Check it's an SSL request before dereferencing the ssl field of a connection

Closes #26

See merge request storm2/ngx_http_voms_module!15

fix issue #26

Note that This test is always successful because, for some reason
(a bug?) the error.log as seen in Test::Nginx doesn't contain the
entries for the master process, although they are evailable in
the actual file. As a consequence the no_error_log check is
always satisfied, even if the segmentation fault were present

Actual fix for issue-23

See merge request storm2/ngx_http_voms_module!14

And related test.

Do not return CA certificates as the EEC

See merge request storm2/ngx_http_voms_module!13

When the client certificate chain contains a CA certificate, the
ngx_http_voms_module returns that one as the EEC.

This fix should resolve that issue.

Issue: https://baltig.infn.it/storm2/ngx_http_voms_module/issues/23

[ngx-voms] configure openssl to accept proxy certs

Closes #19

See merge request storm2/ngx_http_voms_module!12

fix issue #19

avoid dangling pointer (to a destroyed temporary)

Closes #20

See merge request storm2/ngx_http_voms_module!11

fix issue #20

* issue-16:
  initialize result
  review
  reorder code
  format

* issue-16:
  Tentative support for ssl_client_ee_cert

cache and clean the VOMS AC only once per connection

Closes #15

See merge request storm2/ngx_http_voms_module!10

ngx-voms docker image

See merge request storm2/ngx_http_voms_module!9

they cover mainly nginx and openssl issues

add support for ssl_client_ee_s_dn and ssl_client_ee_i_dn

Closes #14

See merge request storm2/ngx_http_voms_module!8

This commit introduces the ngx-voms docker image, and modifies the CI
configuration to build the image.

Issue 5 - Write tests to cover all VOMS attributes exposed by NGINX VOMS module

See merge request storm2/ngx_http_voms_module!5