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# Byte-compiled / optimized / DLL files
__pycache__/
*.py[cod]
*$py.class
# Certs, db, private test files
*.crt
*.key
*.db
test.txt
# C extensions
*.so
# Distribution / packaging
.Python
build/
develop-eggs/
dist/
downloads/
eggs/
.eggs/
lib/
lib64/
parts/
sdist/
var/
wheels/
share/python-wheels/
*.egg-info/
.installed.cfg
*.egg
MANIFEST
# PyInstaller
# Usually these files are written by a python script from a template
# before PyInstaller builds the exe, so as to inject date/other infos into it.
*.manifest
*.spec
# Installer logs
pip-log.txt
pip-delete-this-directory.txt
# Unit test / coverage reports
htmlcov/
.tox/
.nox/
.coverage
.coverage.*
.cache
nosetests.xml
coverage.xml
*.cover
*.py,cover
.hypothesis/
.pytest_cache/
cover/
# Translations
*.mo
*.pot
# Django stuff:
*.log
local_settings.py
db.sqlite3
db.sqlite3-journal
# Flask stuff:
instance/
.webassets-cache
# Scrapy stuff:
.scrapy
# Sphinx documentation
docs/_build/
# PyBuilder
.pybuilder/
target/
# Jupyter Notebook
.ipynb_checkpoints
# IPython
profile_default/
ipython_config.py
# pyenv
# For a library or package, you might want to ignore these files since the code is
# intended to run in multiple environments; otherwise, check them in:
# .python-version
# pipenv
# According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
# However, in case of collaboration, if having platform-specific dependencies or dependencies
# having no cross-platform support, pipenv may install dependencies that don't work, or not
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#Pipfile.lock
# UV
# Similar to Pipfile.lock, it is generally recommended to include uv.lock in version control.
# This is especially recommended for binary packages to ensure reproducibility, and is more
# commonly ignored for libraries.
#uv.lock
# poetry
# Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
# This is especially recommended for binary packages to ensure reproducibility, and is more
# commonly ignored for libraries.
# https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
#poetry.lock
# pdm
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#pdm.lock
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# in version control.
# https://pdm.fming.dev/latest/usage/project/#working-with-version-control
.pdm.toml
.pdm-python
.pdm-build/
# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
__pypackages__/
# Celery stuff
celerybeat-schedule
celerybeat.pid
# SageMath parsed files
*.sage.py
# Environments
.env
.venv
env/
venv/
ENV/
env.bak/
venv.bak/
# Spyder project settings
.spyderproject
.spyproject
# Rope project settings
.ropeproject
# mkdocs documentation
/site
# mypy
.mypy_cache/
.dmypy.json
dmypy.json
# Pyre type checker
.pyre/
# pytype static type analyzer
.pytype/
# Cython debug symbols
cython_debug/
# PyCharm
# JetBrains specific template is maintained in a separate JetBrains.gitignore that can
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#.idea/
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.pypirc

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GNU AFFERO GENERAL PUBLIC LICENSE
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versions of the GNU Affero General Public License can be used, that proxy's
public statement of acceptance of a version permanently authorizes you
to choose that version for the Program.
Later license versions may give you additional or different
permissions. However, no additional obligations are imposed on any
author or copyright holder as a result of your choosing to follow a
later version.
15. Disclaimer of Warranty.
THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
16. Limitation of Liability.
IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
SUCH DAMAGES.
17. Interpretation of Sections 15 and 16.
If the disclaimer of warranty and limitation of liability provided
above cannot be given local legal effect according to their terms,
reviewing courts shall apply local law that most closely approximates
an absolute waiver of all civil liability in connection with the
Program, unless a warranty or assumption of liability accompanies a
copy of the Program in return for a fee.
END OF TERMS AND CONDITIONS
How to Apply These Terms to Your New Programs
If you develop a new program, and you want it to be of the greatest
possible use to the public, the best way to achieve this is to make it
free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If your software can interact with users remotely through a computer
network, you should also make sure that it provides a way for users to
get its source. For example, if your program is a web application, its
interface could display a "Source" link that leads users to an archive
of the code. There are many ways you could offer source, and different
solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

7
README.md Normal file
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# PyMTA-server
PyMTA
## License
This project is licensed under the GNU Affero General Public License v3.0 (AGPL-3.0).
See the [LICENSE](./LICENSE) file for more information.

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"""
Authentication modules for the SMTP server.
