1 /* 2 * Copyright (c) 1999-2006, 2008 Proofpoint, Inc. and its suppliers. 3 * All rights reserved. 4 * 5 * By using this file, you agree to the terms and conditions set 6 * forth in the LICENSE file which can be found at the top level of 7 * the sendmail distribution. 8 * 9 */ 10 11 #include <sm/gen.h> 12 SM_RCSID("@(#)$Id: sfsasl.c,v 8.121 2013-11-22 20:51:56 ca Exp $") 13 #include <stdlib.h> 14 #include <sendmail.h> 15 #include <sm/time.h> 16 #include <sm/fdset.h> 17 #include <errno.h> 18 19 /* allow to disable error handling code just in case... */ 20 #ifndef DEAL_WITH_ERROR_SSL 21 # define DEAL_WITH_ERROR_SSL 1 22 #endif /* ! DEAL_WITH_ERROR_SSL */ 23 24 #if SASL 25 # include "sfsasl.h" 26 27 /* Structure used by the "sasl" file type */ 28 struct sasl_obj 29 { 30 SM_FILE_T *fp; 31 sasl_conn_t *conn; 32 }; 33 34 struct sasl_info 35 { 36 SM_FILE_T *fp; 37 sasl_conn_t *conn; 38 }; 39 40 /* 41 ** SASL_GETINFO - returns requested information about a "sasl" file 42 ** descriptor. 43 ** 44 ** Parameters: 45 ** fp -- the file descriptor 46 ** what -- the type of information requested 47 ** valp -- the thang to return the information in 48 ** 49 ** Returns: 50 ** -1 for unknown requests 51 ** >=0 on success with valp filled in (if possible). 52 */ 53 54 static int sasl_getinfo __P((SM_FILE_T *, int, void *)); 55 56 static int 57 sasl_getinfo(fp, what, valp) 58 SM_FILE_T *fp; 59 int what; 60 void *valp; 61 { 62 struct sasl_obj *so = (struct sasl_obj *) fp->f_cookie; 63 64 switch (what) 65 { 66 case SM_IO_WHAT_FD: 67 if (so->fp == NULL) 68 return -1; 69 return so->fp->f_file; /* for stdio fileno() compatability */ 70 71 case SM_IO_IS_READABLE: 72 if (so->fp == NULL) 73 return 0; 74 75 /* get info from underlying file */ 76 return sm_io_getinfo(so->fp, what, valp); 77 78 default: 79 return -1; 80 } 81 } 82 83 /* 84 ** SASL_OPEN -- creates the sasl specific information for opening a 85 ** file of the sasl type. 86 ** 87 ** Parameters: 88 ** fp -- the file pointer associated with the new open 89 ** info -- contains the sasl connection information pointer and 90 ** the original SM_FILE_T that holds the open 91 ** flags -- ignored 92 ** rpool -- ignored 93 ** 94 ** Returns: 95 ** 0 on success 96 */ 97 98 static int sasl_open __P((SM_FILE_T *, const void *, int, const void *)); 99 100 /* ARGSUSED2 */ 101 static int 102 sasl_open(fp, info, flags, rpool) 103 SM_FILE_T *fp; 104 const void *info; 105 int flags; 106 const void *rpool; 107 { 108 struct sasl_obj *so; 109 struct sasl_info *si = (struct sasl_info *) info; 110 111 so = (struct sasl_obj *) sm_malloc(sizeof(struct sasl_obj)); 112 if (so == NULL) 113 { 114 errno = ENOMEM; 115 return -1; 116 } 117 so->fp = si->fp; 118 so->conn = si->conn; 119 120 /* 121 ** The underlying 'fp' is set to SM_IO_NOW so that the entire 122 ** encoded string is written in one chunk. Otherwise there is 123 ** the possibility that it may appear illegal, bogus or 124 ** mangled to the other side of the connection. 