reject status_request_v2 ocsp-multi staples that bundle multiple SingleResponses

gasbytes · gasbytes · commit e8653a82701b · 2026-07-10T18:56:51.000+02:00
So a revoked certificate's non-first single can no longer be accepted
diff --git a/doc/dox_comments/header_files/ssl.h b/doc/dox_comments/header_files/ssl.h
@@ -5681,6 +5681,11 @@ long wolfSSL_set_tlsext_status_ocsp_resp(WOLFSSL *ssl, unsigned char *resp, int
     wolfSSL. The application must not free the buffer after calling this
     function.
 
+    Each stapled response (one per certificate) must carry exactly one
+    SingleResponse. A BasicOCSPResponse bundling more than one SingleResponse
+    is rejected by the peer, so responders must supply a separate response per
+    certificate rather than combining statuses into a single response.
+
     \param ssl The WOLFSSL session.
     \param resp Pointer to the response buffer.
     \param len  Length of the response buffer.
diff --git a/src/internal.c b/src/internal.c
@@ -17953,6 +17953,11 @@ static int DoCertificateStatus(WOLFSSL* ssl, byte* input, word32* inOutIdx,
                     ||  (response->single->status->status != CERT_GOOD))
                         ret = BAD_CERTIFICATE_STATUS_ERROR;
 
+                    /* Bundling more than one SingleResponse inside a single
+                     * stapled BasicOCSPResponse is not supported. */
+                    if (ret == 0 && response->single->next != NULL)
+                        ret = BAD_CERTIFICATE_STATUS_ERROR;
+
                     if (ret == 0) {
                         request = (OcspRequest*)TLSX_CSR2_GetRequest(
                                 ssl->extensions, status_type, idx);
diff --git a/tests/api.c b/tests/api.c
@@ -35604,6 +35604,7 @@ TEST_CASE testCases[] = {
     TEST_DECL(test_ocsp_certid_dup),
     TEST_DECL(test_ocsp_resp_find_status_serial_prefix),
     TEST_DECL(test_ocsp_tls_cert_cb),
+    TEST_DECL(test_ocsp_status_request_v2_multi_revoked_single),
     TEST_DECL(test_ocsp_cert_unknown_crl_fallback),
     TEST_DECL(test_ocsp_cert_unknown_crl_fallback_nonleaf),
     TEST_DECL(test_tls13_nonblock_ocsp_low_mfl),
diff --git a/tests/api/create_ocsp_test_blobs.py b/tests/api/create_ocsp_test_blobs.py
@@ -436,6 +436,32 @@ def create_bad_response(rd: dict) -> bytes:
             'responder_key': WOLFSSL_OCSP_CERT_PATH + 'intermediate1-ca-key.pem',
             'name': 'resp_server1_cert'
         },
+        {
+            # A single, validly-signed BasicOCSPResponse that bundles two
+            # SingleResponses: the first (wire order) is a benign CERT_GOOD entry
+            # for an unrelated serial, the second is the server1 leaf cert marked
+            # CERT_REVOKED.
+            # Signed by intermediate1, the legitimate issuer and
+            # authorized responder for server1.
+            'response_status': 0,
+            'signature_algorithm': signature_algorithm(),
+            'responder_by_name': True,
+            'responder_cert': WOLFSSL_OCSP_CERT_PATH + 'intermediate1-ca-cert.pem',
+            'responses': [
+                {
+                    'issuer_cert': WOLFSSL_OCSP_CERT_PATH + 'intermediate1-ca-cert.pem',
+                    'serial': 0x01,
+                    'status': CERT_GOOD
+                },
+                {
+                    'issuer_cert': WOLFSSL_OCSP_CERT_PATH + 'intermediate1-ca-cert.pem',
+                    'serial': 0x05,
+                    'status': CERT_REVOKED
+                }
+            ],
+            'responder_key': WOLFSSL_OCSP_CERT_PATH + 'intermediate1-ca-key.pem',
+            'name': 'resp_server1_revoked_good_first'
+        },
         {
             # Ancestor-issued responder; rejected by RFC 6960 4.2.2.2 enforcement
             'response_status': 0,
diff --git a/tests/api/test_ocsp.c b/tests/api/test_ocsp.c
@@ -1218,11 +1218,141 @@ int test_ocsp_tls_cert_cb(void)
     return EXPECT_RESULT();
 }
 
+#if defined(HAVE_CERTIFICATE_STATUS_REQUEST_V2) && !defined(WOLFSSL_NO_TLS12)
+/* Stapling for a 3-cert chain. The intermediate and root staples are the
