d1093f7b774874659cde5cd04419dd5a48cc8560
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 extern algswitch algs
;
158 #define MAXHASHSZ 64 /* Largest possible hash size */
160 #define HASH_STRING(h, s) GH_HASH((h), (s), sizeof(s))
162 /*----- Data structures ---------------------------------------------------*/
164 /* --- Socket addresses --- *
166 * A magic union of supported socket addresses.
171 struct sockaddr_in sin
;
174 /* --- Mapping keyed on addresses --- */
176 typedef struct addrmap
{
181 typedef struct addrmap_base
{
186 /* --- Sequence number checking --- */
188 typedef struct seqwin
{
189 uint32 seq
; /* First acceptable input sequence */
190 uint32 win
; /* Window of acceptable numbers */
193 #define SEQ_WINSZ 32 /* Bits in sequence number window */
195 /* --- A symmetric keyset --- *
197 * A keyset contains a set of symmetric keys for encrypting and decrypting
198 * packets. Keysets are stored in a list, sorted in reverse order of
199 * creation, so that the most recent keyset (the one most likely to be used)
202 * Each keyset has a time limit and a data limit. The keyset is destroyed
203 * when either it has existed for too long, or it has been used to encrypt
204 * too much data. New key exchanges are triggered when keys are close to
208 typedef struct keyset
{
209 struct keyset
*next
; /* Next active keyset in the list */
210 unsigned ref
; /* Reference count for keyset */
211 struct peer
*p
; /* Pointer to peer structure */
212 time_t t_exp
; /* Expiry time for this keyset */
213 unsigned long sz_exp
, sz_regen
; /* Data limits for the keyset */
214 T( unsigned seq
; ) /* Sequence number for tracing */
215 unsigned f
; /* Various useful flags */
216 gcipher
*cin
, *cout
; /* Keyset ciphers for encryption */
217 size_t tagsz
; /* Length to truncate MAC tags */
218 gmac
*min
, *mout
; /* Keyset MACs for integrity */
219 uint32 oseq
; /* Outbound sequence number */
220 seqwin iseq
; /* Inbound sequence number */
223 #define KSF_LISTEN 1u /* Don't encrypt packets yet */
224 #define KSF_LINK 2u /* Key is in a linked list */
226 #define KSERR_REGEN -1 /* Regenerate keys */
227 #define KSERR_NOKEYS -2 /* No keys left */
228 #define KSERR_DECRYPT -3 /* Unable to decrypt message */
230 /* --- Key exchange --- *
232 * TrIPE uses the Wrestlers Protocol for its key exchange. The Wrestlers
233 * Protocol has a number of desirable features (e.g., perfect forward
234 * secrecy, and zero-knowledge authentication) which make it attractive for
235 * use in TrIPE. The Wrestlers Protocol was designed by Mark Wooding and
241 typedef struct kxchal
{
242 struct keyexch
*kx
; /* Pointer back to key exchange */
243 ge
*c
; /* Responder's challenge */
244 ge
*r
; /* My reply to the challenge */
245 keyset
*ks
; /* Pointer to temporary keyset */
246 unsigned f
; /* Various useful flags */
247 sel_timer t
; /* Response timer for challenge */
248 octet hc
[MAXHASHSZ
]; /* Hash of his challenge */
249 octet ck
[MAXHASHSZ
]; /* His magical check value */
250 octet hswrq_in
[MAXHASHSZ
]; /* Inbound switch request message */
251 octet hswok_in
[MAXHASHSZ
]; /* Inbound switch confirmation */
252 octet hswrq_out
[MAXHASHSZ
]; /* Outbound switch request message */
253 octet hswok_out
[MAXHASHSZ
]; /* Outbound switch confirmation */
256 typedef struct keyexch
{
257 struct peer
*p
; /* Pointer back to the peer */
258 keyset
**ks
; /* Peer's list of keysets */
259 unsigned f
; /* Various useful flags */
260 unsigned s
; /* Current state in exchange */
261 sel_timer t
; /* Timer for next exchange */
262 ge
*kpub
; /* Peer's public key */
263 time_t texp_kpub
; /* Expiry time for public key */
264 mp
*alpha
; /* My temporary secret */
265 ge
*c
; /* My challenge */
266 ge
*rx
; /* The expected response */
267 unsigned nr
; /* Number of extant responses */
268 time_t t_valid
; /* When this exchange goes bad */
269 octet hc
[MAXHASHSZ
]; /* Hash of my challenge */
270 kxchal
*r
[KX_NCHAL
]; /* Array of challenges */
273 #define KXF_TIMER 1u /* Waiting for a timer to go off */
274 #define KXF_DEAD 2u /* The key-exchanger isn't up */
275 #define KXF_PUBKEY 4u /* Key exchanger has a public key */
276 #define KXF_CORK 8u /* Don't send anything yet */
279 KXS_DEAD
, /* Uninitialized state (magical) */
280 KXS_CHAL
, /* Main answer-challenges state */
281 KXS_COMMIT
, /* Committed: send switch request */
282 KXS_SWITCH
/* Switched: send confirmation */
285 /* --- Tunnel structure --- *
287 * Used to maintain system-specific information about the tunnel interface.
