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0469849f AC |
1 | |
2 | #include "stdinc.h" | |
3 | #include "modules.h" | |
4 | #include "hook.h" | |
5 | #include "client.h" | |
6 | #include "ircd.h" | |
7 | #include "send.h" | |
8 | #include "s_conf.h" | |
9 | #include "s_user.h" | |
10 | #include "s_serv.h" | |
11 | #include "numeric.h" | |
12 | ||
13 | /* if you're modifying this module, you'll probably to change this */ | |
14 | #define KEY 0x13748cfa | |
15 | ||
16 | static int | |
17 | _modinit(void) | |
18 | { | |
19 | /* add the usermode to the available slot */ | |
20 | user_modes['h'] = find_umode_slot(); | |
21 | construct_umodebuf(); | |
22 | ||
23 | return 0; | |
24 | } | |
25 | ||
26 | static void | |
27 | _moddeinit(void) | |
28 | { | |
29 | /* disable the umode and remove it from the available list */ | |
30 | user_modes['h'] = 0; | |
31 | construct_umodebuf(); | |
32 | } | |
33 | ||
34 | static void check_umode_change(void *data); | |
35 | static void check_new_user(void *data); | |
36 | mapi_hfn_list_av1 ip_cloaking_hfnlist[] = { | |
37 | { "umode_changed", (hookfn) check_umode_change }, | |
38 | { "new_local_user", (hookfn) check_new_user }, | |
39 | { NULL, NULL } | |
40 | }; | |
41 | ||
42 | DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL, | |
43 | ip_cloaking_hfnlist, "$Revision: 3526 $"); | |
44 | ||
45 | static void | |
29d224a1 | 46 | distribute_hostchange(struct Client *client_p, char *newhost) |
0469849f | 47 | { |
29d224a1 KB |
48 | if (newhost != client_p->orighost) |
49 | sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :is now your hidden host", | |
9f409b63 | 50 | newhost); |
0469849f | 51 | else |
29d224a1 | 52 | sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :hostname reset", |
9f409b63 | 53 | newhost); |
0469849f AC |
54 | |
55 | sendto_server(NULL, NULL, | |
56 | CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s", | |
9f409b63 | 57 | use_id(&me), use_id(client_p), newhost); |
0469849f AC |
58 | sendto_server(NULL, NULL, |
59 | CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s", | |
9f409b63 | 60 | use_id(&me), use_id(client_p), newhost); |
29d224a1 KB |
61 | |
62 | change_nick_user_host(client_p, client_p->name, client_p->username, newhost, 0, "Changing host"); | |
63 | ||
64 | if (newhost != client_p->orighost) | |
65 | SetDynSpoof(client_p); | |
0469849f | 66 | else |
29d224a1 | 67 | ClearDynSpoof(client_p); |
0469849f AC |
68 | } |
69 | ||
70 | #define Nval 0x8c3a48ac | |
71 | #define HOSTLEN 63 | |
72 | #define INITDATA "98fwqefnoiqefv03f423t34gbv3vb89tg432t3b8" /* change this */ | |
73 | ||
74 | static inline unsigned int | |
75 | get_string_entropy(const char *inbuf) | |
76 | { | |
77 | unsigned int accum = 1; | |
78 | ||
79 | while(*inbuf != '\0') | |
80 | accum += *inbuf++; | |
81 | ||
82 | return accum; | |
83 | } | |
84 | ||
85 | /* calls get_string_entropy() and toasts it against INITDATA */ | |
86 | static inline unsigned int | |
87 | get_string_weighted_entropy(const char *inbuf) | |
88 | { | |
89 | static int base_entropy = 0; | |
90 | unsigned int accum = get_string_entropy(inbuf); | |
91 | ||
92 | /* initialize the algorithm if it is not yet ready */ | |
93 | if (base_entropy == 0) | |
94 | base_entropy = get_string_entropy(INITDATA); | |
95 | ||
96 | return (Nval * accum) ^ base_entropy; | |
97 | } | |
98 | ||
99 | static void | |
100 | do_host_cloak_ip(const char *inbuf, char *outbuf) | |
101 | { | |
102 | char *tptr; | |
103 | unsigned int accum = get_string_weighted_entropy(inbuf); | |
104 | char buf[HOSTLEN]; | |
105 | int ipv6 = 0; | |
106 | ||
107 | strncpy(buf, inbuf, HOSTLEN); | |
108 | tptr = strrchr(buf, '.'); | |
109 | ||
110 | if (tptr == NULL) | |
111 | { | |
112 | tptr = strrchr(buf, ':'); | |
113 | ipv6 = 1; | |
114 | } | |
115 | ||
116 | if (tptr == NULL) | |
117 | { | |
