2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2005, 2007, 2008 Richard Kettlewell
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
27 #include <sys/types.h>
28 #include <sys/socket.h>
38 #include "configuration.h"
40 #include "api-client.h"
46 /** @brief Return true if @p a is better than @p b
48 * NB. We don't bother checking if the path is right, we merely check for the
49 * longest path. This isn't a security hole: if the browser wants to send us
50 * bad cookies it's quite capable of sending just the right path anyway. The
51 * point of choosing the longest path is to avoid using a cookie set by another
52 * CGI script which shares a path prefix with us, which would allow it to
53 * maliciously log users out.
55 * Such a script could still "maliciously" log someone in, if it had acquired a
56 * suitable cookie. But it could just log in directly if it had that, so there
57 * is no obvious vulnerability here either.
59 static int better_cookie(const struct cookie *a, const struct cookie *b) {
60 if(a->path && b->path)
61 /* If both have a path then the one with the longest path is best */
62 return strlen(a->path) > strlen(b->path);
64 /* If only @p a has a path then it is better */
67 /* If neither have a path, or if only @p b has a path, then @p b is
72 int main(int argc, char **argv) {
73 const char *cookie_env, *conf;
80 if(argc > 0) progname = argv[0];
81 /* RFC 3875 s8.2 recommends rejecting PATH_INFO if we don't make use of
83 if(getenv("PATH_INFO")) {
84 printf("Content-Type: text/html\n");
85 printf("Status: 404\n");
87 printf("<p>Sorry, PATH_INFO not supported.</p>\n");
91 if((conf = getenv("DISORDER_CONFIG"))) configfile = xstrdup(conf);
92 if(getenv("DISORDER_DEBUG")) debugging = 1;
93 if(config_read(0)) exit(EXIT_FAILURE);
95 config->url = infer_url();
96 memset(&g, 0, sizeof g);
97 memset(&s, 0, sizeof s);
99 g.client = disorder_get_client();
101 output.sink = sink_stdio("stdout", stdout);
102 /* See if there's a cookie */
103 cookie_env = getenv("HTTP_COOKIE");
105 /* This will be an HTTP header */
106 if(!parse_cookie(cookie_env, &cd)) {
107 /* Pick the best available cookie from all those offered */
109 for(n = 0; n < cd.ncookies; ++n) {
110 /* Is this the right cookie? */
111 if(strcmp(cd.cookies[n].name, "disorder"))
113 /* Is it better than anything we've seen so far? */
115 || better_cookie(&cd.cookies[n], &cd.cookies[best_cookie]))
118 if(best_cookie != -1)
119 login_cookie = cd.cookies[best_cookie].value;
121 error(0, "could not parse cookie field '%s'", cookie_env);
123 disorder_cgi_login(&s, &output);
124 disorder_cgi(&output, &s);
125 if(fclose(stdout) < 0) fatal(errno, "error closing stdout");