Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* ocsp_ht.c */ |
| 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
| 3 | * project 2006. |
| 4 | */ |
| 5 | /* ==================================================================== |
| 6 | * Copyright (c) 2006 The OpenSSL Project. All rights reserved. |
| 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 | * |
| 12 | * 1. Redistributions of source code must retain the above copyright |
| 13 | * notice, this list of conditions and the following disclaimer. |
| 14 | * |
| 15 | * 2. Redistributions in binary form must reproduce the above copyright |
| 16 | * notice, this list of conditions and the following disclaimer in |
| 17 | * the documentation and/or other materials provided with the |
| 18 | * distribution. |
| 19 | * |
| 20 | * 3. All advertising materials mentioning features or use of this |
| 21 | * software must display the following acknowledgment: |
| 22 | * "This product includes software developed by the OpenSSL Project |
| 23 | * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)" |
| 24 | * |
| 25 | * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to |
| 26 | * endorse or promote products derived from this software without |
| 27 | * prior written permission. For written permission, please contact |
| 28 | * licensing@OpenSSL.org. |
| 29 | * |
| 30 | * 5. Products derived from this software may not be called "OpenSSL" |
| 31 | * nor may "OpenSSL" appear in their names without prior written |
| 32 | * permission of the OpenSSL Project. |
| 33 | * |
| 34 | * 6. Redistributions of any form whatsoever must retain the following |
| 35 | * acknowledgment: |
| 36 | * "This product includes software developed by the OpenSSL Project |
| 37 | * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)" |
| 38 | * |
| 39 | * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY |
| 40 | * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 41 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| 42 | * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR |
| 43 | * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
| 45 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; |
| 46 | * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 47 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, |
| 48 | * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| 49 | * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED |
| 50 | * OF THE POSSIBILITY OF SUCH DAMAGE. |
| 51 | * ==================================================================== |
| 52 | * |
| 53 | * This product includes cryptographic software written by Eric Young |
| 54 | * (eay@cryptsoft.com). This product includes software written by Tim |
| 55 | * Hudson (tjh@cryptsoft.com). |
| 56 | * |
| 57 | */ |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include <stdlib.h> |
| 61 | #include <ctype.h> |
| 62 | #include <string.h> |
| 63 | #include "e_os.h" |
| 64 | #include <openssl/asn1.h> |
| 65 | #include <openssl/ocsp.h> |
| 66 | #include <openssl/err.h> |
| 67 | #include <openssl/buffer.h> |
| 68 | #ifdef OPENSSL_SYS_SUNOS |
| 69 | #define strtoul (unsigned long)strtol |
| 70 | #endif /* OPENSSL_SYS_SUNOS */ |
| 71 | |
| 72 | /* Stateful OCSP request code, supporting non-blocking I/O */ |
| 73 | |
| 74 | /* Opaque OCSP request status structure */ |
| 75 | |
| 76 | struct ocsp_req_ctx_st { |
| 77 | int state; /* Current I/O state */ |
| 78 | unsigned char *iobuf; /* Line buffer */ |
| 79 | int iobuflen; /* Line buffer length */ |
| 80 | BIO *io; /* BIO to perform I/O with */ |
| 81 | BIO *mem; /* Memory BIO response is built into */ |
| 82 | unsigned long asn1_len; /* ASN1 length of response */ |
| 83 | }; |
| 84 | |
| 85 | #define OCSP_MAX_REQUEST_LENGTH (100 * 1024) |
| 86 | #define OCSP_MAX_LINE_LEN 4096; |
