1 /* ocsp_ht.c */ 2 /* Written by Dr Stephen N Henson (steve (at) 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 (at) 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 (at) cryptsoft.com). This product includes software written by Tim 55 * Hudson (tjh (at) 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 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req, 122 int maxline) 123 { 124 static char post_hdr[] = "POST %s HTTP/1.0\r\n" 125 "Content-Type: application/ocsp-request\r\n" 126 "Content-Length: %d\r\n\r\n"; 127 128 OCSP_REQ_CTX *rctx; 129 rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX)); 130 rctx->state = OHS_FIRSTLINE; 131 rctx->mem = BIO_new(BIO_s_mem()); 132 rctx->io = io; 133 if (maxline > 0) 134 rctx->iobuflen = maxline; 135 else 136 rctx->iobuflen = OCSP_MAX_LINE_LEN; 137 rctx->iobuf = OPENSSL_malloc(rctx->iobuflen); 138 if (!path) 139 path = "/"; 140 141 if (BIO_printf(rctx->mem, post_hdr, path, 142 i2d_OCSP_REQUEST(req, NULL)) <= 0) 143 { 144 rctx->state = OHS_ERROR; 145 return 0; 146 } 147 if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0) 148 { 149 rctx->state = OHS_ERROR; 150 return 0; 151 } 152 rctx->state = OHS_ASN1_WRITE; 153 rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL); 154 155 return rctx; 156 } 157 158 /* Parse the HTTP response. This will look like this: 159 * "HTTP/1.0 200 OK". We need to obtain the numeric code and 160 * (optional) informational message. 161 */ 162 163 static int parse_http_line1(char *line) 164 { 165 int retcode; 166 char *p, *q, *r; 167 /* Skip to first white space (passed protocol info) */ 168 169 for(p = line; *p && !isspace((unsigned char)*p); p++) 170 continue; 171 if(!*p) 172 { 173 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, 174 OCSP_R_SERVER_RESPONSE_PARSE_ERROR); 175 return 0; 176 } 177 178 /* Skip past white space to start of response code */ 179 while(*p && isspace((unsigned char)*p)) 180 p++; 181 182 if(!*p) 183 { 184 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, 185 OCSP_R_SERVER_RESPONSE_PARSE_ERROR); 186 return 0; 187 } 188 189 /* Find end of response code: first whitespace after start of code */ 190 for(q = p; *q && !isspace((unsigned char)*q); q++) 191 continue; 192 193 if(!*q) 194 { 195 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, 196 OCSP_R_SERVER_RESPONSE_PARSE_ERROR); 197 return 0; 198 } 199 200 /* Set end of response code and start of message */ 201 *q++ = 0; 202 203 /* Attempt to parse numeric code */ 204 retcode = strtoul(p, &r, 10); 205 206 if(*r) 207 return 0; 208 209 /* Skip over any leading white space in message */ 210 while(*q && isspace((unsigned char)*q)) 211 q++; 212 213 if(*q) 214 { 215 /* Finally zap any trailing white space in message (include 216 * CRLF) */ 217 218 /* We know q has a non white space character so this is OK */ 219 for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--) 220 *r = 0; 221 } 222 if(retcode != 200) 223 { 224 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR); 225 if(!*q) 226 ERR_add_error_data(2, "Code=", p); 227 else 228 ERR_add_error_data(4, "Code=", p, ",Reason=", q); 229 return 0; 230 } 231 232 233 return 1; 234 235 } 236 237 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx) 238 { 239 int i, n; 240 const unsigned char *p; 241 next_io: 242 if (!