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
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
|
/* $OpenLDAP$ */
/* This work is part of OpenLDAP Software <http://www.openldap.org/>.
*
* Copyright 2000-2022 The OpenLDAP Foundation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted only as authorized by the OpenLDAP
* Public License.
*
* A copy of this license is available in the file LICENSE in the
* top-level directory of the distribution or, alternatively, at
* <http://www.OpenLDAP.org/license.html>.
*/
#include "portable.h"
#include "slap.h"
#ifdef HAVE_STDINT_H
#include <stdint.h>
#endif
#ifdef HAVE_INTTYPES_H
#include <inttypes.h>
#endif
#include <lber_types.h>
#include <ac/string.h>
#include <ac/errno.h>
typedef struct {
uint8_t sig[12]; /* hex 0d 0a 0d 0a 00 0d 0a 51 55 49 54 0a */
uint8_t ver_cmd; /* protocol version and command */
uint8_t fam; /* protocol family and address */
uint16_t len; /* length of address data */
} proxyp_header;
typedef union {
struct { /* for TCP/UDP over IPv4, len = 12 */
uint32_t src_addr;
uint32_t dst_addr;
uint16_t src_port;
uint16_t dst_port;
} ip4;
struct { /* for TCP/UDP over IPv6, len = 36 */
uint8_t src_addr[16];
uint8_t dst_addr[16];
uint16_t src_port;
uint16_t dst_port;
} ip6;
struct { /* for AF_UNIX sockets, len = 216 */
uint8_t src_addr[108];
uint8_t dst_addr[108];
} unx;
} proxyp_addr;
static const uint8_t proxyp_sig[12] = {
0x0d, 0x0a, 0x0d, 0x0a, 0x00, 0x0d, 0x0a, 0x51, 0x55, 0x49, 0x54, 0x0a,
};
int
proxyp( ber_socket_t sfd, Sockaddr *from ) {
proxyp_header pph;
proxyp_addr ppa;
char peername[LDAP_IPADDRLEN];
struct berval peerbv = BER_BVC(peername);
/* Maximum size of header minus static component size is max option size */
uint8_t proxyp_options[536 - 16];
int pph_len;
int ret;
peername[0] = '\0';
do {
ret = tcp_read( SLAP_FD2SOCK( sfd ), &pph, sizeof(pph) );
} while ( ret == -1 && errno == EINTR );
if ( ret == -1 ) {
char ebuf[128];
int save_errno = errno;
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"header read failed %d (%s)\n",
(long)sfd, save_errno,
AC_STRERROR_R( save_errno, ebuf, sizeof(ebuf) ) );
return 0;
} else if ( ret != sizeof(pph) ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"header read insufficient data %d\n",
(long)sfd, ret );
return 0;
}
if ( memcmp( pph.sig, proxyp_sig, 12 ) != 0 ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"invalid header signature\n", (long)sfd );
return 0;
}
if ( ( pph.ver_cmd & 0xF0 ) != 0x20 ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"invalid header version %x\n",
(long)sfd, pph.ver_cmd & 0xF0 );
return 0;
}
pph_len = ntohs( pph.len );
if ( ( pph.ver_cmd & 0x0F ) == 0x01 ) { /* PROXY command */
int addr_len;
switch ( pph.fam ) {
case 0x11: /* TCPv4 */
addr_len = sizeof( ppa.ip4 );
break;
case 0x21: /* TCPv6 */
addr_len = sizeof( ppa.ip6 );
break;
default:
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"unsupported protocol %x\n",
(long)sfd, pph.fam );
return 0;
}
if ( pph_len < addr_len ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"address length %d too small, expecting %d\n",
(long)sfd, pph_len, addr_len );
return 0;
}
do {
ret = tcp_read( SLAP_FD2SOCK (sfd), &ppa, addr_len );
} while ( ret == -1 && errno == EINTR );
if ( ret == -1 ) {
char ebuf[128];
int save_errno = errno;
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"address read failed %d (%s)\n",
(long)sfd, save_errno,
AC_STRERROR_R( save_errno, ebuf, sizeof(ebuf) ) );
return 0;
} else if ( ret != addr_len ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"address read insufficient data, expecting %d, read %d\n",
(long)sfd, addr_len, ret );
return 0;
}
pph_len -= addr_len;
}
switch ( pph.ver_cmd & 0x0F ) {
case 0x01: /* PROXY command */
switch ( pph.fam ) {
case 0x11: /* TCPv4 */
ldap_pvt_sockaddrstr( from, &peerbv );
Debug( LDAP_DEBUG_STATS, "proxyp(%ld): via %s\n",
(long)sfd, peername );
from->sa_in_addr.sin_family = AF_INET;
from->sa_in_addr.sin_addr.s_addr = ppa.ip4.src_addr;
from->sa_in_addr.sin_port = ppa.ip4.src_port;
break;
case 0x21: /* TCPv6 */
#ifdef LDAP_PF_INET6
ldap_pvt_sockaddrstr( from, &peerbv );
Debug( LDAP_DEBUG_STATS, "proxyp(%ld): via %s\n",
(long)sfd, peername );
from->sa_in6_addr.sin6_family = AF_INET6;
memcpy( &from->sa_in6_addr.sin6_addr, ppa.ip6.src_addr,
sizeof(ppa.ip6.src_addr) );
from->sa_in6_addr.sin6_port = ppa.ip6.src_port;
#else
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"IPv6 proxied addresses disabled\n",
(long)sfd );
return 0;
#endif
break;
}
break;
case 0x00: /* LOCAL command */
Debug( LDAP_DEBUG_CONNS, "proxyp(%ld): "
"local connection, ignoring proxy data\n",
(long)sfd );
break;
default:
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): invalid command %x\n",
(long)sfd, pph.ver_cmd & 0x0F );
return 0;
}
/* Clear out any options left in proxy packet */
if ( pph_len > 0 ) {
if (pph_len > sizeof( proxyp_options ) ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"options size %d too big\n",
(long)sfd, pph_len );
return 0;
}
do {
ret = tcp_read( SLAP_FD2SOCK (sfd), &proxyp_options, pph_len );
} while ( ret == -1 && errno == EINTR );
if ( ret == -1 ) {
char ebuf[128];
int save_errno = errno;
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"options read failed %d (%s)\n",
(long)sfd, save_errno,
AC_STRERROR_R( save_errno, ebuf, sizeof(ebuf) ) );
return 0;
} else if ( ret != pph_len ) {
Debug( LDAP_DEBUG_ANY, "proxyp(%ld): "
"options read insufficient data, expecting %d, read %d\n",
(long)sfd, pph_len, ret );
return 0;
}
}
return 1;
}
|
