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openssl/fuzz/provider.c
Tomas Mraz 7ed6de997f Copyright year updates 
Reviewed-by: Neil Horman <nhorman@openssl.org>
Release: yes
2024-09-05 09:35:49 +02:00

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/*
* Copyright 2023-2024 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.
*/
#include <string.h>
#include <openssl/types.h>
#include <openssl/crypto.h>
#include <openssl/core_names.h>
#include <openssl/kdf.h>
#include <openssl/evp.h>
#include <openssl/provider.h>
#include "fuzzer.h"
#define DEFINE_ALGORITHMS(name, evp) DEFINE_STACK_OF(evp) \
static int cmp_##evp(const evp *const *a, const evp *const *b); \
static void collect_##evp(evp *obj, void *stack); \
static void init_##name(OSSL_LIB_CTX *libctx); \
static void cleanup_##name(void); \
static STACK_OF(evp) *name##_collection; \
static int cmp_##evp(const evp *const *a, const evp *const *b) \
{ \
return strcmp(OSSL_PROVIDER_get0_name(evp##_get0_provider(*a)), \
OSSL_PROVIDER_get0_name(evp##_get0_provider(*b))); \
} \
static void collect_##evp(evp *obj, void *stack) \
{ \
STACK_OF(evp) *obj_stack = stack; \
\
if (sk_##evp##_push(obj_stack, obj) > 0) \
evp##_up_ref(obj); \
} \
static void init_##name(OSSL_LIB_CTX *libctx) \
{ \
name##_collection = sk_##evp##_new(cmp_##evp); \
evp##_do_all_provided(libctx, collect_##evp, name##_collection); \
} \
static void cleanup_##name(void) \
{ \
sk_##evp##_pop_free(name##_collection, evp##_free); \
}
DEFINE_ALGORITHMS(digests, EVP_MD)
DEFINE_ALGORITHMS(kdf, EVP_KDF)
DEFINE_ALGORITHMS(cipher, EVP_CIPHER)
DEFINE_ALGORITHMS(kem, EVP_KEM)
DEFINE_ALGORITHMS(keyexch, EVP_KEYEXCH)
DEFINE_ALGORITHMS(rand, EVP_RAND)
DEFINE_ALGORITHMS(mac, EVP_MAC)
DEFINE_ALGORITHMS(keymgmt, EVP_KEYMGMT)
DEFINE_ALGORITHMS(signature, EVP_SIGNATURE)
DEFINE_ALGORITHMS(asym_ciphers, EVP_ASYM_CIPHER)
static OSSL_LIB_CTX *libctx = NULL;
int FuzzerInitialize(int *argc, char ***argv)
{
libctx = OSSL_LIB_CTX_new();
if (libctx == NULL)
return 0;
init_digests(libctx);
init_kdf(libctx);
init_cipher(libctx);
init_kem(libctx);
init_keyexch(libctx);
init_rand(libctx);
init_mac(libctx);
init_keymgmt(libctx);
init_signature(libctx);
init_asym_ciphers(libctx);
return 1;
}
void FuzzerCleanup(void)
{
cleanup_digests();
cleanup_kdf();
cleanup_cipher();
cleanup_kem();
cleanup_keyexch();
cleanup_rand();
cleanup_mac();
cleanup_keymgmt();
cleanup_signature();
cleanup_asym_ciphers();
OSSL_LIB_CTX_free(libctx);
}
static int read_uint(const uint8_t **buf, size_t *len, uint64_t **res)
{
int r = 1;
if (*len < sizeof(uint64_t)) {
r = 0;
goto end;
}
*res = OPENSSL_malloc(sizeof(uint64_t));
**res = (uint64_t) **buf;
*buf += sizeof(uint64_t);
