1 #if defined(NO_BUFFER) || defined(NO_IP) || defined(NO_OPENSSL)
2 #error "Badness, NO_BUFFER, NO_IP or NO_OPENSSL is defined, turn them *off*"
5 /* Include our bits'n'pieces */
9 /********************************************/
10 /* Our local types that specify our "world" */
11 /********************************************/
13 /* These represent running "tunnels". Eg. if you wanted to do SSL in a
14 * "message-passing" scanario, the "int" file-descriptors might be replaced by
15 * thread or process IDs, and the "select" code might be replaced by message
16 * handling code. Whatever. */
17 typedef struct _tunala_item_t {
18 /* The underlying SSL state machine. This is a data-only processing unit
19 * and we communicate with it by talking to its four "buffers". */
21 /* The file-descriptors for the "dirty" (encrypted) side of the SSL
22 * setup. In actuality, this is typically a socket and both values are
24 int dirty_read, dirty_send;
25 /* The file-descriptors for the "clean" (unencrypted) side of the SSL
26 * setup. These could be stdin/stdout, a socket (both values the same),
27 * or whatever you like. */
28 int clean_read, clean_send;
31 /* This structure is used as the data for running the main loop. Namely, in a
32 * network format such as this, it is stuff for select() - but as pointed out,
33 * when moving the real-world to somewhere else, this might be replaced by
34 * something entirely different. It's basically the stuff that controls when
35 * it's time to do some "work". */
36 typedef struct _select_sets_t {
37 int max; /* As required as the first argument to select() */
38 fd_set reads, sends, excepts; /* As passed to select() */
40 typedef struct _tunala_selector_t {
41 select_sets_t last_selected; /* Results of the last select() */
42 select_sets_t next_select; /* What we'll next select on */
45 /* This structure is *everything*. We do it to avoid the use of globals so that,
46 * for example, it would be easier to shift things around between async-IO,
47 * thread-based, or multi-fork()ed (or combinations thereof). */
48 typedef struct _tunala_world_t {
49 /* The file-descriptor we "listen" on for new connections */
51 /* The array of tunnels */
52 tunala_item_t *tunnels;
53 /* the number of tunnels in use and allocated, respectively */
54 unsigned int tunnels_used, tunnels_size;
55 /* Our outside "loop" context stuff */
56 tunala_selector_t selector;
57 /* Our SSL_CTX, which is configured as the SSL client or server and has
58 * the various cert-settings and callbacks configured. */
60 /* Simple flag with complex logic :-) Indicates whether we're an SSL
61 * server or an SSL client. */
65 /*****************************/
66 /* Internal static functions */
67 /*****************************/
69 static SSL_CTX *initialise_ssl_ctx(int server_mode, const char *engine_id,
70 const char *CAfile, const char *cert, const char *key,
71 const char *dcert, const char *dkey, const char *cipher_list,
72 const char *dh_file, const char *dh_special, int ctx_options,
73 int out_state, int out_verify, int verify_mode,
74 unsigned int verify_depth);
75 static void selector_init(tunala_selector_t *selector);
76 static void selector_add_listener(tunala_selector_t *selector, int fd);
77 static void selector_add_tunala(tunala_selector_t *selector, tunala_item_t *t);
78 static int selector_select(tunala_selector_t *selector);
79 /* This returns -1 for error, 0 for no new connections, or 1 for success, in
80 * which case *newfd is populated. */
81 static int selector_get_listener(tunala_selector_t *selector, int fd, int *newfd);
82 static int tunala_world_new_item(tunala_world_t *world, int fd,
83 const char *ip, unsigned short port, int flipped);
84 static void tunala_world_del_item(tunala_world_t *world, unsigned int idx);
85 static int tunala_item_io(tunala_selector_t *selector, tunala_item_t *item);
87 /*********************************************/
88 /* MAIN FUNCTION (and its utility functions) */
