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Add negative-count and NULL checks to group-setting and shared-cipher APIs #10249

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Add negative-count and NULL checks to group-setting and shared-cipher APIs #10249

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8cd77b5
Fix negative count and NULL pointer checks in group-setting and share…
ColtonWilley Apr 14, 2026
d789341
Add regression tests for group-setting and shared-cipher API guards
ColtonWilley Apr 28, 2026
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12 changes: 7 additions & 5 deletions src/ssl.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1274,10 +1274,12 @@ const char* wolfSSL_get_shared_ciphers(WOLFSSL* ssl, char* buf, int len)
{
const char* cipher;

if (ssl == NULL || len <= 0)
if (ssl == NULL || buf == NULL || len <= 0)
return NULL;

cipher = wolfSSL_get_cipher_name_iana(ssl);
if (cipher == NULL)
return NULL;
len = (int)min((word32)len, (word32)(XSTRLEN(cipher) + 1));
XMEMCPY(buf, cipher, (size_t)len);
return buf;
Expand Down Expand Up @@ -3302,8 +3304,8 @@ int wolfSSL_CTX_set1_groups(WOLFSSL_CTX* ctx, int* groups,
int i;
int _groups[WOLFSSL_MAX_GROUP_COUNT];
WOLFSSL_ENTER("wolfSSL_CTX_set1_groups");
if (count == 0) {
WOLFSSL_MSG("Group count is zero");
if (groups == NULL || count <= 0) {
WOLFSSL_MSG("Group count is zero or negative");
return WOLFSSL_FAILURE;
}
if (count > WOLFSSL_MAX_GROUP_COUNT) {
Expand Down Expand Up @@ -3341,8 +3343,8 @@ int wolfSSL_set1_groups(WOLFSSL* ssl, int* groups, int count)
int i;
int _groups[WOLFSSL_MAX_GROUP_COUNT];
WOLFSSL_ENTER("wolfSSL_CTX_set1_groups");
if (count == 0) {
WOLFSSL_MSG("Group count is zero");
if (groups == NULL || count <= 0) {
WOLFSSL_MSG("Group count is zero or negative");
return WOLFSSL_FAILURE;
}
if (count > WOLFSSL_MAX_GROUP_COUNT) {
Expand Down
6 changes: 4 additions & 2 deletions src/tls.c
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Original file line number Diff line number Diff line change
Expand Up @@ -405,7 +405,8 @@ int wolfSSL_CTX_set_groups(WOLFSSL_CTX* ctx, int* groups, int count)
int ret, i;

WOLFSSL_ENTER("wolfSSL_CTX_set_groups");
if (ctx == NULL || groups == NULL || count > WOLFSSL_MAX_GROUP_COUNT)
if (ctx == NULL || groups == NULL || count < 0 ||
count > WOLFSSL_MAX_GROUP_COUNT)
return BAD_FUNC_ARG;
if (!IsTLS_ex(ctx->method->version))
return BAD_FUNC_ARG;
Expand Down Expand Up @@ -450,7 +451,8 @@ int wolfSSL_set_groups(WOLFSSL* ssl, int* groups, int count)
int ret, i;

WOLFSSL_ENTER("wolfSSL_set_groups");
if (ssl == NULL || groups == NULL || count > WOLFSSL_MAX_GROUP_COUNT)
if (ssl == NULL || groups == NULL || count < 0 ||
count > WOLFSSL_MAX_GROUP_COUNT)
return BAD_FUNC_ARG;
if (!IsTLS_ex(ssl->version))
return BAD_FUNC_ARG;
Expand Down
26 changes: 26 additions & 0 deletions tests/api/test_tls.c
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Expand Up @@ -857,3 +857,29 @@ int test_tls_set_curves_list_ecc_fallback(void)
return EXPECT_RESULT();
}

int test_wolfSSL_get_shared_ciphers(void)
{
EXPECT_DECLS;
#if !defined(WOLFSSL_NO_TLS12) && !defined(NO_TLS)
#ifndef NO_WOLFSSL_CLIENT
WOLFSSL_CTX* ctx = NULL;
WOLFSSL* ssl = NULL;
char buf[32];

ExpectNotNull(ctx = wolfSSL_CTX_new(wolfTLSv1_2_client_method()));
ExpectNotNull(ssl = wolfSSL_new(ctx));

