git ssb

Files: 9cc47a157d0302350ef9b12e141746ef7ef1da3b / sslh-main.c

20047 bytesRaw

1 /*
2 # main: processing of config file, command line options and start the main
3 # loop.
4 #
5 # Copyright (C) 2007-2016  Yves Rutschle
6 # 
7 # This program is free software; you can redistribute it
8 # and/or modify it under the terms of the GNU General Public
9 # License as published by the Free Software Foundation; either
10 # version 2 of the License, or (at your option) any later
11 # version.
12 # 
13 # This program is distributed in the hope that it will be
14 # useful, but WITHOUT ANY WARRANTY; without even the implied
15 # warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
16 # PURPOSE.  See the GNU General Public License for more
17 # details.
18 # 
19 # The full text for the General Public License is here:
20 # http://www.gnu.org/licenses/gpl.html
21 
22 */
23 
24 #define _GNU_SOURCE
25 #ifdef LIBCONFIG
26 #include <libconfig.h>
27 #endif
28 #ifdef ENABLE_REGEX
29 #ifdef LIBPCRE
30 #include <pcreposix.h>
31 #else
32 #include <regex.h>
33 #endif
34 #endif
35 
36 #include "common.h"
37 #include "probe.h"
38 
39 const char* USAGE_STRING =
40 "sslh " VERSION "\n" \
41 "usage:\n" \
42 "\tsslh  [-v] [-i] [-V] [-f] [-n] [--transparent] [-F <file>]\n"
43 "\t[-t <timeout>] [-P <pidfile>] -u <username> -p <add> [-p <addr> ...] \n" \
44 "%s\n\n" /* Dynamically built list of builtin protocols */  \
45 "\t[--on-timeout <addr>]\n" \
46 "-v: verbose\n" \
47 "-V: version\n" \
48 "-f: foreground\n" \
49 "-n: numeric output\n" \
50 "-u: specify under which user to run\n" \
51 "--transparent: behave as a transparent proxy\n" \
52 "-F: use configuration file\n" \
53 "--on-timeout: connect to specified address upon timeout (default: ssh address)\n" \
54 "-t: seconds to wait before connecting to --on-timeout address.\n" \
55 "-p: address and port to listen on.\n    Can be used several times to bind to several addresses.\n" \
56 "--[ssh,ssl,...]: where to connect connections from corresponding protocol.\n" \
57 "-P: PID file.\n" \
58 "-i: Run as a inetd service.\n" \
59 "";
60 
61 /* Constants for options that have no one-character shorthand */
62 #define OPT_ONTIMEOUT   257
63 
64 static struct option const_options[] = {
65     { "inetd",      no_argument,            &inetd,         1 },
66     { "foreground", no_argument,            &foreground,    1 },
67     { "background", no_argument,            &background,    1 },
68     { "transparent", no_argument,           &transparent,   1 },
69     { "numeric",    no_argument,            &numeric,       1 },
70     { "verbose",    no_argument,            &verbose,       1 },
71     { "user",       required_argument,      0,              'u' },
72     { "config",     optional_argument,      0,              'F' },
73     { "pidfile",    required_argument,      0,              'P' },
74     { "timeout",    required_argument,      0,              't' },
75     { "on-timeout", required_argument,      0,              OPT_ONTIMEOUT },
76     { "listen",     required_argument,      0,              'p' },
77     {}
78 };
79 static struct option* all_options;
80 static struct proto* builtins;
81 static const char *optstr = "vt:T:p:VP:F::";
82 
83 
84 
85 static void print_usage(void)
86 {
87     struct proto *p;
88     int i;
89     int res;
90     char *prots = "";
91 
92     p = get_builtins();
93     for (i = 0; i < get_num_builtins(); i++) {
94         res = asprintf(&prots, "%s\t[--%s <addr>]\n", prots, p[i].description);
95         CHECK_RES_DIE(res, "asprintf");
96     }
97 
98     fprintf(stderr, USAGE_STRING, prots);
99 }
100 
101 static void printcaps(void) {
102 #ifdef LIBCAP
103     cap_t caps;
104     char* desc;
105     ssize_t len;
106 
107     caps = cap_get_proc();
108 
109     desc = cap_to_text(caps, &len);
110 
111     fprintf(stderr, "capabilities: %s\n", desc);
112 
113     cap_free(caps);
114     cap_free(desc);
115 #endif
116 }
117 
118 static void printsettings(void)
119 {
120     char buf[NI_MAXHOST];
121     struct addrinfo *a;
122     struct proto *p;
123     
124     for (p = get_first_protocol(); p; p = p->next) {
125         fprintf(stderr,
126                 "%s addr: %s. libwrap service: %s log_level: %d family %d %d [%s]\n", 
127                 p->description, 
128                 sprintaddr(buf, sizeof(buf), p->saddr), 
129                 p->service,
130                 p->log_level,
131                 p->saddr->ai_family,
132                 p->saddr->ai_addr->sa_family,
133                 p->keepalive ? "keepalive" : "");
134     }
135     fprintf(stderr, "listening on:\n");
136     for (a = addr_listen; a; a = a->ai_next) {
137         fprintf(stderr, 
138                 "\t%s\t[%s]\n", 
139                 sprintaddr(buf, sizeof(buf), a), 
140                 a->ai_flags & SO_KEEPALIVE ? "keepalive" : "");
141     }
142     fprintf(stderr, "timeout: %d\non-timeout: %s\n", probing_timeout,
143             timeout_protocol()->description);
144 }
145 
146 
147 /* Extract configuration on addresses and ports on which to listen.
