2 15cacd92 2019-03-29 martijn * Copyright (c) 2019 Martijn van Duren <martijn@openbsd.org>
4 15cacd92 2019-03-29 martijn * Permission to use, copy, modify, and distribute this software for any
5 15cacd92 2019-03-29 martijn * purpose with or without fee is hereby granted, provided that the above
6 15cacd92 2019-03-29 martijn * copyright notice and this permission notice appear in all copies.
8 15cacd92 2019-03-29 martijn * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9 15cacd92 2019-03-29 martijn * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10 15cacd92 2019-03-29 martijn * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11 15cacd92 2019-03-29 martijn * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12 15cacd92 2019-03-29 martijn * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13 15cacd92 2019-03-29 martijn * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14 15cacd92 2019-03-29 martijn * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
16 c75461cd 2019-03-29 martijn #include <sys/tree.h>
17 aeda4d4e 2019-03-28 martijn #include <sys/types.h>
18 a248a3c1 2019-03-27 martijn #include <sys/socket.h>
20 a248a3c1 2019-03-27 martijn #include <errno.h>
21 aeda4d4e 2019-03-28 martijn #include <event.h>
22 a248a3c1 2019-03-27 martijn #include <netdb.h>
23 a248a3c1 2019-03-27 martijn #include <stdlib.h>
24 a248a3c1 2019-03-27 martijn #include <stdio.h>
25 a248a3c1 2019-03-27 martijn #include <string.h>
26 b633fa4c 2019-03-29 martijn #include <syslog.h>
27 a248a3c1 2019-03-27 martijn #include <unistd.h>
28 aeda4d4e 2019-03-28 martijn #include <asr.h>
30 b633fa4c 2019-03-29 martijn #include "log.h"
31 a248a3c1 2019-03-27 martijn #include "smtp_proc.h"
33 aeda4d4e 2019-03-28 martijn struct dnsbl_session;
35 aeda4d4e 2019-03-28 martijn struct dnsbl_query {
36 aeda4d4e 2019-03-28 martijn struct asr_query *query;
37 aeda4d4e 2019-03-28 martijn struct event_asr *event;
38 76e3b8e2 2019-03-28 martijn struct event timeout;
39 aeda4d4e 2019-03-28 martijn int resolved;
40 aeda4d4e 2019-03-28 martijn int blacklist;
41 aeda4d4e 2019-03-28 martijn struct dnsbl_session *session;
44 aeda4d4e 2019-03-28 martijn struct dnsbl_session {
45 aeda4d4e 2019-03-28 martijn uint64_t reqid;
46 aeda4d4e 2019-03-28 martijn uint64_t token;
47 5468729e 2019-03-29 martijn int listed;
48 aeda4d4e 2019-03-28 martijn struct dnsbl_query *query;
49 c75461cd 2019-03-29 martijn RB_ENTRY(dnsbl_session) entry;
52 c75461cd 2019-03-29 martijn RB_HEAD(dnsbl_sessions, dnsbl_session) dnsbl_sessions = RB_INITIALIZER(NULL);
53 c75461cd 2019-03-29 martijn RB_PROTOTYPE(dnsbl_sessions, dnsbl_session, entry, dnsbl_session_cmp);
55 a248a3c1 2019-03-27 martijn static char **blacklists = NULL;
56 a248a3c1 2019-03-27 martijn static size_t nblacklists = 0;
57 5468729e 2019-03-29 martijn static int markspam = 0;
59 a248a3c1 2019-03-27 martijn void usage(void);
60 42a4c512 2019-03-28 martijn void dnsbl_connect(char *, int, struct timespec *, char *, char *, uint64_t,
61 03a6f52a 2019-03-29 martijn uint64_t, char *, struct inx_addr *);
62 5468729e 2019-03-29 martijn void dnsbl_dataline(char *, int, struct timespec *, char *, char *, uint64_t,
63 5468729e 2019-03-29 martijn uint64_t, char *);
64 c75461cd 2019-03-29 martijn void dnsbl_disconnect(char *, int, struct timespec *, char *, char *, uint64_t);
65 aeda4d4e 2019-03-28 martijn void dnsbl_resolve(struct asr_result *, void *);
66 76e3b8e2 2019-03-28 martijn void dnsbl_timeout(int, short, void *);
67 5468729e 2019-03-29 martijn void dnsbl_session_query_done(struct dnsbl_session *);