89 /*********************************************/
91 static const char *def_proxyhost = "127.0.0.1:443";
92 static const char *def_listenhost = "127.0.0.1:8080";
93 static int def_max_tunnels = 50;
94 static const char *def_cacert = NULL;
95 static const char *def_cert = NULL;
96 static const char *def_key = NULL;
97 static const char *def_dcert = NULL;
98 static const char *def_dkey = NULL;
99 static const char *def_engine_id = NULL;
100 static int def_server_mode = 0;
101 static int def_flipped = 0;
102 static const char *def_cipher_list = NULL;
103 static const char *def_dh_file = NULL;
104 static const char *def_dh_special = NULL;
105 static int def_ctx_options = 0;
106 static int def_verify_mode = 0;
107 static unsigned int def_verify_depth = 10;
108 static int def_out_state = 0;
109 static unsigned int def_out_verify = 0;
110 static int def_out_totals = 0;
111 static int def_out_conns = 0;
113 static const char *helpstring =
114 "\n'Tunala' (A tunneler with a New Zealand accent)\n"
115 "Usage: tunala [options], where options are from;\n"
116 " -listen [host:]<port> (default = 127.0.0.1:8080)\n"
117 " -proxy <host>:<port> (default = 127.0.0.1:443)\n"
118 " -maxtunnels <num> (default = 50)\n"
119 " -cacert <path|NULL> (default = NULL)\n"
120 " -cert <path|NULL> (default = NULL)\n"
121 " -key <path|NULL> (default = whatever '-cert' is)\n"
122 " -dcert <path|NULL> (usually for DSA, default = NULL)\n"
123 " -dkey <path|NULL> (usually for DSA, default = whatever '-dcert' is)\n"
124 " -engine <id|NULL> (default = NULL)\n"
125 " -server <0|1> (default = 0, ie. an SSL client)\n"
126 " -flipped <0|1> (makes SSL servers be network clients, and vice versa)\n"
127 " -cipher <list> (specifies cipher list to use)\n"
128 " -dh_file <path> (a PEM file containing DH parameters to use)\n"
129 " -dh_special <NULL|generate|standard> (see below: def=NULL)\n"
130 " -no_ssl2 (disable SSLv2)\n"
131 " -no_ssl3 (disable SSLv3)\n"
132 " -no_tls1 (disable TLSv1)\n"
133 " -v_peer (verify the peer certificate)\n"
134 " -v_strict (do not continue if peer doesn't authenticate)\n"
135 " -v_once (no verification in renegotiates)\n"
136 " -v_depth <num> (limit certificate chain depth, default = 10)\n"
137 " -out_conns (prints client connections and disconnections)\n"
138 " -out_state (prints SSL handshake states)\n"
139 " -out_verify <0|1|2|3> (prints certificate verification states: def=1)\n"
140 " -out_totals (prints out byte-totals when a tunnel closes)\n"
141 " -<h|help|?> (displays this help screen)\n"
143 "(1) It is recommended to specify a cert+key when operating as an SSL server.\n"
144 " If you only specify '-cert', the same file must contain a matching\n"
146 "(2) Either dh_file or dh_special can be used to specify where DH parameters\n"
147 " will be obtained from (or '-dh_special NULL' for the default choice) but\n"
148 " you cannot specify both. For dh_special, 'generate' will create new DH\n"
149 " parameters on startup, and 'standard' will use embedded parameters\n"
151 "(3) Normally an ssl client connects to an ssl server - so that an 'ssl client\n"
152 " tunala' listens for 'clean' client connections and proxies ssl, and an\n"
153 " 'ssl server tunala' listens for ssl connections and proxies 'clean'. With\n"
154 " '-flipped 1', this behaviour is reversed so that an 'ssl server tunala'\n"
155 " listens for clean client connections and proxies ssl (but participating\n"
156 " as an ssl *server* in the SSL/TLS protocol), and an 'ssl client tunala'\n"
157 " listens for ssl connections (participating as an ssl *client* in the\n"
158 " SSL/TLS protocol) and proxies 'clean' to the end destination. This can\n"
159 " be useful for allowing network access to 'servers' where only the server\n"
160 " needs to authenticate the client (ie. the other way is not required).\n"
161 " Even with client and server authentication, this 'technique' mitigates\n"
162 " some DoS (denial-of-service) potential as it will be the network client\n"
