Provided by: lprng_3.8.B-2.1_amd64 
NAME
lprng_certs - lprng SSL certificate management
SYNOPSIS
lprng_certs option
Options:
init - make directory structure
newca - make new root CA
defaults - set new default values for certs
gen - generate user, server, or signing cert
index [dir] - index cert files
verify [cert] - verify cert file
encrypt keyfile
- set or change keyfile password
DESCRIPTION
The lprng_certs program is used to manage SSL certificates for the LPRng software. There SSL certificate
structure consists of a hierarchy of certificates. The LPRng software assumes that the following types
of certificates will be used:
CA or root
A top level or self-signed certificate.
signing
A certificate that can be used to sign other certificates. This is signed by the root CA or
another signing certificate.
user A certificate used by a user to identify themselves to the lpd server.
server A certificate used by the lpd server to identify themselves to the user or other lpd servers.
Signing Certificates
All of the signing certificates, including the root certificate (root CA), /etc/lprng/ssl.ca/ca.crt, are
in the same directory as the root CA file. Alternately, all of the signing certs can be concatenated and
put into a single file, which by convention is assumed to have the same name as the root CA file,
/etc/lprng/ssl.ca/ca.crt. The ssl_ca_file, ssl_ca_path, and ssl_ca_key printcap and configuration
options can be used to specify the locations of the root CA files, a directory containing the signing
certificate files, and the private key file for the root CA file respectively.
The root certificate (root CA file) /etc/lprng/ssl.ca/ca.crt has a private key file
/etc/lprng/ssl.ca/ca.key as well. By convention, the private keys for the other signing certificate
files are stored in the certificate file.
The OpenSSL software requires that this directory also contain a set of hash files which are, in effect,
links to these files.
By default, all signing certificates are assumed to be in the same directory as the root certificate.
Server Certificates
The certificate used by the lpd server are kept in another directory. These files do not need to have
hash links to them. By convention, the private keys for these certificate files are stored in the
certificate file. The server certificate file is specified by the ssl_server_cert and has the default
value /etc/lprng/ssl.server/server.crt. This file contains the cert and private key. The server
certificate password file is specified by the ssl_server_password option with the default value
and contains the password used to decrypt the servers private key and use it for authentication. This
key file should be read only by the lpd server.
User Certificates
The certificates used by users are kept in a separate directory in the users home directory. By
convention, the private keys for these certificate files are stored in the certificate file.
The user certificate file is specified by the LPR_SSL_FILE environment variable, otherwise the
${HOME}/.lpr/client.crt is used. The password is taken from the file specified by the LPR_SSL_PASSWORD
environment variable, otherwise the ${HOME}/.lpr/client.pwd file is read.
USING LPRNG_CERTS
The organization of the SSL certificates used by LPRng is similar to that used by other programs such as
the Apache mod_ssl support. The lprng_certs program is used to create the directory structure, create
certificates for the root CA, signing, user and servers. In order to make management simple, the
following support is provided.
lprng_certs init
This command creates the directories used by the lpd server. It is useful when setting up a new lpd
server.
lprng_certs newca
This command creates a self-signed certificate, suitable for use as a root CA certificate. It also sets
up a set of default values for other certificate creation.
lprng_certs defaults
This command is used to modify the set of default values.
The default values are listed and should be self-explanatory, except for the value of the signer
certificate. By default, the root CA can be used to sign certificates. However, a signing certificate
can be used as well. This allows delegation of signing authority without compromising the security of
the root CA.
lprng_certs gen
This is used to generate a user, server, or signing certificate.
lprng_certs index
This is used to create the indexes for the signing certificates.
lprng_certs verify [cert]
This checks the certificate file using the Openssl openssl verify command.
lprng_certs encrypt keyfile
This removes all key information from the key file, reencrypts the key information, and the puts the
encrypted key information in the file.
LPRng OPTIONS
Option Purpose
ssl_ca_path directory holding the SSL signing certs
ssl_ca_file file holding the root CA or all SSL signing certs
ssl_server_cert cert file for the server
ssl_server_password file containing password for server server
${HOME}/.lpr/client.crt client certificate file
${HOME}/.lpr/client.pwd client certificate private key password
ENVIRONMENT VARIABLES
LPR_SSL_FILE client certificate file
LPR_SSL_PASSWORD client certificate private key password
EXIT STATUS
The following exit values are returned:
zero (0) Successful completion.
non-zero (!=0) An error occurred.
SEE ALSO
lpd.conf(5), lpc(8), lpd(8), checkpc(8), lpr(1), lpq(1), lprm(1), printcap(5), lpd.conf(5), pr(1), lprng_certs(1), lprng_index_certs(1).
AUTHOR
Patrick Powell <papowell@lprng.com>.
HISTORY
LPRng is a enhanced printer spooler system with functionality similar to the Berkeley LPR software. The
LPRng developer mailing list is lprng-devel@lists.sourceforge.net; subscribe by visiting
https://lists.sourceforge.net/lists/listinfo/lprng-devel or sending mail to lprng-
request@lists.sourceforge.net with the word subscribe in the body.
The software is available via http://lprng.sourceforge.net