Add CMP fuzzing to fuzz/cmp.c, including a couple of helpers in crypto/cmp/

Reviewed-by: Kurt Roeckx <kurt@roeckx.be>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/11386)

1 files changed, 203 insertions, 0 deletions

diff --git a/fuzz/cmp.c b/fuzz/cmp.c
new file mode 100644
index 0000000000..0088dd9478
--- /dev/null
+++ b/fuzz/cmp.c
@@ -0,0 +1,203 @@
+/*
+ * Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+/*
+ * Test CMP DER parsing.
+ */
+
+#include <openssl/bio.h>
+#include <openssl/cmp.h>
+#include "../crypto/cmp/cmp_local.h"
+#include <openssl/err.h>
+#include "fuzzer.h"
+#include "rand.inc"
+
+int FuzzerInitialize(int *argc, char ***argv)
+{
+    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);
+    ERR_clear_error();
+    CRYPTO_free_ex_index(0, -1);
+    FuzzerSetRand();
+    return 1;
+}
+
+static int num_responses;
+
+static OSSL_CMP_MSG *transfer_cb(OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *req)
+{
+    if (num_responses++ > 2)
+        return NULL; /* prevent loops due to repeated pollRep */
+    return OSSL_CMP_MSG_dup((OSSL_CMP_MSG *)
+                            OSSL_CMP_CTX_get_transfer_cb_arg(ctx));
+}
+
+static int print_noop(const char *func, const char *file, int line,
+                      OSSL_CMP_severity level, const char *msg)
+{
+    return 1;
+}
+
+static int allow_unprotected(const OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *rep,
+                             int invalid_protection, int expected_type)
+{
+    return 1;
+}
+
+static void cmp_client_process_response(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg)
+{
+    X509_NAME *name = X509_NAME_new();
+    ASN1_INTEGER *serial = ASN1_INTEGER_new();
+
+    ctx->unprotectedSend = 1; /* satisfy ossl_cmp_msg_protect() */
+    ctx->disableConfirm = 1; /* check just one response message */
+    ctx->popoMethod = OSSL_CRMF_POPO_NONE; /* satisfy ossl_cmp_certReq_new() */
+    ctx->oldCert = X509_new(); /* satisfy crm_new() and ossl_cmp_rr_new() */
+    if (!OSSL_CMP_CTX_set1_secretValue(ctx, (unsigned char *)"",
+                                       0) /* prevent too unspecific error */
+            || ctx->oldCert == NULL
+            || name == NULL || !X509_set_issuer_name(ctx->oldCert, name)
+            || serial == NULL || !X509_set_serialNumber(ctx->oldCert, serial))
+        goto err;
+
+    (void)OSSL_CMP_CTX_set_transfer_cb(ctx, transfer_cb);
+    (void)OSSL_CMP_CTX_set_transfer_cb_arg(ctx, msg);
+    (void)OSSL_CMP_CTX_set_log_cb(ctx, print_noop);
+    num_responses = 0;
+    switch (msg->body != NULL ? msg->body->type : -1) {
+    case OSSL_CMP_PKIBODY_IP:
+        (void)OSSL_CMP_exec_IR_ses(ctx);
+        break;
+    case OSSL_CMP_PKIBODY_CP:
+        (void)OSSL_CMP_exec_CR_ses(ctx);
+        (void)OSSL_CMP_exec_P10CR_ses(ctx);
+        break;
+    case OSSL_CMP_PKIBODY_KUP:
+        (void)OSSL_CMP_exec_KUR_ses(ctx);
+        break;
+    case OSSL_CMP_PKIBODY_POLLREP:
+        ctx->status = OSSL_CMP_PKISTATUS_waiting;
+        (void)OSSL_CMP_try_certreq(ctx, OSSL_CMP_PKIBODY_CR, NULL);
+        break;
+    case OSSL_CMP_PKIBODY_RP:
+        (void)OSSL_CMP_exec_RR_ses(ctx);
+        break;
+    case OSSL_CMP_PKIBODY_GENP:
+        sk_OSSL_CMP_ITAV_pop_free(OSSL_CMP_exec_GENM_ses(ctx),
+                                  OSSL_CMP_ITAV_free);
+        break;
+    default:
+        (void)ossl_cmp_msg_check_received(ctx, msg, allow_unprotected, 0);
+        break;
+    }
+ err:
+    X509_NAME_free(name);
+    ASN1_INTEGER_free(serial);
+}
+
