/*

 * Copyright 2016-2025 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 may obtain a copy of the License at

 * https://www.openssl.org/source/license.html

 * or in the file LICENSE in the source distribution.

 */

/*

 * Fuzz ASN.1 parsing for various data structures. Specify which on the

 * command line:

 *

 * asn1 <data structure>

 */

/* We need to use some deprecated APIs */

#define OPENSSL_SUPPRESS_DEPRECATED

#include <stdio.h>

#include <string.h>

#include <openssl/asn1.h>

#include <openssl/asn1t.h>

#include <openssl/dh.h>

#include <openssl/dsa.h>

#include <openssl/ec.h>

#include <openssl/ocsp.h>

#include <openssl/pkcs12.h>

#include <openssl/rsa.h>

#include <openssl/ts.h>

#include <openssl/x509v3.h>

#include <openssl/cms.h>

#include <openssl/ess.h>

#include <openssl/err.h>

#include <openssl/rand.h>

#include <openssl/bio.h>

#include <openssl/evp.h>

#include <openssl/ssl.h>

#include <openssl/x509_acert.h>

#include "internal/nelem.h"

#include "fuzzer.h"

static ASN1_ITEM_EXP *item_type[] = {

    ASN1_ITEM_ref(ACCESS_DESCRIPTION),

#ifndef OPENSSL_NO_RFC3779

    ASN1_ITEM_ref(ASIdentifierChoice),

    ASN1_ITEM_ref(ASIdentifiers),

    ASN1_ITEM_ref(ASIdOrRange),

#endif

    ASN1_ITEM_ref(ASN1_ANY),

    ASN1_ITEM_ref(ASN1_BIT_STRING),

    ASN1_ITEM_ref(ASN1_BMPSTRING),

    ASN1_ITEM_ref(ASN1_BOOLEAN),

    ASN1_ITEM_ref(ASN1_ENUMERATED),

    ASN1_ITEM_ref(ASN1_FBOOLEAN),

    ASN1_ITEM_ref(ASN1_GENERALIZEDTIME),

    ASN1_ITEM_ref(ASN1_GENERALSTRING),

    ASN1_ITEM_ref(ASN1_IA5STRING),

    ASN1_ITEM_ref(ASN1_INTEGER),

    ASN1_ITEM_ref(ASN1_NULL),

    ASN1_ITEM_ref(ASN1_OBJECT),

    ASN1_ITEM_ref(ASN1_OCTET_STRING),

    ASN1_ITEM_ref(ASN1_OCTET_STRING_NDEF),

    ASN1_ITEM_ref(ASN1_PRINTABLE),

    ASN1_ITEM_ref(ASN1_PRINTABLESTRING),

    ASN1_ITEM_ref(ASN1_SEQUENCE),

    ASN1_ITEM_ref(ASN1_SEQUENCE_ANY),

    ASN1_ITEM_ref(ASN1_SET_ANY),

    ASN1_ITEM_ref(ASN1_T61STRING),

    ASN1_ITEM_ref(ASN1_TBOOLEAN),

    ASN1_ITEM_ref(ASN1_TIME),

    ASN1_ITEM_ref(ASN1_UNIVERSALSTRING),

    ASN1_ITEM_ref(ASN1_UTCTIME),

    ASN1_ITEM_ref(ASN1_UTF8STRING),

    ASN1_ITEM_ref(ASN1_VISIBLESTRING),

#ifndef OPENSSL_NO_RFC3779

    ASN1_ITEM_ref(ASRange),

#endif

    ASN1_ITEM_ref(AUTHORITY_INFO_ACCESS),

    ASN1_ITEM_ref(AUTHORITY_KEYID),

    ASN1_ITEM_ref(BASIC_CONSTRAINTS),

    ASN1_ITEM_ref(BIGNUM),

    ASN1_ITEM_ref(CBIGNUM),

    ASN1_ITEM_ref(CERTIFICATEPOLICIES),

#ifndef OPENSSL_NO_CMS

    ASN1_ITEM_ref(CMS_ContentInfo),

    ASN1_ITEM_ref(CMS_ReceiptRequest),

    ASN1_ITEM_ref(CRL_DIST_POINTS),

#endif

#ifndef OPENSSL_NO_DH

    ASN1_ITEM_ref(DHparams),

#endif

    ASN1_ITEM_ref(DIRECTORYSTRING),

    ASN1_ITEM_ref(DISPLAYTEXT),

    ASN1_ITEM_ref(DIST_POINT),

    ASN1_ITEM_ref(DIST_POINT_NAME),

#if !defined(OPENSSL_NO_EC) && !defined(OPENSSL_NO_DEPRECATED_3_0)

