lib/controller/federation.go

   1 // Copyright (C) The Arvados Authors. All rights reserved.
   2 //
   3 // SPDX-License-Identifier: AGPL-3.0
   4
   5 package controller
   6
   7 import (
   8         "bytes"
   9         "database/sql"
  10         "fmt"
  11         "io"
  12         "io/ioutil"
  13         "net/http"
  14         "net/url"
  15         "regexp"
  16         "strings"
  17
  18         "git.curoverse.com/arvados.git/sdk/go/arvados"
  19         "git.curoverse.com/arvados.git/sdk/go/auth"
  20 )
  21
  22 var pathPattern = `^/arvados/v1/%s(/([0-9a-z]{5})-%s-[0-9a-z]{15})?(.*)$`
  23 var wfRe = regexp.MustCompile(fmt.Sprintf(pathPattern, "workflows", "7fd4e"))
  24 var containersRe = regexp.MustCompile(fmt.Sprintf(pathPattern, "containers", "dz642"))
  25 var containerRequestsRe = regexp.MustCompile(fmt.Sprintf(pathPattern, "container_requests", "xvhdp"))
  26 var collectionRe = regexp.MustCompile(fmt.Sprintf(pathPattern, "collections", "4zz18"))
  27 var collectionByPDHRe = regexp.MustCompile(`^/arvados/v1/collections/([0-9a-fA-F]{32}\+[0-9]+)+$`)
  28
  29 func (h *Handler) remoteClusterRequest(remoteID string, req *http.Request) (*http.Response, error) {
  30         remote, ok := h.Cluster.RemoteClusters[remoteID]
  31         if !ok {
  32                 return nil, HTTPError{fmt.Sprintf("no proxy available for cluster %v", remoteID), http.StatusNotFound}
  33         }
  34         scheme := remote.Scheme
  35         if scheme == "" {
  36                 scheme = "https"
  37         }
  38         saltedReq, err := h.saltAuthToken(req, remoteID)
  39         if err != nil {
  40                 return nil, err
  41         }
  42         urlOut := &url.URL{
  43                 Scheme:   scheme,
  44                 Host:     remote.Host,
  45                 Path:     saltedReq.URL.Path,
  46                 RawPath:  saltedReq.URL.RawPath,
  47                 RawQuery: saltedReq.URL.RawQuery,
  48         }
  49         client := h.secureClient
  50         if remote.Insecure {
  51                 client = h.insecureClient
  52         }
  53         return h.proxy.ForwardRequest(saltedReq, urlOut, client)
  54 }
  55
  56 // Buffer request body, parse form parameters in request, and then
  57 // replace original body with the buffer so it can be re-read by
  58 // downstream proxy steps.
  59 func loadParamsFromForm(req *http.Request) error {
  60         var postBody *bytes.Buffer
  61         if req.Body != nil && req.Header.Get("Content-Type") == "application/x-www-form-urlencoded" {
  62                 var cl int64
  63                 if req.ContentLength > 0 {
  64                         cl = req.ContentLength
  65                 }
  66                 postBody = bytes.NewBuffer(make([]byte, 0, cl))
  67                 originalBody := req.Body
  68                 defer originalBody.Close()
  69                 req.Body = ioutil.NopCloser(io.TeeReader(req.Body, postBody))
  70         }
  71
  72         err := req.ParseForm()
  73         if err != nil {
  74                 return err
  75         }
  76
  77         if req.Body != nil && postBody != nil {
  78                 req.Body = ioutil.NopCloser(postBody)
  79         }
  80         return nil
  81 }
  82
  83 func (h *Handler) setupProxyRemoteCluster(next http.Handler) http.Handler {
  84         mux := http.NewServeMux()
  85         mux.Handle("/arvados/v1/workflows", &genericFederatedRequestHandler{next, h, wfRe})
  86         mux.Handle("/arvados/v1/workflows/", &genericFederatedRequestHandler{next, h, wfRe})
  87         mux.Handle("/arvados/v1/containers", &genericFederatedRequestHandler{next, h, containersRe})
  88         mux.Handle("/arvados/v1/containers/", &genericFederatedRequestHandler{next, h, containersRe})
  89         mux.Handle("/arvados/v1/container_requests", &genericFederatedRequestHandler{next, h, containerRequestsRe})
  90         mux.Handle("/arvados/v1/container_requests/", &genericFederatedRequestHandler{next, h, containerRequestsRe})
  91         mux.Handle("/arvados/v1/collections", next)
  92         mux.Handle("/arvados/v1/collections/", &collectionFederatedRequestHandler{next, h})
  93         mux.Handle("/", next)
  94
  95         return http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
  96                 parts := strings.Split(req.Header.Get("Authorization"), "/")
  97                 alreadySalted := (len(parts) == 3 && parts[0] == "Bearer v2" && len(parts[2]) == 40)
  98
  99                 if alreadySalted ||
 100                         strings.Index(req.Header.Get("Via"), "arvados-controller") != -1 {
 101                         // The token is already salted, or this is a
 102                         // request from another instance of
 103                         // arvados-controller.  In either case, we
 104                         // don't want to proxy this query, so just
 105                         // continue down the instance handler stack.
