1 files changed, 70 insertions, 0 deletions
diff --git a/src/lib-sasl/mech-plain.c b/src/lib-sasl/mech-plain.c
new file mode 100644
index 0000000..432fa1f
--- /dev/null
+++ b/src/lib-sasl/mech-plain.c
@@ -0,0 +1,70 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "str.h"
+#include "dsasl-client-private.h"
+
+struct plain_dsasl_client {
+	struct dsasl_client client;
+	bool output_sent;
+};
+
+static int
+mech_plain_input(struct dsasl_client *_client,
+		 const unsigned char *input ATTR_UNUSED, size_t input_len,
+		 const char **error_r)
+{
+	struct plain_dsasl_client *client =
+		(struct plain_dsasl_client *)_client;
+
+	if (!client->output_sent) {
+		if (input_len > 0) {
+			*error_r = "Server sent non-empty initial response";
+			return -1;
+		}
+	} else {
+		*error_r = "Server didn't finish authentication";
+		return -1;
+	}
+	return 0;
+}
+
+static int
+mech_plain_output(struct dsasl_client *_client,
+		  const unsigned char **output_r, size_t *output_len_r,
+		  const char **error_r)
+{
+	struct plain_dsasl_client *client =
+		(struct plain_dsasl_client *)_client;
+	string_t *str;
+
+	if (_client->set.authid == NULL) {
+		*error_r = "authid not set";
+		return -1;
+	}
+	if (_client->password == NULL) {
+		*error_r = "password not set";
+		return -1;
+	}
+
+	str = str_new(_client->pool, 64);
+	if (_client->set.authzid != NULL)
+		str_append(str, _client->set.authzid);
+	str_append_c(str, '\0');
+	str_append(str, _client->set.authid);
+	str_append_c(str, '\0');
+	str_append(str, _client->password);
+
+	*output_r = str_data(str);
+	*output_len_r = str_len(str);
+	client->output_sent = TRUE;
+	return 0;
+}
+
+const struct dsasl_client_mech dsasl_client_mech_plain = {
+	.name = "PLAIN",
+	.struct_size = sizeof(struct plain_dsasl_client),
+
+	.input = mech_plain_input,
+	.output = mech_plain_output
+};