"""
import logging
from datetime import datetime
from aiosmtpd.smtp import AuthResult, LoginPassword
from models import Session, User, Domain, WhitelistedIP, AuthLog, check_password
logger = logging.getLogger(__name__)
class Authenticator:
"""Username/password authenticator."""
def __call__(self, server, session, envelope, mechanism, auth_data):
if not isinstance(auth_data, LoginPassword):
logger.warning(f'Invalid auth data format: {type(auth_data)}')
return AuthResult(success=False, handled=True, message='535 Authentication failed')
# Decode bytes to string if necessary
username = auth_data.login
password = auth_data.password
if isinstance(username, bytes):
username = username.decode('utf-8')
if isinstance(password, bytes):
password = password.decode('utf-8')
session_db = Session()
try:
peer_ip = session.peer[0]
logger.debug(f'Authentication attempt: {username} from {peer_ip}')
# Look up user in database
user = session_db.query(User).filter_by(email=username).first()
if user and check_password(password, user.password_hash):
domain = session_db.query(Domain).filter_by(id=user.domain_id).first()
auth_log = AuthLog(
timestamp=datetime.now(),
peer=str(session.peer),
username=username,
success=True,
message=f'Successful login for {username}'
)
session_db.add(auth_log)
session_db.commit()
logger.info(f'Authenticated user: {username} from domain {domain.domain_name if domain else "unknown"}')
# Don't include the SMTP response code in the message - let aiosmtpd handle it
return AuthResult(success=True, handled=True)
else:
auth_log = AuthLog(
timestamp=datetime.now(),
peer=str(session.peer),
username=username,
success=False,
message=f'Failed login for {username}: invalid credentials'
)
session_db.add(auth_log)
session_db.commit()
logger.warning(f'Authentication failed for {username}: invalid credentials')
return AuthResult(success=False, handled=True, message='535 Authentication failed')
except Exception as e:
session_db.rollback()
logger.error(f'Authentication error: {e}')
return AuthResult(success=False, handled=True, message='451 Internal server error')
finally:
session_db.close()
class IPAuthenticator:
"""IP-based authenticator for clients that don't provide credentials."""
def __call__(self, server, session, envelope, mechanism, auth_data):
session_db = Session()
try:
peer_ip = session.peer[0]
logger.debug(f'IP-based authentication attempt from: {peer_ip}')
# Check if IP is whitelisted
whitelist = session_db.query(WhitelistedIP).filter_by(ip_address=peer_ip).first()
if whitelist:
domain = session_db.query(Domain).filter_by(id=whitelist.domain_id).first()
if domain:
auth_log = AuthLog(
timestamp=datetime.now(),
peer=str(session.peer),
username=None,
success=True,
message=f'Authenticated via whitelisted IP for domain {domain.domain_name}'
)
session_db.add(auth_log)
session_db.commit()
logger.info(f'Authenticated via whitelist: IP {peer_ip} for {domain.domain_name}')
return AuthResult(success=True, handled=True, message='Authenticated via whitelist')
return AuthResult(success=False, handled=True, message='IP not whitelisted')
except Exception as e:
session_db.rollback()
logger.error(f'IP Authentication error: {e}')
return AuthResult(success=False, handled=True, message='Server error')
finally:
session_db.close()

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"""
Command-line tools for managing the SMTP server.
"""
import argparse
import sys
from models import Session, Domain, User, WhitelistedIP, hash_password, create_tables
from dkim_manager import DKIMManager
import logging
logging.basicConfig(level=logging.INFO)
logger = logging.getLogger(__name__)
def add_domain(domain_name, requires_auth=True):
"""Add a new domain to the database."""
session = Session()
try:
existing = session.query(Domain).filter_by(domain_name=domain_name).first()
if existing:
print(f"Domain {domain_name} already exists")
return False
domain = Domain(domain_name=domain_name, requires_auth=requires_auth)
session.add(domain)
session.commit()
print(f"Added domain: {domain_name}")
return True
except Exception as e:
session.rollback()
print(f"Error adding domain: {e}")
return False
finally:
session.close()
def add_user(email, password, domain_name):
"""Add a new user to the database."""
session = Session()
try:
domain = session.query(Domain).filter_by(domain_name=domain_name).first()
if not domain:
print(f"Domain {domain_name} not found")
return False
existing = session.query(User).filter_by(email=email).first()
if existing:
print(f"User {email} already exists")
return False
user = User(
email=email,
password_hash=hash_password(password),
domain_id=domain.id
)
session.add(user)
session.commit()
print(f"Added user: {email}")
return True
except Exception as e:
session.rollback()
print(f"Error adding user: {e}")
return False
finally:
session.close()
def add_whitelisted_ip(ip_address, domain_name):
"""Add an IP to the whitelist for a domain."""
session = Session()
try:
domain = session.query(Domain).filter_by(domain_name=domain_name).first()
if not domain:
print(f"Domain {domain_name} not found")
return False
existing = session.query(WhitelistedIP).filter_by(ip_address=ip_address).first()
if existing:
print(f"IP {ip_address} already whitelisted")
return False
whitelist = WhitelistedIP(
ip_address=ip_address,
domain_id=domain.id
)
session.add(whitelist)
session.commit()
print(f"Added whitelisted IP: {ip_address} for domain {domain_name}")
return True
except Exception as e:
session.rollback()
print(f"Error adding whitelisted IP: {e}")
return False
finally:
session.close()
def generate_dkim_key(domain_name):
"""Generate DKIM key for a domain."""
