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| // 零信任认证中间件
package auth
import (
"context"
"fmt"
"time"
"github.com/coreos/go-oidc/v3/oidc"
"golang.org/x/oauth2"
)
type ZeroTrustAuth struct {
provider *oidc.Provider
verifier *oidc.IDTokenVerifier
tokenVerifier *TokenVerifier
policyEngine *PolicyEngine
}
type Identity struct {
Subject string `json:"sub"`
Email string `json:"email"`
Groups []string `json:"groups"`
Attributes map[string]string `json:"attributes"`
AuthTime time.Time `json:"auth_time"`
Issuer string `json:"iss"`
Audience []string `json:"aud"`
}
func NewZeroTrustAuth(issuerURL, clientID string) (*ZeroTrustAuth, error) {
provider, err := oidc.NewProvider(context.Background(), issuerURL)
if err != nil {
return nil, fmt.Errorf("failed to create provider: %w", err)
}
verifier := provider.Verifier(&oidc.Config{
ClientID: clientID,
})
return &ZeroTrustAuth{
provider: provider,
verifier: verifier,
tokenVerifier: NewTokenVerifier(),
policyEngine: NewPolicyEngine(),
}, nil
}
// 验证请求
func (z *ZeroTrustAuth) AuthenticateRequest(
ctx context.Context,
token string,
resource string,
action string,
) (*AuthResult, error) {
// 1. 验证令牌格式和签名
idToken, err := z.verifier.Verify(ctx, token)
if err != nil {
return nil, fmt.Errorf("token verification failed: %w", err)
}
// 2. 提取身份信息
var claims struct {
Subject string `json:"sub"`
Email string `json:"email"`
Groups []string `json:"groups"`
Attributes map[string]string `json:"attributes"`
Issuer string `json:"iss"`
Audience []string `json:"aud"`
}
if err := idToken.Claims(&claims); err != nil {
return nil, fmt.Errorf("failed to parse claims: %w", err)
}
identity := &Identity{
Subject: claims.Subject,
Email: claims.Email,
Groups: claims.Groups,
Attributes: claims.Attributes,
AuthTime: idToken.IssuedAt,
Issuer: claims.Issuer,
Audience: claims.Audience,
}
// 3. 检查令牌有效期
if time.Now().After(idToken.Expiry) {
return nil, fmt.Errorf("token expired")
}
// 4. 执行零信任策略检查
decision, err := z.policyEngine.Evaluate(ctx, &PolicyRequest{
Identity: identity,
Resource: resource,
Action: action,
Context: z.extractContext(ctx),
})
if err != nil {
return nil, fmt.Errorf("policy evaluation failed: %w", err)
}
if !decision.Allowed {
return &AuthResult{
Allowed: false,
Reason: decision.Reason,
}, nil
}
// 5. 返回授权结果
return &AuthResult{
Allowed: true,
Identity: identity,
Decision: decision,
ExpiresAt: idToken.Expiry,
}, nil
}
// 策略引擎
type PolicyEngine struct {
policies []Policy
casbin *casbin.Enforcer
}
type PolicyRequest struct {
Identity *Identity
Resource string
Action string
Context RequestContext
}
type PolicyDecision struct {
Allowed bool
Reason string
Constraints map[string]string
}
func (p *PolicyEngine) Evaluate(
ctx context.Context,
req *PolicyRequest,
) (*PolicyDecision, error) {
// 1. 检查 RBAC 策略
allowed, err := p.casbin.Enforce(
req.Identity.Subject,
req.Resource,
req.Action,
)
if err != nil {
return nil, fmt.Errorf("casbin enforcement failed: %w", err)
}
if !allowed {
return &PolicyDecision{
Allowed: false,
Reason: "RBAC policy denied",
}, nil
}
// 2. 检查 ABAC 策略
for _, policy := range p.policies {
decision, err := policy.Evaluate(ctx, req)
if err != nil {
return nil, fmt.Errorf("policy evaluation failed: %w", err)
}
if !decision.Allowed {
return decision, nil
}
}
// 3. 应用上下文约束
if err := p.checkContextConstraints(ctx, req); err != nil {
return &PolicyDecision{
Allowed: false,
Reason: err.Error(),
}, nil
}
return &PolicyDecision{
Allowed: true,
Reason: "All policies satisfied",
}, nil
}
// 属性策略
type AttributePolicy struct {
Name string
Rules []AttributeRule
}
type AttributeRule struct {
Attribute string
Operator string
Value interface{}
}
func (p *AttributePolicy) Evaluate(
ctx context.Context,
req *PolicyRequest,
) (*PolicyDecision, error) {
for _, rule := range p.Rules {
// 获取属性值
value := req.Identity.Attributes[rule.Attribute]
if value == "" {
value = getAttributeFromContext(req, rule.Attribute)
}
// 应用规则
if !p.evaluateRule(value, rule.Operator, rule.Value) {
return &PolicyDecision{
Allowed: false,
Reason: fmt.Sprintf("Attribute policy %s denied", p.Name),
}, nil
}
}
return &PolicyDecision{
Allowed: true,
}, nil
}
|