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tailscale/ssh/tailssh
James Tucker 39a61888b8 ssh/tailssh: send audit messages on SSH login (Linux)
Send LOGIN audit messages to the kernel audit subsystem on Linux
when users successfully authenticate to Tailscale SSH. This provides
administrators with audit trail integration via auditd or journald,
recording details about both the Tailscale user (whois) and the
mapped local user account.

The implementation uses raw netlink sockets to send AUDIT_USER_LOGIN
messages to the kernel audit subsystem. It requires CAP_AUDIT_WRITE
capability, which is checked at runtime. If the capability is not
present, audit logging is silently skipped.

Audit messages are sent to the kernel (pid 0) and consumed by either
auditd (written to /var/log/audit/audit.log) or journald (available
via journalctl _TRANSPORT=audit), depending on system configuration.

Note: This may result in duplicate messages on a system where
auditd/journald audit logs are enabled and the system has and supports
`login -h`. Sadly Linux login code paths are still an inconsistent wild
west so we accept the potential duplication rather than trying to avoid
it.

Fixes #18332

Signed-off-by: James Tucker <james@tailscale.com>
6 days ago
..
testcontainers ssh/tailssh: accept passwords and public keys 11 months ago
accept_env.go ssh: Add logic to set accepted environment variables in SSH session (#13559) 1 year ago
accept_env_test.go ssh: Add logic to set accepted environment variables in SSH session (#13559) 1 year ago
auditd_linux.go ssh/tailssh: send audit messages on SSH login (Linux) 6 days ago
auditd_linux_test.go ssh/tailssh: send audit messages on SSH login (Linux) 6 days ago
incubator.go ssh/tailssh: fix incubator tests on macOS arm64 2 months ago
incubator_linux.go ssh/tailssh: exclude Android from Linux build tags 8 months ago
incubator_plan9.go ssh/tailssh: add Plan 9 support for Tailscale SSH 9 months ago
privs_test.go ssh/tailssh: only chdir incubator process to user's homedir when necessary and possible 1 year ago
tailssh.go ssh/tailssh: send audit messages on SSH login (Linux) 6 days ago
tailssh_integration_test.go ssh/tailssh: accept passwords and public keys 11 months ago
tailssh_test.go ssh/tailssh: mark TestSSHRecordingCancelsSessionsOnUploadFailure as flaky 4 months ago
user.go ssh/tailssh: exclude Android from Linux build tags 8 months ago