mirror of
https://blitiri.com.ar/repos/chasquid
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test: Update fuzz tests to use the built-in infrastructure
Go 1.18 supports fuzzing natively, so this patch migrates our fuzzing tests to make use of it.
This commit is contained in:
Alberto Bertogli
@@ -3,6 +3,7 @@ package smtpsrv
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import (
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"bufio"
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"net"
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"os"
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"strings"
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"testing"
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@@ -15,7 +16,12 @@ import (
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func TestSecLevel(t *testing.T) {
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// We can't simulate this externally because of the SPF record
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// requirement, so do a narrow test on Conn.secLevelCheck.
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dir := testlib.MustTempDir(t)
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// Create the directory by hand because we don't want to automatically
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// chdir into it (it affects the fuzzing infrastructure).
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dir, err := os.MkdirTemp("", "testlib_")
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if err != nil {
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t.Fatalf("Failed to create temp dir: %v\n", dir)
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}
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defer testlib.RemoveIfOk(t, dir)
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dinfo, err := domaininfo.New(dir)
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@@ -1,280 +0,0 @@
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// Fuzz testing for package smtpsrv. Based on server_test.
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//go:build gofuzz
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// +build gofuzz
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package smtpsrv
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import (
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"bufio"
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"bytes"
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"crypto/rand"
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"crypto/rsa"
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"crypto/tls"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"flag"
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"fmt"
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"io"
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"math/big"
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"net"
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"net/textproto"
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"os"
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"strings"
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"time"
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"blitiri.com.ar/go/chasquid/internal/aliases"
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"blitiri.com.ar/go/chasquid/internal/courier"
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"blitiri.com.ar/go/chasquid/internal/testlib"
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"blitiri.com.ar/go/chasquid/internal/userdb"
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"blitiri.com.ar/go/log"
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)
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var (
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// Server addresses. Will be filled in at init time.
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smtpAddr = ""
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submissionAddr = ""
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submissionTLSAddr = ""
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// TLS configuration to use in the clients.
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// Will contain the generated server certificate as root CA.
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tlsConfig *tls.Config
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)
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//
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// === Fuzz test ===
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//
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func Fuzz(data []byte) int {
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// Byte 0: mode
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// The rest is what we will send the server, one line per command.
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if len(data) < 1 {
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return 0
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}
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var mode SocketMode
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addr := ""
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switch data[0] {
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case '0':
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mode = ModeSMTP
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addr = smtpAddr
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case '1':
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mode = ModeSubmission
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addr = submissionAddr
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case '2':
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mode = ModeSubmissionTLS
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addr = submissionTLSAddr
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default:
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return 0
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}
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data = data[1:]
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var err error
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var conn net.Conn
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if mode.TLS {
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conn, err = tls.Dial("tcp", addr, tlsConfig)
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} else {
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conn, err = net.Dial("tcp", addr)
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}
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if err != nil {
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panic(fmt.Errorf("failed to dial: %v", err))
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}
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defer conn.Close()
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tconn := textproto.NewConn(conn)
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defer tconn.Close()
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scanner := bufio.NewScanner(bytes.NewBuffer(data))
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for scanner.Scan() {
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line := scanner.Text()
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cmd := strings.TrimSpace(strings.ToUpper(line))
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// Skip STARTTLS if it happens on a non-TLS connection - the jump is
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// not going to happen via fuzzer, it will just cause a timeout (which
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// is considered a crash).
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if cmd == "STARTTLS" && !mode.TLS {
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continue
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}
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if err = tconn.PrintfLine(line); err != nil {
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break
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}
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if _, _, err = tconn.ReadResponse(-1); err != nil {
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break
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}
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if cmd == "DATA" {
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// We just sent DATA and got a response; send the contents.
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err = exchangeData(scanner, tconn)
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if err != nil {
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break
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}
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}
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}
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if (err != nil && err != io.EOF) || scanner.Err() != nil {
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return 1
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}
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return 0
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}
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func exchangeData(scanner *bufio.Scanner, tconn *textproto.Conn) error {
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for scanner.Scan() {
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line := scanner.Text()
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if err := tconn.PrintfLine(line); err != nil {
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return err
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}
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if line == "." {
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break
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}
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}
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// Read the "." response.
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_, _, err := tconn.ReadResponse(-1)
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return err
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}
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//
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// === Test environment ===
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//
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// generateCert generates a new, INSECURE self-signed certificate and writes
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// it to a pair of (cert.pem, key.pem) files to the given path.
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// Note the certificate is only useful for testing purposes.
