1 /*
2 * SSL client for SMTP servers
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21
22 /* Enable definition of gethostname() even when compiling with -std=c99. Must
23 * be set before config.h, which pulls in glibc's features.h indirectly.
24 * Harmless on other platforms. */
25 #define _POSIX_C_SOURCE 200112L
26
27 #if !defined(MBEDTLS_CONFIG_FILE)
28 #include "mbedtls/config.h"
29 #else
30 #include MBEDTLS_CONFIG_FILE
31 #endif
32
33 #if defined(MBEDTLS_PLATFORM_C)
34 #include "mbedtls/platform.h"
35 #else
36 #include <stdio.h>
37 #include <stdlib.h>
38 #define mbedtls_time time
39 #define mbedtls_time_t time_t
40 #define mbedtls_fprintf fprintf
41 #define mbedtls_printf printf
42 #define mbedtls_exit exit
43 #define MBEDTLS_EXIT_SUCCESS EXIT_SUCCESS
44 #define MBEDTLS_EXIT_FAILURE EXIT_FAILURE
45 #endif /* MBEDTLS_PLATFORM_C */
46
47 #if !defined(MBEDTLS_BIGNUM_C) || !defined(MBEDTLS_ENTROPY_C) || \
48 !defined(MBEDTLS_SSL_TLS_C) || !defined(MBEDTLS_SSL_CLI_C) || \
49 !defined(MBEDTLS_NET_C) || !defined(MBEDTLS_RSA_C) || \
50 !defined(MBEDTLS_CTR_DRBG_C) || !defined(MBEDTLS_X509_CRT_PARSE_C) || \
51 !defined(MBEDTLS_FS_IO)
main(void)52 int main( void )
53 {
54 mbedtls_printf("MBEDTLS_BIGNUM_C and/or MBEDTLS_ENTROPY_C and/or "
55 "MBEDTLS_SSL_TLS_C and/or MBEDTLS_SSL_CLI_C and/or "
56 "MBEDTLS_NET_C and/or MBEDTLS_RSA_C and/or "
57 "MBEDTLS_CTR_DRBG_C and/or MBEDTLS_X509_CRT_PARSE_C "
58 "not defined.\n");
59 return( 0 );
60 }
61 #else
62
63 #include "mbedtls/base64.h"
64 #include "mbedtls/error.h"
65 #include "mbedtls/net_sockets.h"
66 #include "mbedtls/ssl.h"
67 #include "mbedtls/entropy.h"
68 #include "mbedtls/ctr_drbg.h"
69 #include "mbedtls/certs.h"
70 #include "mbedtls/x509.h"
71
72 #include <stdlib.h>
73 #include <string.h>
74
75 #if !defined(_MSC_VER) || defined(EFIX64) || defined(EFI32)
76 #include <unistd.h>
77 #else
78 #include <io.h>
79 #endif
80
81 #if defined(_WIN32) || defined(_WIN32_WCE)
82 #include <winsock2.h>
83 #include <windows.h>
84
85 #if defined(_MSC_VER)
86 #if defined(_WIN32_WCE)
87 #pragma comment( lib, "ws2.lib" )
88 #else
89 #pragma comment( lib, "ws2_32.lib" )
90 #endif
91 #endif /* _MSC_VER */
92 #endif
93
94 #define DFL_SERVER_NAME "localhost"
95 #define DFL_SERVER_PORT "465"
96 #define DFL_USER_NAME "user"
97 #define DFL_USER_PWD "password"
98 #define DFL_MAIL_FROM ""
99 #define DFL_MAIL_TO ""
100 #define DFL_DEBUG_LEVEL 0
101 #define DFL_CA_FILE ""
102 #define DFL_CRT_FILE ""
103 #define DFL_KEY_FILE ""
104 #define DFL_FORCE_CIPHER 0
105 #define DFL_MODE 0
106 #define DFL_AUTHENTICATION 0
107
108 #define MODE_SSL_TLS 0
109 #define MODE_STARTTLS 0
110
111 #if defined(MBEDTLS_BASE64_C)
112 #define USAGE_AUTH \
113 " authentication=%%d default: 0 (disabled)\n" \
114 " user_name=%%s default: \"user\"\n" \
115 " user_pwd=%%s default: \"password\"\n"
116 #else
117 #define USAGE_AUTH \
118 " authentication options disabled. (Require MBEDTLS_BASE64_C)\n"
119 #endif /* MBEDTLS_BASE64_C */
120
