2 This file is part of GNUnet.
3 Copyright (C) 2013 Christian Grothoff (and other contributing authors)
5 GNUnet is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published
7 by the Free Software Foundation; either version 3, or (at your
8 option) any later version.
10 GNUnet is distributed in the hope that it will be useful, but
11 WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 General Public License for more details.
15 You should have received a copy of the GNU General Public License
16 along with GNUnet; see the file COPYING. If not, write to the
17 Free Software Foundation, Inc., 59 Temple Place - Suite 330,
18 Boston, MA 02111-1307, USA.
22 #include "gnunet_util_lib.h"
24 #include "gnunet_signatures.h"
25 #include "gnunet_statistics_service.h"
27 #include "cadet_protocol.h"
28 #include "cadet_path.h"
30 #include "gnunet-service-cadet_tunnel.h"
31 #include "gnunet-service-cadet_connection.h"
32 #include "gnunet-service-cadet_channel.h"
33 #include "gnunet-service-cadet_peer.h"
35 #define LOG(level, ...) GNUNET_log_from(level,"cadet-tun",__VA_ARGS__)
36 #define LOG2(level, ...) GNUNET_log_from_nocheck(level,"cadet-tun",__VA_ARGS__)
38 #define REKEY_WAIT GNUNET_TIME_relative_multiply(GNUNET_TIME_UNIT_SECONDS, 5)
40 #if !defined(GNUNET_CULL_LOGGING)
41 #define DUMP_KEYS_TO_STDERR GNUNET_YES
43 #define DUMP_KEYS_TO_STDERR GNUNET_NO
46 #define MAX_SKIPPED_KEYS 64
47 #define MAX_KEY_GAP 256
48 #define AX_HEADER_SIZE (sizeof (uint32_t) * 2\
49 + sizeof (struct GNUNET_CRYPTO_EcdhePublicKey))
52 /******************************************************************************/
53 /******************************** STRUCTS **********************************/
54 /******************************************************************************/
58 struct CadetTChannel *next;
59 struct CadetTChannel *prev;
60 struct CadetChannel *ch;
65 * Connection list and metadata.
67 struct CadetTConnection
72 struct CadetTConnection *next;
77 struct CadetTConnection *prev;
82 struct CadetConnection *c;
85 * Creation time, to keep oldest connection alive.
87 struct GNUNET_TIME_Absolute created;
90 * Connection throughput, to keep fastest connection alive.
96 * Structure used during a Key eXchange.
98 struct CadetTunnelKXCtx
101 * Encryption ("our") old "confirmed" key, for encrypting traffic sent by us
102 * end before the key exchange is finished or times out.
104 struct GNUNET_CRYPTO_SymmetricSessionKey e_key_old;
107 * Decryption ("their") old "confirmed" key, for decrypting traffic sent by
108 * the other end before the key exchange started.
110 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old;
113 * Same as @c e_key_old, for the case of two simultaneous KX.
114 * This can happen if cadet decides to start a re-key while the peer has also
115 * started its re-key (due to network delay this is impossible to avoid).
116 * In this case, the key material generated with the peer's old ephemeral
117 * *might* (but doesn't have to) be incorrect.
118 * Since no more than two re-keys can happen simultaneously, this is enough.
120 struct GNUNET_CRYPTO_SymmetricSessionKey e_key_old2;
123 * Same as @c d_key_old, for the case described in @c e_key_old2.
125 struct GNUNET_CRYPTO_SymmetricSessionKey d_key_old2;
128 * Challenge to send and expect in the PONG.
133 * When the rekey started. One minute after this the new key will be used.
135 struct GNUNET_TIME_Absolute rekey_start_time;
138 * Task for delayed destruction of the Key eXchange context, to allow delayed
139 * messages with the old key to be decrypted successfully.
141 struct GNUNET_SCHEDULER_Task *finish_task;
145 * Encryption systems possible.
147 enum CadetTunnelEncryption
150 * Default Axolotl system.
155 * Fallback OTR-style encryption.
161 * Struct to old keys for skipped messages while advancing the Axolotl ratchet.
163 struct CadetTunnelSkippedKey
168 struct CadetTunnelSkippedKey *next;
173 struct CadetTunnelSkippedKey *prev;
176 * When was this key stored (for timeout).
178 struct GNUNET_TIME_Absolute timestamp;
183 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
188 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
192 * Axolotl data, according to @url https://github.com/trevp/axolotl/wiki .
194 struct CadetTunnelAxolotl
197 * A (double linked) list of stored message keys and associated header keys
198 * for "skipped" messages, i.e. messages that have not been
199 * received despite the reception of more recent messages, (head).
201 struct CadetTunnelSkippedKey *skipped_head;
204 * Skipped messages' keys DLL, tail.
206 struct CadetTunnelSkippedKey *skipped_tail;
209 * Elements in @a skipped_head <-> @a skipped_tail.
211 unsigned int skipped;
214 * 32-byte root key which gets updated by DH ratchet.
216 struct GNUNET_CRYPTO_SymmetricSessionKey RK;
219 * 32-byte header key (send).
221 struct GNUNET_CRYPTO_SymmetricSessionKey HKs;
224 * 32-byte header key (recv)
226 struct GNUNET_CRYPTO_SymmetricSessionKey HKr;
229 * 32-byte next header key (send).
231 struct GNUNET_CRYPTO_SymmetricSessionKey NHKs;
234 * 32-byte next header key (recv).
236 struct GNUNET_CRYPTO_SymmetricSessionKey NHKr;
239 * 32-byte chain keys (used for forward-secrecy updating, send).
241 struct GNUNET_CRYPTO_SymmetricSessionKey CKs;
244 * 32-byte chain keys (used for forward-secrecy updating, recv).
246 struct GNUNET_CRYPTO_SymmetricSessionKey CKr;
249 * ECDH for key exchange (A0 / B0).
251 struct GNUNET_CRYPTO_EcdhePrivateKey *kx_0;
254 * ECDH Identity key (recv).
256 struct GNUNET_CRYPTO_EcdhePublicKey DHIr;
259 * ECDH Ratchet key (send).
261 struct GNUNET_CRYPTO_EcdhePrivateKey *DHRs;
264 * ECDH Ratchet key (recv).
266 struct GNUNET_CRYPTO_EcdhePublicKey DHRr;
269 * Message number (reset to 0 with each new ratchet, next message to send).
274 * Message number (reset to 0 with each new ratchet, next message to recv).
279 * Previous message numbers (# of msgs sent under prev ratchet)
284 * True (#GNUNET_YES) if the party will send a new ratchet key in next msg.
290 * Struct containing all information regarding a tunnel to a peer.
295 * Endpoint of the tunnel.
297 struct CadetPeer *peer;
300 * Type of encryption used in the tunnel.
302 enum CadetTunnelEncryption enc_type;
307 struct CadetTunnelAxolotl *ax;
310 * State of the tunnel connectivity.
312 enum CadetTunnelCState cstate;
315 * State of the tunnel encryption.
317 enum CadetTunnelEState estate;
320 * Key eXchange context.
322 struct CadetTunnelKXCtx *kx_ctx;
325 * Peer's ephemeral key, to recreate @c e_key and @c d_key when own ephemeral
328 struct GNUNET_CRYPTO_EcdhePublicKey peers_ephemeral_key;
331 * Encryption ("our") key. It is only "confirmed" if kx_ctx is NULL.
333 struct GNUNET_CRYPTO_SymmetricSessionKey e_key;
336 * Decryption ("their") key. It is only "confirmed" if kx_ctx is NULL.
338 struct GNUNET_CRYPTO_SymmetricSessionKey d_key;
341 * Task to start the rekey process.
343 struct GNUNET_SCHEDULER_Task * rekey_task;
346 * Paths that are actively used to reach the destination peer.
348 struct CadetTConnection *connection_head;
349 struct CadetTConnection *connection_tail;
352 * Next connection number.
357 * Channels inside this tunnel.
359 struct CadetTChannel *channel_head;
360 struct CadetTChannel *channel_tail;
363 * Channel ID for the next created channel.
365 CADET_ChannelNumber next_chid;
368 * Destroy flag: if true, destroy on last message.
370 struct GNUNET_SCHEDULER_Task * destroy_task;
373 * Queued messages, to transmit once tunnel gets connected.
375 struct CadetTunnelDelayed *tq_head;
376 struct CadetTunnelDelayed *tq_tail;
379 * Task to trim connections if too many are present.
381 struct GNUNET_SCHEDULER_Task * trim_connections_task;
384 * Ephemeral message in the queue (to avoid queueing more than one).
386 struct CadetConnectionQueue *ephm_h;
389 * Pong message in the queue.
391 struct CadetConnectionQueue *pong_h;
396 * Struct used to save messages in a non-ready tunnel to send once connected.
398 struct CadetTunnelDelayed
403 struct CadetTunnelDelayed *next;
404 struct CadetTunnelDelayed *prev;
409 struct CadetTunnel *t;
412 * Tunnel queue given to the channel to cancel request. Update on send_queued.
414 struct CadetTunnelQueue *tq;
419 /* struct GNUNET_MessageHeader *msg; */
424 * Handle for messages queued but not yet sent.
426 struct CadetTunnelQueue
429 * Connection queue handle, to cancel if necessary.
431 struct CadetConnectionQueue *cq;
434 * Handle in case message hasn't been given to a connection yet.
436 struct CadetTunnelDelayed *tqd;
439 * Continuation to call once sent.
444 * Closure for @c cont.
451 * Cached Axolotl key with signature.
453 struct CadetAxolotlSignedKey
456 * Information about what is being signed (@a permanent_key).
458 struct GNUNET_CRYPTO_EccSignaturePurpose purpose;
461 * Permanent public ECDH key.
463 struct GNUNET_CRYPTO_EcdhePublicKey permanent_key;
466 * An EdDSA signature of the permanent ECDH key with the Peer's ID key.
468 struct GNUNET_CRYPTO_EddsaSignature signature;
472 /******************************************************************************/
473 /******************************* GLOBALS ***********************************/
474 /******************************************************************************/
477 * Global handle to the statistics service.
479 extern struct GNUNET_STATISTICS_Handle *stats;
482 * Local peer own ID (memory efficient handle).
484 extern GNUNET_PEER_Id myid;
487 * Local peer own ID (full value).
489 extern struct GNUNET_PeerIdentity my_full_id;
493 * Don't try to recover tunnels if shutting down.
495 extern int shutting_down;
499 * Set of all tunnels, in order to trigger a new exchange on rekey.
500 * Indexed by peer's ID.
502 static struct GNUNET_CONTAINER_MultiPeerMap *tunnels;
505 * Default TTL for payload packets.
507 static unsigned long long default_ttl;
511 * Own Peer ID private key.
513 const static struct GNUNET_CRYPTO_EddsaPrivateKey *id_key;
515 /******************************** AXOLOTL ************************************/
517 static struct GNUNET_CRYPTO_EcdhePrivateKey *ax_key;
520 * Own Axolotl permanent public key (cache).
522 static struct CadetAxolotlSignedKey ax_identity;
524 /******************************** OTR ***********************************/
528 * Own global OTR ephemeral private key.
530 static struct GNUNET_CRYPTO_EcdhePrivateKey *otr_ephemeral_key;
533 * Cached message used to perform a OTR key exchange.
535 static struct GNUNET_CADET_KX_Ephemeral otr_kx_msg;
538 * Task to generate a new OTR ephemeral key.
540 static struct GNUNET_SCHEDULER_Task *rekey_task;
545 static struct GNUNET_TIME_Relative rekey_period;
548 /******************************************************************************/
549 /******************************** STATIC ***********************************/
550 /******************************************************************************/
553 * Get string description for tunnel connectivity state.
555 * @param cs Tunnel state.
557 * @return String representation.
560 cstate2s (enum CadetTunnelCState cs)
566 case CADET_TUNNEL_NEW:
567 return "CADET_TUNNEL_NEW";
568 case CADET_TUNNEL_SEARCHING:
569 return "CADET_TUNNEL_SEARCHING";
570 case CADET_TUNNEL_WAITING:
571 return "CADET_TUNNEL_WAITING";
572 case CADET_TUNNEL_READY:
573 return "CADET_TUNNEL_READY";
574 case CADET_TUNNEL_SHUTDOWN:
575 return "CADET_TUNNEL_SHUTDOWN";
577 SPRINTF (buf, "%u (UNKNOWN STATE)", cs);
585 * Get string description for tunnel encryption state.
587 * @param es Tunnel state.
589 * @return String representation.
592 estate2s (enum CadetTunnelEState es)
598 case CADET_TUNNEL_KEY_UNINITIALIZED:
599 return "CADET_TUNNEL_KEY_UNINITIALIZED";
600 case CADET_TUNNEL_KEY_SENT:
601 return "CADET_TUNNEL_KEY_SENT";
602 case CADET_TUNNEL_KEY_PING:
603 return "CADET_TUNNEL_KEY_PING";
604 case CADET_TUNNEL_KEY_OK:
605 return "CADET_TUNNEL_KEY_OK";
606 case CADET_TUNNEL_KEY_REKEY:
607 return "CADET_TUNNEL_KEY_REKEY";
609 SPRINTF (buf, "%u (UNKNOWN STATE)", es);
617 * @brief Check if tunnel is ready to send traffic.
619 * Tunnel must be connected and with encryption correctly set up.
621 * @param t Tunnel to check.
623 * @return #GNUNET_YES if ready, #GNUNET_NO otherwise
626 is_ready (struct CadetTunnel *t)
630 GCT_debug (t, GNUNET_ERROR_TYPE_DEBUG);
631 ready = CADET_TUNNEL_READY == t->cstate
632 && (CADET_TUNNEL_KEY_OK == t->estate
633 || CADET_TUNNEL_KEY_REKEY == t->estate);
634 ready = ready || GCT_is_loopback (t);
640 * Check if a key is invalid (NULL pointer or all 0)
642 * @param key Key to check.
644 * @return #GNUNET_YES if key is null, #GNUNET_NO if exists and is not 0.
647 is_key_null (struct GNUNET_CRYPTO_SymmetricSessionKey *key)
649 struct GNUNET_CRYPTO_SymmetricSessionKey null_key;
654 memset (&null_key, 0, sizeof (null_key));
655 if (0 == memcmp (key, &null_key, sizeof (null_key)))
662 * Ephemeral key message purpose size.
664 * @return Size of the part of the ephemeral key message that must be signed.
667 ephemeral_purpose_size (void)
669 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
670 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
671 sizeof (struct GNUNET_TIME_AbsoluteNBO) +
672 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey) +
673 sizeof (struct GNUNET_PeerIdentity);
678 * Ephemeral key message purpose size.
680 * @return Size of the part of the ephemeral key message that must be signed.
683 ax_purpose_size (void)
685 return sizeof (struct GNUNET_CRYPTO_EccSignaturePurpose) +
686 sizeof (struct GNUNET_CRYPTO_EcdhePublicKey);
691 * Size of the encrypted part of a ping message.
693 * @return Size of the encrypted part of a ping message.
696 ping_encryption_size (void)
698 return sizeof (uint32_t);
703 * Get the channel's buffer. ONLY FOR NON-LOOPBACK CHANNELS!!