+static OSSL_CMP_PKISI *process_cert_request(OSSL_CMP_SRV_CTX *srv_ctx,
+                                            const OSSL_CMP_MSG *cert_req,
+                                            int certReqId,
+                                            const OSSL_CRMF_MSG *crm,
+                                            const X509_REQ *p10cr,
+                                            X509 **certOut,
+                                            STACK_OF(X509) **chainOut,
+                                            STACK_OF(X509) **caPubs)
+{
+    CMPerr(0, CMP_R_ERROR_PROCESSING_MESSAGE);
+    return NULL;
+}
+
+static OSSL_CMP_PKISI *process_rr(OSSL_CMP_SRV_CTX *srv_ctx,
+                                  const OSSL_CMP_MSG *rr,
+                                  const X509_NAME *issuer,
+                                  const ASN1_INTEGER *serial)
+{
+    CMPerr(0, CMP_R_ERROR_PROCESSING_MESSAGE);
+    return NULL;
+}
+
+static int process_genm(OSSL_CMP_SRV_CTX *srv_ctx,
+                        const OSSL_CMP_MSG *genm,
+                        const STACK_OF(OSSL_CMP_ITAV) *in,
+                        STACK_OF(OSSL_CMP_ITAV) **out)
+{
+    CMPerr(0, CMP_R_ERROR_PROCESSING_MESSAGE);
+    return 0;
+}
+
+static void process_error(OSSL_CMP_SRV_CTX *srv_ctx, const OSSL_CMP_MSG *error,
+                          const OSSL_CMP_PKISI *statusInfo,
+                          const ASN1_INTEGER *errorCode,
+                          const OSSL_CMP_PKIFREETEXT *errorDetails)
+{
+    CMPerr(0, CMP_R_ERROR_PROCESSING_MESSAGE);
+}
+
+static int process_certConf(OSSL_CMP_SRV_CTX *srv_ctx,
+                            const OSSL_CMP_MSG *certConf, int certReqId,
+                            const ASN1_OCTET_STRING *certHash,
+                            const OSSL_CMP_PKISI *si)
+{
+    CMPerr(0, CMP_R_ERROR_PROCESSING_MESSAGE);
+    return 0;
+}
+
+static int process_pollReq(OSSL_CMP_SRV_CTX *srv_ctx,
+                           const OSSL_CMP_MSG *pollReq, int certReqId,
+                           OSSL_CMP_MSG **certReq, int64_t *check_after)
+{
+    CMPerr(0, CMP_R_ERROR_PROCESSING_MESSAGE);
+    return 0;
+}
+
+int FuzzerTestOneInput(const uint8_t *buf, size_t len)
+{
+    OSSL_CMP_MSG *msg;
+    BIO *in;
+
+    if (len == 0)
+        return 0;
+
+    in = BIO_new(BIO_s_mem());
+    OPENSSL_assert((size_t)BIO_write(in, buf, len) == len);
+    msg = d2i_OSSL_CMP_MSG_bio(in, NULL);
+    if (msg != NULL) {
+        BIO *out = BIO_new(BIO_s_null());
+        OSSL_CMP_SRV_CTX *srv_ctx = OSSL_CMP_SRV_CTX_new();
+        OSSL_CMP_CTX *client_ctx = OSSL_CMP_CTX_new();
+
+        i2d_OSSL_CMP_MSG_bio(out, msg);
+        ASN1_item_print(out, (ASN1_VALUE *)msg, 4,
+                        ASN1_ITEM_rptr(OSSL_CMP_MSG), NULL);
+        BIO_free(out);
+
+        if (client_ctx != NULL)
+            cmp_client_process_response(client_ctx, msg);
+        if (srv_ctx != NULL
+            && OSSL_CMP_CTX_set_log_cb(OSSL_CMP_SRV_CTX_get0_cmp_ctx(srv_ctx),
+                                       print_noop)
+            && OSSL_CMP_SRV_CTX_init(srv_ctx, NULL, process_cert_request,
+                                     process_rr, process_genm, process_error,
+                                     process_certConf, process_pollReq))
+            OSSL_CMP_MSG_free(OSSL_CMP_SRV_process_request(srv_ctx, msg));
+
+        OSSL_CMP_CTX_free(client_ctx);
+        OSSL_CMP_SRV_CTX_free(srv_ctx);
+        OSSL_CMP_MSG_free(msg);
+    }
+
+    BIO_free(in);
+    ERR_clear_error();
+
+    return 0;
+}
+
+void FuzzerCleanup(void)
+{
+}