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contrib/dhcpcd/src/privsep-bsd.c

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/* SPDX-License-Identifier: BSD-2-Clause */
/*
* Privilege Separation for dhcpcd, BSD driver
* Copyright (c) 2006-2021 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 <arpa/inet.h>
#include <net/if.h>
#include <netinet/if_ether.h>
#include <netinet/in.h>
#include <netinet6/in6_var.h>
#include <netinet6/nd6.h>
#ifdef __NetBSD__
#include <netinet/if_ether.h>
#include <net/if_vlanvar.h> /* Needs netinet/if_ether.h */
#elif defined(__DragonFly__)
#include <net/vlan/if_vlan_var.h>
#else
#include <net/if_vlan_var.h>
#endif
#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