+ * normal single-SingleResponse CERT_GOOD responses, but the leaf (idx 0)
+ * staple is resp_server1_revoked_good_first: one validly-signed
+ * BasicOCSPResponse that bundles a benign CERT_GOOD single FIRST and the
+ * server1 leaf cert's CERT_REVOKED single SECOND. */
+static int test_ocsp_revoked_multi_single_status_cb(WOLFSSL* ssl, void* ioCtx)
+{
+    byte* leaf_resp = NULL;
+    byte* int_resp = NULL;
+    byte* root_resp = NULL;
+    int ret = WOLFSSL_OCSP_STATUS_CB_ALERT_FATAL;
+    (void)ioCtx;
+    leaf_resp = (byte*)XMALLOC(sizeof(resp_server1_revoked_good_first), NULL,
+            DYNAMIC_TYPE_TMP_BUFFER);
+    int_resp = (byte*)XMALLOC(sizeof(resp_intermediate1_cert), NULL,
+            DYNAMIC_TYPE_TMP_BUFFER);
+    root_resp = (byte*)XMALLOC(sizeof(resp_root_ca_cert), NULL,
+            DYNAMIC_TYPE_TMP_BUFFER);
+    if (leaf_resp != NULL && int_resp != NULL && root_resp != NULL) {
+        XMEMCPY(leaf_resp, resp_server1_revoked_good_first,
+                sizeof(resp_server1_revoked_good_first));
+        XMEMCPY(int_resp, resp_intermediate1_cert,
+                sizeof(resp_intermediate1_cert));
+        XMEMCPY(root_resp, resp_root_ca_cert, sizeof(resp_root_ca_cert));
+        if (wolfSSL_set_tlsext_status_ocsp_resp_multi(ssl, leaf_resp,
+                sizeof(resp_server1_revoked_good_first), 0) == WOLFSSL_SUCCESS)
+            leaf_resp = NULL;
+        if (wolfSSL_set_tlsext_status_ocsp_resp_multi(ssl, int_resp,
+                sizeof(resp_intermediate1_cert), 1) == WOLFSSL_SUCCESS)
+            int_resp = NULL;
+        if (wolfSSL_set_tlsext_status_ocsp_resp_multi(ssl, root_resp,
+                sizeof(resp_root_ca_cert), 2) == WOLFSSL_SUCCESS)
+            root_resp = NULL;
+        if (leaf_resp == NULL && int_resp == NULL && root_resp == NULL)
+            ret = WOLFSSL_OCSP_STATUS_CB_OK;
+    }
+    XFREE(leaf_resp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+    XFREE(int_resp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+    XFREE(root_resp, NULL, DYNAMIC_TYPE_TMP_BUFFER);
+    return ret;
+}
+
+/*
+ * status_request_v2 OCSP-multi must reject a stapled leaf response
+ * whose MATCHING SingleResponse is CERT_REVOKED, even when an unrelated
+ * CERT_GOOD SingleResponse appears first in the same BasicOCSPResponse.
+ */
+int test_ocsp_status_request_v2_multi_revoked_single(void)
+{
+    EXPECT_DECLS;
+    size_t i;
+    struct {
+        method_provider client_meth;
+        method_provider server_meth;
+        const char* tls_version;
+    } params[] = {
+        { wolfTLSv1_2_client_method, wolfTLSv1_2_server_method, "TLSv1_2" },
+#ifdef WOLFSSL_DTLS
+        { wolfDTLSv1_2_client_method, wolfDTLSv1_2_server_method, "DTLSv1_2" },
+#endif
+    };
+
+    for (i = 0; i < XELEM_CNT(params) && !EXPECT_FAIL(); i++) {
+        struct test_ssl_memio_ctx test_ctx;
+        WOLFSSL_ALERT_HISTORY h;
+
+        printf("\nTesting %s\n", params[i].tls_version);
+
+        XMEMSET(&test_ctx, 0, sizeof(test_ctx));
+        test_ctx.c_cb.caPemFile = "";
+        /* Server cert/key come only from the per-connection cert callback. */
+        test_ctx.s_cb.certPemFile = "";
+        test_ctx.s_cb.keyPemFile = "";
+        test_ctx.c_cb.method = params[i].client_meth;
+        test_ctx.s_cb.method = params[i].server_meth;
+
+        /* Full server1 -> intermediate1 -> root chain so the leaf staple is at
+         * idx 0. */
+        test_ocsp_tls_cert_cb_opts.chainLen = 3;
+        test_ocsp_tls_cert_cb_opts.failStaple = 0;
+        test_ctx.s_cb.ctx_ready = test_ocsp_tls_cert_cb_ctx_ready;
+
+        ExpectIntEQ(test_ssl_memio_setup(&test_ctx), TEST_SUCCESS);
+        ExpectIntEQ(wolfSSL_UnloadCertsKeys(test_ctx.s_ssl), WOLFSSL_SUCCESS);
+
+        /* server: enable stapling and supply the multi-single leaf */
+        ExpectIntEQ(wolfSSL_CTX_EnableOCSPStapling(test_ctx.s_ctx),
+                WOLFSSL_SUCCESS);
+        ExpectIntEQ(wolfSSL_CTX_set_tlsext_status_cb(test_ctx.s_ctx,
+                test_ocsp_revoked_multi_single_status_cb), WOLFSSL_SUCCESS);
+
+        /* client: verify chain via callback, request status_request_v2 multi.
