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 *tag; /* Public key tag */
357 const tunnel_ops *tops; /* Tunnel operations */
358 unsigned long t_ka; /* Keep alive interval */
359 addr sa; /* Socket address to speak to */
360 size_t sasz; /* Socket address size */
361 unsigned f; /* Flags for the peer */
362 #define PSF_KXMASK 255u /* Key-exchange flags to set */
363 #define PSF_MOBILE 256u /* Address may change rapidly */
366 typedef struct peer_byname {
371 typedef struct peer_byaddr {
376 typedef struct peer {
377 peer_byname *byname; /* Lookup-by-name block */
378 peer_byaddr *byaddr; /* Lookup-by-address block */
379 struct ping *pings; /* Pings we're waiting for */
380 peerspec spec; /* Specifications for this peer */
381 tunnel *t; /* Tunnel for local packets */
382 char *ifname; /* Interface name for tunnel */
383 keyset *ks; /* List head for keysets */
384 buf b; /* Buffer for sending packets */
385 stats st; /* Statistics */
386 keyexch kx; /* Key exchange protocol block */
387 sel_timer tka; /* Timer for keepalives */
390 typedef struct peer_iter { sym_iter i; } peer_iter;
392 typedef struct ping {
393 struct ping *next, *prev; /* Links to next and previous */
394 peer *p; /* Peer so we can free it */
395 unsigned msg; /* Kind of response expected */
396 uint32 id; /* Id so we can recognize response */
397 octet magic[32]; /* Some random data */
398 sel_timer t; /* Timeout for ping */
399 void (*func)(int /*rc*/, void */*arg*/); /* Function to call when done */
400 void *arg; /* Argument for callback */
411 /* --- Admin structure --- */
413 #define OBUFSZ 16384u
415 typedef struct obuf {
416 struct obuf *next; /* Next buffer in list */
417 char *p_in, *p_out; /* Pointers into the buffer */
418 char buf[OBUFSZ]; /* The actual buffer */
421 typedef struct oqueue {
422 obuf *hd, *tl; /* Head and tail pointers */
427 typedef struct admin_bgop {
428 struct admin_bgop *next, *prev; /* Links to next and previous */
429 struct admin *a; /* Owner job */
430 char *tag; /* Tag string for messages */
431 void (*cancel)(struct admin_bgop *); /* Destructor function */
434 typedef struct admin_resop {
435 admin_bgop bg; /* Background operation header */
436 char *addr; /* Hostname to be resolved */
437 bres_client r; /* Background resolver task */
438 sel_timer t; /* Timer for resolver */
439 addr sa; /* Socket address */
440 size_t sasz; /* Socket address size */
441 void (*func)(struct admin_resop *, int); /* Handler */
444 enum { ARES_OK, ARES_FAIL };
446 typedef struct admin_addop {
447 admin_resop r; /* Name resolution header */
448 peerspec peer; /* Peer pending creation */
451 typedef struct admin_pingop {
452 admin_bgop bg; /* Background operation header */
453 ping ping; /* Ping pending response */
454 struct timeval pingtime; /* Time last ping was sent */
457 typedef struct admin_service {
458 sym_base _b; /* Hash table base structure */
459 char *version; /* The provided version */
460 struct admin *prov; /* Which client provides me */
461 struct admin_service *next, *prev; /* Client's list of services */
464 typedef struct admin_svcop {
465 admin_bgop bg; /* Background operation header */
466 struct admin *prov; /* Client servicing this job */
467 unsigned index; /* This job's index */
468 struct admin_svcop *next, *prev; /* Links for provider's jobs */
471 typedef struct admin_jobentry {
472 unsigned short seq; /* Zero if unused */
474 admin_svcop *op; /* Operation, if slot in use, ... */
475 uint32 next; /* ... or index of next free slot */
479 typedef struct admin_jobtable {