705 * @param tch Tunnel's channel handle.
707 * @return Amount of messages the channel can still buffer towards the client.
710 get_channel_buffer (const struct CadetTChannel *tch)
714 /* If channel is incoming, is terminal in the FWD direction and fwd is YES */
715 fwd = GCCH_is_terminal (tch->ch, GNUNET_YES);
717 return GCCH_get_buffer (tch->ch, fwd);
722 * Get the channel's allowance status.
724 * @param tch Tunnel's channel handle.
726 * @return #GNUNET_YES if we allowed the client to send data to us.
729 get_channel_allowed (const struct CadetTChannel *tch)
733 /* If channel is outgoing, is origin in the FWD direction and fwd is YES */
734 fwd = GCCH_is_origin (tch->ch, GNUNET_YES);
736 return GCCH_get_allowed (tch->ch, fwd);
741 * Get the connection's buffer.
743 * @param tc Tunnel's connection handle.
745 * @return Amount of messages the connection can still buffer.
748 get_connection_buffer (const struct CadetTConnection *tc)
752 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
753 fwd = GCC_is_origin (tc->c, GNUNET_YES);
755 return GCC_get_buffer (tc->c, fwd);
760 * Get the connection's allowance.
762 * @param tc Tunnel's connection handle.
764 * @return Amount of messages we have allowed the next peer to send us.
767 get_connection_allowed (const struct CadetTConnection *tc)
771 /* If connection is outgoing, is origin in the FWD direction and fwd is YES */
772 fwd = GCC_is_origin (tc->c, GNUNET_YES);
774 return GCC_get_allowed (tc->c, fwd);
779 * Check that a ephemeral key message s well formed and correctly signed.
781 * @param t Tunnel on which the message came.
782 * @param msg The ephemeral key message.
784 * @return GNUNET_OK if message is fine, GNUNET_SYSERR otherwise.
787 check_ephemeral (struct CadetTunnel *t,
788 const struct GNUNET_CADET_KX_Ephemeral *msg)
790 /* Check message size */
791 if (ntohs (msg->header.size) != sizeof (struct GNUNET_CADET_KX_Ephemeral))
792 return GNUNET_SYSERR;
794 /* Check signature size */
795 if (ntohl (msg->purpose.size) != ephemeral_purpose_size ())
796 return GNUNET_SYSERR;
799 if (0 != memcmp (&msg->origin_identity,
800 GCP_get_id (t->peer),
801 sizeof (struct GNUNET_PeerIdentity)))
802 return GNUNET_SYSERR;
804 /* Check signature */
806 GNUNET_CRYPTO_eddsa_verify (GNUNET_SIGNATURE_PURPOSE_CADET_KX,
809 &msg->origin_identity.public_key))
810 return GNUNET_SYSERR;
817 * Select the best key to use for encryption (send), based on KX status.
819 * Normally, return the current key. If there is a KX in progress and the old
820 * key is fresh enough, return the old key.
822 * @param t Tunnel to choose the key from.
824 * @return The optimal key to encrypt/hmac outgoing traffic.
826 static const struct GNUNET_CRYPTO_SymmetricSessionKey *
827 select_key (const struct CadetTunnel *t)
829 const struct GNUNET_CRYPTO_SymmetricSessionKey *key;
831 if (NULL != t->kx_ctx
832 && NULL == t->kx_ctx->finish_task)
834 struct GNUNET_TIME_Relative age;
836 age = GNUNET_TIME_absolute_get_duration (t->kx_ctx->rekey_start_time);
837 LOG (GNUNET_ERROR_TYPE_DEBUG,
838 " key exchange in progress, started %s ago\n",
839 GNUNET_STRINGS_relative_time_to_string (age, GNUNET_YES));
840 // FIXME make duration of old keys configurable
841 if (age.rel_value_us < GNUNET_TIME_UNIT_MINUTES.rel_value_us)
843 LOG (GNUNET_ERROR_TYPE_DEBUG, " using old key\n");
844 key = &t->kx_ctx->e_key_old;
848 LOG (GNUNET_ERROR_TYPE_DEBUG, " using new key (old key too old)\n");
854 LOG (GNUNET_ERROR_TYPE_DEBUG, " no KX: using current key\n");
864 * @param plaintext Content to HMAC.
865 * @param size Size of @c plaintext.
866 * @param iv Initialization vector for the message.
867 * @param key Key to use.
868 * @param hmac[out] Destination to store the HMAC.
871 t_hmac (const void *plaintext, size_t size,
872 uint32_t iv, const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
873 struct GNUNET_CADET_Hash *hmac)
875 static const char ctx[] = "cadet authentication key";
876 struct GNUNET_CRYPTO_AuthKey auth_key;
877 struct GNUNET_HashCode hash;
879 #if DUMP_KEYS_TO_STDERR
880 LOG (GNUNET_ERROR_TYPE_INFO, " HMAC %u bytes with key %s\n", size,
881 GNUNET_h2s ((struct GNUNET_HashCode *) key));
883 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
888 /* Two step: CADET_Hash is only 256 bits, HashCode is 512. */
889 GNUNET_CRYPTO_hmac (&auth_key, plaintext, size, &hash);
890 memcpy (hmac, &hash, sizeof (*hmac));
895 * Encrypt daforce_newest_keyta with the tunnel key.
897 * @param t Tunnel whose key to use.
898 * @param dst Destination for the encrypted data.
899 * @param src Source of the plaintext. Can overlap with @c dst.
900 * @param size Size of the plaintext.
901 * @param iv Initialization Vector to use.
902 * @param force_newest_key Force the use of the newest key, otherwise
903 * CADET will use the old key when allowed.
904 * This can happen in the case when a KX is going on
905 * and the old one hasn't expired.
908 t_encrypt (struct CadetTunnel *t, void *dst, const void *src,
909 size_t size, uint32_t iv, int force_newest_key)
911 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
912 const struct GNUNET_CRYPTO_SymmetricSessionKey *key;
915 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt start\n");
917 key = GNUNET_YES == force_newest_key ? &t->e_key : select_key (t);
918 #if DUMP_KEYS_TO_STDERR
919 LOG (GNUNET_ERROR_TYPE_INFO, " ENC with key %s\n",
920 GNUNET_h2s ((struct GNUNET_HashCode *) key));
922 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
923 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt IV derived\n");
924 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, key, &siv, dst);
925 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_encrypt end\n");
934 * @param key Key to use.
935 * @param hash[out] Resulting HMAC.
936 * @param source Source key material (data to HMAC).
937 * @param len Length of @a source.
940 t_ax_hmac_hash (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
941 struct GNUNET_HashCode *hash,
942 void *source, unsigned int len)
944 static const char ctx[] = "axolotl HMAC-HASH";
945 struct GNUNET_CRYPTO_AuthKey auth_key;
947 GNUNET_CRYPTO_hmac_derive_key (&auth_key, key,
950 GNUNET_CRYPTO_hmac (&auth_key, source, len, hash);
955 * Derive a key from a HMAC-HASH.
957 * @param key Key to use for the HMAC.
958 * @param out Key to generate.
959 * @param source Source key material (data to HMAC).
960 * @param len Length of @a source.
963 t_hmac_derive_key (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
964 struct GNUNET_CRYPTO_SymmetricSessionKey *out,
965 void *source, unsigned int len)
967 static const char ctx[] = "axolotl derive key";
968 struct GNUNET_HashCode h;
970 t_ax_hmac_hash (key, &h, source, len);
971 GNUNET_CRYPTO_kdf (out, sizeof (*out), ctx, sizeof (ctx),
972 &h, sizeof (h), NULL);
977 * Encrypt data with the axolotl tunnel key.
979 * @param t Tunnel whose key to use.
980 * @param dst Destination for the encrypted data.
981 * @param src Source of the plaintext. Can overlap with @c dst.
982 * @param size Size of the plaintext.
984 * @return Size of the encrypted data.
987 t_ax_encrypt (struct CadetTunnel *t, void *dst, const void *src, size_t size)
989 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
990 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
991 struct CadetTunnelAxolotl *ax;
994 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt start\n");
998 if (GNUNET_YES == ax->ratchet_flag)
1000 /* Advance ratchet */
1001 struct GNUNET_CRYPTO_SymmetricSessionKey keys[3];
1002 struct GNUNET_HashCode dh;
1003 struct GNUNET_HashCode hmac;
1004 static const char ctx[] = "axolotl ratchet";
1006 ax->DHRs = GNUNET_CRYPTO_ecdhe_key_create ();
1009 /* RK, NHKs, CKs = KDF( HMAC-HASH(RK, DH(DHRs, DHRr)) ) */
1010 GNUNET_CRYPTO_ecc_ecdh (ax->DHRs, &ax->DHRr, &dh);
1011 t_ax_hmac_hash (&ax->RK, &hmac, &dh, sizeof (dh));
1012 GNUNET_CRYPTO_kdf (keys, sizeof (keys), ctx, sizeof (ctx),
1013 &hmac, sizeof (hmac), NULL);
1020 ax->ratchet_flag = GNUNET_NO;
1023 t_hmac_derive_key (&ax->CKs, &MK, "0", 1);
1024 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &MK, NULL, 0, NULL);
1026 #if DUMP_KEYS_TO_STDERR
1027 LOG (GNUNET_ERROR_TYPE_INFO, " CKs: %s\n",
1028 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->CKs));
1029 LOG (GNUNET_ERROR_TYPE_INFO, " AX_ENC with key %s\n",
1030 GNUNET_h2s ((struct GNUNET_HashCode *) &MK));
1033 out_size = GNUNET_CRYPTO_symmetric_encrypt (src, size, &MK, &iv, dst);
1035 t_hmac_derive_key (&ax->CKs, &ax->CKs, "1", 1);
1037 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt end\n");
1044 * Decrypt data with the axolotl tunnel key.
1046 * @param t Tunnel whose key to use.
1047 * @param dst Destination for the decrypted data.
1048 * @param src Source of the ciphertext. Can overlap with @c dst.
1049 * @param size Size of the ciphertext.
1051 * @return Size of the decrypted data.
1054 t_ax_decrypt (struct CadetTunnel *t, void *dst, const void *src, size_t size)
1056 struct GNUNET_CRYPTO_SymmetricSessionKey MK;
1057 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
1058 struct CadetTunnelAxolotl *ax;
1061 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_decrypt start\n");
1065 t_hmac_derive_key (&ax->CKr, &MK, "0", 1);
1066 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &MK, NULL, 0, NULL);
1068 #if DUMP_KEYS_TO_STDERR
1069 LOG (GNUNET_ERROR_TYPE_INFO, " CKr: %s\n",
1070 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->CKr));
1071 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC with key %s\n",
1072 GNUNET_h2s ((struct GNUNET_HashCode *) &MK));
1075 GNUNET_assert (size >= sizeof (struct GNUNET_MessageHeader));
1076 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, &MK, &iv, dst);
1077 GNUNET_assert (out_size == size);
1079 t_hmac_derive_key (&ax->CKr, &ax->CKr, "1", 1);
1081 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_decrypt end\n");
1088 * Encrypt header with the axolotl header key.
1090 * @param t Tunnel whose key to use.
1091 * @param msg Message whose header to encrypt.
1094 t_h_encrypt (struct CadetTunnel *t, struct GNUNET_CADET_AX *msg)
1096 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
1097 struct CadetTunnelAxolotl *ax;
1100 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_h_encrypt start\n");
1103 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &ax->HKs, NULL, 0, NULL);
1105 #if DUMP_KEYS_TO_STDERR
1106 LOG (GNUNET_ERROR_TYPE_INFO, " AX_ENC_H with key %s\n",
1107 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->HKs));
1110 out_size = GNUNET_CRYPTO_symmetric_encrypt (&msg->Ns, AX_HEADER_SIZE,
1111 &ax->HKs, &iv, &msg->Ns);
1113 GNUNET_assert (AX_HEADER_SIZE == out_size);
1115 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_encrypt end\n");
1120 * Decrypt header with the current axolotl header key.
1122 * @param t Tunnel whose current ax HK to use.
1123 * @param src Message whose header to decrypt.
1124 * @param dst Where to decrypt header to.
1127 t_h_decrypt (struct CadetTunnel *t, const struct GNUNET_CADET_AX *src,
1128 struct GNUNET_CADET_AX *dst)
1130 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
1131 struct CadetTunnelAxolotl *ax;
1134 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_h_decrypt start\n");
1137 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &ax->HKr, NULL, 0, NULL);
1139 #if DUMP_KEYS_TO_STDERR
1140 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC_H with key %s\n",
1141 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->HKr));
1144 out_size = GNUNET_CRYPTO_symmetric_decrypt (&src->Ns, AX_HEADER_SIZE,
1145 &ax->HKr, &iv, &dst->Ns);
1147 GNUNET_assert (AX_HEADER_SIZE == out_size);
1149 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_ax_decrypt end\n");
1154 * Decrypt and verify data with the appropriate tunnel key.
1156 * @param key Key to use.
1157 * @param dst Destination for the plaintext.
1158 * @param src Source of the encrypted data. Can overlap with @c dst.
1159 * @param size Size of the encrypted data.
1160 * @param iv Initialization Vector to use.
1162 * @return Size of the decrypted data, -1 if an error was encountered.
1165 decrypt (const struct GNUNET_CRYPTO_SymmetricSessionKey *key,
1166 void *dst, const void *src, size_t size, uint32_t iv)
1168 struct GNUNET_CRYPTO_SymmetricInitializationVector siv;
1171 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt start\n");
1172 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt iv\n");
1173 GNUNET_CRYPTO_symmetric_derive_iv (&siv, key, &iv, sizeof (iv), NULL);
1174 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt iv done\n");
1175 out_size = GNUNET_CRYPTO_symmetric_decrypt (src, size, key, &siv, dst);
1176 LOG (GNUNET_ERROR_TYPE_DEBUG, " decrypt end\n");
1183 * Decrypt and verify data with the most recent tunnel key.
1185 * @param t Tunnel whose key to use.
1186 * @param dst Destination for the plaintext.
1187 * @param src Source of the encrypted data. Can overlap with @c dst.
1188 * @param size Size of the encrypted data.
1189 * @param iv Initialization Vector to use.
1191 * @return Size of the decrypted data, -1 if an error was encountered.
1194 t_decrypt (struct CadetTunnel *t, void *dst, const void *src,
1195 size_t size, uint32_t iv)
1199 #if DUMP_KEYS_TO_STDERR
1200 LOG (GNUNET_ERROR_TYPE_DEBUG, " t_decrypt with %s\n",
1201 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
1203 if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
1205 GNUNET_STATISTICS_update (stats, "# non decryptable data", 1, GNUNET_NO);
1206 LOG (GNUNET_ERROR_TYPE_WARNING,
1207 "got data on %s without a valid key\n",
1209 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1213 out_size = decrypt (&t->d_key, dst, src, size, iv);
1220 * Decrypt and verify data with the appropriate tunnel key and verify that the
1221 * data has not been altered since it was sent by the remote peer.
1223 * @param t Tunnel whose key to use.
1224 * @param dst Destination for the plaintext.
