1 /*
2 * SSL client for SMTP servers
3 *
4 * Copyright The Mbed TLS Contributors
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 */
19
20 /* Enable definition of gethostname() even when compiling with -std=c99. Must
21 * be set before mbedtls_config.h, which pulls in glibc's features.h indirectly.
22 * Harmless on other platforms. */
23
24 #define _POSIX_C_SOURCE 200112L
25 #define _XOPEN_SOURCE 600
26
27 #include "mbedtls/build_info.h"
28
29 #if defined(MBEDTLS_PLATFORM_C)
30 #include "mbedtls/platform.h"
31 #else
32 #include <stdio.h>
33 #include <stdlib.h>
34 #define mbedtls_time time
35 #define mbedtls_time_t time_t
36 #define mbedtls_fprintf fprintf
37 #define mbedtls_printf printf
38 #define mbedtls_exit exit
39 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
40 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
41 #endif /* MBEDTLS_PLATFORM_C */
42
43 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
44 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
45 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
46 !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
47 !defined(MBEDTLS_FS_IO)
main(void)48 int main( void )
49 {
50 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
51 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
52 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
53 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
54 "not defined.\n");
55 mbedtls_exit( 0 );
56 }
57 #else
58
59 #include "mbedtls/base64.h"
60 #include "mbedtls/error.h"
61 #include "mbedtls/net_sockets.h"
62 #include "mbedtls/ssl.h"
63 #include "mbedtls/entropy.h"
64 #include "mbedtls/ctr_drbg.h"
65 #include "test/certs.h"
66 #include "mbedtls/x509.h"
67
68 #include <stdlib.h>
69 #include <string.h>
70
71 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
72 #include <unistd.h>
73 #else
74 #include <io.h>
75 #endif
76
77 #if defined(_WIN32) || defined(_WIN32_WCE)
78 #include <winsock2.h>
79 #include <windows.h>
80
81 #if defined(_MSC_VER)
82 #if defined(_WIN32_WCE)
83 #pragma comment( lib, "ws2.lib" )
84 #else
85 #pragma comment( lib, "ws2_32.lib" )
86 #endif
87 #endif /* _MSC_VER */
88 #endif
89
90 #define DFL_SERVER_NAME "localhost"
91 #define DFL_SERVER_PORT "465"
92 #define DFL_USER_NAME "user"
93 #define DFL_USER_PWD "password"
94 #define DFL_MAIL_FROM ""
95 #define DFL_MAIL_TO ""
96 #define DFL_DEBUG_LEVEL 0
97 #define DFL_CA_FILE ""
98 #define DFL_CRT_FILE ""
99 #define DFL_KEY_FILE ""
100 #define DFL_FORCE_CIPHER 0
101 #define DFL_MODE 0
102 #define DFL_AUTHENTICATION 0
103
104 #define MODE_SSL_TLS 0
105 #define MODE_STARTTLS 0
106
107 #if defined(MBEDTLS_BASE64_C)
108 #define USAGE_AUTH \
109 " authentication=%%d default: 0 (disabled)\n" \
110 " user_name=%%s default: \"" DFL_USER_NAME "\"\n" \
111 " user_pwd=%%s default: \"" DFL_USER_PWD "\"\n"
112 #else
113 #define USAGE_AUTH \
114 " authentication options disabled. (Require MBEDTLS_BASE64_C)\n"
115 #endif /* MBEDTLS_BASE64_C */
116
117 #if defined(MBEDTLS_FS_IO)
118 #define USAGE_IO \
119 " ca_file=%%s default: \"\" (pre-loaded)\n" \
120 " crt_file=%%s default: \"\" (pre-loaded)\n" \
121 " key_file=%%s default: \"\" (pre-loaded)\n"
122 #else
123 #define USAGE_IO \
124 " No file operations available (MBEDTLS_FS_IO not defined)\n"
125 #endif /* MBEDTLS_FS_IO */
126
127 #define USAGE \
128 "\n usage: ssl_mail_client param=<>...\n" \
129 "\n acceptable parameters:\n" \
130 " server_name=%%s default: " DFL_SERVER_NAME "\n" \
131 " server_port=%%d default: " DFL_SERVER_PORT "\n" \
