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/**
* Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
* SPDX-License-Identifier: Apache-2.0.
*/
#include <aws/cal/cal.h>
#include <aws/common/allocator.h>
#include <aws/common/logging.h>
#include <aws/common/mutex.h>
#include <aws/common/thread.h>
#include <dlfcn.h>
#include <aws/cal/private/opensslcrypto_common.h>
/*
* OpenSSL 3 has a large amount of interface changes and many of the functions used
* throughout aws-c-cal have become deprecated.
* Lets disable deprecation warnings, so that we can atleast run CI, until we
* can move over to new functions.
*/
#define OPENSSL_SUPPRESS_DEPRECATED
#include <openssl/crypto.h>
static struct openssl_hmac_ctx_table hmac_ctx_table;
static struct openssl_evp_md_ctx_table evp_md_ctx_table;
struct openssl_hmac_ctx_table *g_aws_openssl_hmac_ctx_table = NULL;
struct openssl_evp_md_ctx_table *g_aws_openssl_evp_md_ctx_table = NULL;
static struct aws_allocator *s_libcrypto_allocator = NULL;
#if !defined(OPENSSL_IS_AWSLC) && !defined(OPENSSL_IS_BORINGSSL)
# define OPENSSL_IS_OPENSSL
#endif
/* weak refs to libcrypto functions to force them to at least try to link
* and avoid dead-stripping
*/
#if defined(OPENSSL_IS_AWSLC) || defined(OPENSSL_IS_BORINGSSL)
extern HMAC_CTX *HMAC_CTX_new(void) __attribute__((weak, used));
extern void HMAC_CTX_free(HMAC_CTX *) __attribute__((weak, used));
extern void HMAC_CTX_init(HMAC_CTX *) __attribute__((weak, used));
extern void HMAC_CTX_cleanup(HMAC_CTX *) __attribute__((weak, used));
extern int HMAC_Update(HMAC_CTX *, const unsigned char *, size_t) __attribute__((weak, used));
extern int HMAC_Final(HMAC_CTX *, unsigned char *, unsigned int *) __attribute__((weak, used));
extern int HMAC_Init_ex(HMAC_CTX *, const void *, size_t, const EVP_MD *, ENGINE *) __attribute__((weak, used));
static int s_hmac_init_ex_bssl(HMAC_CTX *ctx, const void *key, size_t key_len, const EVP_MD *md, ENGINE *impl) {
AWS_PRECONDITION(ctx);
int (*init_ex_pt)(HMAC_CTX *, const void *, size_t, const EVP_MD *, ENGINE *) = (int (*)(
HMAC_CTX *, const void *, size_t, const EVP_MD *, ENGINE *))g_aws_openssl_hmac_ctx_table->impl.init_ex_fn;
return init_ex_pt(ctx, key, key_len, md, impl);
}
#else
/* 1.1 */
extern HMAC_CTX *HMAC_CTX_new(void) __attribute__((weak, used));
extern void HMAC_CTX_free(HMAC_CTX *) __attribute__((weak, used));
/* 1.0.2 */
extern void HMAC_CTX_init(HMAC_CTX *) __attribute__((weak, used));
extern void HMAC_CTX_cleanup(HMAC_CTX *) __attribute__((weak, used));
/* common */
extern int HMAC_Update(HMAC_CTX *, const unsigned char *, size_t) __attribute__((weak, used));
extern int HMAC_Final(HMAC_CTX *, unsigned char *, unsigned int *) __attribute__((weak, used));
extern int HMAC_Init_ex(HMAC_CTX *, const void *, int, const EVP_MD *, ENGINE *) __attribute__((weak, used));
static int s_hmac_init_ex_openssl(HMAC_CTX *ctx, const void *key, size_t key_len, const EVP_MD *md, ENGINE *impl) {
AWS_PRECONDITION(ctx);
if (key_len > INT_MAX) {
return 0;
}
/*Note: unlike aws-lc and boringssl, openssl 1.1.1 and 1.0.2 take int as key