480 uint32 n, sz; /* Used slots and table size */
481 admin_svcop *active; /* List of active jobs */
482 uint32 free; /* Index of first free slot */
483 admin_jobentry *v; /* And the big array of entries */
486 typedef struct admin {
487 struct admin *next, *prev; /* Links to next and previous */
488 unsigned f; /* Various useful flags */
489 unsigned ref; /* Reference counter */
491 unsigned seq; /* Sequence number for tracing */
493 oqueue out; /* Output buffer list */
494 oqueue delay; /* Delayed output buffer list */
495 admin_bgop *bg; /* Backgrounded operations */
496 admin_service *svcs; /* Which services I provide */
497 admin_jobtable j; /* Table of outstanding jobs */
498 selbuf b; /* Line buffer for commands */
499 sel_file w; /* Selector for write buffering */
502 #define AF_DEAD 1u /* Destroy this admin block */
503 #define AF_CLOSE 2u /* Client closed connection */
504 #define AF_NOTE 4u /* Catch notifications */
505 #define AF_WARN 8u /* Catch warning messages */
507 #define AF_TRACE 16u /* Catch tracing */
509 #define AF_FOREGROUND 32u /* Quit server when client closes */
512 # define AF_ALLMSGS (AF_NOTE | AF_TRACE | AF_WARN)
514 # define AF_ALLMSGS (AF_NOTE | AF_WARN)
517 /*----- Global variables --------------------------------------------------*/
519 extern sel_state sel; /* Global I/O event state */
520 extern octet buf_i[PKBUFSZ], buf_o[PKBUFSZ], buf_t[PKBUFSZ], buf_u[PKBUFSZ];
521 extern const tunnel_ops *tunnels[]; /* Table of tunnels (0-term) */
522 extern const tunnel_ops *tun_default; /* Default tunnel to use */
523 extern kdata *master; /* Default private key */
524 extern const char *tag_priv; /* Default private key tag */
527 extern const trace_opt tr_opts[]; /* Trace options array */
528 extern unsigned tr_flags; /* Trace options flags */
531 /*----- Other macros ------------------------------------------------------*/
533 #define TIMER noise_timer(RAND_GLOBAL)
535 /*----- Key management ----------------------------------------------------*/
537 /* --- @km_init@ --- *
539 * Arguments: @const char *privkr@ = private keyring file
540 * @const char *pubkr@ = public keyring file
541 * @const char *ptag@ = default private-key tag
545 * Use: Initializes the key-management machinery, loading the
546 * keyrings and so on.
549 extern void km_init(const char */*privkr*/, const char */*pubkr*/,
550 const char */*ptag*/);
552 /* --- @km_reload@ --- *
556 * Returns: Zero if OK, nonzero to force reloading of keys.
558 * Use: Checks the keyrings to see if they need reloading.
561 extern int km_reload(void);
563 /* --- @km_findpub@, @km_findpriv@ --- *
565 * Arguments: @const char *tag@ = key tag to load
567 * Returns: Pointer to the kdata object if successful, or null on error.
569 * Use: Fetches a public or private key from the keyring.
572 extern kdata *km_findpub(const char */*tag*/);
573 extern kdata *km_findpriv(const char */*tag*/);
575 /* --- @km_samealgsp@ --- *
577 * Arguments: @const kdata *kdx, *kdy@ = two key data objects
579 * Returns: Nonzero if their two algorithm selections are the same.
581 * Use: Checks sameness of algorithm selections: used to ensure that
582 * peers are using sensible algorithms.
585 extern int km_samealgsp(const kdata */*kdx*/, const kdata */*kdy*/);
587 /* --- @km_ref@ --- *
589 * Arguments: @kdata *kd@ = pointer to the kdata object
593 * Use: Claim a new reference to a kdata object.
596 extern void km_ref(kdata */*kd*/);
598 /* --- @km_unref@ --- *
600 * Arguments: @kdata *kd@ = pointer to the kdata object
604 * Use: Releases a reference to a kdata object.