+         * Deliberately no ocsp_status_verify_cb: exercise DoCertificateStatus
+         * in isolation. */
+        wolfSSL_set_verify(test_ctx.c_ssl, WOLFSSL_VERIFY_DEFAULT,
+                test_ocsp_tls_cert_cb_verify_cb);
+        wolfSSL_SetCertCbCtx(test_ctx.c_ssl, test_ctx.c_ssl);
+        ExpectIntEQ(wolfSSL_CTX_EnableOCSPStapling(test_ctx.c_ctx),
+                WOLFSSL_SUCCESS);
+        ExpectIntEQ(wolfSSL_CTX_EnableOCSPMustStaple(test_ctx.c_ctx),
+                WOLFSSL_SUCCESS);
+        ExpectIntEQ(wolfSSL_UseOCSPStaplingV2(test_ctx.c_ssl,
+                WOLFSSL_CSR2_OCSP_MULTI, WOLFSSL_CSR2_OCSP_USE_NONCE),
+                WOLFSSL_SUCCESS);
+
+        /* Revoked leaf must abort the handshake. */
+        ExpectIntEQ(test_ssl_memio_do_handshake(&test_ctx, 10, NULL),
+                TEST_FAIL);
+        XMEMSET(&h, 0, sizeof(h));
+        ExpectIntEQ(wolfSSL_get_alert_history(test_ctx.s_ssl, &h),
+                WOLFSSL_SUCCESS);
+        ExpectIntEQ(h.last_rx.level, alert_fatal);
+        ExpectIntEQ(h.last_rx.code, bad_certificate_status_response);
+
+        test_ssl_memio_cleanup(&test_ctx);
+    }
+    return EXPECT_RESULT();
+}
+#else
+int test_ocsp_status_request_v2_multi_revoked_single(void)
+{
+    return TEST_SKIPPED;
+}
+#endif /* HAVE_CERTIFICATE_STATUS_REQUEST_V2 && !WOLFSSL_NO_TLS12 */
+
 #else  /* feature guards */
 int test_ocsp_tls_cert_cb(void)
 {
     return TEST_SKIPPED;
 }
+int test_ocsp_status_request_v2_multi_revoked_single(void)
+{
+    return TEST_SKIPPED;
+}
 #endif
 
 /*
diff --git a/tests/api/test_ocsp.h b/tests/api/test_ocsp.h
@@ -30,6 +30,7 @@ int test_ocsp_basic_verify(void);
 int test_ocsp_responder_keyhash_binding(void);
 int test_ocsp_response_parsing(void);
 int test_ocsp_tls_cert_cb(void);
+int test_ocsp_status_request_v2_multi_revoked_single(void);
 int test_ocsp_cert_unknown_crl_fallback(void);
 int test_ocsp_cert_unknown_crl_fallback_nonleaf(void);
 int test_tls13_nonblock_ocsp_low_mfl(void);
diff --git a/tests/api/test_ocsp_test_blobs.h b/tests/api/test_ocsp_test_blobs.h
@@ -2415,4 +2415,64 @@ unsigned char resp_bad[] = {
     0x63, 0x29, 0xc6, 0xa8, 0x97, 0x4b, 0x14, 0xff, 0xd2,
 };
 
