/
grpc.go
174 lines (153 loc) · 5.14 KB
/
grpc.go
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package authorize
import (
"context"
"io"
"net/http"
"net/url"
"strings"
envoy_service_auth_v3 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v3"
"github.com/pomerium/pomerium/authorize/evaluator"
"github.com/pomerium/pomerium/config"
"github.com/pomerium/pomerium/internal/log"
"github.com/pomerium/pomerium/internal/sessions"
"github.com/pomerium/pomerium/internal/telemetry/requestid"
"github.com/pomerium/pomerium/internal/telemetry/trace"
"github.com/pomerium/pomerium/internal/urlutil"
"github.com/pomerium/pomerium/pkg/contextutil"
"github.com/pomerium/pomerium/pkg/grpc/user"
"github.com/pomerium/pomerium/pkg/storage"
)
// Check implements the envoy auth server gRPC endpoint.
func (a *Authorize) Check(ctx context.Context, in *envoy_service_auth_v3.CheckRequest) (*envoy_service_auth_v3.CheckResponse, error) {
ctx, span := trace.StartSpan(ctx, "authorize.grpc.Check")
defer span.End()
querier := storage.NewTracingQuerier(
storage.NewCachingQuerier(
storage.NewCachingQuerier(
storage.NewQuerier(a.state.Load().dataBrokerClient),
a.globalCache,
),
storage.NewLocalCache(),
),
)
ctx = storage.WithQuerier(ctx, querier)
state := a.state.Load()
// convert the incoming envoy-style http request into a go-style http request
hreq := getHTTPRequestFromCheckRequest(in)
ctx = requestid.WithValue(ctx, requestid.FromHTTPHeader(hreq.Header))
sessionState, _ := state.sessionStore.LoadSessionState(hreq)
var s sessionOrServiceAccount
var u *user.User
var err error
if sessionState != nil {
s, err = a.getDataBrokerSessionOrServiceAccount(ctx, sessionState.ID, sessionState.DatabrokerRecordVersion)
if err != nil {
log.Warn(ctx).Err(err).Msg("clearing session due to missing session or service account")
sessionState = nil
}
}
if sessionState != nil && s != nil {
u, _ = a.getDataBrokerUser(ctx, s.GetUserId()) // ignore any missing user error
}
req, err := a.getEvaluatorRequestFromCheckRequest(in, sessionState)
if err != nil {
log.Warn(ctx).Err(err).Msg("error building evaluator request")
return nil, err
}
// take the state lock here so we don't update while evaluating
a.stateLock.RLock()
res, err := state.evaluator.Evaluate(ctx, req)
a.stateLock.RUnlock()
if err != nil {
log.Error(ctx).Err(err).Msg("error during OPA evaluation")
return nil, err
}
// if show error details is enabled, attach the policy evaluation traces
if req.Policy != nil && req.Policy.ShowErrorDetails {
ctx = contextutil.WithPolicyEvaluationTraces(ctx, res.Traces)
}
resp, err := a.handleResult(ctx, in, req, res)
if err != nil {
log.Error(ctx).Err(err).Str("request-id", requestid.FromContext(ctx)).Msg("grpc check ext_authz_error")
}
a.logAuthorizeCheck(ctx, in, resp, res, s, u)
return resp, err
}
func (a *Authorize) getEvaluatorRequestFromCheckRequest(
in *envoy_service_auth_v3.CheckRequest,
sessionState *sessions.State,
) (*evaluator.Request, error) {
requestURL := getCheckRequestURL(in)
req := &evaluator.Request{
HTTP: evaluator.NewRequestHTTP(
in.GetAttributes().GetRequest().GetHttp().GetMethod(),
requestURL,
getCheckRequestHeaders(in),
getPeerCertificate(in),
in.GetAttributes().GetSource().GetAddress().GetSocketAddress().GetAddress(),
),
}
if sessionState != nil {
req.Session = evaluator.RequestSession{
ID: sessionState.ID,
}
}
req.Policy = a.getMatchingPolicy(requestURL)
return req, nil
}
func (a *Authorize) getMatchingPolicy(requestURL url.URL) *config.Policy {
options := a.currentOptions.Load()
for _, p := range options.GetAllPolicies() {
if p.Matches(requestURL) {
return &p
}
}
return nil
}
func getHTTPRequestFromCheckRequest(req *envoy_service_auth_v3.CheckRequest) *http.Request {
hattrs := req.GetAttributes().GetRequest().GetHttp()
u := getCheckRequestURL(req)
hreq := &http.Request{
Method: hattrs.GetMethod(),
URL: &u,
Header: make(http.Header),
Body: io.NopCloser(strings.NewReader(hattrs.GetBody())),
Host: hattrs.GetHost(),
RequestURI: hattrs.GetPath(),
}
for k, v := range getCheckRequestHeaders(req) {
hreq.Header.Set(k, v)
}
return hreq
}
func getCheckRequestHeaders(req *envoy_service_auth_v3.CheckRequest) map[string]string {
hdrs := make(map[string]string)
ch := req.GetAttributes().GetRequest().GetHttp().GetHeaders()
for k, v := range ch {
hdrs[http.CanonicalHeaderKey(k)] = v
}
return hdrs
}
func getCheckRequestURL(req *envoy_service_auth_v3.CheckRequest) url.URL {
h := req.GetAttributes().GetRequest().GetHttp()
u := url.URL{
Scheme: h.GetScheme(),
Host: h.GetHost(),
}
u.Host = urlutil.GetDomainsForURL(&u)[0]
// envoy sends the query string as part of the path
path := h.GetPath()
if idx := strings.Index(path, "?"); idx != -1 {
u.RawPath, u.RawQuery = path[:idx], path[idx+1:]
} else {
u.RawPath = path
}
u.Path, _ = url.PathUnescape(u.RawPath)
return u
}
// getPeerCertificate gets the PEM-encoded peer certificate from the check request
func getPeerCertificate(in *envoy_service_auth_v3.CheckRequest) string {
// ignore the error as we will just return the empty string in that case
cert, _ := url.QueryUnescape(in.GetAttributes().GetSource().GetCertificate())
return cert
}