865d513e35
* 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>
62 lines
1.3 KiB
Go
62 lines
1.3 KiB
Go
package config
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import (
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"encoding/json"
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"errors"
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"slices"
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)
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var (
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ErrExpressionOrListMustBeStringOrObject = errors.New("config: this must be a string or an object")
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ErrExpressionEmpty = errors.New("config: this expression is empty")
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ErrExpressionCantHaveBoth = errors.New("config: expression block can't contain multiple expression types")
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)
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type ExpressionOrList struct {
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Expression string `json:"-"`
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All []string `json:"all"`
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Any []string `json:"any"`
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}
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func (eol ExpressionOrList) Equal(rhs *ExpressionOrList) bool {
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if eol.Expression != rhs.Expression {
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return false
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}
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if !slices.Equal(eol.All, rhs.All) {
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return false
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}
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if !slices.Equal(eol.Any, rhs.Any) {
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return false
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}
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return true
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}
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func (eol *ExpressionOrList) UnmarshalJSON(data []byte) error {
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switch string(data[0]) {
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case `"`: // string
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return json.Unmarshal(data, &eol.Expression)
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case "{": // object
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type RawExpressionOrList ExpressionOrList
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var val RawExpressionOrList
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if err := json.Unmarshal(data, &val); err != nil {
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return err
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}
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eol.All = val.All
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eol.Any = val.Any
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return nil
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}
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return ErrExpressionOrListMustBeStringOrObject
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}
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func (eol *ExpressionOrList) Valid() error {
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if len(eol.All) != 0 && len(eol.Any) != 0 {
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return ErrExpressionCantHaveBoth
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}
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return nil
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}
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