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ds_proxy.go
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ds_proxy.go
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package pluginproxy
import (
"bytes"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strconv"
"strings"
"time"
"github.com/opentracing/opentracing-go"
"github.com/grafana/grafana/pkg/log"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/plugins"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/util"
)
var (
logger = log.New("data-proxy-log")
client = newHTTPClient()
)
type DataSourceProxy struct {
ds *m.DataSource
ctx *m.ReqContext
targetUrl *url.URL
proxyPath string
route *plugins.AppPluginRoute
plugin *plugins.DataSourcePlugin
}
type httpClient interface {
Do(req *http.Request) (*http.Response, error)
}
func NewDataSourceProxy(ds *m.DataSource, plugin *plugins.DataSourcePlugin, ctx *m.ReqContext, proxyPath string) *DataSourceProxy {
targetURL, _ := url.Parse(ds.Url)
return &DataSourceProxy{
ds: ds,
plugin: plugin,
ctx: ctx,
proxyPath: proxyPath,
targetUrl: targetURL,
}
}
func newHTTPClient() httpClient {
return &http.Client{
Timeout: time.Second * 30,
Transport: &http.Transport{Proxy: http.ProxyFromEnvironment},
}
}
func (proxy *DataSourceProxy) HandleRequest() {
if err := proxy.validateRequest(); err != nil {
proxy.ctx.JsonApiErr(403, err.Error(), nil)
return
}
reverseProxy := &httputil.ReverseProxy{
Director: proxy.getDirector(),
FlushInterval: time.Millisecond * 200,
}
var err error
reverseProxy.Transport, err = proxy.ds.GetHttpTransport()
if err != nil {
proxy.ctx.JsonApiErr(400, "Unable to load TLS certificate", err)
return
}
proxy.logRequest()
span, ctx := opentracing.StartSpanFromContext(proxy.ctx.Req.Context(), "datasource reverse proxy")
proxy.ctx.Req.Request = proxy.ctx.Req.WithContext(ctx)
defer span.Finish()
span.SetTag("datasource_id", proxy.ds.Id)
span.SetTag("datasource_type", proxy.ds.Type)
span.SetTag("user_id", proxy.ctx.SignedInUser.UserId)
span.SetTag("org_id", proxy.ctx.SignedInUser.OrgId)
proxy.addTraceFromHeaderValue(span, "X-Panel-Id", "panel_id")
proxy.addTraceFromHeaderValue(span, "X-Dashboard-Id", "dashboard_id")
opentracing.GlobalTracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(proxy.ctx.Req.Request.Header))
reverseProxy.ServeHTTP(proxy.ctx.Resp, proxy.ctx.Req.Request)
proxy.ctx.Resp.Header().Del("Set-Cookie")
}
func (proxy *DataSourceProxy) addTraceFromHeaderValue(span opentracing.Span, headerName string, tagName string) {
panelId := proxy.ctx.Req.Header.Get(headerName)
dashId, err := strconv.Atoi(panelId)
if err == nil {
span.SetTag(tagName, dashId)
}
}
func (proxy *DataSourceProxy) useCustomHeaders(req *http.Request) {
decryptSdj := proxy.ds.SecureJsonData.Decrypt()
index := 1
for {
headerNameSuffix := fmt.Sprintf("httpHeaderName%d", index)
headerValueSuffix := fmt.Sprintf("httpHeaderValue%d", index)
if key := proxy.ds.JsonData.Get(headerNameSuffix).MustString(); key != "" {
if val, ok := decryptSdj[headerValueSuffix]; ok {
// remove if exists
if req.Header.Get(key) != "" {
req.Header.Del(key)
}
req.Header.Add(key, val)
logger.Debug("Using custom header ", "CustomHeaders", key)
}
} else {
break
}
index += 1
}
}
func (proxy *DataSourceProxy) getDirector() func(req *http.Request) {
return func(req *http.Request) {
req.URL.Scheme = proxy.targetUrl.Scheme
req.URL.Host = proxy.targetUrl.Host
req.Host = proxy.targetUrl.Host
reqQueryVals := req.URL.Query()
if proxy.ds.Type == m.DS_INFLUXDB_08 {
req.URL.Path = util.JoinUrlFragments(proxy.targetUrl.Path, "db/"+proxy.ds.Database+"/"+proxy.proxyPath)
reqQueryVals.Add("u", proxy.ds.User)
reqQueryVals.Add("p", proxy.ds.Password)
req.URL.RawQuery = reqQueryVals.Encode()
} else if proxy.ds.Type == m.DS_INFLUXDB {
req.URL.Path = util.JoinUrlFragments(proxy.targetUrl.Path, proxy.proxyPath)
req.URL.RawQuery = reqQueryVals.Encode()
if !proxy.ds.BasicAuth {
req.Header.Del("Authorization")
req.Header.Add("Authorization", util.GetBasicAuthHeader(proxy.ds.User, proxy.ds.Password))
}
} else {
req.URL.Path = util.JoinUrlFragments(proxy.targetUrl.Path, proxy.proxyPath)