    ASN1_ITEM_ref(ECPARAMETERS),

    ASN1_ITEM_ref(ECPKPARAMETERS),

#endif

    ASN1_ITEM_ref(EDIPARTYNAME),

    ASN1_ITEM_ref(EXTENDED_KEY_USAGE),

    ASN1_ITEM_ref(GENERAL_NAME),

    ASN1_ITEM_ref(GENERAL_NAMES),

    ASN1_ITEM_ref(GENERAL_SUBTREE),

#ifndef OPENSSL_NO_RFC3779

    ASN1_ITEM_ref(IPAddressChoice),

    ASN1_ITEM_ref(IPAddressFamily),

    ASN1_ITEM_ref(IPAddressOrRange),

    ASN1_ITEM_ref(IPAddressRange),

#endif

    ASN1_ITEM_ref(ISSUING_DIST_POINT),

#ifndef OPENSSL_NO_DEPRECATED_3_0

    ASN1_ITEM_ref(LONG),

#endif

    ASN1_ITEM_ref(NAME_CONSTRAINTS),

    ASN1_ITEM_ref(NETSCAPE_CERT_SEQUENCE),

    ASN1_ITEM_ref(NETSCAPE_SPKAC),

    ASN1_ITEM_ref(NETSCAPE_SPKI),

    ASN1_ITEM_ref(NOTICEREF),

#ifndef OPENSSL_NO_OCSP

    ASN1_ITEM_ref(OCSP_BASICRESP),

    ASN1_ITEM_ref(OCSP_CERTID),

    ASN1_ITEM_ref(OCSP_CERTSTATUS),

    ASN1_ITEM_ref(OCSP_CRLID),

    ASN1_ITEM_ref(OCSP_ONEREQ),

    ASN1_ITEM_ref(OCSP_REQINFO),

    ASN1_ITEM_ref(OCSP_REQUEST),

    ASN1_ITEM_ref(OCSP_RESPBYTES),

    ASN1_ITEM_ref(OCSP_RESPDATA),

    ASN1_ITEM_ref(OCSP_RESPID),

    ASN1_ITEM_ref(OCSP_RESPONSE),

    ASN1_ITEM_ref(OCSP_REVOKEDINFO),

    ASN1_ITEM_ref(OCSP_SERVICELOC),

    ASN1_ITEM_ref(OCSP_SIGNATURE),

    ASN1_ITEM_ref(OCSP_SINGLERESP),

#endif

    ASN1_ITEM_ref(OTHERNAME),

    ASN1_ITEM_ref(PBE2PARAM),

    ASN1_ITEM_ref(PBEPARAM),

    ASN1_ITEM_ref(PBKDF2PARAM),

    ASN1_ITEM_ref(PKCS12),

    ASN1_ITEM_ref(PKCS12_AUTHSAFES),

    ASN1_ITEM_ref(PKCS12_BAGS),

    ASN1_ITEM_ref(PKCS12_MAC_DATA),

    ASN1_ITEM_ref(PKCS12_SAFEBAG),

    ASN1_ITEM_ref(PKCS12_SAFEBAGS),

    ASN1_ITEM_ref(PKCS7),

    ASN1_ITEM_ref(PKCS7_ATTR_SIGN),

    ASN1_ITEM_ref(PKCS7_ATTR_VERIFY),

    ASN1_ITEM_ref(PKCS7_DIGEST),

    ASN1_ITEM_ref(PKCS7_ENC_CONTENT),

    ASN1_ITEM_ref(PKCS7_ENCRYPT),