*len -= sizeof(uint64_t);
end:
return r;
}
static int read_int(const uint8_t **buf, size_t *len, int64_t **res)
{
int r = 1;
if (*len < sizeof(int64_t)) {
r = 0;
goto end;
}
*res = OPENSSL_malloc(sizeof(int64_t));
**res = (int64_t) **buf;
*buf += sizeof(int64_t);
*len -= sizeof(int64_t);
end:
return r;
}
static int read_double(const uint8_t **buf, size_t *len, double **res)
{
int r = 1;
if (*len < sizeof(double)) {
r = 0;
goto end;
}
*res = OPENSSL_malloc(sizeof(double));
**res = (double) **buf;
*buf += sizeof(double);
*len -= sizeof(double);
end:
return r;
}
static int read_utf8_string(const uint8_t **buf, size_t *len, char **res)
{
size_t found_len;
int r;
found_len = OPENSSL_strnlen((const char *) *buf, *len);
if (found_len == *len) {
r = -1;
goto end;
}
found_len++; /* skip over the \0 byte */
r = (int) found_len;
*res = (char *) *buf;
*len -= found_len;
*buf = *buf + found_len; /* continue after the \0 byte */
end:
return r;
}
static int read_utf8_ptr(const uint8_t **buf, size_t *len, char **res)
{
if (*len > 0 && **buf == 0xFF) {
/* represent NULL somehow */
*res = NULL;
*buf += 1;
*len -= 1;
return 0;
}
return read_utf8_string(buf, len, res);
}
static int read_octet_string(const uint8_t **buf, size_t *len, char **res)
{
int r;
size_t i;
const uint8_t *ptr = *buf;
int found = 0;
for (i = 0; i < *len; ++i) {
if (*ptr == 0xFF &&
(i + 1 < *len && *(ptr + 1) == 0xFF)) {
ptr++;
found = 1;
break;
}
ptr++;
}
if (!found) {
r = -1;
goto end;
}
*res = (char *) *buf;
r = ptr - *buf;
*len -= r;
*buf = ptr;
end:
return r;
}
static int read_octet_ptr(const uint8_t **buf, size_t *len, char **res)
{
/* TODO: This representation could need an improvement potentially. */
if (*len > 1 && **buf == 0xFF && *(*buf + 1) == 0xFF) {
/* represent NULL somehow */
*res = NULL;
*buf += 2;
*len -= 2;
return 0;
}
return read_octet_string(buf, len, res);
}
static char *DFLT_STR = "";
static char *DFLT_UTF8_PTR = NULL;
static char *DFLT_OCTET_STRING = "";
static char *DFLT_OCTET_PTR = NULL;
static int64_t ITERS = 1;
static uint64_t UITERS = 1;
static int64_t BLOCKSIZE = 8;
static uint64_t UBLOCKSIZE = 8;
static void free_params(OSSL_PARAM *param)
{
for (; param != NULL && param->key != NULL; param++) {
switch (param->data_type) {
case OSSL_PARAM_INTEGER:
case OSSL_PARAM_UNSIGNED_INTEGER:
case OSSL_PARAM_REAL:
if (param->data != NULL) {
OPENSSL_free(param->data);
}
break;
}
}
}
static OSSL_PARAM *fuzz_params(OSSL_PARAM *param, const uint8_t **buf, size_t *len)
{
OSSL_PARAM *p;
OSSL_PARAM *fuzzed_parameters;
int p_num = 0;
for (p = param; p != NULL && p->key != NULL; p++)
p_num++;
fuzzed_parameters = OPENSSL_zalloc(sizeof(OSSL_PARAM) *(p_num + 1));