132 " debug_level=%%d default: 0 (disabled)\n" \
133 " mode=%%d default: 0 (SSL/TLS) (1 for STARTTLS)\n" \
134 USAGE_AUTH \
135 " mail_from=%%s default: \"\"\n" \
136 " mail_to=%%s default: \"\"\n" \
137 USAGE_IO \
138 " force_ciphersuite=<name> default: all enabled\n" \
139 " acceptable ciphersuite names:\n"
140
141
142 /*
143 * global options
144 */
145 struct options
146 {
147 const char *server_name; /* hostname of the server (client only) */
148 const char *server_port; /* port on which the ssl service runs */
149 int debug_level; /* level of debugging */
150 int authentication; /* if authentication is required */
151 int mode; /* SSL/TLS (0) or STARTTLS (1) */
152 const char *user_name; /* username to use for authentication */
153 const char *user_pwd; /* password to use for authentication */
154 const char *mail_from; /* E-Mail address to use as sender */
155 const char *mail_to; /* E-Mail address to use as recipient */
156 const char *ca_file; /* the file with the CA certificate(s) */
157 const char *crt_file; /* the file with the client certificate */
158 const char *key_file; /* the file with the client key */
159 int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
160 } opt;
161
my_debug(void * ctx,int level,const char * file,int line,const char * str)162 static void my_debug( void *ctx, int level,
163 const char *file, int line,
164 const char *str )
165 {
166 ((void) level);
167
168 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
169 fflush( (FILE *) ctx );
170 }
171
do_handshake(mbedtls_ssl_context * ssl)172 static int do_handshake( mbedtls_ssl_context *ssl )
173 {
174 int ret;
175 uint32_t flags;
176 unsigned char buf[1024];
177 memset(buf, 0, 1024);
178
179 /*
180 * 4. Handshake
181 */
182 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
183 fflush( stdout );
184
185 while( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
186 {
187 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
188 {
189 #if defined(MBEDTLS_ERROR_C)
190 mbedtls_strerror( ret, (char *) buf, 1024 );
191 #endif
192 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d: %s\n\n", ret, buf );
193 return( -1 );
194 }
195 }
196
197 mbedtls_printf( " ok\n [ Ciphersuite is %s ]\n",
198 mbedtls_ssl_get_ciphersuite( ssl ) );
199
200 /*
201 * 5. Verify the server certificate
202 */
203 mbedtls_printf( " . Verifying peer X.509 certificate..." );
204
205 /* In real life, we probably want to bail out when ret != 0 */
206 if( ( flags = mbedtls_ssl_get_verify_result( ssl ) ) != 0 )
207 {
208 #if !defined(MBEDTLS_X509_REMOVE_INFO)
209 char vrfy_buf[512];
210 #endif
211
212 mbedtls_printf( " failed\n" );
213
214 #if !defined(MBEDTLS_X509_REMOVE_INFO)
215 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
216
217 mbedtls_printf( "%s\n", vrfy_buf );
218 #endif
219 }
220 else
221 mbedtls_printf( " ok\n" );
222
223 #if !defined(MBEDTLS_X509_REMOVE_INFO)
224 mbedtls_printf( " . Peer certificate information ...\n" );
225 mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
226 mbedtls_ssl_get_peer_cert( ssl ) );
227 mbedtls_printf( "%s\n", buf );
228 #endif
229
230 return( 0 );
231 }
232
write_ssl_data(mbedtls_ssl_context * ssl,unsigned char * buf,size_t len)233 static int write_ssl_data( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
234 {
235 int ret;
236
237 mbedtls_printf("\n%s", buf);
238 while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
239 {
240 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
241 {
