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// Copyright 2013 Canonical Ltd.
// Licensed under the LGPLv3, see LICENCE file for details.
package utils
import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"fmt"
"net/http"
"strings"
)
// 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, certs ...string) *http.Client {
if len(certs) > 0 {
return getHTTPClientWithCerts(verify, certs)
}
if verify == VerifySSLHostnames {
return GetValidatingHTTPClient()
}
return GetNonValidatingHTTPClient()
}
// getHTTPClientWithCerts returns a new http.Client that verifies the
// server's certificate chain and hostname depending on arguments and
// adds ca certificates to the client. Returns nil if no certificates
// provided.
func getHTTPClientWithCerts(verify SSLHostnameVerification, certs []string) *http.Client {
if len(certs) == 0 {
return nil
}
pool := x509.NewCertPool()
for _, cert := range certs {
pool.AppendCertsFromPEM([]byte(cert))
}
tlsConfig := SecureTLSConfig()
tlsConfig.RootCAs = pool
if verify == NoVerifySSLHostnames {
tlsConfig.InsecureSkipVerify = true
}
return &http.Client{
Transport: NewHttpTLSTransport(tlsConfig),
}
}
// GetValidatingHTTPClient returns a new http.Client that
// verifies the server's certificate chain and hostname.
func GetValidatingHTTPClient() *http.Client {
return &http.Client{}
}
// GetNonValidatingHTTPClient returns a new http.Client that
// does not verify the server's certificate chain and hostname.
func GetNonValidatingHTTPClient() *http.Client {
return &http.Client{
Transport: NewHttpTLSTransport(&tls.Config{
InsecureSkipVerify: true,
}),
}
}
// 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},
}
}
// ParseBasicAuth attempts to find an Authorization header in the supplied
// http.Header and if found parses it as a Basic header. 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 ParseBasicAuthHeader(h http.Header) (userid, password string, err error) {
parts := strings.Fields(h.Get("Authorization"))
if len(parts) != 2 || parts[0] != "Basic" {
return "", "", fmt.Errorf("invalid or missing HTTP auth header")
}
// Challenge is a base64-encoded "tag:pass" string.
// See RFC 2617, Section 2.
challenge, err := base64.StdEncoding.DecodeString(parts[1])
if err != nil {
return "", "", fmt.Errorf("invalid HTTP auth encoding")
}
tokens := strings.SplitN(string(challenge), ":", 2)
if len(tokens) != 2 {
return "", "", fmt.Errorf("invalid HTTP auth contents")
}
return tokens[0], tokens[1], nil
}
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