https://github.com/jpmens/dv

POC: Lightweight file "signing" and verification using DNSSEC
https://github.com/jpmens/dv

Last synced: 1 day ago
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POC: Lightweight file "signing" and verification using DNSSEC

• Host: GitHub
• URL: https://github.com/jpmens/dv
• Owner: jpmens
• Created: 2012-07-31T07:11:31.000Z (over 12 years ago)
• Default Branch: master
• Last Pushed: 2012-11-19T14:48:33.000Z (almost 12 years ago)
• Last Synced: 2024-10-15T00:26:18.654Z (22 days ago)
• Language: C
• Homepage: http://jpmens.net/2012/07/31/lightweight-file-signing-with-dns/
• Size: 113 KB
• Stars: 1
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# DV - Verify file hashes in the DNS

An experiment. [Read more](http://jpmens.net/2012/07/31/lightweight-file-signing-with-dns/).

## Examples

### Normal operation

	$ ./example reference.file

		filename....: reference.file

		sha1........: 557db03de997c86a4a028e1ebd3a1ceb225be238

		ttl.........: 70900

		rdata.......: reference.file

		reason......: NOERROR

	file `reference.file' is valid

### Modify input file

	$ echo h >> reference.file

	$ ./example reference.file

		filename....: reference.file

		sha1........: c9477886d6d694b1b6dc17bfa04e4d81af0a1d6d

		ttl.........: 0

		rdata.......: 

		reason......: NXDOMAIN

	file `reference.file' is NOT valid: NXDOMAIN

### Same data, different name

	$ cp reference.file reference.bad

	$ ./example reference.bad 

		filename....: reference.bad

		sha1........: 557db03de997c86a4a028e1ebd3a1ceb225be238

		ttl.........: 70856

		rdata.......: reference.file

		reason......: NOERROR

	file `reference.bad' signature-state BAD (githash in DNS but filename not in rdata)

### Modify program

	$ echo 'hello foo' >> example

	$ strings - example | tail -1

	hello foo

	$ ./example reference.file

	Program file ./example has been modified. ABORT

## Requires

* [ldns](http://www.nlnetlabs.nl/projects/ldns/)

## Credits

* Uses "SHA-1 in C", by Steve Reid (Public Domain)