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GENERAL INFORMATION
The Solid POP3 Server is an implementation of a Post Office Protocol version 3
server that has flexibility as its main goal. The server is easily
configurable and has support for few features such as:
- APOP authentication scheme
- virtual hosting
- maildir and mailbox handling
- bulletins
- expiration of messages
Each user can specify his maildrop (its position and type). The format
used in specification of maildrop's position should handle almost all
widely-used system configurations. The server also seems to be fast, however no
tests have been performed, so it's rather relative feeling. The design used
is very similar to the design of Solar Designer's POPA3D server. This solution
let's minimalize size of code working with root privileges. The code was also
heavily checked for buffer overflow leaks and file races. None have been found
as for now. All operations on files are done with user privileges. There
is no SUID APOP secrets database management program (as in QPOP). Each user
can specify his secret in his own home directory.
Default maildrop name is /var/spool/mail/%s (read spop3d(8) manual).
Most Linux distributions work with this setting. However on other systems
you should change this value (use "-n" option or edit src/const.h).
The newest version of the server is available under:
ftp://ftp.rudykot.pl/pub/solidpop3d
ftp://sedez.iq.pl/pub/solidpop3d
ftp://dione.ids.pl/pub/solidpop3d
Homepage:
http://solidpop3d.pld.org.pl/
Any suggestions, bug reports, information about successful ports should go to:
Jerzy Balamut <jurekb@dione.ids.pl>
INSTALLING
Consult INSTALL file for generic instructions about installing.
Existance of the user "spop3d" in system is required. Big part of the server
works with this user privileges. Following ./configure options are recognized:
--enable-pam - add PAM support
--enable-apop - add APOP authentication scheme support
--enable-mailbox - add mailbox handling support
--enable-maildir - add maildir handling support
--enable-bulletins - add bulletins support
--enable-expire - add support for message expiration
--enable-standalone - compile server as a standalone server, not inetd
server (which is default)
--enable-configfile - add support for global configuration file
--enable-userconfig - add support for user configuration file
--enable-last - add support for LAST command
--enable-mapping - add support for user names mapping
--enable-nonip - add support for non-IP based virtuals
--enable-allowroot - add support for "AllowRootLogin" option
--enable-createmail - add support for "CreateMailDrop" option
--enable-ipv6 - add support for IPv6 protocol
--enable-resolve - log resolved host name with IP number
--enable-connect - log "connect from xxx" message
--enable-logextend - log peer IP number in few additional places
Support for mailbox, maildir, expiration, configfile and userconfig
is enabled by default. You can change in the file src/const.h default
values for some options.
WARNING: The global configuration file should be readable by the "spop3d"
user!!!
Simple installation process could look like this:
$ ./configure
$ make
$ su
# useradd -d /nonexistent -s /nonexistent -M spop3d
# make install
# echo pop3 stream tcp nowait root /usr/sbin/tcpd /usr/local/sbin/spop3d >> /etc/inetd.conf
# killall -HUP inetd
WARNING: On some systems you should replace "pop3" with "pop-3".
BULLETINS
Server looks for bulletins in directory ${localstatedir}/bulletins (default:
/usr/local/var/bulletins). For each bulletin (file) its modification time
is checked. If this modification time is more recent than the modification time
of the file UserBullFile this bulletin is added to user's maildrop. Server
touches the modification time of the file UserBullFile after all bulletins
are checked. The directory ${localstatedir} and bulletins should be accessable
by any user. Default value for UserBullFile is ".spop3d-bull". Read
spop3d.conf(5) manual for details.
APOP
Warning: Use APOP only if you really need it (and probably you don't).
It isn't such secure as it looks.
COPYRIGHT
The program is distributed under GNU General Public License.
See the file COPYING for details.
Jerzy Balamut <jurekb@dione.ids.pl>
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