package matrix // File reading, writing, modification, truncate // // Runs everything four times, for all combinations of // "-plaintextnames" and "-openssl". // // Test Matrix: // openssl=true openssl=false // plaintextnames=false X X // plaintextnames=true X X import ( "bytes" "crypto/md5" "encoding/hex" "flag" "fmt" "io/ioutil" "os" "runtime" "sync" "syscall" "testing" "github.com/rfjakob/gocryptfs/tests/test_helpers" ) // Several tests need to be aware if plaintextnames is active or not, so make this // a global variable var plaintextnames bool // This is the entry point for the tests func TestMain(m *testing.M) { // Make "testing.Verbose()" return the correct value flag.Parse() for _, openssl := range []bool{true, false} { for _, plaintextnames = range []bool{true, false} { if testing.Verbose() { fmt.Printf("Testing openssl=%v plaintextnames=%v\n", openssl, plaintextnames) } test_helpers.ResetTmpDir(plaintextnames) opts := []string{"--zerokey"} opts = append(opts, fmt.Sprintf("-openssl=%v", openssl)) opts = append(opts, fmt.Sprintf("-plaintextnames=%v", plaintextnames)) test_helpers.MountOrExit(test_helpers.DefaultCipherDir, test_helpers.DefaultPlainDir, opts...) r := m.Run() test_helpers.Unmount(test_helpers.DefaultPlainDir) if r != 0 { os.Exit(r) } } } os.Exit(0) } // Write "n" zero bytes to filename "fn", read again, compare hash func testWriteN(t *testing.T, fn string, n int) string { file, err := os.Create(test_helpers.DefaultPlainDir + "/" + fn) if err != nil { t.Fatal(err) } d := make([]byte, n) written, err := file.Write(d) if err != nil || written != len(d) { t.Errorf("err=\"%s\", written=%d", err, written) } err = file.Close() if err != nil { t.Error(err) } test_helpers.VerifySize(t, test_helpers.DefaultPlainDir+"/"+fn, n) bin := md5.Sum(d) hashWant := hex.EncodeToString(bin[:]) hashActual := test_helpers.Md5fn(test_helpers.DefaultPlainDir + "/" + fn) if hashActual != hashWant { t.Errorf("Wrong content, hashWant=%s hashActual=%s", hashWant, hashActual) } return hashActual } func TestWrite10(t *testing.T) { testWriteN(t, "10", 10) } func TestWrite100(t *testing.T) { testWriteN(t, "100", 100) } func TestWrite1M(t *testing.T) { testWriteN(t, "1M", 1024*1024) } func TestWrite100x100(t *testing.T) { hashWant := testWriteN(t, "100x100", 100) // Read and check 100 times to catch race conditions var i int for i = 0; i < 100; i++ { hashActual := test_helpers.Md5fn(test_helpers.DefaultPlainDir + "/100") if hashActual != hashWant { fmt.Printf("Read corruption in loop #%d\n", i) t.FailNow() } else { //fmt.Print(".") } } } func TestTruncate(t *testing.T) { fn := test_helpers.DefaultPlainDir + "/truncate" file, err := os.Create(fn) if err != nil { t.FailNow() } // Grow to two blocks file.Truncate(7000) test_helpers.VerifySize(t, fn, 7000) if test_helpers.Md5fn(fn) != "95d4ec7038e3e4fdbd5f15c34c3f0b34" { t.Errorf("wrong content") } // Shrink - needs RMW file.Truncate(6999) test_helpers.VerifySize(t, fn, 6999) if test_helpers.Md5fn(fn) != "35fd15873ec6c35380064a41b9b9683b" { t.Errorf("wrong content") } // Shrink to one partial block file.Truncate(465) test_helpers.VerifySize(t, fn, 465) if test_helpers.Md5fn(fn) != "a1534d6e98a6b21386456a8f66c55260" { t.Errorf("wrong content") } // Grow to exactly one block file.Truncate(4096) test_helpers.VerifySize(t, fn, 