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From 466f470265554e0e3ae27a6d82375456d2c133e6 Mon Sep 17 00:00:00 2001
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From: Hans Zandbelt <hans.zandbelt@zmartzone.eu>
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Date: Thu, 22 Jul 2021 15:32:12 +0200
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Subject: [PATCH 3/4] replace potentially harmful backslashes with forward
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slashes when validating redirection URLs
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(cherry picked from commit 69cb206225c749b51db980d44dc268eee5623f2b)
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---
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src/mod_auth_openidc.c | 12 +++++++++++-
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1 file changed, 11 insertions(+), 1 deletion(-)
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diff --git a/src/mod_auth_openidc.c b/src/mod_auth_openidc.c
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index 68fbca5..c96af75 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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@@ -2687,12 +2687,22 @@ 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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+
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+#define OIDC_MAX_URL_LENGTH DEFAULT_LIMIT_REQUEST_LINE * 2
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+
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static apr_byte_t oidc_validate_redirect_url(request_rec *r, oidc_cfg *c,
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- const char *url, apr_byte_t restrict_to_host, char **err_str,
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+ const char *redirect_to_url, apr_byte_t restrict_to_host, char **err_str,
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char **err_desc) {
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apr_uri_t uri;
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const char *c_host = NULL;
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apr_hash_index_t *hi = NULL;
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+ size_t i = 0;
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+ char *url = apr_pstrndup(r->pool, redirect_to_url, OIDC_MAX_URL_LENGTH);
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+
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+ // replace potentially harmful backslashes with forward slashes
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+ for (i = 0; i < strlen(url); i++)
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+ if (url[i] == '\\')
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+ url[i] = '/';
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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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--
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2.31.1
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