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|
/* $OpenBSD: ipsecctl.c,v 1.70 2008/07/01 15:00:53 bluhm Exp $ */
/*
* Copyright (c) 2004, 2005 Hans-Joerg Hoexer <hshoexer@openbsd.org>
*
* 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/param.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <net/pfkeyv2.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/ip_ipsp.h>
#include <arpa/inet.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include "ipsecctl.h"
#include "pfkey.h"
int ipsecctl_rules(char *, int);
FILE *ipsecctl_fopen(const char *, const char *);
int ipsecctl_commit(int, struct ipsecctl *);
int ipsecctl_add_rule(struct ipsecctl *, struct ipsec_rule *);
void ipsecctl_free_rule(struct ipsec_rule *);
void ipsecctl_print_addr(struct ipsec_addr_wrap *);
void ipsecctl_print_proto(u_int8_t);
void ipsecctl_print_port(u_int16_t, const char *);
void ipsecctl_print_key(struct ipsec_key *);
void ipsecctl_print_flow(struct ipsec_rule *, int);
void ipsecctl_print_sa(struct ipsec_rule *, int);
void ipsecctl_print_sagroup(struct ipsec_rule *, int);
int ipsecctl_flush(int);
void ipsecctl_get_rules(struct ipsecctl *);
void ipsecctl_print_title(char *);
void ipsecctl_show_flows(int);
void ipsecctl_show_sas(int);
int ipsecctl_monitor(int);
void usage(void);
const char *ipsecctl_lookup_option(char *, const char **);
static int unmask(struct ipsec_addr *, sa_family_t);
int sacompare(const void *, const void *);
const char *showopt;
int first_title = 1;
static const char *showopt_list[] = {
"flow", "sa", "all", NULL
};
static const char *direction[] = {"?", "in", "out"};
static const char *flowtype[] = {"?", "use", "acquire", "require", "deny",
"bypass", "dontacq"};
static const char *satype[] = {"?", "esp", "ah", "ipcomp", "tcpmd5", "ipip"};
static const char *tmode[] = {"?", "transport", "tunnel"};
static const char *auth[] = {"?", "psk", "rsa"};
struct sad {
struct sadb_msg *sad_msg;
u_int32_t sad_spi;
};
int
sacompare(const void *va, const void *vb)
{
const struct sad *a = va, *b = vb;
if (a->sad_spi < b->sad_spi)
return (-1);
if (a->sad_spi > b->sad_spi)
return (1);
return (0);
}
int
ipsecctl_rules(char *filename, int opts)
{
struct ipsecctl ipsec;
int action, error = 0;
bzero(&ipsec, sizeof(ipsec));
ipsec.opts = opts;
TAILQ_INIT(&ipsec.rule_queue);
TAILQ_INIT(&ipsec.group_queue);
if (parse_rules(filename, &ipsec) < 0) {
warnx("Syntax error in config file: ipsec rules not loaded");
error = 1;
} else {
if (opts & IPSECCTL_OPT_DELETE)
action = ACTION_DELETE;
else
action = ACTION_ADD;
if ((opts & IPSECCTL_OPT_NOACTION) == 0)
error = ipsecctl_commit(action, &ipsec);
}
return (error);
}
FILE *
ipsecctl_fopen(const char *name, const char *mode)
{
struct stat st;
FILE *fp;
fp = fopen(name, mode);
if (fp == NULL)