242 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
243 return -1;
244 }
245 }
246
247 return( 0 );
248 }
249
write_ssl_and_get_response(mbedtls_ssl_context * ssl,unsigned char * buf,size_t len)250 static int write_ssl_and_get_response( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
251 {
252 int ret;
253 unsigned char data[128];
254 char code[4];
255 size_t i, idx = 0;
256
257 mbedtls_printf("\n%s", buf);
258 while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
259 {
260 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
261 {
262 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
263 return -1;
264 }
265 }
266
267 do
268 {
269 len = sizeof( data ) - 1;
270 memset( data, 0, sizeof( data ) );
271 ret = mbedtls_ssl_read( ssl, data, len );
272
273 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
274 continue;
275
276 if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
277 return -1;
278
279 if( ret <= 0 )
280 {
281 mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret );
282 return -1;
283 }
284
285 mbedtls_printf("\n%s", data);
286 len = ret;
287 for( i = 0; i < len; i++ )
288 {
289 if( data[i] != '\n' )
290 {
291 if( idx < 4 )
292 code[ idx++ ] = data[i];
293 continue;
294 }
295
296 if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
297 {
298 code[3] = '\0';
299 return atoi( code );
300 }
301
302 idx = 0;
303 }
304 }
305 while( 1 );
306 }
307
write_and_get_response(mbedtls_net_context * sock_fd,unsigned char * buf,size_t len)308 static int write_and_get_response( mbedtls_net_context *sock_fd, unsigned char *buf, size_t len )
309 {
310 int ret;
311 unsigned char data[128];
312 char code[4];
313 size_t i, idx = 0;
314
315 mbedtls_printf("\n%s", buf);
316 if( len && ( ret = mbedtls_net_send( sock_fd, buf, len ) ) <= 0 )
317 {
318 mbedtls_printf( " failed\n ! mbedtls_net_send returned %d\n\n", ret );
319 return -1;
320 }
321
322 do
323 {
324 len = sizeof( data ) - 1;
325 memset( data, 0, sizeof( data ) );
326 ret = mbedtls_net_recv( sock_fd, data, len );
327
328 if( ret <= 0 )
329 {
330 mbedtls_printf( "failed\n ! mbedtls_net_recv returned %d\n\n", ret );
331 return -1;
332 }
333
334 data[len] = '\0';
335 mbedtls_printf("\n%s", data);
336 len = ret;
337 for( i = 0; i < len; i++ )
338 {
339 if( data[i] != '\n' )
340 {
341 if( idx < 4 )
342 code[ idx++ ] = data[i];
343 continue;
344 }
345
346 if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
347 {
348 code[3] = '\0';
349 return atoi( code );
350 }
351
352 idx = 0;
353 }
354 }
355 while( 1 );
356 }
357
main(int argc,char * argv[])358 int main( int argc, char *argv[] )
359 {
360 int ret = 1, len;
361 int exit_code = MBEDTLS_EXIT_FAILURE;
362 mbedtls_net_context server_fd;
363 #if defined(MBEDTLS_BASE64_C)
364 unsigned char base[1024];
365 /* buf is used as the destination buffer for printing base with the format:
366 * "%s\r\n". Hence, the size of buf should be at least the size of base
367 * plus 2 bytes for the \r and \n characters.
368 */
369 unsigned char buf[sizeof( base ) + 2];
370 #else
371 unsigned char buf[1024];
372 #endif
373 char hostname[32];
374 const char *pers = "ssl_mail_client";
375
376 mbedtls_entropy_context entropy;
377 mbedtls_ctr_drbg_context ctr_drbg;
378 mbedtls_ssl_context ssl;
379 mbedtls_ssl_config conf;
380 mbedtls_x509_crt cacert;
381 mbedtls_x509_crt clicert;
382 mbedtls_pk_context pkey;
383 int i;
384 size_t n;
385 char *p, *q;
386 const int *list;
387
388 /*
389 * Make sure memory references are valid in case we exit early.
