3 * Main header file for TrIPE
5 * (c) 2001 Straylight/Edgeware
8 /*----- Licensing notice --------------------------------------------------*
10 * This file is part of Trivial IP Encryption (TrIPE).
12 * TrIPE is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * TrIPE is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with TrIPE; if not, write to the Free Software Foundation,
24 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
34 /*----- Header files ------------------------------------------------------*/
50 #include <sys/types.h>
57 #include <sys/socket.h>
59 #include <netinet/in.h>
60 #include <arpa/inet.h>
66 #include <mLib/alloc.h>
67 #include <mLib/arena.h>
68 #include <mLib/base64.h>
69 #include <mLib/bres.h>
70 #include <mLib/daemonize.h>
71 #include <mLib/dstr.h>
73 #include <mLib/fdflags.h>
74 #include <mLib/fdpass.h>
75 #include <mLib/fwatch.h>
76 #include <mLib/hash.h>
77 #include <mLib/macros.h>
78 #include <mLib/mdup.h>
79 #include <mLib/mdwopt.h>
80 #include <mLib/quis.h>
81 #include <mLib/report.h>
83 #include <mLib/selbuf.h>
87 #include <mLib/trace.h>
89 #include <mLib/versioncmp.h>
91 #include <catacomb/buf.h>
93 #include <catacomb/gcipher.h>
94 #include <catacomb/gmac.h>
95 #include <catacomb/grand.h>
96 #include <catacomb/key.h>
97 #include <catacomb/paranoia.h>
99 #include <catacomb/noise.h>
100 #include <catacomb/rand.h>
102 #include <catacomb/mp.h>
103 #include <catacomb/mprand.h>
104 #include <catacomb/dh.h>
105 #include <catacomb/ec.h>
106 #include <catacomb/ec-keys.h>
107 #include <catacomb/group.h>
110 #include "protocol.h"
116 /*----- Magic numbers -----------------------------------------------------*/
118 /* --- Trace flags --- */
126 #define T_KEYEXCH 64u
127 #define T_KEYMGMT 128u
129 /* T_PRIVSEP in priv.h */
135 #define SEC(n) (n##u)
136 #define MIN(n) (n##u * 60u)
137 #define MEG(n) (n##ul * 1024ul * 1024ul)
139 /* --- Other things --- */
141 #define PKBUFSZ 65536
143 /*----- Cipher selections -------------------------------------------------*/
145 typedef struct algswitch
{
146 const gccipher
*c
; /* Symmetric encryption scheme */
147 const gccipher
*mgf
; /* Mask-generation function */
148 const gchash
*h
; /* Hash function */
149 const gcmac
*m
; /* Message authentication code */
150 size_t hashsz
; /* Hash output size */
151 size_t tagsz
; /* Length to truncate MAC tags */
152 size_t expsz
; /* Size of data to process */
153 size_t cksz
, mksz
; /* Key lengths for @c@ and @m@ */
156 typedef struct kdata
{
157 unsigned ref
; /* Reference counter */
158 struct knode
*kn
; /* Pointer to cache entry */
159 char *tag
; /* Full tag name of the key */
160 group
*g
; /* The group we work in */
161 size_t indexsz
; /* Size of exponent for the group */
162 mp
*kpriv
; /* The private key (or null) */
163 ge
*kpub
; /* The public key */
164 time_t t_exp
; /* Expiry time of the key */
165 algswitch algs
; /* Collection of algorithms */
168 typedef struct knode
{
169 sym_base _b
; /* Symbol table intrusion */
170 unsigned f
; /* Various flags */
171 #define KNF_BROKEN 1u /* Don't use this key any more */
172 struct keyhalf
*kh
; /* Pointer to the home keyhalf */
173 kdata
*kd
; /* Pointer to the key data */
176 #define MAXHASHSZ 64 /* Largest possible hash size */
178 #define HASH_STRING(h, s) GH_HASH((h), (s), sizeof(s))
180 /*----- Data structures ---------------------------------------------------*/
182 /* --- Socket addresses --- *
184 * A magic union of supported socket addresses.
