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From 0486590c2944b39b480ab1713026ea402420863e Mon Sep 17 00:00:00 2001
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From: Jakub Hrozek <jhrozek@redhat.com>
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Date: Mon, 16 Mar 2020 21:09:37 +0100
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Subject: [PATCH 4/6] Backport of improve validation of the post-logout URL;
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closes #449
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---
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src/mod_auth_openidc.c | 90 +++++++++++++++++++++++++-----------------
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1 file changed, 53 insertions(+), 37 deletions(-)
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diff --git a/src/mod_auth_openidc.c b/src/mod_auth_openidc.c
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index b504ecbf62f839a82ad205fa5f825f9a8428dfdb..431e89e086fbb72f56ea2a212e63c6ac693f62a2 100644
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--- a/src/mod_auth_openidc.c
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+++ b/src/mod_auth_openidc.c
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@@ -2083,6 +2083,52 @@ static int oidc_handle_logout_request(request_rec *r, oidc_cfg *c,
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return HTTP_MOVED_TEMPORARILY;
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}
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+static apr_byte_t oidc_validate_post_logout_url(request_rec *r, const char *url, char **err_str, char **err_desc) {
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+ apr_uri_t uri;
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+ const char *c_host = NULL;
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+
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+ if (apr_uri_parse(r->pool, url, &uri) != APR_SUCCESS) {
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+ *err_str = apr_pstrdup(r->pool, "Malformed URL");
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+ *err_desc = apr_psprintf(r->pool, "Logout URL malformed: %s", url);
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+ oidc_error(r, "%s: %s", *err_str, *err_desc);
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+ return FALSE;
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+ }
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+
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+ c_host = oidc_get_current_url_host(r);
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+ if ((uri.hostname != NULL)
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+ && ((strstr(c_host, uri.hostname) == NULL)
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+ || (strstr(uri.hostname, c_host) == NULL))) {
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+ *err_str = apr_pstrdup(r->pool, "Invalid Request");
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+ *err_desc =
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+ apr_psprintf(r->pool,
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+ "logout value \"%s\" does not match the hostname of the current request \"%s\"",
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+ apr_uri_unparse(r->pool, &uri, 0), c_host);
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+ oidc_error(r, "%s: %s", *err_str, *err_desc);
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+ return FALSE;
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+ } else if (strstr(url, "/") != url) {
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+ *err_str = apr_pstrdup(r->pool, "Malformed URL");
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+ *err_desc =
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+ apr_psprintf(r->pool,
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+ "No hostname was parsed and it does not seem to be relative, i.e starting with '/': %s",
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+ url);
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+ oidc_error(r, "%s: %s", *err_str, *err_desc);
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+ return FALSE;
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+ }
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+
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+ /* validate the URL to prevent HTTP header splitting */
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+ if (((strstr(url, "\n") != NULL) || strstr(url, "\r") != NULL)) {
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+ *err_str = apr_pstrdup(r->pool, "Invalid Request");
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+ *err_desc =
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+ apr_psprintf(r->pool,
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+ "logout value \"%s\" contains illegal \"\n\" or \"\r\" character(s)",
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+ url);
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+ oidc_error(r, "%s: %s", *err_str, *err_desc);
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+ return FALSE;
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+ }
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+
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+ return TRUE;
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+}
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+
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/*
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* perform (single) logout
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*/
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@@ -2090,6 +2136,8 @@ static int oidc_handle_logout(request_rec *r, oidc_cfg *c, session_rec *session)
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/* pickup the command or URL where the user wants to go after logout */
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char *url = NULL;
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+ char *error_str = NULL;
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+ char *error_description = NULL;
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oidc_util_get_request_parameter(r, "logout", &url;;
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oidc_debug(r, "enter (url=%s)", url);
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@@ -2103,44 +2151,12 @@ static int oidc_handle_logout(request_rec *r, oidc_cfg *c, session_rec *session)
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url = c->default_slo_url;
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} else {
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-
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/* do input validation on the logout parameter value */
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-
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- const char *error_description = NULL;
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- apr_uri_t uri;
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-
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- if (apr_uri_parse(r->pool, url, &uri) != APR_SUCCESS) {
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- const char *error_description = apr_psprintf(r->pool,
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- "Logout URL malformed: %s", url);
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- oidc_error(r, "%s", error_description);
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- return oidc_util_html_send_error(r, c->error_template,
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- "Malformed URL", error_description,
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- HTTP_INTERNAL_SERVER_ERROR);
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-
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- }
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-
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- if ((strstr(r->hostname, uri.hostname) == NULL)
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- || (strstr(uri.hostname, r->hostname) == NULL)) {
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- error_description =
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- apr_psprintf(r->pool,
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- "logout value \"%s\" does not match the hostname of the current request \"%s\"",
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- apr_uri_unparse(r->pool, &uri, 0), r->hostname);
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- oidc_error(r, "%s", error_description);
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- return oidc_util_html_send_error(r, c->error_template,
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- "Invalid Request", error_description,
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- HTTP_INTERNAL_SERVER_ERROR);
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- }
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-
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- /* validate the URL to prevent HTTP header splitting */
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- if (((strstr(url, "\n") != NULL) || strstr(url, "\r") != NULL)) {
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- error_description =
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- apr_psprintf(r->pool,
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- "logout value \"%s\" contains illegal \"\n\" or \"\r\" character(s)",
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- url);
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- oidc_error(r, "%s", error_description);
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- return oidc_util_html_send_error(r, c->error_template,
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- "Invalid Request", error_description,
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- HTTP_INTERNAL_SERVER_ERROR);
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+ if (oidc_validate_post_logout_url(r, url, &error_str,
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+ &error_description) == FALSE) {
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+ return oidc_util_html_send_error(r, c->error_template, error_str,
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+ error_description,
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+ HTTP_BAD_REQUEST);
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}
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}
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--
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2.21.1
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