Commit | Line | Data |
---|---|---|
c55a77db PH |
1 | /* A little hacked up program that makes a TCP/IP call and reads a script to |
2 | drive it, for testing Exim server code running as a daemon. It's got a bit | |
3 | messy with the addition of support for either OpenSSL or GnuTLS. The code for | |
f5d78688 JH |
4 | those was hacked out of Exim itself, then code for OCSP stapling was ripped |
5 | from the openssl ocsp and s_client utilities. */ | |
c55a77db PH |
6 | |
7 | /* ANSI C standard includes */ | |
8 | ||
9 | #include <ctype.h> | |
10 | #include <signal.h> | |
11 | #include <stdarg.h> | |
12 | #include <stddef.h> | |
13 | #include <stdio.h> | |
14 | #include <stdlib.h> | |
15 | #include <string.h> | |
16 | #include <time.h> | |
17 | ||
18 | /* Unix includes */ | |
19 | ||
20 | #include <errno.h> | |
21 | #include <dirent.h> | |
22 | #include <sys/types.h> | |
23 | ||
24 | #include <netinet/in_systm.h> | |
25 | #include <netinet/in.h> | |
26 | #include <netinet/ip.h> | |
27 | ||
28 | #include <netdb.h> | |
29 | #include <arpa/inet.h> | |
30 | #include <sys/time.h> | |
31 | #include <sys/resource.h> | |
32 | #include <sys/socket.h> | |
33 | #include <sys/stat.h> | |
34 | #include <fcntl.h> | |
35 | #include <unistd.h> | |
36 | #include <utime.h> | |
37 | ||
38 | #ifdef AF_INET6 | |
39 | #define HAVE_IPV6 1 | |
40 | #endif | |
41 | ||
42 | #ifndef S_ADDR_TYPE | |
43 | #define S_ADDR_TYPE u_long | |
44 | #endif | |
45 | ||
46 | typedef unsigned char uschar; | |
47 | ||
48 | #define CS (char *) | |
49 | #define US (unsigned char *) | |
50 | ||
51 | #define FALSE 0 | |
52 | #define TRUE 1 | |
53 | ||
54 | ||
55 | ||
56 | static int sigalrm_seen = 0; | |
57 | ||
58 | ||
59 | /* TLS support can be optionally included, either for OpenSSL or GnuTLS. The | |
60 | latter needs a whole pile of tables. */ | |
61 | ||
62 | #ifdef HAVE_OPENSSL | |
63 | #define HAVE_TLS | |
64 | #include <openssl/crypto.h> | |
65 | #include <openssl/x509.h> | |
66 | #include <openssl/pem.h> | |
67 | #include <openssl/ssl.h> | |
68 | #include <openssl/err.h> | |
69 | #include <openssl/rand.h> | |
f5d78688 JH |
70 | #include <openssl/ocsp.h> |
71 | ||
72 | char * ocsp_stapling = NULL; | |
c55a77db PH |
73 | #endif |
74 | ||
75 | ||
76 | #ifdef HAVE_GNUTLS | |
77 | #define HAVE_TLS | |
78 | #include <gnutls/gnutls.h> | |
79 | #include <gnutls/x509.h> | |
80 | ||
81 | #define DH_BITS 768 | |
c55a77db PH |
82 | |
83 | /* Local static variables for GNUTLS */ | |
84 | ||
c55a77db PH |
85 | static gnutls_dh_params dh_params = NULL; |
86 | ||
87 | static gnutls_certificate_credentials_t x509_cred = NULL; | |
88 | static gnutls_session tls_session = NULL; | |
89 | ||
90 | static int ssl_session_timeout = 200; | |
91 | ||
92 | /* Priorities for TLS algorithms to use. */ | |
93 | ||
94 | static const int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 }; | |
95 | ||
96 | static const int kx_priority[16] = { | |
97 | GNUTLS_KX_RSA, | |
98 | GNUTLS_KX_DHE_DSS, | |
99 | GNUTLS_KX_DHE_RSA, | |
c55a77db PH |
100 | 0 }; |
101 | ||
102 | static int default_cipher_priority[16] = { | |
103 | GNUTLS_CIPHER_AES_256_CBC, | |
104 | GNUTLS_CIPHER_AES_128_CBC, | |
105 | GNUTLS_CIPHER_3DES_CBC, | |
106 | GNUTLS_CIPHER_ARCFOUR_128, | |
107 | 0 }; | |
108 | ||
109 | static const int mac_priority[16] = { | |
110 | GNUTLS_MAC_SHA, | |
111 | GNUTLS_MAC_MD5, | |
112 | 0 }; | |
113 | ||
114 | static const int comp_priority[16] = { GNUTLS_COMP_NULL, 0 }; | |
115 | static const int cert_type_priority[16] = { GNUTLS_CRT_X509, 0 }; | |
116 | ||
117 | #endif | |
118 | ||
119 | ||
120 | ||
121 | ||
122 | /************************************************* | |
123 | * SIGALRM handler - crash out * | |
124 | *************************************************/ | |
125 | ||
126 | static void | |
127 | sigalrm_handler_crash(int sig) | |