1225 * @param src Source of the encrypted data. Can overlap with @c dst.
1226 * @param size Size of the encrypted data.
1227 * @param iv Initialization Vector to use.
1228 * @param msg_hmac HMAC of the message, cannot be NULL.
1230 * @return Size of the decrypted data, -1 if an error was encountered.
1233 t_decrypt_and_validate (struct CadetTunnel *t,
1234 void *dst, const void *src,
1235 size_t size, uint32_t iv,
1236 const struct GNUNET_CADET_Hash *msg_hmac)
1238 struct GNUNET_CRYPTO_SymmetricSessionKey *key;
1239 struct GNUNET_CADET_Hash hmac;
1242 /* Try primary (newest) key */
1244 decrypted_size = decrypt (key, dst, src, size, iv);
1245 t_hmac (src, size, iv, key, &hmac);
1246 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
1247 return decrypted_size;
1249 /* If no key exchange is going on, we just failed. */
1250 if (NULL == t->kx_ctx)
1252 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1253 "Failed checksum validation on tunnel %s with no KX\n",
1255 GNUNET_STATISTICS_update (stats, "# wrong HMAC no KX", 1, GNUNET_NO);
1259 /* Try secondary key, from previous KX period. */
1260 key = &t->kx_ctx->d_key_old;
1261 decrypted_size = decrypt (key, dst, src, size, iv);
1262 t_hmac (src, size, iv, key, &hmac);
1263 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
1264 return decrypted_size;
1266 /* Hail Mary, try tertiary, key, in case of parallel re-keys. */
1267 key = &t->kx_ctx->d_key_old2;
1268 decrypted_size = decrypt (key, dst, src, size, iv);
1269 t_hmac (src, size, iv, key, &hmac);
1270 if (0 == memcmp (msg_hmac, &hmac, sizeof (hmac)))
1271 return decrypted_size;
1273 GNUNET_log (GNUNET_ERROR_TYPE_ERROR,
1274 "Failed checksum validation on tunnel %s with KX\n",
1276 GNUNET_STATISTICS_update (stats, "# wrong HMAC with KX", 1, GNUNET_NO);
1282 * Decrypt and verify data with the appropriate tunnel key and verify that the
1283 * data has not been altered since it was sent by the remote peer.
1285 * @param t Tunnel whose key to use.
1286 * @param dst Destination for the plaintext.
1287 * @param src Source of the message. Can overlap with @c dst.
1288 * @param size Size of the message.
1290 * @return Size of the decrypted data, -1 if an error was encountered.
1293 try_old_ax_keys (struct CadetTunnel *t, struct GNUNET_CADET_AX *dst,
1294 const struct GNUNET_CADET_AX *src, size_t size)
1296 struct CadetTunnelSkippedKey *key;
1297 struct GNUNET_CADET_Hash hmac;
1298 struct GNUNET_CRYPTO_SymmetricInitializationVector iv;
1303 for (key = t->ax->skipped_head; NULL != key; key = key->next)
1305 t_hmac (&src->Ns, AX_HEADER_SIZE, 0, &key->HK, &hmac);
1306 if (0 != memcmp (&hmac, &src->hmac, sizeof (hmac)))
1312 #if DUMP_KEYS_TO_STDERR
1313 LOG (GNUNET_ERROR_TYPE_INFO, " AX_DEC with skipped key %s\n",
1314 GNUNET_h2s ((struct GNUNET_HashCode *) &key->MK));
1317 GNUNET_assert (size > sizeof (struct GNUNET_CADET_AX));
1318 len = size - sizeof (struct GNUNET_CADET_AX);
1319 GNUNET_CRYPTO_symmetric_derive_iv (&iv, &key->MK, NULL, 0, NULL);
1320 res = GNUNET_CRYPTO_symmetric_decrypt (&src[1], len, &key->MK, &iv, &dst[1]);
1322 GNUNET_CONTAINER_DLL_remove (t->ax->skipped_head, t->ax->skipped_tail, key);
1331 * Stage skipped AX keys and calculate the message key.
1333 * Stores each HK and MK for skipped messages.
1335 * @param t Tunnel where to stage the keys.
1336 * @param HKr Header key.
1337 * @param Nr Current message number.
1338 * @param Np Received meesage number.
1339 * @param CKr[in/out] Chain key, gets ratcheted forward to the new state.
1342 store_ax_keys (struct CadetTunnel *t,
1343 const struct GNUNET_CRYPTO_SymmetricSessionKey *HKr,
1344 uint32_t Nr, uint32_t Np,
1345 struct GNUNET_CRYPTO_SymmetricSessionKey *CKr)
1347 struct CadetTunnelSkippedKey *key;
1350 if (Np - Nr > MAX_KEY_GAP)
1352 /* Avoid DoS (forcing peer to do 2*33 chain HMAC operations) */
1353 /* TODO: start new key exchange on return */
1354 GNUNET_break_op (0);
1358 for (i = Nr; i < Np; i++)
1360 key = GNUNET_new (struct CadetTunnelSkippedKey);
1361 key->timestamp = GNUNET_TIME_absolute_get ();
1362 t_hmac_derive_key (CKr, &key->MK, "0", 1);
1363 #if DUMP_KEYS_TO_STDERR
1364 LOG (GNUNET_ERROR_TYPE_INFO, " storing MK for Nr %u: %s\n",
1365 i, GNUNET_h2s ((struct GNUNET_HashCode *) &key->MK));
1366 LOG (GNUNET_ERROR_TYPE_INFO, " for CKr: %s\n",
1367 GNUNET_h2s ((struct GNUNET_HashCode *) &t->ax->CKr));
1369 t_hmac_derive_key (CKr, CKr, "1", 1);
1370 GNUNET_CONTAINER_DLL_insert (t->ax->skipped_head, t->ax->skipped_tail, key);
1377 * Decrypt and verify data with the appropriate tunnel key and verify that the
1378 * data has not been altered since it was sent by the remote peer.
1380 * @param t Tunnel whose key to use.
1381 * @param dst Destination for the plaintext.
1382 * @param src Source of the message. Can overlap with @c dst.
1383 * @param size Size of the message.
1385 * @return Size of the decrypted data, -1 if an error was encountered.
1388 t_ax_decrypt_and_validate (struct CadetTunnel *t, void *dst,
1389 const struct GNUNET_CADET_AX *src, size_t size)
1391 struct CadetTunnelAxolotl *ax;
1392 struct GNUNET_CADET_Hash msg_hmac;
1393 struct GNUNET_HashCode hmac;
1394 struct GNUNET_CADET_AX *dstmsg;
1402 esize = size - sizeof (struct GNUNET_CADET_AX);
1407 /* Try current HK */
1408 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &ax->HKr, &msg_hmac);
1409 if (0 != memcmp (&msg_hmac, &src->hmac, sizeof (msg_hmac)))
1411 static const char ctx[] = "axolotl ratchet";
1412 struct GNUNET_CRYPTO_SymmetricSessionKey keys[3]; /* RKp, NHKp, CKp */
1413 struct GNUNET_CRYPTO_SymmetricSessionKey HK;
1414 struct GNUNET_HashCode dh;
1415 struct GNUNET_CRYPTO_EcdhePublicKey *DHRp;
1418 t_hmac (&src->Ns, AX_HEADER_SIZE + esize, 0, &ax->NHKr, &msg_hmac);
1419 if (0 != memcmp (&msg_hmac, &src->hmac, sizeof (msg_hmac)))
1421 /* Try the skipped keys, if that fails, we're out of luck. */
1422 return try_old_ax_keys (t, dst, src, size);
1424 LOG (GNUNET_ERROR_TYPE_INFO, "next HK\n");
1428 t_h_decrypt (t, src, dstmsg);
1429 Np = ntohl (dstmsg->Ns);
1430 PNp = ntohl (dstmsg->PNs);
1431 DHRp = &dstmsg->DHRs;
1432 store_ax_keys (t, &HK, ax->Nr, PNp, &ax->CKr);
1434 /* RKp, NHKp, CKp = KDF (HMAC-HASH (RK, DH (DHRp, DHRs))) */
1435 GNUNET_CRYPTO_ecc_ecdh (ax->DHRs, DHRp, &dh);
1436 t_ax_hmac_hash (&ax->RK, &hmac, &dh, sizeof (dh));
1437 GNUNET_CRYPTO_kdf (keys, sizeof (keys), ctx, sizeof (ctx),
1438 &hmac, sizeof (hmac), NULL);
1440 /* Commit "purported" keys */
1449 LOG (GNUNET_ERROR_TYPE_DEBUG, "current HK\n");
1450 t_h_decrypt (t, src, dstmsg);
1451 Np = ntohl (dstmsg->Ns);
1452 PNp = ntohl (dstmsg->PNs);
1455 if (Np > ax->Nr + 1)
1456 store_ax_keys (t, &ax->HKr, ax->Nr, Np, &ax->CKr);
1460 osize = t_ax_decrypt (t, dst, &src[1], esize);
1463 GNUNET_break_op (0);
1472 * Create key material by doing ECDH on the local and remote ephemeral keys.
1474 * @param key_material Where to store the key material.
1475 * @param ephemeral Peer's public ephemeral key.
1477 * @return GNUNET_OK if it went fine, GNUNET_SYSERR otherwise.
1480 derive_otr_key_material (struct GNUNET_HashCode *key_material,
1481 const struct GNUNET_CRYPTO_EcdhePublicKey *ephemeral)
1484 GNUNET_CRYPTO_ecc_ecdh (otr_ephemeral_key, ephemeral, key_material))
1487 return GNUNET_SYSERR;
1494 * Create a symmetic key from the identities of both ends and the key material
1497 * @param key Destination for the generated key.
1498 * @param sender ID of the peer that will encrypt with @c key.
1499 * @param receiver ID of the peer that will decrypt with @c key.
1500 * @param key_material Hash created with ECDH with the ephemeral keys.
1503 derive_symmertic (struct GNUNET_CRYPTO_SymmetricSessionKey *key,
1504 const struct GNUNET_PeerIdentity *sender,
1505 const struct GNUNET_PeerIdentity *receiver,
1506 const struct GNUNET_HashCode *key_material)
1508 const char salt[] = "CADET kx salt";
1510 GNUNET_CRYPTO_kdf (key, sizeof (struct GNUNET_CRYPTO_SymmetricSessionKey),
1511 salt, sizeof (salt),
1512 key_material, sizeof (struct GNUNET_HashCode),
1513 sender, sizeof (struct GNUNET_PeerIdentity),
1514 receiver, sizeof (struct GNUNET_PeerIdentity),
1520 * Derive the tunnel's keys using our own and the peer's ephemeral keys.
1522 * @param t Tunnel for which to create the keys.
1524 * @return GNUNET_OK if successful, GNUNET_SYSERR otherwise.
1527 create_otr_keys (struct CadetTunnel *t)
1529 struct GNUNET_HashCode km;
1531 if (GNUNET_OK != derive_otr_key_material (&km, &t->peers_ephemeral_key))
1532 return GNUNET_SYSERR;
1533 derive_symmertic (&t->e_key, &my_full_id, GCP_get_id (t->peer), &km);
1534 derive_symmertic (&t->d_key, GCP_get_id (t->peer), &my_full_id, &km);
1535 #if DUMP_KEYS_TO_STDERR
1536 LOG (GNUNET_ERROR_TYPE_INFO, "ME: %s\n",
1537 GNUNET_h2s ((struct GNUNET_HashCode *) &otr_kx_msg.ephemeral_key));
1538 LOG (GNUNET_ERROR_TYPE_INFO, "PE: %s\n",
1539 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
1540 LOG (GNUNET_ERROR_TYPE_INFO, "KM: %s\n", GNUNET_h2s (&km));
1541 LOG (GNUNET_ERROR_TYPE_INFO, "EK: %s\n",
1542 GNUNET_h2s ((struct GNUNET_HashCode *) &t->e_key));
1543 LOG (GNUNET_ERROR_TYPE_INFO, "DK: %s\n",
1544 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
1551 * Create a new Key eXchange context for the tunnel.
1553 * If the old keys were verified, keep them for old traffic. Create a new KX
1554 * timestamp and a new nonce.
1556 * @param t Tunnel for which to create the KX ctx.
1558 * @return GNUNET_OK if successful, GNUNET_SYSERR otherwise.
1561 create_kx_ctx (struct CadetTunnel *t)
1563 LOG (GNUNET_ERROR_TYPE_INFO, " new kx ctx for %s\n", GCT_2s (t));
1565 if (NULL != t->kx_ctx)
1567 if (NULL != t->kx_ctx->finish_task)
1569 LOG (GNUNET_ERROR_TYPE_INFO, " resetting exisiting finish task\n");
1570 GNUNET_SCHEDULER_cancel (t->kx_ctx->finish_task);
1571 t->kx_ctx->finish_task = NULL;
1576 t->kx_ctx = GNUNET_new (struct CadetTunnelKXCtx);
1577 t->kx_ctx->challenge = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE,
1581 if (CADET_TUNNEL_KEY_OK == t->estate)
1583 LOG (GNUNET_ERROR_TYPE_INFO, " backing up keys\n");
1584 t->kx_ctx->d_key_old = t->d_key;
1585 t->kx_ctx->e_key_old = t->e_key;
1588 LOG (GNUNET_ERROR_TYPE_INFO, " old keys not valid, not saving\n");
1589 t->kx_ctx->rekey_start_time = GNUNET_TIME_absolute_get ();
1590 return create_otr_keys (t);
1595 * @brief Finish the Key eXchange and destroy the old keys.
1597 * @param cls Closure (Tunnel for which to finish the KX).
1598 * @param tc Task context.
1601 finish_kx (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
1603 struct CadetTunnel *t = cls;
1605 LOG (GNUNET_ERROR_TYPE_INFO, "finish KX for %s\n", GCT_2s (t));
1607 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
1609 LOG (GNUNET_ERROR_TYPE_INFO, " shutdown\n");
1613 GNUNET_free (t->kx_ctx);
1619 * Destroy a Key eXchange context for the tunnel. This function only schedules
1620 * the destruction, the freeing of the memory (and clearing of old key material)
1621 * happens after a delay!
1623 * @param t Tunnel whose KX ctx to destroy.
1626 destroy_kx_ctx (struct CadetTunnel *t)
1628 struct GNUNET_TIME_Relative delay;
1630 if (NULL == t->kx_ctx || NULL != t->kx_ctx->finish_task)
1633 if (is_key_null (&t->kx_ctx->e_key_old))
1635 t->kx_ctx->finish_task = GNUNET_SCHEDULER_add_now (finish_kx, t);
1639 delay = GNUNET_TIME_relative_divide (rekey_period, 4);
1640 delay = GNUNET_TIME_relative_min (delay, GNUNET_TIME_UNIT_MINUTES);
1642 t->kx_ctx->finish_task = GNUNET_SCHEDULER_add_delayed (delay, finish_kx, t);
1648 * Pick a connection on which send the next data message.
1650 * @param t Tunnel on which to send the message.
1652 * @return The connection on which to send the next message.
