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New non-blocking OCSP functionality.

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This commit is contained in:
Dr. Stephen Henson
2006-07-17 12:18:28 +00:00
parent dff2922aa7
commit c1c6c0bf45
5 changed files with 398 additions and 87 deletions
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3
CHANGES
View File

@@ -4,6 +4,9 @@
Changes between 0.9.8b and 0.9.9 [xx XXX xxxx]
*) Non-blocking OCSP request processing.
[Steve Henson]
*) Allow digests to supply their own micalg string for S/MIME type using
the ctrl EVP_MD_CTRL_MICALG.
[Steve Henson]

6
crypto/ocsp/ocsp.h
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@@ -64,6 +64,7 @@
#ifndef HEADER_OCSP_H
#define HEADER_OCSP_H
#include <openssl/ossl_typ.h>
#include <openssl/x509.h>
#include <openssl/x509v3.h>
#include <openssl/safestack.h>
@@ -397,6 +398,10 @@ typedef struct ocsp_service_locator_st
(char *(*)())d2i_OCSP_CERTSTATUS,(char *)(cs))
OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req);
OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
int maxline);
int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx);
void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx);
OCSP_CERTID *OCSP_cert_to_id(const EVP_MD *dgst, X509 *subject, X509 *issuer);
@@ -574,6 +579,7 @@ void ERR_load_OCSP_strings(void);
#define OCSP_F_OCSP_REQUEST_VERIFY 116
#define OCSP_F_OCSP_RESPONSE_GET1_BASIC 111
#define OCSP_F_OCSP_SENDREQ_BIO 112
#define OCSP_F_OCSP_SENDREQ_NBIO 117
#define OCSP_F_REQUEST_VERIFY 113
/* Reason codes. */

1
crypto/ocsp/ocsp_err.c
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@@ -86,6 +86,7 @@ static ERR_STRING_DATA OCSP_str_functs[]=
{ERR_FUNC(OCSP_F_OCSP_REQUEST_VERIFY), "OCSP_request_verify"},
{ERR_FUNC(OCSP_F_OCSP_RESPONSE_GET1_BASIC), "OCSP_response_get1_basic"},
{ERR_FUNC(OCSP_F_OCSP_SENDREQ_BIO), "OCSP_sendreq_bio"},
{ERR_FUNC(OCSP_F_OCSP_SENDREQ_NBIO), "OCSP_sendreq_nbio"},
{ERR_FUNC(OCSP_F_REQUEST_VERIFY), "REQUEST_VERIFY"},
{0,NULL}
};

473
crypto/ocsp/ocsp_ht.c
View File

@@ -1,9 +1,9 @@
/* ocsp_ht.c */
/* Written by Dr Stephen N Henson (shenson@bigfoot.com) for the OpenSSL
* project 2000.
* project 2006.
*/
/* ====================================================================
* Copyright (c) 2000 The OpenSSL Project. All rights reserved.
* 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
@@ -68,106 +68,405 @@
#define strtoul (unsigned long)strtol
#endif /* OPENSSL_SYS_SUNOS */
/* Quick and dirty HTTP OCSP request handler.
* Could make this a bit cleverer by adding
* support for non blocking BIOs and a few
* other refinements.
/* 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.
*/
OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
{
BIO *mem = NULL;
char tmpbuf[1024];
OCSP_RESPONSE *resp = NULL;
static int parse_http_line1(char *line)
{
int retcode;
char *p, *q, *r;
int len, retcode;
static char req_txt[] =
"POST %s HTTP/1.0\r\n\
Content-Type: application/ocsp-request\r\n\
Content-Length: %d\r\n\r\n";
len = i2d_OCSP_REQUEST(req, NULL);
if(BIO_printf(b, req_txt, path, len) < 0) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_WRITE_ERROR);
goto err;
}
if(i2d_OCSP_REQUEST_bio(b, req) <= 0) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_WRITE_ERROR);
goto err;
}
if(!(mem = BIO_new(BIO_s_mem()))) goto err;
/* Copy response to a memory BIO: socket bios can't do gets! */
while ((len = BIO_read(b, tmpbuf, sizeof tmpbuf))) {
if(len < 0) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_READ_ERROR);
goto err;
}
BIO_write(mem, tmpbuf, len);
}
if(BIO_gets(mem, tmpbuf, 512) <= 0) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
goto err;
}
/* 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.
*/
/* Skip to first white space (passed protocol info) */
for(p = tmpbuf; *p && !isspace((unsigned char)*p); p++) continue;
if(!*p) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
goto err;
}
for(p = line; *p && !isspace((unsigned char)*p); p++)
continue;
if(!*p)
{
OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO,
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_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
goto err;
}
while(*p && isspace((unsigned char)*p))
p++;
if(!*p)
{
OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO,
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_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
goto err;
}
for(q = p; *q && !isspace((unsigned char)*q); q++)
continue;
if(!*q)
{
OCSPerr(OCSP_F_OCSP_SENDREQ_NBIO,
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) goto err;
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_OCSP_SENDREQ_BIO,OCSP_R_SERVER_RESPONSE_ERROR);
if(!*q) {
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_OCSP_SENDREQ_NBIO, OCSP_R_SERVER_RESPONSE_ERROR);
if(!*q)
ERR_add_error_data(2, "Code=", p);
}
else {
else
ERR_add_error_data(4, "Code=", p, ",Reason=", q);
return 0;
}
goto err;
return 1;
}
/* Find blank line marking beginning of content */
while(BIO_gets(mem, tmpbuf, 512) > 0)
int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
{
for(p = tmpbuf; *p && isspace((unsigned char)*p); p++) continue;
if(!*p) break;
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;
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 < 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;
}
if(*p) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,OCSP_R_NO_CONTENT);
goto err;
/* 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;
}
if(!(resp = d2i_OCSP_RESPONSE_bio(mem, NULL))) {
OCSPerr(OCSP_F_OCSP_SENDREQ_BIO,ERR_R_NESTED_ASN1_ERROR);
goto err;
}
err:
BIO_free(mem);
return resp;
}

2
crypto/ossl_typ.h
View File

@@ -181,4 +181,6 @@ typedef void CRYPTO_EX_free(void *parent, void *ptr, CRYPTO_EX_DATA *ad,
typedef int CRYPTO_EX_dup(CRYPTO_EX_DATA *to, CRYPTO_EX_DATA *from, void *from_d,
int idx, long argl, void *argp);
typedef struct ocsp_req_ctx_st OCSP_REQ_CTX;
#endif /* def HEADER_OPENSSL_TYPES_H */