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package main
import (
"encoding/json"
"fmt"
"io"
"net/http"
"net/http/httputil"
"github.com/cloudflare/cfssl/api"
"github.com/cloudflare/cfssl/auth"
"github.com/cloudflare/cfssl/helpers"
"github.com/cloudflare/cfssl/log"
"github.com/cloudflare/cfssl/signer"
"github.com/cloudflare/cfssl/whitelist"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
// A SignatureResponse contains only a certificate, as there is no other
// useful data for the CA to return at this time.
type SignatureResponse struct {
Certificate string `json:"certificate"`
}
type filter func(string, *signer.SignRequest) bool
var filters = map[string][]filter{}
var (
requests = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "requests_total",
Help: "How many requests for each operation type and signer were succesfully processed.",
},
[]string{"operation", "signer"},
)
erroredRequests = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "requests_errored_total",
Help: "How many requests for each operation type resulted in an error.",
},
[]string{"operation", "signer"},
)
badInputs = promauto.NewCounterVec(
prometheus.CounterOpts{
Name: "bad_inputs_total",
Help: "How many times the input was malformed or not allowed.",
},
[]string{"operation"},
)
)
const (
signOperation = "sign"
)
func fail(w http.ResponseWriter, req *http.Request, status, code int, msg, ad string) {
badInputs.WithLabelValues(signOperation).Inc()
if ad != "" {
ad = " (" + ad + ")"
}
log.Errorf("[HTTP %d] %d - %s%s", status, code, msg, ad)
dumpReq, err := httputil.DumpRequest(req, true)
if err != nil {
fmt.Printf("%v#v\n", req)
} else {
fmt.Printf("%s\n", dumpReq)
}
res := api.NewErrorResponse(msg, code)
w.WriteHeader(status)
jenc := json.NewEncoder(w)
jenc.Encode(res)
}
func dispatchRequest(w http.ResponseWriter, req *http.Request) {
if req.Method != "POST" {
fail(w, req, http.StatusMethodNotAllowed, 1, "only POST is permitted", "")
return
}
defer req.Body.Close()
body, err := io.ReadAll(req.Body)
if err != nil {
fail(w, req, http.StatusInternalServerError, 1, err.Error(), "while reading request body")
return
}
var authReq auth.AuthenticatedRequest
err = json.Unmarshal(body, &authReq)
if err != nil {
fail(w, req, http.StatusBadRequest, 1, err.Error(), "while unmarshaling request body")
return
}
var sigRequest signer.SignRequest
err = json.Unmarshal(authReq.Request, &sigRequest)
if err != nil {
fail(w, req, http.StatusBadRequest, 1, err.Error(), "while unmarshalling authenticated request")
return
}
if sigRequest.Label == "" {
sigRequest.Label = defaultLabel
}
acl := whitelists[sigRequest.Label]
if acl != nil {
ip, err := whitelist.HTTPRequestLookup(req)
if err != nil {
fail(w, req, http.StatusInternalServerError, 1, err.Error(), "while getting request IP")
return
}
if !acl.Permitted(ip) {
fail(w, req, http.StatusForbidden, 1, "not authorised", "because IP is not whitelisted")
return
}
}
s, ok := signers[sigRequest.Label]
if !ok {
fail(w, req, http.StatusBadRequest, 1, "bad request", "request is for non-existent label "+sigRequest.Label)
return
}
requests.WithLabelValues(signOperation, sigRequest.Label).Inc()
// Sanity checks to ensure that we have a valid policy. This
// should have been checked in NewAuthSignHandler.
policy := s.Policy()
if policy == nil {
fail(w, req, http.StatusInternalServerError, 1, "invalid policy", "signer was initialised without a signing policy")
return
}
profile := policy.Default
if policy.Profiles != nil && sigRequest.Profile != "" {
profile = policy.Profiles[sigRequest.Profile]
if profile == nil {
fail(w, req, http.StatusBadRequest, 1, "invalid profile", "failed to look up profile with name: "+sigRequest.Profile)
return
}
}
if profile == nil {
fail(w, req, http.StatusInternalServerError, 1, "invalid profile", "signer was initialised without any valid profiles")
return
}
if profile.Provider == nil {
fail(w, req, http.StatusUnauthorized, 1, "authorisation required", "received unauthenticated request")
return
}
validAuth := false
if profile.Provider.Verify(&authReq) {
validAuth = true
} else if profile.PrevProvider != nil && profile.PrevProvider.Verify(&authReq) {
validAuth = true
}
if !validAuth {
fail(w, req, http.StatusBadRequest, 1, "invalid token", "received authenticated request with invalid token")
return
}
if sigRequest.Request == "" {
fail(w, req, http.StatusBadRequest, 1, "invalid request", "empty request")
return
}
cert, err := s.Sign(sigRequest)
if err != nil {
erroredRequests.WithLabelValues(signOperation, sigRequest.Label).Inc()
fail(w, req, http.StatusBadRequest, 1, "bad request", "signature failed: "+err.Error())
return
}
x509Cert, err := helpers.ParseCertificatePEM(cert)
if err != nil {
erroredRequests.WithLabelValues(signOperation, sigRequest.Label).Inc()
fail(w, req, http.StatusInternalServerError, 1, "bad certificate", err.Error())
}
log.Infof("signature: requester=%s, label=%s, profile=%s, serialno=%s",
req.RemoteAddr, sigRequest.Label, sigRequest.Profile, x509Cert.SerialNumber)
res := api.NewSuccessResponse(&SignatureResponse{Certificate: string(cert)})
jenc := json.NewEncoder(w)
err = jenc.Encode(res)
if err != nil {
log.Errorf("error writing response: %v", err)
}
}
func metricsDisallowed(w http.ResponseWriter, req *http.Request) {
log.Warning("attempt to access metrics endpoint from external address ", req.RemoteAddr)
http.NotFound(w, req)
}
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