185 lines
8.8 KiB
Go
185 lines
8.8 KiB
Go
package kmsrotationconformance
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import (
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"bytes"
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"crypto/sha256"
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"encoding/hex"
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"encoding/json"
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"errors"
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"fmt"
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"io"
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"regexp"
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"slices"
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"strings"
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"time"
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)
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const (
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CaptureSchema = "kms-rotation-capture-v1"
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ReportSchema = "kms-rotation-conformance-report-v1"
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)
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var digestPattern = regexp.MustCompile(`^sha256:[0-9a-f]{64}$`)
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type Capture struct {
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SchemaVersion string `json:"schema_version"`
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EvidenceSource string `json:"evidence_source"`
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CandidateVersion string `json:"candidate_version"`
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BuildDigest string `json:"build_digest"`
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Environment string `json:"environment"`
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ProviderRef string `json:"provider_ref"`
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WorkloadIdentityRef string `json:"workload_identity_ref"`
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ProviderAuditRef string `json:"provider_audit_ref"`
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AttestedByRef string `json:"attested_by_ref"`
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AttestedAt time.Time `json:"attested_at"`
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CollectedAt time.Time `json:"collected_at"`
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Rotations []RotationEvidence `json:"rotations"`
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}
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type RotationEvidence struct {
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SecretRef string `json:"secret_ref"`
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ConsumerRef string `json:"consumer_ref"`
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ConsumptionMode string `json:"consumption_mode"`
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OldVersionRef string `json:"old_version_ref"`
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NewVersionRef string `json:"new_version_ref"`
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StartedAt time.Time `json:"started_at"`
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CompletedAt time.Time `json:"completed_at"`
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NewCredentialVerified bool `json:"new_credential_verified"`
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OldCredentialRejected bool `json:"old_credential_rejected"`
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BusinessContinuityVerified bool `json:"business_continuity_verified"`
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SecretValueNotExported bool `json:"secret_value_not_exported"`
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PreRotationProbeRef string `json:"pre_rotation_probe_ref"`
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NewCredentialProbeRef string `json:"new_credential_probe_ref"`
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OldRejectionProbeRef string `json:"old_rejection_probe_ref"`
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ContinuityProbeRef string `json:"continuity_probe_ref"`
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AccessAuditRef string `json:"access_audit_ref"`
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}
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type Check struct {
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Code string `json:"code"`
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Status string `json:"status"`
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Detail string `json:"detail"`
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}
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type Report struct {
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SchemaVersion string `json:"schema_version"`
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Result string `json:"result"`
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GeneratedAt time.Time `json:"generated_at"`
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CandidateVersion string `json:"candidate_version"`
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BuildDigest string `json:"build_digest"`
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EvidenceScope string `json:"evidence_scope"`
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ExternalValidationRequired bool `json:"external_validation_required"`
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Environment string `json:"environment"`
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ProviderRef string `json:"provider_ref"`
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RotationCount int `json:"rotation_count"`
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ConsumptionModes []string `json:"consumption_modes"`
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InputSHA256 map[string]string `json:"input_sha256"`
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Checks []Check `json:"checks"`
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Disclaimer string `json:"disclaimer"`
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}
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func ParseCapture(content []byte) (Capture, error) {
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var capture Capture
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if err := decodeStrict(content, &capture); err != nil {
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return Capture{}, fmt.Errorf("decode KMS rotation capture: %w", err)
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}
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return capture, nil
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}
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func ParseReport(content []byte) (Report, error) {
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var report Report
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if err := decodeStrict(content, &report); err != nil {
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return Report{}, fmt.Errorf("decode KMS rotation report: %w", err)
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}
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return report, nil
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}
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func Evaluate(capture Capture, candidateVersion, buildDigest string, generatedAt time.Time) Report {
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candidateVersion = strings.TrimSpace(candidateVersion)
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buildDigest = strings.ToLower(strings.TrimSpace(buildDigest))
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report := Report{
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SchemaVersion: ReportSchema, Result: "PASS", GeneratedAt: generatedAt.UTC(), CandidateVersion: candidateVersion,
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BuildDigest: buildDigest, EvidenceScope: "LOCAL_SECRET", ExternalValidationRequired: true,