1654 static struct CadetConnection *
1655 tunnel_get_connection (struct CadetTunnel *t)
1657 struct CadetTConnection *iter;
1658 struct CadetConnection *best;
1660 unsigned int lowest_q;
1662 LOG (GNUNET_ERROR_TYPE_DEBUG, "tunnel_get_connection %s\n", GCT_2s (t));
1664 lowest_q = UINT_MAX;
1665 for (iter = t->connection_head; NULL != iter; iter = iter->next)
1667 LOG (GNUNET_ERROR_TYPE_DEBUG, " connection %s: %u\n",
1668 GCC_2s (iter->c), GCC_get_state (iter->c));
1669 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
1671 qn = GCC_get_qn (iter->c, GCC_is_origin (iter->c, GNUNET_YES));
1672 LOG (GNUNET_ERROR_TYPE_DEBUG, " q_n %u, \n", qn);
1680 LOG (GNUNET_ERROR_TYPE_DEBUG, " selected: connection %s\n", GCC_2s (best));
1686 * Callback called when a queued message is sent.
1688 * Calculates the average time and connection packet tracking.
1690 * @param cls Closure (TunnelQueue handle).
1691 * @param c Connection this message was on.
1692 * @param q Connection queue handle (unused).
1693 * @param type Type of message sent.
1694 * @param fwd Was this a FWD going message?
1695 * @param size Size of the message.
1698 tun_message_sent (void *cls,
1699 struct CadetConnection *c,
1700 struct CadetConnectionQueue *q,
1701 uint16_t type, int fwd, size_t size)
1703 struct CadetTunnelQueue *qt = cls;
1704 struct CadetTunnel *t;
1706 LOG (GNUNET_ERROR_TYPE_DEBUG, "tun_message_sent\n");
1708 GNUNET_assert (NULL != qt->cont);
1709 t = NULL == c ? NULL : GCC_get_tunnel (c);
1710 qt->cont (qt->cont_cls, t, qt, type, size);
1716 count_queued_data (const struct CadetTunnel *t)
1718 struct CadetTunnelDelayed *iter;
1721 for (count = 0, iter = t->tq_head; iter != NULL; iter = iter->next)
1728 * Delete a queued message: either was sent or the channel was destroyed
1729 * before the tunnel's key exchange had a chance to finish.
1731 * @param tqd Delayed queue handle.
1734 unqueue_data (struct CadetTunnelDelayed *tqd)
1736 GNUNET_CONTAINER_DLL_remove (tqd->t->tq_head, tqd->t->tq_tail, tqd);
1742 * Cache a message to be sent once tunnel is online.
1744 * @param t Tunnel to hold the message.
1745 * @param msg Message itself (copy will be made).
1747 static struct CadetTunnelDelayed *
1748 queue_data (struct CadetTunnel *t, const struct GNUNET_MessageHeader *msg)
1750 struct CadetTunnelDelayed *tqd;
1751 uint16_t size = ntohs (msg->size);
1753 LOG (GNUNET_ERROR_TYPE_DEBUG, "queue data on Tunnel %s\n", GCT_2s (t));
1755 if (GNUNET_YES == is_ready (t))
1761 tqd = GNUNET_malloc (sizeof (struct CadetTunnelDelayed) + size);
1764 memcpy (&tqd[1], msg, size);
1765 GNUNET_CONTAINER_DLL_insert_tail (t->tq_head, t->tq_tail, tqd);
1771 * Sends an already built message on a tunnel, encrypting it and
1772 * choosing the best connection.
1774 * @param message Message to send. Function modifies it.
1775 * @param t Tunnel on which this message is transmitted.
1776 * @param c Connection to use (autoselect if NULL).
1777 * @param force Force the tunnel to take the message (buffer overfill).
1778 * @param cont Continuation to call once message is really sent.
1779 * @param cont_cls Closure for @c cont.
1780 * @param existing_q In case this a transmission of previously queued data,
1781 * this should be TunnelQueue given to the client.
1784 * @return Handle to cancel message.
1785 * NULL if @c cont is NULL or an error happens and message is dropped.
1787 static struct CadetTunnelQueue *
1788 send_prebuilt_message (const struct GNUNET_MessageHeader *message,
1789 struct CadetTunnel *t, struct CadetConnection *c,
1790 int force, GCT_sent cont, void *cont_cls,
1791 struct CadetTunnelQueue *existing_q)
1793 struct GNUNET_MessageHeader *msg;
1794 struct GNUNET_CADET_Encrypted *otr_msg;
1795 struct GNUNET_CADET_AX *ax_msg;
1796 struct CadetTunnelQueue *tq;
1797 size_t size = ntohs (message->size);
1798 const uint16_t max_overhead = sizeof (struct GNUNET_CADET_Encrypted)
1799 + sizeof (struct GNUNET_CADET_AX);
1800 char cbuf[max_overhead + size];
1807 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT Send on Tunnel %s\n", GCT_2s (t));
1809 if (GNUNET_NO == is_ready (t))
1811 struct CadetTunnelDelayed *tqd;
1812 /* A non null existing_q indicates sending of queued data.
1813 * Should only happen after tunnel becomes ready.
1815 GNUNET_assert (NULL == existing_q);
1816 tqd = queue_data (t, message);
1819 tq = GNUNET_new (struct CadetTunnelQueue);
1823 tq->cont_cls = cont_cls;
1827 GNUNET_assert (GNUNET_NO == GCT_is_loopback (t));
1829 if (CADET_Axolotl == t->enc_type)
1831 ax_msg = (struct GNUNET_CADET_AX *) cbuf;
1832 msg = &ax_msg->header;
1833 msg->size = htons (sizeof (struct GNUNET_CADET_AX) + size);
1834 msg->type = htons (GNUNET_MESSAGE_TYPE_CADET_AX);
1835 esize = t_ax_encrypt (t, &ax_msg[1], message, size);
1836 ax_msg->Ns = htonl (t->ax->Ns++);
1837 ax_msg->PNs = htonl (t->ax->PNs);
1838 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &ax_msg->DHRs);
1839 t_h_encrypt (t, ax_msg);
1840 t_hmac (&ax_msg->Ns, AX_HEADER_SIZE + esize, 0, &t->ax->HKs, &ax_msg->hmac);
1844 otr_msg = (struct GNUNET_CADET_Encrypted *) cbuf;
1845 msg = &otr_msg->header;
1846 iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
1848 esize = t_encrypt (t, &otr_msg[1], message, size, iv, GNUNET_NO);
1849 t_hmac (&otr_msg[1], size, iv, select_key (t), &otr_msg->hmac);
1850 msg->size = htons (sizeof (struct GNUNET_CADET_Encrypted) + size);
1851 msg->type = htons (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED);
1853 GNUNET_assert (esize == size);
1856 c = tunnel_get_connection (t);
1859 /* Why is tunnel 'ready'? Should have been queued! */
1860 if (NULL != t->destroy_task)
1863 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
1865 return NULL; /* Drop... */
1869 type = ntohs (message->type);
1872 case GNUNET_MESSAGE_TYPE_CADET_DATA:
1873 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
1874 if (GNUNET_MESSAGE_TYPE_CADET_DATA == type)
1875 mid = ntohl (((struct GNUNET_CADET_Data *) message)->mid);
1877 mid = ntohl (((struct GNUNET_CADET_DataACK *) message)->mid);
1879 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
1880 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
1881 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
1882 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
1883 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
1887 LOG (GNUNET_ERROR_TYPE_ERROR, "type %s not valid\n", GC_m2s (type));
1889 LOG (GNUNET_ERROR_TYPE_DEBUG, "type %s\n", GC_m2s (type));
1891 fwd = GCC_is_origin (c, GNUNET_YES);
1895 GNUNET_break (NULL == GCC_send_prebuilt_message (msg, type,
1896 mid, c, fwd, force, NULL, NULL));
1899 if (NULL == existing_q)
1901 tq = GNUNET_new (struct CadetTunnelQueue); /* FIXME valgrind: leak*/
1908 tq->cq = GCC_send_prebuilt_message (msg, type, mid, c, fwd, force,
1909 &tun_message_sent, tq);
1910 GNUNET_assert (NULL != tq->cq);
1912 tq->cont_cls = cont_cls;
1919 * Send all cached messages that we can, tunnel is online.
1921 * @param t Tunnel that holds the messages. Cannot be loopback.
1924 send_queued_data (struct CadetTunnel *t)
1926 struct CadetTunnelDelayed *tqd;
1927 struct CadetTunnelDelayed *next;
1930 LOG (GNUNET_ERROR_TYPE_INFO, "Send queued data, tunnel %s\n", GCT_2s (t));
1932 if (GCT_is_loopback (t))
1938 if (GNUNET_NO == is_ready (t))
1940 LOG (GNUNET_ERROR_TYPE_DEBUG, " not ready yet: %s/%s\n",
1941 estate2s (t->estate), cstate2s (t->cstate));
1945 room = GCT_get_connections_buffer (t);
1946 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer space: %u\n", room);
1947 LOG (GNUNET_ERROR_TYPE_DEBUG, " tq head: %p\n", t->tq_head);
1948 for (tqd = t->tq_head; NULL != tqd && room > 0; tqd = next)
1950 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending queued data\n");
1953 send_prebuilt_message ((struct GNUNET_MessageHeader *) &tqd[1],
1954 tqd->t, NULL, GNUNET_YES,
1955 NULL != tqd->tq ? tqd->tq->cont : NULL,
1956 NULL != tqd->tq ? tqd->tq->cont_cls : NULL,
1960 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_send_queued_data end\n", GCP_2s (t->peer));
1965 * Callback called when a queued message is sent.
1967 * @param cls Closure.
1968 * @param c Connection this message was on.
1969 * @param type Type of message sent.
1970 * @param fwd Was this a FWD going message?
1971 * @param size Size of the message.
1974 ephm_sent (void *cls,
1975 struct CadetConnection *c,
1976 struct CadetConnectionQueue *q,
1977 uint16_t type, int fwd, size_t size)
1979 struct CadetTunnel *t = cls;
1980 LOG (GNUNET_ERROR_TYPE_DEBUG, "ephemeral sent %s\n", GC_m2s (type));
1985 * Callback called when a queued message is sent.
1987 * @param cls Closure.
1988 * @param c Connection this message was on.
1989 * @param type Type of message sent.
1990 * @param fwd Was this a FWD going message?
1991 * @param size Size of the message.
1994 pong_sent (void *cls,
1995 struct CadetConnection *c,
1996 struct CadetConnectionQueue *q,
1997 uint16_t type, int fwd, size_t size)
1999 struct CadetTunnel *t = cls;
2000 LOG (GNUNET_ERROR_TYPE_DEBUG, "pong_sent %s\n", GC_m2s (type));
2006 * Sends key exchange message on a tunnel, choosing the best connection.
2007 * Should not be called on loopback tunnels.
2009 * @param t Tunnel on which this message is transmitted.
2010 * @param message Message to send. Function modifies it.
2012 * @return Handle to the message in the connection queue.
2014 static struct CadetConnectionQueue *
2015 send_kx (struct CadetTunnel *t,
2016 const struct GNUNET_MessageHeader *message)
2018 struct CadetConnection *c;
2019 struct GNUNET_CADET_KX *msg;
2020 size_t size = ntohs (message->size);
2021 char cbuf[sizeof (struct GNUNET_CADET_KX) + size];
2026 LOG (GNUNET_ERROR_TYPE_DEBUG, "GMT KX on Tunnel %s\n", GCT_2s (t));
2028 /* Avoid loopback. */
2029 if (GCT_is_loopback (t))
2034 type = ntohs (message->type);
2036 /* Even if tunnel is "being destroyed", send anyway.
2037 * Could be a response to a rekey initiated by remote peer,
2038 * who is trying to create a new channel!
2041 /* Must have a connection, or be looking for one. */
2042 if (NULL == t->connection_head)
2044 LOG (GNUNET_ERROR_TYPE_DEBUG, "%s with no connection\n", GC_m2s (type));
2045 if (CADET_TUNNEL_SEARCHING != t->cstate)
2048 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
2049 GCP_debug (t->peer, GNUNET_ERROR_TYPE_ERROR);
2054 msg = (struct GNUNET_CADET_KX *) cbuf;
2055 msg->header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX);
2056 msg->header.size = htons (sizeof (struct GNUNET_CADET_KX) + size);
2057 c = tunnel_get_connection (t);
2060 if (NULL == t->destroy_task && CADET_TUNNEL_READY == t->cstate)
2063 GCT_debug (t, GNUNET_ERROR_TYPE_ERROR);
2069 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
2070 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
2071 GNUNET_assert (NULL == t->ephm_h);
2074 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
2075 GNUNET_assert (NULL == t->pong_h);
2080 LOG (GNUNET_ERROR_TYPE_DEBUG, "unkown type %s\n", GC_m2s (type));
2083 memcpy (&msg[1], message, size);
2085 fwd = GCC_is_origin (c, GNUNET_YES);
2087 return GCC_send_prebuilt_message (&msg->header, type, 0, c,
2094 * Send the ephemeral key on a tunnel.
2096 * @param t Tunnel on which to send the key.
2099 send_ephemeral (struct CadetTunnel *t)
2101 LOG (GNUNET_ERROR_TYPE_INFO, "===> EPHM for %s\n", GCT_2s (t));
2102 if (NULL != t->ephm_h)
2104 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
2108 otr_kx_msg.sender_status = htonl (t->estate);
2109 otr_kx_msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2110 otr_kx_msg.nonce = t->kx_ctx->challenge;
2111 LOG (GNUNET_ERROR_TYPE_DEBUG, " send nonce c %u\n", otr_kx_msg.nonce);
2112 t_encrypt (t, &otr_kx_msg.nonce, &otr_kx_msg.nonce,
2113 ping_encryption_size(), otr_kx_msg.iv, GNUNET_YES);
2114 LOG (GNUNET_ERROR_TYPE_DEBUG, " send nonce e %u\n", otr_kx_msg.nonce);
2115 t->ephm_h = send_kx (t, &otr_kx_msg.header);
2120 * Send a pong message on a tunnel.
2122 * @param t Tunnel on which to send the pong.
2123 * @param challenge Value sent in the ping that we have to send back.
2126 send_pong (struct CadetTunnel *t, uint32_t challenge)
2128 struct GNUNET_CADET_KX_Pong msg;
2130 LOG (GNUNET_ERROR_TYPE_INFO, "===> PONG for %s\n", GCT_2s (t));
2131 if (NULL != t->pong_h)
2133 LOG (GNUNET_ERROR_TYPE_INFO, " already queued\n");
2136 msg.header.size = htons (sizeof (msg));
2137 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_PONG);
2138 msg.iv = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_NONCE, UINT32_MAX);
2139 msg.nonce = challenge;
2140 LOG (GNUNET_ERROR_TYPE_DEBUG, " sending %u\n", msg.nonce);
2141 t_encrypt (t, &msg.nonce, &msg.nonce,
2142 sizeof (msg.nonce), msg.iv, GNUNET_YES);
2143 LOG (GNUNET_ERROR_TYPE_DEBUG, " e sending %u\n", msg.nonce);
2145 t->pong_h = send_kx (t, &msg.header);
2150 * Initiate a rekey with the remote peer.
2152 * @param cls Closure (tunnel).
