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212380e3 AC |
1 | /* |
2 | * Copyright (c) 2005 William Pitcock <nenolod -at- nenolod.net> | |
3 | * and Jilles Tjoelker <jilles -at- stack.nl> | |
4 | * All rights reserved. | |
5 | * | |
6 | * Redistribution in both source and binary forms are permitted | |
7 | * provided that the above copyright notice remains unchanged. | |
8 | * | |
9 | * m_chghost.c: A module for handling spoofing dynamically. | |
10 | */ | |
11 | ||
12 | #include "stdinc.h" | |
212380e3 AC |
13 | #include "send.h" |
14 | #include "channel.h" | |
15 | #include "client.h" | |
16 | #include "common.h" | |
17 | #include "config.h" | |
18 | #include "ircd.h" | |
19 | #include "numeric.h" | |
212380e3 AC |
20 | #include "s_conf.h" |
21 | #include "s_newconf.h" | |
22 | #include "s_serv.h" | |
23 | #include "s_user.h" | |
24 | #include "hash.h" | |
25 | #include "msg.h" | |
26 | #include "parse.h" | |
27 | #include "modules.h" | |
212380e3 AC |
28 | #include "whowas.h" |
29 | #include "monitor.h" | |
30 | ||
31 | static int me_realhost(struct Client *, struct Client *, int, const char **); | |
32 | static int ms_chghost(struct Client *, struct Client *, int, const char **); | |
33 | static int me_chghost(struct Client *, struct Client *, int, const char **); | |
34 | static int mo_chghost(struct Client *, struct Client *, int, const char **); | |
35 | ||
36 | struct Message realhost_msgtab = { | |
37 | "REALHOST", 0, 0, 0, MFLG_SLOW, | |
38 | {mg_ignore, mg_ignore, mg_ignore, mg_ignore, {me_realhost, 2}, mg_ignore} | |
39 | }; | |
40 | ||
41 | struct Message chghost_msgtab = { | |
42 | "CHGHOST", 0, 0, 0, MFLG_SLOW, | |
43 | {mg_ignore, mg_not_oper, {ms_chghost, 3}, {ms_chghost, 3}, {me_chghost, 3}, {mo_chghost, 3}} | |
44 | }; | |
45 | ||
46 | mapi_clist_av1 chghost_clist[] = { &chghost_msgtab, &realhost_msgtab, NULL }; | |
47 | ||
822a4a25 | 48 | DECLARE_MODULE_AV1(chghost, NULL, NULL, chghost_clist, NULL, NULL, "$Revision: 3424 $"); |
212380e3 AC |
49 | |
50 | /* clean_host() | |
51 | * | |
52 | * input - host to check | |
53 | * output - 0 if erroneous, else 0 | |
54 | * side effects - | |
55 | */ | |
56 | static int | |
57 | clean_host(const char *host) | |
58 | { | |
59 | int len = 0; | |
822a4a25 JT |
60 | |
61 | if (*host == '\0' || *host == ':') | |
62 | return 0; | |
212380e3 AC |
63 | |
64 | for(; *host; host++) | |
65 | { | |
66 | len++; | |
67 | ||
68 | if(!IsHostChar(*host)) | |
69 | return 0; | |
70 | } | |
71 | ||
72 | if(len > HOSTLEN) | |
73 | return 0; | |
74 | ||
75 | return 1; | |
76 | } | |
77 | ||
78 | /* | |
79 | * me_realhost | |
80 | * parv[0] = origin | |
81 | * parv[1] = real host | |
82 | * | |
83 | * Yes this contains a little race condition if someone does a whois | |
84 | * in between the UID and REALHOST and use_whois_actually is enabled. | |
85 | * I don't think that's a big problem as the whole thing is a | |
86 | * race condition. | |
87 | */ | |
88 | static int | |
89 | me_realhost(struct Client *client_p, struct Client *source_p, | |
90 | int parc, const char *parv[]) | |
91 | { | |
92 | if (!IsPerson(source_p)) | |
93 | return 0; | |
94 | ||
95 | del_from_hostname_hash(source_p->orighost, source_p); | |
f427c8b0 | 96 | rb_strlcpy(source_p->orighost, parv[1], sizeof source_p->orighost); |
212380e3 AC |
97 | if (irccmp(source_p->host, source_p->orighost)) |
98 | SetDynSpoof(source_p); | |
99 | else | |
100 | ClearDynSpoof(source_p); | |
101 | add_to_hostname_hash(source_p->orighost, source_p); | |
102 | return 0; | |
103 | } | |
104 | ||
105 | static int | |
106 | do_chghost(struct Client *source_p, struct Client *target_p, | |
107 | const char *newhost, int is_encap) | |
108 | { | |
109 | if (!clean_host(newhost)) | |
110 | { | |
111 | sendto_realops_snomask(SNO_GENERAL, is_encap ? L_ALL : L_NETWIDE, "%s attempted to change hostname for %s to %s (invalid)", | |
112 | IsServer(source_p) ? source_p->name : get_oper_name(source_p), | |
113 | target_p->name, newhost); | |
114 | /* sending this remotely may disclose important | |
115 | * routing information -- jilles */ | |
116 | if (is_encap ? MyClient(target_p) : !ConfigServerHide.flatten_links) | |