| 87 | |
| 88 | /* OCSP states */ |
| 89 | |
| 90 | /* If set no reading should be performed */ |
| 91 | #define OHS_NOREAD 0x1000 |
| 92 | /* Error condition */ |
| 93 | #define OHS_ERROR (0 | OHS_NOREAD) |
| 94 | /* First line being read */ |
| 95 | #define OHS_FIRSTLINE 1 |
| 96 | /* MIME headers being read */ |
| 97 | #define OHS_HEADERS 2 |
| 98 | /* OCSP initial header (tag + length) being read */ |
| 99 | #define OHS_ASN1_HEADER 3 |
| 100 | /* OCSP content octets being read */ |
| 101 | #define OHS_ASN1_CONTENT 4 |
| 102 | /* Request being sent */ |
| 103 | #define OHS_ASN1_WRITE (6 | OHS_NOREAD) |
| 104 | /* Request being flushed */ |
| 105 | #define OHS_ASN1_FLUSH (7 | OHS_NOREAD) |
| 106 | /* Completed */ |
| 107 | #define OHS_DONE (8 | OHS_NOREAD) |
| 108 | |
| 109 | |
| 110 | static int parse_http_line1(char *line); |
| 111 | |
| 112 | void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx) |
| 113 | { |
| 114 | if (rctx->mem) |
| 115 | BIO_free(rctx->mem); |
| 116 | if (rctx->iobuf) |
| 117 | OPENSSL_free(rctx->iobuf); |
| 118 | OPENSSL_free(rctx); |
| 119 | } |
| 120 | |
| 121 | int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req) |
| 122 | { |
| 123 | static const char req_hdr[] = |
| 124 | "Content-Type: application/ocsp-request\r\n" |
| 125 | "Content-Length: %d\r\n\r\n"; |
| 126 | if (BIO_printf(rctx->mem, req_hdr, i2d_OCSP_REQUEST(req, NULL)) <= 0) |
| 127 | return 0; |
| 128 | if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0) |
| 129 | return 0; |
| 130 | rctx->state = OHS_ASN1_WRITE; |
| 131 | rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL); |
| 132 | return 1; |
| 133 | } |
| 134 | |
| 135 | int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx, |
| 136 | const char *name, const char *value) |
| 137 | { |
| 138 | if (!name) |
| 139 | return 0; |
| 140 | if (BIO_puts(rctx->mem, name) <= 0) |
| 141 | return 0; |
| 142 | if (value) |
| 143 | { |
| 144 | if (BIO_write(rctx->mem, ": ", 2) != 2) |
| 145 | return 0; |
| 146 | if (BIO_puts(rctx->mem, value) <= 0) |
| 147 | return 0; |
| 148 | } |
| 149 | if (BIO_write(rctx->mem, "\r\n", 2) != 2) |
| 150 | return 0; |
| 151 | return 1; |
| 152 | } |
| 153 | |
| 154 | OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req, |
| 155 | int maxline) |
| 156 | { |
| 157 | static const char post_hdr[] = "POST %s HTTP/1.0\r\n"; |
| 158 | |
| 159 | OCSP_REQ_CTX *rctx; |
| 160 | rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX)); |
| 161 | rctx->state = OHS_ERROR; |
| 162 | rctx->mem = BIO_new(BIO_s_mem()); |
| 163 | rctx->io = io; |
| 164 | rctx->asn1_len = 0; |
| 165 | if (maxline > 0) |
| 166 | rctx->iobuflen = maxline; |
| 167 | else |
| 168 | rctx->iobuflen = OCSP_MAX_LINE_LEN; |
| 169 | rctx->iobuf = OPENSSL_malloc(rctx->iobuflen); |
| 170 | if (!rctx->iobuf) |
| 171 | return 0; |
| 172 | if (!path) |
| 173 | path = "/"; |
| 174 | |
| 175 | if (BIO_printf(rctx->mem, post_hdr, path) <= 0) |
| 176 | return 0; |
| 177 | |
| 178 | if (req && !OCSP_REQ_CTX_set1_req(rctx, req)) |
| 179 | return 0; |
| 180 | |
| 181 | return rctx; |
| 182 | } |
| 183 | |
| 184 | /* Parse the HTTP response. This will look like this: |
| 185 | * "HTTP/1.0 200 OK". We need to obtain the numeric code and |
| 186 | * (optional) informational message. |
| 187 | */ |
| 188 | |
| 189 | static int parse_http_line1(char *line) |
| 190 | { |
| 191 | int retcode; |
| 192 | char *p, *q, *r; |
| 193 | /* Skip to first white space (passed protocol info) */ |
| 194 | |
| 195 | for(p = line; *p && !isspace((unsigned char)*p); p++) |
| 196 | continue; |
| 197 | if(!*p) |
| 198 | { |
| 199 | OCSPerr(OCSP_F_PARSE_HTTP_LINE1, |
| 200 | OCSP_R_SERVER_RESPONSE_PARSE_ERROR); |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /* Skip past white space to start of response code */ |