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func generateCert(path string) error {
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tmpl := x509.Certificate{
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SerialNumber: big.NewInt(1234),
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Subject: pkix.Name{
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Organization: []string{"chasquid_test.go"},
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},
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DNSNames: []string{"localhost"},
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IPAddresses: []net.IP{net.ParseIP("127.0.0.1")},
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(24 * time.Hour),
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KeyUsage: x509.KeyUsageKeyEncipherment |
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x509.KeyUsageDigitalSignature |
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x509.KeyUsageCertSign,
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BasicConstraintsValid: true,
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IsCA: true,
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}
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priv, err := rsa.GenerateKey(rand.Reader, 1024)
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if err != nil {
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return err
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}
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derBytes, err := x509.CreateCertificate(
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rand.Reader, &tmpl, &tmpl, &priv.PublicKey, priv)
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if err != nil {
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return err
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}
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// Create a global config for convenience.
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srvCert, err := x509.ParseCertificate(derBytes)
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if err != nil {
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return err
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}
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rootCAs := x509.NewCertPool()
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rootCAs.AddCert(srvCert)
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tlsConfig = &tls.Config{
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ServerName: "localhost",
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RootCAs: rootCAs,
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}
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certOut, err := os.Create(path + "/cert.pem")
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if err != nil {
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return err
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}
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defer certOut.Close()
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pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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keyOut, err := os.OpenFile(
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path+"/key.pem", os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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defer keyOut.Close()
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block := &pem.Block{
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Type: "RSA PRIVATE KEY",
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Bytes: x509.MarshalPKCS1PrivateKey(priv),
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}
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pem.Encode(keyOut, block)
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return nil
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}
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// waitForServer waits 10 seconds for the server to start, and returns an error
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// if it fails to do so.
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// It does this by repeatedly connecting to the address until it either
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// replies or times out. Note we do not do any validation of the reply.
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func waitForServer(addr string) {
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start := time.Now()
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for time.Since(start) < 10*time.Second {
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conn, err := net.Dial("tcp", addr)
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if err == nil {
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conn.Close()
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return
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}
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time.Sleep(100 * time.Millisecond)
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}
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panic(fmt.Errorf("%v not reachable", addr))
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}
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func init() {
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flag.Parse()
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log.Default.Level = log.Error
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// Generate certificates in a temporary directory.
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tmpDir, err := os.MkdirTemp("", "chasquid_smtpsrv_fuzz:")
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if err != nil {
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panic(fmt.Errorf("Failed to create temp dir: %v\n", tmpDir))
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}
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defer os.RemoveAll(tmpDir)
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err = generateCert(tmpDir)
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if err != nil {
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panic(fmt.Errorf("Failed to generate cert for testing: %v\n", err))
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}
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smtpAddr = testlib.GetFreePort()
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submissionAddr = testlib.GetFreePort()
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submissionTLSAddr = testlib.GetFreePort()
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s := NewServer()
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s.Hostname = "localhost"
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s.MaxDataSize = 50 * 1024 * 1025
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s.AddCerts(tmpDir+"/cert.pem", tmpDir+"/key.pem")
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s.AddAddr(smtpAddr, ModeSMTP)
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s.AddAddr(submissionAddr, ModeSubmission)
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s.AddAddr(submissionTLSAddr, ModeSubmissionTLS)
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localC := &courier.MDA{}
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remoteC := &courier.SMTP{}
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s.InitQueue(tmpDir+"/queue", localC, remoteC)
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s.InitDomainInfo(tmpDir + "/domaininfo")
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udb := userdb.New("/dev/null")
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udb.AddUser("testuser", "testpasswd")
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s.aliasesR.AddAliasForTesting(
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"to@localhost", "testuser@localhost", aliases.EMAIL)
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s.AddDomain("localhost")
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s.AddUserDB("localhost", udb)
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// Disable SPF lookups, to avoid leaking DNS queries.
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disableSPFForTesting = true
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go s.ListenAndServe()
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waitForServer(smtpAddr)
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waitForServer(submissionAddr)
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waitForServer(submissionTLSAddr)
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}
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96
internal/smtpsrv/fuzz_test.go
Normal file
96
internal/smtpsrv/fuzz_test.go
Normal file
@@ -0,0 +1,96 @@
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// Fuzz testing for package smtpsrv. Based on server_test.