2153 * @param tc TaskContext.
2156 rekey_tunnel (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2158 struct CadetTunnel *t = cls;
2160 t->rekey_task = NULL;
2162 LOG (GNUNET_ERROR_TYPE_INFO, "Re-key Tunnel %s\n", GCT_2s (t));
2163 if (NULL != tc && 0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
2166 GNUNET_assert (NULL != t->kx_ctx);
2167 struct GNUNET_TIME_Relative duration;
2169 duration = GNUNET_TIME_absolute_get_duration (t->kx_ctx->rekey_start_time);
2170 LOG (GNUNET_ERROR_TYPE_DEBUG, " kx started %s ago\n",
2171 GNUNET_STRINGS_relative_time_to_string (duration, GNUNET_YES));
2173 // FIXME make duration of old keys configurable
2174 if (duration.rel_value_us >= GNUNET_TIME_UNIT_MINUTES.rel_value_us)
2176 LOG (GNUNET_ERROR_TYPE_DEBUG, " deleting old keys\n");
2177 memset (&t->kx_ctx->d_key_old, 0, sizeof (t->kx_ctx->d_key_old));
2178 memset (&t->kx_ctx->e_key_old, 0, sizeof (t->kx_ctx->e_key_old));
2185 case CADET_TUNNEL_KEY_UNINITIALIZED:
2186 GCT_change_estate (t, CADET_TUNNEL_KEY_SENT);
2189 case CADET_TUNNEL_KEY_SENT:
2192 case CADET_TUNNEL_KEY_OK:
2194 * - state should have changed during rekey_iterator
2195 * - task should have been canceled at pong_handle
2198 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
2201 case CADET_TUNNEL_KEY_PING:
2202 case CADET_TUNNEL_KEY_REKEY:
2206 LOG (GNUNET_ERROR_TYPE_DEBUG, "Unexpected state %u\n", t->estate);
2209 // FIXME exponential backoff
2210 struct GNUNET_TIME_Relative delay;
2212 delay = GNUNET_TIME_relative_divide (rekey_period, 16);
2213 delay = GNUNET_TIME_relative_min (delay, REKEY_WAIT);
2214 LOG (GNUNET_ERROR_TYPE_DEBUG, " next call in %s\n",
2215 GNUNET_STRINGS_relative_time_to_string (delay, GNUNET_YES));
2216 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
2221 * Our ephemeral key has changed, create new session key on all tunnels.
2223 * Each tunnel will start the Key Exchange with a random delay between
2224 * 0 and number_of_tunnels*100 milliseconds, so there are 10 key exchanges
2225 * per second, on average.
2227 * @param cls Closure (size of the hashmap).
2228 * @param key Current public key.
2229 * @param value Value in the hash map (tunnel).
2231 * @return #GNUNET_YES, so we should continue to iterate,
2234 rekey_iterator (void *cls,
2235 const struct GNUNET_PeerIdentity *key,
2238 struct CadetTunnel *t = value;
2239 struct GNUNET_TIME_Relative delay;
2240 long n = (long) cls;
2243 if (NULL != t->rekey_task)
2246 if (GNUNET_YES == GCT_is_loopback (t))
2249 if (CADET_OTR != t->enc_type)
2252 r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK, (uint32_t) n * 100);
2253 delay = GNUNET_TIME_relative_multiply (GNUNET_TIME_UNIT_MILLISECONDS, r);
2254 t->rekey_task = GNUNET_SCHEDULER_add_delayed (delay, &rekey_tunnel, t);
2255 if (GNUNET_OK == create_kx_ctx (t))
2256 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
2268 * Create a new ephemeral key and key message, schedule next rekeying.
2270 * @param cls Closure (unused).
2271 * @param tc TaskContext.
2274 global_otr_rekey (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
2276 struct GNUNET_TIME_Absolute time;
2281 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
2284 GNUNET_free_non_null (otr_ephemeral_key);
2285 otr_ephemeral_key = GNUNET_CRYPTO_ecdhe_key_create ();
2287 time = GNUNET_TIME_absolute_get ();
2288 otr_kx_msg.creation_time = GNUNET_TIME_absolute_hton (time);
2289 time = GNUNET_TIME_absolute_add (time, rekey_period);
2290 time = GNUNET_TIME_absolute_add (time, GNUNET_TIME_UNIT_MINUTES);
2291 otr_kx_msg.expiration_time = GNUNET_TIME_absolute_hton (time);
2292 GNUNET_CRYPTO_ecdhe_key_get_public (otr_ephemeral_key, &otr_kx_msg.ephemeral_key);
2293 LOG (GNUNET_ERROR_TYPE_INFO, "GLOBAL OTR RE-KEY, NEW EPHM: %s\n",
2294 GNUNET_h2s ((struct GNUNET_HashCode *) &otr_kx_msg.ephemeral_key));
2296 GNUNET_assert (GNUNET_OK ==
2297 GNUNET_CRYPTO_eddsa_sign (id_key,
2298 &otr_kx_msg.purpose,
2299 &otr_kx_msg.signature));
2301 n = (long) GNUNET_CONTAINER_multipeermap_size (tunnels);
2302 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &rekey_iterator, (void *) n);
2304 rekey_task = GNUNET_SCHEDULER_add_delayed (rekey_period,
2305 &global_otr_rekey, NULL);
2310 * Called only on shutdown, destroy every tunnel.
2312 * @param cls Closure (unused).
2313 * @param key Current public key.
2314 * @param value Value in the hash map (tunnel).
2316 * @return #GNUNET_YES, so we should continue to iterate,
2319 destroy_iterator (void *cls,
2320 const struct GNUNET_PeerIdentity *key,
2323 struct CadetTunnel *t = value;
2325 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_shutdown destroying tunnel at %p\n", t);
2332 * Notify remote peer that we don't know a channel he is talking about,
2333 * probably CHANNEL_DESTROY was missed.
2335 * @param t Tunnel on which to notify.
2336 * @param gid ID of the channel.
2339 send_channel_destroy (struct CadetTunnel *t, unsigned int gid)
2341 struct GNUNET_CADET_ChannelManage msg;
2343 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY);
2344 msg.header.size = htons (sizeof (msg));
2345 msg.chid = htonl (gid);
2347 LOG (GNUNET_ERROR_TYPE_DEBUG,
2348 "WARNING destroying unknown channel %u on tunnel %s\n",
2350 send_prebuilt_message (&msg.header, t, NULL, GNUNET_YES, NULL, NULL, NULL);
2355 * Demultiplex data per channel and call appropriate channel handler.
2357 * @param t Tunnel on which the data came.
2358 * @param msg Data message.
2359 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2360 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2361 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2362 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2365 handle_data (struct CadetTunnel *t,
2366 const struct GNUNET_CADET_Data *msg,
2369 struct CadetChannel *ch;
2373 size = ntohs (msg->header.size);
2375 sizeof (struct GNUNET_CADET_Data) +
2376 sizeof (struct GNUNET_MessageHeader))
2381 LOG (GNUNET_ERROR_TYPE_DEBUG, " payload of type %s\n",
2382 GC_m2s (ntohs (msg[1].header.type)));
2385 ch = GCT_get_channel (t, ntohl (msg->chid));
2388 GNUNET_STATISTICS_update (stats, "# data on unknown channel",
2390 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel 0x%X unknown\n",
2392 send_channel_destroy (t, ntohl (msg->chid));
2396 GCCH_handle_data (ch, msg, fwd);
2401 * Demultiplex data ACKs per channel and update appropriate channel buffer info.
2403 * @param t Tunnel on which the DATA ACK came.
2404 * @param msg DATA ACK message.
2405 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2406 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2407 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2408 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2411 handle_data_ack (struct CadetTunnel *t,
2412 const struct GNUNET_CADET_DataACK *msg,
2415 struct CadetChannel *ch;
2419 size = ntohs (msg->header.size);
2420 if (size != sizeof (struct GNUNET_CADET_DataACK))
2427 ch = GCT_get_channel (t, ntohl (msg->chid));
2430 GNUNET_STATISTICS_update (stats, "# data ack on unknown channel",
2432 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
2437 GCCH_handle_data_ack (ch, msg, fwd);
2442 * Handle channel create.
2444 * @param t Tunnel on which the data came.
2445 * @param msg Data message.
2448 handle_ch_create (struct CadetTunnel *t,
2449 const struct GNUNET_CADET_ChannelCreate *msg)
2451 struct CadetChannel *ch;
2455 size = ntohs (msg->header.size);
2456 if (size != sizeof (struct GNUNET_CADET_ChannelCreate))
2463 ch = GCT_get_channel (t, ntohl (msg->chid));
2464 if (NULL != ch && ! GCT_is_loopback (t))
2466 /* Probably a retransmission, safe to ignore */
2467 LOG (GNUNET_ERROR_TYPE_DEBUG, " already exists...\n");
2469 ch = GCCH_handle_create (t, msg);
2471 GCT_add_channel (t, ch);
2477 * Handle channel NACK: check correctness and call channel handler for NACKs.
2479 * @param t Tunnel on which the NACK came.
2480 * @param msg NACK message.
2483 handle_ch_nack (struct CadetTunnel *t,
2484 const struct GNUNET_CADET_ChannelManage *msg)
2486 struct CadetChannel *ch;
2490 size = ntohs (msg->header.size);
2491 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
2498 ch = GCT_get_channel (t, ntohl (msg->chid));
2501 GNUNET_STATISTICS_update (stats, "# channel NACK on unknown channel",
2503 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
2508 GCCH_handle_nack (ch);
2513 * Handle a CHANNEL ACK (SYNACK/ACK).
2515 * @param t Tunnel on which the CHANNEL ACK came.
2516 * @param msg CHANNEL ACK message.
2517 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2518 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2519 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2520 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2523 handle_ch_ack (struct CadetTunnel *t,
2524 const struct GNUNET_CADET_ChannelManage *msg,
2527 struct CadetChannel *ch;
2531 size = ntohs (msg->header.size);
2532 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
2539 ch = GCT_get_channel (t, ntohl (msg->chid));
2542 GNUNET_STATISTICS_update (stats, "# channel ack on unknown channel",
2544 LOG (GNUNET_ERROR_TYPE_DEBUG, "WARNING channel %u unknown\n",
2549 GCCH_handle_ack (ch, msg, fwd);
2554 * Handle a channel destruction message.
2556 * @param t Tunnel on which the message came.
2557 * @param msg Channel destroy message.
2558 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2559 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2560 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2561 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2564 handle_ch_destroy (struct CadetTunnel *t,
2565 const struct GNUNET_CADET_ChannelManage *msg,
2568 struct CadetChannel *ch;
2572 size = ntohs (msg->header.size);
2573 if (size != sizeof (struct GNUNET_CADET_ChannelManage))
2580 ch = GCT_get_channel (t, ntohl (msg->chid));
2583 /* Probably a retransmission, safe to ignore */
2587 GCCH_handle_destroy (ch, msg, fwd);
2592 * Create a new Axolotl ephemeral (ratchet) key.
2597 new_ephemeral (struct CadetTunnel *t)
2599 GNUNET_free_non_null (t->ax->DHRs);
2600 t->ax->DHRs = GNUNET_CRYPTO_ecdhe_key_create();
2605 * Free Axolotl data.
2610 destroy_ax (struct CadetTunnel *t)
2615 GNUNET_free_non_null (t->ax->DHRs);
2616 GNUNET_free_non_null (t->ax->kx_0);
2618 GNUNET_free (t->ax);
2625 * The peer's ephemeral key has changed: update the symmetrical keys.
2627 * @param t Tunnel this message came on.
2628 * @param msg Key eXchange message.
2631 handle_ephemeral (struct CadetTunnel *t,
2632 const struct GNUNET_CADET_KX_Ephemeral *msg)
2634 LOG (GNUNET_ERROR_TYPE_INFO, "<=== EPHM for %s\n", GCT_2s (t));
2636 if (GNUNET_OK != check_ephemeral (t, msg))
2638 GNUNET_break_op (0);
2642 /* If we get a proper OTR-style ephemeral, fallback to old crypto. */
2646 t->enc_type = CADET_OTR;
2647 if (NULL != t->rekey_task)
2648 GNUNET_SCHEDULER_cancel (t->rekey_task);
2649 if (GNUNET_OK != create_kx_ctx (t))
2655 rekey_tunnel (t, NULL);
2659 * If the key is different from what we know, derive the new E/D keys.
2660 * Else destroy the rekey ctx (duplicate EPHM after successful KX).
2662 if (0 != memcmp (&t->peers_ephemeral_key, &msg->ephemeral_key,
2663 sizeof (msg->ephemeral_key)))
2665 #if DUMP_KEYS_TO_STDERR
2666 LOG (GNUNET_ERROR_TYPE_INFO, "OLD: %s\n",
2667 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
2668 LOG (GNUNET_ERROR_TYPE_INFO, "NEW: %s\n",
2669 GNUNET_h2s ((struct GNUNET_HashCode *) &msg->ephemeral_key));
2671 t->peers_ephemeral_key = msg->ephemeral_key;
2673 if (GNUNET_OK != create_kx_ctx (t))
2680 if (CADET_TUNNEL_KEY_OK == t->estate)
2682 GCT_change_estate (t, CADET_TUNNEL_KEY_REKEY);
2684 if (NULL != t->rekey_task)
2685 GNUNET_SCHEDULER_cancel (t->rekey_task);
2686 t->rekey_task = GNUNET_SCHEDULER_add_now (rekey_tunnel, t);
2688 if (CADET_TUNNEL_KEY_SENT == t->estate)
2690 LOG (GNUNET_ERROR_TYPE_DEBUG, " our key was sent, sending challenge\n");
2692 GCT_change_estate (t, CADET_TUNNEL_KEY_PING);
2695 if (CADET_TUNNEL_KEY_UNINITIALIZED != ntohl(msg->sender_status))
2699 LOG (GNUNET_ERROR_TYPE_DEBUG, " recv nonce e %u\n", msg->nonce);
2700 t_decrypt (t, &nonce, &msg->nonce, ping_encryption_size (), msg->iv);
2701 LOG (GNUNET_ERROR_TYPE_DEBUG, " recv nonce c %u\n", nonce);
2702 send_pong (t, nonce);
2708 * Peer has answer to our challenge.
2709 * If answer is successful, consider the key exchange finished and clean
2710 * up all related state.
2712 * @param t Tunnel this message came on.
2713 * @param msg Key eXchange Pong message.
2716 handle_pong (struct CadetTunnel *t, const struct GNUNET_CADET_KX_Pong *msg)
2720 LOG (GNUNET_ERROR_TYPE_INFO, "<=== PONG for %s\n", GCT_2s (t));
2721 if (NULL == t->rekey_task)
2723 GNUNET_STATISTICS_update (stats, "# duplicate PONG messages", 1, GNUNET_NO);
2726 if (NULL == t->kx_ctx)
2728 GNUNET_STATISTICS_update (stats, "# stray PONG messages", 1, GNUNET_NO);
2732 t_decrypt (t, &challenge, &msg->nonce, sizeof (uint32_t), msg->iv);
2733 if (challenge != t->kx_ctx->challenge)
2735 LOG (GNUNET_ERROR_TYPE_WARNING, "Wrong PONG challenge on %s\n", GCT_2s (t));
2736 LOG (GNUNET_ERROR_TYPE_DEBUG, "PONG: %u (e: %u). Expected: %u.\n",
2737 challenge, msg->nonce, t->kx_ctx->challenge);
2741 GNUNET_SCHEDULER_cancel (t->rekey_task);
2742 t->rekey_task = NULL;
2744 /* Don't free the old keys right away, but after a delay.