607 extern void km_unref(kdata */*kd*/);
609 /* --- @km_tag@ --- *
611 * Arguments: @kdata *kd@ - pointer to the kdata object
613 * Returns: A pointer to the short tag by which the kdata was loaded.
616 extern const char *km_tag(kdata */*kd*/);
618 /*----- Key exchange ------------------------------------------------------*/
620 /* --- @kx_start@ --- *
622 * Arguments: @keyexch *kx@ = pointer to key exchange context
623 * @int forcep@ = nonzero to ignore the quiet timer
627 * Use: Stimulates a key exchange. If a key exchage is in progress,
628 * a new challenge is sent (unless the quiet timer forbids
629 * this); if no exchange is in progress, one is commenced.
632 extern void kx_start(keyexch */*kx*/, int /*forcep*/);
634 /* --- @kx_message@ --- *
636 * Arguments: @keyexch *kx@ = pointer to key exchange context
637 * @unsigned msg@ = the message code
638 * @buf *b@ = pointer to buffer containing the packet
642 * Use: Reads a packet containing key exchange messages and handles
646 extern void kx_message(keyexch */*kx*/, unsigned /*msg*/, buf */*b*/);
648 /* --- @kx_free@ --- *
650 * Arguments: @keyexch *kx@ = pointer to key exchange context
654 * Use: Frees everything in a key exchange context.
657 extern void kx_free(keyexch */*kx*/);
659 /* --- @kx_newkeys@ --- *
661 * Arguments: @keyexch *kx@ = pointer to key exchange context
665 * Use: Informs the key exchange module that its keys may have
666 * changed. If fetching the new keys fails, the peer will be
667 * destroyed, we log messages and struggle along with the old
671 extern void kx_newkeys(keyexch */*kx*/);
673 /* --- @kx_init@ --- *
675 * Arguments: @keyexch *kx@ = pointer to key exchange context
676 * @peer *p@ = pointer to peer context
677 * @keyset **ks@ = pointer to keyset list
678 * @unsigned f@ = various useful flags
680 * Returns: Zero if OK, nonzero if it failed.
682 * Use: Initializes a key exchange module. The module currently
683 * contains no keys, and will attempt to initiate a key
687 extern int kx_init(keyexch */*kx*/, peer */*p*/,
688 keyset **/*ks*/, unsigned /*f*/);
690 /*----- Keysets and symmetric cryptography --------------------------------*/
692 /* --- @ks_drop@ --- *
694 * Arguments: @keyset *ks@ = pointer to a keyset
698 * Use: Decrements a keyset's reference counter. If the counter hits
699 * zero, the keyset is freed.
702 extern void ks_drop(keyset */*ks*/);
704 /* --- @ks_gen@ --- *
706 * Arguments: @const void *k@ = pointer to key material
707 * @size_t x, y, z@ = offsets into key material (see below)
708 * @peer *p@ = pointer to peer information
710 * Returns: A pointer to the new keyset.
712 * Use: Derives a new keyset from the given key material. The
713 * offsets @x@, @y@ and @z@ separate the key material into three
714 * parts. Between the @k@ and @k + x@ is `my' contribution to
715 * the key material; between @k + x@ and @k + y@ is `your'
716 * contribution; and between @k + y@ and @k + z@ is a shared
717 * value we made together. These are used to construct two
718 * pairs of symmetric keys. Each pair consists of an encryption
719 * key and a message authentication key. One pair is used for
720 * outgoing messages, the other for incoming messages.
722 * The new key is marked so that it won't be selected for output
723 * by @ksl_encrypt@. You can still encrypt data with it by
724 * calling @ks_encrypt@ directly.
727 extern keyset *ks_gen(const void */*k*/,
728 size_t /*x*/, size_t /*y*/, size_t /*z*/,
731 /* --- @ks_tregen@ --- *
733 * Arguments: @keyset *ks@ = pointer to a keyset
735 * Returns: The time at which moves ought to be made to replace this key.
