e82f7154 |
1 | /* -*-c-*- |
2 | * |
bdbbfcd4 |
3 | * $Id: identify.c,v 1.9 2003/11/29 22:13:43 mdw Exp $ |
e82f7154 |
4 | * |
5 | * Identifies and logs the client of a connection |
6 | * |
e5398e09 |
7 | * (c) 1999 Straylight/Edgeware |
e82f7154 |
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 $ |
bdbbfcd4 |
32 | * Revision 1.9 2003/11/29 22:13:43 mdw |
33 | * Fix bug in identification timout handling. |
34 | * |
ee599f55 |
35 | * Revision 1.8 2003/11/29 20:36:07 mdw |
36 | * Privileged outgoing connections. |
37 | * |
b0805b27 |
38 | * Revision 1.7 2002/02/22 23:43:32 mdw |
39 | * Call @xfree@ rather than @free@. |
40 | * |
fab71203 |
41 | * Revision 1.6 2001/06/22 19:36:49 mdw |
42 | * Enlarge the identity buffer. |
43 | * |
16dfe536 |
44 | * Revision 1.5 1999/10/10 16:45:34 mdw |
45 | * Modified to use new mLib resolver and ident client. |
46 | * |
e0ce9d38 |
47 | * Revision 1.4 1999/07/27 18:30:53 mdw |
48 | * Various minor portability fixes. |
49 | * |
e5398e09 |
50 | * Revision 1.3 1999/07/26 23:26:21 mdw |
51 | * Minor modifications for new design. |
52 | * |
793f69cd |
53 | * Revision 1.2 1999/07/03 13:56:59 mdw |
54 | * Log connections to syslog or stderr as appropriate. |
55 | * |
56 | * Revision 1.1.1.1 1999/07/01 08:56:23 mdw |
57 | * Initial revision. |
e82f7154 |
58 | * |
59 | */ |
60 | |
61 | /*----- Header files ------------------------------------------------------*/ |
62 | |
63 | #include "config.h" |
64 | |
65 | #include <errno.h> |
66 | #include <stdio.h> |
67 | #include <stdlib.h> |
68 | #include <string.h> |
69 | #include <time.h> |
70 | |
71 | #include <sys/types.h> |
72 | #include <sys/time.h> |
73 | #include <unistd.h> |
74 | #include <syslog.h> |
75 | |
76 | #include <sys/socket.h> |
77 | #include <netinet/in.h> |
78 | #include <arpa/inet.h> |
79 | #include <netdb.h> |
80 | |
81 | #include <mLib/alloc.h> |
16dfe536 |
82 | #include <mLib/bres.h> |
e82f7154 |
83 | #include <mLib/conn.h> |
84 | #include <mLib/dstr.h> |
16dfe536 |
85 | #include <mLib/ident.h> |
e82f7154 |
86 | #include <mLib/report.h> |
87 | #include <mLib/sel.h> |
88 | #include <mLib/selbuf.h> |
89 | #include <mLib/str.h> |
90 | |
e82f7154 |
91 | #include "fw.h" |
e82f7154 |
92 | #include "identify.h" |
93 | |
94 | /*----- Magic numbers -----------------------------------------------------*/ |
95 | |
96 | #define TIMEOUT 15 /* Seconds to wait for answers */ |
97 | |
98 | /*----- Data structures ---------------------------------------------------*/ |
99 | |
100 | /* --- Structure to track the progress of an identification --- */ |
101 | |
102 | typedef struct id { |
103 | id_req q; /* Copy of client's request block */ |
e82f7154 |
104 | time_t when; /* When the connection occurred */ |
105 | conn c; /* Connection selector */ |
106 | unsigned state; /* Current state of the world */ |
16dfe536 |
107 | sel_timer t; /* Timeout selector */ |
e82f7154 |
108 | bres_client r; /* Backgd resolver client block */ |
16dfe536 |
109 | ident_request i; /* Ident client block */ |
fab71203 |
110 | char host[128]; /* Resolved hostname */ |
111 | char user[64]; /* Authenticated client user */ |
e82f7154 |
112 | } id; |
113 | |
114 | #define S_HOST 1u /* Read the hostname from resolver */ |
115 | #define S_USER 2u /* Read the username from RFC931 */ |
16dfe536 |
116 | #define S_TIMER 4u /* Timeout has completed */ |
e82f7154 |
117 | |
118 | /*----- Main code ---------------------------------------------------------*/ |
119 | |
120 | /* --- @id_done@ --- * |
121 | * |
122 | * Arguments: @id *i@ = pointer to identification block |
123 | * |
124 | * Returns: --- |
125 | * |
126 | * Use: Finishes with an identification block. |
127 | */ |
128 | |
129 | static void id_done(id *i) |
130 | { |
e82f7154 |
131 | /* --- Close down the various dependent bits --- */ |
132 | |
133 | if (!(i->state & S_HOST)) |
134 | bres_abort(&i->r); |
16dfe536 |