+unsigned char resp_server1_revoked_good_first[] = {
+    0x30, 0x82, 0x02, 0x9e, 0x0a, 0x01, 0x00, 0xa0, 0x82, 0x02, 0x97, 0x30,
+    0x82, 0x02, 0x93, 0x06, 0x09, 0x2b, 0x06, 0x01, 0x05, 0x05, 0x07, 0x30,
+    0x01, 0x01, 0x04, 0x82, 0x02, 0x84, 0x30, 0x82, 0x02, 0x80, 0x30, 0x82,
+    0x01, 0x6a, 0xa1, 0x81, 0xa4, 0x30, 0x81, 0xa1, 0x31, 0x0b, 0x30, 0x09,
+    0x06, 0x03, 0x55, 0x04, 0x06, 0x13, 0x02, 0x55, 0x53, 0x31, 0x13, 0x30,
+    0x11, 0x06, 0x03, 0x55, 0x04, 0x08, 0x0c, 0x0a, 0x57, 0x61, 0x73, 0x68,
+    0x69, 0x6e, 0x67, 0x74, 0x6f, 0x6e, 0x31, 0x10, 0x30, 0x0e, 0x06, 0x03,
+    0x55, 0x04, 0x07, 0x0c, 0x07, 0x53, 0x65, 0x61, 0x74, 0x74, 0x6c, 0x65,
+    0x31, 0x10, 0x30, 0x0e, 0x06, 0x03, 0x55, 0x04, 0x0a, 0x0c, 0x07, 0x77,
+    0x6f, 0x6c, 0x66, 0x53, 0x53, 0x4c, 0x31, 0x14, 0x30, 0x12, 0x06, 0x03,
+    0x55, 0x04, 0x0b, 0x0c, 0x0b, 0x45, 0x6e, 0x67, 0x69, 0x6e, 0x65, 0x65,
+    0x72, 0x69, 0x6e, 0x67, 0x31, 0x22, 0x30, 0x20, 0x06, 0x03, 0x55, 0x04,
+    0x03, 0x0c, 0x19, 0x77, 0x6f, 0x6c, 0x66, 0x53, 0x53, 0x4c, 0x20, 0x69,
+    0x6e, 0x74, 0x65, 0x72, 0x6d, 0x65, 0x64, 0x69, 0x61, 0x74, 0x65, 0x20,
+    0x43, 0x41, 0x20, 0x31, 0x31, 0x1f, 0x30, 0x1d, 0x06, 0x09, 0x2a, 0x86,
+    0x48, 0x86, 0xf7, 0x0d, 0x01, 0x09, 0x01, 0x16, 0x10, 0x69, 0x6e, 0x66,
+    0x6f, 0x40, 0x77, 0x6f, 0x6c, 0x66, 0x73, 0x73, 0x6c, 0x2e, 0x63, 0x6f,
+    0x6d, 0x18, 0x0f, 0x32, 0x30, 0x32, 0x36, 0x30, 0x36, 0x32, 0x31, 0x31,
+    0x36, 0x34, 0x32, 0x33, 0x36, 0x5a, 0x30, 0x81, 0xaf, 0x30, 0x4d, 0x30,
+    0x38, 0x30, 0x07, 0x06, 0x05, 0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x04, 0x14,
+    0x71, 0x4d, 0x82, 0x23, 0x40, 0x59, 0xc0, 0x96, 0xa1, 0x37, 0x43, 0xfa,
+    0x31, 0xdb, 0xba, 0xb1, 0x43, 0x18, 0xda, 0x04, 0x04, 0x14, 0x83, 0xc6,
+    0x3a, 0x89, 0x2c, 0x81, 0xf4, 0x02, 0xd7, 0x9d, 0x4c, 0xe2, 0x2a, 0xc0,
+    0x71, 0x82, 0x64, 0x44, 0xda, 0x0e, 0x02, 0x01, 0x01, 0x80, 0x00, 0x18,
+    0x0f, 0x32, 0x30, 0x32, 0x36, 0x30, 0x36, 0x32, 0x31, 0x31, 0x36, 0x34,
+    0x32, 0x33, 0x36, 0x5a, 0x30, 0x5e, 0x30, 0x38, 0x30, 0x07, 0x06, 0x05,
+    0x2b, 0x0e, 0x03, 0x02, 0x1a, 0x04, 0x14, 0x71, 0x4d, 0x82, 0x23, 0x40,
+    0x59, 0xc0, 0x96, 0xa1, 0x37, 0x43, 0xfa, 0x31, 0xdb, 0xba, 0xb1, 0x43,