189 struct sockaddr_in sin
;
192 /* --- Mapping keyed on addresses --- */
194 typedef struct addrmap
{
199 typedef struct addrmap_base
{
204 /* --- Sequence number checking --- */
206 typedef struct seqwin
{
207 uint32 seq
; /* First acceptable input sequence */
208 uint32 win
; /* Window of acceptable numbers */
211 #define SEQ_WINSZ 32 /* Bits in sequence number window */
213 /* --- A symmetric keyset --- *
215 * A keyset contains a set of symmetric keys for encrypting and decrypting
216 * packets. Keysets are stored in a list, sorted in reverse order of
217 * creation, so that the most recent keyset (the one most likely to be used)
220 * Each keyset has a time limit and a data limit. The keyset is destroyed
221 * when either it has existed for too long, or it has been used to encrypt
222 * too much data. New key exchanges are triggered when keys are close to
226 typedef struct keyset
{
227 struct keyset
*next
; /* Next active keyset in the list */
228 unsigned ref
; /* Reference count for keyset */
229 struct peer
*p
; /* Pointer to peer structure */
230 time_t t_exp
; /* Expiry time for this keyset */
231 unsigned long sz_exp
, sz_regen
; /* Data limits for the keyset */
232 T( unsigned seq
; ) /* Sequence number for tracing */
233 unsigned f
; /* Various useful flags */
234 gcipher
*cin
, *cout
; /* Keyset ciphers for encryption */
235 size_t tagsz
; /* Length to truncate MAC tags */
236 gmac
*min
, *mout
; /* Keyset MACs for integrity */
237 uint32 oseq
; /* Outbound sequence number */
238 seqwin iseq
; /* Inbound sequence number */
241 #define KSF_LISTEN 1u /* Don't encrypt packets yet */
242 #define KSF_LINK 2u /* Key is in a linked list */
244 #define KSERR_REGEN -1 /* Regenerate keys */
245 #define KSERR_NOKEYS -2 /* No keys left */
246 #define KSERR_DECRYPT -3 /* Unable to decrypt message */
247 #define KSERR_SEQ -4 /* Incorrect sequence number */
248 #define KSERR_MALFORMED -5 /* Input ciphertext is broken */
250 /* --- Key exchange --- *
252 * TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers
253 * Protocol has a number of desirable features (e.g., perfect forward
254 * secrecy, and zero-knowledge authentication) which make it attractive for
255 * use in TrIPE. The Wrestlers Protocol was designed by Mark Wooding and
261 typedef struct kxchal
{
262 struct keyexch
*kx
; /* Pointer back to key exchange */
263 ge
*c
; /* Responder's challenge */
264 ge
*r
; /* My reply to the challenge */
265 keyset
*ks
; /* Pointer to temporary keyset */
266 unsigned f
; /* Various useful flags */
267 sel_timer t
; /* Response timer for challenge */
268 octet hc
[MAXHASHSZ
]; /* Hash of his challenge */
269 octet ck
[MAXHASHSZ
]; /* His magical check value */
270 octet hswrq_in
[MAXHASHSZ
]; /* Inbound switch request message */
271 octet hswok_in
[MAXHASHSZ
]; /* Inbound switch confirmation */
272 octet hswrq_out
[MAXHASHSZ
]; /* Outbound switch request message */
273 octet hswok_out
[MAXHASHSZ
]; /* Outbound switch confirmation */
276 typedef struct keyexch
{
277 struct peer
*p
; /* Pointer back to the peer */
278 kdata
*kpriv
; /* Private key and related info */
279 kdata
*kpub
; /* Peer's public key */
280 keyset
**ks
; /* Peer's list of keysets */
281 unsigned f
; /* Various useful flags */
282 unsigned s
; /* Current state in exchange */
283 sel_timer t
; /* Timer for next exchange */
284 mp
*alpha
; /* My temporary secret */
285 ge
*c
; /* My challenge */
286 ge
*rx
; /* The expected response */
287 unsigned nr
; /* Number of extant responses */
288 time_t t_valid
; /* When this exchange goes bad */
289 octet hc
[MAXHASHSZ
]; /* Hash of my challenge */
290 kxchal
*r
[KX_NCHAL
]; /* Array of challenges */
293 #define KXF_TIMER 1u /* Waiting for a timer to go off */
294 #define KXF_DEAD 2u /* The key-exchanger isn't up */
295 #define KXF_PUBKEY 4u /* Key exchanger has a public key */
296 #define KXF_CORK 8u /* Don't send anything yet */
299 KXS_DEAD
, /* Uninitialized state (magical) */
300 KXS_CHAL
, /* Main answer-challenges state */
301 KXS_COMMIT
, /* Committed: send switch request */
302 KXS_SWITCH
/* Switched: send confirmation */
305 /* --- Tunnel structure --- *
307 * Used to maintain system-specific information about the tunnel interface.
310 typedef struct tunnel tunnel
;
313 typedef struct tunnel_ops
{
314 const char *name
; /* Name of this tunnel driver */
315 unsigned flags
; /* Various interesting flags */
316 #define TUNF_PRIVOPEN 1u /* Need helper to open file */
317 void (*init
)(void); /* Initializes the system */
318 tunnel
*(*create
)(struct peer */
*p*/
, int /*fd*/, char **/
*ifn*/
);
319 /* Initializes a new tunnel */
320 void (*setifname
)(tunnel */
*t*/
, const char */
*ifn*/
);
321 /* Notifies ifname change */
322 void (*inject
)(tunnel */
*t*/
, buf */
*b*/
); /* Sends packet through if */
323 void (*destroy
)(tunnel */
*t*/
); /* Destroys a tunnel */
326 #ifndef TUN_INTERNALS
327 struct tunnel
{ const tunnel_ops
*ops
; };
330 /* --- Peer statistics --- *
332 * Contains various interesting and not-so-interesting statistics about a
333 * peer. This is updated by various parts of the code. The format of the
334 * structure isn't considered private, and @p_stats@ returns a pointer to the
335 * statistics block for a given peer.
338 typedef struct stats
{
339 unsigned long sz_in
, sz_out
; /* Size of all data in and out */
340 unsigned long sz_kxin
, sz_kxout
; /* Size of key exchange messages */
341 unsigned long sz_ipin
, sz_ipout
; /* Size of encapsulated IP packets */
342 time_t t_start
, t_last
, t_kx
; /* Time peer created, last pk, kx */
343 unsigned long n_reject
; /* Number of rejected packets */
344 unsigned long n_in
, n_out
; /* Number of packets in and out */
345 unsigned long n_kxin
, n_kxout
; /* Number of key exchange packets */
346 unsigned long n_ipin
, n_ipout
; /* Number of encrypted packets */
349 /* --- Peer structure --- *
351 * The main structure which glues everything else together.
