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fix(instance-admin): enable SMTP test emails #405
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -5,15 +5,17 @@ import ( | |
| "crypto/tls" | ||
| "fmt" | ||
| "log/slog" | ||
| "net" | ||
| "net/smtp" | ||
| "strconv" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/Devlaner/devlane/api/internal/crypto" | ||
| "github.com/Devlaner/devlane/api/internal/store" | ||
| ) | ||
|
|
||
| type SMTPSettings struct { | ||
| Host string | ||
| Port int | ||
| SenderEmail string | ||
|
|
@@ -22,7 +24,7 @@ type smtpSettings struct { | |
| Password string | ||
| } | ||
|
|
||
| func getEmailSettings(ctx context.Context, s *store.InstanceSettingStore) (*SMTPSettings, error) { | ||
| row, err := s.Get(ctx, "email") | ||
| if err != nil || row == nil { | ||
| return nil, fmt.Errorf("email settings not found") | ||
|
|
@@ -55,7 +57,7 @@ func getEmailSettings(ctx context.Context, s *store.InstanceSettingStore) (*smtp | |
| if host == "" { | ||
| return nil, fmt.Errorf("email host not configured") | ||
| } | ||
| return &SMTPSettings{ | ||
| Host: host, | ||
| Port: port, | ||
| SenderEmail: strings.TrimSpace(sender), | ||
|
|
@@ -78,63 +80,131 @@ func NewSMTPEmailSender(instanceSettings *store.InstanceSettingStore, log *slog. | |
| LogSkip(log, "instance email not configured", to, err) | ||
| return err | ||
| } | ||
| if err := SendWithSMTPSettings(ctx, cfg, to, subject, body, log); err != nil { | ||
| return err | ||
| } | ||
| return nil | ||
| } | ||
| } | ||
|
|
||
| var smtpSendTimeout = 15 * time.Second | ||
|
|
||
| // SendWithSMTPSettings sends an email using the supplied SMTP settings without persisting them. | ||
| func SendWithSMTPSettings(ctx context.Context, cfg *SMTPSettings, to, subject, body string, log *slog.Logger) error { | ||
| if cfg == nil { | ||
| return fmt.Errorf("SMTP settings not configured") | ||
| } | ||
| if ctx == nil { | ||
| ctx = context.Background() | ||
| } | ||
| ctx, cancel := context.WithTimeout(ctx, smtpSendTimeout) | ||
| defer cancel() | ||
|
|
||
| from := cfg.SenderEmail | ||
| if from == "" { | ||
| from = cfg.Username | ||
| } | ||
| if from == "" { | ||
| LogSkip(log, "sender_email and username empty", to, fmt.Errorf("sender not set")) | ||
| return fmt.Errorf("sender email not configured") | ||
| } | ||
| addr := fmt.Sprintf("%s:%d", cfg.Host, cfg.Port) | ||
| auth := newSMTPAuth(cfg.Host, cfg.Username, cfg.Password) | ||
| msg := buildMessage(to, from, subject, body) | ||
| return sendMailWithConfig(ctx, addr, cfg.Host, cfg.Port, cfg.Security, auth, from, to, msg) | ||
| } | ||
|
|
||
| func newSMTPAuth(host, username, password string) smtp.Auth { | ||
| if username == "" { | ||
| return nil | ||
| } | ||
| return smtp.PlainAuth("", username, password, host) | ||
| } | ||
|
|
||
| // sendMailWithConfig sends email using the configured SMTP security mode: | ||
| // TLS requires STARTTLS, SSL uses implicit TLS, and None sends plaintext. | ||
| // Dialing honors ctx, and its deadline bounds every SMTP read and write. | ||
| func sendMailWithConfig(ctx context.Context, addr, host string, port int, security string, auth smtp.Auth, from, to string, msg []byte) error { | ||
| security = strings.ToUpper(strings.TrimSpace(security)) | ||
| if security == "" { | ||
| security = "TLS" | ||
| } | ||
| switch security { | ||
| case "TLS", "SSL", "NONE": | ||
| default: | ||
| return fmt.Errorf("unsupported SMTP security setting %q", security) | ||
| } | ||
|
|
||
