2 * Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
15 #include <openssl/asn1.h>
16 #include <openssl/ocsp.h>
17 #include <openssl/err.h>
18 #include <openssl/buffer.h>
20 /* Stateful OCSP request code, supporting non-blocking I/O */
22 /* Opaque OCSP request status structure */
24 struct ocsp_req_ctx_st
{
25 int state
; /* Current I/O state */
26 unsigned char *iobuf
; /* Line buffer */
27 int iobuflen
; /* Line buffer length */
28 BIO
*io
; /* BIO to perform I/O with */
29 BIO
*mem
; /* Memory BIO response is built into */
30 unsigned long asn1_len
; /* ASN1 length of response */
31 unsigned long max_resp_len
; /* Maximum length of response */
34 #define OCSP_MAX_RESP_LENGTH (100 * 1024)
35 #define OCSP_MAX_LINE_LEN 4096;
39 /* If set no reading should be performed */
40 #define OHS_NOREAD 0x1000
42 #define OHS_ERROR (0 | OHS_NOREAD)
43 /* First line being read */
44 #define OHS_FIRSTLINE 1
45 /* MIME headers being read */
47 /* OCSP initial header (tag + length) being read */
48 #define OHS_ASN1_HEADER 3
49 /* OCSP content octets being read */
50 #define OHS_ASN1_CONTENT 4
51 /* First call: ready to start I/O */
52 #define OHS_ASN1_WRITE_INIT (5 | OHS_NOREAD)
53 /* Request being sent */
54 #define OHS_ASN1_WRITE (6 | OHS_NOREAD)
55 /* Request being flushed */
56 #define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
58 #define OHS_DONE (8 | OHS_NOREAD)
59 /* Headers set, no final \r\n included */
60 #define OHS_HTTP_HEADER (9 | OHS_NOREAD)
62 static int parse_http_line1(char *line
);
64 OCSP_REQ_CTX
*OCSP_REQ_CTX_new(BIO
*io
, int maxline
)
66 OCSP_REQ_CTX
*rctx
= OPENSSL_zalloc(sizeof(*rctx
));
70 rctx
->state
= OHS_ERROR
;
71 rctx
->max_resp_len
= OCSP_MAX_RESP_LENGTH
;
72 rctx
->mem
= BIO_new(BIO_s_mem());
75 rctx
->iobuflen
= maxline
;
77 rctx
->iobuflen
= OCSP_MAX_LINE_LEN
;
78 rctx
->iobuf
= OPENSSL_malloc(rctx
->iobuflen
);
79 if (rctx
->iobuf
== NULL
|| rctx
->mem
== NULL
) {
80 OCSP_REQ_CTX_free(rctx
);
86 void OCSP_REQ_CTX_free(OCSP_REQ_CTX
*rctx
)
91 OPENSSL_free(rctx
->iobuf
);
95 BIO
*OCSP_REQ_CTX_get0_mem_bio(OCSP_REQ_CTX
*rctx
)
100 void OCSP_set_max_response_length(OCSP_REQ_CTX
*rctx
, unsigned long len
)
103 rctx
->max_resp_len
= OCSP_MAX_RESP_LENGTH
;
105 rctx
->max_resp_len
= len
;
108 int OCSP_REQ_CTX_i2d(OCSP_REQ_CTX
*rctx
, const ASN1_ITEM
*it
, ASN1_VALUE
*val
)
110 static const char req_hdr
[] =
111 "Content-Type: application/ocsp-request\r\n"
112 "Content-Length: %d\r\n\r\n";
113 int reqlen
= ASN1_item_i2d(val
, NULL
, it
);
114 if (BIO_printf(rctx
->mem
, req_hdr
, reqlen
) <= 0)
116 if (ASN1_item_i2d_bio(it
, rctx
->mem
, val
) <= 0)
118 rctx
->state
= OHS_ASN1_WRITE_INIT
;
122 int OCSP_REQ_CTX_nbio_d2i(OCSP_REQ_CTX
*rctx
,
123 ASN1_VALUE
**pval
, const ASN1_ITEM
*it
)
126 const unsigned char *p
;
128 rv
= OCSP_REQ_CTX_nbio(rctx
);
132 len
= BIO_get_mem_data(rctx
->mem
, &p
);
133 *pval
= ASN1_item_d2i(NULL
, &p
, len
, it
);
135 rctx
->state
= OHS_ERROR
;
141 int OCSP_REQ_CTX_http(OCSP_REQ_CTX
*rctx
, const char *op
, const char *path
)
143 static const char http_hdr
[] = "%s %s HTTP/1.0\r\n";
148 if (BIO_printf(rctx
->mem
, http_hdr
, op
, path
) <= 0)
150 rctx
->state
= OHS_HTTP_HEADER
;
154 int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX
*rctx
, OCSP_REQUEST
*req
)
156 return OCSP_REQ_CTX_i2d(rctx
, ASN1_ITEM_rptr(OCSP_REQUEST
),
