for-each-ref: report broken references correctly

diff --git a/send-pack.c b/send-pack.c
index 25947d7df9dd3af6e665d5d5eb63ec970617aef1..677bac31930298a7cc4c0087aef8b62fb10249f2 100644 (file)
--- a/send-pack.c
+++ b/send-pack.c
@@ -281,6 +281,28 @@ static int generate_push_cert(struct strbuf *req_buf,
        return update_seen;
 }
 
+#define NONCE_LEN_LIMIT 256
+
+static void reject_invalid_nonce(const char *nonce, int len)
+{
+       int i = 0;
+
+       if (NONCE_LEN_LIMIT <= len)
+               die("the receiving end asked to sign an invalid nonce <%.*s>",
+                   len, nonce);
+
+       for (i = 0; i < len; i++) {
+               int ch = nonce[i] & 0xFF;
+               if (isalnum(ch) ||
+                   ch == '-' || ch == '.' ||
+                   ch == '/' || ch == '+' ||
+                   ch == '=' || ch == '_')
+                       continue;
+               die("the receiving end asked to sign an invalid nonce <%.*s>",
+                   len, nonce);
+       }
+}
+
 int send_pack(struct send_pack_args *args,
              int fd[], struct child_process *conn,
              struct ref *remote_refs,
@@ -323,6 +345,7 @@ int send_pack(struct send_pack_args *args,
                push_cert_nonce = server_feature_value("push-cert", &len);
                if (!push_cert_nonce)
                        die(_("the receiving end does not support --signed push"));
+               reject_invalid_nonce(push_cert_nonce, len);
                push_cert_nonce = xmemdupz(push_cert_nonce, len);
        }