* feat(lib): implement request weight
Replaces #608
This is a big one and will be what makes Anubis a generic web
application firewall. This introduces the WEIGH option, allowing
administrators to have facets of request metadata add or remove
"weight", or the level of suspicion. This really makes Anubis weigh
the soul of requests.
Signed-off-by: Xe Iaso <me@xeiaso.net>
* fix(lib): maintain legacy challenge behavior
Signed-off-by: Xe Iaso <me@xeiaso.net>
* fix(lib): make weight have dedicated checkers for the hashes
Signed-off-by: Xe Iaso <me@xeiaso.net>
* feat(data): convert some rules over to weight points
Signed-off-by: Xe Iaso <me@xeiaso.net>
* docs: document request weight
Signed-off-by: Xe Iaso <me@xeiaso.net>
* fix(CHANGELOG): spelling error
Signed-off-by: Xe Iaso <me@xeiaso.net>
* chore: spelling
Signed-off-by: Xe Iaso <me@xeiaso.net>
* docs: fix links to challenge information
Signed-off-by: Xe Iaso <me@xeiaso.net>
* docs(policies): fix formatting
Signed-off-by: Xe Iaso <me@xeiaso.net>
* fix(config): make default weight adjustment 5
Signed-off-by: Xe Iaso <me@xeiaso.net>
---------
Signed-off-by: Xe Iaso <me@xeiaso.net>
* fix(expression): add validation for empty ExpressionOrList
Signed-off-by: Jason Cameron <git@jasoncameron.dev>
* fix(imports): block empty file imports with improved error checking logic
Signed-off-by: Jason Cameron <git@jasoncameron.dev>
* docs(expression): improve validation to error on empty CEL expressions
Signed-off-by: Jason Cameron <git@jasoncameron.dev>
---------
Signed-off-by: Jason Cameron <git@jasoncameron.dev>
* feat(lib/policy): add support for CEL checkers
This adds the ability for administrators to use Common Expression
Language[0] (CEL) for more advanced check logic than Anubis previously
offered.
These can be as simple as:
```yaml
- name: allow-api-routes
action: ALLOW
expression:
and:
- '!(method == "HEAD" || method == "GET")'
- path.startsWith("/api/")
```
or get as complicated as:
```yaml
- name: allow-git-clients
action: ALLOW
expression:
and:
- userAgent.startsWith("git/") || userAgent.contains("libgit") || userAgent.startsWith("go-git") || userAgent.startsWith("JGit/") || userAgent.startsWith("JGit-")
- >
"Git-Protocol" in headers && headers["Git-Protocol"] == "version=2"
```
Internally these are compiled and evaluated with cel-go[1]. This also
leaves room for extensibility should that be desired in the future. This
will intersect with #338 and eventually intersect with TLS fingerprints
as in #337.
[0]: https://cel.dev/
[1]: https://github.com/google/cel-go
Signed-off-by: Xe Iaso <me@xeiaso.net>
* feat(data/apps): add API route allow rule for non-HEAD/GET
Signed-off-by: Xe Iaso <me@xeiaso.net>
* docs: document expression syntax
Signed-off-by: Xe Iaso <me@xeiaso.net>
* fix: fixes in review
Signed-off-by: Xe Iaso <me@xeiaso.net>
---------
Signed-off-by: Xe Iaso <me@xeiaso.net>
