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11 Commits

Author SHA1 Message Date
Uriel Fanelli 223b65994c Better TLS Configuration 2023-06-18 19:19:55 +02:00
Uriel Fanelli 1af4d062fd Logging MAIL
LOGGING MAIL for STARTTLS
2023-06-18 19:07:35 +02:00
Uriel Fanelli e7bdc4e92b Little better logging
Little better logging
2023-06-18 18:46:52 +02:00
Uriel Fanelli 386c80b6a4 Add Dockerfile
#Start multistage Docker
#Stage 1 : build brutalinks


FROM golang:latest AS zangbuilder
RUN apt install make  git -y
RUN mkdir -p /go/src/zangtumb
RUN git clone https://git.keinpfusch.net/loweel/zangtumb.git /go/src/zangtumb 
WORKDIR /go/src/zangtumb
ENV GO111MODULE=auto 
RUN go build 


#Start multistage Docker
#Stage 3 : put pieces together

FROM debian:latest 
RUN apt update
RUN apt upgrade -y
RUN apt install ca-certificates -y
RUN mkdir -p /opt/zangtumb
WORKDIR  /opt/zangtumb
COPY --from=zangbuilder /go/src/zangtumb /opt/zangtumb/
ENTRYPOINT ["/opt/zangtumb/zangtumb"]
2023-06-18 18:00:22 +02:00
LowEel 885df1c4ab improved tls selfsigned 2021-07-31 18:07:38 +02:00
LowEel 90b8ece611 creating certs in the proper time 2021-07-31 15:00:12 +02:00
LowEel 6fb3d402e5 Updated readme. 2021-07-31 14:02:25 +02:00
LowEel ddf9566fd9 README updated 2021-07-31 13:31:30 +02:00
LowEel ef4187459e Now Zangtumb will create its own selfsigned certificates 2021-07-31 13:26:20 +02:00
LowEel 71a9b231e3 Protected map, better check for RCPT 2021-07-30 23:20:49 +02:00
Uriel Fanelli c101731bcd Update 'LICENSE' 2021-02-02 19:09:02 +00:00
12 changed files with 659 additions and 37 deletions

24
Dockerfile Normal file
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@ -0,0 +1,24 @@
#Start multistage Docker
#Stage 1 : build brutalinks
FROM golang:latest AS zangbuilder
RUN apt install make git -y
RUN mkdir -p /go/src/zangtumb
RUN git clone https://git.keinpfusch.net/loweel/zangtumb.git /go/src/zangtumb
WORKDIR /go/src/zangtumb
ENV GO111MODULE=auto
RUN go build
#Start multistage Docker
#Stage 2 : put pieces together
FROM debian:latest
RUN apt update
RUN apt upgrade -y
RUN apt install ca-certificates -y
RUN mkdir -p /opt/zangtumb
WORKDIR /opt/zangtumb
COPY --from=zangbuilder /go/src/zangtumb /opt/zangtumb/
ENTRYPOINT ["/opt/zangtumb/zangtumb"]

295
LICENSE
View File

@ -1,14 +1,289 @@
Copyright (C) 2020 loweel@keinpfusch.net
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
EUROPEAN UNION PUBLIC LICENCE v. 1.2
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This program is distributed in the hope that it will be useful,
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This European Union Public Licence (the EUPL) applies to the Work (as defined
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use is covered by a right of the copyright holder of the Work).
You should have received a copy of the GNU General Public License
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The Work is provided under the terms of this Licence when the Licensor (as
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- this Licence shall be governed by the law of the European Union Member State
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- this licence shall be governed by Belgian law if the Licensor has no seat,
residence or registered office inside a European Union Member State.
Appendix
Compatible Licences according to Article 5 EUPL are:
- GNU General Public License (GPL) v. 2, v. 3
- GNU Affero General Public License (AGPL) v. 3
- Open Software License (OSL) v. 2.1, v. 3.0
- Eclipse Public License (EPL) v. 1.0
- CeCILL v. 2.0, v. 2.1
- Mozilla Public Licence (MPL) v. 2
- GNU Lesser General Public Licence (LGPL) v. 2.1, v. 3
- Creative Commons Attribution-ShareAlike v. 3.0 Unported (CC BY-SA 3.0) for
works other than software
- European Union Public Licence (EUPL) v. 1.1, v. 1.2
- Québec Free and Open-Source Licence — Reciprocity (LiLiQ-R) or Strong
Reciprocity (LiLiQ-R+).
The European Commission may update this Appendix to later versions of the above
licences without producing a new version of the EUPL, as long as they provide
the rights granted in Article 2 of this Licence and protect the covered Source
Code from exclusive appropriation.
All other changes or additions to this Appendix require the production of a new
EUPL version.