135 | if (!(i->state & S_USER)) |
136 | ident_abort(&i->i); |
e82f7154 |
137 | if (!(i->state & S_TIMER)) |
138 | sel_rmtimer(&i->t); |
139 | |
140 | /* --- Report the final result --- */ |
141 | |
ee599f55 |
142 | fw_log(i->when, "[%s] %s from %s@%s [%s:%u]", |
e5398e09 |
143 | i->q.desc, i->q.act, |
ee599f55 |
144 | i->user, i->host, |
145 | inet_ntoa(i->q.rsin.sin_addr), (unsigned)ntohs(i->q.rsin.sin_port)); |
e82f7154 |
146 | |
147 | /* --- Dispose of the block --- */ |
148 | |
e5398e09 |
149 | REFFD_DEC(i->q.r); |
b0805b27 |
150 | xfree(i); |
e82f7154 |
151 | } |
152 | |
153 | /* --- @id_res@ --- * |
154 | * |
16dfe536 |
155 | * Arguments: @struct hostent *h@ = name of the resolved host |
e82f7154 |
156 | * @void *vp@ = pointer to identification block |
157 | * |
158 | * Returns: --- |
159 | * |
160 | * Use: Responds to a completed reverse name resolution. |
161 | */ |
162 | |
16dfe536 |
163 | static void id_res(struct hostent *h, void *vp) |
e82f7154 |
164 | { |
165 | id *i = vp; |
16dfe536 |
166 | if (h) |
167 | str_sanitize(i->host, h->h_name, sizeof(i->host)); |
e82f7154 |
168 | i->state |= S_HOST; |
169 | if (i->state & S_USER) |
170 | id_done(i); |
171 | } |
172 | |
173 | /* --- @id_ident@ --- * |
174 | * |
16dfe536 |
175 | * Arguments: @ident_reply *i@ = pointer to string read from server |
e82f7154 |
176 | * @void *vp@ = pointer to identification block |
177 | * |
178 | * Returns: --- |
179 | * |
180 | * Use: Responds to a line read from the remote RFC931 server. |
181 | */ |
182 | |
16dfe536 |
183 | static void id_ident(ident_reply *ir, void *vp) |
e82f7154 |
184 | { |
185 | id *i = vp; |
186 | |
16dfe536 |
187 | /* --- Read the information from the client --- */ |
e82f7154 |
188 | |
16dfe536 |
189 | if (ir && ir->type == IDENT_USERID) |
190 | str_sanitize(i->user, ir->u.userid.user, sizeof(i->user)); |
e82f7154 |
191 | |
192 | /* --- Maybe finish off this identification --- */ |
193 | |
16dfe536 |
194 | i->state |= S_USER; |
e82f7154 |
195 | if (i->state & S_HOST) |
196 | id_done(i); |
197 | } |
198 | |
e82f7154 |
199 | /* --- @id_timer@ --- * |
200 | * |
201 | * Arguments: @struct timeval *tv@ = pointer to the current time |
202 | * @void *vp@ = pointer to identification block |
203 | * |
204 | * Returns: --- |
205 | * |
206 | * Use: Times an identification job out. |
207 | */ |
208 | |
209 | static void id_timer(struct timeval *tv, void *vp) |
210 | { |
211 | id *i = vp; |
bdbbfcd4 |
212 | i->state |= S_TIMER: |
e82f7154 |
213 | id_done(i); |
214 | } |
215 | |
216 | /* --- @identify@ --- * |
217 | * |
218 | * Arguments: @const id_req *q@ = pointer to request block |
e82f7154 |
219 | * |
220 | * Returns: --- |
221 | * |
222 | * Use: Starts a background ident lookup and reverse-resolve job |
223 | * which will, eventually, report a message to the system log. |
224 | */ |
225 | |
e5398e09 |
226 | void identify(const id_req *q) |
e82f7154 |
227 | { |
228 | id *i; |
229 | |
230 | /* --- Initialize the block with stuff --- */ |
231 | |
232 | i = xmalloc(sizeof(*i)); |
233 | i->q = *q; |
e5398e09 |
234 | REFFD_INC(i->q.r); |
e82f7154 |
235 | |
236 | str_sanitize(i->host, inet_ntoa(q->rsin.sin_addr), sizeof(i->host)); |
237 | strcpy(i->user, "<ANONYMOUS>"); |
238 | i->state = 0; |
239 | i->when = time(0); |
240 | |
241 | /* --- Set up the connection to the identity server --- */ |
242 | |
16dfe536 |
243 | ident(&i->i, sel, &q->lsin, &q->rsin, id_ident, i); |
e82f7154 |
244 | |
245 | /* --- Set up the name resolver --- */ |
246 | |
16dfe536 |
247 | bres_byaddr(&i->r, q->rsin.sin_addr, id_res, i); |
e82f7154 |
248 | |
249 | /* --- Set up the time limiter --- */ |
250 | |
251 | { |
252 | struct timeval tv; |
253 | gettimeofday(&tv, 0); |
254 | tv.tv_sec += TIMEOUT; |
255 | sel_addtimer(sel, &i->t, &tv, id_timer, i); |
256 | } |
257 | } |
258 | |
259 | /*----- That's all, folks -------------------------------------------------*/ |