1 /*- 2 * Copyright (c) 2009 The NetBSD Foundation, Inc. 3 * All rights reserved. 4 * 5 * This code is derived from software contributed to The NetBSD Foundation 6 * by Alistair Crooks (agc@NetBSD.org) 7 * 8 * Redistribution and use in source and binary forms, with or without 9 * modification, are permitted provided that the following conditions 10 * are met: 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in the 15 * documentation and/or other materials provided with the distribution. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 18 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 19 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 20 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 21 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 22 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 23 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 24 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 25 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 26 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 27 * POSSIBILITY OF SUCH DAMAGE. 28 */ 29 /* 30 * Copyright (c) 2005-2008 Nominet UK (www.nic.uk) 31 * All rights reserved. 32 * Contributors: Ben Laurie, Rachel Willmer. The Contributors have asserted 33 * their moral rights under the UK Copyright Design and Patents Act 1988 to 34 * be recorded as the authors of this copyright work. 35 * 36 * Licensed under the Apache License, Version 2.0 (the "License"); you may not 37 * use this file except in compliance with the License. 38 * 39 * You may obtain a copy of the License at 40 * http://www.apache.org/licenses/LICENSE-2.0 41 * 42 * Unless required by applicable law or agreed to in writing, software 43 * distributed under the License is distributed on an "AS IS" BASIS, 44 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 45 * 46 * See the License for the specific language governing permissions and 47 * limitations under the License. 48 */ 49 50 /** \file 51 * \brief Parser for OpenPGP packets 52 */ 53 #include "config.h" 54 55 #ifdef HAVE_SYS_CDEFS_H 56 #include <sys/cdefs.h> 57 #endif 58 59 #if defined(__NetBSD__) 60 __COPYRIGHT("@(#) Copyright (c) 2009 The NetBSD Foundation, Inc. All rights reserved."); 61 __RCSID("$NetBSD: packet-parse.c,v 1.29 2010/02/06 10:50:52 dsl Exp $"); 62 #endif 63 64 #ifdef HAVE_OPENSSL_CAST_H 65 #include <openssl/cast.h> 66 #endif 67 68 #include <stdarg.h> 69 #include <stdlib.h> 70 #include <string.h> 71 72 #ifdef HAVE_UNISTD_H 73 #include <unistd.h> 74 #endif 75 76 #ifdef HAVE_LIMITS_H 77 #include <limits.h> 78 #endif 79 80 #include "packet.h" 81 #include "packet-parse.h" 82 #include "keyring.h" 83 #include "errors.h" 84 #include "packet-show.h" 85 #include "create.h" 86 #include "readerwriter.h" 87 #include "netpgpdefs.h" 88 #include "crypto.h" 89 #include "netpgpdigest.h" 90 91 #define ERRP(cbinfo, cont, err) do { \ 92 cont.u.error.error = err; \ 93 CALLBACK(OPS_PARSER_ERROR, cbinfo, &cont); \ 94 return 0; \ 95 /*NOTREACHED*/ \ 96 } while(/*CONSTCOND*/0) 97 98 /** 99 * limread_data reads the specified amount of the subregion's data 100 * into a data_t structure 101 * 102 * \param data Empty structure which will be filled with data 103 * \param len Number of octets to read 104 * \param subregion 105 * \param stream How to parse 106 * 107 * \return 1 on success, 0 on failure 108 */ 109 static int 110 limread_data(__ops_data_t *data, unsigned int len, 111 __ops_region_t *subregion, __ops_stream_t *stream) 112 { 113 data->len = len; 114 115 if (subregion->length - subregion->readc < len) { 116 (void) fprintf(stderr, "limread_data: bad length\n"); 117 return 0; 118 } 119 120 data->contents = calloc(1, data->len); 121 if (!data->contents) { 122 return 0; 123 } 124 125 return __ops_limited_read(data->contents, data->len, subregion, 126 &stream->errors, &stream->readinfo, &stream->cbinfo); 127 } 128 129 /** 130 * read_data reads the remainder of the subregion's data 131 * into a data_t structure 132 * 133 * \param data 134 * \param subregion 135 * \param stream 136 * 137 * \return 1 on success, 0 on failure 138 */ 139 static int 140 read_data(__ops_data_t *data, __ops_region_t *region, __ops_stream_t *stream) 141 { 142 int cc; 143 144 cc = region->length - region->readc; 145 return (cc >= 0) ? limread_data(data, (unsigned)cc, region, stream) : 0; 146 } 147 148 /** 149 * Reads the remainder of the subregion as a string. 150 * It is the user's responsibility to free the memory allocated here. 151 */ 152 153 static int 154 read_unsig_str(unsigned char **str, __ops_region_t *subregion, 155 __ops_stream_t *stream) 156 { 157 size_t len; 158 159 len = subregion->length - subregion->readc; 160 if ((*str = calloc(1, len + 1)) == NULL) { 161 return 0; 162 } 163 if (len && 164 !__ops_limited_read(*str, len, subregion, &stream->errors, 165 &stream->readinfo, &stream->cbinfo)) { 166 return 0; 167 } 168 (*str)[len] = '\0'; 169 return 1; 170 } 171 172 static int 173 read_string(char **str, __ops_region_t *subregion, __ops_stream_t *stream) 174 { 175 return read_unsig_str((unsigned char **) str, subregion, stream); 176 } 177 178 void 179 __ops_init_subregion(__ops_region_t *subregion, __ops_region_t *region) 180 { 181 (void) memset(subregion, 0x0, sizeof(*subregion)); 182 subregion->parent = region; 183 } 184 185 /* 186 * XXX: replace __ops_ptag_t with something more appropriate for limiting reads 187 */ 188 189 /** 190 * low-level function to read data from reader function 191 * 192 * Use this function, rather than calling the reader directly. 193 * 194 * If the accumulate flag is set in *stream, the function 195 * adds the read data to the accumulated data, and updates 196 * the accumulated length. This is useful if, for example, 197 * the application wants access to the raw data as well as the 198 * parsed data. 199 * 200 * This function will also try to read the entire amount asked for, but not 201 * if it is over INT_MAX. Obviously many callers will know that they 202 * never ask for that much and so can avoid the extra complexity of 203 * dealing with return codes and filled-in lengths. 204 * 205 * \param *dest 206 * \param *plength 207 * \param flags 208 * \param *stream 209 * 210 * \return OPS_R_OK 211 * \return OPS_R_PARTIAL_READ 212 * \return OPS_R_EOF 213 * \return OPS_R_EARLY_EOF 214 * 215 * \sa #__ops_reader_ret_t for details of return codes 216 */ 217 218 static int 219 sub_base_read(void *dest, size_t length, __ops_error_t **errors, 220 __ops_reader_t *readinfo, __ops_cbdata_t *cbinfo) 221 { 222 size_t n; 223 224 /* reading more than this would look like an error */ 225 if (length > INT_MAX) 226 length = INT_MAX; 227 228 for (n = 0; n < length;) { 229 int r; 230 231 r = readinfo->reader((char *) dest + n, length - n, errors, 232 readinfo, cbinfo); 233 if (r > (int)(length - n)) { 234 (void) fprintf(stderr, "sub_base_read: bad read\n"); 235 return 0; 236 } 237 if (r < 0) { 238 return r; 239 } 240 if (r == 0) { 241 break; 242 } 243 n += (unsigned)r; 244 } 245 246 if (n == 0) { 247 return 0; 248 } 249 if (readinfo->accumulate) { 250 if (readinfo->asize < readinfo->alength) { 251 (void) fprintf(stderr, "sub_base_read: bad size\n"); 252 return 0; 253 } 254 if (readinfo->alength + n > readinfo->asize) { 255 unsigned char *temp; 256 257 readinfo->asize = (readinfo->asize * 2) + n; 258 temp = realloc(readinfo->accumulated, readinfo->asize); 259 if (temp == NULL) { 260 (void) fprintf(stderr, 261 "sub_base_read: bad alloc\n"); 262 return 0; 263 } 264 readinfo->accumulated = temp; 265 } 266 if (readinfo->asize < readinfo->alength + n) { 267 (void) fprintf(stderr, "sub_base_read: bad realloc\n"); 268 return 0; 269 } 270 (void) memcpy(readinfo->accumulated + readinfo->alength, dest, 271 n); 272 } 273 /* we track length anyway, because it is used for packet offsets */ 274 readinfo->alength += n; 275 /* and also the position */ 276 readinfo->position += n; 277 278 return n; 279 } 280 281 int 282 __ops_stacked_read(void *dest, size_t length, __ops_error_t **errors, 283 __ops_reader_t *readinfo, __ops_cbdata_t *cbinfo) 284 { 285 return sub_base_read(dest, length, errors, readinfo->next, cbinfo); 286 } 287 288 /* This will do a full read so long as length < MAX_INT */ 289 static int 290 base_read(unsigned char *dest, size_t length, 291 __ops_stream_t *stream) 292 { 293 return sub_base_read(dest, length, &stream->errors, &stream->readinfo, 294 &stream->cbinfo); 295 } 296 297 /* 298 * Read a full size_t's worth. If the return is < than length, then 299 * *last_read tells you why - < 0 for an error, == 0 for EOF 300 */ 301 302 static size_t 303 full_read(unsigned char *dest, 304 size_t length, 305 int *last_read, 306 __ops_error_t **errors, 307 __ops_reader_t *readinfo, 308 __ops_cbdata_t *cbinfo) 309 { 310 size_t t; 311 int r = 0; /* preset in case some loon calls with length 312 * == 0 */ 313 314 for (t = 0; t < length;) { 315 r = sub_base_read(dest + t, length - t, errors, readinfo, 316 cbinfo); 317 if (r <= 0) { 318 *last_read = r; 319 return t; 320 } 321 t += (size_t)r; 322 } 323 324 *last_read = r; 325 326 return t; 327 } 328 329 330 331 /** Read a scalar value of selected length from reader. 332 * 333 * Read an unsigned scalar value from reader in Big Endian representation. 334 * 335 * This function does not know or care about packet boundaries. It 336 * also assumes that an EOF is an error. 337 * 338 * \param *result The scalar value is stored here 339 * \param *reader Our reader 340 * \param length How many bytes to read 341 * \return 1 on success, 0 on failure 342 */ 343 static unsigned 344 _read_scalar(unsigned *result, unsigned length, 345 __ops_stream_t *stream) 346 { 347 unsigned t = 0; 348 349 if (length > sizeof(*result)) { 350 (void) fprintf(stderr, "_read_scalar: bad length\n"); 351 return 0; 352 } 353 354 while (length--) { 355 unsigned char c; 356 int r; 357 358 r = base_read(&c, 1, stream); 359 if (r != 1) 360 return 0; 361 t = (t << 8) + c; 362 } 363 364 *result = t; 365 return 1; 366 } 367 368 /** 369 * \ingroup Core_ReadPackets 370 * \brief Read bytes from a region within the packet. 371 * 372 * Read length bytes into the buffer pointed to by *dest. 373 * Make sure we do not read over the packet boundary. 374 * Updates the Packet Tag's __ops_ptag_t::readc. 375 * 376 * If length would make us read over the packet boundary, or if 377 * reading fails, we call the callback with an error. 378 * 379 * Note that if the region is indeterminate, this can return a short 380 * read - check region->last_read for the length. EOF is indicated by 381 * a success return and region->last_read == 0 in this case (for a 382 * region of known length, EOF is an error). 383 * 384 * This function makes sure to respect packet boundaries. 385 * 386 * \param dest The destination buffer 387 * \param length How many bytes to read 388 * \param region Pointer to packet region 389 * \param errors Error stack 390 * \param readinfo Reader info 391 * \param cbinfo Callback info 392 * \return 1 on success, 0 on error 393 */ 394 unsigned 395 __ops_limited_read(unsigned char *dest, 396 size_t length, 397 __ops_region_t *region, 398 __ops_error_t **errors, 399 __ops_reader_t *readinfo, 400 __ops_cbdata_t *cbinfo) 401 { 402 size_t r; 403 int lr; 404 405 if (!region->indeterminate && 406 region->readc + length > region->length) { 407 OPS_ERROR(errors, OPS_E_P_NOT_ENOUGH_DATA, "Not enough data"); 408 return 0; 409 } 410 r = full_read(dest, length, &lr, errors, readinfo, cbinfo); 411 if (lr < 0) { 412 OPS_ERROR(errors, OPS_E_R_READ_FAILED, "Read failed"); 413 return 0; 414 } 415 if (!region->indeterminate && r != length) { 416 OPS_ERROR(errors, OPS_E_R_READ_FAILED, "Read failed"); 417 return 0; 418 } 419 region->last_read = r; 420 do { 421 region->readc += r; 422 if (region->parent && region->length > region->parent->length) { 423 (void) fprintf(stderr, 424 "ops_limited_read: bad length\n"); 425 return 0; 426 } 427 } while ((region = region->parent) != NULL); 428 return 1; 429 } 430 431 /** 432 \ingroup Core_ReadPackets 433 \brief Call __ops_limited_read on next in stack 434 */ 435 unsigned 436 __ops_stacked_limited_read(unsigned char *dest, unsigned length, 437 __ops_region_t *region, 438 __ops_error_t **errors, 439 __ops_reader_t *readinfo, 440 __ops_cbdata_t *cbinfo) 441 { 442 return __ops_limited_read(dest, length, region, errors, 443 readinfo->next, cbinfo); 444 } 445 446 static unsigned 447 limread(unsigned char *dest, unsigned length, 448 __ops_region_t *region, __ops_stream_t *info) 449 { 450 return __ops_limited_read(dest, length, region, &info->errors, 451 &info->readinfo, &info->cbinfo); 452 } 453 454 static unsigned 455 exact_limread(unsigned char *dest, unsigned len, 456 __ops_region_t *region, 457 __ops_stream_t *stream) 458 { 459 unsigned ret; 460 461 stream->exact_read = 1; 462 ret = limread(dest, len, region, stream); 463 stream->exact_read = 0; 464 return ret; 465 } 466 467 /** Skip over length bytes of this packet. 