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 */
573 unsigned char *inbufferp = inbuffer;
579 DEBUG { printf("call SSL_read\n"); fflush(stdout); }
580 rc = SSL_read(srv->ssl, inbufferp, bsiz - (inbufferp - inbuffer) - 1);
581 DEBUG { printf("SSL_read: %d\n", rc); fflush(stdout); }
583 switch (error = SSL_get_error(srv->ssl, rc))
585 case SSL_ERROR_ZERO_RETURN:
587 case SSL_ERROR_SYSCALL:
588 printf("%s\n", ERR_error_string(ERR_get_error(), NULL));
592 printf("%s\nTLS terminated\n", ERR_error_string(ERR_get_error(), NULL));
593 SSL_shutdown(srv->ssl);
595 srv->tls_active = FALSE;
596 { /* OpenSSL leaves it in restartsys mode */
597 struct sigaction act = {.sa_handler = sigalrm_handler_flag, .sa_flags = 0};
599 sigaction(SIGALRM, &act, NULL);
602 DEBUG { printf("go round\n"); fflush(stdout); }
605 printf("SSL error code %d\n", error);
609 rc = gnutls_record_recv(tls_session, CS inbufferp, bsiz - (inbufferp - inbuffer) - 1);
614 DEBUG { printf("call read\n"); fflush(stdout); }
615 rc = read(srv->sock, inbufferp, bsiz - (inbufferp - inbuffer) - 1);
616 DEBUG { printf("read: %d\n", rc); fflush(stdout); }
619 if (rc > 0) inbufferp[rc] = '\0';
620 if (rc <= 0 || strchr(inbufferp, '\n')) break;
622 if (inbufferp >= inbuffer + bsiz) {
623 printf("Input buffer overrun, need more than %d bytes input buffer\n", bsiz);
626 DEBUG { printf("read more\n"); }
632 if (errno == EINTR && sigalrm_seen && resp_optional)
633 continue; /* next scriptline */
634 printf("Read error %s\n", strerror(errno));
640 printf("Expected EOF read\n");
643 else if (resp_optional)
644 continue; /* next scriptline */
647 printf("Unexpected EOF read\n");
653 printf("Expected EOF not read\n");
660 DEBUG { printf("read: '%s'\n", inptr); fflush(stdout); }
663 while (*inptr != 0 && *inptr != '\r' && *inptr != '\n') inptr++;
667 if (*inptr == '\n') inptr++;
670 if (strncmp(CS lineptr, CS outbuffer + 4, n - 4) != 0)
673 inptr = lineptr; /* consume scriptline, not inputline */
678 printf("<<< %s\n", lineptr);
679 printf("\n******** Input mismatch ********\n");
683 /* Input matched script. Output the inputline, unless optional */
684 DEBUG { printf("read matched\n"); fflush(stdout); }
687 printf("<<< %s\n", lineptr);
690 /* If there is further input after this line, consume inputline but not
691 scriptline in case there are several matching. Nonmatches are dealt with
698 if (srv->sent_starttls)
700 if (lineptr[0] == '2')
704 printf("Attempting to start TLS\n");
708 srv->tls_active = tls_start(srv->sock, &srv->ssl, srv->ctx);
714 sigalrm_seen = FALSE;
717 rc = gnutls_handshake(tls_session);
718 } while (rc < 0 && gnutls_error_is_fatal(rc) == 0);
719 srv->tls_active = rc >= 0;
722 if (!srv->tls_active) printf("%s\n", gnutls_strerror(rc));
726 if (!srv->tls_active)
728 printf("Failed to start TLS\n");
732 else if (ocsp_stapling)
734 if ((rc= gnutls_certificate_verify_peers2(tls_session, &verify)) < 0)
736 printf("Failed to verify certificate: %s\n", gnutls_strerror(rc));
739 else if (verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED))
741 printf("Bad certificate\n");
745 else if (gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0)
