/
smtp_test.go
1065 lines (955 loc) · 26.8 KB
/
smtp_test.go
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// 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 mail
import (
"bufio"
"bytes"
"crypto/tls"
"crypto/x509"
"io"
"net"
"net/textproto"
"strings"
"testing"
"time"
)
type authTest struct {
auth auth
challenges []string
name string
responses []string
}
var authTests = []authTest{
{plainAuthfn("", "user", "pass", "testserver"), []string{}, "PLAIN", []string{"\x00user\x00pass"}},
{plainAuthfn("foo", "bar", "baz", "testserver"), []string{}, "PLAIN", []string{"foo\x00bar\x00baz"}},
{loginAuthfn("", "bar", "baz", "testserver"), []string{}, "LOGIN", []string{"bar"}},
{loginAuthfn("foo", "bar", "baz", "testserver"), []string{}, "LOGIN", []string{"bar"}},
{cramMD5Authfn("user", "pass"), []string{"<123456.1322876914@testserver>"}, "CRAM-MD5", []string{"", "user 287eb355114cf5c471c26a875f1ca4ae"}},
}
func TestAuth(t *testing.T) {
testLoop:
for i, test := range authTests {
name, resp, err := test.auth.start(&serverInfo{"testserver", true, nil})
if name != test.name {
t.Errorf("#%d got name %s, expected %s", i, name, test.name)
}
if !bytes.Equal(resp, []byte(test.responses[0])) {
t.Errorf("#%d got response %s, expected %s", i, resp, test.responses[0])
}
if err != nil {
t.Errorf("#%d error: %s", i, err)
}
for j := range test.challenges {
challenge := []byte(test.challenges[j])
expected := []byte(test.responses[j+1])
resp, err := test.auth.next(challenge, true)
if err != nil {
t.Errorf("#%d error: %s", i, err)
continue testLoop
}
if !bytes.Equal(resp, expected) {
t.Errorf("#%d got %s, expected %s", i, resp, expected)
continue testLoop
}
}
}
}
func TestAuthPlain(t *testing.T) {
tests := []struct {
authName string
server *serverInfo
err string
}{
{
authName: "servername",
server: &serverInfo{name: "servername", tls: true},
},
{
// OK to use plainAuthfn on localhost without TLS
authName: "localhost",
server: &serverInfo{name: "localhost", tls: false},
},
{
authName: "servername",
server: &serverInfo{name: "attacker", tls: true},
err: "wrong host name",
},
}
for i, tt := range tests {
auth := plainAuthfn("foo", "bar", "baz", tt.authName)
_, _, err := auth.start(tt.server)
got := ""
if err != nil {
got = err.Error()
}
if got != tt.err {
t.Errorf("%d. got error = %q; want %q", i, got, tt.err)
}
}
}
func TestAuthLogin(t *testing.T) {
tests := []struct {
authName string
server *serverInfo
err string
}{
{
authName: "servername",
server: &serverInfo{name: "servername", tls: true},
},
{
// OK to use loginAuthfn on localhost without TLS
authName: "localhost",
server: &serverInfo{name: "localhost", tls: false},
},
{
authName: "servername",
server: &serverInfo{name: "attacker", tls: true},
err: "wrong host name",
},
}
for i, tt := range tests {
auth := loginAuthfn("foo", "bar", "baz", tt.authName)
_, _, err := auth.start(tt.server)
got := ""
if err != nil {
got = err.Error()
}
if got != tt.err {
t.Errorf("%d. got error = %q; want %q", i, got, tt.err)
}
}
}
// Issue https://github.com/golang/go/issues/17794: don't send a trailing space on AUTH command when there's no password.
func TestClientAuthTrimSpace(t *testing.T) {
server := "220 hello world\r\n" +
"200 some more"
var wrote bytes.Buffer
var fake faker
fake.ReadWriter = struct {
io.Reader
io.Writer
}{
strings.NewReader(server),
&wrote,
}
c, err := newClient(fake, "fake.host")
if err != nil {
t.Fatalf("NewClient: %v", err)
}
c.tls = true
c.didHello = true
c.authenticate(toServerEmptyAuth{})
c.close()
if got, want := wrote.String(), "AUTH FOOAUTH\r\n*\r\nQUIT\r\n"; got != want {
t.Errorf("wrote %q; want %q", got, want)
}
}
// toServerEmptyAuth is an implementation of Auth that only implements
// the Start method, and returns "FOOAUTH", nil, nil. Notably, it returns
// zero bytes for "toServer" so we can test that we don't send spaces at
// the end of the line. See TestClientAuthTrimSpace.