125 ** We will read or write through 'fp' since it is the opaque 126 ** connection for the communications. We need to treat it this 127 ** way in case the encoded string is to be sent down a TLS 128 ** connection rather than, say, sm_io's stdio. 129 */ 130 131 (void) sm_io_setvbuf(so->fp, SM_TIME_DEFAULT, NULL, SM_IO_NOW, 0); 132 fp->f_cookie = so; 133 return 0; 134 } 135 136 /* 137 ** SASL_CLOSE -- close the sasl specific parts of the sasl file pointer 138 ** 139 ** Parameters: 140 ** fp -- the file pointer to close 141 ** 142 ** Returns: 143 ** 0 on success 144 */ 145 146 static int sasl_close __P((SM_FILE_T *)); 147 148 static int 149 sasl_close(fp) 150 SM_FILE_T *fp; 151 { 152 struct sasl_obj *so; 153 154 so = (struct sasl_obj *) fp->f_cookie; 155 if (so == NULL) 156 return 0; 157 if (so->fp != NULL) 158 { 159 sm_io_close(so->fp, SM_TIME_DEFAULT); 160 so->fp = NULL; 161 } 162 sm_free(so); 163 so = NULL; 164 return 0; 165 } 166 167 /* how to deallocate a buffer allocated by SASL */ 168 extern void sm_sasl_free __P((void *)); 169 # define SASL_DEALLOC(b) sm_sasl_free(b) 170 171 /* 172 ** SASL_READ -- read encrypted information and decrypt it for the caller 173 ** 174 ** Parameters: 175 ** fp -- the file pointer 176 ** buf -- the location to place the decrypted information 177 ** size -- the number of bytes to read after decryption 178 ** 179 ** Results: 180 ** -1 on error 181 ** otherwise the number of bytes read 182 */ 183 184 static ssize_t sasl_read __P((SM_FILE_T *, char *, size_t)); 185 186 static ssize_t 187 sasl_read(fp, buf, size) 188 SM_FILE_T *fp; 189 char *buf; 190 size_t size; 191 { 192 int result; 193 ssize_t len; 194 # if SASL >= 20000 195 static const char *outbuf = NULL; 196 # else /* SASL >= 20000 */ 197 static char *outbuf = NULL; 198 # endif /* SASL >= 20000 */ 199 static unsigned int outlen = 0; 200 static unsigned int offset = 0; 201 struct sasl_obj *so = (struct sasl_obj *) fp->f_cookie; 202 203 /* 204 ** sasl_decode() may require more data than a single read() returns. 205 ** Hence we have to put a loop around the decoding. 206 ** This also requires that we may have to split up the returned 207 ** data since it might be larger than the allowed size. 208 ** Therefore we use a static pointer and return portions of it 209 ** if necessary. 210 ** XXX Note: This function is not thread-safe nor can it be used 211 ** on more than one file. A correct implementation would store 212 ** this data in fp->f_cookie. 213 */ 214 215 # if SASL >= 20000 216 while (outlen == 0) 217 # else /* SASL >= 20000 */ 218 while (outbuf == NULL && outlen == 0) 219 # endif /* SASL >= 20000 */ 220 { 221 len = sm_io_read(so->fp, SM_TIME_DEFAULT, buf, size); 222 if (len <= 0) 223 return len; 224 result = sasl_decode(so->conn, buf, 225 (unsigned int) len, &outbuf, &outlen); 226 if (result != SASL_OK) 227 { 228 if (LogLevel > 7) 229 sm_syslog(LOG_WARNING, NOQID, 230 "AUTH: sasl_decode error=%d", result); 231 outbuf = NULL; 232 offset = 0; 233 outlen = 0; 234 return -1; 235 } 236 } 237 238 if (outbuf == NULL) 239 { 240 /* be paranoid: outbuf == NULL but outlen != 0 */ 241 syserr("@sasl_read failure: outbuf == NULL but outlen != 0"); 242 /* NOTREACHED */ 243 } 244 if (outlen - offset > size) 245 { 246 /* return another part of the buffer */ 247 (void) memcpy(buf, outbuf + offset, size); 248 offset += size; 249 len = size; 250 } 251 else 252 { 253 /* return the rest of the buffer */ 254 len = outlen - offset; 255 (void) memcpy(buf, outbuf + offset, (size_t) len); 256 # if SASL < 20000 257 SASL_DEALLOC(outbuf); 258 # endif /* SASL < 20000 */ 259 outbuf = NULL; 260 offset = 0; 261 outlen = 0; 262 } 263 return len; 264 } 265 266 /* 267 ** SASL_WRITE -- write information out after encrypting it 268 ** 269 ** Parameters: 270 ** fp -- the file pointer 271 ** buf -- holds the data to be encrypted and written 272 ** size -- the number of bytes to have encrypted and written 273 ** 274 ** Returns: 275 ** -1 on error 276 ** otherwise number of bytes written 277 */ 278 279 static ssize_t sasl_write __P((SM_FILE_T *, const char *, size_t)); 280 281 static ssize_t 282 sasl_write(fp, buf, size) 283 SM_FILE_T *fp; 284 const char *buf; 285 size_t size; 286 { 287 int result; 288 # if SASL >= 20000 289 const char *outbuf; 290 # else /* SASL >= 20000 */ 291 char *outbuf; 292 # endif /* SASL >= 20000 */ 293 unsigned int outlen, *maxencode; 294 size_t ret = 0, total = 0; 295 struct sasl_obj *so = (struct sasl_obj *) fp->f_cookie; 296 297 /* 298 ** Fetch the maximum input buffer size for sasl_encode(). 299 ** This can be less than the size set in attemptauth() 300 ** due to a negotiation with the other side, e.g., 301 ** Cyrus IMAP lmtp program sets maxbuf=4096, 302 ** digestmd5 substracts 25 and hence we'll get 4071 303 ** instead of 8192 (MAXOUTLEN). 304 ** Hack (for now): simply reduce the size, callers are (must be) 305 ** able to deal with that and invoke sasl_write() again with 306 ** the rest of the data. 307 ** Note: it would be better to store this value in the context 308 ** after the negotiation. 309 */ 310 311 result = sasl_getprop(so->conn, SASL_MAXOUTBUF, 312 (const void **) &maxencode); 313 if (result == SASL_OK && size > *maxencode && *maxencode > 0) 314 size = *maxencode; 315 316 result = sasl_encode(so->conn, buf, 317 (unsigned int) size, &outbuf, &outlen); 318 319 if (result != SASL_OK) 320 { 321 if (LogLevel > 7) 322 sm_syslog(LOG_WARNING, NOQID, 323 "AUTH: sasl_encode error=%d", result); 324 return -1; 325 } 326 327 if (outbuf != NULL) 328 { 329 while (outlen > 0) 330 { 331 errno = 0; 332 /* XXX result == 0? */ 333 ret = sm_io_write(so->fp, SM_TIME_DEFAULT, 334 &outbuf[total], outlen); 335 if (ret <= 0) 336 return ret; 337 outlen -= ret; 338 total += ret; 339 } 340 # if SASL < 20000 341 SASL_DEALLOC(outbuf); 342 # endif /* SASL < 20000 */ 343 } 344 return size; 345 } 346 347 /* 348 ** SFDCSASL -- create sasl file type and open in and out file pointers 349 ** for sendmail to read from and write to. 350 ** 351 ** Parameters: 352 ** fin -- the sm_io file encrypted data to be read from 353 ** fout -- the sm_io file encrypted data to be written to 354 ** conn -- the sasl connection pointer 355 ** tmo -- timeout 356 ** 357 ** Returns: 358 ** -1 on error 359 ** 0 on success 360 ** 361 ** Side effects: 362 ** The arguments "fin" and "fout" are replaced with the new 363 ** SM_FILE_T pointers. 