121 #if defined(MBEDTLS_FS_IO)
122 #define USAGE_IO \
123 " ca_file=%%s default: \"\" (pre-loaded)\n" \
124 " crt_file=%%s default: \"\" (pre-loaded)\n" \
125 " key_file=%%s default: \"\" (pre-loaded)\n"
126 #else
127 #define USAGE_IO \
128 " No file operations available (MBEDTLS_FS_IO not defined)\n"
129 #endif /* MBEDTLS_FS_IO */
130
131 #define USAGE \
132 "\n usage: ssl_mail_client param=<>...\n" \
133 "\n acceptable parameters:\n" \
134 " server_name=%%s default: localhost\n" \
135 " server_port=%%d default: 4433\n" \
136 " debug_level=%%d default: 0 (disabled)\n" \
137 " mode=%%d default: 0 (SSL/TLS) (1 for STARTTLS)\n" \
138 USAGE_AUTH \
139 " mail_from=%%s default: \"\"\n" \
140 " mail_to=%%s default: \"\"\n" \
141 USAGE_IO \
142 " force_ciphersuite=<name> default: all enabled\n"\
143 " acceptable ciphersuite names:\n"
144
145 #if defined(MBEDTLS_CHECK_PARAMS)
146 #include "mbedtls/platform_util.h"
mbedtls_param_failed(const char * failure_condition,const char * file,int line)147 void mbedtls_param_failed( const char *failure_condition,
148 const char *file,
149 int line )
150 {
151 mbedtls_printf( "%s:%i: Input param failed - %s\n",
152 file, line, failure_condition );
153 mbedtls_exit( MBEDTLS_EXIT_FAILURE );
154 }
155 #endif
156
157 /*
158 * global options
159 */
160 struct options
161 {
162 const char *server_name; /* hostname of the server (client only) */
163 const char *server_port; /* port on which the ssl service runs */
164 int debug_level; /* level of debugging */
165 int authentication; /* if authentication is required */
166 int mode; /* SSL/TLS (0) or STARTTLS (1) */
167 const char *user_name; /* username to use for authentication */
168 const char *user_pwd; /* password to use for authentication */
169 const char *mail_from; /* E-Mail address to use as sender */
170 const char *mail_to; /* E-Mail address to use as recipient */
171 const char *ca_file; /* the file with the CA certificate(s) */
172 const char *crt_file; /* the file with the client certificate */
173 const char *key_file; /* the file with the client key */
174 int force_ciphersuite[2]; /* protocol/ciphersuite to use, or all */
175 } opt;
176
my_debug(void * ctx,int level,const char * file,int line,const char * str)177 static void my_debug( void *ctx, int level,
178 const char *file, int line,
179 const char *str )
180 {
181 ((void) level);
182
183 mbedtls_fprintf( (FILE *) ctx, "%s:%04d: %s", file, line, str );
184 fflush( (FILE *) ctx );
185 }
186
do_handshake(mbedtls_ssl_context * ssl)187 static int do_handshake( mbedtls_ssl_context *ssl )
188 {
189 int ret;
190 uint32_t flags;
191 unsigned char buf[1024];
192 memset(buf, 0, 1024);
193
194 /*
195 * 4. Handshake
196 */
197 mbedtls_printf( " . Performing the SSL/TLS handshake..." );
198 fflush( stdout );
199
200 while( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
201 {
202 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
203 {
204 #if defined(MBEDTLS_ERROR_C)
205 mbedtls_strerror( ret, (char *) buf, 1024 );
