Emilia Kasper 453dfd8d5e New SSL test framework

Currently, SSL tests are configured via command-line switches to
ssltest.c. This results in a lot of duplication between ssltest.c and
apps, and a complex setup. ssltest.c is also simply old and needs
maintenance.

Instead, we already have a way to configure SSL servers and clients, so
we leverage that. SSL tests can now be configured from a configuration
file. Test servers and clients are configured using the standard
ssl_conf module. Additional test settings are configured via a test
configuration.

Moreover, since the CONF language involves unnecessary boilerplate, the
test conf itself is generated from a shorter Perl syntax.

The generated testcase files are checked in to the repo to make
it easier to verify that the intended test cases are in fact run; and to
simplify debugging failures.

To demonstrate the approach, min/max protocol tests are converted to the
new format. This change also fixes MinProtocol and MaxProtocol
handling. It was previously requested that an SSL_CTX have both the
server and client flags set for these commands; this clearly can never work.

Guide to this PR:
 - test/ssl_test.c - test framework
 - test/ssl_test_ctx.* - test configuration structure
 - test/handshake_helper.* - new SSL test handshaking code
 - test/ssl-tests/ - test configurations
 - test/generate_ssl_tests.pl - script for generating CONF-style test
   configurations from perl inputs

Reviewed-by: Richard Levitte <levitte@openssl.org>

2016-04-05 13:44:46 +02:00

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SSL tests

SSL testcases are configured in the ssl-tests directory.

Each ssl_*.conf.in file contains a number of test configurations. These files are used to generate testcases in the OpenSSL CONF format.

The precise test output can be dependent on the library configuration. The test harness generates the output files on the fly.

However, for verification, we also include checked-in configuration outputs corresponding to the default configuration. These testcases live in test/ssl-tests/*.conf files. Therefore, whenever you're adding or updating a generated test, you should run

$ ./config
$ cd test
$ TOP=.. perl -I testlib/ generate_ssl_tests.pl ssl-tests/my.conf.in \
  > ssl-tests/my.conf

where my.conf.in is your test input file.

For example, to generate the test cases in ssl-tests/01-simple.conf.in, do

$ TOP=.. perl generate_ssl_tests.pl ssl-tests/01-simple.conf.in > ssl-tests/01-simple.conf

For more details, see ssl-tests/01-simple.conf.in for an example.

Configuring the test

First, give your test a name. The names do not have to be unique.

An example test input looks like this:

    {
        name => "test-default",
        server => { "CipherString" => "DEFAULT" },
        client => { "CipherString" => "DEFAULT" },
        test   => { "ExpectedResult" => "Success" },
    }

The test section supports the following options:

ExpectedResult - expected handshake outcome. One of
- Success - handshake success
- ServerFail - serverside handshake failure
- ClientFail - clientside handshake failure
- InternalError - some other error
ClientAlert, ServerAlert - expected alert. See ssl_test_ctx.c for known values.
Protocol - expected negotiated protocol. One of SSLv3, TLSv1, TLSv1.1, TLSv1.2.

Configuring the client and server

The client and server configurations can be any valid SSL_CTX configurations. For details, see the manpages for SSL_CONF_cmd.

Give your configurations as a dictionary of CONF commands, e.g.

server => {
    "CipherString" => "DEFAULT",
    "MinProtocol" => "TLSv1",
}

Default server and client configurations

The default server certificate and CA files are added to the configurations automatically. Server certificate verification is requested by default.

You can override these options by redefining them:

client => {
    "VerifyCAFile" => "/path/to/custom/file"
}

or by deleting them

client => {
    "VerifyCAFile" => undef
}

Adding a test to the test harness

Add your configuration file to test/recipes/80-test_ssl_new.t.

Running the tests with the test harness

HARNESS_VERBOSE=yes make TESTS=test_ssl_new test

Running a test manually

These steps are only needed during development. End users should run make test or follow the instructions above to run the SSL test suite.

To run an SSL test manually from the command line, the TEST_CERTS_DIR environment variable to point to the location of the certs. E.g., from the root OpenSSL directory, do

$ TEST_CERTS_DIR=test/certs test/ssl_test test/ssl-tests/01-simple.conf

or for shared builds

$ TEST_CERTS_DIR=test/certs util/shlib_wrap.sh test/ssl_test \
  test/ssl-tests/01-simple.conf

Note that the test expectations sometimes depend on the Configure settings. For example, the negotiated protocol depends on the set of available (enabled) protocols: a build with enable-ssl3 has different test expectations than a build with no-ssl3.

The Perl test harness automatically generates expected outputs, so users who just run make test do not need any extra steps.

However, when running a test manually, keep in mind that the repository version of the generated test/ssl-tests/*.conf correspond to expected outputs in with the default Configure options. To run ssl_test manually from the command line in a build with a different configuration, you may need to generate the right *.conf file from the *.conf.in input first.

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