app: merge shim into app package

Signed-off-by: Ophestra <cat@gensokyo.uk>

1 files changed, 0 insertions, 115 deletions

diff --git a/internal/app/shim/main.go b/internal/app/shim/main.go
deleted file mode 100644
index 17f346a2..00000000
--- a/internal/app/shim/main.go
+++ /dev/null
@@ -1,115 +0,0 @@
-package shim
-
-import (
-	"context"
-	"errors"
-	"log"
-	"os"
-	"os/exec"
-	"os/signal"
-	"syscall"
-	"time"
-
-	"git.gensokyo.uk/security/fortify/internal"
-	"git.gensokyo.uk/security/fortify/internal/fmsg"
-	"git.gensokyo.uk/security/fortify/sandbox"
-)
-
-const Env = "FORTIFY_SHIM"
-
-type Params struct {
-	// finalised container params
-	Container *sandbox.Params
-	// path to outer home directory
-	Home string
-
-	// verbosity pass through
-	Verbose bool
-}
-
-// everything beyond this point runs as unconstrained target user
-// proceed with caution!
-
-func Main() {
-	// sharing stdout with fortify
-	// USE WITH CAUTION
-	fmsg.Prepare("shim")
-
-	if err := sandbox.SetDumpable(sandbox.SUID_DUMP_DISABLE); err != nil {
-		log.Fatalf("cannot set SUID_DUMP_DISABLE: %s", err)
-	}
-
-	var (
-		params     Params
-		closeSetup func() error
-	)
-	if f, err := sandbox.Receive(Env, &params, nil); err != nil {
-		if errors.Is(err, sandbox.ErrInvalid) {
-			log.Fatal("invalid config descriptor")
-		}
-		if errors.Is(err, sandbox.ErrNotSet) {
-			log.Fatal("FORTIFY_SHIM not set")
-		}
-
-		log.Fatalf("cannot receive shim setup params: %v", err)
-	} else {
-		internal.InstallFmsg(params.Verbose)
-		closeSetup = f
-	}
-
-	if params.Container == nil || params.Container.Ops == nil {
-		log.Fatal("invalid container params")
-	}
-
-	// close setup socket
-	if err := closeSetup(); err != nil {
-		log.Printf("cannot close setup pipe: %v", err)
-		// not fatal
-	}
-
-	// ensure home directory as target user
-	if s, err := os.Stat(params.Home); err != nil {
-		if os.IsNotExist(err) {
-			if err = os.Mkdir(params.Home, 0700); err != nil {
-				log.Fatalf("cannot create home directory: %v", err)
-			}
-		} else {
-			log.Fatalf("cannot access home directory: %v", err)
-		}
-
-		// home directory is created, proceed
-	} else if !s.IsDir() {
-		log.Fatalf("path %q is not a directory", params.Home)
-	}
-
-	var name string
-	if len(params.Container.Args) > 0 {
-		name = params.Container.Args[0]
-	}
-	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM)
-	defer stop() // unreachable
-	container := sandbox.New(ctx, name)
-	container.Params = *params.Container
-	container.Stdin, container.Stdout, container.Stderr = os.Stdin, os.Stdout, os.Stderr
-	container.Cancel = func(cmd *exec.Cmd) error { return cmd.Process.Signal(os.Interrupt) }
-	container.WaitDelay = 2 * time.Second
-
-	if err := container.Start(); err != nil {
-		fmsg.PrintBaseError(err, "cannot start container:")
-		os.Exit(1)
-	}
-	if err := container.Serve(); err != nil {
-		fmsg.PrintBaseError(err, "cannot configure container:")
-	}
-	if err := container.Wait(); err != nil {
-		var exitError *exec.ExitError
-		if !errors.As(err, &exitError) {
-			if errors.Is(err, context.Canceled) {
-				os.Exit(2)
-			}
-			log.Printf("wait: %v", err)
-			os.Exit(127)
-		}
-		os.Exit(exitError.ExitCode())
-	}
-}