163 " having to perform the first private key operation rather than the other\n"
165 "(4) The 'technique' used by setting '-flipped 1' is probably compatible with\n"
166 " absolutely nothing except another complimentary instance of 'tunala'\n"
167 " running with '-flipped 1'. :-)\n";
169 /* Default DH parameters for use with "-dh_special standard" ... stolen striaght
171 static unsigned char dh512_p[]={
172 0xDA,0x58,0x3C,0x16,0xD9,0x85,0x22,0x89,0xD0,0xE4,0xAF,0x75,
173 0x6F,0x4C,0xCA,0x92,0xDD,0x4B,0xE5,0x33,0xB8,0x04,0xFB,0x0F,
174 0xED,0x94,0xEF,0x9C,0x8A,0x44,0x03,0xED,0x57,0x46,0x50,0xD3,
175 0x69,0x99,0xDB,0x29,0xD7,0x76,0x27,0x6B,0xA2,0xD3,0xD4,0x12,
176 0xE2,0x18,0xF4,0xDD,0x1E,0x08,0x4C,0xF6,0xD8,0x00,0x3E,0x7C,
179 static unsigned char dh512_g[]={
183 /* And the function that parses the above "standard" parameters, again, straight
184 * out of s_server. */
185 static DH *get_dh512(void)
189 if ((dh=DH_new()) == NULL) return(NULL);
190 dh->p=BN_bin2bn(dh512_p,sizeof(dh512_p),NULL);
191 dh->g=BN_bin2bn(dh512_g,sizeof(dh512_g),NULL);
192 if ((dh->p == NULL) || (dh->g == NULL))
197 /* Various help/error messages used by main() */
198 static int usage(const char *errstr, int isunknownarg)
201 fprintf(stderr, "Error: unknown argument '%s'\n", errstr);
203 fprintf(stderr, "Error: %s\n", errstr);
204 fprintf(stderr, "%s\n", helpstring);
208 static int err_str0(const char *str0)
210 fprintf(stderr, "%s\n", str0);
214 static int err_str1(const char *fmt, const char *str1)
216 fprintf(stderr, fmt, str1);
217 fprintf(stderr, "\n");
221 static int parse_max_tunnels(const char *s, unsigned int *maxtunnels)
224 if(!int_strtoul(s, &l) || (l < 1) || (l > 1024)) {
225 fprintf(stderr, "Error, '%s' is an invalid value for "
229 *maxtunnels = (unsigned int)l;
233 static int parse_server_mode(const char *s, int *servermode)
236 if(!int_strtoul(s, &l) || (l > 1)) {
237 fprintf(stderr, "Error, '%s' is an invalid value for the "
241 *servermode = (int)l;
245 static int parse_dh_special(const char *s, const char **dh_special)
247 if((strcmp(s, "NULL") == 0) || (strcmp(s, "generate") == 0) ||
248 (strcmp(s, "standard") == 0)) {
252 fprintf(stderr, "Error, '%s' is an invalid value for 'dh_special'\n", s);
256 static int parse_verify_level(const char *s, unsigned int *verify_level)
259 if(!int_strtoul(s, &l) || (l > 3)) {
260 fprintf(stderr, "Error, '%s' is an invalid value for "
264 *verify_level = (unsigned int)l;
268 static int parse_verify_depth(const char *s, unsigned int *verify_depth)
271 if(!int_strtoul(s, &l) || (l < 1) || (l > 50)) {
272 fprintf(stderr, "Error, '%s' is an invalid value for "
273 "verify_depth\n", s);
276 *verify_depth = (unsigned int)l;
280 /* Some fprintf format strings used when tunnels close */
281 static const char *io_stats_dirty =
282 " SSL traffic; %8lu bytes in, %8lu bytes out\n";
283 static const char *io_stats_clean =
284 " clear traffic; %8lu bytes in, %8lu bytes out\n";
286 int main(int argc, char *argv[])
290 tunala_world_t world;
291 tunala_item_t *t_item;
292 const char *proxy_ip;
293 unsigned short proxy_port;
295 const char *proxyhost = def_proxyhost;
296 const char *listenhost = def_listenhost;
297 unsigned int max_tunnels = def_max_tunnels;
298 const char *cacert = def_cacert;
299 const char *cert = def_cert;
300 const char *key = def_key;
301 const char *dcert = def_dcert;
302 const char *dkey = def_dkey;
303 const char *engine_id = def_engine_id;
304 int server_mode = def_server_mode;
305 int flipped = def_flipped;
306 const char *cipher_list = def_cipher_list;
307 const char *dh_file = def_dh_file;
308 const char *dh_special = def_dh_special;
309 int ctx_options = def_ctx_options;
310 int verify_mode = def_verify_mode;
311 unsigned int verify_depth = def_verify_depth;
312 int out_state = def_out_state;
313 unsigned int out_verify = def_out_verify;
314 int out_totals = def_out_totals;
315 int out_conns = def_out_conns;
317 /* Parse command-line arguments */
321 if(strcmp(*argv, "-listen") == 0) {
