*
* This file is part of Trivial IP Encryption (TrIPE).
*
- * TrIPE is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
+ * TrIPE is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License as published by the Free
+ * Software Foundation; either version 3 of the License, or (at your
+ * option) any later version.
*
- * TrIPE is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
+ * TrIPE is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+ * for more details.
*
* You should have received a copy of the GNU General Public License
- * along with TrIPE; if not, write to the Free Software Foundation,
- * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ * along with TrIPE. If not, see <https://www.gnu.org/licenses/>.
*/
/*----- Header files ------------------------------------------------------*/
#include "tripe.h"
+/*----- Global state ------------------------------------------------------*/
+
+sel_file udpsock[NADDRFAM];
+
/*----- Static variables --------------------------------------------------*/
static sym_table byname;
static addrmap byaddr;
-static sel_file sock;
+static unsigned nmobile;
/*----- Tunnel table ------------------------------------------------------*/
p_pingdone(pg, PING_OK);
}
+/* --- @p_rxupdstats@ --- *
+ *
+ * Arguments: @peer *p@ = peer to update
+ * @size_t n@ = size of incoming packet
+ *
+ * Returns: ---
+ *
+ * Use: Updates the peer's incoming packet statistics.
+ */
+
+static void p_rxupdstats(peer *p, size_t n)
+{
+ p->st.t_last = time(0);
+ p->st.n_in++;
+ p->st.sz_in += n;
+}
+
+/* --- @p_encrypt@ --- *
+ *
+ * Arguments: @peer *p@ = peer to encrypt message to
+ * @int ty@ message type to send
+ * @buf *bin, *bout@ = input and output buffers
+ *
+ * Returns: ---
+ *
+ * Use: Convenience function for packet encryption. Forces
+ * renegotiation when necessary. Check for the output buffer
+ * being broken to find out whether the encryption was
+ * successful.
+ */
+
+static int p_encrypt(peer *p, int ty, buf *bin, buf *bout)
+{
+ int err = ksl_encrypt(&p->ks, ty, bin, bout);
+
+ if (err == KSERR_REGEN) {
+ kx_start(&p->kx, 1);
+ err = 0;
+ }
+ if (!BOK(bout))
+ err = -1;
+ return (err);
+}
+
+/* --- @p_updateaddr@ --- *
+ *
+ * Arguments: @peer *p@ = pointer to peer block
+ * @const addr *a@ = address to associate with this peer
+ *
+ * Returns: Zero if the address was changed; @+1@ if it was already
+ * right.
+ *
+ * Use: Updates our idea of @p@'s address.
+ */
+
+int p_updateaddr(peer *p, const addr *a)
+{
+ peer *q;
+ peer_byaddr *pa, *qa;
+ int ix;
+ unsigned f;
+
+ /* --- Figure out how to proceed --- *
+ *
+ * If this address already belongs to a different peer, then swap the
+ * addresses over. This doesn't leave the displaced peer in an especially
+ * good state, but it ought to get sorted out soon enough.
+ */
+
+ pa = am_find(&byaddr, a, sizeof(peer_byaddr), &f);
+ if (f && pa->p == p)
+ return (+1);
+ else if (!f) {
+ T( trace(T_PEER, "peer: updating address for `%s'", p_name(p)); )
+ am_remove(&byaddr, p->byaddr);
+ p->byaddr = pa; p->spec.sa = *a; pa->p = p;
+ p->afix = afix(p->spec.sa.sa.sa_family); assert(p->afix >= 0);
+ a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END);
+ return (0);
+ } else {
+ q = pa->p; qa = p->byaddr;
+ T( trace(T_PEER, "peer: swapping addresses for `%s' and `%s'",
+ p_name(p), p_name(q)); )
+ q->byaddr = qa; qa->p = q; q->spec.sa = p->spec.sa;
+ p->byaddr = pa; pa->p = p; p->spec.sa = *a;
+ ix = p->afix; p->afix = q->afix; q->afix = ix;
+ a_notify("NEWADDR", "?PEER", p, "?ADDR", a, A_END);
+ a_notify("NEWADDR", "?PEER", q, "?ADDR", &q->spec.sa, A_END);
+ return (0);
+ }
+}
+
+/* --- @p_decrypt@ --- *
+ *
+ * Arguments: @peer **pp@ = pointer to peer to decrypt message from
+ * @addr *a@ = address the packet arrived on
+ * @size_t n@ = size of original incoming packet
+ * @int ty@ = message type to expect
+ * @buf *bin, *bout@ = input and output buffers
+ *
+ * Returns: Zero on success; nonzero on error.