 106                         next.ServeHTTP(w, req)
 107                         return
 108                 }
 109
 110                 mux.ServeHTTP(w, req)
 111         })
 112
 113         return mux
 114 }
 115
 116 type CurrentUser struct {
 117         Authorization arvados.APIClientAuthorization
 118         UUID          string
 119 }
 120
 121 func (h *Handler) validateAPItoken(req *http.Request, user *CurrentUser) error {
 122         db, err := h.db(req)
 123         if err != nil {
 124                 return err
 125         }
 126         return db.QueryRowContext(req.Context(), `SELECT api_client_authorizations.uuid, users.uuid FROM api_client_authorizations JOIN users on api_client_authorizations.user_id=users.id WHERE api_token=$1 AND (expires_at IS NULL OR expires_at > current_timestamp) LIMIT 1`, user.Authorization.APIToken).Scan(&user.Authorization.UUID, &user.UUID)
 127 }
 128
 129 // Extract the auth token supplied in req, and replace it with a
 130 // salted token for the remote cluster.
 131 func (h *Handler) saltAuthToken(req *http.Request, remote string) (updatedReq *http.Request, err error) {
 132         updatedReq = (&http.Request{
 133                 Method:        req.Method,
 134                 URL:           req.URL,
 135                 Header:        req.Header,
 136                 Body:          req.Body,
 137                 ContentLength: req.ContentLength,
 138                 Host:          req.Host,
 139         }).WithContext(req.Context())
 140
 141         creds := auth.NewCredentials()
 142         creds.LoadTokensFromHTTPRequest(updatedReq)
 143         if len(creds.Tokens) == 0 && updatedReq.Header.Get("Content-Type") == "application/x-www-form-encoded" {
 144                 // Override ParseForm's 10MiB limit by ensuring
 145                 // req.Body is a *http.maxBytesReader.
 146                 updatedReq.Body = http.MaxBytesReader(nil, updatedReq.Body, 1<<28) // 256MiB. TODO: use MaxRequestSize from discovery doc or config.
 147                 if err := creds.LoadTokensFromHTTPRequestBody(updatedReq); err != nil {
 148                         return nil, err
 149                 }
 150                 // Replace req.Body with a buffer that re-encodes the
 151                 // form without api_token, in case we end up
 152                 // forwarding the request.
 153                 if updatedReq.PostForm != nil {
 154                         updatedReq.PostForm.Del("api_token")
 155                 }
 156                 updatedReq.Body = ioutil.NopCloser(bytes.NewBufferString(updatedReq.PostForm.Encode()))
 157         }
 158         if len(creds.Tokens) == 0 {
 159                 return updatedReq, nil
 160         }
 161
 162         token, err := auth.SaltToken(creds.Tokens[0], remote)
 163
 164         if err == auth.ErrObsoleteToken {
 165                 // If the token exists in our own database, salt it
 166                 // for the remote. Otherwise, assume it was issued by
 167                 // the remote, and pass it through unmodified.
 168                 currentUser := CurrentUser{Authorization: arvados.APIClientAuthorization{APIToken: creds.Tokens[0]}}
 169                 err = h.validateAPItoken(req, &currentUser)
 170                 if err == sql.ErrNoRows {
 171                         // Not ours; pass through unmodified.
 172                         token = currentUser.Authorization.APIToken
 173                 } else if err != nil {
 174                         return nil, err
 175                 } else {
 176                         // Found; make V2 version and salt it.
 177                         token, err = auth.SaltToken(currentUser.Authorization.TokenV2(), remote)
 178                         if err != nil {
 179                                 return nil, err
 180                         }
 181                 }
 182         } else if err != nil {
 183                 return nil, err
 184         }
 185         updatedReq.Header = http.Header{}
 186         for k, v := range req.Header {
 187                 if k != "Authorization" {
 188                         updatedReq.Header[k] = v
 189                 }
 190         }
 191         updatedReq.Header.Set("Authorization", "Bearer "+token)
 192
 193         // Remove api_token=... from the the query string, in case we
 194         // end up forwarding the request.
 195         if values, err := url.ParseQuery(updatedReq.URL.RawQuery); err != nil {
 196                 return nil, err
 197         } else if _, ok := values["api_token"]; ok {
 198                 delete(values, "api_token")
 199                 updatedReq.URL = &url.URL{
 200                         Scheme:   req.URL.Scheme,
 201                         Host:     req.URL.Host,
 202                         Path:     req.URL.Path,
 203                         RawPath:  req.URL.RawPath,
 204                         RawQuery: values.Encode(),
 205                 }
 206         }
 207         return updatedReq, nil
 208 }