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Environment: capture.Environment, ProviderRef: capture.ProviderRef, RotationCount: len(capture.Rotations),
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ConsumptionModes: []string{}, InputSHA256: map[string]string{}, Checks: []Check{},
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Disclaimer: "轮换一致性报告只证明所提供的身份、版本、认证探针、业务连续性和审计引用相互一致；不复制密钥正文，也不替代生产发布审批。",
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}
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if capture.EvidenceSource == "KMS_HSM" {
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report.EvidenceScope = "REAL_KMS_HSM"
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}
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add := func(code string, ok bool, detail string) {
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status := "PASS"
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if !ok {
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status, report.Result = "FAIL", "FAIL"
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}
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report.Checks = append(report.Checks, Check{Code: code, Status: status, Detail: detail})
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}
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add("CAPTURE_SCHEMA", capture.SchemaVersion == CaptureSchema, "轮换证据必须使用"+CaptureSchema)
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add("EVIDENCE_SOURCE", capture.EvidenceSource == "LOCAL" || capture.EvidenceSource == "KMS_HSM", "证据来源必须明确为LOCAL或KMS_HSM")
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add("CANDIDATE_IDENTITY", candidateVersion != "" && digestPattern.MatchString(buildDigest), "候选版本和sha256构建摘要必须完整")
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add("CAPTURE_CANDIDATE_BINDING", capture.CandidateVersion == candidateVersion && strings.ToLower(capture.BuildDigest) == buildDigest, "轮换采集必须绑定同一候选版本和构建摘要")
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real := capture.EvidenceSource == "KMS_HSM"
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providerOK := capture.ProviderRef != "" && capture.AttestedByRef != "" && !capture.AttestedAt.IsZero() && !capture.CollectedAt.IsZero() && !capture.AttestedAt.After(capture.CollectedAt)
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if real {
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providerOK = providerOK && (capture.Environment == "STAGING" || capture.Environment == "PRODUCTION") && capture.WorkloadIdentityRef != "" && capture.ProviderAuditRef != ""
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} else {
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providerOK = providerOK && capture.Environment == "LOCAL"
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}
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add("PROVIDER_IDENTITY", providerOK, "真实证据必须绑定云KMS/HSM、工作负载身份、提供器审计和安全复核引用")
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rotationsOK, versionOK, newOK, oldOK, continuityOK, refsOK := len(capture.Rotations) > 0, true, true, true, true, true
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seenSecrets, modes := map[string]bool{}, map[string]bool{}
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for _, rotation := range capture.Rotations {
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if rotation.SecretRef == "" || rotation.ConsumerRef == "" || seenSecrets[rotation.SecretRef+"|"+rotation.ConsumerRef] || !slices.Contains([]string{"DYNAMIC_READ", "ROLLING_RESTART"}, rotation.ConsumptionMode) || rotation.StartedAt.IsZero() || rotation.CompletedAt.IsZero() || rotation.CompletedAt.Before(rotation.StartedAt) || rotation.CompletedAt.After(capture.CollectedAt) || !rotation.SecretValueNotExported {
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rotationsOK = false
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}
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seenSecrets[rotation.SecretRef+"|"+rotation.ConsumerRef] = true
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modes[rotation.ConsumptionMode] = true
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versionOK = versionOK && rotation.OldVersionRef != "" && rotation.NewVersionRef != "" && rotation.OldVersionRef != rotation.NewVersionRef
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newOK = newOK && rotation.NewCredentialVerified
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oldOK = oldOK && rotation.OldCredentialRejected
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continuityOK = continuityOK && rotation.BusinessContinuityVerified
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refsOK = refsOK && rotation.PreRotationProbeRef != "" && rotation.NewCredentialProbeRef != "" && rotation.OldRejectionProbeRef != "" && rotation.ContinuityProbeRef != "" && rotation.AccessAuditRef != ""
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}
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for mode := range modes {
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report.ConsumptionModes = append(report.ConsumptionModes, mode)
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}
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sortStrings(report.ConsumptionModes)
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if real {
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rotationsOK = rotationsOK && modes["DYNAMIC_READ"] && modes["ROLLING_RESTART"]
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}
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add("ROTATION_SCOPE", rotationsOK, "真实KMS/HSM必须覆盖逐请求动态读取和受控滚动重启两种消费模式")
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add("VERSION_TRANSITION", versionOK, "每次轮换必须从非空旧版本切换到不同的新版本")
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add("NEW_CREDENTIAL_ACCEPTED", newOK, "新凭据必须通过实际认证探针")
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add("OLD_CREDENTIAL_REJECTED", oldOK, "旧凭据必须在轮换窗口结束后稳定拒绝")
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add("BUSINESS_CONTINUITY", continuityOK, "轮换期间业务连续性探针必须通过")
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add("AUDIT_REFERENCES", refsOK, "每次轮换必须保存基线、新凭据、旧凭据拒绝、连续性和访问审计引用")
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if real && providerOK && rotationsOK && versionOK && newOK && oldOK && continuityOK && refsOK && report.Result == "PASS" {
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report.ExternalValidationRequired = false
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}
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return report
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}
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func SHA256(content []byte) string {
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digest := sha256.Sum256(content)
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return hex.EncodeToString(digest[:])
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}
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func decodeStrict(content []byte, target any) error {
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decoder := json.NewDecoder(bytes.NewReader(content))
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decoder.DisallowUnknownFields()
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if err := decoder.Decode(target); err != nil {
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return err
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}
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var trailing any
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if err := decoder.Decode(&trailing); !errors.Is(err, io.EOF) {
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return errors.New("trailing JSON data")
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}
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return nil
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}
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func sortStrings(values []string) {
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slices.Sort(values)
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}
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