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authentication-plugins.md

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TESTING OF MULTIPLE AUTHENTICATION PLUG-INS

OpenVPN 2.x can support loading and authenticating users through multiple plug-ins at the same time. But it can only support a single plug-in doing deferred authentication. However, a plug-in supporting deferred authentication may be accompanied by other authentication plug-ins not doing deferred authentication.

This is a test script useful to test the various combinations and order of plug-in execution.

The configuration files are expected to be used from the root of the build directory.

To build the needed authentication plug-in, run:

 make -C sample/sample-plugins

Test configs

  • Client config

    verb 4
dev tun
client
remote x.x.x.x
ca sample/sample-keys/ca.crt
cert sample/sample-keys/client.crt
key sample/sample-keys/client.key
auth-user-pass

  • Base server config (base-server.conf)

    verb 4
dev tun
server 10.8.0.0 255.255.255.0
dh sample/sample-keys/dh2048.pem
ca sample/sample-keys/ca.crt
cert sample/sample-keys/server.crt
key sample/sample-keys/server.key

Test cases

Test: sanity-1

This tests the basic authentication with an instant answer.

 config base-server.conf
 plugin multi-auth.so S1.1 0 foo bar

Expected results

  • Username/password foo/bar: PASS
  • Anything else: FAIL

Test: sanity-2

This is similar to sanity-1, but does the authentication through two plug-ins providing an instant reply.

 config base-server.conf
 plugin multi-auth.so S2.1 0 foo bar
 plugin multi-auth.so S2.2 0 foo bar

Expected results

  • Username/password foo/bar: PASS
  • Anything else: FAIL

Test: sanity-3

This is also similar to sanity-1, but uses deferred authentication with a 1 second delay on the response.

 plugin multi-auth.so S3.1 1000 foo bar

Expected results

  • Username/password foo/bar: PASS
  • Anything else: FAIL

Test: case-a

Runs two authentications, the first one deferred by 1 second and the second one providing an instant response.

 plugin multi-auth.so A.1 1000 foo bar
 plugin multi-auth.so A.2 0 foo bar

Expected results

  • Username/password foo/bar: PASS
  • Anything else: FAIL

Test: case-b

This is similar to case-a, but the instant authentication response is provided first before the deferred authentication.

 plugin multi-auth.so B.1 0 foo bar
 plugin multi-auth.so B.2 1000 test pass

Expected results

  • Always FAIL
  • This test should never pass, as each plug-in expects different usernames and passwords.

Test: case-c

This is similar to the two prior tests, but the authentication result is returned instantly in both steps.

 plugin multi-auth.so C.1 0 foo bar
 plugin multi-auth.so C.2 0 foo2 bar2

Expected results

  • Always FAIL
  • This test should never pass, as each plug-in expects different usernames and passwords.

Test: case-d

This is similar to the case-b test, but the order of deferred and instant response is reversed.

plugin ./multi-auth.so D.1 2000 test pass
plugin ./multi-auth.so D.2 0 foo bar

Expected results

  • Always FAIL
  • This test should never pass, as each plug-in expects different usernames and passwords.

Test: case-e

This test case will run two deferred authentication plug-ins. This is not supported by OpenVPN, and should therefore fail instantly.

plugin ./multi-auth.so E1 1000 test1 pass1
plugin ./multi-auth.so E2 2000 test2 pass2

Expected results

  • The OpenVPN server process should stop running
  • An error about multiple deferred plug-ins being configured should be seen in the server log.