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
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. */
7 /* ANSI C standard includes */
22 #include <sys/types.h>
24 #include <netinet/in_systm.h>
25 #include <netinet/in.h>
26 #include <netinet/ip.h>
27 #include <netinet/tcp.h>
30 #include <arpa/inet.h>
32 #include <sys/resource.h>
33 #include <sys/socket.h>
39 /* Set to TRUE to enable debug output */
40 #define DEBUG if (FALSE)
47 #define S_ADDR_TYPE u_long
50 typedef unsigned char uschar;
53 #define US (unsigned char *)
60 static int sigalrm_seen = 0;
63 /* TLS support can be optionally included, either for OpenSSL or GnuTLS. The
64 latter needs a whole pile of tables. */
67 # include <openssl/crypto.h>
68 # include <openssl/x509.h>
69 # include <openssl/pem.h>
70 # include <openssl/ssl.h>
71 # include <openssl/err.h>
72 # include <openssl/rand.h>
74 # if OPENSSL_VERSION_NUMBER < 0x0090806fL && !defined(DISABLE_OCSP) && !defined(OPENSSL_NO_TLSEXT)
75 # warning "OpenSSL library version too old; define DISABLE_OCSP in Makefile"
79 # include <openssl/ocsp.h>
86 # include <gnutls/gnutls.h>
87 # include <gnutls/x509.h>
88 # if GNUTLS_VERSION_NUMBER >= 0x030103
90 # include <gnutls/ocsp.h>
92 # ifndef GNUTLS_NO_EXTENSIONS
93 # define GNUTLS_NO_EXTENSIONS 0
98 /* Local static variables for GNUTLS */
100 static gnutls_dh_params_t dh_params = NULL;
102 static gnutls_certificate_credentials_t x509_cred = NULL;
103 static gnutls_session_t tls_session = NULL;
105 static int ssl_session_timeout = 200;
107 /* Priorities for TLS algorithms to use. */
109 # if GNUTLS_VERSION_NUMBER < 0x030400
110 static const int protocol_priority[16] = { GNUTLS_TLS1, GNUTLS_SSL3, 0 };
112 static const int kx_priority[16] = {
118 static int default_cipher_priority[16] = {
119 GNUTLS_CIPHER_AES_256_CBC,
120 GNUTLS_CIPHER_AES_128_CBC,
121 GNUTLS_CIPHER_3DES_CBC,
122 GNUTLS_CIPHER_ARCFOUR_128,
125 static const int mac_priority[16] = {
130 static const int comp_priority[16] = { GNUTLS_COMP_NULL, 0 };
133 #endif /*HAVE_GNUTLS*/
138 char * ocsp_stapling = NULL;
139 char * pri_string = NULL;
143 /*************************************************
144 * SIGALRM handler - crash out *
145 *************************************************/
148 sigalrm_handler_crash(int sig)
150 sig = sig; /* Keep picky compilers happy */
151 printf("\nClient timed out\n");
156 /*************************************************
157 * SIGALRM handler - set flag *
158 *************************************************/
161 sigalrm_handler_flag(int sig)
163 sig = sig; /* Keep picky compilers happy */
169 /****************************************************************************/
170 /****************************************************************************/
173 # ifndef DISABLE_OCSP
175 static STACK_OF(X509) *
176 chain_from_pem_file(const uschar * file)
182 if (!(sk = sk_X509_new_null())) return NULL;
183 if (!(bp = BIO_new_file(CS file, "r"))) return NULL;
184 while ((x = PEM_read_bio_X509(bp, NULL, 0, NULL)))
193 cert_stack_free(STACK_OF(X509) * sk)
195 while (sk_X509_num(sk) > 0) (void) sk_X509_pop(sk);
201 tls_client_stapling_cb(SSL *s, void *arg)
203 const unsigned char *p;
210 len = SSL_get_tlsext_status_ocsp_resp(s, &p);
211 /*BIO_printf(arg, "OCSP response: ");*/
214 BIO_printf(arg, "no response received\n");
217 if(!(rsp = d2i_OCSP_RESPONSE(NULL, &p, len)))
219 BIO_printf(arg, "response parse error\n");
220 BIO_dump_indent(arg, (char *)p, len, 4);
223 if(!(bs = OCSP_response_get1_basic(rsp)))
225 BIO_printf(arg, "error parsing response\n");
230 if (!(sk = chain_from_pem_file((const uschar *)ocsp_stapling)))
232 BIO_printf(arg, "error in cert setup\n");
236 /* OCSP_basic_verify takes a "store" arg, but does not
237 use it for the chain verification, which is all we do
238 when OCSP_NOVERIFY is set. The content from the wire
239 (in "bs") and a cert-stack "sk" are all that is used. */
241 if(OCSP_basic_verify(bs, sk, NULL, OCSP_NOVERIFY) <= 0)
243 BIO_printf(arg, "Response Verify Failure\n");
244 ERR_print_errors(arg);
248 BIO_printf(arg, "Response verify OK\n");
253 # endif /*DISABLE_OCSP*/
256 /*************************************************
257 * Start an OpenSSL TLS session *
258 *************************************************/
261 tls_start(int sock, SSL **ssl, SSL_CTX *ctx)
264 static const unsigned char *sid_ctx = US"exim";
266 RAND_load_file("client.c", -1); /* Not *very* random! */
268 *ssl = SSL_new (ctx);
269 SSL_set_session_id_context(*ssl, sid_ctx, strlen(CS sid_ctx));
270 SSL_set_fd (*ssl, sock);
271 SSL_set_connect_state(*ssl);
276 SSL_CTX_set_tlsext_status_cb(ctx, tls_client_stapling_cb);
277 SSL_CTX_set_tlsext_status_arg(ctx, BIO_new_fp(stdout, BIO_NOCLOSE));
278 SSL_set_tlsext_status_type(*ssl, TLSEXT_STATUSTYPE_ocsp);
282 signal(SIGALRM, sigalrm_handler_flag);
285 rc = SSL_connect (*ssl);
290 printf("SSL_connect timed out\n");
296 ERR_print_errors_fp(stdout);
300 printf("SSL connection using %s\n", SSL_get_cipher (*ssl));
305 /*************************************************
306 * SSL Information callback *
307 *************************************************/
310 info_callback(SSL *s, int where, int ret)
314 printf("SSL info: %s\n", SSL_state_string_long(s));
319 /****************************************************************************/
320 /****************************************************************************/
324 /*************************************************
325 * Handle GnuTLS error *
326 *************************************************/
328 /* Called from lots of places when errors occur before actually starting to do
329 the TLS handshake, that is, while the session is still in clear.
333 err a GnuTLS error number, or 0 if local error
335 Returns: doesn't - it dies
339 gnutls_error(uschar *prefix, int err)
341 fprintf(stderr, "GnuTLS connection error: %s:", prefix);
342 if (err != 0) fprintf(stderr, " %s", gnutls_strerror(err));
343 fprintf(stderr, "\n");
349 /*************************************************
350 * Setup up DH parameters *
351 *************************************************/
353 /* For the test suite, the parameters should always be available in the spool
362 uschar filename[200];
365 /* Initialize the data structures for holding the parameters */
367 ret = gnutls_dh_params_init(&dh_params);
368 if (ret < 0) gnutls_error(US"init dh_params", ret);
370 /* Open the cache file for reading and if successful, read it and set up the
373 fd = open("aux-fixed/gnutls-params", O_RDONLY, 0);
376 fprintf(stderr, "Failed to open spool/gnutls-params: %s\n", strerror(errno));
380 if (fstat(fd, &statbuf) < 0)
383 return gnutls_error(US"TLS cache stat failed", 0);
386 m.size = statbuf.st_size;
387 m.data = malloc(m.size);
389 return gnutls_error(US"memory allocation failed", 0);
390 if (read(fd, m.data, m.size) != m.size)
391 return gnutls_error(US"TLS cache read failed", 0);
394 ret = gnutls_dh_params_import_pkcs3(dh_params, &m, GNUTLS_X509_FMT_PEM);
395 if (ret < 0) return gnutls_error(US"DH params import", ret);
402 /*************************************************
403 * Initialize for GnuTLS *
404 *************************************************/
408 certificate certificate file
409 privatekey private key file
413 tls_init(uschar *certificate, uschar *privatekey)
417 rc = gnutls_global_init();
418 if (rc < 0) gnutls_error(US"gnutls_global_init", rc);
420 /* Read D-H parameters from the cache file. */
424 /* Create the credentials structure */
426 rc = gnutls_certificate_allocate_credentials(&x509_cred);
427 if (rc < 0) gnutls_error(US"certificate_allocate_credentials", rc);
429 /* Set the certificate and private keys */
431 if (certificate != NULL)
433 rc = gnutls_certificate_set_x509_key_file(x509_cred, CS certificate,
434 CS privatekey, GNUTLS_X509_FMT_PEM);
435 if (rc < 0) gnutls_error(US"gnutls_certificate", rc);
438 /* Associate the parameters with the x509 credentials structure. */
440 gnutls_certificate_set_dh_params(x509_cred, dh_params);
442 /* set the CA info for server-cert verify */
444 gnutls_certificate_set_x509_trust_file(x509_cred, ocsp_stapling,
445 GNUTLS_X509_FMT_PEM);
450 /*************************************************
451 * Initialize a single GNUTLS session *
452 *************************************************/
454 static gnutls_session_t
455 tls_session_init(void)
457 gnutls_session_t session;
459 gnutls_init(&session, GNUTLS_CLIENT | GNUTLS_NO_EXTENSIONS);
461 # if GNUTLS_VERSION_NUMBER < 0x030400
462 gnutls_cipher_set_priority(session, default_cipher_priority);
463 gnutls_compression_set_priority(session, comp_priority);
464 gnutls_kx_set_priority(session, kx_priority);
465 gnutls_protocol_set_priority(session, protocol_priority);
466 gnutls_mac_set_priority(session, mac_priority);
468 gnutls_cred_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
472 gnutls_priority_t priority_cache;
475 gnutls_priority_init(&priority_cache, pri_string, &errpos);
476 gnutls_priority_set(session, priority_cache);
479 gnutls_set_default_priority(session);
480 gnutls_credentials_set(session, GNUTLS_CRD_CERTIFICATE, x509_cred);
483 gnutls_dh_set_prime_bits(session, DH_BITS);
484 gnutls_db_set_cache_expiration(session, ssl_session_timeout);
491 /****************************************************************************/
492 /* Turn "\n" and "\r" into the relevant characters. This is a hack. */
495 unescape_buf(unsigned char * buf, int len)
501 for (s = buf; s < buf+len; s++) if (*s == '\\')
505 default: c = s[1]; shift = 1; break;
506 case 'n': c = '\n'; shift = 1; break;
507 case 'r': c = '\r'; shift = 1; break;
510 if (t >= 'A' && t <= 'F') t -= 'A'-'9'-1;
511 else if (t >= 'a' && t <= 'f') t -= 'a'-'9'-1;
515 if (t >= 'A' && t <= 'F') t -= 'A'-'9'-1;
516 else if (t >= 'a' && t <= 'f') t -= 'a'-'9'-1;
523 memmove(s+1, s+shift+1, len-shift);
530 /****************************************************************************/
542 do_file(srv_ctx * srv, FILE * f, int timeout,
543 unsigned char * inbuffer, unsigned bsiz, unsigned char * inptr)
545 unsigned char outbuffer[1024 * 20];
547 while (fgets(CS outbuffer, sizeof(outbuffer), f) != NULL)
549 int n = (int)strlen(CS outbuffer);
553 /* Strip trailing newline */
554 if (outbuffer[n-1] == '\n') outbuffer[--n] = 0;
556 /* Expect incoming */
558 if ( strncmp(CS outbuffer, "???", 3) == 0
559 && (outbuffer[3] == ' ' || outbuffer[3] == '*' || outbuffer[3] == '?')
562 unsigned char *lineptr;
563 unsigned exp_eof = outbuffer[3] == '*';
564 unsigned resp_optional = outbuffer[3] == '?';
566 printf("%s\n", outbuffer);
567 n = unescape_buf(outbuffer, n);
570 if (*inptr == 0) /* Refill input buffer */
577 DEBUG { printf("call SSL_read\n"); fflush(stdout); }
578 rc = SSL_read(srv->ssl, inbuffer, bsiz - 1);
579 DEBUG { printf("SSL_read: %d\n", rc); fflush(stdout); }
581 switch (error = SSL_get_error(srv->ssl, rc))
583 case SSL_ERROR_ZERO_RETURN:
585 case SSL_ERROR_SYSCALL:
586 printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
590 printf("%s\nTLS terminated\n", ERR_error_string(ERR_get_error(), NULL));
591 SSL_shutdown(srv->ssl);
593 srv->tls_active = FALSE;
594 { /* OpenSSL leaves it in restartsys mode */
595 struct sigaction act = {.sa_handler = sigalrm_handler_flag, .sa_flags = 0};
597 sigaction(SIGALRM, &act, NULL);
600 DEBUG { printf("go round\n"); fflush(stdout); }
603 printf("SSL error code %d\n", error);
607 rc = gnutls_record_recv(tls_session, CS inbuffer, bsiz - 1);
612 DEBUG { printf("call read\n"); fflush(stdout); }
613 rc = read(srv->sock, inbuffer, bsiz);
614 DEBUG { printf("read: %d\n", rc); fflush(stdout); }
620 if (errno == EINTR && sigalrm_seen && resp_optional)
621 continue; /* next scriptline */
622 printf("Read error %s\n", strerror(errno));
628 printf("Expected EOF read\n");
631 else if (resp_optional)
632 continue; /* next scriptline */
635 printf("Unexpected EOF read\n");
641 printf("Expected EOF not read\n");
651 DEBUG { printf("read: '%s'\n", inptr); fflush(stdout); }
654 while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++;
658 if (*inptr == '\n') inptr++;
661 if (strncmp(CS lineptr, CS outbuffer + 4, n - 4) != 0)
664 inptr = lineptr; /* consume scriptline, not inputline */
669 printf("<<< %s\n", lineptr);
670 printf("\n******** Input mismatch ********\n");
674 /* Input matched script. Output the inputline, unless optional */
675 DEBUG { printf("read matched\n"); fflush(stdout); }
678 printf("<<< %s\n", lineptr);
681 /* If there is further input after this line, consume inputline but not
682 scriptline in case there are several matching. Nonmatches are dealt with
689 if (srv->sent_starttls)
691 if (lineptr[0] == '2')
695 printf("Attempting to start TLS\n");
699 srv->tls_active = tls_start(srv->sock, &srv->ssl, srv->ctx);
705 sigalrm_seen = FALSE;
708 rc = gnutls_handshake(tls_session);
709 } while (rc < 0 && gnutls_error_is_fatal(rc) == 0);
710 srv->tls_active = rc >= 0;
713 if (!srv->tls_active) printf("%s\n", gnutls_strerror(rc));
717 if (!srv->tls_active)
719 printf("Failed to start TLS\n");
723 else if (ocsp_stapling)
725 if ((rc= gnutls_certificate_verify_peers2(tls_session, &verify)) < 0)
727 printf("Failed to verify certificate: %s\n", gnutls_strerror(rc));
730 else if (verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED))
732 printf("Bad certificate\n");
736 else if (gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0)
738 printf("Failed to verify certificate status\n");
740 gnutls_datum_t stapling;
741 gnutls_ocsp_resp_t resp;
742 gnutls_datum_t printed;
743 if ( (rc= gnutls_ocsp_status_request_get(tls_session, &stapling)) == 0
744 && (rc= gnutls_ocsp_resp_init(&resp)) == 0
745 && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0
746 && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &printed)) == 0
749 fprintf(stderr, "%.4096s", printed.data);
750 gnutls_free(printed.data);
753 (void) fprintf(stderr,"ocsp decode: %s", gnutls_strerror(rc));
761 printf("Succeeded in starting TLS\n");
763 else printf("Abandoning TLS start attempt\n");
765 srv->sent_starttls = 0;
769 /* Wait for a bit before proceeding */
771 else if (strncmp(CS outbuffer, "+++ ", 4) == 0)
773 printf("%s\n", outbuffer);
774 sleep(atoi(CS outbuffer + 4));
777 /* Stack new input file */
779 else if (strncmp(CS outbuffer, "<<< ", 4) == 0)
782 if (!(new_f = fopen((const char *)outbuffer+4 , "r")))
784 printf("Unable to open '%s': %s", inptr, strerror(errno));
787 do_file(srv, new_f, timeout, inbuffer, bsiz, inptr);
791 /* Send line outgoing, but barf if unconsumed incoming */
795 unsigned char * out = outbuffer;
797 if (strncmp(CS outbuffer, ">>> ", 4) == 0)
806 printf("Unconsumed input: %s", inptr);
807 printf(" About to send: %s\n", out);
815 if (strcmp(CS out, "stoptls") == 0 ||
816 strcmp(CS out, "STOPTLS") == 0)
818 if (!srv->tls_active)
820 printf("STOPTLS read when TLS not active\n");
823 printf("Shutting down TLS encryption\n");
826 SSL_shutdown(srv->ssl);
831 gnutls_bye(tls_session, GNUTLS_SHUT_WR);
832 gnutls_deinit(tls_session);
834 gnutls_global_deinit();
841 /* Remember that we sent STARTTLS */
843 srv->sent_starttls = (strcmp(CS out, "starttls") == 0 ||
844 strcmp(CS out, "STARTTLS") == 0);
846 /* Fudge: if the command is "starttls_wait", we send the starttls bit,
847 but we haven't set the flag, so that there is no negotiation. This is for
848 testing the server's timeout. */
850 if (strcmp(CS out, "starttls_wait") == 0)
857 printf(">>> %s\n", out);
860 strcpy(CS out + n, "\r\n");
864 n = unescape_buf(out, n);
872 rc = SSL_write (srv->ssl, out, n);
875 if ((rc = gnutls_record_send(tls_session, CS out, n)) < 0)
877 printf("GnuTLS write error: %s\n", gnutls_strerror(rc));
883 rc = write(srv->sock, out, n);
888 printf("Write error: %s\n", strerror(errno));
898 /*************************************************
900 *************************************************/
902 const char * const HELP_MESSAGE = "\n\
910 [-p priority-string]\n"
914 [-tn] n seconds timeout\n\
917 [<outgoing interface>]\n\
923 main(int argc, char **argv)
925 struct sockaddr *s_ptr;
926 struct sockaddr_in s_in4;
927 char *interface = NULL;
928 char *address = NULL;
929 char *certfile = NULL;
930 char *keyfile = NULL;
933 int host_af, port, s_len, rc, save_errno;
935 int tls_on_connect = 0;
939 struct sockaddr_in6 s_in6;
944 unsigned char inbuffer[10240];
945 unsigned char *inptr = inbuffer;
947 *inptr = 0; /* Buffer empty */
949 srv.sent_starttls = 0;
953 while (argc >= argi + 1 && argv[argi][0] == '-')
955 if (strcmp(argv[argi], "-help") == 0 ||
956 strcmp(argv[argi], "--help") == 0 ||
957 strcmp(argv[argi], "-h") == 0)
962 if (strcmp(argv[argi], "-tls-on-connect") == 0)
968 else if (strcmp(argv[argi], "-ocsp") == 0)
970 if (argc < ++argi + 1)
972 fprintf(stderr, "Missing required certificate file for ocsp option\n");
975 ocsp_stapling = argv[argi++];
978 else if (strcmp(argv[argi], "-p") == 0)
980 if (argc < ++argi + 1)
982 fprintf(stderr, "Missing priority string\n");
985 pri_string = argv[argi++];
990 else if (argv[argi][1] == 't' && isdigit(argv[argi][2]))
992 tmplong = strtol(argv[argi]+2, &end, 10);
993 if (end == argv[argi]+2 || *end)
995 fprintf(stderr, "Failed to parse seconds from option <%s>\n",
999 if (tmplong > 10000L)
1001 fprintf(stderr, "Unreasonably long wait of %ld seconds requested\n",
1007 fprintf(stderr, "Timeout must not be negative (%ld)\n", tmplong);
1010 timeout = (int) tmplong;
1015 fprintf(stderr, "Unrecognized option %s\n", argv[argi]);
1020 /* Mandatory 1st arg is IP address */
1024 fprintf(stderr, "No IP address given\n");
1028 address = argv[argi++];
1029 host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET;
1031 /* Mandatory 2nd arg is port */
1035 fprintf(stderr, "No port number given\n");
1039 port = atoi(argv[argi++]);
1041 /* Optional next arg is interface */
1044 (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':'))
1045 interface = argv[argi++];
1047 /* Any more arguments are the name of a certificate file and key file */
1049 if (argc > argi) certfile = argv[argi++];
1050 if (argc > argi) keyfile = argv[argi++];
1054 /* For an IPv6 address, use an IPv6 sockaddr structure. */
1056 if (host_af == AF_INET6)
1058 s_ptr = (struct sockaddr *)&s_in6;
1059 s_len = sizeof(s_in6);
1064 /* For an IPv4 address, use an IPv4 sockaddr structure,
1065 even on an IPv6 system. */
1068 s_ptr = (struct sockaddr *)&s_in4;
1069 s_len = sizeof(s_in4);
1072 printf("Connecting to %s port %d ... ", address, port);
1074 srv.sock = socket(host_af, SOCK_STREAM, 0);
1077 printf("socket creation failed: %s\n", strerror(errno));
1081 /* Bind to a specific interface if requested. On an IPv6 system, this has
1082 to be of the same family as the address we are calling. On an IPv4 system the
1083 test is redundant, but it keeps the code tidier. */
1085 if (interface != NULL)
1087 int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET;
1089 if (interface_af == host_af)
1093 /* Set up for IPv6 binding */
1095 if (host_af == AF_INET6)
1097 memset(&s_in6, 0, sizeof(s_in6));
1098 s_in6.sin6_family = AF_INET6;
1099 s_in6.sin6_port = 0;
1100 if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1)
1102 printf("Unable to parse \"%s\"", interface);
1109 /* Set up for IPv4 binding */
1112 memset(&s_in4, 0, sizeof(s_in4));
1113 s_in4.sin_family = AF_INET;
1115 s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface);
1120 if (bind(srv.sock, s_ptr, s_len) < 0)
1122 printf("Unable to bind outgoing SMTP call to %s: %s",
1123 interface, strerror(errno));
1129 /* Set up a remote IPv6 address */
1132 if (host_af == AF_INET6)
1134 memset(&s_in6, 0, sizeof(s_in6));
1135 s_in6.sin6_family = AF_INET6;
1136 s_in6.sin6_port = htons(port);
1137 if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1)
1139 printf("Unable to parse \"%s\"", address);
1146 /* Set up a remote IPv4 address */
1149 memset(&s_in4, 0, sizeof(s_in4));
1150 s_in4.sin_family = AF_INET;
1151 s_in4.sin_port = htons(port);
1152 s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address);
1155 /* SIGALRM handler crashes out */
1157 signal(SIGALRM, sigalrm_handler_crash);
1159 rc = connect(srv.sock, s_ptr, s_len);
1163 /* A failure whose error code is "Interrupted system call" is in fact
1164 an externally applied timeout if the signal handler has been run. */
1169 printf("connect failed: %s\n", strerror(save_errno));
1173 printf("connected\n");
1176 /* --------------- Set up for OpenSSL --------------- */
1180 SSL_load_error_strings();
1182 if (!(srv.ctx = SSL_CTX_new(SSLv23_method())))
1184 printf ("SSL_CTX_new failed\n");
1190 if (!SSL_CTX_use_certificate_file(srv.ctx, certfile, SSL_FILETYPE_PEM))
1192 printf("SSL_CTX_use_certificate_file failed\n");
1195 printf("Certificate file = %s\n", certfile);
1200 if (!SSL_CTX_use_PrivateKey_file(srv.ctx, keyfile, SSL_FILETYPE_PEM))
1202 printf("SSL_CTX_use_PrivateKey_file failed\n");
1205 printf("Key file = %s\n", keyfile);
1208 SSL_CTX_set_session_cache_mode(srv.ctx, SSL_SESS_CACHE_BOTH);
1209 SSL_CTX_set_timeout(srv.ctx, 200);
1210 SSL_CTX_set_info_callback(srv.ctx, (void (*)())info_callback);
1214 /* --------------- Set up for GnuTLS --------------- */
1217 if (certfile != NULL) printf("Certificate file = %s\n", certfile);
1218 if (keyfile != NULL) printf("Key file = %s\n", keyfile);
1219 tls_init(US certfile, US keyfile);
1220 tls_session = tls_session_init();
1223 gnutls_ocsp_status_request_enable_client(tls_session, NULL, 0, NULL);
1225 gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr_t)(intptr_t)srv.sock);
1227 /* When the server asks for a certificate and the client does not have one,
1228 there is a SIGPIPE error in the gnutls_handshake() function for some reason
1229 that is not understood. As luck would have it, this has never hit Exim itself
1230 because it ignores SIGPIPE errors. Doing the same here allows it all to work as
1233 signal(SIGPIPE, SIG_IGN);
1236 /* ---------------------------------------------- */
1239 /* Start TLS session if configured to do so without STARTTLS */
1244 printf("Attempting to start TLS\n");
1247 srv.tls_active = tls_start(srv.sock, &srv.ssl, srv.ctx);
1253 sigalrm_seen = FALSE;
1256 rc = gnutls_handshake(tls_session);
1257 } while (rc < 0 && gnutls_error_is_fatal(rc) == 0);
1258 srv.tls_active = rc >= 0;
1261 if (!srv.tls_active) printf("%s\n", gnutls_strerror(rc));
1265 if (!srv.tls_active)
1266 printf("Failed to start TLS\n");
1267 #if defined(HAVE_GNUTLS) && defined(HAVE_OCSP)
1268 else if ( ocsp_stapling
1269 && gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0)
1270 printf("Failed to verify certificate status\n");
1273 printf("Succeeded in starting TLS\n");
1277 do_file(&srv, stdin, timeout, inbuffer, sizeof(inbuffer), inptr);
1279 printf("End of script\n");
1280 shutdown(srv.sock, SHUT_WR);
1281 if (fcntl(srv.sock, F_SETFL, O_NONBLOCK) == 0)
1282 while (read(srv.sock, inbuffer, sizeof(inbuffer)) > 0) ;
1288 /* End of client.c */