468 * 469 * Calls limread() to skip over some data. 470 * 471 * This function makes sure to respect packet boundaries. 472 * 473 * \param length How many bytes to skip 474 * \param *region Pointer to packet region 475 * \param *stream How to parse 476 * \return 1 on success, 0 on error (calls the cb with OPS_PARSER_ERROR in limread()). 477 */ 478 static int 479 limskip(unsigned length, __ops_region_t *region, __ops_stream_t *stream) 480 { 481 unsigned char buf[NETPGP_BUFSIZ]; 482 483 while (length > 0) { 484 unsigned n = length % NETPGP_BUFSIZ; 485 486 if (!limread(buf, n, region, stream)) { 487 return 0; 488 } 489 length -= n; 490 } 491 return 1; 492 } 493 494 /** Read a scalar. 495 * 496 * Read a big-endian scalar of length bytes, respecting packet 497 * boundaries (by calling limread() to read the raw data). 498 * 499 * This function makes sure to respect packet boundaries. 500 * 501 * \param *dest The scalar value is stored here 502 * \param length How many bytes make up this scalar (at most 4) 503 * \param *region Pointer to current packet region 504 * \param *stream How to parse 505 * \param *cb The callback 506 * \return 1 on success, 0 on error (calls the cb with OPS_PARSER_ERROR in limread()). 507 * 508 * \see RFC4880 3.1 509 */ 510 static int 511 limread_scalar(unsigned *dest, 512 unsigned len, 513 __ops_region_t *region, 514 __ops_stream_t *stream) 515 { 516 unsigned char c[4] = ""; 517 unsigned t; 518 unsigned n; 519 520 if (len > 4) { 521 (void) fprintf(stderr, "limread_scalar: bad length\n"); 522 return 0; 523 } 524 /*LINTED*/ 525 if (/*CONSTCOND*/sizeof(*dest) < 4) { 526 (void) fprintf(stderr, "limread_scalar: bad dest\n"); 527 return 0; 528 } 529 if (!limread(c, len, region, stream)) { 530 return 0; 531 } 532 for (t = 0, n = 0; n < len; ++n) { 533 t = (t << 8) + c[n]; 534 } 535 *dest = t; 536 return 1; 537 } 538 539 /** Read a scalar. 540 * 541 * Read a big-endian scalar of length bytes, respecting packet 542 * boundaries (by calling limread() to read the raw data). 543 * 544 * The value read is stored in a size_t, which is a different size 545 * from an unsigned on some platforms. 546 * 547 * This function makes sure to respect packet boundaries. 548 * 549 * \param *dest The scalar value is stored here 550 * \param length How many bytes make up this scalar (at most 4) 551 * \param *region Pointer to current packet region 552 * \param *stream How to parse 553 * \param *cb The callback 554 * \return 1 on success, 0 on error (calls the cb with OPS_PARSER_ERROR in limread()). 555 * 556 * \see RFC4880 3.1 557 */ 558 static int 559 limread_size_t(size_t *dest, 560 unsigned length, 561 __ops_region_t *region, 562 __ops_stream_t *stream) 563 { 564 unsigned tmp; 565 566 /* 567 * Note that because the scalar is at most 4 bytes, we don't care if 568 * size_t is bigger than usigned 569 */ 570 if (!limread_scalar(&tmp, length, region, stream)) 571 return 0; 572 573 *dest = tmp; 574 return 1; 575 } 576 577 /** Read a timestamp. 578 * 579 * Timestamps in OpenPGP are unix time, i.e. seconds since The Epoch (1.1.1970). They are stored in an unsigned scalar 580 * of 4 bytes. 581 * 582 * This function reads the timestamp using limread_scalar(). 583 * 584 * This function makes sure to respect packet boundaries. 585 * 586 * \param *dest The timestamp is stored here 587 * \param *ptag Pointer to current packet's Packet Tag. 588 * \param *reader Our reader 589 * \param *cb The callback 590 * \return see limread_scalar() 591 * 592 * \see RFC4880 3.5 593 */ 594 static int 595 limited_read_time(time_t *dest, __ops_region_t *region, 596 __ops_stream_t *stream) 597 { 598 unsigned char c; 599 time_t mytime = 0; 600 int i; 601 602 /* 603 * Cannot assume that time_t is 4 octets long - 604 * SunOS 5.10 and NetBSD both have 64-bit time_ts. 605 */ 606 if (/* CONSTCOND */sizeof(time_t) == 4) { 607 return limread_scalar((unsigned *)(void *)dest, 4, region, stream); 608 } 609 for (i = 0; i < 4; i++) { 610 if (!limread(&c, 1, region, stream)) { 611 return 0; 612 } 613 mytime = (mytime << 8) + c; 614 } 615 *dest = mytime; 616 return 1; 617 } 618 619 /** 620 * \ingroup Core_MPI 621 * Read a multiprecision integer. 622 * 623 * Large numbers (multiprecision integers, MPI) are stored in OpenPGP in two parts. First there is a 2 byte scalar 624 * indicating the length of the following MPI in Bits. Then follow the bits that make up the actual number, most 625 * significant bits first (Big Endian). The most significant bit in the MPI is supposed to be 1 (unless the MPI is 626 * encrypted - then it may be different as the bit count refers to the plain text but the bits are encrypted). 627 * 628 * Unused bits (i.e. those filling up the most significant byte from the left to the first bits that counts) are 629 * supposed to be cleared - I guess. XXX - does anything actually say so? 630 * 631 * This function makes sure to respect packet boundaries. 632 * 633 * \param **pgn return the integer there - the BIGNUM is created by BN_bin2bn() and probably needs to be freed 634 * by the caller XXX right ben? 635 * \param *ptag Pointer to current packet's Packet Tag. 636 * \param *reader Our reader 637 * \param *cb The callback 638 * \return 1 on success, 0 on error (by limread_scalar() or limread() or if the MPI is not properly formed (XXX 639 * see comment below - the callback is called with a OPS_PARSER_ERROR in case of an error) 640 * 641 * \see RFC4880 3.2 642 */ 643 static int 644 limread_mpi(BIGNUM **pbn, __ops_region_t *region, __ops_stream_t *stream) 645 { 646 unsigned char buf[NETPGP_BUFSIZ] = ""; 647 /* an MPI has a 2 byte length part. 648 * Length is given in bits, so the 649 * largest we should ever need for 650 * the buffer is NETPGP_BUFSIZ bytes. */ 651 unsigned length; 652 unsigned nonzero; 653 unsigned ret; 654 655 stream->reading_mpi_len = 1; 656 ret = (unsigned)limread_scalar(&length, 2, region, stream); 657 658 stream->reading_mpi_len = 0; 659 if (!ret) 660 return 0; 661 662 nonzero = length & 7; /* there should be this many zero bits in the 663 * MS byte */ 664 if (!nonzero) 665 nonzero = 8; 666 length = (length + 7) / 8; 667 668 if (length == 0) { 669 /* if we try to read a length of 0, then fail */ 670 if (__ops_get_debug_level(__FILE__)) { 671 (void) fprintf(stderr, "limread_mpi: 0 length\n"); 672 } 673 return 0; 674 } 675 if (length > NETPGP_BUFSIZ) { 676 (void) fprintf(stderr, "limread_mpi: bad length\n"); 677 return 0; 678 } 679 if (!limread(buf, length, region, stream)) { 680 return 0; 681 } 682 if (((unsigned)buf[0] >> nonzero) != 0 || 683 !((unsigned)buf[0] & (1U << (nonzero - 1U)))) { 684 OPS_ERROR(&stream->errors, OPS_E_P_MPI_FORMAT_ERROR, "MPI Format error"); 685 /* XXX: Ben, one part of 686 * this constraint does 687 * not apply to 688 * encrypted MPIs the 689 * draft says. -- peter */ 690 return 0; 691 } 692 *pbn = BN_bin2bn(buf, (int)length, NULL); 693 return 1; 694 } 695 696 /** Read some data with a New-Format length from reader. 697 * 698 * \sa Internet-Draft RFC4880.txt Section 4.2.2 699 * 700 * \param *length Where the decoded length will be put 701 * \param *stream How to parse 702 * \return 1 if OK, else 0 703 * 704 */ 705 706 static unsigned 707 read_new_length(unsigned *length, __ops_stream_t *stream) 708 { 709 unsigned char c; 710 711 if (base_read(&c, 1, stream) != 1) 712 return 0; 713 if (c < 192) { 714 /* 1. One-octet packet */ 715 *length = c; 716 return 1; 717 } else if (c >= 192 && c <= 223) { 718 /* 2. Two-octet packet */ 719 unsigned t = (c - 192) << 8; 720 721 if (base_read(&c, 1, stream) != 1) 722 return 0; 723 *length = t + c + 192; 724 return 1; 725 } else if (c == 255) { 726 /* 3. Five-Octet packet */ 727 return _read_scalar(length, 4, stream); 728 } else if (c >= 224 && c < 255) { 729 /* 4. Partial Body Length */ 730 /* XXX - agc - gpg multi-recipient encryption uses this */ 731 OPS_ERROR(&stream->errors, OPS_E_UNIMPLEMENTED, 732 "New format Partial Body Length fields not yet implemented"); 733 return 0; 734 } 735 return 0; 736 } 737 738 /** Read the length information for a new format Packet Tag. 739 * 740 * New style Packet Tags encode the length in one to five octets. This function reads the right amount of bytes and 741 * decodes it to the proper length information. 742 * 743 * This function makes sure to respect packet boundaries. 744 * 745 * \param *length return the length here 746 * \param *ptag Pointer to current packet's Packet Tag. 747 * \param *reader Our reader 748 * \param *cb The callback 749 * \return 1 on success, 0 on error (by limread_scalar() or limread() or if the MPI is not properly formed (XXX 750 * see comment below) 751 * 752 * \see RFC4880 4.2.2 753 * \see __ops_ptag_t 754 */ 755 static int 756 limited_read_new_length(unsigned *length, __ops_region_t *region, 757 __ops_stream_t *stream) 758 { 759 unsigned char c = 0x0; 760 761 if (!limread(&c, 1, region, stream)) { 762 return 0; 763 } 764 if (c < 192) { 765 *length = c; 766 return 1; 767 } 768 if (c < 255) { 769 unsigned t = (c - 192) << 8; 770 771 if (!limread(&c, 1, region, stream)) { 772 return 0; 773 } 774 *length = t + c + 192; 775 return 1; 776 } 777 return limread_scalar(length, 4, region, stream); 778 } 779 780 /** 781 \ingroup Core_Create 782 \brief Free allocated memory 783 */ 784 static void 785 data_free(__ops_data_t *data) 786 { 787 free(data->contents); 788 data->contents = NULL; 789 data->len = 0; 790 } 791 792 /** 793 \ingroup Core_Create 794 \brief Free allocated memory 795 */ 796 static void 797 string_free(char **str) 798 { 799 free(*str); 800 *str = NULL; 801 } 802 803 /** 804 \ingroup Core_Create 805 \brief Free allocated memory 806 */ 807 /* ! Free packet memory, set pointer to NULL */ 808 void 809 __ops_subpacket_free(__ops_subpacket_t *packet) 810 { 811 free(packet->raw); 812 packet->raw = NULL; 813 } 814 815 /** 816 \ingroup Core_Create 817 \brief Free allocated memory 818 */ 819 static void 820 __ops_headers_free(__ops_headers_t *headers) 821 { 822 unsigned n; 823 824 for (n = 0; n < headers->headerc; ++n) { 825 free(headers->headers[n].key); 826 free(headers->headers[n].value); 827 } 828 free(headers->headers); 829 headers->headers = NULL; 830 } 831 832 /** 833 \ingroup Core_Create 834 \brief Free allocated memory 835 */ 836 static void 837 cleartext_trailer_free(__ops_cleartext_trailer_t *trailer) 838 { 839 free(trailer->hash); 840 trailer->hash = NULL; 841 } 842 843 /** 844 \ingroup Core_Create 845 \brief Free allocated memory 846 */ 847 static void 848 __ops_cmd_get_passphrase_free(__ops_seckey_passphrase_t *skp) 849 { 850 if (skp->passphrase && *skp->passphrase) { 851 free(*skp->passphrase); 852 *skp->passphrase = NULL; 853 } 854 } 855 856 /** 857 \ingroup Core_Create 858 \brief Free the memory used when parsing this signature sub-packet type 859 */ 860 static void 861 ss_userdef_free(__ops_ss_userdef_t *ss_userdef) 862 { 863 data_free(&ss_userdef->data); 864 } 865 866 /** 867 \ingroup Core_Create 868 \brief Free the memory used when parsing this signature sub-packet type 869 */ 870 static void 871 ss_reserved_free(__ops_ss_unknown_t *ss_unknown) 872 { 873 data_free(&ss_unknown->data); 874 } 875 876 /** 877 \ingroup Core_Create 878 \brief Free the memory used when parsing this packet type 879 */ 880 static void 881 trust_free(__ops_trust_t *trust) 882 { 883 data_free(&trust->data); 884 } 885 886 /** 887 * \ingroup Core_Create 888 * \brief Free the memory used when parsing a private/experimental PKA signature 