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The final option allows you to overcome issues with the location of com_err.h during compilation. If your make fails with an error indicating that it cannot find com_err.h, then you can overcome these issues by installing com_err.h into the include directory of your choice. Listing 9-3. Overcoming com_err.h Compile Errors in Cyrus IMAP puppy# cd path/to/Cyrus/source/et puppy# cp com_err.h /usr/local/include If you do not want to install the com_err.h include file, then you can also point Cyrus IMAP to the file using a configure option. Listing 9-4 shows the previous configure statement with the option added. Listing 9-4. Specifying the Location of the com_err.h File Using configure puppy# ./configure --with-sasl=/usr/lib/sasl2 --with-openssl=/usr/lib/ssl \ --with-auth=unix -with-com_err=/path/to/Cyrus/source/et After you have configured Cyrus IMAP you need to make and install it. Listing 9-5 shows , the relevant commands. Listing 9-5. Making and Installing Cyrus IMAP puppy# make && make install By default Cyrus IMAP installs the Cyrus binaries into /usr/cyrus. (You can override this with the --with-cyrus-prefix configure option.)
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Installing Cyrus IMAP into a chroot Jail
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I will take you through the basics of configuring Cyrus IMAP in a chroot jail. First, you should create a directory structure to hold the chroot jail. I have created a directory called /chroot/cyrus in the root directory by entering the following: puppy# mkdir -R /chroot/cyrus Second, you need to create some additional directories under /chroot/cyrus. Listing 9-6 shows the directories and directory you need to create. Listing 9-6. Cyrus IMAP chroot Directory Structure /dev /etc /lib /lib/tls /tmp /usr /usr/cyrus /usr/cyrus/bin /usr/lib /usr/lib/sasl2
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/var /var/imap /var/imap/db /var/imap/log /var/imap/msg /var/imap/proc /var/imap/ptclient /var/imap/socket /var/run /var/spool /var/spool/imap /var/spool/imap/stage.
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s Note The trailing full stop, ., in the last directory in Listing 9-6 needs to be there.
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Adding Cyrus IMAP Binaries and Libraries to the chroot Jail
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Now you need to populate your Cyrus IMAP installation. I will start with the Cyrus IMAP binaries. If you have installed them in the standard location, then copy the binaries into the chroot jail using the following command; otherwise, copy them from wherever you installed them. puppy# cp /usr/cyrus/bin/* /chroot/cyrus/usr/cyrus/bin
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s If you are not using the sieve application, you should not copy the sievec and timsieved binaries. Tip
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Next, you need to add the required libraries to the chroot jail. Cyrus Mail will also require a variety of libraries to run correctly in the chroot jail. The best way to work this out is to run ldd on the master and lmtpd binaries. Record the list of libraries shown, and copy them into their respective locations in the chroot jail. Listing 9-7 shows the partial results of running the ldd command on the master binary and a subsequent copy of the required libraries in their correct locations in the chroot jail. You need to perform the same process for the lmtpd binary. Listing 9-7. Adding the Cyrus Mail Libraries puppy# ldd /usr/cyrus/bin/master libresolv.so.2 => /lib/libresolv.so.2 (0xb75ce000) libdb-4.1.so => /lib/libdb-4.1.so (0xb750c000) libssl.so.4 => /lib/libssl.so.4 (0xb74d7000) libcrypto.so.4 => /lib/libcrypto.so.4 (0xb73e6000) libcom_err.so.2 => /lib/libcom_err.so.2 (0xb73e4000) libc.so.6 => /lib/tls/libc.so.6 (0xb72ad000) libz.so.1 => /usr/lib/libz.so.1 (0xb7207000)
CHAPTER 9 s HARDENING REMOTE ACCESS TO E-MAIL
libpthread.so.0 => /lib/tls/libpthread.so.0 (0xb729c000) libgssapi_krb5.so.2 => /usr/kerberos/lib/libgssapi_krb5.so.2 (0xb7289000) puppy# cp /lib/libssl.so.4 /chroot/cyrus/lib puppy# cp /usr/lib/libz.o.1/chroot/cyrus/usr/lib puppy# cp /lib/tls/libpthread.so.0 /chroot/cyrus/lib/tls
s Caution If you see any libraries located in /usr/kerberos/lib in your list of Cyrus Mail libraries,
do not copy them into a similar location under the Cyrus Mail chroot; instead, copy them into /chroot/ cyrus/usr/lib. Cyrus Mail seems unable to find them otherwise.
You will also need some other libraries. Listing 9-8 lists these libraries, which are usually contained in /lib. Listing 9-8. Additional Libraries Required by Cyrus Mail libnss_files.so.2 libnss_dns.so.2 Copy the libraries from Listing 9-8 into /chroot/cyrus/lib to proceed. If you are using Cyrus SASL (which you almost certainly are), then you should copy the contents of /usr/lib/sasl2 (or /usr/local/lib/sasl2 depending where you have installed the Cyrus SASL libraries) to chroot/cyrus/lib/sasl2.
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