323 return usage("-listen requires an argument", 0);
327 } else if(strcmp(*argv, "-proxy") == 0) {
329 return usage("-proxy requires an argument", 0);
333 } else if(strcmp(*argv, "-maxtunnels") == 0) {
335 return usage("-maxtunnels requires an argument", 0);
337 if(!parse_max_tunnels(*argv, &max_tunnels))
340 } else if(strcmp(*argv, "-cacert") == 0) {
342 return usage("-cacert requires an argument", 0);
344 if(strcmp(*argv, "NULL") == 0)
349 } else if(strcmp(*argv, "-cert") == 0) {
351 return usage("-cert requires an argument", 0);
353 if(strcmp(*argv, "NULL") == 0)
358 } else if(strcmp(*argv, "-key") == 0) {
360 return usage("-key requires an argument", 0);
362 if(strcmp(*argv, "NULL") == 0)
367 } else if(strcmp(*argv, "-dcert") == 0) {
369 return usage("-dcert requires an argument", 0);
371 if(strcmp(*argv, "NULL") == 0)
376 } else if(strcmp(*argv, "-dkey") == 0) {
378 return usage("-dkey requires an argument", 0);
380 if(strcmp(*argv, "NULL") == 0)
385 } else if(strcmp(*argv, "-engine") == 0) {
387 return usage("-engine requires an argument", 0);
391 } else if(strcmp(*argv, "-server") == 0) {
393 return usage("-server requires an argument", 0);
395 if(!parse_server_mode(*argv, &server_mode))
398 } else if(strcmp(*argv, "-flipped") == 0) {
400 return usage("-flipped requires an argument", 0);
402 if(!parse_server_mode(*argv, &flipped))
405 } else if(strcmp(*argv, "-cipher") == 0) {
407 return usage("-cipher requires an argument", 0);
411 } else if(strcmp(*argv, "-dh_file") == 0) {
413 return usage("-dh_file requires an argument", 0);
415 return usage("cannot mix -dh_file with "
420 } else if(strcmp(*argv, "-dh_special") == 0) {
422 return usage("-dh_special requires an argument", 0);
424 return usage("cannot mix -dh_file with "
427 if(!parse_dh_special(*argv, &dh_special))
430 } else if(strcmp(*argv, "-no_ssl2") == 0) {
431 ctx_options |= SSL_OP_NO_SSLv2;
433 } else if(strcmp(*argv, "-no_ssl3") == 0) {
434 ctx_options |= SSL_OP_NO_SSLv3;
436 } else if(strcmp(*argv, "-no_tls1") == 0) {
437 ctx_options |= SSL_OP_NO_TLSv1;
439 } else if(strcmp(*argv, "-v_peer") == 0) {
440 verify_mode |= SSL_VERIFY_PEER;
442 } else if(strcmp(*argv, "-v_strict") == 0) {
443 verify_mode |= SSL_VERIFY_FAIL_IF_NO_PEER_CERT;
445 } else if(strcmp(*argv, "-v_once") == 0) {
446 verify_mode |= SSL_VERIFY_CLIENT_ONCE;
448 } else if(strcmp(*argv, "-v_depth") == 0) {
450 return usage("-v_depth requires an argument", 0);
452 if(!parse_verify_depth(*argv, &verify_depth))
455 } else if(strcmp(*argv, "-out_state") == 0) {
458 } else if(strcmp(*argv, "-out_verify") == 0) {
460 return usage("-out_verify requires an argument", 0);
462 if(!parse_verify_level(*argv, &out_verify))
465 } else if(strcmp(*argv, "-out_totals") == 0) {
468 } else if(strcmp(*argv, "-out_conns") == 0) {
471 } else if((strcmp(*argv, "-h") == 0) ||
472 (strcmp(*argv, "-help") == 0) ||
473 (strcmp(*argv, "-?") == 0)) {
474 fprintf(stderr, "%s\n", helpstring);
477 return usage(*argv, 1);
479 /* Run any sanity checks we want here */
480 if(!cert && !dcert && server_mode)
481 fprintf(stderr, "WARNING: you are running an SSL server without "
482 "a certificate - this may not work!\n");
484 /* Initialise network stuff */
486 return err_str0("ip_initialise failed");
487 /* Create the SSL_CTX */
488 if((world.ssl_ctx = initialise_ssl_ctx(server_mode, engine_id,
489 cacert, cert, key, dcert, dkey, cipher_list, dh_file,
490 dh_special, ctx_options, out_state, out_verify,
491 verify_mode, verify_depth)) == NULL)
492 return err_str1("initialise_ssl_ctx(engine_id=%s) failed",
493 (engine_id == NULL) ? "NULL" : engine_id);
495 fprintf(stderr, "Info, engine '%s' initialised\n", engine_id);
496 /* Create the listener */
497 if((world.listen_fd = ip_create_listener(listenhost)) == -1)
498 return err_str1("ip_create_listener(%s) failed", listenhost);
499 fprintf(stderr, "Info, listening on '%s'\n", listenhost);
500 if(!ip_parse_address(proxyhost, &proxy_ip, &proxy_port, 0))
