I have a database of IP addresses with all the credentials of certain servers. I need to develop a script to find the nearest server using python. I used geoip library to find the location of the server. But it didn't work.
import geoip2.webservice
# Replace YOUR_USER_ID and YOUR_LICENSE_KEY with your MaxMind account ID and license key
client = geoip2.webservice.Client(YOUR_USER_ID, YOUR_LICENSE_KEY)
# Replace IP_ADDRESS with the IP address of the server you want to look up
response = client.insights(IP_ADDRESS)
# The response object contains information about the location of the server
print(response.country.name)print(response.country.iso_code)
print(response.subdivisions.most_specific.name)
print(response.subdivisions.most_specific.iso_code)
print(response.city.name)print(response.postal.code)
print(response.location.latitude)print(response.location.longitude)
Here is the geoip code that I used. Is there any other way to find the nearest server.
I have a server list:
hosts=['server1','server2','server3','server4']
there are server 4 monitoring tools accessed by api calls. these monitoring env urls basically the same except for each env has unique id which is part of the url. These servers can be on any of the 4 monitoring tools. I need to find out which url these servers belong to.
for example, these are the monitoring tools urls:
production_env="https://example.com/e/envid123"
dev_env="https://example.com/e/envid678"
test_env="https://example.com/e/envid567"
uat_env="https://example.com/e/envid1000"
given the server name, I need to find out which env they belong to.
given a server name, for example "server1",
api url would become https://example.com/e/envid123&serverName="server1", this url will give whether server1 exists in production_env or not. I need to check each env url until I find the given server.
I am trying something like this:
envId=['envid123','envid678','envid567','envid1000']
for server in hosts:
for id in envId:
url="https://example.com/e/"+id+&serverName=server
resp=request.get(url)
Any ideas how could do this the best way?
You need quotes around &serverName= to concatenate them. But it's simpler to use a formatting method, such as f-strings.
To find the desired URL, use resp.json to get the decoded JSON, and check the value of the appropriate dictionary element.
found = False
for server in hosts:
for id in envId:
url = f"https://example.com/e/{id}&serverName={server}"
resp = request.get(url)
if resp.json['totalCount'] > 0:
found = True
print(f"Success at host = {server} id = {id}")
break
if found:
break
else:
print("No server found")
I've enabled sendmail using the --enable_sendmail=yes option as described in the GAE docs and am still not getting any emails (though the emails do appear in the logging messages). Simplified code looks like:
from google.appengine.api import mail
SENDER_EMAIL_ADDRESS = "admin#APPID.appspot.com"
msg = "Test message"
subject = "Test subject"
recipient = "{} <{}>".format('username', 'username#gmail.com')
mail.send_mail(sender=SENDER_EMAIL_ADDRESS,
to=recipient,
subject=subject,
body=msg)
What am I doing wrong?
If you specify a From address it must correspond with your local machine. The sendmail handling function in the Mail Stub that google provides for its development server looks like:
...
try:
child.stdin.write(mime_message.as_string())
child.stdin.close()
...
The problem is that the From address passed to the send_mail method is in mime_message headers. Adding the following line as the first line in the try block removes that header from the mime message. This allows sendmail to use a default From address:
mime_message._headers = [x for x in mime_message._headers if x[0] != 'From']
The file with this function can be found at /path/to/google_cloud_sdk/platform/google_appengine/google/appengine/api/mail_stub.py
I want to write my own small mailserver application in python with aiosmtpd
a) for educational purpose to better understand mailservers
b) to realize my own features
So my question is, what is missing (besides aiosmtpd) for an Mail-Transfer-Agent, that can send and receive emails to/from other full MTAs (gmail.com, yahoo.com ...)?
I'm guessing:
1.) Of course a domain and static ip
2.) Valid certificate for this domain
...should be doable with Lets Encrypt
3.) Encryption
...should be doable with SSL/Context/Starttls... with aiosmtpd itself
4.) Resolving MX DNS entries for outgoing emails!?