    ASN1_ITEM_ref(PKCS7_ENVELOPE),

    ASN1_ITEM_ref(PKCS7_ISSUER_AND_SERIAL),

    ASN1_ITEM_ref(PKCS7_RECIP_INFO),

    ASN1_ITEM_ref(PKCS7_SIGNED),

    ASN1_ITEM_ref(PKCS7_SIGN_ENVELOPE),

    ASN1_ITEM_ref(PKCS7_SIGNER_INFO),

    ASN1_ITEM_ref(PKCS8_PRIV_KEY_INFO),

    ASN1_ITEM_ref(PKEY_USAGE_PERIOD),

    ASN1_ITEM_ref(POLICY_CONSTRAINTS),

    ASN1_ITEM_ref(POLICYINFO),

    ASN1_ITEM_ref(POLICY_MAPPING),

    ASN1_ITEM_ref(POLICY_MAPPINGS),

    ASN1_ITEM_ref(POLICYQUALINFO),

    ASN1_ITEM_ref(PROXY_CERT_INFO_EXTENSION),

    ASN1_ITEM_ref(PROXY_POLICY),

    ASN1_ITEM_ref(RSA_OAEP_PARAMS),

    ASN1_ITEM_ref(RSA_PSS_PARAMS),

#ifndef OPENSSL_NO_DEPRECATED_3_0

    ASN1_ITEM_ref(RSAPrivateKey),

    ASN1_ITEM_ref(RSAPublicKey),

#endif

    ASN1_ITEM_ref(SXNET),

    ASN1_ITEM_ref(SXNETID),

    ASN1_ITEM_ref(OSSL_TARGETING_INFORMATION),

    ASN1_ITEM_ref(USERNOTICE),

    ASN1_ITEM_ref(X509),

    ASN1_ITEM_ref(X509_ALGOR),

    ASN1_ITEM_ref(X509_ALGORS),

    ASN1_ITEM_ref(X509_ATTRIBUTE),

    ASN1_ITEM_ref(X509_CERT_AUX),

    ASN1_ITEM_ref(X509_CINF),

    ASN1_ITEM_ref(X509_CRL),

    ASN1_ITEM_ref(X509_CRL_INFO),

    ASN1_ITEM_ref(X509_EXTENSION),

    ASN1_ITEM_ref(X509_EXTENSIONS),

    ASN1_ITEM_ref(X509_NAME),

    ASN1_ITEM_ref(X509_NAME_ENTRY),

    ASN1_ITEM_ref(X509_PUBKEY),

    ASN1_ITEM_ref(X509_REQ),

    ASN1_ITEM_ref(X509_REQ_INFO),

    ASN1_ITEM_ref(X509_REVOKED),

    ASN1_ITEM_ref(X509_SIG),

    ASN1_ITEM_ref(X509_VAL),

#ifndef OPENSSL_NO_DEPRECATED_3_0

    ASN1_ITEM_ref(ZLONG),

#endif

    ASN1_ITEM_ref(INT32),

    ASN1_ITEM_ref(ZINT32),

    ASN1_ITEM_ref(UINT32),

    ASN1_ITEM_ref(ZUINT32),

    ASN1_ITEM_ref(INT64),

    ASN1_ITEM_ref(ZINT64),

    ASN1_ITEM_ref(UINT64),

    ASN1_ITEM_ref(ZUINT64),

    NULL

};

static ASN1_PCTX *pctx;