| 205 | while(*p && isspace((unsigned char)*p)) |
| 206 | p++; |
| 207 | |
| 208 | if(!*p) |
| 209 | { |
| 210 | OCSPerr(OCSP_F_PARSE_HTTP_LINE1, |
| 211 | OCSP_R_SERVER_RESPONSE_PARSE_ERROR); |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* Find end of response code: first whitespace after start of code */ |
| 216 | for(q = p; *q && !isspace((unsigned char)*q); q++) |
| 217 | continue; |
| 218 | |
| 219 | if(!*q) |
| 220 | { |
| 221 | OCSPerr(OCSP_F_PARSE_HTTP_LINE1, |
| 222 | OCSP_R_SERVER_RESPONSE_PARSE_ERROR); |
| 223 | return 0; |
| 224 | } |
| 225 | |
| 226 | /* Set end of response code and start of message */ |
| 227 | *q++ = 0; |
| 228 | |
| 229 | /* Attempt to parse numeric code */ |
| 230 | retcode = strtoul(p, &r, 10); |
| 231 | |
| 232 | if(*r) |
| 233 | return 0; |
| 234 | |
| 235 | /* Skip over any leading white space in message */ |
| 236 | while(*q && isspace((unsigned char)*q)) |
| 237 | q++; |
| 238 | |
| 239 | if(*q) |
| 240 | { |
| 241 | /* Finally zap any trailing white space in message (include |
| 242 | * CRLF) */ |
| 243 | |
| 244 | /* We know q has a non white space character so this is OK */ |
| 245 | for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--) |
| 246 | *r = 0; |
| 247 | } |
| 248 | if(retcode != 200) |
| 249 | { |
| 250 | OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR); |
| 251 | if(!*q) |
| 252 | ERR_add_error_data(2, "Code=", p); |
| 253 | else |
| 254 | ERR_add_error_data(4, "Code=", p, ",Reason=", q); |
| 255 | return 0; |
| 256 | } |
| 257 | |
| 258 | |
| 259 | return 1; |
| 260 | |
| 261 | } |
| 262 | |
| 263 | int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx) |
| 264 | { |
| 265 | int i, n; |
| 266 | const unsigned char *p; |
| 267 | next_io: |
| 268 | if (!(rctx->state & OHS_NOREAD)) |
| 269 | { |
| 270 | n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen); |
| 271 | |
| 272 | if (n <= 0) |
| 273 | { |
| 274 | if (BIO_should_retry(rctx->io)) |
| 275 | return -1; |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* Write data to memory BIO */ |
| 280 | |
| 281 | if (BIO_write(rctx->mem, rctx->iobuf, n) != n) |
| 282 | return 0; |
| 283 | } |
| 284 | |
| 285 | switch(rctx->state) |
| 286 | { |
| 287 | |
| 288 | case OHS_ASN1_WRITE: |
| 289 | n = BIO_get_mem_data(rctx->mem, &p); |
| 290 | |
| 291 | i = BIO_write(rctx->io, |
| 292 | p + (n - rctx->asn1_len), rctx->asn1_len); |
| 293 | |
| 294 | if (i <= 0) |
| 295 | { |
| 296 | if (BIO_should_retry(rctx->io)) |
| 297 | return -1; |
| 298 | rctx->state = OHS_ERROR; |
| 299 | return 0; |
| 300 | } |
| 301 | |
| 302 | rctx->asn1_len -= i; |
| 303 | |
| 304 | if (rctx->asn1_len > 0) |
| 305 | goto next_io; |
| 306 | |
| 307 | rctx->state = OHS_ASN1_FLUSH; |
| 308 | |
| 309 | (void)BIO_reset(rctx->mem); |
| 310 | |
| 311 | case OHS_ASN1_FLUSH: |
| 312 | |
| 313 | i = BIO_flush(rctx->io); |
| 314 | |
| 315 | if (i > 0) |
| 316 | { |
| 317 | rctx->state = OHS_FIRSTLINE; |
| 318 | goto next_io; |
| 319 | } |
| 320 | |
| 321 | if (BIO_should_retry(rctx->io)) |
| 322 | return -1; |
| 323 | |
| 324 | rctx->state = OHS_ERROR; |
| 325 | return 0; |
| 326 | |
| 327 | case OHS_ERROR: |
| 328 | return 0; |
| 329 | |
| 330 | case OHS_FIRSTLINE: |
| 331 | case OHS_HEADERS: |
| 332 | |
| 333 | /* Attempt to read a line in */ |
| 334 | |
| 335 | next_line: |
| 336 | /* Due to &%^*$" memory BIO behaviour with BIO_gets we |
| 337 | * have to check there's a complete line in there before |
| 338 | * calling BIO_gets or we'll just get a partial read. |
| 339 | */ |
| 340 | n = BIO_get_mem_data(rctx->mem, &p); |
| 341 | if ((n <= 0) || !memchr(p, '\n', n)) |
| 342 | { |
| 343 | if (n >= rctx->iobuflen) |
| 344 | { |
| 345 | rctx->state = OHS_ERROR; |
| 346 | return 0; |
| 347 | } |
| 348 | goto next_io; |
| 349 | } |