148  * out: newly allocated list of addrinfo to listen to
149  */
150 #ifdef LIBCONFIG
151 static int config_listen(config_t *config, struct addrinfo **listen) 
152 {
153     config_setting_t *setting, *addr;
154     int len, i, keepalive;
155     const char *hostname, *port;
156 
157     setting = config_lookup(config, "listen");
158     if (setting) {
159         len = config_setting_length(setting);
160         for (i = 0; i < len; i++) {
161             addr = config_setting_get_elem(setting, i);
162             if (! (config_setting_lookup_string(addr, "host", &hostname) &&
163                    config_setting_lookup_string(addr, "port", &port))) {
164                 fprintf(stderr,
165                             "line %d:Incomplete specification (hostname and port required)\n",
166                             config_setting_source_line(addr));
167                 return -1;
168             }
169 
170             keepalive = 0;
171             config_setting_lookup_bool(addr, "keepalive", &keepalive);
172 
173             resolve_split_name(listen, hostname, port);
174 
175             /* getaddrinfo returned a list of addresses corresponding to the
176              * specification; move the pointer to the end of that list before
177              * processing the next specification, while setting flags for
178              * start_listen_sockets() through ai_flags (which is not meant for
179              * that, but is only used as hint in getaddrinfo, so it's OK) */
180             for (; *listen; listen = &((*listen)->ai_next)) {
181                 if (keepalive)
182                     (*listen)->ai_flags = SO_KEEPALIVE;
183             }
184         }
185     }
186 
187     return 0;
188 }
189 #endif
190 
191 
192 
193 #ifdef LIBCONFIG
194 static void setup_regex_probe(struct proto *p, config_setting_t* probes)
195 {
196 #ifdef ENABLE_REGEX
197     int num_probes, errsize, i, res;
198     char *err;
199     const char * expr;
200     regex_t** probe_list;
201 
202     num_probes = config_setting_length(probes);
203     if (!num_probes) {
204         fprintf(stderr, "%s: no probes specified\n", p->description);
205         exit(1);
206     }
207 
208     p->probe = get_probe("regex");
209     probe_list = calloc(num_probes + 1, sizeof(*probe_list));
210     p->data = (void*)probe_list;
211 
212     for (i = 0; i < num_probes; i++) {
213         probe_list[i] = malloc(sizeof(*(probe_list[i])));
214         expr = config_setting_get_string_elem(probes, i);
215         res = regcomp(probe_list[i], expr, 0);
216         if (res) {
217             err = malloc(errsize = regerror(res, probe_list[i], NULL, 0));
218             regerror(res, probe_list[i], err, errsize);
219             fprintf(stderr, "%s:%s\n", expr, err);
220             free(err);
221             exit(1);
222         }
223     }
224 #else
225     fprintf(stderr, "line %d: regex probe specified but not compiled in\n", config_setting_source_line(probes));
226     exit(5);
227 #endif
228 }
229 #endif
230 
231 #ifdef LIBCONFIG
232 static void setup_sni_alpn_list(struct proto *p, config_setting_t* config_items, const char* name, int alpn)
233 {
234     int num_probes, i, max_server_name_len, server_name_len;
235     const char * config_item;
236     char** sni_hostname_list;
237 
238     if(!config_items || !config_setting_is_array(config_items)) {
239         fprintf(stderr, "%s: no %s specified\n", p->description, name);
240         return;
241     }
242     num_probes = config_setting_length(config_items);
243     if (!num_probes) {
244         fprintf(stderr, "%s: no %s specified\n", p->description, name);
245         return;
246     }
247 
248     max_server_name_len = 0;
249     for (i = 0; i < num_probes; i++) {
250         server_name_len = strlen(config_setting_get_string_elem(config_items, i));
251         if(server_name_len > max_server_name_len)
252             max_server_name_len = server_name_len;
253     }
254 
255     sni_hostname_list = calloc(num_probes + 1, ++max_server_name_len);
256 
257     for (i = 0; i < num_probes; i++) {
258         config_item = config_setting_get_string_elem(config_items, i);
259         sni_hostname_list[i] = malloc(max_server_name_len);
260         strcpy (sni_hostname_list[i], config_item);
261         if(verbose) fprintf(stderr, "%s: %s[%d]: %s\n", p->description, name, i, sni_hostname_list[i]);
262     }
263 
264     p->data = (void*)tls_data_set_list(p->data, alpn, sni_hostname_list);
265 }
266 
267 static void setup_sni_alpn(struct proto *p, config_setting_t* sni_hostnames, config_setting_t* alpn_protocols)
268 {
269     p->data = (void*)new_tls_data();
270     p->probe = get_probe("sni_alpn");
271     setup_sni_alpn_list(p, sni_hostnames, "sni_hostnames", 0);
272     setup_sni_alpn_list(p, alpn_protocols, "alpn_protocols", 1);
273 }
274 #endif
275 
276 /* Extract configuration for protocols to connect to.
