libratbox/src/gnutls.c

   1 /*
   2  *  libratbox: a library used by ircd-ratbox and other things
   3  *  gnutls.c: gnutls related code
   4  *
   5  *  Copyright (C) 2007-2008 ircd-ratbox development team
   6  *  Copyright (C) 2007-2008 Aaron Sethman <androsyn@ratbox.org>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301
  21  *  USA
  22  *
  23  *  $Id: gnutls.c 25568 2008-06-20 18:46:08Z androsyn $
  24  */
  25
  26 #include <libratbox_config.h>
  27 #include <ratbox_lib.h>
  28 #include <commio-int.h>
  29 #include <commio-ssl.h>
  30 #ifdef HAVE_GNUTLS
  31
  32 #include <gnutls/gnutls.h>
  33 #include <gcrypt.h>
  34
  35 static gnutls_certificate_credentials x509;
  36 static gnutls_dh_params dh_params;
  37
  38
  39
  40 #define SSL_P(x) *((gnutls_session_t *)F->ssl)
  41
  42 void
  43 rb_ssl_shutdown(rb_fde_t * F)
  44 {
  45         int i;
  46         if(F == NULL || F->ssl == NULL)
  47                 return;
  48         for (i = 0; i < 4; i++)
  49         {
  50                 if(gnutls_bye(SSL_P(F), GNUTLS_SHUT_RDWR) == GNUTLS_E_SUCCESS)
  51                         break;
  52         }
  53         gnutls_deinit(SSL_P(F));
  54         rb_free(F->ssl);
  55 }
  56
  57 unsigned int
  58 rb_ssl_handshake_count(rb_fde_t *F)
  59 {
  60         return F->handshake_count;
  61 }
  62
  63 void
  64 rb_ssl_clear_handshake_count(rb_fde_t *F)
  65 {
  66         F->handshake_count = 0;
  67 }
  68
  69 static void
  70 rb_ssl_timeout(rb_fde_t * F, void *notused)
  71 {
  72         lrb_assert(F->accept != NULL);
  73         F->accept->callback(F, RB_ERR_TIMEOUT, NULL, 0, F->accept->data);
  74 }
  75
  76
  77 static int do_ssl_handshake(rb_fde_t *F, PF *callback)
  78 {
  79         int ret;
  80         int flags;
  81
  82         ret = gnutls_handshake(SSL_P(F));
  83         if(ret < 0)
  84         {
  85                 if((ret == GNUTLS_E_INTERRUPTED && rb_ignore_errno(errno)) || ret == GNUTLS_E_AGAIN)
  86                 {
  87                         if(gnutls_record_get_direction(SSL_P(F)) == 0)
  88                                 flags = RB_SELECT_READ;
  89                         else
  90                                 flags = RB_SELECT_WRITE;
  91                         rb_setselect(F, flags, callback, NULL);
  92                         return 0;
  93                 }
  94                 F->ssl_errno = ret;
  95                 return -1;
  96         }
  97         return 1; /* handshake is finished..go about life */
  98 }
  99
 100 static void
 101 rb_ssl_tryaccept(rb_fde_t * F, void *data)
 102 {
 103         int ret;
 104         struct acceptdata *ad;
 105
 106         lrb_assert(F->accept != NULL);
 107
 108         ret = do_ssl_handshake(F, rb_ssl_tryaccept);
 109
 110         switch(ret)
 111         {
 112                 case -1:
 113                         F->accept->callback(F, RB_ERROR_SSL, NULL, 0, F->accept->data);
 114                         break;
 115                 case 0:
 116                         /* do_ssl_handshake does the rb_setselect stuff */
 117                         return;
 118                 default:
 119                         break;
 120
 121
 122         }
 123         rb_settimeout(F, 0, NULL, NULL);
 124         rb_setselect(F, RB_SELECT_READ | RB_SELECT_WRITE, NULL, NULL);
 125
 126         ad = F->accept;
 127         F->accept = NULL;
 128         ad->callback(F, RB_OK, (struct sockaddr *) &ad->S, ad->addrlen,
 129                             ad->data);
 130         rb_free(ad);
 131
 132 }
 133
 134 void
 135 rb_ssl_start_accepted(rb_fde_t * new_F, ACCB * cb, void *data, int timeout)
 136 {
 137         gnutls_session_t *ssl;
 138         new_F->type |= RB_FD_SSL;
 139         ssl = new_F->ssl = rb_malloc(sizeof(gnutls_session_t));
 140         new_F->accept = rb_malloc(sizeof(struct acceptdata));
 141
 142         new_F->accept->callback = cb;
 143         new_F->accept->data = data;