290 typedef struct tunnel tunnel
;
293 typedef struct tunnel_ops
{
294 const char *name
; /* Name of this tunnel driver */
295 unsigned flags
; /* Various interesting flags */
296 #define TUNF_PRIVOPEN 1u /* Need helper to open file */
297 void (*init
)(void); /* Initializes the system */
298 tunnel
*(*create
)(struct peer */
*p*/
, int /*fd*/, char **/
*ifn*/
);
299 /* Initializes a new tunnel */
300 void (*setifname
)(tunnel */
*t*/
, const char */
*ifn*/
);
301 /* Notifies ifname change */
302 void (*inject
)(tunnel */
*t*/
, buf */
*b*/
); /* Sends packet through if */
303 void (*destroy
)(tunnel */
*t*/
); /* Destroys a tunnel */
306 #ifndef TUN_INTERNALS
307 struct tunnel
{ const tunnel_ops
*ops
; };
310 /* --- Peer statistics --- *
312 * Contains various interesting and not-so-interesting statistics about a
313 * peer. This is updated by various parts of the code. The format of the
314 * structure isn't considered private, and @p_stats@ returns a pointer to the
315 * statistics block for a given peer.
318 typedef struct stats
{
319 unsigned long sz_in
, sz_out
; /* Size of all data in and out */
320 unsigned long sz_kxin
, sz_kxout
; /* Size of key exchange messages */
321 unsigned long sz_ipin
, sz_ipout
; /* Size of encapsulated IP packets */
322 time_t t_start
, t_last
, t_kx
; /* Time peer created, last pk, kx */
323 unsigned long n_reject
; /* Number of rejected packets */
324 unsigned long n_in
, n_out
; /* Number of packets in and out */
325 unsigned long n_kxin
, n_kxout
; /* Number of key exchange packets */
326 unsigned long n_ipin
, n_ipout
; /* Number of encrypted packets */
329 /* --- Peer structure --- *
331 * The main structure which glues everything else together.
334 typedef struct peerspec
{
335 char *name
; /* Peer's name */
336 char *tag
; /* Public key tag */
337 const tunnel_ops
*tops
; /* Tunnel operations */
338 unsigned long t_ka
; /* Keep alive interval */
339 addr sa
; /* Socket address to speak to */
340 size_t sasz
; /* Socket address size */
341 unsigned kxf
; /* Key exchange flags to set */
344 typedef struct peer_byname
{
349 typedef struct peer_byaddr
{
354 typedef struct peer
{
355 peer_byname
*byname
; /* Lookup-by-name block */
356 peer_byaddr
*byaddr
; /* Lookup-by-address block */
357 struct ping
*pings
; /* Pings we're waiting for */
358 peerspec spec
; /* Specifications for this peer */
359 tunnel
*t
; /* Tunnel for local packets */
360 char *ifname
; /* Interface name for tunnel */
361 keyset
*ks
; /* List head for keysets */
362 buf b
; /* Buffer for sending packets */
363 stats st
; /* Statistics */
364 keyexch kx
; /* Key exchange protocol block */
365 sel_timer tka
; /* Timer for keepalives */
368 typedef struct peer_iter
{ sym_iter i
; } peer_iter
;
370 typedef struct ping
{
371 struct ping
*next
, *prev
; /* Links to next and previous */
372 peer
*p
; /* Peer so we can free it */
373 unsigned msg
; /* Kind of response expected */
374 uint32 id
; /* Id so we can recognize response */
375 octet magic
[32]; /* Some random data */
376 sel_timer t
; /* Timeout for ping */
377 void (*func
)(int /*rc*/, void */
*arg*/
); /* Function to call when done */
378 void *arg
; /* Argument for callback */
389 /* --- Admin structure --- */
391 #define OBUFSZ 16384u
393 typedef struct obuf
{
394 struct obuf
*next
; /* Next buffer in list */
395 char *p_in
, *p_out
; /* Pointers into the buffer */
396 char buf
[OBUFSZ
]; /* The actual buffer */
399 typedef struct oqueue
{
400 obuf
*hd
, *tl
; /* Head and tail pointers */
405 typedef struct admin_bgop
{
406 struct admin_bgop
*next
, *prev
; /* Links to next and previous */
407 struct admin
*a
; /* Owner job */
408 char *tag
; /* Tag string for messages */
409 void (*cancel
)(struct admin_bgop
*); /* Destructor function */
412 typedef struct admin_resop
{
413 admin_bgop bg
; /* Background operation header */
414 char *addr
; /* Hostname to be resolved */