889 * \param unknown_sig 890 */ 891 static void 892 free_unknown_sig_pka(__ops_unknown_sig_t *unknown_sig) 893 { 894 data_free(&unknown_sig->data); 895 } 896 897 /** 898 \ingroup Core_Create 899 \brief Free allocated memory 900 */ 901 static void 902 free_BN(BIGNUM **pp) 903 { 904 BN_free(*pp); 905 *pp = NULL; 906 } 907 908 /** 909 * \ingroup Core_Create 910 * \brief Free the memory used when parsing a signature 911 * \param sig 912 */ 913 static void 914 sig_free(__ops_sig_t *sig) 915 { 916 switch (sig->info.key_alg) { 917 case OPS_PKA_RSA: 918 case OPS_PKA_RSA_SIGN_ONLY: 919 free_BN(&sig->info.sig.rsa.sig); 920 break; 921 922 case OPS_PKA_DSA: 923 free_BN(&sig->info.sig.dsa.r); 924 free_BN(&sig->info.sig.dsa.s); 925 break; 926 927 case OPS_PKA_ELGAMAL_ENCRYPT_OR_SIGN: 928 free_BN(&sig->info.sig.elgamal.r); 929 free_BN(&sig->info.sig.elgamal.s); 930 break; 931 932 case OPS_PKA_PRIVATE00: 933 case OPS_PKA_PRIVATE01: 934 case OPS_PKA_PRIVATE02: 935 case OPS_PKA_PRIVATE03: 936 case OPS_PKA_PRIVATE04: 937 case OPS_PKA_PRIVATE05: 938 case OPS_PKA_PRIVATE06: 939 case OPS_PKA_PRIVATE07: 940 case OPS_PKA_PRIVATE08: 941 case OPS_PKA_PRIVATE09: 942 case OPS_PKA_PRIVATE10: 943 free_unknown_sig_pka(&sig->info.sig.unknown); 944 break; 945 946 default: 947 (void) fprintf(stderr, "sig_free: bad sig type\n"); 948 } 949 } 950 951 /** 952 \ingroup Core_Create 953 \brief Free the memory used when parsing this signature sub-packet type 954 \param ss_skapref 955 */ 956 static void 957 ss_skapref_free(__ops_ss_skapref_t *ss_skapref) 958 { 959 data_free(&ss_skapref->data); 960 } 961 962 /** 963 \ingroup Core_Create 964 \brief Free the memory used when parsing this signature sub-packet type 965 \param ss_hashpref 966 */ 967 static void 968 ss_hashpref_free(__ops_ss_hashpref_t *ss_hashpref) 969 { 970 data_free(&ss_hashpref->data); 971 } 972 973 /** 974 \ingroup Core_Create 975 \brief Free the memory used when parsing this signature sub-packet type 976 */ 977 static void 978 ss_zpref_free(__ops_ss_zpref_t *ss_zpref) 979 { 980 data_free(&ss_zpref->data); 981 } 982 983 /** 984 \ingroup Core_Create 985 \brief Free the memory used when parsing this signature sub-packet type 986 */ 987 static void 988 ss_key_flags_free(__ops_ss_key_flags_t *ss_key_flags) 989 { 990 data_free(&ss_key_flags->data); 991 } 992 993 /** 994 \ingroup Core_Create 995 \brief Free the memory used when parsing this signature sub-packet type 996 */ 997 static void 998 ss_key_server_prefs_free(__ops_ss_key_server_prefs_t *ss_key_server_prefs) 999 { 1000 data_free(&ss_key_server_prefs->data); 1001 } 1002 1003 /** 1004 \ingroup Core_Create 1005 \brief Free the memory used when parsing this signature sub-packet type 1006 */ 1007 static void 1008 ss_features_free(__ops_ss_features_t *ss_features) 1009 { 1010 data_free(&ss_features->data); 1011 } 1012 1013 /** 1014 \ingroup Core_Create 1015 \brief Free the memory used when parsing this signature sub-packet type 1016 */ 1017 static void 1018 ss_notation_free(__ops_ss_notation_t *ss_notation) 1019 { 1020 data_free(&ss_notation->name); 1021 data_free(&ss_notation->value); 1022 } 1023 1024 /** 1025 \ingroup Core_Create 1026 \brief Free allocated memory 1027 */ 1028 /* ! Free the memory used when parsing this signature sub-packet type */ 1029 static void 1030 ss_regexp_free(__ops_ss_regexp_t *regexp) 1031 { 1032 string_free(®exp->regexp); 1033 } 1034 1035 /** 1036 \ingroup Core_Create 1037 \brief Free allocated memory 1038 */ 1039 /* ! Free the memory used when parsing this signature sub-packet type */ 1040 static void 1041 ss_policy_free(__ops_ss_policy_t *policy) 1042 { 1043 string_free(&policy->url); 1044 } 1045 1046 /** 1047 \ingroup Core_Create 1048 \brief Free allocated memory 1049 */ 1050 /* ! Free the memory used when parsing this signature sub-packet type */ 1051 static void 1052 ss_keyserv_free(__ops_ss_keyserv_t *preferred_key_server) 1053 { 1054 string_free(&preferred_key_server->name); 1055 } 1056 1057 /** 1058 \ingroup Core_Create 1059 \brief Free the memory used when parsing this signature sub-packet type 1060 */ 1061 static void 1062 ss_revocation_free(__ops_ss_revocation_t *ss_revocation) 1063 { 1064 string_free(&ss_revocation->reason); 1065 } 1066 1067 static void 1068 ss_embedded_sig_free(__ops_ss_embedded_sig_t *ss_embedded_sig) 1069 { 1070 data_free(&ss_embedded_sig->sig); 1071 } 1072 1073 /** 1074 \ingroup Core_Create 1075 \brief Free allocated memory 1076 */ 1077 /* ! Free any memory allocated when parsing the packet content */ 1078 void 1079 __ops_parser_content_free(__ops_packet_t *c) 1080 { 1081 switch (c->tag) { 1082 case OPS_PARSER_PTAG: 1083 case OPS_PTAG_CT_COMPRESSED: 1084 case OPS_PTAG_SS_CREATION_TIME: 1085 case OPS_PTAG_SS_EXPIRATION_TIME: 1086 case OPS_PTAG_SS_KEY_EXPIRY: 1087 case OPS_PTAG_SS_TRUST: 1088 case OPS_PTAG_SS_ISSUER_KEY_ID: 1089 case OPS_PTAG_CT_1_PASS_SIG: 1090 case OPS_PTAG_SS_PRIMARY_USER_ID: 1091 case OPS_PTAG_SS_REVOCABLE: 1092 case OPS_PTAG_SS_REVOCATION_KEY: 1093 case OPS_PTAG_CT_LITDATA_HEADER: 1094 case OPS_PTAG_CT_LITDATA_BODY: 1095 case OPS_PTAG_CT_SIGNED_CLEARTEXT_BODY: 1096 case OPS_PTAG_CT_UNARMOURED_TEXT: 1097 case OPS_PTAG_CT_ARMOUR_TRAILER: 1098 case OPS_PTAG_CT_SIGNATURE_HEADER: 1099 case OPS_PTAG_CT_SE_DATA_HEADER: 1100 case OPS_PTAG_CT_SE_IP_DATA_HEADER: 1101 case OPS_PTAG_CT_SE_IP_DATA_BODY: 1102 case OPS_PTAG_CT_MDC: 1103 case OPS_GET_SECKEY: 1104 break; 1105 1106 case OPS_PTAG_CT_SIGNED_CLEARTEXT_HEADER: 1107 __ops_headers_free(&c->u.cleartext_head.headers); 1108 break; 1109 1110 case OPS_PTAG_CT_ARMOUR_HEADER: 1111 __ops_headers_free(&c->u.armour_header.headers); 1112 break; 1113 1114 case OPS_PTAG_CT_SIGNED_CLEARTEXT_TRAILER: 1115 cleartext_trailer_free(&c->u.cleartext_trailer); 1116 break; 1117 1118 case OPS_PTAG_CT_TRUST: 1119 trust_free(&c->u.trust); 1120 break; 1121 1122 case OPS_PTAG_CT_SIGNATURE: 1123 case OPS_PTAG_CT_SIGNATURE_FOOTER: 1124 sig_free(&c->u.sig); 1125 break; 1126 1127 case OPS_PTAG_CT_PUBLIC_KEY: 1128 case OPS_PTAG_CT_PUBLIC_SUBKEY: 1129 __ops_pubkey_free(&c->u.pubkey); 1130 break; 1131 1132 case OPS_PTAG_CT_USER_ID: 1133 __ops_userid_free(&c->u.userid); 1134 break; 1135 1136 case OPS_PTAG_SS_SIGNERS_USER_ID: 1137 __ops_userid_free(&c->u.ss_signer); 1138 break; 1139 1140 case OPS_PTAG_CT_USER_ATTR: 1141 __ops_userattr_free(&c->u.userattr); 1142 break; 1143 1144 case OPS_PTAG_SS_PREFERRED_SKA: 1145 ss_skapref_free(&c->u.ss_skapref); 1146 break; 1147 1148 case OPS_PTAG_SS_PREFERRED_HASH: 1149 ss_hashpref_free(&c->u.ss_hashpref); 1150 break; 1151 1152 case OPS_PTAG_SS_PREF_COMPRESS: 1153 ss_zpref_free(&c->u.ss_zpref); 1154 break; 1155 1156 case OPS_PTAG_SS_KEY_FLAGS: 1157 ss_key_flags_free(&c->u.ss_key_flags); 1158 break; 1159 1160 case OPS_PTAG_SS_KEYSERV_PREFS: 1161 ss_key_server_prefs_free(&c->u.ss_key_server_prefs); 1162 break; 1163 1164 case OPS_PTAG_SS_FEATURES: 1165 ss_features_free(&c->u.ss_features); 1166 break; 1167 1168 case OPS_PTAG_SS_NOTATION_DATA: 1169 ss_notation_free(&c->u.ss_notation); 1170 break; 1171 1172 case OPS_PTAG_SS_REGEXP: 1173 ss_regexp_free(&c->u.ss_regexp); 1174 break; 1175 1176 case OPS_PTAG_SS_POLICY_URI: 1177 ss_policy_free(&c->u.ss_policy); 1178 break; 1179 1180 case OPS_PTAG_SS_PREF_KEYSERV: 1181 ss_keyserv_free(&c->u.ss_keyserv); 1182 break; 1183 1184 case OPS_PTAG_SS_USERDEFINED00: 1185 case OPS_PTAG_SS_USERDEFINED01: 1186 case OPS_PTAG_SS_USERDEFINED02: 1187 case OPS_PTAG_SS_USERDEFINED03: 1188 case OPS_PTAG_SS_USERDEFINED04: 1189 case OPS_PTAG_SS_USERDEFINED05: 1190 case OPS_PTAG_SS_USERDEFINED06: 1191 case OPS_PTAG_SS_USERDEFINED07: 1192 case OPS_PTAG_SS_USERDEFINED08: 1193 case OPS_PTAG_SS_USERDEFINED09: 1194 case OPS_PTAG_SS_USERDEFINED10: 1195 ss_userdef_free(&c->u.ss_userdef); 1196 break; 1197 1198 case OPS_PTAG_SS_RESERVED: 1199 ss_reserved_free(&c->u.ss_unknown); 1200 break; 1201 1202 case OPS_PTAG_SS_REVOCATION_REASON: 1203 ss_revocation_free(&c->u.ss_revocation); 1204 break; 1205 1206 case OPS_PTAG_SS_EMBEDDED_SIGNATURE: 1207 ss_embedded_sig_free(&c->u.ss_embedded_sig); 1208 break; 1209 1210 case OPS_PARSER_PACKET_END: 1211 __ops_subpacket_free(&c->u.packet); 1212 break; 1213 1214 case OPS_PARSER_ERROR: 1215 case OPS_PARSER_ERRCODE: 1216 break; 1217 1218 case OPS_PTAG_CT_SECRET_KEY: 1219 case OPS_PTAG_CT_ENCRYPTED_SECRET_KEY: 1220 __ops_seckey_free(&c->u.seckey); 1221 break; 1222 1223 case OPS_PTAG_CT_PK_SESSION_KEY: 1224 case OPS_PTAG_CT_ENCRYPTED_PK_SESSION_KEY: 1225 __ops_pk_sesskey_free(&c->u.pk_sesskey); 1226 break; 1227 1228 case OPS_GET_PASSPHRASE: 1229 __ops_cmd_get_passphrase_free(&c->u.skey_passphrase); 1230 break; 1231 1232 default: 1233 fprintf(stderr, "Can't free %d (0x%x)\n", c->tag, c->tag); 1234 } 1235 } 1236 1237 /** 1238 \ingroup Core_Create 1239 \brief Free allocated memory 1240 */ 1241 void 1242 __ops_pk_sesskey_free(__ops_pk_sesskey_t *sk) 1243 { 1244 switch (sk->alg) { 1245 case OPS_PKA_RSA: 1246 free_BN(&sk->params.rsa.encrypted_m); 1247 break; 1248 1249 case OPS_PKA_ELGAMAL: 1250 free_BN(&sk->params.elgamal.g_to_k); 1251 free_BN(&sk->params.elgamal.encrypted_m); 1252 break; 1253 1254 default: 1255 (void) fprintf(stderr, "__ops_pk_sesskey_free: bad alg\n"); 1256 break; 1257 } 1258 } 1259 1260 /** 1261 \ingroup Core_Create 1262 \brief Free allocated memory 1263 */ 1264 /* ! Free the memory used when parsing a public key */ 1265 void 1266 __ops_pubkey_free(__ops_pubkey_t *p) 1267 { 1268 switch (p->alg) { 1269 case OPS_PKA_RSA: 1270 case OPS_PKA_RSA_ENCRYPT_ONLY: 1271 case OPS_PKA_RSA_SIGN_ONLY: 1272 free_BN(&p->key.rsa.n); 1273 free_BN(&p->key.rsa.e); 1274 break; 1275 1276 case OPS_PKA_DSA: 1277 free_BN(&p->key.dsa.p); 1278 free_BN(&p->key.dsa.q); 1279 free_BN(&p->key.dsa.g); 1280 free_BN(&p->key.dsa.y); 1281 break; 1282 1283 case OPS_PKA_ELGAMAL: 1284 case OPS_PKA_ELGAMAL_ENCRYPT_OR_SIGN: 1285 free_BN(&p->key.elgamal.p); 1286 free_BN(&p->key.elgamal.g); 1287 free_BN(&p->key.elgamal.y); 1288 break; 1289 1290 case OPS_PKA_NOTHING: 1291 /* nothing to free */ 1292 break; 1293 1294 default: 1295 (void) fprintf(stderr, "__ops_pubkey_free: bad alg\n"); 1296 } 1297 } 1298 1299 /** 1300 \ingroup Core_ReadPackets 1301 */ 1302 static int 1303 parse_pubkey_data(__ops_pubkey_t *key, __ops_region_t *region, 1304 __ops_stream_t *stream) 1305 { 1306 unsigned char c = 0x0; 1307 1308 if (region->readc != 0) { 1309 /* We should not have read anything so far */ 1310 (void) fprintf(stderr, "parse_pubkey_data: bad length\n"); 1311 return 0; 1312 } 1313 if (!limread(&c, 1, region, stream)) { 1314 return 0; 1315 } 1316 key->version = (__ops_version_t)c; 1317 switch (key->version) { 1318 case OPS_V2: 1319 case OPS_V3: 1320 case OPS_V4: 1321 break; 1322 default: 1323 OPS_ERROR_1(&stream->errors, OPS_E_PROTO_BAD_PUBLIC_KEY_VRSN, 1324 "Bad public key version (0x%02x)", key->version); 1325 return 0; 1326 } 1327 if (!limited_read_time(&key->birthtime, region, stream)) { 1328 return 0; 1329 } 1330 1331 key->days_valid = 0; 1332 if ((key->version == 2 || key->version == 3) && 1333 !limread_scalar(&key->days_valid, 2, region, stream)) { 1334 return 0; 1335 } 1336 1337 if (!limread(&c, 1, region, stream)) { 1338 return 0; 1339 } 1340 key->alg = c; 1341 1342 switch (key->alg) { 1343 case OPS_PKA_DSA: 1344 if (!limread_mpi(&key->key.dsa.p, region, stream) || 1345 !limread_mpi(&key->key.dsa.q, region, stream) || 1346 !limread_mpi(&key->key.dsa.g, region, stream) || 1347 !limread_mpi(&key->key.dsa.y, region, stream)) { 1348 return 0; 1349 } 1350 break; 1351 1352 case OPS_PKA_RSA: 1353 case OPS_PKA_RSA_ENCRYPT_ONLY: 1354 case OPS_PKA_RSA_SIGN_ONLY: 1355 if (!limread_mpi(&key->key.rsa.n, region, stream) || 1356 !limread_mpi(&key->key.rsa.e, region, stream)) { 1357 return 0; 1358 } 1359 break; 1360 1361 case OPS_PKA_ELGAMAL: 1362 case OPS_PKA_ELGAMAL_ENCRYPT_OR_SIGN: 1363 if (!limread_mpi(&key->key.elgamal.p, region, stream) || 1364 !limread_mpi(&key->key.elgamal.g, region, stream) || 1365 !limread_mpi(&key->key.elgamal.y, region, stream)) { 1366 return 0; 1367 } 1368 break; 1369 1370 default: 1371 OPS_ERROR_1(&stream->errors, 1372 OPS_E_ALG_UNSUPPORTED_PUBLIC_KEY_ALG, 1373 "Unsupported Public Key algorithm (%s)", 1374 __ops_show_pka(key->alg)); 1375 return 0; 1376 } 1377 1378 return 1; 1379 } 1380 1381 1382 /** 1383 * \ingroup Core_ReadPackets 1384 * \brief Parse a public key packet. 