738 extern time_t ks_tregen(keyset */*ks*/);
740 /* --- @ks_activate@ --- *
742 * Arguments: @keyset *ks@ = pointer to a keyset
746 * Use: Activates a keyset, so that it can be used for encrypting
750 extern void ks_activate(keyset */*ks*/);
752 /* --- @ks_encrypt@ --- *
754 * Arguments: @keyset *ks@ = pointer to a keyset
755 * @unsigned ty@ = message type
756 * @buf *b@ = pointer to input buffer
757 * @buf *bb@ = pointer to output buffer
759 * Returns: Zero if successful; @KSERR_REGEN@ if we should negotiate a
760 * new key; @KSERR_NOKEYS@ if the key is not usable. Also
761 * returns zero if there was insufficient buffer (but the output
762 * buffer is broken in this case).
764 * Use: Encrypts a block of data using the key. Note that the `key
765 * ought to be replaced' notification is only ever given once
766 * for each key. Also note that this call forces a keyset to be
767 * used even if it's marked as not for data output.
770 extern int ks_encrypt(keyset */*ks*/, unsigned /*ty*/,
771 buf */*b*/, buf */*bb*/);
773 /* --- @ks_decrypt@ --- *
775 * Arguments: @keyset *ks@ = pointer to a keyset
776 * @unsigned ty@ = expected type code
777 * @buf *b@ = pointer to an input buffer
778 * @buf *bb@ = pointer to an output buffer
780 * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
781 * zero if there was insufficient buffer (but the output buffer
782 * is broken in this case).
784 * Use: Attempts to decrypt a message using a given key. Note that
785 * requesting decryption with a key directly won't clear a
786 * marking that it's not for encryption.
789 extern int ks_decrypt(keyset */*ks*/, unsigned /*ty*/,
790 buf */*b*/, buf */*bb*/);
792 /* --- @ksl_free@ --- *
794 * Arguments: @keyset **ksroot@ = pointer to keyset list head
798 * Use: Frees (releases references to) all of the keys in a keyset.
801 extern void ksl_free(keyset **/*ksroot*/);
803 /* --- @ksl_link@ --- *
805 * Arguments: @keyset **ksroot@ = pointer to keyset list head
806 * @keyset *ks@ = pointer to a keyset
810 * Use: Links a keyset into a list. A keyset can only be on one list
811 * at a time. Bad things happen otherwise.
814 extern void ksl_link(keyset **/*ksroot*/, keyset */*ks*/);
816 /* --- @ksl_prune@ --- *
818 * Arguments: @keyset **ksroot@ = pointer to keyset list head
822 * Use: Prunes the keyset list by removing keys which mustn't be used
826 extern void ksl_prune(keyset **/*ksroot*/);
828 /* --- @ksl_encrypt@ --- *
830 * Arguments: @keyset **ksroot@ = pointer to keyset list head
831 * @unsigned ty@ = message type
832 * @buf *b@ = pointer to input buffer
833 * @buf *bb@ = pointer to output buffer
835 * Returns: Zero if successful; @KSERR_REGEN@ if it's time to negotiate a
836 * new key; @KSERR_NOKEYS@ if there are no suitable keys
837 * available. Also returns zero if there was insufficient
838 * buffer space (but the output buffer is broken in this case).
840 * Use: Encrypts a packet.
843 extern int ksl_encrypt(keyset **/*ksroot*/, unsigned /*ty*/,
844 buf */*b*/, buf */*bb*/);
846 /* --- @ksl_decrypt@ --- *
848 * Arguments: @keyset **ksroot@ = pointer to keyset list head
849 * @unsigned ty@ = expected type code
850 * @buf *b@ = pointer to input buffer
851 * @buf *bb@ = pointer to output buffer
853 * Returns: Zero on success; @KSERR_DECRYPT@ on failure. Also returns
854 * zero if there was insufficient buffer (but the output buffer
855 * is broken in this case).