128 | { | |
129 | sig = sig; /* Keep picky compilers happy */ | |
130 | printf("\nClient timed out\n"); | |
131 | exit(99); | |
132 | } | |
133 | ||
134 | ||
135 | /************************************************* | |
136 | * SIGALRM handler - set flag * | |
137 | *************************************************/ | |
138 | ||
139 | static void | |
140 | sigalrm_handler_flag(int sig) | |
141 | { | |
142 | sig = sig; /* Keep picky compilers happy */ | |
143 | sigalrm_seen = 1; | |
144 | } | |
145 | ||
146 | ||
147 | ||
148 | /****************************************************************************/ | |
149 | /****************************************************************************/ | |
150 | ||
151 | #ifdef HAVE_OPENSSL | |
f5d78688 JH |
152 | |
153 | X509_STORE * | |
154 | setup_verify(BIO *bp, char *CAfile, char *CApath) | |
155 | { | |
156 | X509_STORE *store; | |
157 | X509_LOOKUP *lookup; | |
158 | if(!(store = X509_STORE_new())) goto end; | |
159 | lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file()); | |
160 | if (lookup == NULL) goto end; | |
161 | if (CAfile) { | |
162 | if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) { | |
163 | BIO_printf(bp, "Error loading file %s\n", CAfile); | |
164 | goto end; | |
165 | } | |
166 | } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT); | |
167 | ||
168 | lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir()); | |
169 | if (lookup == NULL) goto end; | |
170 | if (CApath) { | |
171 | if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) { | |
172 | BIO_printf(bp, "Error loading directory %s\n", CApath); | |
173 | goto end; | |
174 | } | |
175 | } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT); | |
176 | ||
177 | ERR_clear_error(); | |
178 | return store; | |
179 | end: | |
180 | X509_STORE_free(store); | |
181 | return NULL; | |
182 | } | |
183 | ||
184 | ||
185 | static int | |
186 | tls_client_stapling_cb(SSL *s, void *arg) | |
187 | { | |
188 | const unsigned char *p; | |
189 | int len; | |
190 | OCSP_RESPONSE *rsp; | |
191 | OCSP_BASICRESP *bs; | |
192 | char *CAfile = NULL; | |
193 | X509_STORE *store = NULL; | |
194 | int ret = 1; | |
195 | ||
196 | len = SSL_get_tlsext_status_ocsp_resp(s, &p); | |
197 | /*BIO_printf(arg, "OCSP response: ");*/ | |
198 | if (!p) | |
199 | { | |
200 | BIO_printf(arg, "no response received\n"); | |
201 | return 1; | |
202 | } | |
203 | if(!(rsp = d2i_OCSP_RESPONSE(NULL, &p, len))) | |
204 | { | |
205 | BIO_printf(arg, "response parse error\n"); | |
206 | BIO_dump_indent(arg, (char *)p, len, 4); | |
207 | return 0; | |
208 | } | |
209 | if(!(bs = OCSP_response_get1_basic(rsp))) | |
210 | { | |
211 | BIO_printf(arg, "error parsing response\n"); | |
212 | return 0; | |
213 | } | |
214 | ||
215 | CAfile = ocsp_stapling; | |
216 | if(!(store = setup_verify(arg, CAfile, NULL))) | |
217 | { | |
218 | BIO_printf(arg, "error in cert setup\n"); | |
219 | return 0; | |
220 | } | |
221 | ||
222 | /* No file of alternate certs, no options */ | |
223 | if(OCSP_basic_verify(bs, NULL, store, 0) <= 0) | |
224 | { | |
225 | BIO_printf(arg, "Response Verify Failure\n"); | |
226 | ERR_print_errors(arg); | |
227 | ret = 0; | |
228 | } | |
229 | else | |
230 | BIO_printf(arg, "Response verify OK\n"); | |
231 | ||
232 | X509_STORE_free(store); | |
233 | return ret; | |
234 | } | |
235 | ||
236 | ||
c55a77db PH |
237 | /************************************************* |
238 | * Start an OpenSSL TLS session * | |
239 | *************************************************/ | |
240 | ||
241 | int tls_start(int sock, SSL **ssl, SSL_CTX *ctx) | |
242 | { | |
243 | int rc; | |
244 | static const char *sid_ctx = "exim"; | |
245 | ||
246 | RAND_load_file("client.c", -1); /* Not *very* random! */ | |
247 | ||
248 | *ssl = SSL_new (ctx); | |
