74 lines
2.9 KiB
Markdown
74 lines
2.9 KiB
Markdown
# Rule files
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The format of a rule file, and the default file the image ships. "Rule files" in
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[`SPEC.md`](../SPEC.md) says how the files are read, watched and mounted, and
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what each action leads to.
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## The format
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A rule is a line of four fields separated by spaces or tabs: an id, a target, an
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action and a regex. The regex runs to the end of the line. Blank lines and lines
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starting with `#` are ignored.
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```
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# id target action regex
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env-file path ban (?i)^/\.env(\.[a-z]+)?$
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scanner-agent user_agent ban (?i)\b(sqlmap|nikto|nuclei|wpscan)\b
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```
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- The id is letters, digits, `-` and `_`, unique across all files. The log line,
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the metrics, the alerts and a ban's notes name the rule by it.
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- The target is what the regex is matched against:
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- `path`: the path without the query;
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- `uri`: the path and the query together;
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- `query`: the query as sent;
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- `method`, `host`, `user_agent` and `referer`;
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- `header:<Name>`: any one request header but `Host` and
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`Transfer-Encoding`.
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- The action is `log`, `block` or `ban`.
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- The regex is in Go's syntax, RE2. It matches anywhere in the target unless
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anchored with `^` and `$`. `(?i)` at its front makes it ignore case.
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## The default file
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The image ships one file, `share/rules.d/00-default.rules`, installed as
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`/etc/sww/rules.d/00-default.rules`:
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```
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# 00-default.rules: probes no real visitor sends, anchored at the site root
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# id target action regex
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env-file path ban (?i)^/\.env(\.[a-z]+)?$
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vcs-dir path ban (?i)^/\.(git|svn|hg|bzr)(/|$)
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secrets-dir path ban (?i)^/\.(aws|ssh|docker|kube)/
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secret-file path ban (?i)^/\.(htpasswd|htaccess|npmrc|netrc|pgpass|git-credentials|bash_history|DS_Store)$
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editor-dir path ban (?i)^/\.(vscode|idea)/
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backup-file path ban (?i)^/[^/]+\.(php(\.[a-z0-9]+|~)|sql(\.[a-z0-9]+)?)$
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log-file path ban (?i)^/(debug|error|access)\.log$
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compose-file path ban (?i)^/(docker-)?compose\.ya?ml$
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php-shell path ban (?i)^/(shell|c99|r57|wso|alfa)\.php$
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scanner-agent user_agent ban (?i)\b(sqlmap|nikto|nuclei|masscan|zgrab|wpscan)\b
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path-traversal uri block (\.\./){2,}
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empty-agent user_agent log ^$
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```
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## A file of your own
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`discriminator` reads the rule files in its own container. Rules of your own go
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in a file named to sort after the default, such as `50-site.rules`:
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```
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# 50-site.rules: WordPress probes, which this site never serves
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wp-probe path ban (?i)^/(wp-login\.php|xmlrpc\.php|wp-admin/)
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```
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A `Dockerfile` built on the `smallwebwaf` image, for `discriminator` to run
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from, adds it:
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```dockerfile
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COPY 50-site.rules /etc/sww/rules.d/50-site.rules
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```
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Or mount it there. A `path` rule applies on every site behind that
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`discriminator`.
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