206 #endif
207 mbedtls_printf( " failed\n ! mbedtls_ssl_handshake returned %d: %s\n\n", ret, buf );
208 return( -1 );
209 }
210 }
211
212 mbedtls_printf( " ok\n [ Ciphersuite is %s ]\n",
213 mbedtls_ssl_get_ciphersuite( ssl ) );
214
215 /*
216 * 5. Verify the server certificate
217 */
218 mbedtls_printf( " . Verifying peer X.509 certificate..." );
219
220 /* In real life, we probably want to bail out when ret != 0 */
221 if( ( flags = mbedtls_ssl_get_verify_result( ssl ) ) != 0 )
222 {
223 char vrfy_buf[512];
224
225 mbedtls_printf( " failed\n" );
226
227 mbedtls_x509_crt_verify_info( vrfy_buf, sizeof( vrfy_buf ), " ! ", flags );
228
229 mbedtls_printf( "%s\n", vrfy_buf );
230 }
231 else
232 mbedtls_printf( " ok\n" );
233
234 mbedtls_printf( " . Peer certificate information ...\n" );
235 mbedtls_x509_crt_info( (char *) buf, sizeof( buf ) - 1, " ",
236 mbedtls_ssl_get_peer_cert( ssl ) );
237 mbedtls_printf( "%s\n", buf );
238
239 return( 0 );
240 }
241
write_ssl_data(mbedtls_ssl_context * ssl,unsigned char * buf,size_t len)242 static int write_ssl_data( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
243 {
244 int ret;
245
246 mbedtls_printf("\n%s", buf);
247 while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
248 {
249 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
250 {
251 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
252 return -1;
253 }
254 }
255
256 return( 0 );
257 }
258
write_ssl_and_get_response(mbedtls_ssl_context * ssl,unsigned char * buf,size_t len)259 static int write_ssl_and_get_response( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
260 {
261 int ret;
262 unsigned char data[128];
263 char code[4];
264 size_t i, idx = 0;
265
266 mbedtls_printf("\n%s", buf);
267 while( len && ( ret = mbedtls_ssl_write( ssl, buf, len ) ) <= 0 )
268 {
269 if( ret != MBEDTLS_ERR_SSL_WANT_READ && ret != MBEDTLS_ERR_SSL_WANT_WRITE )
270 {
271 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
272 return -1;
273 }
274 }
275
276 do
277 {
278 len = sizeof( data ) - 1;
279 memset( data, 0, sizeof( data ) );
280 ret = mbedtls_ssl_read( ssl, data, len );
281
282 if( ret == MBEDTLS_ERR_SSL_WANT_READ || ret == MBEDTLS_ERR_SSL_WANT_WRITE )
283 continue;
284
285 if( ret == MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY )
286 return -1;
287
288 if( ret <= 0 )
289 {
290 mbedtls_printf( "failed\n ! mbedtls_ssl_read returned %d\n\n", ret );
291 return -1;
292 }
293
294 mbedtls_printf("\n%s", data);
295 len = ret;
296 for( i = 0; i < len; i++ )
297 {
298 if( data[i] != '\n' )
299 {
300 if( idx < 4 )
301 code[ idx++ ] = data[i];
302 continue;
303 }
304
305 if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
306 {
307 code[3] = '\0';
308 return atoi( code );
309 }
310
311 idx = 0;
312 }
313 }
314 while( 1 );
315 }
316
write_and_get_response(mbedtls_net_context * sock_fd,unsigned char * buf,size_t len)317 static int write_and_get_response( mbedtls_net_context *sock_fd, unsigned char *buf, size_t len )
