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//
// Copyright 2022 The Sigstore 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 policy
import (
"context"
"strings"
"testing"
)
const (
customAttestation = `
{
"_type": "https://in-toto.io/Statement/v0.1",
"predicateType": "https://cosign.sigstore.dev/attestation/v1",
"subject": [
{
"name": "registry.local:5000/policy-controller/demo",
"digest": {
"sha256": "416cc82c76114b1744ea58bcbf2f411a0f2de4b0456703bf1bb83d33656951bc"
}
}
],
"predicate": {
"Data": "foobar e2e test",
"Timestamp": "2022-04-20T18:17:19Z"
}
}`
vulnAttestation = `
{
"_type": "https://in-toto.io/Statement/v0.1",
"predicateType": "https://cosign.sigstore.dev/attestation/vuln/v1",
"subject": [
{
"name": "registry.local:5000/policy-controller/demo",
"digest": {
"sha256": "416cc82c76114b1744ea58bcbf2f411a0f2de4b0456703bf1bb83d33656951bc"
}
}
],
"predicate": {
"invocation": {
"parameters": null,
"uri": "invocation.example.com/cosign-testing",
"event_id": "",
"builder.id": ""
},
"scanner": {
"uri": "fakescanner.example.com/cosign-testing",
"version": "",
"db": {
"uri": "",
"version": ""
},
"result": null
},
"metadata": {
"scanStartedOn": "2022-04-12T00:00:00Z",
"scanFinishedOn": "2022-04-12T00:10:00Z"
}
}
}`
cipAttestation = "{\"authorityMatches\":{\"keyatt\":{\"signatures\":null,\"attestations\":{\"vuln-key\":[{\"subject\":\"PLACEHOLDER\",\"issuer\":\"PLACEHOLDER\"}]}},\"keysignature\":{\"signatures\":[{\"subject\":\"PLACEHOLDER\",\"issuer\":\"PLACEHOLDER\"}],\"attestations\":null},\"keylessatt\":{\"signatures\":null,\"attestations\":{\"custom-keyless\":[{\"subject\":\"PLACEHOLDER\",\"issuer\":\"PLACEHOLDER\"}]}}}}"
)
func TestEvalPolicy(t *testing.T) {
// TODO(vaikas): Consider moving the attestations/cue files into testdata
// directory.
tests := []struct {
name string
json string
policyType string
policyFile string
wantErr bool
wantErrSub string
wantWarnSub string
}{{
name: "custom attestation, mismatched predicateType",
json: customAttestation,
policyType: "cue",
policyFile: `predicateType: "https://cosign.sigstore.dev/attestation/vuln/v1"`,
wantErr: true,
wantErrSub: `conflicting values "https://cosign.sigstore.dev/attestation/v1" and "https://cosign.sigstore.dev/attestation/vuln/v1"`,
}, {
name: "custom attestation, predicateType and data checks out",
json: customAttestation,
policyType: "cue",
policyFile: `predicateType: "https://cosign.sigstore.dev/attestation/v1"
predicate: Data: "foobar e2e test"`,
}, {
name: "custom attestation, data mismatch",
json: customAttestation,
policyType: "cue",
policyFile: `predicateType: "https://cosign.sigstore.dev/attestation/v1"
predicate: Data: "invalid data here"`,
wantErr: true,
wantErrSub: `predicate.Data: conflicting values "foobar e2e test" and "invalid data here"`,
}, {
name: "vuln attestation, wrong invocation url",
json: vulnAttestation,
policyType: "cue",
policyFile: `predicateType: "https://cosign.sigstore.dev/attestation/vuln/v1"
predicate: invocation: uri: "invocation.example.com/wrong-url-here"`,
wantErr: true,
wantErrSub: `conflicting values "invocation.example.com/cosign-testing" and "invocation.example.com/wrong-url-here"`,
}, {
name: "vuln attestation, checks out",
json: vulnAttestation,
policyType: "cue",
policyFile: `predicateType: "https://cosign.sigstore.dev/attestation/vuln/v1"
predicate: invocation: uri: "invocation.example.com/cosign-testing"`,
}, {
name: "cluster image policy main policy, checks out",
json: cipAttestation,
policyType: "cue",
policyFile: `package sigstore
import "struct"
import "list"
authorityMatches: {
keyatt: {
attestations: struct.MaxFields(1) & struct.MinFields(1)
},
keysignature: {
signatures: list.MaxItems(1) & list.MinItems(1)
},
keylessatt: {
attestations: struct.MaxFields(1) & struct.MinFields(1)
},
keylesssignature: {
signatures: list.MaxItems(1) & list.MinItems(1)
}
}`,
}, {
name: "cluster image policy main policy, fails",
json: cipAttestation,
policyType: "cue",
wantErr: true,
wantErrSub: `failed evaluating cue policy for cluster image policy main policy, fails: failed to evaluate the policy with error: authorityMatches.keylessattMinAttestations: conflicting values 2 and "Error" (mismatched types int and string)`,
policyFile: `package sigstore
