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1 | /* -*-c-*- |
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2 | * |
3 | * Identifies and logs the client of a connection |
4 | * |
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5 | * (c) 1999 Straylight/Edgeware |
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6 | */ |
7 | |
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8 | /*----- Licensing notice --------------------------------------------------* |
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9 | * |
10 | * This file is part of the `fw' port forwarder. |
11 | * |
12 | * `fw' is free software; you can redistribute it and/or modify |
13 | * it under the terms of the GNU General Public License as published by |
14 | * the Free Software Foundation; either version 2 of the License, or |
15 | * (at your option) any later version. |
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16 | * |
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17 | * `fw' is distributed in the hope that it will be useful, |
18 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
20 | * GNU General Public License for more details. |
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21 | * |
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22 | * You should have received a copy of the GNU General Public License |
23 | * along with `fw'; if not, write to the Free Software Foundation, |
24 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
25 | */ |
26 | |
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27 | #include "fw.h" |
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28 | |
29 | /*----- Magic numbers -----------------------------------------------------*/ |
30 | |
31 | #define TIMEOUT 15 /* Seconds to wait for answers */ |
32 | |
33 | /*----- Data structures ---------------------------------------------------*/ |
34 | |
35 | /* --- Structure to track the progress of an identification --- */ |
36 | |
37 | typedef struct id { |
38 | id_req q; /* Copy of client's request block */ |
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39 | time_t when; /* When the connection occurred */ |
40 | conn c; /* Connection selector */ |
41 | unsigned state; /* Current state of the world */ |
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42 | sel_timer t; /* Timeout selector */ |
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43 | bres_client r; /* Backgd resolver client block */ |
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44 | ident_request i; /* Ident client block */ |
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45 | char host[128]; /* Resolved hostname */ |
46 | char user[64]; /* Authenticated client user */ |
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47 | } id; |
48 | |
49 | #define S_HOST 1u /* Read the hostname from resolver */ |
50 | #define S_USER 2u /* Read the username from RFC931 */ |
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51 | #define S_TIMER 4u /* Timeout has completed */ |
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52 | |
53 | /*----- Main code ---------------------------------------------------------*/ |
54 | |
55 | /* --- @id_done@ --- * |
56 | * |
57 | * Arguments: @id *i@ = pointer to identification block |
58 | * |
59 | * Returns: --- |
60 | * |
61 | * Use: Finishes with an identification block. |
62 | */ |
63 | |
64 | static void id_done(id *i) |
65 | { |
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66 | /* --- Close down the various dependent bits --- */ |
67 | |
68 | if (!(i->state & S_HOST)) |
69 | bres_abort(&i->r); |
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70 | if (!(i->state & S_USER)) |
71 | ident_abort(&i->i); |
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72 | if (!(i->state & S_TIMER)) |
73 | sel_rmtimer(&i->t); |
74 | |
75 | /* --- Report the final result --- */ |
76 | |
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77 | fw_log(i->when, "[%s] %s from %s@%s [%s:%u]", |
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78 | i->q.desc, i->q.act, |
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79 | i->user, i->host, |
80 | inet_ntoa(i->q.rsin.sin_addr), (unsigned)ntohs(i->q.rsin.sin_port)); |
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81 | |
82 | /* --- Dispose of the block --- */ |
83 | |
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84 | REFFD_DEC(i->q.r); |
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85 | xfree(i); |
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86 | } |
87 | |
88 | /* --- @id_res@ --- * |
89 | * |
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90 | * Arguments: @struct hostent *h@ = name of the resolved host |
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91 | * @void *vp@ = pointer to identification block |
92 | * |
93 | * Returns: --- |
94 | * |
95 | * Use: Responds to a completed reverse name resolution. |
96 | */ |
97 | |
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98 | static void id_res(struct hostent *h, void *vp) |
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99 | { |
100 | id *i = vp; |
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101 | if (h) |
102 | str_sanitize(i->host, h->h_name, sizeof(i->host)); |
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103 | i->state |= S_HOST; |
104 | if (i->state & S_USER) |
105 | id_done(i); |
106 | } |
107 | |
108 | /* --- @id_ident@ --- * |
109 | * |
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110 | * Arguments: @ident_reply *i@ = pointer to string read from server |
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111 | * @void *vp@ = pointer to identification block |
112 | * |
113 | * Returns: --- |
114 | * |
115 | * Use: Responds to a line read from the remote RFC931 server. |
116 | */ |
117 | |
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118 | static void id_ident(ident_reply *ir, void *vp) |
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119 | { |
120 | id *i = vp; |
121 | |
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122 | /* --- Read the information from the client --- */ |
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123 | |
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124 | if (ir && ir->type == IDENT_USERID) |
125 | str_sanitize(i->user, ir->u.userid.user, sizeof(i->user)); |
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126 | |
127 | /* --- Maybe finish off this identification --- */ |
128 | |
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129 | i->state |= S_USER; |
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130 | if (i->state & S_HOST) |
131 | id_done(i); |
132 | } |
133 | |
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134 | /* --- @id_timer@ --- * |
135 | * |
136 | * Arguments: @struct timeval *tv@ = pointer to the current time |
137 | * @void *vp@ = pointer to identification block |
138 | * |
139 | * Returns: --- |
140 | * |
141 | * Use: Times an identification job out. |
142 | */ |
143 | |
144 | static void id_timer(struct timeval *tv, void *vp) |
145 | { |
146 | id *i = vp; |
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147 | i->state |= S_TIMER; |
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148 | id_done(i); |
149 | } |
150 | |
151 | /* --- @identify@ --- * |
152 | * |
153 | * Arguments: @const id_req *q@ = pointer to request block |
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154 | * |
155 | * Returns: --- |
156 | * |
157 | * Use: Starts a background ident lookup and reverse-resolve job |
158 | * which will, eventually, report a message to the system log. |
159 | */ |
160 | |
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161 | void identify(const id_req *q) |
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162 | { |
163 | id *i; |
164 | |
165 | /* --- Initialize the block with stuff --- */ |
166 | |
167 | i = xmalloc(sizeof(*i)); |
168 | i->q = *q; |
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169 | REFFD_INC(i->q.r); |
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170 | |
171 | str_sanitize(i->host, inet_ntoa(q->rsin.sin_addr), sizeof(i->host)); |
172 | strcpy(i->user, "<ANONYMOUS>"); |
173 | i->state = 0; |
174 | i->when = time(0); |
175 | |
176 | /* --- Set up the connection to the identity server --- */ |
177 | |
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178 | ident(&i->i, sel, &q->lsin, &q->rsin, id_ident, i); |
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179 | |
180 | /* --- Set up the name resolver --- */ |
181 | |
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182 | bres_byaddr(&i->r, q->rsin.sin_addr, id_res, i); |
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183 | |
184 | /* --- Set up the time limiter --- */ |
185 | |
186 | { |
187 | struct timeval tv; |
188 | gettimeofday(&tv, 0); |
189 | tv.tv_sec += TIMEOUT; |
190 | sel_addtimer(sel, &i->t, &tv, id_timer, i); |
191 | } |
192 | } |
193 | |
194 | /*----- That's all, folks -------------------------------------------------*/ |