131 lines
3.8 KiB
Plaintext
131 lines
3.8 KiB
Plaintext
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FreeBSD maintainer's guide to OpenSSH-portable
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==============================================
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0) Make sure your mail spool has plenty of free space. It'll fill up
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pretty fast once you're done with this checklist.
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1) Grab the latest OpenSSH-portable tarball from the OpenBSD FTP
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site (ftp://ftp.openbsd.org/pub/OpenBSD/OpenSSH/portable/)
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2) Unpack the tarball in a suitable directory.
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3) Remove trash:
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$ rm -rf $(cat FREEBSD-Xlist)
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Make sure that took care of everything, and if it didn't, make sure
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to update FREEBSD-Xlist so you won't miss it the next time.
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4) Import the sources:
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$ cvs import src/crypto/openssh-portable OPENSSH OpenSSH_X_YpZ
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5) Resolve conflicts. Remember to bump the version number and
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addendum in version.h.
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6) Generate configure and config.h.in:
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$ autoconf
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$ autoheader
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Note: this requires a recent version of autoconf, not autoconf213.
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7) Run configure with the appropriate arguments:
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$ ./configure --prefix=/usr --sysconfdir=/etc/ssh \
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--with-pam --with-opie --with-tcp-wrappers
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Note that we don't want to configure OpenSSH for Kerberos using
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configure since we have to be able to turn it on or off depending
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on the value of MAKE_KERBEROS[45]. Our Makefiles take care of
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this.
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8) Commit the resulting config.h. Make sure you don't accidentally
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commit any other files created by autoconf, autoheader or
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configure; they'll just clutter up the repo and cause trouble at
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the next upgrade.
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9) Build and test.
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A) Re-commit everything on freefall (you *did* use a test repo for
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this, didn't you?)
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An overview of FreeBSD changes to OpenSSH-portable
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==================================================
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0) VersionAddendum
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The SSH protocol allows for a human-readable version string of up
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to 40 characters to be appended to the protocol version string.
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FreeBSD takes advantage of this to include a date indicating the
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"patch level", so people can easily determine whether their system
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is vulnerable when an OpenSSH advisory goes out. Some people,
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however, dislike advertising their patch level in the protocol
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handshake, so we've added a VersionAddendum configuration variable
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to allow them to change or disable it.
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1) Modified server-side defaults
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We've modified some configuration defaults in sshd:
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- For protocol version 2, we don't load RSA host keys by
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default. If both RSA and DSA keys are present, we prefer DSA
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to RSA.
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- LoginGraceTime defaults to 120 seconds instead of 600.
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- PermitRootLogin defaults to "no".
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- X11Forwarding defaults to "yes" (it's a threat to the client,
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not to the server.)
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- Unless the config file says otherwise, we automatically enable
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Kerberos support if an appropriate keytab is present.
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- PAMAuthenticationViaKbdInt defaults to "yes".
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2) Modified client-side defaults
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We've modified some configuration defaults in ssh:
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- For protocol version 2, if both RSA and DSA keys are present,
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we prefer DSA to RSA.
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- CheckHostIP defaults to "no".
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3) Canonic host names
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We've added code to ssh.c to canonicize the target host name after
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reading options but before trying to connect. This eliminates the
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usual problem with duplicate known_hosts entries.
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4) OPIE
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We've added support for using OPIE as a drop-in replacement for
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S/Key.
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5) PAM
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We use our own PAM code, which wraps PAM in a KbdintDevice and
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works with privsep, instead of OpenSSH's own PAM code.
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6) setusercontext() environment
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Our setusercontext(3) can set environment variables, which we must
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take care to transfer to the child's environment.
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This port was brought to you by (in no particular order) DARPA, NAI
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Labs, ThinkSec, Nescaf<61>, the Aberlour Glenlivet Distillery Co.,
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Suzanne Vega, and a Sanford's #69 Deluxe Marker.
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-- des@FreeBSD.org
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$FreeBSD$
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