318 {
319 int ret;
320 unsigned char data[128];
321 char code[4];
322 size_t i, idx = 0;
323
324 mbedtls_printf("\n%s", buf);
325 if( len && ( ret = mbedtls_net_send( sock_fd, buf, len ) ) <= 0 )
326 {
327 mbedtls_printf( " failed\n ! mbedtls_ssl_write returned %d\n\n", ret );
328 return -1;
329 }
330
331 do
332 {
333 len = sizeof( data ) - 1;
334 memset( data, 0, sizeof( data ) );
335 ret = mbedtls_net_recv( sock_fd, data, len );
336
337 if( ret <= 0 )
338 {
339 mbedtls_printf( "failed\n ! read returned %d\n\n", ret );
340 return -1;
341 }
342
343 data[len] = '\0';
344 mbedtls_printf("\n%s", data);
345 len = ret;
346 for( i = 0; i < len; i++ )
347 {
348 if( data[i] != '\n' )
349 {
350 if( idx < 4 )
351 code[ idx++ ] = data[i];
352 continue;
353 }
354
355 if( idx == 4 && code[0] >= '0' && code[0] <= '9' && code[3] == ' ' )
356 {
357 code[3] = '\0';
358 return atoi( code );
359 }
360
361 idx = 0;
362 }
363 }
364 while( 1 );
365 }
366
main(int argc,char * argv[])367 int main( int argc, char *argv[] )
368 {
369 int ret = 1, len;
370 int exit_code = MBEDTLS_EXIT_FAILURE;
371 mbedtls_net_context server_fd;
372 #if defined(MBEDTLS_BASE64_C)
373 unsigned char base[1024];
374 /* buf is used as the destination buffer for printing base with the format:
375 * "%s\r\n". Hence, the size of buf should be at least the size of base
376 * plus 2 bytes for the \r and \n characters.
377 */
378 unsigned char buf[sizeof( base ) + 2];
379 #else
380 unsigned char buf[1024];
381 #endif
382 char hostname[32];
383 const char *pers = "ssl_mail_client";
384
385 mbedtls_entropy_context entropy;
386 mbedtls_ctr_drbg_context ctr_drbg;
387 mbedtls_ssl_context ssl;
388 mbedtls_ssl_config conf;
389 mbedtls_x509_crt cacert;
390 mbedtls_x509_crt clicert;
391 mbedtls_pk_context pkey;
392 int i;
393 size_t n;
394 char *p, *q;
395 const int *list;
396
397 /*
398 * Make sure memory references are valid in case we exit early.
399 */
400 mbedtls_net_init( &server_fd );
401 mbedtls_ssl_init( &ssl );
402 mbedtls_ssl_config_init( &conf );
403 memset( &buf, 0, sizeof( buf ) );
404 mbedtls_x509_crt_init( &cacert );
405 mbedtls_x509_crt_init( &clicert );
406 mbedtls_pk_init( &pkey );
407 mbedtls_ctr_drbg_init( &ctr_drbg );
408
409 if( argc == 0 )
410 {
411 usage:
412 mbedtls_printf( USAGE );
413
414 list = mbedtls_ssl_list_ciphersuites();
415 while( *list )
416 {
417 mbedtls_printf(" %s\n", mbedtls_ssl_get_ciphersuite_name( *list ) );
418 list++;
419 }
420 mbedtls_printf("\n");
421 goto exit;
422 }
423
424 opt.server_name = DFL_SERVER_NAME;
425 opt.server_port = DFL_SERVER_PORT;
426 opt.debug_level = DFL_DEBUG_LEVEL;
427 opt.authentication = DFL_AUTHENTICATION;
428 opt.mode = DFL_MODE;
429 opt.user_name = DFL_USER_NAME;
430 opt.user_pwd = DFL_USER_PWD;
431 opt.mail_from = DFL_MAIL_FROM;
432 opt.mail_to = DFL_MAIL_TO;
433 opt.ca_file = DFL_CA_FILE;
434 opt.crt_file = DFL_CRT_FILE;
435 opt.key_file = DFL_KEY_FILE;
436 opt.force_ciphersuite[0]= DFL_FORCE_CIPHER;
437
