3 * $Id: mallory.c,v 1.2 2003/10/15 09:31:06 mdw Exp $
5 * An evil proxy for TrIPE
7 * (c) 2001 Straylight/Edgeware
10 /*----- Licensing notice --------------------------------------------------*
12 * This file is part of Trivial IP Encryption (TrIPE).
14 * TrIPE is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License as published by
16 * the Free Software Foundation; either version 2 of the License, or
17 * (at your option) any later version.
19 * TrIPE is distributed in the hope that it will be useful,
20 * but WITHOUT ANY WARRANTY; without even the implied warranty of
21 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
22 * GNU General Public License for more details.
24 * You should have received a copy of the GNU General Public License
25 * along with TrIPE; if not, write to the Free Software Foundation,
26 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
29 /*----- Revision history --------------------------------------------------*
32 * Revision 1.2 2003/10/15 09:31:06 mdw
33 * Make forking work properly.
35 * Revision 1.1 2001/06/19 22:11:14 mdw
36 * The beginnings of a malicious proxy for TrIPE.
40 /*----- Header files ------------------------------------------------------*/
51 #include <sys/types.h>
56 #include <sys/socket.h>
57 #include <netinet/in.h>
58 #include <arpa/inet.h>
61 #include <mLib/alloc.h>
62 #include <mLib/dstr.h>
63 #include <mLib/fdflags.h>
64 #include <mLib/mdwopt.h>
65 #include <mLib/quis.h>
66 #include <mLib/report.h>
71 #include <catacomb/buf.h>
73 #include <catacomb/key.h>
75 #include <catacomb/mp.h>
76 #include <catacomb/mpmont.h>
77 #include <catacomb/mprand.h>
78 #include <catacomb/dh.h>
80 #include <catacomb/noise.h>
81 #include <catacomb/rand.h>
82 #include <catacomb/rc4.h>
85 /*----- Data structures ---------------------------------------------------*/
94 typedef struct filter {
97 void (*func)(struct filter */*f*/, const octet */*buf*/, size_t /*sz*/);
101 typedef struct qnode {
106 /*----- Static variables --------------------------------------------------*/
108 #define PKBUFSZ 65536
110 static sel_state sel;
111 static peer peers[2];
112 static unsigned npeer = 0;
113 static key_file keys;
116 #define PASS(f, buf, sz) ((f) ? (f)->func((f), (buf), (sz)) : (void)0)
117 #define RND(i) (rng->ops->range(rng, (i)))
119 /*----- Peer management ---------------------------------------------------*/
121 static void dopacket(int fd, unsigned mode, void *vv)
125 int r = read(fd, buf, sizeof(buf));
127 printf("recv from `%s'\n", p->name);
132 static void addpeer(unsigned ac, char **av)
134 key_packstruct kps[DH_PUBFETCHSZ];
137 struct sockaddr_in sin;
144 die(1, "syntax: peer:NAME:PORT:ADDR:PORT");
146 die(1, "enough peers already");
148 p->name = xstrdup(av[0]);
149 kp = key_fetchinit(dh_pubfetch, kps, &p->kpub);
150 e = key_fetchbyname(kp, &keys, av[0]);
153 die(1, "key_fetch `%s': %s", av[0], key_strerror(e));
154 if ((fd = socket(PF_INET, SOCK_DGRAM, 0)) < 0)
155 die(1, "socket: %s", strerror(errno));
156 fdflags(fd, O_NONBLOCK, O_NONBLOCK, FD_CLOEXEC, FD_CLOEXEC);
157 memset(&sin, 0, sizeof(sin));
158 sin.sin_family = AF_INET;
159 sin.sin_addr.s_addr = INADDR_ANY;
160 sin.sin_port = htons(atoi(av[1]));
161 if (bind(fd, (struct sockaddr *)&sin, sizeof(sin)))
162 die(1, "bind: %s", strerror(errno));
163 memset(&sin, 0, sizeof(sin));
164 sin.sin_family = AF_INET;
165 if ((h = gethostbyname(av[2])) == 0)
166 die(1, "gethostbyname `%s'", av[2]);
167 if (setsockopt(fd, SOL_SOCKET, SO_RCVBUF, &len, sizeof(len)) ||
168 setsockopt(fd, SOL_SOCKET, SO_SNDBUF, &len, sizeof(len)))
169 die(1, "setsockopt: %s", strerror(errno));
170 memcpy(&sin.sin_addr, h->h_addr, sizeof(sin.sin_addr));
