/
client.go
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/
client.go
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// Package client implements a Go client for CFSSL API commands.
package client
import (
"bytes"
"crypto/tls"
"encoding/json"
stderr "errors"
"fmt"
"io"
"net"
"net/http"
"net/url"
"strconv"
"strings"
"time"
"github.com/cloudflare/cfssl/api"
"github.com/cloudflare/cfssl/auth"
"github.com/cloudflare/cfssl/errors"
"github.com/cloudflare/cfssl/info"
"github.com/cloudflare/cfssl/log"
)
// A server points to a single remote CFSSL instance.
type server struct {
URL string
TLSConfig *tls.Config
reqModifier func(*http.Request, []byte)
RequestTimeout time.Duration
proxy func(*http.Request) (*url.URL, error)
}
// A Remote points to at least one (but possibly multiple) remote
// CFSSL instances. It must be able to perform a authenticated and
// unauthenticated certificate signing requests, return information
// about the CA on the other end, and return a list of the hosts that
// are used by the remote.
type Remote interface {
AuthSign(req, id []byte, provider auth.Provider) ([]byte, error)
Sign(jsonData []byte) ([]byte, error)
Info(jsonData []byte) (*info.Resp, error)
Hosts() []string
SetReqModifier(func(*http.Request, []byte))
SetRequestTimeout(d time.Duration)
SetProxy(func(*http.Request) (*url.URL, error))
}
// NewServer sets up a new server target. The address should be of
// The format [protocol:]name[:port] of the remote CFSSL instance.
// If no protocol is given http is default. If no port
// is specified, the CFSSL default port (8888) is used. If the name is
// a comma-separated list of hosts, an ordered group will be returned.
func NewServer(addr string) Remote {
return NewServerTLS(addr, nil)
}
// NewServerTLS is the TLS version of NewServer
func NewServerTLS(addr string, tlsConfig *tls.Config) Remote {
addrs := strings.Split(addr, ",")
var remote Remote
if len(addrs) > 1 {
remote, _ = NewGroup(addrs, tlsConfig, StrategyOrderedList)
} else {
u, err := normalizeURL(addrs[0])
if err != nil {
log.Errorf("bad url: %v", err)
return nil
}
srv := newServer(u, tlsConfig)
if srv != nil {
remote = srv
}
}
return remote
}
func (srv *server) Hosts() []string {
return []string{srv.URL}
}
func (srv *server) SetReqModifier(mod func(*http.Request, []byte)) {
srv.reqModifier = mod
}
func (srv *server) SetRequestTimeout(timeout time.Duration) {
srv.RequestTimeout = timeout
}
func (srv *server) SetProxy(proxy func(*http.Request) (*url.URL, error)) {
srv.proxy = proxy
}
func newServer(u *url.URL, tlsConfig *tls.Config) *server {
URL := u.String()
return &server{
URL: URL,
TLSConfig: tlsConfig,
}
}
func (srv *server) getURL(endpoint string) string {
return fmt.Sprintf("%s/api/v1/cfssl/%s", srv.URL, endpoint)
}
func (srv *server) createTransport() *http.Transport {
// Start with defaults from http.DefaultTransport
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
DialContext: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
DualStack: true,
}).DialContext,
MaxIdleConns: 100,
IdleConnTimeout: 90 * time.Second,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
}
// Setup HTTPS client
tlsConfig := srv.TLSConfig
tlsConfig.BuildNameToCertificate()
transport.TLSClientConfig = tlsConfig
// Setup Proxy
if srv.proxy != nil {
transport.Proxy = srv.proxy
}
return transport
}
// post connects to the remote server and returns a Response struct
func (srv *server) post(url string, jsonData []byte) (*api.Response, error) {
var resp *http.Response
var err error
client := &http.Client{}
if srv.TLSConfig != nil {
client.Transport = srv.createTransport()
}
if srv.RequestTimeout != 0 {
client.Timeout = srv.RequestTimeout
}
req, err := http.NewRequest("POST", url, bytes.NewReader(jsonData))
if err != nil {
err = fmt.Errorf("failed POST to %s: %v", url, err)
return nil, errors.Wrap(errors.APIClientError, errors.ClientHTTPError, err)
}
req.Close = true
req.Header.Set("content-type", "application/json")
if srv.reqModifier != nil {
srv.reqModifier(req, jsonData)
}
resp, err = client.Do(req)
if err != nil {
err = fmt.Errorf("failed POST to %s: %v", url, err)
return nil, errors.Wrap(errors.APIClientError, errors.ClientHTTPError, err)
}
defer req.Body.Close()
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
if err != nil {
return nil, errors.Wrap(errors.APIClientError, errors.IOError, err)
}
if resp.StatusCode != http.StatusOK {
log.Errorf("http error with %s", url)
return nil, errors.Wrap(errors.APIClientError, errors.ClientHTTPError, stderr.New(string(body)))
}
var response api.Response
err = json.Unmarshal(body, &response)
if err != nil {
log.Debug("Unable to parse response body:", string(body))
return nil, errors.Wrap(errors.APIClientError, errors.JSONError, err)
}
if !response.Success || response.Result == nil {
if len(response.Errors) > 0 {
return nil, errors.Wrap(errors.APIClientError, errors.ServerRequestFailed, stderr.New(response.Errors[0].Message))
}
return nil, errors.New(errors.APIClientError, errors.ServerRequestFailed)
}
return &response, nil
}
// AuthSign fills out an authenticated signing request to the server,
// receiving a certificate or error in response.