438 for( i = 1; i < argc; i++ )
439 {
440 p = argv[i];
441 if( ( q = strchr( p, '=' ) ) == NULL )
442 goto usage;
443 *q++ = '\0';
444
445 if( strcmp( p, "server_name" ) == 0 )
446 opt.server_name = q;
447 else if( strcmp( p, "server_port" ) == 0 )
448 opt.server_port = q;
449 else if( strcmp( p, "debug_level" ) == 0 )
450 {
451 opt.debug_level = atoi( q );
452 if( opt.debug_level < 0 || opt.debug_level > 65535 )
453 goto usage;
454 }
455 else if( strcmp( p, "authentication" ) == 0 )
456 {
457 opt.authentication = atoi( q );
458 if( opt.authentication < 0 || opt.authentication > 1 )
459 goto usage;
460 }
461 else if( strcmp( p, "mode" ) == 0 )
462 {
463 opt.mode = atoi( q );
464 if( opt.mode < 0 || opt.mode > 1 )
465 goto usage;
466 }
467 else if( strcmp( p, "user_name" ) == 0 )
468 opt.user_name = q;
469 else if( strcmp( p, "user_pwd" ) == 0 )
470 opt.user_pwd = q;
471 else if( strcmp( p, "mail_from" ) == 0 )
472 opt.mail_from = q;
473 else if( strcmp( p, "mail_to" ) == 0 )
474 opt.mail_to = q;
475 else if( strcmp( p, "ca_file" ) == 0 )
476 opt.ca_file = q;
477 else if( strcmp( p, "crt_file" ) == 0 )
478 opt.crt_file = q;
479 else if( strcmp( p, "key_file" ) == 0 )
480 opt.key_file = q;
481 else if( strcmp( p, "force_ciphersuite" ) == 0 )
482 {
483 opt.force_ciphersuite[0] = -1;
484
485 opt.force_ciphersuite[0] = mbedtls_ssl_get_ciphersuite_id( q );
486
487 if( opt.force_ciphersuite[0] <= 0 )
488 goto usage;
489
490 opt.force_ciphersuite[1] = 0;
491 }
492 else
493 goto usage;
494 }
495
496 /*
497 * 0. Initialize the RNG and the session data
498 */
499 mbedtls_printf( "\n . Seeding the random number generator..." );
500 fflush( stdout );
501
502 mbedtls_entropy_init( &entropy );
503 if( ( ret = mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
504 (const unsigned char *) pers,
505 strlen( pers ) ) ) != 0 )
506 {
507 mbedtls_printf( " failed\n ! mbedtls_ctr_drbg_seed returned %d\n", ret );
508 goto exit;
509 }
510
511 mbedtls_printf( " ok\n" );
512
513 /*
514 * 1.1. Load the trusted CA
515 */
516 mbedtls_printf( " . Loading the CA root certificate ..." );
517 fflush( stdout );
518
519 #if defined(MBEDTLS_FS_IO)
520 if( strlen( opt.ca_file ) )
521 ret = mbedtls_x509_crt_parse_file( &cacert, opt.ca_file );
522 else
523 #endif
524 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C)
525 ret = mbedtls_x509_crt_parse( &cacert, (const unsigned char *) mbedtls_test_cas_pem,
526 mbedtls_test_cas_pem_len );
527 #else
528 {
529 mbedtls_printf("MBEDTLS_CERTS_C and/or MBEDTLS_PEM_PARSE_C not defined.");
530 goto exit;
531 }
532 #endif
533 if( ret < 0 )
534 {
535 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
536 goto exit;
537 }
538
539 mbedtls_printf( " ok (%d skipped)\n", ret );
540
541 /*
542 * 1.2. Load own certificate and private key
543 *
544 * (can be skipped if client authentication is not required)
545 */
546 mbedtls_printf( " . Loading the client cert. and key..." );
547 fflush( stdout );
548
549 #if defined(MBEDTLS_FS_IO)
