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212380e3 | 1 | /* |
2 | * charybdis: A slightly useful ircd. | |
3 | * blacklist.c: Manages DNS blacklist entries and lookups | |
4 | * | |
eb6e811f | 5 | * Copyright (C) 2006-2008 charybdis development team |
212380e3 | 6 | * |
7 | * Redistribution and use in source and binary forms, with or without | |
8 | * modification, are permitted provided that the following conditions are | |
9 | * met: | |
10 | * | |
11 | * 1. Redistributions of source code must retain the above copyright notice, | |
12 | * this list of conditions and the following disclaimer. | |
13 | * | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * | |
18 | * 3. The name of the author may not be used to endorse or promote products | |
19 | * derived from this software without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR | |
22 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
23 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE | |
24 | * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, | |
25 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES | |
26 | * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR | |
27 | * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | |
29 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING | |
30 | * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | |
31 | * POSSIBILITY OF SUCH DAMAGE. | |
32 | * | |
212380e3 | 33 | */ |
34 | ||
35 | #include "stdinc.h" | |
36 | #include "client.h" | |
37 | #include "res.h" | |
212380e3 | 38 | #include "numeric.h" |
39 | #include "reject.h" | |
40 | #include "s_conf.h" | |
41 | #include "s_user.h" | |
42 | #include "blacklist.h" | |
43 | ||
38e6acdd | 44 | rb_dlink_list blacklist_list = { NULL, NULL, 0 }; |
212380e3 | 45 | |
46 | /* private interfaces */ | |
47 | static struct Blacklist *find_blacklist(char *name) | |
48 | { | |
38e6acdd | 49 | rb_dlink_node *nptr; |
212380e3 | 50 | |
38e6acdd | 51 | RB_DLINK_FOREACH(nptr, blacklist_list.head) |
212380e3 | 52 | { |
53 | struct Blacklist *blptr = (struct Blacklist *) nptr->data; | |
54 | ||
55 | if (!irccmp(blptr->host, name)) | |
56 | return blptr; | |
57 | } | |
58 | ||
59 | return NULL; | |
60 | } | |
61 | ||
62 | static void blacklist_dns_callback(void *vptr, struct DNSReply *reply) | |
63 | { | |
64 | struct BlacklistClient *blcptr = (struct BlacklistClient *) vptr; | |
bc71fb3f | 65 | int listed = 0; |
212380e3 | 66 | |
67 | if (blcptr == NULL || blcptr->client_p == NULL) | |
68 | return; | |
69 | ||
70 | if (blcptr->client_p->preClient == NULL) | |
71 | { | |
72 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
73 | "blacklist_dns_callback(): blcptr->client_p->preClient (%s) is NULL", get_client_name(blcptr->client_p, HIDE_IP)); | |
90a3c35b | 74 | rb_free(blcptr); |
212380e3 | 75 | return; |
76 | } | |
77 | ||
bc71fb3f JT |
78 | if (reply != NULL) |
79 | { | |
9a9f3cf8 | 80 | /* only accept 127.x.y.z as a listing */ |
c41a85df | 81 | if (reply->addr.ss_family == AF_INET && |
9a9f3cf8 | 82 | !memcmp(&((struct sockaddr_in *)&reply->addr)->sin_addr, "\177", 1)) |
c41a85df | 83 | listed = TRUE; |
9f6bbe3c | 84 | else if (blcptr->blacklist->lastwarning + 3600 < rb_current_time()) |
c41a85df JT |
85 | { |
86 | sendto_realops_snomask(SNO_GENERAL, L_ALL, | |
87 | "Garbage reply from blacklist %s", | |
88 | blcptr->blacklist->host); | |
9f6bbe3c | 89 | blcptr->blacklist->lastwarning = rb_current_time(); |
c41a85df | 90 | } |
bc71fb3f JT |
91 | } |
92 | ||
212380e3 | 93 | /* they have a blacklist entry for this client */ |
bc71fb3f | 94 | if (listed && blcptr->client_p->preClient->dnsbl_listed == NULL) |
212380e3 | 95 | { |
96 | blcptr->client_p->preClient->dnsbl_listed = blcptr->blacklist; | |
97 | /* reference to blacklist moves from blcptr to client_p->preClient... */ | |
98 | } | |
99 | else | |
100 | unref_blacklist(blcptr->blacklist); | |
101 | ||
38e6acdd | 102 | rb_dlinkDelete(&blcptr->node, &blcptr->client_p->preClient->dnsbl_queries); |
212380e3 | 103 | |
104 | /* yes, it can probably happen... */ | |
38e6acdd | 105 | if (rb_dlink_list_length(&blcptr->client_p->preClient->dnsbl_queries) == 0 && blcptr->client_p->flags & FLAGS_SENTUSER && !EmptyString(blcptr->client_p->name)) |
212380e3 | 106 | { |
107 | char buf[USERLEN + 1]; | |