857 * Use: Decrypts a packet.
860 extern int ksl_decrypt(keyset **/*ksroot*/, unsigned /*ty*/,
861 buf */*b*/, buf */*bb*/);
863 /*----- Challenges --------------------------------------------------------*/
867 * Arguments: @buf *b@ = where to put the challenge
869 * Returns: Zero if OK, nonzero on error.
871 * Use: Issues a new challenge.
874 extern int c_new(buf */*b*/);
876 /* --- @c_check@ --- *
878 * Arguments: @buf *b@ = where to find the challenge
880 * Returns: Zero if OK, nonzero if it didn't work.
882 * Use: Checks a challenge. On failure, the buffer is broken.
885 extern int c_check(buf */*b*/);
887 /*----- Administration interface ------------------------------------------*/
889 #define A_END ((char *)0)
891 /* --- @a_vformat@ --- *
893 * Arguments: @dstr *d@ = where to leave the formatted message
894 * @const char *fmt@ = pointer to format string
895 * @va_list ap@ = arguments in list
899 * Use: Main message token formatting driver. The arguments are
900 * interleaved formatting tokens and their parameters, finally
901 * terminated by an entry @A_END@.
905 * * "*..." ... -- pretokenized @dstr_putf@-like string
907 * * "?ADDR" SOCKADDR -- a socket address, to be converted
909 * * "?B64" BUFFER SIZE -- binary data to be base64-encoded
911 * * "?TOKENS" VECTOR -- null-terminated vector of tokens
913 * * "?PEER" PEER -- peer's name
915 * * "?ERRNO" ERRNO -- system error code
917 * * "[!]..." ... -- @dstr_putf@-like string as single token
920 extern void a_vformat(dstr */*d*/, const char */*fmt*/, va_list /*ap*/);
922 /* --- @a_format@ --- *
924 * Arguments: @dstr *d@ = where to leave the formatted message
925 * @const char *fmt@ = pointer to format string
929 * Use: Writes a tokenized message into a string, for later
933 extern void a_format(dstr */*d*/, const char */*fmt*/, ...);
935 /* --- @a_warn@ --- *
937 * Arguments: @const char *fmt@ = pointer to format string
938 * @...@ = other arguments
942 * Use: Informs all admin connections of a warning.
945 extern void a_warn(const char */*fmt*/, ...);
947 /* --- @a_notify@ --- *
949 * Arguments: @const char *fmt@ = pointer to format string
950 * @...@ = other arguments
954 * Use: Sends a notification to interested admin connections.
957 extern void a_notify(const char */*fmt*/, ...);
959 /* --- @a_create@ --- *
961 * Arguments: @int fd_in, fd_out@ = file descriptors to use
962 * @unsigned f@ = initial flags to set
966 * Use: Creates a new admin connection.
969 extern void a_create(int /*fd_in*/, int /*fd_out*/, unsigned /*f*/);
971 /* --- @a_quit@ --- *
977 * Use: Shuts things down nicely.
980 extern void a_quit(void);
982 /* --- @a_preselect@ --- *
988 * Use: Informs the admin module that we're about to select again,
989 * and that it should do cleanup things it has delayed until a
993 extern void a_preselect(void);
995 /* --- @a_daemon@ --- *
1001 * Use: Informs the admin module that it's a daemon.
1004 extern void a_daemon(void);
1006 /* --- @a_init@ --- *
1008 * Arguments: @const char *sock@ = socket name to create
1009 * @uid_t u@ = user to own the socket
1010 * @gid_t g@ = group to own the socket
1011 * @mode_t m@ = permissions to set on the socket
1015 * Use: Creates the admin listening socket.
1018 extern void a_init(const char */*sock*/,
1019 uid_t /*u*/, gid_t /*g*/, mode_t /*m*/);
1021 /*----- Mapping with addresses as keys ------------------------------------*/
1023 /* --- @am_create@ --- *
1025 * Arguments: @addrmap *m@ = pointer to map
1029 * Use: Create an address map, properly set up.