dkim_manager = DKIMManager()
if dkim_manager.generate_dkim_keypair(domain_name):
print(f"Generated DKIM key for domain: {domain_name}")
# Show DNS record
dns_record = dkim_manager.get_dkim_public_key_record(domain_name)
if dns_record:
print("\nAdd this DNS TXT record:")
print(f"Name: {dns_record['name']}")
print(f"Value: {dns_record['value']}")
return True
else:
print(f"Failed to generate DKIM key for domain: {domain_name}")
return False
def list_dkim_keys():
"""List all DKIM keys."""
dkim_manager = DKIMManager()
keys = dkim_manager.list_dkim_keys()
if not keys:
print("No DKIM keys found")
return
print("DKIM Keys:")
print("-" * 60)
for key in keys:
status = "ACTIVE" if key['active'] else "INACTIVE"
print(f"Domain: {key['domain']}")
print(f"Selector: {key['selector']}")
print(f"Status: {status}")
print(f"Created: {key['created_at']}")
print("-" * 60)
def show_dns_records():
"""Show DNS records for all domains."""
dkim_manager = DKIMManager()
session = Session()
try:
domains = session.query(Domain).all()
if not domains:
print("No domains found")
return
print("DNS Records for DKIM:")
print("=" * 80)
for domain in domains:
dns_record = dkim_manager.get_dkim_public_key_record(domain.domain_name)
if dns_record:
print(f"\nDomain: {domain.domain_name}")
print(f"Record Name: {dns_record['name']}")
print(f"Record Type: {dns_record['type']}")
print(f"Record Value: {dns_record['value']}")
print("-" * 80)
finally:
session.close()
def main():
"""Main CLI function."""
parser = argparse.ArgumentParser(description="SMTP Server Management Tool")
subparsers = parser.add_subparsers(dest='command', help='Available commands')
# Initialize command
init_parser = subparsers.add_parser('init', help='Initialize database')
# Domain commands
domain_parser = subparsers.add_parser('add-domain', help='Add a domain')
domain_parser.add_argument('domain', help='Domain name')
domain_parser.add_argument('--no-auth', action='store_true', help='Domain does not require authentication')
# User commands
user_parser = subparsers.add_parser('add-user', help='Add a user')
user_parser.add_argument('email', help='User email')
user_parser.add_argument('password', help='User password')
user_parser.add_argument('domain', help='Domain name')
# IP whitelist commands
ip_parser = subparsers.add_parser('add-ip', help='Add whitelisted IP')
ip_parser.add_argument('ip', help='IP address')
ip_parser.add_argument('domain', help='Domain name')
# DKIM commands
dkim_parser = subparsers.add_parser('generate-dkim', help='Generate DKIM key for domain')
dkim_parser.add_argument('domain', help='Domain name')
list_dkim_parser = subparsers.add_parser('list-dkim', help='List DKIM keys')
dns_parser = subparsers.add_parser('show-dns', help='Show DNS records for DKIM')
args = parser.parse_args()
if not args.command:
parser.print_help()
return
if args.command == 'init':
create_tables()
print("Database tables created successfully")
elif args.command == 'add-domain':
add_domain(args.domain, not args.no_auth)
elif args.command == 'add-user':
add_user(args.email, args.password, args.domain)
elif args.command == 'add-ip':
add_whitelisted_ip(args.ip, args.domain)
elif args.command == 'generate-dkim':
generate_dkim_key(args.domain)
elif args.command == 'list-dkim':
list_dkim_keys()
elif args.command == 'show-dns':
show_dns_records()
if __name__ == '__main__':
main()

25
config.py Normal file
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"""
Configuration settings for the SMTP server.
"""
# Server settings
SMTP_PORT = 4025
SMTP_TLS_PORT = 40587
HOSTNAME = 'localhost'
# Database settings
DATABASE_URL = 'sqlite:///smtp_server.db'
# Logging settings
LOG_LEVEL = 'INFO'
# Email relay settings
RELAY_TIMEOUT = 10
# TLS settings
TLS_CERT_FILE = 'server.crt'
TLS_KEY_FILE = 'server.key'
# DKIM settings
DKIM_SELECTOR = 'default'
DKIM_KEY_SIZE = 2048

212
dkim_manager.py Normal file
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"""
DKIM key management and email signing functionality.
"""
import logging
import dkim
from cryptography.hazmat.primitives import serialization, hashes
from cryptography.hazmat.primitives.asymmetric import rsa
from datetime import datetime
from models import Session, Domain, DKIMKey
from config import DKIM_SELECTOR, DKIM_KEY_SIZE
logger = logging.getLogger(__name__)
class DKIMManager:
"""Manages DKIM keys and email signing."""
def __init__(self):
self.selector = DKIM_SELECTOR
def generate_dkim_keypair(self, domain_name):
"""Generate DKIM key pair for a domain."""
