@hackage cpsa3.6.9

CPSA: Crptographic Protocol Shapes Analyzer Version 3

The Cryptographic Protocol Shapes Analyzer (CPSA), is a software tool designed to assist in the design and analysis of cryptographic protocols. A cryptographic protocol is a specific pattern of interaction between principals. TLS and IKE are some examples of well-known cryptographic protocols.

CPSA attempts to enumerate all essentially different executions possible for a cryptographic protocol. We call them the shapes of the protocol. Many naturally occurring protocols have only finitely many, indeed very few shapes. Authentication and secrecy properties are easy to determine from them, as are attacks and anomalies, and an auxiliary tool reads off strongest authentication and secrecy goals from the shapes.

For each input problem, the CPSA program is given some initial behavior, and it discovers what shapes are compatible with it. Normally, the initial behavior is from the point of view of one participant. The analysis reveals what the other participants must have done, given the participant's view.

CPSA version 3 features support for Diffie-Hellman and state. The manual in <doc/cpsamanual.pdf> provides a comprehensive description of the program.

CPSA: Cryptographic Protocol Shapes Analyzer

This program has been built and tested using Haskell Platform. It is available from http://haskell.org or from an operating system specific source. The name of the Linux package is usually haskell-platform.

If the Internet is available, install CPSA with:

$ cabal update $ cabal install cpsa

Find the documentation directory by typing "cpsa -h" in a command shell, and view index.html in a browser.

INSTALLING FROM A TARBALL

Build and install with:

$ cabal build $ cabal install : To find the directory containing documentation and samples, type: $ cpsa4 -h

QUICK START (Linux)

: To analyze a protocol you have put in prob.scm type: $ cpsa -o prob.txt prob.scm $ cpsagraph -o prob.xhtml prob.txt $ firefox -remote "openFile(pwd/prob.xhtml)"

QUICK START (Mac)

: To analyze a protocol you have put in prob.scm type: $ cpsa -o prob.txt prob.scm $ cpsagraph -o prob.xhtml prob.txt $ open prob.xhtml

QUICK START (Windows)

With Cygwin or MinGW, the installation is similar to the Linux install. The software has been tested on a Windows system on which neither MinGW or Cygwin has been installed. Install Haskell Platform Core and then run:

C:...> cabal update C:...> cabal install parallel C:...> cabal build C:...> cabal install

Documentation and samples are in the directory given by C:...> cpsa -h

The installed programs can be run from the command prompt or via a batch file. Alternatively, copy doc/Make.hs into the directory containing your CPSA problem statements, and load it into a Haskell interpreter. Read the source for usage instructions.

MAKEFILE

To start your own project, create a fresh directory and then type:

$ cpsainit

This will create a Makefile that automates the analysis process. For Windows, it will also create Make4.hs, a cpsa build script written in Haskell.

PARALLELISM

CPSA is built so it can make use of multiple processors. To make use of more than one processor, start CPSA with the -N runtime flag, as in "+RTS -N -RTS". The GHC documentation describes the -N option in detail.

TEST SUITE

Cabal currently fails to preserve permissions correctly. To fix this problem, type:

$ /bin/sh fixperms

: To run the test suite type: $ ./cpsatst

Tests with the .scm extension and .prot extension are expected to complete without error, tests with the .lsp extension are expected to fail, and tests with the .lisp extension are not run. New users should read tst/README, and then browse the files it suggests while reading CPSA documentation.

Don't develop your protocols in the tst directory. The script is optimized for testing the cpsa program, not analyzing protocols.

ADDITIONAL PROGRAMS

The src directory of the source distributions includes programs written in Scheme, Prolog, Elisp, and OCaml for performing tasks. Use them as templates for your special purpose CPSA analysis and transformation needs. Also, when given the --json option, the CPSA pretty printer cpsapp will transform CPSA S-expressions into JavaScript Object Notation (JSON).

On Linux, the GHC runtime can request so much memory that thrashing results. The script in src/ghcmemlimit sets an environment variable that limits memory to the amount of free and reclaimable memory on your machine.

KNOWN BUGS

Variable separation in generalization fails to separate variables in terms of the form (ltk a a).