249 | SSL_set_session_id_context(*ssl, sid_ctx, strlen(sid_ctx)); | |
250 | SSL_set_fd (*ssl, sock); | |
251 | SSL_set_connect_state(*ssl); | |
252 | ||
f5d78688 JH |
253 | if (ocsp_stapling) |
254 | { | |
255 | SSL_CTX_set_tlsext_status_cb(ctx, tls_client_stapling_cb); | |
256 | SSL_CTX_set_tlsext_status_arg(ctx, BIO_new_fp(stdout, BIO_NOCLOSE)); | |
257 | SSL_set_tlsext_status_type(*ssl, TLSEXT_STATUSTYPE_ocsp); | |
258 | } | |
259 | ||
c55a77db PH |
260 | signal(SIGALRM, sigalrm_handler_flag); |
261 | sigalrm_seen = 0; | |
262 | alarm(5); | |
263 | rc = SSL_connect (*ssl); | |
264 | alarm(0); | |
265 | ||
266 | if (sigalrm_seen) | |
267 | { | |
268 | printf("SSL_connect timed out\n"); | |
269 | return 0; | |
270 | } | |
271 | ||
272 | if (rc <= 0) | |
273 | { | |
274 | ERR_print_errors_fp(stdout); | |
275 | return 0; | |
276 | } | |
277 | ||
278 | printf("SSL connection using %s\n", SSL_get_cipher (*ssl)); | |
279 | return 1; | |
280 | } | |
281 | ||
282 | ||
283 | /************************************************* | |
284 | * SSL Information callback * | |
285 | *************************************************/ | |
286 | ||
287 | static void | |
288 | info_callback(SSL *s, int where, int ret) | |
289 | { | |
290 | where = where; | |
291 | ret = ret; | |
292 | printf("SSL info: %s\n", SSL_state_string_long(s)); | |
293 | } | |
294 | #endif | |
295 | ||
296 | ||
297 | /****************************************************************************/ | |
298 | /****************************************************************************/ | |
299 | ||
300 | ||
301 | #ifdef HAVE_GNUTLS | |
302 | /************************************************* | |
303 | * Handle GnuTLS error * | |
304 | *************************************************/ | |
305 | ||
306 | /* Called from lots of places when errors occur before actually starting to do | |
307 | the TLS handshake, that is, while the session is still in clear. | |
308 | ||
309 | Argument: | |
310 | prefix prefix text | |
311 | err a GnuTLS error number, or 0 if local error | |
312 | ||
313 | Returns: doesn't - it dies | |
314 | */ | |
315 | ||
316 | static void | |
317 | gnutls_error(uschar *prefix, int err) | |
318 | { | |
bb727765 | 319 | fprintf(stderr, "GnuTLS connection error: %s:", prefix); |
c55a77db PH |
320 | if (err != 0) fprintf(stderr, " %s", gnutls_strerror(err)); |
321 | fprintf(stderr, "\n"); | |
322 | exit(1); | |
323 | } | |
324 | ||
325 | ||
326 | ||
327 | /************************************************* | |
bb727765 | 328 | * Setup up DH parameters * |
c55a77db PH |
329 | *************************************************/ |
330 | ||
331 | /* For the test suite, the parameters should always be available in the spool | |
332 | directory. */ | |
333 | ||
334 | static void | |
bb727765 | 335 | init_dh(void) |
c55a77db PH |
336 | { |
337 | int fd; | |
338 | int ret; | |
339 | gnutls_datum m; | |
340 | uschar filename[200]; | |
341 | struct stat statbuf; | |
342 | ||
343 | /* Initialize the data structures for holding the parameters */ | |
344 | ||
c55a77db PH |
345 | ret = gnutls_dh_params_init(&dh_params); |
346 | if (ret < 0) gnutls_error(US"init dh_params", ret); | |
347 | ||
348 | /* Open the cache file for reading and if successful, read it and set up the | |
bb727765 | 349 | parameters. */ |
c55a77db PH |
350 | |
351 | fd = open("aux-fixed/gnutls-params", O_RDONLY, 0); | |
352 | if (fd < 0) | |
353 | { | |
354 | fprintf(stderr, "Failed to open spool/gnutls-params: %s\n", strerror(errno)); | |
355 | exit(1); | |
356 | } | |
357 | ||
358 | if (fstat(fd, &statbuf) < 0) | |
359 | { | |
360 | (void)close(fd); | |
361 | return gnutls_error(US"TLS cache stat failed", 0); | |
362 | } | |
363 | ||
364 | m.size = statbuf.st_size; | |
365 | m.data = malloc(m.size); | |
366 | if (m.data == NULL) | |
367 | return gnutls_error(US"memory allocation failed", 0); | |