550 if( strlen( opt.crt_file ) )
551 ret = mbedtls_x509_crt_parse_file( &clicert, opt.crt_file );
552 else
553 #endif
554 #if defined(MBEDTLS_CERTS_C)
555 ret = mbedtls_x509_crt_parse( &clicert, (const unsigned char *) mbedtls_test_cli_crt,
556 mbedtls_test_cli_crt_len );
557 #else
558 {
559 mbedtls_printf("MBEDTLS_CERTS_C not defined.");
560 goto exit;
561 }
562 #endif
563 if( ret != 0 )
564 {
565 mbedtls_printf( " failed\n ! mbedtls_x509_crt_parse returned %d\n\n", ret );
566 goto exit;
567 }
568
569 #if defined(MBEDTLS_FS_IO)
570 if( strlen( opt.key_file ) )
571 ret = mbedtls_pk_parse_keyfile( &pkey, opt.key_file, "" );
572 else
573 #endif
574 #if defined(MBEDTLS_CERTS_C) && defined(MBEDTLS_PEM_PARSE_C)
575 ret = mbedtls_pk_parse_key( &pkey, (const unsigned char *) mbedtls_test_cli_key,
576 mbedtls_test_cli_key_len, NULL, 0 );
577 #else
578 {
579 mbedtls_printf("MBEDTLS_CERTS_C or MBEDTLS_PEM_PARSE_C not defined.");
580 goto exit;
581 }
582 #endif
583 if( ret != 0 )
584 {
585 mbedtls_printf( " failed\n ! mbedtls_pk_parse_key returned %d\n\n", ret );
586 goto exit;
587 }
588
589 mbedtls_printf( " ok\n" );
590
591 /*
592 * 2. Start the connection
593 */
594 mbedtls_printf( " . Connecting to tcp/%s/%s...", opt.server_name,
595 opt.server_port );
596 fflush( stdout );
597
598 if( ( ret = mbedtls_net_connect( &server_fd, opt.server_name,
599 opt.server_port, MBEDTLS_NET_PROTO_TCP ) ) != 0 )
600 {
601 mbedtls_printf( " failed\n ! mbedtls_net_connect returned %d\n\n", ret );
602 goto exit;
603 }
604
605 mbedtls_printf( " ok\n" );
606
607 /*
608 * 3. Setup stuff
609 */
610 mbedtls_printf( " . Setting up the SSL/TLS structure..." );
611 fflush( stdout );
612
613 if( ( ret = mbedtls_ssl_config_defaults( &conf,
614 MBEDTLS_SSL_IS_CLIENT,
615 MBEDTLS_SSL_TRANSPORT_STREAM,
616 MBEDTLS_SSL_PRESET_DEFAULT ) ) != 0 )
617 {
618 mbedtls_printf( " failed\n ! mbedtls_ssl_config_defaults returned %d\n\n", ret );
619 goto exit;
620 }
621
622 /* OPTIONAL is not optimal for security,
623 * but makes interop easier in this simplified example */
624 mbedtls_ssl_conf_authmode( &conf, MBEDTLS_SSL_VERIFY_OPTIONAL );
625
626 mbedtls_ssl_conf_rng( &conf, mbedtls_ctr_drbg_random, &ctr_drbg );
627 mbedtls_ssl_conf_dbg( &conf, my_debug, stdout );
628
629 if( opt.force_ciphersuite[0] != DFL_FORCE_CIPHER )
630 mbedtls_ssl_conf_ciphersuites( &conf, opt.force_ciphersuite );
631
632 mbedtls_ssl_conf_ca_chain( &conf, &cacert, NULL );
633 if( ( ret = mbedtls_ssl_conf_own_cert( &conf, &clicert, &pkey ) ) != 0 )
634 {
635 mbedtls_printf( " failed\n ! mbedtls_ssl_conf_own_cert returned %d\n\n", ret );
636 goto exit;
637 }
638
639 if( ( ret = mbedtls_ssl_setup( &ssl, &conf ) ) != 0 )
640 {
641 mbedtls_printf( " failed\n ! mbedtls_ssl_setup returned %d\n\n", ret );
642 goto exit;
643 }
644
645 if( ( ret = mbedtls_ssl_set_hostname( &ssl, opt.server_name ) ) != 0 )
646 {
647 mbedtls_printf( " failed\n ! mbedtls_ssl_set_hostname returned %d\n\n", ret );
648 goto exit;
649 }
650