354 typedef struct peerspec
{
355 char *name
; /* Peer's name */
356 char *privtag
; /* Private key tag */
357 char *tag
; /* Public key tag */
358 const tunnel_ops
*tops
; /* Tunnel operations */
359 unsigned long t_ka
; /* Keep alive interval */
360 addr sa
; /* Socket address to speak to */
361 size_t sasz
; /* Socket address size */
362 unsigned f
; /* Flags for the peer */
363 #define PSF_KXMASK 255u /* Key-exchange flags to set */
364 #define PSF_MOBILE 256u /* Address may change rapidly */
367 typedef struct peer_byname
{
372 typedef struct peer_byaddr
{
377 typedef struct peer
{
378 peer_byname
*byname
; /* Lookup-by-name block */
379 peer_byaddr
*byaddr
; /* Lookup-by-address block */
380 struct ping
*pings
; /* Pings we're waiting for */
381 peerspec spec
; /* Specifications for this peer */
382 tunnel
*t
; /* Tunnel for local packets */
383 char *ifname
; /* Interface name for tunnel */
384 keyset
*ks
; /* List head for keysets */
385 buf b
; /* Buffer for sending packets */
386 stats st
; /* Statistics */
387 keyexch kx
; /* Key exchange protocol block */
388 sel_timer tka
; /* Timer for keepalives */
391 typedef struct peer_iter
{ sym_iter i
; } peer_iter
;
393 typedef struct ping
{
394 struct ping
*next
, *prev
; /* Links to next and previous */
395 peer
*p
; /* Peer so we can free it */
396 unsigned msg
; /* Kind of response expected */
397 uint32 id
; /* Id so we can recognize response */
398 octet magic
[32]; /* Some random data */
399 sel_timer t
; /* Timeout for ping */
400 void (*func
)(int /*rc*/, void */
*arg*/
); /* Function to call when done */
401 void *arg
; /* Argument for callback */
412 /* --- Admin structure --- */
414 #define OBUFSZ 16384u
416 typedef struct obuf
{
417 struct obuf
*next
; /* Next buffer in list */
418 char *p_in
, *p_out
; /* Pointers into the buffer */
419 char buf
[OBUFSZ
]; /* The actual buffer */
422 typedef struct oqueue
{
423 obuf
*hd
, *tl
; /* Head and tail pointers */
428 typedef struct admin_bgop
{
429 struct admin_bgop
*next
, *prev
; /* Links to next and previous */
430 struct admin
*a
; /* Owner job */
431 char *tag
; /* Tag string for messages */
432 void (*cancel
)(struct admin_bgop
*); /* Destructor function */
435 typedef struct admin_resop
{
436 admin_bgop bg
; /* Background operation header */
437 char *addr
; /* Hostname to be resolved */
438 bres_client r
; /* Background resolver task */
439 sel_timer t
; /* Timer for resolver */
440 addr sa
; /* Socket address */
441 size_t sasz
; /* Socket address size */
442 void (*func
)(struct admin_resop
*, int); /* Handler */
445 enum { ARES_OK
, ARES_FAIL
};
447 typedef struct admin_addop
{
448 admin_resop r
; /* Name resolution header */
449 peerspec peer
; /* Peer pending creation */
452 typedef struct admin_pingop
{
453 admin_bgop bg
; /* Background operation header */
454 ping ping
; /* Ping pending response */
455 struct timeval pingtime
; /* Time last ping was sent */
458 typedef struct admin_service
{
459 sym_base _b
; /* Hash table base structure */
460 char *version
; /* The provided version */
461 struct admin
*prov
; /* Which client provides me */
462 struct admin_service
*next
, *prev
; /* Client's list of services */
465 typedef struct admin_svcop
{
466 admin_bgop bg
; /* Background operation header */
467 struct admin
*prov
; /* Client servicing this job */
468 unsigned index
; /* This job's index */
469 struct admin_svcop
*next
, *prev
; /* Links for provider's jobs */
472 typedef struct admin_jobentry
{
473 unsigned short seq
; /* Zero if unused */
475 admin_svcop
*op
; /* Operation, if slot in use, ... */
476 uint32 next
; /* ... or index of next free slot */
480 typedef struct admin_jobtable
{
481 uint32 n
, sz
; /* Used slots and table size */
482 admin_svcop
*active
; /* List of active jobs */
483 uint32 free
; /* Index of first free slot */
484 admin_jobentry
*v
; /* And the big array of entries */
487 typedef struct admin
{
488 struct admin
*next
, *prev
; /* Links to next and previous */
489 unsigned f
; /* Various useful flags */
490 unsigned ref
; /* Reference counter */
492 unsigned seq
; /* Sequence number for tracing */
494 oqueue out
; /* Output buffer list */
495 oqueue delay
; /* Delayed output buffer list */
496 admin_bgop
*bg
; /* Backgrounded operations */
497 admin_service
*svcs
; /* Which services I provide */
498 admin_jobtable j
; /* Table of outstanding jobs */
499 selbuf b
; /* Line buffer for commands */
500 sel_file w
; /* Selector for write buffering */
503 #define AF_DEAD 1u /* Destroy this admin block */
504 #define AF_CLOSE 2u /* Client closed connection */
505 #define AF_NOTE 4u /* Catch notifications */
506 #define AF_WARN 8u /* Catch warning messages */
508 #define AF_TRACE 16u /* Catch tracing */
510 #define AF_FOREGROUND 32u /* Quit server when client closes */
513 # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN)
515 # define AF_ALLMSGS (AF_NOTE | AF_WARN)
518 /*----- Global variables --------------------------------------------------*/
520 extern sel_state sel
; /* Global I/O event state */
521 extern octet buf_i
[PKBUFSZ
], buf_o
[PKBUFSZ
], buf_t
[PKBUFSZ
], buf_u
[PKBUFSZ
];
522 extern const tunnel_ops
*tunnels
[]; /* Table of tunnels (0-term) */
523 extern const tunnel_ops
*tun_default
; /* Default tunnel to use */
524 extern kdata
*master
; /* Default private key */
525 extern const char *tag_priv
; /* Default private key tag */
528 extern const trace_opt tr_opts
[]; /* Trace options array */
529 extern unsigned tr_flags
; /* Trace options flags */
532 /*----- Other macros ------------------------------------------------------*/
534 #define TIMER noise_timer(RAND_GLOBAL)
536 /*----- Key management ----------------------------------------------------*/
538 /* --- @km_init@ --- *
540 * Arguments: @const char *privkr@ = private keyring file
541 * @const char *pubkr@ = public keyring file
542 * @const char *ptag@ = default private-key tag
546 * Use: Initializes the key-management machinery, loading the
547 * keyrings and so on.