415 bres_client r
; /* Background resolver task */
416 sel_timer t
; /* Timer for resolver */
417 addr sa
; /* Socket address */
418 size_t sasz
; /* Socket address size */
419 void (*func
)(struct admin_resop
*, int); /* Handler */
422 enum { ARES_OK
, ARES_FAIL
};
424 typedef struct admin_addop
{
425 admin_resop r
; /* Name resolution header */
426 peerspec peer
; /* Peer pending creation */
429 typedef struct admin_pingop
{
430 admin_bgop bg
; /* Background operation header */
431 ping ping
; /* Ping pending response */
432 struct timeval pingtime
; /* Time last ping was sent */
435 typedef struct admin_service
{
436 sym_base _b
; /* Hash table base structure */
437 char *version
; /* The provided version */
438 struct admin
*prov
; /* Which client provides me */
439 struct admin_service
*next
, *prev
; /* Client's list of services */
442 typedef struct admin_svcop
{
443 admin_bgop bg
; /* Background operation header */
444 struct admin
*prov
; /* Client servicing this job */
445 unsigned index
; /* This job's index */
446 struct admin_svcop
*next
, *prev
; /* Links for provider's jobs */
449 typedef struct admin_jobentry
{
450 unsigned short seq
; /* Zero if unused */
452 admin_svcop
*op
; /* Operation, if slot in use, ... */
453 uint32 next
; /* ... or index of next free slot */
457 typedef struct admin_jobtable
{
458 uint32 n
, sz
; /* Used slots and table size */
459 admin_svcop
*active
; /* List of active jobs */
460 uint32 free
; /* Index of first free slot */
461 admin_jobentry
*v
; /* And the big array of entries */
464 typedef struct admin
{
465 struct admin
*next
, *prev
; /* Links to next and previous */
466 unsigned f
; /* Various useful flags */
467 unsigned ref
; /* Reference counter */
469 unsigned seq
; /* Sequence number for tracing */
471 oqueue out
; /* Output buffer list */
472 oqueue delay
; /* Delayed output buffer list */
473 admin_bgop
*bg
; /* Backgrounded operations */
474 admin_service
*svcs
; /* Which services I provide */
475 admin_jobtable j
; /* Table of outstanding jobs */
476 selbuf b
; /* Line buffer for commands */
477 sel_file w
; /* Selector for write buffering */
480 #define AF_DEAD 1u /* Destroy this admin block */
481 #define AF_CLOSE 2u /* Client closed connection */
482 #define AF_NOTE 4u /* Catch notifications */
483 #define AF_WARN 8u /* Catch warning messages */
485 #define AF_TRACE 16u /* Catch tracing */
487 #define AF_FOREGROUND 32u /* Quit server when client closes */
490 # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN)
492 # define AF_ALLMSGS (AF_NOTE | AF_WARN)
495 /*----- Global variables --------------------------------------------------*/
497 extern sel_state sel
; /* Global I/O event state */
498 extern group
*gg
; /* The group we work in */
499 extern size_t indexsz
; /* Size of exponent for the group */
500 extern mp
*kpriv
; /* Our private key */
501 extern ge
*kpub
; /* Our public key */
502 extern octet buf_i
[PKBUFSZ
], buf_o
[PKBUFSZ
], buf_t
[PKBUFSZ
], buf_u
[PKBUFSZ
];
503 extern const tunnel_ops
*tunnels
[]; /* Table of tunnels (0-term) */
504 extern const tunnel_ops
*tun_default
; /* Default tunnel to use */
507 extern const trace_opt tr_opts
[]; /* Trace options array */
508 extern unsigned tr_flags
; /* Trace options flags */
511 /*----- Other macros ------------------------------------------------------*/
513 #define TIMER noise_timer(RAND_GLOBAL)
515 /*----- Key management ----------------------------------------------------*/
517 /* --- @km_reload@ --- *
521 * Returns: Zero if OK, nonzero to force reloading of keys.
523 * Use: Checks the keyrings to see if they need reloading.
526 extern int km_reload(void);
528 /* --- @km_init@ --- *
530 * Arguments: @const char *kr_priv@ = private keyring file
531 * @const char *kr_pub@ = public keyring file
532 * @const char *tag@ = tag to load
536 * Use: Initializes, and loads the private key.
