/* site.c - manage communication with a remote network site */
-#include <stdio.h>
-#include <sys/mman.h>
+/* The 'site' code doesn't know anything about the structure of the
+ packets it's transmitting. In fact, under the new netlink
+ configuration scheme it doesn't need to know anything at all about
+ IP addresses, except how to contact its peer. This means it could
+ potentially be used to tunnel other protocols too (IPv6, IPX, plain
+ old Ethernet frames) if appropriate netlink code can be written
+ (and that ought not to be too hard, eg. using the TUN/TAP device to
+ pretend to be an Ethernet interface). */
+
+/* At some point in the future the netlink code will be asked for
+ configuration information to go in the PING/PONG packets at the end
+ of the key exchange. */
#include "secnet.h"
+#include <stdio.h>
+#include <string.h>
+#include <limits.h>
+#include <assert.h>
+#include <sys/socket.h>
+
+#include <sys/mman.h>
#include "util.h"
#include "unaligned.h"
+#include "magic.h"
#define SETUP_BUFFER_LEN 2048
-#define DEFAULT_KEY_LIFETIME 3600000
+#define DEFAULT_KEY_LIFETIME (3600*1000) /* [ms] */
+#define DEFAULT_KEY_RENEGOTIATE_GAP (5*60*1000) /* [ms] */
#define DEFAULT_SETUP_RETRIES 5
-#define DEFAULT_SETUP_TIMEOUT 1000
-#define DEFAULT_WAIT_TIME 10000
+#define DEFAULT_SETUP_RETRY_INTERVAL (2*1000) /* [ms] */
+#define DEFAULT_WAIT_TIME (20*1000) /* [ms] */
+
+#define DEFAULT_MOBILE_KEY_LIFETIME (2*24*3600*1000) /* [ms] */
+#define DEFAULT_MOBILE_KEY_RENEGOTIATE_GAP (12*3600*1000) /* [ms] */
+#define DEFAULT_MOBILE_SETUP_RETRIES 30
+#define DEFAULT_MOBILE_SETUP_RETRY_INTERVAL (1*1000) /* [ms] */
+#define DEFAULT_MOBILE_WAIT_TIME (10*1000) /* [ms] */
+
+#define DEFAULT_MOBILE_PEER_EXPIRY (2*60) /* [s] */
+#define DEFAULT_MOBILE_PEERS_MAX 3 /* send at most this many copies (default) */
/* Each site can be in one of several possible states. */
#define SITE_SENTMSG5 7
#define SITE_WAIT 8
-static string_t state_name(uint32_t state)
+int32_t site_max_start_pad = 4*4;
+
+static cstring_t state_name(uint32_t state)
{
switch (state) {
- case 0: return "SITE_STOP";
- case 1: return "SITE_RUN";
- case 2: return "SITE_RESOLVE";
- case 3: return "SITE_SENTMSG1";
- case 4: return "SITE_SENTMSG2";
- case 5: return "SITE_SENTMSG3";
- case 6: return "SITE_SENTMSG4";
- case 7: return "SITE_SENTMSG5";
- case 8: return "SITE_WAIT";
+ case 0: return "STOP";
+ case 1: return "RUN";
+ case 2: return "RESOLVE";
+ case 3: return "SENTMSG1";
+ case 4: return "SENTMSG2";
+ case 5: return "SENTMSG3";
+ case 6: return "SENTMSG4";
+ case 7: return "SENTMSG5";
+ case 8: return "WAIT";
default: return "*bad state*";
}
}
-#define LABEL_MSG0 0x00020200
-#define LABEL_MSG1 0x01010101
-#define LABEL_MSG2 0x02020202
-#define LABEL_MSG3 0x03030303
-#define LABEL_MSG4 0x04040404
-#define LABEL_MSG5 0x05050505
-#define LABEL_MSG6 0x06060606
-#define LABEL_MSG7 0x07070707
-#define LABEL_MSG8 0x08080808
-#define LABEL_MSG9 0x09090909
-
#define NONCELEN 8
#define LOG_UNEXPECTED 0x00000001
#define LOG_SETUP_TIMEOUT 0x00000004
#define LOG_ACTIVATE_KEY 0x00000008
#define LOG_TIMEOUT_KEY 0x00000010
-#define LOG_SEC 0x00000020
+#define LOG_SEC 0x00000020
#define LOG_STATE 0x00000040
#define LOG_DROP 0x00000080
#define LOG_DUMP 0x00000100
#define LOG_ERROR 0x00000400
+#define LOG_PEER_ADDRS 0x00000800
+
+static struct flagstr log_event_table[]={
+ { "unexpected", LOG_UNEXPECTED },
+ { "setup-init", LOG_SETUP_INIT },
+ { "setup-timeout", LOG_SETUP_TIMEOUT },
+ { "activate-key", LOG_ACTIVATE_KEY },
+ { "timeout-key", LOG_TIMEOUT_KEY },
+ { "security", LOG_SEC },
+ { "state-change", LOG_STATE },
+ { "packet-drop", LOG_DROP },
+ { "dump-packets", LOG_DUMP },
+ { "errors", LOG_ERROR },
+ { "peer-addrs", LOG_PEER_ADDRS },
+ { "default", LOG_SETUP_INIT|LOG_SETUP_TIMEOUT|
+ LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SEC|LOG_ERROR },
+ { "all", 0xffffffff },
+ { NULL, 0 }
+};
+
+
+/***** TRANSPORT PEERS declarations *****/
+
+/* Details of "mobile peer" semantics:
+
+ - We record mobile_peers_max peer address/port numbers ("peers")
+ for key setup, and separately mobile_peers_max for data
+ transfer. If these lists fill up, we retain the newest peers.
+ (For non-mobile peers we only record one of each.)
+
+ - Outgoing packets are sent to every recorded peer in the
+ applicable list.
+
+ - Data transfer peers are straightforward: whenever we successfully
+ process a data packet, we record the peer. Also, whenever we
+ successfully complete a key setup, we merge the key setup
+ peers into the data transfer peers.
+
+ (For "non-mobile" peers we simply copy the peer used for
+ successful key setup, and don't change the peer otherwise.)
+
+ - Key setup peers are slightly more complicated.
+
+ Whenever we receive and successfully process a key exchange
+ packet, we record the peer.
+
+ Whenever we try to initiate a key setup, we copy the list of data
+ transfer peers and use it for key setup. But we also look to see
+ if the config supplies an address and port number and if so we
+ add that as a key setup peer (possibly evicting one of the data
+ transfer peers we just copied).
+
+ (For "non-mobile" peers, if we if we have a configured peer
+ address and port, we always use that; otherwise if we have a
+ current data peer address we use that; otherwise we do not
+ attempt to initiate a key setup for lack of a peer address.)
+
+ "Record the peer" means
+ 1. expire any peers last seen >120s ("mobile-peer-expiry") ago
+ 2. add the peer of the just received packet to the applicable list
+ (possibly evicting older entries)
+ NB that we do not expire peers until an incoming packet arrives.
+
+ */
+
+#define MAX_MOBILE_PEERS_MAX 5 /* send at most this many copies, compiled max */
+
+typedef struct {
+ struct timeval last;
+ struct comm_addr addr;
+} transport_peer;
+
+typedef struct {
+/* configuration information */
+/* runtime information */
+ int npeers;
+ transport_peer peers[MAX_MOBILE_PEERS_MAX];
+} transport_peers;
+
+static void transport_peers_clear(struct site *st, transport_peers *peers);
+static int transport_peers_valid(transport_peers *peers);
+static void transport_peers_copy(struct site *st, transport_peers *dst,
+ const transport_peers *src);
+
+static void transport_setup_msgok(struct site *st, const struct comm_addr *a);
+static void transport_data_msgok(struct site *st, const struct comm_addr *a);
+static bool_t transport_compute_setupinit_peers(struct site *st,
+ const struct comm_addr *configured_addr /* 0 if none or not found */,
+ const struct comm_addr *prod_hint_addr /* 0 if none */);
+static void transport_record_peer(struct site *st, transport_peers *peers,
+ const struct comm_addr *addr, const char *m);
+
+static void transport_xmit(struct site *st, transport_peers *peers,
+ struct buffer_if *buf, bool_t candebug);
+
+ /***** END of transport peers declarations *****/
+
+
+struct data_key {
+ struct transform_inst_if *transform;
+ uint64_t key_timeout; /* End of life of current key */
+ uint32_t remote_session_id;
+};
struct site {
closure_t cl;
/* configuration information */
string_t localname;
string_t remotename;
- string_t tunname; /* localname<->remotename by default */
+ bool_t peer_mobile; /* Mobile client support */
+ int32_t transport_peers_max;
+ string_t tunname; /* localname<->remotename by default, used in logs */
string_t address; /* DNS name for bootstrapping, optional */
- int remoteport;
+ int remoteport; /* Port for bootstrapping, optional */
struct netlink_if *netlink;
- struct comm_if *comm;
+ struct comm_if **comms;
+ int ncomms;
struct resolver_if *resolver;
struct log_if *log;
struct random_if *random;
struct rsaprivkey_if *privkey;
- struct subnet_list remotenets;
struct rsapubkey_if *pubkey;
- struct transform_if *transform;
+ struct transform_if **transforms;
+ int ntransforms;
struct dh_if *dh;
struct hash_if *hash;
- void *netlink_cid;
- uint32_t setup_retries; /* How many times to send setup packets */
- uint32_t setup_timeout; /* Initial timeout for setup packets */
- uint32_t wait_timeout; /* How long to wait if setup unsuccessful */
- uint32_t key_lifetime; /* How long a key lasts once set up */
+ uint32_t index; /* Index of this site */
+ uint32_t local_capabilities;
+ int32_t setup_retries; /* How many times to send setup packets */
+ int32_t setup_retry_interval; /* Initial timeout for setup packets */
+ int32_t wait_timeout; /* How long to wait if setup unsuccessful */
+ int32_t mobile_peer_expiry; /* How long to remember 2ary addresses */
+ int32_t key_lifetime; /* How long a key lasts once set up */
+ int32_t key_renegotiate_time; /* If we see traffic (or a keepalive)
+ after this time, initiate a new
+ key exchange */
- uint8_t *setupsig; /* Expected signature of incoming MSG1 packets */
- uint32_t setupsiglen; /* Allows us to discard packets quickly if
- they are not for us */
bool_t setup_priority; /* Do we have precedence if both sites emit
message 1 simultaneously? */
uint32_t log_events;
/* runtime information */
uint32_t state;
uint64_t now; /* Most recently seen time */
-
- uint32_t remote_session_id;
- struct transform_inst_if *current_transform;
- bool_t current_valid;
- uint64_t current_key_timeout; /* End of life of current key */
- struct sockaddr_in peer; /* Current address of peer */
- bool_t peer_valid; /* Peer address becomes invalid when key times out,
- but only if we have a DNS name for our peer */
-
+ bool_t allow_send_prod;
+
+ /* The currently established session */
+ struct data_key current;
+ struct data_key auxiliary_key;
+ bool_t auxiliary_is_new;
+ uint64_t renegotiate_key_time; /* When we can negotiate a new key */
+ uint64_t auxiliary_renegotiate_key_time;
+ transport_peers peers; /* Current address(es) of peer for data traffic */
+
+ /* The current key setup protocol exchange. We can only be
+ involved in one of these at a time. There's a potential for
+ denial of service here (the attacker keeps sending a setup
+ packet; we keep trying to continue the exchange, and have to
+ timeout before we can listen for another setup packet); perhaps
+ we should keep a list of 'bad' sources for setup packets. */
+ uint32_t remote_capabilities;
+ struct transform_if *chosen_transform;
uint32_t setup_session_id;
- struct sockaddr_in setup_peer;
+ transport_peers setup_peers;
uint8_t localN[NONCELEN]; /* Nonces for key exchange */
uint8_t remoteN[NONCELEN];
struct buffer_if buffer; /* Current outgoing key exchange packet */
- uint32_t retries; /* Number of retries remaining */
+ struct buffer_if scratch;
+ int32_t retries; /* Number of retries remaining */
uint64_t timeout; /* Timeout for current state */
uint8_t *dhsecret;
uint8_t *sharedsecret;
-
+ uint32_t sharedsecretlen, sharedsecretallocd;
struct transform_inst_if *new_transform; /* For key setup/verify */
};
-static void slog(struct site *st, uint32_t event, string_t msg, ...)