len arg. */
int (*init_ex_ptr)(HMAC_CTX *, const void *, int, const EVP_MD *, ENGINE *) =
(int (*)(HMAC_CTX *, const void *, int, const EVP_MD *, ENGINE *))g_aws_openssl_hmac_ctx_table->impl.init_ex_fn;
return init_ex_ptr(ctx, key, (int)key_len, md, impl);
}
#endif /* !OPENSSL_IS_AWSLC && !OPENSSL_IS_BORINGSSL*/
#if !defined(OPENSSL_IS_AWSLC)
/* libcrypto 1.1 stub for init */
static void s_hmac_ctx_init_noop(HMAC_CTX *ctx) {
(void)ctx;
}
/* libcrypto 1.1 stub for clean_up */
static void s_hmac_ctx_clean_up_noop(HMAC_CTX *ctx) {
(void)ctx;
}
#endif
#if defined(OPENSSL_IS_OPENSSL)
/* libcrypto 1.0 shim for new */
static HMAC_CTX *s_hmac_ctx_new(void) {
AWS_PRECONDITION(
g_aws_openssl_hmac_ctx_table->init_fn != s_hmac_ctx_init_noop &&
"libcrypto 1.0 init called on libcrypto 1.1 vtable");
HMAC_CTX *ctx = aws_mem_calloc(s_libcrypto_allocator, 1, 300);
AWS_FATAL_ASSERT(ctx && "Unable to allocate to HMAC_CTX");
g_aws_openssl_hmac_ctx_table->init_fn(ctx);
return ctx;
}
/* libcrypto 1.0 shim for free */
static void s_hmac_ctx_free(HMAC_CTX *ctx) {
AWS_PRECONDITION(ctx);
AWS_PRECONDITION(
g_aws_openssl_hmac_ctx_table->clean_up_fn != s_hmac_ctx_clean_up_noop &&
"libcrypto 1.0 clean_up called on libcrypto 1.1 vtable");
g_aws_openssl_hmac_ctx_table->clean_up_fn(ctx);
aws_mem_release(s_libcrypto_allocator, ctx);
}
#endif /* !OPENSSL_IS_AWSLC */
enum aws_libcrypto_version {
AWS_LIBCRYPTO_NONE = 0,
AWS_LIBCRYPTO_1_0_2,
AWS_LIBCRYPTO_1_1_1,
AWS_LIBCRYPTO_LC,
AWS_LIBCRYPTO_BORINGSSL
};
bool s_resolve_hmac_102(void *module) {
#if defined(OPENSSL_IS_OPENSSL)
hmac_ctx_init init_fn = (hmac_ctx_init)HMAC_CTX_init;
hmac_ctx_clean_up clean_up_fn = (hmac_ctx_clean_up)HMAC_CTX_cleanup;
hmac_update update_fn = (hmac_update)HMAC_Update;
hmac_final final_fn = (hmac_final)HMAC_Final;
hmac_init_ex init_ex_fn = (hmac_init_ex)HMAC_Init_ex;
/* were symbols bound by static linking? */
bool has_102_symbols = init_fn && clean_up_fn && update_fn && final_fn && init_ex_fn;
if (has_102_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static libcrypto 1.0.2 HMAC symbols");
} else {
/* If symbols aren't already found, try to find the requested version */
*(void **)(&init_fn) = dlsym(module, "HMAC_CTX_init");
*(void **)(&clean_up_fn) = dlsym(module, "HMAC_CTX_cleanup");
*(void **)(&update_fn) = dlsym(module, "HMAC_Update");
*(void **)(&final_fn) = dlsym(module, "HMAC_Final");
*(void **)(&init_ex_fn) = dlsym(module, "HMAC_Init_ex");
if (init_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic libcrypto 1.0.2 HMAC symbols");
}
}
if (init_fn) {
hmac_ctx_table.new_fn = (hmac_ctx_new)s_hmac_ctx_new;
hmac_ctx_table.free_fn = s_hmac_ctx_free;
hmac_ctx_table.init_fn = init_fn;
hmac_ctx_table.clean_up_fn = clean_up_fn;
hmac_ctx_table.update_fn = update_fn;
hmac_ctx_table.final_fn = final_fn;
hmac_ctx_table.init_ex_fn = init_ex_fn;
g_aws_openssl_hmac_ctx_table = &hmac_ctx_table;
return true;
}
#endif
return false;
}
bool s_resolve_hmac_111(void *module) {
#if defined(OPENSSL_IS_OPENSSL)
hmac_ctx_new new_fn = (hmac_ctx_new)HMAC_CTX_new;