368 | if (read(fd, m.data, m.size) != m.size) | |
369 | return gnutls_error(US"TLS cache read failed", 0); | |
370 | (void)close(fd); | |
371 | ||
c55a77db PH |
372 | ret = gnutls_dh_params_import_pkcs3(dh_params, &m, GNUTLS_X509_FMT_PEM); |
373 | if (ret < 0) return gnutls_error(US"DH params import", ret); | |
374 | free(m.data); | |
375 | } | |
376 | ||
377 | ||
378 | ||
379 | ||
380 | /************************************************* | |
381 | * Initialize for GnuTLS * | |
382 | *************************************************/ | |
383 | ||
384 | /* | |
385 | Arguments: | |
386 | certificate certificate file | |
387 | privatekey private key file | |
388 | */ | |
389 | ||
390 | static void | |
391 | tls_init(uschar *certificate, uschar *privatekey) | |
392 | { | |
393 | int rc; | |
394 | ||
395 | rc = gnutls_global_init(); | |
396 | if (rc < 0) gnutls_error(US"gnutls_global_init", rc); | |
397 | ||
bb727765 | 398 | /* Read D-H parameters from the cache file. */ |
c55a77db | 399 | |
bb727765 | 400 | init_dh(); |
c55a77db PH |
401 | |
402 | /* Create the credentials structure */ | |
403 | ||
404 | rc = gnutls_certificate_allocate_credentials(&x509_cred); | |
405 | if (rc < 0) gnutls_error(US"certificate_allocate_credentials", rc); | |
406 | ||
407 | /* Set the certificate and private keys */ | |
408 | ||
409 | if (certificate != NULL) | |
410 | { | |
411 | rc = gnutls_certificate_set_x509_key_file(x509_cred, CS certificate, | |
412 | CS privatekey, GNUTLS_X509_FMT_PEM); | |
413 | if (rc < 0) gnutls_error("gnutls_certificate", rc); | |
414 | } | |
415 | ||
416 | /* Associate the parameters with the x509 credentials structure. */ | |
417 | ||
418 | gnutls_certificate_set_dh_params(x509_cred, dh_params); | |
c55a77db PH |
419 | } |
420 | ||
421 | ||
422 | ||
423 | /************************************************* | |
424 | * Initialize a single GNUTLS session * | |
425 | *************************************************/ | |
426 | ||
427 | static gnutls_session | |
428 | tls_session_init(void) | |
429 | { | |
430 | gnutls_session session; | |
431 | ||
432 | gnutls_init(&session, GNUTLS_CLIENT); | |
433 | ||
434 | gnutls_cipher_set_priority(session, default_cipher_priority); | |
435 | gnutls_compression_set_priority(session, comp_priority); | |
436 | gnutls_kx_set_priority(session, kx_priority); | |
437 | gnutls_protocol_set_priority(session, protocol_priority); | |
438 | gnutls_mac_set_priority(session, mac_priority); | |
439 | ||
440 | gnutls_cred_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred); | |
441 | ||
442 | gnutls_dh_set_prime_bits(session, DH_BITS); | |
443 | gnutls_db_set_cache_expiration(session, ssl_session_timeout); | |
444 | ||
445 | return session; | |
446 | } | |
447 | #endif | |
448 | ||
449 | ||
450 | /****************************************************************************/ | |
451 | /****************************************************************************/ | |
452 | ||
453 | ||
454 | ||
455 | ||
456 | /************************************************* | |
457 | * Main Program * | |
458 | *************************************************/ | |
459 | ||
4fe99a6c PP |
460 | const char * const HELP_MESSAGE = "\n\ |
461 | Usage: client\n\ | |
462 | <IP address>\n\ | |
463 | <port>\n\ | |
464 | [<outgoing interface>]\n\ | |
465 | [<cert file>]\n\ | |
466 | [<key file>]\n\ | |
467 | \n"; | |
c55a77db PH |
468 | |
469 | int main(int argc, char **argv) | |
470 | { | |
471 | struct sockaddr *s_ptr; | |
472 | struct sockaddr_in s_in4; | |
473 | char *interface = NULL; | |
474 | char *address = NULL; | |
475 | char *certfile = NULL; | |
476 | char *keyfile = NULL; | |
1ec3f27d | 477 | char *end = NULL; |
c55a77db PH |
478 | int argi = 1; |
479 | int host_af, port, s_len, rc, sock, save_errno; | |
480 | int timeout = 1; | |
