diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..29963da --- /dev/null +++ b/.gitignore @@ -0,0 +1 @@ +/.direnv/ diff --git a/cmd/inbound/inbound.go b/cmd/inbound/inbound.go index fd579c0..a04e0bf 100644 --- a/cmd/inbound/inbound.go +++ b/cmd/inbound/inbound.go @@ -1,12 +1,97 @@ package main -import "flag" +import ( + "context" + "crypto/tls" + "encoding/json" + "flag" + "os" + "os/signal" + "syscall" + "time" -var listenPort int + "github.com/emersion/go-milter" + "github.com/emersion/go-smtp" + "go.uber.org/zap" + "golang.org/x/time/rate" + + localtls "git.cycore.io/cycore/mail/pkg/tls" + "git.cycore.io/cycore/mail/server" +) + +var ( + listenPort int + healthPort int +) + +var allowedDomains []string func init() { flag.IntVar(&listenPort, "p", 2525, "port on which to listen for incoming emails") + flag.IntVar(&healthPort, "p", 8080, "port on which to listen for health checks") } func main() { + var err error + var log *zap.Logger + + ctx, cancel := signal.NotifyContext(context.Background(), os.Interrupt, syscall.SIGTERM) + defer cancel() + + if _, ok := os.LookupEnv("DEBUG"); ok { + log, err = zap.NewDevelopment() + } else { + log, err = zap.NewProduction() + } + + if err != nil { + panic("failed to instantiate logger: " + err.Error()) + } + + if v := os.Getenv("ALLOWED_DOMAINS"); v != "" { + if err := json.Unmarshal([]byte(v), &allowedDomains); err != nil { + log.Fatal("failed to read ALLOWED_DOMAINS from environment", zap.Error(err)) + } + } + + if len(allowedDomains) < 1 { + log.Fatal("no allowed domains") + } + + cm, err := localtls.NewCertManager(os.Getenv("CERTIFICATE_NAME"), os.Getenv("CERTIFICATE_NAMESPACE")) + if err != nil { + log.Fatal("failed to create certificate manager", zap.Error(err)) + } + + go func() { + if err := cm.Watch(ctx, log); err != nil { + log.Error("certificate manager exited", zap.Error(err)) + + cancel() + } + }() + + be := &server.Backend{ + AllowedDomains: allowedDomains, + Log: log, + LMTPAddress: os.Getenv("LMTP_ADDRESS"), + RootContext: ctx, + RSpam: milter.NewDefaultClient("tcp", "rspamd"), + OverallLimiter: rate.NewLimiter(rate.Limit(10), 20), + } + + s := smtp.NewServer(be) + defer s.Close() //nolint:errcheck + + s.Addr = ":2525" + s.Domain = "cycore.io" + s.WriteTimeout = 10 * time.Second + s.WriteTimeout = 10 * time.Second + s.MaxMessageBytes = 300 * 1024 * 1024 // 300 MiB + s.MaxRecipients = 10 + s.TLSConfig = &tls.Config{ + GetCertificate: cm.Get, + } + + log.Fatal("server exited", zap.Error(s.ListenAndServeTLS())) } diff --git a/flake.lock b/flake.lock index b74b6e1..26e94b0 100644 --- a/flake.lock +++ b/flake.lock @@ -5,11 +5,11 @@ "systems": "systems" }, "locked": { - "lastModified": 1681202837, - "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=", + "lastModified": 1694529238, + "narHash": "sha256-zsNZZGTGnMOf9YpHKJqMSsa0dXbfmxeoJ7xHlrt+xmY=", "owner": "numtide", "repo": "flake-utils", - "rev": "cfacdce06f30d2b68473a46042957675eebb3401", + "rev": "ff7b65b44d01cf9ba6a71320833626af21126384", "type": "github" }, "original": { @@ -20,16 +20,16 @@ }, "nixpkgs": { "locked": { - "lastModified": 1683627095, - "narHash": "sha256-8u9SejRpL2TrMuHBdhYh4FKc1OGPDLyWTpIbNTtoHsA=", + "lastModified": 