+static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
+FORMAT(printf,3,4);
+static void slog(struct site *st, uint32_t event, cstring_t msg, ...)
{
va_list ap;
- uint8_t buf[240];
+ char buf[240];
+ uint32_t class;
va_start(ap,msg);
if (event&st->log_events) {
- vsnprintf(buf,240,msg,ap);
- st->log->log(st->log->st,0,"%s: %s",st->tunname,buf);
+ switch(event) {
+ case LOG_UNEXPECTED: class=M_INFO; break;
+ case LOG_SETUP_INIT: class=M_INFO; break;
+ case LOG_SETUP_TIMEOUT: class=M_NOTICE; break;
+ case LOG_ACTIVATE_KEY: class=M_INFO; break;
+ case LOG_TIMEOUT_KEY: class=M_INFO; break;
+ case LOG_SEC: class=M_SECURITY; break;
+ case LOG_STATE: class=M_DEBUG; break;
+ case LOG_DROP: class=M_DEBUG; break;
+ case LOG_DUMP: class=M_DEBUG; break;
+ case LOG_ERROR: class=M_ERR; break;
+ case LOG_PEER_ADDRS: class=M_DEBUG; break;
+ default: class=M_ERR; break;
+ }
+
+ vsnprintf(buf,sizeof(buf),msg,ap);
+ slilog(st->log,class,"%s: %s",st->tunname,buf);
}
va_end(ap);
}
+static void set_link_quality(struct site *st);
+static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel);
+static void delete_one_key(struct site *st, struct data_key *key,
+ const char *reason /* may be 0 meaning don't log*/,
+ const char *which /* ignored if !reasonn */,
+ uint32_t loglevel /* ignored if !reasonn */);
+static bool_t initiate_key_setup(struct site *st, cstring_t reason,
+ const struct comm_addr *prod_hint);
static void enter_state_run(struct site *st);
static bool_t enter_state_resolve(struct site *st);
-static bool_t enter_state_sentmsg1(struct site *st);
-static bool_t enter_state_sentmsg2(struct site *st);
-static bool_t enter_state_sentmsg3(struct site *st);
-static bool_t enter_state_sentmsg4(struct site *st);
-static bool_t enter_state_sentmsg5(struct site *st);
+static bool_t enter_new_state(struct site *st,uint32_t next);
static void enter_state_wait(struct site *st);
+static void activate_new_key(struct site *st);
+
+static bool_t is_transform_valid(struct transform_inst_if *transform)
+{
+ return transform && transform->valid(transform->st);
+}
+
+static bool_t current_valid(struct site *st)
+{
+ return is_transform_valid(st->current.transform);
+}
+
+#define DEFINE_CALL_TRANSFORM(fwdrev) \
+static int call_transform_##fwdrev(struct site *st, \
+ struct transform_inst_if *transform, \
+ struct buffer_if *buf, \
+ const char **errmsg) \
+{ \
+ if (!is_transform_valid(transform)) { \
+ *errmsg="transform not set up"; \
+ return 1; \
+ } \
+ return transform->fwdrev(transform->st,buf,errmsg); \
+}
+
+DEFINE_CALL_TRANSFORM(forwards)
+DEFINE_CALL_TRANSFORM(reverse)
+
+static void dispose_transform(struct transform_inst_if **transform_var)
+{
+ struct transform_inst_if *transform=*transform_var;
+ if (transform) {
+ transform->delkey(transform->st);
+ transform->destroy(transform->st);
+ }
+ *transform_var = 0;
+}
#define CHECK_AVAIL(b,l) do { if ((b)->size<(l)) return False; } while(0)
#define CHECK_EMPTY(b) do { if ((b)->size!=0) return False; } while(0)
type=buf_unprepend_uint32((b)); \
if (type!=(t)) return False; } while(0)
+struct parsedname {
+ int32_t len;
+ uint8_t *name;
+ struct buffer_if extrainfo;
+};
+
struct msg {
uint8_t *hashstart;
uint32_t dest;
uint32_t source;
- uint32_t remlen;
- uint8_t *remote;
- uint32_t loclen;
- uint8_t *local;
+ struct parsedname remote;
+ struct parsedname local;
+ uint32_t remote_capabilities;
+ int capab_transformnum;
uint8_t *nR;
uint8_t *nL;
- uint32_t pklen;
- uint8_t *pk;
- uint32_t hashlen;
- uint32_t siglen;
- uint8_t *sig;
+ int32_t pklen;
+ char *pk;
+ int32_t hashlen;
+ int32_t siglen;
+ char *sig;
};
-/* Build any of msg1 to msg4. msg5 and msg6 are built from the inside out
- using a transform. */
-static bool_t generate_msg(struct site *st, uint32_t type, string_t what)
+static void set_new_transform(struct site *st, char *pk)
+{
+ /* Make room for the shared key */
+ st->sharedsecretlen=st->chosen_transform->keylen?:st->dh->ceil_len;
+ assert(st->sharedsecretlen);
+ if (st->sharedsecretlen > st->sharedsecretallocd) {
+ st->sharedsecretallocd=st->sharedsecretlen;
+ st->sharedsecret=realloc(st->sharedsecret,st->sharedsecretallocd);
+ }
+ if (!st->sharedsecret) fatal_perror("site:sharedsecret");
+
+ /* Generate the shared key */
+ st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,pk,
+ st->sharedsecret,st->sharedsecretlen);
+
+ /* Set up the transform */
+ struct transform_if *generator=st->chosen_transform;
+ struct transform_inst_if *generated=generator->create(generator->st);
+ generated->setkey(generated->st,st->sharedsecret,
+ st->sharedsecretlen,st->setup_priority);
+ dispose_transform(&st->new_transform);
+ st->new_transform=generated;
+
+ slog(st,LOG_SETUP_INIT,"key exchange negotiated transform"
+ " %d (capabilities ours=%#"PRIx32" theirs=%#"PRIx32")",
+ st->chosen_transform->capab_transformnum,
+ st->local_capabilities, st->remote_capabilities);
+}
+
+struct xinfoadd {
+ int32_t lenpos, afternul;
+};
+static void append_string_xinfo_start(struct buffer_if *buf,
+ struct xinfoadd *xia,
+ const char *str)
+ /* Helps construct one of the names with additional info as found
+ * in MSG1..4. Call this function first, then append all the
+ * desired extra info (not including the nul byte) to the buffer,
+ * then call append_string_xinfo_done. */
+{
+ xia->lenpos = buf->size;
+ buf_append_string(buf,str);
+ buf_append_uint8(buf,0);
+ xia->afternul = buf->size;
+}
+static void append_string_xinfo_done(struct buffer_if *buf,
+ struct xinfoadd *xia)
+{
+ /* we just need to adjust the string length */
+ if (buf->size == xia->afternul) {
+ /* no extra info, strip the nul too */
+ buf_unappend_uint8(buf);
+ } else {
+ put_uint16(buf->start+xia->lenpos, buf->size-(xia->lenpos+2));
+ }
+}
+
+/* Build any of msg1 to msg4. msg5 and msg6 are built from the inside
+ out using a transform of config data supplied by netlink */
+static bool_t generate_msg(struct site *st, uint32_t type, cstring_t what)
{
void *hst;
- uint8_t *hash=alloca(st->hash->len);
+ uint8_t *hash;
string_t dhpub, sig;
st->retries=st->setup_retries;
buffer_init(&st->buffer,0);
buf_append_uint32(&st->buffer,
(type==LABEL_MSG1?0:st->setup_session_id));
- buf_append_uint32(&st->buffer,(uint32_t)st);
+ buf_append_uint32(&st->buffer,st->index);
buf_append_uint32(&st->buffer,type);
- buf_append_string(&st->buffer,st->localname);
+
+ struct xinfoadd xia;
+ append_string_xinfo_start(&st->buffer,&xia,st->localname);
+ if ((st->local_capabilities & CAPAB_EARLY) || (type != LABEL_MSG1)) {
+ buf_append_uint32(&st->buffer,st->local_capabilities);
+ }
+ append_string_xinfo_done(&st->buffer,&xia);
+
buf_append_string(&st->buffer,st->remotename);
memcpy(buf_append(&st->buffer,NONCELEN),st->localN,NONCELEN);
if (type==LABEL_MSG1) return True;
memcpy(buf_append(&st->buffer,NONCELEN),st->remoteN,NONCELEN);
if (type==LABEL_MSG2) return True;
+
+ if (hacky_par_mid_failnow()) return False;
+
+ if (type==LABEL_MSG3BIS)
+ buf_append_uint8(&st->buffer,st->chosen_transform->capab_transformnum);
+
dhpub=st->dh->makepublic(st->dh->st,st->dhsecret,st->dh->len);
buf_append_string(&st->buffer,dhpub);
free(dhpub);
+ hash=safe_malloc(st->hash->len, "generate_msg");
hst=st->hash->init();
st->hash->update(hst,st->buffer.start,st->buffer.size);
st->hash->final(hst,hash);
sig=st->privkey->sign(st->privkey->st,hash,st->hash->len);
buf_append_string(&st->buffer,sig);
free(sig);
+ free(hash);
+ return True;
+}
+
+static bool_t unpick_name(struct buffer_if *msg, struct parsedname *nm)
+{
+ CHECK_AVAIL(msg,2);
+ nm->len=buf_unprepend_uint16(msg);
+ CHECK_AVAIL(msg,nm->len);
+ nm->name=buf_unprepend(msg,nm->len);
+ uint8_t *nul=memchr(nm->name,0,nm->len);
+ if (!nul) {
+ buffer_readonly_view(&nm->extrainfo,0,0);
+ } else {
+ buffer_readonly_view(&nm->extrainfo, nul+1, msg->start-(nul+1));
+ nm->len=nul-nm->name;
+ }
return True;
}
static bool_t unpick_msg(struct site *st, uint32_t type,
struct buffer_if *msg, struct msg *m)
{
+ m->capab_transformnum=-1;
m->hashstart=msg->start;
CHECK_AVAIL(msg,4);
m->dest=buf_unprepend_uint32(msg);
CHECK_AVAIL(msg,4);
m->source=buf_unprepend_uint32(msg);
CHECK_TYPE(msg,type);
- CHECK_AVAIL(msg,2);
- m->remlen=buf_unprepend_uint16(msg);
- CHECK_AVAIL(msg,m->remlen);
- m->remote=buf_unprepend(msg,m->remlen);
- CHECK_AVAIL(msg,2);
- m->loclen=buf_unprepend_uint16(msg);
- CHECK_AVAIL(msg,m->loclen);
- m->local=buf_unprepend(msg,m->loclen);
+ if (!unpick_name(msg,&m->remote)) return False;
+ m->remote_capabilities=0;
+ if (m->remote.extrainfo.size) {
+ CHECK_AVAIL(&m->remote.extrainfo,4);
+ m->remote_capabilities=buf_unprepend_uint32(&m->remote.extrainfo);
+ }
+ if (!unpick_name(msg,&m->local)) return False;
+ if (type==LABEL_PROD) {
+ CHECK_EMPTY(msg);
+ return True;
+ }
CHECK_AVAIL(msg,NONCELEN);
m->nR=buf_unprepend(msg,NONCELEN);
if (type==LABEL_MSG1) {
CHECK_EMPTY(msg);
return True;
}
+ if (type==LABEL_MSG3BIS) {
+ CHECK_AVAIL(msg,1);
+ m->capab_transformnum = buf_unprepend_uint8(msg);
+ } else {
+ m->capab_transformnum = CAPAB_TRANSFORMNUM_ANCIENT;
+ }
CHECK_AVAIL(msg,2);
m->pklen=buf_unprepend_uint16(msg);
CHECK_AVAIL(msg,m->pklen);
return True;
}
+static bool_t name_matches(const struct parsedname *nm, const char *expected)
+{
+ int expected_len=strlen(expected);
+ return
+ nm->len == expected_len &&
+ !memcmp(nm->name, expected, expected_len);