160 int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX
*rctx
,
161 const char *name
, const char *value
)
165 if (BIO_puts(rctx
->mem
, name
) <= 0)
168 if (BIO_write(rctx
->mem
, ": ", 2) != 2)
170 if (BIO_puts(rctx
->mem
, value
) <= 0)
173 if (BIO_write(rctx
->mem
, "\r\n", 2) != 2)
175 rctx
->state
= OHS_HTTP_HEADER
;
179 OCSP_REQ_CTX
*OCSP_sendreq_new(BIO
*io
, const char *path
, OCSP_REQUEST
*req
,
183 OCSP_REQ_CTX
*rctx
= NULL
;
184 rctx
= OCSP_REQ_CTX_new(io
, maxline
);
188 if (!OCSP_REQ_CTX_http(rctx
, "POST", path
))
191 if (req
&& !OCSP_REQ_CTX_set1_req(rctx
, req
))
197 OCSP_REQ_CTX_free(rctx
);
202 * Parse the HTTP response. This will look like this: "HTTP/1.0 200 OK". We
203 * need to obtain the numeric code and (optional) informational message.
206 static int parse_http_line1(char *line
)
210 /* Skip to first white space (passed protocol info) */
212 for (p
= line
; *p
&& !isspace((unsigned char)*p
); p
++)
215 OCSPerr(OCSP_F_PARSE_HTTP_LINE1
, OCSP_R_SERVER_RESPONSE_PARSE_ERROR
);
219 /* Skip past white space to start of response code */
220 while (*p
&& isspace((unsigned char)*p
))
224 OCSPerr(OCSP_F_PARSE_HTTP_LINE1
, OCSP_R_SERVER_RESPONSE_PARSE_ERROR
);
228 /* Find end of response code: first whitespace after start of code */
229 for (q
= p
; *q
&& !isspace((unsigned char)*q
); q
++)
233 OCSPerr(OCSP_F_PARSE_HTTP_LINE1
, OCSP_R_SERVER_RESPONSE_PARSE_ERROR
);
237 /* Set end of response code and start of message */
240 /* Attempt to parse numeric code */
241 retcode
= strtoul(p
, &r
, 10);
246 /* Skip over any leading white space in message */
247 while (*q
&& isspace((unsigned char)*q
))
252 * Finally zap any trailing white space in message (include CRLF)
255 /* We know q has a non white space character so this is OK */
256 for (r
= q
+ strlen(q
) - 1; isspace((unsigned char)*r
); r
--)
259 if (retcode
!= 200) {
260 OCSPerr(OCSP_F_PARSE_HTTP_LINE1
, OCSP_R_SERVER_RESPONSE_ERROR
);
262 ERR_add_error_data(2, "Code=", p
);
264 ERR_add_error_data(4, "Code=", p
, ",Reason=", q
);
272 int OCSP_REQ_CTX_nbio(OCSP_REQ_CTX
*rctx
)
275 const unsigned char *p
;
277 if (!(rctx
->state
& OHS_NOREAD
)) {
278 n
= BIO_read(rctx
->io
, rctx
->iobuf
, rctx
->iobuflen
);
281 if (BIO_should_retry(rctx
->io
))
286 /* Write data to memory BIO */
288 if (BIO_write(rctx
->mem
, rctx
->iobuf
, n
) != n
)
292 switch (rctx
->state
) {
293 case OHS_HTTP_HEADER
:
294 /* Last operation was adding headers: need a final \r\n */
295 if (BIO_write(rctx
->mem
, "\r\n", 2) != 2) {
296 rctx
->state
= OHS_ERROR
;
299 rctx
->state
= OHS_ASN1_WRITE_INIT
;
301 case OHS_ASN1_WRITE_INIT
:
302 rctx
->asn1_len
= BIO_get_mem_data(rctx
->mem
, NULL
);
303 rctx
->state
= OHS_ASN1_WRITE
;
306 n
= BIO_get_mem_data(rctx
->mem
, &p
);
308 i
= BIO_write(rctx
->io
, p
+ (n
- rctx
->asn1_len
), rctx
->asn1_len
);
311 if (BIO_should_retry(rctx
->io
))
313 rctx
->state
= OHS_ERROR
;
319 if (rctx
->asn1_len
> 0)
322 rctx
->state
= OHS_ASN1_FLUSH
;
324 (void)BIO_reset(rctx
->mem
);
328 i
= BIO_flush(rctx
->io
);
331 rctx
->state
= OHS_FIRSTLINE
;
335 if (BIO_should_retry(rctx
->io
))
338 rctx
->state
= OHS_ERROR
;
347 /* Attempt to read a line in */
351 * Due to &%^*$" memory BIO behaviour with BIO_gets we have to check
352 * there's a complete line in there before calling BIO_gets or we'll
353 * just get a partial read.
