// Like GosaDecrypt() but operates in-place on buf.
// Returns true if decryption successful and false if not.
// If false is returned, the buffer contents may be destroyed, but only
// if further decryption attempts with other keys would be pointless anyway,
// because of some fatal condition (such as the data not being a multiple of
// the cipher's block size).
func GosaDecryptBuffer(buf *bytes.Buffer, key string) bool {
buf.TrimSpace()
if buf.Len() < 11 {
return false
} // minimum length of unencrypted <xml></xml>
data := buf.Bytes()
if string(data[0:5]) == "<xml>" {
return true
}
// Fixes the following:
// * gosa-si bug in the following line:
// if( $client_answer =~ s/session_id=(\d+)$// ) {
// This leaves the "." before "session_id" which breaks base64
// * new gosa-si protocol has ";IP:PORT" appended to message
// which also breaks base64
for semicolon_period := 0; semicolon_period < len(data); semicolon_period++ {
if data[semicolon_period] == ';' || data[semicolon_period] == '.' {
buf.Trim(0, semicolon_period)
data = buf.Bytes()
break
}
}
aescipher, _ := aes.NewCipher([]byte(util.Md5sum(key)))
crypter := cipher.NewCBCDecrypter(aescipher, config.InitializationVector)
cryptotest := make([]byte, (((3*aes.BlockSize)+2)/3)<<2)
n := copy(cryptotest, data)
cryptotest = cryptotest[0:n]
cryptotest = util.Base64DecodeInPlace(cryptotest)
n = (len(cryptotest) / aes.BlockSize) * aes.BlockSize
cryptotest = cryptotest[0:n]
crypter.CryptBlocks(cryptotest, cryptotest)
if !strings.Contains(string(cryptotest), "<xml>") {
return false
}
data = util.Base64DecodeInPlace(data)
buf.Trim(0, len(data))
data = buf.Bytes()
if buf.Len()%aes.BlockSize != 0 {
// this condition is fatal => further decryption attempts are pointless
buf.Reset()
return false
}
crypter = cipher.NewCBCDecrypter(aescipher, config.InitializationVector)
crypter.CryptBlocks(data, data)
buf.TrimSpace() // removes 0 padding, too
return true
}
func testBuffer() {
var b bytes.Buffer
check(b.String(), "") // String() on fresh variable
b.Reset() // Reset() on fresh variable
check(b.String(), "") // String() after Reset()
b.Reset() // Reset() after Reset()
check(b.String(), "")
check(b.Len(), 0)
// same tests as above with pointer
b2 := &bytes.Buffer{}
check(b2.String(), "")
b2.Reset()
check(b2.String(), "")
b2.Reset()
check(b2.String(), "")
check(b2.Len(), 0)
b2.WriteString("Dies ist ein Test!")
check(b2.String(), "Dies ist ein Test!")