277  * out: newly-allocated list of protocols
278  */
279 #ifdef LIBCONFIG
280 static int config_protocols(config_t *config, struct proto **prots)
281 {
282     config_setting_t *setting, *prot, *patterns, *sni_hostnames, *alpn_protocols;
283     const char *hostname, *port, *name;
284     int i, num_prots;
285     struct proto *p, *prev = NULL;
286 
287     setting = config_lookup(config, "protocols");
288     if (setting) {
289         num_prots = config_setting_length(setting);
290         for (i = 0; i < num_prots; i++) {
291             p = calloc(1, sizeof(*p));
292             if (i == 0) *prots = p;
293             if (prev) prev->next = p;
294             prev = p;
295 
296             prot = config_setting_get_elem(setting, i);
297             if ((config_setting_lookup_string(prot, "name", &name) &&
298                  config_setting_lookup_string(prot, "host", &hostname) &&
299                  config_setting_lookup_string(prot, "port", &port)
300                 )) {
301                 p->description = name;
302                 config_setting_lookup_string(prot, "service", &(p->service));
303                 config_setting_lookup_bool(prot, "keepalive", &p->keepalive);
304 
305                 if (config_setting_lookup_int(prot, "log_level", &p->log_level) == CONFIG_FALSE) {
306                     p->log_level = 1;
307                 }
308 
309                 resolve_split_name(&(p->saddr), hostname, port);
310 
311                 p->probe = get_probe(name);
312                 if (!p->probe || !strcmp(name, "sni_alpn")) {
313                     fprintf(stderr, "line %d: %s: probe unknown\n", config_setting_source_line(prot), name);
314                     exit(1);
315                 }
316 
317                 /* Probe-specific options: regex patterns */
318                 if (!strcmp(name, "regex")) {
319                     patterns = config_setting_get_member(prot, "regex_patterns");
320                     if (patterns && config_setting_is_array(patterns)) {
321                         setup_regex_probe(p, patterns);
322                     }
323                 }
324 
325                 /* Probe-specific options: SNI/ALPN */
326                 if (!strcmp(name, "tls")) {
327                     sni_hostnames = config_setting_get_member(prot, "sni_hostnames");
328                     alpn_protocols = config_setting_get_member(prot, "alpn_protocols");
329 
330                     if((sni_hostnames && config_setting_is_array(sni_hostnames)) || (alpn_protocols && config_setting_is_array(alpn_protocols))) {
331                         setup_sni_alpn(p, sni_hostnames, alpn_protocols);
332                     }
333                 }
334 
335             }
336         }
337     }
338 
339     return 0;
340 }
341 #endif
342 
343 /* Parses a config file
344  * in: *filename
345  * out: *listen, a newly-allocated linked list of listen addrinfo
346  *      *prots, a newly-allocated linked list of protocols
347  *      1 on error, 0 on success
348  */
349 #ifdef LIBCONFIG
350 static int config_parse(char *filename, struct addrinfo **listen, struct proto **prots)
351 {
352     config_t config;
353     int timeout;
354     const char* str;
355 
356     config_init(&config);
357     if (config_read_file(&config, filename) == CONFIG_FALSE) {
358         /* If it's a parse error then there will be a line number for the failure
359          * an I/O error (such as non-existent file) will have the error line as 0
360          */
361         if (config_error_line(&config) != 0) {
362             fprintf(stderr, "%s:%d:%s\n", 
363                     filename,
364                     config_error_line(&config),
365                     config_error_text(&config));
366             exit(1);
367         }
368         fprintf(stderr, "%s:%s\n", 
369                 filename,
370                 config_error_text(&config));
371         return 1;
372     }
373 
374     config_lookup_bool(&config, "verbose", &verbose);
375     config_lookup_bool(&config, "inetd", &inetd);
376     config_lookup_bool(&config, "foreground", &foreground);
377     config_lookup_bool(&config, "numeric", &numeric);
378     config_lookup_bool(&config, "transparent", &transparent);
379 
380     if (config_lookup_int(&config, "timeout", (int *)&timeout) == CONFIG_TRUE) {
381         probing_timeout = timeout;
382     }
383 
384     if (config_lookup_string(&config, "on-timeout", &str)) {
385         set_ontimeout(str);
386     }
387 
388     config_lookup_string(&config, "user", &user_name);
389     config_lookup_string(&config, "pidfile", &pid_file);
390 
391     config_listen(&config, listen);
392     config_protocols(&config, prots);
393 
394     return 0;
395 }
396 #endif
397 
398 /* Adds protocols to the list of options, so command-line parsing uses the
399  * protocol definition array 
400  * options: array of options to add to; must be big enough
401  * n_opts: number of options in *options before calling (i.e. where to append)
402  * prot: array of protocols
403  * n_prots: number of protocols in *prot
404  * */
405 static void append_protocols(struct option *options, int n_opts, struct proto *prot , int n_prots)
406 {
407     int o, p;
408 
409     for (o = n_opts, p = 0; p < n_prots; o++, p++) {
410         options[o].name = prot[p].description;
411         options[o].has_arg = required_argument;
412         options[o].flag = 0;
413         options[o].val = p + PROT_SHIFT;
414     }
415 }
416 
417 static void make_alloptions(void)
418 {
419     builtins = get_builtins();
420 
421     /* Create all_options, composed of const_options followed by one option per
422      * known protocol */
423     all_options = calloc(ARRAY_SIZE(const_options) + get_num_builtins(), sizeof(struct option));
424     memcpy(all_options, const_options, sizeof(const_options));
425     append_protocols(all_options, ARRAY_SIZE(const_options) - 1, builtins, get_num_builtins());
426 }
427 
428 /* Performs a first scan of command line options to see if a configuration file
429  * is specified. If there is one, parse it now before all other options (so
430  * configuration file settings can be overridden from the command line).
431  *
432  * prots: newly-allocated list of configured protocols, if any.