539 extern void km_init(const char */
*kr_priv*/
, const char */
*kr_pub*/
,
540 const char */
*tag*/
);
542 /* --- @km_getpubkey@ --- *
544 * Arguments: @const char *tag@ = public key tag to load
545 * @ge *kpub@ = where to put the public key
546 * @time_t *t_exp@ = where to put the expiry time
548 * Returns: Zero if OK, nonzero if it failed.
550 * Use: Fetches a public key from the keyring.
553 extern int km_getpubkey(const char */
*tag*/
, ge */
*kpub*/
,
556 /*----- Key exchange ------------------------------------------------------*/
558 /* --- @kx_start@ --- *
560 * Arguments: @keyexch *kx@ = pointer to key exchange context
561 * @int forcep@ = nonzero to ignore the quiet timer
565 * Use: Stimulates a key exchange. If a key exchage is in progress,
566 * a new challenge is sent (unless the quiet timer forbids
567 * this); if no exchange is in progress, one is commenced.
570 extern void kx_start(keyexch */
*kx*/
, int /*forcep*/);
572 /* --- @kx_message@ --- *
574 * Arguments: @keyexch *kx@ = pointer to key exchange context
575 * @unsigned msg@ = the message code
576 * @buf *b@ = pointer to buffer containing the packet
580 * Use: Reads a packet containing key exchange messages and handles
584 extern void kx_message(keyexch */
*kx*/
, unsigned /*msg*/, buf */
*b*/
);
586 /* --- @kx_free@ --- *
588 * Arguments: @keyexch *kx@ = pointer to key exchange context
592 * Use: Frees everything in a key exchange context.
595 extern void kx_free(keyexch */
*kx*/
);
597 /* --- @kx_newkeys@ --- *
599 * Arguments: @keyexch *kx@ = pointer to key exchange context
603 * Use: Informs the key exchange module that its keys may have
604 * changed. If fetching the new keys fails, the peer will be
605 * destroyed, we log messages and struggle along with the old
609 extern void kx_newkeys(keyexch */
*kx*/
);
611 /* --- @kx_init@ --- *
613 * Arguments: @keyexch *kx@ = pointer to key exchange context
614 * @peer *p@ = pointer to peer context
615 * @keyset **ks@ = pointer to keyset list
616 * @unsigned f@ = various useful flags
618 * Returns: Zero if OK, nonzero if it failed.
620 * Use: Initializes a key exchange module. The module currently
621 * contains no keys, and will attempt to initiate a key
625 extern int kx_init(keyexch */
*kx*/
, peer */
*p*/
,
626 keyset
**/
*ks*/
, unsigned /*f*/);
628 /*----- Keysets and symmetric cryptography --------------------------------*/
630 /* --- @ks_drop@ --- *
632 * Arguments: @keyset *ks@ = pointer to a keyset
636 * Use: Decrements a keyset's reference counter. If the counter hits
637 * zero, the keyset is freed.
640 extern void ks_drop(keyset */
*ks*/
);
642 /* --- @ks_gen@ --- *
644 * Arguments: @const void *k@ = pointer to key material
645 * @size_t x, y, z@ = offsets into key material (see below)
646 * @peer *p@ = pointer to peer information
648 * Returns: A pointer to the new keyset.
650 * Use: Derives a new keyset from the given key material. The
651 * offsets @x@, @y@ and @z@ separate the key material into three
652 * parts. Between the @k@ and @k + x@ is `my' contribution to
653 * the key material; between @k + x@ and @k + y@ is `your'
654 * contribution; and between @k + y@ and @k + z@ is a shared
655 * value we made together. These are used to construct two
656 * pairs of symmetric keys. Each pair consists of an encryption
657 * key and a message authentication key. One pair is used for
658 * outgoing messages, the other for incoming messages.
660 * The new key is marked so that it won't be selected for output
661 * by @ksl_encrypt@. You can still encrypt data with it by
662 * calling @ks_encrypt@ directly.
665 extern keyset
*ks_gen(const void */
*k*/
,
666 size_t /*x*/, size_t /*y*/, size_t /*z*/,
669 /* --- @ks_tregen@ --- *
671 * Arguments: @keyset *ks@ = pointer to a keyset
673 * Returns: The time at which moves ought to be made to replace this key.
676 extern time_t ks_tregen(keyset */
*ks*/
);
678 /* --- @ks_activate@ --- *
680 * Arguments: @keyset *ks@ = pointer to a keyset
684 * Use: Activates a keyset, so that it can be used for encrypting
688 extern void ks_activate(keyset */
*ks*/
);
690 /* --- @ks_encrypt@ --- *
692 * Arguments: @keyset *ks@ = pointer to a keyset
693 * @unsigned ty@ = message type
694 * @buf *b@ = pointer to input buffer
695 * @buf *bb@ = pointer to output buffer
697 * Returns: Zero if successful; @KSERR_REGEN@ if we should negotiate a
698 * new key; @KSERR_NOKEYS@ if the key is not usable. Also
699 * returns zero if there was insufficient buffer (but the output
700 * buffer is broken in this case).