import "struct"
import "list"
authorityMatches: {
keyatt: {
attestations: struct.MaxFields(1) & struct.MinFields(1)
},
keysignature: {
signatures: list.MaxItems(1) & list.MinItems(1)
},
if( len(authorityMatches.keylessatt.attestations) < 2) {
keylessattMinAttestations: 2
keylessattMinAttestations: "Error"
},
keylesssignature: {
signatures: list.MaxItems(1) & list.MinItems(1)
}
}`}, {
name: "Rego cluster image policy main policy, checks out",
json: cipAttestation,
policyType: "rego",
policyFile: `package sigstore
default isCompliant = false
isCompliant {
attestationsKeylessATT := input.authorityMatches.keylessatt.attestations
count(attestationsKeylessATT) == 1
attestationsKeyATT := input.authorityMatches.keyatt.attestations
count(attestationsKeyATT) == 1
keySignature := input.authorityMatches.keysignature.signatures
count(keySignature) == 1
}`,
},
{
name: "Rego cluster image policy main policy, fails",
json: cipAttestation,
policyType: "rego",
wantErr: true,
wantErrSub: `failed evaluating rego policy for type Rego cluster image policy main policy, fails: policy is not compliant for query 'isCompliant = data.sigstore.isCompliant'`,
policyFile: `package sigstore
default isCompliant = false
isCompliant {
attestationsKeylessATT := input.authorityMatches.keylessatt.attestations
count(attestationsKeylessATT) == 2
attestationsKeyATT := input.authorityMatches.keyatt.attestations
count(attestationsKeyATT) == 1
keySignature := input.authorityMatches.keysignature.signatures
count(keySignature) == 1
}`,
}, {
name: "Rego cluster image policy main policy succeed with empty error msg",
json: cipAttestation,
policyType: "rego",
policyFile: `package sigstore
isCompliant[response] {
attestationsKeylessATT := input.authorityMatches.keylessatt.attestations
result = (count(attestationsKeylessATT) == 1)
attestationsKeyATT := input.authorityMatches.keyatt.attestations
result = (count(attestationsKeyATT) == 1)
keySignature := input.authorityMatches.keysignature.signatures
result = (count(keySignature) == 1)
errorMsg = ""
warnMsg = ""
response := {
"result" : result,
"error" : errorMsg,
"warning" : warnMsg
}
}`,
}, {
name: "Rego cluster image policy main policy, fails with custom error msg",
json: cipAttestation,
policyType: "rego",
wantErr: true,
wantErrSub: `Not found expected list of attestations`,
policyFile: `package sigstore
isCompliant[response] {
attestationsKeylessATT := input.authorityMatches.keylessatt.attestations
result = (count(attestationsKeylessATT) == 1000)
errorMsg = "Not found expected list of attestations"
warnMsg = ""
response := {
"result" : result,
"error" : errorMsg,
"warning" : warnMsg
}
}`,
}, {
name: "Rego cluster image policy main policy, returns a custom warning msg",
json: cipAttestation,
policyType: "rego",
wantErr: false,
wantWarnSub: `Throw warning error even if succeeded`,
policyFile: `package sigstore
isCompliant[response] {
attestationsKeylessATT := input.authorityMatches.keylessatt.attestations
result = (count(attestationsKeylessATT) == 1)
attestationsKeyATT := input.authorityMatches.keyatt.attestations
result = (count(attestationsKeyATT) == 1)
keySignature := input.authorityMatches.keysignature.signatures
result = (count(keySignature) == 1)
errorMsg = ""
warnMsg = "Throw warning error even if succeeded"
response := {
"result" : result,
"error" : errorMsg,
"warning" : warnMsg
}
}`,
}}
for _, tc := range tests {
ctx := context.Background()
warn, err := EvaluatePolicyAgainstJSON(ctx, tc.name, tc.policyType, tc.policyFile, []byte(tc.json))
if tc.wantErr {
if err == nil {
t.Errorf("Did not get an error, wanted %s", tc.wantErrSub)
} else if !strings.Contains(err.Error(), tc.wantErrSub) {
t.Errorf("Unexpected error, want: %s got: %s", tc.wantErrSub, err.Error())
}
if tc.wantWarnSub != "" && !strings.Contains(warn.Error(), tc.wantWarnSub) {
t.Errorf("Unexpected warning, want: %s got: %s", tc.wantErrSub, err.Error())
}
} else {
if !tc.wantErr && err != nil {
t.Errorf("Unexpected error, wanted none, got: %s", err.Error())
}
if tc.wantWarnSub != "" && !strings.Contains(warn.Error(), tc.wantWarnSub) {
t.Errorf("Unexpected warning, want: %s got: %s", tc.wantWarnSub, warn.Error())
}
}
}
}
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