+}
+
+static bool_t check_msg(struct site *st, uint32_t type, struct msg *m,
+ cstring_t *error)
+{
+ if (type==LABEL_MSG1) return True;
+
+ /* Check that the site names and our nonce have been sent
+ back correctly, and then store our peer's nonce. */
+ if (!name_matches(&m->remote,st->remotename)) {
+ *error="wrong remote site name";
+ return False;
+ }
+ if (!name_matches(&m->local,st->localname)) {
+ *error="wrong local site name";
+ return False;
+ }
+ if (memcmp(m->nL,st->localN,NONCELEN)!=0) {
+ *error="wrong locally-generated nonce";
+ return False;
+ }
+ if (type==LABEL_MSG2) return True;
+ if (!consttime_memeq(m->nR,st->remoteN,NONCELEN)!=0) {
+ *error="wrong remotely-generated nonce";
+ return False;
+ }
+ /* MSG3 has complicated rules about capabilities, which are
+ * handled in process_msg3. */
+ if (type==LABEL_MSG3 || type==LABEL_MSG3BIS) return True;
+ if (m->remote_capabilities!=st->remote_capabilities) {
+ *error="remote capabilities changed";
+ return False;
+ }
+ if (type==LABEL_MSG4) return True;
+ *error="unknown message type";
+ return False;
+}
+
static bool_t generate_msg1(struct site *st)
{
st->random->generate(st->random->st,NONCELEN,st->localN);
}
static bool_t process_msg1(struct site *st, struct buffer_if *msg1,
- struct sockaddr_in *src)
+ const struct comm_addr *src, struct msg *m)
{
- struct msg m;
-
/* We've already determined we're in an appropriate state to
process an incoming MSG1, and that the MSG1 has correct values
of A and B. */
- if (!unpick_msg(st,LABEL_MSG1,msg1,&m)) return False;
-
- /* XXX save src as our peer address here? */
- st->setup_peer=*src;
-
- st->setup_session_id=m.source;
- memcpy(st->remoteN,m.nR,NONCELEN);
+ transport_record_peer(st,&st->setup_peers,src,"msg1");
+ st->setup_session_id=m->source;
+ st->remote_capabilities=m->remote_capabilities;
+ memcpy(st->remoteN,m->nR,NONCELEN);
return True;
}
}
static bool_t process_msg2(struct site *st, struct buffer_if *msg2,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg m;
+ cstring_t err;
if (!unpick_msg(st,LABEL_MSG2,msg2,&m)) return False;
-
- /* Check that the site names and our nonce have been sent
- back correctly, and then store our peer's nonce. */
- if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) {
- slog(st,LOG_SEC,"msg2: bad B (remote site name)");
- return False;
- }
- if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) {
- slog(st,LOG_SEC,"msg2: bad A (local site name)");
- return False;
- }
- if (memcmp(m.nL,st->localN,NONCELEN)!=0) {
- slog(st,LOG_SEC,"msg2: bad nA (locally generated nonce)");
+ if (!check_msg(st,LABEL_MSG2,&m,&err)) {
+ slog(st,LOG_SEC,"msg2: %s",err);
return False;
}
st->setup_session_id=m.source;
+ st->remote_capabilities=m.remote_capabilities;
+
+ /* Select the transform to use */
+
+ uint32_t remote_transforms = st->remote_capabilities & CAPAB_TRANSFORM_MASK;
+ if (!remote_transforms)
+ /* old secnets only had this one transform */
+ remote_transforms = 1UL << CAPAB_TRANSFORMNUM_ANCIENT;
+
+ struct transform_if *ti;
+ int i;
+ for (i=0; i<st->ntransforms; i++) {
+ ti=st->transforms[i];
+ if ((1UL << ti->capab_transformnum) & remote_transforms)
+ goto transform_found;
+ }
+ slog(st,LOG_ERROR,"no transforms in common"
+ " (us %#"PRIx32"; them: %#"PRIx32")",
+ st->local_capabilities & CAPAB_TRANSFORM_MASK,
+ remote_transforms);
+ return False;
+ transform_found:
+ st->chosen_transform=ti;
+
memcpy(st->remoteN,m.nR,NONCELEN);
return True;
}
/* Now we have our nonce and their nonce. Think of a secret key,
and create message number 3. */
st->random->generate(st->random->st,st->dh->len,st->dhsecret);
- return generate_msg(st,LABEL_MSG3,"site:MSG3");
+ return generate_msg(st,
+ (st->remote_capabilities & CAPAB_TRANSFORM_MASK
+ ? LABEL_MSG3BIS : LABEL_MSG3),
+ "site:MSG3");
}
static bool_t process_msg3(struct site *st, struct buffer_if *msg3,
- struct sockaddr_in *src)
+ const struct comm_addr *src, uint32_t msgtype)
{
struct msg m;
- uint8_t *hash=alloca(st->hash->len);
+ uint8_t *hash;
void *hst;
+ cstring_t err;
- if (!unpick_msg(st,LABEL_MSG3,msg3,&m)) return False;
+ assert(msgtype==LABEL_MSG3 || msgtype==LABEL_MSG3BIS);
- /* Check that the site names and nonces have been sent back
- correctly */
- if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) {
- slog(st,LOG_SEC,"msg3: bad A (remote site name)");
- return False;
- }
- if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) {
- slog(st,LOG_SEC,"msg3: bad B (local site name)");
+ if (!unpick_msg(st,msgtype,msg3,&m)) return False;
+ if (!check_msg(st,msgtype,&m,&err)) {
+ slog(st,LOG_SEC,"msg3: %s",err);
return False;
}
- if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) {
- slog(st,LOG_SEC,"msg3: bad nA (remotely generated nonce)");
+ uint32_t capab_adv_late = m.remote_capabilities
+ & ~st->remote_capabilities & CAPAB_EARLY;
+ if (capab_adv_late) {
+ slog(st,LOG_SEC,"msg3 impermissibly adds early capability flag(s)"
+ " %#"PRIx32" (was %#"PRIx32", now %#"PRIx32")",
+ capab_adv_late, st->remote_capabilities, m.remote_capabilities);
return False;
}
- if (memcmp(m.nL,st->localN,NONCELEN)!=0) {
- slog(st,LOG_SEC,"msg3: bad nB (locally generated nonce)");
- return False;
+ st->remote_capabilities|=m.remote_capabilities;
+
+ struct transform_if *ti;
+ int i;
+ for (i=0; i<st->ntransforms; i++) {
+ ti=st->transforms[i];
+ if (ti->capab_transformnum == m.capab_transformnum)
+ goto transform_found;
}
-
+ slog(st,LOG_SEC,"peer chose unknown-to-us transform %d!",
+ m.capab_transformnum);
+ return False;
+ transform_found:
+ st->chosen_transform=ti;
+
/* Check signature and store g^x mod m */
+ hash=safe_malloc(st->hash->len, "process_msg3");
hst=st->hash->init();
st->hash->update(hst,m.hashstart,m.hashlen);
st->hash->final(hst,hash);
m.sig[m.siglen]=0;
if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
slog(st,LOG_SEC,"msg3 signature failed check!");
+ free(hash);
return False;
}
+ free(hash);
/* Terminate their DH public key with a '0' */
m.pk[m.pklen]=0;
/* Invent our DH secret key */
st->random->generate(st->random->st,st->dh->len,st->dhsecret);
- /* Generate the shared key */
- st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
- st->sharedsecret,st->transform->keylen);
-
- /* Set up the transform */
- st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
- st->transform->keylen);
+ /* Generate the shared key and set up the transform */
+ set_new_transform(st,m.pk);
return True;
}
}
static bool_t process_msg4(struct site *st, struct buffer_if *msg4,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg m;
- uint8_t *hash=alloca(st->hash->len);
+ uint8_t *hash;
void *hst;
+ cstring_t err;
if (!unpick_msg(st,LABEL_MSG4,msg4,&m)) return False;
-
- /* Check that the site names and nonces have been sent back
- correctly */
- if (memcmp(m.remote,st->remotename,strlen(st->remotename)!=0)) {
- slog(st,LOG_SEC,"msg4: bad B (remote site name)");
- return False;
- }
- if (memcmp(m.local,st->localname,strlen(st->localname)!=0)) {
- slog(st,LOG_SEC,"msg4: bad A (local site name)");
- return False;
- }
- if (memcmp(m.nR,st->remoteN,NONCELEN)!=0) {
- slog(st,LOG_SEC,"msg4: bad nB (remotely generated nonce)");
- return False;
- }
- if (memcmp(m.nL,st->localN,NONCELEN)!=0) {
- slog(st,LOG_SEC,"msg4: bad nA (locally generated nonce)");
+ if (!check_msg(st,LABEL_MSG4,&m,&err)) {
+ slog(st,LOG_SEC,"msg4: %s",err);
return False;
}
/* Check signature and store g^x mod m */
+ hash=safe_malloc(st->hash->len, "process_msg4");
hst=st->hash->init();
st->hash->update(hst,m.hashstart,m.hashlen);
st->hash->final(hst,hash);
m.sig[m.siglen]=0;
if (!st->pubkey->check(st->pubkey->st,hash,st->hash->len,m.sig)) {
slog(st,LOG_SEC,"msg4 signature failed check!");
+ free(hash);
return False;
}
+ free(hash);
/* Terminate their DH public key with a '0' */
m.pk[m.pklen]=0;
- /* Generate the shared key */
- st->dh->makeshared(st->dh->st,st->dhsecret,st->dh->len,m.pk,
- st->sharedsecret,st->transform->keylen);
- /* Set up the transform */
- st->new_transform->setkey(st->new_transform->st,st->sharedsecret,
- st->transform->keylen);
- return True;
-}
+ /* Generate the shared key and set up the transform */
+ set_new_transform(st,m.pk);
-static bool_t generate_msg5(struct site *st)
-{
- string_t transform_err;
-
- BUF_ALLOC(&st->buffer,"site:MSG5");
- /* We are going to add three words to the transformed message */
- buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
- buf_append_uint32(&st->buffer,LABEL_MSG5);
- st->new_transform->forwards(st->new_transform->st,&st->buffer,
- &transform_err);
- buf_prepend_uint32(&st->buffer,LABEL_MSG5);
- buf_prepend_uint32(&st->buffer,(uint32_t)st);
- buf_prepend_uint32(&st->buffer,st->setup_session_id);
-
- st->retries=st->setup_retries;
return True;
}
/* Leaves transformed part of buffer untouched */
}
+static bool_t generate_msg5(struct site *st)
+{
+ cstring_t transform_err;
+
+ BUF_ALLOC(&st->buffer,"site:MSG5");
+ /* We are going to add four words to the message */
+ buffer_init(&st->buffer,calculate_max_start_pad());
+ /* Give the netlink code an opportunity to put its own stuff in the
+ message (configuration information, etc.) */
+ buf_prepend_uint32(&st->buffer,LABEL_MSG5);
+ if (call_transform_forwards(st,st->new_transform,
+ &st->buffer,&transform_err))
+ return False;
+ buf_prepend_uint32(&st->buffer,LABEL_MSG5);