68 aeda4d4e 2019-03-28 martijn void dnsbl_session_free(struct dnsbl_session *);
69 c75461cd 2019-03-29 martijn int dnsbl_session_cmp(struct dnsbl_session *, struct dnsbl_session *);
72 a248a3c1 2019-03-27 martijn main(int argc, char *argv[])
76 b633fa4c 2019-03-29 martijn int debug = 0;
78 b633fa4c 2019-03-29 martijn while ((ch = getopt(argc, argv, "d:m")) != -1) {
79 a248a3c1 2019-03-27 martijn switch (ch) {
80 b633fa4c 2019-03-29 martijn case 'd':
81 b633fa4c 2019-03-29 martijn debug = 1;
83 5468729e 2019-03-29 martijn case 'm':
84 5468729e 2019-03-29 martijn markspam = 1;
91 b633fa4c 2019-03-29 martijn log_init(debug, LOG_MAIL);
92 b633fa4c 2019-03-29 martijn if (pledge("stdio dns", NULL) == -1)
93 b633fa4c 2019-03-29 martijn fatal("pledge");
95 96a01110 2019-03-29 martijn if ((nblacklists = argc - optind) == 0)
96 b633fa4c 2019-03-29 martijn fatalx("No blacklist specified");
98 deafb383 2019-03-29 martijn if ((blacklists = calloc(nblacklists, sizeof(*blacklists))) == NULL)
99 b633fa4c 2019-03-29 martijn fatal(NULL);
100 deafb383 2019-03-29 martijn for (i = 0; i < nblacklists; i++)
101 deafb383 2019-03-29 martijn blacklists[i] = argv[optind + i];
103 a248a3c1 2019-03-27 martijn smtp_register_filter_connect(dnsbl_connect);
104 deafb383 2019-03-29 martijn if (markspam)
105 deafb383 2019-03-29 martijn smtp_register_filter_dataline(dnsbl_dataline);
106 c75461cd 2019-03-29 martijn smtp_in_register_report_disconnect(dnsbl_disconnect);
107 b633fa4c 2019-03-29 martijn smtp_run(debug);
109 a248a3c1 2019-03-27 martijn return 0;
113 42a4c512 2019-03-28 martijn dnsbl_connect(char *type, int version, struct timespec *tm, char *direction,
114 03a6f52a 2019-03-29 martijn char *phase, uint64_t reqid, uint64_t token, char *hostname,
115 03a6f52a 2019-03-29 martijn struct inx_addr *xaddr)
117 aeda4d4e 2019-03-28 martijn struct dnsbl_session *session;
118 76e3b8e2 2019-03-28 martijn struct timeval timeout = {1, 0};
119 a248a3c1 2019-03-27 martijn char query[255];
120 a248a3c1 2019-03-27 martijn u_char *addr;
121 57cbfccc 2019-03-27 martijn int i, try;
123 aeda4d4e 2019-03-28 martijn if ((session = calloc(1, sizeof(*session))) == NULL)
124 b633fa4c 2019-03-29 martijn fatal(NULL);
125 aeda4d4e 2019-03-28 martijn if ((session->query = calloc(nblacklists, sizeof(*(session->query))))
126 aeda4d4e 2019-03-28 martijn == NULL)
127 b633fa4c 2019-03-29 martijn fatal(NULL);
128 aeda4d4e 2019-03-28 martijn session->reqid = reqid;
129 aeda4d4e 2019-03-28 martijn session->token = token;
130 5468729e 2019-03-29 martijn session->listed = -1;
131 c75461cd 2019-03-29 martijn RB_INSERT(dnsbl_sessions, &dnsbl_sessions, session);
133 03a6f52a 2019-03-29 martijn if (xaddr->af == AF_INET)
134 03a6f52a 2019-03-29 martijn addr = (u_char *)&(xaddr->addr);
136 03a6f52a 2019-03-29 martijn addr = (u_char *)&(xaddr->addr6);
137 a248a3c1 2019-03-27 martijn for (i = 0; i < nblacklists; i++) {
138 03a6f52a 2019-03-29 martijn if (xaddr->af == AF_INET) {
139 a248a3c1 2019-03-27 martijn if (snprintf(query, sizeof(query), "%u.%u.%u.%u.%s",
140 a248a3c1 2019-03-27 martijn addr[3], addr[2], addr[1], addr[0],
141 a248a3c1 2019-03-27 martijn blacklists[i]) >= sizeof(query))
142 b633fa4c 2019-03-29 martijn fatalx("Can't create query, domain too long");
143 03a6f52a 2019-03-29 martijn } else if (xaddr->af == AF_INET6) {
144 a248a3c1 2019-03-27 martijn if (snprintf(query, sizeof(query), "%hhx.%hhx.%hhx.%hhx"
145 a248a3c1 2019-03-27 martijn ".%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx"