171 sin.sin_port = htons(atoi(av[3]));
172 if (connect(fd, (struct sockaddr *)&sin, sizeof(sin)))
173 die(1, "connect: %s", strerror(errno));
174 sel_initfile(&sel, &p->sf, fd, SEL_READ, dopacket, p);
178 /*----- Fork filter -------------------------------------------------------*/
180 typedef struct forknode {
181 struct forknode *next;
185 typedef struct forkfilt {
190 static void dofork(filter *f, const octet *buf, size_t sz)
192 forkfilt *ff = f->state;
197 for (fn = ff->fn; fn; fn = fn->next) {
198 printf("fork branch %u of fork `%s'\n", i++, ff->name);
199 PASS(fn->f, buf, sz);
201 printf("fork branch %u of fork `%s'\n", i++, ff->name);
202 PASS(f->next, buf, sz);
205 static void addfork(filter *f, unsigned ac, char **av)
209 die(1, "syntax: filt:fork:NAME");
210 ff = CREATE(forkfilt);
211 ff->name = xstrdup(av[0]);
217 static void nextfork(unsigned ac, char **av)
226 die(1, "syntax: next:NAME:...");
227 for (i = 0; i < 2; i++) {
229 for (f = p->f; f; f = f->next) {
230 if (f->func != dofork)
233 for (j = 0; j < ac; j++) {
234 if (strcmp(av[j], ff->name) == 0)
239 fn = CREATE(forknode);
240 for (ffn = &ff->fn; *ffn; ffn = &(*ffn)->next)
250 /*----- Corrupt filter ----------------------------------------------------*/
252 typedef struct corrupt {
256 static void docorrupt(filter *f, const octet *buf, size_t sz)
258 corrupt *c = f->state;
262 while (!RND(c->p_corrupt)) {
263 puts("corrupt packet");
264 b[RND(sz)] ^= RND(256);
266 PASS(f->next, b, sz);
269 static void addcorrupt(filter *f, unsigned ac, char **av)
273 die(1, "syntax: filt:corrupt[:PCORRUPT]");
276 c->p_corrupt = atoi(av[0]);
283 /*----- Delay filter ------------------------------------------------------*/
285 typedef struct delaynode {
295 typedef struct delay {
303 static void dtimer(struct timeval *tv, void *vv);
305 static void dinsert(delaynode *dn)
309 unsigned long tdelta = RND(dn->d->t);
310 gettimeofday(&tv, 0);
311 TV_ADDL(&tv, &tv, 0, tdelta);
313 sel_addtimer(&sel, &dn->tm, &tv, dtimer, dn);
315 for (ta = tb = sel.timers; ta; ta = ta->next) {
316 ta = ta->next; if (!ta) break; assert(ta != tb);
317 ta = ta->next; if (!ta) break; assert(ta != tb);
320 printf(" delay %lu usecs", tdelta);
323 static void dsend(delaynode *dn, unsigned force)
327 fputs(" send...\n", stdout);
329 PASS(d->f->next, dn->buf, dn->sz);
330 fputs("delay ...", stdout);
339 sel_rmtimer(&ddn->tm);
340 sel_addtimer(&sel, &dn->tm, &ddn->tm.tv, dtimer, dn);
347 printf(" move id %u from slot %u to slot %u", ddn->seq, ddn->i, dn->i);
349 { unsigned i; for (i = 0; i < d->n; i++) assert(d->q[i].buf); }
350 fputs(" remove", stdout);
354 static void dtimer(struct timeval *tv, void *vv)
357 printf("delay timer peer `%s' id %u slot %u",
358 dn->d->f->p_from->name, dn->seq, dn->i);
360 dsend(dn, RND(dn->d->p_replay));
364 static void dodelay(filter *f, const octet *buf, size_t sz)
368 static unsigned seq = 0;
370 fputs("delay", stdout);
371 if (d->n == d->max) {
372 dn = &d->q[RND(d->n)];
373 printf(" force uid %u", dn->seq);
374 sel_rmtimer(&dn->tm);
381 printf(" new id %u in slot %u", dn->seq, dn->i);
382 dn->buf = xmalloc(sz);
384 memcpy(dn->buf, buf, sz);
389 static void adddelay(filter *f, unsigned ac, char **av)
394 if (ac < 1 || ac > 3)
395 die(1, "syntax: filt:delay:QLEN[:MILLIS:PREPLAY]");
397 d->max = atoi(av[0]);
399 d->t = strtoul(av[1], 0, 10);
404 d->p_replay = atoi(av[2]);
408 d->q = xmalloc(d->max * sizeof(delaynode));
412 for (i = 0; i < d->max; i++) {
420 /*----- Filters -----------------------------------------------------------*/
422 static void dosend(filter *f, const octet *buf, size_t sz)
424 printf("send to `%s'\n", f->p_to->name);
425 write(f->p_to->sf.fd, buf, sz);
