You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
476 lines
13 KiB
476 lines
13 KiB
/* 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; |
|
}
|
|
|