check(b2.Len(), 18)
n, err := b.Write(nil)
check(n, 0)
check(err, nil)
check(b.String(), "")
n, err = b.Write([]byte{})
check(n, 0)
check(err, nil)
check(b.String(), "")
check(b.Pointer(), nil)
check(b.Capacity(), 0)
check(b.Len(), 0)
func() {
defer func() {
check(recover(), bytes.ErrTooLarge)
}()
b.Grow(-1)
}()
n, err = b.Write([]byte{'a'})
check(n, 1)
check(err, nil)
check(b.String(), "a")
check(b.Capacity() >= 1, true)
check(b.Len(), 1)
check(b.Pointer() != nil, true)
check(b.Grow(11), 1)
check(b.Capacity() >= 12, true)
c := b.Capacity()
p := b.Pointer()
check(b.Grow(11), 1) // should not cause actual growth
check(b.Pointer(), p)
check(b.Capacity(), c)
check(b.Len(), 1)
((*[2]byte)(b.Pointer()))[1] = 'z'
check(b.Contains("z"), false)
n, err = b.WriteString("Hallo")
check(n, 5)
check(err, nil)
check(b.String(), "aHallo")
check(b.Pointer(), p)
check(b.Capacity(), c)
check(b.Len(), 6)
b.Reset()
check(b.String(), "")
check(b.Pointer(), nil)
check(b.Capacity(), 0)
check(b.Contains(""), true)
check(b.Contains("a"), false)
b.WriteString("Hallo")
b.WriteByte(' ')
b.Write([]byte{'d', 'i', 'e', 's'})
b.WriteByte(' ')
b.WriteString("ist ")
b.WriteString("ein ")
b.Write([]byte("Test"))
check(b.String(), "Hallo dies ist ein Test")
check(b.Contains("Hallo dies ist ein Test"), true)
check(b.Contains("Test"), true)
check(b.Contains("Hallo"), true)
check(b.Contains("allo"), true)
check(b.Contains(""), true)
check(b.Split(" "), []string{"Hallo", "dies", "ist", "ein", "Test"})
check(b.Split("X"), []string{"Hallo dies ist ein Test"})
check(b.Split("Hallo dies ist ein Test"), []string{"", ""})
check(b.Split("H"), []string{"", "allo dies ist ein Test"})
check(b.Split("Test"), []string{"Hallo dies ist ein ", ""})
check(b.Split("es"), []string{"Hallo di", " ist ein T", "t"})
b.Reset()
b.WriteString(" \n\t Hallo \t\v\n")
check(b.Len(), 15)
p = b.Pointer()
b.TrimSpace()
check(b.String(), "Hallo")
check(b.Len(), 5)
check(b.Pointer(), p)
b.Reset()
b.WriteString(" \n\t \t\v\n")
check(b.Len(), 10)
b.TrimSpace()
check(b.Pointer(), nil)
check(b.Len(), 0)
check(b.Capacity(), 0)
b.TrimSpace()
check(b.Pointer(), nil)
check(b.Len(), 0)
check(b.Capacity(), 0)
b.Reset()
b.WriteString(" \n\t Hallo")
check(b.Len(), 10)
p = b.Pointer()
b.TrimSpace()
check(b.String(), "Hallo")
check(b.Len(), 5)
check(b.Pointer(), p)
b.Reset()
b.WriteString("Hallo \t\v\n")
check(b.Len(), 10)
p = b.Pointer()
b.TrimSpace()
check(b.String(), "Hallo")
check(b.Len(), 5)
check(b.Pointer(), p)
b.Reset()
b.WriteString(" ")
check(b.Len(), 1)
b.TrimSpace()
check(b.Pointer(), nil)
check(b.Len(), 0)
check(b.Capacity(), 0)
b.Reset()
b.WriteString("Der Cottbuser Postkutscher kotzt in den Cottbuser Postkotzkasten")
n = b.Len()
c = b.Capacity()
p = b.Pointer()
b.Trim(-10, 2000)
check(b.Len(), n)
check(b.Capacity(), c)
check(b.Pointer(), p)
b.Trim(2000, -10)
check(b.Len(), 0)
check(b.Capacity(), 0)
check(b.Pointer(), nil)
b.WriteString("Der Cottbuser Postkutscher kotzt in den Cottbuser Postkotzkasten")
b.Trim(4, 4)
check(b.Len(), 0)
check(b.Capacity(), 0)
check(b.Pointer(), nil)
b.WriteString("Der Cottbuser Postkutscher kotzt in den Cottbuser Postkotzkasten")
