+++ /dev/null
-/*
- * This file is part of DisOrder.
- * Copyright (C) 2008 Richard Kettlewell
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful, but
- * WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
- * USA
- */
-
-#include "disorder-cgi.h"
-
-/** @brief Client used by CGI
- *
- * The caller should arrange for this to be created before any of
- * these expansions are used (if it cannot connect then it's safe to
- * leave it as NULL).
- */
-disorder_client *dcgi_client;
-
-/** @brief Return true if @p a is better than @p b
- *
- * NB. We don't bother checking if the path is right, we merely check for the
- * longest path. This isn't a security hole: if the browser wants to send us
- * bad cookies it's quite capable of sending just the right path anyway. The
- * point of choosing the longest path is to avoid using a cookie set by another
- * CGI script which shares a path prefix with us, which would allow it to
- * maliciously log users out.
- *
- * Such a script could still "maliciously" log someone in, if it had acquired a
- * suitable cookie. But it could just log in directly if it had that, so there
- * is no obvious vulnerability here either.
- */
-static int better_cookie(const struct cookie *a, const struct cookie *b) {
- if(a->path && b->path)
- /* If both have a path then the one with the longest path is best */
- return strlen(a->path) > strlen(b->path);
- else if(a->path)
- /* If only @p a has a path then it is better */
- return 1;
- else
- /* If neither have a path, or if only @p b has a path, then @p b is
- * better */
- return 0;
-}
-
-/** @brief Login cookie */
-char *dcgi_cookie;
-
-/** @brief Set @ref login_cookie */
-void dcgi_get_cookie(void) {
- const char *cookie_env;
- int n, best_cookie;
- struct cookiedata cd;
-
- /* See if there's a cookie */
- cookie_env = getenv("HTTP_COOKIE");
- if(cookie_env) {
- /* This will be an HTTP header */
- if(!parse_cookie(cookie_env, &cd)) {
- /* Pick the best available cookie from all those offered */
- best_cookie = -1;
- for(n = 0; n < cd.ncookies; ++n) {
- /* Is this the right cookie? */
- if(strcmp(cd.cookies[n].name, "disorder"))
- continue;
- /* Is it better than anything we've seen so far? */
- if(best_cookie < 0
- || better_cookie(&cd.cookies[n], &cd.cookies[best_cookie]))
- best_cookie = n;
- }
- if(best_cookie != -1)
- dcgi_cookie = cd.cookies[best_cookie].value;
- } else
- error(0, "could not parse cookie field '%s'", cookie_env);
- }
-}
-
-/** @brief Return a Cookie: header */
-char *dcgi_cookie_header(void) {
- struct dynstr d[1];
- struct url u;
- char *s;
-
- memset(&u, 0, sizeof u);
- dynstr_init(d);
- parse_url(config->url, &u);
- if(dcgi_cookie) {
- dynstr_append_string(d, "disorder=");
- dynstr_append_string(d, dcgi_cookie);
- } else {
- /* Force browser to discard cookie */
- dynstr_append_string(d, "disorder=none;Max-Age=0");
- }
- if(u.path) {
- /* The default domain matches the request host, so we need not override
- * that. But the default path only goes up to the rightmost /, which would
- * cause the browser to expose the cookie to other CGI programs on the same
- * web server. */
- dynstr_append_string(d, ";Version=1;Path=");
- /* Formally we are supposed to quote the path, since it invariably has a
- * slash in it. However Safari does not parse quoted paths correctly, so
- * this won't work. Fortunately nothing else seems to care about proper
- * quoting of paths, so in practice we get with it. (See also
- * parse_cookie() where we are liberal about cookie paths on the way back
- * in.) */
- dynstr_append_string(d, u.path);
- }
- dynstr_terminate(d);
- byte_xasprintf(&s, "Set-Cookie: %s", d->vec);
- return s;
-}
-
-/** @brief Log in as the current user or guest if none */
-void dcgi_login(void) {
- /* Junk old data */
- dcgi_lookup_reset();
- /* Junk the old connection if there is one */
- if(dcgi_client)
- disorder_close(dcgi_client);
- /* Create a new connection */
- dcgi_client = disorder_new(0);
- /* Reconnect */
- if(disorder_connect_cookie(dcgi_client, dcgi_cookie)) {
- dcgi_error("connect");
- exit(0);
- }
- /* If there was a cookie but it went bad, we forget it */
- if(dcgi_cookie && !strcmp(disorder_user(dcgi_client), "guest"))
- dcgi_cookie = 0;
-}
-
-/*
-Local Variables:
-c-basic-offset:2
-comment-column:40
-fill-column:79
-indent-tabs-mode:nil
-End:
-*/
~mdw / disorder / blobdiff