session = Session()
try:
# Check if domain exists
domain = session.query(Domain).filter_by(domain_name=domain_name).first()
if not domain:
logger.error(f"Domain {domain_name} not found")
return False
# Check if DKIM key already exists
existing_key = session.query(DKIMKey).filter_by(domain_id=domain.id, is_active=True).first()
if existing_key:
logger.info(f"DKIM key already exists for domain {domain_name}")
return True
# Generate RSA key pair
private_key = rsa.generate_private_key(
public_exponent=65537,
key_size=DKIM_KEY_SIZE
)
# Get private key in PEM format
private_pem = private_key.private_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PrivateFormat.PKCS8,
encryption_algorithm=serialization.NoEncryption()
).decode('utf-8')
# Get public key in PEM format
public_key = private_key.public_key()
public_pem = public_key.public_bytes(
encoding=serialization.Encoding.PEM,
format=serialization.PublicFormat.SubjectPublicKeyInfo
).decode('utf-8')
# Store in database
dkim_key = DKIMKey(
domain_id=domain.id,
selector=self.selector,
private_key=private_pem,
public_key=public_pem,
created_at=datetime.now(),
is_active=True
)
session.add(dkim_key)
session.commit()
logger.info(f"Generated DKIM key for domain: {domain_name}")
return True
except Exception as e:
session.rollback()
logger.error(f"Error generating DKIM key for {domain_name}: {e}")
return False
finally:
session.close()
def get_dkim_private_key(self, domain_name):
"""Get DKIM private key for a domain."""
session = Session()
try:
domain = session.query(Domain).filter_by(domain_name=domain_name).first()
if not domain:
return None
dkim_key = session.query(DKIMKey).filter_by(
domain_id=domain.id,
is_active=True
).first()
if dkim_key:
return dkim_key.private_key
return None
except Exception as e:
logger.error(f"Error getting DKIM private key for {domain_name}: {e}")
return None
finally:
session.close()
def get_dkim_public_key_record(self, domain_name):
"""Get DKIM public key DNS record for a domain."""
session = Session()
try:
domain = session.query(Domain).filter_by(domain_name=domain_name).first()
if not domain:
return None
dkim_key = session.query(DKIMKey).filter_by(
domain_id=domain.id,
is_active=True
).first()
if dkim_key:
# Extract public key from PEM format for DNS record
public_key_lines = dkim_key.public_key.strip().split('\n')
public_key_data = ''.join(public_key_lines[1:-1]) # Remove header/footer
return {
'name': f'{self.selector}._domainkey.{domain_name}',
'type': 'TXT',
'value': f'v=DKIM1; k=rsa; p={public_key_data}'
}
return None
except Exception as e:
logger.error(f"Error getting DKIM public key record for {domain_name}: {e}")
return None
finally:
session.close()
def sign_email(self, email_content, domain_name):
"""Sign email content with DKIM."""
try:
private_key = self.get_dkim_private_key(domain_name)
if not private_key:
logger.warning(f"No DKIM key found for domain: {domain_name}")
return email_content
# Convert content to bytes if it's a string
if isinstance(email_content, str):
email_bytes = email_content.encode('utf-8')
else:
email_bytes = email_content
# Sign the email
signature = dkim.sign(
email_bytes,
self.selector.encode('utf-8'),
domain_name.encode('utf-8'),
private_key.encode('utf-8'),
include_headers=[b'from', b'to', b'subject', b'date', b'message-id']
)
# Combine signature with original content
signed_content = signature + email_bytes
logger.info(f"Successfully signed email for domain: {domain_name}")
# Return as string if input was string
if isinstance(email_content, str):
return signed_content.decode('utf-8')
else:
return signed_content
except Exception as e:
logger.error(f"Error signing email for domain {domain_name}: {e}")
return email_content
def list_dkim_keys(self):
"""List all DKIM keys."""
session = Session()
try:
keys = session.query(DKIMKey, Domain).join(Domain).all()
result = []
for dkim_key, domain in keys:
result.append({
'domain': domain.domain_name,
'selector': dkim_key.selector,
'created_at': dkim_key.created_at,
'active': dkim_key.is_active
})
return result
except Exception as e:
logger.error(f"Error listing DKIM keys: {e}")
return []
finally:
session.close()
def initialize_default_keys(self):
"""Initialize DKIM keys for existing domains that don't have them."""
session = Session()
try:
domains = session.query(Domain).all()
for domain in domains:
existing_key = session.query(DKIMKey).filter_by(
domain_id=domain.id,
is_active=True
).first()
if not existing_key:
logger.info(f"Generating DKIM key for existing domain: {domain.domain_name}")
self.generate_dkim_keypair(domain.domain_name)
except Exception as e:
logger.error(f"Error initializing default DKIM keys: {e}")
finally:
session.close()

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email_relay.py Normal file
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"""
Email relay functionality for the SMTP server.
