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-## 20.10 SMTP Authentication \r
-\r
-***Written by James Gorham. ***\r
-\r
-Having SMTP Authentication in place on your mail server has a number of benefits. SMTP Authentication can add another layer of security to **sendmail** , and has the benefit of giving mobile users who switch hosts the ability to use the same mail server without the need to reconfigure their mail client settings each time.\r
-\r
- 1. Install [`security/cyrus-sasl`](http://pkgsrc.se/security/cyrus-sasl) from the ports. You can find this port in [`security/cyrus-sasl`](http://pkgsrc.se/security/cyrus-sasl). [`security/cyrus-sasl`](http://pkgsrc.se/security/cyrus-sasl) has a number of compile time options to choose from and, for the method we will be using here, make sure to select the `pwcheck` option.\r
- 1. After installing [`security/cyrus-sasl`](http://pkgsrc.se/security/cyrus-sasl), edit `/usr/local/lib/sasl/Sendmail.conf` (or create it if it does not exist) and add the following line:\r
- \r
- pwcheck_method: passwd\r
- \r
- This method will enable **sendmail** to authenticate against your DragonFly `passwd` database. This saves the trouble of creating a new set of usernames and passwords for each user that needs to use SMTP authentication, and keeps the login and mail password the same.\r
- 1. Now edit `/etc/make.conf` and add the following lines:\r
- \r
- SENDMAIL_CFLAGS=-I/usr/local/include/sasl1 -DSASL\r
- SENDMAIL_LDFLAGS=-L/usr/local/lib\r
- SENDMAIL_LDADD=-lsasl\r
- \r
- These lines will give **sendmail** the proper configuration options for linking to [`cyrus-sasl`](http://pkgsrc.se/cyrus-sasl) at compile time. Make sure that [`cyrus-sasl`](http://pkgsrc.se/cyrus-sasl) has been installed before recompiling **sendmail** .\r
- 1. Recompile **sendmail** by executing the following commands:\r
- \r
- # cd /usr/src/usr.sbin/sendmail\r
- # make cleandir\r
- # make obj\r
- # make\r
- # make install\r
- \r
- The compile of **sendmail** should not have any problems if `/usr/src` has not been changed extensively and the shared libraries it needs are available.\r
- 1. After **sendmail** has been compiled and reinstalled, edit your `/etc/mail/freebsd.mc` file (or whichever file you use as your `.mc` file. Many administrators choose to use the output from [hostname(1)](http://leaf.dragonflybsd.org/cgi/web-man?command#hostname§ion1) as the `.mc` file for uniqueness). Add these lines to it:\r
- \r
- dnl set SASL options\r
- TRUST_AUTH_MECH(`GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN')dnl\r
- define(`confAUTH_MECHANISMS', `GSSAPI DIGEST-MD5 CRAM-MD5 LOGIN')dnl\r
- define(`confDEF_AUTH_INFO', `/etc/mail/auth-info')dnl\r
- \r
- These options configure the different methods available to **sendmail** for authenticating users. If you would like to use a method other than **pwcheck** , please see the included documentation.\r
- 1. Finally, run [make(1)](http://leaf.dragonflybsd.org/cgi/web-man?command#make§ion1) while in `/etc/mail`. That will run your new `.mc` file and create a `.cf` file named `freebsd.cf` (or whatever name you have used for your `.mc` file). Then use the command `make install restart`, which will copy the file to `sendmail.cf`, and will properly restart **sendmail** . For more information about this process, you should refer to `/etc/mail/Makefile`.\r
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-If all has gone correctly, you should be able to enter your login information into the mail client and send a test message. For further investigation, set the `LogLevel` of **sendmail** to 13 and watch `/var/log/maillog` for any errors.\r
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-You may wish to add the following lines to `/etc/rc.conf` so this service will be available after every system boot:\r
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- \r
- sasl_pwcheck_enable="YES"\r
- sasl_pwcheck_program="/usr/local/sbin/pwcheck"\r
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-This will ensure the initialization of SMTP_AUTH upon system boot.\r
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-For more information, please see the **sendmail** page regarding [SMTP authentication](http://www.sendmail.org/~ca/email/auth.html).\r
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-CategoryHandbook\r
-CategoryHandbook-email\r
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