mirror of
https://github.com/wneessen/go-mail.git
synced 2024-11-15 02:12:55 +01:00
Add test server for SMTP authentication
Added a simple SMTP test server with basic features like PLAIN, LOGIN, and NOENC authentication. It can start, handle connections, and simulate authentication success or failure. Included support for TLS with a generated localhost certificate.
This commit is contained in:
parent
4221d48644
commit
b03fbb4ae8
1 changed files with 496 additions and 0 deletions
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@ -14,11 +14,69 @@
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package smtp
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import (
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"bufio"
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"bytes"
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"context"
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"crypto/tls"
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"errors"
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"fmt"
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"net"
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"strings"
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"sync/atomic"
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"testing"
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"time"
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)
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const (
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// TestServerProto is the protocol used for the simple SMTP test server
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TestServerProto = "tcp"
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// TestServerAddr is the address the simple SMTP test server listens on
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TestServerAddr = "127.0.0.1"
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// TestServerPortBase is the base port for the simple SMTP test server
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TestServerPortBase = 12025
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)
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// PortAdder is an atomic counter used to increment port numbers for the test SMTP server instances.
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var PortAdder atomic.Int32
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// localhostCert is a PEM-encoded TLS cert generated from src/crypto/tls:
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//
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// go run generate_cert.go --rsa-bits 1024 --host 127.0.0.1,::1,example.com \
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// --ca --start-date "Jan 1 00:00:00 1970" --duration=1000000h
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var localhostCert = []byte(`
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-----BEGIN CERTIFICATE-----
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MIICFDCCAX2gAwIBAgIRAK0xjnaPuNDSreeXb+z+0u4wDQYJKoZIhvcNAQELBQAw
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EjEQMA4GA1UEChMHQWNtZSBDbzAgFw03MDAxMDEwMDAwMDBaGA8yMDg0MDEyOTE2
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MDAwMFowEjEQMA4GA1UEChMHQWNtZSBDbzCBnzANBgkqhkiG9w0BAQEFAAOBjQAw
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gYkCgYEA0nFbQQuOWsjbGtejcpWz153OlziZM4bVjJ9jYruNw5n2Ry6uYQAffhqa
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JOInCmmcVe2siJglsyH9aRh6vKiobBbIUXXUU1ABd56ebAzlt0LobLlx7pZEMy30
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LqIi9E6zmL3YvdGzpYlkFRnRrqwEtWYbGBf3znO250S56CCWH2UCAwEAAaNoMGYw
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DgYDVR0PAQH/BAQDAgKkMBMGA1UdJQQMMAoGCCsGAQUFBwMBMA8GA1UdEwEB/wQF
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MAMBAf8wLgYDVR0RBCcwJYILZXhhbXBsZS5jb22HBH8AAAGHEAAAAAAAAAAAAAAA
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AAAAAAEwDQYJKoZIhvcNAQELBQADgYEAbZtDS2dVuBYvb+MnolWnCNqvw1w5Gtgi
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NmvQQPOMgM3m+oQSCPRTNGSg25e1Qbo7bgQDv8ZTnq8FgOJ/rbkyERw2JckkHpD4
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n4qcK27WkEDBtQFlPihIM8hLIuzWoi/9wygiElTy/tVL3y7fGCvY2/k1KBthtZGF
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tN8URjVmyEo=
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-----END CERTIFICATE-----`)
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// localhostKey is the private key for localhostCert.