364 */ 365 366 int 367 sfdcsasl(fin, fout, conn, tmo) 368 SM_FILE_T **fin; 369 SM_FILE_T **fout; 370 sasl_conn_t *conn; 371 int tmo; 372 { 373 SM_FILE_T *newin, *newout; 374 SM_FILE_T SM_IO_SET_TYPE(sasl_vector, "sasl", sasl_open, sasl_close, 375 sasl_read, sasl_write, NULL, sasl_getinfo, NULL, 376 SM_TIME_DEFAULT); 377 struct sasl_info info; 378 379 if (conn == NULL) 380 { 381 /* no need to do anything */ 382 return 0; 383 } 384 385 SM_IO_INIT_TYPE(sasl_vector, "sasl", sasl_open, sasl_close, 386 sasl_read, sasl_write, NULL, sasl_getinfo, NULL, 387 SM_TIME_DEFAULT); 388 info.fp = *fin; 389 info.conn = conn; 390 newin = sm_io_open(&sasl_vector, SM_TIME_DEFAULT, &info, 391 SM_IO_RDONLY_B, NULL); 392 393 if (newin == NULL) 394 return -1; 395 396 info.fp = *fout; 397 info.conn = conn; 398 newout = sm_io_open(&sasl_vector, SM_TIME_DEFAULT, &info, 399 SM_IO_WRONLY_B, NULL); 400 401 if (newout == NULL) 402 { 403 (void) sm_io_close(newin, SM_TIME_DEFAULT); 404 return -1; 405 } 406 sm_io_automode(newin, newout); 407 408 sm_io_setinfo(*fin, SM_IO_WHAT_TIMEOUT, &tmo); 409 sm_io_setinfo(*fout, SM_IO_WHAT_TIMEOUT, &tmo); 410 411 *fin = newin; 412 *fout = newout; 413 return 0; 414 } 415 #endif /* SASL */ 416 417 #if STARTTLS 418 # include "sfsasl.h" 419 # include <openssl/err.h> 420 421 /* Structure used by the "tls" file type */ 422 struct tls_obj 423 { 424 SM_FILE_T *fp; 425 SSL *con; 426 }; 427 428 struct tls_info 429 { 430 SM_FILE_T *fp; 431 SSL *con; 432 }; 433 434 /* 435 ** TLS_GETINFO - returns requested information about a "tls" file 436 ** descriptor. 437 ** 438 ** Parameters: 439 ** fp -- the file descriptor 440 ** what -- the type of information requested 441 ** valp -- the thang to return the information in (unused) 442 ** 443 ** Returns: 444 ** -1 for unknown requests 445 ** >=0 on success with valp filled in (if possible). 446 */ 447 448 static int tls_getinfo __P((SM_FILE_T *, int, void *)); 449 450 /* ARGSUSED2 */ 451 static int 452 tls_getinfo(fp, what, valp) 453 SM_FILE_T *fp; 454 int what; 455 void *valp; 456 { 457 struct tls_obj *so = (struct tls_obj *) fp->f_cookie; 458 459 switch (what) 460 { 461 case SM_IO_WHAT_FD: 462 if (so->fp == NULL) 463 return -1; 464 return so->fp->f_file; /* for stdio fileno() compatability */ 465 466 case SM_IO_IS_READABLE: 467 return SSL_pending(so->con) > 0; 468 469 default: 470 return -1; 471 } 472 } 473 474 /* 475 ** TLS_OPEN -- creates the tls specific information for opening a 476 ** file of the tls type. 477 ** 478 ** Parameters: 479 ** fp -- the file pointer associated with the new open 480 ** info -- the sm_io file pointer holding the open and the 481 ** TLS encryption connection to be read from or written to 482 ** flags -- ignored 483 ** rpool -- ignored 484 ** 485 ** Returns: 486 ** 0 on success 487 */ 488 489 static int tls_open __P((SM_FILE_T *, const void *, int, const void *)); 490 491 /* ARGSUSED2 */ 492 static int 493 tls_open(fp, info, flags, rpool) 494 SM_FILE_T *fp; 495 const void *info; 496 int flags; 497 const void *rpool; 498 { 499 struct tls_obj *so; 500 struct tls_info *ti = (struct tls_info *) info; 501 502 so = (struct tls_obj *) sm_malloc(sizeof(struct tls_obj)); 503 if (so == NULL) 504 { 505 errno = ENOMEM; 506 return -1; 507 } 508 so->fp = ti->fp; 509 so->con = ti->con; 510 511 /* 512 ** We try to get the "raw" file descriptor that TLS uses to 513 ** do the actual read/write with. This is to allow us control 514 ** over the file descriptor being a blocking or non-blocking type. 515 ** Under the covers TLS handles the change and this allows us 516 ** to do timeouts with sm_io. 517 */ 518 519 fp->f_file = sm_io_getinfo(so->fp, SM_IO_WHAT_FD, NULL); 520 (void) sm_io_setvbuf(so->fp, SM_TIME_DEFAULT, NULL, SM_IO_NOW, 0); 521 fp->f_cookie = so; 522 return 0; 523 } 524 525 /* 526 ** TLS_CLOSE -- close the tls specific parts of the tls file pointer 527 ** 528 ** Parameters: 529 ** fp -- the file pointer to close 530 ** 531 ** Returns: 532 ** 0 on success 533 */ 534 535 static int tls_close __P((SM_FILE_T *)); 536 537 static int 538 tls_close(fp) 539 SM_FILE_T *fp; 540 { 541 struct tls_obj *so; 542 543 so = (struct tls_obj *) fp->f_cookie; 544 if (so == NULL) 545 return 0; 546 if (so->fp != NULL) 547 { 548 sm_io_close(so->fp, SM_TIME_DEFAULT); 549 so->fp = NULL; 550 } 551 sm_free(so); 552 so = NULL; 553 return 0; 554 } 555 556 /* maximum number of retries for TLS related I/O due to handshakes */ 557 # define MAX_TLS_IOS 4 558 559 /* 560 ** TLS_RETRY -- check whether a failed SSL operation can be retried 561 ** 562 ** Parameters: 563 ** ssl -- TLS structure 564 ** rfd -- read fd 565 ** wfd -- write fd 566 ** tlsstart -- start time of TLS operation 567 ** timeout -- timeout for TLS operation 568 ** err -- SSL error 569 ** where -- description of operation 570 ** 571 ** Results: 572 ** >0 on success 573 ** 0 on timeout 574 ** <0 on error 575 */ 576 577 int 578 tls_retry(ssl, rfd, wfd, tlsstart, timeout, err, where) 579 SSL *ssl; 580 int rfd; 581 int wfd; 582 time_t tlsstart; 583 int timeout; 584 int err; 585 const char *where; 586 { 587 int ret; 588 time_t left; 589 time_t now = curtime(); 590 struct timeval tv; 591 592 ret = -1; 593 594 /* 595 ** For SSL_ERROR_WANT_{READ,WRITE}: 596 ** There is not a complete SSL record available yet 597 ** or there is only a partial SSL record removed from 598 ** the network (socket) buffer into the SSL buffer. 599 ** The SSL_connect will only succeed when a full 600 ** SSL record is available (assuming a "real" error 601 ** doesn't happen). To handle when a "real" error 602 ** does happen the select is set for exceptions too. 603 ** The connection may be re-negotiated during this time 604 ** so both read and write "want errors" need to be handled. 605 ** A select() exception loops back so that a proper SSL 606 ** error message can be gotten. 