hmac_ctx_free free_fn = (hmac_ctx_free)HMAC_CTX_free;
hmac_update update_fn = (hmac_update)HMAC_Update;
hmac_final final_fn = (hmac_final)HMAC_Final;
hmac_init_ex init_ex_fn = (hmac_init_ex)HMAC_Init_ex;
/* were symbols bound by static linking? */
bool has_111_symbols = new_fn && free_fn && update_fn && final_fn && init_ex_fn;
if (has_111_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static libcrypto 1.1.1 HMAC symbols");
} else {
*(void **)(&new_fn) = dlsym(module, "HMAC_CTX_new");
*(void **)(&free_fn) = dlsym(module, "HMAC_CTX_free");
*(void **)(&update_fn) = dlsym(module, "HMAC_Update");
*(void **)(&final_fn) = dlsym(module, "HMAC_Final");
*(void **)(&init_ex_fn) = dlsym(module, "HMAC_Init_ex");
if (new_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic libcrypto 1.1.1 HMAC symbols");
}
}
if (new_fn) {
hmac_ctx_table.new_fn = new_fn;
hmac_ctx_table.free_fn = free_fn;
hmac_ctx_table.init_fn = s_hmac_ctx_init_noop;
hmac_ctx_table.clean_up_fn = s_hmac_ctx_clean_up_noop;
hmac_ctx_table.update_fn = update_fn;
hmac_ctx_table.final_fn = final_fn;
hmac_ctx_table.init_ex_fn = s_hmac_init_ex_openssl;
hmac_ctx_table.impl.init_ex_fn = (crypto_generic_fn_ptr)init_ex_fn;
g_aws_openssl_hmac_ctx_table = &hmac_ctx_table;
return true;
}
#endif
return false;
}
bool s_resolve_hmac_lc(void *module) {
#if defined(OPENSSL_IS_AWSLC)
hmac_ctx_init init_fn = (hmac_ctx_init)HMAC_CTX_init;
hmac_ctx_clean_up clean_up_fn = (hmac_ctx_clean_up)HMAC_CTX_cleanup;
hmac_ctx_new new_fn = (hmac_ctx_new)HMAC_CTX_new;
hmac_ctx_free free_fn = (hmac_ctx_free)HMAC_CTX_free;
hmac_update update_fn = (hmac_update)HMAC_Update;
hmac_final final_fn = (hmac_final)HMAC_Final;
hmac_init_ex init_ex_fn = (hmac_init_ex)HMAC_Init_ex;
/* were symbols bound by static linking? */
bool has_awslc_symbols = new_fn && free_fn && update_fn && final_fn && init_fn && init_ex_fn;
/* If symbols aren't already found, try to find the requested version */
/* when built as a shared lib, and multiple versions of libcrypto are possibly
* available (e.g. brazil), select AWS-LC by default for consistency */
if (has_awslc_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static aws-lc HMAC symbols");
} else {
*(void **)(&new_fn) = dlsym(module, "HMAC_CTX_new");
*(void **)(&free_fn) = dlsym(module, "HMAC_CTX_free");
*(void **)(&update_fn) = dlsym(module, "HMAC_Update");
*(void **)(&final_fn) = dlsym(module, "HMAC_Final");
*(void **)(&init_ex_fn) = dlsym(module, "HMAC_Init_ex");
if (new_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic aws-lc HMAC symbols");
}
}
if (new_fn) {
/* Fill out the vtable for the requested version */
hmac_ctx_table.new_fn = new_fn;
hmac_ctx_table.free_fn = free_fn;
hmac_ctx_table.init_fn = init_fn;
hmac_ctx_table.clean_up_fn = clean_up_fn;
hmac_ctx_table.update_fn = update_fn;
hmac_ctx_table.final_fn = final_fn;
hmac_ctx_table.init_ex_fn = s_hmac_init_ex_bssl;
hmac_ctx_table.impl.init_ex_fn = (crypto_generic_fn_ptr)init_ex_fn;
g_aws_openssl_hmac_ctx_table = &hmac_ctx_table;
return true;
}
#endif
return false;
}
bool s_resolve_hmac_boringssl(void *module) {
