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 | |
2b4a568d JH |
4 | those was hacked out of Exim itself, then code for OpenSSL OCSP stapling was |
5 | ripped 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 | 70 | #include <openssl/ocsp.h> |
c55a77db PH |
71 | #endif |
72 | ||
73 | ||
74 | #ifdef HAVE_GNUTLS | |
75 | #define HAVE_TLS | |
76 | #include <gnutls/gnutls.h> | |
77 | #include <gnutls/x509.h> | |
2b4a568d | 78 | #include <gnutls/ocsp.h> |
c55a77db PH |
79 | |
80 | #define DH_BITS 768 | |
c55a77db PH |
81 | |
82 | /* Local static variables for GNUTLS */ | |
83 | ||
c55a77db PH |
84 | static gnutls_dh_params dh_params = NULL; |
85 | ||
86 | static gnutls_certificate_credentials_t x509_cred = NULL; | |
87 | static gnutls_session tls_session = NULL; | |
88 | ||
89 | static int ssl_session_timeout = 200; | |
90 | ||
91 | /* Priorities for TLS algorithms to use. */ | |
92 | ||
93 | static const int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 }; | |
94 | ||
95 | static const int kx_priority[16] = { | |
96 | GNUTLS_KX_RSA, | |
97 | GNUTLS_KX_DHE_DSS, | |
98 | GNUTLS_KX_DHE_RSA, | |
c55a77db PH |
99 | 0 }; |
100 | ||
101 | static int default_cipher_priority[16] = { | |
102 | GNUTLS_CIPHER_AES_256_CBC, | |
103 | GNUTLS_CIPHER_AES_128_CBC, | |
104 | GNUTLS_CIPHER_3DES_CBC, | |
105 | GNUTLS_CIPHER_ARCFOUR_128, | |
106 | 0 }; | |
107 | ||
108 | static const int mac_priority[16] = { | |
109 | GNUTLS_MAC_SHA, | |
110 | GNUTLS_MAC_MD5, | |
111 | 0 }; | |
112 | ||
113 | static const int comp_priority[16] = { GNUTLS_COMP_NULL, 0 }; | |
114 | static const int cert_type_priority[16] = { GNUTLS_CRT_X509, 0 }; | |
115 | ||
116 | #endif | |
117 | ||
118 | ||
119 | ||
2b4a568d JH |
120 | #ifdef HAVE_TLS |
121 | char * ocsp_stapling = NULL; | |
122 | #endif | |
123 | ||
c55a77db PH |
124 | |
125 | /************************************************* | |
126 | * SIGALRM handler - crash out * | |
127 | *************************************************/ | |
128 | ||
129 | static void | |
130 | sigalrm_handler_crash(int sig) | |
131 | { | |
132 | sig = sig; /* Keep picky compilers happy */ | |
133 | printf("\nClient timed out\n"); | |
134 | exit(99); | |
135 | } | |
136 | ||
137 | ||
138 | /************************************************* | |
139 | * SIGALRM handler - set flag * | |
140 | *************************************************/ | |
141 | ||
142 | static void | |
143 | sigalrm_handler_flag(int sig) | |
144 | { | |
145 | sig = sig; /* Keep picky compilers happy */ | |
146 | sigalrm_seen = 1; | |
147 | } | |
148 | ||
149 | ||
150 | ||
151 | /****************************************************************************/ | |
152 | /****************************************************************************/ | |
153 | ||
154 | #ifdef HAVE_OPENSSL | |
f5d78688 JH |
155 | |
156 | X509_STORE * | |
157 | setup_verify(BIO *bp, char *CAfile, char *CApath) | |
158 | { | |
159 | X509_STORE *store; | |
160 | X509_LOOKUP *lookup; | |
161 | if(!(store = X509_STORE_new())) goto end; | |
162 | lookup=X509_STORE_add_lookup(store,X509_LOOKUP_file()); | |
163 | if (lookup == NULL) goto end; | |
164 | if (CAfile) { | |
165 | if(!X509_LOOKUP_load_file(lookup,CAfile,X509_FILETYPE_PEM)) { | |
166 | BIO_printf(bp, "Error loading file %s\n", CAfile); | |
167 | goto end; | |
168 | } | |
169 | } else X509_LOOKUP_load_file(lookup,NULL,X509_FILETYPE_DEFAULT); | |
170 | ||
171 | lookup=X509_STORE_add_lookup(store,X509_LOOKUP_hash_dir()); | |
172 | if (lookup == NULL) goto end; | |
173 | if (CApath) { | |
174 | if(!X509_LOOKUP_add_dir(lookup,CApath,X509_FILETYPE_PEM)) { | |
175 | BIO_printf(bp, "Error loading directory %s\n", CApath); | |
176 | goto end; | |
177 | } | |
178 | } else X509_LOOKUP_add_dir(lookup,NULL,X509_FILETYPE_DEFAULT); | |
179 | ||
180 | ERR_clear_error(); | |
181 | return store; | |
182 | end: | |
183 | X509_STORE_free(store); | |
184 | return NULL; | |
185 | } | |
186 | ||
187 | ||
188 | static int | |
189 | tls_client_stapling_cb(SSL *s, void *arg) | |
190 | { | |
191 | const unsigned char *p; | |
192 | int len; | |
193 | OCSP_RESPONSE *rsp; | |
194 | OCSP_BASICRESP *bs; | |
195 | char *CAfile = NULL; | |
196 | X509_STORE *store = NULL; | |
197 | int ret = 1; | |
198 | ||
199 | len = SSL_get_tlsext_status_ocsp_resp(s, &p); | |
200 | /*BIO_printf(arg, "OCSP response: ");*/ | |
201 | if (!p) | |
202 | { | |
203 | BIO_printf(arg, "no response received\n"); | |
204 | return 1; | |
205 | } | |
206 | if(!(rsp = d2i_OCSP_RESPONSE(NULL, &p, len))) | |
207 | { | |
208 | BIO_printf(arg, "response parse error\n"); | |
209 | BIO_dump_indent(arg, (char *)p, len, 4); | |
210 | return 0; | |
211 | } | |
212 | if(!(bs = OCSP_response_get1_basic(rsp))) | |
213 | { | |
214 | BIO_printf(arg, "error parsing response\n"); | |
215 | return 0; | |
216 | } | |
217 | ||
218 | CAfile = ocsp_stapling; | |
219 | if(!(store = setup_verify(arg, CAfile, NULL))) | |
220 | { | |
221 | BIO_printf(arg, "error in cert setup\n"); | |
222 | return 0; | |
223 | } | |
224 | ||
225 | /* No file of alternate certs, no options */ | |
226 | if(OCSP_basic_verify(bs, NULL, store, 0) <= 0) | |
227 | { | |
228 | BIO_printf(arg, "Response Verify Failure\n"); | |
229 | ERR_print_errors(arg); | |
230 | ret = 0; | |
231 | } | |
232 | else | |
233 | BIO_printf(arg, "Response verify OK\n"); | |
234 | ||
235 | X509_STORE_free(store); | |
236 | return ret; | |
237 | } | |
238 | ||
239 | ||
c55a77db PH |
240 | /************************************************* |
241 | * Start an OpenSSL TLS session * | |
242 | *************************************************/ | |
243 | ||
2b4a568d JH |
244 | int |
245 | tls_start(int sock, SSL **ssl, SSL_CTX *ctx) | |
c55a77db PH |
246 | { |
247 | int rc; | |
248 | static const char *sid_ctx = "exim"; | |
249 | ||
250 | RAND_load_file("client.c", -1); /* Not *very* random! */ | |
251 | ||
252 | *ssl = SSL_new (ctx); | |
253 | SSL_set_session_id_context(*ssl, sid_ctx, strlen(sid_ctx)); | |
254 | SSL_set_fd (*ssl, sock); | |
255 | SSL_set_connect_state(*ssl); | |
256 | ||
f5d78688 JH |
257 | if (ocsp_stapling) |
258 | { | |
259 | SSL_CTX_set_tlsext_status_cb(ctx, tls_client_stapling_cb); | |
260 | SSL_CTX_set_tlsext_status_arg(ctx, BIO_new_fp(stdout, BIO_NOCLOSE)); | |
261 | SSL_set_tlsext_status_type(*ssl, TLSEXT_STATUSTYPE_ocsp); | |
262 | } | |
263 | ||
c55a77db PH |
264 | signal(SIGALRM, sigalrm_handler_flag); |
265 | sigalrm_seen = 0; | |
266 | alarm(5); | |
267 | rc = SSL_connect (*ssl); | |
268 | alarm(0); | |
269 | ||
270 | if (sigalrm_seen) | |
271 | { | |
272 | printf("SSL_connect timed out\n"); | |
273 | return 0; | |
274 | } | |
275 | ||
276 | if (rc <= 0) | |
277 | { | |
278 | ERR_print_errors_fp(stdout); | |
279 | return 0; | |
280 | } | |
281 | ||
282 | printf("SSL connection using %s\n", SSL_get_cipher (*ssl)); | |
283 | return 1; | |
284 | } | |
285 | ||
286 | ||
287 | /************************************************* | |
288 | * SSL Information callback * | |
289 | *************************************************/ | |
290 | ||
291 | static void | |
292 | info_callback(SSL *s, int where, int ret) | |
293 | { | |
294 | where = where; | |
295 | ret = ret; | |
296 | printf("SSL info: %s\n", SSL_state_string_long(s)); | |
297 | } | |
298 | #endif | |
299 | ||
300 | ||
301 | /****************************************************************************/ | |
302 | /****************************************************************************/ | |
303 | ||
304 | ||
305 | #ifdef HAVE_GNUTLS | |
306 | /************************************************* | |
307 | * Handle GnuTLS error * | |
308 | *************************************************/ | |
309 | ||
310 | /* Called from lots of places when errors occur before actually starting to do | |
311 | the TLS handshake, that is, while the session is still in clear. | |
312 | ||
313 | Argument: | |
314 | prefix prefix text | |
315 | err a GnuTLS error number, or 0 if local error | |
316 | ||
317 | Returns: doesn't - it dies | |
318 | */ | |
319 | ||
320 | static void | |
321 | gnutls_error(uschar *prefix, int err) | |
322 | { | |
bb727765 | 323 | fprintf(stderr, "GnuTLS connection error: %s:", prefix); |
c55a77db PH |
324 | if (err != 0) fprintf(stderr, " %s", gnutls_strerror(err)); |
325 | fprintf(stderr, "\n"); | |
326 | exit(1); | |
327 | } | |
328 | ||
329 | ||
330 | ||
331 | /************************************************* | |
bb727765 | 332 | * Setup up DH parameters * |
c55a77db PH |
333 | *************************************************/ |
334 | ||
335 | /* For the test suite, the parameters should always be available in the spool | |
336 | directory. */ | |
337 | ||
338 | static void | |
bb727765 | 339 | init_dh(void) |
c55a77db PH |
340 | { |
341 | int fd; | |
342 | int ret; | |
343 | gnutls_datum m; | |
344 | uschar filename[200]; | |
345 | struct stat statbuf; | |
346 | ||
347 | /* Initialize the data structures for holding the parameters */ | |
348 | ||
c55a77db PH |
349 | ret = gnutls_dh_params_init(&dh_params); |
350 | if (ret < 0) gnutls_error(US"init dh_params", ret); | |
351 | ||
352 | /* Open the cache file for reading and if successful, read it and set up the | |
bb727765 | 353 | parameters. */ |
c55a77db PH |
354 | |
355 | fd = open("aux-fixed/gnutls-params", O_RDONLY, 0); | |
356 | if (fd < 0) | |
357 | { | |
358 | fprintf(stderr, "Failed to open spool/gnutls-params: %s\n", strerror(errno)); | |
359 | exit(1); | |
360 | } | |
361 | ||
362 | if (fstat(fd, &statbuf) < 0) | |
363 | { | |
364 | (void)close(fd); | |
365 | return gnutls_error(US"TLS cache stat failed", 0); | |
366 | } | |
367 | ||
368 | m.size = statbuf.st_size; | |
369 | m.data = malloc(m.size); | |
370 | if (m.data == NULL) | |
371 | return gnutls_error(US"memory allocation failed", 0); | |
372 | if (read(fd, m.data, m.size) != m.size) | |
373 | return gnutls_error(US"TLS cache read failed", 0); | |
374 | (void)close(fd); | |
375 | ||
c55a77db PH |
376 | ret = gnutls_dh_params_import_pkcs3(dh_params, &m, GNUTLS_X509_FMT_PEM); |
377 | if (ret < 0) return gnutls_error(US"DH params import", ret); | |
378 | free(m.data); | |
379 | } | |
380 | ||
381 | ||
382 | ||
383 | ||
384 | /************************************************* | |
385 | * Initialize for GnuTLS * | |
386 | *************************************************/ | |
387 | ||
388 | /* | |
389 | Arguments: | |
390 | certificate certificate file | |
391 | privatekey private key file | |
392 | */ | |
393 | ||
394 | static void | |
395 | tls_init(uschar *certificate, uschar *privatekey) | |
396 | { | |
397 | int rc; | |
398 | ||
399 | rc = gnutls_global_init(); | |
400 | if (rc < 0) gnutls_error(US"gnutls_global_init", rc); | |
401 | ||
bb727765 | 402 | /* Read D-H parameters from the cache file. */ |
c55a77db | 403 | |
bb727765 | 404 | init_dh(); |
c55a77db PH |
405 | |
406 | /* Create the credentials structure */ | |
407 | ||
408 | rc = gnutls_certificate_allocate_credentials(&x509_cred); | |
409 | if (rc < 0) gnutls_error(US"certificate_allocate_credentials", rc); | |
410 | ||
411 | /* Set the certificate and private keys */ | |
412 | ||
413 | if (certificate != NULL) | |
414 | { | |
415 | rc = gnutls_certificate_set_x509_key_file(x509_cred, CS certificate, | |
416 | CS privatekey, GNUTLS_X509_FMT_PEM); | |
417 | if (rc < 0) gnutls_error("gnutls_certificate", rc); | |
418 | } | |
419 | ||
420 | /* Associate the parameters with the x509 credentials structure. */ | |
421 | ||
422 | gnutls_certificate_set_dh_params(x509_cred, dh_params); | |
2b4a568d JH |
423 | |
424 | /* set the CA info for server-cert verify */ | |
425 | if (ocsp_stapling) | |
426 | gnutls_certificate_set_x509_trust_file(x509_cred, ocsp_stapling, | |
427 | GNUTLS_X509_FMT_PEM); | |
c55a77db PH |
428 | } |
429 | ||
430 | ||
431 | ||
432 | /************************************************* | |
433 | * Initialize a single GNUTLS session * | |
434 | *************************************************/ | |
435 | ||
436 | static gnutls_session | |
437 | tls_session_init(void) | |
438 | { | |
439 | gnutls_session session; | |
440 | ||
441 | gnutls_init(&session, GNUTLS_CLIENT); | |
442 | ||
443 | gnutls_cipher_set_priority(session, default_cipher_priority); | |
444 | gnutls_compression_set_priority(session, comp_priority); | |
445 | gnutls_kx_set_priority(session, kx_priority); | |
446 | gnutls_protocol_set_priority(session, protocol_priority); | |
447 | gnutls_mac_set_priority(session, mac_priority); | |
448 | ||
449 | gnutls_cred_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred); | |
450 | ||
451 | gnutls_dh_set_prime_bits(session, DH_BITS); | |
452 | gnutls_db_set_cache_expiration(session, ssl_session_timeout); | |
453 | ||
454 | return session; | |
455 | } | |
456 | #endif | |
457 | ||
458 | ||
459 | /****************************************************************************/ | |
460 | /****************************************************************************/ | |
461 | ||
462 | ||
463 | ||
464 | ||
465 | /************************************************* | |
466 | * Main Program * | |
467 | *************************************************/ | |
468 | ||
4fe99a6c PP |
469 | const char * const HELP_MESSAGE = "\n\ |
470 | Usage: client\n\ | |
471 | <IP address>\n\ | |
472 | <port>\n\ | |
473 | [<outgoing interface>]\n\ | |
474 | [<cert file>]\n\ | |
475 | [<key file>]\n\ | |
476 | \n"; | |
c55a77db PH |
477 | |
478 | int main(int argc, char **argv) | |
479 | { | |
480 | struct sockaddr *s_ptr; | |
481 | struct sockaddr_in s_in4; | |
482 | char *interface = NULL; | |
483 | char *address = NULL; | |
484 | char *certfile = NULL; | |
485 | char *keyfile = NULL; | |
1ec3f27d | 486 | char *end = NULL; |
c55a77db PH |
487 | int argi = 1; |
488 | int host_af, port, s_len, rc, sock, save_errno; | |
489 | int timeout = 1; | |
490 | int tls_active = 0; | |
491 | int sent_starttls = 0; | |
492 | int tls_on_connect = 0; | |
1ec3f27d | 493 | long tmplong; |
c55a77db PH |
494 | |
495 | #if HAVE_IPV6 | |
496 | struct sockaddr_in6 s_in6; | |
497 | #endif | |
498 | ||
499 | #ifdef HAVE_OPENSSL | |
500 | SSL_CTX* ctx; | |
501 | SSL* ssl; | |
502 | #endif | |
503 | ||
504 | unsigned char outbuffer[10240]; | |
505 | unsigned char inbuffer[10240]; | |
506 | unsigned char *inptr = inbuffer; | |
507 | ||
508 | *inptr = 0; /* Buffer empty */ | |
509 | ||
510 | /* Options */ | |
511 | ||
512 | while (argc >= argi + 1 && argv[argi][0] == '-') | |
513 | { | |
4fe99a6c PP |
514 | if (strcmp(argv[argi], "-help") == 0 || |
515 | strcmp(argv[argi], "--help") == 0 || | |
516 | strcmp(argv[argi], "-h") == 0) | |
517 | { | |
518 | printf(HELP_MESSAGE); | |
519 | exit(0); | |
520 | } | |
c55a77db PH |
521 | if (strcmp(argv[argi], "-tls-on-connect") == 0) |
522 | { | |
523 | tls_on_connect = 1; | |
524 | argi++; | |
525 | } | |
2b4a568d | 526 | #ifdef HAVE_TLS |
f5d78688 JH |
527 | else if (strcmp(argv[argi], "-ocsp") == 0) |
528 | { | |
529 | if (argc < ++argi + 1) | |
530 | { | |
531 | fprintf(stderr, "Missing required certificate file for ocsp option\n"); | |
532 | exit(1); | |
533 | } | |
534 | ocsp_stapling = argv[argi++]; | |
535 | } | |
2b4a568d | 536 | |
f5d78688 | 537 | #endif |
c55a77db PH |
538 | else if (argv[argi][1] == 't' && isdigit(argv[argi][2])) |
539 | { | |
1ec3f27d PP |
540 | tmplong = strtol(argv[argi]+2, &end, 10); |
541 | if (end == argv[argi]+2 || *end) | |
542 | { | |
543 | fprintf(stderr, "Failed to parse seconds from option <%s>\n", | |
544 | argv[argi]); | |
545 | exit(1); | |
546 | } | |
547 | if (tmplong > 10000L) | |
548 | { | |
549 | fprintf(stderr, "Unreasonably long wait of %d seconds requested\n", | |
550 | tmplong); | |
551 | exit(1); | |
552 | } | |
553 | if (tmplong < 0L) | |
554 | { | |
555 | fprintf(stderr, "Timeout must not be negative (%d)\n", tmplong); | |
556 | exit(1); | |
557 | } | |
558 | timeout = (int) tmplong; | |
c55a77db PH |
559 | argi++; |
560 | } | |
561 | else | |
562 | { | |
1ec3f27d | 563 | fprintf(stderr, "Unrecognized option %s\n", argv[argi]); |
c55a77db PH |
564 | exit(1); |
565 | } | |
566 | } | |
567 | ||
568 | /* Mandatory 1st arg is IP address */ | |
569 | ||
570 | if (argc < argi+1) | |
571 | { | |
1ec3f27d | 572 | fprintf(stderr, "No IP address given\n"); |
c55a77db PH |
573 | exit(1); |
574 | } | |
575 | ||
576 | address = argv[argi++]; | |
577 | host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET; | |
578 | ||
579 | /* Mandatory 2nd arg is port */ | |
580 | ||
581 | if (argc < argi+1) | |
582 | { | |
1ec3f27d | 583 | fprintf(stderr, "No port number given\n"); |
c55a77db PH |
584 | exit(1); |
585 | } | |
586 | ||
587 | port = atoi(argv[argi++]); | |
588 | ||
589 | /* Optional next arg is interface */ | |
590 | ||
591 | if (argc > argi && | |
592 | (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':')) | |
593 | interface = argv[argi++]; | |
594 | ||
595 | /* Any more arguments are the name of a certificate file and key file */ | |
596 | ||
597 | if (argc > argi) certfile = argv[argi++]; | |
598 | if (argc > argi) keyfile = argv[argi++]; | |
599 | ||
600 | ||
601 | #if HAVE_IPV6 | |
602 | /* For an IPv6 address, use an IPv6 sockaddr structure. */ | |
603 | ||
604 | if (host_af == AF_INET6) | |
605 | { | |
606 | s_ptr = (struct sockaddr *)&s_in6; | |
607 | s_len = sizeof(s_in6); | |
608 | } | |
609 | else | |
610 | #endif | |
611 | ||
612 | /* For an IPv4 address, use an IPv4 sockaddr structure, | |
613 | even on an IPv6 system. */ | |
614 | ||
615 | { | |
616 | s_ptr = (struct sockaddr *)&s_in4; | |
617 | s_len = sizeof(s_in4); | |
618 | } | |
619 | ||
620 | printf("Connecting to %s port %d ... ", address, port); | |
621 | ||
622 | sock = socket(host_af, SOCK_STREAM, 0); | |
623 | if (sock < 0) | |
624 | { | |
625 | printf("socket creation failed: %s\n", strerror(errno)); | |
626 | exit(1); | |
627 | } | |
628 | ||
629 | /* Bind to a specific interface if requested. On an IPv6 system, this has | |
630 | to be of the same family as the address we are calling. On an IPv4 system the | |
631 | test is redundant, but it keeps the code tidier. */ | |
632 | ||
633 | if (interface != NULL) | |
634 | { | |
635 | int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET; | |
636 | ||
637 | if (interface_af == host_af) | |
638 | { | |
639 | #if HAVE_IPV6 | |
640 | ||
641 | /* Set up for IPv6 binding */ | |
642 | ||
643 | if (host_af == AF_INET6) | |
644 | { | |
645 | memset(&s_in6, 0, sizeof(s_in6)); | |
646 | s_in6.sin6_family = AF_INET6; | |
647 | s_in6.sin6_port = 0; | |
648 | if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1) | |
649 | { | |
650 | printf("Unable to parse \"%s\"", interface); | |
651 | exit(1); | |
652 | } | |
653 | } | |
654 | else | |
655 | #endif | |
656 | ||
657 | /* Set up for IPv4 binding */ | |
658 | ||
659 | { | |
660 | memset(&s_in4, 0, sizeof(s_in4)); | |
661 | s_in4.sin_family = AF_INET; | |
662 | s_in4.sin_port = 0; | |
663 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface); | |
664 | } | |
665 | ||
666 | /* Bind */ | |
667 | ||
668 | if (bind(sock, s_ptr, s_len) < 0) | |
669 | { | |
670 | printf("Unable to bind outgoing SMTP call to %s: %s", | |
671 | interface, strerror(errno)); | |
672 | exit(1); | |
673 | } | |
674 | } | |
675 | } | |
676 | ||
677 | /* Set up a remote IPv6 address */ | |
678 | ||
679 | #if HAVE_IPV6 | |
680 | if (host_af == AF_INET6) | |
681 | { | |
682 | memset(&s_in6, 0, sizeof(s_in6)); | |
683 | s_in6.sin6_family = AF_INET6; | |
684 | s_in6.sin6_port = htons(port); | |
685 | if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1) | |
686 | { | |
687 | printf("Unable to parse \"%s\"", address); | |
688 | exit(1); | |
689 | } | |
690 | } | |
691 | else | |
692 | #endif | |
693 | ||
694 | /* Set up a remote IPv4 address */ | |
695 | ||
696 | { | |
697 | memset(&s_in4, 0, sizeof(s_in4)); | |
698 | s_in4.sin_family = AF_INET; | |
699 | s_in4.sin_port = htons(port); | |
700 | s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address); | |
701 | } | |
702 | ||
703 | /* SIGALRM handler crashes out */ | |
704 | ||
705 | signal(SIGALRM, sigalrm_handler_crash); | |
706 | alarm(timeout); | |
707 | rc = connect(sock, s_ptr, s_len); | |
708 | save_errno = errno; | |
709 | alarm(0); | |
710 | ||
711 | /* A failure whose error code is "Interrupted system call" is in fact | |
712 | an externally applied timeout if the signal handler has been run. */ | |
713 | ||
714 | if (rc < 0) | |
715 | { | |
716 | close(sock); | |
717 | printf("failed: %s\n", strerror(save_errno)); | |
718 | exit(1); | |
719 | } | |
720 | ||
721 | printf("connected\n"); | |
722 | ||
723 | ||
724 | /* --------------- Set up for OpenSSL --------------- */ | |
725 | ||
726 | #ifdef HAVE_OPENSSL | |
727 | SSL_library_init(); | |
728 | SSL_load_error_strings(); | |
729 | ||
730 | ctx = SSL_CTX_new(SSLv23_method()); | |
731 | if (ctx == NULL) | |
732 | { | |
733 | printf ("SSL_CTX_new failed\n"); | |
734 | exit(1); | |
735 | } | |
736 | ||
737 | if (certfile != NULL) | |
738 | { | |
739 | if (!SSL_CTX_use_certificate_file(ctx, certfile, SSL_FILETYPE_PEM)) | |
740 | { | |
741 | printf("SSL_CTX_use_certificate_file failed\n"); | |
742 | exit(1); | |
743 | } | |
744 | printf("Certificate file = %s\n", certfile); | |
745 | } | |
746 | ||
747 | if (keyfile != NULL) | |
748 | { | |
749 | if (!SSL_CTX_use_PrivateKey_file(ctx, keyfile, SSL_FILETYPE_PEM)) | |
750 | { | |
751 | printf("SSL_CTX_use_PrivateKey_file failed\n"); | |
752 | exit(1); | |
753 | } | |
754 | printf("Key file = %s\n", keyfile); | |
755 | } | |
756 | ||
757 | SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_BOTH); | |
758 | SSL_CTX_set_timeout(ctx, 200); | |
759 | SSL_CTX_set_info_callback(ctx, (void (*)())info_callback); | |
760 | #endif | |
761 | ||
762 | ||
763 | /* --------------- Set up for GnuTLS --------------- */ | |
764 | ||
765 | #ifdef HAVE_GNUTLS | |
766 | if (certfile != NULL) printf("Certificate file = %s\n", certfile); | |
767 | if (keyfile != NULL) printf("Key file = %s\n", keyfile); | |
768 | tls_init(certfile, keyfile); | |
769 | tls_session = tls_session_init(); | |
2b4a568d JH |
770 | if (ocsp_stapling) |
771 | gnutls_ocsp_status_request_enable_client(tls_session, NULL, 0, NULL); | |
c55a77db PH |
772 | gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr)sock); |
773 | ||
774 | /* When the server asks for a certificate and the client does not have one, | |
775 | there is a SIGPIPE error in the gnutls_handshake() function for some reason | |
776 | that is not understood. As luck would have it, this has never hit Exim itself | |
777 | because it ignores SIGPIPE errors. Doing the same here allows it all to work as | |
778 | one wants. */ | |
779 | ||
780 | signal(SIGPIPE, SIG_IGN); | |
781 | #endif | |
782 | ||
783 | /* ---------------------------------------------- */ | |
784 | ||
785 | ||
786 | /* Start TLS session if configured to do so without STARTTLS */ | |
787 | ||
788 | #ifdef HAVE_TLS | |
789 | if (tls_on_connect) | |
790 | { | |
791 | printf("Attempting to start TLS\n"); | |
792 | ||
793 | #ifdef HAVE_OPENSSL | |
794 | tls_active = tls_start(sock, &ssl, ctx); | |
795 | #endif | |
796 | ||
797 | #ifdef HAVE_GNUTLS | |
798 | sigalrm_seen = FALSE; | |
799 | alarm(timeout); | |
800 | tls_active = gnutls_handshake(tls_session) >= 0; | |
801 | alarm(0); | |
802 | #endif | |
803 | ||
804 | if (!tls_active) | |
805 | printf("Failed to start TLS\n"); | |
2b4a568d JH |
806 | #ifdef HAVE_GNUTLS |
807 | else if ( ocsp_stapling | |
808 | && gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0) | |
809 | printf("Failed to verify certificate status\n"); | |
810 | #endif | |
c55a77db PH |
811 | else |
812 | printf("Succeeded in starting TLS\n"); | |
813 | } | |
814 | #endif | |
815 | ||
816 | while (fgets(outbuffer, sizeof(outbuffer), stdin) != NULL) | |
817 | { | |
818 | int n = (int)strlen(outbuffer); | |
819 | while (n > 0 && isspace(outbuffer[n-1])) n--; | |
820 | outbuffer[n] = 0; | |
821 | ||
822 | /* Expect incoming */ | |
823 | ||
824 | if (strncmp(outbuffer, "??? ", 4) == 0) | |
825 | { | |
826 | unsigned char *lineptr; | |
827 | printf("%s\n", outbuffer); | |
828 | ||
829 | if (*inptr == 0) /* Refill input buffer */ | |
830 | { | |
831 | if (tls_active) | |
832 | { | |
833 | #ifdef HAVE_OPENSSL | |
834 | rc = SSL_read (ssl, inbuffer, sizeof(inbuffer) - 1); | |
835 | #endif | |
836 | #ifdef HAVE_GNUTLS | |
837 | rc = gnutls_record_recv(tls_session, CS inbuffer, sizeof(inbuffer) - 1); | |
838 | #endif | |
839 | } | |
840 | else | |
841 | { | |
842 | alarm(timeout); | |
843 | rc = read(sock, inbuffer, sizeof(inbuffer)); | |
844 | alarm(0); | |
845 | } | |
846 | ||
847 | if (rc < 0) | |
848 | { | |
849 | printf("Read error %s\n", strerror(errno)); | |
850 | exit(1) ; | |
851 | } | |
852 | else if (rc == 0) | |
853 | { | |
854 | printf("Unexpected EOF read\n"); | |
855 | close(sock); | |
856 | exit(1); | |
857 | } | |
858 | else | |
859 | { | |
860 | inbuffer[rc] = 0; | |
861 | inptr = inbuffer; | |
862 | } | |
863 | } | |
864 | ||
865 | lineptr = inptr; | |
866 | while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++; | |
867 | if (*inptr != 0) | |
868 | { | |
869 | *inptr++ = 0; | |
870 | if (*inptr == '\n') inptr++; | |
871 | } | |
872 | ||
873 | printf("<<< %s\n", lineptr); | |
874 | if (strncmp(lineptr, outbuffer + 4, (int)strlen(outbuffer) - 4) != 0) | |
875 | { | |
876 | printf("\n******** Input mismatch ********\n"); | |
877 | exit(1); | |
878 | } | |
879 | ||
880 | #ifdef HAVE_TLS | |
881 | if (sent_starttls) | |
882 | { | |
883 | if (lineptr[0] == '2') | |
884 | { | |
2b4a568d JH |
885 | int rc; |
886 | unsigned int verify; | |
887 | ||
c55a77db PH |
888 | printf("Attempting to start TLS\n"); |
889 | fflush(stdout); | |
890 | ||
891 | #ifdef HAVE_OPENSSL | |
892 | tls_active = tls_start(sock, &ssl, ctx); | |
893 | #endif | |
894 | ||
895 | #ifdef HAVE_GNUTLS | |
896 | sigalrm_seen = FALSE; | |
897 | alarm(timeout); | |
898 | tls_active = gnutls_handshake(tls_session) >= 0; | |
899 | alarm(0); | |
900 | #endif | |
901 | ||
902 | if (!tls_active) | |
903 | { | |
904 | printf("Failed to start TLS\n"); | |
905 | fflush(stdout); | |
906 | } | |
2b4a568d JH |
907 | #ifdef HAVE_GNUTLS |
908 | else if (ocsp_stapling) | |
909 | { | |
910 | if ((rc= gnutls_certificate_verify_peers2(tls_session, &verify)) < 0) | |
911 | { | |
912 | printf("Failed to verify certificate: %s\n", gnutls_strerror(rc)); | |
913 | fflush(stdout); | |
914 | } | |
915 | else if (verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED)) | |
916 | { | |
917 | printf("Bad certificate\n"); | |
918 | fflush(stdout); | |
919 | } | |
920 | else if (gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0) | |
921 | { | |
922 | printf("Failed to verify certificate status\n"); | |
923 | { | |
924 | gnutls_datum_t stapling; | |
925 | gnutls_ocsp_resp_t resp; | |
926 | gnutls_datum_t printed; | |
927 | if ( (rc= gnutls_ocsp_status_request_get(tls_session, &stapling)) == 0 | |
928 | && (rc= gnutls_ocsp_resp_init(&resp)) == 0 | |
929 | && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0 | |
930 | && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &printed)) == 0 | |
931 | ) | |
