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// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
//go:build linux
package syscall_test
import (
"bytes"
"net"
"os"
"syscall"
"testing"
)
// TestSCMCredentials tests the sending and receiving of credentials
// (PID, UID, GID) in an ancillary message between two UNIX
// sockets. The SO_PASSCRED socket option is enabled on the sending
// socket for this to work.
func TestSCMCredentials(t *testing.T) {
socketTypeTests := []struct {
socketType int
dataLen int
}{
{
syscall.SOCK_STREAM,
1,
}, {
syscall.SOCK_DGRAM,
0,
},
}
for _, tt := range socketTypeTests {
fds, err := syscall.Socketpair(syscall.AF_LOCAL, tt.socketType, 0)
if err != nil {
t.Fatalf("Socketpair: %v", err)
}
err = syscall.SetsockoptInt(fds[0], syscall.SOL_SOCKET, syscall.SO_PASSCRED, 1)
if err != nil {
syscall.Close(fds[0])
syscall.Close(fds[1])
t.Fatalf("SetsockoptInt: %v", err)
}
srvFile := os.NewFile(uintptr(fds[0]), "server")
cliFile := os.NewFile(uintptr(fds[1]), "client")
defer srvFile.Close()
defer cliFile.Close()
srv, err := net.FileConn(srvFile)
if err != nil {
t.Errorf("FileConn: %v", err)
return
}
defer srv.Close()
cli, err := net.FileConn(cliFile)
if err != nil {
t.Errorf("FileConn: %v", err)
return
}
defer cli.Close()
var ucred syscall.Ucred
if os.Getuid() != 0 {
ucred.Pid = int32(os.Getpid())
ucred.Uid = 0
ucred.Gid = 0
oob := syscall.UnixCredentials(&ucred)
_, _, err := cli.(*net.UnixConn).WriteMsgUnix(nil, oob, nil)
if op, ok := err.(*net.OpError); ok {
err = op.Err
}
if sys, ok := err.(*os.SyscallError); ok {
err = sys.Err
}
if err != syscall.EPERM {
t.Fatalf("WriteMsgUnix failed with %v, want EPERM", err)
}
}
ucred.Pid = int32(os.Getpid())
ucred.Uid = uint32(os.Getuid())
ucred.Gid = uint32(os.Getgid())
oob := syscall.UnixCredentials(&ucred)
// On SOCK_STREAM, this is internally going to send a dummy byte
n, oobn, err := cli.(*net.UnixConn).WriteMsgUnix(nil, oob, nil)
if err != nil {
t.Fatalf("WriteMsgUnix: %v", err)
}
if n != 0 {
t.Fatalf("WriteMsgUnix n = %d, want 0", n)
}
if oobn != len(oob) {
t.Fatalf("WriteMsgUnix oobn = %d, want %d", oobn, len(oob))
}
oob2 := make([]byte, 10*len(oob))
n, oobn2, flags, _, err := srv.(*net.UnixConn).ReadMsgUnix(nil, oob2)
if err != nil {
t.Fatalf("ReadMsgUnix: %v", err)
}
if flags != syscall.MSG_CMSG_CLOEXEC {
t.Fatalf("ReadMsgUnix flags = %#x, want %#x (MSG_CMSG_CLOEXEC)", flags, syscall.MSG_CMSG_CLOEXEC)
}
if n != tt.dataLen {
t.Fatalf("ReadMsgUnix n = %d, want %d", n, tt.dataLen)
}
if oobn2 != oobn {
// without SO_PASSCRED set on the socket, ReadMsgUnix will
// return zero oob bytes
t.Fatalf("ReadMsgUnix oobn = %d, want %d", oobn2, oobn)
}
oob2 = oob2[:oobn2]
if !bytes.Equal(oob, oob2) {
t.Fatal("ReadMsgUnix oob bytes don't match")
}
scm, err := syscall.ParseSocketControlMessage(oob2)
if err != nil {
t.Fatalf("ParseSocketControlMessage: %v", err)
}
newUcred, err := syscall.ParseUnixCredentials(&scm[0])
if err != nil {
t.Fatalf("ParseUnixCredentials: %v", err)
}
if *newUcred != ucred {
t.Fatalf("ParseUnixCredentials = %+v, want %+v", newUcred, ucred)
}
}
}
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