+ buf_prepend_uint32(&st->buffer,st->index);
+ buf_prepend_uint32(&st->buffer,st->setup_session_id);
+
+ st->retries=st->setup_retries;
+ return True;
+}
+
static bool_t process_msg5(struct site *st, struct buffer_if *msg5,
- struct sockaddr_in *src)
+ const struct comm_addr *src,
+ struct transform_inst_if *transform)
{
struct msg0 m;
- string_t transform_err;
+ cstring_t transform_err;
if (!unpick_msg0(st,msg5,&m)) return False;
- if (st->new_transform->reverse(st->new_transform->st,
- msg5,&transform_err)) {
+ if (call_transform_reverse(st,transform,msg5,&transform_err)) {
/* There's a problem */
slog(st,LOG_SEC,"process_msg5: transform: %s",transform_err);
return False;
/* Buffer should now contain untransformed PING packet data */
CHECK_AVAIL(msg5,4);
if (buf_unprepend_uint32(msg5)!=LABEL_MSG5) {
- slog(st,LOG_SEC,"MSG5/PING packet contained invalid data");
+ slog(st,LOG_SEC,"MSG5/PING packet contained wrong label");
return False;
}
- CHECK_EMPTY(msg5);
+ /* Older versions of secnet used to write some config data here
+ * which we ignore. So we don't CHECK_EMPTY */
return True;
}
-static bool_t generate_msg6(struct site *st)
+static void create_msg6(struct site *st, struct transform_inst_if *transform,
+ uint32_t session_id)
{
- string_t transform_err;
+ cstring_t transform_err;
BUF_ALLOC(&st->buffer,"site:MSG6");
- /* We are going to add three words to the transformed message */
- buffer_init(&st->buffer,st->transform->max_start_pad+(4*3));
- buf_append_uint32(&st->buffer,LABEL_MSG6);
- st->new_transform->forwards(st->new_transform->st,&st->buffer,
- &transform_err);
+ /* We are going to add four words to the message */
+ buffer_init(&st->buffer,calculate_max_start_pad());
+ /* Give the netlink code an opportunity to put its own stuff in the
+ message (configuration information, etc.) */
buf_prepend_uint32(&st->buffer,LABEL_MSG6);
- buf_prepend_uint32(&st->buffer,(uint32_t)st);
- buf_prepend_uint32(&st->buffer,st->setup_session_id);
+ int problem = call_transform_forwards(st,transform,
+ &st->buffer,&transform_err);
+ assert(!problem);
+ buf_prepend_uint32(&st->buffer,LABEL_MSG6);
+ buf_prepend_uint32(&st->buffer,st->index);
+ buf_prepend_uint32(&st->buffer,session_id);
+}
- st->retries=1; /* Peer will retransmit MSG5 if necessary */
+static bool_t generate_msg6(struct site *st)
+{
+ if (!is_transform_valid(st->new_transform))
+ return False;
+ create_msg6(st,st->new_transform,st->setup_session_id);
+ st->retries=1; /* Peer will retransmit MSG5 if this packet gets lost */
return True;
}
static bool_t process_msg6(struct site *st, struct buffer_if *msg6,
- struct sockaddr_in *src)
+ const struct comm_addr *src)
{
struct msg0 m;
- string_t transform_err;
+ cstring_t transform_err;
if (!unpick_msg0(st,msg6,&m)) return False;
- if (st->new_transform->reverse(st->new_transform->st,
- msg6,&transform_err)) {
+ if (call_transform_reverse(st,st->new_transform,msg6,&transform_err)) {
/* There's a problem */
slog(st,LOG_SEC,"process_msg6: transform: %s",transform_err);
return False;
slog(st,LOG_SEC,"MSG6/PONG packet contained invalid data");
return False;
}
- CHECK_EMPTY(msg6);
+ /* Older versions of secnet used to write some config data here
+ * which we ignore. So we don't CHECK_EMPTY */
return True;
}
-static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
- struct sockaddr_in *src)
+static bool_t decrypt_msg0(struct site *st, struct buffer_if *msg0,
+ const struct comm_addr *src)
{
+ cstring_t transform_err, auxkey_err, newkey_err="n/a";
struct msg0 m;
- string_t transform_err;
- uint32_t type;
+ uint32_t problem;
+
+ if (!unpick_msg0(st,msg0,&m)) return False;
+
+ /* Keep a copy so we can try decrypting it with multiple keys */
+ buffer_copy(&st->scratch, msg0);
- if (!st->current_valid) {
- slog(st,LOG_DROP,"incoming message but no current key -> dropping");
- if (st->state==SITE_RUN) {
- slog(st,LOG_SETUP_INIT|LOG_STATE,
- "now initiating setup of new key");
- return enter_state_resolve(st);
+ problem = call_transform_reverse(st,st->current.transform,
+ msg0,&transform_err);
+ if (!problem) {
+ if (!st->auxiliary_is_new)
+ delete_one_key(st,&st->auxiliary_key,
+ "peer has used new key","auxiliary key",LOG_SEC);
+ return True;
+ }
+ if (problem==2)
+ goto skew;
+
+ buffer_copy(msg0, &st->scratch);
+ problem = call_transform_reverse(st,st->auxiliary_key.transform,
+ msg0,&auxkey_err);
+ if (problem==0) {
+ slog(st,LOG_DROP,"processing packet which uses auxiliary key");
+ if (st->auxiliary_is_new) {
+ /* We previously timed out in state SENTMSG5 but it turns
+ * out that our peer did in fact get our MSG5 and is
+ * using the new key. So we should switch to it too. */
+ /* This is a bit like activate_new_key. */
+ struct data_key t;
+ t=st->current;
+ st->current=st->auxiliary_key;
+ st->auxiliary_key=t;
+
+ delete_one_key(st,&st->auxiliary_key,"peer has used new key",
+ "previous key",LOG_SEC);
+ st->auxiliary_is_new=0;
+ st->renegotiate_key_time=st->auxiliary_renegotiate_key_time;
}
- return False;
+ return True;
+ }
+ if (problem==2)
+ goto skew;
+
+ if (st->state==SITE_SENTMSG5) {
+ buffer_copy(msg0, &st->scratch);
+ problem = call_transform_reverse(st,st->new_transform,
+ msg0,&newkey_err);
+ if (!problem) {
+ /* It looks like we didn't get the peer's MSG6 */
+ /* This is like a cut-down enter_new_state(SITE_RUN) */
+ slog(st,LOG_STATE,"will enter state RUN (MSG0 with new key)");
+ BUF_FREE(&st->buffer);
+ st->timeout=0;
+ activate_new_key(st);
+ return True; /* do process the data in this packet */
+ }
+ if (problem==2)
+ goto skew;
}
- if (!unpick_msg0(st,msg0,&m)) return False;
+ slog(st,LOG_SEC,"transform: %s (aux: %s, new: %s)",
+ transform_err,auxkey_err,newkey_err);
+ initiate_key_setup(st,"incoming message would not decrypt",0);
+ send_nak(src,m.dest,m.source,m.type,msg0,"message would not decrypt");
+ return False;
- if (st->current_transform->reverse(st->current_transform->st,
- msg0,&transform_err)) {
- /* There's a problem */
- slog(st,LOG_SEC,"transform: %s",transform_err);
+ skew:
+ slog(st,LOG_DROP,"transform: %s (merely skew)",transform_err);
+ return False;
+}
+
+static bool_t process_msg0(struct site *st, struct buffer_if *msg0,
+ const struct comm_addr *src)
+{
+ uint32_t type;
+
+ if (!decrypt_msg0(st,msg0,src))
return False;
- }
+
CHECK_AVAIL(msg0,4);
type=buf_unprepend_uint32(msg0);
switch(type) {
+ case LABEL_MSG7:
+ /* We must forget about the current session. */
+ delete_keys(st,"request from peer",LOG_SEC);
+ return True;
case LABEL_MSG9:
/* Deliver to netlink layer */
- st->netlink->deliver(st->netlink->st,st->netlink_cid,msg0);
+ st->netlink->deliver(st->netlink->st,msg0);
+ transport_data_msgok(st,src);
+ /* See whether we should start negotiating a new key */
+ if (st->now > st->renegotiate_key_time)
+ initiate_key_setup(st,"incoming packet in renegotiation window",0);
return True;
- break;
default:
- slog(st,LOG_SEC,"incoming message of type %08x (unknown)",type);
+ slog(st,LOG_SEC,"incoming encrypted message of type %08x "
+ "(unknown)",type);
break;
}
return False;
}
static void dump_packet(struct site *st, struct buffer_if *buf,
- struct sockaddr_in *addr, bool_t incoming)
+ const struct comm_addr *addr, bool_t incoming)
{
- uint32_t dest=ntohl(*(uint32_t *)buf->start);
- uint32_t source=ntohl(*(uint32_t *)(buf->start+4));
- uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
+ uint32_t dest=get_uint32(buf->start);
+ uint32_t source=get_uint32(buf->start+4);
+ uint32_t msgtype=get_uint32(buf->start+8);
if (st->log_events & LOG_DUMP)
- log(st->log,0,"(%s,%s): %s: %08x<-%08x: %08x:",
- st->localname,st->remotename,incoming?"incoming":"outgoing",
- dest,source,msgtype);
+ slilog(st->log,M_DEBUG,"%s: %s: %08x<-%08x: %08x:",
+ st->tunname,incoming?"incoming":"outgoing",
+ dest,source,msgtype);
}
static uint32_t site_status(void *st)
static bool_t send_msg(struct site *st)
{
if (st->retries>0) {
- dump_packet(st,&st->buffer,&st->setup_peer,False);
- st->comm->sendmsg(st->comm->st,&st->buffer,&st->setup_peer);
- st->timeout=st->now+st->setup_timeout;
+ transport_xmit(st, &st->setup_peers, &st->buffer, True);
+ st->timeout=st->now+st->setup_retry_interval;
st->retries--;
return True;
+ } else if (st->state==SITE_SENTMSG5) {
+ slog(st,LOG_SETUP_TIMEOUT,"timed out sending MSG5, stashing new key");
+ /* We stash the key we have produced, in case it turns out that
+ * our peer did see our MSG5 after all and starts using it. */
+ /* This is a bit like some of activate_new_key */
+ struct transform_inst_if *t;
+ t=st->auxiliary_key.transform;
+ st->auxiliary_key.transform=st->new_transform;
+ st->new_transform=t;
+ dispose_transform(&st->new_transform);
+
+ st->auxiliary_is_new=1;
+ st->auxiliary_key.key_timeout=st->now+st->key_lifetime;
+ st->auxiliary_renegotiate_key_time=st->now+st->key_renegotiate_time;
+ st->auxiliary_key.remote_session_id=st->setup_session_id;
+
+ enter_state_wait(st);
+ return False;
} else {
- slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet");
+ slog(st,LOG_SETUP_TIMEOUT,"timed out sending key setup packet "
+ "(in state %s)",state_name(st->state));
enter_state_wait(st);
return False;
}
static void site_resolve_callback(void *sst, struct in_addr *address)
{
struct site *st=sst;
+ struct comm_addr ca_buf, *ca_use;
if (st->state!=SITE_RESOLVE) {
slog(st,LOG_UNEXPECTED,"site_resolve_callback called unexpectedly");
