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vmod_otp

Varnish OTP(HOTP/TOTP) module

Author:Shohei Tanaka(@xcir)
Date:2017-08-22
Version:51.2
Support Varnish Version:5.1.x
Manual section:3

SYNOPSIS

import otp;

DESCRIPTION

Generate one-time password(HOTP/TOTP) token.

ATTENTION

This vmod only works at a 64 bit environment. Time synchronization is required with ntp etc.

FUNCTIONS

hotp
Prototype
hotp(STRING b32_secret, INT count, INT digit=6, ENUM { md4, md5, sha1, sha256, sha512 } alg="sha1")
Return value
STRING
Description
Generate HOTP(RFC4226) token.
Example
if(req.http.x-example-otp != otp.hotp(
    b32_secret = "GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ", //base32 encoded secret value
    count      = 1,                                  //counter value
    digit      = 6,                                  //number of digits
    alg        = sha1                                //hash algorithm
)){
  return (synth(401));
}
totp
Prototype
totp(STRING b32_secret, INT step=30, INT digit=6, ENUM { md4, md5, sha1, sha256, sha512 } alg="sha1")
Return value
STRING
Description
Generate TOTP(RFC6238) token. Require time sync.(use ntp...)
Example
if(req.http.x-example-otp != otp.totp(
    b32_secret = "GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ", //base32 encoded secret value
    step       = 30,                                 //time step in seconds
    digit      = 6,                                  //number of digits
    alg        = sha1                                //hash algorithm
)){
  return (synth(401));
}
totp_settime
Prototype
totp_settime(STRING b32_secret, REAL time, INT step=30, INT digit=6, ENUM { md4, md5, sha1, sha256, sha512 } alg="sha1")
Return value
STRING
Description
Generate TOTP(RFC6238) token. This function used for tests.
Example
if(req.http.x-example-otp != otp.totp(
    b32_secret = "GEZDGNBVGY3TQOJQGEZDGNBVGY3TQOJQ", //base32 encoded secret value
    time       = 1502380366.0,                       //unixtime
    step       = 30,                                 //time step in seconds
    digit      = 6,                                  //number of digits
    alg        = sha1                                //hash algorithm
)){
  return (synth(401));
}

INSTALLATION

The source tree is based on autotools to configure the building, and does also have the necessary bits in place to do functional unit tests using the varnishtest tool.

Building requires the Varnish header files and uses pkg-config to find the necessary paths.

Usage:

./autogen.sh
./configure

If you have installed Varnish to a non-standard directory, call autogen.sh and configure with PKG_CONFIG_PATH pointing to the appropriate path. For instance, when varnishd configure was called with --prefix=$PREFIX, use

export PKG_CONFIG_PATH=${PREFIX}/lib/pkgconfig
export ACLOCAL_PATH=${PREFIX}/share/aclocal

The module will inherit its prefix from Varnish, unless you specify a different --prefix when running the configure script for this module.

Make targets:

  • make - builds the vmod.
  • make install - installs your vmod.
  • make check - runs the unit tests in src/tests/*.vtc.
  • make distcheck - run check and prepare a tarball of the vmod.

If you build a dist tarball, you don't need any of the autotools or pkg-config. You can build the module simply by running:

./configure
make
Installation directories

By default, the vmod configure script installs the built vmod in the directory relevant to the prefix. The vmod installation directory can be overridden by passing the vmoddir variable to make install.

COMMON PROBLEMS

  • configure: error: Need varnish.m4 -- see README.rst

    Check whether PKG_CONFIG_PATH and ACLOCAL_PATH were set correctly before calling autogen.sh and configure

  • Incompatibilities with different Varnish Cache versions

    Make sure you build this vmod against its correspondent Varnish Cache version. For instance, to build against Varnish Cache 4.1, this vmod must be built from branch 4.1.