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var localhostKey = []byte(testingKey(`
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-----BEGIN RSA TESTING KEY-----
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MIICXgIBAAKBgQDScVtBC45ayNsa16NylbPXnc6XOJkzhtWMn2Niu43DmfZHLq5h
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AB9+Gpok4icKaZxV7ayImCWzIf1pGHq8qKhsFshRddRTUAF3np5sDOW3QuhsuXHu
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lkQzLfQuoiL0TrOYvdi90bOliWQVGdGurAS1ZhsYF/fOc7bnRLnoIJYfZQIDAQAB
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AoGBAMst7OgpKyFV6c3JwyI/jWqxDySL3caU+RuTTBaodKAUx2ZEmNJIlx9eudLA
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kucHvoxsM/eRxlxkhdFxdBcwU6J+zqooTnhu/FE3jhrT1lPrbhfGhyKnUrB0KKMM
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VY3IQZyiehpxaeXAwoAou6TbWoTpl9t8ImAqAMY8hlULCUqlAkEA+9+Ry5FSYK/m
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542LujIcCaIGoG1/Te6Sxr3hsPagKC2rH20rDLqXwEedSFOpSS0vpzlPAzy/6Rbb
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PHTJUhNdwwJBANXkA+TkMdbJI5do9/mn//U0LfrCR9NkcoYohxfKz8JuhgRQxzF2
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6jpo3q7CdTuuRixLWVfeJzcrAyNrVcBq87cCQFkTCtOMNC7fZnCTPUv+9q1tcJyB
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vNjJu3yvoEZeIeuzouX9TJE21/33FaeDdsXbRhQEj23cqR38qFHsF1qAYNMCQQDP
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QXLEiJoClkR2orAmqjPLVhR3t2oB3INcnEjLNSq8LHyQEfXyaFfu4U9l5+fRPL2i
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jiC0k/9L5dHUsF0XZothAkEA23ddgRs+Id/HxtojqqUT27B8MT/IGNrYsp4DvS/c
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qgkeluku4GjxRlDMBuXk94xOBEinUs+p/hwP1Alll80Tpg==
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-----END RSA TESTING KEY-----`))
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type authTest struct {
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auth Auth
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challenges []string
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@ -302,6 +360,59 @@ func TestPlainAuth(t *testing.T) {
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t.Errorf("expected error to be: %s, got: %s", ErrUnexpectedServerChallange, err)
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}
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})
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t.Run("PLAIN authentication on test server", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH PLAIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := PlainAuth("", "user", "pass", TestServerAddr, false)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err != nil {
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t.Errorf("failed to authenticate to test server: %s", err)
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}
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})
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t.Run("PLAIN authentication on test server should fail", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH PLAIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FailOnAuth: true,
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := PlainAuth("", "user", "pass", TestServerAddr, false)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err == nil {
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t.Errorf("expected authentication to fail")
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}
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})
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}
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func TestPlainAuth_noEnc(t *testing.T) {
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@ -397,6 +508,59 @@ func TestPlainAuth_noEnc(t *testing.T) {
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t.Errorf("expected error to be: %s, got: %s", ErrUnexpectedServerChallange, err)
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}
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})
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t.Run("PLAIN-NOENC authentication on test server", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH PLAIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := PlainAuth("", "user", "pass", TestServerAddr, true)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err != nil {
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t.Errorf("failed to authenticate to test server: %s", err)
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}
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})
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t.Run("PLAIN-NOENC authentication on test server should fail", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH PLAIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FailOnAuth: true,
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := PlainAuth("", "user", "pass", TestServerAddr, true)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err == nil {
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t.Errorf("expected authentication to fail")
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}
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})
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}
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func TestLoginAuth(t *testing.T) {
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@ -488,6 +652,59 @@ func TestLoginAuth(t *testing.T) {
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}
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})
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}
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t.Run("LOGIN authentication on test server", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH LOGIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := LoginAuth("user", "pass", TestServerAddr, false)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err != nil {
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t.Errorf("failed to authenticate to test server: %s", err)
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}
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})
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t.Run("LOGIN authentication on test server should fail", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH LOGIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FailOnAuth: true,
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := LoginAuth("user", "pass", TestServerAddr, false)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err == nil {
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t.Errorf("expected authentication to fail")
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}
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})
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}
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func TestLoginAuth_noEnc(t *testing.T) {
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@ -576,6 +793,59 @@ func TestLoginAuth_noEnc(t *testing.T) {
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}
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})
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}
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t.Run("LOGIN-NOENC authentication on test server", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH LOGIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := LoginAuth("user", "pass", TestServerAddr, true)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err != nil {
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t.Errorf("failed to authenticate to test server: %s", err)
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}
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})
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t.Run("LOGIN-NOENC authentication on test server should fail", func(t *testing.T) {
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ctx, cancel := context.WithCancel(context.Background())
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defer cancel()
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PortAdder.Add(1)
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serverPort := int(TestServerPortBase + PortAdder.Load())
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featureSet := "250-AUTH LOGIN\r\n250-8BITMIME\r\n250-DSN\r\n250 SMTPUTF8"
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go func() {
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if err := simpleSMTPServer(ctx, t, &serverProps{
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FailOnAuth: true,
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FeatureSet: featureSet,
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ListenPort: serverPort},
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); err != nil {
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t.Errorf("failed to start test server: %s", err)
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return
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}
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}()
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time.Sleep(time.Millisecond * 30)
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auth := LoginAuth("user", "pass", TestServerAddr, true)
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client, err := Dial(fmt.Sprintf("%s:%d", TestServerAddr, serverPort))
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if err != nil {
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t.Fatalf("failed to connect to test server: %s", err)
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}
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if err = client.Auth(auth); err == nil {
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t.Errorf("expected authentication to fail")
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}
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})
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}
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/*
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@ -2746,3 +3016,229 @@ func startSMTPServer(tlsServer bool, hostname, port string, h func() hash.Hash)
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*/
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// testingKey replaces the substring "TESTING KEY" with "PRIVATE KEY" in the given string s.