501 return err_str1("ip_parse_address(%s) failed", proxyhost);
502 fprintf(stderr, "Info, proxying to '%s' (%d.%d.%d.%d:%d)\n", proxyhost,
503 (int)proxy_ip[0], (int)proxy_ip[1],
504 (int)proxy_ip[2], (int)proxy_ip[3], (int)proxy_port);
505 fprintf(stderr, "Info, set maxtunnels to %d\n", (int)max_tunnels);
506 fprintf(stderr, "Info, set to operate as an SSL %s\n",
507 (server_mode ? "server" : "client"));
508 /* Initialise the rest of the stuff */
509 world.tunnels_used = world.tunnels_size = 0;
510 world.tunnels = NULL;
511 world.server_mode = server_mode;
512 selector_init(&world.selector);
514 /* We're ready to loop */
516 /* Should we listen for *new* tunnels? */
517 if(world.tunnels_used < max_tunnels)
518 selector_add_listener(&world.selector, world.listen_fd);
519 /* We should add in our existing tunnels */
520 for(loop = 0; loop < world.tunnels_used; loop++)
521 selector_add_tunala(&world.selector, world.tunnels + loop);
522 /* Now do the select */
523 switch(selector_select(&world.selector)) {
525 fprintf(stderr, "selector_select returned a badness error.\n");
526 goto shouldnt_happen;
528 fprintf(stderr, "Warn, selector_select returned 0 - signal?""?\n");
533 /* Accept new connection if we should and can */
534 if((world.tunnels_used < max_tunnels) && (selector_get_listener(
535 &world.selector, world.listen_fd,
537 /* We have a new connection */
538 if(!tunala_world_new_item(&world, newfd, proxy_ip,
539 proxy_port, flipped))
540 fprintf(stderr, "tunala_world_new_item failed\n");
542 fprintf(stderr, "Info, new tunnel opened, now up to "
543 "%d\n", world.tunnels_used);
545 /* Give each tunnel its moment, note the while loop is because it makes
546 * the logic easier than with "for" to deal with an array that may shift
547 * because of deletes. */
549 t_item = world.tunnels;
550 while(loop < world.tunnels_used) {
551 if(!tunala_item_io(&world.selector, t_item)) {
552 /* We're closing whether for reasons of an error or a
553 * natural close. Don't increment loop or t_item because
554 * the next item is moving to us! */
557 fprintf(stderr, "Tunnel closing, traffic stats follow\n");
558 /* Display the encrypted (over the network) stats */
559 fprintf(stderr, io_stats_dirty,
560 buffer_total_in(state_machine_get_buffer(
561 &t_item->sm,SM_DIRTY_IN)),
562 buffer_total_out(state_machine_get_buffer(
563 &t_item->sm,SM_DIRTY_OUT)));
564 /* Display the local (tunnelled) stats. NB: Data we
565 * *receive* is data sent *out* of the state_machine on
566 * its 'clean' side. Hence the apparent back-to-front
567 * OUT/IN mixup here :-) */
568 fprintf(stderr, io_stats_clean,
569 buffer_total_out(state_machine_get_buffer(
570 &t_item->sm,SM_CLEAN_OUT)),
571 buffer_total_in(state_machine_get_buffer(
572 &t_item->sm,SM_CLEAN_IN)));
574 tunala_world_del_item(&world, loop);
576 fprintf(stderr, "Info, tunnel closed, down to %d\n",
580 /* Move to the next item */
586 /* Should never get here */
596 static int ctx_set_cert(SSL_CTX *ctx, const char *cert, const char *key)
600 EVP_PKEY *pkey = NULL;
601 int toret = 0; /* Assume an error */
605 if((fp = fopen(cert, "r")) == NULL) {
606 fprintf(stderr, "Error opening cert file '%s'\n", cert);
609 if(!PEM_read_X509(fp, &x509, NULL, NULL)) {
610 fprintf(stderr, "Error reading PEM cert from '%s'\n",
614 if(!SSL_CTX_use_certificate(ctx, x509)) {
615 fprintf(stderr, "Error, cert in '%s' can not be used\n",
619 /* Clear the FILE* for reuse in the "key" code */
622 fprintf(stderr, "Info, operating with cert in '%s'\n", cert);
623 /* If a cert was given without matching key, we assume the same
624 * file contains the required key. */
629 fprintf(stderr, "Error, can't specify a key without a "
630 "corresponding certificate\n");
632 fprintf(stderr, "Error, ctx_set_cert called with "
638 if((fp = fopen(key, "r")) == NULL) {
639 fprintf(stderr, "Error opening key file '%s'\n", key);
642 if(!PEM_read_PrivateKey(fp, &pkey, NULL, NULL)) {
643 fprintf(stderr, "Error reading PEM key from '%s'\n",
647 if(!SSL_CTX_use_PrivateKey(ctx, pkey)) {