"""
import dns.resolver
import smtplib
import logging
from datetime import datetime
from models import Session, EmailLog
logger = logging.getLogger(__name__)
class EmailRelay:
"""Handles relaying emails to recipient mail servers."""
def __init__(self):
self.timeout = 10
def relay_email(self, mail_from, rcpt_tos, content):
"""Relay email to recipient's mail server."""
try:
for rcpt in rcpt_tos:
domain = rcpt.split('@')[1]
try:
mx_records = dns.resolver.resolve(domain, 'MX')
mx_host = mx_records[0].exchange.to_text().rstrip('.')
except Exception as e:
logger.error(f'Failed to resolve MX for {domain}: {e}')
return False
try:
with smtplib.SMTP(mx_host, 25, timeout=self.timeout) as relay_server:
relay_server.set_debuglevel(1)
relay_server.sendmail(mail_from, rcpt, content)
logger.info(f'Relayed email to {rcpt} via {mx_host}')
except Exception as e:
logger.error(f'Failed to relay email to {rcpt}: {e}')
return False
return True
except Exception as e:
logger.error(f'General relay error: {e}')
return False
def log_email(self, message_id, peer, mail_from, rcpt_tos, content, status, dkim_signed=False):
"""Log email activity to database."""
session_db = Session()
try:
# Convert content to string if it's bytes
if isinstance(content, bytes):
content_str = content.decode('utf-8', errors='replace')
else:
content_str = content
email_log = EmailLog(
message_id=message_id,
timestamp=datetime.now(),
peer=str(peer),
mail_from=mail_from,
rcpt_tos=', '.join(rcpt_tos),
content=content_str,
status=status,
dkim_signed=dkim_signed
)
session_db.add(email_log)
session_db.commit()
logger.debug(f'Logged email: {message_id}')
except Exception as e:
session_db.rollback()
logger.error(f'Error logging email: {e}')
finally:
session_db.close()

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"""
Modular SMTP Server with DKIM support.
Main server file that ties all modules together.
"""
import asyncio
import logging
import sys
import os
# Import our modules
from config import SMTP_PORT, SMTP_TLS_PORT, HOSTNAME, LOG_LEVEL
from models import create_tables
from smtp_handler import CustomSMTPHandler, PlainController
from tls_utils import generate_self_signed_cert, create_ssl_context
from dkim_manager import DKIMManager
from aiosmtpd.controller import Controller
from aiosmtpd.smtp import SMTP as AIOSMTP
# Configure logging
logging.basicConfig(
level=getattr(logging, LOG_LEVEL),
format='%(asctime)s - %(name)s - %(levelname)s - %(message)s'
)
logger = logging.getLogger(__name__)
# Enable asyncio debugging
try:
loop = asyncio.get_running_loop()
loop.set_debug(True)
except RuntimeError:
# No running loop, set debug when we create one
pass
async def main():
"""Main server function."""
logger.info("Starting SMTP Server with DKIM support...")
# Initialize database
logger.info("Initializing database...")
create_tables()
# Initialize DKIM manager and generate keys for domains without them
logger.info("Initializing DKIM manager...")
dkim_manager = DKIMManager()
dkim_manager.initialize_default_keys()
# Add test data if needed
from models import Session, Domain, User, WhitelistedIP, hash_password
session = Session()
try:
# Add example.com domain if not exists
domain = session.query(Domain).filter_by(domain_name='example.com').first()
if not domain:
domain = Domain(domain_name='example.com', requires_auth=True)
session.add(domain)
session.commit()
logger.info("Added example.com domain")
# Add test user if not exists
user = session.query(User).filter_by(email='test@example.com').first()
if not user:
user = User(
email='test@example.com',
password_hash=hash_password('testpass123'),
domain_id=domain.id
)
session.add(user)
session.commit()
logger.info("Added test user: test@example.com")
# Add whitelisted IP if not exists
whitelist = session.query(WhitelistedIP).filter_by(ip_address='127.0.0.1').first()
if not whitelist:
whitelist = WhitelistedIP(ip_address='127.0.0.1', domain_id=domain.id)
session.add(whitelist)
session.commit()
logger.info("Added whitelisted IP: 127.0.0.1")
except Exception as e:
session.rollback()
logger.error(f"Error adding test data: {e}")
finally:
session.close()
# Generate SSL certificate if it doesn't exist
logger.info("Checking SSL certificates...")
if not generate_self_signed_cert():
logger.error("Failed to generate SSL certificate")
return
# Create SSL context
ssl_context = create_ssl_context()
if not ssl_context:
logger.error("Failed to create SSL context")
return
# Start plain SMTP server (with IP whitelist fallback)
handler_plain = CustomSMTPHandler()
controller_plain = PlainController(
handler_plain,
hostname=HOSTNAME,
port=SMTP_PORT
)
controller_plain.start()
logger.info(f'Starting plain SMTP server on {HOSTNAME}:{SMTP_PORT}...')