433  */
434 static void cmdline_config(int argc, char* argv[], struct proto** prots)
435 {
436 #ifdef LIBCONFIG
437     int c, res;
438     char *config_filename;
439 #endif
440 
441     make_alloptions();
442 
443 #ifdef LIBCONFIG
444     optind = 1;
445     opterr = 0; /* we're missing protocol options at this stage so don't output errors */
446     while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
447         if (c == 'v') {
448             verbose++;
449         }
450         if (c == 'F') {
451             config_filename = optarg;
452             if (config_filename) {
453                 res = config_parse(config_filename, &addr_listen, prots);
454             } else {
455                 /* No configuration file specified -- try default file locations */
456                 res = config_parse("/etc/sslh/sslh.cfg", &addr_listen, prots);
457                 if (!res && verbose) fprintf(stderr, "Using /etc/sslh/sslh.cfg\n");
458                 if (res) {
459                     res = config_parse("/etc/sslh.cfg", &addr_listen, prots);
460                     if (!res && verbose) fprintf(stderr, "Using /etc/sslh.cfg\n");
461                 }
462             }
463             if (res)
464                 exit(4);
465             break;
466         }
467     }
468 #endif
469 }
470 
471 
472 /* Parse command-line options. prots points to a list of configured protocols,
473  * potentially non-allocated */
474 static void parse_cmdline(int argc, char* argv[], struct proto* prots)
475 {
476     int c;
477     struct addrinfo **a;
478     struct proto *p;
479 
480     optind = 1;
481     opterr = 1;
482 next_arg:
483     while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
484         if (c == 0) continue;
485 
486         if (c >= PROT_SHIFT) {
487             if (prots)
488                 for (p = prots; p && p->next; p = p->next) {
489                     /* override if protocol was already defined by config file 
490                      * (note it only overrides address and use builtin probe) */
491                     if (!strcmp(p->description, builtins[c-PROT_SHIFT].description)) {
492                         resolve_name(&(p->saddr), optarg);
493                         p->probe = builtins[c-PROT_SHIFT].probe;
494                         goto next_arg;
495                     }
496                 }
497             /* At this stage, it's a new protocol: add it to the end of the
498              * list */
499             if (!prots) {
500                 /* No protocols yet -- create the list */
501                 p = prots = calloc(1, sizeof(*p));
502             } else {
503                 p->next = calloc(1, sizeof(*p));
504                 p = p->next;
505             }
506             memcpy(p, &builtins[c-PROT_SHIFT], sizeof(*p));
507             resolve_name(&(p->saddr), optarg);
508             continue;
509         }
510 
511         switch (c) {
512 
513         case 'F':
514             /* Legal option, but do nothing, it was already processed in
515              * cmdline_config() */
516 #ifndef LIBCONFIG
517             fprintf(stderr, "Built without libconfig support: configuration file not available.\n");
518             exit(1);
519 #endif
520             break;
521 
522         case 't':
523              probing_timeout = atoi(optarg);
524             break;
525 
526         case OPT_ONTIMEOUT:
527             set_ontimeout(optarg);
528             break;
529 
530         case 'p':
531             /* find the end of the listen list */
532             for (a = &addr_listen; *a; a = &((*a)->ai_next));
533             /* append the specified addresses */
534             resolve_name(a, optarg);
535             
536             break;
537 
538         case 'V':
539             printf("%s %s\n", server_type, VERSION);
540             exit(0);
541 
542         case 'u':
543             user_name = optarg;
544             break;
545 
546         case 'P':
547             pid_file = optarg;
548             break;
549 
550         case 'v':
551             verbose++;
552             break;
553 
554         default:
555             print_usage();
556             exit(2);
557         }
558     }
559 
560     if (!prots) {
561         fprintf(stderr, "At least one target protocol must be specified.\n");
562         exit(2);
563     }
564 
565     set_protocol_list(prots);
566 
567 /* If compiling with systemd socket support no need to require listen address */
568 #ifndef SYSTEMD
569     if (!addr_listen && !inetd) {
570         fprintf(stderr, "No listening address specified; use at least one -p option\n");
571         exit(1);
572     }
573 #endif
574 
575     /* Did command-line override foreground setting? */
576     if (background)
577         foreground = 0;
578 
579 }
580 
581 int main(int argc, char *argv[])
582 {
583 
584    extern char *optarg;
585    extern int optind;
586    int res, num_addr_listen;
587    struct proto* protocols = NULL;
588 
589    int *listen_sockets;
590 
591    /* Init defaults */
592    pid_file = NULL;
593    user_name = NULL;
594 
595    cmdline_config(argc, argv, &protocols);
596    parse_cmdline(argc, argv, protocols);
597 
598    if (inetd)
599    {
600        verbose = 0;
601        start_shoveler(0);
602        exit(0);
603    }
604 
605    if (verbose)
606        printsettings();
607 
608    num_addr_listen = start_listen_sockets(&listen_sockets, addr_listen);
609 
610 #ifdef SYSTEMD
611    if (num_addr_listen < 1) {
612      fprintf(stderr, "No listening sockets found, restart sockets or specify addresses in config\n");
613      exit(1);
614     }
615 #endif
616 
617    if (!foreground) {
618        if (fork() > 0) exit(0); /* Detach */
619 
620        /* New session -- become group leader */
621        if (getuid() == 0) {
622            res = setsid();
623            CHECK_RES_DIE(res, "setsid: already process leader");
624        }
625    }
626 
627    setup_signals();
628 
629    if (pid_file)
630        write_pid_file(pid_file);
631 
632    if (user_name)
633        drop_privileges(user_name);
634 
635 
636    /* Open syslog connection */
637    setup_syslog(argv[0]);
638 
639    if (verbose)
640        printcaps();
641 
642    main_loop(listen_sockets, num_addr_listen);
643 
644    return 0;
645 }
646

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Tree: 9cc47a157d0302350ef9b12e141746ef7ef1da3b

Files: 9cc47a157d0302350ef9b12e141746ef7ef1da3b / sslh-main.c

1	/*
2	# main: processing of config file, command line options and start the main
3	# loop.