 144         rb_settimeout(new_F, timeout, rb_ssl_timeout, NULL);
 145
 146         new_F->accept->addrlen = 0;
 147
 148         gnutls_init(ssl, GNUTLS_SERVER);
 149         gnutls_set_default_priority(*ssl);
 150         gnutls_credentials_set(*ssl, GNUTLS_CRD_CERTIFICATE, x509);
 151         gnutls_dh_set_prime_bits(*ssl, 1024);
 152         gnutls_transport_set_ptr(*ssl, (gnutls_transport_ptr_t) (long int)new_F->fd);
 153         if(do_ssl_handshake(new_F, rb_ssl_tryaccept))
 154         {
 155                 struct acceptdata *ad = new_F->accept;
 156                 new_F->accept = NULL;
 157                 ad->callback(new_F, RB_OK, (struct sockaddr *) &ad->S, ad->addrlen, ad->data);
 158                 rb_free(ad);
 159         }
 160
 161 }
 162
 163
 164
 165
 166 void
 167 rb_ssl_accept_setup(rb_fde_t * F, int new_fd, struct sockaddr *st, int addrlen)
 168 {
 169         rb_fde_t *new_F;
 170
 171         new_F = rb_find_fd(new_fd);
 172         new_F->type |= RB_FD_SSL;
 173         new_F->ssl = rb_malloc(sizeof(gnutls_session_t));
 174         new_F->accept = rb_malloc(sizeof(struct acceptdata));
 175
 176         new_F->accept->callback = F->accept->callback;
 177         new_F->accept->data = F->accept->data;
 178         rb_settimeout(new_F, 10, rb_ssl_timeout, NULL);
 179         memcpy(&new_F->accept->S, st, addrlen);
 180         new_F->accept->addrlen = addrlen;
 181
 182         gnutls_init((gnutls_session_t *)new_F->ssl, GNUTLS_SERVER);
 183         gnutls_set_default_priority(SSL_P(new_F));
 184         gnutls_credentials_set(SSL_P(new_F), GNUTLS_CRD_CERTIFICATE, x509);
 185         gnutls_dh_set_prime_bits(SSL_P(new_F), 1024);
 186         gnutls_transport_set_ptr(SSL_P(new_F), (gnutls_transport_ptr_t) (long int)new_fd);
 187         if(do_ssl_handshake(F, rb_ssl_tryaccept))
 188         {
 189                 struct acceptdata *ad = F->accept;
 190                 F->accept = NULL;
 191                 ad->callback(F, RB_OK, (struct sockaddr *) &ad->S, ad->addrlen, ad->data);
 192                 rb_free(ad);
 193         }
 194 }
 195
 196
 197
 198
 199 static ssize_t
 200 rb_ssl_read_or_write(int r_or_w, rb_fde_t * F, void *rbuf, const void *wbuf, size_t count)
 201 {
 202         ssize_t ret;
 203         gnutls_session_t *ssl = F->ssl;
 204
 205         if(r_or_w == 0)
 206                 ret = gnutls_record_recv(*ssl, rbuf, count);
 207         else
 208                 ret = gnutls_record_send(*ssl, wbuf, count);
 209
 210         if(ret < 0)
 211         {
 212                 switch(ret)
 213                 {
 214                 case GNUTLS_E_AGAIN:
 215                 case GNUTLS_E_INTERRUPTED:
 216                         if(rb_ignore_errno(errno))
 217                         {
 218                                 if(gnutls_record_get_direction(*ssl) == 0)
 219                                         return RB_RW_SSL_NEED_READ;
 220                                 else
 221                                         return RB_RW_SSL_NEED_WRITE;
 222                                 break;
 223                         }
 224                 default:
 225                         F->ssl_errno = ret;
 226                         errno = EIO;
 227                         return RB_RW_IO_ERROR;
 228                 }
 229         }
 230         return ret;
 231 }
 232
 233 ssize_t
 234 rb_ssl_read(rb_fde_t * F, void *buf, size_t count)
 235 {
 236         return rb_ssl_read_or_write(0, F, buf, NULL, count);
 237 }
 238
 239 ssize_t
 240 rb_ssl_write(rb_fde_t * F, const void *buf, size_t count)
 241 {
 242         return rb_ssl_read_or_write(1, F, NULL, buf, count);
 243 }
 244
 245 static void
 246 rb_gcry_random_seed(void *unused)
 247 {
 248         gcry_fast_random_poll();
 249 }
 250
 251 int
 252 rb_init_ssl(void)
 253 {
 254         gnutls_global_init();
 255
 256         if(gnutls_certificate_allocate_credentials(&x509) != GNUTLS_E_SUCCESS)
 257         {
