1 files changed, 64 insertions, 0 deletions
diff --git a/src/auth/mech-external.c b/src/auth/mech-external.c
new file mode 100644
index 0000000..39809b4
--- /dev/null
+++ b/src/auth/mech-external.c
@@ -0,0 +1,64 @@
+/* Copyright (c) 2009-2018 Dovecot authors, see the included COPYING file */
+
+#include "auth-common.h"
+#include "passdb.h"
+#include "mech.h"
+#include "mech-plain-common.h"
+
+static void
+mech_external_auth_continue(struct auth_request *request,
+			    const unsigned char *data, size_t data_size)
+{
+	const char *authzid, *error;
+
+	authzid = t_strndup(data, data_size);
+	if (request->fields.user == NULL) {
+		e_info(request->mech_event,
+		       "username not known");
+		auth_request_fail(request);
+		return;
+	}
+
+	/* this call is done simply to put the username through translation
+	   settings */
+	if (!auth_request_set_username(request, "", &error)) {
+		e_info(request->mech_event,
+		       "Invalid username");
+		auth_request_fail(request);
+		return;
+	}
+
+	if (*authzid != '\0' &&
+	    !auth_request_set_login_username(request, authzid, &error)) {
+		/* invalid login username */
+		e_info(request->mech_event,
+		       "login user: %s", error);
+		auth_request_fail(request);
+	} else {
+                auth_request_verify_plain(request, "",
+                                          plain_verify_callback);
+	}
+}
+
+static struct auth_request *mech_external_auth_new(void)
+{
+        struct auth_request *request;
+	pool_t pool;
+
+	pool = pool_alloconly_create(MEMPOOL_GROWING"external_auth_request", 2048);
+	request = p_new(pool, struct auth_request, 1);
+	request->pool = pool;
+	return request;
+}
+
+const struct mech_module mech_external = {
+	"EXTERNAL",
+
+	.flags = 0,
+	.passdb_need = MECH_PASSDB_NEED_VERIFY_PLAIN,
+
+	mech_external_auth_new,
+	mech_generic_auth_initial,
+	mech_external_auth_continue,
+	mech_generic_auth_free
+};