return;
}
if (address) {
- memset(&st->setup_peer,0,sizeof(st->setup_peer));
- st->setup_peer.sin_family=AF_INET;
- st->setup_peer.sin_port=htons(st->remoteport);
- st->setup_peer.sin_addr=*address;
- enter_state_sentmsg1(st);
+ FILLZERO(ca_buf);
+ ca_buf.comm=st->comms[0];
+ ca_buf.sin.sin_family=AF_INET;
+ ca_buf.sin.sin_port=htons(st->remoteport);
+ ca_buf.sin.sin_addr=*address;
+ ca_use=&ca_buf;
} else {
- /* Resolution failed */
slog(st,LOG_ERROR,"resolution of %s failed",st->address);
+ ca_use=0;
+ }
+ if (transport_compute_setupinit_peers(st,ca_use,0)) {
+ enter_new_state(st,SITE_SENTMSG1);
+ } else {
+ /* Can't figure out who to try to to talk to */
+ slog(st,LOG_SETUP_INIT,"key exchange failed: cannot find peer address");
enter_state_run(st);
}
}
+static bool_t initiate_key_setup(struct site *st, cstring_t reason,
+ const struct comm_addr *prod_hint)
+{
+ if (st->state!=SITE_RUN) return False;
+ slog(st,LOG_SETUP_INIT,"initiating key exchange (%s)",reason);
+ if (st->address) {
+ slog(st,LOG_SETUP_INIT,"resolving peer address");
+ return enter_state_resolve(st);
+ } else if (transport_compute_setupinit_peers(st,0,prod_hint)) {
+ return enter_new_state(st,SITE_SENTMSG1);
+ }
+ slog(st,LOG_SETUP_INIT,"key exchange failed: no address for peer");
+ return False;
+}
+
static void activate_new_key(struct site *st)
{
struct transform_inst_if *t;
- t=st->current_transform;
- st->current_transform=st->new_transform;
+ /* We have three transform instances, which we swap between old,
+ active and setup */
+ t=st->auxiliary_key.transform;
+ st->auxiliary_key.transform=st->current.transform;
+ st->current.transform=st->new_transform;
st->new_transform=t;
+ dispose_transform(&st->new_transform);
- t->delkey(t->st);
- st->state=SITE_RUN;
st->timeout=0;
- st->current_valid=True;
- st->current_key_timeout=st->now+st->key_lifetime;
- st->peer=st->setup_peer;
- st->peer_valid=True;
- st->remote_session_id=st->setup_session_id;
+ st->auxiliary_is_new=0;
+ st->auxiliary_key.key_timeout=st->current.key_timeout;
+ st->current.key_timeout=st->now+st->key_lifetime;
+ st->renegotiate_key_time=st->now+st->key_renegotiate_time;
+ transport_peers_copy(st,&st->peers,&st->setup_peers);
+ st->current.remote_session_id=st->setup_session_id;
slog(st,LOG_ACTIVATE_KEY,"new key activated");
+ enter_state_run(st);
+}
+
+static void delete_one_key(struct site *st, struct data_key *key,
+ cstring_t reason, cstring_t which, uint32_t loglevel)
+{
+ if (!is_transform_valid(key->transform)) return;
+ if (reason) slog(st,loglevel,"%s deleted (%s)",which,reason);
+ dispose_transform(&key->transform);
+ key->key_timeout=0;
+}
+
+static void delete_keys(struct site *st, cstring_t reason, uint32_t loglevel)
+{
+ if (current_valid(st)) {
+ slog(st,loglevel,"session closed (%s)",reason);
+
+ delete_one_key(st,&st->current,0,0,0);
+ set_link_quality(st);
+ }
+ delete_one_key(st,&st->auxiliary_key,0,0,0);
}
static void state_assert(struct site *st, bool_t ok)
{
- if (!ok) fatal("state_assert\n");
+ if (!ok) fatal("site:state_assert");
}
static void enter_state_stop(struct site *st)
{
st->state=SITE_STOP;
st->timeout=0;
- st->current_transform->delkey(st->current_transform->st);
- st->current_valid=False;
- st->current_key_timeout=0;
-
- st->peer_valid=False;
-
- st->new_transform->delkey(st->new_transform->st);
+ delete_keys(st,"entering state STOP",LOG_TIMEOUT_KEY);
+ dispose_transform(&st->new_transform);
+}
+
+static void set_link_quality(struct site *st)
+{
+ uint32_t quality;
+ if (current_valid(st))
+ quality=LINK_QUALITY_UP;
+ else if (st->state==SITE_WAIT || st->state==SITE_STOP)
+ quality=LINK_QUALITY_DOWN;
+ else if (st->address)
+ quality=LINK_QUALITY_DOWN_CURRENT_ADDRESS;
+ else if (transport_peers_valid(&st->peers))
+ quality=LINK_QUALITY_DOWN_STALE_ADDRESS;
+ else
+ quality=LINK_QUALITY_DOWN;
+
+ st->netlink->set_quality(st->netlink->st,quality);
}
static void enter_state_run(struct site *st)
slog(st,LOG_STATE,"entering state RUN");
st->state=SITE_RUN;
st->timeout=0;
- st->netlink->set_delivery(st->netlink->st,st->netlink_cid,True);
- /* XXX get rid of key setup data */
+
+ st->setup_session_id=0;
+ transport_peers_clear(st,&st->setup_peers);
+ memset(st->localN,0,NONCELEN);
+ memset(st->remoteN,0,NONCELEN);
+ dispose_transform(&st->new_transform);
+ memset(st->dhsecret,0,st->dh->len);
+ memset(st->sharedsecret,0,st->sharedsecretlen);
+ set_link_quality(st);
}
static bool_t enter_state_resolve(struct site *st)
return True;
}
-static bool_t enter_state_sentmsg1(struct site *st)
+static bool_t enter_new_state(struct site *st, uint32_t next)
{
- state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
- slog(st,LOG_STATE,"entering state SENTMSG1");
- if (generate_msg1(st) && send_msg(st)) {
- st->state=SITE_SENTMSG1;
- return True;
- }
- slog(st,LOG_ERROR,"error entering state SENTMSG1");
- st->buffer.free=False; /* Can't tell which it was, but enter_state_wait()
- will do a BUF_FREE() */
- enter_state_wait(st);
- return False;
-}
-
-static bool_t enter_state_sentmsg2(struct site *st)
-{
- state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
- st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
- slog(st,LOG_STATE,"entering state SENTMSG2");
- if (generate_msg2(st) && send_msg(st)) {
- st->state=SITE_SENTMSG2;
- return True;
- }
- slog(st,LOG_ERROR,"error entering state SENTMSG2");
- st->buffer.free=False;
- enter_state_wait(st);
- return False;
-}
-
-static bool_t enter_state_sentmsg3(struct site *st)
-{
- state_assert(st,st->state==SITE_SENTMSG1);
- slog(st,LOG_STATE,"entering state SENTMSG3");
- BUF_FREE(&st->buffer); /* Free message 1 */
- if (generate_msg3(st) && send_msg(st)) {
- st->state=SITE_SENTMSG3;
- return True;
+ bool_t (*gen)(struct site *st);
+ int r;
+
+ slog(st,LOG_STATE,"entering state %s",state_name(next));
+ switch(next) {
+ case SITE_SENTMSG1:
+ state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE);
+ gen=generate_msg1;
+ break;
+ case SITE_SENTMSG2:
+ state_assert(st,st->state==SITE_RUN || st->state==SITE_RESOLVE ||
+ st->state==SITE_SENTMSG1 || st->state==SITE_WAIT);
+ gen=generate_msg2;
+ break;
+ case SITE_SENTMSG3:
+ state_assert(st,st->state==SITE_SENTMSG1);
+ BUF_FREE(&st->buffer);
+ gen=generate_msg3;
+ break;
+ case SITE_SENTMSG4:
+ state_assert(st,st->state==SITE_SENTMSG2);
+ BUF_FREE(&st->buffer);
+ gen=generate_msg4;
+ break;
+ case SITE_SENTMSG5:
+ state_assert(st,st->state==SITE_SENTMSG3);
+ BUF_FREE(&st->buffer);
+ gen=generate_msg5;
+ break;
+ case SITE_RUN:
+ state_assert(st,st->state==SITE_SENTMSG4);
+ BUF_FREE(&st->buffer);
+ gen=generate_msg6;
+ break;
+ default:
+ gen=NULL;
+ fatal("enter_new_state(%s): invalid new state",state_name(next));
+ break;
}
- slog(st,LOG_ERROR,"error entering state SENTMSG3");
- st->buffer.free=False;
- enter_state_wait(st);
- return False;
-}
-static bool_t enter_state_sentmsg4(struct site *st)
-{
- state_assert(st,st->state==SITE_SENTMSG2);
- slog(st,LOG_STATE,"entering state SENTMSG4");
- BUF_FREE(&st->buffer); /* Free message 2 */
- if (generate_msg4(st) && send_msg(st)) {
- st->state=SITE_SENTMSG4;
- return True;
- }
- slog(st,LOG_ERROR,"error entering state SENTMSG4");
- st->buffer.free=False;
- enter_state_wait(st);
- return False;
-}
+ if (hacky_par_start_failnow()) return False;
-static bool_t enter_state_sentmsg5(struct site *st)
-{
- state_assert(st,st->state==SITE_SENTMSG3);
- slog(st,LOG_STATE,"entering state SENTMSG5");
- BUF_FREE(&st->buffer); /* Free message 3 */
+ r= gen(st) && send_msg(st);
- if (generate_msg5(st) && send_msg(st)) {
- st->state=SITE_SENTMSG5;
+ hacky_par_end(&r,
+ st->setup_retries, st->setup_retry_interval,
+ send_msg, st);
+
+ if (r) {
+ st->state=next;
+ if (next==SITE_RUN) {
+ BUF_FREE(&st->buffer); /* Never reused */
+ st->timeout=0; /* Never retransmit */
+ activate_new_key(st);
+ }
return True;
}
- slog(st,LOG_ERROR,"error entering state SENTMSG5");
- st->buffer.free=False;
+ slog(st,LOG_ERROR,"error entering state %s",state_name(next));
+ st->buffer.free=False; /* Unconditionally use the buffer; it may be
+ in either state, and enter_state_wait() will
+ do a BUF_FREE() */
enter_state_wait(st);
-
return False;
}
-static bool_t send_msg6(struct site *st)
+/* msg7 tells our peer that we're about to forget our key */
+static bool_t send_msg7(struct site *st, cstring_t reason)
{
- state_assert(st,st->state==SITE_SENTMSG4);
- slog(st,LOG_STATE,"entering state RUN after sending msg6");
- BUF_FREE(&st->buffer); /* Free message 4 */
- if (generate_msg6(st) && send_msg(st)) {
- BUF_FREE(&st->buffer); /* Never reused */
- st->timeout=0; /* Never retransmit */
- activate_new_key(st);
+ cstring_t transform_err;
+
+ if (current_valid(st) && st->buffer.free
+ && transport_peers_valid(&st->peers)) {
+ BUF_ALLOC(&st->buffer,"site:MSG7");
+ buffer_init(&st->buffer,calculate_max_start_pad());
+ buf_append_uint32(&st->buffer,LABEL_MSG7);
+ buf_append_string(&st->buffer,reason);
+ if (call_transform_forwards(st, st->current.transform,
+ &st->buffer, &transform_err))
+ goto free_out;
+ buf_prepend_uint32(&st->buffer,LABEL_MSG0);
+ buf_prepend_uint32(&st->buffer,st->index);
+ buf_prepend_uint32(&st->buffer,st->current.remote_session_id);
+ transport_xmit(st,&st->peers,&st->buffer,True);
+ BUF_FREE(&st->buffer);
+ free_out:
return True;
}
