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
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
|
/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Privilege Separation for dhcpcd, BSD driver
* Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
* All rights reserved
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/ioctl.h>
/* Need these for filtering the ioctls */
#include <net/if.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#ifdef __DragonFly__
# include <netproto/802_11/ieee80211_ioctl.h>
#else
# include <net80211/ieee80211.h>
# include <net80211/ieee80211_ioctl.h>
#endif
#include <errno.h>
#include <string.h>
#include <unistd.h>
#include "dhcpcd.h"
#include "logerr.h"
#include "privsep.h"
static ssize_t
ps_root_doioctldom(int domain, unsigned long req, void *data, size_t len)
{
int s, err;
/* Only allow these ioctls */
switch(req) {
#ifdef SIOCGIFDATA
case SIOCGIFDATA: /* FALLTHROUGH */
#endif
#ifdef SIOCG80211NWID
case SIOCG80211NWID: /* FALLTHROUGH */
#endif
#ifdef SIOCGETVLAN
case SIOCGETVLAN: /* FALLTHROUGH */
#endif
#ifdef SIOCIFAFATTACH
case SIOCIFAFATTACH: /* FALLTHROUGH */
#endif
#ifdef SIOCSIFXFLAGS
case SIOCSIFXFLAGS: /* FALLTHROUGH */
#endif
#ifdef SIOCSIFINFO_FLAGS
case SIOCSIFINFO_FLAGS: /* FALLTHROUGH */
#endif
#ifdef SIOCSRTRFLUSH_IN6
case SIOCSRTRFLUSH_IN6: /* FALLTHROUGH */
case SIOCSPFXFLUSH_IN6: /* FALLTHROUGH */
#endif
#if defined(SIOCALIFADDR) && defined(IFLR_ACTIVE)
case SIOCALIFADDR: /* FALLTHROUGH */
case SIOCDLIFADDR: /* FALLTHROUGH */
#else
case SIOCSIFLLADDR: /* FALLTHROUGH */
#endif
#ifdef SIOCSIFINFO_IN6
case SIOCSIFINFO_IN6: /* FALLTHROUGH */
#endif
case SIOCAIFADDR_IN6: /* FALLTHROUGH */
case SIOCDIFADDR_IN6:
break;
default:
errno = EPERM;
return -1;
}
s = socket(domain, SOCK_DGRAM, 0);
if (s == -1)
return -1;
err = ioctl(s, req, data, len);
close(s);
return err;
}
static ssize_t
ps_root_doroute(void *data, size_t len)
{
int s;
ssize_t err;
s = socket(PF_ROUTE, SOCK_RAW, 0);
if (s != -1)
err = write(s, data, len);
else
err = -1;
if (s != -1)
close(s);
return err;
}
#if defined(HAVE_CAPSICUM) || defined(HAVE_PLEDGE)
static ssize_t
ps_root_doindirectioctl(unsigned long req, void *data, size_t len)
{
char *p = data;
struct ifreq ifr = { .ifr_flags = 0 };
/* ioctl filtering is done in ps_root_doioctldom */
if (len < IFNAMSIZ + 1) {
errno = EINVAL;
return -1;
}
strlcpy(ifr.ifr_name, p, IFNAMSIZ);
len -= IFNAMSIZ;
memmove(data, p + IFNAMSIZ, len);
ifr.ifr_data = data;
return ps_root_doioctldom(PF_INET, req, &ifr, sizeof(ifr));
}
#endif
#ifdef HAVE_PLEDGE
static ssize_t
ps_root_doifignoregroup(void *data, size_t len)
{
int s, err;
if (len == 0 || ((const char *)data)[len - 1] != '\0') {
errno = EINVAL;
return -1;
}
s = socket(PF_INET, SOCK_DGRAM, 0);
if (s == -1)
return -1;
err = if_ignoregroup(s, data);
close(s);
return err;
}
#endif
ssize_t
ps_root_os(struct ps_msghdr *psm, struct msghdr *msg,
void **rdata, size_t *rlen)
{
struct iovec *iov = msg->msg_iov;
void *data = iov->iov_base;
size_t len = iov->iov_len;
ssize_t err;
switch (psm->ps_cmd) {
case PS_IOCTLLINK:
err = ps_root_doioctldom(PF_LINK, psm->ps_flags, data, len);
break;
case PS_IOCTL6:
err = ps_root_doioctldom(PF_INET6, psm->ps_flags, data, len);
break;
case PS_ROUTE:
return ps_root_doroute(data, len);
#if defined(HAVE_CAPSICUM) || defined(HAVE_PLEDGE)
case PS_IOCTLINDIRECT:
err = ps_root_doindirectioctl(psm->ps_flags, data, len);
break;
#endif
#ifdef HAVE_PLEDGE
case PS_IFIGNOREGRP:
return ps_root_doifignoregroup(data, len);
#endif
default:
errno = ENOTSUP;
return -1;
}
if (err != -1) {
*rdata = data;
*rlen = len;
}
return err;
}
static ssize_t
ps_root_ioctldom(struct dhcpcd_ctx *ctx, uint16_t domain, unsigned long request,
void *data, size_t len)
{
if (ps_sendcmd(ctx, ctx->ps_root_fd, domain,
request, data, len) == -1)
return -1;
return ps_root_readerror(ctx, data, len);
}
ssize_t
ps_root_ioctllink(struct dhcpcd_ctx *ctx, unsigned long request,
void *data, size_t len)
{
return ps_root_ioctldom(ctx, PS_IOCTLLINK, request, data, len);
}
ssize_t
ps_root_ioctl6(struct dhcpcd_ctx *ctx, unsigned long request,
void *data, size_t len)
{
return ps_root_ioctldom(ctx, PS_IOCTL6, request, data, len);
}
ssize_t
ps_root_route(struct dhcpcd_ctx *ctx, void *data, size_t len)
{
if (ps_sendcmd(ctx, ctx->ps_root_fd, PS_ROUTE, 0, data, len) == -1)
return -1;
return ps_root_readerror(ctx, data, len);
}
#if defined(HAVE_CAPSICUM) || defined(HAVE_PLEDGE)
ssize_t
ps_root_indirectioctl(struct dhcpcd_ctx *ctx, unsigned long request,
const char *ifname, void *data, size_t len)
{
char buf[PS_BUFLEN];
if (IFNAMSIZ + len > sizeof(buf)) {
errno = ENOBUFS;
return -1;
}
strlcpy(buf, ifname, IFNAMSIZ);
memcpy(buf + IFNAMSIZ, data, len);
if (ps_sendcmd(ctx, ctx->ps_root_fd, PS_IOCTLINDIRECT,
request, buf, IFNAMSIZ + len) == -1)
return -1;
return ps_root_readerror(ctx, data, len);
}
ssize_t
ps_root_ifignoregroup(struct dhcpcd_ctx *ctx, const char *ifname)
{
if (ps_sendcmd(ctx, ctx->ps_root_fd, PS_IFIGNOREGRP, 0,
ifname, strlen(ifname) + 1) == -1)
return -1;
return ps_root_readerror(ctx, NULL, 0);
}
#endif
|
