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check_response.go
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/
check_response.go
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package authorize
import (
"context"
"errors"
"io"
"net/http"
"net/http/httptest"
"net/url"
"sort"
"strings"
envoy_config_core_v3 "github.com/envoyproxy/go-control-plane/envoy/config/core/v3"
envoy_service_auth_v3 "github.com/envoyproxy/go-control-plane/envoy/service/auth/v3"
envoy_type_v3 "github.com/envoyproxy/go-control-plane/envoy/type/v3"
"github.com/golang/protobuf/ptypes/wrappers"
"github.com/tniswong/go.rfcx/rfc7231"
"google.golang.org/genproto/googleapis/rpc/status"
"google.golang.org/grpc/codes"
"github.com/pomerium/pomerium/authorize/evaluator"
"github.com/pomerium/pomerium/internal/httputil"
"github.com/pomerium/pomerium/internal/log"
"github.com/pomerium/pomerium/internal/telemetry/requestid"
"github.com/pomerium/pomerium/internal/urlutil"
)
func (a *Authorize) okResponse(reply *evaluator.Result) *envoy_service_auth_v3.CheckResponse {
var requestHeaders []*envoy_config_core_v3.HeaderValueOption
for k, vs := range reply.Headers {
requestHeaders = append(requestHeaders, mkHeader(k, strings.Join(vs, ","), false))
}
// ensure request headers are sorted by key for deterministic output
sort.Slice(requestHeaders, func(i, j int) bool {
return requestHeaders[i].Header.Key < requestHeaders[j].Header.Value
})
return &envoy_service_auth_v3.CheckResponse{
Status: &status.Status{Code: int32(codes.OK), Message: "OK"},
HttpResponse: &envoy_service_auth_v3.CheckResponse_OkResponse{
OkResponse: &envoy_service_auth_v3.OkHttpResponse{
Headers: requestHeaders,
},
},
}
}
func (a *Authorize) deniedResponse(
ctx context.Context,
in *envoy_service_auth_v3.CheckRequest,
code int32, reason string, headers map[string]string,
) (*envoy_service_auth_v3.CheckResponse, error) {
var details string
switch code {
case httputil.StatusInvalidClientCertificate:
details = httputil.StatusText(httputil.StatusInvalidClientCertificate)
case http.StatusForbidden:
details = http.StatusText(http.StatusForbidden)
default:
details = reason
}
// create a http response writer recorder
w := httptest.NewRecorder()
r := getHTTPRequestFromCheckRequest(in)
// build the user info / debug endpoint
debugEndpoint, _ := a.userInfoEndpointURL(in) // if there's an error, we just wont display it
// run the request through our go error handler
httpErr := httputil.HTTPError{
Status: int(code),
Err: errors.New(details),
DebugURL: debugEndpoint,
RequestID: requestid.FromContext(ctx),
}
httpErr.ErrorResponse(w, r)
// transpose the go http response writer into a envoy response
resp := w.Result()
defer resp.Body.Close()
respBody, err := io.ReadAll(resp.Body)
if err != nil {
log.Error(ctx).Err(err).Msg("error executing error template")
return nil, err
}
// convert go headers to envoy headers
respHeader := toEnvoyHeaders(resp.Header)
// add any additional headers
for k, v := range headers {
respHeader = append(respHeader, mkHeader(k, v, false))
}
return &envoy_service_auth_v3.CheckResponse{
Status: &status.Status{Code: int32(codes.PermissionDenied), Message: "Access Denied"},
HttpResponse: &envoy_service_auth_v3.CheckResponse_DeniedResponse{
DeniedResponse: &envoy_service_auth_v3.DeniedHttpResponse{
Status: &envoy_type_v3.HttpStatus{
Code: envoy_type_v3.StatusCode(code),
},
Headers: respHeader,
Body: string(respBody),
},
},
}, nil
}
func (a *Authorize) requireLoginResponse(ctx context.Context, in *envoy_service_auth_v3.CheckRequest) (*envoy_service_auth_v3.CheckResponse, error) {
opts := a.currentOptions.Load()
state := a.state.Load()
authenticateURL, err := opts.GetAuthenticateURL()
if err != nil {
return nil, err
}
if !shouldRedirect(in) {
return a.deniedResponse(ctx, in, http.StatusUnauthorized, http.StatusText(http.StatusUnauthorized), nil)
}
signinURL := authenticateURL.ResolveReference(&url.URL{
Path: "/.pomerium/sign_in",
})
q := signinURL.Query()
// always assume https scheme
url := getCheckRequestURL(in)
url.Scheme = "https"
q.Set(urlutil.QueryRedirectURI, url.String())
signinURL.RawQuery = q.Encode()
redirectTo := urlutil.NewSignedURL(state.sharedKey, signinURL).String()
return a.deniedResponse(ctx, in, http.StatusFound, "Login", map[string]string{
"Location": redirectTo,
})
}
func mkHeader(k, v string, shouldAppend bool) *envoy_config_core_v3.HeaderValueOption {
return &envoy_config_core_v3.HeaderValueOption{
Header: &envoy_config_core_v3.HeaderValue{
Key: k,
Value: v,
},
Append: &wrappers.BoolValue{
Value: shouldAppend,
},
}
}
func toEnvoyHeaders(headers http.Header) []*envoy_config_core_v3.HeaderValueOption {
var ks []string
for k := range headers {
ks = append(ks, k)
}
sort.Strings(ks)
envoyHeaders := make([]*envoy_config_core_v3.HeaderValueOption, 0, len(headers))
for _, k := range ks {
envoyHeaders = append(envoyHeaders, mkHeader(k, headers.Get(k), false))
}
return envoyHeaders
}
// userInfoEndpointURL returns the user info endpoint url which can be used to debug the user's
// session that lives on the authenticate service.
func (a *Authorize) userInfoEndpointURL(in *envoy_service_auth_v3.CheckRequest) (*url.URL, error) {
opts := a.currentOptions.Load()
authenticateURL, err := opts.GetAuthenticateURL()
if err != nil {
return nil, err
}
debugEndpoint := authenticateURL.ResolveReference(&url.URL{Path: "/.pomerium/"})
r := getHTTPRequestFromCheckRequest(in)
redirectURL := urlutil.GetAbsoluteURL(r).String()
if ref := r.Header.Get(httputil.HeaderReferrer); ref != "" {
redirectURL = ref
}
debugEndpoint = debugEndpoint.ResolveReference(&url.URL{
RawQuery: url.Values{
urlutil.QueryRedirectURI: {redirectURL},
}.Encode(),
})
return urlutil.NewSignedURL(a.state.Load().sharedKey, debugEndpoint).Sign(), nil
}
func shouldRedirect(in *envoy_service_auth_v3.CheckRequest) bool {
requestHeaders := in.GetAttributes().GetRequest().GetHttp().GetHeaders()
if requestHeaders == nil {
return true
}
if strings.HasPrefix(requestHeaders["content-type"], "application/grpc") {
return false
}
a, err := rfc7231.ParseAccept(requestHeaders["accept"])
if err != nil {
return true
}
mediaType, ok := a.MostAcceptable([]string{
"text/html",
"application/json",
"text/plain",
"application/grpc-web-text",
"application/grpc-web+proto",
"application/grpc+proto",
})
if !ok {
return true
}
return mediaType == "text/html"
}