505 lines
11 KiB
C
505 lines
11 KiB
C
/* ocsp_ht.c */
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/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
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* project 2006.
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*/
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/* ====================================================================
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* Copyright (c) 2006 The OpenSSL Project. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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*
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* 3. All advertising materials mentioning features or use of this
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* software must display the following acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
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*
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* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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* endorse or promote products derived from this software without
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* prior written permission. For written permission, please contact
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* licensing@OpenSSL.org.
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*
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* 5. Products derived from this software may not be called "OpenSSL"
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* nor may "OpenSSL" appear in their names without prior written
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* permission of the OpenSSL Project.
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*
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* 6. Redistributions of any form whatsoever must retain the following
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* acknowledgment:
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* "This product includes software developed by the OpenSSL Project
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* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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*
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* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
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* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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* OF THE POSSIBILITY OF SUCH DAMAGE.
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* ====================================================================
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*
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* This product includes cryptographic software written by Eric Young
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* (eay@cryptsoft.com). This product includes software written by Tim
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* Hudson (tjh@cryptsoft.com).
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*
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h>
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#include <string.h>
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#include "e_os.h"
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#include <openssl/asn1.h>
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#include <openssl/ocsp.h>
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#include <openssl/err.h>
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#include <openssl/buffer.h>
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#ifdef OPENSSL_SYS_SUNOS
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#define strtoul (unsigned long)strtol
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#endif /* OPENSSL_SYS_SUNOS */
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/* Stateful OCSP request code, supporting non-blocking I/O */
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/* Opaque OCSP request status structure */
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struct ocsp_req_ctx_st {
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int state; /* Current I/O state */
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unsigned char *iobuf; /* Line buffer */
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int iobuflen; /* Line buffer length */
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BIO *io; /* BIO to perform I/O with */
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BIO *mem; /* Memory BIO response is built into */
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unsigned long asn1_len; /* ASN1 length of response */
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};
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#define OCSP_MAX_REQUEST_LENGTH (100 * 1024)
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#define OCSP_MAX_LINE_LEN 4096;
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/* OCSP states */
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/* If set no reading should be performed */
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#define OHS_NOREAD 0x1000
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/* Error condition */
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#define OHS_ERROR (0 | OHS_NOREAD)
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/* First line being read */
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#define OHS_FIRSTLINE 1
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/* MIME headers being read */
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#define OHS_HEADERS 2
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/* OCSP initial header (tag + length) being read */
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#define OHS_ASN1_HEADER 3
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/* OCSP content octets being read */
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#define OHS_ASN1_CONTENT 4
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/* Request being sent */
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#define OHS_ASN1_WRITE (6 | OHS_NOREAD)
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/* Request being flushed */
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#define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
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/* Completed */
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#define OHS_DONE (8 | OHS_NOREAD)
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static int parse_http_line1(char *line);
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void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
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{
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if (rctx->mem)
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BIO_free(rctx->mem);
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if (rctx->iobuf)
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OPENSSL_free(rctx->iobuf);
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OPENSSL_free(rctx);
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}
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int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
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{
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static const char req_hdr[] =
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"Content-Type: application/ocsp-request\r\n"
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"Content-Length: %d\r\n\r\n";
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if (BIO_printf(rctx->mem, req_hdr, i2d_OCSP_REQUEST(req, NULL)) <= 0)
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return 0;
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if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0)
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return 0;
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rctx->state = OHS_ASN1_WRITE;
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rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
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return 1;
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}
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int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
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const char *name, const char *value)
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{
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if (!name)
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return 0;
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if (BIO_puts(rctx->mem, name) <= 0)
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return 0;
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if (value)
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{
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if (BIO_write(rctx->mem, ": ", 2) != 2)
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return 0;
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if (BIO_puts(rctx->mem, value) <= 0)
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return 0;
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}
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if (BIO_write(rctx->mem, "\r\n", 2) != 2)
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return 0;
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return 1;
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}
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OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
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int maxline)
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{
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static const char post_hdr[] = "POST %s HTTP/1.0\r\n";
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OCSP_REQ_CTX *rctx;
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rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
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rctx->state = OHS_ERROR;
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rctx->mem = BIO_new(BIO_s_mem());
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rctx->io = io;
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rctx->asn1_len = 0;
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if (maxline > 0)
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rctx->iobuflen = maxline;
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else
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rctx->iobuflen = OCSP_MAX_LINE_LEN;
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rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
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if (!rctx->iobuf)
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return 0;
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if (!path)
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path = "/";
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if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
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return 0;
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if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
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return 0;
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return rctx;
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}
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/* Parse the HTTP response. This will look like this:
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* "HTTP/1.0 200 OK". We need to obtain the numeric code and
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* (optional) informational message.