428 static void addsend(filter *f, unsigned ac, char **av)
431 die(1, "syntax: filt:send");
435 const struct filtab {
437 void (*func)(filter */*f*/, unsigned /*ac*/, char **/*av*/);
441 { "delay", adddelay },
442 { "corrupt", addcorrupt },
446 static void dofilter(peer *from, peer *to, unsigned ac, char **av)
448 filter **ff, *f = CREATE(filter);
449 const struct filtab *ft;
451 die(1, "syntax: {l,r,}filt:NAME:...");
456 for (ff = &from->f; *ff; ff = &(*ff)->next)
459 for (ft = filtab; ft->name; ft++) {
460 if (strcmp(av[0], ft->name) == 0) {
461 ft->func(f, ac - 1, av + 1);
465 die(1, "unknown filter `%s'", av[0]);
468 /*----- Flooding ----------------------------------------------------------*/
470 typedef struct flood {
478 static void setflood(flood *f);
480 static void floodtimer(struct timeval *tv, void *vv)
492 rng->ops->fill(rng, buf, sz);
495 puts("flood packet");
496 PASS(f->p->f, buf, sz);
500 static void setflood(flood *f)
503 gettimeofday(&tv, 0);
504 TV_ADDL(&tv, &tv, 0, RND(f->t));
505 sel_addtimer(&sel, &f->tm, &tv, floodtimer, f);
508 static void doflood(peer *p, unsigned ac, char **av)
512 die(1, "syntax: flood[:TYPE:MILLIS:SIZE]");
516 f->type = strtoul(av[0], 0, 16);
531 /*----- Configuration commands --------------------------------------------*/
533 static void parse(char *p);
535 static void addflood(unsigned ac, char **av) {
536 doflood(&peers[0], ac, av);
537 doflood(&peers[1], ac, av);
539 static void addlflood(unsigned ac, char **av) {
540 doflood(&peers[0], ac, av);
542 static void addrflood(unsigned ac, char **av) {
543 doflood(&peers[1], ac, av);
546 static void addfilter(unsigned ac, char **av) {
547 dofilter(&peers[0], &peers[1], ac, av);
548 dofilter(&peers[1], &peers[0], ac, av);
550 static void addlfilter(unsigned ac, char **av) {
551 dofilter(&peers[0], &peers[1], ac, av);
553 static void addrfilter(unsigned ac, char **av) {
554 dofilter(&peers[1], &peers[0], ac, av);
557 static void include(unsigned ac, char **av)
562 die(1, "syntax: include:FILE:...");
564 if ((fp = fopen(*av, "r")) == 0)
565 die(1, "fopen `%s': %s", *av, strerror(errno));
566 while (dstr_putline(&d, fp) != EOF) {
575 const struct cmdtab {
577 void (*func)(unsigned /*ac*/, char **/*av*/);
580 { "include", include },
581 { "filt", addfilter },
582 { "lfilt", addlfilter },
583 { "rfilt", addrfilter },
584 { "next", nextfork },
585 { "flood", addflood },
586 { "lflood", addlflood },
587 { "rflood", addrflood },
593 static void parse(char *p)
597 const struct cmdtab *ct;
605 } while (p && c < AVMAX - 1);
607 for (ct = cmdtab; ct->name; ct++) {
608 if (strcmp(ct->name, v[0]) == 0) {
609 ct->func(c - 1, v + 1);
613 die(1, "unknown command `%s'", v[0]);
616 /*----- Main driver -------------------------------------------------------*/
618 static void version(FILE *fp)
620 pquis(fp, "$, TrIPE version " VERSION "\n");
623 static void usage(FILE *fp)
625 pquis(fp, "Usage: $ [-k keyring] directive...\n");
628 static void help(FILE *fp)
635 int main(int argc, char *argv[])
637 const char *kfname = "keyring.pub";
646 static const struct option opt[] = {
647 { "help", 0, 0, 'h' },
648 { "version", 0, 0, 'v' },
649 { "usage", 0, 0, 'u' },
650 { "keyring", OPTF_ARGREQ, 0, 'k' },
653 if ((i = mdwopt(argc, argv, "hvuk:", opt, 0, 0, 0)) < 0)
677 rand_noisesrc(RAND_GLOBAL, &noise_source);
678 rand_seed(RAND_GLOBAL, 160);
679 rand_get(RAND_GLOBAL, buf, sizeof(buf));
680 rng = rc4_rand(buf, sizeof(buf));
682 if (key_open(&keys, kfname, KOPEN_READ, key_moan, 0))
683 die(1, "couldn't open `%s': %s", kfname, strerror(errno));
684 for (i = optind; i < argc; i++)
687 die(1, "need two peers");
694 /*----- That's all, folks -------------------------------------------------*/