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Source file src/crypto/tls/conn_test.go

Documentation: crypto/tls

  // Copyright 2010 The Go Authors. All rights reserved.
  // Use of this source code is governed by a BSD-style
  // license that can be found in the LICENSE file.
  
  package tls
  
  import (
  	"bytes"
  	"io"
  	"net"
  	"testing"
  )
  
  func TestRoundUp(t *testing.T) {
  	if roundUp(0, 16) != 0 ||
  		roundUp(1, 16) != 16 ||
  		roundUp(15, 16) != 16 ||
  		roundUp(16, 16) != 16 ||
  		roundUp(17, 16) != 32 {
  		t.Error("roundUp broken")
  	}
  }
  
  var paddingTests = []struct {
  	in          []byte
  	good        bool
  	expectedLen int
  }{
  	{[]byte{1, 2, 3, 4, 0}, true, 4},
  	{[]byte{1, 2, 3, 4, 0, 1}, false, 0},
  	{[]byte{1, 2, 3, 4, 99, 99}, false, 0},
  	{[]byte{1, 2, 3, 4, 1, 1}, true, 4},
  	{[]byte{1, 2, 3, 2, 2, 2}, true, 3},
  	{[]byte{1, 2, 3, 3, 3, 3}, true, 2},
  	{[]byte{1, 2, 3, 4, 3, 3}, false, 0},
  	{[]byte{1, 4, 4, 4, 4, 4}, true, 1},
  	{[]byte{5, 5, 5, 5, 5, 5}, true, 0},
  	{[]byte{6, 6, 6, 6, 6, 6}, false, 0},
  }
  
  func TestRemovePadding(t *testing.T) {
  	for i, test := range paddingTests {
  		paddingLen, good := extractPadding(test.in)
  		expectedGood := byte(255)
  		if !test.good {
  			expectedGood = 0
  		}
  		if good != expectedGood {
  			t.Errorf("#%d: wrong validity, want:%d got:%d", i, expectedGood, good)
  		}
  		if good == 255 && len(test.in)-paddingLen != test.expectedLen {
  			t.Errorf("#%d: got %d, want %d", i, len(test.in)-paddingLen, test.expectedLen)
  		}
  	}
  }
  
  var certExampleCom = `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`
  
  var certWildcardExampleCom = `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`
  
  var certFooExampleCom = `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`
  
  var certDoubleWildcardExampleCom = `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`
  
  func TestCertificateSelection(t *testing.T) {
  	config := Config{
  		Certificates: []Certificate{
  			{
  				Certificate: [][]byte{fromHex(certExampleCom)},
  			},
  			{
  				Certificate: [][]byte{fromHex(certWildcardExampleCom)},
  			},
  			{
  				Certificate: [][]byte{fromHex(certFooExampleCom)},
  			},
  			{
  				Certificate: [][]byte{fromHex(certDoubleWildcardExampleCom)},
  			},
  		},
  	}
  
  	config.BuildNameToCertificate()
  
  	pointerToIndex := func(c *Certificate) int {
  		for i := range config.Certificates {
  			if c == &config.Certificates[i] {
  				return i
  			}
  		}
  		return -1
  	}
  
  	certificateForName := func(name string) *Certificate {
  		clientHello := &ClientHelloInfo{
  			ServerName: name,
  		}
  		if cert, err := config.getCertificate(clientHello); err != nil {
  			t.Errorf("unable to get certificate for name '%s': %s", name, err)
  			return nil
  		} else {
  			return cert
  		}
  	}
  
  	if n := pointerToIndex(certificateForName("example.com")); n != 0 {
  		t.Errorf("example.com returned certificate %d, not 0", n)
  	}
  	if n := pointerToIndex(certificateForName("bar.example.com")); n != 1 {
  		t.Errorf("bar.example.com returned certificate %d, not 1", n)
  	}
  	if n := pointerToIndex(certificateForName("foo.example.com")); n != 2 {
  		t.Errorf("foo.example.com returned certificate %d, not 2", n)
  	}
  	if n := pointerToIndex(certificateForName("foo.bar.example.com")); n != 3 {
  		t.Errorf("foo.bar.example.com returned certificate %d, not 3", n)
  	}
  	if n := pointerToIndex(certificateForName("foo.bar.baz.example.com")); n != 0 {
  		t.Errorf("foo.bar.baz.example.com returned certificate %d, not 0", n)
  	}
  }
  
