Avoid unresolved symbols from libcrypto when compiled with OQS_DLOPEN…

…_OPENSSL (open-quantum-safe#2043)

* Do not assume OpenSSL memory functions when libcrypto is dlopened

Otherwise, when the OQS_DLOPEN_OPENSSL is defined but OpenSSL is
used only partially, e.g., with OQS_USE_SHA3_OPENSSL=ON, there will be
some unresolved symbols in the final artifact:

```
$ cmake -GNinja -DBUILD_SHARED_LIBS=ON -DOQS_USE_AES_OPENSSL=ON -DOQS_USE_AES_INSTRUCTIONS=OFF -DOQS_DIST_BUILD=ON -DOQS_USE_SHA3_OPENSSL=ON -DOQS_DLOPEN_OPENSSL=ON -DCMAKE_BUILD_TYPE=Debug -LAH ..
$ ninja
$ nm -g lib/liboqs.so.0.12.1-dev | grep '^[[:space:]]*U '
                 U __assert_fail@GLIBC_2.2.5
                 U CRYPTO_free
                 U CRYPTO_malloc
                 U dlopen@GLIBC_2.34
                 U dlsym@GLIBC_2.34
```

Signed-off-by: Daiki Ueno <[email protected]>

* Wrap OpenSSL memory functions with OSSL_FUNC

This enables those OpenSSL memory functions can be either resolved at
build time or at run-time through dlopen. Note that we use CRYPTO_*
functions instead of OPENSSL_* as the latter are defined as a macro
and cannot be dynamically resolved.

Signed-off-by: Daiki Ueno <[email protected]>

---------

Signed-off-by: Daiki Ueno <[email protected]>

src/common/common.c

@@ -299,8 +299,8 @@ OQS_API void OQS_MEM_secure_free(void *ptr, size_t len) {
 }
 
 OQS_API void OQS_MEM_insecure_free(void *ptr) {
-#if (defined(OQS_USE_OPENSSL) || defined(OQS_DLOPEN_OPENSSL)) && defined(OPENSSL_VERSION_NUMBER)
-	OPENSSL_free(ptr);
+#if defined(OQS_USE_OPENSSL) && defined(OPENSSL_VERSION_NUMBER)
+	OSSL_FUNC(CRYPTO_free)(ptr, OPENSSL_FILE, OPENSSL_LINE);
 #else
 	free(ptr); // IGNORE memory-check
 #endif
@@ -313,15 +313,15 @@ void *OQS_MEM_aligned_alloc(size_t alignment, size_t size) {
 		return NULL;
 	}
 	const size_t offset = alignment - 1 + sizeof(uint8_t);
-	uint8_t *buffer = OPENSSL_malloc(size + offset);
+	uint8_t *buffer = OSSL_FUNC(CRYPTO_malloc)(size + offset, OPENSSL_FILE, OPENSSL_LINE);
 	if (!buffer) {
 		return NULL;
 	}
 	uint8_t *ptr = (uint8_t *)(((uintptr_t)(buffer) + offset) & ~(alignment - 1));
 	ptrdiff_t diff = ptr - buffer;
 	if (diff > UINT8_MAX) {
 		// Free and return NULL if alignment is too large
-		OPENSSL_free(buffer);
+		OSSL_FUNC(CRYPTO_free)(buffer, OPENSSL_FILE, OPENSSL_LINE);
 		errno = EINVAL;
 		return NULL;
 	}
@@ -396,7 +396,7 @@ void OQS_MEM_aligned_free(void *ptr) {
 #if defined(OQS_USE_OPENSSL)
 	// Use OpenSSL's free function
 	uint8_t *u8ptr = ptr;
-	OPENSSL_free(u8ptr - u8ptr[-1]);
+	OSSL_FUNC(CRYPTO_free)(u8ptr - u8ptr[-1], OPENSSL_FILE, OPENSSL_LINE);
 #elif defined(OQS_HAVE_ALIGNED_ALLOC) || defined(OQS_HAVE_POSIX_MEMALIGN) || defined(OQS_HAVE_MEMALIGN)
 	free(ptr); // IGNORE memory-check
 #elif defined(__MINGW32__) || defined(__MINGW64__)
@@ -410,3 +410,28 @@ void OQS_MEM_aligned_free(void *ptr) {
 	free(u8ptr - u8ptr[-1]); // IGNORE memory-check
 #endif
 }
+
+OQS_API void *OQS_MEM_malloc(size_t size) {
+#if defined(OQS_USE_OPENSSL)
+	return OSSL_FUNC(CRYPTO_malloc)(size, OPENSSL_FILE, OPENSSL_LINE);
+#else
+	return malloc(size); // IGNORE memory-check
+#endif
+}
+
+OQS_API void *OQS_MEM_calloc(size_t num_elements, size_t element_size) {
+#if defined(OQS_USE_OPENSSL)
+	return OSSL_FUNC(CRYPTO_zalloc)(num_elements * element_size,
+	                                OPENSSL_FILE, OPENSSL_LINE);
+#else
+	return calloc(num_elements, element_size); // IGNORE memory-check
+#endif
+}
+
+OQS_API char *OQS_MEM_strdup(const char *str) {
+#if defined(OQS_USE_OPENSSL)
+	return OSSL_FUNC(CRYPTO_strdup)(str, OPENSSL_FILE, OPENSSL_LINE);
+#else
+	return strdup(str); // IGNORE memory-check
+#endif
+}