146 a248a3c1 2019-03-27 martijn ".%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx"
147 a248a3c1 2019-03-27 martijn ".%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%hhx.%s",
148 a248a3c1 2019-03-27 martijn (u_char) (addr[15] & 0xf), (u_char) (addr[15] >> 4),
149 a248a3c1 2019-03-27 martijn (u_char) (addr[14] & 0xf), (u_char) (addr[14] >> 4),
150 a248a3c1 2019-03-27 martijn (u_char) (addr[13] & 0xf), (u_char) (addr[13] >> 4),
151 a248a3c1 2019-03-27 martijn (u_char) (addr[12] & 0xf), (u_char) (addr[12] >> 4),
152 a248a3c1 2019-03-27 martijn (u_char) (addr[11] & 0xf), (u_char) (addr[11] >> 4),
153 a248a3c1 2019-03-27 martijn (u_char) (addr[10] & 0xf), (u_char) (addr[10] >> 4),
154 a248a3c1 2019-03-27 martijn (u_char) (addr[9] & 0xf), (u_char) (addr[9] >> 4),
155 a248a3c1 2019-03-27 martijn (u_char) (addr[8] & 0xf), (u_char) (addr[8] >> 4),
156 a248a3c1 2019-03-27 martijn (u_char) (addr[7] & 0xf), (u_char) (addr[8] >> 4),
157 a248a3c1 2019-03-27 martijn (u_char) (addr[6] & 0xf), (u_char) (addr[7] >> 4),
158 a248a3c1 2019-03-27 martijn (u_char) (addr[5] & 0xf), (u_char) (addr[5] >> 4),
159 a248a3c1 2019-03-27 martijn (u_char) (addr[4] & 0xf), (u_char) (addr[4] >> 4),
160 a248a3c1 2019-03-27 martijn (u_char) (addr[3] & 0xf), (u_char) (addr[3] >> 4),
161 a248a3c1 2019-03-27 martijn (u_char) (addr[2] & 0xf), (u_char) (addr[2] >> 4),
162 a248a3c1 2019-03-27 martijn (u_char) (addr[1] & 0xf), (u_char) (addr[1] >> 4),
163 a248a3c1 2019-03-27 martijn (u_char) (addr[0] & 0xf), (u_char) (addr[0] >> 4),
164 a248a3c1 2019-03-27 martijn blacklists[i]) >= sizeof(query))
165 b633fa4c 2019-03-29 martijn fatalx( "Can't create query, domain too long");
167 b633fa4c 2019-03-29 martijn fatalx("Invalid address family received");
169 aeda4d4e 2019-03-28 martijn session->query[i].query = gethostbyname_async(query, NULL);
170 aeda4d4e 2019-03-28 martijn session->query[i].event = event_asr_run(session->query[i].query,
171 aeda4d4e 2019-03-28 martijn dnsbl_resolve, &(session->query[i]));
172 aeda4d4e 2019-03-28 martijn session->query[i].blacklist = i;
173 aeda4d4e 2019-03-28 martijn session->query[i].session = session;
174 76e3b8e2 2019-03-28 martijn evtimer_set(&(session->query[i].timeout), dnsbl_timeout,
175 76e3b8e2 2019-03-28 martijn &(session->query[i]));
176 76e3b8e2 2019-03-28 martijn evtimer_add(&(session->query[i].timeout), &timeout);
181 aeda4d4e 2019-03-28 martijn dnsbl_resolve(struct asr_result *result, void *arg)
183 aeda4d4e 2019-03-28 martijn struct dnsbl_query *query = arg;
184 aeda4d4e 2019-03-28 martijn struct dnsbl_session *session = query->session;
185 aeda4d4e 2019-03-28 martijn int i, blacklist;
187 aeda4d4e 2019-03-28 martijn query->resolved = 1;
188 aeda4d4e 2019-03-28 martijn query->event = NULL;
189 aeda4d4e 2019-03-28 martijn query->query = NULL;
190 76e3b8e2 2019-03-28 martijn evtimer_del(&(query->timeout));
191 aeda4d4e 2019-03-28 martijn if (result->ar_hostent != NULL) {
192 5468729e 2019-03-29 martijn if (!markspam) {
193 5468729e 2019-03-29 martijn smtp_filter_disconnect(session->reqid, session->token,
194 f15f6435 2019-03-29 martijn "Listed at %s", blacklists[query->blacklist]);
195 5468729e 2019-03-29 martijn dnsbl_session_free(session);
196 5468729e 2019-03-29 martijn } else {
197 5468729e 2019-03-29 martijn dnsbl_session_query_done(session);
198 5468729e 2019-03-29 martijn session->listed = query->blacklist;
199 5468729e 2019-03-29 martijn smtp_filter_proceed(session->reqid, session->token);
203 cf6af233 2019-03-28 martijn if (result->ar_h_errno != HOST_NOT_FOUND) {
