crypto/openssl-0.9/crypto/ocsp/ocsp_ht.c

   1 /* ocsp_ht.c */
   2 /* Written by Dr Stephen N Henson (shenson@bigfoot.com) 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 <openssl/asn1.h>
  60 #include <stdio.h>
  61 #include <stdlib.h>
  62 #include <ctype.h>
  63 #include <string.h>
  64 #include <openssl/ocsp.h>
  65 #include <openssl/err.h>
  66 #include <openssl/buffer.h>
  67 #ifdef OPENSSL_SYS_SUNOS
  68 #define strtoul (unsigned long)strtol
  69 #endif /* OPENSSL_SYS_SUNOS */
  70
  71 /* Stateful OCSP request code, supporting non-blocking I/O */
  72
  73 /* Opaque OCSP request status structure */
  74
  75 struct ocsp_req_ctx_st {
  76         int state;              /* Current I/O state */
  77         unsigned char *iobuf;   /* Line buffer */
  78         int iobuflen;           /* Line buffer length */
  79         BIO *io;                /* BIO to perform I/O with */
  80         BIO *mem;               /* Memory BIO response is built into */
  81         unsigned long asn1_len; /* ASN1 length of response */
  82         };
  83
  84 #define OCSP_MAX_REQUEST_LENGTH (100 * 1024)
  85 #define OCSP_MAX_LINE_LEN       4096;
  86
  87 /* OCSP states */
  88
  89 /* If set no reading should be performed */
  90 #define OHS_NOREAD              0x1000
  91 /* Error condition */
  92 #define OHS_ERROR               (0 | OHS_NOREAD)
  93 /* First line being read */
  94 #define OHS_FIRSTLINE           1
  95 /* MIME headers being read */
  96 #define OHS_HEADERS             2
  97 /* OCSP initial header (tag + length) being read */
  98 #define OHS_ASN1_HEADER         3
  99 /* OCSP content octets being read */
 100 #define OHS_ASN1_CONTENT        4
 101 /* Request being sent */
 102 #define OHS_ASN1_WRITE          (6 | OHS_NOREAD)
 103 /* Request being flushed */
 104 #define OHS_ASN1_FLUSH          (7 | OHS_NOREAD)
 105 /* Completed */
 106 #define OHS_DONE                (8 | OHS_NOREAD)
 107
 108
 109 static int parse_http_line1(char *line);
 110
 111 void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
 112         {
 113         if (rctx->mem)
 114                 BIO_free(rctx->mem);
 115         if (rctx->iobuf)
 116                 OPENSSL_free(rctx->iobuf);
 117         OPENSSL_free(rctx);
 118         }
 119
 120 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
 121                                                                 int maxline)
 122         {
 123         static char post_hdr[] = "POST %s HTTP/1.0\r\n"
 124         "Content-Type: application/ocsp-request\r\n"
 125         "Content-Length: %d\r\n\r\n";
 126
 127         OCSP_REQ_CTX *rctx;
 128         rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
 129         rctx->state = OHS_FIRSTLINE;
 130         rctx->mem = BIO_new(BIO_s_mem());
 131         rctx->io = io;
 132         if (maxline > 0)
 133                 rctx->iobuflen = maxline;
 134         else
 135                 rctx->iobuflen = OCSP_MAX_LINE_LEN;
 136         rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
 137         if (!path)
 138                 path = "/";
 139
 140         if (BIO_printf(rctx->mem, post_hdr, path,
 141                                 i2d_OCSP_REQUEST(req, NULL)) <= 0)
 142                 {
 143                 rctx->state = OHS_ERROR;
 144                 return 0;
 145                 }
 146         if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0)
 147                 {
 148                 rctx->state = OHS_ERROR;
 149                 return 0;
 150                 }
 151         rctx->state = OHS_ASN1_WRITE;
 152         rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
 153
 154         return rctx;
 155         }
 156
 157 /* Parse the HTTP response. This will look like this:
 158  * "HTTP/1.0 200 OK". We need to obtain the numeric code and
 159  * (optional) informational message.