return (NULL);
if (fstat(fileno(fp), &st)) {
fclose(fp);
return (NULL);
}
if (S_ISDIR(st.st_mode)) {
fclose(fp);
errno = EISDIR;
return (NULL);
}
return (fp);
}
int
ipsecctl_commit(int action, struct ipsecctl *ipsec)
{
struct ipsec_rule *rp;
int ret = 0;
if (pfkey_init() == -1)
errx(1, "ipsecctl_commit: failed to open PF_KEY socket");
while ((rp = TAILQ_FIRST(&ipsec->rule_queue))) {
TAILQ_REMOVE(&ipsec->rule_queue, rp, rule_entry);
if (rp->type & RULE_IKE) {
if (ike_ipsec_establish(action, rp) == -1) {
warnx("failed to %s rule %d",
action == ACTION_DELETE ? "delete" : "add",
rp->nr);
ret = 2;
}
} else {
if (pfkey_ipsec_establish(action, rp) == -1) {
warnx("failed to %s rule %d",
action == ACTION_DELETE ? "delete" : "add",
rp->nr);
ret = 2;
}
}
ipsecctl_free_rule(rp);
}
return (ret);
}
int
ipsecctl_add_rule(struct ipsecctl *ipsec, struct ipsec_rule *r)
{
TAILQ_INSERT_TAIL(&ipsec->rule_queue, r, rule_entry);
if ((ipsec->opts & IPSECCTL_OPT_VERBOSE) && !(ipsec->opts &
IPSECCTL_OPT_SHOW))
ipsecctl_print_rule(r, ipsec->opts);
return (0);
}
void
ipsecctl_free_rule(struct ipsec_rule *rp)
{
if (rp->src) {
free(rp->src->name);
free(rp->src);
}
if (rp->dst) {
free(rp->dst->name);
free(rp->dst);
}
if (rp->dst2) {
free(rp->dst2->name);
free(rp->dst2);
}
if (rp->local) {
free(rp->local->name);
free(rp->local);
}
if (rp->peer) {
free(rp->peer->name);
free(rp->peer);
}
if (rp->auth) {
if (rp->auth->srcid)
free(rp->auth->srcid);
if (rp->auth->dstid)
free(rp->auth->dstid);
free(rp->auth);
}
if (rp->ikeauth) {
if (rp->ikeauth->string)
free(rp->ikeauth->string);
free(rp->ikeauth);
}
if (rp->xfs)
free(rp->xfs);
if (rp->p1xfs)
free(rp->p1xfs);
if (rp->p2xfs)
free(rp->p2xfs);
if (rp->p1life)
free(rp->p1life);
if (rp->p2life)
free(rp->p2life);
if (rp->authkey) {
free(rp->authkey->data);
free(rp->authkey);
}
if (rp->enckey) {
free(rp->enckey->data);
free(rp->enckey);
}
if (rp->p1name)
free(rp->p1name);
if (rp->p2name)
free(rp->p2name);
if (rp->p2lid)
free(rp->p2lid);
if (rp->p2rid)
free(rp->p2rid);
free(rp);
}
void
ipsecctl_print_addr(struct ipsec_addr_wrap *ipa)
{
int bits;
char buf[NI_MAXHOST];
if (ipa == NULL) {
printf("?");
return;
}
if (inet_ntop(ipa->af, &ipa->address, buf, sizeof(buf)) == NULL)
printf("?");
else
printf("%s", buf);
bits = unmask(&ipa->mask, ipa->af);
if (bits != (ipa->af == AF_INET ? 32 : 128))
printf("/%d", bits);
}
void
ipsecctl_print_proto(u_int8_t proto)
{
struct protoent *p;
if ((p = getprotobynumber(proto)) != NULL)
printf("%s", p->p_name);
else
printf("%u", proto);
}
void
ipsecctl_print_port(u_int16_t port, const char *proto)
{
struct servent *s;
if ((s = getservbyport(port, proto)) != NULL)
printf("%s", s->s_name);
else
printf("%u", ntohs(port));
}
void
ipsecctl_print_key(struct ipsec_key *key)
{