type toServerEmptyAuth struct{}
func (toServerEmptyAuth) start(server *serverInfo) (proto string, toServer []byte, err error) {
return "FOOAUTH", nil, nil
}
func (toServerEmptyAuth) next(fromServer []byte, more bool) (toServer []byte, err error) {
panic("unexpected call")
}
type faker struct {
io.ReadWriter
}
func (f faker) Close() error { return nil }
func (f faker) LocalAddr() net.Addr { return nil }
func (f faker) RemoteAddr() net.Addr { return nil }
func (f faker) SetDeadline(time.Time) error { return nil }
func (f faker) SetReadDeadline(time.Time) error { return nil }
func (f faker) SetWriteDeadline(time.Time) error { return nil }
func TestBasic(t *testing.T) {
server := strings.Join(strings.Split(basicServer, "\n"), "\r\n")
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
var cmdbuf bytes.Buffer
bcmdbuf := bufio.NewWriter(&cmdbuf)
var fake faker
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
c := &smtpClient{text: textproto.NewConn(fake), localName: "localhost"}
if err := c.helo(); err != nil {
t.Fatalf("HELO failed: %s", err)
}
if err := c.ehlo(); err == nil {
t.Fatalf("Expected first EHLO to fail")
}
if err := c.ehlo(); err != nil {
t.Fatalf("Second EHLO failed: %s", err)
}
c.didHello = true
if ok, args := c.extension("aUtH"); !ok || args != "LOGIN PLAIN" {
t.Fatalf("Expected AUTH supported")
}
if ok, _ := c.extension("DSN"); ok {
t.Fatalf("Shouldn't support DSN")
}
if err := c.mail("user@gmail.com"); err == nil {
t.Fatalf("MAIL should require authentication")
}
if err := c.verify("user1@gmail.com"); err == nil {
t.Fatalf("First VRFY: expected no verification")
}
if err := c.verify("user2@gmail.com>\r\nDATA\r\nAnother injected message body\r\n.\r\nQUIT\r\n"); err == nil {
t.Fatalf("VRFY should have failed due to a message injection attempt")
}
if err := c.verify("user2@gmail.com"); err != nil {
t.Fatalf("Second VRFY: expected verification, got %s", err)
}
// fake TLS so authentication won't complain
c.tls = true
c.serverName = "smtp.google.com"
if err := c.authenticate(plainAuthfn("", "user", "pass", "smtp.google.com")); err != nil {
t.Fatalf("AUTH failed: %s", err)
}
if err := c.rcpt("golang-nuts@googlegroups.com>\r\nDATA\r\nInjected message body\r\n.\r\nQUIT\r\n", ""); err == nil {
t.Fatalf("RCPT should have failed due to a message injection attempt")
}
if err := c.mail("user@gmail.com>\r\nDATA\r\nAnother injected message body\r\n.\r\nQUIT\r\n"); err == nil {
t.Fatalf("MAIL should have failed due to a message injection attempt")
}
if err := c.mail("user@gmail.com"); err != nil {
t.Fatalf("MAIL failed: %s", err)
}
if err := c.rcpt("golang-nuts@googlegroups.com", ""); err != nil {
t.Fatalf("RCPT failed: %s", err)
}
msg := `From: user@gmail.com
To: golang-nuts@googlegroups.com
Subject: Hooray for Go
Line 1
.Leading dot line .
Goodbye.`
w, err := c.data()
if err != nil {
t.Fatalf("DATA failed: %s", err)
}
if _, err := w.Write([]byte(msg)); err != nil {
t.Fatalf("Data write failed: %s", err)
}
if err := w.Close(); err != nil {
t.Fatalf("Bad data response: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
}
var basicServer = `250 mx.google.com at your service
502 Unrecognized command.
250-mx.google.com at your service
250-SIZE 35651584
250-AUTH LOGIN PLAIN
250 8BITMIME
530 Authentication required
252 Send some mail, I'll try my best
250 User is valid
235 Accepted
250 Sender OK
250 Receiver OK
354 Go ahead
250 Data OK
221 OK
`
var basicClient = `HELO localhost
EHLO localhost
EHLO localhost
MAIL FROM:<user@gmail.com> BODY=8BITMIME
VRFY user1@gmail.com
VRFY user2@gmail.com
AUTH PLAIN AHVzZXIAcGFzcw==
MAIL FROM:<user@gmail.com> BODY=8BITMIME
RCPT TO:<golang-nuts@googlegroups.com>
DATA
From: user@gmail.com
To: golang-nuts@googlegroups.com
Subject: Hooray for Go
Line 1
..Leading dot line .
