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1 | /* -*-c-*- |
2 | * |
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3 | * $Id: identify.c,v 1.10 2003/11/29 22:15:19 mdw Exp $ |
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4 | * |
5 | * Identifies and logs the client of a connection |
6 | * |
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7 | * (c) 1999 Straylight/Edgeware |
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8 | */ |
9 | |
10 | /*----- Licensing notice --------------------------------------------------* |
11 | * |
12 | * This file is part of the `fw' port forwarder. |
13 | * |
14 | * `fw' is free software; you can redistribute it and/or modify |
15 | * it under the terms of the GNU General Public License as published by |
16 | * the Free Software Foundation; either version 2 of the License, or |
17 | * (at your option) any later version. |
18 | * |
19 | * `fw' is distributed in the hope that it will be useful, |
20 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
21 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
22 | * GNU General Public License for more details. |
23 | * |
24 | * You should have received a copy of the GNU General Public License |
25 | * along with `fw'; if not, write to the Free Software Foundation, |
26 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
27 | */ |
28 | |
29 | /*----- Revision history --------------------------------------------------* |
30 | * |
31 | * $Log: identify.c,v $ |
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32 | * Revision 1.10 2003/11/29 22:15:19 mdw |
33 | * And a typo fix. |
34 | * |
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35 | * Revision 1.9 2003/11/29 22:13:43 mdw |
36 | * Fix bug in identification timout handling. |
37 | * |
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38 | * Revision 1.8 2003/11/29 20:36:07 mdw |
39 | * Privileged outgoing connections. |
40 | * |
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41 | * Revision 1.7 2002/02/22 23:43:32 mdw |
42 | * Call @xfree@ rather than @free@. |
43 | * |
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44 | * Revision 1.6 2001/06/22 19:36:49 mdw |
45 | * Enlarge the identity buffer. |
46 | * |
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47 | * Revision 1.5 1999/10/10 16:45:34 mdw |
48 | * Modified to use new mLib resolver and ident client. |
49 | * |
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50 | * Revision 1.4 1999/07/27 18:30:53 mdw |
51 | * Various minor portability fixes. |
52 | * |
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53 | * Revision 1.3 1999/07/26 23:26:21 mdw |
54 | * Minor modifications for new design. |
55 | * |
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56 | * Revision 1.2 1999/07/03 13:56:59 mdw |
57 | * Log connections to syslog or stderr as appropriate. |
58 | * |
59 | * Revision 1.1.1.1 1999/07/01 08:56:23 mdw |
60 | * Initial revision. |
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61 | * |
62 | */ |
63 | |
64 | /*----- Header files ------------------------------------------------------*/ |
65 | |
66 | #include "config.h" |
67 | |
68 | #include <errno.h> |
69 | #include <stdio.h> |
70 | #include <stdlib.h> |
71 | #include <string.h> |
72 | #include <time.h> |
73 | |
74 | #include <sys/types.h> |
75 | #include <sys/time.h> |
76 | #include <unistd.h> |
77 | #include <syslog.h> |
78 | |
79 | #include <sys/socket.h> |
80 | #include <netinet/in.h> |
81 | #include <arpa/inet.h> |
82 | #include <netdb.h> |
83 | |
84 | #include <mLib/alloc.h> |
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85 | #include <mLib/bres.h> |
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86 | #include <mLib/conn.h> |
87 | #include <mLib/dstr.h> |
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88 | #include <mLib/ident.h> |
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89 | #include <mLib/report.h> |
90 | #include <mLib/sel.h> |
91 | #include <mLib/selbuf.h> |
92 | #include <mLib/str.h> |
93 | |
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94 | #include "fw.h" |
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95 | #include "identify.h" |
96 | |
97 | /*----- Magic numbers -----------------------------------------------------*/ |
98 | |
99 | #define TIMEOUT 15 /* Seconds to wait for answers */ |
100 | |
101 | /*----- Data structures ---------------------------------------------------*/ |
102 | |
103 | /* --- Structure to track the progress of an identification --- */ |
104 | |
105 | typedef struct id { |
106 | id_req q; /* Copy of client's request block */ |
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107 | time_t when; /* When the connection occurred */ |
108 | conn c; /* Connection selector */ |
109 | unsigned state; /* Current state of the world */ |
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110 | sel_timer t; /* Timeout selector */ |
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111 | bres_client r; /* Backgd resolver client block */ |
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112 | ident_request i; /* Ident client block */ |
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113 | char host[128]; /* Resolved hostname */ |
114 | char user[64]; /* Authenticated client user */ |
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115 | } id; |
116 | |
117 | #define S_HOST 1u /* Read the hostname from resolver */ |
118 | #define S_USER 2u /* Read the username from RFC931 */ |
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119 | #define S_TIMER 4u /* Timeout has completed */ |
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120 | |
121 | /*----- Main code ---------------------------------------------------------*/ |
122 | |
123 | /* --- @id_done@ --- * |
124 | * |
125 | * Arguments: @id *i@ = pointer to identification block |