648 fprintf(stderr, "Error, key in '%s' can not be used\n",
652 fprintf(stderr, "Info, operating with key in '%s'\n", key);
654 fprintf(stderr, "Info, operating without a cert or key\n");
666 static int ctx_set_dh(SSL_CTX *ctx, const char *dh_file, const char *dh_special)
672 if(strcmp(dh_special, "NULL") == 0)
674 if(strcmp(dh_special, "standard") == 0) {
675 if((dh = get_dh512()) == NULL) {
676 fprintf(stderr, "Error, can't parse 'standard'"
680 fprintf(stderr, "Info, using 'standard' DH parameters\n");
683 if(strcmp(dh_special, "generate") != 0)
684 /* This shouldn't happen - screening values is handled
687 fprintf(stderr, "Info, generating DH parameters ... ");
689 if((dh = DH_generate_parameters(512, DH_GENERATOR_5,
690 NULL, NULL)) == NULL) {
691 fprintf(stderr, "error!\n");
694 fprintf(stderr, "complete\n");
697 /* So, we're loading dh_file */
698 if((fp = fopen(dh_file, "r")) == NULL) {
699 fprintf(stderr, "Error, couldn't open '%s' for DH parameters\n",
703 dh = PEM_read_DHparams(fp, NULL, NULL, NULL);
706 fprintf(stderr, "Error, could not parse DH parameters from '%s'\n",
710 fprintf(stderr, "Info, using DH parameters from file '%s'\n", dh_file);
712 SSL_CTX_set_tmp_dh(ctx, dh);
717 static SSL_CTX *initialise_ssl_ctx(int server_mode, const char *engine_id,
718 const char *CAfile, const char *cert, const char *key,
719 const char *dcert, const char *dkey, const char *cipher_list,
720 const char *dh_file, const char *dh_special, int ctx_options,
721 int out_state, int out_verify, int verify_mode,
722 unsigned int verify_depth)
724 SSL_CTX *ctx = NULL, *ret = NULL;
728 OpenSSL_add_ssl_algorithms();
729 SSL_load_error_strings();
731 meth = (server_mode ? SSLv23_server_method() : SSLv23_client_method());
735 ENGINE_load_builtin_engines();
736 if((e = ENGINE_by_id(engine_id)) == NULL) {
737 fprintf(stderr, "Error obtaining '%s' engine, openssl "
738 "errors follow\n", engine_id);
741 if(!ENGINE_set_default(e, ENGINE_METHOD_ALL)) {
742 fprintf(stderr, "Error assigning '%s' engine, openssl "
743 "errors follow\n", engine_id);
748 if((ctx = SSL_CTX_new(meth)) == NULL)
752 if(!X509_STORE_load_locations(SSL_CTX_get_cert_store(ctx),
754 fprintf(stderr, "Error loading CA cert(s) in '%s'\n",
758 fprintf(stderr, "Info, operating with CA cert(s) in '%s'\n",
761 fprintf(stderr, "Info, operating without a CA cert(-list)\n");
762 if(!SSL_CTX_set_default_verify_paths(ctx)) {
763 fprintf(stderr, "Error setting default verify paths\n");
768 if((cert || key) && !ctx_set_cert(ctx, cert, key))
771 if((dcert || dkey) && !ctx_set_cert(ctx, dcert, dkey))
776 if(!SSL_CTX_set_cipher_list(ctx, cipher_list)) {
777 fprintf(stderr, "Error setting cipher list '%s'\n",
781 fprintf(stderr, "Info, set cipher list '%s'\n", cipher_list);
783 fprintf(stderr, "Info, operating with default cipher list\n");
785 /* dh_file & dh_special */
786 if((dh_file || dh_special) && !ctx_set_dh(ctx, dh_file, dh_special))
790 SSL_CTX_set_options(ctx, ctx_options);
792 /* out_state (output of SSL handshake states to screen). */
794 cb_ssl_info_set_output(stderr);
798 cb_ssl_verify_set_output(stderr);
799 cb_ssl_verify_set_level(out_verify);
803 cb_ssl_verify_set_depth(verify_depth);
805 /* Success! (includes setting verify_mode) */
806 SSL_CTX_set_info_callback(ctx, cb_ssl_info);
807 SSL_CTX_set_verify(ctx, verify_mode, cb_ssl_verify);
811 ERR_print_errors_fp(stderr);
822 static void selector_sets_init(select_sets_t *s)
827 FD_ZERO(&s->excepts);
829 static void selector_init(tunala_selector_t *selector)
831 selector_sets_init(&selector->last_selected);
832 selector_sets_init(&selector->next_select);
835 #define SEL_EXCEPTS 0x00
836 #define SEL_READS 0x01
837 #define SEL_SENDS 0x02
838 static void selector_add_raw_fd(tunala_selector_t *s, int fd, int flags)
840 FD_SET(fd, &s->next_select.excepts);
841 if(flags & SEL_READS)
842 FD_SET(fd, &s->next_select.reads);
843 if(flags & SEL_SENDS)
844 FD_SET(fd, &s->next_select.sends);