 160  */
 161
 162 static int parse_http_line1(char *line)
 163         {
 164         int retcode;
 165         char *p, *q, *r;
 166         /* Skip to first white space (passed protocol info) */
 167
 168         for(p = line; *p && !isspace((unsigned char)*p); p++)
 169                 continue;
 170         if(!*p)
 171                 {
 172                 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
 173                                         OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
 174                 return 0;
 175                 }
 176
 177         /* Skip past white space to start of response code */
 178         while(*p && isspace((unsigned char)*p))
 179                 p++;
 180
 181         if(!*p)
 182                 {
 183                 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
 184                                         OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
 185                 return 0;
 186                 }
 187
 188         /* Find end of response code: first whitespace after start of code */
 189         for(q = p; *q && !isspace((unsigned char)*q); q++)
 190                 continue;
 191
 192         if(!*q)
 193                 {
 194                 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
 195                                         OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
 196                 return 0;
 197                 }
 198
 199         /* Set end of response code and start of message */
 200         *q++ = 0;
 201
 202         /* Attempt to parse numeric code */
 203         retcode = strtoul(p, &r, 10);
 204
 205         if(*r)
 206                 return 0;
 207
 208         /* Skip over any leading white space in message */
 209         while(*q && isspace((unsigned char)*q))
 210                 q++;
 211
 212         if(*q)
 213                 {
 214                 /* Finally zap any trailing white space in message (include
 215                  * CRLF) */
 216
 217                 /* We know q has a non white space character so this is OK */
 218                 for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
 219                         *r = 0;
 220                 }
 221         if(retcode != 200)
 222                 {
 223                 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
 224                 if(!*q)
 225                         ERR_add_error_data(2, "Code=", p);
 226                 else
 227                         ERR_add_error_data(4, "Code=", p, ",Reason=", q);
 228                 return 0;
 229                 }
 230
 231
 232         return 1;
 233
 234         }
 235
 236 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
 237         {
 238         int i, n;
 239         const unsigned char *p;
 240         next_io:
 241         if (!(rctx->state & OHS_NOREAD))
 242                 {
 243                 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
 244
 245                 if (n <= 0)
 246                         {
 247                         if (BIO_should_retry(rctx->io))
 248                                 return -1;
 249                         return 0;
 250                         }
 251
 252                 /* Write data to memory BIO */
 253
 254                 if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
 255                         return 0;
 256                 }
 257
 258         switch(rctx->state)
 259                 {
 260
 261                 case OHS_ASN1_WRITE:
 262                 n = BIO_get_mem_data(rctx->mem, &p);
 263
 264                 i = BIO_write(rctx->io,
 265                         p + (n - rctx->asn1_len), rctx->asn1_len);
 266
 267                 if (i <= 0)
 268                         {
 269                         if (BIO_should_retry(rctx->io))
 270                                 return -1;
 271                         rctx->state = OHS_ERROR;
 272                         return 0;
 273                         }
 274
 275                 rctx->asn1_len -= i;
 276
 277                 if (rctx->asn1_len > 0)
 278                         goto next_io;
 279
 280                 rctx->state = OHS_ASN1_FLUSH;
 281
 282                 (void)BIO_reset(rctx->mem);
 283
 284                 case OHS_ASN1_FLUSH:
 285
 286                 i = BIO_flush(rctx->io);
 287
 288                 if (i > 0)
 289                         {
 290                         rctx->state = OHS_FIRSTLINE;
 291                         goto next_io;
 292                         }
 293
 294                 if (BIO_should_retry(rctx->io))
 295                         return -1;
 296
 297                 rctx->state = OHS_ERROR;
 298                 return 0;
 299
 300                 case OHS_ERROR:
 301                 return 0;
 302
 303                 case OHS_FIRSTLINE:
 304                 case OHS_HEADERS:
 305
 306                 /* Attempt to read a line in */
 307
 308                 next_line:
 309                 /* Due to &%^*$" memory BIO behaviour with BIO_gets we
 310                  * have to check there's a complete line in there before
 311                  * calling BIO_gets or we'll just get a partial read.