...should be doable with python library dnspython
5.) Error handling for SMTP communication errors, error replies from other MTAs, bouncing!?
6.) Queue for handling inbound and pending outbund emails!?
Are there any other "essential" features missing?
Of course i know, there are a lot more "advanced" features for a mailserver like spam checking, malware checking, certificate validation, blacklisting, rules, mailboxes and more...
Thanks for all hints!
EDIT:
Let me clarify what is in my mind:
I want to write a mailserver for a club. Its main purpose will be a mailing-list-server. There will be different lists for different groups of the club.
Lets say my domain is myclub.org then there will be for example youth#myclub.org, trainer#myclub.org and so on.
Only members will be allowed to use this mailserver and only the members will receive emails from this mailserver. No one else will be allowed to send emails to this mailserver nor will receive emails from it. The members email-addresses and their group(s) are stored in a database.
In the future i want to integrate some other useful features, for example:
Auto-reminders
A chatbot, where members can control services and request informations by email
What i don't need:
User Mailboxes
POP/IMAP access
Webinterface
Open relay issue:
I want to reject any [FROM] email address that is not in the members database during SMTP negotiation.
I want to check the sending mailservers for a valid certificate.
The number of emails/member/day will be limited.
I'm not sure, if i really need spam detection for the incoming emails?
Losing emails issue:
I think i will need a "lightweight" retry mechanism. However if an outgoing email can't be delivered after some retries, it will be dropped and only the administrator will be notified, not the sender. The members should not be bothered by email delivery issues. Is there any Python Library that can generate RFC3464 compliant error reply emails?
Reboot issue:
I'm not sure if i really need persistent storage for emails, that are not yet sent? In my use case, all the outgoing emails should be delivered usually within a few seconds (if no delivery problem occurs). Before a (planned) reboot i can check for an empty send queue.
aiosmtpd is an excellent tool for writing custom routing and header rewriting rules for email. However, aiosmtpd is not an MTA, since it does not do message queuing or DSN generation. One popular choice of MTA is postfix, and since postfix can be configured to relay all emails for a domain to another local SMTP server (such as aiosmtpd), a natural choice is to use postfix as the internet-facing frontend and aiosmtpd as the business-logic backend.
Advantages of using postfix as the middle-man instead of letting aiosmtpd face the public internet:
No need to handle DNS MX lookups in aiosmtpd -- just relay through postfix (localhost:25)
No worry about non-compliant SMTP clients in aiosmtpd
No worry about STARTTLS in aiosmtpd -- configure this in postfix instead (simpler and more battle-hardened)
No worry about retrying failed email deliveries and sending delivery status notifications
aiosmtpd can be configured to respond with "transient failure" (SMTP 4xx code) upon programming errors, so no email is lost as long as the programming error is fixed within 4 days
Here's how you might configure postfix to work with a local SMTP server powered by e.g. aiosmtpd.
We're going to run postfix on port 25 and aiosmtpd on port 20381.
To specify that postfix should relay emails for example.com to an SMTP server running on port 20381, add the following to /etc/postfix/main.cf:
transport_maps = hash:/etc/postfix/smtp_transport
relay_domains = example.com
And create /etc/postfix/smtp_transport with the contents:
# Table of special transport method for domains in
# virtual_mailbox_domains. See postmap(5), virtual(5) and
# transport(5).
#
# Remember to run
# postmap /etc/postfix/smtp_transport
# and update relay_domains in main.cf after changing this file!
example.com smtp:127.0.0.1:20381
Run postmap /etc/postfix/smtp_transport after creating that file (and every time you modify it).
On the aiosmtpd side, there are a few things to consider.
The most important is how you handle bounce emails. The short story is that you should set the envelope sender to an email address you control that is dedicated to receiving bounces, e.g. bounce#example.com. When email arrives at this address, it should be stored somewhere so you can process bounces, e.g. by removing member email addresses from your database.