390 */
391 mbedtls_net_init( &server_fd );
392 mbedtls_ssl_init( &ssl );
393 mbedtls_ssl_config_init( &conf );
394 memset( &buf, 0, sizeof( buf ) );
395 mbedtls_x509_crt_init( &cacert );
396 mbedtls_x509_crt_init( &clicert );
397 mbedtls_pk_init( &pkey );
398 mbedtls_ctr_drbg_init( &ctr_drbg );
399
400 if( argc == 0 )
401 {
402 usage:
403 mbedtls_printf( USAGE );
404
405 list = mbedtls_ssl_list_ciphersuites();
406 while( *list )
407 {
408 mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
409 list++;
410 }
411 mbedtls_printf("\n");
412 goto exit;
413 }
414
415 opt.server_name = DFL_SERVER_NAME;
416 opt.server_port = DFL_SERVER_PORT;
417 opt.debug_level = DFL_DEBUG_LEVEL;
418 opt.authentication = DFL_AUTHENTICATION;
419 opt.mode = DFL_MODE;
420 opt.user_name = DFL_USER_NAME;
421 opt.user_pwd = DFL_USER_PWD;
422 opt.mail_from = DFL_MAIL_FROM;
423 opt.mail_to = DFL_MAIL_TO;
424 opt.ca_file = DFL_CA_FILE;
425 opt.crt_file = DFL_CRT_FILE;
426 opt.key_file = DFL_KEY_FILE;
427 opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
428
429 for( i = 1; i < argc; i++ )
430 {
431 p = argv[i];
432 if( ( q = strchr( p, '=' ) ) == NULL )
433 goto usage;
434 *q++ = '\0';
435
436 if( strcmp( p, "server_name" ) == 0 )
437 opt.server_name = q;
438 else if( strcmp( p, "server_port" ) == 0 )
439 opt.server_port = q;
440 else if( strcmp( p, "debug_level" ) == 0 )
441 {
442 opt.debug_level = atoi( q );
443 if( opt.debug_level < 0 || opt.debug_level > 65535 )
444 goto usage;
445 }
446 else if( strcmp( p, "authentication" ) == 0 )
447 {
448 opt.authentication = atoi( q );
449 if( opt.authentication < 0 || opt.authentication > 1 )
450 goto usage;
451 }
452 else if( strcmp( p, "mode" ) == 0 )
453 {
454 opt.mode = atoi( q );
455 if( opt.mode < 0 || opt.mode > 1 )
456 goto usage;
457 }
458 else if( strcmp( p, "user_name" ) == 0 )
459 opt.user_name = q;
460 else if( strcmp( p, "user_pwd" ) == 0 )
461 opt.user_pwd = q;
462 else if( strcmp( p, "mail_from" ) == 0 )
463 opt.mail_from = q;
464 else if( strcmp( p, "mail_to" ) == 0 )
465 opt.mail_to = q;
466 else if( strcmp( p, "ca_file" ) == 0 )
467 opt.ca_file = q;
468 else if( strcmp( p, "crt_file" ) == 0 )
469 opt.crt_file = q;
470 else if( strcmp( p, "key_file" ) == 0 )
471 opt.key_file = q;
472 else if( strcmp( p, "force_ciphersuite" ) == 0 )
473 {
474 opt.force_ciphersuite[0] = -1;
475
476 opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
477
478 if( opt.force_ciphersuite[0] <= 0 )
479 goto usage;
480
481 opt.force_ciphersuite[1] = 0;
482 }
483 else
484 goto usage;
485 }
486
487 /*
488 * 0. Initialize the RNG and the session data
489 */
490 mbedtls_printf( "\n . Seeding the random number generator..." );
491 fflush( stdout );
492
493 mbedtls_entropy_init( &entropy );
494 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
495 (const unsigned char *) pers,
496 strlen( pers ) ) ) != 0 )
497 {
498 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
499 goto exit;
500 }
501
502 mbedtls_printf( " ok\n" );
503
504 /*
505 * 1.1. Load the trusted CA
506 */
507 mbedtls_printf( " . Loading the CA root certificate ..." );
508 fflush( stdout );
509
510 #if defined(MBEDTLS_FS_IO)
511 if( strlen( opt.ca_file ) )
512 ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
513 else
514 #endif
515 #if defined(MBEDTLS_PEM_PARSE_C)
516 ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
517 mbedtls_test_cas_pem_len );
518 #else
519 {
520 mbedtls_printf("MBEDTLS_PEM_PARSE_C not defined.");
521 goto exit;
522 }
523 #endif
524 if( ret < 0 )
525 {
526 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
527 goto exit;
528 }
529
530 mbedtls_printf( " ok (%d skipped)\n", ret );
531
532 /*
533 * 1.2. Load own certificate and private key
534 *
535 * (can be skipped if client authentication is not required)
536 */
537 mbedtls_printf( " . Loading the client cert. and key..." );
538 fflush( stdout );
539
540 #if defined(MBEDTLS_FS_IO)
541 if( strlen( opt.crt_file ) )
542 ret = mbedtls_x509_crt_parse_file( &clicert, opt.crt_file );
543 else
544 #endif
545 ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
546 mbedtls_test_cli_crt_len );
547 if( ret != 0 )
548 {
