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slack service fails with error 500 if configured hook uses self-signed certificate

Summary

The execution of services fails with error 500 if the configured hook uses a self-signed ssl certificate.

The issue appears to be the exact same as Issue (https://gitlab.com/gitlab-org/gitlab-ce/issues/2681) for webhooks, which has already been solved by the "disable ssl verification" checkbox

Steps to reproduce

  • set up a mattermost server with self-signed ssl certificates
  • configure slack service with webhook pointing to set-up mattermost server
  • Save changes
  • Test settings

Expected behavior

  • Success message, stating that a request was sent to the url.
  • Something happening on mattermost

Actual behavior

  • Error 500, something went wrong on our end
  • Nothing happens on mattermost

Environment

System information System: Ubuntu 16.04 Current User: git Using RVM: no Ruby Version: 2.3.1p112 Gem Version: 2.6.6 Bundler Version:1.13.6 Rake Version: 10.5.0 Sidekiq Version:4.2.1

GitLab information Version: 8.13.6 Revision: 69cda014 Directory: /opt/gitlab/embedded/service/gitlab-rails DB Adapter: postgresql Using LDAP: yes Using Omniauth: no

GitLab Shell Version: 3.6.6 Repository storage paths:

  • default: /var/opt/gitlab/git-data/repositories Hooks: /opt/gitlab/embedded/service/gitlab-shell/hooks/ Git: /opt/gitlab/embedded/bin/git

mattermost: Latest stable build

Possible fixes