204 cf6af233 2019-03-28 martijn smtp_filter_disconnect(session->reqid, session->token,
205 76e3b8e2 2019-03-28 martijn "DNS error on %s", blacklists[query->blacklist]);
206 cf6af233 2019-03-28 martijn dnsbl_session_free(session);
210 aeda4d4e 2019-03-28 martijn for (i = 0; i < nblacklists; i++) {
211 aeda4d4e 2019-03-28 martijn if (!session->query[i].resolved)
214 aeda4d4e 2019-03-28 martijn smtp_filter_proceed(session->reqid, session->token);
215 deafb383 2019-03-29 martijn if (!markspam)
216 deafb383 2019-03-29 martijn dnsbl_session_free(session);
220 76e3b8e2 2019-03-28 martijn dnsbl_timeout(int fd, short event, void *arg)
222 76e3b8e2 2019-03-28 martijn struct dnsbl_query *query = arg;
223 76e3b8e2 2019-03-28 martijn struct dnsbl_session *session = query->session;
225 76e3b8e2 2019-03-28 martijn smtp_filter_disconnect(session->reqid, session->token,
226 76e3b8e2 2019-03-28 martijn "DNS timeout on %s", blacklists[query->blacklist]);
227 76e3b8e2 2019-03-28 martijn dnsbl_session_free(session);
231 c75461cd 2019-03-29 martijn dnsbl_disconnect(char *type, int version, struct timespec *tm, char *direction,
232 c75461cd 2019-03-29 martijn char *phase, uint64_t reqid)
234 c75461cd 2019-03-29 martijn struct dnsbl_session *session, search;
236 c75461cd 2019-03-29 martijn search.reqid = reqid;
237 c75461cd 2019-03-29 martijn if ((session = RB_FIND(dnsbl_sessions, &dnsbl_sessions, &search)) != NULL)
238 c75461cd 2019-03-29 martijn dnsbl_session_free(session);
242 5468729e 2019-03-29 martijn dnsbl_dataline(char *type, int version, struct timespec *tm, char *direction,
243 5468729e 2019-03-29 martijn char *phase, uint64_t reqid, uint64_t token, char *line)
245 5468729e 2019-03-29 martijn struct dnsbl_session *session, search;
247 5468729e 2019-03-29 martijn search.reqid = reqid;
248 5468729e 2019-03-29 martijn session = RB_FIND(dnsbl_sessions, &dnsbl_sessions, &search);
250 5468729e 2019-03-29 martijn if (session->listed != -1) {
251 5468729e 2019-03-29 martijn smtp_filter_dataline(reqid, token, "X-Spam: yes");
252 5468729e 2019-03-29 martijn smtp_filter_dataline(reqid, token, "X-Spam-DNSBL: Listed at %s",
253 5468729e 2019-03-29 martijn blacklists[session->listed]);
254 5468729e 2019-03-29 martijn session->listed = -1;
256 5468729e 2019-03-29 martijn smtp_filter_dataline(reqid, token, "%s", line);
260 5468729e 2019-03-29 martijn dnsbl_session_query_done(struct dnsbl_session *session)
264 aeda4d4e 2019-03-28 martijn for (i = 0; i < nblacklists; i++) {
265 76e3b8e2 2019-03-28 martijn if (!session->query[i].resolved) {
266 aeda4d4e 2019-03-28 martijn event_asr_abort(session->query[i].event);
267 76e3b8e2 2019-03-28 martijn evtimer_del(&(session->query[i].timeout));
273 5468729e 2019-03-29 martijn dnsbl_session_free(struct dnsbl_session *session)
275 5468729e 2019-03-29 martijn RB_REMOVE(dnsbl_sessions, &dnsbl_sessions, session);
276 5468729e 2019-03-29 martijn dnsbl_session_query_done(session);
277 aeda4d4e 2019-03-28 martijn free(session->query);
278 aeda4d4e 2019-03-28 martijn free(session);
282 c75461cd 2019-03-29 martijn dnsbl_session_cmp(struct dnsbl_session *s1, struct dnsbl_session *s2)
284 c75461cd 2019-03-29 martijn return (s1->reqid < s2->reqid ? -1 : s1->reqid > s2->reqid);
287 f8356fc3 2019-03-28 martijn __dead void
288 a248a3c1 2019-03-27 martijn usage(void)
290 deafb383 2019-03-29 martijn fprintf(stderr, "usage: %s [-m] blacklist [...]\n",
291 a248a3c1 2019-03-27 martijn getprogname());
292 a248a3c1 2019-03-27 martijn exit(1);
295 c75461cd 2019-03-29 martijn RB_GENERATE(dnsbl_sessions, dnsbl_session, entry, dnsbl_session_cmp);
