/
discovery.go
186 lines (161 loc) · 5.85 KB
/
discovery.go
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package pkg
import (
"encoding/json"
arrayops "github.com/adam-hanna/arrayOperations"
"github.com/zachmann/go-oidcfed/internal"
"github.com/zachmann/go-oidcfed/internal/utils"
)
type OPDiscoverer interface {
Discover(authorities ...string) []*OpenIDProviderMetadata
}
// SimpleOPDiscoverer is an OPDiscoverer that checks authorities for subordinate OPs and verifies that those
// publish openid_provider metadata in their EntityConfiguration
type SimpleOPDiscoverer struct{}
// VerifiedChainsOPDiscoverer is an OPDiscoverer that compared to VerifiedOPDiscoverer additionally verifies that there
// is a valid TrustChain between the op and one of the specified trust anchors
type VerifiedChainsOPDiscoverer struct{}
type OPDiscoveryFilter interface {
Filter(*OpenIDProviderMetadata) bool
}
type opDiscoveryFilter struct {
filter func(*OpenIDProviderMetadata) bool
}
func (f opDiscoveryFilter) Filter(metadata *OpenIDProviderMetadata) bool {
return f.filter(metadata)
}
func NewOPDiscoveryFilter(filter func(metadata *OpenIDProviderMetadata) bool) OPDiscoveryFilter {
return opDiscoveryFilter{filter: filter}
}
type filterableVerifiedChainsOPDiscoverer struct {
Filters []OPDiscoveryFilter
}
type FilterableVerifiedChainsOPDiscoverer struct {
Filters []OPDiscoveryFilter
}
func (d SimpleOPDiscoverer) Discover(authorities ...TrustAnchor) (opInfos []*OpenIDProviderMetadata) {
internal.Logf("Discovering OPs for authorities: %+q", authorities)
for _, a := range authorities {
internal.Logf("Discovering OPs and subordinates for: %+q", a.EntityID)
stmt, err := getEntityConfiguration(a.EntityID)
if err != nil {
internal.Logf("Could not get entity configuration: %s -> skipping", err.Error())
continue
}
if stmt.Metadata == nil || stmt.Metadata.FederationEntity == nil || stmt.Metadata.FederationEntity.
FederationListEndpoint == "" {
internal.Log("Could not get list endpoint from metadata -> skipping")
continue
}
thoseOPs, err := fetchList(stmt.Metadata.FederationEntity.FederationListEndpoint, "openid_provider")
if err == nil {
internal.Logf("Found these (possible) OPs: %+q", thoseOPs)
for _, op := range thoseOPs {
internal.Logf("Checking OP: %+q", op)
entityConfig, err := getEntityConfiguration(op)
if err != nil {
internal.Logf("Could not get entity configuration: %s -> skipping", err.Error())
continue
}
if entityConfig.Metadata == nil || entityConfig.Metadata.OpenIDProvider == nil {
internal.Log("No OP metadata present -> skipping")
continue
}
opMetata := entityConfig.Metadata.OpenIDProvider
if opMetata.OrganizationName == "" && entityConfig.Metadata.FederationEntity != nil && entityConfig.
Metadata.FederationEntity.OrganizationName != "" {
opMetata.OrganizationName = entityConfig.Metadata.FederationEntity.OrganizationName
}
internal.Logf("Added OP %+q", op)
opInfos = append(opInfos, opMetata)
}
}
subordinates, err := fetchList(stmt.Metadata.FederationEntity.FederationListEndpoint, "federation_entity")
if err != nil {
continue
}
sOPs := d.Discover(NewTrustAnchorsFromEntityIDs(subordinates...)...)
opInfos = arrayops.Union(opInfos, sOPs)
}
return
}
func (VerifiedChainsOPDiscoverer) Discover(authorities ...TrustAnchor) (ops []*OpenIDProviderMetadata) {
return FilterableVerifiedChainsOPDiscoverer{}.Discover(authorities...)
}
func (d filterableVerifiedChainsOPDiscoverer) Discover(authorities ...TrustAnchor) (opInfos []*OpenIDProviderMetadata) {
in := SimpleOPDiscoverer{}.Discover(authorities...)
for _, op := range in {
var approved bool
for _, f := range d.Filters {
if approved = f.Filter(op); !approved {
break
}
}
if approved {
opInfos = append(opInfos, op)
}
}
return
}
func (d FilterableVerifiedChainsOPDiscoverer) Discover(authorities ...TrustAnchor) (opInfos []*OpenIDProviderMetadata) {
discoverer := filterableVerifiedChainsOPDiscoverer{
Filters: append(
[]OPDiscoveryFilter{
OPDiscoveryFilterVerifiedChains{
TrustAnchors: authorities,
},
}, d.Filters...,
),
}
return discoverer.Discover(authorities...)
}
type OPDiscoveryFilterVerifiedChains struct {
TrustAnchors TrustAnchors
}
func (f OPDiscoveryFilterVerifiedChains) Filter(op *OpenIDProviderMetadata) bool {
resolver := TrustResolver{
TrustAnchors: f.TrustAnchors,
StartingEntity: op.Issuer,
}
return len(resolver.ResolveToValidChains()) > 0
}
type opDiscoveryFilterAutomaticRegistration struct{}
func (opDiscoveryFilterAutomaticRegistration) Filter(op *OpenIDProviderMetadata) bool {
return utils.SliceContains(ClientRegistrationTypeAutomatic, op.ClientRegistrationTypesSupported)
}
type opDiscoveryFilterExplicitRegistration struct{}
func (opDiscoveryFilterExplicitRegistration) Filter(op *OpenIDProviderMetadata) bool {
return utils.SliceContains(ClientRegistrationTypeExplicit, op.ClientRegistrationTypesSupported)
}
var OPDiscoveryFilterExplicitRegistration opDiscoveryFilterExplicitRegistration
var OPDiscoveryFilterAutomaticRegistration opDiscoveryFilterAutomaticRegistration
func fetchList(listEndpoint, entityType string) ([]string, error) {
body, err := entityStatementObtainer.ListEntities(listEndpoint, entityType)
if err != nil {
return nil, err
}
var entities []string
if err = json.Unmarshal(body, &entities); err != nil {
return nil, err
}
return entities, nil
}
func OPDiscoveryFilterSupportedGrantTypesIncludes(neededGrantTypes ...string) OPDiscoveryFilter {
return NewOPDiscoveryFilter(
func(op *OpenIDProviderMetadata) bool {
if op == nil {
return false
}
return utils.ReflectIsSubsetOf(neededGrantTypes, op.GrantTypesSupported)
},
)
}
func OPDiscoveryFilterSupportedScopesIncludes(neededScopes ...string) OPDiscoveryFilter {
return NewOPDiscoveryFilter(
func(op *OpenIDProviderMetadata) bool {
if op == nil {
return false
}
return utils.ReflectIsSubsetOf(neededScopes, op.ScopesSupported)
},
)
}