int i;
for (i = 0; i < (int)key->len; i++)
printf("%02x", key->data[i]);
}
void
ipsecctl_print_flow(struct ipsec_rule *r, int opts)
{
printf("flow %s %s", satype[r->satype], direction[r->direction]);
if (r->proto) {
printf(" proto ");
ipsecctl_print_proto(r->proto);
}
printf(" from ");
ipsecctl_print_addr(r->src);
if (r->sport) {
printf(" port ");
ipsecctl_print_port(r->sport,
r->proto == IPPROTO_TCP ? "tcp" : "udp");
}
printf(" to ");
ipsecctl_print_addr(r->dst);
if (r->dport) {
printf(" port ");
ipsecctl_print_port(r->dport,
r->proto == IPPROTO_TCP ? "tcp" : "udp");
}
if (r->local) {
printf(" local ");
ipsecctl_print_addr(r->local);
}
if (r->peer) {
printf(" peer ");
ipsecctl_print_addr(r->peer);
}
if (r->auth) {
if (r->auth->srcid)
printf(" srcid %s", r->auth->srcid);
if (r->auth->dstid)
printf(" dstid %s", r->auth->dstid);
if (r->auth->type > 0)
printf(" %s", auth[r->auth->type]);
}
printf(" type %s", flowtype[r->flowtype]);
printf("\n");
}
/* ARGSUSED1 */
void
ipsecctl_print_sa(struct ipsec_rule *r, int opts)
{
printf("%s ", satype[r->satype]);
/* tunnel/transport is only meaningful esp/ah/ipcomp */
if (r->satype != IPSEC_TCPMD5 && r->satype != IPSEC_IPIP)
printf("%s ", tmode[r->tmode]);
printf("from ");
ipsecctl_print_addr(r->src);
printf(" to ");
ipsecctl_print_addr(r->dst);
printf(" spi 0x%08x", r->spi);
if (r->satype != IPSEC_TCPMD5) {
if (r->xfs && r->xfs->authxf)
printf(" auth %s", r->xfs->authxf->name);
if (r->xfs && r->xfs->encxf)
printf(" enc %s", r->xfs->encxf->name);
if (r->xfs && r->xfs->compxf)
printf(" comp %s", r->xfs->compxf->name);
}
if (r->authkey && (opts & IPSECCTL_OPT_SHOWKEY)) {
if (r->satype == IPSEC_TCPMD5)
printf(" ");
else
printf(" \\\n\t");
printf("authkey 0x");
ipsecctl_print_key(r->authkey);
}
if (r->enckey && (opts & IPSECCTL_OPT_SHOWKEY)) {
if (r->satype == IPSEC_TCPMD5)
printf(" ");
else
printf(" \\\n\t");
printf("enckey 0x");
ipsecctl_print_key(r->enckey);
}
printf("\n");
}
void
ipsecctl_print_sagroup(struct ipsec_rule *r, int opts)
{
if (!(opts & IPSECCTL_OPT_VERBOSE2))
return;
printf("[group %s to ", satype[r->proto]);
ipsecctl_print_addr(r->dst);
printf(" spi 0x%08x with %s to ", r->spi, satype[r->proto2]);
ipsecctl_print_addr(r->dst2);
printf(" spi 0x%08x", r->spi2);
printf("]\n");
}
void
ipsecctl_print_rule(struct ipsec_rule *r, int opts)
{
if (opts & IPSECCTL_OPT_VERBOSE2)
printf("@%d ", r->nr);
if (r->type & RULE_FLOW)
ipsecctl_print_flow(r, opts);
if (r->type & RULE_SA)
ipsecctl_print_sa(r, opts);
if (r->type & RULE_IKE)
ike_print_config(r, opts);
if (r->type & RULE_GROUP)
ipsecctl_print_sagroup(r, opts);
}
int
ipsecctl_flush(int opts)
{
if (opts & IPSECCTL_OPT_NOACTION)
return (0);
if (pfkey_init() == -1)
errx(1, "ipsecctl_flush: failed to open PF_KEY socket");