702 * Use: Encrypts a block of data using the key. Note that the `key
703 * ought to be replaced' notification is only ever given once
704 * for each key. Also note that this call forces a keyset to be
705 * used even if it's marked as not for data output.
708 extern int ks_encrypt(keyset */
*ks*/
, unsigned /*ty*/,
709 buf */
*b*/
, buf */
*bb*/
);
711 /* --- @ks_decrypt@ --- *
713 * Arguments: @keyset *ks@ = pointer to a keyset
714 * @unsigned ty@ = expected type code
715 * @buf *b@ = pointer to an input buffer
716 * @buf *bb@ = pointer to an output buffer
718 * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
719 * zero if there was insufficient buffer (but the output buffer
720 * is broken in this case).
722 * Use: Attempts to decrypt a message using a given key. Note that
723 * requesting decryption with a key directly won't clear a
724 * marking that it's not for encryption.
727 extern int ks_decrypt(keyset */
*ks*/
, unsigned /*ty*/,
728 buf */
*b*/
, buf */
*bb*/
);
730 /* --- @ksl_free@ --- *
732 * Arguments: @keyset **ksroot@ = pointer to keyset list head
736 * Use: Frees (releases references to) all of the keys in a keyset.
739 extern void ksl_free(keyset
**/
*ksroot*/
);
741 /* --- @ksl_link@ --- *
743 * Arguments: @keyset **ksroot@ = pointer to keyset list head
744 * @keyset *ks@ = pointer to a keyset
748 * Use: Links a keyset into a list. A keyset can only be on one list
749 * at a time. Bad things happen otherwise.
752 extern void ksl_link(keyset
**/
*ksroot*/
, keyset */
*ks*/
);
754 /* --- @ksl_prune@ --- *
756 * Arguments: @keyset **ksroot@ = pointer to keyset list head
760 * Use: Prunes the keyset list by removing keys which mustn't be used
764 extern void ksl_prune(keyset
**/
*ksroot*/
);
766 /* --- @ksl_encrypt@ --- *
768 * Arguments: @keyset **ksroot@ = pointer to keyset list head
769 * @unsigned ty@ = message type
770 * @buf *b@ = pointer to input buffer
771 * @buf *bb@ = pointer to output buffer
773 * Returns: Zero if successful; @KSERR_REGEN@ if it's time to negotiate a
774 * new key; @KSERR_NOKEYS@ if there are no suitable keys
775 * available. Also returns zero if there was insufficient
776 * buffer space (but the output buffer is broken in this case).
778 * Use: Encrypts a packet.
781 extern int ksl_encrypt(keyset
**/
*ksroot*/
, unsigned /*ty*/,
782 buf */
*b*/
, buf */
*bb*/
);
784 /* --- @ksl_decrypt@ --- *
786 * Arguments: @keyset **ksroot@ = pointer to keyset list head
787 * @unsigned ty@ = expected type code
788 * @buf *b@ = pointer to input buffer
789 * @buf *bb@ = pointer to output buffer
791 * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
792 * zero if there was insufficient buffer (but the output buffer
793 * is broken in this case).
795 * Use: Decrypts a packet.
798 extern int ksl_decrypt(keyset
**/
*ksroot*/
, unsigned /*ty*/,
799 buf */
*b*/
, buf */
*bb*/
);
801 /*----- Challenges --------------------------------------------------------*/
805 * Arguments: @buf *b@ = where to put the challenge
807 * Returns: Zero if OK, nonzero on error.
809 * Use: Issues a new challenge.
812 extern int c_new(buf */
*b*/
);
814 /* --- @c_check@ --- *
816 * Arguments: @buf *b@ = where to find the challenge
818 * Returns: Zero if OK, nonzero if it didn't work.
820 * Use: Checks a challenge. On failure, the buffer is broken.
823 extern int c_check(buf */
*b*/
);
825 /*----- Administration interface ------------------------------------------*/
827 #define A_END ((char *)0)
829 /* --- @a_vformat@ --- *
831 * Arguments: @dstr *d@ = where to leave the formatted message
832 * @const char *fmt@ = pointer to format string
833 * @va_list ap@ = arguments in list
837 * Use: Main message token formatting driver. The arguments are
838 * interleaved formatting tokens and their parameters, finally
839 * terminated by an entry @A_END@.