#if defined(OPENSSL_IS_BORINGSSL)
hmac_ctx_new new_fn = (hmac_ctx_new)HMAC_CTX_new;
hmac_ctx_free free_fn = (hmac_ctx_free)HMAC_CTX_free;
hmac_update update_fn = (hmac_update)HMAC_Update;
hmac_final final_fn = (hmac_final)HMAC_Final;
hmac_init_ex init_ex_fn = (hmac_init_ex)HMAC_Init_ex;
/* were symbols bound by static linking? */
bool has_bssl_symbols = new_fn && free_fn && update_fn && final_fn && init_ex_fn;
if (has_bssl_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static boringssl HMAC symbols");
} else {
*(void **)(&new_fn) = dlsym(module, "HMAC_CTX_new");
*(void **)(&free_fn) = dlsym(module, "HMAC_CTX_free");
*(void **)(&update_fn) = dlsym(module, "HMAC_Update");
*(void **)(&final_fn) = dlsym(module, "HMAC_Final");
*(void **)(&init_ex_fn) = dlsym(module, "HMAC_Init_ex");
if (new_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic boringssl HMAC symbols");
}
}
if (new_fn) {
hmac_ctx_table.new_fn = new_fn;
hmac_ctx_table.free_fn = free_fn;
hmac_ctx_table.init_fn = s_hmac_ctx_init_noop;
hmac_ctx_table.clean_up_fn = s_hmac_ctx_clean_up_noop;
hmac_ctx_table.update_fn = update_fn;
hmac_ctx_table.final_fn = final_fn;
hmac_ctx_table.init_ex_fn = s_hmac_init_ex_bssl;
hmac_ctx_table.impl.init_ex_fn = (crypto_generic_fn_ptr)init_ex_fn;
g_aws_openssl_hmac_ctx_table = &hmac_ctx_table;
return true;
}
#endif
return false;
}
static enum aws_libcrypto_version s_resolve_libcrypto_hmac(enum aws_libcrypto_version version, void *module) {
switch (version) {
case AWS_LIBCRYPTO_LC:
return s_resolve_hmac_lc(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_1_1_1:
return s_resolve_hmac_111(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_1_0_2:
return s_resolve_hmac_102(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_BORINGSSL:
return s_resolve_hmac_boringssl(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_NONE:
AWS_FATAL_ASSERT(!"Attempted to resolve invalid libcrypto HMAC API version AWS_LIBCRYPTO_NONE");
}
return AWS_LIBCRYPTO_NONE;
}
#if !defined(OPENSSL_IS_AWSLC)
/* EVP_MD_CTX API */
/* 1.0.2 NOTE: these are macros in 1.1.x, so we have to undef them to weak link */
# if defined(EVP_MD_CTX_create)
# pragma push_macro("EVP_MD_CTX_create")
# undef EVP_MD_CTX_create
# endif
extern EVP_MD_CTX *EVP_MD_CTX_create(void) __attribute__((weak, used));
static evp_md_ctx_new s_EVP_MD_CTX_create = EVP_MD_CTX_create;
# if defined(EVP_MD_CTX_create)
# pragma pop_macro("EVP_MD_CTX_create")
# endif
# if defined(EVP_MD_CTX_destroy)
# pragma push_macro("EVP_MD_CTX_destroy")
# undef EVP_MD_CTX_destroy
# endif
extern void EVP_MD_CTX_destroy(EVP_MD_CTX *) __attribute__((weak, used));
static evp_md_ctx_free s_EVP_MD_CTX_destroy = EVP_MD_CTX_destroy;
# if defined(EVP_MD_CTX_destroy)
# pragma pop_macro("EVP_MD_CTX_destroy")
# endif
#endif /* !OPENSSL_IS_AWSLC */
extern EVP_MD_CTX *EVP_MD_CTX_new(void) __attribute__((weak, used));
extern void EVP_MD_CTX_free(EVP_MD_CTX *) __attribute__((weak, used));
extern int EVP_DigestInit_ex(EVP_MD_CTX *, const EVP_MD *, ENGINE *) __attribute__((weak, used));