| conn, err := (&net.Dialer{}).DialContext(ctx, "tcp", addr) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| defer conn.Close() | ||
| if deadline, ok := ctx.Deadline(); ok { | ||
| if err := conn.SetDeadline(deadline); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| stopCancel := context.AfterFunc(ctx, func() { | ||
| _ = conn.SetDeadline(time.Now()) | ||
| }) | ||
| defer stopCancel() | ||
|
|
||
| var client *smtp.Client | ||
| if security == "SSL" { | ||
| tlsConn := tls.Client(conn, &tls.Config{ServerName: host}) | ||
| if err := tlsConn.HandshakeContext(ctx); err != nil { | ||
| return err | ||
| } | ||
| if client, err = smtp.NewClient(tlsConn, host); err != nil { | ||
| return err | ||
| } | ||
| } else { | ||
| if client, err = smtp.NewClient(conn, host); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| defer client.Close() | ||
|
|
||
| switch security { | ||
| case "TLS": | ||
| if ok, _ := client.Extension("STARTTLS"); !ok { | ||
| return fmt.Errorf("SMTP server does not support STARTTLS") | ||
| } | ||
| if err := client.StartTLS(&tls.Config{ServerName: host}); err != nil { | ||
| return err | ||
| } | ||
| case "NONE": | ||
| // The explicit None setting opts out of Go's opportunistic STARTTLS. | ||
| } | ||
|
|
||
| if err := sendMailWithClient(client, auth, from, to, msg); err != nil { | ||
| return err | ||
| } | ||
| return client.Quit() | ||
| } | ||
|
|
||
| func sendMailWithClient(client *smtp.Client, auth smtp.Auth, from, to string, msg []byte) error { | ||
| if auth != nil { | ||
| if err := client.Auth(auth); err != nil { | ||
| return err | ||
| } | ||
| } | ||
| if err := client.Mail(from); err != nil { | ||
| return err | ||
|
Comment on lines
+180
to
+194
Contributor
There was a problem hiding this comment. 🔒 Security & Privacy | 🟠 Major | ⚡ Quick win 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -eu
printf '%s\n' '--- handler security validation and call ---'
rg -n -C 8 'Security|SendWithSMTPSettings' apps/api/internal/handler/instance.go
printf '%s\n' '--- SMTP sender implementation ---'
rg -n -C 12 'func sendMailWithConfig|StartTLS|NewClient|Dial|client\.Mail|client\.Auth' apps/api/internal/mail/mail.goRepository: Devlaner/devlane Length of output: 4354 Security Misconfiguration Reachability: External Reject TLS-mode servers that do not advertise STARTTLS. The test-email endpoint accepts Proposed fix if ok, _ := client.Extension("STARTTLS"); ok {
if err := client.StartTLS(&tls.Config{ServerName: host}); err != nil {
return err
}
+ } else if strings.EqualFold(strings.TrimSpace(security), "TLS") {
+ return fmt.Errorf("SMTP server does not support STARTTLS")
}🤖 Prompt for AI Agents |
||
| } | ||
| if err := client.Rcpt(to); err != nil { | ||
| return err | ||
| } | ||
| w, err := client.Data() | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if _, err := w.Write(msg); err != nil { | ||
| _ = w.Close() | ||
| return err | ||
| } | ||
| return w.Close() | ||
| } | ||
|
|
||
| // sanitizeHeader removes CR/LF to prevent header injection. | ||
|
|
||
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📐 Maintainability & Code Quality | 🟠 Major | 🏗️ Heavy lift
Route SMTP test delivery through an application service.
The
apps/api/guidance defines the layering rule as “handler → service → store” and describes handlers as HTTP-shape code that binds requests, calls services, and returns JSON.SendTestEmailinstead performs SMTP delivery by callingmail.SendWithSMTPSettingsdirectly. Move this operation into an instance email service, then call that service from the handler.🤖 Prompt for AI Agents