2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in
17 * the documentation and/or other materials provided with the
20 * 3. All advertising materials mentioning features or use of this
21 * software must display the following acknowledgment:
22 * "This product includes software developed by the OpenSSL Project
23 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 * endorse or promote products derived from this software without
27 * prior written permission. For written permission, please contact
28 * licensing@OpenSSL.org.
30 * 5. Products derived from this software may not be called "OpenSSL"
31 * nor may "OpenSSL" appear in their names without prior written
32 * permission of the OpenSSL Project.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com). This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
64 #include <openssl/asn1.h>
65 #include <openssl/ocsp.h>
66 #include <openssl/err.h>
67 #include <openssl/buffer.h>
68 #ifdef OPENSSL_SYS_SUNOS
69 #define strtoul (unsigned long)strtol
70 #endif /* OPENSSL_SYS_SUNOS */
72 /* Stateful OCSP request code, supporting non-blocking I/O */
74 /* Opaque OCSP request status structure */
76 struct ocsp_req_ctx_st {
77 int state; /* Current I/O state */
78 unsigned char *iobuf; /* Line buffer */
79 int iobuflen; /* Line buffer length */
80 BIO *io; /* BIO to perform I/O with */
81 BIO *mem; /* Memory BIO response is built into */
82 unsigned long asn1_len; /* ASN1 length of response */
83 unsigned long max_resp_len; /* Maximum length of response */
86 #define OCSP_MAX_RESP_LENGTH (100 * 1024)
87 #define OCSP_MAX_LINE_LEN 4096;
91 /* If set no reading should be performed */
92 #define OHS_NOREAD 0x1000
94 #define OHS_ERROR (0 | OHS_NOREAD)
95 /* First line being read */
96 #define OHS_FIRSTLINE 1
97 /* MIME headers being read */
99 /* OCSP initial header (tag + length) being read */
100 #define OHS_ASN1_HEADER 3
101 /* OCSP content octets being read */
102 #define OHS_ASN1_CONTENT 4
103 /* First call: ready to start I/O */
104 #define OHS_ASN1_WRITE_INIT (5 | OHS_NOREAD)
105 /* Request being sent */
106 #define OHS_ASN1_WRITE (6 | OHS_NOREAD)
107 /* Request being flushed */
108 #define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
110 #define OHS_DONE (8 | OHS_NOREAD)
111 /* Headers set, no final \r\n included */
112 #define OHS_HTTP_HEADER (9 | OHS_NOREAD)
115 static int parse_http_line1(char *line);
117 OCSP_REQ_CTX *OCSP_REQ_CTX_new(BIO *io, int maxline)
120 rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
123 rctx->state = OHS_ERROR;
124 rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
125 rctx->mem = BIO_new(BIO_s_mem());
129 rctx->iobuflen = maxline;
131 rctx->iobuflen = OCSP_MAX_LINE_LEN;
132 rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
133 if (!rctx->iobuf || !rctx->mem)
135 OCSP_REQ_CTX_free(rctx);
141 void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
146 OPENSSL_free(rctx->iobuf);
150 BIO *OCSP_REQ_CTX_get0_mem_bio(OCSP_REQ_CTX *rctx)
155 void OCSP_set_max_response_length(OCSP_REQ_CTX *rctx, unsigned long len)
158 rctx->max_resp_len = OCSP_MAX_RESP_LENGTH;
160 rctx->max_resp_len = len;
163 int OCSP_REQ_CTX_i2d(OCSP_REQ_CTX *rctx, const ASN1_ITEM *it, ASN1_VALUE *val)
165 static const char req_hdr[] =
166 "Content-Type: application/ocsp-request\r\n"
167 "Content-Length: %d\r\n\r\n";
168 int reqlen = ASN1_item_i2d(val, NULL, it);
169 if (BIO_printf(rctx->mem, req_hdr, reqlen) <= 0)
171 if (ASN1_item_i2d_bio(it, rctx->mem, val) <= 0)
173 rctx->state = OHS_ASN1_WRITE_INIT;
177 int OCSP_REQ_CTX_nbio_d2i(OCSP_REQ_CTX *rctx,
178 ASN1_VALUE **pval, const ASN1_ITEM *it)
181 const unsigned char *p;
183 rv = OCSP_REQ_CTX_nbio(rctx);
187 len = BIO_get_mem_data(rctx->mem, &p);
