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feat: Add source code for "Secure Your Services" chapter - part 2 (#35)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,34 @@ | ||
| package auth | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/casbin/casbin" | ||
| "google.golang.org/grpc/codes" | ||
| "google.golang.org/grpc/status" | ||
| ) | ||
|
|
||
| func New(model, policy string) *Authorizer { | ||
| enforcer := casbin.NewEnforcer(model, policy) | ||
| return &Authorizer{ | ||
| enforcer: enforcer, | ||
| } | ||
| } | ||
|
|
||
| type Authorizer struct { | ||
| enforcer *casbin.Enforcer | ||
| } | ||
|
|
||
| func (a *Authorizer) Authorize(subject, object, action string) error { | ||
| if !a.enforcer.Enforce(subject, object, action) { | ||
| msg := fmt.Sprintf( | ||
| "%s not permitted to %s to %s", | ||
| subject, | ||
| action, | ||
| object, | ||
| ) | ||
| st := status.New(codes.PermissionDenied, msg) | ||
| return st.Err() | ||
| } | ||
| return nil | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,29 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "os" | ||
| "path/filepath" | ||
| ) | ||
|
|
||
| var ( | ||
| CAFile = configFile("ca.pem") | ||
| ServerCertFile = configFile("server.pem") | ||
| ServerKeyFile = configFile("server-key.pem") | ||
| RootClientCertFile = configFile("root-client.pem") | ||
| RootClientKeyFile = configFile("root-client-key.pem") | ||
| NobodyClientCertFile = configFile("nobody-client.pem") | ||
| NobodyClientKeyFile = configFile("nobody-client-key.pem") | ||
| ACLModelFile = configFile("model.conf") | ||
| ACLPolicyFile = configFile("policy.csv") | ||
| ) | ||
|
|
||
| func configFile(filename string) string { | ||
| if dir := os.Getenv("CONFIG_DIR"); dir != "" { | ||
| return filepath.Join(dir, filename) | ||
| } | ||
| homeDir, err := os.UserHomeDir() | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
| return filepath.Join(homeDir, ".proglog", filename) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| package config | ||
|
|
||
| import ( | ||
| "crypto/tls" | ||
| "crypto/x509" | ||
| "fmt" | ||
| "os" | ||
| ) | ||
|
|
||
| func SetupTLSConfig(cfg TLSConfig) (*tls.Config, error) { | ||
| var err error | ||
| tlsConfig := &tls.Config{} | ||
| if cfg.CertFile != "" && cfg.KeyFile != "" { | ||
| tlsConfig.Certificates = make([]tls.Certificate, 1) | ||
| tlsConfig.Certificates[0], err = tls.LoadX509KeyPair( | ||
| cfg.CertFile, | ||
| cfg.KeyFile, | ||
| ) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
| if cfg.CAFile != "" { | ||
| b, err := os.ReadFile(cfg.CAFile) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| ca := x509.NewCertPool() | ||
| ok := ca.AppendCertsFromPEM([]byte(b)) | ||
| if !ok { | ||
| return nil, fmt.Errorf( | ||
| "failed to parse root certificate: %q", | ||
| cfg.CAFile, | ||
| ) | ||
| } | ||
| if cfg.Server { | ||
| tlsConfig.ClientCAs = ca | ||
| tlsConfig.ClientAuth = tls.RequireAndVerifyClientCert | ||
| } else { | ||
| tlsConfig.RootCAs = ca | ||
| } | ||
| tlsConfig.ServerName = cfg.ServerAddress | ||
| } | ||
| return tlsConfig, nil | ||
| } | ||
|
|
||
| type TLSConfig struct { | ||
| CertFile string | ||
| KeyFile string | ||
| CAFile string | ||
| ServerAddress string | ||
| Server bool | ||
| } |
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