355 n
= BIO_get_mem_data(rctx
->mem
, &p
);
356 if ((n
<= 0) || !memchr(p
, '\n', n
)) {
357 if (n
>= rctx
->iobuflen
) {
358 rctx
->state
= OHS_ERROR
;
363 n
= BIO_gets(rctx
->mem
, (char *)rctx
->iobuf
, rctx
->iobuflen
);
366 if (BIO_should_retry(rctx
->mem
))
368 rctx
->state
= OHS_ERROR
;
372 /* Don't allow excessive lines */
373 if (n
== rctx
->iobuflen
) {
374 rctx
->state
= OHS_ERROR
;
379 if (rctx
->state
== OHS_FIRSTLINE
) {
380 if (parse_http_line1((char *)rctx
->iobuf
)) {
381 rctx
->state
= OHS_HEADERS
;
384 rctx
->state
= OHS_ERROR
;
388 /* Look for blank line: end of headers */
389 for (p
= rctx
->iobuf
; *p
; p
++) {
390 if ((*p
!= '\r') && (*p
!= '\n'))
396 rctx
->state
= OHS_ASN1_HEADER
;
402 case OHS_ASN1_HEADER
:
404 * Now reading ASN1 header: can read at least 2 bytes which is enough
405 * for ASN1 SEQUENCE header and either length field or at least the
406 * length of the length field.
408 n
= BIO_get_mem_data(rctx
->mem
, &p
);
412 /* Check it is an ASN1 SEQUENCE */
413 if (*p
++ != (V_ASN1_SEQUENCE
| V_ASN1_CONSTRUCTED
)) {
414 rctx
->state
= OHS_ERROR
;
418 /* Check out length field */
421 * If MSB set on initial length octet we can now always read 6
422 * octets: make sure we have them.
427 /* Not NDEF or excessive length */
429 rctx
->state
= OHS_ERROR
;
434 for (i
= 0; i
< n
; i
++) {
435 rctx
->asn1_len
<<= 8;
436 rctx
->asn1_len
|= *p
++;
439 if (rctx
->asn1_len
> rctx
->max_resp_len
) {
440 rctx
->state
= OHS_ERROR
;
444 rctx
->asn1_len
+= n
+ 2;
446 rctx
->asn1_len
= *p
+ 2;
448 rctx
->state
= OHS_ASN1_CONTENT
;
452 case OHS_ASN1_CONTENT
:
453 n
= BIO_get_mem_data(rctx
->mem
, NULL
);
454 if (n
< (int)rctx
->asn1_len
)
457 rctx
->state
= OHS_DONE
;
469 int OCSP_sendreq_nbio(OCSP_RESPONSE
**presp
, OCSP_REQ_CTX
*rctx
)
471 return OCSP_REQ_CTX_nbio_d2i(rctx
,
472 (ASN1_VALUE
**)presp
,
473 ASN1_ITEM_rptr(OCSP_RESPONSE
));
476 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
478 OCSP_RESPONSE
*OCSP_sendreq_bio(BIO
*b
, const char *path
, OCSP_REQUEST
*req
)
480 OCSP_RESPONSE
*resp
= NULL
;
484 ctx
= OCSP_sendreq_new(b
, path
, req
, -1);
490 rv
= OCSP_sendreq_nbio(&resp
, ctx
);
491 } while ((rv
== -1) && BIO_should_retry(b
));
493 OCSP_REQ_CTX_free(ctx
);