Another important thing to consider is how you tell your members' email providers that you are doing mailing list forwarding. You might want to add the following headers when forwarding emails to GROUP#example.com:
Sender: bounce#example.com
List-Name: GROUP
List-Id: GROUP.example.com
List-Unsubscribe: <mailto:postmaster#example.com?subject=unsubscribe%20GROUP>
List-Help: <mailto:postmaster#example.com?subject=list-help>
List-Subscribe: <mailto:postmaster#example.com?subject=subscribe%20GROUP>
Precedence: bulk
X-Auto-Response-Suppress: OOF
Here, I used postmaster#example.com as the recipient for list unsubscribe requests. This should be an address that forwards to the email administrator (that is, you).
Below is a skeleton (untested) that does the above. It stores bounce emails in a directory named bounces and forwards emails with a valid From:-header (one that appears in MEMBERS) according to the list of groups (in GROUPS).
import os
import email
import email.utils
import mailbox
import smtplib
import aiosmtpd.controller
LISTEN_HOST = '127.0.0.1'
LISTEN_PORT = 20381
DOMAIN = 'example.com'
BOUNCE_ADDRESS = 'bounce'
POSTMASTER = 'postmaster'
BOUNCE_DIRECTORY = os.path.join(
os.path.dirname(__file__), 'bounces')
def get_extra_headers(list_name, is_group=True, skip=()):
list_id = '%s.%s' % (list_name, DOMAIN)
bounce = '%s#%s' % (BOUNCE_ADDRESS, DOMAIN)
postmaster = '%s#%s' % (POSTMASTER, DOMAIN)
unsub = '<mailto:%s?subject=unsubscribe%%20%s>' % (postmaster, list_name)
help = '<mailto:%s?subject=list-help>' % (postmaster,)
sub = '<mailto:%s?subject=subscribe%%20%s>' % (postmaster, list_name)
headers = [
('Sender', bounce),
('List-Name', list_name),
('List-Id', list_id),
('List-Unsubscribe', unsub),
('List-Help', help),
('List-Subscribe', sub),
]
if is_group:
headers.extend([
('Precedence', 'bulk'),
('X-Auto-Response-Suppress', 'OOF'),
])
headers = [(k, v) for k, v in headers if k.lower() not in skip]
return headers
def store_bounce_message(message):
mbox = mailbox.Maildir(BOUNCE_DIRECTORY)
mbox.add(message)
MEMBERS = ['foo#example.net', 'bar#example.org',
'clubadmin#example.org']
GROUPS = {
'group1': ['foo#example.net', 'bar#example.org'],
POSTMASTER: ['clubadmin#example.org'],
}
class ClubHandler:
def validate_sender(self, message):
from_ = message.get('From')
if not from_:
return False
realname, address = email.utils.parseaddr(from_)
if address not in MEMBERS:
return False
return True
def translate_recipient(self, local_part):
try:
return GROUPS[local_part]
except KeyError:
return None
async def handle_RCPT(self, server, session, envelope, address, rcpt_options):
local, domain = address.split('#')
if domain.lower() != DOMAIN:
return '550 wrong domain'
if local.lower() == BOUNCE:
envelope.is_bounce = True
return '250 OK'
translated = self.translate_recipient(local.lower())
if translated is None:
return '550 no such user'
envelope.rcpt_tos.extend(translated)
return '250 OK'
async def handle_DATA(self, server, session, envelope):
if getattr(envelope, 'is_bounce', False):
if len(envelope.rcpt_tos) > 0:
return '500 Cannot send bounce message to multiple recipients'
store_bounce_message(envelope.original_content)
return '250 OK'
message = email.message_from_bytes(envelope.original_content)
if not self.validate_sender(message):
return '500 I do not know you'
for header_key, header_value in get_extra_headers('club'):
message[header_key] = header_value
bounce = '%s#%s' % (BOUNCE_ADDRESS, DOMAIN)
with smtplib.SMTP('localhost', 25) as smtp:
smtp.sendmail(bounce, envelope.rcpt_tos, message.as_bytes())
return '250 OK'
if __name__ == '__main__':
controller = aiosmtpd.controller.Controller(ClubHandler, hostname=LISTEN_HOST, port=LISTEN_PORT)
controller.start()
print("Controller started")
try:
while True:
input()
except (EOFError, KeyboardInterrupt):
controller.stop()
The most important thing about running your own SMTP server is that you must not be an open relay. That means you must not accept messages from strangers and relay them to any destination on the internet, since that would enable spammers to send spam through your SMTP server -- which would quickly get you blocked.