n = b.Len()
c = b.Capacity()
p = b.Pointer()
b.Trim(0, b.Len()-6)
check(b.Len(), n-6)
check(b.Capacity(), c)
check(b.Pointer(), p)
check(b.String(), "Der Cottbuser Postkutscher kotzt in den Cottbuser Postkotz")
b.Trim(27, b.Len())
check(b.Len(), n-6-27)
check(b.Capacity(), c)
check(b.Pointer(), p)
check(b.String(), "kotzt in den Cottbuser Postkotz")
b.Trim(1, b.Len()-1)
check(b.Len(), n-6-27-2)
check(b.Capacity(), c)
check(b.Pointer(), p)
check(b.String(), "otzt in den Cottbuser Postkot")
b.Reset()
b.Write0(-1)
b.Write0(-100)
b.Write0(0)
check(b.Len(), 0)
check(b.Capacity(), 0)
check(b.Pointer(), nil)
b.Write0(1)
check(b.Len(), 1)
check(b.Capacity(), 1)
check(b.Bytes(), []byte{0})
b.WriteByte(111)
b.Write0(1)
b.WriteByte(222)
b.Write0(2)
b.WriteByte(99)
check(b.Len(), 7)
check(b.Bytes(), []byte{0, 111, 0, 222, 0, 0, 99})
b2.Reset()
slices := [][]byte{}
total := 0
numfakeerrs := 0
for total < 100000 {
c = rand.Intn(30000)
total += c
sl := make([]byte, c)
for i := range sl {
sl[i] = byte(rand.Intn(256))
}
slices = append(slices, sl)
b2.Write(sl)
if total/30000 > numfakeerrs {
slices = append(slices, nil)
numfakeerrs++
}
}
check(numfakeerrs, 3)
slcopy := make([][]byte, len(slices))
copy(slcopy, slices)
slret := &sliceReturner{Slices: slcopy}
b.Reset()
check(b.Capacity(), 0)
check(b.Len(), 0)
check(b.Pointer(), nil)
n = 0
for i := 0; i < numfakeerrs; i++ {
n64, err := b.ReadFrom(slret)
n += int(n64)
check(err, FakeError)
}
n64, err := b.ReadFrom(slret)
n += int(n64)
check(err, nil)
check(n, total)
check(b.Capacity() > b.Len(), true)
check(b.Len(), total)
contents := b.Bytes()
contents2 := b2.Bytes()
check(len(contents), len(contents2))
n = 0
for i := range contents {
if contents[i] != contents2[i] {
break
}
n++
}
check(n, total)
b2.Reset()
for i := range slices {
for k := range slices[i] {
slices[i][k] = 11
}
n, err = b.Read(slices[i])
check(n, len(slices[i]))
check(err, nil)
b2.Write(slices[i])
}
check(b2.Len(), total)
n, err = b.Read(slices[0])
check(n, 0)
check(err, io.EOF)
contents = b.Bytes()
contents2 = b2.Bytes()
check(len(contents), len(contents2))
n = 0
for i := range contents {
if contents[i] != contents2[i] {
break
}
n++
}
check(n, total)
b.WriteString("foo")
foo := make([]byte, 10)
n, err = b.Read(foo)
check(n, 3)
check(err, nil)
check(string(foo[0:3]), "foo")
n64, err = b.Seek(6700, 0)
check(n64, 6700)
check(err, nil)
n64, err = b.Seek(-6000, 1)
check(n64, 700)
check(err, nil)
n64, err = b.Seek(815, 1)
check(n64, 1515)
check(err, nil)
n, err = b.Read(foo)
check(n, len(foo))
check(err, nil)
check(foo, b2.Bytes()[1515:1515+len(foo)])
n64, err = b.Seek(-3, 2)
check(n64, total)
check(err, nil)
n, err = b.Read(foo)
check(n, 3)
check(err, nil)
check(string(foo[0:3]), "foo")
n64, err = b.Seek(999999, 0)
check(n64, b.Len())
check(err, nil)
n64, err = b.Seek(-3, 1)
check(n64, total)
check(err, nil)
n, err = b.Read(foo)
check(n, 3)
check(err, nil)
check(string(foo[0:3]), "foo")
n64, err = b.Seek(-815, 0)
check(n64, 0)
check(err, nil)
n, err = b.Read(foo)
check(n, len(foo))
check(err, nil)
check(foo, b2.Bytes()[0:len(foo)])
}