747 printf("Failed to verify certificate status\n");
749 gnutls_datum_t stapling;
750 gnutls_ocsp_resp_t resp;
751 gnutls_datum_t printed;
752 if ( (rc= gnutls_ocsp_status_request_get(tls_session, &stapling)) == 0
753 && (rc= gnutls_ocsp_resp_init(&resp)) == 0
754 && (rc= gnutls_ocsp_resp_import(resp, &stapling)) == 0
755 && (rc= gnutls_ocsp_resp_print(resp, GNUTLS_OCSP_PRINT_FULL, &printed)) == 0
758 fprintf(stderr, "%.4096s", printed.data);
759 gnutls_free(printed.data);
762 (void) fprintf(stderr,"ocsp decode: %s", gnutls_strerror(rc));
770 printf("Succeeded in starting TLS\n");
772 else printf("Abandoning TLS start attempt\n");
774 srv->sent_starttls = 0;
778 /* Wait for a bit before proceeding */
780 else if (strncmp(CS outbuffer, "+++ ", 4) == 0)
782 printf("%s\n", outbuffer);
783 sleep(atoi(CS outbuffer + 4));
786 /* Stack new input file */
788 else if (strncmp(CS outbuffer, "<<< ", 4) == 0)
791 if (!(new_f = fopen((const char *)outbuffer+4 , "r")))
793 printf("Unable to open '%s': %s", inptr, strerror(errno));
796 do_file(srv, new_f, timeout, inbuffer, bsiz, inptr);
800 /* Send line outgoing, but barf if unconsumed incoming */
804 unsigned char * out = outbuffer;
806 if (strncmp(CS outbuffer, ">>> ", 4) == 0)
815 printf("Unconsumed input: %s", inptr);
816 printf(" About to send: %s\n", out);
824 if (strcmp(CS out, "stoptls") == 0 ||
825 strcmp(CS out, "STOPTLS") == 0)
827 if (!srv->tls_active)
829 printf("STOPTLS read when TLS not active\n");
832 printf("Shutting down TLS encryption\n");
835 SSL_shutdown(srv->ssl);
840 gnutls_bye(tls_session, GNUTLS_SHUT_WR);
841 gnutls_deinit(tls_session);
843 gnutls_global_deinit();
850 /* Remember that we sent STARTTLS */
852 srv->sent_starttls = (strcmp(CS out, "starttls") == 0 ||
853 strcmp(CS out, "STARTTLS") == 0);
855 /* Fudge: if the command is "starttls_wait", we send the starttls bit,
856 but we haven't set the flag, so that there is no negotiation. This is for
857 testing the server's timeout. */
859 if (strcmp(CS out, "starttls_wait") == 0)
866 printf(">>> %s\n", out);
869 strcpy(CS out + n, "\r\n");
873 n = unescape_buf(out, n);
881 rc = SSL_write (srv->ssl, out, n);
884 if ((rc = gnutls_record_send(tls_session, CS out, n)) < 0)
886 printf("GnuTLS write error: %s\n", gnutls_strerror(rc));
892 rc = write(srv->sock, out, n);
897 printf("Write error: %s\n", strerror(errno));
907 /*************************************************
909 *************************************************/
911 const char * const HELP_MESSAGE = "\n\
919 [-p priority-string]\n"
923 [-tn] n seconds timeout\n\
926 [<outgoing interface>]\n\
932 main(int argc, char **argv)
934 struct sockaddr *s_ptr;
935 struct sockaddr_in s_in4;
936 char *interface = NULL;
937 char *address = NULL;
938 char *certfile = NULL;
939 char *keyfile = NULL;
942 int host_af, port, s_len, rc, save_errno;
944 int tls_on_connect = 0;
948 struct sockaddr_in6 s_in6;
953 unsigned char inbuffer[100 * 1024];
954 unsigned char *inptr = inbuffer;
956 *inptr = 0; /* Buffer empty */
958 srv.sent_starttls = 0;
962 while (argc >= argi + 1 && argv[argi][0] == '-')
964 if (strcmp(argv[argi], "-help") == 0 ||
965 strcmp(argv[argi], "--help") == 0 ||