549 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
550 goto exit;
551 }
552
553 #if defined(MBEDTLS_FS_IO)
554 if( strlen( opt.key_file ) )
555 {
556 ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, "",
557 mbedtls_ctr_drbg_random, &ctr_drbg );
558 }
559 else
560 #endif
561 #if defined(MBEDTLS_PEM_PARSE_C)
562 {
563 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_cli_key,
564 mbedtls_test_cli_key_len, NULL, 0, mbedtls_ctr_drbg_random, &ctr_drbg );
565 }
566 #else
567 {
568 mbedtls_printf("MBEDTLS_PEM_PARSE_C not defined.");
569 goto exit;
570 }
571 #endif
572 if( ret != 0 )
573 {
574 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
575 goto exit;
576 }
577
578 mbedtls_printf( " ok\n" );
579
580 /*
581 * 2. Start the connection
582 */
583 mbedtls_printf( " . Connecting to tcp/%s/%s...", opt.server_name,
584 opt.server_port );
585 fflush( stdout );
586
587 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
588 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
589 {
590 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
591 goto exit;
592 }
593
594 mbedtls_printf( " ok\n" );
595
596 /*
597 * 3. Setup stuff
598 */
599 mbedtls_printf( " . Setting up the SSL/TLS structure..." );
600 fflush( stdout );
601
602 if( ( ret = mbedtls_ssl_config_defaults( &conf,
603 MBEDTLS_SSL_IS_CLIENT,
604 MBEDTLS_SSL_TRANSPORT_STREAM,
605 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
606 {
607 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
608 goto exit;
609 }
610
611 /* OPTIONAL is not optimal for security,
612 * but makes interop easier in this simplified example */
613 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
614
615 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
616 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
617
618 if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
619 mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
620
621 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
622 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ) ) != 0 )
623 {
624 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
625 goto exit;
626 }
627
628 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
629 {
630 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
631 goto exit;
632 }
633
634 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
635 {
636 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
637 goto exit;
638 }
639
640 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
641
642 mbedtls_printf( " ok\n" );
643
644 if( opt.mode == MODE_SSL_TLS )
645 {
646 if( do_handshake( &ssl ) != 0 )
647 goto exit;
648
649 mbedtls_printf( " > Get header from server:" );
650 fflush( stdout );
651
652 ret = write_ssl_and_get_response( &ssl, buf, 0 );
653 if( ret < 200 || ret > 299 )
654 {
655 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
656 goto exit;
657 }
658
659 mbedtls_printf(" ok\n" );
660
661 mbedtls_printf( " > Write EHLO to server:" );
662 fflush( stdout );
663
664 gethostname( hostname, 32 );
665 len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
666 ret = write_ssl_and_get_response( &ssl, buf, len );
667 if( ret < 200 || ret > 299 )
668 {
669 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
670 goto exit;
671 }
672 }
673 else
674 {
675 mbedtls_printf( " > Get header from server:" );
676 fflush( stdout );
677
678 ret = write_and_get_response( &server_fd, buf, 0 );
679 if( ret < 200 || ret > 299 )
680 {
681 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
682 goto exit;
683 }
684
685 mbedtls_printf(" ok\n" );
686
687 mbedtls_printf( " > Write EHLO to server:" );
688 fflush( stdout );
689
690 gethostname( hostname, 32 );
691 len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
692 ret = write_and_get_response( &server_fd, buf, len );
693 if( ret < 200 || ret > 299 )
694 {
695 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
696 goto exit;
697 }
698
699 mbedtls_printf(" ok\n" );
700
701 mbedtls_printf( " > Write STARTTLS to server:" );
702 fflush( stdout );
703
704 gethostname( hostname, 32 );
705 len = sprintf( (char *) buf, "STARTTLS\r\n" );
706 ret = write_and_get_response( &server_fd, buf, len );
