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1 | /* |
2 | * This file is part of DisOrder. |
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3 | * Copyright (C) 2004, 2005, 2007, 2008 Richard Kettlewell |
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4 | * |
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. |
9 | * |
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. |
14 | * |
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 |
18 | * USA |
19 | */ |
20 | |
21 | #include <config.h> |
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22 | #include "types.h" |
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23 | |
24 | #include <stdio.h> |
25 | #include <errno.h> |
26 | #include <stdlib.h> |
27 | #include <sys/types.h> |
28 | #include <sys/socket.h> |
29 | #include <locale.h> |
30 | #include <string.h> |
31 | #include <stdarg.h> |
32 | |
33 | #include "client.h" |
34 | #include "sink.h" |
35 | #include "cgi.h" |
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36 | #include "mem.h" |
37 | #include "log.h" |
38 | #include "configuration.h" |
39 | #include "disorder.h" |
40 | #include "api-client.h" |
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41 | #include "mime.h" |
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42 | #include "printf.h" |
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43 | #include "dcgi.h" |
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44 | #include "url.h" |
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45 | |
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46 | /** @brief Return true if @p a is better than @p b |
47 | * |
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. |
54 | * |
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. |
58 | */ |
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); |
63 | else if(a->path) |
64 | /* If only @p a has a path then it is better */ |
65 | return 1; |
66 | else |
67 | /* If neither have a path, or if only @p b has a path, then @p b is |
68 | * better */ |
69 | return 0; |
70 | } |
71 | |
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72 | int main(int argc, char **argv) { |
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73 | const char *cookie_env, *conf; |
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74 | dcgi_global g; |
75 | dcgi_state s; |
76 | cgi_sink output; |
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77 | int n, best_cookie; |
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78 | struct cookiedata cd; |
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79 | |
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80 | if(argc > 0) progname = argv[0]; |
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81 | /* RFC 3875 s8.2 recommends rejecting PATH_INFO if we don't make use of |
82 | * it. */ |
83 | if(getenv("PATH_INFO")) { |
84 | printf("Content-Type: text/html\n"); |
85 | printf("Status: 404\n"); |
86 | printf("\n"); |
87 | printf("<p>Sorry, PATH_INFO not supported.</p>\n"); |
88 | exit(0); |
89 | } |
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90 | cgi_parse(); |
91 | if((conf = getenv("DISORDER_CONFIG"))) configfile = xstrdup(conf); |
92 | if(getenv("DISORDER_DEBUG")) debugging = 1; |
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93 | if(config_read(0)) exit(EXIT_FAILURE); |
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94 | if(!config->url) |
95 | config->url = infer_url(); |
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96 | memset(&g, 0, sizeof g); |
97 | memset(&s, 0, sizeof s); |
98 | s.g = &g; |
99 | g.client = disorder_get_client(); |
100 | output.quote = 1; |
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101 | output.sink = sink_stdio("stdout", stdout); |
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102 | /* See if there's a cookie */ |
103 | cookie_env = getenv("HTTP_COOKIE"); |
104 | if(cookie_env) { |
105 | /* This will be an HTTP header */ |
106 | if(!parse_cookie(cookie_env, &cd)) { |
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107 | /* Pick the best available cookie from all those offered */ |
108 | best_cookie = -1; |
109 | for(n = 0; n < cd.ncookies; ++n) { |
110 | /* Is this the right cookie? */ |
111 | if(strcmp(cd.cookies[n].name, "disorder")) |
112 | continue; |
113 | /* Is it better than anything we've seen so far? */ |
114 | if(best_cookie < 0 |
115 | || better_cookie(&cd.cookies[n], &cd.cookies[best_cookie])) |
116 | best_cookie = n; |
117 | } |
118 | if(best_cookie != -1) |
119 | login_cookie = cd.cookies[best_cookie].value; |
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120 | } else |
121 | error(0, "could not parse cookie field '%s'", cookie_env); |
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122 | } |
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123 | disorder_cgi_login(&s, &output); |
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124 | disorder_cgi(&output, &s); |
125 | if(fclose(stdout) < 0) fatal(errno, "error closing stdout"); |
126 | return 0; |
127 | } |
128 | |
129 | /* |
130 | Local Variables: |
131 | c-basic-offset:2 |
132 | comment-column:40 |
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133 | fill-column:79 |
134 | indent-tabs-mode:nil |
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135 | End: |
136 | */ |