550 extern void km_init(const char */
*privkr*/
, const char */
*pubkr*/
,
551 const char */
*ptag*/
);
553 /* --- @km_reload@ --- *
557 * Returns: Zero if OK, nonzero to force reloading of keys.
559 * Use: Checks the keyrings to see if they need reloading.
562 extern int km_reload(void);
564 /* --- @km_findpub@, @km_findpriv@ --- *
566 * Arguments: @const char *tag@ = key tag to load
568 * Returns: Pointer to the kdata object if successful, or null on error.
570 * Use: Fetches a public or private key from the keyring.
573 extern kdata
*km_findpub(const char */
*tag*/
);
574 extern kdata
*km_findpriv(const char */
*tag*/
);
576 /* --- @km_samealgsp@ --- *
578 * Arguments: @const kdata *kdx, *kdy@ = two key data objects
580 * Returns: Nonzero if their two algorithm selections are the same.
582 * Use: Checks sameness of algorithm selections: used to ensure that
583 * peers are using sensible algorithms.
586 extern int km_samealgsp(const kdata */
*kdx*/
, const kdata */
*kdy*/
);
588 /* --- @km_ref@ --- *
590 * Arguments: @kdata *kd@ = pointer to the kdata object
594 * Use: Claim a new reference to a kdata object.
597 extern void km_ref(kdata */
*kd*/
);
599 /* --- @km_unref@ --- *
601 * Arguments: @kdata *kd@ = pointer to the kdata object
605 * Use: Releases a reference to a kdata object.
608 extern void km_unref(kdata */
*kd*/
);
610 /* --- @km_tag@ --- *
612 * Arguments: @kdata *kd@ - pointer to the kdata object
614 * Returns: A pointer to the short tag by which the kdata was loaded.
617 extern const char *km_tag(kdata */
*kd*/
);
619 /*----- Key exchange ------------------------------------------------------*/
621 /* --- @kx_start@ --- *
623 * Arguments: @keyexch *kx@ = pointer to key exchange context
624 * @int forcep@ = nonzero to ignore the quiet timer
628 * Use: Stimulates a key exchange. If a key exchage is in progress,
629 * a new challenge is sent (unless the quiet timer forbids
630 * this); if no exchange is in progress, one is commenced.
633 extern void kx_start(keyexch */
*kx*/
, int /*forcep*/);
635 /* --- @kx_message@ --- *
637 * Arguments: @keyexch *kx@ = pointer to key exchange context
638 * @unsigned msg@ = the message code
639 * @buf *b@ = pointer to buffer containing the packet
643 * Use: Reads a packet containing key exchange messages and handles
647 extern void kx_message(keyexch */
*kx*/
, unsigned /*msg*/, buf */
*b*/
);
649 /* --- @kx_free@ --- *
651 * Arguments: @keyexch *kx@ = pointer to key exchange context
655 * Use: Frees everything in a key exchange context.
658 extern void kx_free(keyexch */
*kx*/
);
660 /* --- @kx_newkeys@ --- *
662 * Arguments: @keyexch *kx@ = pointer to key exchange context
666 * Use: Informs the key exchange module that its keys may have
667 * changed. If fetching the new keys fails, the peer will be
668 * destroyed, we log messages and struggle along with the old
672 extern void kx_newkeys(keyexch */
*kx*/
);
674 /* --- @kx_init@ --- *
676 * Arguments: @keyexch *kx@ = pointer to key exchange context
677 * @peer *p@ = pointer to peer context
678 * @keyset **ks@ = pointer to keyset list
679 * @unsigned f@ = various useful flags
681 * Returns: Zero if OK, nonzero if it failed.