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func testingKey(s string) string { return strings.ReplaceAll(s, "TESTING KEY", "PRIVATE KEY") }
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// serverProps represents the configuration properties for the SMTP server.
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type serverProps struct {
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FailOnAuth bool
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FailOnDataInit bool
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FailOnDataClose bool
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FailOnHelo bool
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FailOnMailFrom bool
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FailOnNoop bool
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FailOnQuit bool
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FailOnReset bool
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FailOnSTARTTLS bool
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FailTemp bool
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FeatureSet string
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ListenPort int
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SSLListener bool
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IsTLS bool
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SupportDSN bool
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}
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// simpleSMTPServer starts a simple TCP server that resonds to SMTP commands.
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// The provided featureSet represents in what the server responds to EHLO command
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// failReset controls if a RSET succeeds
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func simpleSMTPServer(ctx context.Context, t *testing.T, props *serverProps) error {
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t.Helper()
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if props == nil {
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return fmt.Errorf("no server properties provided")
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}
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var listener net.Listener
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var err error
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if props.SSLListener {
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keypair, err := tls.X509KeyPair(localhostCert, localhostKey)
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if err != nil {
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return fmt.Errorf("failed to read TLS keypair: %w", err)
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}
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tlsConfig := &tls.Config{Certificates: []tls.Certificate{keypair}}
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listener, err = tls.Listen(TestServerProto, fmt.Sprintf("%s:%d", TestServerAddr, props.ListenPort),
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tlsConfig)
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if err != nil {
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t.Fatalf("failed to create TLS listener: %s", err)
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}
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} else {
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listener, err = net.Listen(TestServerProto, fmt.Sprintf("%s:%d", TestServerAddr, props.ListenPort))
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}
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if err != nil {
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return fmt.Errorf("unable to listen on %s://%s: %w (SSL: %t)", TestServerProto, TestServerAddr, err,
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props.SSLListener)
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}
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defer func() {
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if err := listener.Close(); err != nil {
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t.Logf("failed to close listener: %s", err)
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}
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}()
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for {
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select {
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case <-ctx.Done():
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return nil
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default:
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connection, err := listener.Accept()
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var opErr *net.OpError
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if err != nil {
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if errors.As(err, &opErr) && opErr.Temporary() {
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continue
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}
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return fmt.Errorf("unable to accept connection: %w", err)
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}
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handleTestServerConnection(connection, t, props)
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}
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}
