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# $Id$ |
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# $Log$ |
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###################################### |
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=pod |
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=head2 Sendmail TLS + Cyrus IMAP/SASL + LDAP + AMaViS + Kerberos V HowTo |
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|
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Sebastian Utz S<seut@netfrag.org> |
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B<last changes> |
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Revision 1.1 2003/01/27 09:11:05 jonen |
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+ create new |
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=head3 Description |
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|
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Install and configure Sendmail with TLS, Cyrus IMAP/SASL, LDAP, and Kerberos V support |
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The installation instructions described here are mainly debian only. |
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For detailed installation instructions take a look at L<Resources|resources>, |
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e.g. the "OpenLDAP, OpenSSL, SASL and KerberosV HOWTO" from Turbo Fredriksson explains a lot (great stuff!)... |
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=head3 Prerequisites |
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|
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To use all described features to sendmail the following have to be installed: |
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- Cyrus SASL v1 http://asg.web.cmu.edu/cyrus/sasl/ |
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- Cyrus IMAP v1 http://asg.web.cmu.edu/cyrus/sasl/ |
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- OpenLDAP 2 http://www.openldap.org/ |
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- AMaViS (Milter) http://www.amavis.org/ |
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- MIT Kerberos V http://web.mit.edu/kerberos/www/ |
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- OpenSSL http://www.openssl.org/ |
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=head3 AMaViS |
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=head4 install |
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debian testing/unstable: |
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- apt-get install amavis-milter |
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debian woody/stable: |
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- dowload latest amavis-milter_*.deb which could found at |
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http://packages.debian.org/testing/mail/amavis-milter.html |
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- dpkg -i amavis-milter_*.deb |
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other systems |
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sorry but I'm using Debian, for install instructions on other distributions look at 'Resource' section and always google. |
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will try write some docu here soon, too.... |
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=head4 configure & start amavisd |
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- edit /etc/amavid.conf to configure your local settings e.g. your used anti-virus scanner |
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- start amavid with: /etc/init.d/amavid start |
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note: you should always start amavid *before* sendmail as the amavis docu explained... |
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=head3 Install Sendmail |
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=head4 debian |
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- apt-get install sendmail |
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if software described at L<Prerequisites|prerequisites> isn't installed yet, look at |
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- http://www.netfrag.org/~jonen/computing/install_cyrus_sasl_v1.html |
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- http://www.netfrag.org/~jonen/computing/mini-howto-cyrus_imapd_v1-pam-kerberosV.html |
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- others comming soon..... |
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after installing required packages, run |
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- sendmail config |
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or some more specifing scripts under '/usr/share/sendmail/' (e.g. /usr/share/update_auth to update SASL support) |
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and follow the instructions printed, e.g. for updating TLS support: |
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- run: /usr/share/sendmail/update_tls |
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- insert at sendmail.mc |
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- debian stable/testing: include(`/etc/mail/starttls.m4')dnl |
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- debian unstable: include(`/etc/mail/tls/starttls.m4')dnl |
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- cd /etc/mail |
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- run: make |
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- restart sendmail: /etc/init.d/sendmail restart |
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- test supported features: |
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- telnet localhost 25 |
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- enter: ehlo <servername> |
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- should do some output like: |
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250-mail.netfrag.org Hello localhost [127.0.0.1], pleased to meet you |
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250-ENHANCEDSTATUSCODES |
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250-PIPELINING |
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250-EXPN |
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250-VERB |
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250-8BITMIME |
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250-SIZE |
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250-DSN |
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250-ETRN |
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250-AUTH GSSAPI CRAM-MD5 PLAIN LOGIN |
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250-STARTTLS |
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250-DELIVERBY |
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250 HELP |
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the 'AUTH GSSAPI CRAM-MD5 PLAIN LOGIN' and 'STARTTLS' is most important to us cause this means, |
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gssapi, digestmd5 and plain authentication is supported and also TLS is enabled. |
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=head4 other systems |
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sorry but I'm using Debian, for install instructions on other distributions look at 'Resource' section and always google. |
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will try write some docu here soon, too.... |
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=head3 Configure Sendmail |
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=head4 general sendmail.mc configurations: |
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comming soon.... |
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=head3 Configure Sendmail + SASL v1 |
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=head4 debian |
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- run /usr/share/sendmail/update_auth |
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=head4 sendmail.mc configurations(not needed at debian) |
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TRUST_AUTH_MECH(`GSSAPI PLAIN LOGIN')dnl |
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define(`confAUTH_MECHANISMS', `GSSAPI PLAIN LOGIN')dnl |
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=head3 Configure Sendmail + Cyrus IMAP v1 |
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=head4 sendmail.mc configurations |
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dnl # Cyrus Imap |