Goodbye.
.
QUIT
`
func TestExtensions(t *testing.T) {
faker := func(server string) (c *smtpClient, bcmdbuf *bufio.Writer, cmdbuf *bytes.Buffer) {
server = strings.Join(strings.Split(server, "\n"), "\r\n")
cmdbuf = &bytes.Buffer{}
bcmdbuf = bufio.NewWriter(cmdbuf)
var fake faker
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
c = &smtpClient{text: textproto.NewConn(fake), localName: "localhost"}
return c, bcmdbuf, cmdbuf
}
t.Run("helo", func(t *testing.T) {
const (
basicServer = `250 mx.google.com at your service
250 Sender OK
221 Goodbye
`
basicClient = `HELO localhost
MAIL FROM:<user@gmail.com>
QUIT
`
)
c, bcmdbuf, cmdbuf := faker(basicServer)
if err := c.helo(); err != nil {
t.Fatalf("HELO failed: %s", err)
}
c.didHello = true
if err := c.mail("user@gmail.com"); err != nil {
t.Fatalf("MAIL FROM failed: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
})
t.Run("ehlo", func(t *testing.T) {
const (
basicServer = `250-mx.google.com at your service
250 SIZE 35651584
250 Sender OK
221 Goodbye
`
basicClient = `EHLO localhost
MAIL FROM:<user@gmail.com>
QUIT
`
)
c, bcmdbuf, cmdbuf := faker(basicServer)
if err := c.hi("localhost"); err != nil {
t.Fatalf("EHLO failed: %s", err)
}
if ok, _ := c.extension("8BITMIME"); ok {
t.Fatalf("Shouldn't support 8BITMIME")
}
if ok, _ := c.extension("SMTPUTF8"); ok {
t.Fatalf("Shouldn't support SMTPUTF8")
}
if err := c.mail("user@gmail.com"); err != nil {
t.Fatalf("MAIL FROM failed: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
})
t.Run("ehlo size", func(t *testing.T) {
const (
basicServer = `250-mx.google.com at your service
250-SIZE 35651584
250 user@gmail.com OK; can accommodate 500000 byte message
250 Sender OK
221 Goodbye
`
basicClient = `EHLO localhost
MAIL FROM:<user@gmail.com> SIZE=50000
QUIT
`
)
c, bcmdbuf, cmdbuf := faker(basicServer)
cmdArgs := make(map[string]string)
if err := c.hi("localhost"); err != nil {
t.Fatalf("EHLO failed: %s", err)
}
if ok, _ := c.extension("SIZE"); !ok {
t.Fatalf("Should support SIZE")
}
if ok, _ := c.extension("SMTPUTF8"); ok {
t.Fatalf("Shouldn't support SMTPUTF8")
}
if ok, _ := c.extension("SIZE"); ok {
cmdArgs["SIZE"] = "50000"
}
if err := c.mail("user@gmail.com", cmdArgs); err != nil {
t.Fatalf("MAIL FROM failed: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
})
t.Run("ehlo 8bitmime", func(t *testing.T) {
const (
basicServer = `250-mx.google.com at your service
250-SIZE 35651584
250 8BITMIME
250 Sender OK
221 Goodbye
`
basicClient = `EHLO localhost
MAIL FROM:<user@gmail.com> BODY=8BITMIME
QUIT
`
)
c, bcmdbuf, cmdbuf := faker(basicServer)
if err := c.hi("localhost"); err != nil {
t.Fatalf("EHLO failed: %s", err)
}
if ok, _ := c.extension("8BITMIME"); !ok {
t.Fatalf("Should support 8BITMIME")
}
if ok, _ := c.extension("SMTPUTF8"); ok {
t.Fatalf("Shouldn't support SMTPUTF8")
}
if err := c.mail("user@gmail.com"); err != nil {
t.Fatalf("MAIL FROM failed: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
})
t.Run("ehlo smtputf8", func(t *testing.T) {
const (
