254 lines
5.8 KiB
Go
254 lines
5.8 KiB
Go
// Copyright 2019 The gVisor Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package boot
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import (
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"io/ioutil"
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"os"
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"path/filepath"
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"strings"
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"syscall"
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"testing"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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"gvisor.dev/gvisor/pkg/sentry/context/contexttest"
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"gvisor.dev/gvisor/pkg/sentry/fs"
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)
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func setupTempDir() (string, error) {
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tmpDir, err := ioutil.TempDir(os.TempDir(), "exec-user-test")
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if err != nil {
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return "", err
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}
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return tmpDir, nil
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}
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func setupPasswd(contents string, perms os.FileMode) func() (string, error) {
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return func() (string, error) {
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tmpDir, err := setupTempDir()
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if err != nil {
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return "", err
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}
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if err := os.Mkdir(filepath.Join(tmpDir, "etc"), 0777); err != nil {
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return "", err
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}
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f, err := os.Create(filepath.Join(tmpDir, "etc", "passwd"))
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if err != nil {
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return "", err
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}
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defer f.Close()
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_, err = f.WriteString(contents)
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if err != nil {
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return "", err
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}
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err = f.Chmod(perms)
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if err != nil {
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return "", err
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}
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return tmpDir, nil
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}
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}
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// TestGetExecUserHome tests the getExecUserHome function.
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func TestGetExecUserHome(t *testing.T) {
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tests := map[string]struct {
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uid uint32
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createRoot func() (string, error)
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expected string
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}{
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"success": {
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uid: 1000,
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createRoot: setupPasswd("adin::1000:1111::/home/adin:/bin/sh", 0666),
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expected: "/home/adin",
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},
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"no_passwd": {
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uid: 1000,
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createRoot: setupTempDir,
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expected: "/",
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},
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"no_perms": {
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uid: 1000,
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createRoot: setupPasswd("adin::1000:1111::/home/adin:/bin/sh", 0000),
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expected: "/",
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},
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"directory": {
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uid: 1000,
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createRoot: func() (string, error) {
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tmpDir, err := setupTempDir()
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if err != nil {
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return "", err
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}
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if err := os.Mkdir(filepath.Join(tmpDir, "etc"), 0777); err != nil {
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return "", err
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}
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if err := syscall.Mkdir(filepath.Join(tmpDir, "etc", "passwd"), 0666); err != nil {
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return "", err
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}
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return tmpDir, nil
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},
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expected: "/",
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},
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// Currently we don't allow named pipes.
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"named_pipe": {
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uid: 1000,
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createRoot: func() (string, error) {
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tmpDir, err := setupTempDir()
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if err != nil {
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return "", err
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}
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if err := os.Mkdir(filepath.Join(tmpDir, "etc"), 0777); err != nil {
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return "", err
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}
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if err := syscall.Mkfifo(filepath.Join(tmpDir, "etc", "passwd"), 0666); err != nil {
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return "", err
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}
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return tmpDir, nil
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},
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expected: "/",
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},
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}
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for name, tc := range tests {
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t.Run(name, func(t *testing.T) {
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tmpDir, err := tc.createRoot()
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if err != nil {
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t.Fatalf("failed to create root dir: %v", err)
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}
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sandEnd, cleanup, err := startGofer(tmpDir)
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if err != nil {
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t.Fatalf("failed to create gofer: %v", err)
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}
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defer cleanup()
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ctx := contexttest.Context(t)
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conf := &Config{
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RootDir: "unused_root_dir",
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Network: NetworkNone,
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DisableSeccomp: true,
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}
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spec := &specs.Spec{
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Root: &specs.Root{
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Path: tmpDir,
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Readonly: true,
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},
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// Add /proc mount as tmpfs to avoid needing a kernel.
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Mounts: []specs.Mount{
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{
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Destination: "/proc",
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Type: "tmpfs",
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},
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},
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}
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var mns *fs.MountNamespace
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setMountNS := func(m *fs.MountNamespace) {
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mns = m
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ctx.(*contexttest.TestContext).RegisterValue(fs.CtxRoot, mns.Root())
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}
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mntr := newContainerMounter(spec, []int{sandEnd}, nil, &podMountHints{})
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if err := mntr.setupRootContainer(ctx, ctx, conf, setMountNS); err != nil {
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t.Fatalf("failed to create mount namespace: %v", err)
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}
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got, err := getExecUserHome(ctx, mns, tc.uid)
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if err != nil {
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t.Fatalf("failed to get user home: %v", err)
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}
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if got != tc.expected {
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t.Fatalf("expected %v, got: %v", tc.expected, got)
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}
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})
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}
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}
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// TestFindHomeInPasswd tests the findHomeInPasswd function's passwd file parsing.
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func TestFindHomeInPasswd(t *testing.T) {
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tests := map[string]struct {
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uid uint32
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passwd string
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expected string
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def string
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}{
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"empty": {
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uid: 1000,
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passwd: "",
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expected: "/",
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def: "/",
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},
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"whitespace": {
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uid: 1000,
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passwd: " ",
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expected: "/",
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def: "/",
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},
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"full": {
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uid: 1000,
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passwd: "adin::1000:1111::/home/adin:/bin/sh",
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expected: "/home/adin",
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def: "/",
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},
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// For better or worse, this is how runc works.
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"partial": {
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uid: 1000,
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passwd: "adin::1000:1111:",
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expected: "",
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def: "/",
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},
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"multiple": {
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uid: 1001,
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passwd: "adin::1000:1111::/home/adin:/bin/sh\nian::1001:1111::/home/ian:/bin/sh",
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expected: "/home/ian",
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def: "/",
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},
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"duplicate": {
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uid: 1000,
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passwd: "adin::1000:1111::/home/adin:/bin/sh\nian::1000:1111::/home/ian:/bin/sh",
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expected: "/home/adin",
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def: "/",
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},
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"empty_lines": {
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uid: 1001,
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passwd: "adin::1000:1111::/home/adin:/bin/sh\n\n\nian::1001:1111::/home/ian:/bin/sh",
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expected: "/home/ian",
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def: "/",
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},
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}
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for name, tc := range tests {
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t.Run(name, func(t *testing.T) {
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got, err := findHomeInPasswd(tc.uid, strings.NewReader(tc.passwd), tc.def)
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if err != nil {
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t.Fatalf("error parsing passwd: %v", err)
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}
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if tc.expected != got {
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t.Fatalf("expected %v, got: %v", tc.expected, got)
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}
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})
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}
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}
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