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astvalue.go
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210 lines (190 loc) · 4.59 KB
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package rbac
import (
"github.com/open-policy-agent/opa/ast"
"golang.org/x/xerrors"
)
// regoInputValue returns a rego input value for the given subject, action, and
// object. This rego input is already parsed and can be used directly in a
// rego query.
func regoInputValue(subject Subject, action Action, object Object) (ast.Value, error) {
regoSubj, err := subject.regoValue()
if err != nil {
return nil, xerrors.Errorf("subject: %w", err)
}
s := [2]*ast.Term{
ast.StringTerm("subject"),
ast.NewTerm(regoSubj),
}
a := [2]*ast.Term{
ast.StringTerm("action"),
ast.StringTerm(string(action)),
}
o := [2]*ast.Term{
ast.StringTerm("object"),
ast.NewTerm(object.regoValue()),
}
input := ast.NewObject(s, a, o)
return input, nil
}
// regoPartialInputValue is the same as regoInputValue but only includes the
// object type. This is for partial evaluations.
func regoPartialInputValue(subject Subject, action Action, objectType string) (ast.Value, error) {
regoSubj, err := subject.regoValue()
if err != nil {
return nil, xerrors.Errorf("subject: %w", err)
}
s := [2]*ast.Term{
ast.StringTerm("subject"),
ast.NewTerm(regoSubj),
}
a := [2]*ast.Term{
ast.StringTerm("action"),
ast.StringTerm(string(action)),
}
o := [2]*ast.Term{
ast.StringTerm("object"),
ast.NewTerm(ast.NewObject(
[2]*ast.Term{
ast.StringTerm("type"),
ast.StringTerm(objectType),
}),
),
}
input := ast.NewObject(s, a, o)
return input, nil
}
// regoValue returns the ast.Object representation of the subject.
func (s Subject) regoValue() (ast.Value, error) {
subjRoles, err := s.Roles.Expand()
if err != nil {
return nil, xerrors.Errorf("expand roles: %w", err)
}
subjScope, err := s.Scope.Expand()
if err != nil {
return nil, xerrors.Errorf("expand scope: %w", err)
}
subj := ast.NewObject(
[2]*ast.Term{
ast.StringTerm("id"),
ast.StringTerm(s.ID),
},
[2]*ast.Term{
ast.StringTerm("roles"),
ast.NewTerm(regoSlice(subjRoles)),
},
[2]*ast.Term{
ast.StringTerm("scope"),
ast.NewTerm(subjScope.regoValue()),
},
[2]*ast.Term{
ast.StringTerm("groups"),
ast.NewTerm(regoSliceString(s.Groups...)),
},
)
return subj, nil
}
func (z Object) regoValue() ast.Value {
userACL := ast.NewObject()
for k, v := range z.ACLUserList {
userACL.Insert(ast.StringTerm(k), ast.NewTerm(regoSlice(v)))
}
grpACL := ast.NewObject()
for k, v := range z.ACLGroupList {
grpACL.Insert(ast.StringTerm(k), ast.NewTerm(regoSlice(v)))
}
return ast.NewObject(
[2]*ast.Term{
ast.StringTerm("id"),
ast.StringTerm(z.ID),
},
[2]*ast.Term{
ast.StringTerm("owner"),
ast.StringTerm(z.Owner),
},
[2]*ast.Term{
ast.StringTerm("org_owner"),
ast.StringTerm(z.OrgID),
},
[2]*ast.Term{
ast.StringTerm("type"),
ast.StringTerm(z.Type),
},
[2]*ast.Term{
ast.StringTerm("acl_user_list"),
ast.NewTerm(userACL),
},
[2]*ast.Term{
ast.StringTerm("acl_group_list"),
ast.NewTerm(grpACL),
},
)
}
func (role Role) regoValue() ast.Value {
orgMap := ast.NewObject()
for k, p := range role.Org {
orgMap.Insert(ast.StringTerm(k), ast.NewTerm(regoSlice(p)))
}
return ast.NewObject(
[2]*ast.Term{
ast.StringTerm("site"),
ast.NewTerm(regoSlice(role.Site)),
},
[2]*ast.Term{
ast.StringTerm("org"),
ast.NewTerm(orgMap),
},
[2]*ast.Term{
ast.StringTerm("user"),
ast.NewTerm(regoSlice(role.User)),
},
)
}
func (s Scope) regoValue() ast.Value {
r, ok := s.Role.regoValue().(ast.Object)
if !ok {
panic("developer error: role is not an object")
}
r.Insert(
ast.StringTerm("allow_list"),
ast.NewTerm(regoSliceString(s.AllowIDList...)),
)
return r
}
func (perm Permission) regoValue() ast.Value {
return ast.NewObject(
[2]*ast.Term{
ast.StringTerm("negate"),
ast.BooleanTerm(perm.Negate),
},
[2]*ast.Term{
ast.StringTerm("resource_type"),
ast.StringTerm(perm.ResourceType),
},
[2]*ast.Term{
ast.StringTerm("action"),
ast.StringTerm(string(perm.Action)),
},
)
}
func (act Action) regoValue() ast.Value {
return ast.StringTerm(string(act)).Value
}
type regoValue interface {
regoValue() ast.Value
}
// regoSlice returns the ast.Array representation of the slice.
// The slice must contain only types that implement the regoValue interface.
func regoSlice[T regoValue](slice []T) *ast.Array {
terms := make([]*ast.Term, len(slice))
for i, v := range slice {
terms[i] = ast.NewTerm(v.regoValue())
}
return ast.NewArray(terms...)
}
func regoSliceString(slice ...string) *ast.Array {
terms := make([]*ast.Term, len(slice))
for i, v := range slice {
terms[i] = ast.StringTerm(v)
}
return ast.NewArray(terms...)
}