651 mbedtls_ssl_set_bio( &ssl, &server_fd, mbedtls_net_send, mbedtls_net_recv, NULL );
652
653 mbedtls_printf( " ok\n" );
654
655 if( opt.mode == MODE_SSL_TLS )
656 {
657 if( do_handshake( &ssl ) != 0 )
658 goto exit;
659
660 mbedtls_printf( " > Get header from server:" );
661 fflush( stdout );
662
663 ret = write_ssl_and_get_response( &ssl, buf, 0 );
664 if( ret < 200 || ret > 299 )
665 {
666 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
667 goto exit;
668 }
669
670 mbedtls_printf(" ok\n" );
671
672 mbedtls_printf( " > Write EHLO to server:" );
673 fflush( stdout );
674
675 gethostname( hostname, 32 );
676 len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
677 ret = write_ssl_and_get_response( &ssl, buf, len );
678 if( ret < 200 || ret > 299 )
679 {
680 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
681 goto exit;
682 }
683 }
684 else
685 {
686 mbedtls_printf( " > Get header from server:" );
687 fflush( stdout );
688
689 ret = write_and_get_response( &server_fd, buf, 0 );
690 if( ret < 200 || ret > 299 )
691 {
692 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
693 goto exit;
694 }
695
696 mbedtls_printf(" ok\n" );
697
698 mbedtls_printf( " > Write EHLO to server:" );
699 fflush( stdout );
700
701 gethostname( hostname, 32 );
702 len = sprintf( (char *) buf, "EHLO %s\r\n", hostname );
703 ret = write_and_get_response( &server_fd, buf, len );
704 if( ret < 200 || ret > 299 )
705 {
706 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
707 goto exit;
708 }
709
710 mbedtls_printf(" ok\n" );
711
712 mbedtls_printf( " > Write STARTTLS to server:" );
713 fflush( stdout );
714
715 gethostname( hostname, 32 );
716 len = sprintf( (char *) buf, "STARTTLS\r\n" );
717 ret = write_and_get_response( &server_fd, buf, len );
718 if( ret < 200 || ret > 299 )
719 {
720 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
721 goto exit;
722 }
723
724 mbedtls_printf(" ok\n" );
725
726 if( do_handshake( &ssl ) != 0 )
727 goto exit;
728 }
729
730 #if defined(MBEDTLS_BASE64_C)
731 if( opt.authentication )
732 {
733 mbedtls_printf( " > Write AUTH LOGIN to server:" );
734 fflush( stdout );
735
736 len = sprintf( (char *) buf, "AUTH LOGIN\r\n" );
737 ret = write_ssl_and_get_response( &ssl, buf, len );
738 if( ret < 200 || ret > 399 )
739 {
740 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
741 goto exit;
742 }
743
744 mbedtls_printf(" ok\n" );
745
746 mbedtls_printf( " > Write username to server: %s", opt.user_name );
747 fflush( stdout );
748
749 ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_name,
750 strlen( opt.user_name ) );
751
752 if( ret != 0 ) {
753 mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret );
754 goto exit;
755 }
756 len = sprintf( (char *) buf, "%s\r\n", base );
757 ret = write_ssl_and_get_response( &ssl, buf, len );
758 if( ret < 300 || ret > 399 )
759 {
760 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
761 goto exit;
762 }
763
764 mbedtls_printf(" ok\n" );
765
