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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.sbin/ftp-proxy/filter.c	Lines:	0	117	0.0 %
Date:	2017-11-07	Branches:	0	50	0.0 %


/*	$OpenBSD: filter.c,v 1.21 2015/01/21 21:50:33 deraadt Exp $ */

/*
 * Copyright (c) 2004, 2005 Camiel Dobbelaar, <cd@sentia.nl>
 *
 * 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/ioctl.h>
#include <sys/types.h>
#include <sys/socket.h>

#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/pfvar.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

#include "filter.h"

/* From netinet/in.h, but only _KERNEL_ gets them. */
#define satosin(sa)	((struct sockaddr_in *)(sa))
#define satosin6(sa)	((struct sockaddr_in6 *)(sa))

int add_addr(struct sockaddr *, struct pf_pool *);
int prepare_rule(u_int32_t, struct sockaddr *, struct sockaddr *,
    u_int16_t);

static struct pfioc_rule	pfr;
static struct pfioc_trans	pft;
static struct pfioc_trans_e	pfte;
static int dev, rule_log;
static char *qname, *tagname;

int
add_addr(struct sockaddr *addr, struct pf_pool *pfp)
{
	if (addr->sa_family == AF_INET) {
		memcpy(&pfp->addr.v.a.addr.v4,
		    &satosin(addr)->sin_addr.s_addr, 4);
		memset(&pfp->addr.v.a.mask.addr8, 255, 4);
	} else {
		memcpy(&pfp->addr.v.a.addr.v6,
		    &satosin6(addr)->sin6_addr.s6_addr, 16);
		memset(&pfp->addr.v.a.mask.addr8, 255, 16);
	}
	pfp->addr.type = PF_ADDR_ADDRMASK;
	return (0);
}

int
add_nat(u_int32_t id, struct sockaddr *src, int s_rd, struct sockaddr *dst,
    u_int16_t d_port, struct sockaddr *nat, u_int16_t nat_range_low,
    u_int16_t nat_range_high)
{
	if (!src || !dst || !d_port || !nat || !nat_range_low ||
	    !nat_range_high || (src->sa_family != nat->sa_family)) {
		errno = EINVAL;
		return (-1);
	}

	if (prepare_rule(id, src, dst, d_port) == -1)
		return (-1);

	if (add_addr(nat, &pfr.rule.nat) == -1)
		return (-1);

	pfr.rule.direction = PF_OUT;
	pfr.rule.onrdomain = s_rd;
	pfr.rule.rtableid = -1;
	pfr.rule.nat.proxy_port[0] = nat_range_low;
	pfr.rule.nat.proxy_port[1] = nat_range_high;
	if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
		return (-1);

	return (0);
}

int
add_rdr(u_int32_t id, struct sockaddr *src, int s_rd, struct sockaddr *dst,
    u_int16_t d_port, struct sockaddr *rdr, u_int16_t rdr_port, int d_rd)
{
	if (!src || !dst || !d_port || !rdr || !rdr_port ||
	    (src->sa_family != rdr->sa_family)) {
		errno = EINVAL;
		return (-1);
	}

	if (prepare_rule(id, src, dst, d_port) == -1)
		return (-1);

	if (add_addr(rdr, &pfr.rule.rdr) == -1)
		return (-1);

	pfr.rule.direction = PF_IN;
	pfr.rule.onrdomain = s_rd;
	pfr.rule.rtableid = d_rd;
	pfr.rule.rdr.proxy_port[0] = rdr_port;
	if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
		return (-1);

	return (0);
}

int
do_commit(void)
{
	if (ioctl(dev, DIOCXCOMMIT, &pft) == -1)
		return (-1);

	return (0);
}

int
do_rollback(void)
{
	if (ioctl(dev, DIOCXROLLBACK, &pft) == -1)
		return (-1);

	return (0);
}

void
init_filter(char *opt_qname, char *opt_tagname, int opt_verbose)
{
	struct pf_status status;

	qname = opt_qname;
	tagname = opt_tagname;

	if (opt_verbose == 1)
		rule_log = PF_LOG;
	else if (opt_verbose == 2)
		rule_log = PF_LOG_ALL;