1695825837, + "narHash": "sha256-4Ne11kNRnQsmSJCRSSNkFRSnHC4Y5gPDBIQGjjPfJiU=", "owner": "nixos", "repo": "nixpkgs", - "rev": "a08e061a4ee8329747d54ddf1566d34c55c895eb", + "rev": "5cfafa12d57374f48bcc36fda3274ada276cf69e", "type": "github" }, "original": { "owner": "nixos", - "ref": "nixos-22.11", + "ref": "nixos-23.05", "repo": "nixpkgs", "type": "github" } diff --git a/flake.nix b/flake.nix index 166e5da..4dc4007 100644 --- a/flake.nix +++ b/flake.nix @@ -1,7 +1,7 @@ { description = "tkcli devshell"; inputs = { - nixpkgs.url = "github:nixos/nixpkgs/nixos-22.11"; + nixpkgs.url = "github:nixos/nixpkgs/nixos-23.05"; #nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable"; # localstack is broken right now (2023-01-25) in unstable, due to a missing dependency flake-utils.url = "github:numtide/flake-utils"; }; diff --git a/go.mod b/go.mod index 5d2cd6f..0abd058 100644 --- a/go.mod +++ b/go.mod @@ -3,15 +3,58 @@ module git.cycore.io/cycore/mail go 1.20 require ( - github.com/emersion/go-imap v1.2.1 // indirect - github.com/emersion/go-message v0.16.0 // indirect - github.com/emersion/go-milter v0.3.3 // indirect + github.com/emersion/go-message v0.16.0 + github.com/emersion/go-milter v0.3.3 + github.com/emersion/go-smtp v0.16.0 + github.com/pkg/errors v0.9.1 + github.com/stretchr/readcaster v0.0.0-20140428013627-9c14a60f85dc + go.uber.org/zap v1.24.0 + golang.org/x/time v0.3.0 + k8s.io/api v0.28.2 + k8s.io/client-go v0.28.2 +) + +require ( + github.com/davecgh/go-spew v1.1.1 // indirect github.com/emersion/go-sasl v0.0.0-20200509203442-7bfe0ed36a21 // indirect - github.com/emersion/go-smtp v0.16.0 // indirect github.com/emersion/go-textwrapper v0.0.0-20200911093747-65d896831594 // indirect + github.com/emicklei/go-restful/v3 v3.9.0 // indirect + github.com/go-logr/logr v1.2.4 // indirect + github.com/go-openapi/jsonpointer v0.19.6 // indirect + github.com/go-openapi/jsonreference v0.20.2 // indirect + github.com/go-openapi/swag v0.22.3 // indirect + github.com/gogo/protobuf v1.3.2 // indirect + github.com/golang/protobuf v1.5.3 // indirect + github.com/google/gnostic-models v0.6.8 // indirect + github.com/google/go-cmp v0.5.9 // indirect + github.com/google/gofuzz v1.2.0 // indirect + github.com/google/uuid v1.3.0 // indirect + github.com/imdario/mergo v0.3.6 // indirect + github.com/josharian/intern v1.0.0 // indirect + github.com/json-iterator/go v1.1.12 // indirect + github.com/mailru/easyjson v0.7.7 // indirect + github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd // indirect + github.com/modern-go/reflect2 v1.0.2 // indirect + github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect + github.com/spf13/pflag v1.0.5 // indirect go.uber.org/atomic v1.7.0 // indirect go.uber.org/multierr v1.6.0 // indirect - go.uber.org/zap v1.24.0 // indirect - golang.org/x/text v0.3.7 // indirect - golang.org/x/time v0.3.0 // indirect + golang.org/x/net v0.15.0 // indirect + golang.org/x/oauth2 v0.8.0 // indirect + golang.org/x/sys v0.12.0 // indirect + golang.org/x/term v0.12.0 // indirect + golang.org/x/text v0.13.0 // indirect + golang.org/x/tools v0.13.0 // indirect + google.golang.org/appengine v1.6.7 // indirect + google.golang.org/protobuf v1.30.0 // indirect + gopkg.in/inf.v0 v0.9.1 // indirect + gopkg.in/yaml.v2 v2.4.0 // indirect + gopkg.in/yaml.v3 