4	#
5	# Copyright (C) 2007-2016 Yves Rutschle
6	#
7	# This program is free software; you can redistribute it
8	# and/or modify it under the terms of the GNU General Public
9	# License as published by the Free Software Foundation; either
10	# version 2 of the License, or (at your option) any later
11	# version.
12	#
13	# This program is distributed in the hope that it will be
14	# useful, but WITHOUT ANY WARRANTY; without even the implied
15	# warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
16	# PURPOSE. See the GNU General Public License for more
17	# details.
18	#
19	# The full text for the General Public License is here:
20	# http://www.gnu.org/licenses/gpl.html
21
22	*/
23
24	#define _GNU_SOURCE
25	#ifdef LIBCONFIG
26	#include <libconfig.h>
27	#endif
28	#ifdef ENABLE_REGEX
29	#ifdef LIBPCRE
30	#include <pcreposix.h>
31	#else
32	#include <regex.h>
33	#endif
34	#endif
35
36	#include "common.h"
37	#include "probe.h"
38
39	const char* USAGE_STRING =
40	"sslh " VERSION "\n" \
41	"usage:\n" \
42	"\tsslh [-v] [-i] [-V] [-f] [-n] [--transparent] [-F <file>]\n"
43	"\t[-t <timeout>] [-P <pidfile>] -u <username> -p <add> [-p <addr> ...] \n" \
44	"%s\n\n" /* Dynamically built list of builtin protocols */ \
45	"\t[--on-timeout <addr>]\n" \
46	"-v: verbose\n" \
47	"-V: version\n" \
48	"-f: foreground\n" \
49	"-n: numeric output\n" \
50	"-u: specify under which user to run\n" \
51	"--transparent: behave as a transparent proxy\n" \
52	"-F: use configuration file\n" \
53	"--on-timeout: connect to specified address upon timeout (default: ssh address)\n" \
54	"-t: seconds to wait before connecting to --on-timeout address.\n" \
55	"-p: address and port to listen on.\n Can be used several times to bind to several addresses.\n" \
56	"--[ssh,ssl,...]: where to connect connections from corresponding protocol.\n" \
57	"-P: PID file.\n" \
58	"-i: Run as a inetd service.\n" \
59	"";
60
61	/* Constants for options that have no one-character shorthand */
62	#define OPT_ONTIMEOUT 257
63
64	static struct option const_options[] = {
65	{ "inetd", no_argument, &inetd, 1 },
66	{ "foreground", no_argument, &foreground, 1 },
67	{ "background", no_argument, &background, 1 },
68	{ "transparent", no_argument, &transparent, 1 },
69	{ "numeric", no_argument, &numeric, 1 },
70	{ "verbose", no_argument, &verbose, 1 },
71	{ "user", required_argument, 0, 'u' },
72	{ "config", optional_argument, 0, 'F' },
73	{ "pidfile", required_argument, 0, 'P' },
74	{ "timeout", required_argument, 0, 't' },
75	{ "on-timeout", required_argument, 0, OPT_ONTIMEOUT },
76	{ "listen", required_argument, 0, 'p' },
77	{}
78	};
79	static struct option* all_options;
80	static struct proto* builtins;
81	static const char *optstr = "vt:T:p:VP:F::";
82
83
84
85	static void print_usage(void)
86	{
87	struct proto *p;
88	int i;
89	int res;
90	char *prots = "";
91
92	p = get_builtins();
93	for (i = 0; i < get_num_builtins(); i++) {
94	res = asprintf(&prots, "%s\t[--%s <addr>]\n", prots, p[i].description);
95	CHECK_RES_DIE(res, "asprintf");
96	}
97
98	fprintf(stderr, USAGE_STRING, prots);
99	}
100
101	static void printcaps(void) {
102	#ifdef LIBCAP
103	cap_t caps;
104	char* desc;
105	ssize_t len;
106
107	caps = cap_get_proc();
108
109	desc = cap_to_text(caps, &len);
110
111	fprintf(stderr, "capabilities: %s\n", desc);
112
113	cap_free(caps);
114	cap_free(desc);
115	#endif
116	}
117
118	static void printsettings(void)
119	{
120	char buf[NI_MAXHOST];
121	struct addrinfo *a;
122	struct proto *p;
123
124	for (p = get_first_protocol(); p; p = p->next) {
125	fprintf(stderr,
126	"%s addr: %s. libwrap service: %s log_level: %d family %d %d [%s]\n",
127	p->description,
128	sprintaddr(buf, sizeof(buf), p->saddr),
129	p->service,
130	p->log_level,
131	p->saddr->ai_family,
132	p->saddr->ai_addr->sa_family,
133	p->keepalive ? "keepalive" : "");
134	}
135	fprintf(stderr, "listening on:\n");
136	for (a = addr_listen; a; a = a->ai_next) {
137	fprintf(stderr,
138	"\t%s\t[%s]\n",
139	sprintaddr(buf, sizeof(buf), a),
140	a->ai_flags & SO_KEEPALIVE ? "keepalive" : "");
141	}
142	fprintf(stderr, "timeout: %d\non-timeout: %s\n", probing_timeout,
143	timeout_protocol()->description);
144	}
145
146
147	/* Extract configuration on addresses and ports on which to listen.