481 | int tls_active = 0; | |
482 | int sent_starttls = 0; | |
483 | int tls_on_connect = 0; | |
1ec3f27d | 484 | long tmplong; |
c55a77db PH |
485 | |
486 | #if HAVE_IPV6 | |
487 | struct sockaddr_in6 s_in6; | |
488 | #endif | |
489 | ||
490 | #ifdef HAVE_OPENSSL | |
491 | SSL_CTX* ctx; | |
492 | SSL* ssl; | |
493 | #endif | |
494 | ||
495 | unsigned char outbuffer[10240]; | |
496 | unsigned char inbuffer[10240]; | |
497 | unsigned char *inptr = inbuffer; | |
498 | ||
499 | *inptr = 0; /* Buffer empty */ | |
500 | ||
501 | /* Options */ | |
502 | ||
503 | while (argc >= argi + 1 && argv[argi][0] == '-') | |
504 | { | |
4fe99a6c PP |
505 | if (strcmp(argv[argi], "-help") == 0 || |
506 | strcmp(argv[argi], "--help") == 0 || | |
507 | strcmp(argv[argi], "-h") == 0) | |
508 | { | |
509 | printf(HELP_MESSAGE); | |
510 | exit(0); | |
511 | } | |
c55a77db PH |
512 | if (strcmp(argv[argi], "-tls-on-connect") == 0) |
513 | { | |
514 | tls_on_connect = 1; | |
515 | argi++; | |
516 | } | |
f5d78688 JH |
517 | #ifdef HAVE_OPENSSL |
518 | else if (strcmp(argv[argi], "-ocsp") == 0) | |
519 | { | |
520 | if (argc < ++argi + 1) | |
521 | { | |
522 | fprintf(stderr, "Missing required certificate file for ocsp option\n"); | |
523 | exit(1); | |
524 | } | |
525 | ocsp_stapling = argv[argi++]; | |
526 | } | |
527 | #endif | |
c55a77db PH |
528 | else if (argv[argi][1] == 't' && isdigit(argv[argi][2])) |
529 | { | |
1ec3f27d PP |
530 | tmplong = strtol(argv[argi]+2, &end, 10); |
531 | if (end == argv[argi]+2 || *end) | |
532 | { | |
533 | fprintf(stderr, "Failed to parse seconds from option <%s>\n", | |
534 | argv[argi]); | |
535 | exit(1); | |
536 | } | |
537 | if (tmplong > 10000L) | |
538 | { | |
539 | fprintf(stderr, "Unreasonably long wait of %d seconds requested\n", | |
540 | tmplong); | |
541 | exit(1); | |
542 | } | |
543 | if (tmplong < 0L) | |
544 | { | |
545 | fprintf(stderr, "Timeout must not be negative (%d)\n", tmplong); | |
546 | exit(1); | |
547 | } | |
548 | timeout = (int) tmplong; | |
c55a77db PH |
549 | argi++; |
550 | } | |
551 | else | |
552 | { | |
1ec3f27d | 553 | fprintf(stderr, "Unrecognized option %s\n", argv[argi]); |
c55a77db PH |
554 | exit(1); |
555 | } | |
556 | } | |
557 | ||
558 | /* Mandatory 1st arg is IP address */ | |
559 | ||
560 | if (argc < argi+1) | |
561 | { | |
1ec3f27d | 562 | fprintf(stderr, "No IP address given\n"); |
c55a77db PH |
563 | exit(1); |
564 | } | |
565 | ||
566 | address = argv[argi++]; | |
567 | host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET; | |
568 | ||
569 | /* Mandatory 2nd arg is port */ | |
570 | ||
571 | if (argc < argi+1) | |
572 | { | |
1ec3f27d | 573 | fprintf(stderr, "No port number given\n"); |
c55a77db PH |
574 | exit(1); |
575 | } | |
576 | ||
577 | port = atoi(argv[argi++]); | |
578 | ||
579 | /* Optional next arg is interface */ | |
580 | ||
581 | if (argc > argi && | |
582 | (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':')) | |
583 | interface = argv[argi++]; | |
584 | ||
585 | /* Any more arguments are the name of a certificate file and key file */ | |
586 | ||
587 | if (argc > argi) certfile = argv[argi++]; | |
588 | if (argc > argi) keyfile = argv[argi++]; | |
589 | ||
590 | ||
591 | #if HAVE_IPV6 | |
592 | /* For an IPv6 address, use an IPv6 sockaddr structure. */ | |
593 | ||
594 | if (host_af == AF_INET6) | |
595 | { | |
596 | s_ptr = (struct sockaddr *)&s_in6; | |
597 | s_len = sizeof(s_in6); | |
598 | } | |
599 | else | |
600 | #endif | |
601 | ||
602 | /* For an IPv4 address, use an IPv4 sockaddr structure, | |
603 | even on an IPv6 system. */ | |
604 | ||
605 | { | |
606 | s_ptr = (struct sockaddr *)&s_in4; | |
607 | s_len = sizeof(s_in4); | |
608 | } | |
609 | ||
610 | printf("Connecting to %s port %d ... ", address, port); | |
611 | ||
612 | sock = socket(host_af, SOCK_STREAM, 0); | |