+ *
+ * Use: Convenience function for packet decryption. Reports errors
+ * and updates statistics appropriately.
+ *
+ * If @*pp@ is null on entry and there are mobile peers then we
+ * see if any of them can decrypt the packet. If so, we record
+ * @*a@ as the peer's new address and send a notification.
+ */
+
+static int p_decrypt(peer **pp, addr *a, size_t n,
+ int ty, buf *bin, buf *bout)
+{
+ peer *p, *q;
+ int err = KSERR_DECRYPT;
+
+ /* --- If we have a match on the source address then try that first --- */
+
+ q = *pp;
+ if (q) {
+ T( trace(T_PEER, "peer: decrypting packet from known peer `%s'",
+ p_name(q)); )
+ if ((err = ksl_decrypt(&q->ks, ty, bin, bout)) != KSERR_DECRYPT ||
+ !(q->spec.f & PSF_MOBILE) || nmobile == 1) {
+ p = q;
+ goto match;
+ }
+ T( trace(T_PEER, "peer: failed to decrypt: try other mobile peers..."); )
+ } else if (nmobile)
+ T( trace(T_PEER, "peer: unknown source: trying mobile peers...") );
+ else {
+ p = 0;
+ goto searched;
+ }
+
+ /* --- See whether any mobile peer is interested --- */
+
+ p = 0;
+ FOREACH_PEER(qq, {
+ if (qq == q || !(qq->spec.f & PSF_MOBILE)) continue;
+ if ((err = ksl_decrypt(&qq->ks, ty, bin, bout)) == KSERR_DECRYPT) {
+ T( trace(T_PEER, "peer: peer `%s' failed to decrypt",
+ p_name(qq)); )
+ continue;
+ } else {
+ p = qq;
+ IF_TRACING(T_PEER, {
+ if (!err)
+ trace(T_PEER, "peer: peer `%s' reports success", p_name(qq));
+ else {
+ trace(T_PEER, "peer: peer `%s' reports decryption error %d",
+ p_name(qq), err);
+ }
+ })
+ break;
+ }
+ });
+
+ /* --- We've searched the mobile peers --- */
+
+searched:
+ if (!p) {
+ if (!q)
+ a_warn("PEER", "-", "unexpected-source", "?ADDR", a, A_END);
+ else {
+ a_warn("PEER", "?PEER", p, "decrypt-failed",
+ "error-code", "%d", err, A_END);
+ p_rxupdstats(q, n);
+ }
+ return (-1);
+ }
+
+ /* --- We found one that accepted, so update the peer's address --- */
+
+ if (!err) {
+ *pp = p;
+ p_updateaddr(p, a);
+ }
+
+match:
+ p_rxupdstats(p, n);
+ if (err) {
+ if (p) p->st.n_reject++;
+ a_warn("PEER", "?PEER", p, "decrypt-failed",
+ "error-code", "%d", err, A_END);
+ return (-1);
+ }
+ if (!BOK(bout))
+ return (-1);
+ return (0);
+}
+
/* --- @p_read@ --- *
*
* Arguments: @int fd@ = file descriptor to read from
{
peer *p = 0;
addr a;
- size_t sz;
+ socklen_t sz;
ssize_t n;
int ch;
buf b, bb;
/* --- Read the data --- */
- TIMER;
+ QUICKRAND;
sz = sizeof(addr);
n = recvfrom(fd, buf_i, sizeof(buf_i), 0, &a.sa, &sz);
if (n < 0) {
return;
}
- /* --- Find the appropriate peer --- */
+ /* --- Find the appropriate peer --- *
+ *
+ * At this stage, don't worry too much about whether we actually found it.