View File

@ -71,20 +71,22 @@ everything is configured using ENV strings , as follows
| ---------- | --------------------- | ------------------------------------------------------------ |
| KEYFILE | "/certs/mydomain.key" | Path for private key. Only needed when using TLS. Which means, well... it's your email. So you don't want to send it in clear, isn't it? |
| CERTFILE | "/certs/mydomain.crt" | Path for certificate. Only needed when using TLS. Which means, well... it's your email. So you don't want to send it in clear, isn't it? |
| DOMAINNAME | "mydomain.tld" | will declare this value on the banner. No impact on recipients. |
| DOMAINNAME | "mydomain.tld" | will declare this value on the banner. No impact on recipients. Used as CN in self-signed certificates |
| LISTEN | ":5025" | Address to listen in golang format. This example will listen to port 5025 on all interfaces. You may specify a specific interface like "1.2.3.4:5025" |
| RECIPIENTS | "recipients.conf" | File containing a list with email to serve. One mail address per line. Please notice, that pippo@pluto.com and pippo@paperino.com will end in the same mailbox, "pippo". |
| MAILFOLDER | "/zangmail" | Root of mailfolder. Mail is stored in the default dovecot Maildir format, meaning in the example "/zangmail/%u/Maildir" . |
| USETLS | "true" | Whether to force all to use TLS or not. yes. Do it. |
Of course , if you put your certificatesinto /certs, (likethe example), this folder MUST exist.
That's it.
# FAQ
- _This TLS behavior is violating RFC 2487_
- To give a shit of RFCs is a de facto standard. It works, and no spammer will ever buy a certificate per each spambot.
- To give a shit of RFCs is a *de facto standard*. Zangtumb works, and no spammer will ever buy a certificate per each spambot.

View File

@ -5,6 +5,7 @@ import (
"log"
"os"
"strings"
"sync"
)
// The Backend implements SMTP server methods.
@ -17,6 +18,8 @@ type Backend struct {
var SmtpBackend *Backend
var mutex = &sync.Mutex{}
// Load Valid Recipients
func (bkd *Backend) LoadValidRecipients() error {
bkd.MaxRecipients = 0
@ -41,9 +44,13 @@ func (bkd *Backend) LoadValidRecipients() error {
}
// Checks if Mail is a valid recipient
// Checks if Mail is a valid local recipient
func (bkd *Backend) CheckValidRcpt(to string) bool {
defer mutex.Unlock()
mutex.Lock()
_, isValid := bkd.ValidRecipientsMap[to]
return isValid

5
go.mod
View File

@ -2,7 +2,4 @@ module zangtumb
go 1.13
require (
github.com/amalfra/maildir v0.0.7
github.com/emersion/go-smtp v0.12.1 // indirect
)
require github.com/amalfra/maildir v0.0.7

4
go.sum
View File

@ -1,6 +1,2 @@
github.com/amalfra/maildir v0.0.7 h1:quK6vVGmjqP1zbeo9g7jtx37htGoYrKKlSpcDcplD04=
github.com/amalfra/maildir v0.0.7/go.mod h1:+ynYowCpUHTWebUhg3Sb6Jp2dq+SUSWLTSLIf7Vy+ak=
github.com/emersion/go-sasl v0.0.0-20190817083125-240c8404624e h1:ba7YsgX5OV8FjGi5ZWml8Jng6oBrJAb3ahqWMJ5Ce8Q=
github.com/emersion/go-sasl v0.0.0-20190817083125-240c8404624e/go.mod h1:G/dpzLu16WtQpBfQ/z3LYiYJn3ZhKSGWn83fyoyQe/k=
github.com/emersion/go-smtp v0.12.1 h1:1R8BDqrR2HhlGwgFYcOi+BVTvK1bMjAB65QcVpJ5sNA=
github.com/emersion/go-smtp v0.12.1/go.mod h1:SD9V/xa4ndMw77lR3Mf7htkp8RBNYuPh9UeuBs9tpUQ=

