nslookup: add openwrt / lede version
[oweals/busybox.git] / networking / ssl_helper-wolfssl / ssl_helper.c
1 /*
2  * Adapted from:
3  *
4  * client.c
5  *
6  * Copyright (C) 2006-2015 wolfSSL Inc.
7  *
8  * This file is part of wolfSSL. (formerly known as CyaSSL)
9  *
10  * wolfSSL is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * wolfSSL is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * You should have received a copy of the GNU General Public License
21  * along with this program; if not, write to the Free Software
22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
23  */
24 #include <stdlib.h>
25 #include <unistd.h>
26 #include <stdarg.h>
27 #include <string.h>
28 #include <errno.h>
29 #include <fcntl.h>
30 #include <stdio.h>
31 #include <time.h>
32 #include <poll.h>
33 #include <sys/socket.h>
34
35 #include <wolfssl/wolfcrypt/types.h>
36 #include <wolfssl/ssl.h>
37
38 #if 0
39 # define dbg(...) say(__VA_ARGS__)
40 #else
41 # define dbg(...) ((void)0)
42 #endif
43
44 static ssize_t safe_write(int fd, const void *buf, size_t count)
45 {
46         ssize_t n;
47
48         do {
49                 n = write(fd, buf, count);
50         } while (n < 0 && errno == EINTR);
51
52         return n;
53 }
54
55 static ssize_t full_write(int fd, const void *buf, size_t len)
56 {
57         ssize_t cc;
58         ssize_t total;
59
60         total = 0;
61
62         while (len) {
63                 cc = safe_write(fd, buf, len);
64
65                 if (cc < 0) {
66                         if (total) {
67                                 /* we already wrote some! */
68                                 /* user can do another write to know the error code */
69                                 return total;
70                         }
71                         return cc;  /* write() returns -1 on failure. */
72                 }
73
74                 total += cc;
75                 buf = ((const char *)buf) + cc;
76                 len -= cc;
77         }
78
79         return total;
80 }
81
82 static void say(const char *s, ...)
83 {
84         char buf[256];
85         va_list p;
86         int sz;
87
88         va_start(p, s);
89         sz = vsnprintf(buf, sizeof(buf), s, p);
90         full_write(STDERR_FILENO, buf, sz >= 0 && sz < sizeof(buf) ? sz : strlen(buf));
91         va_end(p);
92 }
93
94 static void die(const char *s, ...)
95 {
96         char buf[256];
97         va_list p;
98         int sz;
99
100         va_start(p, s);
101         sz = vsnprintf(buf, sizeof(buf), s, p);
102         full_write(STDERR_FILENO, buf, sz >= 0 && sz < sizeof(buf) ? sz : strlen(buf));
103         exit(1);
104         va_end(p);
105 }
106
107 static void err_sys(const char *msg)
108 {
109         die("%s\n", msg);
110 }
111
112 /* ==== */
113
114 #if 0
115 static void showPeer(WOLFSSL* ssl)
116 {
117         WOLFSSL_CIPHER* cipher;
118         WOLFSSL_X509* peer = wolfSSL_get_peer_certificate(ssl);
119         if (peer)
120                 ShowX509(peer, "peer's cert info:");
121         else
122                 say("peer has no cert!\n");
123         say("SSL version is %s\n", wolfSSL_get_version(ssl));
124
125         cipher = wolfSSL_get_current_cipher(ssl);
126         say("SSL cipher suite is %s\n", wolfSSL_CIPHER_get_name(cipher));
127
128         {
129                 WOLFSSL_X509_CHAIN* chain = wolfSSL_get_peer_chain(ssl);
130                 int count = wolfSSL_get_chain_count(chain);
131                 int i;
132
133                 for (i = 0; i < count; i++) {
134                         int length;
135                         unsigned char buffer[3072];
136                         WOLFSSL_X509* chainX509;
137
138                         wolfSSL_get_chain_cert_pem(chain, i, buffer, sizeof(buffer), &length);
139                         buffer[length] = 0;
140                         say("cert %d has length %d data = \n%s\n", i, length, buffer);
141
142                         chainX509 = wolfSSL_get_chain_X509(chain, i);
143                         if (chainX509)
144                                 ShowX509(chainX509, "session cert info:");
145                         else
146                                 say("get_chain_X509 failed\n");
147                         wolfSSL_FreeX509(chainX509);
148                 }
149         }
150 }
151 #endif
152
153 WOLFSSL *prepare(int sockfd)
154 {
155         WOLFSSL_METHOD* method;