// It takes the serialized JSON request to send, remote address and
// authentication provider.
func (srv *server) AuthSign(req, id []byte, provider auth.Provider) ([]byte, error) {
return srv.authReq(req, id, provider, "sign")
}
// AuthInfo fills out an authenticated info request to the server,
// receiving a certificate or error in response.
// It takes the serialized JSON request to send, remote address and
// authentication provider.
func (srv *server) AuthInfo(req, id []byte, provider auth.Provider) ([]byte, error) {
return srv.authReq(req, id, provider, "info")
}
// authReq is the common logic for AuthSign and AuthInfo -- perform the given
// request, and return the resultant certificate.
// The target is either 'sign' or 'info'.
func (srv *server) authReq(req, ID []byte, provider auth.Provider, target string) ([]byte, error) {
url := srv.getURL("auth" + target)
token, err := provider.Token(req)
if err != nil {
return nil, errors.Wrap(errors.APIClientError, errors.AuthenticationFailure, err)
}
aReq := &auth.AuthenticatedRequest{
Timestamp: time.Now().Unix(),
RemoteAddress: ID,
Token: token,
Request: req,
}
jsonData, err := json.Marshal(aReq)
if err != nil {
return nil, errors.Wrap(errors.APIClientError, errors.JSONError, err)
}
response, err := srv.post(url, jsonData)
if err != nil {
return nil, err
}
result, ok := response.Result.(map[string]interface{})
if !ok {
return nil, errors.New(errors.APIClientError, errors.JSONError)
}
cert, ok := result["certificate"].(string)
if !ok {
return nil, errors.New(errors.APIClientError, errors.JSONError)
}
return []byte(cert), nil
}
// Sign sends a signature request to the remote CFSSL server,
// receiving a signed certificate or an error in response.
// It takes the serialized JSON request to send.
func (srv *server) Sign(jsonData []byte) ([]byte, error) {
return srv.request(jsonData, "sign")
}
// Info sends an info request to the remote CFSSL server, receiving a
// response or an error in response.
// It takes the serialized JSON request to send.
func (srv *server) Info(jsonData []byte) (*info.Resp, error) {
res, err := srv.getResultMap(jsonData, "info")
if err != nil {
return nil, err
}
info := new(info.Resp)
if val, ok := res["certificate"]; ok {
info.Certificate = val.(string)
}
var usages []interface{}
if val, ok := res["usages"]; ok && val != nil {
usages = val.([]interface{})
}
if val, ok := res["expiry"]; ok && val != nil {
info.ExpiryString = val.(string)
}
info.Usage = make([]string, len(usages))
for i, s := range usages {
info.Usage[i] = s.(string)
}
return info, nil
}
func (srv *server) getResultMap(jsonData []byte, target string) (result map[string]interface{}, err error) {
url := srv.getURL(target)
response, err := srv.post(url, jsonData)
if err != nil {
return
}
result, ok := response.Result.(map[string]interface{})
if !ok {
err = errors.Wrap(errors.APIClientError, errors.ClientHTTPError, stderr.New("response is formatted improperly"))
return
}
return
}
// request performs the common logic for Sign and Info, performing the actual
// request and returning the resultant certificate.
func (srv *server) request(jsonData []byte, target string) ([]byte, error) {
result, err := srv.getResultMap(jsonData, target)
if err != nil {
return nil, err
}
cert := result["certificate"].(string)
if cert != "" {
return []byte(cert), nil
}
return nil, errors.Wrap(errors.APIClientError, errors.ClientHTTPError, stderr.New("response doesn't contain certificate."))
}
// AuthRemote acts as a Remote with a default Provider for AuthSign.
type AuthRemote struct {
Remote
provider auth.Provider
}
// NewAuthServer sets up a new auth server target with an addr
// in the same format at NewServer and a default authentication provider to
// use for Sign requests.
func NewAuthServer(addr string, tlsConfig *tls.Config, provider auth.Provider) *AuthRemote {
return &AuthRemote{
Remote: NewServerTLS(addr, tlsConfig),
provider: provider,
}
}
// Sign is overloaded to perform an AuthSign request using the default auth provider.
func (ar *AuthRemote) Sign(req []byte) ([]byte, error) {
return ar.AuthSign(req, nil, ar.provider)
}
// normalizeURL checks for http/https protocol, appends "http" as default protocol if not defined in url
func normalizeURL(addr string) (*url.URL, error) {
addr = strings.TrimSpace(addr)
u, err := url.Parse(addr)
if err != nil {
return nil, err
}
if u.Opaque != "" {
u.Host = net.JoinHostPort(u.Scheme, u.Opaque)
u.Opaque = ""
} else if u.Path != "" && !strings.Contains(u.Path, ":") {
u.Host = net.JoinHostPort(u.Path, "8888")
u.Path = ""
} else if u.Scheme == "" {
u.Host = u.Path
u.Path = ""
}
if u.Scheme != "https" {
u.Scheme = "http"
}
_, port, err := net.SplitHostPort(u.Host)
if err != nil {
_, port, err = net.SplitHostPort(u.Host + ":8888")
if err != nil {
return nil, err
}
}
if port != "" {
_, err = strconv.Atoi(port)
if err != nil {
return nil, err
}
}
return u, nil
}