#define DO_TEST(TYPE, D2I, I2D, PRINT)         \

    {                                          \

        const unsigned char *p = buf;          \

        unsigned char *der = NULL;             \

        TYPE *type = D2I(NULL, &p, (long)len); \

                                               \

        if (type != NULL) {                    \

            int len2;                          \

            BIO *bio = BIO_new(BIO_s_null());  \

                                               \

            if (bio != NULL) {                 \

                PRINT(bio, type);              \

                BIO_free(bio);                 \

            }                                  \

            len2 = I2D(type, &der);            \

            if (len2 != 0) { }                 \

            OPENSSL_free(der);                 \

            TYPE##_free(type);                 \

        }                                      \

    }

#define DO_TEST_PRINT_OFFSET(TYPE, D2I, I2D, PRINT) \

    {                                               \

        const unsigned char *p = buf;               \

        unsigned char *der = NULL;                  \

        TYPE *type = D2I(NULL, &p, (long)len);      \

                                                    \

        if (type != NULL) {                         \

            BIO *bio = BIO_new(BIO_s_null());       \

                                                    \

            if (bio != NULL) {                      \

                PRINT(bio, type, 0);                \

                BIO_free(bio);                      \

            }                                       \

            I2D(type, &der);                        \

            OPENSSL_free(der);                      \

            TYPE##_free(type);                      \

        }                                           \

    }

#define DO_TEST_PRINT_PCTX(TYPE, D2I, I2D, PRINT) \

    {                                             \

        const unsigned char *p = buf;             \

        unsigned char *der = NULL;                \

        TYPE *type = D2I(NULL, &p, (long)len);    \

                                                  \

        if (type != NULL) {                       \

            BIO *bio = BIO_new(BIO_s_null());     \

                                                  \

            if (bio != NULL) {                    \

                PRINT(bio, type, 0, pctx);        \

                BIO_free(bio);                    \

            }                                     \

            I2D(type, &der);                      \

            OPENSSL_free(der);                    \

            TYPE##_free(type);                    \

        }                                         \

    }

#define DO_TEST_NO_PRINT(TYPE, D2I, I2D)       \

    {                                          \

        const unsigned char *p = buf;          \

        unsigned char *der = NULL;             \

        TYPE *type = D2I(NULL, &p, (long)len); \

                                               \

        if (type != NULL) {                    \

            I2D(type, &der);                   \

            OPENSSL_free(der);                 \

            TYPE##_free(type);                 \

        }                                      \

    }

int FuzzerInitialize(int *argc, char ***argv)

{

    FuzzerSetRand();

    pctx = ASN1_PCTX_new();

    if (pctx == NULL)

        return 0;

    ASN1_PCTX_set_flags(pctx, ASN1_PCTX_FLAGS_SHOW_ABSENT | ASN1_PCTX_FLAGS_SHOW_SEQUENCE | ASN1_PCTX_FLAGS_SHOW_SSOF | ASN1_PCTX_FLAGS_SHOW_TYPE | ASN1_PCTX_FLAGS_SHOW_FIELD_STRUCT_NAME);

    ASN1_PCTX_set_str_flags(pctx, ASN1_STRFLGS_UTF8_CONVERT | ASN1_STRFLGS_SHOW_TYPE | ASN1_STRFLGS_DUMP_ALL);

    OPENSSL_init_crypto(OPENSSL_INIT_LOAD_CRYPTO_STRINGS, NULL);

    OPENSSL_init_ssl(OPENSSL_INIT_LOAD_SSL_STRINGS, NULL);

    ERR_clear_error();

    CRYPTO_free_ex_index(0, -1);

    return 1;

}

int FuzzerTestOneInput(const uint8_t *buf, size_t len)

{

    int n;

    for (n = 0; item_type[n] != NULL; ++n) {

        const uint8_t *b = buf;

        unsigned char *der = NULL;

        const ASN1_ITEM *i = ASN1_ITEM_ptr(item_type[n]);

        ASN1_VALUE *o = ASN1_item_d2i(NULL, &b, (long)len, i);

        if (o != NULL) {

            /*

             * Don't print excessively long output to prevent spurious fuzzer

             * timeouts.