613 | if (sock < 0) | |
614 | { | |
615 | printf("socket creation failed: %s\n", strerror(errno)); | |
616 | exit(1); | |
617 | } | |
618 | ||
619 | /* Bind to a specific interface if requested. On an IPv6 system, this has | |
620 | to be of the same family as the address we are calling. On an IPv4 system the | |
621 | test is redundant, but it keeps the code tidier. */ | |
622 | ||
623 | if (interface != NULL) | |
624 | { | |
625 | int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET; | |
626 | ||
627 | if (interface_af == host_af) | |
628 | { | |
629 | #if HAVE_IPV6 | |
630 | ||
631 | /* Set up for IPv6 binding */ | |
632 | ||
633 | if (host_af == AF_INET6) | |
634 | { | |
635 | memset(&s_in6, 0, sizeof(s_in6)); | |
636 | s_in6.sin6_family = AF_INET6; | |
637 | s_in6.sin6_port = 0; | |
638 | if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1) | |
639 | { | |
640 | printf("Unable to parse \"%s\"", interface); | |
641 | exit(1); | |
642 | } | |
643 | } | |
644 | else | |
645 | #endif | |
646 | ||
647 | /* Set up for IPv4 binding */ | |
648 | ||
649 | { | |
650 | memset(&s_in4, 0, sizeof(s_in4)); | |
651 | s_in4.sin_family = AF_INET; | |
652 | s_in4.sin_port = 0; | |
653 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface); | |
654 | } | |
655 | ||
656 | /* Bind */ | |
657 | ||
658 | if (bind(sock, s_ptr, s_len) < 0) | |
659 | { | |
660 | printf("Unable to bind outgoing SMTP call to %s: %s", | |
661 | interface, strerror(errno)); | |
662 | exit(1); | |
663 | } | |
664 | } | |
665 | } | |
666 | ||
667 | /* Set up a remote IPv6 address */ | |
668 | ||
669 | #if HAVE_IPV6 | |
670 | if (host_af == AF_INET6) | |
671 | { | |
672 | memset(&s_in6, 0, sizeof(s_in6)); | |
673 | s_in6.sin6_family = AF_INET6; | |
674 | s_in6.sin6_port = htons(port); | |
675 | if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1) | |
676 | { | |
677 | printf("Unable to parse \"%s\"", address); | |
678 | exit(1); | |
679 | } | |
680 | } | |
681 | else | |
682 | #endif | |
683 | ||
684 | /* Set up a remote IPv4 address */ | |
685 | ||
686 | { | |
687 | memset(&s_in4, 0, sizeof(s_in4)); | |
688 | s_in4.sin_family = AF_INET; | |
689 | s_in4.sin_port = htons(port); | |
690 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address); | |
691 | } | |
692 | ||
693 | /* SIGALRM handler crashes out */ | |
694 | ||
695 | signal(SIGALRM, sigalrm_handler_crash); | |
696 | alarm(timeout); | |
697 | rc = connect(sock, s_ptr, s_len); | |
698 | save_errno = errno; | |
699 | alarm(0); | |
700 | ||
701 | /* A failure whose error code is "Interrupted system call" is in fact | |
702 | an externally applied timeout if the signal handler has been run. */ | |
703 | ||
704 | if (rc < 0) | |
705 | { | |
706 | close(sock); | |
707 | printf("failed: %s\n", strerror(save_errno)); | |
708 | exit(1); | |
709 | } | |
710 | ||
711 | printf("connected\n"); | |
712 | ||
713 | ||
714 | /* --------------- Set up for OpenSSL --------------- */ | |
715 | ||
716 | #ifdef HAVE_OPENSSL | |
717 | SSL_library_init(); | |
718 | SSL_load_error_strings(); | |
719 | ||
720 | ctx = SSL_CTX_new(SSLv23_method()); | |
721 | if (ctx == NULL) | |
722 | { | |
723 | printf ("SSL_CTX_new failed\n"); | |
724 | exit(1); | |
725 | } | |
726 | ||
727 | if (certfile != NULL) | |
728 | { | |
729 | if (!SSL_CTX_use_certificate_file(ctx, certfile, SSL_FILETYPE_PEM)) | |
730 | { | |
731 | printf("SSL_CTX_use_certificate_file failed\n"); | |
732 | exit(1); | |
733 | } | |
734 | printf("Certificate file = %s\n", certfile); | |
735 | } | |
736 | ||
737 | if (keyfile != NULL) | |
738 | { | |
739 | if (!SSL_CTX_use_PrivateKey_file(ctx, keyfile, SSL_FILETYPE_PEM)) | |
740 | { | |
741 | printf("SSL_CTX_use_PrivateKey_file failed\n"); | |
742 | exit(1); | |
743 | } | |
744 | printf("Key file = %s\n", keyfile); | |
745 | } | |
746 | ||
