499 lines
11 KiB
C
499 lines
11 KiB
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);
|
|
}
|
|
|
|
int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
|
|
{
|
|
static const char req_hdr[] =
|
|
"Content-Type: application/ocsp-request\r\n"
|
|
"Content-Length: %d\r\n\r\n";
|
|
if (BIO_printf(rctx->mem, req_hdr, i2d_OCSP_REQUEST(req, NULL)) <= 0)
|
|
return 0;
|
|
if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0)
|
|
return 0;
|
|
rctx->state = OHS_ASN1_WRITE;
|
|
rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
|
|
return 1;
|
|
}
|
|
|
|
int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
|
|
const char *name, const char *value)
|
|
{
|
|
if (!name)
|
|
return 0;
|
|
if (BIO_puts(rctx->mem, name) <= 0)
|
|
return 0;
|
|
if (value)
|
|
{
|
|
if (BIO_write(rctx->mem, ": ", 2) != 2)
|
|
return 0;
|
|
if (BIO_puts(rctx->mem, value) <= 0)
|
|
return 0;
|
|
}
|
|
if (BIO_write(rctx->mem, "\r\n", 2) != 2)
|
|
return 0;
|
|
return 1;
|
|
}
|
|
|
|
OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
|
|
int maxline)
|
|
{
|
|
static const char post_hdr[] = "POST %s HTTP/1.0\r\n";
|
|
|
|
OCSP_REQ_CTX *rctx;
|
|
rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
|
|
rctx->state = OHS_ERROR;
|
|
rctx->mem = BIO_new(BIO_s_mem());
|
|
rctx->io = io;
|
|
rctx->asn1_len = 0;
|
|
if (maxline > 0)
|
|
rctx->iobuflen = maxline;
|
|
else
|
|
rctx->iobuflen = OCSP_MAX_LINE_LEN;
|
|
rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
|
|
if (!rctx->iobuf)
|
|
return 0;
|
|
if (!path)
|
|
path = "/";
|
|
|
|
if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
|
|
return 0;
|
|
|
|
if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
|
|
return 0;
|
|
|
|
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;
|
|
}
|