966 strcmp(argv[argi], "-h") == 0)
971 if (strcmp(argv[argi], "-tls-on-connect") == 0)
977 else if (strcmp(argv[argi], "-ocsp") == 0)
979 if (argc < ++argi + 1)
981 fprintf(stderr, "Missing required certificate file for ocsp option\n");
984 ocsp_stapling = argv[argi++];
987 else if (strcmp(argv[argi], "-p") == 0)
989 if (argc < ++argi + 1)
991 fprintf(stderr, "Missing priority string\n");
994 pri_string = argv[argi++];
999 else if (argv[argi][1] == 't' && isdigit(argv[argi][2]))
1001 tmplong = strtol(argv[argi]+2, &end, 10);
1002 if (end == argv[argi]+2 || *end)
1004 fprintf(stderr, "Failed to parse seconds from option <%s>\n",
1008 if (tmplong > 10000L)
1010 fprintf(stderr, "Unreasonably long wait of %ld seconds requested\n",
1016 fprintf(stderr, "Timeout must not be negative (%ld)\n", tmplong);
1019 timeout = (int) tmplong;
1024 fprintf(stderr, "Unrecognized option %s\n", argv[argi]);
1029 /* Mandatory 1st arg is IP address */
1033 fprintf(stderr, "No IP address given\n");
1037 address = argv[argi++];
1038 host_af = (strchr(address, ':') != NULL)? AF_INET6 : AF_INET;
1040 /* Mandatory 2nd arg is port */
1044 fprintf(stderr, "No port number given\n");
1048 port = atoi(argv[argi++]);
1050 /* Optional next arg is interface */
1053 (isdigit((unsigned char)argv[argi][0]) || argv[argi][0] == ':'))
1054 interface = argv[argi++];
1056 /* Any more arguments are the name of a certificate file and key file */
1058 if (argc > argi) certfile = argv[argi++];
1059 if (argc > argi) keyfile = argv[argi++];
1063 /* For an IPv6 address, use an IPv6 sockaddr structure. */
1065 if (host_af == AF_INET6)
1067 s_ptr = (struct sockaddr *)&s_in6;
1068 s_len = sizeof(s_in6);
1073 /* For an IPv4 address, use an IPv4 sockaddr structure,
1074 even on an IPv6 system. */
1077 s_ptr = (struct sockaddr *)&s_in4;
1078 s_len = sizeof(s_in4);
1081 printf("Connecting to %s port %d ... ", address, port);
1083 srv.sock = socket(host_af, SOCK_STREAM, 0);
1086 printf("socket creation failed: %s\n", strerror(errno));
1090 /* Bind to a specific interface if requested. On an IPv6 system, this has
1091 to be of the same family as the address we are calling. On an IPv4 system the
1092 test is redundant, but it keeps the code tidier. */
1094 if (interface != NULL)
1096 int interface_af = (strchr(interface, ':') != NULL)? AF_INET6 : AF_INET;
1098 if (interface_af == host_af)
1102 /* Set up for IPv6 binding */
1104 if (host_af == AF_INET6)
1106 memset(&s_in6, 0, sizeof(s_in6));
1107 s_in6.sin6_family = AF_INET6;
1108 s_in6.sin6_port = 0;
1109 if (inet_pton(AF_INET6, interface, &s_in6.sin6_addr) != 1)
1111 printf("Unable to parse \"%s\"", interface);
1118 /* Set up for IPv4 binding */
1121 memset(&s_in4, 0, sizeof(s_in4));
1122 s_in4.sin_family = AF_INET;
1124 s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(interface);
1129 if (bind(srv.sock, s_ptr, s_len) < 0)
1131 printf("Unable to bind outgoing SMTP call to %s: %s",
1132 interface, strerror(errno));
1138 /* Set up a remote IPv6 address */
1141 if (host_af == AF_INET6)
1143 memset(&s_in6, 0, sizeof(s_in6));
1144 s_in6.sin6_family = AF_INET6;
1145 s_in6.sin6_port = htons(port);
1146 if (inet_pton(host_af, address, &s_in6.sin6_addr) != 1)
