diffie-hellman: Verify public DH values in backends

src/libstrongswan/plugins/gcrypt/gcrypt_dh.c

@@ -79,6 +79,11 @@ METHOD(diffie_hellman_t, set_other_public_value, bool,
 	gcry_mpi_t p_min_1;
 	gcry_error_t err;
 
+	if (!diffie_hellman_verify_value(this->group, value))
+	{
+		return FALSE;
+	}
+
 	if (this->yb)
 	{
 		gcry_mpi_release(this->yb);

src/libstrongswan/plugins/gmp/gmp_diffie_hellman.c

@@ -90,6 +90,11 @@ METHOD(diffie_hellman_t, set_other_public_value, bool,
 {
 	mpz_t p_min_1;
 
+	if (!diffie_hellman_verify_value(this->group, value))
+	{
+		return FALSE;
+	}
+
 	mpz_init(p_min_1);
 	mpz_sub_ui(p_min_1, this->p, 1);
 

src/libstrongswan/plugins/openssl/openssl_diffie_hellman.c

@@ -92,6 +92,11 @@ METHOD(diffie_hellman_t, set_other_public_value, bool,
 {
 	int len;
 
+	if (!diffie_hellman_verify_value(this->group, value))
+	{
+		return FALSE;
+	}
+
 	BN_bin2bn(value.ptr, value.len, this->pub_key);
 	chunk_clear(&this->shared_secret);
 	this->shared_secret.ptr = malloc(DH_size(this->dh));

src/libstrongswan/plugins/openssl/openssl_ec_diffie_hellman.c

@@ -219,6 +219,11 @@ error:
 METHOD(diffie_hellman_t, set_other_public_value, bool,
 	private_openssl_ec_diffie_hellman_t *this, chunk_t value)
 {
+	if (!diffie_hellman_verify_value(this->group, value))
+	{
+		return FALSE;
+	}
+
 	if (!chunk2ecp(this->ec_group, value, this->pub_key))
 	{
 		DBG1(DBG_LIB, "ECDH public value is malformed");

src/libstrongswan/plugins/pkcs11/pkcs11_dh.c

@@ -116,6 +116,11 @@ static bool derive_secret(private_pkcs11_dh_t *this, chunk_t other)
 METHOD(diffie_hellman_t, set_other_public_value, bool,
 	private_pkcs11_dh_t *this, chunk_t value)
 {
+	if (!diffie_hellman_verify_value(this->group, value))
+	{
+		return FALSE;
+	}
+
 	switch (this->group)
 	{
 		case ECP_192_BIT: