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ocsp_ht.c

/* ocsp_ht.c */
/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
 * project 2006.
 */
/* ====================================================================
 * Copyright (c) 2006 The OpenSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer. 
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
 *
 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
 *    endorse or promote products derived from this software without
 *    prior written permission. For written permission, please contact
 *    licensing@OpenSSL.org.
 *
 * 5. Products derived from this software may not be called "OpenSSL"
 *    nor may "OpenSSL" appear in their names without prior written
 *    permission of the OpenSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the OpenSSL Project
 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This product includes cryptographic software written by Eric Young
 * (eay@cryptsoft.com).  This product includes software written by Tim
 * Hudson (tjh@cryptsoft.com).
 *
 */

#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include <string.h>
#include "e_os.h"
#include <openssl/asn1.h>
#include <openssl/ocsp.h>
#include <openssl/err.h>
#include <openssl/buffer.h>
#ifdef OPENSSL_SYS_SUNOS
#define strtoul (unsigned long)strtol
#endif /* OPENSSL_SYS_SUNOS */

/* Stateful OCSP request code, supporting non-blocking I/O */

/* Opaque OCSP request status structure */

struct ocsp_req_ctx_st {
      int state;        /* Current I/O state */
      unsigned char *iobuf;   /* Line buffer */
      int iobuflen;           /* Line buffer length */
      BIO *io;          /* BIO to perform I/O with */
      BIO *mem;         /* Memory BIO response is built into */
      unsigned long asn1_len; /* ASN1 length of response */
      };

#define OCSP_MAX_REQUEST_LENGTH     (100 * 1024)
#define OCSP_MAX_LINE_LEN     4096;

/* OCSP states */

/* If set no reading should be performed */
#define OHS_NOREAD            0x1000
/* Error condition */
#define OHS_ERROR       (0 | OHS_NOREAD)
/* First line being read */
#define OHS_FIRSTLINE         1
/* MIME headers being read */
#define OHS_HEADERS           2
/* OCSP initial header (tag + length) being read */
#define OHS_ASN1_HEADER       3
/* OCSP content octets being read */
#define OHS_ASN1_CONTENT      4
/* Request being sent */
#define OHS_ASN1_WRITE        (6 | OHS_NOREAD)
/* Request being flushed */
#define OHS_ASN1_FLUSH        (7 | OHS_NOREAD)
/* Completed */
#define OHS_DONE        (8 | OHS_NOREAD)


static int parse_http_line1(char *line);

void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
      {
      if (rctx->mem)
            BIO_free(rctx->mem);
      if (rctx->iobuf)
            OPENSSL_free(rctx->iobuf);
      OPENSSL_free(rctx);
      }

OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
                                                int maxline)
      {
      static char post_hdr[] = "POST %s HTTP/1.0\r\n"
      "Content-Type: application/ocsp-request\r\n"
      "Content-Length: %d\r\n\r\n";

      OCSP_REQ_CTX *rctx;
      rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
      rctx->state = OHS_FIRSTLINE;
      rctx->mem = BIO_new(BIO_s_mem());
      rctx->io = io;
      if (maxline > 0)
            rctx->iobuflen = maxline;
      else
            rctx->iobuflen = OCSP_MAX_LINE_LEN;
      rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
      if (!path)
            path = "/";

        if (BIO_printf(rctx->mem, post_hdr, path,
                        i2d_OCSP_REQUEST(req, NULL)) <= 0)
            {
            rctx->state = OHS_ERROR;
            return 0;
            }
        if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0)
            {
            rctx->state = OHS_ERROR;
            return 0;
            }
      rctx->state = OHS_ASN1_WRITE;
      rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);

      return rctx;
      }

/* Parse the HTTP response. This will look like this:
 * "HTTP/1.0 200 OK". We need to obtain the numeric code and
 * (optional) informational message.
 */

static int parse_http_line1(char *line)
      {
      int retcode;
      char *p, *q, *r;
      /* Skip to first white space (passed protocol info) */

      for(p = line; *p && !isspace((unsigned char)*p); p++)
            continue;
      if(!*p)
            {
            OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
                              OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
            return 0;
            }

      /* Skip past white space to start of response code */
      while(*p && isspace((unsigned char)*p))
            p++;

      if(!*p)
            {
            OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
                              OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
            return 0;
            }

      /* Find end of response code: first whitespace after start of code */
      for(q = p; *q && !isspace((unsigned char)*q); q++)
            continue;

      if(!*q)
            {
            OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
                              OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
            return 0;
            }

      /* Set end of response code and start of message */ 
      *q++ = 0;

      /* Attempt to parse numeric code */
      retcode = strtoul(p, &r, 10);

      if(*r)
            return 0;

      /* Skip over any leading white space in message */
      while(*q && isspace((unsigned char)*q))
            q++;

      if(*q)
            {
            /* Finally zap any trailing white space in message (include
             * CRLF) */

            /* We know q has a non white space character so this is OK */
            for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
                  *r = 0;
            }
      if(retcode != 200)
            {
            OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
            if(!*q)
                  ERR_add_error_data(2, "Code=", p);
            else
                  ERR_add_error_data(4, "Code=", p, ",Reason=", q);
            return 0;
            }


      return 1;

      }

int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
      {
      int i, n;
      const unsigned char *p;
      next_io:
      if (!(rctx->state & OHS_NOREAD))
            {
            n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);

            if (n <= 0)
                  {
                  if (BIO_should_retry(rctx->io))
                        return -1;
                  return 0;
                  }

            /* Write data to memory BIO */

            if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
                  return 0;
            }

      switch(rctx->state)
            {

            case OHS_ASN1_WRITE:
            n = BIO_get_mem_data(rctx->mem, &p);

            i = BIO_write(rctx->io,
                  p + (n - rctx->asn1_len), rctx->asn1_len);

            if (i <= 0)
                  {
                  if (BIO_should_retry(rctx->io))
                        return -1;
                  rctx->state = OHS_ERROR;
                  return 0;
                  }

            rctx->asn1_len -= i;

            if (rctx->asn1_len > 0)
                  goto next_io;

            rctx->state = OHS_ASN1_FLUSH;

            (void)BIO_reset(rctx->mem);

            case OHS_ASN1_FLUSH:

            i = BIO_flush(rctx->io);

            if (i > 0)
                  {
                  rctx->state = OHS_FIRSTLINE;
                  goto next_io;
                  }

            if (BIO_should_retry(rctx->io))
                  return -1;

            rctx->state = OHS_ERROR;
            return 0;

            case OHS_ERROR:
            return 0;

            case OHS_FIRSTLINE:
            case OHS_HEADERS:

            /* Attempt to read a line in */

            next_line:
            /* Due to &%^*$" memory BIO behaviour with BIO_gets we
             * have to check there's a complete line in there before
             * calling BIO_gets or we'll just get a partial read.
             */
            n = BIO_get_mem_data(rctx->mem, &p);
            if ((n <= 0) || !memchr(p, '\n', n))
                  {
                  if (n >= rctx->iobuflen)
                        {
                        rctx->state = OHS_ERROR;
                        return 0;
                        }
                  goto next_io;
                  }
            n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);

            if (n <= 0)
                  {
                  if (BIO_should_retry(rctx->mem))
                        goto next_io;
                  rctx->state = OHS_ERROR;
                  return 0;
                  }

            /* Don't allow excessive lines */
            if (n == rctx->iobuflen)
                  {
                  rctx->state = OHS_ERROR;
                  return 0;
                  }

            /* First line */
            if (rctx->state == OHS_FIRSTLINE)
                  {
                  if (parse_http_line1((char *)rctx->iobuf))
                        {
                        rctx->state = OHS_HEADERS;
                        goto next_line;
                        }
                  else
                        {
                        rctx->state = OHS_ERROR;
                        return 0;
                        }
                  }
            else
                  {
                  /* Look for blank line: end of headers */
                  for (p = rctx->iobuf; *p; p++)
                        {
                        if ((*p != '\r') && (*p != '\n'))
                              break;
                        }
                  if (*p)
                        goto next_line;

                  rctx->state = OHS_ASN1_HEADER;

                  }
 
            /* Fall thru */


            case OHS_ASN1_HEADER:
            /* Now reading ASN1 header: can read at least 6 bytes which
             * is more than enough for any valid ASN1 SEQUENCE header
             */
            n = BIO_get_mem_data(rctx->mem, &p);
            if (n < 6)
                  goto next_io;

            /* Check it is an ASN1 SEQUENCE */
            if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
                  {
                  rctx->state = OHS_ERROR;
                  return 0;
                  }

            /* Check out length field */
            if (*p & 0x80)
                  {
                  n = *p & 0x7F;
                  /* Not NDEF or excessive length */
                  if (!n || (n > 4))
                        {
                        rctx->state = OHS_ERROR;
                        return 0;
                        }
                  p++;
                  rctx->asn1_len = 0;
                  for (i = 0; i < n; i++)
                        {
                        rctx->asn1_len <<= 8;
                        rctx->asn1_len |= *p++;
                        }

                  if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH)
                        {
                        rctx->state = OHS_ERROR;
                        return 0;
                        }

                  rctx->asn1_len += n + 2;
                  }
            else
                  rctx->asn1_len = *p + 2;

            rctx->state = OHS_ASN1_CONTENT;

            /* Fall thru */
            
            case OHS_ASN1_CONTENT:
            n = BIO_get_mem_data(rctx->mem, &p);
            if (n < (int)rctx->asn1_len)
                  goto next_io;


            *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
            if (*presp)
                  {
                  rctx->state = OHS_DONE;
                  return 1;
                  }

            rctx->state = OHS_ERROR;
            return 0;

            break;

            case OHS_DONE:
            return 1;

            }



      return 0;


      }

/* Blocking OCSP request handler: now a special case of non-blocking I/O */

OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
      {
      OCSP_RESPONSE *resp = NULL;
      OCSP_REQ_CTX *ctx;
      int rv;

      ctx = OCSP_sendreq_new(b, path, req, -1);

      do
            {
            rv = OCSP_sendreq_nbio(&resp, ctx);
            } while ((rv == -1) && BIO_should_retry(b));

      OCSP_REQ_CTX_free(ctx);

      if (rv)
            return resp;

      return NULL;
      }

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