extern int EVP_DigestUpdate(EVP_MD_CTX *, const void *, size_t) __attribute__((weak, used));
extern int EVP_DigestFinal_ex(EVP_MD_CTX *, unsigned char *, unsigned int *) __attribute__((weak, used));
bool s_resolve_md_102(void *module) {
#if !defined(OPENSSL_IS_AWSLC)
evp_md_ctx_new md_create_fn = s_EVP_MD_CTX_create;
evp_md_ctx_free md_destroy_fn = s_EVP_MD_CTX_destroy;
evp_md_ctx_digest_init_ex md_init_ex_fn = EVP_DigestInit_ex;
evp_md_ctx_digest_update md_update_fn = EVP_DigestUpdate;
evp_md_ctx_digest_final_ex md_final_ex_fn = EVP_DigestFinal_ex;
bool has_102_symbols = md_create_fn && md_destroy_fn && md_init_ex_fn && md_update_fn && md_final_ex_fn;
if (has_102_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static libcrypto 1.0.2 EVP_MD symbols");
} else {
*(void **)(&md_create_fn) = dlsym(module, "EVP_MD_CTX_create");
*(void **)(&md_destroy_fn) = dlsym(module, "EVP_MD_CTX_destroy");
*(void **)(&md_init_ex_fn) = dlsym(module, "EVP_DigestInit_ex");
*(void **)(&md_update_fn) = dlsym(module, "EVP_DigestUpdate");
*(void **)(&md_final_ex_fn) = dlsym(module, "EVP_DigestFinal_ex");
if (md_create_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic libcrypto 1.0.2 EVP_MD symbols");
}
}
if (md_create_fn) {
evp_md_ctx_table.new_fn = md_create_fn;
evp_md_ctx_table.free_fn = md_destroy_fn;
evp_md_ctx_table.init_ex_fn = md_init_ex_fn;
evp_md_ctx_table.update_fn = md_update_fn;
evp_md_ctx_table.final_ex_fn = md_final_ex_fn;
g_aws_openssl_evp_md_ctx_table = &evp_md_ctx_table;
return true;
}
#endif
return false;
}
bool s_resolve_md_111(void *module) {
#if !defined(OPENSSL_IS_AWSLC)
evp_md_ctx_new md_new_fn = EVP_MD_CTX_new;
evp_md_ctx_free md_free_fn = EVP_MD_CTX_free;
evp_md_ctx_digest_init_ex md_init_ex_fn = EVP_DigestInit_ex;
evp_md_ctx_digest_update md_update_fn = EVP_DigestUpdate;
evp_md_ctx_digest_final_ex md_final_ex_fn = EVP_DigestFinal_ex;
bool has_111_symbols = md_new_fn && md_free_fn && md_init_ex_fn && md_update_fn && md_final_ex_fn;
if (has_111_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static libcrypto 1.1.1 EVP_MD symbols");
} else {
*(void **)(&md_new_fn) = dlsym(module, "EVP_MD_CTX_new");
*(void **)(&md_free_fn) = dlsym(module, "EVP_MD_CTX_free");
*(void **)(&md_init_ex_fn) = dlsym(module, "EVP_DigestInit_ex");
*(void **)(&md_update_fn) = dlsym(module, "EVP_DigestUpdate");
*(void **)(&md_final_ex_fn) = dlsym(module, "EVP_DigestFinal_ex");
if (md_new_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic libcrypto 1.1.1 EVP_MD symbols");
}
}
if (md_new_fn) {
evp_md_ctx_table.new_fn = md_new_fn;
evp_md_ctx_table.free_fn = md_free_fn;
evp_md_ctx_table.init_ex_fn = md_init_ex_fn;
evp_md_ctx_table.update_fn = md_update_fn;
evp_md_ctx_table.final_ex_fn = md_final_ex_fn;
g_aws_openssl_evp_md_ctx_table = &evp_md_ctx_table;
return true;
}
#endif
return false;
}
bool s_resolve_md_lc(void *module) {
#if defined(OPENSSL_IS_AWSLC)
evp_md_ctx_new md_new_fn = EVP_MD_CTX_new;
evp_md_ctx_new md_create_fn = EVP_MD_CTX_new;
evp_md_ctx_free md_free_fn = EVP_MD_CTX_free;
evp_md_ctx_free md_destroy_fn = EVP_MD_CTX_destroy;