basicServer = `250-mx.google.com at your service
250-SIZE 35651584
250 SMTPUTF8
250 Sender OK
221 Goodbye
`
basicClient = `EHLO localhost
MAIL FROM:<user+📧@gmail.com> SMTPUTF8
QUIT
`
)
c, bcmdbuf, cmdbuf := faker(basicServer)
if err := c.hi("localhost"); err != nil {
t.Fatalf("EHLO failed: %s", err)
}
if ok, _ := c.extension("8BITMIME"); ok {
t.Fatalf("Shouldn't support 8BITMIME")
}
if ok, _ := c.extension("SMTPUTF8"); !ok {
t.Fatalf("Should support SMTPUTF8")
}
if err := c.mail("user+📧@gmail.com"); err != nil {
t.Fatalf("MAIL FROM failed: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
})
t.Run("ehlo 8bitmime smtputf8", func(t *testing.T) {
const (
basicServer = `250-mx.google.com at your service
250-SIZE 35651584
250-8BITMIME
250 SMTPUTF8
250 Sender OK
221 Goodbye
`
basicClient = `EHLO localhost
MAIL FROM:<user+📧@gmail.com> BODY=8BITMIME SMTPUTF8
QUIT
`
)
c, bcmdbuf, cmdbuf := faker(basicServer)
if err := c.hi("localhost"); err != nil {
t.Fatalf("EHLO failed: %s", err)
}
c.didHello = true
if ok, _ := c.extension("8BITMIME"); !ok {
t.Fatalf("Should support 8BITMIME")
}
if ok, _ := c.extension("SMTPUTF8"); !ok {
t.Fatalf("Should support SMTPUTF8")
}
if err := c.mail("user+📧@gmail.com"); err != nil {
t.Fatalf("MAIL FROM failed: %s", err)
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
client := strings.Join(strings.Split(basicClient, "\n"), "\r\n")
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
})
}
func TestNewClient(t *testing.T) {
server := strings.Join(strings.Split(newClientServer, "\n"), "\r\n")
client := strings.Join(strings.Split(newClientClient, "\n"), "\r\n")
var cmdbuf bytes.Buffer
bcmdbuf := bufio.NewWriter(&cmdbuf)
out := func() string {
bcmdbuf.Flush()
return cmdbuf.String()
}
var fake faker
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
c, err := newClient(fake, "fake.host")
if err != nil {
t.Fatalf("NewClient: %v\n(after %v)", err, out())
}
defer c.close()
if ok, args := c.extension("aUtH"); !ok || args != "LOGIN PLAIN" {
t.Fatalf("Expected AUTH supported")
}
if ok, _ := c.extension("DSN"); ok {
t.Fatalf("Shouldn't support DSN")
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
actualcmds := out()
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
}
var newClientServer = `220 hello world
250-mx.google.com at your service
250-SIZE 35651584
250-AUTH LOGIN PLAIN
250 8BITMIME
221 OK
`
var newClientClient = `EHLO localhost
QUIT
`
func TestNewClient2(t *testing.T) {
server := strings.Join(strings.Split(newClient2Server, "\n"), "\r\n")
client := strings.Join(strings.Split(newClient2Client, "\n"), "\r\n")
var cmdbuf bytes.Buffer
bcmdbuf := bufio.NewWriter(&cmdbuf)
var fake faker
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
c, err := newClient(fake, "fake.host")
if err != nil {
t.Fatalf("NewClient: %v", err)
}
defer c.close()
if ok, _ := c.extension("DSN"); ok {
t.Fatalf("Shouldn't support DSN")
}
if err := c.quit(); err != nil {
t.Fatalf("QUIT failed: %s", err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
