Added an implementation of GSSAPI interface to support Kerberos SSPI within OpenSSH. This is only a partial definition of the full GSSAPI specification since OpenSSH only requires a subset of the overall GSSAPI functionality.
OpenSSh privilege separation model - http://www.citi.umich.edu/u/provos/ssh/privsep.html
Posix_spawn is implemented in POSIX adapter as an alternative to fork() that is heavily used in Privilege separation.
Additional state info is added to sshd to accommodate distinguishing the various modes (privileged monitor, unprivileged child, authenticated child).
Required service state (like config and host keys) is transmitted over pipes from monitor to child processes.
Changes to installation scripts and tests to accomodate new architectural changes
Manoj Ampalam
Bryan Berns
bagajjal
Yanbing