http-backend: Use http.getanyfile to disable dumb HTTP serving

Some repository owners may wish to enable smart HTTP, but disallow
dumb content serving.  Disallowing dumb serving might be because
the owners want to rely upon reachability to control which objects
clients may access from the repository, or they just want to
encourage clients to use the more bandwidth efficient transport.

If http.getanyfile is set to false the backend CGI will return with
'403 Forbidden' when an object file is accessed by a dumb client.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 28 insertions, 6 deletions

diff --git a/http-backend.c b/http-backend.c
index 7900cda69a..902126675a 100644
--- a/http-backend.c
+++ b/http-backend.c
@@ -10,6 +10,7 @@
 static const char content_type[] = "Content-Type";
 static const char content_length[] = "Content-Length";
 static const char last_modified[] = "Last-Modified";
+static int getanyfile = 1;
 
 static struct string_list *query_params;
 
@@ -194,6 +195,12 @@ static NORETURN void forbidden(const char *err, ...)
 	exit(0);
 }
 
+static void select_getanyfile(void)
+{
+	if (!getanyfile)
+		forbidden("Unsupported service: getanyfile");
+}
+
 static void send_strbuf(const char *type, struct strbuf *buf)
 {
 	hdr_int(content_length, buf->len);
@@ -238,38 +245,51 @@ static void send_file(const char *the_type, const char *name)
 
 static void get_text_file(char *name)
 {
+	select_getanyfile();
 	hdr_nocache();
 	send_file("text/plain", name);
 }
 
 static void get_loose_object(char *name)
 {
+	select_getanyfile();
 	hdr_cache_forever();
 	send_file("application/x-git-loose-object", name);
 }
 
 static void get_pack_file(char *name)
 {
+	select_getanyfile();
 	hdr_cache_forever();
 	send_file("application/x-git-packed-objects", name);
 }
 
 static void get_idx_file(char *name)
 {
+	select_getanyfile();
 	hdr_cache_forever();
 	send_file("application/x-git-packed-objects-toc", name);
 }
 
 static int http_config(const char *var, const char *value, void *cb)
 {
-	struct rpc_service *svc = cb;
-
-	if (!prefixcmp(var, "http.") &&
-	    !strcmp(var + 5, svc->config_name)) {
-		svc->enabled = git_config_bool(var, value);
+	if (!strcmp(var, "http.getanyfile")) {
+		getanyfile = git_config_bool(var, value);
 		return 0;
 	}
 
+	if (!prefixcmp(var, "http.")) {
+		int i;
+
+		for (i = 0; i < ARRAY_SIZE(rpc_service); i++) {
+			struct rpc_service *svc = &rpc_service[i];
+			if (!strcmp(var + 5, svc->config_name)) {
+				svc->enabled = git_config_bool(var, value);
+				return 0;
+			}
+		}
+	}
+
 	/* we are not interested in parsing any other configuration here */
 	return 0;
 }
@@ -293,7 +313,6 @@ static struct rpc_service *select_service(const char *name)
 	if (!svc)
 		forbidden("Unsupported service: '%s'", name);
 
-	git_config(http_config, svc);
 	if (svc->enabled < 0) {
 		const char *user = getenv("REMOTE_USER");
 		svc->enabled = (user && *user) ? 1 : 0;
@@ -442,6 +461,7 @@ static void get_info_refs(char *arg)
 		run_service(argv);
 
 	} else {
+		select_getanyfile();
 		for_each_ref(show_text_ref, &buf);
 		send_strbuf("text/plain", &buf);
 	}
@@ -455,6 +475,7 @@ static void get_info_packs(char *arg)
 	struct packed_git *p;
 	size_t cnt = 0;
 
+	select_getanyfile();
 	prepare_packed_git();
 	for (p = packed_git; p; p = p->next) {
 		if (p->pack_local)
@@ -621,6 +642,7 @@ int main(int argc, char **argv)
 	if (!enter_repo(dir, 0))
 		not_found("Not a git repository: '%s'", dir);
 
+	git_config(http_config, NULL);
 	cmd->imp(cmd_arg);
 	return 0;
 }