if (pfkey_ipsec_flush() == -1)
errx(1, "ipsecctl_flush: failed to flush");
return (0);
}
void
ipsecctl_get_rules(struct ipsecctl *ipsec)
{
struct sadb_msg *msg;
struct ipsec_rule *rule;
int mib[4];
size_t need;
char *buf, *lim, *next;
mib[0] = CTL_NET;
mib[1] = PF_KEY;
mib[2] = PF_KEY_V2;
mib[3] = NET_KEY_SPD_DUMP;
if (sysctl(mib, 4, NULL, &need, NULL, 0) == -1)
err(1, "ipsecctl_get_rules: sysctl");
if (need == 0)
return;
if ((buf = malloc(need)) == NULL)
err(1, "ipsecctl_get_rules: malloc");
if (sysctl(mib, 4, buf, &need, NULL, 0) == -1)
err(1, "ipsecctl_get_rules: sysctl");
lim = buf + need;
for (next = buf; next < lim; next += msg->sadb_msg_len *
PFKEYV2_CHUNK) {
msg = (struct sadb_msg *)next;
if (msg->sadb_msg_len == 0)
break;
rule = calloc(1, sizeof(struct ipsec_rule));
if (rule == NULL)
err(1, "ipsecctl_get_rules: calloc");
rule->nr = ipsec->rule_nr++;
rule->type |= RULE_FLOW;
if (pfkey_parse(msg, rule))
errx(1, "ipsecctl_get_rules: "
"failed to parse PF_KEY message");
ipsecctl_add_rule(ipsec, rule);
}
free(buf);
}
void
ipsecctl_print_title(char *title)
{
if (!first_title)
printf("\n");
first_title = 0;
printf("%s\n", title);
}
void
ipsecctl_show_flows(int opts)
{
struct ipsecctl ipsec;
struct ipsec_rule *rp;
bzero(&ipsec, sizeof(ipsec));
ipsec.opts = opts;
TAILQ_INIT(&ipsec.rule_queue);
ipsecctl_get_rules(&ipsec);
if (opts & IPSECCTL_OPT_SHOWALL)
ipsecctl_print_title("FLOWS:");
if (TAILQ_FIRST(&ipsec.rule_queue) == 0) {
if (opts & IPSECCTL_OPT_SHOWALL)
printf("No flows\n");
return;
}
while ((rp = TAILQ_FIRST(&ipsec.rule_queue))) {
TAILQ_REMOVE(&ipsec.rule_queue, rp, rule_entry);
ipsecctl_print_rule(rp, ipsec.opts);
free(rp->src->name);
free(rp->src);
free(rp->dst->name);
free(rp->dst);
if (rp->local) {
free(rp->local->name);
free(rp->local);
}
if (rp->peer) {
free(rp->peer->name);
free(rp->peer);
}
if (rp->auth) {
if (rp->auth->srcid)
free(rp->auth->srcid);
if (rp->auth->dstid)
free(rp->auth->dstid);
free(rp->auth);
}
free(rp);
}
}
void
ipsecctl_show_sas(int opts)
{
struct sadb_msg *msg;
struct sad *sad;
int mib[5], sacount, i;
size_t need = 0;
char *buf, *lim, *next;
mib[0] = CTL_NET;
mib[1] = PF_KEY;
mib[2] = PF_KEY_V2;
mib[3] = NET_KEY_SADB_DUMP;
mib[4] = SADB_SATYPE_UNSPEC;
if (opts & IPSECCTL_OPT_SHOWALL)
ipsecctl_print_title("SAD:");
/* When the SAD is empty we get ENOENT, no need to err(). */
if (sysctl(mib, 5, NULL, &need, NULL, 0) == -1 && errno != ENOENT)
err(1, "ipsecctl_show_sas: sysctl");
if (need == 0) {
if (opts & IPSECCTL_OPT_SHOWALL)
printf("No entries\n");
return;
}
if ((buf = malloc(need)) == NULL)
err(1, "ipsecctl_show_sas: malloc");
if (sysctl(mib, 5, buf, &need, NULL, 0) == -1)
err(1, "ipsecctl_show_sas: sysctl");
sacount = 0;
lim = buf + need;
for (next = buf; next < lim;
