feat(wazuh): Add JVM proxy configuration for Slack notifications

[grzegorzkoper]

Add JVM proxy settings to wazuh-indexer configuration to enable OpenSearch Dashboard Slack notifications when running behind a proxy. The configuration:

• Sets both HTTP and HTTPS proxy host and port from http_proxy_url
• Triggers wazuh-indexer restart when proxy settings change

http_proxy_url needs to be defined before running wazuh-manager.yml

[Alex-Welsh]

Great timing, I came across the same problem today. I've tried this patch but still get errors trying to trigger a test alert in the dashboard:

Which is the same error as trying to send a test alert with curl and no proxy.

[grzegorzkoper]

Great timing, I came across the same problem today. I've tried this patch but still get errors trying to trigger a test alert in the dashboard: Which is the same error as trying to send a test alert with curl and no proxy.

This looks like in your case you have a problem with resolving the name first ?
"hooks.slack.com : Name or service not known ? "

[Alex-Welsh]

This looks like in your case you have a problem with resolving the name first ? "hooks.slack.com : Name or service not known ? "

In my case, that's the error I get when the proxy isn't working e.g.

$  curl example.com --noproxy '*'
curl: (6) Could not resolve host: example.com

(works fine when proxy is in use)

[Alex-Welsh]

Templating works, just didn't work my case because DNS wasn't being proxied.

(For future reference, that was fixed by adding 3.68.124.95 hooks.slack.com to /etc/hosts)

[Alex-Welsh]

/cherry-pick stackhpc/2023.1