843 * * "*..." ... -- pretokenized @dstr_putf@-like string
845 * * "?ADDR" SOCKADDR -- a socket address, to be converted
847 * * "?B64" BUFFER SIZE -- binary data to be base64-encoded
849 * * "?TOKENS" VECTOR -- null-terminated vector of tokens
851 * * "?PEER" PEER -- peer's name
853 * * "?ERRNO" ERRNO -- system error code
855 * * "[!]..." ... -- @dstr_putf@-like string as single token
858 extern void a_vformat(dstr */
*d*/
, const char */
*fmt*/
, va_list /*ap*/);
860 /* --- @a_warn@ --- *
862 * Arguments: @const char *fmt@ = pointer to format string
863 * @...@ = other arguments
867 * Use: Informs all admin connections of a warning.
870 extern void a_warn(const char */
*fmt*/
, ...);
872 /* --- @a_notify@ --- *
874 * Arguments: @const char *fmt@ = pointer to format string
875 * @...@ = other arguments
879 * Use: Sends a notification to interested admin connections.
882 extern void a_notify(const char */
*fmt*/
, ...);
884 /* --- @a_create@ --- *
886 * Arguments: @int fd_in, fd_out@ = file descriptors to use
887 * @unsigned f@ = initial flags to set
891 * Use: Creates a new admin connection.
894 extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/);
896 /* --- @a_quit@ --- *
902 * Use: Shuts things down nicely.
905 extern void a_quit(void);
907 /* --- @a_preselect@ --- *
913 * Use: Informs the admin module that we're about to select again,
914 * and that it should do cleanup things it has delayed until a
918 extern void a_preselect(void);
920 /* --- @a_daemon@ --- *
926 * Use: Informs the admin module that it's a daemon.
929 extern void a_daemon(void);
931 /* --- @a_init@ --- *
933 * Arguments: @const char *sock@ = socket name to create
934 * @uid_t u@ = user to own the socket
935 * @gid_t g@ = group to own the socket
939 * Use: Creates the admin listening socket.
942 extern void a_init(const char */
*sock*/
, uid_t
/*u*/, gid_t
/*g*/);
944 /*----- Mapping with addresses as keys ------------------------------------*/
946 /* --- @am_create@ --- *
948 * Arguments: @addrmap *m@ = pointer to map
952 * Use: Create an address map, properly set up.
955 extern void am_create(addrmap */
*m*/
);
957 /* --- @am_destroy@ --- *
959 * Arguments: @addrmap *m@ = pointer to map
963 * Use: Destroy an address map, throwing away all the entries.
966 extern void am_destroy(addrmap */
*m*/
);
968 /* --- @am_find@ --- *
970 * Arguments: @addrmap *m@ = pointer to map
971 * @const addr *a@ = address to look up
972 * @size_t sz@ = size of block to allocate
973 * @unsigned *f@ = where to store flags
975 * Returns: Pointer to found item, or null.
977 * Use: Finds a record with the given IP address, set @*f@ nonzero
978 * and returns it. If @sz@ is zero, and no match was found,
979 * return null; otherwise allocate a new block of @sz@ bytes,
980 * clear @*f@ to zero and return the block pointer.
983 extern void *am_find(addrmap */
*m*/
, const addr */
*a*/
,
984 size_t /*sz*/, unsigned */
*f*/
);
986 /* --- @am_remove@ --- *
988 * Arguments: @addrmap *m@ = pointer to map
989 * @void *i@ = pointer to the item
993 * Use: Removes an item from the map.
996 extern void am_remove(addrmap */
*m*/
, void */
*i*/
);
998 /*----- Privilege separation ----------------------------------------------*/
1000 /* --- @ps_trace@ --- *
1002 * Arguments: @unsigned mask@ = trace mask to check
1003 * @const char *fmt@ = message format
1004 * @...@ = values for placeholders
1008 * Use: Writes a trace message.
1011 T( extern void ps_trace(unsigned /*mask*/, const char */
*fmt*/
, ...); )
1013 /* --- @ps_warn@ --- *
1015 * Arguments: @const char *fmt@ = message format
1016 * @...@ = values for placeholders
1020 * Use: Writes a warning message.
1023 extern void ps_warn(const char */
*fmt*/
, ...);
1025 /* --- @ps_tunfd@ --- *
1027 * Arguments: @const tunnel_ops *tops@ = pointer to tunnel operations
1028 * @char **ifn@ = where to put the interface name
1030 * Returns: The file descriptor, or @-1@ on error.
1032 * Use: Fetches a file descriptor for a tunnel driver.