if client != actualcmds {
t.Fatalf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
}
var newClient2Server = `220 hello world
502 EH?
250-mx.google.com at your service
250-SIZE 35651584
250-AUTH LOGIN PLAIN
250 8BITMIME
221 OK
`
var newClient2Client = `EHLO localhost
HELO localhost
QUIT
`
func TestNewClientWithTLS(t *testing.T) {
cert, err := tls.X509KeyPair(localhostCert, localhostKey)
if err != nil {
t.Fatalf("loadcert: %v", err)
}
config := tls.Config{Certificates: []tls.Certificate{cert}}
ln, err := tls.Listen("tcp", "127.0.0.1:0", &config)
if err != nil {
ln, err = tls.Listen("tcp", "[::1]:0", &config)
if err != nil {
t.Fatalf("server: listen: %v", err)
}
}
go func() {
conn, errAccept := ln.Accept()
if errAccept != nil {
t.Errorf("server: accept: %v", errAccept)
return
}
defer conn.Close()
_, errWrite := conn.Write([]byte("220 SIGNS\r\n"))
if errWrite != nil {
t.Errorf("server: write: %v", errWrite)
return
}
}()
config.InsecureSkipVerify = true
conn, err := tls.Dial("tcp", ln.Addr().String(), &config)
if err != nil {
t.Fatalf("client: dial: %v", err)
}
defer conn.Close()
client, err := newClient(conn, ln.Addr().String())
if err != nil {
t.Fatalf("smtp: newclient: %v", err)
}
if !client.tls {
t.Errorf("client.tls Got: %t Expected: %t", client.tls, true)
}
}
func TestHello(t *testing.T) {
if len(helloServer) != len(helloClient) {
t.Fatalf("Hello server and client size mismatch")
}
for i := 0; i < len(helloServer); i++ {
server := strings.Join(strings.Split(baseHelloServer+helloServer[i], "\n"), "\r\n")
client := strings.Join(strings.Split(baseHelloClient+helloClient[i], "\n"), "\r\n")
var cmdbuf bytes.Buffer
bcmdbuf := bufio.NewWriter(&cmdbuf)
var fake faker
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
c, err := newClient(fake, "fake.host")
if err != nil {
t.Fatalf("NewClient: %v", err)
}
defer c.close()
c.localName = "customhost"
err = nil
switch i {
case 0:
err = c.hi("hostinjection>\n\rDATA\r\nInjected message body\r\n.\r\nQUIT\r\n")
if err == nil {
t.Errorf("Expected Hello to be rejected due to a message injection attempt")
}
err = c.hi("customhost")
case 1:
err = c.startTLS(nil)
if err.Error() == "502 Not implemented" {
err = nil
}
case 2:
err = c.verify("test@example.com")
case 3:
c.tls = true
c.serverName = "smtp.google.com"
err = c.authenticate(plainAuthfn("", "user", "pass", "smtp.google.com"))
case 4:
err = c.mail("test@example.com")
case 5:
ok, _ := c.extension("feature")
if ok {
t.Errorf("Expected FEATURE not to be supported")
}
case 6:
err = c.reset()
case 7:
err = c.quit()
case 8:
err = c.verify("test@example.com")
if err != nil {
err = c.hi("customhost")
if err != nil {
t.Errorf("Want error, got none")
}
}
case 9:
err = c.noop()
default:
t.Fatalf("Unhandled command")
}
if err != nil {
t.Errorf("Command %d failed: %v", i, err)
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
if client != actualcmds {
t.Errorf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
}
}
// verify checks the validity of an email address on the server.
// If verify returns nil, the address is valid. A non-nil return
// does not necessarily indicate an invalid address. Many servers
// will not verify addresses for security reasons.
func (c *smtpClient) verify(addr string) error {
if err := validateLine(addr); err != nil {
return err
}
if err := c.hello(); err != nil {
return err
}
_, _, err := c.cmd(250, "VRFY %s", addr)
return err
}
var baseHelloServer = `220 hello world
502 EH?
250-mx.google.com at your service
250 FEATURE
`
var helloServer = []string{
"",
"502 Not implemented\n",
"250 User is valid\n",
"235 Accepted\n",
"250 Sender ok\n",
"",
"250 Reset ok\n",
"221 Goodbye\n",
"250 Sender ok\n",
"250 ok\n",
}
var baseHelloClient = `EHLO customhost
HELO customhost
`
var helloClient = []string{
"",
"STARTTLS\n",
"VRFY test@example.com\n",
"AUTH PLAIN AHVzZXIAcGFzcw==\n",
"MAIL FROM:<test@example.com>\n",
"",
"RSET\n",
"QUIT\n",
"VRFY test@example.com\n",
"NOOP\n",
}
func TestAuthFailed(t *testing.T) {