1032 extern void am_create(addrmap */*m*/);
1034 /* --- @am_destroy@ --- *
1036 * Arguments: @addrmap *m@ = pointer to map
1040 * Use: Destroy an address map, throwing away all the entries.
1043 extern void am_destroy(addrmap */*m*/);
1045 /* --- @am_find@ --- *
1047 * Arguments: @addrmap *m@ = pointer to map
1048 * @const addr *a@ = address to look up
1049 * @size_t sz@ = size of block to allocate
1050 * @unsigned *f@ = where to store flags
1052 * Returns: Pointer to found item, or null.
1054 * Use: Finds a record with the given IP address, set @*f@ nonzero
1055 * and returns it. If @sz@ is zero, and no match was found,
1056 * return null; otherwise allocate a new block of @sz@ bytes,
1057 * clear @*f@ to zero and return the block pointer.
1060 extern void *am_find(addrmap */*m*/, const addr */*a*/,
1061 size_t /*sz*/, unsigned */*f*/);
1063 /* --- @am_remove@ --- *
1065 * Arguments: @addrmap *m@ = pointer to map
1066 * @void *i@ = pointer to the item
1070 * Use: Removes an item from the map.
1073 extern void am_remove(addrmap */*m*/, void */*i*/);
1075 /*----- Privilege separation ----------------------------------------------*/
1077 /* --- @ps_trace@ --- *
1079 * Arguments: @unsigned mask@ = trace mask to check
1080 * @const char *fmt@ = message format
1081 * @...@ = values for placeholders
1085 * Use: Writes a trace message.
1088 T( extern void ps_trace(unsigned /*mask*/, const char */*fmt*/, ...); )
1090 /* --- @ps_warn@ --- *
1092 * Arguments: @const char *fmt@ = message format
1093 * @...@ = values for placeholders
1097 * Use: Writes a warning message.
1100 extern void ps_warn(const char */*fmt*/, ...);
1102 /* --- @ps_tunfd@ --- *
1104 * Arguments: @const tunnel_ops *tops@ = pointer to tunnel operations
1105 * @char **ifn@ = where to put the interface name
1107 * Returns: The file descriptor, or @-1@ on error.
1109 * Use: Fetches a file descriptor for a tunnel driver.
1112 extern int ps_tunfd(const tunnel_ops */*tops*/, char **/*ifn*/);
1114 /* --- @ps_split@ --- *
1116 * Arguments: @int detachp@ = whether to detach the child from its terminal
1120 * Use: Separates off the privileged tunnel-opening service from the
1121 * rest of the server.
1124 extern void ps_split(int /*detachp*/);
1126 /* --- @ps_quit@ --- *
1132 * Use: Detaches from the helper process.
1135 extern void ps_quit(void);
1137 /*----- Peer management ---------------------------------------------------*/
1139 /* --- @p_txstart@ --- *
1141 * Arguments: @peer *p@ = pointer to peer block
1142 * @unsigned msg@ = message type code
1144 * Returns: A pointer to a buffer to write to.
1146 * Use: Starts sending to a peer. Only one send can happen at a
1150 extern buf *p_txstart(peer */*p*/, unsigned /*msg*/);
1152 /* --- @p_txend@ --- *
1154 * Arguments: @peer *p@ = pointer to peer block
1158 * Use: Sends a packet to the peer.
1161 extern void p_txend(peer */*p*/);
1163 /* --- @p_pingsend@ --- *
1165 * Arguments: @peer *p@ = destination peer
1166 * @ping *pg@ = structure to fill in
1167 * @unsigned type@ = message type
1168 * @unsigned long timeout@ = how long to wait before giving up
1169 * @void (*func)(int, void *)@ = callback function
1170 * @void *arg@ = argument for callback
1172 * Returns: Zero if successful, nonzero if it failed.