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dnl # |
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define(`confLOCAL_MAILER', `cyrus') |
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define(`CYRUS_MAILER_FLAGS', `A5@/:|')dnl |
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define(`CYRUS_MAILER_PATH', `/usr/sbin/cyrdeliver')dnl |
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define(`CYRUS_MAILER_ARGS', `cyrdeliver -e -q -m $h -- $u ')dnl |
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define(`CYRUS_MAILER_USER', `cyrus:mail')dnl |
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define(`CYRUS_BB_MAILER_FLAGS', `')dnl |
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define(`CYRUS_BB_MAILER_ARGS', `cyrdeliver -e -q -m $u ')dnl |
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dnl # |
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MAILER(cyrus)dnl |
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|
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LOCAL_CONFIG |
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## Custom configurations below (will be preserved) |
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LOCAL_RULE_0 |
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R$=I $: $#cyrus $: $1 |
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R$=I < @ $=w . > $: $#cyrus $: $1 |
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R$=I < @ $=R . > $: $#cyrus $: $1 |
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Rbb + $+ < @ $=w . > $#cyrusbb $: $1 |
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=head3 Configure Sendmail + TLS |
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=head4 debian |
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- run /usr/share/sendmail/update_tls & place 'include(`/etc/mail/starttls.m4')dnl' at sendmail.mc |
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- make & restart sendmail |
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- see "Install Sendmail" for details... |
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=head4 other systems |
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comming soon...... |
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=head4 sendmail.mc configurations(not needed at debian) |
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TRUST_AUTH_MECH(`GSSAPI PLAIN LOGIN')dnl |
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define(`confAUTH_MECHANISMS', `GSSAPI PLAIN LOGIN')dnl |
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=head3 PAM + LDAP + MIT Kerberos V |
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=head4 Authentication/Authorizisation via pam_ldap |
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- edit /etc/pam.d/smtp as follow: |
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auth reqired pam_ldap.so |
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account required pam_ldap.so |
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=head4 Authentication via MIT Kerberos V - gssapi and pam_krb5 |
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=head5 Some note on MIT Kerberos V |
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If SASL is compiled with 'gssapi' support, sendmail would support KerberosV/gssapi Authentication, |
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but as I can't found any documentation about kerberosV support at up-to-date mail-clients (Evolution does kerberos4, but no gssapi... ;-( ), |
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i'm using pam_krb5 with a lots of drawbacks against real gssapi! |
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Short quote from Kerberos V5 Installation Guide (http://web.mit.edu/kerberos/www/krb5-1.2/krb5-1.2.7/doc/install.html#SEC3): |
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"Under Kerberos, a client (generally either a user or a service) sends a request for a ticket to the Key Distribution Center (KDC). |
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The KDC creates a ticket-granting ticket (TGT) for the client, encrypts it using the client's password as the key, |
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and sends the encrypted TGT back to the client. The client then attempts to decrypt the TGT, using its password. |
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If the client successfully decrypts the TGT (i.e., if the client gave the correct password), it keeps the decrypted TGT, |
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which indicates proof of the client's identity." |
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As you read, no passwords would go over the network, so security would be much improved! |
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=head5 pam_krb5 |
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If pam_krb5 is used, PAM will request a 'faked' ticket for the deamons which you want authenticate on. |
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Also only PLAIN passwords are supported, which means, PLAIN passwords will go over your network |
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what would be very unsecure! |
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But if we are using TLS (which is always a good idea), passwords will go through a Secure Transport Layer |
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which encrypts the whole connection, so pam_krb5 over TLS would be ok for now.... |
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- edit /etc/pam.d/smtp as follow: |
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auth required pam_krb5.so |
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account required pam_ldap.so |
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=head4 sendmail.mc configurations |
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- read http://www.sendmail.org/m4/ldap_routing.html !! |
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- i added an 'sendmail' user to ldap like followed which allows sendmail to query request: |
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uid=sendmail,ou=People,dc=netfrag,c=org |
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objectClass: top |
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objectClass: account |
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objectClass: possixAccount |
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uid: sendmail |
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cn: sendmail account |
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uidNumber: 25 |
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gidNumber: 25 |
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homeDirectory: /etc/mail |
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userPassword:: |
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- set default bind DN after ' -b' |
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- set sendmail user, used for query requests after '-d' |
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- other option, but still not tested/needed (kerberos5/gssapi supported ?) |
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-m <authentication mechanism> (none | simple | krb4) |
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-P <passinfo> (/path/to/passwd_containing_file | /path/to/krb4_ticket) |
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dnl # define LDAP server used for routing |
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define(`confLDAP_DEFAULT_SPEC',`-h ldap.netfrag.org -b ou=Mail,dc=netfrag,dc=org -d uid=sendmail,ou=People,dc=netfrag,dc=org')dnl |
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dnl # define path to file which includes routeabled domains |
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LDAPROUTE_DOMAIN_FILE(`/etc/mail/ldapdomains')dnl |
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dnl # switch ldap routing on |
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FEATURE(ldap_routing)dnl |
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- example '/etc/mail/ldapdomains': |
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netfrag.org |
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example.com |
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your-domain.com |
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=head4 query 'aliases' against ldap |
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- To use the default schema, simply use(at sendmail.mc): |