118 | strncpy(outbuf, inbuf, HOSTLEN); | |
119 | return; | |
120 | } | |
121 | ||
122 | *tptr++ = '\0'; | |
123 | ||
124 | if(ipv6) | |
125 | { | |
5203cba5 | 126 | snprintf(outbuf, HOSTLEN, "%s:%x", buf, accum); |
0469849f AC |
127 | } |
128 | else | |
129 | { | |
5203cba5 | 130 | snprintf(outbuf, HOSTLEN, "%s.%x", buf, accum); |
0469849f AC |
131 | } |
132 | } | |
133 | ||
134 | static void | |
135 | do_host_cloak_host(const char *inbuf, char *outbuf) | |
136 | { | |
137 | char b26_alphabet[] = "abcdefghijklmnopqrstuvwxyz"; | |
138 | char *tptr; | |
139 | unsigned int accum = get_string_weighted_entropy(inbuf); | |
140 | ||
141 | strncpy(outbuf, inbuf, HOSTLEN); | |
142 | ||
55abcbb2 | 143 | /* pass 1: scramble first section of hostname using base26 |
0469849f AC |
144 | * alphabet toasted against the weighted entropy of the string. |
145 | * | |
146 | * numbers are not changed at this time, only letters. | |
147 | */ | |
148 | for (tptr = outbuf; *tptr != '\0'; tptr++) | |
149 | { | |
150 | if (*tptr == '.') | |
151 | break; | |
152 | ||
29c92cf9 | 153 | if (isdigit((unsigned char)*tptr) || *tptr == '-') |
0469849f AC |
154 | continue; |
155 | ||
156 | *tptr = b26_alphabet[(*tptr * accum) % 26]; | |
157 | } | |
158 | ||
159 | /* pass 2: scramble each number in the address */ | |
160 | for (tptr = outbuf; *tptr != '\0'; tptr++) | |
161 | { | |
29c92cf9 | 162 | if (isdigit((unsigned char)*tptr)) |
0469849f AC |
163 | { |
164 | *tptr = 48 + ((*tptr * accum) % 10); | |
165 | } | |
55abcbb2 | 166 | } |
0469849f AC |
167 | } |
168 | ||
169 | static void | |
170 | check_umode_change(void *vdata) | |
171 | { | |
172 | hook_data_umode_changed *data = (hook_data_umode_changed *)vdata; | |
173 | struct Client *source_p = data->client; | |
174 | ||
175 | if (!MyClient(source_p)) | |
176 | return; | |
177 | ||
178 | /* didn't change +h umode, we don't need to do anything */ | |
179 | if (!((data->oldumodes ^ source_p->umodes) & user_modes['h'])) | |
180 | return; | |
181 | ||
182 | if (source_p->umodes & user_modes['h']) | |
183 | { | |
184 | if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost))) | |
185 | { | |
186 | source_p->umodes &= ~user_modes['h']; | |
187 | return; | |
188 | } | |
189 | if (strcmp(source_p->host, source_p->localClient->mangledhost)) | |
190 | { | |
29d224a1 | 191 | distribute_hostchange(source_p, source_p->localClient->mangledhost); |
0469849f AC |
192 | } |
193 | else /* not really nice, but we need to send this numeric here */ | |
194 | sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host", | |
195 | source_p->host); | |
196 | } | |
197 | else if (!(source_p->umodes & user_modes['h'])) | |
198 | { | |
199 | if (source_p->localClient->mangledhost != NULL && | |
200 | !strcmp(source_p->host, source_p->localClient->mangledhost)) | |
201 | { | |
29d224a1 | 202 | distribute_hostchange(source_p, source_p->orighost); |
0469849f AC |
203 | } |
204 | } | |
205 | } | |
206 | ||
207 | static void | |
208 | check_new_user(void *vdata) | |
209 | { | |
210 | struct Client *source_p = (void *)vdata; | |
211 | ||
212 | if (IsIPSpoof(source_p)) | |
213 | { | |
214 | source_p->umodes &= ~user_modes['h']; | |
215 | return; | |
216 | } | |
217 | source_p->localClient->mangledhost = rb_malloc(HOSTLEN); | |
218 | if (!irccmp(source_p->orighost, source_p->sockhost)) | |
219 | do_host_cloak_ip(source_p->orighost, source_p->localClient->mangledhost); | |
220 | else | |
221 | do_host_cloak_host(source_p->orighost, source_p->localClient->mangledhost); | |
222 | if (IsDynSpoof(source_p)) | |
223 | source_p->umodes &= ~user_modes['h']; | |
224 | if (source_p->umodes & user_modes['h']) | |
225 | { | |
226 | rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host)); | |
227 | if (irccmp(source_p->host, source_p->orighost)) | |
228 | SetDynSpoof(source_p); | |
229 | } | |
230 | } |