PATH (outside the probe try/catch). The proactive
fall-through previously reset only 2 of 3 transport fields, so exec/sftp kept
routing through the failed transport - breaking GSSAPI on Windows-with-Git-ssh
and headless Linux.
- MEDIUM: throw a cancellation error (not the stale ssh2 authError) when a
disconnect supersedes the reactive probe mid-flight, and guard connect()'s
catch on disposed, so a deliberate disconnect is not overwritten with
auth-failed.
- MEDIUM: skip the encrypted-key passphrase prompt when the GSSAPI fallback
applies, so a Kerberos ticket is tried before prompting; the general prompt
still fires if the probe fails.
Adds 3 mutation-verified regression tests and hardens two existing tests to
assert the probe actually ran. Not connected to any PR remote.
Co-authored-by: Orca <help@stably.ai>
* fix(ssh): isolate GSSAPI system transport
Co-authored-by: Orca <help@stably.ai>
---------
Co-authored-by: s546126 <268420947+s546126@users.noreply.github.com>
Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
Co-authored-by: Neil <4138956+nwparker@users.noreply.github.com>
Co-authored-by: Jinwoo-H <jinwoo0825@gmail.com>
Co-authored-by: Orca <help@stably.ai>
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