- slog(st,LOG_ERROR,"error entering state RUN after sending msg6");
- st->buffer.free=False;
- enter_state_wait(st);
return False;
}
slog(st,LOG_STATE,"entering state WAIT");
st->timeout=st->now+st->wait_timeout;
st->state=SITE_WAIT;
- st->peer_valid=False;
- st->netlink->set_delivery(st->netlink->st,st->netlink_cid,False);
+ set_link_quality(st);
BUF_FREE(&st->buffer); /* will have had an outgoing packet in it */
/* XXX Erase keys etc. */
}
+static void generate_prod(struct site *st, struct buffer_if *buf)
+{
+ buffer_init(buf,0);
+ buf_append_uint32(buf,0);
+ buf_append_uint32(buf,0);
+ buf_append_uint32(buf,LABEL_PROD);
+ buf_append_string(buf,st->localname);
+ buf_append_string(buf,st->remotename);
+}
+
+static void generate_send_prod(struct site *st,
+ const struct comm_addr *source)
+{
+ if (!st->allow_send_prod) return; /* too soon */
+ if (!(st->state==SITE_RUN || st->state==SITE_RESOLVE ||
+ st->state==SITE_WAIT)) return; /* we'd ignore peer's MSG1 */
+
+ slog(st,LOG_SETUP_INIT,"prodding peer for key exchange");
+ st->allow_send_prod=0;
+ generate_prod(st,&st->scratch);
+ dump_packet(st,&st->scratch,source,False);
+ source->comm->sendmsg(source->comm->st, &st->scratch, source);
+}
+
+static inline void site_settimeout(uint64_t timeout, int *timeout_io)
+{
+ if (timeout) {
+ int64_t offset=timeout-*now;
+ if (offset<0) offset=0;
+ if (offset>INT_MAX) offset=INT_MAX;
+ if (*timeout_io<0 || offset<*timeout_io)
+ *timeout_io=offset;
+ }
+}
+
static int site_beforepoll(void *sst, struct pollfd *fds, int *nfds_io,
- int *timeout_io, const struct timeval *tv_now,
- uint64_t *now)
+ int *timeout_io)
{
struct site *st=sst;
st->now=*now;
/* Work out when our next timeout is. The earlier of 'timeout' or
- 'current_key_timeout'. A stored value of '0' indicates no timeout
+ 'current.key_timeout'. A stored value of '0' indicates no timeout
active. */
- if (st->timeout && st->timeout-*now < *timeout_io) {
- *timeout_io=st->timeout-*now;
- }
-
- if (st->current_key_timeout && st->current_key_timeout-*now < *timeout_io)
- *timeout_io=st->current_key_timeout-*now;
+ site_settimeout(st->timeout, timeout_io);
+ site_settimeout(st->current.key_timeout, timeout_io);
+ site_settimeout(st->auxiliary_key.key_timeout, timeout_io);
return 0; /* success */
}
+static void check_expiry(struct site *st, struct data_key *key,
+ const char *which)
+{
+ if (key->key_timeout && *now>key->key_timeout) {
+ delete_one_key(st,key,"maximum life exceeded",which,LOG_TIMEOUT_KEY);
+ }
+}
+
/* NB site_afterpoll will be called before site_beforepoll is ever called */
-static void site_afterpoll(void *sst, struct pollfd *fds, int nfds,
- const struct timeval *tv_now, uint64_t *now)
+static void site_afterpoll(void *sst, struct pollfd *fds, int nfds)
{
struct site *st=sst;
st->now=*now;
if (st->timeout && *now>st->timeout) {
- /* Do stuff */
st->timeout=0;
- if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5)
- send_msg(st);
- else if (st->state==SITE_WAIT) {
+ if (st->state>=SITE_SENTMSG1 && st->state<=SITE_SENTMSG5) {
+ if (!hacky_par_start_failnow())
+ send_msg(st);
+ } else if (st->state==SITE_WAIT) {
enter_state_run(st);
} else {
slog(st,LOG_ERROR,"site_afterpoll: unexpected timeout, state=%d",
st->state);
}
}
- if (st->current_key_timeout && *now>st->current_key_timeout) {
- slog(st,LOG_TIMEOUT_KEY,"maximum key life exceeded; session closed");
- st->current_valid=False;
- st->current_transform->delkey(st->current_transform->st);
- st->current_key_timeout=0;
- }
+ check_expiry(st,&st->current,"current key");
+ check_expiry(st,&st->auxiliary_key,"auxiliary key");
}
/* This function is called by the netlink device to deliver packets
intended for the remote network. The packet is in "raw" wire
format, but is guaranteed to be word-aligned. */
-static void site_outgoing(void *sst, void *cid, struct buffer_if *buf)
+static void site_outgoing(void *sst, struct buffer_if *buf)
{
struct site *st=sst;
- string_t transform_err;
+ cstring_t transform_err;
if (st->state==SITE_STOP) {
BUF_FREE(buf);
return;
}
+ st->allow_send_prod=1;
+
/* In all other states we consider delivering the packet if we have
a valid key and a valid address to send it to. */
- if (st->current_valid && st->peer_valid) {
+ if (current_valid(st) && transport_peers_valid(&st->peers)) {
/* Transform it and send it */
- buf_prepend_uint32(buf,LABEL_MSG9);
- st->current_transform->forwards(st->current_transform->st,
- buf, &transform_err);
- buf_prepend_uint32(buf,LABEL_MSG0);
- buf_prepend_uint32(buf,(uint32_t)st);
- buf_prepend_uint32(buf,st->remote_session_id);
- st->comm->sendmsg(st->comm->st,buf,&st->peer);
+ if (buf->size>0) {
+ buf_prepend_uint32(buf,LABEL_MSG9);
+ if (call_transform_forwards(st, st->current.transform,
+ buf, &transform_err))
+ goto free_out;
+ buf_prepend_uint32(buf,LABEL_MSG0);
+ buf_prepend_uint32(buf,st->index);
+ buf_prepend_uint32(buf,st->current.remote_session_id);
+ transport_xmit(st,&st->peers,buf,False);
+ }
+ free_out:
BUF_FREE(buf);
return;
}
- if (st->state==SITE_RUN) {
- BUF_FREE(buf); /* We throw the outgoing packet away */
- slog(st,LOG_SETUP_INIT,"initiating key exchange");
- enter_state_resolve(st);
- return;
- }
-
- /* Otherwise we're in the middle of key setup or a wait - just
- throw the outgoing packet away */
- slog(st,LOG_DROP,"discarding outgoing packet");
+ slog(st,LOG_DROP,"discarding outgoing packet of size %d",buf->size);
BUF_FREE(buf);
- return;
+ initiate_key_setup(st,"outgoing packet",0);
+}
+
+static bool_t named_for_us(struct site *st, const struct buffer_if *buf_in,
+ uint32_t type, struct msg *m)
+ /* For packets which are identified by the local and remote names.
+ * If it has our name and our peer's name in it it's for us. */
+{
+ struct buffer_if buf[1];
+ buffer_readonly_clone(buf,buf_in);
+ return unpick_msg(st,type,buf,m)
+ && name_matches(&m->remote,st->remotename)
+ && name_matches(&m->local,st->localname);
}
/* This function is called by the communication device to deliver
- packets from our peers. */
+ packets from our peers.
+ It should return True if the packet is recognised as being for
+ this current site instance (and should therefore not be processed
+ by other sites), even if the packet was otherwise ignored. */
static bool_t site_incoming(void *sst, struct buffer_if *buf,
- struct sockaddr_in *source)
+ const struct comm_addr *source)
{
struct site *st=sst;
- uint32_t dest=ntohl(*(uint32_t *)buf->start);
-
- if (dest==0) {
- if (buf->size<(st->setupsiglen+8+NONCELEN)) return False;
- /* It could be for any site - it should have LABEL_MSG1 and
- might have our name and our peer's name in it */
- if (memcmp(buf->start+8,st->setupsig,st->setupsiglen)==0) {
- dump_packet(st,buf,source,True);
- /* It's addressed to us. Decide what to do about it. */
- if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
- st->state==SITE_WAIT) {
- /* We should definitely process it */
- if (process_msg1(st,buf,source)) {
- slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
- enter_state_sentmsg2(st);
- } else {
- slog(st,LOG_ERROR,"failed to process incoming msg1");
- }
+
+ if (buf->size < 12) return False;
+
+ uint32_t dest=get_uint32(buf->start);
+ uint32_t msgtype=get_uint32(buf->start+8);
+ struct msg named_msg;
+
+ if (msgtype==LABEL_MSG1) {
+ if (!named_for_us(st,buf,msgtype,&named_msg))
+ return False;
+ /* It's a MSG1 addressed to us. Decide what to do about it. */
+ dump_packet(st,buf,source,True);
+ if (st->state==SITE_RUN || st->state==SITE_RESOLVE ||
+ st->state==SITE_WAIT) {
+ /* We should definitely process it */
+ if (process_msg1(st,buf,source,&named_msg)) {
+ slog(st,LOG_SETUP_INIT,"key setup initiated by peer");
+ enter_new_state(st,SITE_SENTMSG2);
+ } else {
+ slog(st,LOG_ERROR,"failed to process incoming msg1");
+ }
+ BUF_FREE(buf);
+ return True;
+ } else if (st->state==SITE_SENTMSG1) {
+ /* We've just sent a message 1! They may have crossed on
+ the wire. If we have priority then we ignore the
+ incoming one, otherwise we process it as usual. */
+ if (st->setup_priority) {
BUF_FREE(buf);
+ slog(st,LOG_DUMP,"crossed msg1s; we are higher "
+ "priority => ignore incoming msg1");
return True;
- }
- if (st->state==SITE_SENTMSG1) {
- /* We've just sent a message 1! They may have crossed on
- the wire. If we have priority then we ignore the
- incoming one, otherwise we process it as usual. */
- if (st->setup_priority) {
- BUF_FREE(buf);
- slog(st,LOG_DUMP,"crossed msg1s; we are higher "
- "priority => ignore incoming msg1");
- return True;
+ } else {
+ slog(st,LOG_DUMP,"crossed msg1s; we are lower "
+ "priority => use incoming msg1");
+ if (process_msg1(st,buf,source,&named_msg)) {
+ BUF_FREE(&st->buffer); /* Free our old message 1 */
+ enter_new_state(st,SITE_SENTMSG2);
} else {
- slog(st,LOG_DUMP,"crossed msg1s; we are lower "
- "priority => use incoming msg1");
- if (process_msg1(st,buf,source)) {
- BUF_FREE(&st->buffer); /* Free our old message 1 */
- enter_state_sentmsg2(st);
- } else {
- slog(st,LOG_ERROR,"failed to process an incoming "
- "crossed msg1 (we have low priority)");
- }
- BUF_FREE(buf);
- return True;
+ slog(st,LOG_ERROR,"failed to process an incoming "
+ "crossed msg1 (we have low priority)");
}
+ BUF_FREE(buf);
+ return True;
}
- /* The message 1 was received at an unexpected stage of the
- key setup. XXX POLICY - what do we do? */
- slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
- BUF_FREE(buf);
- return True;
}
- return False; /* Not for us. */
+ /* The message 1 was received at an unexpected stage of the
+ key setup. XXX POLICY - what do we do? */
+ slog(st,LOG_UNEXPECTED,"unexpected incoming message 1");
+ BUF_FREE(buf);
+ return True;
}
- if (dest==(uint32_t)st) {
- uint32_t msgtype=ntohl(*(uint32_t *)(buf->start+8));
+ if (msgtype==LABEL_PROD) {
+ if (!named_for_us(st,buf,msgtype,&named_msg))
+ return False;
+ dump_packet(st,buf,source,True);
+ if (st->state!=SITE_RUN) {
+ slog(st,LOG_DROP,"ignoring PROD when not in state RUN");
+ } else if (current_valid(st)) {
+ slog(st,LOG_DROP,"ignoring PROD when we think we have a key");
+ } else {
+ initiate_key_setup(st,"peer sent PROD packet",source);
+ }
+ BUF_FREE(buf);
+ return True;
+ }
+ if (dest==st->index) {
/* Explicitly addressed to us */
if (msgtype!=LABEL_MSG0) dump_packet(st,buf,source,True);
switch (msgtype) {
+ case LABEL_NAK:
+ /* If the source is our current peer then initiate a key setup,
+ because our peer's forgotten the key */
+ if (get_uint32(buf->start+4)==st->current.remote_session_id) {
+ bool_t initiated;
+ initiated = initiate_key_setup(st,"received a NAK",0);
+ if (!initiated) generate_send_prod(st,source);
+ } else {
+ slog(st,LOG_SEC,"bad incoming NAK");
+ }
+ break;
case LABEL_MSG0:
process_msg0(st,buf,source);
break;
/* Setup packet: expected only in state SENTMSG1 */
if (st->state!=SITE_SENTMSG1) {
slog(st,LOG_UNEXPECTED,"unexpected MSG2");
- } else if (process_msg2(st,buf,source))
- enter_state_sentmsg3(st);
- else {
+ } else if (process_msg2(st,buf,source)) {
+ transport_setup_msgok(st,source);
+ enter_new_state(st,SITE_SENTMSG3);
+ } else {
slog(st,LOG_SEC,"invalid MSG2");
}
break;
case LABEL_MSG3:
+ case LABEL_MSG3BIS:
/* Setup packet: expected only in state SENTMSG2 */
if (st->state!=SITE_SENTMSG2) {
slog(st,LOG_UNEXPECTED,"unexpected MSG3");
- } else if (process_msg3(st,buf,source))
- enter_state_sentmsg4(st);
- else {
+ } else if (process_msg3(st,buf,source,msgtype)) {
+ transport_setup_msgok(st,source);
+ enter_new_state(st,SITE_SENTMSG4);
+ } else {
slog(st,LOG_SEC,"invalid MSG3");
}
break;
/* Setup packet: expected only in state SENTMSG3 */
if (st->state!=SITE_SENTMSG3) {
slog(st,LOG_UNEXPECTED,"unexpected MSG4");
- } else if (process_msg4(st,buf,source))
- enter_state_sentmsg5(st);
- else {
+ } else if (process_msg4(st,buf,source)) {
+ transport_setup_msgok(st,source);
+ enter_new_state(st,SITE_SENTMSG5);
+ } else {
slog(st,LOG_SEC,"invalid MSG4");
}
break;
/* Setup packet: expected only in state SENTMSG4 */
/* (may turn up in state RUN if our return MSG6 was lost
and the new key has already been activated. In that
- case we should treat it as an ordinary PING packet. We
- can't pass it to process_msg5() because the
- new_transform will now be null. XXX) */
- if (st->state!=SITE_SENTMSG4) {
- slog(st,LOG_UNEXPECTED,"unexpected MSG5");
- } else if (process_msg5(st,buf,source)) {
- send_msg6(st);
+ case we discard it. The peer will realise that we
+ are using the new key when they see our data packets.
+ Until then the peer's data packets to us get discarded. */
+ if (st->state==SITE_SENTMSG4) {
+ if (process_msg5(st,buf,source,st->new_transform)) {
+ transport_setup_msgok(st,source);
+ enter_new_state(st,SITE_RUN);
+ } else {
+ slog(st,LOG_SEC,"invalid MSG5");
+ }
+ } else if (st->state==SITE_RUN) {
+ if (process_msg5(st,buf,source,st->current.transform)) {
+ slog(st,LOG_DROP,"got MSG5, retransmitting MSG6");
+ transport_setup_msgok(st,source);
+ create_msg6(st,st->current.transform,
+ st->current.remote_session_id);
+ transport_xmit(st,&st->peers,&st->buffer,True);
+ BUF_FREE(&st->buffer);
+ } else {
+ slog(st,LOG_SEC,"invalid MSG5 (in state RUN)");
+ }
} else {
- slog(st,LOG_SEC,"invalid MSG5");
+ slog(st,LOG_UNEXPECTED,"unexpected MSG5");
}
break;
case LABEL_MSG6:
slog(st,LOG_UNEXPECTED,"unexpected MSG6");
} else if (process_msg6(st,buf,source)) {
BUF_FREE(&st->buffer); /* Free message 5 */
+ transport_setup_msgok(st,source);
activate_new_key(st);
} else {
slog(st,LOG_SEC,"invalid MSG6");
}
break;
- case LABEL_MSG8:
- /* NAK packet: enter state where we ping and check for response */
- slog(st,LOG_ERROR,"received a NAK");
- break;
default:
slog(st,LOG_SEC,"received message of unknown type 0x%08x",
msgtype);
else enter_state_stop(st);
}
+static void site_phase_hook(void *sst, uint32_t newphase)
+{
+ struct site *st=sst;
+
+ /* The program is shutting down; tell our peer */
+ send_msg7(st,"shutting down");
+}
+
static list_t *site_apply(closure_t *self, struct cloc loc, dict_t *context,
list_t *args)
{
+ static uint32_t index_sequence;
struct site *st;
item_t *item;
dict_t *dict;
+ int i;
st=safe_malloc(sizeof(*st),"site_apply");
cfgfatal(loc,"site","parameter must be a dictionary\n");
dict=item->data.dict;
- st->netlink=find_cl_if(dict,"netlink",CL_NETLINK,True,"site",loc);
- st->comm=find_cl_if(dict,"comm",CL_COMM,True,"site",loc);
+ st->localname=dict_read_string(dict, "local-name", True, "site", loc);
+ st->remotename=dict_read_string(dict, "name", True, "site", loc);
+
+ st->peer_mobile=dict_read_bool(dict,"mobile",False,"site",loc,False);
+ bool_t local_mobile=
+ dict_read_bool(dict,"local-mobile",False,"site",loc,False);
+
+ /* Sanity check (which also allows the 'sites' file to include
+ site() closures for all sites including our own): refuse to
+ talk to ourselves */
+ if (strcmp(st->localname,st->remotename)==0) {
+ Message(M_DEBUG,"site %s: local-name==name -> ignoring this site\n",
+ st->localname);
+ if (st->peer_mobile != local_mobile)
+ cfgfatal(loc,"site","site %s's peer-mobile=%d"
+ " but our local-mobile=%d\n",
+ st->localname, st->peer_mobile, local_mobile);
+ free(st);
+ return NULL;
+ }
+ if (st->peer_mobile && local_mobile) {
+ Message(M_WARNING,"site %s: site is mobile but so are we"
+ " -> ignoring this site\n", st->remotename);
+ free(st);
+ return NULL;
+ }
+
+ assert(index_sequence < 0xffffffffUL);
+ st->index = ++index_sequence;
+ st->local_capabilities = 0;
+ st->netlink=find_cl_if(dict,"link",CL_NETLINK,True,"site",loc);
+
+#define GET_CLOSURE_LIST(dictkey,things,nthings,CL_TYPE) do{ \
+ list_t *things##_cfg=dict_lookup(dict,dictkey); \
+ if (!things##_cfg) \
+ cfgfatal(loc,"site","closure list \"%s\" not found\n",dictkey); \
+ st->nthings=list_length(things##_cfg); \
+ st->things=safe_malloc_ary(sizeof(*st->things),st->nthings,dictkey "s"); \
+ assert(st->nthings); \
+ for (i=0; i<st->nthings; i++) { \
+ item_t *item=list_elem(things##_cfg,i); \
+ if (item->type!=t_closure) \
+ cfgfatal(loc,"site","%s is not a closure\n",dictkey); \
+ closure_t *cl=item->data.closure; \
+ if (cl->type!=CL_TYPE) \
+ cfgfatal(loc,"site","%s closure wrong type\n",dictkey); \
+ st->things[i]=cl->interface; \
+ } \
+}while(0)
+
+ GET_CLOSURE_LIST("comm",comms,ncomms,CL_COMM);
+
st->resolver=find_cl_if(dict,"resolver",CL_RESOLVER,True,"site",loc);
st->log=find_cl_if(dict,"log",CL_LOG,True,"site",loc);
st->random=find_cl_if(dict,"random",CL_RANDOMSRC,True,"site",loc);
- st->localname=dict_read_string(dict, "local-name", True, "site", loc);
st->privkey=find_cl_if(dict,"local-key",CL_RSAPRIVKEY,True,"site",loc);
- st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
-
- st->remotename=dict_read_string(dict, "name", True, "site", loc);
st->address=dict_read_string(dict, "address", False, "site", loc);
- dict_read_subnet_list(dict, "networks", True, "site", loc,
- &st->remotenets);
+ if (st->address)
+ st->remoteport=dict_read_number(dict,"port",True,"site",loc,0);
+ else st->remoteport=0;
st->pubkey=find_cl_if(dict,"key",CL_RSAPUBKEY,True,"site",loc);
- st->transform=
- find_cl_if(dict,"transform",CL_TRANSFORM,True,"site",loc);
+ GET_CLOSURE_LIST("transform",transforms,ntransforms,CL_TRANSFORM);
st->dh=find_cl_if(dict,"dh",CL_DH,True,"site",loc);
st->hash=find_cl_if(dict,"hash",CL_HASH,True,"site",loc);
- st->key_lifetime=dict_read_number(dict,"key-lifetime",
- False,"site",loc,DEFAULT_KEY_LIFETIME);
- st->setup_retries=dict_read_number(dict,"setup-retries",
- False,"site",loc,DEFAULT_SETUP_RETRIES);
- st->setup_timeout=dict_read_number(dict,"setup-timeout",
- False,"site",loc,DEFAULT_SETUP_TIMEOUT);
- st->wait_timeout=dict_read_number(dict,"wait-time",
- False,"site",loc,DEFAULT_WAIT_TIME);
- /* XXX should be configurable */
- st->log_events=LOG_SEC|LOG_ERROR|
- LOG_ACTIVATE_KEY|LOG_TIMEOUT_KEY|LOG_SETUP_INIT|LOG_SETUP_TIMEOUT;
+#define DEFAULT(D) (st->peer_mobile || local_mobile \
+ ? DEFAULT_MOBILE_##D : DEFAULT_##D)
+#define CFG_NUMBER(k,D) dict_read_number(dict,(k),False,"site",loc,DEFAULT(D));
+
+ st->key_lifetime= CFG_NUMBER("key-lifetime", KEY_LIFETIME);
+ st->setup_retries= CFG_NUMBER("setup-retries", SETUP_RETRIES);
+ st->setup_retry_interval= CFG_NUMBER("setup-timeout", SETUP_RETRY_INTERVAL);
+ st->wait_timeout= CFG_NUMBER("wait-time", WAIT_TIME);
+
+ st->mobile_peer_expiry= dict_read_number(
+ dict,"mobile-peer-expiry",False,"site",loc,DEFAULT_MOBILE_PEER_EXPIRY);
+
+ st->transport_peers_max= !st->peer_mobile ? 1 : dict_read_number(
+ dict,"mobile-peers-max",False,"site",loc,DEFAULT_MOBILE_PEERS_MAX);
+ if (st->transport_peers_max<1 ||
+ st->transport_peers_max>=MAX_MOBILE_PEERS_MAX) {
+ cfgfatal(loc,"site","mobile-peers-max must be in range 1.."