766 mbedtls_printf( " > Write password to server: %s", opt.user_pwd );
767 fflush( stdout );
768
769 ret = mbedtls_base64_encode( base, sizeof( base ), &n, (const unsigned char *) opt.user_pwd,
770 strlen( opt.user_pwd ) );
771
772 if( ret != 0 ) {
773 mbedtls_printf( " failed\n ! mbedtls_base64_encode returned %d\n\n", ret );
774 goto exit;
775 }
776 len = sprintf( (char *) buf, "%s\r\n", base );
777 ret = write_ssl_and_get_response( &ssl, buf, len );
778 if( ret < 200 || ret > 399 )
779 {
780 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
781 goto exit;
782 }
783
784 mbedtls_printf(" ok\n" );
785 }
786 #endif
787
788 mbedtls_printf( " > Write MAIL FROM to server:" );
789 fflush( stdout );
790
791 len = sprintf( (char *) buf, "MAIL FROM:<%s>\r\n", opt.mail_from );
792 ret = write_ssl_and_get_response( &ssl, buf, len );
793 if( ret < 200 || ret > 299 )
794 {
795 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
796 goto exit;
797 }
798
799 mbedtls_printf(" ok\n" );
800
801 mbedtls_printf( " > Write RCPT TO to server:" );
802 fflush( stdout );
803
804 len = sprintf( (char *) buf, "RCPT TO:<%s>\r\n", opt.mail_to );
805 ret = write_ssl_and_get_response( &ssl, buf, len );
806 if( ret < 200 || ret > 299 )
807 {
808 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
809 goto exit;
810 }
811
812 mbedtls_printf(" ok\n" );
813
814 mbedtls_printf( " > Write DATA to server:" );
815 fflush( stdout );
816
817 len = sprintf( (char *) buf, "DATA\r\n" );
818 ret = write_ssl_and_get_response( &ssl, buf, len );
819 if( ret < 300 || ret > 399 )
820 {
821 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
822 goto exit;
823 }
824
825 mbedtls_printf(" ok\n" );
826
827 mbedtls_printf( " > Write content to server:" );
828 fflush( stdout );
829
830 len = sprintf( (char *) buf, "From: %s\r\nSubject: mbed TLS Test mail\r\n\r\n"
831 "This is a simple test mail from the "
832 "mbed TLS mail client example.\r\n"
833 "\r\n"
834 "Enjoy!", opt.mail_from );
835 ret = write_ssl_data( &ssl, buf, len );
836
837 len = sprintf( (char *) buf, "\r\n.\r\n");
838 ret = write_ssl_and_get_response( &ssl, buf, len );
839 if( ret < 200 || ret > 299 )
840 {
841 mbedtls_printf( " failed\n ! server responded with %d\n\n", ret );
842 goto exit;
843 }
844
845 mbedtls_printf(" ok\n" );
846
847 mbedtls_ssl_close_notify( &ssl );
848
849 exit_code = MBEDTLS_EXIT_SUCCESS;
850
851 exit:
852
853 mbedtls_net_free( &server_fd );
854 mbedtls_x509_crt_free( &clicert );
855 mbedtls_x509_crt_free( &cacert );
856 mbedtls_pk_free( &pkey );
857 mbedtls_ssl_free( &ssl );
858 mbedtls_ssl_config_free( &conf );
859 mbedtls_ctr_drbg_free( &ctr_drbg );
860 mbedtls_entropy_free( &entropy );
861
862 #if defined(_WIN32)
863 mbedtls_printf( " + Press Enter to exit this program.\n" );
864 fflush( stdout ); getchar();
865 #endif
866
867 return( exit_code );
868 }
869 #endif /* MBEDTLS_BIGNUM_C && MBEDTLS_ENTROPY_C && MBEDTLS_SSL_TLS_C &&
870 MBEDTLS_SSL_CLI_C && MBEDTLS_NET_C && MBEDTLS_RSA_C **
871 MBEDTLS_CTR_DRBG_C */
872