907468c4 | 108 | rb_strlcpy(buf, blcptr->client_p->username, sizeof buf); |
212380e3 | 109 | register_local_user(blcptr->client_p, blcptr->client_p, buf); |
110 | } | |
111 | ||
90a3c35b | 112 | rb_free(blcptr); |
212380e3 | 113 | } |
114 | ||
115 | /* XXX: no IPv6 implementation, not to concerned right now though. */ | |
116 | static void initiate_blacklist_dnsquery(struct Blacklist *blptr, struct Client *client_p) | |
117 | { | |
8e43b0b4 | 118 | struct BlacklistClient *blcptr = rb_malloc(sizeof(struct BlacklistClient)); |
570ca08a | 119 | char buf[IRCD_RES_HOSTLEN + 1]; |
212380e3 | 120 | int ip[4]; |
121 | ||
122 | blcptr->blacklist = blptr; | |
123 | blcptr->client_p = client_p; | |
124 | ||
125 | blcptr->dns_query.ptr = blcptr; | |
126 | blcptr->dns_query.callback = blacklist_dns_callback; | |
127 | ||
128 | /* XXX: yes I know this is bad, I don't really care right now */ | |
129 | sscanf(client_p->sockhost, "%d.%d.%d.%d", &ip[3], &ip[2], &ip[1], &ip[0]); | |
130 | ||
131 | /* becomes 2.0.0.127.torbl.ahbl.org or whatever */ | |
570ca08a | 132 | rb_snprintf(buf, sizeof buf, "%d.%d.%d.%d.%s", ip[0], ip[1], ip[2], ip[3], blptr->host); |
212380e3 | 133 | |
134 | gethost_byname_type(buf, &blcptr->dns_query, T_A); | |
135 | ||
38e6acdd | 136 | rb_dlinkAdd(blcptr, &blcptr->node, &client_p->preClient->dnsbl_queries); |
212380e3 | 137 | blptr->refcount++; |
138 | } | |
139 | ||
140 | /* public interfaces */ | |
141 | struct Blacklist *new_blacklist(char *name, char *reject_reason) | |
142 | { | |
143 | struct Blacklist *blptr; | |
144 | ||
145 | if (name == NULL || reject_reason == NULL) | |
146 | return NULL; | |
147 | ||
148 | blptr = find_blacklist(name); | |
149 | if (blptr == NULL) | |
150 | { | |
8e43b0b4 | 151 | blptr = rb_malloc(sizeof(struct Blacklist)); |
38e6acdd | 152 | rb_dlinkAddAlloc(blptr, &blacklist_list); |
212380e3 | 153 | } |
154 | else | |
155 | blptr->status &= ~CONF_ILLEGAL; | |
570ca08a | 156 | rb_strlcpy(blptr->host, name, IRCD_RES_HOSTLEN + 1); |
907468c4 | 157 | rb_strlcpy(blptr->reject_reason, reject_reason, IRCD_BUFSIZE); |
c41a85df | 158 | blptr->lastwarning = 0; |
212380e3 | 159 | |
160 | return blptr; | |
161 | } | |
162 | ||
163 | void unref_blacklist(struct Blacklist *blptr) | |
164 | { | |
165 | blptr->refcount--; | |
166 | if (blptr->status & CONF_ILLEGAL && blptr->refcount <= 0) | |
167 | { | |
38e6acdd | 168 | rb_dlinkFindDestroy(blptr, &blacklist_list); |
90a3c35b | 169 | rb_free(blptr); |
212380e3 | 170 | } |
171 | } | |
172 | ||
173 | void lookup_blacklists(struct Client *client_p) | |
174 | { | |
38e6acdd | 175 | rb_dlink_node *nptr; |
212380e3 | 176 | |
177 | /* We don't do IPv6 right now, sorry! */ | |
178 | if (client_p->localClient->ip.ss_family == AF_INET6) | |
179 | return; | |
180 | ||
38e6acdd | 181 | RB_DLINK_FOREACH(nptr, blacklist_list.head) |
212380e3 | 182 | { |
183 | struct Blacklist *blptr = (struct Blacklist *) nptr->data; | |
184 | ||
185 | if (!(blptr->status & CONF_ILLEGAL)) | |
186 | initiate_blacklist_dnsquery(blptr, client_p); | |
187 | } | |
188 | } | |
189 | ||
190 | void abort_blacklist_queries(struct Client *client_p) | |
191 | { | |
90a3c35b | 192 | rb_dlink_node *ptr, *next_ptr; |
212380e3 | 193 | struct BlacklistClient *blcptr; |
194 | ||
195 | if (client_p->preClient == NULL) | |
196 | return; | |
90a3c35b | 197 | RB_DLINK_FOREACH_SAFE(ptr, next_ptr, client_p->preClient->dnsbl_queries.head) |
212380e3 | 198 | { |
199 | blcptr = ptr->data; | |
38e6acdd | 200 | rb_dlinkDelete(&blcptr->node, &client_p->preClient->dnsbl_queries); |
212380e3 | 201 | unref_blacklist(blcptr->blacklist); |
202 | delete_resolver_queries(&blcptr->dns_query); | |
90a3c35b | 203 | rb_free(blcptr); |
212380e3 | 204 | } |
205 | } | |
206 | ||
207 | void destroy_blacklists(void) | |
208 | { | |
90a3c35b | 209 | rb_dlink_node *ptr, *next_ptr; |
212380e3 | 210 | struct Blacklist *blptr; |
211 | ||
90a3c35b | 212 | RB_DLINK_FOREACH_SAFE(ptr, next_ptr, blacklist_list.head) |
212380e3 | 213 | { |
214 | blptr = ptr->data; | |
215 | blptr->hits = 0; /* keep it simple and consistent */ | |
216 | if (blptr->refcount > 0) | |
217 | blptr->status |= CONF_ILLEGAL; | |
218 | else | |
219 | { | |
90a3c35b | 220 | rb_free(ptr->data); |
38e6acdd | 221 | rb_dlinkDestroy(ptr, &blacklist_list); |
212380e3 | 222 | } |
223 | } | |
224 | } |