	dev = open("/dev/pf", O_RDWR);
	if (dev == -1)
		err(1, "open /dev/pf");
	if (ioctl(dev, DIOCGETSTATUS, &status) == -1)
		err(1, "DIOCGETSTATUS");
	if (!status.running)
		errx(1, "pf is disabled");
}

int
prepare_commit(u_int32_t id)
{
	char an[PF_ANCHOR_NAME_SIZE];

	memset(&pft, 0, sizeof pft);
	pft.size = 1;
	pft.esize = sizeof pfte;
	pft.array = &pfte;

	snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
	    getpid(), id);
	memset(&pfte, 0, sizeof pfte);
	strlcpy(pfte.anchor, an, PF_ANCHOR_NAME_SIZE);
	pfte.type = PF_TRANS_RULESET;

	if (ioctl(dev, DIOCXBEGIN, &pft) == -1)
		return (-1);

	return (0);
}

int
prepare_rule(u_int32_t id, struct sockaddr *src,
    struct sockaddr *dst, u_int16_t d_port)
{
	char an[PF_ANCHOR_NAME_SIZE];

	if ((src->sa_family != AF_INET && src->sa_family != AF_INET6) ||
	    (src->sa_family != dst->sa_family)) {
		errno = EPROTONOSUPPORT;
		return (-1);
	}

	memset(&pfr, 0, sizeof pfr);
	snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
	    getpid(), id);
	strlcpy(pfr.anchor, an, PF_ANCHOR_NAME_SIZE);

	pfr.ticket = pfte.ticket;

	/* Generic for all rule types. */
	pfr.rule.af = src->sa_family;
	pfr.rule.proto = IPPROTO_TCP;
	pfr.rule.src.addr.type = PF_ADDR_ADDRMASK;
	pfr.rule.dst.addr.type = PF_ADDR_ADDRMASK;
	pfr.rule.nat.addr.type = PF_ADDR_NONE;
	pfr.rule.rdr.addr.type = PF_ADDR_NONE;

	if (src->sa_family == AF_INET) {
		memcpy(&pfr.rule.src.addr.v.a.addr.v4,
		    &satosin(src)->sin_addr.s_addr, 4);
		memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 4);
		memcpy(&pfr.rule.dst.addr.v.a.addr.v4,
		    &satosin(dst)->sin_addr.s_addr, 4);
		memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 4);
	} else {
		memcpy(&pfr.rule.src.addr.v.a.addr.v6,
		    &satosin6(src)->sin6_addr.s6_addr, 16);
		memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 16);
		memcpy(&pfr.rule.dst.addr.v.a.addr.v6,
		    &satosin6(dst)->sin6_addr.s6_addr, 16);
		memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 16);
	}
	pfr.rule.dst.port_op = PF_OP_EQ;
	pfr.rule.dst.port[0] = htons(d_port);

	/*
	 * pass [quick] [log] inet[6] proto tcp \
	 *     from $src to $dst port = $d_port flags S/SA keep state
	 *     (max 1) [queue qname] [tag tagname]
	 */
	if (tagname != NULL)
		pfr.rule.action = PF_MATCH;
	else
		pfr.rule.action = PF_PASS;
	pfr.rule.quick = 1;
	pfr.rule.log = rule_log;
	pfr.rule.keep_state = 1;
	pfr.rule.flags = TH_SYN;
	pfr.rule.flagset = (TH_SYN|TH_ACK);
	pfr.rule.max_states = 1;
	if (qname != NULL)
		strlcpy(pfr.rule.qname, qname, sizeof pfr.rule.qname);
	if (tagname != NULL) {
		pfr.rule.quick = 0;
		strlcpy(pfr.rule.tagname, tagname,
                               sizeof pfr.rule.tagname);
	}