evp_md_ctx_digest_init_ex md_init_ex_fn = EVP_DigestInit_ex;
evp_md_ctx_digest_update md_update_fn = EVP_DigestUpdate;
evp_md_ctx_digest_final_ex md_final_ex_fn = EVP_DigestFinal_ex;
bool has_awslc_symbols =
md_new_fn && md_create_fn && md_free_fn && md_destroy_fn && md_init_ex_fn && md_update_fn && md_final_ex_fn;
if (has_awslc_symbols) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found static aws-lc libcrypto 1.1.1 EVP_MD symbols");
} else {
*(void **)(&md_new_fn) = dlsym(module, "EVP_MD_CTX_new");
*(void **)(&md_free_fn) = dlsym(module, "EVP_MD_CTX_free");
*(void **)(&md_init_ex_fn) = dlsym(module, "EVP_DigestInit_ex");
*(void **)(&md_update_fn) = dlsym(module, "EVP_DigestUpdate");
*(void **)(&md_final_ex_fn) = dlsym(module, "EVP_DigestFinal_ex");
if (md_new_fn) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "found dynamic aws-lc libcrypto 1.1.1 EVP_MD symbols");
}
}
if (md_new_fn) {
/* Add the found symbols to the vtable */
evp_md_ctx_table.new_fn = md_new_fn;
evp_md_ctx_table.free_fn = md_free_fn;
evp_md_ctx_table.init_ex_fn = md_init_ex_fn;
evp_md_ctx_table.update_fn = md_update_fn;
evp_md_ctx_table.final_ex_fn = md_final_ex_fn;
g_aws_openssl_evp_md_ctx_table = &evp_md_ctx_table;
return true;
}
#endif
return false;
}
bool s_resolve_md_boringssl(void *module) {
#if !defined(OPENSSL_IS_AWSLC)
return s_resolve_md_111(module);
#else
return false;
#endif
}
static enum aws_libcrypto_version s_resolve_libcrypto_md(enum aws_libcrypto_version version, void *module) {
switch (version) {
case AWS_LIBCRYPTO_LC:
return s_resolve_md_lc(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_1_1_1:
return s_resolve_md_111(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_1_0_2:
return s_resolve_md_102(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_BORINGSSL:
return s_resolve_md_boringssl(module) ? version : AWS_LIBCRYPTO_NONE;
case AWS_LIBCRYPTO_NONE:
AWS_FATAL_ASSERT(!"Attempted to resolve invalid libcrypto MD API version AWS_LIBCRYPTO_NONE");
}
return AWS_LIBCRYPTO_NONE;
}
static enum aws_libcrypto_version s_resolve_libcrypto_symbols(enum aws_libcrypto_version version, void *module) {
enum aws_libcrypto_version found_version = s_resolve_libcrypto_hmac(version, module);
if (found_version == AWS_LIBCRYPTO_NONE) {
return AWS_LIBCRYPTO_NONE;
}
found_version = s_resolve_libcrypto_md(found_version, module);
if (found_version == AWS_LIBCRYPTO_NONE) {
return AWS_LIBCRYPTO_NONE;
}
return found_version;
}
static enum aws_libcrypto_version s_resolve_libcrypto_lib(void) {
const char *libcrypto_102 = "libcrypto.so.1.0.0";
const char *libcrypto_111 = "libcrypto.so.1.1";
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "loading libcrypto 1.0.2");
void *module = dlopen(libcrypto_102, RTLD_NOW);
if (module) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "resolving against libcrypto 1.0.2");
enum aws_libcrypto_version result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_0_2, module);
if (result == AWS_LIBCRYPTO_1_0_2) {
return result;
}
dlclose(module);
} else {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto 1.0.2 not found");
