1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
|
/* $OpenBSD: forward.c,v 1.4 2008/11/25 23:06:15 gilles Exp $ */
/*
* Copyright (c) 2008 Gilles Chehade <gilles@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/tree.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <ctype.h>
#include <db.h>
#include <err.h>
#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <paths.h>
#include <pwd.h>
#include <signal.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>
#include "smtpd.h"
int alias_parse(struct alias *, char *);
int
forwards_get(struct aliaseslist *aliases, char *username)
{
FILE *fp;
struct alias alias;
struct alias *aliasp;
char pathname[MAXPATHLEN];
struct passwd *pw;
char *buf, *lbuf;
size_t len;
struct stat sb;
pw = getpwnam(username);
if (pw == NULL)
return 0;
if (snprintf(pathname, MAXPATHLEN, "%s/.forward", pw->pw_dir)
>= MAXPATHLEN)
return 0;
fp = fopen(pathname, "r");
if (fp == NULL)
return 0;
log_debug("+ opening forward file %s", pathname);
/* make sure ~/ is not writable by anyone but owner */
if (stat(pw->pw_dir, &sb) == -1)
goto bad;
if (sb.st_uid != pw->pw_uid || sb.st_mode & (S_IWGRP|S_IWOTH))
goto bad;
/* make sure ~/.forward is not writable by anyone but owner */
if (fstat(fileno(fp), &sb) == -1)
goto bad;
if (sb.st_uid != pw->pw_uid || sb.st_mode & (S_IWGRP|S_IWOTH))
goto bad;
lbuf = NULL;
while ((buf = fgetln(fp, &len))) {
if (buf[len - 1] == '\n')
buf[len - 1] = '\0';
else {
/* EOF without EOL, copy and add the NUL */
if ((lbuf = malloc(len + 1)) == NULL)
fatal("malloc");
memcpy(lbuf, buf, len);
lbuf[len] = '\0';
buf = lbuf;
}
log_debug("\tforward: %s", buf);
if (! alias_parse(&alias, buf)) {
log_debug("bad entry in ~/.forward");
continue;
}
if (alias.type == ALIAS_INCLUDE) {
log_debug("includes are forbidden in ~/.forward");
continue;
}
aliasp = calloc(1, sizeof(struct alias));
if (aliasp == NULL)
fatal("calloc");
*aliasp = alias;
TAILQ_INSERT_HEAD(aliases, aliasp, entry);
}
free(lbuf);
fclose(fp);
return 1;
bad:
log_debug("+ forward file error, probably bad perms/mode");
if (fp != NULL)
fclose(fp);
return 0;
}
|