148	* out: newly allocated list of addrinfo to listen to
149	*/
150	#ifdef LIBCONFIG
151	static int config_listen(config_t config, struct addrinfo *listen)
152	{
153	config_setting_t setting, addr;
154	int len, i, keepalive;
155	const char hostname, port;
156
157	setting = config_lookup(config, "listen");
158	if (setting) {
159	len = config_setting_length(setting);
160	for (i = 0; i < len; i++) {
161	addr = config_setting_get_elem(setting, i);
162	if (! (config_setting_lookup_string(addr, "host", &hostname) &&
163	config_setting_lookup_string(addr, "port", &port))) {
164	fprintf(stderr,
165	"line %d:Incomplete specification (hostname and port required)\n",
166	config_setting_source_line(addr));
167	return -1;
168	}
169
170	keepalive = 0;
171	config_setting_lookup_bool(addr, "keepalive", &keepalive);
172
173	resolve_split_name(listen, hostname, port);
174
175	/* getaddrinfo returned a list of addresses corresponding to the
176	* specification; move the pointer to the end of that list before
177	* processing the next specification, while setting flags for
178	* start_listen_sockets() through ai_flags (which is not meant for
179	* that, but is only used as hint in getaddrinfo, so it's OK) */
180	for (; listen; listen = &((listen)->ai_next)) {
181	if (keepalive)
182	(*listen)->ai_flags = SO_KEEPALIVE;
183	}
184	}
185	}
186
187	return 0;
188	}
189	#endif
190
191
192
193	#ifdef LIBCONFIG
194	static void setup_regex_probe(struct proto p, config_setting_t probes)
195	{
196	#ifdef ENABLE_REGEX
197	int num_probes, errsize, i, res;
198	char *err;
199	const char * expr;
200	regex_t** probe_list;
201
202	num_probes = config_setting_length(probes);
203	if (!num_probes) {
204	fprintf(stderr, "%s: no probes specified\n", p->description);
205	exit(1);
206	}
207
208	p->probe = get_probe("regex");
209	probe_list = calloc(num_probes + 1, sizeof(*probe_list));
210	p->data = (void*)probe_list;
211
212	for (i = 0; i < num_probes; i++) {
213	probe_list[i] = malloc(sizeof(*(probe_list[i])));
214	expr = config_setting_get_string_elem(probes, i);
215	res = regcomp(probe_list[i], expr, 0);
216	if (res) {
217	err = malloc(errsize = regerror(res, probe_list[i], NULL, 0));
218	regerror(res, probe_list[i], err, errsize);
219	fprintf(stderr, "%s:%s\n", expr, err);
220	free(err);
221	exit(1);
222	}
223	}
224	#else
225	fprintf(stderr, "line %d: regex probe specified but not compiled in\n", config_setting_source_line(probes));
226	exit(5);
227	#endif
228	}
229	#endif
230
231	#ifdef LIBCONFIG
232	static void setup_sni_alpn_list(struct proto p, config_setting_t config_items, const char* name, int alpn)
233	{
234	int num_probes, i, max_server_name_len, server_name_len;
235	const char * config_item;
236	char** sni_hostname_list;
237
238	if(!config_items \|\| !config_setting_is_array(config_items)) {
239	fprintf(stderr, "%s: no %s specified\n", p->description, name);
240	return;
241	}
242	num_probes = config_setting_length(config_items);
243	if (!num_probes) {
244	fprintf(stderr, "%s: no %s specified\n", p->description, name);
245	return;
246	}
247
248	max_server_name_len = 0;
249	for (i = 0; i < num_probes; i++) {
250	server_name_len = strlen(config_setting_get_string_elem(config_items, i));
251	if(server_name_len > max_server_name_len)
252	max_server_name_len = server_name_len;
253	}
254
255	sni_hostname_list = calloc(num_probes + 1, ++max_server_name_len);
256
257	for (i = 0; i < num_probes; i++) {
258	config_item = config_setting_get_string_elem(config_items, i);
259	sni_hostname_list[i] = malloc(max_server_name_len);
260	strcpy (sni_hostname_list[i], config_item);
261	if(verbose) fprintf(stderr, "%s: %s[%d]: %s\n", p->description, name, i, sni_hostname_list[i]);
262	}
263
264	p->data = (void*)tls_data_set_list(p->data, alpn, sni_hostname_list);
265	}
266
267	static void setup_sni_alpn(struct proto p, config_setting_t sni_hostnames, config_setting_t* alpn_protocols)
268	{
269	p->data = (void*)new_tls_data();
270	p->probe = get_probe("sni_alpn");
271	setup_sni_alpn_list(p, sni_hostnames, "sni_hostnames", 0);
272	setup_sni_alpn_list(p, alpn_protocols, "alpn_protocols", 1);
273	}
274	#endif
275
276	/* Extract configuration for protocols to connect to.
