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ssh/tailssh: unify some of the incubator_* GOOS files into incubator.go

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In prep for fix for #6888

Change-Id: I79f780c6467a9b7ac03017b27d412d6b0d2f7e6b
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>
This commit is contained in:
Brad Fitzpatrick 2023-01-06 12:13:38 -08:00 committed by Brad Fitzpatrick
parent ebbf5c57b3
commit 8047dfa2dc
4 changed files with 36 additions and 58 deletions
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36
ssh/tailssh/incubator.go
View File

@ -693,3 +693,39 @@ func acceptEnvPair(kv string) bool {
}
return k == "TERM" || k == "LANG" || strings.HasPrefix(k, "LC_")
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return err == nil
}
func (ia *incubatorArgs) loginArgs() []string {
switch runtime.GOOS {
case "linux":
if distro.Get() == distro.Arch && !fileExists("/etc/pam.d/remote") {
// See https://github.com/tailscale/tailscale/issues/4924
//
// Arch uses a different login binary that makes the -h flag set the PAM
// service to "remote". So if they don't have that configured, don't
// pass -h.
return []string{ia.loginCmdPath, "-f", ia.localUser, "-p"}
}
return []string{ia.loginCmdPath, "-f", ia.localUser, "-h", ia.remoteIP, "-p"}
case "darwin", "freebsd":
return []string{ia.loginCmdPath, "-fp", "-h", ia.remoteIP, ia.localUser}
}
panic("unimplemented")
}
func setGroups(groupIDs []int) error {
if runtime.GOOS == "darwin" && len(groupIDs) > 16 {
// darwin returns "invalid argument" if more than 16 groups are passed to syscall.Setgroups
// some info can be found here:
// https://opensource.apple.com/source/samba/samba-187.8/patches/support-darwin-initgroups-syscall.auto.html
// this fix isn't great, as anyone reading this has probably just wasted hours figuring out why
// some permissions thing isn't working, due to some arbitrary group ordering, but it at least allows
// this to work for more things than it previously did.
groupIDs = groupIDs[:16]
}
return syscall.Setgroups(groupIDs)
}

21
ssh/tailssh/incubator_darwin.go
View File

@ -1,21 +0,0 @@
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tailssh
import "syscall"
func (ia *incubatorArgs) loginArgs() []string {
return []string{ia.loginCmdPath, "-fp", "-h", ia.remoteIP, ia.localUser}
}
func setGroups(groupIDs []int) error {
// darwin returns "invalid argument" if more than 16 groups are passed to syscall.Setgroups
// some info can be found here:
// https://opensource.apple.com/source/samba/samba-187.8/patches/support-darwin-initgroups-syscall.auto.html
// this fix isn't great, as anyone reading this has probably just wasted hours figuring out why
// some permissions thing isn't working, due to some arbitrary group ordering, but it at least allows
// this to work for more things than it previously did.
return syscall.Setgroups(groupIDs[:16])
}

15
ssh/tailssh/incubator_freebsd.go
View File

@ -1,15 +0,0 @@
// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package tailssh
import "syscall"
func (ia *incubatorArgs) loginArgs() []string {
return []string{ia.loginCmdPath, "-fp", "-h", ia.remoteIP, ia.localUser}
}
func setGroups(groupIDs []int) error {
return syscall.Setgroups(groupIDs)
}

22
ssh/tailssh/incubator_linux.go
View File

@ -16,7 +16,6 @@ import (
"github.com/godbus/dbus/v5"
"tailscale.com/types/logger"
"tailscale.com/version/distro"
)
func init() {
@ -173,24 +172,3 @@ func maybeStartLoginSessionLinux(logf logger.Logf, ia incubatorArgs) (func() err
}
return nil, nil
}
func fileExists(path string) bool {
_, err := os.Stat(path)
return err == nil
}
func (ia *incubatorArgs) loginArgs() []string {
if distro.Get() == distro.Arch && !fileExists("/etc/pam.d/remote") {
// See https://github.com/tailscale/tailscale/issues/4924
//
// Arch uses a different login binary that makes the -h flag set the PAM
// service to "remote". So if they don't have that configured, don't
// pass -h.
return []string{ia.loginCmdPath, "-f", ia.localUser, "-p"}
}
return []string{ia.loginCmdPath, "-f", ia.localUser, "-h", ia.remoteIP, "-p"}
}
func setGroups(groupIDs []int) error {
return syscall.Setgroups(groupIDs)
}