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package smtpsrv
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import (
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"bufio"
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"bytes"
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"crypto/tls"
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"fmt"
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"net"
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"net/textproto"
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"strings"
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"testing"
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)
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func fuzzConnection(t *testing.T, modeI int, data []byte) {
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var mode SocketMode
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addr := ""
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switch modeI {
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case 0:
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mode = ModeSMTP
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addr = smtpAddr
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case 1:
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mode = ModeSubmission
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addr = submissionAddr
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case 2:
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mode = ModeSubmissionTLS
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addr = submissionTLSAddr
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default:
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mode = ModeSMTP
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addr = smtpAddr
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}
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var err error
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var conn net.Conn
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if mode.TLS {
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conn, err = tls.Dial("tcp", addr, tlsConfig)
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} else {
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conn, err = net.Dial("tcp", addr)
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}
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if err != nil {
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panic(fmt.Errorf("failed to dial: %v", err))
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}
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defer conn.Close()
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tconn := textproto.NewConn(conn)
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defer tconn.Close()
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scanner := bufio.NewScanner(bytes.NewBuffer(data))
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for scanner.Scan() {
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line := scanner.Text()
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cmd := strings.TrimSpace(strings.ToUpper(line))
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// Skip STARTTLS if it happens on a non-TLS connection - the jump is
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// not going to happen via fuzzer, it will just cause a timeout (which
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// is considered a crash).
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if cmd == "STARTTLS" && !mode.TLS {
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continue
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}
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if err = tconn.PrintfLine(line); err != nil {
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break
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}
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if _, _, err = tconn.ReadResponse(-1); err != nil {
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break
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}
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if cmd == "DATA" {
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// We just sent DATA and got a response; send the contents.
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err = exchangeData(scanner, tconn)
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if err != nil {
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break
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}
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}
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}
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}
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func FuzzConnection(f *testing.F) {
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f.Fuzz(fuzzConnection)
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}
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func exchangeData(scanner *bufio.Scanner, tconn *textproto.Conn) error {
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for scanner.Scan() {
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line := scanner.Text()
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if err := tconn.PrintfLine(line); err != nil {
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return err
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}
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if line == "." {
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break
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}
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}
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// Read the "." response.
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_, _, err := tconn.ReadResponse(-1)
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return err
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}
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@@ -0,0 +1,3 @@
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go test fuzz v1
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int(0)
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[]byte("HELO localhost\nMAIL FROM:<test@testy.com>\nRCPT LALA: <>\nRCPT TO:\nRCPT TO:<pepe>\nRCPT TO:<a@xn--->\nRCPT TO:<henryⅣ@testserver>\nRCPT TO:<aaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaX@bbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbX>\n")
