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Co-authored-by: Nick Kane <nkane@testifysec.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,122 @@ | ||
| // Copyright 2024 The Witness Contributors | ||
| // | ||
| // 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 vex | ||
|
|
||
| import ( | ||
| "encoding/json" | ||
| "fmt" | ||
| "io" | ||
| "os" | ||
|
|
||
| "github.com/in-toto/go-witness/attestation" | ||
| "github.com/in-toto/go-witness/cryptoutil" | ||
| "github.com/in-toto/go-witness/log" | ||
| "github.com/invopop/jsonschema" | ||
| vex "github.com/openvex/go-vex/pkg/vex" | ||
| ) | ||
|
|
||
| const ( | ||
| Name = "vex" | ||
| Type = "https://openvex.dev/ns" | ||
| RunType = attestation.PostProductRunType | ||
| ) | ||
|
|
||
| // This is a hacky way to create a compile time error in case the attestor | ||
| // doesn't implement the expected interfaces. | ||
| var ( | ||
| _ attestation.Attestor = &Attestor{} | ||
| ) | ||
|
|
||
| func init() { | ||
| attestation.RegisterAttestation(Name, Type, RunType, func() attestation.Attestor { | ||
| return New() | ||
| }) | ||
| } | ||
|
|
||
| type Attestor struct { | ||
| VEXDocument vex.VEX `json:"vexDocument"` | ||
| ReportFile string `json:"reportFileName,omitempty"` | ||
| ReportDigestSet cryptoutil.DigestSet `json:"reportDigestSet,omitempty"` | ||
| } | ||
|
|
||
| func New() *Attestor { | ||
| return &Attestor{} | ||
| } | ||
|
|
||
| func (a *Attestor) Name() string { | ||
| return Name | ||
| } | ||
|
|
||
| func (a *Attestor) Type() string { | ||
| return Type | ||
| } | ||
|
|
||
| func (a *Attestor) RunType() attestation.RunType { | ||
| return RunType | ||
| } | ||
|
|
||
| func (a *Attestor) Schema() *jsonschema.Schema { | ||
| return jsonschema.Reflect(&a) | ||
| } | ||
|
|
||
| func (a *Attestor) Attest(ctx *attestation.AttestationContext) error { | ||
| if err := a.getCandidate(ctx); err != nil { | ||
| log.Debugf("(attestation/vex) error getting candidate: %w", err) | ||
| return err | ||
| } | ||
|
|
||
| return nil | ||
| } | ||
|
|
||
| func (a *Attestor) getCandidate(ctx *attestation.AttestationContext) error { | ||
| products := ctx.Products() | ||
|
|
||
| if len(products) == 0 { | ||
| return fmt.Errorf("no products to attest") | ||
| } | ||
|
|
||
| for path, product := range products { | ||
| newDigestSet, err := cryptoutil.CalculateDigestSetFromFile(path, ctx.Hashes()) | ||
| if newDigestSet == nil || err != nil { | ||
| return fmt.Errorf("error calculating digest set from file: %s", path) | ||
| } | ||
|
|
||
| if !newDigestSet.Equal(product.Digest) { | ||
| return fmt.Errorf("integrity error: product digest set does not match candidate digest set") | ||
| } | ||
|
|
||
| f, err := os.Open(path) | ||
| if err != nil { | ||
| return fmt.Errorf("error opening file: %s", path) | ||
| } | ||
|
|
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| reportBytes, err := io.ReadAll(f) | ||
| if err != nil { | ||
| return fmt.Errorf("error reading file: %s", path) | ||
| } | ||
|
|
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| // Check to see if we can unmarshal into VEX type | ||
| if err := json.Unmarshal(reportBytes, &a.VEXDocument); err != nil { | ||
| log.Debugf("(attestation/vex) error unmarshaling VEX document: %w", err) | ||
| continue | ||
| } | ||
|
|
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| a.ReportFile = path | ||
| a.ReportDigestSet = product.Digest | ||
|
|
||
| return nil | ||
| } | ||
| return fmt.Errorf("no VEX file found") | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| // Copyright 2024 The Witness Contributors | ||
| // | ||
| // 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 vex | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "encoding/json" | ||
| "testing" | ||
| "time" | ||
|
|
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| "github.com/in-toto/go-witness/attestation" | ||
| vex "github.com/openvex/go-vex/pkg/vex" | ||
| ) | ||
|
|
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| // NOTE(nick): examples https://github.com/openvex/vexctl/tree/main/examples/openvex | ||
|
|
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| const vexDocumentExpected = `{ | ||
| "vexDocument": { | ||
| "@context": "https://openvex.dev/ns/v0.2.0", | ||
| "@id": "https://openvex.dev/docs/public/vex-0f3be8817faafa24e4bfb3d17eaf619efb1fe54923b9c42c57b156a936b91431", | ||
| "author": "John Doe", | ||
| "role": "Senior Trusted Vex Issuer", | ||
| "timestamp": "1970-01-01T00:00:00Z", | ||
| "version": 1, | ||
| "statements": [ | ||
| { | ||
| "vulnerability": { | ||
| "name": "CVE-1234-5678" | ||
| }, | ||
| "products": [ | ||
| { | ||
| "@id": "pkg:apk/wolfi/bash@1.0.0" | ||
| } | ||
| ], | ||
| "status": "fixed" | ||
| } | ||
| ] | ||
| } | ||
| }` | ||
|
|
||
| func TestAttest(t *testing.T) { | ||
| vexAttestor := New() | ||
| vexAttestor.VEXDocument.Context = "https://openvex.dev/ns/v0.2.0" | ||
| vexAttestor.VEXDocument.ID = "https://openvex.dev/docs/public/vex-0f3be8817faafa24e4bfb3d17eaf619efb1fe54923b9c42c57b156a936b91431" | ||
| vexAttestor.VEXDocument.Author = "John Doe" | ||
| vexAttestor.VEXDocument.AuthorRole = "Senior Trusted Vex Issuer" | ||
| vexAttestor.VEXDocument.Version = 1 | ||
| time := time.Date(1970, 1, 1, 0, 0, 0, 0, time.Now().UTC().Location()) | ||
| vexAttestor.VEXDocument.Timestamp = &time | ||
| vexAttestor.VEXDocument.Statements = []vex.Statement{ | ||
| { | ||
| Vulnerability: vex.Vulnerability{ | ||
| Name: "CVE-1234-5678", | ||
| }, | ||
| Products: []vex.Product{ | ||
| { | ||
| Component: vex.Component{ | ||
| ID: "pkg:apk/wolfi/bash@1.0.0", | ||
| }, | ||
| }, | ||
| }, | ||
| Status: vex.StatusFixed, | ||
| }, | ||
| } | ||
|
|
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| attestorCollection := []attestation.Attestor{vexAttestor} | ||
| ctx, err := attestation.NewContext("test", append(attestorCollection, vexAttestor)) | ||
| if err != nil { | ||
| t.Errorf("error creating attestation context: %s", err) | ||
| } | ||
| err = ctx.RunAttestors() | ||
| if err != nil { | ||
| t.Errorf("error attesting: %s", err.Error()) | ||
| } | ||
|
|
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| vexDocJSON, err := json.MarshalIndent(vexAttestor, "", " ") | ||
| if err != nil { | ||
| t.Errorf("unexpected error: %s", err) | ||
| } | ||
|
|
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| expectedJSON := []byte(vexDocumentExpected) | ||
|
|
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| if !bytes.Equal(vexDocJSON, expectedJSON) { | ||
| t.Errorf("expected \n%s\n, got \n%s\n", expectedJSON, vexDocJSON) | ||
| } | ||
| } |
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