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*/
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static int parse_http_line1(char *line)
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{
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int retcode;
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char *p, *q, *r;
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/* Skip to first white space (passed protocol info) */
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for(p = line; *p && !isspace((unsigned char)*p); p++)
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continue;
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if(!*p)
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{
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
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OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
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return 0;
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}
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/* Skip past white space to start of response code */
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while(*p && isspace((unsigned char)*p))
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p++;
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if(!*p)
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{
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
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OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
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return 0;
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}
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/* Find end of response code: first whitespace after start of code */
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for(q = p; *q && !isspace((unsigned char)*q); q++)
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continue;
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if(!*q)
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{
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
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OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
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return 0;
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}
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/* Set end of response code and start of message */
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*q++ = 0;
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/* Attempt to parse numeric code */
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retcode = strtoul(p, &r, 10);
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if(*r)
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return 0;
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/* Skip over any leading white space in message */
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while(*q && isspace((unsigned char)*q))
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q++;
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if(*q)
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{
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/* Finally zap any trailing white space in message (include
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* CRLF) */
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/* We know q has a non white space character so this is OK */
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for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
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*r = 0;
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}
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if(retcode != 200)
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{
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OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
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if(!*q)
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ERR_add_error_data(2, "Code=", p);
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else
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ERR_add_error_data(4, "Code=", p, ",Reason=", q);
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return 0;
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}
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return 1;
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}
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int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
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{
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int i, n;
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const unsigned char *p;
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next_io:
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if (!(rctx->state & OHS_NOREAD))
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{
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n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
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if (n <= 0)
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{
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if (BIO_should_retry(rctx->io))
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return -1;
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return 0;
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}
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/* Write data to memory BIO */
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if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
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return 0;
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}
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switch(rctx->state)
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{
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case OHS_ASN1_WRITE:
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n = BIO_get_mem_data(rctx->mem, &p);
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i = BIO_write(rctx->io,
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p + (n - rctx->asn1_len), rctx->asn1_len);
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if (i <= 0)
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{
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if (BIO_should_retry(rctx->io))
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return -1;
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rctx->state = OHS_ERROR;
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return 0;
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}
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rctx->asn1_len -= i;
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if (rctx->asn1_len > 0)
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goto next_io;
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rctx->state = OHS_ASN1_FLUSH;
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(void)BIO_reset(rctx->mem);
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case OHS_ASN1_FLUSH:
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i = BIO_flush(rctx->io);
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if (i > 0)
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{
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rctx->state = OHS_FIRSTLINE;
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goto next_io;
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}
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if (BIO_should_retry(rctx->io))
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return -1;
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rctx->state = OHS_ERROR;
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return 0;
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case OHS_ERROR:
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return 0;
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case OHS_FIRSTLINE:
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case OHS_HEADERS:
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/* Attempt to read a line in */
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next_line:
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/* Due to &%^*$" memory BIO behaviour with BIO_gets we
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* have to check there's a complete line in there before
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* calling BIO_gets or we'll just get a partial read.
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*/
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n = BIO_get_mem_data(rctx->mem, &p);
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if ((n <= 0) || !memchr(p, '\n', n))
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{
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if (n >= rctx->iobuflen)
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{
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rctx->state = OHS_ERROR;
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return 0;
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}
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goto next_io;
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}
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n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
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if (n <= 0)
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{
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if (BIO_should_retry(rctx->mem))
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goto next_io;
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rctx->state = OHS_ERROR;
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return 0;
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}
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/* Don't allow excessive lines */
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if (n == rctx->iobuflen)
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{
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rctx->state = OHS_ERROR;
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return 0;
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}
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/* First line */
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if (rctx->state == OHS_FIRSTLINE)
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{
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if (parse_http_line1((char *)rctx->iobuf))
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{
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rctx->state = OHS_HEADERS;
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goto next_line;
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}
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else
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{
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rctx->state = OHS_ERROR;
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return 0;
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}
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}
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else
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{
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/* Look for blank line: end of headers */
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for (p = rctx->iobuf; *p; p++)
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{
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if ((*p != '\r') && (*p != '\n'))
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break;
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}
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if (*p)
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goto next_line;
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rctx->state = OHS_ASN1_HEADER;
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}
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/* Fall thru */
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case OHS_ASN1_HEADER:
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/* Now reading ASN1 header: can read at least 2 bytes which
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* is enough for ASN1 SEQUENCE header and either length field
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* or at least the length of the length field.
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*/
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n = BIO_get_mem_data(rctx->mem, &p);
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if (n < 2)
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goto next_io;
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/* Check it is an ASN1 SEQUENCE */
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if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
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{
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rctx->state = OHS_ERROR;
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return 0;
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}
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/* Check out length field */
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if (*p & 0x80)
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{
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/* If MSB set on initial length octet we can now
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* always read 6 octets: make sure we have them.
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*/
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if (n < 6)
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goto next_io;
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n = *p & 0x7F;
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/* Not NDEF or excessive length */
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if (!n || (n > 4))
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{
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rctx->state = OHS_ERROR;
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return 0;
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}
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p++;
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rctx->asn1_len = 0;
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for (i = 0; i < n; i++)
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{
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rctx->asn1_len <<= 8;
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rctx->asn1_len |= *p++;
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}
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if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH)
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{
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rctx->state = OHS_ERROR;
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return 0;
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}
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rctx->asn1_len += n + 2;
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}
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else
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rctx->asn1_len = *p + 2;
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rctx->state = OHS_ASN1_CONTENT;
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/* Fall thru */
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case OHS_ASN1_CONTENT:
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n = BIO_get_mem_data(rctx->mem, &p);
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if (n < (int)rctx->asn1_len)
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goto next_io;
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*presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
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if (*presp)
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{
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rctx->state = OHS_DONE;
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return 1;
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}
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rctx->state = OHS_ERROR;
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return 0;
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break;
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case OHS_DONE:
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return 1;
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}
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return 0;
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}
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/* Blocking OCSP request handler: now a special case of non-blocking I/O */
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OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
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{
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OCSP_RESPONSE *resp = NULL;
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OCSP_REQ_CTX *ctx;
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int rv;
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ctx = OCSP_sendreq_new(b, path, req, -1);
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do
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{
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rv = OCSP_sendreq_nbio(&resp, ctx);
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} while ((rv == -1) && BIO_should_retry(b));
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OCSP_REQ_CTX_free(ctx);
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if (rv)
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return resp;
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return NULL;
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}
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