683 * Use: Initializes a key exchange module. The module currently
684 * contains no keys, and will attempt to initiate a key
688 extern int kx_init(keyexch */
*kx*/
, peer */
*p*/
,
689 keyset
**/
*ks*/
, unsigned /*f*/);
691 /*----- Keysets and symmetric cryptography --------------------------------*/
693 /* --- @ks_drop@ --- *
695 * Arguments: @keyset *ks@ = pointer to a keyset
699 * Use: Decrements a keyset's reference counter. If the counter hits
700 * zero, the keyset is freed.
703 extern void ks_drop(keyset */
*ks*/
);
705 /* --- @ks_gen@ --- *
707 * Arguments: @const void *k@ = pointer to key material
708 * @size_t x, y, z@ = offsets into key material (see below)
709 * @peer *p@ = pointer to peer information
711 * Returns: A pointer to the new keyset.
713 * Use: Derives a new keyset from the given key material. The
714 * offsets @x@, @y@ and @z@ separate the key material into three
715 * parts. Between the @k@ and @k + x@ is `my' contribution to
716 * the key material; between @k + x@ and @k + y@ is `your'
717 * contribution; and between @k + y@ and @k + z@ is a shared
718 * value we made together. These are used to construct two
719 * pairs of symmetric keys. Each pair consists of an encryption
720 * key and a message authentication key. One pair is used for
721 * outgoing messages, the other for incoming messages.
723 * The new key is marked so that it won't be selected for output
724 * by @ksl_encrypt@. You can still encrypt data with it by
725 * calling @ks_encrypt@ directly.
728 extern keyset
*ks_gen(const void */
*k*/
,
729 size_t /*x*/, size_t /*y*/, size_t /*z*/,
732 /* --- @ks_tregen@ --- *
734 * Arguments: @keyset *ks@ = pointer to a keyset
736 * Returns: The time at which moves ought to be made to replace this key.
739 extern time_t ks_tregen(keyset */
*ks*/
);
741 /* --- @ks_activate@ --- *
743 * Arguments: @keyset *ks@ = pointer to a keyset
747 * Use: Activates a keyset, so that it can be used for encrypting
751 extern void ks_activate(keyset */
*ks*/
);
753 /* --- @ks_encrypt@ --- *
755 * Arguments: @keyset *ks@ = pointer to a keyset
756 * @unsigned ty@ = message type
757 * @buf *b@ = pointer to input buffer
758 * @buf *bb@ = pointer to output buffer
760 * Returns: Zero if successful; @KSERR_REGEN@ if we should negotiate a
761 * new key; @KSERR_NOKEYS@ if the key is not usable. Also
762 * returns zero if there was insufficient buffer (but the output
763 * buffer is broken in this case).
765 * Use: Encrypts a block of data using the key. Note that the `key
766 * ought to be replaced' notification is only ever given once
767 * for each key. Also note that this call forces a keyset to be
768 * used even if it's marked as not for data output.
771 extern int ks_encrypt(keyset */
*ks*/
, unsigned /*ty*/,
772 buf */
*b*/
, buf */
*bb*/
);
774 /* --- @ks_decrypt@ --- *
776 * Arguments: @keyset *ks@ = pointer to a keyset
777 * @unsigned ty@ = expected type code
778 * @buf *b@ = pointer to an input buffer
779 * @buf *bb@ = pointer to an output buffer
781 * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
782 * zero if there was insufficient buffer (but the output buffer
783 * is broken in this case).
785 * Use: Attempts to decrypt a message using a given key. Note that
786 * requesting decryption with a key directly won't clear a
787 * marking that it's not for encryption.
790 extern int ks_decrypt(keyset */
*ks*/
, unsigned /*ty*/,
791 buf */
*b*/
, buf */
*bb*/
);
793 /* --- @ksl_free@ --- *
795 * Arguments: @keyset **ksroot@ = pointer to keyset list head
799 * Use: Frees (releases references to) all of the keys in a keyset.
802 extern void ksl_free(keyset
**/
*ksroot*/
);
804 /* --- @ksl_link@ --- *
806 * Arguments: @keyset **ksroot@ = pointer to keyset list head
807 * @keyset *ks@ = pointer to a keyset
811 * Use: Links a keyset into a list. A keyset can only be on one list
812 * at a time. Bad things happen otherwise.
815 extern void ksl_link(keyset
**/
*ksroot*/
, keyset */
*ks*/
);
817 /* --- @ksl_prune@ --- *
819 * Arguments: @keyset **ksroot@ = pointer to keyset list head
823 * Use: Prunes the keyset list by removing keys which mustn't be used
827 extern void ksl_prune(keyset
**/
*ksroot*/
);
829 /* --- @ksl_encrypt@ --- *
831 * Arguments: @keyset **ksroot@ = pointer to keyset list head
832 * @unsigned ty@ = message type
833 * @buf *b@ = pointer to input buffer
834 * @buf *bb@ = pointer to output buffer
836 * Returns: Zero if successful; @KSERR_REGEN@ if it's time to negotiate a
837 * new key; @KSERR_NOKEYS@ if there are no suitable keys
838 * available. Also returns zero if there was insufficient
839 * buffer space (but the output buffer is broken in this case).
841 * Use: Encrypts a packet.
844 extern int ksl_encrypt(keyset
**/
*ksroot*/
, unsigned /*ty*/,
845 buf */
*b*/
, buf */
*bb*/
);
847 /* --- @ksl_decrypt@ --- *
849 * Arguments: @keyset **ksroot@ = pointer to keyset list head
850 * @unsigned ty@ = expected type code
851 * @buf *b@ = pointer to input buffer
852 * @buf *bb@ = pointer to output buffer
854 * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
855 * zero if there was insufficient buffer (but the output buffer
856 * is broken in this case).