1174 * Use: Sends a ping to a peer. Call @func@ with a nonzero argument
1175 * if we get an answer within the timeout, or zero if no answer.
1178 extern int p_pingsend(peer */*p*/, ping */*pg*/, unsigned /*type*/,
1179 unsigned long /*timeout*/,
1180 void (*/*func*/)(int, void *), void */*arg*/);
1182 /* --- @p_pingdone@ --- *
1184 * Arguments: @ping *p@ = ping structure
1185 * @int rc@ = return code to pass on
1189 * Use: Disposes of a ping structure, maybe sending a notification.
1192 extern void p_pingdone(ping */*p*/, int /*rc*/);
1194 /* --- @p_greet@ --- *
1196 * Arguments: @peer *p@ = peer to send to
1197 * @const void *c@ = pointer to challenge
1198 * @size_t sz@ = size of challenge
1202 * Use: Sends a greeting packet.
1205 extern void p_greet(peer */*p*/, const void */*c*/, size_t /*sz*/);
1207 /* --- @p_tun@ --- *
1209 * Arguments: @peer *p@ = pointer to peer block
1210 * @buf *b@ = buffer containing incoming packet
1214 * Use: Handles a packet which needs to be sent to a peer.
1217 extern void p_tun(peer */*p*/, buf */*b*/);
1219 /* --- @p_keyreload@ --- *
1225 * Use: Forces a check of the daemon's keyring files.
1228 extern void p_keyreload(void);
1230 /* --- @p_interval@ --- *
1236 * Use: Called periodically to do tidying.
1239 extern void p_interval(void);
1241 /* --- @p_stats@ --- *
1243 * Arguments: @peer *p@ = pointer to a peer block
1245 * Returns: A pointer to the peer's statistics.
1248 extern stats *p_stats(peer */*p*/);
1250 /* --- @p_ifname@ --- *
1252 * Arguments: @peer *p@ = pointer to a peer block
1254 * Returns: A pointer to the peer's interface name.
1257 extern const char *p_ifname(peer */*p*/);
1259 /* --- @p_setifname@ --- *
1261 * Arguments: @peer *p@ = pointer to a peer block
1262 * @const char *name@ = pointer to the new name
1266 * Use: Changes the name held for a peer's interface.
1269 extern void p_setifname(peer */*p*/, const char */*name*/);
1271 /* --- @p_addr@ --- *
1273 * Arguments: @peer *p@ = pointer to a peer block
1275 * Returns: A pointer to the peer's address.
1278 extern const addr *p_addr(peer */*p*/);
1280 /* --- @p_init@ --- *
1282 * Arguments: @struct in_addr addr@ = address to bind to
1283 * @unsigned port@ = port number to listen to
1287 * Use: Initializes the peer system; creates the socket.
1290 extern void p_init(struct in_addr /*addr*/, unsigned /*port*/);
1292 /* --- @p_port@ --- *
1296 * Returns: Port number used for socket.
1299 unsigned p_port(void);
1301 /* --- @p_create@ --- *
1303 * Arguments: @peerspec *spec@ = information about this peer
1305 * Returns: Pointer to the peer block, or null if it failed.
1307 * Use: Creates a new named peer block. No peer is actually attached
1311 extern peer *p_create(peerspec */*spec*/);
1313 /* --- @p_name@ --- *
1315 * Arguments: @peer *p@ = pointer to a peer block
1317 * Returns: A pointer to the peer's name.
1319 * Use: Equivalent to @p_spec(p)->name@.
1322 extern const char *p_name(peer */*p*/);
1324 /* --- @p_tag@ --- *
1326 * Arguments: @peer *p@ = pointer to a peer block
1328 * Returns: A pointer to the peer's public key tag.