View File

@ -4,8 +4,12 @@ import (
"bytes"
"log"
"net"
"time"
)
func mailHandler(origin net.Addr, from string, to []string, data []byte) {
SmtpSession := new(Session)
@ -20,7 +24,7 @@ func mailHandler(origin net.Addr, from string, to []string, data []byte) {
if dataErr := SmtpSession.Data(bytes.NewReader(data)); dataErr != nil {
log.Println("Problem Saving Message: ", dataErr.Error())
}
log.Println("Session is: ", SmtpSession)
} else {
log.Println(rcptErr)
}
@ -28,3 +32,20 @@ func mailHandler(origin net.Addr, from string, to []string, data []byte) {
}
}
func handlerRcpt(remoteAddr net.Addr, from string, to string) bool {
log.Println("CHECK #2 Rcpt to:", to)
if !SmtpBackend.CheckValidRcpt(to) {
log.Printf("%s [ %s -> %s ] %s BAD!!!!", "YU NO MAIL!!! WE NU RELAY!!! ", from, to, remoteAddr.String() )
time.Sleep(10 * time.Second)
return false
}else{
log.Printf("%s [ %s -> %s ] %s GOOD!!!!", "WE DO!!!", from, to, remoteAddr.String() )
}
return true
}

4
run.sh
View File

@ -8,11 +8,11 @@ export LISTEN=":1025"
##SESSION
export RECIPIENTS="./recipients.conf"
export RECIPIENTS="./recipients.conf.example"
export MAILFOLDER="mail"
##MAIN
export USETLS="false"
export USETLS="true"
##RUN

View File

@ -1,13 +1,13 @@
package main
import (
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"strings"
"time"
"github.com/amalfra/maildir"
)
@ -22,11 +22,7 @@ type Session struct {
}
func (s *Session) Rcpt(to string) error {
log.Println("Rcpt to:", to)
if !SmtpBackend.CheckValidRcpt(to) {
time.Sleep(10 * time.Second)
return errors.New("YU NO MAIL!!! WE NU RELAY")
}
log.Println("CHECK #1 Rcpt to:", to)
s.RcptTo = to
if strings.Contains(to, "@") {
rcptArray := strings.Split(to, "@")

View File

@ -41,9 +41,10 @@ type AuthHandler func(remoteAddr net.Addr, mechanism string, username []byte, pa
// ListenAndServe listens on the TCP network address addr
// and then calls Serve with handler to handle requests
// on incoming connections.
func ListenAndServe(addr string, handler Handler, appname string, hostname string, instance *Server) error {
func ListenAndServe(addr string, handler Handler, rcpthandler HandlerRcpt, appname string, hostname string, instance *Server) error {
srv := instance
srv.Addr = addr
srv.HandlerRcpt = rcpthandler
srv.Handler = handler
srv.Appname = appname
srv.Hostname = hostname
@ -258,6 +259,11 @@ loop:
to = nil
buffer.Reset()
case "MAIL":
log.Println("TlsConfigExists: " , s.srv.TLSConfig != nil)
log.Println("TLS_Required: " , s.srv.TLSRequired)
log.Println("We Are in Clear: ", !s.tls)
if s.srv.TLSConfig != nil && s.srv.TLSRequired && !s.tls {
s.writef("530 5.7.0 Must issue a STARTTLS command first")
break