156         WOLFSSL_CTX* ctx;
157         WOLFSSL* ssl;
158
159         wolfSSL_Init();
160
161         method = wolfTLSv1_1_client_method();
162         if (method == NULL)
163                 err_sys("out of memory");
164         ctx = wolfSSL_CTX_new(method);
165         if (ctx == NULL)
166                 err_sys("out of memory");
167 //      if (cipherList)
168 //              if (wolfSSL_CTX_set_cipher_list(ctx, cipherList) != SSL_SUCCESS)
169 //                      err_sys("client can't set cipher list 1");
170
171 //      if (fewerPackets)
172 //              wolfSSL_CTX_set_group_messages(ctx);
173
174 //#ifndef NO_DH
175 //      wolfSSL_CTX_SetMinDhKey_Sz(ctx, (word16)minDhKeyBits);
176 //#endif
177
178 //      if (usePsk) {
179 //              wolfSSL_CTX_set_psk_client_callback(ctx, my_psk_client_cb);
180 //              if (cipherList == NULL) {
181 //                      const char *defaultCipherList;
182 //#if defined(HAVE_AESGCM) && !defined(NO_DH)
183 //                      defaultCipherList = "DHE-PSK-AES128-GCM-SHA256";
184 //#elif defined(HAVE_NULL_CIPHER)
185 //                      defaultCipherList = "PSK-NULL-SHA256";
186 //#else
187 //                      defaultCipherList = "PSK-AES128-CBC-SHA256";
188 //#endif
189 //                      if (wolfSSL_CTX_set_cipher_list(ctx,defaultCipherList) != SSL_SUCCESS)
190 //                              err_sys("client can't set cipher list 2");
191 //              }
192 //              useClientCert = 0;
193 //      }
194
195 //      if (useAnon) {
196 //              if (cipherList == NULL) {
197 //                      wolfSSL_CTX_allow_anon_cipher(ctx);
198 //                      if (wolfSSL_CTX_set_cipher_list(ctx,"ADH-AES128-SHA") != SSL_SUCCESS)
199 //                              err_sys("client can't set cipher list 4");
200 //              }
201 //              useClientCert = 0;
202 //      }
203
204 //#if defined(OPENSSL_EXTRA) || defined(HAVE_WEBSERVER)
205 //      wolfSSL_CTX_set_default_passwd_cb(ctx, PasswordCallBack);
206 //#endif
207
208 //      if (useOcsp) {
209 //              if (ocspUrl != NULL) {
210 //                      wolfSSL_CTX_SetOCSP_OverrideURL(ctx, ocspUrl);
211 //                      wolfSSL_CTX_EnableOCSP(ctx, WOLFSSL_OCSP_NO_NONCE
212 //                                      | WOLFSSL_OCSP_URL_OVERRIDE);
213 //              }
214 //              else
215 //                      wolfSSL_CTX_EnableOCSP(ctx, WOLFSSL_OCSP_NO_NONCE);
216 //      }
217 //
218 //#ifdef USER_CA_CB
219 //      wolfSSL_CTX_SetCACb(ctx, CaCb);
220 //#endif
221 //
222 //#ifdef VERIFY_CALLBACK
223 //      wolfSSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, myVerify);
224 //#endif
225 //#if !defined(NO_FILESYSTEM) && !defined(NO_CERTS)
226 //      if (useClientCert) {
227 //              if (wolfSSL_CTX_use_certificate_chain_file(ctx, ourCert) != SSL_SUCCESS)
228 //                      err_sys("can't load client cert file, check file and run from"
229 //                              " wolfSSL home dir");
230 //              if (wolfSSL_CTX_use_PrivateKey_file(ctx, ourKey, SSL_FILETYPE_PEM) != SSL_SUCCESS)
231 //                      err_sys("can't load client private key file, check file and run "
232 //                              "from wolfSSL home dir");
233 //      }
234 //
235 //      if (!usePsk && !useAnon) {
236 //              if (wolfSSL_CTX_load_verify_locations(ctx, verifyCert,0) != SSL_SUCCESS)
237 //                      err_sys("can't load ca file, Please run from wolfSSL home dir");
238 //#ifdef HAVE_ECC
239 //              /* load ecc verify too, echoserver uses it by default w/ ecc */
240 //              if (wolfSSL_CTX_load_verify_locations(ctx, eccCert, 0) != SSL_SUCCESS)
241 //                      err_sys("can't load ecc ca file, Please run from wolfSSL home dir");
242 //#endif
243 //      }
244 //#endif /* !NO_FILESYSTEM && !NO_CERTS */
245
246 //#if !defined(NO_CERTS)
247 //      if (!usePsk && !useAnon && doPeerCheck == 0)
248 //              wolfSSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, 0);
249 //      if (!usePsk && !useAnon && overrideDateErrors == 1)
250 //              wolfSSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, myDateCb);
251 //#endif
252
253         wolfSSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, 0);
254
255 //#ifdef HAVE_SNI
256 //      if (sniHostName)