1385 * 1386 * This function parses an entire v3 (== v2) or v4 public key packet for RSA, ElGamal, and DSA keys. 1387 * 1388 * Once the key has been parsed successfully, it is passed to the callback. 1389 * 1390 * \param *ptag Pointer to the current Packet Tag. This function should consume the entire packet. 1391 * \param *reader Our reader 1392 * \param *cb The callback 1393 * \return 1 on success, 0 on error 1394 * 1395 * \see RFC4880 5.5.2 1396 */ 1397 static int 1398 parse_pubkey(__ops_content_tag_t tag, __ops_region_t *region, 1399 __ops_stream_t *stream) 1400 { 1401 __ops_packet_t pkt; 1402 1403 if (!parse_pubkey_data(&pkt.u.pubkey, region, stream)) 1404 return 0; 1405 1406 /* XXX: this test should be done for all packets, surely? */ 1407 if (region->readc != region->length) { 1408 OPS_ERROR_1(&stream->errors, OPS_E_R_UNCONSUMED_DATA, 1409 "Unconsumed data (%d)", region->length - region->readc); 1410 return 0; 1411 } 1412 CALLBACK(tag, &stream->cbinfo, &pkt); 1413 1414 return 1; 1415 } 1416 1417 1418 /** 1419 \ingroup Core_Create 1420 \brief Free allocated memory 1421 */ 1422 /* ! Free the memory used when parsing this packet type */ 1423 void 1424 __ops_userattr_free(__ops_userattr_t *user_att) 1425 { 1426 data_free(&user_att->data); 1427 } 1428 1429 /** 1430 * \ingroup Core_ReadPackets 1431 * \brief Parse one user attribute packet. 1432 * 1433 * User attribute packets contain one or more attribute subpackets. 1434 * For now, handle the whole packet as raw data. 1435 */ 1436 1437 static int 1438 parse_userattr(__ops_region_t *region, __ops_stream_t *stream) 1439 { 1440 1441 __ops_packet_t pkt; 1442 1443 /* 1444 * xxx- treat as raw data for now. Could break down further into 1445 * attribute sub-packets later - rachel 1446 */ 1447 1448 if (region->readc != 0) { 1449 /* We should not have read anything so far */ 1450 (void) fprintf(stderr, "parse_userattr: bad length\n"); 1451 return 0; 1452 } 1453 1454 if (!read_data(&pkt.u.userattr.data, region, stream)) 1455 return 0; 1456 1457 CALLBACK(OPS_PTAG_CT_USER_ATTR, &stream->cbinfo, &pkt); 1458 1459 return 1; 1460 } 1461 1462 /** 1463 \ingroup Core_Create 1464 \brief Free allocated memory 1465 */ 1466 /* ! Free the memory used when parsing this packet type */ 1467 void 1468 __ops_userid_free(__ops_userid_t *id) 1469 { 1470 free(id->userid); 1471 id->userid = NULL; 1472 } 1473 1474 /** 1475 * \ingroup Core_ReadPackets 1476 * \brief Parse a user id. 1477 * 1478 * This function parses an user id packet, which is basically just a char array the size of the packet. 1479 * 1480 * The char array is to be treated as an UTF-8 string. 1481 * 1482 * The userid gets null terminated by this function. Freeing it is the responsibility of the caller. 1483 * 1484 * Once the userid has been parsed successfully, it is passed to the callback. 1485 * 1486 * \param *ptag Pointer to the Packet Tag. This function should consume the entire packet. 1487 * \param *reader Our reader 1488 * \param *cb The callback 1489 * \return 1 on success, 0 on error 1490 * 1491 * \see RFC4880 5.11 1492 */ 1493 static int 1494 parse_userid(__ops_region_t *region, __ops_stream_t *stream) 1495 { 1496 __ops_packet_t pkt; 1497 1498 if (region->readc != 0) { 1499 /* We should not have read anything so far */ 1500 (void) fprintf(stderr, "parse_userid: bad length\n"); 1501 return 0; 1502 } 1503 1504 if ((pkt.u.userid.userid = calloc(1, region->length + 1)) == NULL) { 1505 (void) fprintf(stderr, "parse_userid: bad alloc\n"); 1506 return 0; 1507 } 1508 1509 if (region->length && 1510 !limread(pkt.u.userid.userid, region->length, region, 1511 stream)) { 1512 return 0; 1513 } 1514 pkt.u.userid.userid[region->length] = '\0'; 1515 CALLBACK(OPS_PTAG_CT_USER_ID, &stream->cbinfo, &pkt); 1516 return 1; 1517 } 1518 1519 static __ops_hash_t * 1520 parse_hash_find(__ops_stream_t *stream, const unsigned char *keyid) 1521 { 1522 __ops_hashtype_t *hp; 1523 size_t n; 1524 1525 for (n = 0, hp = stream->hashes; n < stream->hashc; n++, hp++) { 1526 if (memcmp(hp->keyid, keyid, OPS_KEY_ID_SIZE) == 0) { 1527 return &hp->hash; 1528 } 1529 } 1530 return NULL; 1531 } 1532 1533 /** 1534 * \ingroup Core_Parse 1535 * \brief Parse a version 3 signature. 1536 * 1537 * This function parses an version 3 signature packet, handling RSA and DSA signatures. 1538 * 1539 * Once the signature has been parsed successfully, it is passed to the callback. 1540 * 1541 * \param *ptag Pointer to the Packet Tag. This function should consume the entire packet. 1542 * \param *reader Our reader 1543 * \param *cb The callback 1544 * \return 1 on success, 0 on error 1545 * 1546 * \see RFC4880 5.2.2 1547 */ 1548 static int 1549 parse_v3_sig(__ops_region_t *region, 1550 __ops_stream_t *stream) 1551 { 1552 __ops_packet_t pkt; 1553 unsigned char c = 0x0; 1554 1555 /* clear signature */ 1556 (void) memset(&pkt.u.sig, 0x0, sizeof(pkt.u.sig)); 1557 1558 pkt.u.sig.info.version = OPS_V3; 1559 1560 /* hash info length */ 1561 if (!limread(&c, 1, region, stream)) { 1562 return 0; 1563 } 1564 if (c != 5) { 1565 ERRP(&stream->cbinfo, pkt, "bad hash info length"); 1566 } 1567 1568 if (!limread(&c, 1, region, stream)) { 1569 return 0; 1570 } 1571 pkt.u.sig.info.type = (__ops_sig_type_t)c; 1572 /* XXX: check signature type */ 1573 1574 if (!limited_read_time(&pkt.u.sig.info.birthtime, region, stream)) { 1575 return 0; 1576 } 1577 pkt.u.sig.info.birthtime_set = 1; 1578 1579 if (!limread(pkt.u.sig.info.signer_id, OPS_KEY_ID_SIZE, region, 1580 stream)) { 1581 return 0; 1582 } 1583 pkt.u.sig.info.signer_id_set = 1; 1584 1585 if (!limread(&c, 1, region, stream)) { 1586 return 0; 1587 } 1588 pkt.u.sig.info.key_alg = (__ops_pubkey_alg_t)c; 1589 /* XXX: check algorithm */ 1590 1591 if (!limread(&c, 1, region, stream)) { 1592 return 0; 1593 } 1594 pkt.u.sig.info.hash_alg = (__ops_hash_alg_t)c; 1595 /* XXX: check algorithm */ 1596 1597 if (!limread(pkt.u.sig.hash2, 2, region, stream)) { 1598 return 0; 1599 } 1600 1601 switch (pkt.u.sig.info.key_alg) { 1602 case OPS_PKA_RSA: 1603 case OPS_PKA_RSA_SIGN_ONLY: 1604 if (!limread_mpi(&pkt.u.sig.info.sig.rsa.sig, region, stream)) { 1605 return 0; 1606 } 1607 break; 1608 1609 case OPS_PKA_DSA: 1610 if (!limread_mpi(&pkt.u.sig.info.sig.dsa.r, region, stream) || 1611 !limread_mpi(&pkt.u.sig.info.sig.dsa.s, region, stream)) { 1612 return 0; 1613 } 1614 break; 1615 1616 case OPS_PKA_ELGAMAL_ENCRYPT_OR_SIGN: 1617 if (!limread_mpi(&pkt.u.sig.info.sig.elgamal.r, region, 1618 stream) || 1619 !limread_mpi(&pkt.u.sig.info.sig.elgamal.s, region, 1620 stream)) { 1621 return 0; 1622 } 1623 break; 1624 1625 default: 1626 OPS_ERROR_1(&stream->errors, 1627 OPS_E_ALG_UNSUPPORTED_SIGNATURE_ALG, 1628 "Unsupported signature key algorithm (%s)", 1629 __ops_show_pka(pkt.u.sig.info.key_alg)); 1630 return 0; 1631 } 1632 1633 if (region->readc != region->length) { 1634 OPS_ERROR_1(&stream->errors, OPS_E_R_UNCONSUMED_DATA, 1635 "Unconsumed data (%d)", 1636 region->length - region->readc); 1637 return 0; 1638 } 1639 if (pkt.u.sig.info.signer_id_set) { 1640 pkt.u.sig.hash = parse_hash_find(stream, 1641 pkt.u.sig.info.signer_id); 1642 } 1643 CALLBACK(OPS_PTAG_CT_SIGNATURE, &stream->cbinfo, &pkt); 1644 return 1; 1645 } 1646 1647 /** 1648 * \ingroup Core_ReadPackets 1649 * \brief Parse one signature sub-packet. 1650 * 1651 * Version 4 signatures can have an arbitrary amount of (hashed and 1652 * unhashed) subpackets. Subpackets are used to hold optional 1653 * attributes of subpackets. 1654 * 1655 * This function parses one such signature subpacket. 1656 * 1657 * Once the subpacket has been parsed successfully, it is passed to the callback. 1658 * 1659 * \param *ptag Pointer to the Packet Tag. This function should consume the entire subpacket. 1660 * \param *reader Our reader 1661 * \param *cb The callback 1662 * \return 1 on success, 0 on error 1663 * 1664 * \see RFC4880 5.2.3 1665 */ 1666 static int 1667 parse_one_sig_subpacket(__ops_sig_t *sig, 1668 __ops_region_t *region, 1669 __ops_stream_t *stream) 1670 { 1671 __ops_region_t subregion; 1672 __ops_packet_t pkt; 1673 unsigned char bools = 0x0; 1674 unsigned char c = 0x0; 1675 unsigned doread = 1; 1676 unsigned t8; 1677 unsigned t7; 1678 1679 __ops_init_subregion(&subregion, region); 1680 if (!limited_read_new_length(&subregion.length, region, stream)) { 1681 return 0; 1682 } 1683 1684 if (subregion.length > region->length) { 1685 ERRP(&stream->cbinfo, pkt, "Subpacket too long"); 1686 } 1687 1688 if (!limread(&c, 1, &subregion, stream)) { 1689 return 0; 1690 } 1691 1692 t8 = (c & 0x7f) / 8; 1693 t7 = 1 << (c & 7); 1694 1695 pkt.critical = (unsigned)c >> 7; 1696 pkt.tag = (__ops_content_tag_t)(OPS_PTAG_SIG_SUBPKT_BASE + (c & 0x7f)); 1697 1698 /* Application wants it delivered raw */ 1699 if (stream->ss_raw[t8] & t7) { 1700 pkt.u.ss_raw.tag = pkt.tag; 1701 pkt.u.ss_raw.length = subregion.length - 1; 1702 pkt.u.ss_raw.raw = calloc(1, pkt.u.ss_raw.length); 1703 if (pkt.u.ss_raw.raw == NULL) { 1704 (void) fprintf(stderr, "parse_one_sig_subpacket: bad alloc\n"); 1705 return 0; 1706 } 1707 if (!limread(pkt.u.ss_raw.raw, pkt.u.ss_raw.length, 1708 &subregion, stream)) { 1709 return 0; 1710 } 1711 CALLBACK(OPS_PTAG_RAW_SS, &stream->cbinfo, &pkt); 1712 return 1; 1713 } 1714 switch (pkt.tag) { 1715 case OPS_PTAG_SS_CREATION_TIME: 1716 case OPS_PTAG_SS_EXPIRATION_TIME: 1717 case OPS_PTAG_SS_KEY_EXPIRY: 1718 if (!limited_read_time(&pkt.u.ss_time.time, &subregion, stream)) 1719 return 0; 1720 if (pkt.tag == OPS_PTAG_SS_CREATION_TIME) { 1721 sig->info.birthtime = pkt.u.ss_time.time; 1722 sig->info.birthtime_set = 1; 1723 } 1724 if (pkt.tag == OPS_PTAG_SS_EXPIRATION_TIME) { 1725 sig->info.duration = pkt.u.ss_time.time; 1726 sig->info.duration_set = 1; 1727 } 1728 break; 1729 1730 case OPS_PTAG_SS_TRUST: 1731 if (!limread(&pkt.u.ss_trust.level, 1, &subregion, stream) || 1732 !limread(&pkt.u.ss_trust.amount, 1, &subregion, stream)) { 1733 return 0; 1734 } 1735 break; 1736 1737 case OPS_PTAG_SS_REVOCABLE: 1738 if (!limread(&bools, 1, &subregion, stream)) { 1739 return 0; 1740 } 1741 pkt.u.ss_revocable.revocable = !!bools; 1742 break; 1743 1744 case OPS_PTAG_SS_ISSUER_KEY_ID: 1745 if (!limread(pkt.u.ss_issuer.key_id, OPS_KEY_ID_SIZE, 1746 &subregion, stream)) { 1747 return 0; 1748 } 1749 (void) memcpy(sig->info.signer_id, 1750 pkt.u.ss_issuer.key_id, OPS_KEY_ID_SIZE); 1751 sig->info.signer_id_set = 1; 1752 break; 1753 1754 case OPS_PTAG_SS_PREFERRED_SKA: 1755 if (!read_data(&pkt.u.ss_skapref.data, &subregion, stream)) { 1756 return 0; 1757 } 1758 break; 1759 1760 case OPS_PTAG_SS_PREFERRED_HASH: 1761 if (!read_data(&pkt.u.ss_hashpref.data, &subregion, stream)) { 1762 return 0; 1763 } 1764 break; 1765 1766 case OPS_PTAG_SS_PREF_COMPRESS: 1767 if (!read_data(&pkt.u.ss_zpref.data, 1768 &subregion, stream)) { 1769 return 0; 1770 } 1771 break; 1772 1773 case OPS_PTAG_SS_PRIMARY_USER_ID: 1774 if (!limread(&bools, 1, &subregion, stream)) { 1775 return 0; 1776 } 1777 pkt.u.ss_primary_userid.primary_userid = !!bools; 1778 break; 1779 1780 case OPS_PTAG_SS_KEY_FLAGS: 1781 if (!read_data(&pkt.u.ss_key_flags.data, &subregion, stream)) { 1782 return 0; 1783 } 1784 break; 1785 1786 case OPS_PTAG_SS_KEYSERV_PREFS: 1787 if (!read_data(&pkt.u.ss_key_server_prefs.data, &subregion, 1788 stream)) { 1789 return 0; 1790 } 1791 break; 1792 1793 case OPS_PTAG_SS_FEATURES: 1794 if (!read_data(&pkt.u.ss_features.data, &subregion, stream)) { 1795 return 0; 1796 } 1797 break; 1798 1799 case OPS_PTAG_SS_SIGNERS_USER_ID: 1800 if (!read_unsig_str(&pkt.u.ss_signer.userid, &subregion, 1801 stream)) { 1802 return 0; 1803 } 1804 break; 1805 1806 case OPS_PTAG_SS_EMBEDDED_SIGNATURE: 1807 /* \todo should do something with this sig? */ 1808 if (!read_data(&pkt.u.ss_embedded_sig.sig, &subregion, stream)) { 1809 return 0; 1810 } 1811 break; 1812 1813 case OPS_PTAG_SS_NOTATION_DATA: 1814 if (!limread_data(&pkt.u.ss_notation.flags, 4, 1815 &subregion, stream)) { 1816 return 0; 1817 } 1818 if (!limread_size_t(&pkt.u.ss_notation.name.len, 2, 1819 &subregion, stream)) { 1820 return 0; 1821 } 1822 if (!limread_size_t(&pkt.u.ss_notation.value.len, 