126 | * |
127 | * Returns: --- |
128 | * |
129 | * Use: Finishes with an identification block. |
130 | */ |
131 | |
132 | static void id_done(id *i) |
133 | { |
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134 | /* --- Close down the various dependent bits --- */ |
135 | |
136 | if (!(i->state & S_HOST)) |
137 | bres_abort(&i->r); |
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138 | if (!(i->state & S_USER)) |
139 | ident_abort(&i->i); |
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140 | if (!(i->state & S_TIMER)) |
141 | sel_rmtimer(&i->t); |
142 | |
143 | /* --- Report the final result --- */ |
144 | |
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145 | fw_log(i->when, "[%s] %s from %s@%s [%s:%u]", |
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146 | i->q.desc, i->q.act, |
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147 | i->user, i->host, |
148 | inet_ntoa(i->q.rsin.sin_addr), (unsigned)ntohs(i->q.rsin.sin_port)); |
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149 | |
150 | /* --- Dispose of the block --- */ |
151 | |
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152 | REFFD_DEC(i->q.r); |
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153 | xfree(i); |
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154 | } |
155 | |
156 | /* --- @id_res@ --- * |
157 | * |
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158 | * Arguments: @struct hostent *h@ = name of the resolved host |
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159 | * @void *vp@ = pointer to identification block |
160 | * |
161 | * Returns: --- |
162 | * |
163 | * Use: Responds to a completed reverse name resolution. |
164 | */ |
165 | |
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166 | static void id_res(struct hostent *h, void *vp) |
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167 | { |
168 | id *i = vp; |
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169 | if (h) |
170 | str_sanitize(i->host, h->h_name, sizeof(i->host)); |
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171 | i->state |= S_HOST; |
172 | if (i->state & S_USER) |
173 | id_done(i); |
174 | } |
175 | |
176 | /* --- @id_ident@ --- * |
177 | * |
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178 | * Arguments: @ident_reply *i@ = pointer to string read from server |
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179 | * @void *vp@ = pointer to identification block |
180 | * |
181 | * Returns: --- |
182 | * |
183 | * Use: Responds to a line read from the remote RFC931 server. |
184 | */ |
185 | |
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186 | static void id_ident(ident_reply *ir, void *vp) |
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187 | { |
188 | id *i = vp; |
189 | |
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190 | /* --- Read the information from the client --- */ |
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191 | |
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192 | if (ir && ir->type == IDENT_USERID) |
193 | str_sanitize(i->user, ir->u.userid.user, sizeof(i->user)); |
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194 | |
195 | /* --- Maybe finish off this identification --- */ |
196 | |
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197 | i->state |= S_USER; |
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198 | if (i->state & S_HOST) |
199 | id_done(i); |
200 | } |
201 | |
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202 | /* --- @id_timer@ --- * |
203 | * |
204 | * Arguments: @struct timeval *tv@ = pointer to the current time |
205 | * @void *vp@ = pointer to identification block |
206 | * |
207 | * Returns: --- |
208 | * |
209 | * Use: Times an identification job out. |
210 | */ |
211 | |
212 | static void id_timer(struct timeval *tv, void *vp) |
213 | { |
214 | id *i = vp; |
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215 | i->state |= S_TIMER; |
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216 | id_done(i); |
217 | } |
218 | |
219 | /* --- @identify@ --- * |
220 | * |
221 | * Arguments: @const id_req *q@ = pointer to request block |
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222 | * |
223 | * Returns: --- |
224 | * |
225 | * Use: Starts a background ident lookup and reverse-resolve job |
226 | * which will, eventually, report a message to the system log. |
227 | */ |
228 | |
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229 | void identify(const id_req *q) |
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230 | { |
231 | id *i; |
232 | |
233 | /* --- Initialize the block with stuff --- */ |
234 | |
235 | i = xmalloc(sizeof(*i)); |
236 | i->q = *q; |
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237 | REFFD_INC(i->q.r); |
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238 | |
239 | str_sanitize(i->host, inet_ntoa(q->rsin.sin_addr), sizeof(i->host)); |
240 | strcpy(i->user, "<ANONYMOUS>"); |
241 | i->state = 0; |
242 | i->when = time(0); |
243 | |
244 | /* --- Set up the connection to the identity server --- */ |
245 | |
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246 | ident(&i->i, sel, &q->lsin, &q->rsin, id_ident, i); |
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247 | |
248 | /* --- Set up the name resolver --- */ |
249 | |
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250 | bres_byaddr(&i->r, q->rsin.sin_addr, id_res, i); |
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251 | |
252 | /* --- Set up the time limiter --- */ |
253 | |
254 | { |
255 | struct timeval tv; |
256 | gettimeofday(&tv, 0); |
257 | tv.tv_sec += TIMEOUT; |
258 | sel_addtimer(sel, &i->t, &tv, id_timer, i); |
259 | } |
260 | } |
261 | |
262 | /*----- That's all, folks -------------------------------------------------*/ |