4096) if test_helpers.Md5fn(fn) != "620f0b67a91f7f74151bc5be745b7110" { t.Errorf("wrong content") } } func TestAppend(t *testing.T) { fn := test_helpers.DefaultPlainDir + "/append" file, err := os.Create(fn) if err != nil { t.FailNow() } data := []byte("testdata123456789") // length 17 var buf bytes.Buffer var hashWant string for i := 0; i <= 500; i++ { file.Write(data) buf.Write(data) bin := md5.Sum(buf.Bytes()) hashWant = hex.EncodeToString(bin[:]) hashActual := test_helpers.Md5fn(fn) if hashWant != hashActual { t.FailNow() } } // Overwrite with the same data // Hash must stay the same file.Seek(0, 0) for i := 0; i <= 500; i++ { file.Write(data) hashActual := test_helpers.Md5fn(fn) if hashWant != hashActual { t.FailNow() } } } // Create a file with holes by writing to offset 0 (block #0) and // offset 4096 (block #1). func TestFileHoles(t *testing.T) { fn := test_helpers.DefaultPlainDir + "/fileholes" file, err := os.Create(fn) if err != nil { t.Errorf("file create failed") } foo := []byte("foo") file.Write(foo) file.WriteAt(foo, 4096) _, err = ioutil.ReadFile(fn) if err != nil { t.Error(err) } } // sContains - does the slice of strings "haystack" contain "needle"? func sContains(haystack []string, needle string) bool { for _, element := range haystack { if element == needle { return true } } return false } func TestRmwRace(t *testing.T) { runtime.GOMAXPROCS(10) fn := test_helpers.DefaultPlainDir + "/rmwrace" f1, err := os.Create(fn) if err != nil { t.Fatalf("file create failed") } f2, err := os.Create(fn) if err != nil { t.Fatalf("file create failed") } oldBlock := bytes.Repeat([]byte("o"), 4096) newBlock := bytes.Repeat([]byte("n"), 4096) shortBlock := bytes.Repeat([]byte("s"), 16) mergedBlock := make([]byte, 4096) copy(mergedBlock, newBlock) copy(mergedBlock[4080:], shortBlock) goodMd5 := make(map[string]int) for i := 0; i < 1000; i++ { // Reset to [ooooooooo] _, err = f1.WriteAt(oldBlock, 0) if err != nil { t.Fatalf("Write failed") } var wg sync.WaitGroup wg.Add(2) // Write to the end of the file, [....ssss] go func() { f1.WriteAt(shortBlock, 4080) wg.Done() }() // Overwrite to [nnnnnnn] go func() { f2.WriteAt(newBlock, 0) wg.Done() }() wg.Wait() // The file should be either: // [nnnnnnnnnn] (md5: 6c1660fdabccd448d1359f27b3db3c99) or // [nnnnnnssss] (md5: da885006a6a284530a427c73ce1e5c32) // but it must not be // [oooooossss] buf, _ := ioutil.ReadFile(fn) m := test_helpers.Md5hex(buf) goodMd5[m] = goodMd5[m] + 1 /* if m == "6c1660fdabccd448d1359f27b3db3c99" { fmt.Println(hex.Dump(buf)) t.FailNow() } */ } } // With "--plaintextnames", the name "/gocryptfs.conf" is reserved. // Otherwise there should be no restrictions. func TestFiltered(t *testing.T) { filteredFile := test_helpers.DefaultPlainDir + "/gocryptfs.conf" file, err := os.Create(filteredFile) if plaintextnames == true && err == nil { t.Errorf("should have failed but didn't") } else if plaintextnames == false && err != nil { t.Error(err) } file.Close() err = os.Remove(filteredFile) if plaintextnames == true && err == nil { t.Errorf("should have failed but didn't") } else if plaintextnames == false && err != nil { t.Error(err) } } func TestFilenameEncryption(t *testing.T) { file, err := os.Create(test_helpers.DefaultPlainDir + "/TestFilenameEncryption.txt") file.Close() if err != nil { t.Fatal(err) } _, err = os.Stat(test_helpers.DefaultCipherDir + "/TestFilenameEncryption.txt") if plaintextnames == true && err != nil { t.Errorf("plaintextnames not working: %v", err) } else if plaintextnames == false && err == nil { t.Errorf("file name encryption not working") } } // Test Mkdir and Rmdir func testMkdirRmdir(t *testing.T) { test_helpers.TestMkdirRmdir(t, test_helpers.DefaultPlainDir) } // Test Rename func testRename(t *testing.T) { test_helpers.TestRename(t, test_helpers.DefaultPlainDir) } // Overwrite an empty directory with another directory func TestDirOverwrite(t *testing.T) { dir1 := test_helpers.DefaultPlainDir + "/DirOverwrite1" dir2 := test_helpers.DefaultPlainDir + "/DirOverwrite2" err := os.Mkdir(dir1, 0777) if err != nil { t.Fatal(err) } err = os.Mkdir(dir2, 0777) if err != nil { t.Fatal(err) } err = os.Rename(dir1, dir2) if err != nil { t.Fatal(err) } } func TestLongNames(t *testing.T) { fi, err := ioutil.ReadDir(test_helpers.DefaultCipherDir) if err != nil { t.Fatal(err) } cnt1 := len(fi) wd := test_helpers.DefaultPlainDir + "/" // Create file with long name n255x := string(bytes.Repeat([]byte("x"), 255)) f, err := os.Create(wd + n255x) if err != nil { t.Fatalf("Could not create n255x: %v", err) } f.Close() if !test_helpers.VerifyExistence(wd + n255x) { t.Errorf("n255x is not in directory listing") } // Rename long to long n255y := string(bytes.Repeat([]byte("y"), 255)) err = os.Rename(wd+n255x, wd+n255y) if err != nil { t.Fatalf("Could not rename n255x to n255y: %v", err) } if !test_helpers.VerifyExistence(wd + n255y) { t.Errorf("n255y is not in directory listing") } // Rename long to short err = os.Rename(wd+n255y, wd+"short") if err != nil { t.Fatalf("Could not rename n255y to short: %v", err) } if !test_helpers.VerifyExistence(wd + "short") { t.Errorf("short is not in directory listing") } // Rename short to long err = os.Rename(wd+"short", wd+n255x) if err != nil { t.Fatalf("Could not rename short to n255x: %v", err) } if !test_helpers.VerifyExistence(wd + n255x) { t.Errorf("255x is not in directory listing II") } // Unlink err = syscall.Unlink(wd + n255x) if err != nil { t.Fatalf("Could not unlink n255x: %v", err) } if test_helpers.VerifyExistence(wd + n255x) { t.Errorf("n255x still there after unlink") } // Long symlink n255s := string(bytes.Repeat([]byte("s"), 255)) err = os.Symlink("/etc/motd", wd+n255s) if err != nil { t.Fatal(err) } if !test_helpers.VerifyExistence(wd + n255s) { t.Errorf("n255s is not in directory listing") } err = syscall.Unlink(wd + n255s) if err != nil { t.Error(err) } // Long dir n255d := string(bytes.Repeat([]byte("d"), 255)) err = os.Mkdir(wd+n255d, 0777) if err != nil { t.Fatal(err) } err = syscall.Rmdir(wd + n255d) if err != nil { t.Error(err) } // Check for orphaned files fi, err = ioutil.ReadDir(test_helpers.DefaultCipherDir) if err != nil { t.Fatal(err) } cnt2 := len(fi) if cnt1 != cnt2 { t.Errorf("Leftover files, cnt1=%d cnt2=%d", cnt1, cnt2) } } func TestLchown(t *testing.T) { name := test_helpers.DefaultPlainDir + "/symlink" err := os.Symlink("/target/does/not/exist", name) if err != nil { t.Fatal(err) } err = os.Chown(name, os.Getuid(), os.Getgid()) if err == nil { t.Error("Chown on dangling symlink should fail") } err = os.Lchown(name, os.Getuid(), os.Getgid()) if err != nil { t.Error(err) } }