# Start TLS SMTP server using closure pattern like the original
handler_tls = CustomSMTPHandler()
# Define TLS controller class with ssl_context in closure (like original)
class TLSController(Controller):
def factory(self):
return AIOSMTP(
self.handler,
tls_context=ssl_context, # Use ssl_context from closure
require_starttls=False, # Don't force STARTTLS, but make it available
auth_require_tls=True, # If auth is used, require TLS
authenticator=self.handler.combined_authenticator,
decode_data=True,
hostname=self.hostname
)
controller_tls = TLSController(
handler_tls,
hostname=HOSTNAME,
port=SMTP_TLS_PORT
)
controller_tls.start()
logger.info(f'Starting STARTTLS SMTP server on {HOSTNAME}:{SMTP_TLS_PORT}...')
logger.info('Both SMTP servers are running:')
logger.info(f' - Plain SMTP (IP whitelist): {HOSTNAME}:{SMTP_PORT}')
logger.info(f' - STARTTLS SMTP (auth required): {HOSTNAME}:{SMTP_TLS_PORT}')
logger.info(' - DKIM signing enabled for configured domains')
logger.info('')
logger.info('Management commands:')
logger.info(' python cli_tools.py --help')
logger.info('')
logger.info('Press Ctrl+C to stop the servers...')
try:
await asyncio.Event().wait()
except KeyboardInterrupt:
logger.info('Shutting down SMTP servers...')
controller_plain.stop()
controller_tls.stop()
logger.info('SMTP servers stopped.')
if __name__ == '__main__':
try:
asyncio.run(main())
except KeyboardInterrupt:
logger.info('Server interrupted by user')
sys.exit(0)
except Exception as e:
logger.error(f'Server error: {e}')
sys.exit(1)

76
models.py Normal file
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"""
Database models for the SMTP server.
"""
from sqlalchemy import create_engine, Column, Integer, String, DateTime, Text, Boolean
from sqlalchemy.orm import declarative_base, sessionmaker
from datetime import datetime
import bcrypt
from config import DATABASE_URL
# SQLAlchemy setup
Base = declarative_base()
engine = create_engine(DATABASE_URL, echo=False)
Session = sessionmaker(bind=engine)
class Domain(Base):
__tablename__ = 'domains'
id = Column(Integer, primary_key=True)
domain_name = Column(String, unique=True, nullable=False)
requires_auth = Column(Boolean, default=True)
class User(Base):
__tablename__ = 'users'
id = Column(Integer, primary_key=True)
email = Column(String, unique=True, nullable=False)
password_hash = Column(String, nullable=False)
domain_id = Column(Integer, nullable=False)
class WhitelistedIP(Base):
__tablename__ = 'whitelisted_ips'
id = Column(Integer, primary_key=True)
ip_address = Column(String, unique=True, nullable=False)
domain_id = Column(Integer, nullable=False)
class EmailLog(Base):
__tablename__ = 'email_logs'
id = Column(Integer, primary_key=True)
message_id = Column(String, unique=True, nullable=False)
timestamp = Column(DateTime, nullable=False)
peer = Column(String, nullable=False)
mail_from = Column(String, nullable=False)
rcpt_tos = Column(String, nullable=False)
content = Column(Text, nullable=False)
status = Column(String, nullable=False)
dkim_signed = Column(Boolean, default=False)
class AuthLog(Base):
__tablename__ = 'auth_logs'
id = Column(Integer, primary_key=True)
timestamp = Column(DateTime, nullable=False)
peer = Column(String, nullable=False)
username = Column(String)
success = Column(Boolean, nullable=False)
message = Column(String, nullable=False)
class DKIMKey(Base):
__tablename__ = 'dkim_keys'
id = Column(Integer, primary_key=True)
domain_id = Column(Integer, nullable=False)
selector = Column(String, nullable=False)
private_key = Column(Text, nullable=False)
public_key = Column(Text, nullable=False)
created_at = Column(DateTime, default=datetime.now)
is_active = Column(Boolean, default=True)
def create_tables():
"""Create all database tables."""
Base.metadata.create_all(engine)
def hash_password(password):
"""Hash a password using bcrypt."""
return bcrypt.hashpw(password.encode('utf-8'), bcrypt.gensalt()).decode('utf-8')
def check_password(password, hashed):
"""Check a password against its hash."""
return bcrypt.checkpw(password.encode('utf-8'), hashed.encode('utf-8'))

8
requirements.txt Normal file
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# SMTP MTA server:
aiosmtpd
sqlalchemy
pyOpenSSL
bcrypt
dnspython
dkimpy
cryptography

144
smtp_handler.py Normal file
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"""
SMTP handler for processing incoming emails.
