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package lego
import (
"crypto/tls"
"crypto/x509"
"fmt"
"net"
"net/http"
"os"
"strconv"
"strings"
"time"
"github.com/go-acme/lego/v4/certcrypto"
"github.com/go-acme/lego/v4/registration"
)
const (
// caCertificatesEnvVar is the environment variable name that can be used to
// specify the path to PEM encoded CA Certificates that can be used to
// authenticate an ACME server with an HTTPS certificate not issued by a CA in
// the system-wide trusted root list.
// Multiple file paths can be added by using os.PathListSeparator as a separator.
caCertificatesEnvVar = "LEGO_CA_CERTIFICATES"
// caSystemCertPool is the environment variable name that can be used to define
// if the certificates pool must use a copy of the system cert pool.
caSystemCertPool = "LEGO_CA_SYSTEM_CERT_POOL"
// caServerNameEnvVar is the environment variable name that can be used to
// specify the CA server name that can be used to
// authenticate an ACME server with a HTTPS certificate not issued by a CA in
// the system-wide trusted root list.
caServerNameEnvVar = "LEGO_CA_SERVER_NAME"
// LEDirectoryProduction URL to the Let's Encrypt production.
LEDirectoryProduction = "https://acme-v02.api.letsencrypt.org/directory"
// LEDirectoryStaging URL to the Let's Encrypt staging.
LEDirectoryStaging = "https://acme-staging-v02.api.letsencrypt.org/directory"
)
type Config struct {
CADirURL string
User registration.User
UserAgent string
HTTPClient *http.Client
Certificate CertificateConfig
}
func NewConfig(user registration.User) *Config {
return &Config{
CADirURL: LEDirectoryProduction,
User: user,
HTTPClient: createDefaultHTTPClient(),
Certificate: CertificateConfig{
KeyType: certcrypto.RSA2048,
Timeout: 30 * time.Second,
},
}
}
type CertificateConfig struct {
KeyType certcrypto.KeyType
Timeout time.Duration
}
// createDefaultHTTPClient Creates an HTTP client with a reasonable timeout value
// and potentially a custom *x509.CertPool
// based on the caCertificatesEnvVar environment variable (see the `initCertPool` function).
func createDefaultHTTPClient() *http.Client {
return &http.Client{
Timeout: 2 * time.Minute,
Transport: &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).DialContext,
TLSHandshakeTimeout: 30 * time.Second,
ResponseHeaderTimeout: 30 * time.Second,
TLSClientConfig: &tls.Config{
ServerName: os.Getenv(caServerNameEnvVar),
RootCAs: initCertPool(),
},
},
}
}
// initCertPool creates a *x509.CertPool populated with the PEM certificates
// found in the filepath specified in the caCertificatesEnvVar OS environment variable.
// If the caCertificatesEnvVar is not set then initCertPool will return nil.
// If there is an error creating a *x509.CertPool from the provided caCertificatesEnvVar value then initCertPool will panic.
// If the caSystemCertPool is set to a "truthy value" (`1`, `t`, `T`, `TRUE`, `true`, `True`) then a copy of system cert pool will be used.
// caSystemCertPool requires caCertificatesEnvVar to be set.
func initCertPool() *x509.CertPool {
customCACertsPath := os.Getenv(caCertificatesEnvVar)
if customCACertsPath == "" {
return nil
}
certPool := getCertPool()
for _, customPath := range strings.Split(customCACertsPath, string(os.PathListSeparator)) {
customCAs, err := os.ReadFile(customPath)
if err != nil {
panic(fmt.Sprintf("error reading %s=%q: %v",
caCertificatesEnvVar, customPath, err))
}
if ok := certPool.AppendCertsFromPEM(customCAs); !ok {
panic(fmt.Sprintf("error creating x509 cert pool from %s=%q: %v",
caCertificatesEnvVar, customPath, err))
}
}
return certPool
}
func getCertPool() *x509.CertPool {
useSystemCertPool, _ := strconv.ParseBool(os.Getenv(caSystemCertPool))
if !useSystemCertPool {
return x509.NewCertPool()
}
pool, err := x509.SystemCertPool()
if err == nil {
return pool
}
return x509.NewCertPool()
}
|