  // Run with multiple crypto configs to test the logic for computing TLS record overheads.
  func runDynamicRecordSizingTest(t *testing.T, config *Config) {
  	clientConn, serverConn := net.Pipe()
  
  	serverConfig := config.Clone()
  	serverConfig.DynamicRecordSizingDisabled = false
  	tlsConn := Server(serverConn, serverConfig)
  
  	recordSizesChan := make(chan []int, 1)
  	go func() {
  		// This goroutine performs a TLS handshake over clientConn and
  		// then reads TLS records until EOF. It writes a slice that
  		// contains all the record sizes to recordSizesChan.
  		defer close(recordSizesChan)
  		defer clientConn.Close()
  
  		tlsConn := Client(clientConn, config)
  		if err := tlsConn.Handshake(); err != nil {
  			t.Errorf("Error from client handshake: %v", err)
  			return
  		}
  
  		var recordHeader [recordHeaderLen]byte
  		var record []byte
  		var recordSizes []int
  
  		for {
  			n, err := io.ReadFull(clientConn, recordHeader[:])
  			if err == io.EOF {
  				break
  			}
  			if err != nil || n != len(recordHeader) {
  				t.Errorf("io.ReadFull = %d, %v", n, err)
  				return
  			}
  
  			length := int(recordHeader[3])<<8 | int(recordHeader[4])
  			if len(record) < length {
  				record = make([]byte, length)
  			}
  
  			n, err = io.ReadFull(clientConn, record[:length])
  			if err != nil || n != length {
  				t.Errorf("io.ReadFull = %d, %v", n, err)
  				return
  			}
  
  			// The last record will be a close_notify alert, which
  			// we don't wish to record.
  			if recordType(recordHeader[0]) == recordTypeApplicationData {
  				recordSizes = append(recordSizes, recordHeaderLen+length)
  			}
  		}
  
  		recordSizesChan <- recordSizes
  	}()
  
  	if err := tlsConn.Handshake(); err != nil {
  		t.Fatalf("Error from server handshake: %s", err)
  	}
  
  	// The server writes these plaintexts in order.
  	plaintext := bytes.Join([][]byte{
  		bytes.Repeat([]byte("x"), recordSizeBoostThreshold),
  		bytes.Repeat([]byte("y"), maxPlaintext*2),
  		bytes.Repeat([]byte("z"), maxPlaintext),
  	}, nil)
  
  	if _, err := tlsConn.Write(plaintext); err != nil {
  		t.Fatalf("Error from server write: %s", err)
  	}
  	if err := tlsConn.Close(); err != nil {
  		t.Fatalf("Error from server close: %s", err)
  	}
  
  	recordSizes := <-recordSizesChan
  	if recordSizes == nil {
  		t.Fatalf("Client encountered an error")
  	}
  
  	// Drop the size of last record, which is likely to be truncated.
  	recordSizes = recordSizes[:len(recordSizes)-1]
  
  	// recordSizes should contain a series of records smaller than
  	// tcpMSSEstimate followed by some larger than maxPlaintext.
  	seenLargeRecord := false
  	for i, size := range recordSizes {
  		if !seenLargeRecord {
  			if size > (i+1)*tcpMSSEstimate {
  				t.Fatalf("Record #%d has size %d, which is too large too soon", i, size)
  			}
  			if size >= maxPlaintext {
  				seenLargeRecord = true
  			}
  		} else if size <= maxPlaintext {
  			t.Fatalf("Record #%d has size %d but should be full sized", i, size)
  		}
  	}
  
  	if !seenLargeRecord {
  		t.Fatalf("No large records observed")
  	}
  }
  
  func TestDynamicRecordSizingWithStreamCipher(t *testing.T) {
  	config := testConfig.Clone()
  	config.CipherSuites = []uint16{TLS_RSA_WITH_RC4_128_SHA}
  	runDynamicRecordSizingTest(t, config)
  }
  
  func TestDynamicRecordSizingWithCBC(t *testing.T) {
  	config := testConfig.Clone()
  	config.CipherSuites = []uint16{TLS_RSA_WITH_AES_256_CBC_SHA}
  	runDynamicRecordSizingTest(t, config)
  }
  
  func TestDynamicRecordSizingWithAEAD(t *testing.T) {
  	config := testConfig.Clone()
  	config.CipherSuites = []uint16{TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256}
  	runDynamicRecordSizingTest(t, config)
  }
  
  // hairpinConn is a net.Conn that makes a “hairpin” call when closed, back into
  // the tls.Conn which is calling it.
  type hairpinConn struct {
  	net.Conn
  	tlsConn *Conn
  }
  
  func (conn *hairpinConn) Close() error {
  	conn.tlsConn.ConnectionState()
  	return nil
  }
  
  func TestHairpinInClose(t *testing.T) {
  	// This tests that the underlying net.Conn can call back into the
  	// tls.Conn when being closed without deadlocking.
  	client, server := net.Pipe()
  	defer server.Close()
  	defer client.Close()
  
  	conn := &hairpinConn{client, nil}
  	tlsConn := Server(conn, &Config{
  		GetCertificate: func(*ClientHelloInfo) (*Certificate, error) {
  			panic("unreachable")
  		},
  	})
  	conn.tlsConn = tlsConn
  
  	// This call should not deadlock.
  	tlsConn.Close()
  }
  

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