Verify parameter retrieval functions.

New functions to retrieve internal pointers to X509_VERIFY_PARAM
for SSL_CTX and SSL structures.
(cherry picked from commit be0c9270690ed9c1799900643cab91de146de857)

ssl/ssl.h

@@ -2261,6 +2261,9 @@ int SSL_set_trust(SSL *s, int trust);
 int SSL_CTX_set1_param(SSL_CTX *ctx, X509_VERIFY_PARAM *vpm);
 int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm);
 
+X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx);
+X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl);
+
 #ifndef OPENSSL_NO_SRP
 int SSL_CTX_set_srp_username(SSL_CTX *ctx,char *name);
 int SSL_CTX_set_srp_password(SSL_CTX *ctx,char *password);

ssl/ssl_lib.c

@@ -536,6 +536,16 @@ int SSL_set1_param(SSL *ssl, X509_VERIFY_PARAM *vpm)
 	return X509_VERIFY_PARAM_set1(ssl->param, vpm);
 	}
 
+X509_VERIFY_PARAM *SSL_CTX_get0_param(SSL_CTX *ctx)
+	{
+	return ctx->param;
+	}
+
+X509_VERIFY_PARAM *SSL_get0_param(SSL *ssl)
+	{
+	return ssl->param;
+	}
+
 void SSL_certs_clear(SSL *s)
 	{
 	ssl_cert_clear_certs(s->cert);