next += msg->sadb_msg_len * PFKEYV2_CHUNK) {
msg = (struct sadb_msg *)next;
if (msg->sadb_msg_len == 0)
break;
sacount++;
}
if ((sad = calloc(sacount, sizeof(*sad))) == NULL)
err(1, "ipsecctl_show_sas: calloc");
i = 0;
for (next = buf; next < lim;
next += msg->sadb_msg_len * PFKEYV2_CHUNK) {
msg = (struct sadb_msg *)next;
if (msg->sadb_msg_len == 0)
break;
sad[i].sad_spi = pfkey_get_spi(msg);
sad[i].sad_msg = msg;
i++;
}
qsort(sad, sacount, sizeof(*sad), sacompare);
for (i = 0; i < sacount; i++)
pfkey_print_sa(sad[i].sad_msg, opts);
free(sad);
free(buf);
}
int
ipsecctl_monitor(int opts)
{
return (pfkey_monitor(opts));
}
__dead void
usage(void)
{
extern char *__progname;
fprintf(stderr, "usage: %s [-dFkmnv] [-D macro=value] [-f file]"
" [-s modifier]\n", __progname);
exit(1);
}
const char *
ipsecctl_lookup_option(char *cmd, const char **list)
{
if (cmd != NULL && *cmd)
for (; *list; list++)
if (!strncmp(cmd, *list, strlen(cmd)))
return (*list);
return (NULL);
}
int
main(int argc, char *argv[])
{
int error = 0;
int ch;
int opts = 0;
char *rulesopt = NULL;
if (argc < 2)
usage();
while ((ch = getopt(argc, argv, "D:df:Fkmnvs:")) != -1) {
switch (ch) {
case 'D':
if (cmdline_symset(optarg) < 0)
warnx("could not parse macro definition %s",
optarg);
break;
case 'd':
opts |= IPSECCTL_OPT_DELETE;
break;
case 'f':
rulesopt = optarg;
break;
case 'F':
opts |= IPSECCTL_OPT_FLUSH;
break;
case 'k':
opts |= IPSECCTL_OPT_SHOWKEY;
break;
case 'm':
opts |= IPSECCTL_OPT_MONITOR;
break;
case 'n':
opts |= IPSECCTL_OPT_NOACTION;
break;
case 'v':
if (opts & IPSECCTL_OPT_VERBOSE)
opts |= IPSECCTL_OPT_VERBOSE2;
opts |= IPSECCTL_OPT_VERBOSE;
break;
case 's':
showopt = ipsecctl_lookup_option(optarg, showopt_list);
if (showopt == NULL) {
warnx("Unknown show modifier '%s'", optarg);
usage();
/* NOTREACHED */
}
opts |= IPSECCTL_OPT_SHOW;
break;
default:
usage();
/* NOTREACHED */
}
}
if (argc != optind) {
warnx("unknown command line argument: %s ...", argv[optind]);
usage();
/* NOTREACHED */
}
if (opts & IPSECCTL_OPT_FLUSH)
if (ipsecctl_flush(opts))
error = 1;
if (rulesopt != NULL)
if (ipsecctl_rules(rulesopt, opts))
error = 1;
if (showopt != NULL) {
switch (*showopt) {
case 'f':
ipsecctl_show_flows(opts);
break;
case 's':
ipsecctl_show_sas(opts);
break;
case 'a':
opts |= IPSECCTL_OPT_SHOWALL;
ipsecctl_show_flows(opts);
ipsecctl_show_sas(opts);
}
}
if (opts & IPSECCTL_OPT_MONITOR)
if (ipsecctl_monitor(opts))
error = 1;
exit(error);
}
/* ARGSUSED1 */
static int
unmask(struct ipsec_addr *ipa, sa_family_t af)
{
int i = 31, j = 0, b = 0;
u_int32_t tmp;
while (j < 4 && ipa->addr32[j] == 0xffffffff) {
b += 32;
j++;
}
if (j < 4) {
tmp = ntohl(ipa->addr32[j]);
for (i = 31; tmp & (1 << i); --i)
b++;
}
return (b);
}
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