117 | sendto_one_notice(target_p, ":*** Notice -- %s attempted to change your hostname to %s (invalid)", | |
118 | source_p->name, newhost); | |
119 | return 0; | |
120 | } | |
121 | change_nick_user_host(target_p, target_p->name, target_p->username, newhost, 0, "Changing host"); | |
122 | if (irccmp(target_p->host, target_p->orighost)) | |
123 | { | |
124 | SetDynSpoof(target_p); | |
125 | if (MyClient(target_p)) | |
126 | sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :is now your hidden host (set by %s)", target_p->host, source_p->name); | |
127 | } | |
128 | else | |
129 | { | |
130 | ClearDynSpoof(target_p); | |
131 | if (MyClient(target_p)) | |
132 | sendto_one_numeric(target_p, RPL_HOSTHIDDEN, "%s :hostname reset by %s", target_p->host, source_p->name); | |
133 | } | |
134 | if (MyClient(source_p)) | |
135 | sendto_one_notice(source_p, ":Changed hostname for %s to %s", target_p->name, target_p->host); | |
136 | if (!IsServer(source_p) && !IsService(source_p)) | |
137 | sendto_realops_snomask(SNO_GENERAL, L_ALL, "%s changed hostname for %s to %s", get_oper_name(source_p), target_p->name, target_p->host); | |
138 | return 1; | |
139 | } | |
140 | ||
141 | /* | |
142 | * ms_chghost | |
143 | * parv[0] = origin | |
144 | * parv[1] = target | |
145 | * parv[2] = host | |
146 | */ | |
147 | static int | |
148 | ms_chghost(struct Client *client_p, struct Client *source_p, | |
149 | int parc, const char *parv[]) | |
150 | { | |
151 | struct Client *target_p; | |
152 | ||
153 | if (!(target_p = find_person(parv[1]))) | |
154 | return -1; | |
155 | ||
156 | if (do_chghost(source_p, target_p, parv[2], 0)) | |
157 | { | |
158 | sendto_server(client_p, NULL, | |
159 | CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s", | |
160 | use_id(source_p), use_id(target_p), parv[2]); | |
161 | sendto_server(client_p, NULL, | |
162 | CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s", | |
163 | use_id(source_p), use_id(target_p), parv[2]); | |
212380e3 AC |
164 | } |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | /* | |
170 | * me_chghost | |
171 | * parv[0] = origin | |
172 | * parv[1] = target | |
173 | * parv[2] = host | |
174 | */ | |
175 | static int | |
176 | me_chghost(struct Client *client_p, struct Client *source_p, | |
177 | int parc, const char *parv[]) | |
178 | { | |
179 | struct Client *target_p; | |
180 | ||
181 | if (!(target_p = find_person(parv[1]))) | |
182 | return -1; | |
183 | ||
184 | do_chghost(source_p, target_p, parv[2], 1); | |
185 | ||
186 | return 0; | |
187 | } | |
188 | ||
189 | /* | |
190 | * mo_chghost | |
191 | * parv[0] = origin | |
192 | * parv[1] = target | |
193 | * parv[2] = host | |
194 | */ | |
195 | /* Disable this because of the abuse potential -- jilles | |
196 | * No, make it toggleable via ./configure. --nenolod | |
197 | */ | |
198 | static int | |
199 | mo_chghost(struct Client *client_p, struct Client *source_p, | |
200 | int parc, const char *parv[]) | |
201 | { | |
202 | #ifdef ENABLE_OPER_CHGHOST | |
203 | struct Client *target_p; | |
204 | ||
205 | if(!IsOperAdmin(source_p)) | |
206 | { | |
207 | sendto_one(source_p, form_str(ERR_NOPRIVS), | |
208 | me.name, source_p->name, "admin"); | |
209 | return 0; | |
210 | } | |
211 | ||
212 | if (!(target_p = find_named_person(parv[1]))) | |
213 | { | |
214 | sendto_one_numeric(source_p, ERR_NOSUCHNICK, | |
215 | form_str(ERR_NOSUCHNICK), parv[1]); | |
216 | return 0; | |
217 | } | |
218 | ||
219 | if (!clean_host(parv[2])) | |
220 | { | |
221 | sendto_one_notice(source_p, ":Hostname %s is invalid", parv[2]); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | do_chghost(source_p, target_p, parv[2], 0); | |
226 | ||
227 | sendto_server(NULL, NULL, | |
228 | CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s %s", | |
229 | use_id(source_p), use_id(target_p), parv[2]); | |
230 | sendto_server(NULL, NULL, | |
231 | CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s", | |
232 | use_id(source_p), use_id(target_p), parv[2]); | |
212380e3 | 233 | #else |
22f2f68a JT |
234 | sendto_one_numeric(source_p, ERR_DISABLED, form_str(ERR_DISABLED), |
235 | "CHGHOST"); | |
212380e3 AC |
236 | #endif |
237 | ||
238 | return 0; | |
239 | } | |
240 |