| 350 | n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen); |
| 351 | |
| 352 | if (n <= 0) |
| 353 | { |
| 354 | if (BIO_should_retry(rctx->mem)) |
| 355 | goto next_io; |
| 356 | rctx->state = OHS_ERROR; |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | /* Don't allow excessive lines */ |
| 361 | if (n == rctx->iobuflen) |
| 362 | { |
| 363 | rctx->state = OHS_ERROR; |
| 364 | return 0; |
| 365 | } |
| 366 | |
| 367 | /* First line */ |
| 368 | if (rctx->state == OHS_FIRSTLINE) |
| 369 | { |
| 370 | if (parse_http_line1((char *)rctx->iobuf)) |
| 371 | { |
| 372 | rctx->state = OHS_HEADERS; |
| 373 | goto next_line; |
| 374 | } |
| 375 | else |
| 376 | { |
| 377 | rctx->state = OHS_ERROR; |
| 378 | return 0; |
| 379 | } |
| 380 | } |
| 381 | else |
| 382 | { |
| 383 | /* Look for blank line: end of headers */ |
| 384 | for (p = rctx->iobuf; *p; p++) |
| 385 | { |
| 386 | if ((*p != '\r') && (*p != '\n')) |
| 387 | break; |
| 388 | } |
| 389 | if (*p) |
| 390 | goto next_line; |
| 391 | |
| 392 | rctx->state = OHS_ASN1_HEADER; |
| 393 | |
| 394 | } |
| 395 | |
| 396 | /* Fall thru */ |
| 397 | |
| 398 | |
| 399 | case OHS_ASN1_HEADER: |
| 400 | /* Now reading ASN1 header: can read at least 2 bytes which |
| 401 | * is enough for ASN1 SEQUENCE header and either length field |
| 402 | * or at least the length of the length field. |
| 403 | */ |
| 404 | n = BIO_get_mem_data(rctx->mem, &p); |
| 405 | if (n < 2) |
| 406 | goto next_io; |
| 407 | |
| 408 | /* Check it is an ASN1 SEQUENCE */ |
| 409 | if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) |
| 410 | { |
| 411 | rctx->state = OHS_ERROR; |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /* Check out length field */ |
| 416 | if (*p & 0x80) |
| 417 | { |
| 418 | /* If MSB set on initial length octet we can now |
| 419 | * always read 6 octets: make sure we have them. |
| 420 | */ |
| 421 | if (n < 6) |
| 422 | goto next_io; |
| 423 | n = *p & 0x7F; |
| 424 | /* Not NDEF or excessive length */ |
| 425 | if (!n || (n > 4)) |
| 426 | { |
| 427 | rctx->state = OHS_ERROR; |
| 428 | return 0; |
| 429 | } |
| 430 | p++; |
| 431 | rctx->asn1_len = 0; |
| 432 | for (i = 0; i < n; i++) |
| 433 | { |
| 434 | rctx->asn1_len <<= 8; |
| 435 | rctx->asn1_len |= *p++; |
| 436 | } |
| 437 | |
| 438 | if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH) |
| 439 | { |
| 440 | rctx->state = OHS_ERROR; |
| 441 | return 0; |
| 442 | } |
| 443 | |
| 444 | rctx->asn1_len += n + 2; |
| 445 | } |
| 446 | else |
| 447 | rctx->asn1_len = *p + 2; |
| 448 | |
| 449 | rctx->state = OHS_ASN1_CONTENT; |
| 450 | |
| 451 | /* Fall thru */ |
| 452 | |
| 453 | case OHS_ASN1_CONTENT: |
| 454 | n = BIO_get_mem_data(rctx->mem, &p); |
| 455 | if (n < (int)rctx->asn1_len) |
| 456 | goto next_io; |
| 457 | |
| 458 | |
| 459 | *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len); |
| 460 | if (*presp) |
| 461 | { |
| 462 | rctx->state = OHS_DONE; |
| 463 | return 1; |
| 464 | } |
| 465 | |
| 466 | rctx->state = OHS_ERROR; |
| 467 | return 0; |
| 468 | |
| 469 | break; |
| 470 | |
| 471 | case OHS_DONE: |
| 472 | return 1; |
| 473 | |
| 474 | } |
| 475 | |
| 476 | |
| 477 | |
| 478 | return 0; |
| 479 | |
| 480 | |
| 481 | } |
| 482 | |
| 483 | /* Blocking OCSP request handler: now a special case of non-blocking I/O */ |
| 484 | |
| 485 | OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req) |
| 486 | { |
| 487 | OCSP_RESPONSE *resp = NULL; |
| 488 | OCSP_REQ_CTX *ctx; |
| 489 | int rv; |
| 490 | |
| 491 | ctx = OCSP_sendreq_new(b, path, req, -1); |
| 492 | |
| 493 | do |
| 494 | { |
| 495 | rv = OCSP_sendreq_nbio(&resp, ctx); |
| 496 | } while ((rv == -1) && BIO_should_retry(b)); |
| 497 | |
| 498 | OCSP_REQ_CTX_free(ctx); |
| 499 | |
| 500 | if (rv) |
| 501 | return resp; |
| 502 | |
| 503 | return NULL; |
| 504 | } |