xref: /freebsd-10.0-release/crypto/openssh/FREEBSD-upgrade

	    FreeBSD maintainer's guide to OpenSSH-portable
	    ==============================================


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" when PAM is enabled.

      - For protocol version 2, we don't load RSA host keys by
        default.  If both RSA and DSA keys are present, we prefer DSA
        to RSA.

      - 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:

      - For protocol version 2, if both RSA and DSA keys are present,
        we prefer DSA to RSA.

      - 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, Nescaf�, the Aberlour Glenlivet Distillery Co.,
Suzanne Vega, and a Sanford's #69 Deluxe Marker.

					-- des@FreeBSD.org

$FreeBSD: head/crypto/openssh/FREEBSD-upgrade 181091 2008-08-01 00:28:50Z des $