+ STRING(MAX_MOBILE_PEERS_MAX) "\n");
+ }
+
+ if (st->key_lifetime < DEFAULT(KEY_RENEGOTIATE_GAP)*2)
+ st->key_renegotiate_time=st->key_lifetime/2;
+ else
+ st->key_renegotiate_time=st->key_lifetime-DEFAULT(KEY_RENEGOTIATE_GAP);
+ st->key_renegotiate_time=dict_read_number(
+ dict,"renegotiate-time",False,"site",loc,st->key_renegotiate_time);
+ if (st->key_renegotiate_time > st->key_lifetime) {
+ cfgfatal(loc,"site",
+ "renegotiate-time must be less than key-lifetime\n");
+ }
+
+ st->log_events=string_list_to_word(dict_lookup(dict,"log-events"),
+ log_event_table,"site");
+
+ st->allow_send_prod=0;
st->tunname=safe_malloc(strlen(st->localname)+strlen(st->remotename)+5,
"site_apply");
sprintf(st->tunname,"%s<->%s",st->localname,st->remotename);
/* The information we expect to see in incoming messages of type 1 */
- /* XXX fix this bit for unaligned access */
- st->setupsiglen=strlen(st->remotename)+strlen(st->localname)+8;
- st->setupsig=safe_malloc(st->setupsiglen,"site_apply");
- *(uint32_t *)&(st->setupsig[0])=LABEL_MSG1;
- *(uint16_t *)&(st->setupsig[4])=htons(strlen(st->remotename));
- memcpy(&st->setupsig[6],st->remotename,strlen(st->remotename));
- *(uint16_t *)&(st->setupsig[6+strlen(st->remotename)])=
- htons(strlen(st->localname));
- memcpy(&st->setupsig[8+strlen(st->remotename)],st->localname,
- strlen(st->localname));
+ /* fixme: lots of unchecked overflows here, but the results are only
+ corrupted packets rather than undefined behaviour */
st->setup_priority=(strcmp(st->localname,st->remotename)>0);
buffer_new(&st->buffer,SETUP_BUFFER_LEN);
+ buffer_new(&st->scratch,SETUP_BUFFER_LEN);
+ BUF_ALLOC(&st->scratch,"site:scratch");
+
/* We are interested in poll(), but only for timeouts. We don't have
any fds of our own. */
register_for_poll(st, site_beforepoll, site_afterpoll, 0, "site");
st->timeout=0;
- st->current_valid=False;
- st->current_key_timeout=0;
- st->peer_valid=False;
+ st->remote_capabilities=0;
+ st->chosen_transform=0;
+ st->current.key_timeout=0;
+ st->auxiliary_key.key_timeout=0;
+ transport_peers_clear(st,&st->peers);
+ transport_peers_clear(st,&st->setup_peers);
/* XXX mlock these */
st->dhsecret=safe_malloc(st->dh->len,"site:dhsecret");
- st->sharedsecret=safe_malloc(st->transform->keylen,"site:sharedsecret");
+ st->sharedsecretlen=st->sharedsecretallocd=0;
+ st->sharedsecret=0;
+
+ for (i=0; i<st->ntransforms; i++) {
+ struct transform_if *ti=st->transforms[i];
+ uint32_t capbit = 1UL << ti->capab_transformnum;
+ if (st->local_capabilities & capbit)
+ slog(st,LOG_ERROR,"transformnum capability bit"
+ " %d (%#"PRIx32") reused", ti->capab_transformnum, capbit);
+ st->local_capabilities |= capbit;
+ }
/* We need to register the remote networks with the netlink device */
- st->netlink_cid=st->netlink->regnets(st->netlink->st, &st->remotenets,
- site_outgoing, st,
- st->transform->max_start_pad+(4*4),
- st->transform->max_end_pad,
- st->tunname);
-
- st->comm->request_notify(st->comm->st, st, site_incoming);
+ st->netlink->reg(st->netlink->st, site_outgoing, st);
+
+ for (i=0; i<st->ncomms; i++)
+ st->comms[i]->request_notify(st->comms[i]->st, st, site_incoming);
- st->current_transform=st->transform->create(st->transform->st);
- st->new_transform=st->transform->create(st->transform->st);
+ st->current.transform=0;
+ st->auxiliary_key.transform=0;
+ st->new_transform=0;
+ st->auxiliary_is_new=0;
enter_state_stop(st);
+ add_hook(PHASE_SHUTDOWN,site_phase_hook,st);
+
return new_closure(&st->cl);
}
-init_module site_module;
void site_module(dict_t *dict)
{
add_closure(dict,"site",site_apply);
}
+
+
+/***** TRANSPORT PEERS definitions *****/
+
+static void transport_peers_debug(struct site *st, transport_peers *dst,
+ const char *didwhat,
+ int nargs, const struct comm_addr *args,
+ size_t stride) {
+ int i;
+ char *argp;
+
+ if (!(st->log_events & LOG_PEER_ADDRS))
+ return; /* an optimisation */
+
+ slog(st, LOG_PEER_ADDRS, "peers (%s) %s nargs=%d => npeers=%d",
+ (dst==&st->peers ? "data" :
+ dst==&st->setup_peers ? "setup" : "UNKNOWN"),
+ didwhat, nargs, dst->npeers);
+
+ for (i=0, argp=(void*)args;
+ i<nargs;
+ i++, (argp+=stride?stride:sizeof(*args))) {
+ const struct comm_addr *ca=(void*)argp;
+ slog(st, LOG_PEER_ADDRS, " args: addrs[%d]=%s",
+ i, ca->comm->addr_to_string(ca->comm->st,ca));
+ }
+ for (i=0; i<dst->npeers; i++) {
+ struct timeval diff;
+ timersub(tv_now,&dst->peers[i].last,&diff);
+ const struct comm_addr *ca=&dst->peers[i].addr;
+ slog(st, LOG_PEER_ADDRS, " peers: addrs[%d]=%s T-%ld.%06ld",
+ i, ca->comm->addr_to_string(ca->comm->st,ca),
+ (unsigned long)diff.tv_sec, (unsigned long)diff.tv_usec);
+ }
+}
+
+static int transport_peer_compar(const void *av, const void *bv) {
+ const transport_peer *a=av;
+ const transport_peer *b=bv;
+ /* put most recent first in the array */
+ if (timercmp(&a->last, &b->last, <)) return +1;
+ if (timercmp(&a->last, &b->last, >)) return -11;
+ return 0;
+}
+
+static void transport_peers_expire(struct site *st, transport_peers *peers) {
+ /* peers must be sorted first */
+ int previous_peers=peers->npeers;
+ struct timeval oldest;
+ oldest.tv_sec = tv_now->tv_sec - st->mobile_peer_expiry;
+ oldest.tv_usec = tv_now->tv_usec;
+ while (peers->npeers>1 &&
+ timercmp(&peers->peers[peers->npeers-1].last, &oldest, <))
+ peers->npeers--;
+ if (peers->npeers != previous_peers)
+ transport_peers_debug(st,peers,"expire", 0,0,0);
+}
+
+static void transport_record_peer(struct site *st, transport_peers *peers,
+ const struct comm_addr *addr, const char *m) {
+ int slot, changed=0;
+
+ for (slot=0; slot<peers->npeers; slot++)
+ if (!memcmp(&peers->peers[slot].addr, addr, sizeof(*addr)))
+ goto found;
+
+ changed=1;
+ if (peers->npeers==st->transport_peers_max)
+ slot=st->transport_peers_max;
+ else
+ slot=peers->npeers++;
+
+ found:
+ peers->peers[slot].addr=*addr;
+ peers->peers[slot].last=*tv_now;
+
+ if (peers->npeers>1)
+ qsort(peers->peers, peers->npeers,
+ sizeof(*peers->peers), transport_peer_compar);
+
+ if (changed || peers->npeers!=1)
+ transport_peers_debug(st,peers,m, 1,addr,0);
+ transport_peers_expire(st, peers);
+}
+
+static bool_t transport_compute_setupinit_peers(struct site *st,
+ const struct comm_addr *configured_addr /* 0 if none or not found */,
+ const struct comm_addr *prod_hint_addr /* 0 if none */) {
+
+ if (!configured_addr && !prod_hint_addr &&
+ !transport_peers_valid(&st->peers))
+ return False;
+
+ slog(st,LOG_SETUP_INIT,
+ "using:%s%s %d old peer address(es)",
+ configured_addr ? " configured address;" : "",
+ prod_hint_addr ? " PROD hint address;" : "",
+ st->peers.npeers);
+
+ /* Non-mobile peers havve st->peers.npeers==0 or ==1, since they
+ * have transport_peers_max==1. The effect is that this code
+ * always uses the configured address if supplied, or otherwise
+ * the address of the incoming PROD, or the existing data peer if
+ * one exists; this is as desired. */
+
+ transport_peers_copy(st,&st->setup_peers,&st->peers);
+
+ if (prod_hint_addr)
+ transport_record_peer(st,&st->setup_peers,prod_hint_addr,"prod");
+
+ if (configured_addr)
+ transport_record_peer(st,&st->setup_peers,configured_addr,"setupinit");
+
+ assert(transport_peers_valid(&st->setup_peers));
+ return True;
+}
+
+static void transport_setup_msgok(struct site *st, const struct comm_addr *a) {
+ if (st->peer_mobile)
+ transport_record_peer(st,&st->setup_peers,a,"setupmsg");
+}
+static void transport_data_msgok(struct site *st, const struct comm_addr *a) {
+ if (st->peer_mobile)
+ transport_record_peer(st,&st->peers,a,"datamsg");
+}
+
+static int transport_peers_valid(transport_peers *peers) {
+ return peers->npeers;
+}
+static void transport_peers_clear(struct site *st, transport_peers *peers) {
+ peers->npeers= 0;
+ transport_peers_debug(st,peers,"clear",0,0,0);
+}
+static void transport_peers_copy(struct site *st, transport_peers *dst,
+ const transport_peers *src) {
+ dst->npeers=src->npeers;
+ memcpy(dst->peers, src->peers, sizeof(*dst->peers) * dst->npeers);
+ transport_peers_debug(st,dst,"copy",
+ src->npeers, &src->peers->addr, sizeof(*src->peers));
+}
+
+void transport_xmit(struct site *st, transport_peers *peers,
+ struct buffer_if *buf, bool_t candebug) {
+ int slot;
+ transport_peers_expire(st, peers);
+ for (slot=0; slot<peers->npeers; slot++) {
+ transport_peer *peer=&peers->peers[slot];
+ if (candebug)
+ dump_packet(st, buf, &peer->addr, False);
+ peer->addr.comm->sendmsg(peer->addr.comm->st, buf, &peer->addr);
+ }
+}
+
+/***** END of transport peers declarations *****/
~ianmdlvl / secnet.git / blobdiff