OpenSSL 1.0.1i

[tomato.git] / release / src / router / openssl / crypto / ocsp / 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);
        }

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));
        if (!rctx)
                return NULL;
        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->mem || !rctx->iobuf)
                goto err;
        if (!path)
                path = "/";

        if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
                goto err;

        if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
                goto err;

        return rctx;
        err:
        OCSP_REQ_CTX_free(rctx);
        return NULL;
        }

/* 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 2 bytes which
                 * is enough for ASN1 SEQUENCE header and either length field
                 * or at least the length of the length field.
                 */
                n = BIO_get_mem_data(rctx->mem, &p);
                if (n < 2)
                        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)
                        {
                        /* If MSB set on initial length octet we can now
                         * always read 6 octets: make sure we have them.
                         */
                        if (n < 6)
                                goto next_io;
                        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);

        if (!ctx)
                return NULL;

        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;
        }