1035 extern int ps_tunfd(const tunnel_ops */
*tops*/
, char **/
*ifn*/
);
1037 /* --- @ps_split@ --- *
1039 * Arguments: @int detachp@ = whether to detach the child from its terminal
1043 * Use: Separates off the privileged tunnel-opening service from the
1044 * rest of the server.
1047 extern void ps_split(int /*detachp*/);
1049 /* --- @ps_quit@ --- *
1055 * Use: Detaches from the helper process.
1058 extern void ps_quit(void);
1060 /*----- Peer management ---------------------------------------------------*/
1062 /* --- @p_txstart@ --- *
1064 * Arguments: @peer *p@ = pointer to peer block
1065 * @unsigned msg@ = message type code
1067 * Returns: A pointer to a buffer to write to.
1069 * Use: Starts sending to a peer. Only one send can happen at a
1073 extern buf
*p_txstart(peer */
*p*/
, unsigned /*msg*/);
1075 /* --- @p_txend@ --- *
1077 * Arguments: @peer *p@ = pointer to peer block
1081 * Use: Sends a packet to the peer.
1084 extern void p_txend(peer */
*p*/
);
1086 /* --- @p_pingsend@ --- *
1088 * Arguments: @peer *p@ = destination peer
1089 * @ping *pg@ = structure to fill in
1090 * @unsigned type@ = message type
1091 * @unsigned long timeout@ = how long to wait before giving up
1092 * @void (*func)(int, void *)@ = callback function
1093 * @void *arg@ = argument for callback
1095 * Returns: Zero if successful, nonzero if it failed.
1097 * Use: Sends a ping to a peer. Call @func@ with a nonzero argument
1098 * if we get an answer within the timeout, or zero if no answer.
1101 extern int p_pingsend(peer */
*p*/
, ping */
*pg*/
, unsigned /*type*/,
1102 unsigned long /*timeout*/,
1103 void (*/
*func*/
)(int, void *), void */
*arg*/
);
1105 /* --- @p_pingdone@ --- *
1107 * Arguments: @ping *p@ = ping structure
1108 * @int rc@ = return code to pass on
1112 * Use: Disposes of a ping structure, maybe sending a notification.
1115 extern void p_pingdone(ping */
*p*/
, int /*rc*/);
1117 /* --- @p_greet@ --- *
1119 * Arguments: @peer *p@ = peer to send to
1120 * @const void *c@ = pointer to challenge
1121 * @size_t sz@ = size of challenge
1125 * Use: Sends a greeting packet.
1128 extern void p_greet(peer */
*p*/
, const void */
*c*/
, size_t /*sz*/);
1130 /* --- @p_tun@ --- *
1132 * Arguments: @peer *p@ = pointer to peer block
1133 * @buf *b@ = buffer containing incoming packet
1137 * Use: Handles a packet which needs to be sent to a peer.
1140 extern void p_tun(peer */
*p*/
, buf */
*b*/
);
1142 /* --- @p_keyreload@ --- *
1148 * Use: Forces a check of the daemon's keyring files.
1151 extern void p_keyreload(void);
1153 /* --- @p_interval@ --- *
1159 * Use: Called periodically to do tidying.
1162 extern void p_interval(void);
1164 /* --- @p_stats@ --- *
1166 * Arguments: @peer *p@ = pointer to a peer block
1168 * Returns: A pointer to the peer's statistics.
1171 extern stats
*p_stats(peer */
*p*/
);
1173 /* --- @p_ifname@ --- *
1175 * Arguments: @peer *p@ = pointer to a peer block
1177 * Returns: A pointer to the peer's interface name.
1180 extern const char *p_ifname(peer */
*p*/
);
1182 /* --- @p_setifname@ --- *
1184 * Arguments: @peer *p@ = pointer to a peer block
1185 * @const char *name@ = pointer to the new name
1189 * Use: Changes the name held for a peer's interface.
1192 extern void p_setifname(peer */
*p*/
, const char */
*name*/
);
1194 /* --- @p_addr@ --- *
1196 * Arguments: @peer *p@ = pointer to a peer block
1198 * Returns: A pointer to the peer's address.
1201 extern const addr
*p_addr(peer */
*p*/
);
1203 /* --- @p_init@ --- *
1205 * Arguments: @struct in_addr addr@ = address to bind to
1206 * @unsigned port@ = port number to listen to
1210 * Use: Initializes the peer system; creates the socket.
1213 extern void p_init(struct in_addr
/*addr*/, unsigned /*port*/);
1215 /* --- @p_port@ --- *
1219 * Returns: Port number used for socket.
1222 unsigned p_port(void);
1224 /* --- @p_create@ --- *
1226 * Arguments: @peerspec *spec@ = information about this peer
1228 * Returns: Pointer to the peer block, or null if it failed.