}
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "loading libcrypto 1.1.1");
module = dlopen(libcrypto_111, RTLD_NOW);
if (module) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "resolving against libcrypto 1.1.1");
enum aws_libcrypto_version result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_1_1, module);
if (result == AWS_LIBCRYPTO_1_1_1) {
return result;
}
dlclose(module);
} else {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto 1.1.1 not found");
}
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "loading libcrypto.so");
module = dlopen("libcrypto.so", RTLD_NOW);
if (module) {
unsigned long (*openssl_version_num)(void) = NULL;
*(void **)(&openssl_version_num) = dlsym(module, "OpenSSL_version_num");
if (openssl_version_num) {
unsigned long version = openssl_version_num();
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto.so reported version is 0x%lx", version);
enum aws_libcrypto_version result = AWS_LIBCRYPTO_NONE;
if (version >= 0x10101000L) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "probing libcrypto.so for aws-lc symbols");
result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_LC, module);
if (result == AWS_LIBCRYPTO_NONE) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "probing libcrypto.so for 1.1.1 symbols");
result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_1_1, module);
}
} else if (version >= 0x10002000L) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "probing libcrypto.so for 1.0.2 symbols");
result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_0_2, module);
} else {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto.so reported version is unsupported");
}
if (result != AWS_LIBCRYPTO_NONE) {
return result;
}
} else {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "Unable to determine version of libcrypto.so");
}
dlclose(module);
} else {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "libcrypto.so not found");
}
return AWS_LIBCRYPTO_NONE;
}
static void *s_libcrypto_module = NULL;
static enum aws_libcrypto_version s_resolve_libcrypto(void) {
/* Try to auto-resolve against what's linked in/process space */
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "searching process and loaded modules");
void *process = dlopen(NULL, RTLD_NOW);
AWS_FATAL_ASSERT(process && "Unable to load symbols from process space");
enum aws_libcrypto_version result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_LC, process);
if (result == AWS_LIBCRYPTO_NONE) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "did not find aws-lc symbols linked");
result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_BORINGSSL, process);
}
if (result == AWS_LIBCRYPTO_NONE) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "did not find boringssl symbols linked");
result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_0_2, process);
}
if (result == AWS_LIBCRYPTO_NONE) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "did not find libcrypto 1.0.2 symbols linked");
result = s_resolve_libcrypto_symbols(AWS_LIBCRYPTO_1_1_1, process);