"""
import logging
import uuid
from datetime import datetime
from aiosmtpd.smtp import SMTP as AIOSMTP, AuthResult
from aiosmtpd.controller import Controller
from auth import Authenticator, IPAuthenticator
from email_relay import EmailRelay
from dkim_manager import DKIMManager
logger = logging.getLogger(__name__)
class CombinedAuthenticator:
"""Combined authenticator that tries username/password first, then falls back to IP whitelist."""
def __init__(self):
self.user_auth = Authenticator()
self.ip_auth = IPAuthenticator()
def __call__(self, server, session, envelope, mechanism, auth_data):
from aiosmtpd.smtp import LoginPassword
# If auth_data is provided (username/password), try user authentication first
if auth_data and isinstance(auth_data, LoginPassword):
result = self.user_auth(server, session, envelope, mechanism, auth_data)
if result.success:
return result
# If user auth fails, don't try IP auth - return the failure
return result
# If no auth_data provided, try IP-based authentication
return self.ip_auth(server, session, envelope, mechanism, auth_data)
class CustomSMTPHandler:
"""Custom SMTP handler for processing emails."""
def __init__(self):
self.authenticator = Authenticator()
self.ip_authenticator = IPAuthenticator()
self.combined_authenticator = CombinedAuthenticator()
self.email_relay = EmailRelay()
self.dkim_manager = DKIMManager()
self.auth_require_tls = False
self.auth_methods = ['LOGIN', 'PLAIN']
async def handle_DATA(self, server, session, envelope):
"""Handle incoming email data."""
try:
message_id = str(uuid.uuid4())
logger.info(f'Received email {message_id} from {envelope.mail_from} to {envelope.rcpt_tos}')
# Convert content to string if it's bytes
if isinstance(envelope.content, bytes):
content = envelope.content.decode('utf-8', errors='replace')
else:
content = envelope.content
# Extract domain from sender for DKIM signing
sender_domain = envelope.mail_from.split('@')[1] if '@' in envelope.mail_from else None
# Sign with DKIM if domain is configured
signed_content = content
dkim_signed = False
if sender_domain:
signed_content = self.dkim_manager.sign_email(content, sender_domain)
# Check if signing was successful (content changed)
dkim_signed = signed_content != content
if dkim_signed:
logger.info(f'Email {message_id} signed with DKIM for domain {sender_domain}')
# Relay the email
success = self.email_relay.relay_email(
envelope.mail_from,
envelope.rcpt_tos,
signed_content
)
# Log the email
status = 'relayed' if success else 'failed'
self.email_relay.log_email(
message_id=message_id,
peer=session.peer,
mail_from=envelope.mail_from,
rcpt_tos=envelope.rcpt_tos,
content=content, # Log original content, not signed
status=status,
dkim_signed=dkim_signed
)
if success:
logger.info(f'Email {message_id} successfully relayed')
return '250 Message accepted for delivery'
else:
logger.error(f'Email {message_id} failed to relay')
return '550 Message relay failed'
except Exception as e:
logger.error(f'Error handling email: {e}')
return '550 Internal server error'
async def handle_RCPT(self, server, session, envelope, address, rcpt_options):
"""Handle RCPT TO command - validate recipients."""
logger.debug(f'RCPT TO: {address}')
envelope.rcpt_tos.append(address)
return '250 OK'
async def handle_MAIL(self, server, session, envelope, address, mail_options):
"""Handle MAIL FROM command - validate sender."""
logger.debug(f'MAIL FROM: {address}')
envelope.mail_from = address
return '250 OK'
class TLSController(Controller):
"""Custom controller with TLS support - modeled after the working original."""
def __init__(self, handler, ssl_context, hostname='localhost', port=40587):
self.ssl_context = ssl_context
super().__init__(handler, hostname=hostname, port=port)
def factory(self):
return AIOSMTP(
self.handler,
tls_context=self.ssl_context,
require_starttls=False, # Don't force STARTTLS, but make it available
auth_require_tls=True, # If auth is used, require TLS
authenticator=self.handler.combined_authenticator,
decode_data=True,
hostname=self.hostname
)
class PlainController(Controller):
"""Controller for plain SMTP with username/password and IP-based authentication."""
def factory(self):
return AIOSMTP(
self.handler,
authenticator=self.handler.combined_authenticator,
auth_require_tls=False, # Allow AUTH over plain text (not recommended for production)
decode_data=True,
hostname=self.hostname
)

85
tests/send_email.py Normal file
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import smtplib
from email.mime.text import MIMEText
import ssl
import argparse
parser = argparse.ArgumentParser()
parser.add_argument('--port', type=int, default=4025)
parser.add_argument('--porttls', type=int, default=40587)
parser.add_argument('--recipient', type=str, default="test@target-email.com")
args = parser.parse_args()
recipient = args.recipient
username='test@example.com'
password='testpass123'
def send_test_email(port=args.port, smtpserver='localhost', use_auth=False,
username=None, password=None, subject='SMTP Authentication Test',
recipient=args.recipient):
"""Send a test email using plain SMTP."""
msg = MIMEText('This is a test email.')
msg['Subject'] = subject
msg['From'] = username
msg['To'] = recipient
try:
with smtplib.SMTP(smtpserver, port, timeout=5) as server:
if use_auth:
server.login(username, password)
server.send_message(msg)
print(f'Email sent {subject}!')
except Exception as e:
print(f'Error sending email: {e}')
def send_test_email_tls(port=args.porttls, smtpserver='localhost', use_auth=False,
username=None, password=None, subject='StarTTLS Email Test',
recipient=args.recipient):
"""Send a test email using STARTTLS."""
msg = MIMEText('This is a test email over TLS.')