858 * Use: Decrypts a packet.
861 extern int ksl_decrypt(keyset
**/
*ksroot*/
, unsigned /*ty*/,
862 buf */
*b*/
, buf */
*bb*/
);
864 /*----- Challenges --------------------------------------------------------*/
868 * Arguments: @buf *b@ = where to put the challenge
870 * Returns: Zero if OK, nonzero on error.
872 * Use: Issues a new challenge.
875 extern int c_new(buf */
*b*/
);
877 /* --- @c_check@ --- *
879 * Arguments: @buf *b@ = where to find the challenge
881 * Returns: Zero if OK, nonzero if it didn't work.
883 * Use: Checks a challenge. On failure, the buffer is broken.
886 extern int c_check(buf */
*b*/
);
888 /*----- Administration interface ------------------------------------------*/
890 #define A_END ((char *)0)
892 /* --- @a_vformat@ --- *
894 * Arguments: @dstr *d@ = where to leave the formatted message
895 * @const char *fmt@ = pointer to format string
896 * @va_list ap@ = arguments in list
900 * Use: Main message token formatting driver. The arguments are
901 * interleaved formatting tokens and their parameters, finally
902 * terminated by an entry @A_END@.
906 * * "*..." ... -- pretokenized @dstr_putf@-like string
908 * * "?ADDR" SOCKADDR -- a socket address, to be converted
910 * * "?B64" BUFFER SIZE -- binary data to be base64-encoded
912 * * "?TOKENS" VECTOR -- null-terminated vector of tokens
914 * * "?PEER" PEER -- peer's name
916 * * "?ERRNO" ERRNO -- system error code
918 * * "[!]..." ... -- @dstr_putf@-like string as single token
921 extern void a_vformat(dstr */
*d*/
, const char */
*fmt*/
, va_list /*ap*/);
923 /* --- @a_format@ --- *
925 * Arguments: @dstr *d@ = where to leave the formatted message
926 * @const char *fmt@ = pointer to format string
930 * Use: Writes a tokenized message into a string, for later
934 extern void a_format(dstr */
*d*/
, const char */
*fmt*/
, ...);
936 /* --- @a_warn@ --- *
938 * Arguments: @const char *fmt@ = pointer to format string
939 * @...@ = other arguments
943 * Use: Informs all admin connections of a warning.
946 extern void a_warn(const char */
*fmt*/
, ...);
948 /* --- @a_notify@ --- *
950 * Arguments: @const char *fmt@ = pointer to format string
951 * @...@ = other arguments
955 * Use: Sends a notification to interested admin connections.
958 extern void a_notify(const char */
*fmt*/
, ...);
960 /* --- @a_create@ --- *
962 * Arguments: @int fd_in, fd_out@ = file descriptors to use
963 * @unsigned f@ = initial flags to set
967 * Use: Creates a new admin connection.
970 extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/);
972 /* --- @a_quit@ --- *
978 * Use: Shuts things down nicely.
981 extern void a_quit(void);
983 /* --- @a_preselect@ --- *
989 * Use: Informs the admin module that we're about to select again,
990 * and that it should do cleanup things it has delayed until a
994 extern void a_preselect(void);
996 /* --- @a_daemon@ --- *
1002 * Use: Informs the admin module that it's a daemon.
1005 extern void a_daemon(void);
1007 /* --- @a_init@ --- *
1009 * Arguments: @const char *sock@ = socket name to create
1010 * @uid_t u@ = user to own the socket
1011 * @gid_t g@ = group to own the socket
1012 * @mode_t m@ = permissions to set on the socket
1016 * Use: Creates the admin listening socket.
1019 extern void a_init(const char */
*sock*/
,
1020 uid_t
/*u*/, gid_t
/*g*/, mode_t
/*m*/);
1022 /*----- Mapping with addresses as keys ------------------------------------*/
1024 /* --- @am_create@ --- *
1026 * Arguments: @addrmap *m@ = pointer to map
1030 * Use: Create an address map, properly set up.
1033 extern void am_create(addrmap */
*m*/
);
1035 /* --- @am_destroy@ --- *
1037 * Arguments: @addrmap *m@ = pointer to map
1041 * Use: Destroy an address map, throwing away all the entries.
1044 extern void am_destroy(addrmap */
*m*/
);
1046 /* --- @am_find@ --- *
1048 * Arguments: @addrmap *m@ = pointer to map
1049 * @const addr *a@ = address to look up
1050 * @size_t sz@ = size of block to allocate
1051 * @unsigned *f@ = where to store flags
1053 * Returns: Pointer to found item, or null.
1055 * Use: Finds a record with the given IP address, set @*f@ nonzero
1056 * and returns it. If @sz@ is zero, and no match was found,
1057 * return null; otherwise allocate a new block of @sz@ bytes,
1058 * clear @*f@ to zero and return the block pointer.
1061 extern void *am_find(addrmap */
*m*/
, const addr */
*a*/
,
1062 size_t /*sz*/, unsigned */
*f*/
);
1064 /* --- @am_remove@ --- *
1066 * Arguments: @addrmap *m@ = pointer to map
1067 * @void *i@ = pointer to the item
1071 * Use: Removes an item from the map.