}
dlclose(process);
if (result == AWS_LIBCRYPTO_NONE) {
AWS_LOGF_DEBUG(AWS_LS_CAL_LIBCRYPTO_RESOLVE, "did not find libcrypto 1.1.1 symbols linked");
AWS_LOGF_DEBUG(
AWS_LS_CAL_LIBCRYPTO_RESOLVE,
"libcrypto symbols were not statically linked, searching for shared libraries");
result = s_resolve_libcrypto_lib();
}
return result;
}
/* Ignore warnings about how CRYPTO_get_locking_callback() always returns NULL on 1.1.1 */
#if !defined(__GNUC__) || (__GNUC__ * 100 + __GNUC_MINOR__ * 10 > 410)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Waddress"
#endif
/* Openssl 1.0.x requires special handling for its locking callbacks or else it's not thread safe */
#if !defined(OPENSSL_IS_AWSLC) && !defined(OPENSSL_IS_BORINGSSL)
static struct aws_mutex *s_libcrypto_locks = NULL;
static void s_locking_fn(int mode, int n, const char *unused0, int unused1) {
(void)unused0;
(void)unused1;
if (mode & CRYPTO_LOCK) {
aws_mutex_lock(&s_libcrypto_locks[n]);
} else {
aws_mutex_unlock(&s_libcrypto_locks[n]);
}
}
static unsigned long s_id_fn(void) {
return (unsigned long)aws_thread_current_thread_id();
}
#endif
void aws_cal_platform_init(struct aws_allocator *allocator) {
int version = s_resolve_libcrypto();
AWS_FATAL_ASSERT(version != AWS_LIBCRYPTO_NONE && "libcrypto could not be resolved");
AWS_FATAL_ASSERT(g_aws_openssl_evp_md_ctx_table);
AWS_FATAL_ASSERT(g_aws_openssl_hmac_ctx_table);
s_libcrypto_allocator = allocator;
#if !defined(OPENSSL_IS_AWSLC) && !defined(OPENSSL_IS_BORINGSSL)
/* Ensure that libcrypto 1.0.2 has working locking mechanisms. This code is macro'ed
* by libcrypto to be a no-op on 1.1.1 */
if (!CRYPTO_get_locking_callback()) {
/* on 1.1.1 this is a no-op */
CRYPTO_set_locking_callback(s_locking_fn);
if (CRYPTO_get_locking_callback() == s_locking_fn) {
s_libcrypto_locks = aws_mem_acquire(allocator, sizeof(struct aws_mutex) * CRYPTO_num_locks());
AWS_FATAL_ASSERT(s_libcrypto_locks);
size_t lock_count = (size_t)CRYPTO_num_locks();
for (size_t i = 0; i < lock_count; ++i) {
aws_mutex_init(&s_libcrypto_locks[i]);
}
}
}
if (!CRYPTO_get_id_callback()) {
CRYPTO_set_id_callback(s_id_fn);
}
#endif
}
void aws_cal_platform_clean_up(void) {
#if !defined(OPENSSL_IS_AWSLC) && !defined(OPENSSL_IS_BORINGSSL)
if (CRYPTO_get_locking_callback() == s_locking_fn) {
CRYPTO_set_locking_callback(NULL);
size_t lock_count = (size_t)CRYPTO_num_locks();
for (size_t i = 0; i < lock_count; ++i) {
aws_mutex_clean_up(&s_libcrypto_locks[i]);
}
aws_mem_release(s_libcrypto_allocator, s_libcrypto_locks);
}
if (CRYPTO_get_id_callback() == s_id_fn) {
CRYPTO_set_id_callback(NULL);
}
#endif
#if defined(OPENSSL_IS_AWSLC)
AWSLC_thread_local_clear();
AWSLC_thread_local_shutdown();
#endif
if (s_libcrypto_module) {
dlclose(s_libcrypto_module);
}
s_libcrypto_allocator = NULL;
}
void aws_cal_platform_thread_clean_up(void) {
#if defined(OPENSSL_IS_AWSLC)
AWSLC_thread_local_clear();
#endif
}
#if !defined(__GNUC__) || (__GNUC__ >= 4 && __GNUC_MINOR__ > 1)
# pragma GCC diagnostic pop
#endif
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