277	* out: newly-allocated list of protocols
278	*/
279	#ifdef LIBCONFIG
280	static int config_protocols(config_t config, struct proto *prots)
281	{
282	config_setting_t setting, prot, patterns, sni_hostnames, *alpn_protocols;
283	const char hostname, port, *name;
284	int i, num_prots;
285	struct proto p, prev = NULL;
286
287	setting = config_lookup(config, "protocols");
288	if (setting) {
289	num_prots = config_setting_length(setting);
290	for (i = 0; i < num_prots; i++) {
291	p = calloc(1, sizeof(*p));
292	if (i == 0) *prots = p;
293	if (prev) prev->next = p;
294	prev = p;
295
296	prot = config_setting_get_elem(setting, i);
297	if ((config_setting_lookup_string(prot, "name", &name) &&
298	config_setting_lookup_string(prot, "host", &hostname) &&
299	config_setting_lookup_string(prot, "port", &port)
300	)) {
301	p->description = name;
302	config_setting_lookup_string(prot, "service", &(p->service));
303	config_setting_lookup_bool(prot, "keepalive", &p->keepalive);
304
305	if (config_setting_lookup_int(prot, "log_level", &p->log_level) == CONFIG_FALSE) {
306	p->log_level = 1;
307	}
308
309	resolve_split_name(&(p->saddr), hostname, port);
310
311	p->probe = get_probe(name);
312	if (!p->probe \|\| !strcmp(name, "sni_alpn")) {
313	fprintf(stderr, "line %d: %s: probe unknown\n", config_setting_source_line(prot), name);
314	exit(1);
315	}
316
317	/* Probe-specific options: regex patterns */
318	if (!strcmp(name, "regex")) {
319	patterns = config_setting_get_member(prot, "regex_patterns");
320	if (patterns && config_setting_is_array(patterns)) {
321	setup_regex_probe(p, patterns);
322	}
323	}
324
325	/* Probe-specific options: SNI/ALPN */
326	if (!strcmp(name, "tls")) {
327	sni_hostnames = config_setting_get_member(prot, "sni_hostnames");
328	alpn_protocols = config_setting_get_member(prot, "alpn_protocols");
329
330	if((sni_hostnames && config_setting_is_array(sni_hostnames)) \|\| (alpn_protocols && config_setting_is_array(alpn_protocols))) {
331	setup_sni_alpn(p, sni_hostnames, alpn_protocols);
332	}
333	}
334
335	}
336	}
337	}
338
339	return 0;
340	}
341	#endif
342
343	/* Parses a config file
344	* in: *filename
345	* out: *listen, a newly-allocated linked list of listen addrinfo
346	* *prots, a newly-allocated linked list of protocols
347	* 1 on error, 0 on success
348	*/
349	#ifdef LIBCONFIG
350	static int config_parse(char filename, struct addrinfo listen, struct proto *prots)
351	{
352	config_t config;
353	int timeout;
354	const char* str;
355
356	config_init(&config);
357	if (config_read_file(&config, filename) == CONFIG_FALSE) {
358	/* If it's a parse error then there will be a line number for the failure
359	* an I/O error (such as non-existent file) will have the error line as 0
360	*/
361	if (config_error_line(&config) != 0) {
362	fprintf(stderr, "%s:%d:%s\n",
363	filename,
364	config_error_line(&config),
365	config_error_text(&config));
366	exit(1);
367	}
368	fprintf(stderr, "%s:%s\n",
369	filename,
370	config_error_text(&config));
371	return 1;
372	}
373
374	config_lookup_bool(&config, "verbose", &verbose);
375	config_lookup_bool(&config, "inetd", &inetd);
376	config_lookup_bool(&config, "foreground", &foreground);
377	config_lookup_bool(&config, "numeric", &numeric);
378	config_lookup_bool(&config, "transparent", &transparent);
379
380	if (config_lookup_int(&config, "timeout", (int *)&timeout) == CONFIG_TRUE) {
381	probing_timeout = timeout;
382	}
383
384	if (config_lookup_string(&config, "on-timeout", &str)) {
385	set_ontimeout(str);
386	}
387
388	config_lookup_string(&config, "user", &user_name);
389	config_lookup_string(&config, "pidfile", &pid_file);
390
391	config_listen(&config, listen);
392	config_protocols(&config, prots);
393
394	return 0;
395	}
396	#endif
397
398	/* Adds protocols to the list of options, so command-line parsing uses the
399	* protocol definition array
400	* options: array of options to add to; must be big enough
401	* n_opts: number of options in *options before calling (i.e. where to append)
402	* prot: array of protocols
403	* n_prots: number of protocols in *prot
404	* */
405	static void append_protocols(struct option options, int n_opts, struct proto prot , int n_prots)
406	{
407	int o, p;
408
409	for (o = n_opts, p = 0; p < n_prots; o++, p++) {
410	options[o].name = prot[p].description;
411	options[o].has_arg = required_argument;
412	options[o].flag = 0;
413	options[o].val = p + PROT_SHIFT;
414	}
415	}
416
417	static void make_alloptions(void)
418	{
419	builtins = get_builtins();
420
421	/* Create all_options, composed of const_options followed by one option per
422	* known protocol */
423	all_options = calloc(ARRAY_SIZE(const_options) + get_num_builtins(), sizeof(struct option));
424	memcpy(all_options, const_options, sizeof(const_options));
425	append_protocols(all_options, ARRAY_SIZE(const_options) - 1, builtins, get_num_builtins());
426	}
427
428	/* Performs a first scan of command line options to see if a configuration file
429	* is specified. If there is one, parse it now before all other options (so
430	* configuration file settings can be overridden from the command line).
431	*
432	* prots: newly-allocated list of configured protocols, if any.