Thus, your server should
relay from authenticated users/senders to remote destinations, or
relay from strangers to your own domains.
Since your question talks about resolving MX records for outgoing email, I'm assuming you want your server to accept emails from authenticated users. Thus you need to consider how your users will authenticate themselves to the server. aiosmtpd currently has an open pull request providing a basic SMTP AUTH implementation; you may use that, or you may implement your own (by subclassing aiosmtpd.smtp.SMTP and implementing the smtp_AUTH() method).
The second-most important thing about running your own SMTP server is that you must not lose emails without notifying the sender. When you accept an email from an authenticated user to be relayed to an external destination, you should let the user know (by sending an RFC 3464 Delivery Status Notification via email) if the message is delayed or if it is not delivered at all.
You should not drop the email immediately if the remote destination fails to receive it; you should try again later and repeatedly try until you deem that you have tried for long enough. Postfix, for instance, waits 10 minutes before trying to deliver the email after the first delivery attempt fails, and then it waits 20 minutes if the second attempt fails, and so on until the message has been attempted delivered for a couple days.
You should also take care to allow the host running your mail server to be rebooted, meaning you should store queued messages on disk. For this you might be able to use the mailbox module.
Of course, I haven't covered every little detail, but I think the above two points are the most important, and you didn't seem to cover them in your question.
You may consider the following features:
Message threading
Support for Delivery status
Support for POP and IMAP protocols
Supports for protocols such as RFC 2821 SMTP and RFC 2033 LMTP email message transport
Support Multiple message tagging
Support for PGP/MIME (RFC2015)
Support list-reply
Lets each user manage their own mail lists Supports
Control of message headers during composition
Support for address groups
Prevention of mailing list loops
Junk mail control
I am writing a piece of code that uses authentication from ldap server. Currently my code only lets the user DN and the pwd to be presented for login.
Username: CN=mynane,CN=Users,DC=example,DC=com
Pwd : XXXX
Now what is want to do is allow the username in the format
Username: myname#example.com
Pwd: xxxx
I can bind to the server using the credentials in the format "myname#example.com", but my code needs the group of the 'myname' as well for authentication. For that I need to find out the DN from "myname#example.com" so that I can extract the group 'myname' belongs to.
So my question is how can I find out the DN from format "myname#example.com"
How is it done?
Thanks
If you want to query dn by email address, you might try the following codes.
ldap = "SELECT distinguishedName From 'LDAP://DC=example,DC=com' WHERE mail = '{}'"
mail = 'myname#example.com'
import win32com.client
c = win32com.client.Dispatch('ADODB.Connection')
c.Open('Provider=ADsDSOObject')
rs,rc = c.Execute(ldap.format(mail))
while not rs.EOF:
for e in rs.fields:
print('{}: {}'.format(e.Name, e.Value))
rs.MoveNext()
you will have to fetch the user whose 'userPrincipalName'='myname#example.com' or 'samAccountName'='myname'
You have to do two things:
Find the right subtree for the DNS domain example.com (usually from the Configuration subtree), if you only have one domain, its easier, simply ignore the part after the #.
Look inside that subtree for the sAMAccountName=myname, as it is unique inside the domain.
Those names often look like UPNs but aren't. In fact they are usually just the sAMAccountName attached to the DNS domain name.