2745 * Rationale: the KX could have happened over a very fast connection,
2746 * with payload traffic still signed with the old key stuck in a slower
2748 * Don't keep the keys longer than 1/4 the rekey period, and no longer than
2752 GCT_change_estate (t, CADET_TUNNEL_KEY_OK);
2757 * Handle Axolotl handshake.
2759 * @param t Tunnel this message came on.
2760 * @param msg Key eXchange Pong message.
2763 handle_kx_ax (struct CadetTunnel *t, const struct GNUNET_CADET_AX_KX *msg)
2765 struct CadetTunnelAxolotl *ax;
2766 struct GNUNET_HashCode key_material[3];
2767 struct GNUNET_CRYPTO_SymmetricSessionKey keys[5];
2768 const struct GNUNET_CRYPTO_EcdhePublicKey *pub;
2769 const struct GNUNET_CRYPTO_EcdhePrivateKey *priv;
2770 const char salt[] = "CADET Axolotl salt";
2771 const struct GNUNET_PeerIdentity *pid;
2774 LOG (GNUNET_ERROR_TYPE_INFO, "<=== AX_KX on %s\n", GCT_2s (t));
2778 /* Something is wrong if ax is NULL. Whose fault it is? */
2779 GNUNET_break_op (CADET_OTR == t->enc_type);
2780 GNUNET_break (CADET_Axolotl == t->enc_type);
2784 if (GNUNET_OK != GCP_check_key (t->peer, &msg->permanent_key,
2785 &msg->purpose, &msg->signature))
2787 GNUNET_break_op (0);
2791 pid = GCT_get_destination (t);
2792 if (0 > GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, pid))
2793 am_I_alice = GNUNET_YES;
2794 else if (0 < GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, pid))
2795 am_I_alice = GNUNET_NO;
2798 GNUNET_break_op (0);
2802 LOG (GNUNET_ERROR_TYPE_INFO, " is Alice? %s\n", am_I_alice ? "YES" : "NO");
2805 ax->DHRr = msg->ratchet_key;
2806 ax->DHIr = msg->permanent_key;
2809 if (GNUNET_YES == am_I_alice)
2811 priv = ax_key; /* A */
2812 pub = &msg->ephemeral_key; /* B0 */
2816 priv = ax->kx_0; /* B0 */
2817 pub = &ax->DHIr; /* A */
2819 GNUNET_CRYPTO_ecc_ecdh (priv, pub, &key_material[0]);
2822 if (GNUNET_YES == am_I_alice)
2824 priv = ax->kx_0; /* A0 */
2825 pub = &ax->DHIr; /* B */
2829 priv = ax_key; /* B */
2830 pub = &msg->ephemeral_key; /* A0 */
2832 GNUNET_CRYPTO_ecc_ecdh (priv, pub, &key_material[1]);
2835 priv = ax->kx_0; /* A0 or B0 */
2836 pub = &msg->ephemeral_key; /* B0 or A0 */
2837 GNUNET_CRYPTO_ecc_ecdh (priv, pub, &key_material[2]);
2839 #if DUMP_KEYS_TO_STDERR
2842 for (i = 0; i < 3; i++)
2843 LOG (GNUNET_ERROR_TYPE_INFO, "km[%u]: %s\n",
2844 i, GNUNET_h2s (&key_material[i]));
2849 GNUNET_CRYPTO_kdf (keys, sizeof (keys),
2850 salt, sizeof (salt),
2851 &key_material, sizeof (key_material), NULL);
2854 if (GNUNET_YES == am_I_alice)
2860 ax->ratchet_flag = GNUNET_YES;
2868 ax->ratchet_flag = GNUNET_NO;
2870 GCT_change_estate (t, CADET_TUNNEL_KEY_OK);
2875 * Demultiplex by message type and call appropriate handler for a message
2876 * towards a channel of a local tunnel.
2878 * @param t Tunnel this message came on.
2879 * @param msgh Message header.
2880 * @param fwd Is this message fwd? This only is meaningful in loopback channels.
2881 * #GNUNET_YES if message is FWD on the respective channel (loopback)
2882 * #GNUNET_NO if message is BCK on the respective channel (loopback)
2883 * #GNUNET_SYSERR if message on a one-ended channel (remote)
2886 handle_decrypted (struct CadetTunnel *t,
2887 const struct GNUNET_MessageHeader *msgh,
2892 type = ntohs (msgh->type);
2893 LOG (GNUNET_ERROR_TYPE_INFO, "<=== %s on %s\n", GC_m2s (type), GCT_2s (t));
2897 case GNUNET_MESSAGE_TYPE_CADET_KEEPALIVE:
2898 /* Do nothing, connection aleady got updated. */
2899 GNUNET_STATISTICS_update (stats, "# keepalives received", 1, GNUNET_NO);
2902 case GNUNET_MESSAGE_TYPE_CADET_DATA:
2903 /* Don't send hop ACK, wait for client to ACK */
2904 handle_data (t, (struct GNUNET_CADET_Data *) msgh, fwd);
2907 case GNUNET_MESSAGE_TYPE_CADET_DATA_ACK:
2908 handle_data_ack (t, (struct GNUNET_CADET_DataACK *) msgh, fwd);
2911 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_CREATE:
2912 handle_ch_create (t, (struct GNUNET_CADET_ChannelCreate *) msgh);
2915 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_NACK:
2916 handle_ch_nack (t, (struct GNUNET_CADET_ChannelManage *) msgh);
2919 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_ACK:
2920 handle_ch_ack (t, (struct GNUNET_CADET_ChannelManage *) msgh, fwd);
2923 case GNUNET_MESSAGE_TYPE_CADET_CHANNEL_DESTROY:
2924 handle_ch_destroy (t, (struct GNUNET_CADET_ChannelManage *) msgh, fwd);
2928 GNUNET_break_op (0);
2929 LOG (GNUNET_ERROR_TYPE_WARNING,
2930 "end-to-end message not known (%u)\n",
2931 ntohs (msgh->type));
2932 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
2936 /******************************************************************************/
2937 /******************************** API ***********************************/
2938 /******************************************************************************/
2940 * Decrypt old format and demultiplex by message type. Call appropriate handler
2941 * for a message towards a channel of a local tunnel.
2943 * @param t Tunnel this message came on.
2944 * @param msg Message header.
2947 GCT_handle_encrypted (struct CadetTunnel *t,
2948 const struct GNUNET_MessageHeader *msg)
2950 uint16_t size = ntohs (msg->size);
2952 size_t payload_size;
2955 struct GNUNET_MessageHeader *msgh;
2958 type = ntohs (msg->type);
2959 if (GNUNET_MESSAGE_TYPE_CADET_ENCRYPTED == type)
2961 const struct GNUNET_CADET_Encrypted *emsg;
2963 emsg = (struct GNUNET_CADET_Encrypted *) msg;
2964 payload_size = size - sizeof (struct GNUNET_CADET_Encrypted);
2965 decrypted_size = t_decrypt_and_validate (t, cbuf, &emsg[1], payload_size,
2966 emsg->iv, &emsg->hmac);
2968 else if (GNUNET_MESSAGE_TYPE_CADET_AX == type)
2970 const struct GNUNET_CADET_AX *emsg;
2972 emsg = (struct GNUNET_CADET_AX *) msg;
2973 decrypted_size = t_ax_decrypt_and_validate (t, cbuf, emsg, size);
2976 if (-1 == decrypted_size)
2978 GNUNET_break_op (0);
2983 while (off < decrypted_size)
2987 msgh = (struct GNUNET_MessageHeader *) &cbuf[off];
2988 msize = ntohs (msgh->size);
2989 if (msize < sizeof (struct GNUNET_MessageHeader))
2991 GNUNET_break_op (0);
2994 handle_decrypted (t, msgh, GNUNET_SYSERR);
3001 * Demultiplex an encapsulated KX message by message type.
3003 * @param t Tunnel on which the message came.
3004 * @param message Payload of KX message.
3007 GCT_handle_kx (struct CadetTunnel *t,
3008 const struct GNUNET_MessageHeader *message)
3012 type = ntohs (message->type);
3013 LOG (GNUNET_ERROR_TYPE_DEBUG, "kx message received: %s\n", GC_m2s (type));
3016 case GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL:
3017 handle_ephemeral (t, (const struct GNUNET_CADET_KX_Ephemeral *) message);
3020 case GNUNET_MESSAGE_TYPE_CADET_KX_PONG:
3021 handle_pong (t, (const struct GNUNET_CADET_KX_Pong *) message);
3024 case GNUNET_MESSAGE_TYPE_CADET_AX_KX:
3025 handle_kx_ax (t, (const struct GNUNET_CADET_AX_KX *) message);
3029 GNUNET_break_op (0);
3030 LOG (GNUNET_ERROR_TYPE_WARNING, "kx message %s unknown\n", GC_m2s (type));
3035 * Initialize the tunnel subsystem.
3037 * @param c Configuration handle.
3038 * @param key ECC private key, to derive all other keys and do crypto.
3041 GCT_init (const struct GNUNET_CONFIGURATION_Handle *c,
3042 const struct GNUNET_CRYPTO_EddsaPrivateKey *key)
3044 int expected_overhead;
3046 LOG (GNUNET_ERROR_TYPE_DEBUG, "init\n");
3048 expected_overhead = 0;
3049 expected_overhead += sizeof (struct GNUNET_CADET_Encrypted);
3050 expected_overhead += sizeof (struct GNUNET_CADET_Data);
3051 expected_overhead += sizeof (struct GNUNET_CADET_ACK);
3052 GNUNET_assert (GNUNET_CONSTANTS_CADET_P2P_OVERHEAD == expected_overhead);
3055 GNUNET_CONFIGURATION_get_value_number (c, "CADET", "DEFAULT_TTL",
3058 GNUNET_log_config_invalid (GNUNET_ERROR_TYPE_WARNING,
3059 "CADET", "DEFAULT_TTL", "USING DEFAULT");
3063 GNUNET_CONFIGURATION_get_value_time (c, "CADET", "REKEY_PERIOD",
3066 rekey_period = GNUNET_TIME_UNIT_DAYS;
3071 otr_kx_msg.header.size = htons (sizeof (otr_kx_msg));
3072 otr_kx_msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_KX_EPHEMERAL);
3073 otr_kx_msg.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CADET_KX);
3074 otr_kx_msg.purpose.size = htonl (ephemeral_purpose_size ());
3075 otr_kx_msg.origin_identity = my_full_id;
3076 rekey_task = GNUNET_SCHEDULER_add_now (&global_otr_rekey, NULL);
3078 ax_key = GNUNET_CRYPTO_ecdhe_key_create ();
3079 GNUNET_CRYPTO_ecdhe_key_get_public (ax_key, &ax_identity.permanent_key);
3080 ax_identity.purpose.purpose = htonl (GNUNET_SIGNATURE_PURPOSE_CADET_AXKX);
3081 ax_identity.purpose.size = htonl (ax_purpose_size ());
3082 GNUNET_assert (GNUNET_OK ==
3083 GNUNET_CRYPTO_eddsa_sign (id_key,
3084 &ax_identity.purpose,
3085 &ax_identity.signature));
3087 tunnels = GNUNET_CONTAINER_multipeermap_create (128, GNUNET_YES);
3092 * Shut down the tunnel subsystem.
3097 if (NULL != rekey_task)
3099 GNUNET_SCHEDULER_cancel (rekey_task);
3102 GNUNET_CONTAINER_multipeermap_iterate (tunnels, &destroy_iterator, NULL);
3103 GNUNET_CONTAINER_multipeermap_destroy (tunnels);
3104 GNUNET_free (ax_key);
3111 * @param destination Peer this tunnel is towards.
3113 struct CadetTunnel *
3114 GCT_new (struct CadetPeer *destination)
3116 struct CadetTunnel *t;
3118 t = GNUNET_new (struct CadetTunnel);
3120 t->peer = destination;
3123 GNUNET_CONTAINER_multipeermap_put (tunnels, GCP_get_id (destination), t,
3124 GNUNET_CONTAINER_MULTIHASHMAPOPTION_UNIQUE_FAST))
3130 t->ax = GNUNET_new (struct CadetTunnelAxolotl);
3132 t->ax->kx_0 = GNUNET_CRYPTO_ecdhe_key_create ();
3138 * Change the tunnel's connection state.
3140 * @param t Tunnel whose connection state to change.
3141 * @param cstate New connection state.
3144 GCT_change_cstate (struct CadetTunnel* t, enum CadetTunnelCState cstate)
3148 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s cstate %s => %s\n",
3149 GCP_2s (t->peer), cstate2s (t->cstate), cstate2s (cstate));
3150 if (myid != GCP_get_short_id (t->peer) &&
3151 CADET_TUNNEL_READY != t->cstate &&
3152 CADET_TUNNEL_READY == cstate)
3155 if (CADET_TUNNEL_KEY_OK == t->estate)
3157 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered send queued data\n");
3158 send_queued_data (t);
3160 else if (CADET_TUNNEL_KEY_UNINITIALIZED == t->estate)
3162 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered kx\n");
3167 LOG (GNUNET_ERROR_TYPE_DEBUG, "estate %s\n", estate2s (t->estate));
3172 if (CADET_TUNNEL_READY == cstate
3173 && CONNECTIONS_PER_TUNNEL <= GCT_count_connections (t))
3175 LOG (GNUNET_ERROR_TYPE_DEBUG, " cstate triggered stop dht\n");
3176 GCP_stop_search (t->peer);
3182 * Change the tunnel encryption state.
3184 * @param t Tunnel whose encryption state to change, or NULL.
3185 * @param state New encryption state.
3188 GCT_change_estate (struct CadetTunnel* t, enum CadetTunnelEState state)
3190 enum CadetTunnelEState old;
3197 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate was %s\n",
3198 GCP_2s (t->peer), estate2s (old));
3199 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s estate is now %s\n",
3200 GCP_2s (t->peer), estate2s (t->estate));
3202 /* Send queued data if enc state changes to OK */
3203 if (myid != GCP_get_short_id (t->peer) &&
3204 CADET_TUNNEL_KEY_OK != old && CADET_TUNNEL_KEY_OK == t->estate)
3206 send_queued_data (t);
3212 * @brief Check if tunnel has too many connections, and remove one if necessary.
3214 * Currently this means the newest connection, unless it is a direct one.
3215 * Implemented as a task to avoid freeing a connection that is in the middle
3216 * of being created/processed.
3218 * @param cls Closure (Tunnel to check).
3219 * @param tc Task context.