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@@ -0,0 +1,3 @@
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go test fuzz v1
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int(0)
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[]byte("DATA\nHELO localhost\nDATA\nMAIL FROM:<a@b>\nRCPT TO: user@testserver\nDATA\nFrom: Mailer daemon <somewhere@horns.com>\nSubject: I've come to haunt you\nBad header\n\nMuahahahaha\n\n\n.\nQUIT\n")
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@@ -0,0 +1,3 @@
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go test fuzz v1
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int(0)
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[]byte("EHLO localhost\nMAIL FROM: <>\nRCPT TO: user@testserver\nDATA\nFrom: Mailer daemon <somewhere@báratro>\nSubject: I've come to haunt you\nMessage-ID: <booooo>\n\nÑañañañaña!\n\n\n.\nQUIT\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(0)
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[]byte("HELO localhost\nMAIL LALA: <>\nMAIL FROM:\nMAIL FROM:<pepe>\nMAIL FROM:<a@xn--->\nMAIL FROM:<aaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaX@bbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbX>\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(0)
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[]byte("HELO\nEHLO\nHELO localhost\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(0)
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[]byte("HELO localhost\nQUIT\n")
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(0)
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[]byte("EHLO localhost\nMAIL FROM: <>\nRCPT TO: user@testserver\nDATA\nFrom: Mailer daemon <somewhere@horns.com>\nSubject: I've come to haunt you\n\nMuahahahaha\n\n\n.\nQUIT\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
|
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int(0)
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[]byte("EHLO localhost\nAUTH PLAIN something\nAUTH PLAIN something\nAUTH PLAIN something\nAUTH PLAIN something\nAUTH PLAIN something\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(0)
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[]byte("EHLO localhost\nWHATISTHIS\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(0)
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[]byte("EHLO localhost\nAUTH PLAIN\n")
|
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@@ -0,0 +1,3 @@
|
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go test fuzz v1
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int(2)
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[]byte("EHLO localhost\nAUTH SOMETHINGELSE\nAUTH PLAIN\ndXNlckB0ZXN0c2VydmVyAHlalala==\nAUTH PLAIN\ndXNlckB0ZXN0c2VydmVyAHVzZXJAdGVzdHNlcnZlcgB3cm9uZ3Bhc3N3b3Jk\nAUTH PLAIN\ndXNlckB0ZXN0c2VydmVyAHVzZXJAdGVzdHNlcnZlcgBzZWNyZXRwYXNzd29yZA==\nAUTH PLAIN\n")
|
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@@ -1,9 +0,0 @@
|
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2EHLO localhost
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AUTH SOMETHINGELSE
|
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AUTH PLAIN
|
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dXNlckB0ZXN0c2VydmVyAHlalala==
|
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AUTH PLAIN
|
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dXNlckB0ZXN0c2VydmVyAHVzZXJAdGVzdHNlcnZlcgB3cm9uZ3Bhc3N3b3Jk
|
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AUTH PLAIN
|
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dXNlckB0ZXN0c2VydmVyAHVzZXJAdGVzdHNlcnZlcgBzZWNyZXRwYXNzd29yZA==
|
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AUTH PLAIN
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@@ -1,2 +0,0 @@
|
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0EHLO localhost
|
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AUTH PLAIN
|
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@@ -1,6 +0,0 @@
|
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0EHLO localhost
|
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AUTH PLAIN something
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AUTH PLAIN something
|
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AUTH PLAIN something
|
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AUTH PLAIN something
|
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AUTH PLAIN something
|
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15
internal/smtpsrv/testdata/fuzz/corpus/t-bad_data
vendored
15
internal/smtpsrv/testdata/fuzz/corpus/t-bad_data
vendored
@@ -1,15 +0,0 @@
|
||||
0DATA
|
||||
HELO localhost
|
||||
DATA
|
||||
MAIL FROM:<a@b>
|
||||
RCPT TO: user@testserver
|
||||
DATA
|
||||
From: Mailer daemon <somewhere@horns.com>
|
||||
Subject: I've come to haunt you
|
||||
Bad header
|
||||
|
||||
Muahahahaha
|
||||
|
||||
|
||||
.
|
||||
QUIT
|
||||
@@ -1,6 +0,0 @@
|
||||
0HELO localhost
|
||||
MAIL LALA: <>
|
||||
MAIL FROM:
|
||||
MAIL FROM:<pepe>
|
||||
MAIL FROM:<a@xn--->
|
||||
MAIL FROM:<aaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaX@bbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbX>
|
||||
@@ -1,8 +0,0 @@
|
||||
0HELO localhost
|
||||
MAIL FROM:<test@testy.com>
|
||||
RCPT LALA: <>
|
||||
RCPT TO:
|
||||
RCPT TO:<pepe>
|
||||
RCPT TO:<a@xn--->
|
||||
RCPT TO:<henryⅣ@testserver>
|
||||
RCPT TO:<aaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaXaaaa5aaaaX@bbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbXbbbb5bbbbX>
|
||||
@@ -1,3 +0,0 @@
|
||||
0HELO
|
||||
EHLO
|
||||
HELO localhost
|
||||
2
internal/smtpsrv/testdata/fuzz/corpus/t-helo
vendored
2
internal/smtpsrv/testdata/fuzz/corpus/t-helo
vendored
@@ -1,2 +0,0 @@
|
||||
0HELO localhost
|
||||
QUIT
|
||||
@@ -1,13 +0,0 @@
|
||||
0EHLO localhost
|
||||
MAIL FROM: <>
|
||||
RCPT TO: user@testserver
|
||||
DATA
|
||||
From: Mailer daemon <somewhere@báratro>
|
||||
Subject: I've come to haunt you
|
||||
Message-ID: <booooo>
|
||||
|
||||
Ñañañañaña!
|
||||
|
||||
|
||||
.
|
||||
QUIT
|
||||
12
internal/smtpsrv/testdata/fuzz/corpus/t-sendmail
vendored
12
internal/smtpsrv/testdata/fuzz/corpus/t-sendmail
vendored
@@ -1,12 +0,0 @@
|
||||
0EHLO localhost
|
||||
MAIL FROM: <>
|
||||
RCPT TO: user@testserver
|
||||
DATA
|
||||
From: Mailer daemon <somewhere@horns.com>
|
||||
Subject: I've come to haunt you
|
||||
|
||||
Muahahahaha
|
||||
|
||||
|
||||
.
|
||||
QUIT
|
||||
@@ -1,2 +0,0 @@
|
||||
0EHLO localhost
|
||||
WHATISTHIS
|
||||
Reference in New Issue
Block a user