freebsd-dev/lib/libipsec/ipsec_dump_policy.c
Bruce M Simpson 1922fd129e Initial import of RFC 2385 (TCP-MD5) digest support.
This is the second of two commits; bring in the userland support to finish.

Teach libipsec and setkey about the tcp-md5 class of security associations,
thus allowing administrators to add per-host keys to the SADB for use by
the tcpsignature_compute() function.

Document that a single SPI must be used until such time as the code which
adds support to the SPD to specify flows for tcp-md5 treatment is suitable
for production.

Sponsored by:	sentex.net
2004-02-11 04:34:34 +00:00

307 lines
7.4 KiB
C

/* $KAME: ipsec_dump_policy.c,v 1.13 2002/06/27 14:35:11 itojun Exp $ */
/*
* Copyright (C) 1995, 1996, 1997, 1998, and 1999 WIDE Project.
* 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.
* 3. Neither the name of the project nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE PROJECT 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 PROJECT 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/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/param.h>
#include <sys/socket.h>
#include <netkey/key_var.h>
#include <netinet/in.h>
#include <netinet6/ipsec.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <netdb.h>
#include "ipsec_strerror.h"
static const char *ipsp_dir_strs[] = {
"any", "in", "out",
};
static const char *ipsp_policy_strs[] = {
"discard", "none", "ipsec", "entrust", "bypass",
};
static char *ipsec_dump_ipsecrequest(char *, size_t,
struct sadb_x_ipsecrequest *, size_t);
static int set_addresses(char *, size_t, struct sockaddr *, struct sockaddr *);
static char *set_address(char *, size_t, struct sockaddr *);
/*
* policy is sadb_x_policy buffer.
* Must call free() later.
* When delimiter == NULL, alternatively ' '(space) is applied.
*/
char *
ipsec_dump_policy(policy, delimiter)
caddr_t policy;
char *delimiter;
{
struct sadb_x_policy *xpl = (struct sadb_x_policy *)policy;
struct sadb_x_ipsecrequest *xisr;
size_t off, buflen;
char *buf;
char isrbuf[1024];
char *newbuf;
/* sanity check */
if (policy == NULL)
return NULL;
if (xpl->sadb_x_policy_exttype != SADB_X_EXT_POLICY) {
__ipsec_errcode = EIPSEC_INVAL_EXTTYPE;
return NULL;
}
/* set delimiter */
if (delimiter == NULL)
delimiter = " ";
switch (xpl->sadb_x_policy_dir) {
case IPSEC_DIR_ANY:
case IPSEC_DIR_INBOUND:
case IPSEC_DIR_OUTBOUND:
break;
default:
__ipsec_errcode = EIPSEC_INVAL_DIR;
return NULL;
}
switch (xpl->sadb_x_policy_type) {
case IPSEC_POLICY_DISCARD:
case IPSEC_POLICY_NONE:
case IPSEC_POLICY_IPSEC:
case IPSEC_POLICY_BYPASS:
case IPSEC_POLICY_ENTRUST:
break;
default:
__ipsec_errcode = EIPSEC_INVAL_POLICY;
return NULL;
}
buflen = strlen(ipsp_dir_strs[xpl->sadb_x_policy_dir])
+ 1 /* space */
+ strlen(ipsp_policy_strs[xpl->sadb_x_policy_type])
+ 1; /* NUL */
if ((buf = malloc(buflen)) == NULL) {
__ipsec_errcode = EIPSEC_NO_BUFS;
return NULL;
}
snprintf(buf, buflen, "%s %s", ipsp_dir_strs[xpl->sadb_x_policy_dir],
ipsp_policy_strs[xpl->sadb_x_policy_type]);
if (xpl->sadb_x_policy_type != IPSEC_POLICY_IPSEC) {
__ipsec_errcode = EIPSEC_NO_ERROR;
return buf;
}
/* count length of buffer for use */
off = sizeof(*xpl);
while (off < PFKEY_EXTLEN(xpl)) {
xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
