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FreeBSD maintainer's guide to OpenSSH-portable
==============================================
XXX
XXX this needs a complete rewrite
XXX svn merge from vendor branch, resolve conflicts manually
XXX (see FREEBSD-tricks for tips on how to reduce conflicts)
XXX run freebsd-configure.sh to generate config.h and krb5_config.h
XXX svn diff Makefile.in to see if the Makefiles need adjusting
XXX
0) Make sure your mail spool has plenty of free space. It'll fill up
pretty fast once you're done with this checklist.
1) Grab the latest OpenSSH-portable tarball from the OpenBSD FTP
site (ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/)
2) Unpack the tarball in a suitable directory.
$ tar xf openssh-X.YpZ.tar.gz \
-X /usr/src/crypto/openssh/FREEBSD-Xlist
3) Remove trash:
Make sure -X took care of everything, and if it didn't, make sure
to update FREEBSD-Xlist so you won't miss it the next time. A good
way to do this is to run a test import and see if any new files
show up:
$ cvs -n import src/crypto/openssh OPENSSH x | grep \^N
4) Import the sources:
$ cvs import src/crypto/openssh OPENSSH OpenSSH_X_YpZ
5) Resolve conflicts. Remember to bump the version number and
addendum in version.h, and update the default value in
ssh{,d}_config and ssh{,d}_config.5.
6) Generate configure and config.h.in:
$ autoconf
$ autoheader
Note: this requires a recent version of autoconf, not autoconf213.
7) Run configure with the appropriate arguments:
$ ./configure --prefix=/usr --sysconfdir=/etc/ssh \
--with-pam --with-tcp-wrappers --with-libedit \
--with-ssl-engine
This will regenerate config.h, which must be committed along with
the rest.
Note that we don't want to configure OpenSSH for Kerberos using
configure since we have to be able to turn it on or off depending
on the value of MK_KERBEROS. Our Makefiles take care of this.
8) If source files have been added or removed, update the appropriate
makefiles to reflect changes in the vendor's Makefile.in.
9) Build libssh. Follow the instructions in ssh_namespace.h to get a
list of new symbols. Update ssh_namespace.h, build everything,
install and test.
A) Build and test the pam_ssh PAM module. It gropes around libssh's
internals and will break if something significant changes or if
ssh_namespace.h is out of whack.
B) Re-commit everything on repoman (you *did* use a test repo for
this, didn't you?)
An overview of FreeBSD changes to OpenSSH-portable
==================================================
0) VersionAddendum
The SSH protocol allows for a human-readable version string of up
to 40 characters to be appended to the protocol version string.
FreeBSD takes advantage of this to include a date indicating the
"patch level", so people can easily determine whether their system
is vulnerable when an OpenSSH advisory goes out. Some people,
however, dislike advertising their patch level in the protocol
handshake, so we've added a VersionAddendum configuration variable
to allow them to change or disable it.
1) Modified server-side defaults
We've modified some configuration defaults in sshd:
- PasswordAuthentication defaults to "no".
- LoginGraceTime defaults to 120 seconds instead of 600.
- PermitRootLogin defaults to "no".
- X11Forwarding defaults to "yes" (it's a threat to the client,
not to the server.)
2) Modified client-side defaults
We've modified some configuration defaults in ssh:
- CheckHostIP defaults to "no".
3) Canonic host names
We've added code to ssh.c to canonicize the target host name after
reading options but before trying to connect. This eliminates the
usual problem with duplicate known_hosts entries.
4) setusercontext() environment
Our setusercontext(3) can set environment variables, which we must
take care to transfer to the child's environment.
This port was brought to you by (in no particular order) DARPA, NAI
Labs, ThinkSec, Nescafé, the Aberlour Glenlivet Distillery Co.,
Suzanne Vega, and a Sanford's #69 Deluxe Marker.
-- des@FreeBSD.org
$FreeBSD$
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