607 */ 608 609 left = timeout - (now - tlsstart); 610 if (left <= 0) 611 return 0; /* timeout */ 612 tv.tv_sec = left; 613 tv.tv_usec = 0; 614 615 if (LogLevel > 14) 616 { 617 sm_syslog(LOG_INFO, NOQID, 618 "STARTTLS=%s, info: fds=%d/%d, err=%d", 619 where, rfd, wfd, err); 620 } 621 622 if ((err == SSL_ERROR_WANT_READ && !SM_FD_OK_SELECT(rfd)) || 623 (err == SSL_ERROR_WANT_WRITE && !SM_FD_OK_SELECT(wfd))) 624 { 625 if (LogLevel > 5) 626 { 627 sm_syslog(LOG_ERR, NOQID, 628 "STARTTLS=%s, error: fd %d/%d too large", 629 where, rfd, wfd); 630 if (LogLevel > 8) 631 tlslogerr(LOG_WARNING, where); 632 } 633 errno = EINVAL; 634 } 635 else if (err == SSL_ERROR_WANT_READ) 636 { 637 fd_set ssl_maskr, ssl_maskx; 638 int save_errno = errno; 639 640 FD_ZERO(&ssl_maskr); 641 FD_SET(rfd, &ssl_maskr); 642 FD_ZERO(&ssl_maskx); 643 FD_SET(rfd, &ssl_maskx); 644 do 645 { 646 ret = select(rfd + 1, &ssl_maskr, NULL, &ssl_maskx, 647 &tv); 648 } while (ret < 0 && errno == EINTR); 649 if (ret < 0 && errno > 0) 650 ret = -errno; 651 errno = save_errno; 652 } 653 else if (err == SSL_ERROR_WANT_WRITE) 654 { 655 fd_set ssl_maskw, ssl_maskx; 656 int save_errno = errno; 657 658 FD_ZERO(&ssl_maskw); 659 FD_SET(wfd, &ssl_maskw); 660 FD_ZERO(&ssl_maskx); 661 FD_SET(rfd, &ssl_maskx); 662 do 663 { 664 ret = select(wfd + 1, NULL, &ssl_maskw, &ssl_maskx, 665 &tv); 666 } while (ret < 0 && errno == EINTR); 667 if (ret < 0 && errno > 0) 668 ret = -errno; 669 errno = save_errno; 670 } 671 return ret; 672 } 673 674 /* errno to force refill() etc to stop (see IS_IO_ERROR()) */ 675 #ifdef ETIMEDOUT 676 # define SM_ERR_TIMEOUT ETIMEDOUT 677 #else /* ETIMEDOUT */ 678 # define SM_ERR_TIMEOUT EIO 679 #endif /* ETIMEDOUT */ 680 681 /* 682 ** SET_TLS_RD_TMO -- read secured information for the caller 683 ** 684 ** Parameters: 685 ** rd_tmo -- read timeout 686 ** 687 ** Results: 688 ** previous read timeout 689 ** This is a hack: there is no way to pass it in 690 */ 691 692 static int tls_rd_tmo = -1; 693 694 int 695 set_tls_rd_tmo(rd_tmo) 696 int rd_tmo; 697 { 698 int old_rd_tmo; 699 700 old_rd_tmo = tls_rd_tmo; 701 tls_rd_tmo = rd_tmo; 702 return old_rd_tmo; 703 } 704 705 /* 706 ** TLS_READ -- read secured information for the caller 707 ** 708 ** Parameters: 709 ** fp -- the file pointer 710 ** buf -- the location to place the data 711 ** size -- the number of bytes to read from connection 712 ** 713 ** Results: 714 ** -1 on error 715 ** otherwise the number of bytes read 716 */ 717 718 static ssize_t tls_read __P((SM_FILE_T *, char *, size_t)); 719 720 static ssize_t 721 tls_read(fp, buf, size) 722 SM_FILE_T *fp; 723 char *buf; 724 size_t size; 725 { 726 int r, rfd, wfd, try, ssl_err; 727 struct tls_obj *so = (struct tls_obj *) fp->f_cookie; 728 time_t tlsstart; 729 char *err; 730 731 try = 99; 732 err = NULL; 733 tlsstart = curtime(); 734 735 retry: 736 r = SSL_read(so->con, (char *) buf, size); 737 738 if (r > 0) 739 return r; 740 741 err = NULL; 742 switch (ssl_err = SSL_get_error(so->con, r)) 743 { 744 case SSL_ERROR_NONE: 745 case SSL_ERROR_ZERO_RETURN: 746 break; 747 case SSL_ERROR_WANT_WRITE: 748 err = "read W BLOCK"; 749 /* FALLTHROUGH */ 750 case SSL_ERROR_WANT_READ: 751 if (err == NULL) 752 err = "read R BLOCK"; 753 rfd = SSL_get_rfd(so->con); 754 wfd = SSL_get_wfd(so->con); 755 try = tls_retry(so->con, rfd, wfd, tlsstart, 756 (tls_rd_tmo < 0) ? TimeOuts.to_datablock 757 : tls_rd_tmo, 758 ssl_err, "read"); 759 if (try > 0) 760 goto retry; 761 errno = SM_ERR_TIMEOUT; 762 break; 763 764 case SSL_ERROR_WANT_X509_LOOKUP: 765 err = "write X BLOCK"; 766 break; 767 case SSL_ERROR_SYSCALL: 768 if (r == 0 && errno == 0) /* out of protocol EOF found */ 769 break; 770 err = "syscall error"; 771 /* 772 get_last_socket_error()); 773 */ 774 break; 775 case SSL_ERROR_SSL: 776 #if DEAL_WITH_ERROR_SSL 777 if (r == 0 && errno == 0) /* out of protocol EOF found */ 778 break; 779 #endif /* DEAL_WITH_ERROR_SSL */ 780 err = "generic SSL error"; 781 782 if (LogLevel > 9) 783 { 784 int pri; 785 786 if (errno == EAGAIN && try > 0) 787 pri = LOG_DEBUG; 788 else 789 pri = LOG_WARNING; 790 tlslogerr(pri, "read"); 791 } 792 793 #if DEAL_WITH_ERROR_SSL 794 /* avoid repeated calls? */ 795 if (r == 0) 796 r = -1; 797 #endif /* DEAL_WITH_ERROR_SSL */ 798 break; 799 } 800 if (err != NULL) 801 { 802 int save_errno; 803 804 save_errno = (errno == 0) ? EIO : errno; 805 if (try == 0 && save_errno == SM_ERR_TIMEOUT) 806 { 807 if (LogLevel > 7) 808 sm_syslog(LOG_WARNING, NOQID, 809 "STARTTLS: read error=timeout"); 810 } 811 else if (LogLevel > 8) 812 { 813 int pri; 814 815 if (save_errno == EAGAIN && try > 0) 816 pri = LOG_DEBUG; 817 else 818 pri = LOG_WARNING; 819 sm_syslog(pri, NOQID, 820 "STARTTLS: read error=%s (%d), errno=%d, get_error=%s, retry=%d, ssl_err=%d", 821 err, r, errno, 822 ERR_error_string(ERR_get_error(), NULL), try, 823 ssl_err); 824 } 825 else if (LogLevel > 7) 826 sm_syslog(LOG_WARNING, NOQID, 827 "STARTTLS: read error=%s (%d), errno=%d, retry=%d, ssl_err=%d", 828 err, r, errno, try, ssl_err); 829 errno = save_errno; 830 } 831 return r; 832 } 833 834 /* 835 ** TLS_WRITE -- write information out through secure connection 836 ** 837 ** Parameters: 838 ** fp -- the file pointer 839 ** buf -- holds the data to be securely written 840 ** size -- the number of bytes to write 841 ** 842 ** Returns: 843 ** -1 on error 844 ** otherwise number of bytes written 845 */ 846 847 static ssize_t tls_write __P((SM_FILE_T *, const char *, size_t)); 848 849 static ssize_t 850 tls_write(fp, buf, size) 851 SM_FILE_T *fp; 852 const char *buf; 853 size_t size; 854 { 855 int r, rfd, wfd, try, ssl_err; 856 struct tls_obj *so = (struct tls_obj *) fp->f_cookie; 857 time_t tlsstart; 858 char *err; 859 860 try = 99; 861 err = NULL; 862 tlsstart = curtime(); 863 864 retry: 865 r = SSL_write(so->con, (char *) buf, size); 866 867 if (r > 0) 868 return r; 869 err = NULL; 870 switch (ssl_err = SSL_get_error(so->con, r)) 871 { 872 case SSL_ERROR_NONE: 873 case SSL_ERROR_ZERO_RETURN: 874 break; 875 case SSL_ERROR_WANT_WRITE: 876 err = "read W BLOCK"; 877 /* FALLTHROUGH */ 878 case SSL_ERROR_WANT_READ: 879 if (err == NULL) 880 err = "read R BLOCK"; 881 rfd = SSL_get_rfd(so->con); 