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Andrew Lytvynov 29e98e18f8 ssh/tailssh: use a local error instead of gossh.ErrDenied (#10743 )

ErrDenied was added in [our fork of
x/crypto/ssh](https://github.com/golang/crypto/commit/acc6f8fe8d618cba34d44e89fdde304f98c576df)
to short-circuit auth attempts once one fails.

In the case of our callbacks, this error is returned when SSH policy
check determines that a connection should not be allowed. Both
`NoClientAuthCallback` and `PublicKeyHandler` check the policy and will
fail anyway. The `fakePasswordHandler` returns true only if
`NoClientAuthCallback` succeeds the policy check, so it checks it
indirectly too.

The difference here is that a client might attempt all 2-3 auth methods
instead of just `none` but will fail to authenticate regardless.

Updates #8593

Signed-off-by: Andrew Lytvynov <awly@tailscale.com>

2024-01-05 08:02:42 -08:00

incubator_linux.go

all: update copyright and license headers

2023-01-27 15:36:29 -08:00

incubator.go

ssh/tailssh: add envknobs to force override forwarding, sftp, pty

2023-11-09 13:37:54 -08:00

privs_test.go

all: use Go 1.21 slices, maps instead of x/exp/{slices,maps}

2023-08-17 08:42:35 -07:00

tailssh_test.go

all: replace deprecated ioutil references