src/common/common.h

@@ -19,62 +19,6 @@
 extern "C" {
 #endif
 
-/**
- * @brief Memory allocation and deallocation functions.
- *
- * These macros provide a unified interface for memory operations,
- * using OpenSSL functions when OQS_USE_OPENSSL is defined, and
- * standard C library functions otherwise.
- */
-#if (defined(OQS_USE_OPENSSL) || defined(OQS_DLOPEN_OPENSSL)) &&               \
-    defined(OPENSSL_VERSION_NUMBER)
-#include <openssl/crypto.h>
-
-/**
- * Allocates memory of a given size.
- * @param size The size of the memory to be allocated in bytes.
- * @return A pointer to the allocated memory.
- */
-#define OQS_MEM_malloc(size) OPENSSL_malloc(size)
-
-/**
- * Allocates memory for an array of elements of a given size.
- * @param num_elements The number of elements to allocate.
- * @param element_size The size of each element in bytes.
- * @return A pointer to the allocated memory.
- */
-#define OQS_MEM_calloc(num_elements, element_size)                             \
-  OPENSSL_zalloc((num_elements) * (element_size))
-/**
- * Duplicates a string.
- * @param str The string to be duplicated.
- * @return A pointer to the newly allocated string.
- */
-#define OQS_MEM_strdup(str) OPENSSL_strdup(str)
-#else
-/**
- * Allocates memory of a given size.
- * @param size The size of the memory to be allocated in bytes.
- * @return A pointer to the allocated memory.
- */
-#define OQS_MEM_malloc(size) malloc(size) // IGNORE memory-check
-
-/**
- * Allocates memory for an array of elements of a given size.
- * @param num_elements The number of elements to allocate.
- * @param element_size The size of each element in bytes.
- * @return A pointer to the allocated memory.
- */
-#define OQS_MEM_calloc(num_elements, element_size)                             \
-  calloc(num_elements, element_size)    // IGNORE memory-check
-/**
- * Duplicates a string.
- * @param str The string to be duplicated.
- * @return A pointer to the newly allocated string.
- */
-#define OQS_MEM_strdup(str) strdup(str) // IGNORE memory-check
-#endif
-
 /**
  * Macro for terminating the program if x is
  * a null pointer.
@@ -236,6 +180,36 @@ OQS_API void OQS_destroy(void);
  */
 OQS_API const char *OQS_version(void);
 
+/**
+ * @brief Memory allocation and deallocation functions.
+ *
+ * These functions provide a unified interface for memory operations,
+ * using OpenSSL functions when OQS_USE_OPENSSL is defined, and
+ * standard C library functions otherwise.
+ */
+
+/**
+ * Allocates memory of a given size.
+ * @param size The size of the memory to be allocated in bytes.
+ * @return A pointer to the allocated memory.
+ */
+OQS_API void *OQS_MEM_malloc(size_t size);
+
+/**
+ * Allocates memory for an array of elements of a given size.
+ * @param num_elements The number of elements to allocate.
+ * @param element_size The size of each element in bytes.
+ * @return A pointer to the allocated memory.
+ */
+OQS_API void *OQS_MEM_calloc(size_t num_elements, size_t element_size);
+
+/**
+ * Duplicates a string.
+ * @param str The string to be duplicated.
+ * @return A pointer to the newly allocated string.
+ */
+OQS_API char *OQS_MEM_strdup(const char *str);
+
 /**
  * Constant time comparison of byte sequences `a` and `b` of length `len`.
  * Returns 0 if the byte sequences are equal or if `len`=0.

src/common/ossl_functions.h

@@ -60,4 +60,8 @@ VOID_FUNC(void, OPENSSL_cleanse, (void *ptr, size_t len), (ptr, len))
 FUNC(int, RAND_bytes, (unsigned char *buf, int num), (buf, num))
 FUNC(int, RAND_poll, (void), ())
 FUNC(int, RAND_status, (void), ())
-VOID_FUNC(void, OPENSSL_thread_stop, (void), ())
+VOID_FUNC(void, OPENSSL_thread_stop, (void), ())
+FUNC(void *, CRYPTO_malloc, (size_t num, const char *file, int line), (num, file, line))
+FUNC(void *, CRYPTO_zalloc, (size_t num, const char *file, int line), (num, file, line))
+FUNC(char *, CRYPTO_strdup, (const char *str, const char *file, int line), (str, file, line))
+VOID_FUNC(void, CRYPTO_free, (void *ptr, const char *file, int line), (ptr, file, line))

src/common/ossl_helpers.h

@@ -6,6 +6,7 @@
 extern "C" {
 #endif
 
+#include <openssl/crypto.h>
 #include <openssl/err.h>
 #include <openssl/evp.h>
 #include <openssl/rand.h>