846 if(s->next_select.max < (fd + 1))
847 s->next_select.max = fd + 1;
850 static void selector_add_listener(tunala_selector_t *selector, int fd)
852 selector_add_raw_fd(selector, fd, SEL_READS);
855 static void selector_add_tunala(tunala_selector_t *s, tunala_item_t *t)
857 /* Set clean read if sm.clean_in is not full */
858 if(t->clean_read != -1) {
859 selector_add_raw_fd(s, t->clean_read,
860 (buffer_full(state_machine_get_buffer(&t->sm,
861 SM_CLEAN_IN)) ? SEL_EXCEPTS : SEL_READS));
863 /* Set clean send if sm.clean_out is not empty */
864 if(t->clean_send != -1) {
865 selector_add_raw_fd(s, t->clean_send,
866 (buffer_empty(state_machine_get_buffer(&t->sm,
867 SM_CLEAN_OUT)) ? SEL_EXCEPTS : SEL_SENDS));
869 /* Set dirty read if sm.dirty_in is not full */
870 if(t->dirty_read != -1) {
871 selector_add_raw_fd(s, t->dirty_read,
872 (buffer_full(state_machine_get_buffer(&t->sm,
873 SM_DIRTY_IN)) ? SEL_EXCEPTS : SEL_READS));
875 /* Set dirty send if sm.dirty_out is not empty */
876 if(t->dirty_send != -1) {
877 selector_add_raw_fd(s, t->dirty_send,
878 (buffer_empty(state_machine_get_buffer(&t->sm,
879 SM_DIRTY_OUT)) ? SEL_EXCEPTS : SEL_SENDS));
883 static int selector_select(tunala_selector_t *selector)
885 memcpy(&selector->last_selected, &selector->next_select,
886 sizeof(select_sets_t));
887 selector_sets_init(&selector->next_select);
888 return select(selector->last_selected.max,
889 &selector->last_selected.reads,
890 &selector->last_selected.sends,
891 &selector->last_selected.excepts, NULL);
894 /* This returns -1 for error, 0 for no new connections, or 1 for success, in
895 * which case *newfd is populated. */
896 static int selector_get_listener(tunala_selector_t *selector, int fd, int *newfd)
898 if(FD_ISSET(fd, &selector->last_selected.excepts))
900 if(!FD_ISSET(fd, &selector->last_selected.reads))
902 if((*newfd = ip_accept_connection(fd)) == -1)
907 /************************/
908 /* "Tunala" world stuff */
909 /************************/
911 static int tunala_world_make_room(tunala_world_t *world)
913 unsigned int newsize;
914 tunala_item_t *newarray;
916 if(world->tunnels_used < world->tunnels_size)
918 newsize = (world->tunnels_size == 0 ? 16 :
919 ((world->tunnels_size * 3) / 2));
920 if((newarray = malloc(newsize * sizeof(tunala_item_t))) == NULL)
922 memset(newarray, 0, newsize * sizeof(tunala_item_t));
923 if(world->tunnels_used > 0)
924 memcpy(newarray, world->tunnels,
925 world->tunnels_used * sizeof(tunala_item_t));
926 if(world->tunnels_size > 0)
927 free(world->tunnels);
929 world->tunnels = newarray;
930 world->tunnels_size = newsize;
934 static int tunala_world_new_item(tunala_world_t *world, int fd,
935 const char *ip, unsigned short port, int flipped)
941 if(!tunala_world_make_room(world))
943 if((new_ssl = SSL_new(world->ssl_ctx)) == NULL) {
944 fprintf(stderr, "Error creating new SSL\n");
945 ERR_print_errors_fp(stderr);
948 item = world->tunnels + (world->tunnels_used++);
949 state_machine_init(&item->sm);
950 item->clean_read = item->clean_send =
951 item->dirty_read = item->dirty_send = -1;
952 if((newfd = ip_create_connection_split(ip, port)) == -1)
954 /* Which way round? If we're a server, "fd" is the dirty side and the
955 * connection we open is the clean one. For a client, it's the other way
956 * around. Unless, of course, we're "flipped" in which case everything
957 * gets reversed. :-) */
958 if((world->server_mode && !flipped) ||
959 (!world->server_mode && flipped)) {
960 item->dirty_read = item->dirty_send = fd;
961 item->clean_read = item->clean_send = newfd;
963 item->clean_read = item->clean_send = fd;
964 item->dirty_read = item->dirty_send = newfd;
966 /* We use the SSL's "app_data" to indicate a call-back induced "kill" */
967 SSL_set_app_data(new_ssl, NULL);
968 if(!state_machine_set_SSL(&item->sm, new_ssl, world->server_mode))
972 tunala_world_del_item(world, world->tunnels_used - 1);
977 static void tunala_world_del_item(tunala_world_t *world, unsigned int idx)