p = fuzzed_parameters;
for (; param != NULL && param->key != NULL; param++) {
int64_t *use_param = NULL;
int64_t *p_value_int = NULL;
uint64_t *p_value_uint = NULL;
double *p_value_double = NULL;
char *p_value_utf8_str = DFLT_STR;
char *p_value_octet_str = DFLT_OCTET_STRING;
char *p_value_utf8_ptr = DFLT_UTF8_PTR;
char *p_value_octet_ptr = DFLT_OCTET_PTR;
int data_len = 0;
if (!read_int(buf, len, &use_param)) {
use_param = OPENSSL_malloc(sizeof(uint64_t));
*use_param = 0;
}
switch (param->data_type) {
case OSSL_PARAM_INTEGER:
if (strcmp(param->key, OSSL_KDF_PARAM_ITER) == 0) {
p_value_int = OPENSSL_malloc(sizeof(ITERS));
*p_value_int = ITERS;
} else if (strcmp(param->key, OSSL_KDF_PARAM_SCRYPT_N) == 0) {
p_value_int = OPENSSL_malloc(sizeof(ITERS));
*p_value_int = ITERS;
} else if (strcmp(param->key, OSSL_KDF_PARAM_SCRYPT_R) == 0) {
p_value_int = OPENSSL_malloc(sizeof(BLOCKSIZE));
*p_value_int = BLOCKSIZE;
} else if (strcmp(param->key, OSSL_KDF_PARAM_SCRYPT_P) == 0) {
p_value_int = OPENSSL_malloc(sizeof(BLOCKSIZE));
*p_value_int = BLOCKSIZE;
} else if (!*use_param || !read_int(buf, len, &p_value_int)) {
p_value_int = OPENSSL_malloc(sizeof(int64_t));
*p_value_int = 0;
}
*p = *param;
p->data = p_value_int;
p++;
break;
case OSSL_PARAM_UNSIGNED_INTEGER:
if (strcmp(param->key, OSSL_KDF_PARAM_ITER) == 0) {
p_value_uint = OPENSSL_malloc(sizeof(UITERS));
*p_value_uint = UITERS;
} else if (strcmp(param->key, OSSL_KDF_PARAM_SCRYPT_N) == 0) {
p_value_uint = OPENSSL_malloc(sizeof(UITERS));
*p_value_uint = UITERS;
} else if (strcmp(param->key, OSSL_KDF_PARAM_SCRYPT_R) == 0) {
p_value_uint = OPENSSL_malloc(sizeof(UBLOCKSIZE));
*p_value_uint = UBLOCKSIZE;
} else if (strcmp(param->key, OSSL_KDF_PARAM_SCRYPT_P) == 0) {
p_value_uint = OPENSSL_malloc(sizeof(UBLOCKSIZE));
*p_value_uint = UBLOCKSIZE;
} else if (!*use_param || !read_uint(buf, len, &p_value_uint)) {
p_value_uint = OPENSSL_malloc(sizeof(uint64_t));
*p_value_uint = 0;
}
*p = *param;
p->data = p_value_uint;
p++;
break;
case OSSL_PARAM_REAL:
if (!*use_param || !read_double(buf, len, &p_value_double)) {
p_value_double = OPENSSL_malloc(sizeof(double));
*p_value_double = 0;
}
*p = *param;
p->data = p_value_double;
p++;
break;
case OSSL_PARAM_UTF8_STRING:
if (*use_param && (data_len = read_utf8_string(buf, len, &p_value_utf8_str)) < 0)
data_len = 0;
*p = *param;
p->data = p_value_utf8_str;
p->data_size = data_len;
p++;
break;
case OSSL_PARAM_OCTET_STRING:
if (*use_param && (data_len = read_octet_string(buf, len, &p_value_octet_str)) < 0)
data_len = 0;
*p = *param;
p->data = p_value_octet_str;
p->data_size = data_len;
p++;
break;
case OSSL_PARAM_UTF8_PTR:
if (*use_param && (data_len = read_utf8_ptr(buf, len, &p_value_utf8_ptr)) < 0)
data_len = 0;
*p = *param;
p->data = p_value_utf8_ptr;
p->data_size = data_len;
p++;
break;
case OSSL_PARAM_OCTET_PTR:
if (*use_param && (data_len = read_octet_ptr(buf, len, &p_value_octet_ptr)) < 0)
data_len = 0;
*p = *param;
p->data = p_value_octet_ptr;
p->data_size = data_len;
p++;
break;
default:
break;
}
OPENSSL_free(use_param);
}
return fuzzed_parameters;
}
static int do_evp_cipher(const EVP_CIPHER *evp_cipher, const OSSL_PARAM param[])
{
unsigned char outbuf[1024];
int outlen, tmplen;
unsigned char key[] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15};
unsigned char iv[] = {1, 2, 3, 4, 5, 6, 7, 8};
const char intext[] = "text";
EVP_CIPHER_CTX *ctx;
ctx = EVP_CIPHER_CTX_new();
if (!EVP_CIPHER_CTX_set_params(ctx, param)) {
EVP_CIPHER_CTX_free(ctx);
return 0;
}
if (!EVP_EncryptInit_ex2(ctx, evp_cipher, key, iv, NULL)) {
/* Error */
EVP_CIPHER_CTX_free(ctx);
return 0;
}
if (!EVP_EncryptUpdate(ctx, outbuf, &outlen, (const unsigned char *) intext, strlen(intext))) {
/* Error */
EVP_CIPHER_CTX_free(ctx);
return 0;
}
/*
* Buffer passed to EVP_EncryptFinal() must be after data just
* encrypted to avoid overwriting it.
*/
if (!EVP_EncryptFinal_ex(ctx, outbuf + outlen, &tmplen)) {
/* Error */
EVP_CIPHER_CTX_free(ctx);
return 0;
}
outlen += tmplen;
EVP_CIPHER_CTX_free(ctx);
return 1;
}
static int do_evp_kdf(EVP_KDF *evp_kdf, const OSSL_PARAM params[])
{
int r = 1;
EVP_KDF_CTX *kctx = NULL;
unsigned char derived[32];
kctx = EVP_KDF_CTX_new(evp_kdf);
if (kctx == NULL) {
r = 0;
goto end;
}
if (EVP_KDF_CTX_set_params(kctx, params) <= 0) {
r = 0;
goto end;
}
if (EVP_KDF_derive(kctx, derived, sizeof(derived), NULL) <= 0) {
r = 0;
goto end;
}
end:
EVP_KDF_CTX_free(kctx);
return r;
}
static int do_evp_mac(EVP_MAC *evp_mac, const OSSL_PARAM params[])
{
int r = 1;
const char *key = "mac_key";
char text[] = "Some Crypto Text";
EVP_MAC_CTX *ctx = NULL;
unsigned char buf[4096];
size_t final_l;
if ((ctx = EVP_MAC_CTX_new(evp_mac)) == NULL
|| !EVP_MAC_init(ctx, (const unsigned char *) key, strlen(key),
params)) {
r = 0;
goto end;
}
if (EVP_MAC_CTX_set_params(ctx, params) <= 0) {
r = 0;
goto end;
}
if (!EVP_MAC_update(ctx, (unsigned char *) text, sizeof(text))) {
r = 0;
goto end;
}
if (!EVP_MAC_final(ctx, buf, &final_l, sizeof(buf))) {
r = 0;
goto end;
}
end:
EVP_MAC_CTX_free(ctx);
return r;
}
static int do_evp_rand(EVP_RAND *evp_rand, const OSSL_PARAM params[])
{
int r = 1;
EVP_RAND_CTX *ctx = NULL;
unsigned char buf[4096];
if (!(ctx = EVP_RAND_CTX_new(evp_rand, NULL))) {
r = 0;
goto end;
}
if (EVP_RAND_CTX_set_params(ctx, params) <= 0) {
r = 0;
goto end;
}