(rctx->state & OHS_NOREAD)) 243 { 244 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen); 245 246 if (n <= 0) 247 { 248 if (BIO_should_retry(rctx->io)) 249 return -1; 250 return 0; 251 } 252 253 /* Write data to memory BIO */ 254 255 if (BIO_write(rctx->mem, rctx->iobuf, n) != n) 256 return 0; 257 } 258 259 switch(rctx->state) 260 { 261 262 case OHS_ASN1_WRITE: 263 n = BIO_get_mem_data(rctx->mem, &p); 264 265 i = BIO_write(rctx->io, 266 p + (n - rctx->asn1_len), rctx->asn1_len); 267 268 if (i <= 0) 269 { 270 if (BIO_should_retry(rctx->io)) 271 return -1; 272 rctx->state = OHS_ERROR; 273 return 0; 274 } 275 276 rctx->asn1_len -= i; 277 278 if (rctx->asn1_len > 0) 279 goto next_io; 280 281 rctx->state = OHS_ASN1_FLUSH; 282 283 (void)BIO_reset(rctx->mem); 284 285 case OHS_ASN1_FLUSH: 286 287 i = BIO_flush(rctx->io); 288 289 if (i > 0) 290 { 291 rctx->state = OHS_FIRSTLINE; 292 goto next_io; 293 } 294 295 if (BIO_should_retry(rctx->io)) 296 return -1; 297 298 rctx->state = OHS_ERROR; 299 return 0; 300 301 case OHS_ERROR: 302 return 0; 303 304 case OHS_FIRSTLINE: 305 case OHS_HEADERS: 306 307 /* Attempt to read a line in */ 308 309 next_line: 310 /* Due to &%^*$" memory BIO behaviour with BIO_gets we 311 * have to check there's a complete line in there before 312 * calling BIO_gets or we'll just get a partial read. 313 */ 314 n = BIO_get_mem_data(rctx->mem, &p); 315 if ((n <= 0) || !memchr(p, '\n', n)) 316 { 317 if (n >= rctx->iobuflen) 318 { 319 rctx->state = OHS_ERROR; 320 return 0; 321 } 322 goto next_io; 323 } 324 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen); 325 326 if (n <= 0) 327 { 328 if (BIO_should_retry(rctx->mem)) 329 goto next_io; 330 rctx->state = OHS_ERROR; 331 return 0; 332 } 333 334 /* Don't allow excessive lines */ 335 if (n == rctx->iobuflen) 336 { 337 rctx->state = OHS_ERROR; 338 return 0; 339 } 340 341 /* First line */ 342 if (rctx->state == OHS_FIRSTLINE) 343 { 344 if (parse_http_line1((char *)rctx->iobuf)) 345 { 346 rctx->state = OHS_HEADERS; 347 goto next_line; 348 } 349 else 350 { 351 rctx->state = OHS_ERROR; 352 return 0; 353 } 354 } 355 else 356 { 357 /* Look for blank line: end of headers */ 358 for (p = rctx->iobuf; *p; p++) 359 { 360 if ((*p != '\r') && (*p != '\n')) 361 break; 362 } 363 if (*p) 364 goto next_line; 365 366 rctx->state = OHS_ASN1_HEADER; 367 368 } 369 370 /* Fall thru */ 371 372 373 case OHS_ASN1_HEADER: 374 /* Now reading ASN1 header: can read at least 6 bytes which 375 * is more than enough for any valid ASN1 SEQUENCE header 376 */ 377 n = BIO_get_mem_data(rctx->mem, &p); 378 if (n < 6) 379 goto next_io; 380 381 /* Check it is an ASN1 SEQUENCE */ 382 if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED)) 383 { 384 rctx->state = OHS_ERROR; 385 return 0; 386 } 387 388 /* Check out length field */ 389 if (*p & 0x80) 390 { 391 n = *p & 0x7F; 392 /* Not NDEF or excessive length */ 393 if (!n || (n > 4)) 394 { 395 rctx->state = OHS_ERROR; 396 return 0; 397 } 398 p++; 399 rctx->asn1_len = 0; 400 for (i = 0; i < n; i++) 401 { 402 rctx->asn1_len <<= 8; 403 rctx->asn1_len |= *p++; 404 } 405 406 if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH) 407 { 408 rctx->state = OHS_ERROR; 409 return 0; 410 } 411 412 rctx->asn1_len += n + 2; 413 } 414 else 415 rctx->asn1_len = *p + 2; 416 417 rctx->state = OHS_ASN1_CONTENT; 418 419 /* Fall thru */ 420 421 case OHS_ASN1_CONTENT: 422 n = BIO_get_mem_data(rctx->mem, &p); 423 if (n < (int)rctx->asn1_len) 424 goto next_io; 425 426 427 *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len); 428 if (*presp) 429 { 430 rctx->state = OHS_DONE; 431 return 1; 432 } 433 434 rctx->state = OHS_ERROR; 435 return 0; 436 437 break; 438 439 case OHS_DONE: 440 return 1; 441 442 } 443 444 445 446 return 0; 447 448 449 } 450 451 /* Blocking OCSP request handler: now a special case of non-blocking I/O */ 452 453 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req) 454 { 455 OCSP_RESPONSE *resp = NULL; 456 OCSP_REQ_CTX *ctx; 457 int rv; 458 459 ctx = OCSP_sendreq_new(b, path, req, -1); 460 461 do 462 { 463 rv = OCSP_sendreq_nbio(&resp, ctx); 464 } while ((rv == -1) && BIO_should_retry(b)); 465 466 OCSP_REQ_CTX_free(ctx); 467 468 if (rv) 469 return resp; 470 471 return NULL; 472 } 473