v3.0.1 // indirect + k8s.io/apimachinery v0.28.2 // indirect + k8s.io/klog/v2 v2.100.1 // indirect + k8s.io/kube-openapi v0.0.0-20230717233707-2695361300d9 // indirect + k8s.io/utils v0.0.0-20230406110748-d93618cff8a2 // indirect + sigs.k8s.io/json v0.0.0-20221116044647-bc3834ca7abd // indirect + sigs.k8s.io/structured-merge-diff/v4 v4.2.3 // indirect + sigs.k8s.io/yaml v1.3.0 // indirect ) diff --git a/go.sum b/go.sum index 3b079f3..e457537 100644 --- a/go.sum +++ b/go.sum @@ -1,10 +1,9 @@ +github.com/benbjohnson/clock v1.1.0 h1:Q92kusRqC1XV2MjkWETPvjJVqKetz1OzxZB7mHJLju8= +github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E= github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= +github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= -github.com/emersion/go-imap v1.2.1 h1:+s9ZjMEjOB8NzZMVTM3cCenz2JrQIGGo5j1df19WjTA= -github.com/emersion/go-imap v1.2.1/go.mod h1:Qlx1FSx2FTxjnjWpIlVNEuX+ylerZQNFE5NsmKFSejY= github.com/emersion/go-message v0.11.2/go.mod h1:C4jnca5HOTo4bGN9YdqNQM9sITuT3Y0K6bSUw9RklvY= -github.com/emersion/go-message v0.15.0 h1:urgKGqt2JAc9NFJcgncQcohHdiYb803YTH9OQwHBHIY= -github.com/emersion/go-message v0.15.0/go.mod h1:wQUEfE+38+7EW8p8aZ96ptg6bAb1iwdgej19uXASlE4= github.com/emersion/go-message v0.16.0 h1:uZLz8ClLv3V5fSFF/fFdW9jXjrZkXIpE1Fn8fKx7pO4= github.com/emersion/go-message v0.16.0/go.mod h1:pDJDgf/xeUIF+eicT6B/hPX/ZbEorKkUMPOxrPVG2eQ= github.com/emersion/go-milter v0.3.3 h1:DiP9Xmw2FqEuosNCd01XPDBb1K3OziNmt7BG2ddFlgs= @@ -16,20 +15,161 @@ github.com/emersion/go-smtp v0.16.0/go.mod h1:qm27SGYgoIPRot6ubfQ/GpiPy/g3PaZAVR github.com/emersion/go-textwrapper v0.0.0-20160606182133-d0e65e56babe/go.mod h1:aqO8z8wPrjkscevZJFVE1wXJrLpC5LtJG7fqLOsPb2U= github.com/emersion/go-textwrapper v0.0.0-20200911093747-65d896831594 h1:IbFBtwoTQyw0fIM5xv1HF+Y+3ZijDR839WMulgxCcUY= github.com/emersion/go-textwrapper v0.0.0-20200911093747-65d896831594/go.mod h1:aqO8z8wPrjkscevZJFVE1wXJrLpC5LtJG7fqLOsPb2U= +github.com/emicklei/go-restful/v3 v3.9.0 h1:XwGDlfxEnQZzuopoqxwSEllNcCOM9DhhFyhFIIGKwxE= +github.com/emicklei/go-restful/v3 v3.9.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc= +github.com/go-logr/logr 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"k8s.io/client-go/kubernetes" + "k8s.io/client-go/tools/cache" + "k8s.io/client-go/tools/clientcmd" +) + +type CertManager struct { + cert *tls.Certificate + + informer v1.SecretInformer + + Log *zap.Logger + + secretName string + secretNamespace string +} + +func NewCertManager(name, namespace string) (*CertManager, error) { + if name == "" || namespace == "" { + return nil, errors.New("name and namespace are required") + } + + cm := &CertManager{ + secretName: name, + secretNamespace: namespace, + } + + kc, err := getKubernetesClient() + if err != nil { + return nil, errors.Wrap(err, "failed to get kubernetes client") + } + + informerFactory := informers.NewSharedInformerFactory(kc, 10*time.Minute) + + cm.informer = informerFactory.Core().V1().Secrets() + + if _, err = cm.informer.Informer().AddEventHandler(cache.ResourceEventHandlerFuncs{ + AddFunc: cm.addSecretHandler, + UpdateFunc: cm.updateSecretHandler, + DeleteFunc: cm.deleteSecretHandler, + }); err != nil { + return nil, errors.Wrap(err, "failed to register event handlers