882 wfd = SSL_get_wfd(so->con); 883 try = tls_retry(so->con, rfd, wfd, tlsstart, 884 DATA_PROGRESS_TIMEOUT, ssl_err, "write"); 885 if (try > 0) 886 goto retry; 887 errno = SM_ERR_TIMEOUT; 888 break; 889 case SSL_ERROR_WANT_X509_LOOKUP: 890 err = "write X BLOCK"; 891 break; 892 case SSL_ERROR_SYSCALL: 893 if (r == 0 && errno == 0) /* out of protocol EOF found */ 894 break; 895 err = "syscall error"; 896 /* 897 get_last_socket_error()); 898 */ 899 break; 900 case SSL_ERROR_SSL: 901 err = "generic SSL error"; 902 /* 903 ERR_GET_REASON(ERR_peek_error())); 904 */ 905 if (LogLevel > 9) 906 tlslogerr(LOG_WARNING, "write"); 907 908 #if DEAL_WITH_ERROR_SSL 909 /* avoid repeated calls? */ 910 if (r == 0) 911 r = -1; 912 #endif /* DEAL_WITH_ERROR_SSL */ 913 break; 914 } 915 if (err != NULL) 916 { 917 int save_errno; 918 919 save_errno = (errno == 0) ? EIO : errno; 920 if (try == 0 && save_errno == SM_ERR_TIMEOUT) 921 { 922 if (LogLevel > 7) 923 sm_syslog(LOG_WARNING, NOQID, 924 "STARTTLS: write error=timeout"); 925 } 926 else if (LogLevel > 8) 927 sm_syslog(LOG_WARNING, NOQID, 928 "STARTTLS: write error=%s (%d), errno=%d, get_error=%s, retry=%d, ssl_err=%d", 929 err, r, errno, 930 ERR_error_string(ERR_get_error(), NULL), try, 931 ssl_err); 932 else if (LogLevel > 7) 933 sm_syslog(LOG_WARNING, NOQID, 934 "STARTTLS: write error=%s (%d), errno=%d, retry=%d, ssl_err=%d", 935 err, r, errno, try, ssl_err); 936 errno = save_errno; 937 } 938 return r; 939 } 940 941 /* 942 ** SFDCTLS -- create tls file type and open in and out file pointers 943 ** for sendmail to read from and write to. 944 ** 945 ** Parameters: 946 ** fin -- data input source being replaced 947 ** fout -- data output source being replaced 948 ** con -- the tls connection pointer 949 ** 950 ** Returns: 951 ** -1 on error 952 ** 0 on success 953 ** 954 ** Side effects: 955 ** The arguments "fin" and "fout" are replaced with the new 956 ** SM_FILE_T pointers. 957 ** The original "fin" and "fout" are preserved in the tls file 958 ** type but are not actually used because of the design of TLS. 959 */ 960 961 int 962 sfdctls(fin, fout, con) 963 SM_FILE_T **fin; 964 SM_FILE_T **fout; 965 SSL *con; 966 { 967 SM_FILE_T *tlsin, *tlsout; 968 SM_FILE_T SM_IO_SET_TYPE(tls_vector, "tls", tls_open, tls_close, 969 tls_read, tls_write, NULL, tls_getinfo, NULL, 970 SM_TIME_FOREVER); 971 struct tls_info info; 972 973 SM_ASSERT(con != NULL); 974 975 SM_IO_INIT_TYPE(tls_vector, "tls", tls_open, tls_close, 976 tls_read, tls_write, NULL, tls_getinfo, NULL, 977 SM_TIME_FOREVER); 978 info.fp = *fin; 979 info.con = con; 980 tlsin = sm_io_open(&tls_vector, SM_TIME_DEFAULT, &info, SM_IO_RDONLY_B, 981 NULL); 982 if (tlsin == NULL) 983 return -1; 984 985 info.fp = *fout; 986 tlsout = sm_io_open(&tls_vector, SM_TIME_DEFAULT, &info, SM_IO_WRONLY_B, 987 NULL); 988 if (tlsout == NULL) 989 { 990 (void) sm_io_close(tlsin, SM_TIME_DEFAULT); 991 return -1; 992 } 993 sm_io_automode(tlsin, tlsout); 994 995 *fin = tlsin; 996 *fout = tlsout; 997 return 0; 998 } 999 #endif /* STARTTLS */ 1000