+    0x18, 0xda, 0x04, 0x04, 0x14, 0x83, 0xc6, 0x3a, 0x89, 0x2c, 0x81, 0xf4,
+    0x02, 0xd7, 0x9d, 0x4c, 0xe2, 0x2a, 0xc0, 0x71, 0x82, 0x64, 0x44, 0xda,
+    0x0e, 0x02, 0x01, 0x05, 0xa1, 0x11, 0x18, 0x0f, 0x32, 0x30, 0x32, 0x36,
+    0x30, 0x36, 0x32, 0x31, 0x31, 0x36, 0x34, 0x32, 0x33, 0x36, 0x5a, 0x18,
+    0x0f, 0x32, 0x30, 0x32, 0x36, 0x30, 0x36, 0x32, 0x31, 0x31, 0x36, 0x34,
+    0x32, 0x33, 0x36, 0x5a, 0x30, 0x0b, 0x06, 0x09, 0x2a, 0x86, 0x48, 0x86,
+    0xf7, 0x0d, 0x01, 0x01, 0x0b, 0x03, 0x82, 0x01, 0x01, 0x00, 0xc4, 0x95,
+    0xdb, 0x71, 0xca, 0x09, 0x4b, 0x37, 0xf1, 0xe8, 0x25, 0xc4, 0x75, 0x6f,
+    0x87, 0x22, 0x95, 0x8b, 0x7f, 0x7f, 0x00, 0xf0, 0x75, 0x35, 0x66, 0xea,
+    0x56, 0x26, 0xc4, 0x9a, 0xe1, 0x40, 0xe9, 0xd2, 0x7c, 0x8c, 0x83, 0x0f,
+    0x33, 0x33, 0xac, 0x1e, 0xcc, 0x8e, 0x0e, 0x99, 0x43, 0xb8, 0xd6, 0x13,
+    0xfa, 0xdb, 0xbe, 0xaf, 0x64, 0x6a, 0xbd, 0x92, 0x35, 0xb2, 0x7e, 0xaf,
+    0xda, 0x49, 0x89, 0xa2, 0x37, 0xcc, 0x50, 0x88, 0xa8, 0x0b, 0xb4, 0xe1,
+    0x6a, 0xb7, 0x94, 0x06, 0x92, 0xb8, 0x6a, 0xd2, 0x55, 0xfe, 0x7e, 0xb4,
+    0x5e, 0x12, 0xed, 0x9d, 0xf6, 0x04, 0x49, 0x2c, 0x68, 0xae, 0xc4, 0x21,
+    0x3c, 0xd4, 0xe4, 0x97, 0x76, 0x2c, 0xdb, 0x78, 0xfb, 0x22, 0xdd, 0x3b,
+    0xed, 0x03, 0x68, 0xaa, 0x7b, 0x9d, 0xd2, 0x66, 0x9f, 0x53, 0xc8, 0x45,
+    0xe7, 0x8d, 0xeb, 0x39, 0x05, 0x90, 0xbe, 0x9e, 0xe3, 0x3f, 0xcd, 0x4c,
+    0x0a, 0x37, 0x3c, 0x18, 0xbb, 0xef, 0x2e, 0xb6, 0x53, 0xda, 0x65, 0xfb,
+    0xd6, 0xd4, 0xfa, 0x04, 0xcb, 0x93, 0x23, 0x60, 0x5e, 0x62, 0x8b, 0xd2,
+    0x14, 0xe4, 0x14, 0xd3, 0x3f, 0xdd, 0x8b, 0x65, 0x55, 0x95, 0x27, 0x45,
+    0xdb, 0x7c, 0x74, 0x88, 0x33, 0x7b, 0x2d, 0x6e, 0x11, 0x41, 0x19, 0xc6,
+    0xe2, 0x79, 0x3d, 0x27, 0xc1, 0x5e, 0xb1, 0xcc, 0xf9, 0x6a, 0x9c, 0xaf,
+    0x73, 0x78, 0xc5, 0xeb, 0x1b, 0xfa, 0x6f, 0x92, 0x6b, 0x75, 0xf0, 0x70,
+    0xc9, 0x44, 0xd2, 0xa8, 0xbe, 0x2e, 0xee, 0x0e, 0x0b, 0xac, 0x7f, 0x99,
+    0x6d, 0x67, 0x1e, 0x2d, 0x7d, 0x19, 0x3a, 0x66, 0x1b, 0xb2, 0x0f, 0xfe,
+    0x49, 0x89, 0x24, 0xb2, 0x15, 0xa6, 0xcc, 0xd2, 0xdd, 0xc4, 0x45, 0xfb,
+    0xd2, 0xe5, 0xeb, 0xe8, 0xd7, 0x09, 0xf1, 0xc0, 0xb8, 0x0d, 0xc8, 0x34,
+    0xc2, 0x6c,
+};
+
 #endif /* OCSP_TEST_BLOBS_H */