2, 1823 &subregion, stream)) { 1824 return 0; 1825 } 1826 if (!limread_data(&pkt.u.ss_notation.name, 1827 pkt.u.ss_notation.name.len, 1828 &subregion, stream)) { 1829 return 0; 1830 } 1831 if (!limread_data(&pkt.u.ss_notation.value, 1832 pkt.u.ss_notation.value.len, 1833 &subregion, stream)) { 1834 return 0; 1835 } 1836 break; 1837 1838 case OPS_PTAG_SS_POLICY_URI: 1839 if (!read_string(&pkt.u.ss_policy.url, &subregion, stream)) { 1840 return 0; 1841 } 1842 break; 1843 1844 case OPS_PTAG_SS_REGEXP: 1845 if (!read_string(&pkt.u.ss_regexp.regexp, &subregion, stream)) { 1846 return 0; 1847 } 1848 break; 1849 1850 case OPS_PTAG_SS_PREF_KEYSERV: 1851 if (!read_string(&pkt.u.ss_keyserv.name, &subregion, stream)) { 1852 return 0; 1853 } 1854 break; 1855 1856 case OPS_PTAG_SS_USERDEFINED00: 1857 case OPS_PTAG_SS_USERDEFINED01: 1858 case OPS_PTAG_SS_USERDEFINED02: 1859 case OPS_PTAG_SS_USERDEFINED03: 1860 case OPS_PTAG_SS_USERDEFINED04: 1861 case OPS_PTAG_SS_USERDEFINED05: 1862 case OPS_PTAG_SS_USERDEFINED06: 1863 case OPS_PTAG_SS_USERDEFINED07: 1864 case OPS_PTAG_SS_USERDEFINED08: 1865 case OPS_PTAG_SS_USERDEFINED09: 1866 case OPS_PTAG_SS_USERDEFINED10: 1867 if (!read_data(&pkt.u.ss_userdef.data, &subregion, stream)) { 1868 return 0; 1869 } 1870 break; 1871 1872 case OPS_PTAG_SS_RESERVED: 1873 if (!read_data(&pkt.u.ss_unknown.data, &subregion, stream)) { 1874 return 0; 1875 } 1876 break; 1877 1878 case OPS_PTAG_SS_REVOCATION_REASON: 1879 /* first byte is the machine-readable code */ 1880 if (!limread(&pkt.u.ss_revocation.code, 1, &subregion, stream)) { 1881 return 0; 1882 } 1883 /* the rest is a human-readable UTF-8 string */ 1884 if (!read_string(&pkt.u.ss_revocation.reason, &subregion, 1885 stream)) { 1886 return 0; 1887 } 1888 break; 1889 1890 case OPS_PTAG_SS_REVOCATION_KEY: 1891 /* octet 0 = class. Bit 0x80 must be set */ 1892 if (!limread(&pkt.u.ss_revocation_key.class, 1, 1893 &subregion, stream)) { 1894 return 0; 1895 } 1896 if (!(pkt.u.ss_revocation_key.class & 0x80)) { 1897 printf("Warning: OPS_PTAG_SS_REVOCATION_KEY class: " 1898 "Bit 0x80 should be set\n"); 1899 return 0; 1900 } 1901 /* octet 1 = algid */ 1902 if (!limread(&pkt.u.ss_revocation_key.algid, 1, 1903 &subregion, stream)) { 1904 return 0; 1905 } 1906 /* octets 2-21 = fingerprint */ 1907 if (!limread(&pkt.u.ss_revocation_key.fingerprint[0], 1908 OPS_FINGERPRINT_SIZE, &subregion, stream)) { 1909 return 0; 1910 } 1911 break; 1912 1913 default: 1914 if (stream->ss_parsed[t8] & t7) { 1915 OPS_ERROR_1(&stream->errors, OPS_E_PROTO_UNKNOWN_SS, 1916 "Unknown signature subpacket type (%d)", 1917 c & 0x7f); 1918 } 1919 doread = 0; 1920 break; 1921 } 1922 1923 /* Application doesn't want it delivered parsed */ 1924 if (!(stream->ss_parsed[t8] & t7)) { 1925 if (pkt.critical) { 1926 OPS_ERROR_1(&stream->errors, 1927 OPS_E_PROTO_CRITICAL_SS_IGNORED, 1928 "Critical signature subpacket ignored (%d)", 1929 c & 0x7f); 1930 } 1931 if (!doread && 1932 !limskip(subregion.length - 1, &subregion, stream)) { 1933 return 0; 1934 } 1935 if (doread) { 1936 __ops_parser_content_free(&pkt); 1937 } 1938 return 1; 1939 } 1940 if (doread && subregion.readc != subregion.length) { 1941 OPS_ERROR_1(&stream->errors, OPS_E_R_UNCONSUMED_DATA, 1942 "Unconsumed data (%d)", 1943 subregion.length - subregion.readc); 1944 return 0; 1945 } 1946 CALLBACK(pkt.tag, &stream->cbinfo, &pkt); 1947 return 1; 1948 } 1949 1950 /** 1951 * \ingroup Core_ReadPackets 1952 * \brief Parse several signature subpackets. 1953 * 1954 * Hashed and unhashed subpacket sets are preceded by an octet count that specifies the length of the complete set. 1955 * This function parses this length and then calls parse_one_sig_subpacket() for each subpacket until the 1956 * entire set is consumed. 1957 * 1958 * This function does not call the callback directly, parse_one_sig_subpacket() does for each subpacket. 1959 * 1960 * \param *ptag Pointer to the Packet Tag. 1961 * \param *reader Our reader 1962 * \param *cb The callback 1963 * \return 1 on success, 0 on error 1964 * 1965 * \see RFC4880 5.2.3 1966 */ 1967 static int 1968 parse_sig_subpkts(__ops_sig_t *sig, 1969 __ops_region_t *region, 1970 __ops_stream_t *stream) 1971 { 1972 __ops_region_t subregion; 1973 __ops_packet_t pkt; 1974 1975 __ops_init_subregion(&subregion, region); 1976 if (!limread_scalar(&subregion.length, 2, region, stream)) { 1977 return 0; 1978 } 1979 1980 if (subregion.length > region->length) { 1981 ERRP(&stream->cbinfo, pkt, "Subpacket set too long"); 1982 } 1983 1984 while (subregion.readc < subregion.length) { 1985 if (!parse_one_sig_subpacket(sig, &subregion, stream)) { 1986 return 0; 1987 } 1988 } 1989 1990 if (subregion.readc != subregion.length) { 1991 if (!limskip(subregion.length - subregion.readc, 1992 &subregion, stream)) { 1993 ERRP(&stream->cbinfo, pkt, 1994 "parse_sig_subpkts: subpacket length read mismatch"); 1995 } 1996 ERRP(&stream->cbinfo, pkt, "Subpacket length mismatch"); 1997 } 1998 return 1; 1999 } 2000 2001 /** 2002 * \ingroup Core_ReadPackets 2003 * \brief Parse a version 4 signature. 2004 * 2005 * This function parses a version 4 signature including all its hashed and unhashed subpackets. 2006 * 2007 * Once the signature packet has been parsed successfully, it is passed to the callback. 2008 * 2009 * \param *ptag Pointer to the Packet Tag. 2010 * \param *reader Our reader 2011 * \param *cb The callback 2012 * \return 1 on success, 0 on error 2013 * 2014 * \see RFC4880 5.2.3 2015 */ 2016 static int 2017 parse_v4_sig(__ops_region_t *region, __ops_stream_t *stream) 2018 { 2019 unsigned char c = 0x0; 2020 __ops_packet_t pkt; 2021 2022 if (__ops_get_debug_level(__FILE__)) { 2023 fprintf(stderr, "\nparse_v4_sig\n"); 2024 } 2025 /* clear signature */ 2026 (void) memset(&pkt.u.sig, 0x0, sizeof(pkt.u.sig)); 2027 2028 /* 2029 * We need to hash the packet data from version through the hashed 2030 * subpacket data 2031 */ 2032 2033 pkt.u.sig.v4_hashstart = stream->readinfo.alength - 1; 2034 2035 /* Set version,type,algorithms */ 2036 2037 pkt.u.sig.info.version = OPS_V4; 2038 2039 if (!limread(&c, 1, region, stream)) { 2040 return 0; 2041 } 2042 pkt.u.sig.info.type = (__ops_sig_type_t)c; 2043 if (__ops_get_debug_level(__FILE__)) { 2044 fprintf(stderr, "signature type=%d (%s)\n", 2045 pkt.u.sig.info.type, 2046 __ops_show_sig_type(pkt.u.sig.info.type)); 2047 } 2048 /* XXX: check signature type */ 2049 2050 if (!limread(&c, 1, region, stream)) { 2051 return 0; 2052 } 2053 pkt.u.sig.info.key_alg = (__ops_pubkey_alg_t)c; 2054 /* XXX: check key algorithm */ 2055 if (__ops_get_debug_level(__FILE__)) { 2056 (void) fprintf(stderr, "key_alg=%d (%s)\n", 2057 pkt.u.sig.info.key_alg, 2058 __ops_show_pka(pkt.u.sig.info.key_alg)); 2059 } 2060 if (!limread(&c, 1, region, stream)) { 2061 return 0; 2062 } 2063 pkt.u.sig.info.hash_alg = (__ops_hash_alg_t)c; 2064 /* XXX: check hash algorithm */ 2065 if (__ops_get_debug_level(__FILE__)) { 2066 fprintf(stderr, "hash_alg=%d %s\n", 2067 pkt.u.sig.info.hash_alg, 2068 __ops_show_hash_alg(pkt.u.sig.info.hash_alg)); 2069 } 2070 CALLBACK(OPS_PTAG_CT_SIGNATURE_HEADER, &stream->cbinfo, &pkt); 2071 2072 if (!parse_sig_subpkts(&pkt.u.sig, region, stream)) { 2073 return 0; 2074 } 2075 2076 pkt.u.sig.info.v4_hashlen = stream->readinfo.alength 2077 - pkt.u.sig.v4_hashstart; 2078 if (__ops_get_debug_level(__FILE__)) { 2079 fprintf(stderr, "v4_hashlen=%zd\n", pkt.u.sig.info.v4_hashlen); 2080 } 2081 2082 /* copy hashed subpackets */ 2083 if (pkt.u.sig.info.v4_hashed) { 2084 free(pkt.u.sig.info.v4_hashed); 2085 } 2086 pkt.u.sig.info.v4_hashed = calloc(1, pkt.u.sig.info.v4_hashlen); 2087 if (pkt.u.sig.info.v4_hashed == NULL) { 2088 (void) fprintf(stderr, "parse_v4_sig: bad alloc\n"); 2089 return 0; 2090 } 2091 2092 if (!stream->readinfo.accumulate) { 2093 /* We must accumulate, else we can't check the signature */ 2094 fprintf(stderr, "*** ERROR: must set accumulate to 1\n"); 2095 return 0; 2096 } 2097 (void) memcpy(pkt.u.sig.info.v4_hashed, 2098 stream->readinfo.accumulated + pkt.u.sig.v4_hashstart, 2099 pkt.u.sig.info.v4_hashlen); 2100 2101 if (!parse_sig_subpkts(&pkt.u.sig, region, stream)) { 2102 return 0; 2103 } 2104 2105 if (!limread(pkt.u.sig.hash2, 2, region, stream)) { 2106 return 0; 2107 } 2108 2109 switch (pkt.u.sig.info.key_alg) { 2110 case OPS_PKA_RSA: 2111 if (!limread_mpi(&pkt.u.sig.info.sig.rsa.sig, region, stream)) { 2112 return 0; 2113 } 2114 if (__ops_get_debug_level(__FILE__)) { 2115 (void) fprintf(stderr, "parse_v4_sig: RSA: sig is\n"); 2116 BN_print_fp(stderr, pkt.u.sig.info.sig.rsa.sig); 2117 } 2118 break; 2119 2120 case OPS_PKA_DSA: 2121 if (!limread_mpi(&pkt.u.sig.info.sig.dsa.r, region, stream)) { 2122 /* 2123 * usually if this fails, it just means we've reached 2124 * the end of the keyring 2125 */ 2126 if (__ops_get_debug_level(__FILE__)) { 2127 (void) fprintf(stderr, 2128 "Error reading DSA r field in signature"); 2129 } 2130 return 0; 2131 } 2132 if (!limread_mpi(&pkt.u.sig.info.sig.dsa.s, region, stream)) { 2133 ERRP(&stream->cbinfo, pkt, 2134 "Error reading DSA s field in signature"); 2135 } 2136 break; 2137 2138 case OPS_PKA_ELGAMAL_ENCRYPT_OR_SIGN: 2139 if (!limread_mpi(&pkt.u.sig.info.sig.elgamal.r, region, 2140 stream) || 2141 !limread_mpi(&pkt.u.sig.info.sig.elgamal.s, region, 2142 stream)) { 2143 return 0; 2144 } 2145 break; 2146 2147 case OPS_PKA_PRIVATE00: 2148 case OPS_PKA_PRIVATE01: 2149 case OPS_PKA_PRIVATE02: 2150 case OPS_PKA_PRIVATE03: 2151 case OPS_PKA_PRIVATE04: 2152 case OPS_PKA_PRIVATE05: 2153 case OPS_PKA_PRIVATE06: 2154 case OPS_PKA_PRIVATE07: 2155 case OPS_PKA_PRIVATE08: 2156 case OPS_PKA_PRIVATE09: 2157 case OPS_PKA_PRIVATE10: 2158 if (!read_data(&pkt.u.sig.info.sig.unknown.data, region, 2159 stream)) { 2160 return 0; 2161 } 2162 break; 2163 2164 default: 2165 OPS_ERROR_1(&stream->errors, OPS_E_ALG_UNSUPPORTED_SIGNATURE_ALG, 2166 "Bad v4 signature key algorithm (%s)", 2167 __ops_show_pka(pkt.u.sig.info.key_alg)); 2168 return 0; 2169 } 2170 if (region->readc != region->length) { 2171 OPS_ERROR_1(&stream->errors, OPS_E_R_UNCONSUMED_DATA, 2172 "Unconsumed data (%d)", 2173 region->length - region->readc); 2174 return 0; 2175 } 2176 CALLBACK(OPS_PTAG_CT_SIGNATURE_FOOTER, &stream->cbinfo, &pkt); 2177 return 1; 2178 } 2179 2180 /** 2181 * \ingroup Core_ReadPackets 2182 * \brief Parse a signature subpacket. 2183 * 2184 * This function calls the appropriate function to handle v3 or v4 signatures. 2185 * 2186 * Once the signature packet has been parsed successfully, it is passed to the callback. 