off += xisr->sadb_x_ipsecrequest_len;
}
/* validity check */
if (off != PFKEY_EXTLEN(xpl)) {
__ipsec_errcode = EIPSEC_INVAL_SADBMSG;
free(buf);
return NULL;
}
off = sizeof(*xpl);
while (off < PFKEY_EXTLEN(xpl)) {
xisr = (struct sadb_x_ipsecrequest *)((caddr_t)xpl + off);
if (ipsec_dump_ipsecrequest(isrbuf, sizeof(isrbuf), xisr,
PFKEY_EXTLEN(xpl) - off) == NULL) {
free(buf);
return NULL;
}
buflen = strlen(buf) + strlen(delimiter) + strlen(isrbuf) + 1;
newbuf = (char *)realloc(buf, buflen);
if (newbuf == NULL) {
__ipsec_errcode = EIPSEC_NO_BUFS;
free(buf);
return NULL;
}
buf = newbuf;
snprintf(buf, buflen, "%s%s%s", buf, delimiter, isrbuf);
off += xisr->sadb_x_ipsecrequest_len;
}
__ipsec_errcode = EIPSEC_NO_ERROR;
return buf;
}
static char *
ipsec_dump_ipsecrequest(buf, len, xisr, bound)
char *buf;
size_t len;
struct sadb_x_ipsecrequest *xisr;
size_t bound; /* boundary */
{
const char *proto, *mode, *level;
char abuf[NI_MAXHOST * 2 + 2];
if (xisr->sadb_x_ipsecrequest_len > bound) {
__ipsec_errcode = EIPSEC_INVAL_PROTO;
return NULL;
}
switch (xisr->sadb_x_ipsecrequest_proto) {
case IPPROTO_ESP:
proto = "esp";
break;
case IPPROTO_AH:
proto = "ah";
break;
case IPPROTO_IPCOMP:
proto = "ipcomp";
break;
case IPPROTO_TCP:
proto = "tcp";
default:
__ipsec_errcode = EIPSEC_INVAL_PROTO;
return NULL;
}
switch (xisr->sadb_x_ipsecrequest_mode) {
case IPSEC_MODE_ANY:
mode = "any";
break;
case IPSEC_MODE_TRANSPORT:
mode = "transport";
break;
case IPSEC_MODE_TUNNEL:
mode = "tunnel";
break;
default:
__ipsec_errcode = EIPSEC_INVAL_MODE;
return NULL;
}
abuf[0] = '\0';
if (xisr->sadb_x_ipsecrequest_len > sizeof(*xisr)) {
struct sockaddr *sa1, *sa2;
caddr_t p;
p = (caddr_t)(xisr + 1);
sa1 = (struct sockaddr *)p;
sa2 = (struct sockaddr *)(p + sa1->sa_len);
if (sizeof(*xisr) + sa1->sa_len + sa2->sa_len !=
xisr->sadb_x_ipsecrequest_len) {
__ipsec_errcode = EIPSEC_INVAL_ADDRESS;
return NULL;
}
if (set_addresses(abuf, sizeof(abuf), sa1, sa2) != 0) {
__ipsec_errcode = EIPSEC_INVAL_ADDRESS;
return NULL;
}
}
switch (xisr->sadb_x_ipsecrequest_level) {
case IPSEC_LEVEL_DEFAULT:
level = "default";
break;
case IPSEC_LEVEL_USE:
level = "use";
break;
case IPSEC_LEVEL_REQUIRE:
level = "require";
break;
case IPSEC_LEVEL_UNIQUE:
level = "unique";
break;
default:
__ipsec_errcode = EIPSEC_INVAL_LEVEL;
return NULL;
}
if (xisr->sadb_x_ipsecrequest_reqid == 0)
snprintf(buf, len, "%s/%s/%s/%s", proto, mode, abuf, level);
else {
int ch;
if (xisr->sadb_x_ipsecrequest_reqid > IPSEC_MANUAL_REQID_MAX)
ch = '#';
else
ch = ':';
snprintf(buf, len, "%s/%s/%s/%s%c%u", proto, mode, abuf, level,
ch, xisr->sadb_x_ipsecrequest_reqid);
}
return buf;
}
static int
set_addresses(buf, len, sa1, sa2)
char *buf;
size_t len;
struct sockaddr *sa1;
struct sockaddr *sa2;
{
char tmp1[NI_MAXHOST], tmp2[NI_MAXHOST];
if (set_address(tmp1, sizeof(tmp1), sa1) == NULL ||
set_address(tmp2, sizeof(tmp2), sa2) == NULL)
return -1;
if (strlen(tmp1) + 1 + strlen(tmp2) + 1 > len)
return -1;
snprintf(buf, len, "%s-%s", tmp1, tmp2);
return 0;
}
static char *
set_address(buf, len, sa)
char *buf;
size_t len;
struct sockaddr *sa;
{
const int niflags = NI_NUMERICHOST;
if (len < 1)
return NULL;
buf[0] = '\0';
if (getnameinfo(sa, sa->sa_len, buf, len, NULL, 0, niflags) != 0)
return NULL;
return buf;
}