747 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); | |
748 | SSL_CTX_set_timeout(ctx, 200); | |
749 | SSL_CTX_set_info_callback(ctx, (void (*)())info_callback); | |
750 | #endif | |
751 | ||
752 | ||
753 | /* --------------- Set up for GnuTLS --------------- */ | |
754 | ||
755 | #ifdef HAVE_GNUTLS | |
756 | if (certfile != NULL) printf("Certificate file = %s\n", certfile); | |
757 | if (keyfile != NULL) printf("Key file = %s\n", keyfile); | |
758 | tls_init(certfile, keyfile); | |
759 | tls_session = tls_session_init(); | |
760 | gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr)sock); | |
761 | ||
762 | /* When the server asks for a certificate and the client does not have one, | |
763 | there is a SIGPIPE error in the gnutls_handshake() function for some reason | |
764 | that is not understood. As luck would have it, this has never hit Exim itself | |
765 | because it ignores SIGPIPE errors. Doing the same here allows it all to work as | |
766 | one wants. */ | |
767 | ||
768 | signal(SIGPIPE, SIG_IGN); | |
769 | #endif | |
770 | ||
771 | /* ---------------------------------------------- */ | |
772 | ||
773 | ||
774 | /* Start TLS session if configured to do so without STARTTLS */ | |
775 | ||
776 | #ifdef HAVE_TLS | |
777 | if (tls_on_connect) | |
778 | { | |
779 | printf("Attempting to start TLS\n"); | |
780 | ||
781 | #ifdef HAVE_OPENSSL | |
782 | tls_active = tls_start(sock, &ssl, ctx); | |
783 | #endif | |
784 | ||
785 | #ifdef HAVE_GNUTLS | |
786 | sigalrm_seen = FALSE; | |
787 | alarm(timeout); | |
788 | tls_active = gnutls_handshake(tls_session) >= 0; | |
789 | alarm(0); | |
790 | #endif | |
791 | ||
792 | if (!tls_active) | |
793 | printf("Failed to start TLS\n"); | |
794 | else | |
795 | printf("Succeeded in starting TLS\n"); | |
796 | } | |
797 | #endif | |
798 | ||
799 | while (fgets(outbuffer, sizeof(outbuffer), stdin) != NULL) | |
800 | { | |
801 | int n = (int)strlen(outbuffer); | |
802 | while (n > 0 && isspace(outbuffer[n-1])) n--; | |
803 | outbuffer[n] = 0; | |
804 | ||
805 | /* Expect incoming */ | |
806 | ||
807 | if (strncmp(outbuffer, "??? ", 4) == 0) | |
808 | { | |
809 | unsigned char *lineptr; | |
810 | printf("%s\n", outbuffer); | |
811 | ||
812 | if (*inptr == 0) /* Refill input buffer */ | |
813 | { | |
814 | if (tls_active) | |
815 | { | |
816 | #ifdef HAVE_OPENSSL | |
817 | rc = SSL_read (ssl, inbuffer, sizeof(inbuffer) - 1); | |
818 | #endif | |
819 | #ifdef HAVE_GNUTLS | |
820 | rc = gnutls_record_recv(tls_session, CS inbuffer, sizeof(inbuffer) - 1); | |
821 | #endif | |
822 | } | |
823 | else | |
824 | { | |
825 | alarm(timeout); | |
826 | rc = read(sock, inbuffer, sizeof(inbuffer)); | |
827 | alarm(0); | |
828 | } | |
829 | ||
830 | if (rc < 0) | |
831 | { | |
832 | printf("Read error %s\n", strerror(errno)); | |
833 | exit(1) ; | |
834 | } | |
835 | else if (rc == 0) | |
836 | { | |
837 | printf("Unexpected EOF read\n"); | |
838 | close(sock); | |
839 | exit(1); | |
840 | } | |
841 | else | |
842 | { | |
843 | inbuffer[rc] = 0; | |
844 | inptr = inbuffer; | |
845 | } | |
846 | } | |
847 | ||
848 | lineptr = inptr; | |
849 | while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++; | |
850 | if (*inptr != 0) | |
851 | { | |
852 | *inptr++ = 0; | |
853 | if (*inptr == '\n') inptr++; | |
854 | } | |
855 | ||
856 | printf("<<< %s\n", lineptr); | |
857 | if (strncmp(lineptr, outbuffer + 4, (int)strlen(outbuffer) - 4) != 0) | |
858 | { | |
859 | printf("\n******** Input mismatch ********\n"); | |
860 | exit(1); | |
861 | } | |
862 | ||
863 | #ifdef HAVE_TLS | |
864 | if (sent_starttls) | |
865 | { | |
866 | if (lineptr[0] == '2') | |
867 | { | |
868 | printf("Attempting to start TLS\n"); | |
869 | fflush(stdout); | |
870 | ||
871 | #ifdef HAVE_OPENSSL | |
872 | tls_active = tls_start(sock, &ssl, ctx); | |
873 | #endif | |