if (!EVP_RAND_generate(ctx, buf, sizeof(buf), 0, 0, NULL, 0)) {
r = 0;
goto end;
}
if (!EVP_RAND_reseed(ctx, 0, 0, 0, NULL, 0)) {
r = 0;
goto end;
}
end:
EVP_RAND_CTX_free(ctx);
return r;
}
static int do_evp_sig(EVP_SIGNATURE *evp_sig, const OSSL_PARAM params[])
{
return 0;
}
static int do_evp_asym_cipher(EVP_ASYM_CIPHER *evp_asym_cipher, const OSSL_PARAM params[])
{
return 0;
}
static int do_evp_kem(EVP_KEM *evp_kem, const OSSL_PARAM params[])
{
return 0;
}
static int do_evp_key_exch(EVP_KEYEXCH *evp_kdf, const OSSL_PARAM params[])
{
return 0;
}
static int do_evp_md(EVP_MD *evp_md, const OSSL_PARAM params[])
{
int r = 1;
unsigned char md_value[EVP_MAX_MD_SIZE];
unsigned int md_len;
EVP_MD_CTX *mdctx = NULL;
if (!(mdctx = EVP_MD_CTX_new())) {
r = 0;
goto end;
}
if (!EVP_MD_CTX_set_params(mdctx, params)) {
r = 0;
goto end;
}
if (!EVP_DigestInit_ex2(mdctx, evp_md, NULL)) {
r = 0;
goto end;
}
if (!EVP_DigestUpdate(mdctx, "Test", strlen("Test"))) {
r = 0;
goto end;
}
if (!EVP_DigestFinal_ex(mdctx, md_value, &md_len)) {
r = 0;
goto end;
}
end:
EVP_MD_CTX_free(mdctx);
return r;
}
#define EVP_FUZZ(source, evp, f) \
do { \
evp *alg = sk_##evp##_value(source, *algorithm % sk_##evp##_num(source)); \
OSSL_PARAM *fuzzed_params; \
\
if (alg == NULL) \
break; \
fuzzed_params = fuzz_params((OSSL_PARAM*) evp##_settable_ctx_params(alg), &buf, &len); \
if (fuzzed_params != NULL) \
f(alg, fuzzed_params); \
free_params(fuzzed_params); \
OSSL_PARAM_free(fuzzed_params); \
} while (0);
int FuzzerTestOneInput(const uint8_t *buf, size_t len)
{
int r = 1;
uint64_t *operation = NULL;
int64_t *algorithm = NULL;
if (!read_uint(&buf, &len, &operation)) {
r = 0;
goto end;
}
if (!read_int(&buf, &len, &algorithm)) {
r = 0;
goto end;
}
switch (*operation % 10) {
case 0:
EVP_FUZZ(digests_collection, EVP_MD, do_evp_md);
break;
case 1:
EVP_FUZZ(cipher_collection, EVP_CIPHER, do_evp_cipher);
break;
case 2:
EVP_FUZZ(kdf_collection, EVP_KDF, do_evp_kdf);
break;
case 3:
EVP_FUZZ(mac_collection, EVP_MAC, do_evp_mac);
break;
case 4:
EVP_FUZZ(kem_collection, EVP_KEM, do_evp_kem);
break;
case 5:
EVP_FUZZ(rand_collection, EVP_RAND, do_evp_rand);
break;
case 6:
EVP_FUZZ(asym_ciphers_collection, EVP_ASYM_CIPHER, do_evp_asym_cipher);
break;
case 7:
EVP_FUZZ(signature_collection, EVP_SIGNATURE, do_evp_sig);
break;
case 8:
EVP_FUZZ(keyexch_collection, EVP_KEYEXCH, do_evp_key_exch);
break;
case 9:
/*
Implement and call:
static int do_evp_keymgmt(EVP_KEYMGMT *evp_kdf, const OSSL_PARAM params[])
{
return 0;
}
*/
/* not yet implemented */
break;
default:
r = 0;
goto end;
}
end:
OPENSSL_free(operation);
OPENSSL_free(algorithm);
return r;
}
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