+ */
- if ((p = p_findbyaddr(&a)) == 0) {
- a_warn("PEER", "-", "unexpected-source", "?ADDR", &a, A_END);
- return;
- }
+ p = p_findbyaddr(&a);
IF_TRACING(T_PEER, {
- trace(T_PEER, "peer: packet received from `%s'", p->spec.name);
+ if (p) {
+ trace(T_PEER,
+ "peer: packet received from `%s' from address INET %s %d",
+ p_name(p), inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port));
+ } else {
+ trace(T_PEER, "peer: packet received from unknown address INET %s %d",
+ inet_ntoa(a.sin.sin_addr), ntohs(a.sin.sin_port));
+ }
trace_block(T_PACKET, "peer: packet contents", buf_i, n);
})
/* --- Pick the packet apart --- */
- p->st.t_last = time(0);
- p->st.n_in++;
- p->st.sz_in += n;
buf_init(&b, buf_i, n);
if ((ch = buf_getbyte(&b)) < 0) {
a_warn("PEER", "?PEER", p, "bad-packet", "no-type", A_END);
"bad-packet",
"unknown-type", "0x%02x", ch,
A_END);
- p->st.n_reject++;
+ if (p) p->st.n_reject++;
return;
}
buf_init(&bb, buf_o, sizeof(buf_o));
- if (ksl_decrypt(&p->ks, MSG_PACKET, &b, &bb)) {
- p->st.n_reject++;
- a_warn("PEER", "?PEER", p, "decrypt-failed", A_END);
+ if (p_decrypt(&p, &a, n, MSG_PACKET, &b, &bb))
return;
- }
if (BOK(&bb)) {
p->st.n_ipin++;
p->st.sz_ipin += BSZ(&b);
}
break;
case MSG_KEYEXCH:
+ if (!p) goto unexp;
+ p_rxupdstats(p, n);
kx_message(&p->kx, ch & MSG_TYPEMASK, &b);
break;
case MSG_MISC:
switch (ch & MSG_TYPEMASK) {
case MISC_NOP:
+ if (!p) goto unexp;
+ p_rxupdstats(p, n);
T( trace(T_PEER, "peer: received NOP packet"); )
break;
case MISC_PING:
+ if (!p) goto unexp;
+ p_rxupdstats(p, n);
buf_put(p_txstart(p, MSG_MISC | MISC_PONG), BCUR(&b), BLEFT(&b));
p_txend(p);
break;
case MISC_PONG:
+ if (!p) goto unexp;
+ p_rxupdstats(p, n);
p_ponged(p, MISC_PONG, &b);
break;
case MISC_EPING:
buf_init(&bb, buf_t, sizeof(buf_t));
- if (ksl_decrypt(&p->ks, ch, &b, &bb)) {
- p->st.n_reject++;
- a_warn("PEER", "?PEER", p, "decrypt-failed", A_END);
+ if (p_decrypt(&p, &a, n, ch, &b, &bb))
return;
- }
if (BOK(&bb)) {
buf_flip(&bb);
- if (ksl_encrypt(&p->ks, MSG_MISC | MISC_EPONG, &bb,
- p_txstart(p, MSG_MISC | MISC_EPONG)))
- kx_start(&p->kx, 0);
+ p_encrypt(p, MSG_MISC | MISC_EPONG, &bb,
+ p_txstart(p, MSG_MISC | MISC_EPONG));
p_txend(p);
}
break;
case MISC_EPONG:
buf_init(&bb, buf_t, sizeof(buf_t));
- if (ksl_decrypt(&p->ks, ch, &b, &bb)) {
- p->st.n_reject++;
- a_warn("PEER", "?PEER", p, "decrypt-failed", A_END);
+ if (p_decrypt(&p, &a, n, ch, &b, &bb))
return;
- }
if (BOK(&bb)) {
buf_flip(&bb);
p_ponged(p, MISC_EPONG, &bb);
}
break;
default:
- p->st.n_reject++;
+ if (p) p->st.n_reject++;
a_warn("PEER",
"?PEER", p,
"bad-packet",
- "unknown-category" "0x%02x", ch,
+ "unknown-category", "0x%02x", ch,