707 if( ret < 200 || ret > 299 )
708 {
709 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
710 goto exit;
711 }
712
713 mbedtls_printf(" ok\n" );
714
715 if( do_handshake( &ssl ) != 0 )
716 goto exit;
717 }
718
719 #if defined(MBEDTLS_BASE64_C)
720 if( opt.authentication )
721 {
722 mbedtls_printf( " > Write AUTH LOGIN to server:" );
723 fflush( stdout );
724
725 len = sprintf( (char *) buf, "AUTH LOGIN\r\n" );
726 ret = write_ssl_and_get_response( &ssl, buf, len );
727 if( ret < 200 || ret > 399 )
728 {
729 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
730 goto exit;
731 }
732
733 mbedtls_printf(" ok\n" );
734
735 mbedtls_printf( " > Write username to server: %s", opt.user_name );
736 fflush( stdout );
737
738 ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_name,
739 strlen( opt.user_name ) );
740
741 if( ret != 0 ) {
742 mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret );
743 goto exit;
744 }
745 len = sprintf( (char *) buf, "%s\r\n", base );
746 ret = write_ssl_and_get_response( &ssl, buf, len );
747 if( ret < 300 || ret > 399 )
748 {
749 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
750 goto exit;
751 }
752
753 mbedtls_printf(" ok\n" );
754
755 mbedtls_printf( " > Write password to server: %s", opt.user_pwd );
756 fflush( stdout );
757
758 ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_pwd,
759 strlen( opt.user_pwd ) );
760
761 if( ret != 0 ) {
762 mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret );
763 goto exit;
764 }
765 len = sprintf( (char *) buf, "%s\r\n", base );
766 ret = write_ssl_and_get_response( &ssl, buf, len );
767 if( ret < 200 || ret > 399 )
768 {
769 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
770 goto exit;
771 }
772
773 mbedtls_printf(" ok\n" );
774 }
775 #endif
776
777 mbedtls_printf( " > Write MAIL FROM to server:" );
778 fflush( stdout );
779
780 len = sprintf( (char *) buf, "MAIL FROM:<%s>\r\n", opt.mail_from );
781 ret = write_ssl_and_get_response( &ssl, buf, len );
782 if( ret < 200 || ret > 299 )
783 {
784 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
785 goto exit;
786 }
787
788 mbedtls_printf(" ok\n" );
789
790 mbedtls_printf( " > Write RCPT TO to server:" );
791 fflush( stdout );
792
793 len = sprintf( (char *) buf, "RCPT TO:<%s>\r\n", opt.mail_to );
794 ret = write_ssl_and_get_response( &ssl, buf, len );
795 if( ret < 200 || ret > 299 )
796 {
797 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
798 goto exit;
799 }
800
801 mbedtls_printf(" ok\n" );
802
803 mbedtls_printf( " > Write DATA to server:" );
804 fflush( stdout );
805
806 len = sprintf( (char *) buf, "DATA\r\n" );
807 ret = write_ssl_and_get_response( &ssl, buf, len );
808 if( ret < 300 || ret > 399 )
809 {
810 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
811 goto exit;
812 }
813
814 mbedtls_printf(" ok\n" );
815
816 mbedtls_printf( " > Write content to server:" );
817 fflush( stdout );
818
819 len = sprintf( (char *) buf, "From: %s\r\nSubject: mbed TLS Test mail\r\n\r\n"
820 "This is a simple test mail from the "
821 "mbed TLS mail client example.\r\n"
822 "\r\n"
823 "Enjoy!", opt.mail_from );
824 ret = write_ssl_data( &ssl, buf, len );
825
826 len = sprintf( (char *) buf, "\r\n.\r\n");
827 ret = write_ssl_and_get_response( &ssl, buf, len );
828 if( ret < 200 || ret > 299 )
829 {
830 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
831 goto exit;
832 }
833
834 mbedtls_printf(" ok\n" );
835
836 mbedtls_ssl_close_notify( &ssl );
837
838 exit_code = MBEDTLS_EXIT_SUCCESS;
839
840 exit:
841
842 mbedtls_net_free( &server_fd );
843 mbedtls_x509_crt_free( &clicert );
844 mbedtls_x509_crt_free( &cacert );
845 mbedtls_pk_free( &pkey );
846 mbedtls_ssl_free( &ssl );
847 mbedtls_ssl_config_free( &conf );
848 mbedtls_ctr_drbg_free( &ctr_drbg );
849 mbedtls_entropy_free( &entropy );
850
851 #if defined(_WIN32)
852 mbedtls_printf( " + Press Enter to exit this program.\n" );
853 fflush( stdout ); getchar();
854 #endif
855
856 mbedtls_exit( exit_code );
857 }
858 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
859 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C **
860 MBEDTLS_CTR_DRBG_C */
861