}
if proxy.ds.BasicAuth {
req.Header.Del("Authorization")
req.Header.Add("Authorization", util.GetBasicAuthHeader(proxy.ds.BasicAuthUser, proxy.ds.BasicAuthPassword))
}
// Lookup and use custom headers
if proxy.ds.SecureJsonData != nil {
proxy.useCustomHeaders(req)
}
dsAuth := req.Header.Get("X-DS-Authorization")
if len(dsAuth) > 0 {
req.Header.Del("X-DS-Authorization")
req.Header.Del("Authorization")
req.Header.Add("Authorization", dsAuth)
}
// clear cookie header, except for whitelisted cookies
var keptCookies []*http.Cookie
if proxy.ds.JsonData != nil {
if keepCookies := proxy.ds.JsonData.Get("keepCookies"); keepCookies != nil {
keepCookieNames := keepCookies.MustStringArray()
for _, c := range req.Cookies() {
for _, v := range keepCookieNames {
if c.Name == v {
keptCookies = append(keptCookies, c)
}
}
}
}
}
req.Header.Del("Cookie")
for _, c := range keptCookies {
req.AddCookie(c)
}
// clear X-Forwarded Host/Port/Proto headers
req.Header.Del("X-Forwarded-Host")
req.Header.Del("X-Forwarded-Port")
req.Header.Del("X-Forwarded-Proto")
req.Header.Set("User-Agent", fmt.Sprintf("Grafana/%s", setting.BuildVersion))
// Clear Origin and Referer to avoir CORS issues
req.Header.Del("Origin")
req.Header.Del("Referer")
// set X-Forwarded-For header
if req.RemoteAddr != "" {
remoteAddr, _, err := net.SplitHostPort(req.RemoteAddr)
if err != nil {
remoteAddr = req.RemoteAddr
}
if req.Header.Get("X-Forwarded-For") != "" {
req.Header.Set("X-Forwarded-For", req.Header.Get("X-Forwarded-For")+", "+remoteAddr)
} else {
req.Header.Set("X-Forwarded-For", remoteAddr)
}
}
if proxy.route != nil {
ApplyRoute(proxy.ctx.Req.Context(), req, proxy.proxyPath, proxy.route, proxy.ds)
}
}
}
func (proxy *DataSourceProxy) validateRequest() error {
if !checkWhiteList(proxy.ctx, proxy.targetUrl.Host) {
return errors.New("Target url is not a valid target")
}
if proxy.ds.Type == m.DS_PROMETHEUS {
if proxy.ctx.Req.Request.Method == "DELETE" {
return errors.New("Deletes not allowed on proxied Prometheus datasource")
}
if proxy.ctx.Req.Request.Method == "PUT" {
return errors.New("Puts not allowed on proxied Prometheus datasource")
}
if proxy.ctx.Req.Request.Method == "POST" && !(proxy.proxyPath == "api/v1/query" || proxy.proxyPath == "api/v1/query_range") {
return errors.New("Posts not allowed on proxied Prometheus datasource except on /query and /query_range")
}
}
if proxy.ds.Type == m.DS_ES {
if proxy.ctx.Req.Request.Method == "DELETE" {
return errors.New("Deletes not allowed on proxied Elasticsearch datasource")
}
if proxy.ctx.Req.Request.Method == "PUT" {
return errors.New("Puts not allowed on proxied Elasticsearch datasource")
}
if proxy.ctx.Req.Request.Method == "POST" && proxy.proxyPath != "_msearch" {
return errors.New("Posts not allowed on proxied Elasticsearch datasource except on /_msearch")
}
}
// found route if there are any
if len(proxy.plugin.Routes) > 0 {
for _, route := range proxy.plugin.Routes {
// method match
if route.Method != "" && route.Method != "*" && route.Method != proxy.ctx.Req.Method {
continue
}
if route.ReqRole.IsValid() {
if !proxy.ctx.HasUserRole(route.ReqRole) {
return errors.New("Plugin proxy route access denied")
}
}
if strings.HasPrefix(proxy.proxyPath, route.Path) {
proxy.route = route
break
}
}
}
return nil
}
func (proxy *DataSourceProxy) logRequest() {
if !setting.DataProxyLogging {
return
}
var body string
if proxy.ctx.Req.Request.Body != nil {
buffer, err := ioutil.ReadAll(proxy.ctx.Req.Request.Body)
if err == nil {
proxy.ctx.Req.Request.Body = ioutil.NopCloser(bytes.NewBuffer(buffer))
body = string(buffer)
}
}
logger.Info("Proxying incoming request",
"userid", proxy.ctx.UserId,
"orgid", proxy.ctx.OrgId,
"username", proxy.ctx.Login,
"datasource", proxy.ds.Type,
"uri", proxy.ctx.Req.RequestURI,
"method", proxy.ctx.Req.Request.Method,
"body", body)
}
func checkWhiteList(c *m.ReqContext, host string) bool {
if host != "" && len(setting.DataProxyWhiteList) > 0 {
if _, exists := setting.DataProxyWhiteList[host]; !exists {
c.JsonApiErr(403, "Data proxy hostname and ip are not included in whitelist", nil)
return false
}
}
return true
}