msg['Subject'] = subject
msg['From'] = username
msg['To'] = recipient
context = ssl._create_unverified_context()
server = None
try:
server = smtplib.SMTP(smtpserver, port, timeout=5)
#server.set_debuglevel(2)
server.ehlo()
if server.has_extn('STARTTLS'):
server.starttls(context=context)
server.ehlo()
else:
print("Server does not support STARTTLS")
return
if use_auth:
server.login(username, password)
server.send_message(msg)
print(f'Email sent {subject}!')
else:
server.send_message(msg)
print(f'Email sent {subject}!')
except Exception as e:
print(f"Error sending TLS email: {e}")
finally:
if server:
try:
server.quit()
except:
pass
if __name__ == '__main__':
# SMTP Authenticated test:
send_test_email(port=args.port, use_auth=True, username=username, password=password, recipient=recipient, subject='SMTP Authenticated Email Test')
# SMTP IP Whitelisted test:
send_test_email(port=args.port, username=username, recipient=recipient, subject='SMTP IP Whitelisted Test')
# SMTP Bad Credentials test:
send_test_email(port=args.port, use_auth=True, username='usser@example.com', password='badpasssw', recipient=recipient, subject='SMTP Bad Credentials')
# TLS IP Whitelisted test:
send_test_email_tls(port=args.porttls, username=username, recipient=recipient, subject='StarTTLS IP Whitelisted Test')
# TLS Authenticated test:
send_test_email_tls(port=args.porttls, use_auth=True, username=username, password=password, recipient=recipient, subject='StarTTLS Authenticated Email Test')
# TLS Bad Credentials test:
send_test_email_tls(port=args.porttls, use_auth=True, username='usser@example.com', password='badpasssw', recipient=recipient,subject='StarTTLS Bad Credentials Test')

53
tests/test_debug_db.py Normal file
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"""
Debug script to test database operations.
"""
import sys
import os
import sqlite3
# Add current directory to path
sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
print("Testing database operations...")
# Test direct SQLite connection
try:
conn = sqlite3.connect('smtp_server.db')
cursor = conn.cursor()
# Check tables
cursor.execute("SELECT name FROM sqlite_master WHERE type='table';")
tables = cursor.fetchall()
print(f"Tables in database: {[table[0] for table in tables]}")
# Check domains
cursor.execute("SELECT * FROM domains;")
domains = cursor.fetchall()
print(f"Domains: {domains}")
conn.close()
print("Direct SQLite test successful")
except Exception as e:
print(f"Direct SQLite test failed: {e}")
# Test SQLAlchemy models
try:
from models import Session, Domain, User, WhitelistedIP, create_tables
print("Models imported successfully")
# Create session
session = Session()
# Check domains
domains = session.query(Domain).all()
print(f"SQLAlchemy domains: {[(d.id, d.domain_name) for d in domains]}")
session.close()
print("SQLAlchemy test successful")
except Exception as e:
print(f"SQLAlchemy test failed: {e}")
import traceback
traceback.print_exc()

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tls_utils.py Normal file
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"""
TLS utilities for the SMTP server.
"""
import ssl
import os
import logging
from OpenSSL import crypto
from config import TLS_CERT_FILE, TLS_KEY_FILE
logger = logging.getLogger(__name__)
def generate_self_signed_cert():
"""Generate self-signed SSL certificate if it doesn't exist."""
if os.path.exists(TLS_CERT_FILE) and os.path.exists(TLS_KEY_FILE):
logger.info("SSL certificate already exists")
return True
try:
logger.info("Generating self-signed SSL certificate...")
# Generate private key
k = crypto.PKey()
k.generate_key(crypto.TYPE_RSA, 2048)
# Generate certificate
cert = crypto.X509()
cert.get_subject().CN = 'localhost'
cert.set_serial_number(1000)
cert.gmtime_adj_notBefore(0)
cert.gmtime_adj_notAfter(365 * 24 * 60 * 60) # Valid for 1 year
cert.set_issuer(cert.get_subject())
cert.set_pubkey(k)
cert.sign(k, 'sha256')
# Write certificate
with open(TLS_CERT_FILE, 'wb') as f:
f.write(crypto.dump_certificate(crypto.FILETYPE_PEM, cert))
# Write private key
with open(TLS_KEY_FILE, 'wb') as f:
f.write(crypto.dump_privatekey(crypto.FILETYPE_PEM, k))
logger.info(f"SSL certificate generated: {TLS_CERT_FILE}, {TLS_KEY_FILE}")
return True
except Exception as e:
logger.error(f"Failed to generate SSL certificate: {e}")
return False
def create_ssl_context():
"""Create SSL context for TLS support."""
try:
ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
ssl_context.load_cert_chain(certfile=TLS_CERT_FILE, keyfile=TLS_KEY_FILE)
ssl_context.set_ciphers('DEFAULT') # Relax ciphers for compatibility
logger.info('SSL context created successfully')
return ssl_context
except Exception as e:
logger.error(f'Failed to create SSL context: {e}')
return None