owasp-modsecurity / owasp-modsecurity/ModSecurity-nginx
IncludeOptional error "modsecurity_rules_file" directive Rules error
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Description
We have installed nginx-extras, libnginx-mod-http-modsecurity/stable,now 1.0.3-1+b2 and libnginx-mod-http-modsecurity/stable,now 1.0.3-1+b2.
Enabling (uncommenting) the ModSecurity lines produces the following error:
root@xxxxx:~# nginx -t
2025/01/27 09:43:06 [emerg] 80509#80509: "modsecurity_rules_file" directive Rules error. File: /etc/nginx/modsecurity_includes.conf. Line: 8. Column: 81. Invalid input: IncludeOptional /etc/modsecurity/crs/REQUEST-900-EXCLUSION-RULES-BEFORE-CRS.conf in /etc/nginx/sites-enabled/default.conf:26
nginx: configuration file /etc/nginx/nginx.conf test failed
I have tested that if I change IncludeOptional to just Include it works.
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Research direction
Reproduce the failure with nginx -t after enabling the ModSecurity lines, starting with /etc/nginx/modsecurity_includes.conf line 8 and /etc/nginx/sites-enabled/default.conf line 26. Compare the behavior of IncludeOptional and Include, and trace the reported modsecurity_rules_file parsing path. Done means the configuration test handles the shown IncludeOptional directive correctly.
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Assessment
- Tech stack
- nginx
- Domain
- security
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100