	return (0);
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: filter.c,v 1.21 2015/01/21 21:50:33 deraadt Exp $ */
2
3			/*
4			* Copyright (c) 2004, 2005 Camiel Dobbelaar, <cd@sentia.nl>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
15			* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
16			* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/ioctl.h>
20			#include <sys/types.h>
21			#include <sys/socket.h>
22
23			#include <netinet/in.h>
24			#include <netinet/tcp.h>
25			#include <arpa/inet.h>
26			#include <net/if.h>
27			#include <net/pfvar.h>
28
29			#include <err.h>
30			#include <errno.h>
31			#include <fcntl.h>
32			#include <stdio.h>
33			#include <string.h>
34			#include <unistd.h>
35
36			#include "filter.h"
37
38			/* From netinet/in.h, but only _KERNEL_ gets them. */
39			#define satosin(sa) ((struct sockaddr_in *)(sa))
40			#define satosin6(sa) ((struct sockaddr_in6 *)(sa))
41
42			int add_addr(struct sockaddr , struct pf_pool );
43			int prepare_rule(u_int32_t, struct sockaddr , struct sockaddr ,
44			u_int16_t);
45
46			static struct pfioc_rule pfr;
47			static struct pfioc_trans pft;
48			static struct pfioc_trans_e pfte;
49			static int dev, rule_log;
50			static char qname, tagname;
51
52			int
53			add_addr(struct sockaddr addr, struct pf_pool pfp)
54			{
55			if (addr->sa_family == AF_INET) {
56			memcpy(&pfp->addr.v.a.addr.v4,
57			&satosin(addr)->sin_addr.s_addr, 4);
58			memset(&pfp->addr.v.a.mask.addr8, 255, 4);
59			} else {
60			memcpy(&pfp->addr.v.a.addr.v6,
61			&satosin6(addr)->sin6_addr.s6_addr, 16);
62			memset(&pfp->addr.v.a.mask.addr8, 255, 16);
63			}
64			pfp->addr.type = PF_ADDR_ADDRMASK;
65			return (0);
66			}
67
68			int
69			add_nat(u_int32_t id, struct sockaddr src, int s_rd, struct sockaddr dst,
70			u_int16_t d_port, struct sockaddr *nat, u_int16_t nat_range_low,
71			u_int16_t nat_range_high)
72			{
73			if (!src \|\| !dst \|\| !d_port \|\| !nat \|\| !nat_range_low \|\|
74			!nat_range_high \|\| (src->sa_family != nat->sa_family)) {
75			errno = EINVAL;
76			return (-1);
77			}
78
79			if (prepare_rule(id, src, dst, d_port) == -1)
80			return (-1);
81
82			if (add_addr(nat, &pfr.rule.nat) == -1)
83			return (-1);
84
85			pfr.rule.direction = PF_OUT;
86			pfr.rule.onrdomain = s_rd;
87			pfr.rule.rtableid = -1;
88			pfr.rule.nat.proxy_port[0] = nat_range_low;
89			pfr.rule.nat.proxy_port[1] = nat_range_high;
90			if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
91			return (-1);
92
93			return (0);
94			}
95
96			int
97			add_rdr(u_int32_t id, struct sockaddr src, int s_rd, struct sockaddr dst,
98			u_int16_t d_port, struct sockaddr *rdr, u_int16_t rdr_port, int d_rd)
99			{
100			if (!src \|\| !dst \|\| !d_port \|\| !rdr \|\| !rdr_port \|\|
101			(src->sa_family != rdr->sa_family)) {
102			errno = EINVAL;
103			return (-1);
104			}
105
106			if (prepare_rule(id, src, dst, d_port) == -1)
107			return (-1);
108
109			if (add_addr(rdr, &pfr.rule.rdr) == -1)
110			return (-1);
111
112			pfr.rule.direction = PF_IN;
113			pfr.rule.onrdomain = s_rd;
114			pfr.rule.rtableid = d_rd;
115			pfr.rule.rdr.proxy_port[0] = rdr_port;
116			if (ioctl(dev, DIOCADDRULE, &pfr) == -1)
117			return (-1);
118
119			return (0);
120			}
121
122			int
123			do_commit(void)
124			{
125			if (ioctl(dev, DIOCXCOMMIT, &pft) == -1)
126			return (-1);
127
128			return (0);
129			}
130
131			int
132			do_rollback(void)
133			{
134			if (ioctl(dev, DIOCXROLLBACK, &pft) == -1)