433	*/
434	static void cmdline_config(int argc, char* argv[], struct proto** prots)
435	{
436	#ifdef LIBCONFIG
437	int c, res;
438	char *config_filename;
439	#endif
440
441	make_alloptions();
442
443	#ifdef LIBCONFIG
444	optind = 1;
445	opterr = 0; /* we're missing protocol options at this stage so don't output errors */
446	while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
447	if (c == 'v') {
448	verbose++;
449	}
450	if (c == 'F') {
451	config_filename = optarg;
452	if (config_filename) {
453	res = config_parse(config_filename, &addr_listen, prots);
454	} else {
455	/* No configuration file specified -- try default file locations */
456	res = config_parse("/etc/sslh/sslh.cfg", &addr_listen, prots);
457	if (!res && verbose) fprintf(stderr, "Using /etc/sslh/sslh.cfg\n");
458	if (res) {
459	res = config_parse("/etc/sslh.cfg", &addr_listen, prots);
460	if (!res && verbose) fprintf(stderr, "Using /etc/sslh.cfg\n");
461	}
462	}
463	if (res)
464	exit(4);
465	break;
466	}
467	}
468	#endif
469	}
470
471
472	/* Parse command-line options. prots points to a list of configured protocols,
473	* potentially non-allocated */
474	static void parse_cmdline(int argc, char* argv[], struct proto* prots)
475	{
476	int c;
477	struct addrinfo **a;
478	struct proto *p;
479
480	optind = 1;
481	opterr = 1;
482	next_arg:
483	while ((c = getopt_long_only(argc, argv, optstr, all_options, NULL)) != -1) {
484	if (c == 0) continue;
485
486	if (c >= PROT_SHIFT) {
487	if (prots)
488	for (p = prots; p && p->next; p = p->next) {
489	/* override if protocol was already defined by config file
490	* (note it only overrides address and use builtin probe) */
491	if (!strcmp(p->description, builtins[c-PROT_SHIFT].description)) {
492	resolve_name(&(p->saddr), optarg);
493	p->probe = builtins[c-PROT_SHIFT].probe;
494	goto next_arg;
495	}
496	}
497	/* At this stage, it's a new protocol: add it to the end of the
498	* list */
499	if (!prots) {
500	/* No protocols yet -- create the list */
501	p = prots = calloc(1, sizeof(*p));
502	} else {
503	p->next = calloc(1, sizeof(*p));
504	p = p->next;
505	}
506	memcpy(p, &builtins[c-PROT_SHIFT], sizeof(*p));
507	resolve_name(&(p->saddr), optarg);
508	continue;
509	}
510
511	switch (c) {
512
513	case 'F':
514	/* Legal option, but do nothing, it was already processed in
515	* cmdline_config() */
516	#ifndef LIBCONFIG
517	fprintf(stderr, "Built without libconfig support: configuration file not available.\n");
518	exit(1);
519	#endif
520	break;
521
522	case 't':
523	probing_timeout = atoi(optarg);
524	break;
525
526	case OPT_ONTIMEOUT:
527	set_ontimeout(optarg);
528	break;
529
530	case 'p':
531	/* find the end of the listen list */
532	for (a = &addr_listen; a; a = &((a)->ai_next));
533	/* append the specified addresses */
534	resolve_name(a, optarg);
535
536	break;
537
538	case 'V':
539	printf("%s %s\n", server_type, VERSION);
540	exit(0);
541
542	case 'u':
543	user_name = optarg;
544	break;
545
546	case 'P':
547	pid_file = optarg;
548	break;
549
550	case 'v':
551	verbose++;
552	break;
553
554	default:
555	print_usage();
556	exit(2);
557	}
558	}
559
560	if (!prots) {
561	fprintf(stderr, "At least one target protocol must be specified.\n");
562	exit(2);
563	}
564
565	set_protocol_list(prots);
566
567	/* If compiling with systemd socket support no need to require listen address */
568	#ifndef SYSTEMD
569	if (!addr_listen && !inetd) {
570	fprintf(stderr, "No listening address specified; use at least one -p option\n");
571	exit(1);
572	}
573	#endif
574
575	/* Did command-line override foreground setting? */
576	if (background)
577	foreground = 0;
578
579	}
580
581	int main(int argc, char *argv[])
582	{
583
584	extern char *optarg;
585	extern int optind;
586	int res, num_addr_listen;
587	struct proto* protocols = NULL;
588
589	int *listen_sockets;
590
591	/* Init defaults */
592	pid_file = NULL;
593	user_name = NULL;
594
595	cmdline_config(argc, argv, &protocols);
596	parse_cmdline(argc, argv, protocols);
597
598	if (inetd)
599	{
600	verbose = 0;
601	start_shoveler(0);
602	exit(0);
603	}
604
605	if (verbose)
606	printsettings();
607
608	num_addr_listen = start_listen_sockets(&listen_sockets, addr_listen);
609
610	#ifdef SYSTEMD
611	if (num_addr_listen < 1) {
612	fprintf(stderr, "No listening sockets found, restart sockets or specify addresses in config\n");
613	exit(1);
614	}
615	#endif
616
617	if (!foreground) {
618	if (fork() > 0) exit(0); /* Detach */
619
620	/* New session -- become group leader */
621	if (getuid() == 0) {
622	res = setsid();
623	CHECK_RES_DIE(res, "setsid: already process leader");
624	}
625	}
626
627	setup_signals();
628
629	if (pid_file)
630	write_pid_file(pid_file);
631
632	if (user_name)
633	drop_privileges(user_name);
634
635
636	/* Open syslog connection */
637	setup_syslog(argv[0]);
638
639	if (verbose)
640	printcaps();
641
642	main_loop(listen_sockets, num_addr_listen);
643
644	return 0;
645	}
646

cel / sslh

Tree: 9cc47a157d0302350ef9b12e141746ef7ef1da3b shsmasterv1.9v1.8v1.7v1.6v1.5v1.3v1.2v1.18v1.17v1.16v1.15v1.14v1.13v1.12v1.11v1.10v1.1v1.0 <input type="submit" value="Go"/>

Files: 9cc47a157d0302350ef9b12e141746ef7ef1da3b / sslh-main.c

Tree: 9cc47a157d0302350ef9b12e141746ef7ef1da3b