3222 trim_connections (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3224 struct CadetTunnel *t = cls;
3226 t->trim_connections_task = NULL;
3228 if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
3231 if (GCT_count_connections (t) > 2 * CONNECTIONS_PER_TUNNEL)
3233 struct CadetTConnection *iter;
3234 struct CadetTConnection *c;
3236 for (c = iter = t->connection_head; NULL != iter; iter = iter->next)
3238 if ((iter->created.abs_value_us > c->created.abs_value_us)
3239 && GNUNET_NO == GCC_is_direct (iter->c))
3246 LOG (GNUNET_ERROR_TYPE_DEBUG, "Too many connections on tunnel %s\n",
3248 LOG (GNUNET_ERROR_TYPE_DEBUG, "Destroying connection %s\n",
3261 * Add a connection to a tunnel.
3264 * @param c Connection.
3267 GCT_add_connection (struct CadetTunnel *t, struct CadetConnection *c)
3269 struct CadetTConnection *aux;
3271 GNUNET_assert (NULL != c);
3273 LOG (GNUNET_ERROR_TYPE_DEBUG, "add connection %s\n", GCC_2s (c));
3274 LOG (GNUNET_ERROR_TYPE_DEBUG, " to tunnel %s\n", GCT_2s (t));
3275 for (aux = t->connection_head; aux != NULL; aux = aux->next)
3279 aux = GNUNET_new (struct CadetTConnection);
3281 aux->created = GNUNET_TIME_absolute_get ();
3283 GNUNET_CONTAINER_DLL_insert (t->connection_head, t->connection_tail, aux);
3285 if (CADET_TUNNEL_SEARCHING == t->cstate)
3286 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
3288 if (NULL != t->trim_connections_task)
3289 t->trim_connections_task = GNUNET_SCHEDULER_add_now (&trim_connections, t);
3294 * Remove a connection from a tunnel.
3297 * @param c Connection.
3300 GCT_remove_connection (struct CadetTunnel *t,
3301 struct CadetConnection *c)
3303 struct CadetTConnection *aux;
3304 struct CadetTConnection *next;
3307 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing connection %s from tunnel %s\n",
3308 GCC_2s (c), GCT_2s (t));
3309 for (aux = t->connection_head; aux != NULL; aux = next)
3314 GNUNET_CONTAINER_DLL_remove (t->connection_head, t->connection_tail, aux);
3319 conns = GCT_count_connections (t);
3321 && NULL == t->destroy_task
3322 && CADET_TUNNEL_SHUTDOWN != t->cstate
3323 && GNUNET_NO == shutting_down)
3325 if (0 == GCT_count_any_connections (t))
3326 GCT_change_cstate (t, CADET_TUNNEL_SEARCHING);
3328 GCT_change_cstate (t, CADET_TUNNEL_WAITING);
3331 /* Start new connections if needed */
3332 if (CONNECTIONS_PER_TUNNEL > conns
3333 && NULL == t->destroy_task
3334 && CADET_TUNNEL_SHUTDOWN != t->cstate
3335 && GNUNET_NO == shutting_down)
3337 LOG (GNUNET_ERROR_TYPE_DEBUG, " too few connections, getting new ones\n");
3338 GCP_connect (t->peer); /* Will change cstate to WAITING when possible */
3342 /* If not marked as ready, no change is needed */
3343 if (CADET_TUNNEL_READY != t->cstate)
3346 /* Check if any connection is ready to maintain cstate */
3347 for (aux = t->connection_head; aux != NULL; aux = aux->next)
3348 if (CADET_CONNECTION_READY == GCC_get_state (aux->c))
3354 * Add a channel to a tunnel.
3357 * @param ch Channel.
3360 GCT_add_channel (struct CadetTunnel *t, struct CadetChannel *ch)
3362 struct CadetTChannel *aux;
3364 GNUNET_assert (NULL != ch);
3366 LOG (GNUNET_ERROR_TYPE_DEBUG, "Adding channel %p to tunnel %p\n", ch, t);
3368 for (aux = t->channel_head; aux != NULL; aux = aux->next)
3370 LOG (GNUNET_ERROR_TYPE_DEBUG, " already there %p\n", aux->ch);
3375 aux = GNUNET_new (struct CadetTChannel);
3377 LOG (GNUNET_ERROR_TYPE_DEBUG, " adding %p to %p\n", aux, t->channel_head);
3378 GNUNET_CONTAINER_DLL_insert_tail (t->channel_head, t->channel_tail, aux);
3380 if (NULL != t->destroy_task)
3382 GNUNET_SCHEDULER_cancel (t->destroy_task);
3383 t->destroy_task = NULL;
3384 LOG (GNUNET_ERROR_TYPE_DEBUG, " undo destroy!\n");
3390 * Remove a channel from a tunnel.
3393 * @param ch Channel.
3396 GCT_remove_channel (struct CadetTunnel *t, struct CadetChannel *ch)
3398 struct CadetTChannel *aux;
3400 LOG (GNUNET_ERROR_TYPE_DEBUG, "Removing channel %p from tunnel %p\n", ch, t);
3401 for (aux = t->channel_head; aux != NULL; aux = aux->next)
3405 LOG (GNUNET_ERROR_TYPE_DEBUG, " found! %s\n", GCCH_2s (ch));
3406 GNUNET_CONTAINER_DLL_remove (t->channel_head, t->channel_tail, aux);
3415 * Search for a channel by global ID.
3417 * @param t Tunnel containing the channel.
3418 * @param chid Public channel number.
3420 * @return channel handler, NULL if doesn't exist
3422 struct CadetChannel *
3423 GCT_get_channel (struct CadetTunnel *t, CADET_ChannelNumber chid)
3425 struct CadetTChannel *iter;
3430 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3432 if (GCCH_get_id (iter->ch) == chid)
3436 return NULL == iter ? NULL : iter->ch;
3441 * @brief Destroy a tunnel and free all resources.
3443 * Should only be called a while after the tunnel has been marked as destroyed,
3444 * in case there is a new channel added to the same peer shortly after marking
3445 * the tunnel. This way we avoid a new public key handshake.
3447 * @param cls Closure (tunnel to destroy).
3448 * @param tc Task context.
3451 delayed_destroy (void *cls, const struct GNUNET_SCHEDULER_TaskContext *tc)
3453 struct CadetTunnel *t = cls;
3454 struct CadetTConnection *iter;
3456 LOG (GNUNET_ERROR_TYPE_DEBUG, "delayed destroying tunnel %p\n", t);
3457 if (0 != (GNUNET_SCHEDULER_REASON_SHUTDOWN & tc->reason))
3459 LOG (GNUNET_ERROR_TYPE_WARNING,
3460 "Not destroying tunnel, due to shutdown. "
3461 "Tunnel at %p should have been freed by GCT_shutdown\n", t);
3464 t->destroy_task = NULL;
3465 t->cstate = CADET_TUNNEL_SHUTDOWN;
3467 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3469 GCC_send_destroy (iter->c);
3476 * Tunnel is empty: destroy it.
3478 * Notifies all connections about the destruction.
3480 * @param t Tunnel to destroy.
3483 GCT_destroy_empty (struct CadetTunnel *t)
3485 if (GNUNET_YES == shutting_down)
3486 return; /* Will be destroyed immediately anyway */
3488 if (NULL != t->destroy_task)
3490 LOG (GNUNET_ERROR_TYPE_WARNING,
3491 "Tunnel %s is already scheduled for destruction. Tunnel debug dump:\n",
3493 GCT_debug (t, GNUNET_ERROR_TYPE_WARNING);
3495 /* should never happen, tunnel can only become empty once, and the
3496 * task identifier should be NO_TASK (cleaned when the tunnel was created
3497 * or became un-empty)
3502 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s empty: scheduling destruction\n",
3505 // FIXME make delay a config option
3506 t->destroy_task = GNUNET_SCHEDULER_add_delayed (GNUNET_TIME_UNIT_MINUTES,
3507 &delayed_destroy, t);
3508 LOG (GNUNET_ERROR_TYPE_DEBUG, "Scheduled destroy of %p as %llu\n",
3509 t, t->destroy_task);
3514 * Destroy tunnel if empty (no more channels).
3516 * @param t Tunnel to destroy if empty.
3519 GCT_destroy_if_empty (struct CadetTunnel *t)
3521 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel %s destroy if empty\n", GCT_2s (t));
3522 if (0 < GCT_count_channels (t))
3525 GCT_destroy_empty (t);
3530 * Destroy the tunnel.
3532 * This function does not generate any warning traffic to clients or peers.
3535 * Cancel messages belonging to this tunnel queued to neighbors.
3536 * Free any allocated resources linked to the tunnel.
3538 * @param t The tunnel to destroy.
3541 GCT_destroy (struct CadetTunnel *t)
3543 struct CadetTConnection *iter_c;
3544 struct CadetTConnection *next_c;
3545 struct CadetTChannel *iter_ch;
3546 struct CadetTChannel *next_ch;
3551 LOG (GNUNET_ERROR_TYPE_DEBUG, "destroying tunnel %s\n", GCP_2s (t->peer));
3553 GNUNET_break (GNUNET_YES ==
3554 GNUNET_CONTAINER_multipeermap_remove (tunnels,
3555 GCP_get_id (t->peer), t));
3557 for (iter_c = t->connection_head; NULL != iter_c; iter_c = next_c)
3559 next_c = iter_c->next;
3560 GCC_destroy (iter_c->c);
3562 for (iter_ch = t->channel_head; NULL != iter_ch; iter_ch = next_ch)
3564 next_ch = iter_ch->next;
3565 GCCH_destroy (iter_ch->ch);
3566 /* Should only happen on shutdown, but it's ok. */
3569 if (NULL != t->destroy_task)
3571 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling dest: %llX\n", t->destroy_task);
3572 GNUNET_SCHEDULER_cancel (t->destroy_task);
3573 t->destroy_task = NULL;
3576 if (NULL != t->trim_connections_task)
3578 LOG (GNUNET_ERROR_TYPE_DEBUG, "cancelling trim: %llX\n",
3579 t->trim_connections_task);
3580 GNUNET_SCHEDULER_cancel (t->trim_connections_task);
3581 t->trim_connections_task = NULL;
3584 GNUNET_STATISTICS_update (stats, "# tunnels", -1, GNUNET_NO);
3585 GCP_set_tunnel (t->peer, NULL);
3587 if (NULL != t->rekey_task)
3589 GNUNET_SCHEDULER_cancel (t->rekey_task);
3590 t->rekey_task = NULL;
3592 if (NULL != t->kx_ctx)
3594 if (NULL != t->kx_ctx->finish_task)
3595 GNUNET_SCHEDULER_cancel (t->kx_ctx->finish_task);
3596 GNUNET_free (t->kx_ctx);
3607 * @brief Use the given path for the tunnel.
3608 * Update the next and prev hops (and RCs).
3609 * (Re)start the path refresh in case the tunnel is locally owned.
3611 * @param t Tunnel to update.
3612 * @param p Path to use.
3614 * @return Connection created.
3616 struct CadetConnection *
3617 GCT_use_path (struct CadetTunnel *t, struct CadetPeerPath *p)
3619 struct CadetConnection *c;
3620 struct GNUNET_CADET_Hash cid;
3621 unsigned int own_pos;
3623 if (NULL == t || NULL == p)
3629 if (CADET_TUNNEL_SHUTDOWN == t->cstate)
3635 for (own_pos = 0; own_pos < p->length; own_pos++)
3637 if (p->peers[own_pos] == myid)
3640 if (own_pos >= p->length)
3642 GNUNET_break_op (0);
3646 GNUNET_CRYPTO_random_block (GNUNET_CRYPTO_QUALITY_NONCE, &cid, sizeof (cid));
3647 c = GCC_new (&cid, t, p, own_pos);
3650 /* Path was flawed */
3653 GCT_add_connection (t, c);
3659 * Count all created connections of a tunnel. Not necessarily ready connections!
3661 * @param t Tunnel on which to count.
3663 * @return Number of connections created, either being established or ready.
3666 GCT_count_any_connections (struct CadetTunnel *t)
3668 struct CadetTConnection *iter;
3674 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3682 * Count established (ready) connections of a tunnel.
3684 * @param t Tunnel on which to count.
3686 * @return Number of connections.
3689 GCT_count_connections (struct CadetTunnel *t)
3691 struct CadetTConnection *iter;
3697 for (count = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3698 if (CADET_CONNECTION_READY == GCC_get_state (iter->c))
3706 * Count channels of a tunnel.
3708 * @param t Tunnel on which to count.
3710 * @return Number of channels.
3713 GCT_count_channels (struct CadetTunnel *t)
3715 struct CadetTChannel *iter;
3718 for (count = 0, iter = t->channel_head;
3720 iter = iter->next, count++) /* skip */;
3727 * Get the connectivity state of a tunnel.
3731 * @return Tunnel's connectivity state.
3733 enum CadetTunnelCState
3734 GCT_get_cstate (struct CadetTunnel *t)
3739 return (enum CadetTunnelCState) -1;
3746 * Get the encryption state of a tunnel.
3750 * @return Tunnel's encryption state.
3752 enum CadetTunnelEState
3753 GCT_get_estate (struct CadetTunnel *t)
3758 return (enum CadetTunnelEState) -1;
3764 * Get the maximum buffer space for a tunnel towards a local client.
3768 * @return Biggest buffer space offered by any channel in the tunnel.
3771 GCT_get_channels_buffer (struct CadetTunnel *t)
3773 struct CadetTChannel *iter;
3774 unsigned int buffer;
3775 unsigned int ch_buf;
3777 if (NULL == t->channel_head)
3779 /* Probably getting buffer for a channel create/handshake. */
3780 LOG (GNUNET_ERROR_TYPE_DEBUG, " no channels, allow max\n");
3785 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3787 ch_buf = get_channel_buffer (iter);
3788 if (ch_buf > buffer)
3796 * Get the total buffer space for a tunnel for P2P traffic.
3800 * @return Buffer space offered by all connections in the tunnel.
3803 GCT_get_connections_buffer (struct CadetTunnel *t)
3805 struct CadetTConnection *iter;
3806 unsigned int buffer;
3808 if (GNUNET_NO == is_ready (t))
3810 if (count_queued_data (t) > 3)
3817 for (iter = t->connection_head; NULL != iter; iter = iter->next)
3819 if (GCC_get_state (iter->c) != CADET_CONNECTION_READY)
3823 buffer += get_connection_buffer (iter);
3831 * Get the tunnel's destination.
3835 * @return ID of the destination peer.
3837 const struct GNUNET_PeerIdentity *
3838 GCT_get_destination (struct CadetTunnel *t)
3840 return GCP_get_id (t->peer);
3845 * Get the tunnel's next free global channel ID.
3849 * @return GID of a channel free to use.
3852 GCT_get_next_chid (struct CadetTunnel *t)
3854 CADET_ChannelNumber chid;
3855 CADET_ChannelNumber mask;
3858 /* Set bit 30 depending on the ID relationship. Bit 31 is always 0 for GID.