2187 * 2188 * \param *ptag Pointer to the Packet Tag. 2189 * \param *reader Our reader 2190 * \param *cb The callback 2191 * \return 1 on success, 0 on error 2192 */ 2193 static int 2194 parse_sig(__ops_region_t *region, __ops_stream_t *stream) 2195 { 2196 unsigned char c = 0x0; 2197 __ops_packet_t pkt; 2198 2199 if (region->readc != 0) { 2200 /* We should not have read anything so far */ 2201 (void) fprintf(stderr, "parse_sig: bad length\n"); 2202 return 0; 2203 } 2204 2205 (void) memset(&pkt, 0x0, sizeof(pkt)); 2206 if (!limread(&c, 1, region, stream)) { 2207 return 0; 2208 } 2209 if (c == 2 || c == 3) { 2210 return parse_v3_sig(region, stream); 2211 } 2212 if (c == 4) { 2213 return parse_v4_sig(region, stream); 2214 } 2215 OPS_ERROR_1(&stream->errors, OPS_E_PROTO_BAD_SIGNATURE_VRSN, 2216 "Bad signature version (%d)", c); 2217 return 0; 2218 } 2219 2220 /** 2221 \ingroup Core_ReadPackets 2222 \brief Parse Compressed packet 2223 */ 2224 static int 2225 parse_compressed(__ops_region_t *region, __ops_stream_t *stream) 2226 { 2227 __ops_packet_t pkt; 2228 unsigned char c = 0x0; 2229 2230 if (!limread(&c, 1, region, stream)) { 2231 return 0; 2232 } 2233 2234 pkt.u.compressed.type = (__ops_compression_type_t)c; 2235 2236 CALLBACK(OPS_PTAG_CT_COMPRESSED, &stream->cbinfo, &pkt); 2237 2238 /* 2239 * The content of a compressed data packet is more OpenPGP packets 2240 * once decompressed, so recursively handle them 2241 */ 2242 2243 return __ops_decompress(region, stream, pkt.u.compressed.type); 2244 } 2245 2246 /* XXX: this could be improved by sharing all hashes that are the */ 2247 /* same, then duping them just before checking the signature. */ 2248 static void 2249 parse_hash_init(__ops_stream_t *stream, __ops_hash_alg_t type, 2250 const unsigned char *keyid) 2251 { 2252 __ops_hashtype_t *hash; 2253 2254 hash = realloc(stream->hashes, 2255 (stream->hashc + 1) * sizeof(*stream->hashes)); 2256 if (hash == NULL) { 2257 (void) fprintf(stderr, "parse_hash_init: bad alloc 0\n"); 2258 /* just continue and die here */ 2259 /* XXX - agc - no way to return failure */ 2260 } else { 2261 stream->hashes = hash; 2262 } 2263 hash = &stream->hashes[stream->hashc++]; 2264 2265 __ops_hash_any(&hash->hash, type); 2266 if (!hash->hash.init(&hash->hash)) { 2267 (void) fprintf(stderr, "parse_hash_init: bad alloc\n"); 2268 /* just continue and die here */ 2269 /* XXX - agc - no way to return failure */ 2270 } 2271 (void) memcpy(hash->keyid, keyid, sizeof(hash->keyid)); 2272 } 2273 2274 /** 2275 \ingroup Core_ReadPackets 2276 \brief Parse a One Pass Signature packet 2277 */ 2278 static int 2279 parse_one_pass(__ops_region_t * region, __ops_stream_t * stream) 2280 { 2281 unsigned char c = 0x0; 2282 __ops_packet_t pkt; 2283 2284 if (!limread(&pkt.u.one_pass_sig.version, 1, region, stream)) { 2285 return 0; 2286 } 2287 if (pkt.u.one_pass_sig.version != 3) { 2288 OPS_ERROR_1(&stream->errors, OPS_E_PROTO_BAD_ONE_PASS_SIG_VRSN, 2289 "Bad one-pass signature version (%d)", 2290 pkt.u.one_pass_sig.version); 2291 return 0; 2292 } 2293 if (!limread(&c, 1, region, stream)) { 2294 return 0; 2295 } 2296 pkt.u.one_pass_sig.sig_type = (__ops_sig_type_t)c; 2297 2298 if (!limread(&c, 1, region, stream)) { 2299 return 0; 2300 } 2301 pkt.u.one_pass_sig.hash_alg = (__ops_hash_alg_t)c; 2302 2303 if (!limread(&c, 1, region, stream)) { 2304 return 0; 2305 } 2306 pkt.u.one_pass_sig.key_alg = (__ops_pubkey_alg_t)c; 2307 2308 if (!limread(pkt.u.one_pass_sig.keyid, 2309 sizeof(pkt.u.one_pass_sig.keyid), region, stream)) { 2310 return 0; 2311 } 2312 2313 if (!limread(&c, 1, region, stream)) { 2314 return 0; 2315 } 2316 pkt.u.one_pass_sig.nested = !!c; 2317 CALLBACK(OPS_PTAG_CT_1_PASS_SIG, &stream->cbinfo, &pkt); 2318 /* XXX: we should, perhaps, let the app choose whether to hash or not */ 2319 parse_hash_init(stream, pkt.u.one_pass_sig.hash_alg, 2320 pkt.u.one_pass_sig.keyid); 2321 return 1; 2322 } 2323 2324 /** 2325 \ingroup Core_ReadPackets 2326 \brief Parse a Trust packet 2327 */ 2328 static int 2329 parse_trust(__ops_region_t *region, __ops_stream_t *stream) 2330 { 2331 __ops_packet_t pkt; 2332 2333 if (!read_data(&pkt.u.trust.data, region, stream)) { 2334 return 0; 2335 } 2336 CALLBACK(OPS_PTAG_CT_TRUST, &stream->cbinfo, &pkt); 2337 return 1; 2338 } 2339 2340 static void 2341 parse_hash_data(__ops_stream_t *stream, const void *data, 2342 size_t length) 2343 { 2344 size_t n; 2345 2346 for (n = 0; n < stream->hashc; ++n) { 2347 stream->hashes[n].hash.add(&stream->hashes[n].hash, data, length); 2348 } 2349 } 2350 2351 /** 2352 \ingroup Core_ReadPackets 2353 \brief Parse a Literal Data packet 2354 */ 2355 static int 2356 parse_litdata(__ops_region_t *region, __ops_stream_t *stream) 2357 { 2358 __ops_memory_t *mem; 2359 __ops_packet_t pkt; 2360 unsigned char c = 0x0; 2361 2362 if (!limread(&c, 1, region, stream)) { 2363 return 0; 2364 } 2365 pkt.u.litdata_header.format = (__ops_litdata_type_t)c; 2366 if (!limread(&c, 1, region, stream)) { 2367 return 0; 2368 } 2369 if (!limread((unsigned char *)pkt.u.litdata_header.filename, 2370 (unsigned)c, region, stream)) { 2371 return 0; 2372 } 2373 pkt.u.litdata_header.filename[c] = '\0'; 2374 if (!limited_read_time(&pkt.u.litdata_header.mtime, region, stream)) { 2375 return 0; 2376 } 2377 CALLBACK(OPS_PTAG_CT_LITDATA_HEADER, &stream->cbinfo, &pkt); 2378 mem = pkt.u.litdata_body.mem = __ops_memory_new(); 2379 __ops_memory_init(pkt.u.litdata_body.mem, 2380 (unsigned)((region->length * 101) / 100) + 12); 2381 pkt.u.litdata_body.data = mem->buf; 2382 2383 while (region->readc < region->length) { 2384 unsigned readc = region->length - region->readc; 2385 2386 if (!limread(mem->buf, readc, region, stream)) { 2387 return 0; 2388 } 2389 pkt.u.litdata_body.length = readc; 2390 parse_hash_data(stream, pkt.u.litdata_body.data, region->length); 2391 CALLBACK(OPS_PTAG_CT_LITDATA_BODY, &stream->cbinfo, &pkt); 2392 } 2393 2394 /* XXX - get rid of mem here? */ 2395 2396 return 1; 2397 } 2398 2399 /** 2400 * \ingroup Core_Create 2401 * 2402 * __ops_seckey_free() frees the memory associated with "key". Note that 2403 * the key itself is not freed. 2404 * 2405 * \param key 2406 */ 2407 2408 void 2409 __ops_seckey_free(__ops_seckey_t *key) 2410 { 2411 switch (key->pubkey.alg) { 2412 case OPS_PKA_RSA: 2413 case OPS_PKA_RSA_ENCRYPT_ONLY: 2414 case OPS_PKA_RSA_SIGN_ONLY: 2415 free_BN(&key->key.rsa.d); 2416 free_BN(&key->key.rsa.p); 2417 free_BN(&key->key.rsa.q); 2418 free_BN(&key->key.rsa.u); 2419 break; 2420 2421 case OPS_PKA_DSA: 2422 free_BN(&key->key.dsa.x); 2423 break; 2424 2425 default: 2426 (void) fprintf(stderr, 2427 "__ops_seckey_free: Unknown algorithm: %d (%s)\n", 2428 key->pubkey.alg, 2429 __ops_show_pka(key->pubkey.alg)); 2430 } 2431 free(key->checkhash); 2432 __ops_pubkey_free(&key->pubkey); 2433 } 2434 2435 static int 2436 consume_packet(__ops_region_t *region, __ops_stream_t *stream, unsigned warn) 2437 { 2438 __ops_packet_t pkt; 2439 __ops_data_t remainder; 2440 2441 if (region->indeterminate) { 2442 ERRP(&stream->cbinfo, pkt, 2443 "Can't consume indeterminate packets"); 2444 } 2445 2446 if (read_data(&remainder, region, stream)) { 2447 /* now throw it away */ 2448 data_free(&remainder); 2449 if (warn) { 2450 OPS_ERROR(&stream->errors, OPS_E_P_PACKET_CONSUMED, 2451 "Warning: packet consumer"); 2452 } 2453 return 1; 2454 } 2455 OPS_ERROR(&stream->errors, OPS_E_P_PACKET_NOT_CONSUMED, 2456 (warn) ? "Warning: Packet was not consumed" : 2457 "Packet was not consumed"); 2458 return warn; 2459 } 2460 2461 /** 2462 * \ingroup Core_ReadPackets 2463 * \brief Parse a secret key 2464 */ 2465 static int 2466 parse_seckey(__ops_region_t *region, __ops_stream_t *stream) 2467 { 2468 __ops_packet_t pkt; 2469 __ops_region_t encregion; 2470 __ops_region_t *saved_region = NULL; 2471 unsigned char c = 0x0; 2472 __ops_crypt_t decrypt; 2473 __ops_hash_t checkhash; 2474 unsigned blocksize; 2475 unsigned crypted; 2476 int ret = 1; 2477 2478 if (__ops_get_debug_level(__FILE__)) { 2479 fprintf(stderr, "\n---------\nparse_seckey:\n"); 2480 fprintf(stderr, 2481 "region length=%u, readc=%u, remainder=%u\n", 2482 region->length, region->readc, 2483 region->length - region->readc); 2484 } 2485 (void) memset(&pkt, 0x0, sizeof(pkt)); 2486 if (!parse_pubkey_data(&pkt.u.seckey.pubkey, region, stream)) { 2487 return 0; 2488 } 2489 if (__ops_get_debug_level(__FILE__)) { 2490 fprintf(stderr, "parse_seckey: public key parsed\n"); 2491 __ops_print_pubkey(&pkt.u.seckey.pubkey); 2492 } 2493 stream->reading_v3_secret = (pkt.u.seckey.pubkey.version != OPS_V4); 2494 2495 if (!limread(&c, 1, region, stream)) { 2496 return 0; 2497 } 2498 pkt.u.seckey.s2k_usage = (__ops_s2k_usage_t)c; 2499 2500 if (pkt.u.seckey.s2k_usage == OPS_S2KU_ENCRYPTED || 2501 pkt.u.seckey.s2k_usage == OPS_S2KU_ENCRYPTED_AND_HASHED) { 2502 if (!limread(&c, 1, region, stream)) { 2503 return 0; 2504 } 2505 pkt.u.seckey.alg = (__ops_symm_alg_t)c; 2506 if (!limread(&c, 1, region, stream)) { 2507 return 0; 2508 } 2509 pkt.u.seckey.s2k_specifier = (__ops_s2k_specifier_t)c; 2510 switch (pkt.u.seckey.s2k_specifier) { 2511 case OPS_S2KS_SIMPLE: 2512 case OPS_S2KS_SALTED: 2513 case OPS_S2KS_ITERATED_AND_SALTED: 2514 break; 2515 default: 2516 (void) fprintf(stderr, 2517 "parse_seckey: bad seckey\n"); 2518 return 0; 2519 } 2520 if (!limread(&c, 1, region, stream)) { 2521 return 0; 2522 } 2523 pkt.u.seckey.hash_alg = (__ops_hash_alg_t)c; 2524 if (pkt.u.seckey.s2k_specifier != OPS_S2KS_SIMPLE && 2525 !limread(pkt.u.seckey.salt, 8, region, stream)) { 2526 return 0; 2527 } 2528 if (pkt.u.seckey.s2k_specifier == 2529 OPS_S2KS_ITERATED_AND_SALTED) { 2530 if (!limread(&c, 1, region, stream)) { 2531 return 0; 2532 } 2533 pkt.u.seckey.octetc = 2534 (16 + ((unsigned)c & 15)) << 2535 (((unsigned)c >> 4) + 6); 2536 } 2537 } else if (pkt.u.seckey.s2k_usage != OPS_S2KU_NONE) { 2538 /* this is V3 style, looks just like a V4 simple hash */ 2539 pkt.u.seckey.alg = (__ops_symm_alg_t)c; 2540 pkt.u.seckey.s2k_usage = OPS_S2KU_ENCRYPTED; 2541 pkt.u.seckey.s2k_specifier = OPS_S2KS_SIMPLE; 2542 pkt.u.seckey.hash_alg = OPS_HASH_MD5; 2543 } 2544 crypted = pkt.u.seckey.s2k_usage == OPS_S2KU_ENCRYPTED || 2545 pkt.u.seckey.s2k_usage == OPS_S2KU_ENCRYPTED_AND_HASHED; 2546 2547 if (crypted) { 2548 __ops_packet_t seckey; 2549 unsigned char key[OPS_MAX_KEY_SIZE + OPS_MAX_HASH_SIZE]; 2550 __ops_hash_t hashes[(OPS_MAX_KEY_SIZE + OPS_MIN_HASH_SIZE - 1) / OPS_MIN_HASH_SIZE]; 2551 size_t passlen; 2552 char *passphrase; 2553 int hashsize; 2554 int keysize; 2555 int n; 2556 2557 blocksize = __ops_block_size(pkt.u.seckey.alg); 2558 if (blocksize == 0 || blocksize > OPS_MAX_BLOCK_SIZE) { 2559 (void) fprintf(stderr, 2560 "parse_seckey: bad blocksize\n"); 2561 return 0; 2562 } 2563 2564 if (!limread(pkt.u.seckey.iv, blocksize, region, stream)) { 2565 return 0; 2566 } 2567 (void) memset(&seckey, 0x0, sizeof(seckey)); 2568 passphrase = NULL; 2569 seckey.u.skey_passphrase.passphrase = &passphrase; 2570 seckey.u.skey_passphrase.seckey = &pkt.u.seckey; 2571 CALLBACK(OPS_GET_PASSPHRASE, &stream->cbinfo, &seckey); 2572 if (!passphrase) { 2573 if (__ops_get_debug_level(__FILE__)) { 2574 /* \todo make into proper error */ 2575 (void) fprintf(stderr, 2576 "parse_seckey: can't get passphrase\n"); 2577 } 2578 if (!consume_packet(region, stream, 0)) { 2579 return 0; 2580 } 2581 2582 CALLBACK(OPS_PTAG_CT_ENCRYPTED_SECRET_KEY, 2583 &stream->cbinfo, &pkt); 2584 2585 return 1; 2586 } 2587 keysize = __ops_key_size(pkt.u.seckey.alg); 2588 if (keysize == 0 || keysize > OPS_MAX_KEY_SIZE) { 2589 (void) fprintf(stderr, 2590 "parse_seckey: bad keysize\n"); 2591 return 0; 2592 } 2593 2594 hashsize = __ops_hash_size(pkt.u.seckey.hash_alg); 2595 if (hashsize == 0 || hashsize > OPS_MAX_HASH_SIZE) { 2596 (void) fprintf(stderr, 2597 "parse_seckey: bad hashsize\n"); 2598 return 0; 2599 } 2600 2601 for (n = 0; n * hashsize < keysize; ++n) { 2602 int i; 2603 2604 __ops_hash_any(&hashes[n], 2605 pkt.u.seckey.hash_alg); 2606 if (!hashes[n].init(&hashes[n])) { 2607 (void) fprintf(stderr, 2608 "parse_seckey: bad alloc\n"); 2609 return 0; 2610 } 2611 /* preload hashes with zeroes... */ 2612 for (i = 0; i < n; ++i) { 2613 hashes[n].add(&hashes[n], 2614 (const unsigned char *) "", 1); 2615 } 2616 } 2617 passlen = strlen(passphrase); 2618 for (n = 0; n * hashsize < keysize; ++n) { 2619 unsigned i; 2620 2621 switch (pkt.u.seckey.s2k_specifier) { 2622 case OPS_S2KS_SALTED: 2623 hashes[n].add(&hashes[n], 2624 pkt.u.seckey.salt, 2625 OPS_SALT_SIZE); 2626 /* FALLTHROUGH */ 2627 case OPS_S2KS_SIMPLE: 2628 hashes[n].add(&hashes[n], 2629 (unsigned char *) passphrase, passlen); 2630 break; 2631 2632 case OPS_S2KS_ITERATED_AND_SALTED: 2633 for (i = 0; i < pkt.u.seckey.octetc; 2634 i += passlen + OPS_SALT_SIZE) { 2635 unsigned j; 2636 2637 j = passlen + OPS_SALT_SIZE; 2638 if (i + j > pkt.u.seckey.octetc && i != 0) { 2639 j = pkt.u.seckey.octetc - i; 2640 } 2641 hashes[n].add(&hashes[n], 2642 pkt.u.seckey.salt, 2643 (unsigned)(j > OPS_SALT_SIZE) ? 2644 OPS_SALT_SIZE : j); 2645 if (j > OPS_SALT_SIZE) { 2646 hashes[n].add(&hashes[n], 2647 (unsigned char *) passphrase, 2648 j - OPS_SALT_SIZE); 2649 } 2650 } 2651 break; 2652 default: 2653 break; 2654 } 2655 } 2656 2657 for (n = 0; n * hashsize < keysize; ++n) { 2658 int r; 2659 2660 r = hashes[n].finish(&hashes[n], key + n * hashsize); 2661 if (r != hashsize) { 2662 (void) fprintf(stderr, 2663 "parse_seckey: bad r\n"); 2664 return 0; 2665 } 2666 } 2667 2668 __ops_forget(passphrase, passlen); 2669 2670 __ops_crypt_any(&decrypt, pkt.u.seckey.alg); 2671 if (__ops_get_debug_level(__FILE__)) { 2672 unsigned i; 2673 2674 fprintf(stderr, "\nREADING:\niv="); 2675 for (i = 0; 2676 i < __ops_block_size(pkt.u.seckey.alg); 2677 i++) { 2678 fprintf(stderr, "%02x ", pkt.u.seckey.iv[i]); 2679 } 2680 fprintf(stderr, "\nkey="); 2681 for (i = 0; i < CAST_KEY_LENGTH; i++) { 2682 fprintf(stderr, "%02x ", key[i]); 2683 } 2684 fprintf(stderr, "\n"); 2685 } 2686 decrypt.set_iv(&decrypt, pkt.u.seckey.iv); 2687 decrypt.set_crypt_key(&decrypt, key); 2688 2689 /* now read encrypted data */ 2690 2691 __ops_reader_push_decrypt(stream, &decrypt, region); 2692 2693 /* 2694 * Since all known encryption for PGP doesn't compress, we 2695 * can limit to the same length as the current region (for 2696 * now). 