Postfix: Authentikasi SMTP untuk Client

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Sumber: http://postfix.state-of-mind.de/patrick.koetter/smtpauth/smtp_auth_mailclients.html


Siapkan Dovecot

Edit agar dovecot siap digunakan sebagai auth server untuk postfix 

vim /etc/dovecot/conf.d/10-master.conf

Pastikan 

## The listener is added under the service auth section ##
service auth { 
	unix_listener /var/spool/postfix/private/auth {
		mode = 0660
        	user = postfix
        	group = postfix
  	} ##end listener
} ## end service auth

Definisi diatas akan membuka socket /var/spool/postfix/private/auth dengan permission 0660 untuk Postfix. 

vim /etc/dovecot/conf.d/10-auth.conf

auth_mechanisms = plain login

plain authetication mechanism untuk Postfix

restart Dovecot 

service dovecot restart

Preparing Postfix

Masukan parameter SASL ke config file 

vim /etc/postfix/main.cf

#### SASL ####
## specify SASL type ##
smtpd_sasl_type = dovecot

## path to the SASL socket relative to postfix spool directory i.e. /var/spool/postfix ##
smtpd_sasl_path = private/auth

## postfix appends the domain name for SASL logins that do not have the domain part ##
smtpd_sasl_local_domain = example.tst

## SASL default policy ##
smtpd_sasl_security_options = noanonymous

## for legacy application compatibility ##
broken_sasl_auth_clients = yes

## enable SMTP auth ##
smtpd_sasl_auth_enable = yes

## smtp checks ##
## these checks are based on first match, so sequence is important ##
smtpd_recipient_restrictions = permit_mynetworks, permit_sasl_authenticated, reject_unauth_destination



smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
smtpd_sasl_local_domain = $myhostname
broken_sasl_auth_clients = yes
... 
smtpd_recipient_restrictions = 
   permit_sasl_authenticated, 
   permit_mynetworks, 
   check_relay_domains


Masukan SSL/TLS parameter ke config file 

vim /etc/postfix/main.cf

#### SSL/TLS parameters ####

## 'encrypt' will enforce SSL. Not recommended for live servers ##
smtpd_tls_security_level = may 
#smtpd_tls_security_level = encrypt 

smtpd_tls_received_header = yes 
smtpd_tls_auth_only = no 

## loglevel 3 or 4 can be used during troubleshooting ##
smtpd_tls_loglevel = 1 

## path to certificate and key file ##
smtpd_tls_cert_file = /etc/ssl/certs/postfixcert.pem 
smtpd_tls_key_file = /etc/ssl/private/postfixkey.pem 
smtpd_use_tls=yes 

## server will announce STARTTLS ##
smtp_tls_note_starttls_offer = yes 

smtpd_tls_session_cache_timeout = 3600s

Restart Postfix

service postfix restart


Cek Relay

$ telnet mail.example.tst 25

ehlo  mail.example.tst
250- mail.example.tst
250-PIPELINING 
250-SIZE 10240000 
250-VRFY 
250-ETRN 
250-STARTTLS 
250-AUTH PLAIN LOGIN 
250-AUTH=PLAIN LOGIN 
250-ENHANCEDSTATUSCODES 
250-8BITMIME 
250 DSN


Cek SMTP AUTH Support

Lakukan 

telnet onnocenter.id 25

Harusnya keluar 

Connected to onnocenter.id.
Escape character is '^]'.
220 onnocenter.id ESMTP
ehlo onnocenter.id
250-onnocenter.id
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN

Buat password 

printf 'username\0username\0password' | mmencode

atau 

perl -MMIME::Base64 -e 'print encode_base64("username\0username\0password");'

Lakukan seperti 

printf 'test\0test\0testpass' | mmencode
dGVzdAB0ZXN0AHRlc3RwYXNz

Maka dGVzdAB0ZXN0AHRlc3RwYXNz adalah Base64 encoded string yang berisi username dan password.

Test authentication 

Connected to localhost.
Escape character is '^]'.
220 onnocenter.id ESMTP
ehlo onnocenter.id
250-onnocenter.id
250-PIPELINING
250-SIZE 10240000
250-VRFY
250-ETRN
250-STARTTLS
250-AUTH PLAIN LOGIN
250-AUTH=PLAIN LOGIN
250-ENHANCEDSTATUSCODES
250-8BITMIME
250 DSN
AUTH PLAIN dGVzdAB0ZXN0AHRlc3RwYXNz
235 2.7.0 Authentication successful
quit
221 2.0.0 Bye

Referensi

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