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package trust
import (
"fmt"
"sort"
"strings"
)
// Policy describes a basic trust policy configuration
type Policy struct {
Transport string `json:"transport"`
Name string `json:"name,omitempty"`
RepoName string `json:"repo_name,omitempty"`
Keys []string `json:"keys,omitempty"`
SignatureStore string `json:"sigstore,omitempty"`
Type string `json:"type"`
GPGId string `json:"gpg_id,omitempty"`
}
// PolicyDescription returns an user-focused description of the policy in policyPath and registries.d data from registriesDirPath.
func PolicyDescription(policyPath, registriesDirPath string) ([]*Policy, error) {
return policyDescriptionWithGPGIDReader(policyPath, registriesDirPath, getGPGIdFromKeyPath)
}
// policyDescriptionWithGPGIDReader is PolicyDescription with a gpgIDReader parameter. It exists only to make testing easier.
func policyDescriptionWithGPGIDReader(policyPath, registriesDirPath string, idReader gpgIDReader) ([]*Policy, error) {
policyContentStruct, err := getPolicy(policyPath)
if err != nil {
return nil, fmt.Errorf("could not read trust policies: %w", err)
}
res, err := getPolicyShowOutput(policyContentStruct, registriesDirPath, idReader)
if err != nil {
return nil, fmt.Errorf("could not show trust policies: %w", err)
}
return res, nil
}
func getPolicyShowOutput(policyContentStruct policyContent, systemRegistriesDirPath string, idReader gpgIDReader) ([]*Policy, error) {
var output []*Policy
registryConfigs, err := loadAndMergeConfig(systemRegistriesDirPath)
if err != nil {
return nil, err
}
if len(policyContentStruct.Default) > 0 {
template := Policy{
Transport: "all",
Name: "* (default)",
RepoName: "default",
}
output = append(output, descriptionsOfPolicyRequirements(policyContentStruct.Default, template, registryConfigs, "", idReader)...)
}
// FIXME: This should use x/exp/maps.Keys after we update to Go 1.18.
transports := []string{}
for t := range policyContentStruct.Transports {
transports = append(transports, t)
}
sort.Strings(transports)
for _, transport := range transports {
transval := policyContentStruct.Transports[transport]
if transport == "docker" {
transport = "repository"
}
// FIXME: This should use x/exp/maps.Keys after we update to Go 1.18.
scopes := []string{}
for s := range transval {
scopes = append(scopes, s)
}
sort.Strings(scopes)
for _, repo := range scopes {
repoval := transval[repo]
template := Policy{
Transport: transport,
Name: repo,
RepoName: repo,
}
output = append(output, descriptionsOfPolicyRequirements(repoval, template, registryConfigs, repo, idReader)...)
}
}
return output, nil
}
// descriptionsOfPolicyRequirements turns reqs into user-readable policy entries, with Transport/Name/Reponame coming from template, potentially looking up scope (which may be "") in registryConfigs.
func descriptionsOfPolicyRequirements(reqs []repoContent, template Policy, registryConfigs *registryConfiguration, scope string, idReader gpgIDReader) []*Policy {
entry := template
entry.Type = trustTypeDescription(reqs[0].Type)
uids := []string{}
for _, repoele := range reqs {
if len(repoele.KeyPath) > 0 {
uids = append(uids, idReader(repoele.KeyPath)...)
}
if len(repoele.KeyData) > 0 {
uids = append(uids, getGPGIdFromKeyData(idReader, repoele.KeyData)...)
}
}
entry.GPGId = strings.Join(uids, ", ")
registryNamespace := registriesDConfigurationForScope(registryConfigs, scope)
if registryNamespace != nil {
if registryNamespace.Lookaside != "" {
entry.SignatureStore = registryNamespace.Lookaside
} else { // incl. registryNamespace.SigStore == ""
entry.SignatureStore = registryNamespace.SigStore
}
}
return []*Policy{&entry}
}
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