 258                 rb_lib_log("rb_init_ssl: Unable to allocate SSL/TLS certificate credentials");
 259                 return 0;
 260         }
 261         rb_event_addish("rb_gcry_random_seed", rb_gcry_random_seed, NULL, 300);
 262         return 1;
 263 }
 264
 265 static void
 266 rb_free_datum_t(gnutls_datum_t *d)
 267 {
 268         rb_free(d->data);
 269         rb_free(d);
 270 }
 271
 272 static gnutls_datum_t *
 273 rb_load_file_into_datum_t(const char *file)
 274 {
 275         FILE *f;
 276         gnutls_datum_t *datum;
 277         struct stat fileinfo;
 278         if((f = fopen(file, "r")) == NULL)
 279                 return NULL;
 280         if(fstat(fileno(f), &fileinfo))
 281                 return NULL;
 282
 283         datum = rb_malloc(sizeof(gnutls_datum_t));
 284
 285         if(fileinfo.st_size > 131072) /* deal with retards */
 286                 datum->size = 131072;
 287         else
 288                 datum->size = fileinfo.st_size;
 289
 290         datum->data = rb_malloc(datum->size + 1);
 291         fread(datum->data, datum->size, 1, f);
 292         fclose(f);
 293         return datum;
 294 }
 295
 296 int
 297 rb_setup_ssl_server(const char *cert, const char *keyfile, const char *dhfile)
 298 {
 299         int ret;
 300         gnutls_datum_t *d_cert, *d_key;
 301         if(cert == NULL)
 302         {
 303                 rb_lib_log("rb_setup_ssl_server: No certificate file");
 304                 return 0;
 305         }
 306
 307         if((d_cert = rb_load_file_into_datum_t(cert)) == NULL)
 308         {
 309                 rb_lib_log("rb_setup_ssl_server: Error loading certificate: %s", strerror(errno));
 310                 return 0;
 311         }
 312
 313         if((d_key = rb_load_file_into_datum_t(keyfile)) == NULL)
 314         {
 315                 rb_lib_log("rb_setup_ssl_server: Error loading key: %s", strerror(errno));
 316                 return 0;
 317         }
 318
 319
 320         if((ret = gnutls_certificate_set_x509_key_mem(x509, d_cert, d_key, GNUTLS_X509_FMT_PEM)) != GNUTLS_E_SUCCESS)
 321         {
 322                 rb_lib_log("rb_setup_ssl_server: Error loading certificate or key file: %s", gnutls_strerror(ret));
 323                 return 0;
 324         }
 325         rb_free_datum_t(d_cert);
 326         rb_free_datum_t(d_key);
 327
 328         if(dhfile != NULL)
 329         {
 330                 if(gnutls_dh_params_init(&dh_params) == GNUTLS_E_SUCCESS)
 331                 {
 332                         gnutls_datum_t *data;
 333                         int xret;
 334                         data = rb_load_file_into_datum_t(dhfile);
 335                         if(data != NULL)
 336                         {
 337                                 xret = gnutls_dh_params_import_pkcs3(dh_params, data, GNUTLS_X509_FMT_PEM);
 338                                 if(xret < 0)
 339                                         rb_lib_log("rb_setup_ssl_server: Error parsing DH file: %s\n", gnutls_strerror(xret));
 340                                 rb_free_datum_t(data);
 341                         }
 342                         gnutls_certificate_set_dh_params(x509, dh_params);
 343                 } else
 344                         rb_lib_log("rb_setup_ssl_server: Unable to setup DH parameters");
 345         }
 346         return 1;
 347 }
 348
 349 int
 350 rb_ssl_listen(rb_fde_t * F, int backlog)
 351 {
 352         F->type = RB_FD_SOCKET | RB_FD_LISTEN | RB_FD_SSL;
 353         return listen(F->fd, backlog);
 354 }
 355
 356 struct ssl_connect
 357 {
 358         CNCB *callback;
 359         void *data;
 360         int timeout;
 361 };
 362
 363 static void
 364 rb_ssl_connect_realcb(rb_fde_t * F, int status, struct ssl_connect *sconn)
 365 {
 366         F->connect->callback = sconn->callback;
 367         F->connect->data = sconn->data;
 368         rb_free(sconn);
 369         rb_connect_callback(F, status);
