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// Copyright 2013 Canonical Ltd.
// Licensed under the AGPLv3, see LICENCE file for details.
package utils
import (
"crypto/tls"
"encoding/base64"
"net/http"
"sync"
)
var insecureClient = (*http.Client)(nil)
var insecureClientMutex = sync.Mutex{}
func init() {
// See https://code.google.com/p/go/issues/detail?id=4677
// We need to force the connection to close each time so that we don't
// hit the above Go bug.
defaultTransport := http.DefaultTransport.(*http.Transport)
defaultTransport.DisableKeepAlives = true
registerFileProtocol(defaultTransport)
}
// registerFileProtocol registers support for file:// URLs on the given transport.
func registerFileProtocol(transport *http.Transport) {
transport.RegisterProtocol("file", http.NewFileTransport(http.Dir("/")))
}
// SSLHostnameVerification is used as a switch for when a given provider might
// use self-signed credentials and we should not try to verify the hostname on
// the TLS/SSL certificates
type SSLHostnameVerification bool
const (
// VerifySSLHostnames ensures we verify the hostname on the certificate
// matches the host we are connecting and is signed
VerifySSLHostnames = SSLHostnameVerification(true)
// NoVerifySSLHostnames informs us to skip verifying the hostname
// matches a valid certificate
NoVerifySSLHostnames = SSLHostnameVerification(false)
)
// GetHTTPClient returns either a standard http client or
// non validating client depending on the value of verify.
func GetHTTPClient(verify SSLHostnameVerification) *http.Client {
if verify == VerifySSLHostnames {
return GetValidatingHTTPClient()
}
return GetNonValidatingHTTPClient()
}
// GetValidatingHTTPClient returns a new http.Client that
// verifies the server's certificate chain and hostname.
func GetValidatingHTTPClient() *http.Client {
logger.Infof("hostname SSL verification enabled")
return http.DefaultClient
}
// GetNonValidatingHTTPClient returns a new http.Client that
// does not verify the server's certificate chain and hostname.
func GetNonValidatingHTTPClient() *http.Client {
logger.Infof("hostname SSL verification disabled")
insecureClientMutex.Lock()
defer insecureClientMutex.Unlock()
if insecureClient == nil {
insecureConfig := &tls.Config{InsecureSkipVerify: true}
insecureTransport := NewHttpTLSTransport(insecureConfig)
insecureClient = &http.Client{Transport: insecureTransport}
}
return insecureClient
}
// NewHttpTLSTransport returns a new http.Transport constructed with the TLS config
// and the necessary parameters for Juju.
func NewHttpTLSTransport(tlsConfig *tls.Config) *http.Transport {
// See https://code.google.com/p/go/issues/detail?id=4677
// We need to force the connection to close each time so that we don't
// hit the above Go bug.
transport := &http.Transport{
TLSClientConfig: tlsConfig,
DisableKeepAlives: true,
}
registerFileProtocol(transport)
return transport
}
// BasicAuthHeader creates a header that contains just the "Authorization"
// entry. The implementation was originally taked from net/http but this is
// needed externally from the http request object in order to use this with
// our websockets. See 2 (end of page 4) http://www.ietf.org/rfc/rfc2617.txt
// "To receive authorization, the client sends the userid and password,
// separated by a single colon (":") character, within a base64 encoded string
// in the credentials."
func BasicAuthHeader(username, password string) http.Header {
auth := username + ":" + password
encoded := "Basic " + base64.StdEncoding.EncodeToString([]byte(auth))
return http.Header{
"Authorization": {encoded},
}
}
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