289
tls.go Normal file
View File

@ -0,0 +1,289 @@
package main
import (
"crypto/ecdsa"
"crypto/ed25519"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"log"
"math/big"
"net"
"os"
"strings"
"time"
)
func publicKey(priv interface{}) interface{} {
switch k := priv.(type) {
case *rsa.PrivateKey:
return &k.PublicKey
case *ecdsa.PrivateKey:
return &k.PublicKey
case ed25519.PrivateKey:
return k.Public().(ed25519.PublicKey)
default:
return nil
}
}
func ZMakecert() {
host := ZangSmtpServer.Hostname
validFrom := ""
validFor := time.Duration(3650 * 24 * time.Hour)
isCA := true
rsaBits := 4096
ecdsaCurve := "P256"
ed25519Key := true
var priv interface{}
var err error
switch ecdsaCurve {
case "":
if ed25519Key {
_, priv, err = ed25519.GenerateKey(rand.Reader)
} else {
priv, err = rsa.GenerateKey(rand.Reader, rsaBits)
}
case "P224":
priv, err = ecdsa.GenerateKey(elliptic.P224(), rand.Reader)
case "P256":
priv, err = ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
case "P384":
priv, err = ecdsa.GenerateKey(elliptic.P384(), rand.Reader)
case "P521":
priv, err = ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
default:
log.Fatalf("Unrecognized elliptic curve: %q", ecdsaCurve)
}
if err != nil {
log.Fatalf("Failed to generate private key: %v", err)
}
// ECDSA, ED25519 and RSA subject keys should have the DigitalSignature
// KeyUsage bits set in the x509.Certificate template
keyUsage := x509.KeyUsageDigitalSignature
// Only RSA subject keys should have the KeyEncipherment KeyUsage bits set. In
// the context of TLS this KeyUsage is particular to RSA key exchange and
// authentication.
if _, isRSA := priv.(*rsa.PrivateKey); isRSA {
keyUsage |= x509.KeyUsageKeyEncipherment
}
var notBefore time.Time
if len(validFrom) == 0 {
notBefore = time.Now()
} else {
notBefore, err = time.Parse("Jan 2 15:04:05 2006", validFrom)
if err != nil {
log.Fatalf("Failed to parse creation date: %v", err)
}
}
notAfter := notBefore.Add(validFor)
serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
if err != nil {
log.Fatalf("Failed to generate serial number: %v", err)
}
template := x509.Certificate{
SerialNumber: serialNumber,
Subject: pkix.Name{
Organization: []string{"ZangTumb Internal CA"},
Country: []string{"00"},
Province: []string{"5a622d3c-f218-11eb-9a03-0242ac130003"},
Locality: []string{"8927f2fa-f218-11eb-9a03-0242ac130003"},
StreetAddress: []string{"8927f3ea-f218-11eb-9a03-0242ac130003"},
PostalCode: []string{"666"},
},
NotBefore: notBefore,
NotAfter: notAfter,
KeyUsage: keyUsage,
ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
BasicConstraintsValid: true,
}
hosts := strings.Split(host, ",")
for _, h := range hosts {
if ip := net.ParseIP(h); ip != nil {
template.IPAddresses = append(template.IPAddresses, ip)
} else {
template.DNSNames = append(template.DNSNames, h)
}
}
if isCA {
template.IsCA = true
template.KeyUsage |= x509.KeyUsageCertSign
}
derBytes, err := x509.CreateCertificate(rand.Reader, &template, &template, publicKey(priv), priv)
if err != nil {
log.Fatalf("Failed to create certificate: %v", err)
}
certOut, err := os.Create(CrtFile)
if err != nil {
log.Fatalf("Failed to open cert.pem for writing: %v", err)
}
if err := pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes}); err != nil {
log.Fatalf("Failed to write data to cert.pem: %v", err)
}
if err := certOut.Close(); err != nil {
log.Fatalf("Error closing cert.pem: %v", err)
}
log.Println("Finished creating: ", CrtFile)
keyOut, err := os.OpenFile(KeyFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
if err != nil {
log.Fatalf("Failed to open key.pem for writing: %v", err)
return
}
privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
if err != nil {
log.Fatalf("Unable to marshal private key: %v", err)
}
if err := pem.Encode(keyOut, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
log.Fatalf("Failed to write data to key.pem: %v", err)
}
if err := keyOut.Close(); err != nil {
log.Fatalf("Error closing key.pem: %v", err)
}
log.Println("Finished creating: ", KeyFile)
}

View File

@ -36,11 +36,11 @@ func init() {
}
if os.Getenv("USETLS") == "true" {
ZangSmtpServer.ConfigureTLS(CrtFile, KeyFile)
log.Println("Preparing TLS Keys")
ZMakecert()
ZangSmtpServer.TLSListener = false
ZangSmtpServer.TLSRequired = true
log.Println("Using TLS")
log.Println("Using TLS: ", ZangSmtpServer.TLSRequired)
} else {
@ -49,12 +49,21 @@ func init() {
log.Println("WARNING: NOT Using TLS")
}
log.Println("Ready to start the server.")
}
func main() {
if err := smtpd.ListenAndServe(ListenAddr, mailHandler, AppName, ServerName, ZangSmtpServer); err != nil {
log.Println("Starting the server....")
ZangSmtpServer.ConfigureTLS(CrtFile, KeyFile)
defer log.Println("Shutting down the server")
if err := smtpd.ListenAndServe(ListenAddr, mailHandler, handlerRcpt, AppName, ServerName, ZangSmtpServer); err != nil {
log.Panicln("Ops. Something went wrong: ", err.Error())
}
}