 370 }
 371
 372 static void
 373 rb_ssl_tryconn_timeout_cb(rb_fde_t * F, void *data)
 374 {
 375         rb_ssl_connect_realcb(F, RB_ERR_TIMEOUT, data);
 376 }
 377
 378 static void
 379 rb_ssl_tryconn_cb(rb_fde_t * F, void *data)
 380 {
 381         struct ssl_connect *sconn = data;
 382         int ret;
 383
 384         ret = do_ssl_handshake(F, rb_ssl_tryconn_cb);
 385
 386         switch(ret)
 387         {
 388                 case -1:
 389                         rb_ssl_connect_realcb(F, RB_ERROR_SSL, sconn);
 390                         break;
 391                 case 0:
 392                         /* do_ssl_handshake does the rb_setselect stuff */
 393                         return;
 394                 default:
 395                         break;
 396
 397
 398         }
 399         rb_ssl_connect_realcb(F, RB_OK, sconn);
 400 }
 401
 402 static void
 403 rb_ssl_tryconn(rb_fde_t * F, int status, void *data)
 404 {
 405         struct ssl_connect *sconn = data;
 406         if(status != RB_OK)
 407         {
 408                 rb_ssl_connect_realcb(F, status, sconn);
 409                 return;
 410         }
 411
 412         F->type |= RB_FD_SSL;
 413
 414
 415         rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn);
 416         F->ssl = rb_malloc(sizeof(gnutls_session_t));
 417         gnutls_init(F->ssl, GNUTLS_CLIENT);
 418         gnutls_set_default_priority(SSL_P(F));
 419         gnutls_dh_set_prime_bits(SSL_P(F), 1024);
 420         gnutls_transport_set_ptr(SSL_P(F), (gnutls_transport_ptr_t) (long int)F->fd);
 421
 422         if(do_ssl_handshake(F, rb_ssl_tryconn_cb))
 423         {
 424                 rb_ssl_connect_realcb(F, RB_OK, sconn);
 425         }
 426 }
 427
 428 void
 429 rb_connect_tcp_ssl(rb_fde_t * F, struct sockaddr *dest,
 430                    struct sockaddr *clocal, int socklen, CNCB * callback, void *data, int timeout)
 431 {
 432         struct ssl_connect *sconn;
 433         if(F == NULL)
 434                 return;
 435
 436         sconn = rb_malloc(sizeof(struct ssl_connect));
 437         sconn->data = data;
 438         sconn->callback = callback;
 439         sconn->timeout = timeout;
 440         rb_connect_tcp(F, dest, clocal, socklen, rb_ssl_tryconn, sconn, timeout);
 441
 442 }
 443
 444 void
 445 rb_ssl_start_connected(rb_fde_t * F, CNCB * callback, void *data, int timeout)
 446 {
 447         struct ssl_connect *sconn;
 448         if(F == NULL)
 449                 return;
 450
 451         sconn = rb_malloc(sizeof(struct ssl_connect));
 452         sconn->data = data;
 453         sconn->callback = callback;
 454         sconn->timeout = timeout;
 455         F->connect = rb_malloc(sizeof(struct conndata));
 456         F->connect->callback = callback;
 457         F->connect->data = data;
 458         F->type |= RB_FD_SSL;
 459         F->ssl = rb_malloc(sizeof(gnutls_session_t));
 460
 461         gnutls_init(F->ssl, GNUTLS_CLIENT);
 462         gnutls_set_default_priority(SSL_P(F));
 463         gnutls_dh_set_prime_bits(SSL_P(F), 1024);
 464         gnutls_transport_set_ptr(SSL_P(F), (gnutls_transport_ptr_t) (long int)F->fd);
 465
 466         rb_settimeout(F, sconn->timeout, rb_ssl_tryconn_timeout_cb, sconn);
 467
 468         if(do_ssl_handshake(F, rb_ssl_tryconn_cb))
 469         {
 470                 rb_ssl_connect_realcb(F, RB_OK, sconn);
 471         }
 472 }
 473
 474 int
 475 rb_init_prng(const char *path, prng_seed_t seed_type)
 476 {
 477         gcry_fast_random_poll();
 478         return 1;
 479 }
 480
 481 int
 482 rb_get_random(void *buf, size_t length)
 483 {
 484         gcry_randomize(buf, length, GCRY_STRONG_RANDOM);
 485         return 1;
 486 }
 487
 488
 489 const char *
 490 rb_get_ssl_strerror(rb_fde_t * F)
 491 {
 492         return gnutls_strerror(F->ssl_errno);
 493 }
 494
 495 int
 496 rb_supports_ssl(void)
 497 {
 498         return 1;
 499 }
 500
 501 #endif /* HAVE_GNUTLS */