874 | ||
875 | #ifdef HAVE_GNUTLS | |
876 | sigalrm_seen = FALSE; | |
877 | alarm(timeout); | |
878 | tls_active = gnutls_handshake(tls_session) >= 0; | |
879 | alarm(0); | |
880 | #endif | |
881 | ||
882 | if (!tls_active) | |
883 | { | |
884 | printf("Failed to start TLS\n"); | |
885 | fflush(stdout); | |
886 | } | |
887 | else | |
888 | printf("Succeeded in starting TLS\n"); | |
889 | } | |
890 | else printf("Abandoning TLS start attempt\n"); | |
891 | } | |
892 | sent_starttls = 0; | |
893 | #endif | |
894 | } | |
895 | ||
896 | /* Wait for a bit before proceeding */ | |
897 | ||
898 | else if (strncmp(outbuffer, "+++ ", 4) == 0) | |
899 | { | |
900 | printf("%s\n", outbuffer); | |
901 | sleep(atoi(outbuffer + 4)); | |
902 | } | |
903 | ||
904 | /* Send outgoing, but barf if unconsumed incoming */ | |
905 | ||
906 | else | |
907 | { | |
908 | unsigned char *escape; | |
909 | ||
910 | if (*inptr != 0) | |
911 | { | |
912 | printf("Unconsumed input: %s", inptr); | |
913 | printf(" About to send: %s\n", outbuffer); | |
914 | exit(1); | |
915 | } | |
916 | ||
917 | #ifdef HAVE_TLS | |
918 | ||
919 | /* Shutdown TLS */ | |
920 | ||
921 | if (strcmp(outbuffer, "stoptls") == 0 || | |
922 | strcmp(outbuffer, "STOPTLS") == 0) | |
923 | { | |
924 | if (!tls_active) | |
925 | { | |
926 | printf("STOPTLS read when TLS not active\n"); | |
927 | exit(1); | |
928 | } | |
929 | printf("Shutting down TLS encryption\n"); | |
930 | ||
931 | #ifdef HAVE_OPENSSL | |
932 | SSL_shutdown(ssl); | |
933 | SSL_free(ssl); | |
934 | #endif | |
935 | ||
936 | #ifdef HAVE_GNUTLS | |
937 | gnutls_bye(tls_session, GNUTLS_SHUT_WR); | |
938 | gnutls_deinit(tls_session); | |
939 | tls_session = NULL; | |
940 | gnutls_global_deinit(); | |
941 | #endif | |
942 | ||
943 | tls_active = 0; | |
944 | continue; | |
945 | } | |
946 | ||
947 | /* Remember that we sent STARTTLS */ | |
948 | ||
949 | sent_starttls = (strcmp(outbuffer, "starttls") == 0 || | |
950 | strcmp(outbuffer, "STARTTLS") == 0); | |
951 | ||
952 | /* Fudge: if the command is "starttls_wait", we send the starttls bit, | |
953 | but we haven't set the flag, so that there is no negotiation. This is for | |
954 | testing the server's timeout. */ | |
955 | ||
956 | if (strcmp(outbuffer, "starttls_wait") == 0) | |
957 | { | |
958 | outbuffer[8] = 0; | |
959 | n = 8; | |
960 | } | |
961 | #endif | |
962 | ||
963 | printf(">>> %s\n", outbuffer); | |
964 | strcpy(outbuffer + n, "\r\n"); | |
965 | ||
966 | /* Turn "\n" and "\r" into the relevant characters. This is a hack. */ | |
967 | ||
968 | while ((escape = strstr(outbuffer, "\\r")) != NULL) | |
969 | { | |
970 | *escape = '\r'; | |
971 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); | |
972 | n--; | |
973 | } | |
974 | ||
975 | while ((escape = strstr(outbuffer, "\\n")) != NULL) | |
976 | { | |
977 | *escape = '\n'; | |
978 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); | |
979 | n--; | |
980 | } | |
981 | ||
982 | /* OK, do it */ | |
983 | ||
984 | alarm(timeout); | |
985 | if (tls_active) | |
986 | { | |
987 | #ifdef HAVE_OPENSSL | |
988 | rc = SSL_write (ssl, outbuffer, n + 2); | |
989 | #endif | |
990 | #ifdef HAVE_GNUTLS | |
991 | rc = gnutls_record_send(tls_session, CS outbuffer, n + 2); | |
992 | if (rc < 0) | |
993 | { | |
994 | printf("GnuTLS write error: %s\n", gnutls_strerror(rc)); | |
995 | exit(1); | |
996 | } | |
997 | #endif | |
998 | } | |
999 | else | |
1000 | { | |
1001 | rc = write(sock, outbuffer, n + 2); | |
1002 | } | |
1003 | alarm(0); | |
1004 | ||
1005 | if (rc < 0) | |
1006 | { | |
1007 | printf("Write error: %s\n", strerror(errno)); | |
1008 | exit(1); | |
1009 | } | |
1010 | } | |
1011 | } | |
1012 | ||
1013 | printf("End of script\n"); | |
1014 | close(sock); | |
1015 | ||
1016 | exit(0); | |
1017 | } | |
1018 | ||
1019 | /* End of client.c */ |