3859 * If our ID is bigger or loopback tunnel, start at 0, bit 30 = 0
3860 * If peer's ID is bigger, start at 0x4... bit 30 = 1
3862 result = GNUNET_CRYPTO_cmp_peer_identity (&my_full_id, GCP_get_id (t->peer));
3867 t->next_chid |= mask;
3869 while (NULL != GCT_get_channel (t, t->next_chid))
3871 LOG (GNUNET_ERROR_TYPE_DEBUG, "Channel %u exists...\n", t->next_chid);
3872 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3873 t->next_chid |= mask;
3875 chid = t->next_chid;
3876 t->next_chid = (t->next_chid + 1) & ~GNUNET_CADET_LOCAL_CHANNEL_ID_CLI;
3877 t->next_chid |= mask;
3884 * Send ACK on one or more channels due to buffer in connections.
3886 * @param t Channel which has some free buffer space.
3889 GCT_unchoke_channels (struct CadetTunnel *t)
3891 struct CadetTChannel *iter;
3892 unsigned int buffer;
3893 unsigned int channels = GCT_count_channels (t);
3894 unsigned int choked_n;
3895 struct CadetChannel *choked[channels];
3897 LOG (GNUNET_ERROR_TYPE_DEBUG, "GCT_unchoke_channels on %s\n", GCT_2s (t));
3898 LOG (GNUNET_ERROR_TYPE_DEBUG, " head: %p\n", t->channel_head);
3899 if (NULL != t->channel_head)
3900 LOG (GNUNET_ERROR_TYPE_DEBUG, " head ch: %p\n", t->channel_head->ch);
3902 /* Get buffer space */
3903 buffer = GCT_get_connections_buffer (t);
3909 /* Count and remember choked channels */
3911 for (iter = t->channel_head; NULL != iter; iter = iter->next)
3913 if (GNUNET_NO == get_channel_allowed (iter))
3915 choked[choked_n++] = iter->ch;
3919 /* Unchoke random channels */
3920 while (0 < buffer && 0 < choked_n)
3922 unsigned int r = GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
3924 GCCH_allow_client (choked[r], GCCH_is_origin (choked[r], GNUNET_YES));
3927 choked[r] = choked[choked_n];
3933 * Send ACK on one or more connections due to buffer space to the client.
3935 * Iterates all connections of the tunnel and sends ACKs appropriately.
3940 GCT_send_connection_acks (struct CadetTunnel *t)
3942 struct CadetTConnection *iter;
3945 uint32_t allow_per_connection;
3947 unsigned int buffer;
3949 LOG (GNUNET_ERROR_TYPE_DEBUG, "Tunnel send connection ACKs on %s\n",
3958 if (CADET_TUNNEL_READY != t->cstate)
3961 buffer = GCT_get_channels_buffer (t);
3962 LOG (GNUNET_ERROR_TYPE_DEBUG, " buffer %u\n", buffer);
3964 /* Count connections, how many messages are already allowed */
3965 cs = GCT_count_connections (t);
3966 for (allowed = 0, iter = t->connection_head; NULL != iter; iter = iter->next)
3968 allowed += get_connection_allowed (iter);
3970 LOG (GNUNET_ERROR_TYPE_DEBUG, " allowed %u\n", allowed);
3972 /* Make sure there is no overflow */
3973 if (allowed > buffer)
3976 /* Authorize connections to send more data */
3977 to_allow = buffer - allowed;
3979 for (iter = t->connection_head;
3980 NULL != iter && to_allow > 0;
3983 if (CADET_CONNECTION_READY != GCC_get_state (iter->c)
3984 || get_connection_allowed (iter) > 64 / 3)
3988 allow_per_connection = to_allow/cs;
3989 to_allow -= allow_per_connection;
3991 GCC_allow (iter->c, allow_per_connection,
3992 GCC_is_origin (iter->c, GNUNET_NO));
3997 /* Since we don't allow if it's allowed to send 64/3, this can happen. */
3998 LOG (GNUNET_ERROR_TYPE_DEBUG, " reminding to_allow: %u\n", to_allow);
4004 * Cancel a previously sent message while it's in the queue.
4006 * ONLY can be called before the continuation given to the send function
4007 * is called. Once the continuation is called, the message is no longer in the
4010 * @param q Handle to the queue.
4013 GCT_cancel (struct CadetTunnelQueue *q)
4018 /* tun_message_sent() will be called and free q */
4020 else if (NULL != q->tqd)
4022 unqueue_data (q->tqd);
4024 if (NULL != q->cont)
4025 q->cont (q->cont_cls, NULL, q, 0, 0);
4036 * Sends an already built message on a tunnel, encrypting it and
4037 * choosing the best connection if not provided.
4039 * @param message Message to send. Function modifies it.
4040 * @param t Tunnel on which this message is transmitted.
4041 * @param c Connection to use (autoselect if NULL).
4042 * @param force Force the tunnel to take the message (buffer overfill).
4043 * @param cont Continuation to call once message is really sent.
4044 * @param cont_cls Closure for @c cont.
4046 * @return Handle to cancel message. NULL if @c cont is NULL.
4048 struct CadetTunnelQueue *
4049 GCT_send_prebuilt_message (const struct GNUNET_MessageHeader *message,
4050 struct CadetTunnel *t, struct CadetConnection *c,
4051 int force, GCT_sent cont, void *cont_cls)
4053 return send_prebuilt_message (message, t, c, force, cont, cont_cls, NULL);
4058 * Send an Axolotl KX message.
4060 * @param t Tunnel on which to send it.
4063 GCT_send_ax_kx (struct CadetTunnel *t)
4065 struct GNUNET_CADET_AX_KX msg;
4067 LOG (GNUNET_ERROR_TYPE_INFO, "===> AX_KX for %s\n", GCT_2s (t));
4069 msg.header.size = htons (sizeof (msg));
4070 msg.header.type = htons (GNUNET_MESSAGE_TYPE_CADET_AX_KX);
4071 msg.permanent_key = ax_identity.permanent_key;
4072 msg.purpose = ax_identity.purpose;
4073 msg.signature = ax_identity.signature;
4074 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->kx_0, &msg.ephemeral_key);
4075 GNUNET_CRYPTO_ecdhe_key_get_public (t->ax->DHRs, &msg.ratchet_key);
4077 t->ephm_h = send_kx (t, &msg.header);
4078 GCT_change_estate (t, CADET_TUNNEL_KEY_SENT);
4083 * Sends an already built and encrypted message on a tunnel, choosing the best
4084 * connection. Useful for re-queueing messages queued on a destroyed connection.
4086 * @param message Message to send. Function modifies it.
4087 * @param t Tunnel on which this message is transmitted.
4090 GCT_resend_message (const struct GNUNET_MessageHeader *message,
4091 struct CadetTunnel *t)
4093 struct CadetConnection *c;
4096 c = tunnel_get_connection (t);
4099 /* TODO queue in tunnel, marked as encrypted */
4100 LOG (GNUNET_ERROR_TYPE_DEBUG, "No connection available, dropping.\n");
4103 fwd = GCC_is_origin (c, GNUNET_YES);
4104 GNUNET_break (NULL == GCC_send_prebuilt_message (message, 0, 0, c, fwd,
4105 GNUNET_YES, NULL, NULL));
4110 * Is the tunnel directed towards the local peer?
4114 * @return #GNUNET_YES if it is loopback.
4117 GCT_is_loopback (const struct CadetTunnel *t)
4119 return (myid == GCP_get_short_id (t->peer));
4124 * Is the tunnel this path already?
4129 * @return #GNUNET_YES a connection uses this path.
4132 GCT_is_path_used (const struct CadetTunnel *t, const struct CadetPeerPath *p)
4134 struct CadetTConnection *iter;
4136 for (iter = t->connection_head; NULL != iter; iter = iter->next)
4137 if (path_equivalent (GCC_get_path (iter->c), p))
4145 * Get a cost of a path for a tunnel considering existing connections.
4148 * @param path Candidate path.
4150 * @return Cost of the path (path length + number of overlapping nodes)
4153 GCT_get_path_cost (const struct CadetTunnel *t,
4154 const struct CadetPeerPath *path)
4156 struct CadetTConnection *iter;
4157 const struct CadetPeerPath *aux;
4158 unsigned int overlap;
4166 GNUNET_assert (NULL != t);
4168 for (i = 0; i < path->length; i++)
4170 for (iter = t->connection_head; NULL != iter; iter = iter->next)
4172 aux = GCC_get_path (iter->c);
4176 for (j = 0; j < aux->length; j++)
4178 if (path->peers[i] == aux->peers[j])
4186 return path->length + overlap;
4191 * Get the static string for the peer this tunnel is directed.
4195 * @return Static string the destination peer's ID.
4198 GCT_2s (const struct CadetTunnel *t)
4203 return GCP_2s (t->peer);
4207 /******************************************************************************/
4208 /***************************** INFO/DEBUG *******************************/
4209 /******************************************************************************/
4212 ax_debug (const struct CadetTunnelAxolotl *ax, enum GNUNET_ErrorType level)
4214 struct GNUNET_CRYPTO_EcdhePublicKey pub;
4215 struct CadetTunnelSkippedKey *iter;
4218 LOG2 (level, "TTT RK\t %s\n",
4219 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->RK));
4221 LOG2 (level, "TTT HKs\t %s\n",
4222 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->HKs));
4223 LOG2 (level, "TTT HKr\t %s\n",
4224 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->HKr));
4225 LOG2 (level, "TTT NHKs\t %s\n",
4226 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->NHKs));
4227 LOG2 (level, "TTT NHKr\t %s\n",
4228 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->NHKr));
4230 LOG2 (level, "TTT CKs\t %s\n",
4231 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->CKs));
4232 LOG2 (level, "TTT CKr\t %s\n",
4233 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->CKr));
4235 GNUNET_CRYPTO_ecdhe_key_get_public (ax_key, &pub);
4236 LOG2 (level, "TTT DHIs\t %s\n",
4237 GNUNET_h2s ((struct GNUNET_HashCode *) &pub));
4238 LOG2 (level, "TTT DHIr\t %s\n",
4239 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->DHIr));
4240 GNUNET_CRYPTO_ecdhe_key_get_public (ax->DHRs, &pub);
4241 LOG2 (level, "TTT DHRs\t %s\n",
4242 GNUNET_h2s ((struct GNUNET_HashCode *) &pub));
4243 LOG2 (level, "TTT DHRr\t %s\n",
4244 GNUNET_h2s ((struct GNUNET_HashCode *) &ax->DHRr));
4246 LOG2 (level, "TTT Nr\t %u\tNs\t%u\n", ax->Nr, ax->Ns);
4247 LOG2 (level, "TTT PNs\t %u\tSkipped\t%u\n", ax->PNs, ax->skipped);
4248 LOG2 (level, "TTT Ratchet\t%u\n", ax->ratchet_flag);
4250 for (iter = ax->skipped_head; NULL != iter; iter = iter->next)
4252 LOG2 (level, "TTT HK\t %s\n",
4253 GNUNET_h2s ((struct GNUNET_HashCode *) &iter->HK));
4254 LOG2 (level, "TTT MK\t %s\n",
4255 GNUNET_h2s ((struct GNUNET_HashCode *) &iter->MK));
4260 * Log all possible info about the tunnel state.
4262 * @param t Tunnel to debug.
4263 * @param level Debug level to use.
4266 GCT_debug (const struct CadetTunnel *t, enum GNUNET_ErrorType level)
4268 struct CadetTChannel *iterch;
4269 struct CadetTConnection *iterc;
4272 do_log = GNUNET_get_log_call_status (level & (~GNUNET_ERROR_TYPE_BULK),
4274 __FILE__, __FUNCTION__, __LINE__);
4278 LOG2 (level, "TTT DEBUG TUNNEL TOWARDS %s\n", GCT_2s (t));
4279 LOG2 (level, "TTT cstate %s, estate %s\n",
4280 cstate2s (t->cstate), estate2s (t->estate));
4281 LOG2 (level, "TTT kx_ctx %p, rekey_task %u, finish task %u\n",
4282 t->kx_ctx, t->rekey_task, t->kx_ctx ? t->kx_ctx->finish_task : 0);
4283 #if DUMP_KEYS_TO_STDERR
4284 if (CADET_Axolotl == t->enc_type)
4286 ax_debug (t->ax, level);
4290 LOG2 (level, "TTT my EPHM\t %s\n",
4291 GNUNET_h2s ((struct GNUNET_HashCode *) &otr_kx_msg.ephemeral_key));
4292 LOG2 (level, "TTT peers EPHM:\t %s\n",
4293 GNUNET_h2s ((struct GNUNET_HashCode *) &t->peers_ephemeral_key));
4294 LOG2 (level, "TTT ENC key:\t %s\n",
4295 GNUNET_h2s ((struct GNUNET_HashCode *) &t->e_key));
4296 LOG2 (level, "TTT DEC key:\t %s\n",
4297 GNUNET_h2s ((struct GNUNET_HashCode *) &t->d_key));
4300 LOG2 (level, "TTT OLD ENC key:\t %s\n",
4301 GNUNET_h2s ((struct GNUNET_HashCode *) &t->kx_ctx->e_key_old));
4302 LOG2 (level, "TTT OLD DEC key:\t %s\n",
4303 GNUNET_h2s ((struct GNUNET_HashCode *) &t->kx_ctx->d_key_old));
4307 LOG2 (level, "TTT tq_head %p, tq_tail %p\n", t->tq_head, t->tq_tail);
4308 LOG2 (level, "TTT destroy %u\n", t->destroy_task);
4310 LOG2 (level, "TTT channels:\n");
4311 for (iterch = t->channel_head; NULL != iterch; iterch = iterch->next)
4313 LOG2 (level, "TTT - %s\n", GCCH_2s (iterch->ch));
4316 LOG2 (level, "TTT connections:\n");
4317 for (iterc = t->connection_head; NULL != iterc; iterc = iterc->next)
4319 GCC_debug (iterc->c, level);
4322 LOG2 (level, "TTT DEBUG TUNNEL END\n");
4327 * Iterate all tunnels.
4329 * @param iter Iterator.
4330 * @param cls Closure for @c iter.
4333 GCT_iterate_all (GNUNET_CONTAINER_PeerMapIterator iter, void *cls)
4335 GNUNET_CONTAINER_multipeermap_iterate (tunnels, iter, cls);
4340 * Count all tunnels.
4342 * @return Number of tunnels to remote peers kept by this peer.
4345 GCT_count_all (void)
4347 return GNUNET_CONTAINER_multipeermap_size (tunnels);
4352 * Iterate all connections of a tunnel.
4354 * @param t Tunnel whose connections to iterate.
4355 * @param iter Iterator.
4356 * @param cls Closure for @c iter.
4359 GCT_iterate_connections (struct CadetTunnel *t, GCT_conn_iter iter, void *cls)
4361 struct CadetTConnection *ct;
4363 for (ct = t->connection_head; NULL != ct; ct = ct->next)
4369 * Iterate all channels of a tunnel.
4371 * @param t Tunnel whose channels to iterate.
4372 * @param iter Iterator.
4373 * @param cls Closure for @c iter.
4376 GCT_iterate_channels (struct CadetTunnel *t, GCT_chan_iter iter, void *cls)
4378 struct CadetTChannel *cht;
4380 for (cht = t->channel_head; NULL != cht; cht = cht->next)
4381 iter (cls, cht->ch);