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Lock globalRNGMutex around all shared globalRNG access in OpenSSL-compat RNG

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This commit is contained in:
Yosuke Shimizu
2026-07-01 09:48:07 +09:00
parent a4aab71ffe
commit 768a98088d
2 changed files with 62 additions and 26 deletions
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src/ssl.c
+52 -24
View File
@@ -15733,7 +15733,11 @@ const char* wolfSSL_RAND_file_name(char* fname, unsigned long len)
}
/* Writes 1024 bytes from the RNG to the given file name.
#ifndef WOLFSSL_RAND_WRITE_FILE_BUF_SZ
#define WOLFSSL_RAND_WRITE_FILE_BUF_SZ 1024
#endif
/* Writes WOLFSSL_RAND_WRITE_FILE_BUF_SZ bytes (1024 by default) from the RNG
* to the given file name.
*
* fname name of file to write to
*
@@ -15752,16 +15756,16 @@ int wolfSSL_RAND_write_file(const char* fname)
#ifndef NO_FILESYSTEM
{
#ifndef WOLFSSL_SMALL_STACK
unsigned char buf[1024];
unsigned char buf[WOLFSSL_RAND_WRITE_FILE_BUF_SZ];
#else
unsigned char* buf = (unsigned char *)XMALLOC(1024, NULL,
DYNAMIC_TYPE_TMP_BUFFER);
unsigned char* buf = (unsigned char *)XMALLOC(
WOLFSSL_RAND_WRITE_FILE_BUF_SZ, NULL, DYNAMIC_TYPE_TMP_BUFFER);
if (buf == NULL) {
WOLFSSL_MSG("malloc failed");
return WOLFSSL_FAILURE;
}
#endif
bytes = 1024; /* default size of buf */
bytes = WOLFSSL_RAND_WRITE_FILE_BUF_SZ;
if (initGlobalRNG == 0 && wolfSSL_RAND_Init() != WOLFSSL_SUCCESS) {
WOLFSSL_MSG("No RNG to use");
@@ -15769,13 +15773,22 @@ int wolfSSL_RAND_write_file(const char* fname)
return 0;
}
if (wc_LockMutex(&globalRNGMutex) != 0) {
WOLFSSL_MSG("Bad Lock Mutex rng");
WC_FREE_VAR_EX(buf, NULL, DYNAMIC_TYPE_TMP_BUFFER);
return 0;
}
if (wc_RNG_GenerateBlock(&globalRNG, buf, (word32)bytes) != 0) {
wc_UnLockMutex(&globalRNGMutex);
WOLFSSL_MSG("Error generating random buffer");
bytes = 0;
}
else {
XFILE f;
wc_UnLockMutex(&globalRNGMutex);
#ifdef WOLFSSL_CHECK_MEM_ZERO
wc_MemZero_Add("wolfSSL_RAND_write_file buf", buf, bytes);
#endif
@@ -15791,7 +15804,9 @@ int wolfSSL_RAND_write_file(const char* fname)
XFCLOSE(f);
}
}
ForceZero(buf, (word32)bytes);
/* wipe the whole buffer, not just (word32)bytes: error paths set
* bytes = 0 but the buffer may still hold generated random data */
ForceZero(buf, WOLFSSL_RAND_WRITE_FILE_BUF_SZ);
#ifdef WOLFSSL_SMALL_STACK
XFREE(buf, NULL, DYNAMIC_TYPE_TMP_BUFFER);
#elif defined(WOLFSSL_CHECK_MEM_ZERO)
@@ -15925,21 +15940,30 @@ int wolfSSL_RAND_egd(const char* nm)
WOLFSSL_MSG("Error with initializing global RNG structure");
ret = WOLFSSL_FATAL_ERROR;
}
