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globalrole.go
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globalrole.go
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package auth
import (
"fmt"
v3 "github.com/rancher/rancher/pkg/apis/management.cattle.io/v3"
controllerv3 "github.com/rancher/webhook/pkg/generated/controllers/management.cattle.io/v3"
rbacv1 "k8s.io/api/rbac/v1"
)
// GlobalRoleResolver provides utilities to determine which rules a globalRoles gives in various contexts.
type GlobalRoleResolver struct {
roleTemplateResolver *RoleTemplateResolver
globalRoles controllerv3.GlobalRoleCache
}
const ownerRT = "cluster-owner"
var adminRoles = []string{"restricted-admin"}
// NewRoleTemplateResolver creates a newly allocated RoleTemplateResolver from the provided caches
func NewGlobalRoleResolver(roleTemplateResolver *RoleTemplateResolver, grCache controllerv3.GlobalRoleCache) *GlobalRoleResolver {
return &GlobalRoleResolver{
roleTemplateResolver: roleTemplateResolver,
globalRoles: grCache,
}
}
// GlobalRoleCache allows caller to retrieve the globalRoleCache used by the resolver.
func (g *GlobalRoleResolver) GlobalRoleCache() controllerv3.GlobalRoleCache {
return g.globalRoles
}
// GlobalRulesFromRole finds all rules which apply globally - meaning valid for escalation checks at the cluster scope
// in the local cluster.
func (g *GlobalRoleResolver) GlobalRulesFromRole(gr *v3.GlobalRole) []rbacv1.PolicyRule {
// no rules on a nil role
if gr == nil {
return nil
}
return gr.Rules
}
// ClusterRulesFromRole finds all rules which this gr gives on downstream clusters.
func (g *GlobalRoleResolver) ClusterRulesFromRole(gr *v3.GlobalRole) ([]rbacv1.PolicyRule, error) {
if gr == nil {
return nil, nil
}
// restricted admin is treated like it is owner of all downstream clusters
// but it doesn't get the same field because this would duplicate legacy logic
for _, name := range adminRoles {
if gr.Name == name {
templateRules, err := g.roleTemplateResolver.RulesFromTemplateName(ownerRT)
if err != nil {
return nil, fmt.Errorf("unable to resolve cluster-owner rules: %w", err)
}
return templateRules, nil
}
}
var rules []rbacv1.PolicyRule
for _, inheritedRoleTemplate := range gr.InheritedClusterRoles {
templateRules, err := g.roleTemplateResolver.RulesFromTemplateName(inheritedRoleTemplate)
if err != nil {
return nil, fmt.Errorf("unable to get cluster rules for roleTemplate %s: %w", inheritedRoleTemplate, err)
}
rules = append(rules, templateRules...)
}
return rules, nil
}
// GetRoleTemplate allows the caller to retrieve the roleTemplates in use by a given global role. Does not
// recursively evaluate roleTemplates - only returns the top-level resources.
func (g *GlobalRoleResolver) GetRoleTemplatesForGlobalRole(gr *v3.GlobalRole) ([]*v3.RoleTemplate, error) {
if gr == nil {
return nil, nil
}
var roleTemplates []*v3.RoleTemplate
for _, inheritedRoleTemplate := range gr.InheritedClusterRoles {
roleTemplate, err := g.roleTemplateResolver.RoleTemplateCache().Get(inheritedRoleTemplate)
if err != nil {
return nil, fmt.Errorf("unable to get roleTemplate %s: %w", inheritedRoleTemplate, err)
}
roleTemplates = append(roleTemplates, roleTemplate)
}
return roleTemplates, nil
}