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auth_proxy.go
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auth_proxy.go
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package middleware
import (
"fmt"
"net"
"net/mail"
"reflect"
"strings"
"time"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/login"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/services/session"
"github.com/grafana/grafana/pkg/setting"
)
var AUTH_PROXY_SESSION_VAR = "authProxyHeaderValue"
func initContextWithAuthProxy(ctx *m.ReqContext, orgID int64) bool {
if !setting.AuthProxyEnabled {
return false
}
proxyHeaderValue := ctx.Req.Header.Get(setting.AuthProxyHeaderName)
if len(proxyHeaderValue) == 0 {
return false
}
// if auth proxy ip(s) defined, check if request comes from one of those
if err := checkAuthenticationProxy(ctx.Req.RemoteAddr, proxyHeaderValue); err != nil {
ctx.Handle(407, "Proxy authentication required", err)
return true
}
// initialize session
if err := ctx.Session.Start(ctx.Context); err != nil {
log.Error(3, "Failed to start session", err)
return false
}
query := &m.GetSignedInUserQuery{OrgId: orgID}
// if this session has already been authenticated by authProxy just load the user
sessProxyValue := ctx.Session.Get(AUTH_PROXY_SESSION_VAR)
if sessProxyValue != nil && sessProxyValue.(string) == proxyHeaderValue && getRequestUserId(ctx) > 0 {
// if we're using ldap, sync user periodically
if setting.LdapEnabled {
syncQuery := &m.LoginUserQuery{
ReqContext: ctx,
Username: proxyHeaderValue,
}
if err := syncGrafanaUserWithLdapUser(syncQuery); err != nil {
if err == login.ErrInvalidCredentials {
ctx.Handle(500, "Unable to authenticate user", err)
return false
}
ctx.Handle(500, "Failed to sync user", err)
return false
}
}
query.UserId = getRequestUserId(ctx)
// if we're using ldap, pass authproxy login name to ldap user sync
} else if setting.LdapEnabled {
ctx.Session.Delete(session.SESS_KEY_LASTLDAPSYNC)
syncQuery := &m.LoginUserQuery{
ReqContext: ctx,
Username: proxyHeaderValue,
}
if err := syncGrafanaUserWithLdapUser(syncQuery); err != nil {
if err == login.ErrInvalidCredentials {
ctx.Handle(500, "Unable to authenticate user", err)
return false
}
ctx.Handle(500, "Failed to sync user", err)
return false
}
if syncQuery.User == nil {
ctx.Handle(500, "Failed to sync user", nil)
return false
}
query.UserId = syncQuery.User.Id
// no ldap, just use the info we have
} else {
extUser := &m.ExternalUserInfo{
AuthModule: "authproxy",
AuthId: proxyHeaderValue,
}
if setting.AuthProxyHeaderProperty == "username" {
extUser.Login = proxyHeaderValue
// only set Email if it can be parsed as an email address
emailAddr, emailErr := mail.ParseAddress(proxyHeaderValue)
if emailErr == nil {
extUser.Email = emailAddr.Address
}
} else if setting.AuthProxyHeaderProperty == "email" {
extUser.Email = proxyHeaderValue
extUser.Login = proxyHeaderValue
} else {
ctx.Handle(500, "Auth proxy header property invalid", nil)
return true
}
for _, field := range []string{"Name", "Email", "Login"} {
if setting.AuthProxyHeaders[field] == "" {
continue
}
if val := ctx.Req.Header.Get(setting.AuthProxyHeaders[field]); val != "" {
reflect.ValueOf(extUser).Elem().FieldByName(field).SetString(val)
}
}
// add/update user in grafana
cmd := &m.UpsertUserCommand{
ReqContext: ctx,
ExternalUser: extUser,
SignupAllowed: setting.AuthProxyAutoSignUp,
}
err := bus.Dispatch(cmd)
if err != nil {
ctx.Handle(500, "Failed to login as user specified in auth proxy header", err)
return true
}
query.UserId = cmd.Result.Id
}
if err := bus.Dispatch(query); err != nil {
ctx.Handle(500, "Failed to find user", err)
return true
}
// Make sure that we cannot share a session between different users!
if getRequestUserId(ctx) > 0 && getRequestUserId(ctx) != query.Result.UserId {
// remove session
if err := ctx.Session.Destory(ctx.Context); err != nil {
log.Error(3, "Failed to destroy session, err")
}
// initialize a new session
if err := ctx.Session.Start(ctx.Context); err != nil {
log.Error(3, "Failed to start session", err)
}
}
ctx.Session.Set(AUTH_PROXY_SESSION_VAR, proxyHeaderValue)
ctx.SignedInUser = query.Result
ctx.IsSignedIn = true
ctx.Session.Set(session.SESS_KEY_USERID, ctx.UserId)
return true
}
var syncGrafanaUserWithLdapUser = func(query *m.LoginUserQuery) error {
expireEpoch := time.Now().Add(time.Duration(-setting.AuthProxyLdapSyncTtl) * time.Minute).Unix()
var lastLdapSync int64
if lastLdapSyncInSession := query.ReqContext.Session.Get(session.SESS_KEY_LASTLDAPSYNC); lastLdapSyncInSession != nil {
lastLdapSync = lastLdapSyncInSession.(int64)
}
if lastLdapSync < expireEpoch {
ldapCfg := login.LdapCfg
if len(ldapCfg.Servers) < 1 {
return fmt.Errorf("No LDAP servers available")
}
for _, server := range ldapCfg.Servers {
author := login.NewLdapAuthenticator(server)
if err := author.SyncUser(query); err != nil {
return err
}
}
query.ReqContext.Session.Set(session.SESS_KEY_LASTLDAPSYNC, time.Now().Unix())
}
return nil
}
func checkAuthenticationProxy(remoteAddr string, proxyHeaderValue string) error {
if len(strings.TrimSpace(setting.AuthProxyWhitelist)) == 0 {
return nil
}
proxies := strings.Split(setting.AuthProxyWhitelist, ",")
sourceIP, _, err := net.SplitHostPort(remoteAddr)
if err != nil {
return err
}
// Compare allowed IP addresses to actual address
for _, proxyIP := range proxies {
if sourceIP == strings.TrimSpace(proxyIP) {
return nil
}
}
return fmt.Errorf("Request for user (%s) from %s is not from the authentication proxy", proxyHeaderValue, sourceIP)
}