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basicauth.go
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basicauth.go
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package tokencmd
import (
"encoding/base64"
"fmt"
"io"
"net/http"
"os"
"regexp"
"strings"
"github.com/golang/glog"
"github.com/openshift/origin/pkg/cmd/util/term"
)
func BasicEnabled() bool {
return true
}
type BasicChallengeHandler struct {
// Host is the server being authenticated to. Used only for displaying messages when prompting for username/password
Host string
// Reader is used to prompt for username/password. If nil, no prompting is done
Reader io.Reader
// Writer is used to output prompts. If nil, stdout is used
Writer io.Writer
// Username is the username to use when challenged. If empty, a prompt is issued to a non-nil Reader
Username string
// Password is the password to use when challenged. If empty, a prompt is issued to a non-nil Reader
Password string
// handled tracks whether this handler has already handled a challenge.
handled bool
// prompted tracks whether this handler has already prompted for a username and/or password.
prompted bool
}
func (c *BasicChallengeHandler) CanHandle(headers http.Header) bool {
isBasic, _ := basicRealm(headers)
return isBasic
}
func (c *BasicChallengeHandler) HandleChallenge(requestURL string, headers http.Header) (http.Header, bool, error) {
if c.prompted {
glog.V(2).Info("already prompted for challenge, won't prompt again")
return nil, false, nil
}
if c.handled {
glog.V(2).Info("already handled basic challenge")
return nil, false, nil
}
username := c.Username
password := c.Password
missingUsername := len(username) == 0
missingPassword := len(password) == 0
if (missingUsername || missingPassword) && c.Reader != nil {
w := c.Writer
if w == nil {
w = os.Stdout
}
if _, realm := basicRealm(headers); len(realm) > 0 {
fmt.Fprintf(w, "Authentication required for %s (%s)\n", c.Host, realm)
} else {
fmt.Fprintf(w, "Authentication required for %s\n", c.Host)
}
if missingUsername {
username = term.PromptForString(c.Reader, w, "Username: ")
} else {
fmt.Fprintf(w, "Username: %s\n", username)
}
if missingPassword {
password = term.PromptForPasswordString(c.Reader, w, "Password: ")
}
// remember so we don't re-prompt
c.prompted = true
}
if len(username) > 0 || len(password) > 0 {
// Basic auth does not support usernames containing colons
// http://tools.ietf.org/html/rfc2617#section-2
if strings.Contains(username, ":") {
return nil, false, fmt.Errorf("username %s is invalid for basic auth", username)
}
responseHeaders := http.Header{}
responseHeaders.Set("Authorization", getBasicHeader(username, password))
// remember so we don't re-handle non-interactively
c.handled = true
return responseHeaders, true, nil
}
glog.V(2).Info("no username or password available")
return nil, false, nil
}
func (c *BasicChallengeHandler) CompleteChallenge(requestURL string, headers http.Header) error {
return nil
}
func (c *BasicChallengeHandler) Release() error {
return nil
}
// if any of these match a WWW-Authenticate header, it is a basic challenge
// capturing group 1 (if present) should contain the realm
var basicRegexes = []*regexp.Regexp{
// quoted realm
regexp.MustCompile(`(?i)^\s*basic\s+realm\s*=\s*"(.*?)"\s*(,|$)`),
// token realm
regexp.MustCompile(`(?i)^\s*basic\s+realm\s*=\s*(.*?)\s*(,|$)`),
// no realm
regexp.MustCompile(`(?i)^\s*basic(?:\s+|$)`),
}
func basicRealm(headers http.Header) (bool, string) {
for _, challengeHeader := range headers[http.CanonicalHeaderKey("WWW-Authenticate")] {
for _, r := range basicRegexes {
if matches := r.FindStringSubmatch(challengeHeader); matches != nil {
if len(matches) > 1 {
// We got a realm as well
return true, matches[1]
}
// No realm, but still basic
return true, ""
}
}
}
return false, ""
}
func getBasicHeader(username, password string) string {
return "Basic " + base64.StdEncoding.EncodeToString([]byte(username+":"+password))
}