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From eb5ffe2641febe0fa5e9038f2e216c130e1e7519 Mon Sep 17 00:00:00 2001
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From: Aki Tuomi <aki.tuomi@open-xchange.com>
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Date: Mon, 21 Jan 2019 11:36:30 +0200
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Subject: [PATCH] login-common: Ensure we get username from certificate
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---
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src/login-common/sasl-server.c | 42 ++++++++++++++++++++++++++++++++--
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1 file changed, 40 insertions(+), 2 deletions(-)
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diff --git a/src/login-common/sasl-server.c b/src/login-common/sasl-server.c
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index a833c9a6d4..9465da9657 100644
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--- a/src/login-common/sasl-server.c
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+++ b/src/login-common/sasl-server.c
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@@ -321,6 +321,37 @@ authenticate_callback(struct auth_client_request *request,
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}
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}
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+static bool get_cert_username(struct client *client, const char **username_r,
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+ const char **error_r)
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+{
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+ /* no SSL */
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+ if (client->ssl_proxy == NULL) {
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+ *username_r = NULL;
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+ return TRUE;
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+ }
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+
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+ /* no client certificate */
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+ if (!ssl_proxy_has_valid_client_cert(client->ssl_proxy)) {
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+ *username_r = NULL;
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+ return TRUE;
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+ }
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+
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+ /* get peer name */
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+ const char *username = ssl_proxy_get_peer_name(client->ssl_proxy);
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+
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+ /* if we wanted peer name, but it was not there, fail */
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+ if (client->set->auth_ssl_username_from_cert &&
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+ (username == NULL || *username == '\0')) {
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+ if (client->set->auth_ssl_require_client_cert) {
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+ *error_r = "Missing username in certificate";
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+ return FALSE;
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+ }
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+ }
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+
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+ *username_r = username;
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+ return TRUE;
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+}
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+
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void sasl_server_auth_begin(struct client *client,
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const char *service, const char *mech_name,
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const char *initial_resp_base64,
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@@ -359,8 +390,15 @@ void sasl_server_auth_begin(struct client *client,
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info.mech = mech->name;
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info.service = service;
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info.session_id = client_get_session_id(client);
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- info.cert_username = client->ssl_proxy == NULL ? NULL :
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- ssl_proxy_get_peer_name(client->ssl_proxy);
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+ if (client->set->auth_ssl_username_from_cert) {
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+ const char *error;
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+ if (!get_cert_username(client, &info.cert_username, &error)) {
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+ client_log_err(client, t_strdup_printf("Cannot get username "
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+ "from certificate: %s", error));
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+ sasl_server_auth_failed(client, "Unable to validate certificate");
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+ return;
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+ }
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+ }
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info.flags = client_get_auth_flags(client);
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info.local_ip = client->local_ip;
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info.remote_ip = client->ip;
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