257 //              if (wolfSSL_CTX_UseSNI(ctx, 0, sniHostName, XSTRLEN(sniHostName)) != SSL_SUCCESS)
258 //                      err_sys("UseSNI failed");
259 //#endif
260
261 //#ifdef HAVE_MAX_FRAGMENT
262 //      if (maxFragment)
263 //              if (wolfSSL_CTX_UseMaxFragment(ctx, maxFragment) != SSL_SUCCESS)
264 //                      err_sys("UseMaxFragment failed");
265 //#endif
266 //#ifdef HAVE_TRUNCATED_HMAC
267 //      if (truncatedHMAC)
268 //              if (wolfSSL_CTX_UseTruncatedHMAC(ctx) != SSL_SUCCESS)
269 //                      err_sys("UseTruncatedHMAC failed");
270 //#endif
271 //#ifdef HAVE_SESSION_TICKET
272 //      if (wolfSSL_CTX_UseSessionTicket(ctx) != SSL_SUCCESS)
273 //              err_sys("UseSessionTicket failed");
274 //#endif
275
276 //#if defined(WOLFSSL_MDK_ARM)
277 //      wolfSSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, 0);
278 //#endif
279
280         ssl = wolfSSL_new(ctx);
281         if (ssl == NULL)
282                 err_sys("out of memory");
283
284 //#ifdef HAVE_SESSION_TICKET
285 //      wolfSSL_set_SessionTicket_cb(ssl, sessionTicketCB, (void*)"initial session");
286 //#endif
287
288 //      if (doDTLS) {
289 //              SOCKADDR_IN_T addr;
290 //              build_addr(&addr, host, port, 1);
291 //              wolfSSL_dtls_set_peer(ssl, &addr, sizeof(addr));
292 //              tcp_socket(&sockfd, 1);
293 //      } wlse {
294 //              tcp_connect(&sockfd, host, port, 0);
295 //      }
296
297 //#ifdef HAVE_POLY1305
298 //      /* use old poly to connect with google server */
299 //      if (!XSTRNCMP(domain, "www.google.com", 14)) {
300 //              if (wolfSSL_use_old_poly(ssl, 1) != 0)
301 //                      err_sys("unable to set to old poly");
302 //      }
303 //#endif
304
305         wolfSSL_set_fd(ssl, sockfd);
306
307 //#ifdef HAVE_CRL
308 //      if (disableCRL == 0) {
309 //              if (wolfSSL_EnableCRL(ssl, WOLFSSL_CRL_CHECKALL) != SSL_SUCCESS)
310 //                      err_sys("can't enable crl check");
311 //              if (wolfSSL_LoadCRL(ssl, crlPemDir, SSL_FILETYPE_PEM, 0) != SSL_SUCCESS)
312 //                      err_sys("can't load crl, check crlfile and date validity");
313 //              if (wolfSSL_SetCRL_Cb(ssl, CRL_CallBack) != SSL_SUCCESS)
314 //                      err_sys("can't set crl callback");
315 //      }
316 //#endif
317 //#ifdef HAVE_SECURE_RENEGOTIATION
318 //      if (scr) {
319 //              if (wolfSSL_UseSecureRenegotiation(ssl) != SSL_SUCCESS)
320 //                      err_sys("can't enable secure renegotiation");
321 //      }
322 //#endif
323 //#ifdef ATOMIC_USER
324 //      if (atomicUser)
325 //              SetupAtomicUser(ctx, ssl);
326 //#endif
327 //#ifdef HAVE_PK_CALLBACKS
328 //      if (pkCallbacks)
329 //              SetupPkCallbacks(ctx, ssl);
330 //#endif
331 //      if (matchName && doPeerCheck)
332 //              wolfSSL_check_domain_name(ssl, domain);
333
334         if (wolfSSL_connect(ssl) != SSL_SUCCESS) {
335 //              /* see note at top of README */
336 //              int  err = wolfSSL_get_error(ssl, 0);
337 //              char buffer[WOLFSSL_MAX_ERROR_SZ];
338 //              say("err = %d, %s\n", err,
339 //                      wolfSSL_ERR_error_string(err, buffer));
340                 err_sys("SSL_connect failed");
341         }
342 //      showPeer(ssl);
343
344 //#ifdef HAVE_SECURE_RENEGOTIATION
345 //      if (scr && forceScr) {
346 //              if (wolfSSL_Rehandshake(ssl) != SSL_SUCCESS) {
347 //                      int err = wolfSSL_get_error(ssl, 0);
348 //                      char buffer[WOLFSSL_MAX_ERROR_SZ];
349 //                      say("err = %d, %s\n", err,
350 //                              wolfSSL_ERR_error_string(err, buffer));
351 //                      err_sys("wolfSSL_Rehandshake failed");
352 //              }
353 //      }
354 //#endif
355
356         return ssl;
357 }
358
359 static struct pollfd pfd[2] = {
360         { -1, POLLIN|POLLERR|POLLHUP, 0 },
361         { -1, POLLIN|POLLERR|POLLHUP, 0 },
362 };
363 #define STDIN           pfd[0]
364 #define NETWORK         pfd[1]
365 #define STDIN_READY()   (pfd[0].revents & (POLLIN|POLLERR|POLLHUP))
366 #define NETWORK_READY() (pfd[1].revents & (POLLIN|POLLERR|POLLHUP))
367
368 static void wait_for_input(void)
369 {
370         if (STDIN.fd == NETWORK.fd) /* means both are -1 */