135			return (-1);
136
137			return (0);
138			}
139
140			void
141			init_filter(char opt_qname, char opt_tagname, int opt_verbose)
142			{
143			struct pf_status status;
144
145			qname = opt_qname;
146			tagname = opt_tagname;
147
148			if (opt_verbose == 1)
149			rule_log = PF_LOG;
150			else if (opt_verbose == 2)
151			rule_log = PF_LOG_ALL;
152
153			dev = open("/dev/pf", O_RDWR);
154			if (dev == -1)
155			err(1, "open /dev/pf");
156			if (ioctl(dev, DIOCGETSTATUS, &status) == -1)
157			err(1, "DIOCGETSTATUS");
158			if (!status.running)
159			errx(1, "pf is disabled");
160			}
161
162			int
163			prepare_commit(u_int32_t id)
164			{
165			char an[PF_ANCHOR_NAME_SIZE];
166
167			memset(&pft, 0, sizeof pft);
168			pft.size = 1;
169			pft.esize = sizeof pfte;
170			pft.array = &pfte;
171
172			snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
173			getpid(), id);
174			memset(&pfte, 0, sizeof pfte);
175			strlcpy(pfte.anchor, an, PF_ANCHOR_NAME_SIZE);
176			pfte.type = PF_TRANS_RULESET;
177
178			if (ioctl(dev, DIOCXBEGIN, &pft) == -1)
179			return (-1);
180
181			return (0);
182			}
183
184			int
185			prepare_rule(u_int32_t id, struct sockaddr *src,
186			struct sockaddr *dst, u_int16_t d_port)
187			{
188			char an[PF_ANCHOR_NAME_SIZE];
189
190			if ((src->sa_family != AF_INET && src->sa_family != AF_INET6) \|\|
191			(src->sa_family != dst->sa_family)) {
192			errno = EPROTONOSUPPORT;
193			return (-1);
194			}
195
196			memset(&pfr, 0, sizeof pfr);
197			snprintf(an, PF_ANCHOR_NAME_SIZE, "%s/%d.%d", FTP_PROXY_ANCHOR,
198			getpid(), id);
199			strlcpy(pfr.anchor, an, PF_ANCHOR_NAME_SIZE);
200
201			pfr.ticket = pfte.ticket;
202
203			/* Generic for all rule types. */
204			pfr.rule.af = src->sa_family;
205			pfr.rule.proto = IPPROTO_TCP;
206			pfr.rule.src.addr.type = PF_ADDR_ADDRMASK;
207			pfr.rule.dst.addr.type = PF_ADDR_ADDRMASK;
208			pfr.rule.nat.addr.type = PF_ADDR_NONE;
209			pfr.rule.rdr.addr.type = PF_ADDR_NONE;
210
211			if (src->sa_family == AF_INET) {
212			memcpy(&pfr.rule.src.addr.v.a.addr.v4,
213			&satosin(src)->sin_addr.s_addr, 4);
214			memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 4);
215			memcpy(&pfr.rule.dst.addr.v.a.addr.v4,
216			&satosin(dst)->sin_addr.s_addr, 4);
217			memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 4);
218			} else {
219			memcpy(&pfr.rule.src.addr.v.a.addr.v6,
220			&satosin6(src)->sin6_addr.s6_addr, 16);
221			memset(&pfr.rule.src.addr.v.a.mask.addr8, 255, 16);
222			memcpy(&pfr.rule.dst.addr.v.a.addr.v6,
223			&satosin6(dst)->sin6_addr.s6_addr, 16);
224			memset(&pfr.rule.dst.addr.v.a.mask.addr8, 255, 16);
225			}
226			pfr.rule.dst.port_op = PF_OP_EQ;
227			pfr.rule.dst.port[0] = htons(d_port);
228
229			/*
230			* pass [quick] [log] inet[6] proto tcp \
231			* from $src to $dst port = $d_port flags S/SA keep state
232			* (max 1) [queue qname] [tag tagname]
233			*/
234			if (tagname != NULL)
235			pfr.rule.action = PF_MATCH;
236			else
237			pfr.rule.action = PF_PASS;
238			pfr.rule.quick = 1;
239			pfr.rule.log = rule_log;
240			pfr.rule.keep_state = 1;
241			pfr.rule.flags = TH_SYN;
242			pfr.rule.flagset = (TH_SYN\|TH_ACK);
243			pfr.rule.max_states = 1;
244			if (qname != NULL)
245			strlcpy(pfr.rule.qname, qname, sizeof pfr.rule.qname);
246			if (tagname != NULL) {
247			pfr.rule.quick = 0;
248			strlcpy(pfr.rule.tagname, tagname,
249			sizeof pfr.rule.tagname);
250			}
251
252			return (0);
253			}