server := strings.Join(strings.Split(authFailedServer, "\n"), "\r\n")
client := strings.Join(strings.Split(authFailedClient, "\n"), "\r\n")
var cmdbuf bytes.Buffer
bcmdbuf := bufio.NewWriter(&cmdbuf)
var fake faker
fake.ReadWriter = bufio.NewReadWriter(bufio.NewReader(strings.NewReader(server)), bcmdbuf)
c, err := newClient(fake, "fake.host")
if err != nil {
t.Fatalf("NewClient: %v", err)
}
defer c.close()
c.tls = true
c.serverName = "smtp.google.com"
err = c.authenticate(plainAuthfn("", "user", "pass", "smtp.google.com"))
if err == nil {
t.Error("Auth: expected error; got none")
} else if err.Error() != "535 Invalid credentials\nplease see www.example.com" {
t.Errorf("Auth: got error: %v, want: %s", err, "535 Invalid credentials\nplease see www.example.com")
}
bcmdbuf.Flush()
actualcmds := cmdbuf.String()
if client != actualcmds {
t.Errorf("Got:\n%s\nExpected:\n%s", actualcmds, client)
}
}
var authFailedServer = `220 hello world
250-mx.google.com at your service
250 AUTH LOGIN PLAIN
535-Invalid credentials
535 please see www.example.com
221 Goodbye
`
var authFailedClient = `EHLO localhost
AUTH PLAIN AHVzZXIAcGFzcw==
*
QUIT
`
func TestTLSConnState(t *testing.T) {
ln := newLocalListener(t)
defer ln.Close()
clientDone := make(chan bool)
serverDone := make(chan bool)
go func() {
defer close(serverDone)
c, err := ln.Accept()
if err != nil {
t.Errorf("Server accept: %v", err)
return
}
defer c.Close()
if err := serverHandle(c, t); err != nil {
t.Errorf("server error: %v", err)
}
}()
go func() {
defer close(clientDone)
c, err := dialer(ln.Addr().String())
if err != nil {
t.Errorf("Client dial: %v", err)
return
}
defer c.quit()
cfg := &tls.Config{ServerName: "example.com"}
testHookStartTLS(cfg) // set the RootCAs
if err := c.startTLS(cfg); err != nil {
t.Errorf("StartTLS: %v", err)
return
}
cs, ok := c.tlsConnectionState()
if !ok {
t.Errorf("TLSConnectionState returned ok == false; want true")
return
}
if cs.Version == 0 || !cs.HandshakeComplete {
t.Errorf("ConnectionState = %#v; expect non-zero Version and HandshakeComplete", cs)
}
}()
<-clientDone
<-serverDone
}
var testHookStartTLS func(*tls.Config)
// dialer returns a new Client connected to an SMTP server at addr.
// The addr must include a port, as in "mail.example.com:smtp".
func dialer(addr string) (*smtpClient, error) {
conn, err := net.Dial("tcp", addr)
if err != nil {
return nil, err
}
host, _, _ := net.SplitHostPort(addr)
return newClient(conn, host)
}
// TLSConnectionState returns the client's TLS connection state.
// The return values are their zero values if StartTLS did
// not succeed.
func (c *smtpClient) tlsConnectionState() (state tls.ConnectionState, ok bool) {
tc, ok := c.conn.(*tls.Conn)
if !ok {
return
}
return tc.ConnectionState(), true
}
func newLocalListener(t *testing.T) net.Listener {
ln, err := net.Listen("tcp", "127.0.0.1:0")
if err != nil {
ln, err = net.Listen("tcp6", "[::1]:0")
}
if err != nil {
t.Fatal(err)
}
return ln
}
type smtpSender struct {
w io.Writer
}
func (s smtpSender) send(f string) {
s.w.Write([]byte(f + "\r\n"))
}
// smtp server, finely tailored to deal with our own client only!
func serverHandle(c net.Conn, t *testing.T) error {
send := smtpSender{c}.send
send("220 127.0.0.1 ESMTP service ready")
s := bufio.NewScanner(c)
for s.Scan() {
switch s.Text() {
case "EHLO localhost":
send("250-127.0.0.1 ESMTP offers a warm hug of welcome")
send("250-STARTTLS")
send("250 Ok")
case "STARTTLS":
send("220 Go ahead")
keypair, err := tls.X509KeyPair(localhostCert, localhostKey)
if err != nil {
return err
}
config := &tls.Config{Certificates: []tls.Certificate{keypair}}
c = tls.Server(c, config)
defer c.Close()
return serverHandleTLS(c, t)
default:
t.Fatalf("unrecognized command: %q", s.Text())
}
}
return s.Err()
}
func serverHandleTLS(c net.Conn, t *testing.T) error {
send := smtpSender{c}.send
s := bufio.NewScanner(c)
for s.Scan() {
switch s.Text() {
case "EHLO localhost":
send("250 Ok")
case "MAIL FROM:<joe1@example.com>":
send("250 Ok")
case "RCPT TO:<joe2@example.com>":