openssl: use ASN1_STRING_get0_data when compiling against 1.1

For older versions we can fall back on the deprecated ASN1_STRING_data.

Author: carlosmn

src/openssl_stream.c

@@ -357,7 +357,7 @@ static int verify_server_cert(SSL *ssl, const char *host)
 		num = sk_GENERAL_NAME_num(alts);
 		for (i = 0; i < num && matched != 1; i++) {
 			const GENERAL_NAME *gn = sk_GENERAL_NAME_value(alts, i);
-			const char *name = (char *) ASN1_STRING_data(gn->d.ia5);
+			const char *name = (char *) ASN1_STRING_get0_data(gn->d.ia5);
 			size_t namelen = (size_t) ASN1_STRING_length(gn->d.ia5);
 
 			/* Skip any names of a type we're not looking for */
@@ -412,7 +412,7 @@ static int verify_server_cert(SSL *ssl, const char *host)
 		if (size > 0) {
 			peer_cn = OPENSSL_malloc(size + 1);
 			GITERR_CHECK_ALLOC(peer_cn);
-			memcpy(peer_cn, ASN1_STRING_data(str), size);
+			memcpy(peer_cn, ASN1_STRING_get0_data(str), size);
 			peer_cn[size] = '\0';
 		} else {
 			goto cert_fail_name;

src/openssl_stream.h

@@ -108,6 +108,11 @@ GIT_INLINE(void*) BIO_get_data(BIO *a)
 	return a->ptr;
 }
 
+GIT_INLINE(const unsigned char *) ASN1_STRING_get0_data(const ASN1_STRING *x)
+{
+	return ASN1_STRING_data((ASN1_STRING *)x);
+}
+
 # endif
 
 #endif