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}
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func handleTestServerConnection(connection net.Conn, t *testing.T, props *serverProps) {
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t.Helper()
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if !props.IsTLS {
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t.Cleanup(func() {
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if err := connection.Close(); err != nil {
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t.Logf("failed to close connection: %s", err)
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}
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})
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}
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reader := bufio.NewReader(connection)
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writer := bufio.NewWriter(connection)
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writeLine := func(data string) {
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_, err := writer.WriteString(data + "\r\n")
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if err != nil {
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t.Logf("failed to write line: %s", err)
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||||
}
|
||||
_ = writer.Flush()
|
||||
}
|
||||
writeOK := func() {
|
||||
writeLine("250 2.0.0 OK")
|
||||
}
|
||||
|
||||
if !props.IsTLS {
|
||||
writeLine("220 go-mail test server ready ESMTP")
|
||||
}
|
||||
|
||||
for {
|
||||
data, err := reader.ReadString('\n')
|
||||
if err != nil {
|
||||
break
|
||||
}
|
||||
time.Sleep(time.Millisecond)
|
||||
|
||||
var datastring string
|
||||
data = strings.TrimSpace(data)
|
||||
switch {
|
||||
case strings.HasPrefix(data, "EHLO"), strings.HasPrefix(data, "HELO"):
|
||||
if len(strings.Split(data, " ")) != 2 {
|
||||
writeLine("501 Syntax: EHLO hostname")
|
||||
break
|
||||
}
|
||||
if props.FailOnHelo {
|
||||
writeLine("500 5.5.2 Error: fail on HELO")
|
||||
break
|
||||
}
|
||||
writeLine("250-localhost.localdomain\r\n" + props.FeatureSet)
|
||||
case strings.HasPrefix(data, "MAIL FROM:"):
|
||||
if props.FailOnMailFrom {
|
||||
writeLine("500 5.5.2 Error: fail on MAIL FROM")
|
||||
break
|
||||
}
|
||||
from := strings.TrimPrefix(data, "MAIL FROM:")
|
||||
from = strings.ReplaceAll(from, "BODY=8BITMIME", "")
|
||||
from = strings.ReplaceAll(from, "SMTPUTF8", "")
|
||||
if props.SupportDSN {
|
||||
from = strings.ReplaceAll(from, "RET=FULL", "")
|
||||
}
|
||||
from = strings.TrimSpace(from)
|
||||
if !strings.EqualFold(from, "<valid-from@domain.tld>") {
|
||||
writeLine(fmt.Sprintf("503 5.1.2 Invalid from: %s", from))
|
||||
break
|
||||
}
|
||||
writeOK()
|
||||
case strings.HasPrefix(data, "RCPT TO:"):
|
||||
to := strings.TrimPrefix(data, "RCPT TO:")
|
||||
if props.SupportDSN {
|
||||
to = strings.ReplaceAll(to, "NOTIFY=FAILURE,SUCCESS", "")
|
||||
}
|
||||
to = strings.TrimSpace(to)
|
||||
if !strings.EqualFold(to, "<valid-to@domain.tld>") {
|
||||
writeLine(fmt.Sprintf("500 5.1.2 Invalid to: %s", to))
|
||||
break
|
||||
}
|
||||
writeOK()
|
||||
case strings.HasPrefix(data, "AUTH"):
|
||||
if props.FailOnAuth {
|
||||
writeLine("535 5.7.8 Error: authentication failed")
|
||||
break
|
||||
}
|
||||
writeLine("235 2.7.0 Authentication successful")
|
||||
case strings.EqualFold(data, "DATA"):
|
||||
if props.FailOnDataInit {
|
||||
writeLine("503 5.5.1 Error: fail on DATA init")
|
||||
break
|
||||
}
|
||||
writeLine("354 End data with <CR><LF>.<CR><LF>")
|
||||
for {
|
||||
ddata, derr := reader.ReadString('\n')
|
||||
if derr != nil {
|
||||
t.Logf("failed to read data from connection: %s", derr)
|
||||
break
|
||||
}
|
||||
ddata = strings.TrimSpace(ddata)
|
||||
if ddata == "." {
|
||||
if props.FailOnDataClose {
|
||||
writeLine("500 5.0.0 Error during DATA transmission")
|
||||
break
|
||||
}
|
||||
if props.FailTemp {
|
||||
writeLine("451 4.3.0 Error: fail on DATA close")
|
||||
break
|
||||
}
|
||||
writeLine("250 2.0.0 Ok: queued as 1234567890")
|
||||
break
|
||||
}
|
||||
datastring += ddata + "\n"
|
||||
}
|
||||
case strings.EqualFold(data, "noop"):
|
||||
if props.FailOnNoop {
|
||||
writeLine("500 5.0.0 Error: fail on NOOP")
|
||||
break
|
||||
}
|
||||
writeOK()
|
||||
case strings.EqualFold(data, "vrfy"):
|
||||
writeOK()
|
||||
case strings.EqualFold(data, "rset"):
|
||||
if props.FailOnReset {
|
||||
writeLine("500 5.1.2 Error: reset failed")
|
||||
break
|
||||
}
|
||||
writeOK()
|
||||
case strings.EqualFold(data, "quit"):
|
||||
if props.FailOnQuit {
|
||||
writeLine("500 5.1.2 Error: quit failed")
|
||||
break
|
||||
}
|
||||
writeLine("221 2.0.0 Bye")
|
||||
return
|
||||
case strings.EqualFold(data, "starttls"):
|
||||
if props.FailOnSTARTTLS {
|
||||
writeLine("500 5.1.2 Error: starttls failed")
|
||||
break
|
||||
}
|
||||
keypair, err := tls.X509KeyPair(localhostCert, localhostKey)
|
||||
if err != nil {
|
||||
writeLine("500 5.1.2 Error: starttls failed - " + err.Error())
|
||||
break
|
||||
}
|
||||
writeLine("220 Ready to start TLS")
|
||||
tlsConfig := &tls.Config{Certificates: []tls.Certificate{keypair}}
|
||||
connection = tls.Server(connection, tlsConfig)
|
||||
props.IsTLS = true
|
||||
handleTestServerConnection(connection, t, props)
|
||||
default:
|
||||
writeLine("500 5.5.2 Error: bad syntax")
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
Loading…
Reference in a new issue