1148 printf("Unable to parse \"%s\"", address);
1155 /* Set up a remote IPv4 address */
1158 memset(&s_in4, 0, sizeof(s_in4));
1159 s_in4.sin_family = AF_INET;
1160 s_in4.sin_port = htons(port);
1161 s_in4.sin_addr.s_addr = (S_ADDR_TYPE)inet_addr(address);
1164 /* SIGALRM handler crashes out */
1166 signal(SIGALRM, sigalrm_handler_crash);
1168 rc = connect(srv.sock, s_ptr, s_len);
1172 /* A failure whose error code is "Interrupted system call" is in fact
1173 an externally applied timeout if the signal handler has been run. */
1178 printf("connect failed: %s\n", strerror(save_errno));
1182 printf("connected\n");
1185 /* --------------- Set up for OpenSSL --------------- */
1189 SSL_load_error_strings();
1191 if (!(srv.ctx = SSL_CTX_new(SSLv23_method())))
1193 printf ("SSL_CTX_new failed\n");
1199 if (!SSL_CTX_use_certificate_file(srv.ctx, certfile, SSL_FILETYPE_PEM))
1201 printf("SSL_CTX_use_certificate_file failed\n");
1204 printf("Certificate file = %s\n", certfile);
1209 if (!SSL_CTX_use_PrivateKey_file(srv.ctx, keyfile, SSL_FILETYPE_PEM))
1211 printf("SSL_CTX_use_PrivateKey_file failed\n");
1214 printf("Key file = %s\n", keyfile);
1217 SSL_CTX_set_session_cache_mode(srv.ctx, SSL_SESS_CACHE_BOTH);
1218 SSL_CTX_set_timeout(srv.ctx, 200);
1219 SSL_CTX_set_info_callback(srv.ctx, (void (*)())info_callback);
1223 /* --------------- Set up for GnuTLS --------------- */
1226 if (certfile != NULL) printf("Certificate file = %s\n", certfile);
1227 if (keyfile != NULL) printf("Key file = %s\n", keyfile);
1228 tls_init(US certfile, US keyfile);
1229 tls_session = tls_session_init();
1232 gnutls_ocsp_status_request_enable_client(tls_session, NULL, 0, NULL);
1234 gnutls_transport_set_ptr(tls_session, (gnutls_transport_ptr_t)(intptr_t)srv.sock);
1236 /* When the server asks for a certificate and the client does not have one,
1237 there is a SIGPIPE error in the gnutls_handshake() function for some reason
1238 that is not understood. As luck would have it, this has never hit Exim itself
1239 because it ignores SIGPIPE errors. Doing the same here allows it all to work as
1242 signal(SIGPIPE, SIG_IGN);
1245 /* ---------------------------------------------- */
1248 /* Start TLS session if configured to do so without STARTTLS */
1253 printf("Attempting to start TLS\n");
1256 srv.tls_active = tls_start(srv.sock, &srv.ssl, srv.ctx);
1262 sigalrm_seen = FALSE;
1265 rc = gnutls_handshake(tls_session);
1266 } while (rc < 0 && gnutls_error_is_fatal(rc) == 0);
1267 srv.tls_active = rc >= 0;
1270 if (!srv.tls_active) printf("%s\n", gnutls_strerror(rc));
1274 if (!srv.tls_active)
1275 printf("Failed to start TLS\n");
1276 #if defined(HAVE_GNUTLS) && defined(HAVE_OCSP)
1277 else if ( ocsp_stapling
1278 && gnutls_ocsp_status_request_is_checked(tls_session, 0) == 0)
1279 printf("Failed to verify certificate status\n");
1282 printf("Succeeded in starting TLS\n");
1286 do_file(&srv, stdin, timeout, inbuffer, sizeof(inbuffer), inptr);
1288 printf("End of script\n");
1289 shutdown(srv.sock, SHUT_WR);
1290 if (fcntl(srv.sock, F_SETFL, O_NONBLOCK) == 0)
1291 while (read(srv.sock, inbuffer, sizeof(inbuffer)) > 0) ;
1297 /* End of client.c */