107 lines
2.6 KiB
Go
107 lines
2.6 KiB
Go
package shim
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import (
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"encoding/gob"
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"errors"
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"net"
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"syscall"
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"git.ophivana.moe/security/fortify/acl"
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"git.ophivana.moe/security/fortify/internal/fmsg"
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)
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// called in the parent process
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func ServeConfig(socket string, abort chan error, killShim func(), uid int, payload *Payload, wl *Wayland) error {
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if payload.WL {
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if f, err := net.DialUnix("unix", nil, &net.UnixAddr{Name: wl.Path, Net: "unix"}); err != nil {
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return err
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} else {
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fmsg.VPrintf("connected to wayland at %q", wl.Path)
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wl.UnixConn = f
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}
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}
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// setup success state accessed by abort
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var success bool
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if c, err := net.ListenUnix("unix", &net.UnixAddr{Name: socket, Net: "unix"}); err != nil {
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return err
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} else {
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c.SetUnlinkOnClose(true)
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go func() {
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err1 := <-abort
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if !success {
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fmsg.VPrintln("aborting shim setup, reason:", err1)
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if err1 = c.Close(); err1 != nil {
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fmsg.Println("cannot abort shim setup:", err1)
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}
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}
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close(abort)
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}()
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fmsg.VPrintf("configuring shim on socket %q", socket)
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if err = acl.UpdatePerm(socket, uid, acl.Read, acl.Write, acl.Execute); err != nil {
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fmsg.Println("cannot change permissions of shim setup socket:", err)
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}
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go func() {
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var conn *net.UnixConn
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if conn, err = c.AcceptUnix(); err != nil {
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if errors.Is(err, net.ErrClosed) {
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fmsg.VPrintln("accept failed due to shim setup abort")
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} else {
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fmsg.Println("cannot accept connection from shim:", err)
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}
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} else {
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if err = gob.NewEncoder(conn).Encode(*payload); err != nil {
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fmsg.Println("cannot stream shim payload:", err)
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killShim()
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return
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}
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if payload.WL {
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// get raw connection
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var rc syscall.RawConn
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if rc, err = wl.SyscallConn(); err != nil {
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fmsg.Println("cannot obtain raw wayland connection:", err)
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killShim()
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return
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} else {
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go func() {
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// pass wayland socket fd
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if err = rc.Control(func(fd uintptr) {
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if _, _, err = conn.WriteMsgUnix(nil, syscall.UnixRights(int(fd)), nil); err != nil {
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fmsg.Println("cannot pass wayland connection to shim:", err)
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killShim()
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return
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}
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_ = conn.Close()
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// block until shim exits
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<-wl.done
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fmsg.VPrintln("releasing wayland connection")
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}); err != nil {
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fmsg.Println("cannot obtain wayland connection fd:", err)
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}
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}()
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}
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} else {
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_ = conn.Close()
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}
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}
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success = true
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if err = c.Close(); err != nil {
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if errors.Is(err, net.ErrClosed) {
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fmsg.VPrintln("close failed due to shim setup abort")
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} else {
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fmsg.Println("cannot close shim socket:", err)
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}
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}
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}()
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return nil
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}
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}
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