979 tunala_item_t *item = world->tunnels + idx;
980 if(item->clean_read != -1)
981 close(item->clean_read);
982 if(item->clean_send != item->clean_read)
983 close(item->clean_send);
984 item->clean_read = item->clean_send = -1;
985 if(item->dirty_read != -1)
986 close(item->dirty_read);
987 if(item->dirty_send != item->dirty_read)
988 close(item->dirty_send);
989 item->dirty_read = item->dirty_send = -1;
990 state_machine_close(&item->sm);
991 /* OK, now we fix the item array */
992 if(idx + 1 < world->tunnels_used)
993 /* We need to scroll entries to the left */
994 memmove(world->tunnels + idx,
995 world->tunnels + (idx + 1),
996 (world->tunnels_used - (idx + 1)) *
997 sizeof(tunala_item_t));
998 world->tunnels_used--;
1001 static int tunala_item_io(tunala_selector_t *selector, tunala_item_t *item)
1003 int c_r, c_s, d_r, d_s; /* Four boolean flags */
1005 /* Take ourselves out of the gene-pool if there was an except */
1006 if((item->clean_read != -1) && FD_ISSET(item->clean_read,
1007 &selector->last_selected.excepts))
1009 if((item->clean_send != -1) && FD_ISSET(item->clean_send,
1010 &selector->last_selected.excepts))
1012 if((item->dirty_read != -1) && FD_ISSET(item->dirty_read,
1013 &selector->last_selected.excepts))
1015 if((item->dirty_send != -1) && FD_ISSET(item->dirty_send,
1016 &selector->last_selected.excepts))
1018 /* Grab our 4 IO flags */
1019 c_r = c_s = d_r = d_s = 0;
1020 if(item->clean_read != -1)
1021 c_r = FD_ISSET(item->clean_read, &selector->last_selected.reads);
1022 if(item->clean_send != -1)
1023 c_s = FD_ISSET(item->clean_send, &selector->last_selected.sends);
1024 if(item->dirty_read != -1)
1025 d_r = FD_ISSET(item->dirty_read, &selector->last_selected.reads);
1026 if(item->dirty_send != -1)
1027 d_s = FD_ISSET(item->dirty_send, &selector->last_selected.sends);
1028 /* If no IO has happened for us, skip needless data looping */
1029 if(!c_r && !c_s && !d_r && !d_s)
1032 c_r = (buffer_from_fd(state_machine_get_buffer(&item->sm,
1033 SM_CLEAN_IN), item->clean_read) <= 0);
1035 c_s = (buffer_to_fd(state_machine_get_buffer(&item->sm,
1036 SM_CLEAN_OUT), item->clean_send) <= 0);
1038 d_r = (buffer_from_fd(state_machine_get_buffer(&item->sm,
1039 SM_DIRTY_IN), item->dirty_read) <= 0);
1041 d_s = (buffer_to_fd(state_machine_get_buffer(&item->sm,
1042 SM_DIRTY_OUT), item->dirty_send) <= 0);
1043 /* If any of the flags is non-zero, that means they need closing */
1045 close(item->clean_read);
1046 if(item->clean_send == item->clean_read)
1047 item->clean_send = -1;
1048 item->clean_read = -1;
1050 if(c_s && (item->clean_send != -1)) {
1051 close(item->clean_send);
1052 if(item->clean_send == item->clean_read)
1053 item->clean_read = -1;
1054 item->clean_send = -1;
1057 close(item->dirty_read);
1058 if(item->dirty_send == item->dirty_read)
1059 item->dirty_send = -1;
1060 item->dirty_read = -1;
1062 if(d_s && (item->dirty_send != -1)) {
1063 close(item->dirty_send);
1064 if(item->dirty_send == item->dirty_read)
1065 item->dirty_read = -1;
1066 item->dirty_send = -1;
1068 /* This function name is attributed to the term donated by David
1069 * Schwartz on openssl-dev, message-ID:
1070 * <NCBBLIEPOCNJOAEKBEAKEEDGLIAA.davids@webmaster.com>. :-) */
1071 if(!state_machine_churn(&item->sm))
1072 /* If the SSL closes, it will also zero-out the _in buffers
1073 * and will in future process just outgoing data. As and
1074 * when the outgoing data has gone, it will return zero
1075 * here to tell us to bail out. */
1077 /* Otherwise, we return zero if both sides are dead. */
1078 if(((item->clean_read == -1) || (item->clean_send == -1)) &&
1079 ((item->dirty_read == -1) || (item->dirty_send == -1)))
1081 /* If only one side closed, notify the SSL of this so it can take
1082 * appropriate action. */
1083 if((item->clean_read == -1) || (item->clean_send == -1)) {
1084 if(!state_machine_close_clean(&item->sm))
1087 if((item->dirty_read == -1) || (item->dirty_send == -1)) {
1088 if(!state_machine_close_dirty(&item->sm))