1230 * Use: Creates a new named peer block. No peer is actually attached
1234 extern peer
*p_create(peerspec */
*spec*/
);
1236 /* --- @p_name@ --- *
1238 * Arguments: @peer *p@ = pointer to a peer block
1240 * Returns: A pointer to the peer's name.
1242 * Use: Equivalent to @p_spec(p)->name@.
1245 extern const char *p_name(peer */
*p*/
);
1247 /* --- @p_tag@ --- *
1249 * Arguments: @peer *p@ = pointer to a peer block
1251 * Returns: A pointer to the peer's public key tag.
1254 extern const char *p_tag(peer */
*p*/
);
1256 /* --- @p_spec@ --- *
1258 * Arguments: @peer *p@ = pointer to a peer block
1260 * Returns: Pointer to the peer's specification
1263 extern const peerspec
*p_spec(peer */
*p*/
);
1265 /* --- @p_findbyaddr@ --- *
1267 * Arguments: @const addr *a@ = address to look up
1269 * Returns: Pointer to the peer block, or null if not found.
1271 * Use: Finds a peer by address.
1274 extern peer
*p_findbyaddr(const addr */
*a*/
);
1276 /* --- @p_find@ --- *
1278 * Arguments: @const char *name@ = name to look up
1280 * Returns: Pointer to the peer block, or null if not found.
1282 * Use: Finds a peer by name.
1285 extern peer
*p_find(const char */
*name*/
);
1287 /* --- @p_destroy@ --- *
1289 * Arguments: @peer *p@ = pointer to a peer
1293 * Use: Destroys a peer.
1296 extern void p_destroy(peer */
*p*/
);
1298 /* --- @FOREACH_PEER@ --- *
1300 * Arguments: @p@ = name to bind to each peer
1301 * @stuff@ = thing to do for each item
1303 * Use: Does something for each current peer.
1306 #define FOREACH_PEER(p, stuff) do { \
1309 for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) do stuff while (0); \
1312 /* --- @p_mkiter@ --- *
1314 * Arguments: @peer_iter *i@ = pointer to an iterator
1318 * Use: Initializes the iterator.
1321 extern void p_mkiter(peer_iter */
*i*/
);
1323 /* --- @p_next@ --- *
1325 * Arguments: @peer_iter *i@ = pointer to an iterator
1327 * Returns: Next peer, or null if at the end.
1329 * Use: Returns the next peer.
1332 extern peer
*p_next(peer_iter */
*i*/
);
1334 /*----- Tunnel drivers ----------------------------------------------------*/
1337 extern const tunnel_ops tun_linux
;
1341 extern const tunnel_ops tun_unet
;
1345 extern const tunnel_ops tun_bsd
;
1348 extern const tunnel_ops tun_slip
;
1350 /*----- Other handy utilities ---------------------------------------------*/
1352 /* --- @mpstr@ --- *
1354 * Arguments: @mp *m@ = a multiprecision integer
1356 * Returns: A pointer to the integer's textual representation.
1358 * Use: Converts a multiprecision integer to a string. Corrupts
1362 extern const char *mpstr(mp */
*m*/
);
1364 /* --- @gestr@ --- *
1366 * Arguments: @group *g@ = a group
1367 * @ge *x@ = a group element
1369 * Returns: A pointer to the element's textual representation.
1371 * Use: Converts a group element to a string. Corrupts
1375 extern const char *gestr(group */
*g*/
, ge */
*x*/
);
1377 /* --- @timestr@ --- *
1379 * Arguments: @time_t t@ = a time to convert
1381 * Returns: A pointer to a textual representation of the time.
1383 * Use: Converts a time to a textual representation. Corrupts
1387 extern const char *timestr(time_t /*t*/);
1389 /* --- @mystrieq@ --- *
1391 * Arguments: @const char *x, *y@ = two strings
1393 * Returns: True if @x@ and @y are equal, up to case.
1396 extern int mystrieq(const char */
*x*/
, const char */
*y*/
);
1398 /* --- @seq_reset@ --- *
1400 * Arguments: @seqwin *s@ = sequence-checking window
1404 * Use: Resets a sequence number window.
1407 extern void seq_reset(seqwin */
*s*/
);
1409 /* --- @seq_check@ --- *
1411 * Arguments: @seqwin *s@ = sequence-checking window
1412 * @uint32 q@ = sequence number to check
1413 * @const char *service@ = service to report message from
1415 * Returns: A @SEQ_@ code.
1417 * Use: Checks a sequence number against the window, updating things
1421 extern int seq_check(seqwin */
*s*/
, uint32
/*q*/, const char */
*service*/
);
1423 /*----- That's all, folks -------------------------------------------------*/