             */

            if (b - buf < 10000) {

                BIO *bio = BIO_new(BIO_s_null());

                if (bio != NULL) {

                    ASN1_item_print(bio, o, 4, i, pctx);

                    BIO_free(bio);

                }

            }

            if (ASN1_item_i2d(o, &der, i) > 0) {

                OPENSSL_free(der);

            }

            ASN1_item_free(o, i);

        }

    }

#ifndef OPENSSL_NO_TS

    DO_TEST(TS_REQ, d2i_TS_REQ, i2d_TS_REQ, TS_REQ_print_bio);

    DO_TEST(TS_MSG_IMPRINT, d2i_TS_MSG_IMPRINT, i2d_TS_MSG_IMPRINT, TS_MSG_IMPRINT_print_bio);

    DO_TEST(TS_RESP, d2i_TS_RESP, i2d_TS_RESP, TS_RESP_print_bio);

    DO_TEST(TS_STATUS_INFO, d2i_TS_STATUS_INFO, i2d_TS_STATUS_INFO, TS_STATUS_INFO_print_bio);

    DO_TEST(TS_TST_INFO, d2i_TS_TST_INFO, i2d_TS_TST_INFO, TS_TST_INFO_print_bio);

    DO_TEST_NO_PRINT(TS_ACCURACY, d2i_TS_ACCURACY, i2d_TS_ACCURACY);

#endif

    DO_TEST_NO_PRINT(ESS_ISSUER_SERIAL, d2i_ESS_ISSUER_SERIAL, i2d_ESS_ISSUER_SERIAL);

    DO_TEST_NO_PRINT(ESS_CERT_ID, d2i_ESS_CERT_ID, i2d_ESS_CERT_ID);

    DO_TEST_NO_PRINT(ESS_SIGNING_CERT, d2i_ESS_SIGNING_CERT, i2d_ESS_SIGNING_CERT);

    DO_TEST_NO_PRINT(ESS_CERT_ID_V2, d2i_ESS_CERT_ID_V2, i2d_ESS_CERT_ID_V2);

    DO_TEST_NO_PRINT(ESS_SIGNING_CERT_V2, d2i_ESS_SIGNING_CERT_V2, i2d_ESS_SIGNING_CERT_V2);

#if !defined(OPENSSL_NO_DH) && !defined(OPENSSL_NO_DEPRECATED_3_0)

    DO_TEST_NO_PRINT(DH, d2i_DHparams, i2d_DHparams);

    DO_TEST_NO_PRINT(DH, d2i_DHxparams, i2d_DHxparams);

#endif

#ifndef OPENSSL_NO_DSA

    DO_TEST_NO_PRINT(DSA_SIG, d2i_DSA_SIG, i2d_DSA_SIG);

#ifndef OPENSSL_NO_DEPRECATED_3_0

    DO_TEST_NO_PRINT(DSA, d2i_DSAPrivateKey, i2d_DSAPrivateKey);

    DO_TEST_NO_PRINT(DSA, d2i_DSAPublicKey, i2d_DSAPublicKey);

    DO_TEST_NO_PRINT(DSA, d2i_DSAparams, i2d_DSAparams);

#endif

#endif

#ifndef OPENSSL_NO_DEPRECATED_3_0

    DO_TEST_NO_PRINT(RSA, d2i_RSAPublicKey, i2d_RSAPublicKey);

#endif

#ifndef OPENSSL_NO_EC

#ifndef OPENSSL_NO_DEPRECATED_3_0

    DO_TEST_PRINT_OFFSET(EC_GROUP, d2i_ECPKParameters, i2d_ECPKParameters, ECPKParameters_print);

    DO_TEST_PRINT_OFFSET(EC_KEY, d2i_ECPrivateKey, i2d_ECPrivateKey, EC_KEY_print);

    DO_TEST(EC_KEY, d2i_ECParameters, i2d_ECParameters, ECParameters_print);

    DO_TEST_NO_PRINT(ECDSA_SIG, d2i_ECDSA_SIG, i2d_ECDSA_SIG);

#endif

#endif

    DO_TEST_PRINT_PCTX(EVP_PKEY, d2i_AutoPrivateKey, i2d_PrivateKey, EVP_PKEY_print_private);

    DO_TEST(SSL_SESSION, d2i_SSL_SESSION, i2d_SSL_SESSION, SSL_SESSION_print);

    ERR_clear_error();

    return 0;

}

void FuzzerCleanup(void)

{

    ASN1_PCTX_free(pctx);

    FuzzerClearRand();

}