 312                  */
 313                 n = BIO_get_mem_data(rctx->mem, &p);
 314                 if ((n <= 0) || !memchr(p, '\n', n))
 315                         {
 316                         if (n >= rctx->iobuflen)
 317                                 {
 318                                 rctx->state = OHS_ERROR;
 319                                 return 0;
 320                                 }
 321                         goto next_io;
 322                         }
 323                 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
 324
 325                 if (n <= 0)
 326                         {
 327                         if (BIO_should_retry(rctx->mem))
 328                                 goto next_io;
 329                         rctx->state = OHS_ERROR;
 330                         return 0;
 331                         }
 332
 333                 /* Don't allow excessive lines */
 334                 if (n == rctx->iobuflen)
 335                         {
 336                         rctx->state = OHS_ERROR;
 337                         return 0;
 338                         }
 339
 340                 /* First line */
 341                 if (rctx->state == OHS_FIRSTLINE)
 342                         {
 343                         if (parse_http_line1((char *)rctx->iobuf))
 344                                 {
 345                                 rctx->state = OHS_HEADERS;
 346                                 goto next_line;
 347                                 }
 348                         else
 349                                 {
 350                                 rctx->state = OHS_ERROR;
 351                                 return 0;
 352                                 }
 353                         }
 354                 else
 355                         {
 356                         /* Look for blank line: end of headers */
 357                         for (p = rctx->iobuf; *p; p++)
 358                                 {
 359                                 if ((*p != '\r') && (*p != '\n'))
 360                                         break;
 361                                 }
 362                         if (*p)
 363                                 goto next_line;
 364
 365                         rctx->state = OHS_ASN1_HEADER;
 366
 367                         }
 368
 369                 /* Fall thru */
 370
 371
 372                 case OHS_ASN1_HEADER:
 373                 /* Now reading ASN1 header: can read at least 6 bytes which
 374                  * is more than enough for any valid ASN1 SEQUENCE header
 375                  */
 376                 n = BIO_get_mem_data(rctx->mem, &p);
 377                 if (n < 6)
 378                         goto next_io;
 379
 380                 /* Check it is an ASN1 SEQUENCE */
 381                 if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
 382                         {
 383                         rctx->state = OHS_ERROR;
 384                         return 0;
 385                         }
 386
 387                 /* Check out length field */
 388                 if (*p & 0x80)
 389                         {
 390                         n = *p & 0x7F;
 391                         /* Not NDEF or excessive length */
 392                         if (!n || (n > 4))
 393                                 {
 394                                 rctx->state = OHS_ERROR;
 395                                 return 0;
 396                                 }
 397                         p++;
 398                         rctx->asn1_len = 0;
 399                         for (i = 0; i < n; i++)
 400                                 {
 401                                 rctx->asn1_len <<= 8;
 402                                 rctx->asn1_len |= *p++;
 403                                 }
 404
 405                         if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH)
 406                                 {
 407                                 rctx->state = OHS_ERROR;
 408                                 return 0;
 409                                 }
 410
 411                         rctx->asn1_len += n + 2;
 412                         }
 413                 else
 414                         rctx->asn1_len = *p + 2;
 415
 416                 rctx->state = OHS_ASN1_CONTENT;
 417
 418                 /* Fall thru */
 419
 420                 case OHS_ASN1_CONTENT:
 421                 n = BIO_get_mem_data(rctx->mem, &p);
 422                 if (n < (int)rctx->asn1_len)
 423                         goto next_io;
 424
 425
 426                 *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
 427                 if (*presp)
 428                         {
 429                         rctx->state = OHS_DONE;
 430                         return 1;
 431                         }
 432
 433                 rctx->state = OHS_ERROR;
 434                 return 0;
 435
 436                 break;
 437
 438                 case OHS_DONE:
 439                 return 1;
 440
 441                 }
 442
 443
 444
 445         return 0;
 446
 447
 448         }
 449
 450 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
 451
 452 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
 453         {
 454         OCSP_RESPONSE *resp = NULL;
 455         OCSP_REQ_CTX *ctx;
 456         int rv;
 457
 458         ctx = OCSP_sendreq_new(b, path, req, -1);
 459
 460         do
 461                 {
 462                 rv = OCSP_sendreq_nbio(&resp, ctx);
 463                 } while ((rv == -1) && BIO_should_retry(b));
 464
 465         OCSP_REQ_CTX_free(ctx);
 466
 467         if (rv)
 468                 return resp;
 469
 470         return NULL;
 471         }