131 lines
3.9 KiB
Plaintext
131 lines
3.9 KiB
Plaintext
|
||
|
||
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.
|
||
|
||
3) Remove trash:
|
||
|
||
$ eval "rm -rf $(tr '[:space:]' ' ' </usr/src/crypto/openssh/FREEBSD-Xlist)"
|
||
|
||
Make sure that took care of everything, and if it didn't, make sure
|
||
to update FREEBSD-Xlist so you won't miss it the next time.
|
||
|
||
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.
|
||
|
||
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
|
||
|
||
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 MAKE_KERBEROS[45]. Our Makefiles take care of
|
||
this.
|
||
|
||
8) Commit the resulting config.h. Make sure you don't accidentally
|
||
commit any other files created by autoconf, autoheader or
|
||
configure; they'll just clutter up the repo and cause trouble at
|
||
the next upgrade.
|
||
|
||
9) Build and test.
|
||
|
||
A) Re-commit everything on freefall (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:
|
||
|
||
- 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.)
|
||
|
||
- Unless the config file says otherwise, we automatically enable
|
||
Kerberos support if an appropriate keytab is present.
|
||
|
||
- PAMAuthenticationViaKbdInt defaults to "yes".
|
||
|
||
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) OPIE
|
||
|
||
We've added support for using OPIE as a drop-in replacement for
|
||
S/Key.
|
||
|
||
5) PAM
|
||
|
||
We use our own PAM code, which wraps PAM in a KbdintDevice and
|
||
works with privsep, instead of OpenSSH's own PAM code.
|
||
|
||
6) 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<61>, the Aberlour Glenlivet Distillery Co.,
|
||
Suzanne Vega, and a Sanford's #69 Deluxe Marker.
|
||
|
||
-- des@FreeBSD.org
|
||
|
||
$FreeBSD$
|