1331 extern const char *p_tag(peer */*p*/);
1333 /* --- @p_spec@ --- *
1335 * Arguments: @peer *p@ = pointer to a peer block
1337 * Returns: Pointer to the peer's specification
1340 extern const peerspec *p_spec(peer */*p*/);
1342 /* --- @p_findbyaddr@ --- *
1344 * Arguments: @const addr *a@ = address to look up
1346 * Returns: Pointer to the peer block, or null if not found.
1348 * Use: Finds a peer by address.
1351 extern peer *p_findbyaddr(const addr */*a*/);
1353 /* --- @p_find@ --- *
1355 * Arguments: @const char *name@ = name to look up
1357 * Returns: Pointer to the peer block, or null if not found.
1359 * Use: Finds a peer by name.
1362 extern peer *p_find(const char */*name*/);
1364 /* --- @p_destroy@ --- *
1366 * Arguments: @peer *p@ = pointer to a peer
1370 * Use: Destroys a peer.
1373 extern void p_destroy(peer */*p*/);
1375 /* --- @FOREACH_PEER@ --- *
1377 * Arguments: @p@ = name to bind to each peer
1378 * @stuff@ = thing to do for each item
1380 * Use: Does something for each current peer.
1383 #define FOREACH_PEER(p, stuff) do { \
1386 for (p_mkiter(&i_); (p = p_next(&i_)) != 0; ) stuff \
1389 /* --- @p_mkiter@ --- *
1391 * Arguments: @peer_iter *i@ = pointer to an iterator
1395 * Use: Initializes the iterator.
1398 extern void p_mkiter(peer_iter */*i*/);
1400 /* --- @p_next@ --- *
1402 * Arguments: @peer_iter *i@ = pointer to an iterator
1404 * Returns: Next peer, or null if at the end.
1406 * Use: Returns the next peer.
1409 extern peer *p_next(peer_iter */*i*/);
1411 /*----- Tunnel drivers ----------------------------------------------------*/
1414 extern const tunnel_ops tun_linux;
1418 extern const tunnel_ops tun_unet;
1422 extern const tunnel_ops tun_bsd;
1425 extern const tunnel_ops tun_slip;
1427 /*----- Other handy utilities ---------------------------------------------*/
1429 /* --- @mpstr@ --- *
1431 * Arguments: @mp *m@ = a multiprecision integer
1433 * Returns: A pointer to the integer's textual representation.
1435 * Use: Converts a multiprecision integer to a string. Corrupts
1439 extern const char *mpstr(mp */*m*/);
1441 /* --- @gestr@ --- *
1443 * Arguments: @group *g@ = a group
1444 * @ge *x@ = a group element
1446 * Returns: A pointer to the element's textual representation.
1448 * Use: Converts a group element to a string. Corrupts
1452 extern const char *gestr(group */*g*/, ge */*x*/);
1454 /* --- @timestr@ --- *
1456 * Arguments: @time_t t@ = a time to convert
1458 * Returns: A pointer to a textual representation of the time.
1460 * Use: Converts a time to a textual representation. Corrupts
1464 extern const char *timestr(time_t /*t*/);
1466 /* --- @mystrieq@ --- *
1468 * Arguments: @const char *x, *y@ = two strings
1470 * Returns: True if @x@ and @y are equal, up to case.
1473 extern int mystrieq(const char */*x*/, const char */*y*/);
1475 /* --- @seq_reset@ --- *
1477 * Arguments: @seqwin *s@ = sequence-checking window
1481 * Use: Resets a sequence number window.
1484 extern void seq_reset(seqwin */*s*/);
1486 /* --- @seq_check@ --- *
1488 * Arguments: @seqwin *s@ = sequence-checking window
1489 * @uint32 q@ = sequence number to check
1490 * @const char *service@ = service to report message from
1492 * Returns: A @SEQ_@ code.
1494 * Use: Checks a sequence number against the window, updating things
1498 extern int seq_check(seqwin */*s*/, uint32 /*q*/, const char */*service*/);
1500 /*----- That's all, folks -------------------------------------------------*/