/* NULL ssl - pre-existing guard; pins the contract. */
ExpectNull(wolfSSL_get_shared_ciphers(NULL, buf, sizeof(buf)));
/* NULL buf - primary regression case (pre-fix: XMEMCPY(NULL, ...) crash). */
ExpectNull(wolfSSL_get_shared_ciphers(ssl, NULL, sizeof(buf)));
/* len == 0 - pre-existing guard; pins the contract. */
ExpectNull(wolfSSL_get_shared_ciphers(ssl, buf, 0));

wolfSSL_free(ssl);
wolfSSL_CTX_free(ctx);
#endif /* NO_WOLFSSL_CLIENT */
#endif
return EXPECT_RESULT();
}

4 changes: 3 additions & 1 deletion tests/api/test_tls.h
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Original file line number Diff line number Diff line change
Expand Up @@ -32,6 +32,7 @@ int test_tls12_bad_cv_sig_alg(void);
int test_tls12_no_null_compression(void);
int test_tls12_etm_failed_resumption(void);
int test_tls_set_curves_list_ecc_fallback(void);
int test_wolfSSL_get_shared_ciphers(void);

#define TEST_TLS_DECLS \
TEST_DECL_GROUP("tls", test_utils_memio_move_message), \
Expand All @@ -43,6 +44,7 @@ int test_tls_set_curves_list_ecc_fallback(void);
TEST_DECL_GROUP("tls", test_tls12_bad_cv_sig_alg), \
TEST_DECL_GROUP("tls", test_tls12_no_null_compression), \
TEST_DECL_GROUP("tls", test_tls12_etm_failed_resumption), \
TEST_DECL_GROUP("tls", test_tls_set_curves_list_ecc_fallback)
TEST_DECL_GROUP("tls", test_tls_set_curves_list_ecc_fallback), \
TEST_DECL_GROUP("tls", test_wolfSSL_get_shared_ciphers)

#endif /* TESTS_API_TEST_TLS_H */
8 changes: 8 additions & 0 deletions tests/api/test_tls13.c
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Original file line number Diff line number Diff line change
Expand Up @@ -587,6 +587,8 @@ int test_tls13_apis(void)
#endif
ExpectIntEQ(wolfSSL_CTX_set_groups(clientCtx, groups,
WOLFSSL_MAX_GROUP_COUNT + 1), WC_NO_ERR_TRACE(BAD_FUNC_ARG));
ExpectIntEQ(wolfSSL_CTX_set_groups(clientCtx, groups, -1),
WC_NO_ERR_TRACE(BAD_FUNC_ARG));
ExpectIntEQ(wolfSSL_CTX_set_groups(clientCtx, groups, numGroups),
WOLFSSL_SUCCESS);
ExpectIntEQ(wolfSSL_CTX_set_groups(clientCtx, bad_groups, numGroups),
Expand Down Expand Up @@ -614,6 +616,8 @@ int test_tls13_apis(void)
#endif
ExpectIntEQ(wolfSSL_set_groups(clientSsl, groups,
WOLFSSL_MAX_GROUP_COUNT + 1), WC_NO_ERR_TRACE(BAD_FUNC_ARG));
ExpectIntEQ(wolfSSL_set_groups(clientSsl, groups, -1),
WC_NO_ERR_TRACE(BAD_FUNC_ARG));
ExpectIntEQ(wolfSSL_set_groups(clientSsl, groups, numGroups),
WOLFSSL_SUCCESS);
ExpectIntEQ(wolfSSL_set_groups(clientSsl, bad_groups, numGroups),
Expand Down Expand Up @@ -645,6 +649,10 @@ int test_tls13_apis(void)
WOLFSSL_MAX_GROUP_COUNT + 1), WC_NO_ERR_TRACE(WOLFSSL_FAILURE));
ExpectIntEQ(wolfSSL_set1_groups(clientSsl, too_many_groups,
WOLFSSL_MAX_GROUP_COUNT + 1), WC_NO_ERR_TRACE(WOLFSSL_FAILURE));
ExpectIntEQ(wolfSSL_CTX_set1_groups(clientCtx, NULL, 1),
WC_NO_ERR_TRACE(WOLFSSL_FAILURE));
ExpectIntEQ(wolfSSL_set1_groups(clientSsl, NULL, 1),
WC_NO_ERR_TRACE(WOLFSSL_FAILURE));
#endif
#ifndef NO_WOLFSSL_CLIENT
#ifndef WOLFSSL_NO_TLS12
Expand Down