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define(`ALIAS_FILE', `ldap:') |
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- By doing so, you will use the default schema which expands to a map declared as follows: |
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ldap -k (&(objectClass=sendmailMTAAliasObject) |
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(sendmailMTAAliasGrouping=aliases) |
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(|(sendmailMTACluster=${sendmailMTACluster}) |
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(sendmailMTAHost=$j)) |
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(sendmailMTAKey=%0)) |
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-v sendmailMTAAliasValue |
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- Example LDAP LDIF entries might be: |
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dn: sendmailMTAKey=test-aliases, ou=Mail, dc=netfrag, dc=org |
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objectClass: top |
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objectClass: sendmailMTA |
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objectClass: sendmailMTAAlias |
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objectClass: sendmailMTAAliasObject |
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sendmailMTAAliasGrouping: aliases |
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sendmailMTAHost: mail.netfrag.org |
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sendmailMTAKey: test-aliases |
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sendmailMTAAliasValue: jonen |
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dn: sendmailMTAKey=postmaster, ou=Mail, dc=netfrag, dc=org |
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objectClass: top |
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objectClass: sendmailMTA |
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objectClass: sendmailMTAAlias |
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objectClass: sendmailMTAAliasObject |
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sendmailMTAAliasGrouping: aliases |
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sendmailMTACluster: Servers |
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sendmailMTAKey: postmaster |
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sendmailMTAAliasValue: jonen |
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=head4 query map definitions (e.g. virtusertable, mailertable, access_db, etc.) against ldap |
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- read http://www.sendmail.org/m4/ldap.html !! |
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- example for 'virtusertable' (other map definitions goes near the same way..): |
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- sendmail.mc: |
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FEATURE(`virtusertable', `LDAP') |
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- add sendmailMTAMapName (have to be created for each map definition!!) |
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dn: sendmailMTAMapName=virtuser, ou=Mail, dc=netfrag, dc=org |
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objectClass: top |
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objectClass: sendmailMTA |
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objectClass: sendmailMTAMap |
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sendmailMTAHost: mail.netfrag.org |
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sendmailMTAMapName: virtuser |
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- example virtuser entries: |
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dn: sendmailMTAKey=test-virtuser@netfrag.com, ou=Mail, dc=netfrag, dc=org |
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objectClass: sendmailMTA |
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objectClass: sendmailMTAMap |
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objectClass: sendmailMTAMapObject |
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sendmailMTAMapName: virtuser |
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sendmailMTAHost: mail.netfrag.org |
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sendmailMTAKey: test-virtuser@netfrag.org |
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sendmailMTAMapValue: jonen |
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dn: sendmailMTAKey=no-user@example.com, ou=Mail, dc=netfrag, dc=org |
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objectClass: sendmailMTA |
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objectClass: sendmailMTAMap |
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objectClass: sendmailMTAMapObject |
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sendmailMTAMapName: virtuser |
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sendmailMTAHost: mail.netfrag.org |
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sendmailMTAKey: no-user@example.com |
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sendmailMTAMapValue: error: no-user@example.com doesn't exits here |
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=head3 Configure Sendmail Milter + AMaViS |
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=head4 sendmail.mc configurations |
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define(`MILTER', 1) |
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INPUT_MAIL_FILTER(`milter-amavis',`S=local:/var/run/amavis/amavis-milter.sock, F=T, T=S:10m;R:10m;E:10m') |
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=head3 Resources |
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=over |
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=item Sendmail |
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http://www.sendmail.org/ |
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=item LDAP Implementation HOWTO |
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http://www.tldp.org/HOWTO/LDAP-Implementation-HOWTO/ |
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=item OpenLDAP |
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http://www.openldap.org/ |
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=item MIT Kerberos V5 |
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http://web.mit.edu/kerberos/www/ |
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=item Kerberos Authenticated SMTP Service Installation Instructions |
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http://www.upenn.edu/computing/pennkey/sysadmin/d_install_unix/smtp.html |
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=item sendmail with LDAP, TLS and AUTH |
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http://logout.sh/computers/sendmail/ |
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=item Sendmail + LDAP HOWTO |
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http://www.iconimaging.net/~jradford/sendmail/sendmail-ldap.html |
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=item Sendmail mit Milter, AMaViS, Cyrus IMAP + SSL, Anti Spam |
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http://wwwhomes.uni-bielefeld.de/schoppa/saia-howto.html |
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=item Sendmail mit Milter, AMaViS, Anti Spam, Cyrus IMAP auf Debian woody Basis |
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http://wwwhomes.uni-bielefeld.de/schoppa/saia-woody-howto.html |
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=item AMaViS |
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http://www.amavis.org/ |
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=back |
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=head3 ToDo |
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|
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o seems NO mail-client currently supports kerberos V tickets, DO MORE RESEARCH! |
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x so use pam_krb5 |
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o if so, seems only PLAIN password authentication works (no Digest-MD5 or others!) |
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x so usage of TLS/SSL for secure trasport layer is recommend |
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o docu installation for other distribution than Debian |
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o check out Cyrus Imapd v2 and SASL v2 more and write howto |
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o MORE docu !! |
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=cut |
Parent Directory
| 
Revision Log
