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feat(policies): load and evaluate remote policies on attestation operations #1220
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,121 @@ | ||
| // | ||
| // Copyright 2024 The Chainloop Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package policies | ||
|
|
||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "path/filepath" | ||
| "strings" | ||
| "sync" | ||
|
|
||
| pb "github.com/chainloop-dev/chainloop/app/controlplane/api/controlplane/v1" | ||
| v1 "github.com/chainloop-dev/chainloop/app/controlplane/api/workflowcontract/v1" | ||
| "github.com/chainloop-dev/chainloop/pkg/attestation/crafter/materials" | ||
| "github.com/sigstore/cosign/v2/pkg/blob" | ||
| "google.golang.org/protobuf/encoding/protojson" | ||
| ) | ||
|
|
||
| // Loader defines the interface for policy loaders from contract attachments | ||
| type Loader interface { | ||
| Load(context.Context, *v1.PolicyAttachment) (*v1.Policy, error) | ||
| } | ||
|
|
||
| // EmbeddedLoader returns embedded policies | ||
| type EmbeddedLoader struct{} | ||
|
|
||
| func (e *EmbeddedLoader) Load(_ context.Context, attachment *v1.PolicyAttachment) (*v1.Policy, error) { | ||
| return attachment.GetEmbedded(), nil | ||
| } | ||
|
|
||
| // URLLoader loader loads policies from filesystem and HTTPS references | ||
| type URLLoader struct{} | ||
|
|
||
| func (l *URLLoader) Load(_ context.Context, attachment *v1.PolicyAttachment) (*v1.Policy, error) { | ||
| reference := attachment.GetRef() | ||
|
|
||
| // look for the referenced policy spec (note: loading by `name` is not supported yet) | ||
| // this method understands env, http and https schemes, and defaults to file system. | ||
| rawData, err := blob.LoadFileOrURL(reference) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("loading policy spec: %w", err) | ||
| } | ||
|
|
||
| jsonContent, err := materials.LoadJSONBytes(rawData, filepath.Ext(reference)) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("loading policy spec: %w", err) | ||
| } | ||
|
|
||
| var spec v1.Policy | ||
| if err := protojson.Unmarshal(jsonContent, &spec); err != nil { | ||
| return nil, fmt.Errorf("unmarshalling policy spec: %w", err) | ||
| } | ||
| return &spec, nil | ||
| } | ||
|
|
||
| const chainloopScheme = "chainloop" | ||
|
|
||
| // ChainloopLoader loads policies referenced with chainloop://provider/name URLs | ||
| type ChainloopLoader struct { | ||
| Client pb.AttestationServiceClient | ||
|
|
||
| cacheMutex sync.Mutex | ||
| } | ||
|
|
||
| var remotePolicyCache = make(map[string]*v1.Policy) | ||
|
|
||
| func NewChainloopLoader(client pb.AttestationServiceClient) *ChainloopLoader { | ||
| return &ChainloopLoader{Client: client} | ||
| } | ||
|
|
||
| func (c *ChainloopLoader) Load(ctx context.Context, attachment *v1.PolicyAttachment) (*v1.Policy, error) { | ||
| ref := attachment.GetRef() | ||
|
|
||
| c.cacheMutex.Lock() | ||
| defer c.cacheMutex.Unlock() | ||
|
|
||
| if remotePolicyCache[ref] != nil { | ||
| return remotePolicyCache[ref], nil | ||
| } | ||
|
|
||
| parts := strings.SplitN(ref, "://", 2) | ||
| if len(parts) != 2 || parts[0] != chainloopScheme { | ||
| return nil, fmt.Errorf("invalid policy reference %q", ref) | ||
| } | ||
|
|
||
| pn := strings.SplitN(parts[1], "/", 2) | ||
| var ( | ||
| name = pn[0] | ||
| provider string | ||
| ) | ||
| if len(pn) == 2 { | ||
| provider = pn[0] | ||
| name = pn[1] | ||
| } | ||
|
|
||
| resp, err := c.Client.GetPolicy(ctx, &pb.AttestationServiceGetPolicyRequest{ | ||
| Provider: provider, | ||
| PolicyName: name, | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("loading policy: %w", err) | ||
| } | ||
|
|
||
| // cache result | ||
| remotePolicyCache[ref] = resp.GetPolicy() | ||
|
|
||
| return resp.GetPolicy(), nil | ||
| } | ||
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