A_END);
break;
+ unexp:
+ a_warn("PEER", "-", "unexpected-source", "?ADDR", &a, A_END);
+ break;
}
}
static int p_dotxend(peer *p)
{
+ socklen_t sasz = addrsz(&p->spec.sa);
+
if (!BOK(&p->b)) {
a_warn("PEER", "?PEER", p, "packet-build-failed", A_END);
return (0);
}
IF_TRACING(T_PEER, trace_block(T_PACKET, "peer: sending packet",
BBASE(&p->b), BLEN(&p->b)); )
- if (sendto(sock.fd, BBASE(&p->b), BLEN(&p->b),
- 0, &p->spec.sa.sa, p->spec.sasz) < 0) {
+ if (sendto(udpsock[p->afix].fd, BBASE(&p->b), BLEN(&p->b),
+ 0, &p->spec.sa.sa, sasz) < 0) {
a_warn("PEER", "?PEER", p, "socket-write-error", "?ERRNO", A_END);
return (0);
} else {
buf_init(&bb, buf_t, sizeof(buf_t));
p_pingwrite(pg, &bb);
buf_flip(&bb);
- if (ksl_encrypt(&p->ks, MSG_MISC | MISC_EPING, &bb, b))
- kx_start(&p->kx, 0);
+ p_encrypt(p, MSG_MISC | MISC_EPING, &bb, b);
if (!BOK(b))
return (-1);
p_txend(p);
{
buf *bb = p_txstart(p, MSG_PACKET);
- TIMER;
- if (ksl_encrypt(&p->ks, MSG_PACKET, b, bb))
- kx_start(&p->kx, 0);
+ QUICKRAND;
+ p_encrypt(p, MSG_PACKET, b, bb);
if (BOK(bb) && BLEN(bb)) {
p->st.n_ipout++;
p->st.sz_ipout += BLEN(bb);
strerror(errno));
}
fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
- sel_initfile(&sel, &sock, fd, SEL_READ, p_read, 0);
- sel_addfile(&sock);
+ sel_initfile(&sel, &udpsock[AFIX_INET], fd, SEL_READ, p_read, 0);
+ sel_addfile(&udpsock[AFIX_INET]);
T( trace(T_PEER, "peer: created socket"); )
sym_create(&byname);
/* --- @p_port@ --- *
*
- * Arguments: ---
+ * Arguments: @int i@ = address family index to retrieve
*
* Returns: Port number used for socket.
*/
-unsigned p_port(void)
+unsigned p_port(int i)
{
addr a;
- size_t sz = sizeof(addr);
+ socklen_t sz = sizeof(addr);
- if (getsockname(sock.fd, &a.sa, &sz))
+ if (getsockname(udpsock[i].fd, &a.sa, &sz))
die(EXIT_FAILURE, "couldn't read port number: %s", strerror(errno));
- assert(a.sa.sa_family == AF_INET);
- return (ntohs(a.sin.sin_port));
+ return (getport(&a));
}
/* --- @p_keepalive@ --- *
static void p_keepalive(struct timeval *now, void *pv)
{
peer *p = pv;
+
p_txstart(p, MSG_MISC | MISC_NOP); p_dotxend(p);
T( trace(T_PEER, "peer: sent keepalive to %s", p->spec.name); )
p_setkatimer(p);
peer *p_create(peerspec *spec)
{
peer *p = CREATE(peer);
+ const tunnel_ops *tops = spec->tops;
+ int fd;
unsigned f;
p->byname = sym_find(&byname, spec->name, -1, sizeof(peer_byname), &f);
T( trace(T_PEER, "peer: creating new peer `%s'", spec->name); )
p->spec = *spec;
p->spec.name = (/*unconst*/ char *)SYM_NAME(p->byname);
+ if (spec->tag) p->spec.tag = xstrdup(spec->tag);
+ if (spec->privtag) p->spec.privtag = xstrdup(spec->privtag);
p->ks = 0;
p->pings = 0;