1074 extern void am_remove(addrmap */
*m*/
, void */
*i*/
);
1076 /*----- Privilege separation ----------------------------------------------*/
1078 /* --- @ps_trace@ --- *
1080 * Arguments: @unsigned mask@ = trace mask to check
1081 * @const char *fmt@ = message format
1082 * @...@ = values for placeholders
1086 * Use: Writes a trace message.
1089 T( extern void ps_trace(unsigned /*mask*/, const char */
*fmt*/
, ...); )
1091 /* --- @ps_warn@ --- *
1093 * Arguments: @const char *fmt@ = message format
1094 * @...@ = values for placeholders
1098 * Use: Writes a warning message.
1101 extern void ps_warn(const char */
*fmt*/
, ...);
1103 /* --- @ps_tunfd@ --- *
1105 * Arguments: @const tunnel_ops *tops@ = pointer to tunnel operations
1106 * @char **ifn@ = where to put the interface name
1108 * Returns: The file descriptor, or @-1@ on error.
1110 * Use: Fetches a file descriptor for a tunnel driver.
1113 extern int ps_tunfd(const tunnel_ops */
*tops*/
, char **/
*ifn*/
);
1115 /* --- @ps_split@ --- *
1117 * Arguments: @int detachp@ = whether to detach the child from its terminal
1121 * Use: Separates off the privileged tunnel-opening service from the
1122 * rest of the server.
1125 extern void ps_split(int /*detachp*/);
1127 /* --- @ps_quit@ --- *
1133 * Use: Detaches from the helper process.
1136 extern void ps_quit(void);
1138 /*----- Peer management ---------------------------------------------------*/
1140 /* --- @p_txstart@ --- *
1142 * Arguments: @peer *p@ = pointer to peer block
1143 * @unsigned msg@ = message type code
1145 * Returns: A pointer to a buffer to write to.
1147 * Use: Starts sending to a peer. Only one send can happen at a
1151 extern buf
*p_txstart(peer */
*p*/
, unsigned /*msg*/);
1153 /* --- @p_txend@ --- *
1155 * Arguments: @peer *p@ = pointer to peer block
1159 * Use: Sends a packet to the peer.
1162 extern void p_txend(peer */
*p*/
);
1164 /* --- @p_pingsend@ --- *
1166 * Arguments: @peer *p@ = destination peer
1167 * @ping *pg@ = structure to fill in
1168 * @unsigned type@ = message type
1169 * @unsigned long timeout@ = how long to wait before giving up
1170 * @void (*func)(int, void *)@ = callback function
1171 * @void *arg@ = argument for callback
1173 * Returns: Zero if successful, nonzero if it failed.
1175 * Use: Sends a ping to a peer. Call @func@ with a nonzero argument
1176 * if we get an answer within the timeout, or zero if no answer.
1179 extern int p_pingsend(peer */
*p*/
, ping */
*pg*/
, unsigned /*type*/,
1180 unsigned long /*timeout*/,
1181 void (*/
*func*/
)(int, void *), void */
*arg*/
);
1183 /* --- @p_pingdone@ --- *
1185 * Arguments: @ping *p@ = ping structure
1186 * @int rc@ = return code to pass on
1190 * Use: Disposes of a ping structure, maybe sending a notification.
1193 extern void p_pingdone(ping */
*p*/
, int /*rc*/);
1195 /* --- @p_greet@ --- *
1197 * Arguments: @peer *p@ = peer to send to
1198 * @const void *c@ = pointer to challenge
1199 * @size_t sz@ = size of challenge
1203 * Use: Sends a greeting packet.
1206 extern void p_greet(peer */
*p*/
, const void */
*c*/
, size_t /*sz*/);
1208 /* --- @p_tun@ --- *
1210 * Arguments: @peer *p@ = pointer to peer block
1211 * @buf *b@ = buffer containing incoming packet
1215 * Use: Handles a packet which needs to be sent to a peer.
1218 extern void p_tun(peer */
*p*/
, buf */
*b*/
);
1220 /* --- @p_keyreload@ --- *
1226 * Use: Forces a check of the daemon's keyring files.
1229 extern void p_keyreload(void);
1231 /* --- @p_interval@ --- *
1237 * Use: Called periodically to do tidying.
1240 extern void p_interval(void);
1242 /* --- @p_stats@ --- *
1244 * Arguments: @peer *p@ = pointer to a peer block
1246 * Returns: A pointer to the peer's statistics.
1249 extern stats
*p_stats(peer */
*p*/
);
1251 /* --- @p_ifname@ --- *
1253 * Arguments: @peer *p@ = pointer to a peer block
1255 * Returns: A pointer to the peer's interface name.
1258 extern const char *p_ifname(peer */
*p*/
);
1260 /* --- @p_setifname@ --- *
1262 * Arguments: @peer *p@ = pointer to a peer block
1263 * @const char *name@ = pointer to the new name
1267 * Use: Changes the name held for a peer's interface.
1270 extern void p_setifname(peer */
*p*/
, const char */
*name*/
);
1272 /* --- @p_addr@ --- *
1274 * Arguments: @peer *p@ = pointer to a peer block
1276 * Returns: A pointer to the peer's address.
1279 extern const addr
*p_addr(peer */
*p*/
);
1281 /* --- @p_init@ --- *
1283 * Arguments: @struct in_addr addr@ = address to bind to
1284 * @unsigned port@ = port number to listen to
1288 * Use: Initializes the peer system; creates the socket.
