SMTP user enumeration tool with clever timeout, retry and reconnect functionality.
Project description
smtp-user-enum
SMTP user enumeration tool with clever timeout, retry and reconnect functionality.
Some SMTP server take a long time for initial communication (banner and greeting) and then handle subsequent commands quite fast. Then again they randomly start to get slow again.
This implementation of SMTP user enumeration counteracts with granular timeout, retry and reconnect options for initial communication and enumeration separately. The defaults should work fine, however if you encounter slow enumeration, adjust the settings according to your needs.
Installation
pip install smtp-user-enum
Usage
$ smtp-user-enum --help
usage: smtp-user-enum [options] -u/-U host port
smtp-user-enum --help
smtp-user-enum --version
SMTP user enumeration tool with clever timeout, retry and reconnect functionality.
Some SMTP server take a long time for initial communication (banner and greeting) and then
handle subsequent commands quite fast. Then again they randomly start to get slow again.
This implementation of SMTP user enumeration counteracts with granular timeout, retry and
reconnect options for initial communication and enumeration separately.
The defaults should work fine, however if you encounter slow enumeration, adjust the settings
according to your needs.
positional arguments:
host IP or hostname to connect to.
port Port to connect to.
optional arguments:
-h, --help show this help message and exit
-v, --version Show version information,
-m mode, --mode mode Mode to enumerate SMTP users.
Supported modes: VRFY
Default: VRFY
-d, --debug Show debug output. Useful to adjust your timing and retry settings.
-u user, --user user Username to test.
-U file, --file file Newline separated wordlist of users to test.
--timeout-init sec Timeout for initial communication (connect, banner and greeting).
Default: 25
--timeout-enum sec Timeout for user enumeration.
Default: 10
--retry-init int Number of retries for initial communication (connect, banner and greeting).
Default: 4
--retry-enum int Number of retries for user enumeration.
Default: 5
--reconnect int Number of reconnects during user enumeration after retries have exceeded.
Default: 3
Examples
Note: Output is colorized but cannot be displayed via markdown.
Quiet output
$ smtp-user-enum -U /usr/share/wordlists/metasploit/unix_users.txt mail.example.tld 25
Connecting to mail.example.tld 25 ...
220 mail.example.tld ESMTP Sendmail 8.12.8/8.12.8; Wed, 22 Jan 2020 19:33:07 +0200
250 mail.example.tld Hello [10.0.0.1], pleased to meet you
Start enumerating users ...
[----] 501 5.5.2 Argument required
[----] 550 5.1.1 4Dgifts... User unknown
[----] 550 5.1.1 EZsetup... User unknown
[----] 550 5.1.1 OutOfBox... User unknown
[SUCC] 250 2.1.5 root <root@mail.example.tld>
[SUCC] 250 2.1.5 <adm@mail.example.tld>
[----] 550 5.1.1 admin... User unknown
[----] 550 5.1.1 administrator... User unknown
[----] 550 5.1.1 anon... User unknown
[----] 550 5.1.1 auditor... User unknown
[----] 550 5.1.1 avahi... User unknown
[----] 550 5.1.1 avahi-autoipd... User unknown
[----] 550 5.1.1 backup... User unknown
[----] 550 5.1.1 bbs... User unknown
[TEST] bin ...
Verbose output
$ smtp-user-enum -U /usr/share/wordlists/metasploit/unix_users.txt mail.example.tld 25
Connecting to mail.example.tld 25 ...
[1/4] Connecting to mail.example.tld:25 ...
[1/4] Waiting for banner...
[2/4] Waiting for banner...
220 mail.example.tld ESMTP Sendmail 8.12.8/8.12.8; Wed, 22 Jan 2020 19:25:58 +0200
[1/4] Sending greeting...
[1/4] Waiting for greeting...
250 mail.example.tld Hello [10.0.0.1], pleased to meet you
Start enumerating users ...
[Reconn 1/3] [Retry 1/5] Testing: ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 501 5.5.2 Argument required
[Reconn 1/3] [Retry 1/5] Testing: 4Dgifts ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 4Dgifts... User unknown
[Reconn 1/3] [Retry 1/5] Testing: EZsetup ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 EZsetup... User unknown
[Reconn 1/3] [Retry 1/5] Testing: OutOfBox ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 OutOfBox... User unknown
[Reconn 1/3] [Retry 1/5] Testing: ROOT ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[SUCC] 250 2.1.5 root <root@mail.example.tld>
[Reconn 1/3] [Retry 1/5] Testing: adm ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[SUCC] 250 2.1.5 <adm@mail.example.tld>
[Reconn 1/3] [Retry 1/5] Testing: admin ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 admin... User unknown
[Reconn 1/3] [Retry 1/5] Testing: administrator ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 administrator... User unknown
[Reconn 1/3] [Retry 1/5] Testing: anon ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 anon... User unknown
[Reconn 1/3] [Retry 1/5] Testing: auditor ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 auditor... User unknown
[Reconn 1/3] [Retry 1/5] Testing: avahi ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 avahi... User unknown
[Reconn 1/3] [Retry 1/5] Testing: avahi-autoipd ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 avahi-autoipd... User unknown
[Reconn 1/3] [Retry 1/5] Testing: backup ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 backup... User unknown
[Reconn 1/3] [Retry 1/5] Testing: bbs ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[----] 550 5.1.1 bbs... User unknown
[Reconn 1/3] [Retry 1/5] Testing: bin ...
[Reconn 1/3] [Retry 1/5] Waiting for answer...
[Reconn 1/3] [Retry 2/5] Waiting for answer...
[Reconn 1/3] [Retry 3/5] Waiting for answer...
[Reconn 1/3] [Retry 4/5] Waiting for answer...
[Reconn 1/3] [Retry 5/5] Waiting for answer...
[1/4] Connecting to mail.example.tld:25 ...
[1/4] Waiting for banner...
[2/4] Waiting for banner...
220 mail.example.tld ESMTP Sendmail 8.12.8/8.12.8; Wed, 22 Jan 2020 19:27:34 +0200
[1/4] Sending greeting...
[1/4] Waiting for greeting...
250 mail.example.tld Hello [10.0.0.1], pleased to meet you
[Reconn 2/3] [Retry 1/5] Testing: bin ...
[Reconn 2/3] [Retry 1/5] Waiting for answer...
[SUCC] 250 2.1.5 <bin@mail.example.tld>
License
Copyright (c) 2020 cytopia
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