2697 */ 2698 __ops_init_subregion(&encregion, NULL); 2699 encregion.length = region->length - region->readc; 2700 if (pkt.u.seckey.pubkey.version != OPS_V4) { 2701 encregion.length -= 2; 2702 } 2703 saved_region = region; 2704 region = &encregion; 2705 } 2706 if (pkt.u.seckey.s2k_usage == OPS_S2KU_ENCRYPTED_AND_HASHED) { 2707 pkt.u.seckey.checkhash = calloc(1, OPS_CHECKHASH_SIZE); 2708 if (pkt.u.seckey.checkhash == NULL) { 2709 (void) fprintf(stderr, "parse_seckey: bad alloc\n"); 2710 return 0; 2711 } 2712 __ops_hash_sha1(&checkhash); 2713 __ops_reader_push_hash(stream, &checkhash); 2714 } else { 2715 __ops_reader_push_sum16(stream); 2716 } 2717 2718 switch (pkt.u.seckey.pubkey.alg) { 2719 case OPS_PKA_RSA: 2720 case OPS_PKA_RSA_ENCRYPT_ONLY: 2721 case OPS_PKA_RSA_SIGN_ONLY: 2722 if (!limread_mpi(&pkt.u.seckey.key.rsa.d, region, stream) || 2723 !limread_mpi(&pkt.u.seckey.key.rsa.p, region, stream) || 2724 !limread_mpi(&pkt.u.seckey.key.rsa.q, region, stream) || 2725 !limread_mpi(&pkt.u.seckey.key.rsa.u, region, stream)) { 2726 ret = 0; 2727 } 2728 break; 2729 2730 case OPS_PKA_DSA: 2731 if (!limread_mpi(&pkt.u.seckey.key.dsa.x, region, stream)) { 2732 ret = 0; 2733 } 2734 break; 2735 2736 default: 2737 OPS_ERROR_2(&stream->errors, 2738 OPS_E_ALG_UNSUPPORTED_PUBLIC_KEY_ALG, 2739 "Unsupported Public Key algorithm %d (%s)", 2740 pkt.u.seckey.pubkey.alg, 2741 __ops_show_pka(pkt.u.seckey.pubkey.alg)); 2742 ret = 0; 2743 } 2744 2745 if (__ops_get_debug_level(__FILE__)) { 2746 (void) fprintf(stderr, "4 MPIs read\n"); 2747 } 2748 stream->reading_v3_secret = 0; 2749 2750 if (pkt.u.seckey.s2k_usage == OPS_S2KU_ENCRYPTED_AND_HASHED) { 2751 unsigned char hash[OPS_CHECKHASH_SIZE]; 2752 2753 __ops_reader_pop_hash(stream); 2754 checkhash.finish(&checkhash, hash); 2755 2756 if (crypted && 2757 pkt.u.seckey.pubkey.version != OPS_V4) { 2758 __ops_reader_pop_decrypt(stream); 2759 region = saved_region; 2760 } 2761 if (ret) { 2762 if (!limread(pkt.u.seckey.checkhash, 2763 OPS_CHECKHASH_SIZE, region, stream)) { 2764 return 0; 2765 } 2766 2767 if (memcmp(hash, pkt.u.seckey.checkhash, 2768 OPS_CHECKHASH_SIZE) != 0) { 2769 ERRP(&stream->cbinfo, pkt, 2770 "Hash mismatch in secret key"); 2771 } 2772 } 2773 } else { 2774 unsigned short sum; 2775 2776 sum = __ops_reader_pop_sum16(stream); 2777 if (crypted && 2778 pkt.u.seckey.pubkey.version != OPS_V4) { 2779 __ops_reader_pop_decrypt(stream); 2780 region = saved_region; 2781 } 2782 if (ret) { 2783 if (!limread_scalar(&pkt.u.seckey.checksum, 2, 2784 region, stream)) 2785 return 0; 2786 2787 if (sum != pkt.u.seckey.checksum) { 2788 ERRP(&stream->cbinfo, pkt, 2789 "Checksum mismatch in secret key"); 2790 } 2791 } 2792 } 2793 2794 if (crypted && pkt.u.seckey.pubkey.version == OPS_V4) { 2795 __ops_reader_pop_decrypt(stream); 2796 } 2797 if (region == NULL) { 2798 (void) fprintf(stderr, "parse_seckey: NULL region\n"); 2799 return 0; 2800 } 2801 if (ret && region->readc != region->length) { 2802 (void) fprintf(stderr, "parse_seckey: bad length\n"); 2803 return 0; 2804 } 2805 if (!ret) { 2806 return 0; 2807 } 2808 CALLBACK(OPS_PTAG_CT_SECRET_KEY, &stream->cbinfo, &pkt); 2809 if (__ops_get_debug_level(__FILE__)) { 2810 (void) fprintf(stderr, "--- end of parse_seckey\n\n"); 2811 } 2812 return 1; 2813 } 2814 2815 /** 2816 \ingroup Core_ReadPackets 2817 \brief Parse a Public Key Session Key packet 2818 */ 2819 static int 2820 parse_pk_sesskey(__ops_region_t *region, 2821 __ops_stream_t *stream) 2822 { 2823 const __ops_seckey_t *secret; 2824 __ops_packet_t sesskey; 2825 __ops_packet_t pkt; 2826 unsigned char *iv; 2827 unsigned char c = 0x0; 2828 unsigned char cs[2]; 2829 unsigned k; 2830 BIGNUM *enc_m; 2831 int n; 2832 2833 /* Can't rely on it being CAST5 */ 2834 /* \todo FIXME RW */ 2835 /* const size_t sz_unencoded_m_buf=CAST_KEY_LENGTH+1+2; */ 2836 unsigned char unencoded_m_buf[1024]; 2837 2838 if (!limread(&c, 1, region, stream)) { 2839 return 0; 2840 } 2841 pkt.u.pk_sesskey.version = (__ops_pk_sesskey_version_t)c; 2842 if (pkt.u.pk_sesskey.version != OPS_PKSK_V3) { 2843 OPS_ERROR_1(&stream->errors, OPS_E_PROTO_BAD_PKSK_VRSN, 2844 "Bad public-key encrypted session key version (%d)", 2845 pkt.u.pk_sesskey.version); 2846 return 0; 2847 } 2848 if (!limread(pkt.u.pk_sesskey.key_id, 2849 sizeof(pkt.u.pk_sesskey.key_id), region, stream)) { 2850 return 0; 2851 } 2852 if (__ops_get_debug_level(__FILE__)) { 2853 int i; 2854 int x = sizeof(pkt.u.pk_sesskey.key_id); 2855 2856 printf("session key: public key id: x=%d\n", x); 2857 for (i = 0; i < x; i++) { 2858 printf("%2x ", pkt.u.pk_sesskey.key_id[i]); 2859 } 2860 printf("\n"); 2861 } 2862 if (!limread(&c, 1, region, stream)) { 2863 return 0; 2864 } 2865 pkt.u.pk_sesskey.alg = (__ops_pubkey_alg_t)c; 2866 switch (pkt.u.pk_sesskey.alg) { 2867 case OPS_PKA_RSA: 2868 if (!limread_mpi(&pkt.u.pk_sesskey.params.rsa.encrypted_m, 2869 region, stream)) { 2870 return 0; 2871 } 2872 enc_m = pkt.u.pk_sesskey.params.rsa.encrypted_m; 2873 break; 2874 2875 case OPS_PKA_ELGAMAL: 2876 if (!limread_mpi(&pkt.u.pk_sesskey.params.elgamal.g_to_k, 2877 region, stream) || 2878 !limread_mpi( 2879 &pkt.u.pk_sesskey.params.elgamal.encrypted_m, 2880 region, stream)) { 2881 return 0; 2882 } 2883 enc_m = pkt.u.pk_sesskey.params.elgamal.encrypted_m; 2884 break; 2885 2886 default: 2887 OPS_ERROR_1(&stream->errors, 2888 OPS_E_ALG_UNSUPPORTED_PUBLIC_KEY_ALG, 2889 "Unknown public key algorithm in session key (%s)", 2890 __ops_show_pka(pkt.u.pk_sesskey.alg)); 2891 return 0; 2892 } 2893 2894 (void) memset(&sesskey, 0x0, sizeof(sesskey)); 2895 secret = NULL; 2896 sesskey.u.get_seckey.seckey = &secret; 2897 sesskey.u.get_seckey.pk_sesskey = &pkt.u.pk_sesskey; 2898 2899 CALLBACK(OPS_GET_SECKEY, &stream->cbinfo, &sesskey); 2900 2901 if (!secret) { 2902 CALLBACK(OPS_PTAG_CT_ENCRYPTED_PK_SESSION_KEY, &stream->cbinfo, 2903 &pkt); 2904 return 1; 2905 } 2906 n = __ops_decrypt_decode_mpi(unencoded_m_buf, sizeof(unencoded_m_buf), 2907 enc_m, secret); 2908 if (n < 1) { 2909 ERRP(&stream->cbinfo, pkt, "decrypted message too short"); 2910 return 0; 2911 } 2912 2913 /* PKA */ 2914 pkt.u.pk_sesskey.symm_alg = (__ops_symm_alg_t)unencoded_m_buf[0]; 2915 2916 if (!__ops_is_sa_supported(pkt.u.pk_sesskey.symm_alg)) { 2917 /* ERR1P */ 2918 OPS_ERROR_1(&stream->errors, OPS_E_ALG_UNSUPPORTED_SYMMETRIC_ALG, 2919 "Symmetric algorithm %s not supported", 2920 __ops_show_symm_alg( 2921 pkt.u.pk_sesskey.symm_alg)); 2922 return 0; 2923 } 2924 k = __ops_key_size(pkt.u.pk_sesskey.symm_alg); 2925 2926 if ((unsigned) n != k + 3) { 2927 OPS_ERROR_2(&stream->errors, OPS_E_PROTO_DECRYPTED_MSG_WRONG_LEN, 2928 "decrypted message wrong length (got %d expected %d)", 2929 n, k + 3); 2930 return 0; 2931 } 2932 if (k > sizeof(pkt.u.pk_sesskey.key)) { 2933 (void) fprintf(stderr, "parse_pk_sesskey: bad keylength\n"); 2934 return 0; 2935 } 2936 2937 (void) memcpy(pkt.u.pk_sesskey.key, unencoded_m_buf + 1, k); 2938 2939 if (__ops_get_debug_level(__FILE__)) { 2940 unsigned int j; 2941 printf("session key recovered (len=%u):\n", k); 2942 for (j = 0; j < k; j++) 2943 printf("%2x ", pkt.u.pk_sesskey.key[j]); 2944 printf("\n"); 2945 } 2946 pkt.u.pk_sesskey.checksum = unencoded_m_buf[k + 1] + 2947 (unencoded_m_buf[k + 2] << 8); 2948 if (__ops_get_debug_level(__FILE__)) { 2949 printf("session key checksum: %2x %2x\n", 2950 unencoded_m_buf[k + 1], unencoded_m_buf[k + 2]); 2951 } 2952 2953 /* Check checksum */ 2954 __ops_calc_sesskey_checksum(&pkt.u.pk_sesskey, &cs[0]); 2955 if (unencoded_m_buf[k + 1] != cs[0] || 2956 unencoded_m_buf[k + 2] != cs[1]) { 2957 OPS_ERROR_4(&stream->errors, OPS_E_PROTO_BAD_SK_CHECKSUM, 2958 "Session key checksum wrong: expected %2x %2x, got %2x %2x", 2959 cs[0], cs[1], unencoded_m_buf[k + 1], 2960 unencoded_m_buf[k + 2]); 2961 return 0; 2962 } 2963 /* all is well */ 2964 CALLBACK(OPS_PTAG_CT_PK_SESSION_KEY, &stream->cbinfo, &pkt); 2965 2966 __ops_crypt_any(&stream->decrypt, pkt.u.pk_sesskey.symm_alg); 2967 iv = calloc(1, stream->decrypt.blocksize); 2968 if (iv == NULL) { 2969 (void) fprintf(stderr, "parse_pk_sesskey: bad alloc\n"); 2970 return 0; 2971 } 2972 stream->decrypt.set_iv(&stream->decrypt, iv); 2973 stream->decrypt.set_crypt_key(&stream->decrypt, pkt.u.pk_sesskey.key); 2974 __ops_encrypt_init(&stream->decrypt); 2975 free(iv); 2976 return 1; 2977 } 2978 2979 static int 2980 __ops_decrypt_se_data(__ops_content_tag_t tag, __ops_region_t *region, 2981 __ops_stream_t *stream) 2982 { 2983 __ops_crypt_t *decrypt; 2984 const int printerrors = 1; 2985 int r = 1; 2986 2987 decrypt = __ops_get_decrypt(stream); 2988 if (decrypt) { 2989 unsigned char buf[OPS_MAX_BLOCK_SIZE + 2] = ""; 2990 size_t b = decrypt->blocksize; 2991 /* __ops_packet_t pkt; */ 2992 __ops_region_t encregion; 2993 2994 2995 __ops_reader_push_decrypt(stream, decrypt, region); 2996 2997 __ops_init_subregion(&encregion, NULL); 2998 encregion.length = b + 2; 2999 3000 if (!exact_limread(buf, b + 2, &encregion, stream)) { 3001 return 0; 3002 } 3003 if (buf[b - 2] != buf[b] || buf[b - 1] != buf[b + 1]) { 3004 __ops_reader_pop_decrypt(stream); 3005 OPS_ERROR_4(&stream->errors, 3006 OPS_E_PROTO_BAD_SYMMETRIC_DECRYPT, 3007 "Bad symmetric decrypt (%02x%02x vs %02x%02x)", 3008 buf[b - 2], buf[b - 1], buf[b], buf[b + 1]); 3009 return 0; 3010 } 3011 if (tag == OPS_PTAG_CT_SE_DATA_BODY) { 3012 decrypt->decrypt_resync(decrypt); 3013 decrypt->block_encrypt(decrypt, decrypt->civ, 3014 decrypt->civ); 3015 } 3016 r = __ops_parse(stream, !printerrors); 3017 3018 __ops_reader_pop_decrypt(stream); 3019 } else { 3020 __ops_packet_t pkt; 3021 3022 while (region->readc < region->length) { 3023 unsigned len; 3024 3025 len = region->length - region->readc; 3026 if (len > sizeof(pkt.u.se_data_body.data)) 3027 len = sizeof(pkt.u.se_data_body.data); 3028 3029 if (!limread(pkt.u.se_data_body.data, len, 3030 region, stream)) { 3031 return 0; 3032 } 3033 pkt.u.se_data_body.length = len; 3034 CALLBACK(tag, &stream->cbinfo, &pkt); 3035 } 3036 } 3037 3038 return r; 3039 } 3040 3041 static int 3042 __ops_decrypt_se_ip_data(__ops_content_tag_t tag, __ops_region_t *region, 3043 __ops_stream_t *stream) 3044 { 3045 __ops_crypt_t *decrypt; 3046 const int printerrors = 1; 3047 int r = 1; 3048 3049 decrypt = __ops_get_decrypt(stream); 3050 if (decrypt) { 3051 __ops_reader_push_decrypt(stream, decrypt, region); 3052 __ops_reader_push_se_ip_data(stream, decrypt, region); 3053 3054 r = __ops_parse(stream, !printerrors); 3055 3056 __ops_reader_pop_se_ip_data(stream); 3057 __ops_reader_pop_decrypt(stream); 3058 } else { 3059 __ops_packet_t pkt; 3060 3061 while (region->readc < region->length) { 3062 unsigned len; 3063 3064 len = region->length - region->readc; 3065 if (len > sizeof(pkt.u.se_data_body.data)) { 3066 len = sizeof(pkt.u.se_data_body.data); 3067 } 3068 3069 if (!limread(pkt.u.se_data_body.data, 3070 len, region, stream)) { 3071 return 0; 3072 } 3073 3074 pkt.u.se_data_body.length = len; 3075 3076 CALLBACK(tag, &stream->cbinfo, &pkt); 3077 } 3078 } 3079 3080 return r; 3081 } 3082 3083 /** 3084 \ingroup Core_ReadPackets 3085 \brief Read a Symmetrically Encrypted packet 3086 */ 3087 static int 3088 parse_se_data(__ops_region_t *region, __ops_stream_t *stream) 3089 { 3090 __ops_packet_t pkt; 3091 3092 /* there's no info to go with this, so just announce it */ 3093 CALLBACK(OPS_PTAG_CT_SE_DATA_HEADER, &stream->cbinfo, &pkt); 3094 3095 /* 3096 * The content of an encrypted data packet is more OpenPGP packets 3097 * once decrypted, so recursively handle them 3098 */ 3099 return __ops_decrypt_se_data(OPS_PTAG_CT_SE_DATA_BODY, region, stream); 3100 } 3101 3102 /** 3103 \ingroup Core_ReadPackets 3104 \brief Read a Symmetrically Encrypted Integrity Protected packet 3105 */ 3106 static int 3107 parse_se_ip_data(__ops_region_t *region, __ops_stream_t *stream) 3108 { 3109 __ops_packet_t pkt; 3110 unsigned char c = 0x0; 3111 3112 if (!limread(&c, 1, region, stream)) { 3113 return 0; 3114 } 3115 pkt.u.se_ip_data_header.version = (__ops_se_ip_version_t)c; 3116 3117 if (pkt.u.se_ip_data_header.version != OPS_SE_IP_V1) { 3118 (void) fprintf(stderr, "parse_se_ip_data: bad version\n"); 3119 return 0; 3120 } 3121 3122 /* 3123 * The content of an encrypted data packet is more OpenPGP packets 3124 * once decrypted, so recursively handle them 3125 */ 3126 return __ops_decrypt_se_ip_data(OPS_PTAG_CT_SE_IP_DATA_BODY, region, 3127 stream); 3128 } 3129 3130 /** 3131 \ingroup Core_ReadPackets 3132 \brief Read a MDC packet 3133 */ 3134 static int 3135 parse_mdc(__ops_region_t *region, __ops_stream_t *stream) 3136 { 3137 __ops_packet_t pkt; 3138 3139 pkt.u.mdc.length = OPS_SHA1_HASH_SIZE; 3140 if ((pkt.u.mdc.data = calloc(1, OPS_SHA1_HASH_SIZE)) == NULL) { 3141 (void) fprintf(stderr, "parse_mdc: bad alloc\n"); 3142 return 0; 3143 } 3144 if (!limread(pkt.u.mdc.data, OPS_SHA1_HASH_SIZE, region, stream)) { 3145 return 0; 3146 } 3147 CALLBACK(OPS_PTAG_CT_MDC, &stream->cbinfo, &pkt); 3148 free(pkt.u.mdc.data); 3149 return 1; 3150 } 3151 3152 /** 3153 * \ingroup Core_ReadPackets 3154 * \brief Parse one packet. 