1 |
|
|
/* $OpenBSD: ruleset.c,v 1.34 2017/02/13 12:23:47 gilles Exp $ */ |
2 |
|
|
|
3 |
|
|
/* |
4 |
|
|
* Copyright (c) 2009 Gilles Chehade <gilles@poolp.org> |
5 |
|
|
* |
6 |
|
|
* Permission to use, copy, modify, and distribute this software for any |
7 |
|
|
* purpose with or without fee is hereby granted, provided that the above |
8 |
|
|
* copyright notice and this permission notice appear in all copies. |
9 |
|
|
* |
10 |
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 |
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
12 |
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
13 |
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
14 |
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
15 |
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
16 |
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
17 |
|
|
*/ |
18 |
|
|
|
19 |
|
|
#include <sys/types.h> |
20 |
|
|
#include <sys/queue.h> |
21 |
|
|
#include <sys/tree.h> |
22 |
|
|
#include <sys/socket.h> |
23 |
|
|
|
24 |
|
|
#include <netinet/in.h> |
25 |
|
|
|
26 |
|
|
#include <errno.h> |
27 |
|
|
#include <event.h> |
28 |
|
|
#include <imsg.h> |
29 |
|
|
#include <stdio.h> |
30 |
|
|
#include <string.h> |
31 |
|
|
#include <limits.h> |
32 |
|
|
|
33 |
|
|
#include "smtpd.h" |
34 |
|
|
#include "log.h" |
35 |
|
|
|
36 |
|
|
|
37 |
|
|
static int ruleset_check_source(struct table *, |
38 |
|
|
const struct sockaddr_storage *, int); |
39 |
|
|
static int ruleset_check_mailaddr(struct table *, const struct mailaddr *); |
40 |
|
|
|
41 |
|
|
struct rule * |
42 |
|
|
ruleset_match(const struct envelope *evp) |
43 |
|
|
{ |
44 |
|
|
const struct mailaddr *maddr = &evp->dest; |
45 |
|
|
const struct sockaddr_storage *ss = &evp->ss; |
46 |
|
|
struct rule *r; |
47 |
|
|
int ret; |
48 |
|
|
|
49 |
|
|
TAILQ_FOREACH(r, env->sc_rules, r_entry) { |
50 |
|
|
|
51 |
|
|
if (r->r_tag[0] != '\0') { |
52 |
|
|
ret = strcmp(r->r_tag, evp->tag); |
53 |
|
|
if (ret != 0 && !r->r_nottag) |
54 |
|
|
continue; |
55 |
|
|
if (ret == 0 && r->r_nottag) |
56 |
|
|
continue; |
57 |
|
|
} |
58 |
|
|
|
59 |
|
|
if ((r->r_wantauth && !r->r_negwantauth) && !(evp->flags & EF_AUTHENTICATED)) |
60 |
|
|
continue; |
61 |
|
|
if ((r->r_wantauth && r->r_negwantauth) && (evp->flags & EF_AUTHENTICATED)) |
62 |
|
|
continue; |
63 |
|
|
|
64 |
|
|
ret = ruleset_check_source(r->r_sources, ss, evp->flags); |
65 |
|
|
if (ret == -1) { |
66 |
|
|
errno = EAGAIN; |
67 |
|
|
return (NULL); |
68 |
|
|
} |
69 |
|
|
if ((ret == 0 && !r->r_notsources) || (ret != 0 && r->r_notsources)) |
70 |
|
|
continue; |
71 |
|
|
|
72 |
|
|
if (r->r_senders) { |
73 |
|
|
ret = ruleset_check_mailaddr(r->r_senders, &evp->sender); |
74 |
|
|
if (ret == -1) { |
75 |
|
|
errno = EAGAIN; |
76 |
|
|
return (NULL); |
77 |
|
|
} |
78 |
|
|
if ((ret == 0 && !r->r_notsenders) || (ret != 0 && r->r_notsenders)) |
79 |
|
|
continue; |
80 |
|
|
} |
81 |
|
|
|
82 |
|
|
if (r->r_recipients) { |
83 |
|
|
ret = ruleset_check_mailaddr(r->r_recipients, &evp->dest); |
84 |
|
|
if (ret == -1) { |
85 |
|
|
errno = EAGAIN; |
86 |
|
|
return (NULL); |
87 |
|
|
} |
88 |
|
|
if ((ret == 0 && !r->r_notrecipients) || (ret != 0 && r->r_notrecipients)) |
89 |
|
|
continue; |
90 |
|
|
} |
91 |
|
|
|
92 |
|
|
ret = r->r_destination == NULL ? 1 : |
93 |
|
|
table_lookup(r->r_destination, NULL, maddr->domain, K_DOMAIN, |
94 |
|
|
NULL); |
95 |
|
|
if (ret == -1) { |
96 |
|
|
errno = EAGAIN; |
97 |
|
|
return NULL; |
98 |
|
|
} |
99 |
|
|
if ((ret == 0 && !r->r_notdestination) || (ret != 0 && r->r_notdestination)) |
100 |
|
|
continue; |
101 |
|
|
|
102 |
|
|
goto matched; |
103 |
|
|
} |
104 |
|
|
|
105 |
|
|
errno = 0; |
106 |
|
|
log_trace(TRACE_RULES, "no rule matched"); |
107 |
|
|
return (NULL); |
108 |
|
|
|
109 |
|
|
matched: |
110 |
|
|
log_trace(TRACE_RULES, "rule matched: %s", rule_to_text(r)); |
111 |
|
|
return r; |
112 |
|
|
} |
113 |
|
|
|
114 |
|
|
static int |
115 |
|
|
ruleset_check_source(struct table *table, const struct sockaddr_storage *ss, |
116 |
|
|
int evpflags) |
117 |
|
|
{ |
118 |
|
|
const char *key; |
119 |
|
|
|
120 |
|
|
if (evpflags & (EF_AUTHENTICATED | EF_INTERNAL)) |
121 |
|
|
key = "local"; |
122 |
|
|
else |
123 |
|
|
key = ss_to_text(ss); |
124 |
|
|
switch (table_lookup(table, NULL, key, K_NETADDR, NULL)) { |
125 |
|
|
case 1: |
126 |
|
|
return 1; |
127 |
|
|
case -1: |
128 |
|
|
log_warnx("warn: failure to perform a table lookup on table %s", |
129 |
|
|
table->t_name); |
130 |
|
|
return -1; |
131 |
|
|
default: |
132 |
|
|
break; |
133 |
|
|
} |
134 |
|
|
|
135 |
|
|
return 0; |
136 |
|
|
} |
137 |
|
|
|
138 |
|
|
static int |
139 |
|
|
ruleset_check_mailaddr(struct table *table, const struct mailaddr *maddr) |
140 |
|
|
{ |
141 |
|
|
const char *key; |
142 |
|
|
|
143 |
|
|
key = mailaddr_to_text(maddr); |
144 |
|
|
if (key == NULL) |
145 |
|
|
return -1; |
146 |
|
|
|
147 |
|
|
switch (table_lookup(table, NULL, key, K_MAILADDR, NULL)) { |
148 |
|
|
case 1: |
149 |
|
|
return 1; |
150 |
|
|
case -1: |
151 |
|
|
log_warnx("warn: failure to perform a table lookup on table %s", |
152 |
|
|
table->t_name); |
153 |
|
|
return -1; |
154 |
|
|
default: |
155 |
|
|
break; |
156 |
|
|
} |
157 |
|
|
return 0; |
158 |
|
|
} |