p->ifname = 0;
+ p->afix = afix(p->spec.sa.sa.sa_family); assert(p->afix >= 0);
memset(&p->st, 0, sizeof(stats));
p->st.t_start = time(0);
- if ((p->t = spec->tops->create(p, &p->ifname)) == 0)
+ if (!(tops->flags & TUNF_PRIVOPEN))
+ fd = -1;
+ else if ((fd = ps_tunfd(tops, &p->ifname)) < 0)
goto tidy_2;
- p_setkatimer(p);
- if (kx_init(&p->kx, p, &p->ks, p->spec.kxf))
+ if ((p->t = tops->create(p, fd, &p->ifname)) == 0)
goto tidy_3;
+ T( trace(T_TUNNEL, "peer: attached interface %s to peer `%s'",
+ p->ifname, p_name(p)); )
+ p_setkatimer(p);
+ if (kx_init(&p->kx, p, &p->ks, p->spec.f & PSF_KXMASK))
+ goto tidy_4;
a_notify("ADD",
- "?PEER", p,
- "%s", p->ifname,
- "?ADDR", &p->spec.sa,
- A_END);
- if (!(p->spec.kxf & KXF_CORK)) {
+ "?PEER", p,
+ "%s", p->ifname,
+ "?ADDR", &p->spec.sa,
+ A_END);
+ if (!(p->spec.f & KXF_CORK)) {
a_notify("KXSTART", "?PEER", p, A_END);
/* Couldn't tell anyone before */
}
+ if (p->spec.f & PSF_MOBILE) nmobile++;
return (p);
-tidy_3:
- if (spec->t_ka)
- sel_rmtimer(&p->tka);
+tidy_4:
+ if (spec->t_ka) sel_rmtimer(&p->tka);
xfree(p->ifname);
p->t->ops->destroy(p->t);
+tidy_3:
+ if (fd >= 0) close(fd);
tidy_2:
am_remove(&byaddr, p->byaddr);
+ if (p->spec.tag) xfree(p->spec.tag);
+ if (p->spec.privtag) xfree(p->spec.privtag);
tidy_1:
sym_remove(&byname, p->byname);
tidy_0:
* Returns: A pointer to the peer's name.
*/
-const char *p_name(peer *p) { return (p->spec.name); }
+const char *p_name(peer *p)
+ { if (p) return (p->spec.name); else return ("-"); }
+
+/* --- @p_tag@ --- *
+ *
+ * Arguments: @peer *p@ = pointer to a peer block
+ *
+ * Returns: A pointer to the peer's public key tag.
+ */
+
+const char *p_tag(peer *p)
+ { return (p->spec.tag ? p->spec.tag : p->spec.name); }
+
+/* --- @p_privtag@ --- *
+ *
+ * Arguments: @peer *p@ = pointer to a peer block
+ *
+ * Returns: A pointer to the peer's private key tag.
+ */
+
+const char *p_privtag(peer *p)
+ { return (p->spec.privtag ? p->spec.privtag : tag_priv); }
/* --- @p_spec@ --- *
*
{
peer_byaddr *pa;
- if ((pa = am_find(&byaddr, a, 0, 0)) != 0)
+ if ((pa = am_find(&byaddr, a, 0, 0)) != 0) {
+ assert(pa->p);
return (pa->p);
+ }
return (0);
}
a_notify("KILL", "%s", p->spec.name, A_END);
ksl_free(&p->ks);
kx_free(&p->kx);
- if (p->ifname)
- xfree(p->ifname);
+ if (p->spec.f & PSF_MOBILE) nmobile--;
+ if (p->ifname) xfree(p->ifname);
+ if (p->spec.tag) xfree(p->spec.tag);
+ if (p->spec.privtag) xfree(p->spec.privtag);
p->t->ops->destroy(p->t);
- if (p->spec.t_ka)
- sel_rmtimer(&p->tka);
+ if (p->spec.t_ka) sel_rmtimer(&p->tka);
for (pg = p->pings; pg; pg = ppg) {
ppg = pg->next;
p_pingdone(pg, PING_PEERDIED);
~mdw / tripe / blobdiff