3155 * 3156 * This function parses the packet tag. It computes the value of the 3157 * content tag and then calls the appropriate function to handle the 3158 * content. 3159 * 3160 * \param *stream How to parse 3161 * \param *pktlen On return, will contain number of bytes in packet 3162 * \return 1 on success, 0 on error, -1 on EOF */ 3163 static int 3164 __ops_parse_packet(__ops_stream_t *stream, unsigned long *pktlen) 3165 { 3166 __ops_packet_t pkt; 3167 __ops_region_t region; 3168 unsigned char ptag; 3169 unsigned indeterminate = 0; 3170 int ret; 3171 3172 pkt.u.ptag.position = stream->readinfo.position; 3173 3174 ret = base_read(&ptag, 1, stream); 3175 3176 if (__ops_get_debug_level(__FILE__)) { 3177 (void) fprintf(stderr, 3178 "__ops_parse_packet: base_read returned %d\n", 3179 ret); 3180 } 3181 3182 /* errors in the base read are effectively EOF. */ 3183 if (ret <= 0) { 3184 return -1; 3185 } 3186 3187 *pktlen = 0; 3188 3189 if (!(ptag & OPS_PTAG_ALWAYS_SET)) { 3190 pkt.u.error.error = "Format error (ptag bit not set)"; 3191 CALLBACK(OPS_PARSER_ERROR, &stream->cbinfo, &pkt); 3192 return 0; 3193 } 3194 pkt.u.ptag.new_format = !!(ptag & OPS_PTAG_NEW_FORMAT); 3195 if (pkt.u.ptag.new_format) { 3196 pkt.u.ptag.type = (ptag & OPS_PTAG_NF_CONTENT_TAG_MASK); 3197 pkt.u.ptag.length_type = 0; 3198 if (!read_new_length(&pkt.u.ptag.length, stream)) { 3199 return 0; 3200 } 3201 } else { 3202 unsigned rb; 3203 3204 rb = 0; 3205 pkt.u.ptag.type = ((unsigned)ptag & 3206 OPS_PTAG_OF_CONTENT_TAG_MASK) 3207 >> OPS_PTAG_OF_CONTENT_TAG_SHIFT; 3208 pkt.u.ptag.length_type = ptag & OPS_PTAG_OF_LENGTH_TYPE_MASK; 3209 switch (pkt.u.ptag.length_type) { 3210 case OPS_PTAG_OLD_LEN_1: 3211 rb = _read_scalar(&pkt.u.ptag.length, 1, stream); 3212 break; 3213 3214 case OPS_PTAG_OLD_LEN_2: 3215 rb = _read_scalar(&pkt.u.ptag.length, 2, stream); 3216 break; 3217 3218 case OPS_PTAG_OLD_LEN_4: 3219 rb = _read_scalar(&pkt.u.ptag.length, 4, stream); 3220 break; 3221 3222 case OPS_PTAG_OLD_LEN_INDETERMINATE: 3223 pkt.u.ptag.length = 0; 3224 indeterminate = 1; 3225 rb = 1; 3226 break; 3227 } 3228 if (!rb) { 3229 return 0; 3230 } 3231 } 3232 3233 CALLBACK(OPS_PARSER_PTAG, &stream->cbinfo, &pkt); 3234 3235 __ops_init_subregion(®ion, NULL); 3236 region.length = pkt.u.ptag.length; 3237 region.indeterminate = indeterminate; 3238 if (__ops_get_debug_level(__FILE__)) { 3239 (void) fprintf(stderr, "__ops_parse_packet: type %u\n", 3240 pkt.u.ptag.type); 3241 } 3242 switch (pkt.u.ptag.type) { 3243 case OPS_PTAG_CT_SIGNATURE: 3244 ret = parse_sig(®ion, stream); 3245 break; 3246 3247 case OPS_PTAG_CT_PUBLIC_KEY: 3248 case OPS_PTAG_CT_PUBLIC_SUBKEY: 3249 ret = parse_pubkey(pkt.u.ptag.type, ®ion, stream); 3250 break; 3251 3252 case OPS_PTAG_CT_TRUST: 3253 ret = parse_trust(®ion, stream); 3254 break; 3255 3256 case OPS_PTAG_CT_USER_ID: 3257 ret = parse_userid(®ion, stream); 3258 break; 3259 3260 case OPS_PTAG_CT_COMPRESSED: 3261 ret = parse_compressed(®ion, stream); 3262 break; 3263 3264 case OPS_PTAG_CT_1_PASS_SIG: 3265 ret = parse_one_pass(®ion, stream); 3266 break; 3267 3268 case OPS_PTAG_CT_LITDATA: 3269 ret = parse_litdata(®ion, stream); 3270 break; 3271 3272 case OPS_PTAG_CT_USER_ATTR: 3273 ret = parse_userattr(®ion, stream); 3274 break; 3275 3276 case OPS_PTAG_CT_SECRET_KEY: 3277 ret = parse_seckey(®ion, stream); 3278 break; 3279 3280 case OPS_PTAG_CT_SECRET_SUBKEY: 3281 ret = parse_seckey(®ion, stream); 3282 break; 3283 3284 case OPS_PTAG_CT_PK_SESSION_KEY: 3285 ret = parse_pk_sesskey(®ion, stream); 3286 break; 3287 3288 case OPS_PTAG_CT_SE_DATA: 3289 ret = parse_se_data(®ion, stream); 3290 break; 3291 3292 case OPS_PTAG_CT_SE_IP_DATA: 3293 ret = parse_se_ip_data(®ion, stream); 3294 break; 3295 3296 case OPS_PTAG_CT_MDC: 3297 ret = parse_mdc(®ion, stream); 3298 break; 3299 3300 default: 3301 OPS_ERROR_1(&stream->errors, OPS_E_P_UNKNOWN_TAG, 3302 "Unknown content tag 0x%x", 3303 pkt.u.ptag.type); 3304 ret = 0; 3305 } 3306 3307 /* Ensure that the entire packet has been consumed */ 3308 3309 if (region.length != region.readc && !region.indeterminate) { 3310 if (!consume_packet(®ion, stream, 0)) { 3311 ret = -1; 3312 } 3313 } 3314 3315 /* also consume it if there's been an error? */ 3316 /* \todo decide what to do about an error on an */ 3317 /* indeterminate packet */ 3318 if (ret == 0) { 3319 if (!consume_packet(®ion, stream, 0)) { 3320 ret = -1; 3321 } 3322 } 3323 /* set pktlen */ 3324 3325 *pktlen = stream->readinfo.alength; 3326 3327 /* do callback on entire packet, if desired and there was no error */ 3328 3329 if (ret > 0 && stream->readinfo.accumulate) { 3330 pkt.u.packet.length = stream->readinfo.alength; 3331 pkt.u.packet.raw = stream->readinfo.accumulated; 3332 stream->readinfo.accumulated = NULL; 3333 stream->readinfo.asize = 0; 3334 CALLBACK(OPS_PARSER_PACKET_END, &stream->cbinfo, &pkt); 3335 } 3336 stream->readinfo.alength = 0; 3337 3338 return (ret < 0) ? -1 : (ret) ? 1 : 0; 3339 } 3340 3341 /** 3342 * \ingroup Core_ReadPackets 3343 * 3344 * \brief Parse packets from an input stream until EOF or error. 3345 * 3346 * \details Setup the necessary parsing configuration in "stream" 3347 * before calling __ops_parse(). 3348 * 3349 * That information includes : 3350 * 3351 * - a "reader" function to be used to get the data to be parsed 3352 * 3353 * - a "callback" function to be called when this library has identified 3354 * a parseable object within the data 3355 * 3356 * - whether the calling function wants the signature subpackets 3357 * returned raw, parsed or not at all. 3358 * 3359 * After returning, stream->errors holds any errors encountered while parsing. 3360 * 3361 * \param stream Parsing configuration 3362 * \return 1 on success in all packets, 0 on error in any packet 3363 * 3364 * \sa CoreAPI Overview 3365 * 3366 * \sa __ops_print_errors() 3367 * 3368 */ 3369 3370 int 3371 __ops_parse(__ops_stream_t *stream, const int perrors) 3372 { 3373 unsigned long pktlen; 3374 int r; 3375 3376 do { 3377 r = __ops_parse_packet(stream, &pktlen); 3378 } while (r != -1); 3379 if (perrors) { 3380 __ops_print_errors(stream->errors); 3381 } 3382 return (stream->errors == NULL); 3383 } 3384 3385 /** 3386 * \ingroup Core_ReadPackets 3387 * 3388 * \brief Specifies whether one or more signature 3389 * subpacket types should be returned parsed; or raw; or ignored. 3390 * 3391 * \param stream Pointer to previously allocated structure 3392 * \param tag Packet tag. OPS_PTAG_SS_ALL for all SS tags; or one individual signature subpacket tag 3393 * \param type Parse type 3394 * \todo Make all packet types optional, not just subpackets */ 3395 void 3396 __ops_parse_options(__ops_stream_t *stream, 3397 __ops_content_tag_t tag, 3398 __ops_parse_type_t type) 3399 { 3400 unsigned t7; 3401 unsigned t8; 3402 3403 if (tag == OPS_PTAG_SS_ALL) { 3404 int n; 3405 3406 for (n = 0; n < 256; ++n) { 3407 __ops_parse_options(stream, 3408 OPS_PTAG_SIG_SUBPKT_BASE + n, 3409 type); 3410 } 3411 return; 3412 } 3413 if (tag < OPS_PTAG_SIG_SUBPKT_BASE || 3414 tag > OPS_PTAG_SIG_SUBPKT_BASE + NTAGS - 1) { 3415 (void) fprintf(stderr, "__ops_parse_options: bad tag\n"); 3416 return; 3417 } 3418 t8 = (tag - OPS_PTAG_SIG_SUBPKT_BASE) / 8; 3419 t7 = 1 << ((tag - OPS_PTAG_SIG_SUBPKT_BASE) & 7); 3420 switch (type) { 3421 case OPS_PARSE_RAW: 3422 stream->ss_raw[t8] |= t7; 3423 stream->ss_parsed[t8] &= ~t7; 3424 break; 3425 3426 case OPS_PARSE_PARSED: 3427 stream->ss_raw[t8] &= ~t7; 3428 stream->ss_parsed[t8] |= t7; 3429 break; 3430 3431 case OPS_PARSE_IGNORE: 3432 stream->ss_raw[t8] &= ~t7; 3433 stream->ss_parsed[t8] &= ~t7; 3434 break; 3435 } 3436 } 3437 3438 /** 3439 \ingroup Core_ReadPackets 3440 \brief Free __ops_stream_t struct and its contents 3441 */ 3442 void 3443 __ops_stream_delete(__ops_stream_t *stream) 3444 { 3445 __ops_cbdata_t *cbinfo; 3446 __ops_cbdata_t *next; 3447 3448 for (cbinfo = stream->cbinfo.next; cbinfo; cbinfo = next) { 3449 next = cbinfo->next; 3450 free(cbinfo); 3451 } 3452 if (stream->readinfo.destroyer) { 3453 stream->readinfo.destroyer(&stream->readinfo); 3454 } 3455 __ops_free_errors(stream->errors); 3456 if (stream->readinfo.accumulated) { 3457 free(stream->readinfo.accumulated); 3458 } 3459 free(stream); 3460 } 3461 3462 /** 3463 \ingroup Core_ReadPackets 3464 \brief Returns the parse_info's reader_info 3465 \return Pointer to the reader_info inside the parse_info 3466 */ 3467 __ops_reader_t * 3468 __ops_readinfo(__ops_stream_t *stream) 3469 { 3470 return &stream->readinfo; 3471 } 3472 3473 /** 3474 \ingroup Core_ReadPackets 3475 \brief Sets the parse_info's callback 3476 This is used when adding the first callback in a stack of callbacks. 3477 \sa __ops_callback_push() 3478 */ 3479 3480 void 3481 __ops_set_callback(__ops_stream_t *stream, __ops_cbfunc_t *cb, void *arg) 3482 { 3483 stream->cbinfo.cbfunc = cb; 3484 stream->cbinfo.arg = arg; 3485 stream->cbinfo.errors = &stream->errors; 3486 } 3487 3488 /** 3489 \ingroup Core_ReadPackets 3490 \brief Adds a further callback to a stack of callbacks 3491 \sa __ops_set_callback() 3492 */ 3493 void 3494 __ops_callback_push(__ops_stream_t *stream, __ops_cbfunc_t *cb, void *arg) 3495 { 3496 __ops_cbdata_t *cbinfo; 3497 3498 if ((cbinfo = calloc(1, sizeof(*cbinfo))) == NULL) { 3499 (void) fprintf(stderr, "__ops_callback_push: bad alloc\n"); 3500 return; 3501 } 3502 (void) memcpy(cbinfo, &stream->cbinfo, sizeof(*cbinfo)); 3503 cbinfo->io = stream->io; 3504 stream->cbinfo.next = cbinfo; 3505 __ops_set_callback(stream, cb, arg); 3506 } 3507 3508 /** 3509 \ingroup Core_ReadPackets 3510 \brief Returns callback's arg 3511 */ 3512 void * 3513 __ops_callback_arg(__ops_cbdata_t *cbinfo) 3514 { 3515 return cbinfo->arg; 3516 } 3517 3518 /** 3519 \ingroup Core_ReadPackets 3520 \brief Returns callback's errors 3521 */ 3522 void * 3523 __ops_callback_errors(__ops_cbdata_t *cbinfo) 3524 { 3525 return cbinfo->errors; 3526 } 3527 3528 /** 3529 \ingroup Core_ReadPackets 3530 \brief Calls the parse_cb_info's callback if present 3531 \return Return value from callback, if present; else OPS_FINISHED 3532 */ 3533 __ops_cb_ret_t 3534 __ops_callback(const __ops_packet_t *pkt, __ops_cbdata_t *cbinfo) 3535 { 3536 return (cbinfo->cbfunc) ? cbinfo->cbfunc(pkt, cbinfo) : OPS_FINISHED; 3537 } 3538 3539 /** 3540 \ingroup Core_ReadPackets 3541 \brief Calls the next callback in the stack 3542 \return Return value from callback 3543 */ 3544 __ops_cb_ret_t 3545 __ops_stacked_callback(const __ops_packet_t *pkt, __ops_cbdata_t *cbinfo) 3546 { 3547 return __ops_callback(pkt, cbinfo->next); 3548 } 3549 3550 /** 3551 \ingroup Core_ReadPackets 3552 \brief Returns the parse_info's errors 3553 \return parse_info's errors 3554 */ 3555 __ops_error_t * 3556 __ops_stream_get_errors(__ops_stream_t *stream) 3557 { 3558 return stream->errors; 3559 } 3560 3561 __ops_crypt_t * 3562 __ops_get_decrypt(__ops_stream_t *stream) 3563 { 3564 return (stream->decrypt.alg) ? &stream->decrypt : NULL; 3565 } 3566