Export restriction prohibit us from including DES encryption routines in RPCSRC
4.0. The main RPCSRC 4.0 hierarchy does not include DES Authentication,
however this directory contains the documentation and code used to build secure
rpc. THIS DISTRIBUTION OF SECURE RPC NEEDS EXTENSIVE WORK BEFORE IT CAN BE
USED. PLEASE READ THE PORTING GUIDLINES BELOW.
HIERARCHY
bin/
This directory contains chkey and keylogin. These are user programs
used to establish the credentials of an RPC user.
demo/
The 'whoami' service is found here. It can be used to test secure RPC.
rpcgen is used to build the client and server.
des/
des_crypt.h defines the interfaces to cbc_crypt() and ecb_crypt(),
the DES routines used by DES Authentication.
des.h defines the desparams structure that is used internally by
these routines. Secure RPC expects it to be installed in
/usr/include/sys.
des_crypt.c defines the cbc_crypt() and ecb_crypt() routines. These
eventually call the routine _des_crypt(), which is *not* provided.
des_soft.c contains the des_setparity() routine.
doc/
The document "nfs.secure.ms" is found here. It describes Secure
RPC and Secure NFS.
keyserv/
This is an RPC based program that stores the private keys for
users that are using secure RPC.
man/
Manual pages for the programs and library routines are found here.
rpc/
The routines in this directory should be integrated with the
default rpc directory to make a single RPC library. The Makefile
found in this directory replaces the one in ../rpc. Note: the file
svc_auth.c in this directory replaces the one in ../rpc. Also, the
file ../rpc/rpc.h should be edited to include the file <rpc/des_auth.h>
(it presently is commented out).
PORTING GUIDELINES
You will need to provide a DES encryption routine. man/des_crypt.3 describes
the interface to ecb_crypt() and cbc_crypt() (secure RPC uses both modes). The
des/ directory has the "front-end" for these routines in the des_crypt.c file.
Since public key authentication systems require a network global data lookup
facility, this implementation uses Sun's Yellow Pages. If your site does not
have Yellow Pages, you will have to modify the routines in rpc/publickey.c and
bin/chkey.c. One possible approach is to replace the YP calls with code to
read the file /etc/publickey; this file would presumably be shared by all
secure RPC sites via NFS or some equivalent file sharing facility. If you wish
to implement YP yourself, the RPCL (.x) protocol description file can be found
in ../rpcsvc/yp.x.
The routines in rpc/ and keyserv/ assume that the file des/des_crypt.h
is installed in /usr/include (they include <des_crypt.h>). The file
des/des_crypt.c assumes that des.h is installed in /usr/include/sys (it
include <sys/des.h>). The des/ directory does not have a Makefile that
would install these header files, so you will either have to do this
by hand, or modify the routines to include the header files in a way suitable
for your site.
While the programs in bin/ and keyserv/ can be built in place (assuming
the header files they include and the RPC library are available), the files
in rpc/ must be moved into ../rpc/, the main RPC library. The Makefile and
svc_auth.c found in rpc/ will replace those found in ../rpc/. You must also
edit ../rpc/rpc.h to include <rpc/des_auth.h>.
OPERATION
Please read the documentation and manual pages for information on how to
administer secure RPC.
In the demo/ directory you'll find the 'whoami' service. This service uses DES
Authentication, and can be used to check out secure RPC. The client program,
'rme' takes a host as an argument. This host must be running the keyserv
daemon and the 'whoami_svc' server. The service returns the identity of the
client-user as known to the system on which the server is running. This
information is only returned, however, if the client request has proper DES
credentials.
