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dataproxy.go
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dataproxy.go
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package api
import (
"bytes"
"io/ioutil"
"net/http"
"net/http/httputil"
"net/url"
"strings"
"time"
"github.com/grafana/grafana/pkg/api/cloudwatch"
"github.com/grafana/grafana/pkg/bus"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/metrics"
"github.com/grafana/grafana/pkg/middleware"
m "github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/util"
)
var (
dataproxyLogger log.Logger = log.New("data-proxy-log")
)
func NewReverseProxy(ds *m.DataSource, proxyPath string, targetUrl *url.URL) *httputil.ReverseProxy {
director := func(req *http.Request) {
req.URL.Scheme = targetUrl.Scheme
req.URL.Host = targetUrl.Host
req.Host = targetUrl.Host
reqQueryVals := req.URL.Query()
if ds.Type == m.DS_INFLUXDB_08 {
req.URL.Path = util.JoinUrlFragments(targetUrl.Path, "db/"+ds.Database+"/"+proxyPath)
reqQueryVals.Add("u", ds.User)
reqQueryVals.Add("p", ds.Password)
req.URL.RawQuery = reqQueryVals.Encode()
} else if ds.Type == m.DS_INFLUXDB {
req.URL.Path = util.JoinUrlFragments(targetUrl.Path, proxyPath)
req.URL.RawQuery = reqQueryVals.Encode()
if !ds.BasicAuth {
req.Header.Del("Authorization")
req.Header.Add("Authorization", util.GetBasicAuthHeader(ds.User, ds.Password))
}
} else {
req.URL.Path = util.JoinUrlFragments(targetUrl.Path, proxyPath)
}
if ds.BasicAuth {
req.Header.Del("Authorization")
req.Header.Add("Authorization", util.GetBasicAuthHeader(ds.BasicAuthUser, ds.BasicAuthPassword))
}
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 headers
req.Header.Del("Cookie")
req.Header.Del("Set-Cookie")
}
return &httputil.ReverseProxy{Director: director, FlushInterval: time.Millisecond * 200}
}
func getDatasource(id int64, orgId int64) (*m.DataSource, error) {
query := m.GetDataSourceByIdQuery{Id: id, OrgId: orgId}
if err := bus.Dispatch(&query); err != nil {
return nil, err
}
return query.Result, nil
}
func ProxyDataSourceRequest(c *middleware.Context) {
c.TimeRequest(metrics.M_DataSource_ProxyReq_Timer)
ds, err := getDatasource(c.ParamsInt64(":id"), c.OrgId)
if err != nil {
c.JsonApiErr(500, "Unable to load datasource meta data", err)
return
}
if ds.Type == m.DS_CLOUDWATCH {
cloudwatch.HandleRequest(c, ds)
return
}
if ds.Type == m.DS_INFLUXDB {
if c.Query("db") != ds.Database {
c.JsonApiErr(403, "Datasource is not configured to allow this database", nil)
return
}
}
targetUrl, _ := url.Parse(ds.Url)
if len(setting.DataProxyWhiteList) > 0 {
if _, exists := setting.DataProxyWhiteList[targetUrl.Host]; !exists {
c.JsonApiErr(403, "Data proxy hostname and ip are not included in whitelist", nil)
return
}
}
proxyPath := c.Params("*")
if ds.Type == m.DS_PROMETHEUS {
if c.Req.Request.Method != http.MethodGet || !strings.HasPrefix(proxyPath, "api/") {
c.JsonApiErr(403, "GET is only allowed on proxied Prometheus datasource", nil)
return
}
}
if ds.Type == m.DS_ES {
if c.Req.Request.Method == "DELETE" {
c.JsonApiErr(403, "Deletes not allowed on proxied Elasticsearch datasource", nil)
return
}
if c.Req.Request.Method == "PUT" {
c.JsonApiErr(403, "Puts not allowed on proxied Elasticsearch datasource", nil)
return
}
if c.Req.Request.Method == "POST" && proxyPath != "_msearch" {
c.JsonApiErr(403, "Posts not allowed on proxied Elasticsearch datasource except on /_msearch", nil)
return
}
}
proxy := NewReverseProxy(ds, proxyPath, targetUrl)
proxy.Transport, err = ds.GetHttpTransport()
if err != nil {
c.JsonApiErr(400, "Unable to load TLS certificate", err)
return
}
logProxyRequest(ds.Type, c)
proxy.ServeHTTP(c.Resp, c.Req.Request)
c.Resp.Header().Del("Set-Cookie")
}
func logProxyRequest(dataSourceType string, c *middleware.Context) {
if !setting.DataProxyLogging {
return
}
var body string
if c.Req.Request.Body != nil {
buffer, err := ioutil.ReadAll(c.Req.Request.Body)
if err == nil {
c.Req.Request.Body = ioutil.NopCloser(bytes.NewBuffer(buffer))
body = string(buffer)
}
}
dataproxyLogger.Info("Proxying incoming request",
"userid", c.UserId,
"orgid", c.OrgId,
"username", c.Login,
"datasource", dataSourceType,
"uri", c.Req.RequestURI,
"method", c.Req.Request.Method,
"body", body)
}