Re-process .well-known redirects with a recursive handler call rather than a 302 redirect (#24890)

* Re-process .well-known redirects with a recursive handler call rather than a 302 redirect

* Track when the RequestURI mismatches path (in a redirect) and add it to the audit log

* call cancelFunc

audit/entry_formatter.go

@@ -255,6 +255,10 @@ func (f *EntryFormatter) FormatRequest(ctx context.Context, in *logical.LogInput
 		},
 	}
 
+	if req.HTTPRequest != nil && req.HTTPRequest.RequestURI != req.Path {
+		reqEntry.Request.RequestURI = req.HTTPRequest.RequestURI
+	}
+
 	if !auth.IssueTime.IsZero() {
 		reqEntry.Auth.TokenIssueTime = auth.IssueTime.Format(time.RFC3339)
 	}
@@ -472,6 +476,10 @@ func (f *EntryFormatter) FormatResponse(ctx context.Context, in *logical.LogInpu
 		},
 	}
 
+	if req.HTTPRequest != nil && req.HTTPRequest.RequestURI != req.Path {
+		respEntry.Request.RequestURI = req.HTTPRequest.RequestURI
+	}
+
 	if auth.PolicyResults != nil {
 		respEntry.Auth.PolicyResults = &PolicyResults{
 			Allowed: auth.PolicyResults.Allowed,

audit/types.go

@@ -195,6 +195,7 @@ type Request struct {
 	WrapTTL                       int                    `json:"wrap_ttl,omitempty"`
 	Headers                       map[string][]string    `json:"headers,omitempty"`
 	ClientCertificateSerialNumber string                 `json:"client_certificate_serial_number,omitempty"`
+	RequestURI                    string                 `json:"request_uri,omitempty"`
 }
 
 type Response struct {

http/handler.go

@@ -347,7 +347,8 @@ func wrapGenericHandler(core *vault.Core, h http.Handler, props *vault.HandlerPr
 	// return an HTTP error here. This information is best effort.
 	hostname, _ := os.Hostname()
 
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+	var hf func(w http.ResponseWriter, r *http.Request)
+	hf = func(w http.ResponseWriter, r *http.Request) {
 		// This block needs to be here so that upon sending SIGHUP, custom response
 		// headers are also reloaded into the handlers.
 		var customHeaders map[string][]*logical.CustomHeader
@@ -422,16 +423,9 @@ func wrapGenericHandler(core *vault.Core, h http.Handler, props *vault.HandlerPr
 					core.Logger().Warn("error resolving potential API redirect", "error", err)
 				} else {
 					if redir != "" {
-						dest := url.URL{
-							Path:     redir,
-							RawQuery: r.URL.RawQuery,
-						}
-						w.Header().Set("Location", dest.String())
-						if r.Method == http.MethodGet || r.Proto == "HTTP/1.0" {
-							w.WriteHeader(http.StatusFound)
-						} else {
-							w.WriteHeader(http.StatusTemporaryRedirect)
-						}
+						newReq := r.Clone(ctx)
+						newReq.URL.Path = redir
+						hf(w, newReq)
 						cancelFunc()
 						return
 					}
@@ -487,7 +481,8 @@ func wrapGenericHandler(core *vault.Core, h http.Handler, props *vault.HandlerPr
 		h.ServeHTTP(nw, r)
 
 		cancelFunc()
-	})
+	}
+	return http.HandlerFunc(hf)
 }
 
 func WrapForwardedForHandler(h http.Handler, l *configutil.Listener) http.Handler {

http/logical.go

@@ -110,10 +110,8 @@ func buildLogicalRequestNoAuth(perfStandby bool, ra *vault.RouterAccess, w http.
 		// add the HTTP request to the logical request object for later consumption.
 		contentType := r.Header.Get("Content-Type")
 
-		if ra != nil && ra.IsBinaryPath(r.Context(), path) {
-			passHTTPReq = true
-			origBody = r.Body
-		} else if path == "sys/storage/raft/snapshot" || path == "sys/storage/raft/snapshot-force" {
+		if (ra != nil && ra.IsBinaryPath(r.Context(), path)) ||
+			path == "sys/storage/raft/snapshot" || path == "sys/storage/raft/snapshot-force" {
 			passHTTPReq = true
 			origBody = r.Body
 		} else {
@@ -194,6 +192,11 @@ func buildLogicalRequestNoAuth(perfStandby bool, ra *vault.RouterAccess, w http.
 		return nil, nil, http.StatusMethodNotAllowed, nil
 	}
 
+	// RFC 5785 Redirect, keep the request for auditing purposes
+	if r.URL.Path != r.RequestURI {
+		passHTTPReq = true
+	}
+
 	requestId, err := uuid.GenerateUUID()
 	if err != nil {
 		return nil, nil, http.StatusInternalServerError, fmt.Errorf("failed to generate identifier for the request: %w", err)

vault/external_tests/router/router_ext_test.go

@@ -6,8 +6,12 @@ package router
 import (
 	"context"
 	"net/http"
+	"strings"
 	"testing"
 
+	"github.com/hashicorp/vault/audit"
+	"github.com/hashicorp/vault/helper/testhelpers/corehelpers"
+
 	"github.com/hashicorp/vault/helper/testhelpers"
 	vaulthttp "github.com/hashicorp/vault/http"
 
@@ -90,7 +94,11 @@ func TestRouter_UnmountRollbackIsntFatal(t *testing.T) {
 }
 
 func TestWellKnownRedirect_HA(t *testing.T) {
+	var records *[][]byte
 	cluster := vault.NewTestCluster(t, &vault.CoreConfig{
+		AuditBackends: map[string]audit.Factory{
+			"noop": corehelpers.NoopAuditFactory(&records),
+		},
 		DisablePerformanceStandby: true,
 		LogicalBackends: map[string]logical.Factory{
 			"noop": func(_ context.Context, _ *logical.BackendConfig) (logical.Backend, error) {
@@ -114,6 +122,12 @@ func TestWellKnownRedirect_HA(t *testing.T) {
 	standbys := testhelpers.DeriveStandbyCores(t, cluster)
 	standby := standbys[0].Client
 
+	if err := active.Client.Sys().EnableAuditWithOptions("noop", &api.EnableAuditOptions{
+		Type: "noop",
+	}); err != nil {
+		t.Fatalf("failed to enable audit: %v", err)
+	}
+
 	if err := active.Client.Sys().Mount("noop", &api.MountInput{
 		Type: "noop",
 	}); err != nil {
@@ -143,4 +157,15 @@ func TestWellKnownRedirect_HA(t *testing.T) {
 	} else if resp2.StatusCode != http.StatusOK {
 		t.Fatal("did not get expected response from noop backend after redirect")
 	}
+
+	if len(*records) < 2 {
+		t.Fatal("audit entries not populated")
+	} else {
+		rs := *records
+		// Make sure RequestURI is present in the redirect audit entries
+		if !strings.Contains(string(rs[len(rs)-1]), "request_uri\":\"/.well-known/foo/baz") ||
+			!strings.Contains(string(rs[len(rs)-2]), "request_uri\":\"/.well-known/foo/baz") {
+			t.Fatal("did not find request_uri in audit entries")
+		}
+	}
 }