932 | { | |
933 | fprintf(stderr, "%.4096s", printed.data); | |
934 | gnutls_free(printed.data); | |
935 | } | |
936 | else | |
937 | (void) fprintf(stderr,"ocsp decode: %s", gnutls_strerror(rc)); | |
938 | } | |
939 | fflush(stdout); | |
940 | } | |
941 | } | |
942 | #endif | |
c55a77db PH |
943 | else |
944 | printf("Succeeded in starting TLS\n"); | |
945 | } | |
946 | else printf("Abandoning TLS start attempt\n"); | |
947 | } | |
948 | sent_starttls = 0; | |
949 | #endif | |
950 | } | |
951 | ||
952 | /* Wait for a bit before proceeding */ | |
953 | ||
954 | else if (strncmp(outbuffer, "+++ ", 4) == 0) | |
955 | { | |
956 | printf("%s\n", outbuffer); | |
957 | sleep(atoi(outbuffer + 4)); | |
958 | } | |
959 | ||
960 | /* Send outgoing, but barf if unconsumed incoming */ | |
961 | ||
962 | else | |
963 | { | |
964 | unsigned char *escape; | |
965 | ||
966 | if (*inptr != 0) | |
967 | { | |
968 | printf("Unconsumed input: %s", inptr); | |
969 | printf(" About to send: %s\n", outbuffer); | |
970 | exit(1); | |
971 | } | |
972 | ||
973 | #ifdef HAVE_TLS | |
974 | ||
975 | /* Shutdown TLS */ | |
976 | ||
977 | if (strcmp(outbuffer, "stoptls") == 0 || | |
978 | strcmp(outbuffer, "STOPTLS") == 0) | |
979 | { | |
980 | if (!tls_active) | |
981 | { | |
982 | printf("STOPTLS read when TLS not active\n"); | |
983 | exit(1); | |
984 | } | |
985 | printf("Shutting down TLS encryption\n"); | |
986 | ||
987 | #ifdef HAVE_OPENSSL | |
988 | SSL_shutdown(ssl); | |
989 | SSL_free(ssl); | |
990 | #endif | |
991 | ||
992 | #ifdef HAVE_GNUTLS | |
993 | gnutls_bye(tls_session, GNUTLS_SHUT_WR); | |
994 | gnutls_deinit(tls_session); | |
995 | tls_session = NULL; | |
996 | gnutls_global_deinit(); | |
997 | #endif | |
998 | ||
999 | tls_active = 0; | |
1000 | continue; | |
1001 | } | |
1002 | ||
1003 | /* Remember that we sent STARTTLS */ | |
1004 | ||
1005 | sent_starttls = (strcmp(outbuffer, "starttls") == 0 || | |
1006 | strcmp(outbuffer, "STARTTLS") == 0); | |
1007 | ||
1008 | /* Fudge: if the command is "starttls_wait", we send the starttls bit, | |
1009 | but we haven't set the flag, so that there is no negotiation. This is for | |
1010 | testing the server's timeout. */ | |
1011 | ||
1012 | if (strcmp(outbuffer, "starttls_wait") == 0) | |
1013 | { | |
1014 | outbuffer[8] = 0; | |
1015 | n = 8; | |
1016 | } | |
1017 | #endif | |
1018 | ||
1019 | printf(">>> %s\n", outbuffer); | |
1020 | strcpy(outbuffer + n, "\r\n"); | |
1021 | ||
1022 | /* Turn "\n" and "\r" into the relevant characters. This is a hack. */ | |
1023 | ||
1024 | while ((escape = strstr(outbuffer, "\\r")) != NULL) | |
1025 | { | |
1026 | *escape = '\r'; | |
1027 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); | |
1028 | n--; | |
1029 | } | |
1030 | ||
1031 | while ((escape = strstr(outbuffer, "\\n")) != NULL) | |
1032 | { | |
1033 | *escape = '\n'; | |
1034 | memmove(escape + 1, escape + 2, (n + 2) - (escape - outbuffer) - 2); | |
1035 | n--; | |
1036 | } | |
1037 | ||
1038 | /* OK, do it */ | |
1039 | ||
1040 | alarm(timeout); | |
1041 | if (tls_active) | |
1042 | { | |
1043 | #ifdef HAVE_OPENSSL | |
1044 | rc = SSL_write (ssl, outbuffer, n + 2); | |
1045 | #endif | |
1046 | #ifdef HAVE_GNUTLS | |
1047 | rc = gnutls_record_send(tls_session, CS outbuffer, n + 2); | |
1048 | if (rc < 0) | |
1049 | { | |
1050 | printf("GnuTLS write error: %s\n", gnutls_strerror(rc)); | |
1051 | exit(1); | |
1052 | } | |
1053 | #endif | |
1054 | } | |
1055 | else | |
1056 | { | |
1057 | rc = write(sock, outbuffer, n + 2); | |
1058 | } | |
1059 | alarm(0); | |
1060 | ||
1061 | if (rc < 0) | |
1062 | { | |
1063 | printf("Write error: %s\n", strerror(errno)); | |
1064 | exit(1); | |
1065 | } | |
1066 | } | |
1067 | } | |
1068 | ||
1069 | printf("End of script\n"); | |
1070 | close(sock); | |
1071 | ||
1072 | exit(0); | |
1073 | } | |
1074 | ||
1075 | /* End of client.c */ |