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SUSE:SLE-15-SP3:GA
apache2-mod_auth_openidc.28532
fix-CVE-2021-39191.patch
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File fix-CVE-2021-39191.patch of Package apache2-mod_auth_openidc.28532
From 03e6bfb446f4e3f27c003d30d6a433e5dd8e2b3d Mon Sep 17 00:00:00 2001 From: Hans Zandbelt <hans.zandbelt@zmartzone.eu> Date: Fri, 3 Sep 2021 10:41:21 +0200 Subject: [PATCH] apply OIDCRedirectURLsAllowed setting to target_link_uri closes #672; thanks @Meheni release 2.4.9.4 Signed-off-by: Hans Zandbelt <hans.zandbelt@zmartzone.eu> --- AUTHORS | 2 + ChangeLog | 2 + auth_openidc.conf | 5 +- configure.ac | 2 +- src/mod_auth_openidc.c | 191 ++++++++++++++++++++++------------------- 5 files changed, 109 insertions(+), 93 deletions(-) Index: mod_auth_openidc-2.3.8/src/mod_auth_openidc.c =================================================================== --- mod_auth_openidc-2.3.8.orig/src/mod_auth_openidc.c +++ mod_auth_openidc-2.3.8/src/mod_auth_openidc.c @@ -2411,6 +2411,79 @@ static int oidc_target_link_uri_matches_ return TRUE; } +#define OIDC_MAX_URL_LENGTH 8192 * 2 + +static apr_byte_t oidc_validate_redirect_url(request_rec *r, oidc_cfg *c, + const char *redirect_to_url, apr_byte_t restrict_to_host, char **err_str, + char **err_desc) { + apr_uri_t uri; + const char *c_host = NULL; + apr_hash_index_t *hi = NULL; + size_t i = 0; + char *url = apr_pstrndup(r->pool, redirect_to_url, OIDC_MAX_URL_LENGTH); + + // replace potentially harmful backslashes with forward slashes + for (i = 0; i < strlen(url); i++) + if (url[i] == '\\') + url[i] = '/'; + + if (apr_uri_parse(r->pool, url, &uri) != APR_SUCCESS) { + *err_str = apr_pstrdup(r->pool, "Malformed URL"); + *err_desc = apr_psprintf(r->pool, "not a valid URL value: %s", url); + oidc_error(r, "%s: %s", *err_str, *err_desc); + return FALSE; + } + + if ((uri.hostname != NULL) && (restrict_to_host == TRUE)) { + c_host = oidc_get_current_url_host(r); + if ((strstr(c_host, uri.hostname) == NULL) + || (strstr(uri.hostname, c_host) == NULL)) { + *err_str = apr_pstrdup(r->pool, "Invalid Request"); + *err_desc = + apr_psprintf(r->pool, + "URL value \"%s\" does not match the hostname of the current request \"%s\"", + apr_uri_unparse(r->pool, &uri, 0), c_host); + oidc_error(r, "%s: %s", *err_str, *err_desc); + return FALSE; + } + } + + if ((uri.hostname == NULL) && (strstr(url, "/") != url)) { + *err_str = apr_pstrdup(r->pool, "Malformed URL"); + *err_desc = + apr_psprintf(r->pool, + "No hostname was parsed and it does not seem to be relative, i.e starting with '/': %s", + url); + oidc_error(r, "%s: %s", *err_str, *err_desc); + return FALSE; + } else if ((uri.hostname == NULL) && (strstr(url, "//") == url)) { + *err_str = apr_pstrdup(r->pool, "Malformed URL"); + *err_desc = apr_psprintf(r->pool, + "No hostname was parsed and starting with '//': %s", url); + oidc_error(r, "%s: %s", *err_str, *err_desc); + return FALSE; + } else if ((uri.hostname == NULL) && (strstr(url, "/\\") == url)) { + *err_str = apr_pstrdup(r->pool, "Malformed URL"); + *err_desc = apr_psprintf(r->pool, + "No hostname was parsed and starting with '/\\': %s", url); + oidc_error(r, "%s: %s", *err_str, *err_desc); + return FALSE; + } + + /* validate the URL to prevent HTTP header splitting */ + if (((strstr(url, "\n") != NULL) || strstr(url, "\r") != NULL)) { + *err_str = apr_pstrdup(r->pool, "Invalid URL"); + *err_desc = + apr_psprintf(r->pool, + "URL value \"%s\" contains illegal \"\n\" or \"\r\" character(s)", + url); + oidc_error(r, "%s: %s", *err_str, *err_desc); + return FALSE; + } + + return TRUE; +} + /* * handle a response from an IDP discovery page and/or handle 3rd-party initiated SSO */ @@ -2421,6 +2494,8 @@ static int oidc_handle_discovery_respons *auth_request_params = NULL, *csrf_cookie, *csrf_query = NULL, *user = NULL, *path_scopes; oidc_provider_t *provider = NULL; + char *error_str = NULL; + char *error_description = NULL; oidc_util_get_request_parameter(r, OIDC_DISC_OP_PARAM, &issuer); oidc_util_get_request_parameter(r, OIDC_DISC_USER_PARAM, &user); @@ -2463,7 +2538,7 @@ static int oidc_handle_discovery_respons target_link_uri = c->default_sso_url; } - /* do open redirect prevention */ + /* do open redirect prevention, step 1 */ if (oidc_target_link_uri_matches_configuration(r, c, target_link_uri) == FALSE) { return oidc_util_html_send_error(r, c->error_template, @@ -2472,6 +2547,14 @@ static int oidc_handle_discovery_respons HTTP_UNAUTHORIZED); } + /* do input validation on the target_link_uri parameter value, step 2 */ + if (oidc_validate_redirect_url(r, c, target_link_uri, TRUE, &error_str, + &error_description) == FALSE) { + return oidc_util_html_send_error(r, c->error_template, error_str, + error_description, + HTTP_UNAUTHORIZED); + } + /* see if this is a static setup */ if (c->metadata_dir == NULL) { if ((oidc_provider_static_config(r, c, &provider) == TRUE) @@ -2618,79 +2701,6 @@ static int oidc_handle_logout_request(re return HTTP_MOVED_TEMPORARILY; } -#define OIDC_MAX_URL_LENGTH 8192 * 2 - -static apr_byte_t oidc_validate_post_logout_url(request_rec *r, - const char *redirect_to_url, char **err_str, char **err_desc) { - apr_uri_t uri; - const char *c_host = NULL; - size_t i = 0; - char *url = apr_pstrndup(r->pool, redirect_to_url, OIDC_MAX_URL_LENGTH); - - // replace potentially harmful backslashes with forward slashes - for (i = 0; i < strlen(url); i++) - if (url[i] == '\\') - url[i] = '/'; - - if (apr_uri_parse(r->pool, url, &uri) != APR_SUCCESS) { - *err_str = apr_pstrdup(r->pool, "Malformed URL"); - *err_desc = apr_psprintf(r->pool, "Logout URL malformed: %s", url); - oidc_error(r, "%s: %s", *err_str, *err_desc); - return FALSE; - } - - c_host = oidc_get_current_url_host(r); - if ((uri.hostname != NULL) - && ((strstr(c_host, uri.hostname) == NULL) - || (strstr(uri.hostname, c_host) == NULL))) { - *err_str = apr_pstrdup(r->pool, "Invalid Request"); - *err_desc = - apr_psprintf(r->pool, - "logout value \"%s\" does not match the hostname of the current request \"%s\"", - apr_uri_unparse(r->pool, &uri, 0), c_host); - oidc_error(r, "%s: %s", *err_str, *err_desc); - return FALSE; - } else if ((uri.hostname == NULL) && (strstr(url, "/") != url)) { - *err_str = apr_pstrdup(r->pool, "Malformed URL"); - *err_desc = - apr_psprintf(r->pool, - "No hostname was parsed and it does not seem to be relative, i.e starting with '/': %s", - url); - oidc_error(r, "%s: %s", *err_str, *err_desc); - return FALSE; - } else if ((uri.hostname == NULL) && (strstr(url, "//") == url)) { - *err_str = apr_pstrdup(r->pool, "Malformed URL"); - *err_desc = - apr_psprintf(r->pool, - "No hostname was parsed and starting with '//': %s", - url); - oidc_error(r, "%s: %s", *err_str, *err_desc); - return FALSE; - } else if ((uri.hostname == NULL) && (strstr(url, "/\\") == url)) { - *err_str = apr_pstrdup(r->pool, "Malformed URL"); - *err_desc = - apr_psprintf(r->pool, - "No hostname was parsed and starting with '/\\': %s", - url); - oidc_error(r, "%s: %s", *err_str, *err_desc); - return FALSE; - } - - /* validate the URL to prevent HTTP header splitting */ - if (((strstr(url, "\n") != NULL) || strstr(url, "\r") != NULL)) { - *err_str = apr_pstrdup(r->pool, "Invalid Request"); - *err_desc = - apr_psprintf(r->pool, - "logout value \"%s\" contains illegal \"\n\" or \"\r\" character(s)", - url); - oidc_error(r, "%s: %s", *err_str, *err_desc); - return FALSE; - } - - return TRUE; -} - - /* * perform (single) logout */ @@ -2717,7 +2727,7 @@ static int oidc_handle_logout(request_re } else { /* do input validation on the logout parameter value */ - if (oidc_validate_post_logout_url(r, url, &error_str, + if (oidc_validate_redirect_url(r, c, url, TRUE, &error_str, &error_description) == FALSE) { return oidc_util_html_send_error(r, c->error_template, error_str, error_description,
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