else if (wc_RNG_DRBG_Reseed(&globalRNG, (const byte*) buf, bytes)
!= 0) {
WOLFSSL_MSG("Error with reseeding DRBG structure");
else if (wc_LockMutex(&globalRNGMutex) != 0) {
WOLFSSL_MSG("Bad Lock Mutex rng");
ret = WOLFSSL_FATAL_ERROR;
}
#ifdef SHOW_SECRETS
else { /* print out entropy found only when no error occurred */
word32 i;
printf("EGD Entropy = ");
for (i = 0; i < bytes; i++) {
printf("%02X", buf[i]);
else {
if (wc_RNG_DRBG_Reseed(&globalRNG, (const byte*) buf, bytes)
!= 0) {
WOLFSSL_MSG("Error with reseeding DRBG structure");
ret = WOLFSSL_FATAL_ERROR;
}
printf("\n");
wc_UnLockMutex(&globalRNGMutex);
#ifdef SHOW_SECRETS
/* print out entropy found only when no error occurred */
if (ret == WOLFSSL_SUCCESS) {
word32 i;
printf("EGD Entropy = ");
for (i = 0; i < bytes; i++) {
printf("%02X", buf[i]);
}
printf("\n");
}
#endif
}
#endif
}
ForceZero(buf, bytes);
@@ -16167,18 +16191,21 @@ int wolfSSL_RAND_poll(void)
WOLFSSL_MSG("Global RNG no Init");
return WOLFSSL_FAILURE;
}
/* lock intentionally covers wc_GenerateSeed as well, since it writes
* globalRNG.seed; do not narrow this scope or the seed write races */
if (wc_LockMutex(&globalRNGMutex) != 0) {
WOLFSSL_MSG("Bad Lock Mutex rng");
return WOLFSSL_FAILURE;
}
ret = wc_GenerateSeed(&globalRNG.seed, entropy, entropy_sz);
if (ret != 0) {
WOLFSSL_MSG("Bad wc_RNG_GenerateBlock");
WOLFSSL_MSG("Bad wc_GenerateSeed");
ret = WOLFSSL_FAILURE;
}
else {
#ifdef HAVE_HASHDRBG
if (wc_LockMutex(&globalRNGMutex) != 0) {
WOLFSSL_MSG("Bad Lock Mutex rng");
return ret;
}
ret = wc_RNG_DRBG_Reseed(&globalRNG, entropy, entropy_sz);
if (ret != 0) {
WOLFSSL_MSG("Error reseeding DRBG");
@@ -16187,7 +16214,6 @@ int wolfSSL_RAND_poll(void)
else {
ret = WOLFSSL_SUCCESS;
}
wc_UnLockMutex(&globalRNGMutex);
#elif defined(HAVE_INTEL_RDRAND)
WOLFSSL_MSG("Not polling with RAND_poll, RDRAND used without "
"HAVE_HASHDRBG");
@@ -16198,6 +16224,8 @@ int wolfSSL_RAND_poll(void)
#endif
}
wc_UnLockMutex(&globalRNGMutex);
return ret;
}
src/ssl_p7p12.c
+10 -2
View File
@@ -1560,11 +1560,19 @@ int wolfSSL_SMIME_write_PKCS7(WOLFSSL_BIO* out, PKCS7* pkcs7, WOLFSSL_BIO* in,
ret = 0;
}
if ((ret > 0) && (wc_LockMutex(&globalRNGMutex) != 0)) {
WOLFSSL_MSG("Bad Lock Mutex rng");
ret = 0;
}
/* no need to generate random byte for null terminator (size-1) */
if ((ret > 0) && (wc_RNG_GenerateBlock(&globalRNG, (byte*)boundary,
sizeof(boundary) - 1 ) != 0)) {
if (ret > 0) {
if (wc_RNG_GenerateBlock(&globalRNG, (byte*)boundary,
sizeof(boundary) - 1 ) != 0) {
WOLFSSL_MSG("Error in wc_RNG_GenerateBlock");
ret = 0;
}
wc_UnLockMutex(&globalRNGMutex);
}
if (ret > 0) {