Man page of SMTPSCAN
SMTPSCAN
Section: User Commands (1)
Updated: 20020821
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NAME
smtpscan @VERSION@
SYNOPSIS
smtpscan
[OPTIONS...] hostname(s)
smtpscan [OPTIONS...] -D DOMAINNAME
DESCRIPTION
smtpscan is a remote SMTP server version detector. It can be used to guess which mail software is used on a remote server, that may hide its SMTP banner.
smtpscan works by testing the remote SMTP server reaction, thanks to tests
defined in the tests (/usr/local/share/smtpscan/tests) file. Almost all of those tests consists in weird SMTP request, whose answer is not precisly defined in the corresponding RFCs. Some other times, they check whether the remote SMTP server is simply RFC compliant. After each test, remote server returns a SMTP Error Message. Fingerprints are made of SMTP Error Messages corresponding to the tests.
Due to the fact that server reaction may be modified by its configuration, smtpscan tries to detect the nearest fingerprint if there is no exact match, that is it finds the fingerprint(s) that have the fewer different Error Messages.
Currently, 15 tests are used to guess the remote server version. Some other may be added in the future.
OPTIONS
-h, --help Print help message
-V Print smtpscan current version and exits
-v Verbose mode
-d Debug mode
-f=PATH Fingerprint file location
-t=PATH Test file location
-p=PORT Remote port
-i=TIMEOUT Connection timeout (in seconds)
- -c
-
Connect only once. Some servers don't accept too many consecutive
connections from a host. You may use this option to be able to scan some
servers. smtpscan then uses the SMTP 'RSET' command to be able to restart
negociation. Beware: some SMTP servers don't accept too many RSET either...
- -D
-
Specify a Domain name instead of a server. smtpscan then retrieve the corresponding mail exchanger and scan it
- -n=NUMBER
-
Scan the Nth mail exchanger instead of the first (ordered by preference)
- -a
-
Scan all the Mail Exchangers of the specified domain (see -D switch), that is scan every IP address returned by a MX DNS request (beware of 'virtual IPs' or load balancing...)
EXAMPLES
Here is some smtpscan use examples :
- smtpscan smtp.test.com
-
Scans remote host smtp.test.com to guess its smtp software version
- smtpscan smtp1.test.com smtp2.test.com
-
Scans remote hosts smtp1 et smtp2
- smtpscan -D yahoo.com
-
Scans the yahoo.com first Mail Exchanger (may be different servers while
trying several times, because of DNS CNAME)
- smtpscan -D yahoo.com -n 2
-
Scans the yahoo.com secondary Mail Exchanger
- smtpscan -D yahoo.com -a -c -i 15
-
Scans all the yahoo.com Mail Exchangers found, uses the RSET smtp keyword
so that only one connexion is opened per SMTP server and sets the timeout
at 15 seconds
FILES
@prefix@/smtpscan/fingerprints
- fingerprints file
@prefix@/smtpscan/tests
- tests file
AUTHOR
Julien Bordet (<zejames>) <zejames@greyhats.org>
HOW TO HELP
smtpscan fingerprint file is a growing database : any mail sent to zejames@greyhats.org with fingerprint and SMTP server version would be very appreciated :=)
AVAILABILITY
http://www.greyhats.org/outils/smtpscan/
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- OPTIONS
-
- EXAMPLES
-
- FILES
-
- AUTHOR
-
- HOW TO HELP
-
- AVAILABILITY
-
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Time: 07:34:21 GMT, September 13, 2011