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
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
|
/* $OpenBSD: virtual.c,v 1.6 2004/06/20 05:18:07 itojun Exp $ */
/*
* Virtual domain support.
*/
#include "params.h"
#if POP_VIRTUAL
#define _XOPEN_SOURCE 4
#define _XOPEN_SOURCE_EXTENDED
#define _XOPEN_VERSION 4
#define _XPG4_2
#include <stdio.h>
#include <unistd.h>
#include <fcntl.h>
#include <string.h>
#include <stdlib.h>
#include <limits.h>
#include <errno.h>
#include <pwd.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifndef NAME_MAX
#define NAME_MAX 255
#endif
extern int log_error(char *s);
char *virtual_domain;
char *virtual_spool;
int virtual_startup(void)
{
return 0;
}
static char *lookup(void)
{
struct sockaddr_storage ss;
int length;
int error;
static char hbuf[NI_MAXHOST];
length = sizeof(ss);
if (getsockname(0, (struct sockaddr *)&ss, &length)) {
if (errno == ENOTSOCK) return "";
log_error("getsockname");
return NULL;
}
error = getnameinfo((struct sockaddr *)&ss, length, hbuf, sizeof(hbuf),
NULL, 0, NI_NUMERICHOST);
if (error) {
/* logging? */
return NULL;
}
return hbuf;
}
static int is_valid_user(char *user)
{
unsigned char *p;
/* This is pretty liberal, but we're going to use direct syscalls only,
* and they have to accept all the printable characters */
for (p = (unsigned char *)user; *p; p++)
if (*p < ' ' || *p > 0x7E || *p == '.' || *p == '/') return 0;
if (p - (unsigned char *)user > NAME_MAX) return 0;
return 1;
}
struct passwd *virtual_userpass(char *user, char *pass, int *known)
{
struct passwd *pw, *result;
struct stat stat;
char auth[VIRTUAL_AUTH_SIZE];
char *address, *pathname;
char *template, *passwd;
int fail;
int fd, size;
*known = 0;
/* Make sure we don't try to authenticate globally if something fails
* before we find out whether the virtual domain is known to us */
virtual_domain = "UNKNOWN";
virtual_spool = NULL;
if (!(address = lookup())) return NULL;
/* Authenticate globally (if supported) if run on a non-socket */
if (!*address) {
virtual_domain = NULL;
return NULL;
}
fail = 0;
if (!is_valid_user(user)) {
user = "INVALID";
fail = 1;
}
/* This "can't happen", but is just too critical to not check explicitly */
if (strchr(address, '/') || strchr(user, '/'))
return NULL;
if (asprintf(&pathname, "%s/%s", VIRTUAL_HOME_PATH, address) == -1)
return NULL;
if (lstat(pathname, &stat)) {
if (errno == ENOENT)
virtual_domain = NULL;
else
log_error("lstat");
free(pathname);
return NULL;
}
if (!(address = strdup(address))) {
free(pathname);
return NULL;
}
virtual_domain = address;
free(pathname);
if (asprintf(&pathname, "%s/%s/%s/%s", VIRTUAL_HOME_PATH, address,
VIRTUAL_AUTH_PATH, user) == -1)
return NULL;
if ((fd = open(pathname, O_RDONLY)) < 0 && errno != ENOENT) {
log_error("open");
fail = 1;
}
free(pathname);
if (asprintf(&virtual_spool, "%s/%s/%s", VIRTUAL_HOME_PATH,
virtual_domain, VIRTUAL_SPOOL_PATH) == -1) {
close(fd);
return NULL;
}
size = 0;
if (fd >= 0) {
*known = !fail;
if ((size = read(fd, auth, sizeof(auth))) < 0) {
log_error("read");
size = 0;
fail = 1;
}
close(fd);
}
if (size >= sizeof(auth)) {
size = 0;
fail = 1;
}
auth[size] = 0;
if (!(template = strtok(auth, ":")) || !*template) {
template = "INVALID";
fail = 1;
}
if (!(passwd = strtok(NULL, ":")) || !*passwd ||
*passwd == '*' || *passwd == '!') {
passwd = AUTH_DUMMY_SALT;
fail = 1;
}
if (!strtok(NULL, ":")) fail = 1;
if ((pw = getpwnam(template)))
memset(pw->pw_passwd, 0, strlen(pw->pw_passwd));
endpwent();
result = NULL;
if (!strcmp(crypt(pass, passwd), passwd) && !fail)
result = pw;
memset(auth, 0, sizeof(auth));
return result;
}
#endif
|