371                 exit(0);
372         dbg("polling\n");
373         STDIN.revents = NETWORK.revents = 0;
374         while (poll(pfd, 2, -1) < 0 && errno == EINTR)
375                 continue;
376 }
377
378 static void do_io_until_eof_and_exit(WOLFSSL *ssl, int fd)
379 {
380         int len;
381         char ibuf[4 * 1024];
382
383         NETWORK.fd = fd;
384         STDIN.fd = 0;
385
386         len = 0; /* only to suppress compiler warning */
387         for (;;) {
388                 wait_for_input();
389
390                 if (STDIN_READY()) {
391                         dbg("reading stdin\n");
392                         len = read(STDIN_FILENO, ibuf, sizeof(ibuf));
393                         if (len < 0)
394                                 die("read error on stdin\n");
395                         if (len == 0) {
396                                 dbg("read len = 0, stdin not polled anymore\n");
397                                 STDIN.fd = -1;
398                         } else {
399                                 int n = wolfSSL_write(ssl, ibuf, len);
400                                 if (n != len)
401                                         die("SSL_write(%d) failed (returned %d)\n", len, n);
402                         }
403                 }
404
405                 if (NETWORK_READY()) {
406                         dbg("%s%s%s\n",
407                                 (pfd[1].revents & POLLIN)  ? "POLLIN"  : "",
408                                 (pfd[1].revents & POLLERR) ? "|POLLERR" : "",
409                                 (pfd[1].revents & POLLHUP) ? "|POLLHUP" : ""
410                         );
411 /* We are using blocking socket here.
412  * (Nonblocking socket would complicate writing to it).
413  * Therefore, SSL_read _can block_ here.
414  * This is not what wget expects (it wants to see short reads).
415  * Therefore, we use smallish buffer here, to approximate that.
416  */
417                         len = wolfSSL_read(ssl, ibuf,
418                                 sizeof(ibuf) < 1024 ? sizeof(ibuf) : 1024
419                         );
420                         if (len < 0)
421                                 die("SSL_read error on network (%d)\n", len);
422                         if (len > 0) {
423                                 int n;
424                                 n = full_write(STDOUT_FILENO, ibuf, len);
425                                 if (n != len)
426                                         die("write(%d) to stdout returned %d\n", len, n);
427                                 continue;
428                         }
429 /* Blocking reads are easier wtr EOF detection (no EAGAIN error to check for) */
430                         dbg("read len = 0, network not polled anymore\n");
431                         NETWORK.fd = -1;
432                         /* saw EOF on network, and we processed
433                          * and wrote out all ssl data. Signal it:
434                          */
435                         close(STDOUT_FILENO);
436                 }
437         }
438 }
439
440 int main(int argc, char **argv)
441 {
442         WOLFSSL *ssl;
443         int fd;
444         char *fd_str;
445
446         if (!argv[1])
447                 die("Syntax error\n");
448         if (argv[1][0] != '-')
449                 die("Syntax error\n");
450         if (argv[1][1] != 'd')
451                 die("Syntax error\n");
452         fd_str = argv[1] + 2;
453         if (!fd_str[0])
454                 fd_str = argv[2];
455         if (!fd_str || fd_str[0] < '0' || fd_str[0] > '9')
456                 die("Syntax error\n");
457
458         fd = atoi(fd_str);
459         if (fd < 3)
460                 die("Syntax error\n");
461
462         ssl = prepare(fd);
463         do_io_until_eof_and_exit(ssl, fd);
464         /* does not return */
465
466 //      if (doDTLS == 0) { /* don't send alert after "break" command */
467 //              ret = wolfSSL_shutdown(ssl);
468 //              if (wc_shutdown && ret == SSL_SHUTDOWN_NOT_DONE)
469 //                      wolfSSL_shutdown(ssl); /* bidirectional shutdown */
470 //      }
471 //#ifdef ATOMIC_USER
472 //      if (atomicUser)
473 //              FreeAtomicUser(ssl);
474 //#endif
475 //      wolfSSL_free(ssl);
476 //      CloseSocket(sockfd);
477 //      wolfSSL_CTX_free(ctx);
478
479         return 0;
480 }