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ssh/tailssh: fall back to using su when no TTY available on Linux

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This allows pam authentication to run for ssh sessions, triggering
automation like pam_mkhomedir.

Updates #11854

Signed-off-by: Percy Wegmann <percy@tailscale.com>
This commit is contained in:
Percy Wegmann
2024-05-29 12:51:50 -05:00
committed by Percy Wegmann
parent f1d10c12ac
commit 08a9551a73
9 changed files with 632 additions and 260 deletions
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4
ssh/tailssh/privs_test.go
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@@ -23,7 +23,7 @@ import (
"tailscale.com/types/logger"
)
func TestDropPrivileges(t *testing.T) {
func TestDoDropPrivileges(t *testing.T) {
type SubprocInput struct {
UID int
GID int
@@ -49,7 +49,7 @@ func TestDropPrivileges(t *testing.T) {
f := os.NewFile(3, "out.json")
// We're in our subprocess; actually drop privileges now.
dropPrivileges(t.Logf, input.UID, input.GID, input.AdditionalGroups)
doDropPrivileges(t.Logf, input.UID, input.GID, input.AdditionalGroups)
additional, _ := syscall.Getgroups()