with informer") + } + + return cm, nil +} + +func (cm *CertManager) Get(_ *tls.ClientHelloInfo) (*tls.Certificate, error) { + if cm.cert == nil { + return nil, errors.New("no certificate") + } + + return cm.cert, nil +} + +func (cm *CertManager) Watch(ctx context.Context, log *zap.Logger) error { + cm.Log = log + + if cm.informer == nil { + return errors.New("no informer in CertManager") + } + + cm.informer.Informer().Run(ctx.Done()) + + return errors.New("watcher exited") +} + +func (cm *CertManager) addSecretHandler(obj any) { + secret, ok := obj.(corev1.Secret) + if !ok { + return + } + + if secret.Namespace != cm.secretNamespace || + secret.Name != cm.secretName { + return + } + + cert, err := CertFromSecret(&secret) + if err != nil { + cm.Log.Error("failed to parse secret as TLS certificate", zap.Error(err)) + + return + } + + cm.cert = &cert + +} + +func (cm *CertManager) updateSecretHandler(oldObj, newObj any) { + oldCertSecret, ok := oldObj.(corev1.Secret) + if !ok { + return + } + + if oldCertSecret.Namespace != cm.secretNamespace || + oldCertSecret.Name != cm.secretName { + return + } + + newCertSecret, ok := newObj.(corev1.Secret) + if !ok { + return + } + + if newCertSecret.Name != oldCertSecret.Name { + cm.secretName = newCertSecret.Name + } + + newCertificate, err := CertFromSecret(&newCertSecret) + if err != nil { + cm.Log.Error("failed to parse secret as a TLS certificate", zap.Error(err)) + } + + cm.cert = &newCertificate +} + +func (cm *CertManager) deleteSecretHandler(obj any) { + secret, ok := obj.(corev1.Secret) + if !ok { + return + } + + if secret.Namespace != cm.secretNamespace || + secret.Name != cm.secretName { + return + } + + cm.cert = nil +} + +func getKubernetesClient() (*kubernetes.Clientset, error) { + kubeConfig, err := clientcmd.BuildConfigFromFlags("", "") + if err != nil { + return nil, errors.Wrap(err, "failed to generate Kubernetes config") + } + + return kubernetes.NewForConfig(kubeConfig) +} + +func CertFromSecret(secret *corev1.Secret) (cert tls.Certificate, err error) { + var pubCert, key []byte + + if _, err := base64.StdEncoding.Decode(pubCert, secret.Data["tls.crt"]); err != nil { + return cert, errors.Wrap(err, "failed to decode public certificate") + } + + if _, err := base64.StdEncoding.Decode(key, secret.Data["tls.key"]); err != nil { + return cert, errors.Wrap(err, "failed to decode private key") + } + + return tls.X509KeyPair(pubCert, key) +} diff --git a/server/server.go b/server/server.go index 09b7675..d606d65 100644 --- a/server/server.go +++ b/server/server.go @@ -1,21 +1,28 @@ package server import ( + "bytes" "context" + "errors" "fmt" "io" + "net" "strings" + "sync" "time" "github.com/emersion/go-message/mail" "github.com/emersion/go-milter" "github.com/emersion/go-smtp" + "github.com/stretchr/readcaster" "go.uber.org/zap" "golang.org/x/time/rate" ) const ConnectionTimeout = 3 * time.Minute +const defaultLMTPTimeout = 30 * time.Second + // ErrRateLimit indicates that the message is rejected due to a rate limit. var ErrRateLimit = &smtp.SMTPError{ Code: 450, @@ -34,6 +41,8 @@ var ErrBadGateway = &smtp.SMTPError{ type Backend struct { AllowedDomains []string + LMTPAddress string + Log *zap.Logger RootContext context.Context @@ -69,16 +78,24 @@ type Session struct { b *Backend conn *smtp.Conn rspam *milter.ClientSession + + to []string + from string } // Discard currently processed message. func (session *Session) Reset() { - panic("not implemented") // TODO: Implement } // Free all resources associated with session. func (session *Session) Logout() error { - panic("not implemented") // TODO: Implement + if session.rspam != nil { + if err := session.rspam.Close(); err != nil { + session.b.Log.Error("failed to close rspam session", zap.Error(err)) + } + } + + return nil } // Authenticate the user using SASL PLAIN. @@ -93,7 +110,13 @@ func (session *Session) Mail(from string, opts *smtp.MailOptions) error { return fmt.Errorf("filter failure: %w", err) } - return parseAction(action) + if err := parseAction(action); err != nil { + return err + } + + session.from = from + + return nil } // Add recipient for currently processed message. @@ -111,20 +134,89 @@ func (session *Session) Rcpt(to string) error { return fmt.Errorf("filter failure: %w", err) } - return parseAction(action) + if err := parseAction(action); err != nil { + return err + } + + session.to = append(session.to, to) + + return nil } // Set currently processed message contents and send it. // // r must be consumed before Data returns. func (session *Session) Data(r io.Reader) error { - // TODO: handle the modifyAction below, whatever it is. - _, action, err := session.rspam.BodyReadFrom(r) + log := session.b.Log.With( + zap.String("from", session.from), + zap.Strings("to", session.to), + ) + + caster := readcaster.New(r) + + wg := new(sync.WaitGroup) + + msg := new(bytes.Buffer) + + wg.Add(1) + go func() { + defer wg.Done() + + n, err := msg.ReadFrom(caster.NewReader()) + if err != nil { + log.Error("failed to read message data into message", zap.Error(err)) + + return + } + + if n == 0 { + log.Warn("received empty message") + } + }() + + _, action, err := session.rspam.BodyReadFrom(caster.NewReader()) if err != nil { return fmt.Errorf("filter failure: %w", err) } - return parseAction(action) + if err := parseAction(action); err != nil { + return err + } + + log.Debug("message accepted for delivery") + + // ensure the message has been received to msg + wg.Wait() + + // Forward to LMTP destination + conn, err := net.DialTimeout("tcp", session.b.LMTPAddress, defaultLMTPTimeout) + if err != nil { + log.Error("failed to dial LMTP server", + zap.String("lmtp", session.b.LMTPAddress), + zap.Error(err), + ) + + return errors.New("failed to forward message") + } + + host, _, _ := net.SplitHostPort(session.b.LMTPAddress) + + lc, err := smtp.NewClientLMTP(conn, host) + if err != nil { + log.Error("failed to construct LMTP client", zap.Error(err)) + + return errors.New("failed to forward message") + } + + if err := lc.SendMail(session.from, session.to, msg); err != nil { + session.b.Log.Error("failed to forward message to LMTP server", zap.Error(err)) + + return err + } + + session.b.Log.Debug("message forwarded to LMTP server") + + return nil } func (session *Session) validateDomain(to string) error { @@ -139,7 +231,7 @@ func (session *Session) validateDomain(to string) error { } for _, d := range session.b.AllowedDomains { - if strings.Contains(pieces[2], d) { + if pieces[2] == d { return nil } }