|--findid=string||The --findid flag causes pgpverify to explicitly search for string in the output from PGPs analysis of the message. This option is useful when several UIDs are defined on a single PGP key, and the caller to pgpverify needs checking whether a given one is defined on this key. In case the signature is valid but does not contain string, pgpverify exits with exit status 4.|
|--test||The --test flag causes pgpverify to print out the input that it is passing to PGP (which is a reconstructed version of the input that supposedly created the control message) as well as the output from PGPs analysis of the message.|
pgpverify may exit with the following statuses:
0 The control message had a good PGP signature. 1 The control message had no PGP signature. 2 The control message had an unknown PGP signature. 3 The control message had a bad PGP signature. 4 The control message had a good PGP signature but the argument given to the --findid flag had non been found in the output from PGPs analysis of the message. 255 A problem occurred not directly related to PGP analysis of signature.
pgpverify does not modify or otherwise alter the environment before invoking the pgp or gpgv program. It is the responsibility of the person who installs pgpverify to ensure that when pgp or gpgv runs, it has the ability to locate and read a PGP key file that contains the PGP public keys for the appropriate Usenet hierarchy administrators. pgpverify can be pointed to an appropriate key ring by editing variables at the beginning of this script.
Historically, Usenet news server administrators have configured their news servers to automatically honor Usenet control messages based on the originator of the control messages and the hierarchies for which the control messages applied. For example, in the past, David Lawrence always issued control messages for the Big 8 hierarchies (comp, humanities, misc, news, rec, sci, soc, talk). Usenet news administrators would configure their news server software to automatically honor newgroup and rmgroup control messages that originated from David Lawrence and applied to any of the Big 8 hierarchies.
Unfortunately, Usenet news articles (including control messages) are notoriously easy to forge. Soon, malicious users realized they could create or remove (at least temporarily) any Big 8 newsgroup they wanted by simply forging an appropriate control message in David Lawrences name. As Usenet became more widely used, forgeries became more common.
The pgpverify program was designed to allow Usenet news administrators to configure their servers to cryptographically verify control messages before automatically acting on them. Under the pgpverify system, a Usenet hierarchy maintainer creates a PGP public/private key pair and disseminates the public key. Whenever the hierarchy maintainer issues a control message, he uses the signcontrol program to sign the control message with the PGP private key. Usenet news administrators configure their news servers to run the pgpverify program on the appropriate control messages, and take action based on the PGP key User ID that signed the control message, not the name and address that appear in the control messages From: or Sender: headers.
Thus, appropriate use of the signcontrol and pgpverify programs essentially eliminates the possibility of malicious users forging Usenet control messages that sites will act upon, as such users would have to obtain the PGP private key in order to forge a control message that would pass the cryptographic verification step. If the hierarchy administrators properly protect their PGP private keys, the only way a malicious user could forge a validly-signed control message would be by breaking the public key encryption algorithm, which (at least at this time) is believed to be prohibitively difficult for PGP keys of a sufficient bit length.
pgpverify was written by David C Lawrence <firstname.lastname@example.org>. Manual page provided by James Ralston. It is currently maintained by Russ Allbery <email@example.com>.
David Lawrence wrote: Our lawyer told me to include the following. The upshot of it is that you can use the software for free as much as you like.
Copyright (c) 1996 UUNET Technologies, Inc. All rights reserved.
Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:
THIS SOFTWARE IS PROVIDED BY UUNET AS IS AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL UUNET BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution. 3. All advertising materials mentioning features or use of this software must display the following acknowledgement:
This product includes software developed by UUNET Technologies, Inc.
4. The name of UUNET Technologies (UUNET) may not be used to endorse or promote products derived from this software without specific prior written permission.
<ftp://ftp.isc.org/pub/pgpcontrol/> is where the most recent versions of signcontrol and pgpverify live, along with PGP public keys used for hierarchy administration.
|INN 2.6.0||PGPVERIFY (1)||2015-09-12|