1 files changed, 144 insertions, 0 deletions
diff --git a/src/auth/userdb-static.c b/src/auth/userdb-static.c
new file mode 100644
index 0000000..bed0f58
--- /dev/null
+++ b/src/auth/userdb-static.c
@@ -0,0 +1,144 @@
+/* Copyright (c) 2003-2018 Dovecot authors, see the included COPYING file */
+
+#include "auth-common.h"
+
+#include "array.h"
+#include "str.h"
+#include "var-expand.h"
+#include "userdb.h"
+#include "userdb-template.h"
+
+
+struct static_context {
+	userdb_callback_t *callback, *old_callback;
+	void *old_context;
+};
+
+struct static_userdb_module {
+	struct userdb_module module;
+	struct userdb_template *tmpl;
+
+	bool allow_all_users:1;
+};
+
+static void static_lookup_real(struct auth_request *auth_request,
+			       userdb_callback_t *callback)
+{
+	struct userdb_module *_module = auth_request->userdb->userdb;
+	struct static_userdb_module *module =
+		(struct static_userdb_module *)_module;
+	const char *error;
+
+	if (userdb_template_export(module->tmpl, auth_request, &error) < 0) {
+		e_error(authdb_event(auth_request),
+			"Failed to expand template: %s", error);
+		callback(USERDB_RESULT_INTERNAL_FAILURE, auth_request);
+	}
+	callback(USERDB_RESULT_OK, auth_request);
+}
+
+static void
+static_credentials_callback(enum passdb_result result,
+			    const unsigned char *credentials ATTR_UNUSED,
+			    size_t size ATTR_UNUSED,
+			    struct auth_request *auth_request)
+{
+	struct static_context *ctx = auth_request->context;
+
+	auth_request->userdb_lookup = TRUE;
+
+	auth_request->private_callback.userdb = ctx->old_callback;
+	auth_request->context = ctx->old_context;
+	auth_request_set_state(auth_request, AUTH_REQUEST_STATE_USERDB);
+
+	switch (result) {
+	case PASSDB_RESULT_OK:
+		static_lookup_real(auth_request, ctx->callback);
+		break;
+	case PASSDB_RESULT_USER_UNKNOWN:
+	case PASSDB_RESULT_USER_DISABLED:
+	case PASSDB_RESULT_PASS_EXPIRED:
+		ctx->callback(USERDB_RESULT_USER_UNKNOWN, auth_request);
+		break;
+	case PASSDB_RESULT_SCHEME_NOT_AVAILABLE:
+		e_error(authdb_event(auth_request),
+			"passdb doesn't support lookups, "
+			"can't verify user's existence");
+		/* fall through */
+	default:
+		ctx->callback(USERDB_RESULT_INTERNAL_FAILURE, auth_request);
+		break;
+	}
+
+	i_free(ctx);
+}
+
+static void static_lookup(struct auth_request *auth_request,
+			  userdb_callback_t *callback)
+{
+	struct userdb_module *_module = auth_request->userdb->userdb;
+	struct static_userdb_module *module =
+		(struct static_userdb_module *)_module;
+	struct static_context *ctx;
+
+	if (!auth_request->fields.successful && !module->allow_all_users) {
+		/* this is a userdb-only lookup. we need to know if this
+		   users exists or not. use a passdb lookup to do that.
+		   if the passdb doesn't support returning credentials, this
+		   will of course fail.. */
+		ctx = i_new(struct static_context, 1);
+		ctx->old_callback = auth_request->private_callback.userdb;
+		ctx->old_context = auth_request->context;
+		ctx->callback = callback;
+
+		i_assert(auth_request->state == AUTH_REQUEST_STATE_USERDB);
+		auth_request_set_state(auth_request,
+				       AUTH_REQUEST_STATE_MECH_CONTINUE);
+
+		auth_request->context = ctx;
+		if (auth_request->passdb != NULL) {
+			/* kludge: temporarily work as if we weren't doing
+			   a userdb lookup. this is to get auth cache to use
+			   passdb caching instead of userdb caching. */
+			auth_request->userdb_lookup = FALSE;
+			auth_request_lookup_credentials(auth_request, "",
+				static_credentials_callback);
+		} else {
+			static_credentials_callback(
+				PASSDB_RESULT_SCHEME_NOT_AVAILABLE,
+				uchar_empty_ptr, 0, auth_request);
+		}
+	} else {
+		static_lookup_real(auth_request, callback);
+	}
+}
+
+static struct userdb_module *
+static_preinit(pool_t pool, const char *args)
+{
+	struct static_userdb_module *module;
+	const char *value;
+
+	module = p_new(pool, struct static_userdb_module, 1);
+	module->tmpl = userdb_template_build(pool, "static", args);
+
+	if (userdb_template_remove(module->tmpl, "allow_all_users", &value)) {
+		module->allow_all_users = value == NULL ||
+			strcasecmp(value, "yes") == 0;
+	}
+	return &module->module;
+}
+
+struct userdb_module_interface userdb_static = {
+	"static",
+
+	static_preinit,
+	NULL,
+	NULL,
+
+	static_lookup,
+
+	NULL,
+	NULL,
+	NULL
+};