1291 extern void p_init(struct in_addr
/*addr*/, unsigned /*port*/);
1293 /* --- @p_port@ --- *
1297 * Returns: Port number used for socket.
1300 unsigned p_port(void);
1302 /* --- @p_create@ --- *
1304 * Arguments: @peerspec *spec@ = information about this peer
1306 * Returns: Pointer to the peer block, or null if it failed.
1308 * Use: Creates a new named peer block. No peer is actually attached
1312 extern peer
*p_create(peerspec */
*spec*/
);
1314 /* --- @p_name@ --- *
1316 * Arguments: @peer *p@ = pointer to a peer block
1318 * Returns: A pointer to the peer's name.
1320 * Use: Equivalent to @p_spec(p)->name@.
1323 extern const char *p_name(peer */
*p*/
);
1325 /* --- @p_tag@ --- *
1327 * Arguments: @peer *p@ = pointer to a peer block
1329 * Returns: A pointer to the peer's public key tag.
1332 extern const char *p_tag(peer */
*p*/
);
1334 /* --- @p_privtag@ --- *
1336 * Arguments: @peer *p@ = pointer to a peer block
1338 * Returns: A pointer to the peer's private key tag.
1341 extern const char *p_privtag(peer */
*p*/
);
1343 /* --- @p_spec@ --- *
1345 * Arguments: @peer *p@ = pointer to a peer block
1347 * Returns: Pointer to the peer's specification
1350 extern const peerspec
*p_spec(peer */
*p*/
);
1352 /* --- @p_findbyaddr@ --- *
1354 * Arguments: @const addr *a@ = address to look up
1356 * Returns: Pointer to the peer block, or null if not found.
1358 * Use: Finds a peer by address.
1361 extern peer
*p_findbyaddr(const addr */
*a*/
);
1363 /* --- @p_find@ --- *
1365 * Arguments: @const char *name@ = name to look up
1367 * Returns: Pointer to the peer block, or null if not found.
1369 * Use: Finds a peer by name.
1372 extern peer
*p_find(const char */
*name*/
);
1374 /* --- @p_destroy@ --- *
1376 * Arguments: @peer *p@ = pointer to a peer
1380 * Use: Destroys a peer.
1383 extern void p_destroy(peer */
*p*/
);
1385 /* --- @FOREACH_PEER@ --- *
1387 * Arguments: @p@ = name to bind to each peer
1388 * @stuff@ = thing to do for each item
1390 * Use: Does something for each current peer.
1393 #define FOREACH_PEER(p, stuff) do { \
1396 for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) stuff \
1399 /* --- @p_mkiter@ --- *
1401 * Arguments: @peer_iter *i@ = pointer to an iterator
1405 * Use: Initializes the iterator.
1408 extern void p_mkiter(peer_iter */
*i*/
);
1410 /* --- @p_next@ --- *
1412 * Arguments: @peer_iter *i@ = pointer to an iterator
1414 * Returns: Next peer, or null if at the end.
1416 * Use: Returns the next peer.
1419 extern peer
*p_next(peer_iter */
*i*/
);
1421 /*----- Tunnel drivers ----------------------------------------------------*/
1424 extern const tunnel_ops tun_linux
;
1428 extern const tunnel_ops tun_unet
;
1432 extern const tunnel_ops tun_bsd
;
1435 extern const tunnel_ops tun_slip
;
1437 /*----- Other handy utilities ---------------------------------------------*/
1439 /* --- @mpstr@ --- *
1441 * Arguments: @mp *m@ = a multiprecision integer
1443 * Returns: A pointer to the integer's textual representation.
1445 * Use: Converts a multiprecision integer to a string. Corrupts
1449 extern const char *mpstr(mp */
*m*/
);
1451 /* --- @gestr@ --- *
1453 * Arguments: @group *g@ = a group
1454 * @ge *x@ = a group element
1456 * Returns: A pointer to the element's textual representation.
1458 * Use: Converts a group element to a string. Corrupts
1462 extern const char *gestr(group */
*g*/
, ge */
*x*/
);
1464 /* --- @timestr@ --- *
1466 * Arguments: @time_t t@ = a time to convert
1468 * Returns: A pointer to a textual representation of the time.
1470 * Use: Converts a time to a textual representation. Corrupts
1474 extern const char *timestr(time_t /*t*/);
1476 /* --- @mystrieq@ --- *
1478 * Arguments: @const char *x, *y@ = two strings
1480 * Returns: True if @x@ and @y are equal, up to case.
1483 extern int mystrieq(const char */
*x*/
, const char */
*y*/
);
1485 /* --- @seq_reset@ --- *
1487 * Arguments: @seqwin *s@ = sequence-checking window
1491 * Use: Resets a sequence number window.
1494 extern void seq_reset(seqwin */
*s*/
);
1496 /* --- @seq_check@ --- *
1498 * Arguments: @seqwin *s@ = sequence-checking window
1499 * @uint32 q@ = sequence number to check
1500 * @const char *service@ = service to report message from
1502 * Returns: A @SEQ_@ code.
1504 * Use: Checks a sequence number against the window, updating things
1508 extern int seq_check(seqwin */
*s*/
, uint32
/*q*/, const char */
*service*/
);
1510 /*----- That's all, folks -------------------------------------------------*/