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