188 *pval = ASN1_item_d2i(NULL, &p, len, it);
191 rctx->state = OHS_ERROR;
197 int OCSP_REQ_CTX_http(OCSP_REQ_CTX *rctx, const char *op, const char *path)
199 static const char http_hdr[] = "%s %s HTTP/1.0\r\n";
204 if (BIO_printf(rctx->mem, http_hdr, op, path) <= 0)
206 rctx->state = OHS_HTTP_HEADER;
210 int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
212 return OCSP_REQ_CTX_i2d(rctx, ASN1_ITEM_rptr(OCSP_REQUEST),
216 int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
217 const char *name, const char *value)
221 if (BIO_puts(rctx->mem, name) <= 0)
225 if (BIO_write(rctx->mem, ": ", 2) != 2)
227 if (BIO_puts(rctx->mem, value) <= 0)
230 if (BIO_write(rctx->mem, "\r\n", 2) != 2)
232 rctx->state = OHS_HTTP_HEADER;
236 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, const char *path, OCSP_REQUEST *req,
240 OCSP_REQ_CTX *rctx = NULL;
241 rctx = OCSP_REQ_CTX_new(io, maxline);
245 if (!OCSP_REQ_CTX_http(rctx, "POST", path))
248 if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
254 OCSP_REQ_CTX_free(rctx);
258 /* Parse the HTTP response. This will look like this:
259 * "HTTP/1.0 200 OK". We need to obtain the numeric code and
260 * (optional) informational message.
263 static int parse_http_line1(char *line)
267 /* Skip to first white space (passed protocol info) */
269 for(p = line; *p && !isspace((unsigned char)*p); p++)
273 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
274 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
278 /* Skip past white space to start of response code */
279 while(*p && isspace((unsigned char)*p))
284 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
285 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
289 /* Find end of response code: first whitespace after start of code */
290 for(q = p; *q && !isspace((unsigned char)*q); q++)
295 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
296 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
300 /* Set end of response code and start of message */
303 /* Attempt to parse numeric code */
304 retcode = strtoul(p, &r, 10);
309 /* Skip over any leading white space in message */
310 while(*q && isspace((unsigned char)*q))
315 /* Finally zap any trailing white space in message (include
318 /* We know q has a non white space character so this is OK */
319 for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
324 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
326 ERR_add_error_data(2, "Code=", p);
328 ERR_add_error_data(4, "Code=", p, ",Reason=", q);
337 int OCSP_REQ_CTX_nbio(OCSP_REQ_CTX *rctx)
340 const unsigned char *p;
342 if (!(rctx->state & OHS_NOREAD))
344 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
348 if (BIO_should_retry(rctx->io))
353 /* Write data to memory BIO */
355 if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
361 case OHS_HTTP_HEADER:
362 /* Last operation was adding headers: need a final \r\n */
363 if (BIO_write(rctx->mem, "\r\n", 2) != 2)
365 rctx->state = OHS_ERROR;
368 rctx->state = OHS_ASN1_WRITE_INIT;
370 case OHS_ASN1_WRITE_INIT:
371 rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
372 rctx->state = OHS_ASN1_WRITE;
375 n = BIO_get_mem_data(rctx->mem, &p);
377 i = BIO_write(rctx->io,
378 p + (n - rctx->asn1_len), rctx->asn1_len);
382 if (BIO_should_retry(rctx->io))
384 rctx->state = OHS_ERROR;
390 if (rctx->asn1_len > 0)
393 rctx->state = OHS_ASN1_FLUSH;
395 (void)BIO_reset(rctx->mem);
399 i = BIO_flush(rctx->io);
403 rctx->state = OHS_FIRSTLINE;
407 if (BIO_should_retry(rctx->io))
410 rctx->state = OHS_ERROR;
419 /* Attempt to read a line in */
422 /* Due to &%^*$" memory BIO behaviour with BIO_gets we
423 * have to check there's a complete line in there before
424 * calling BIO_gets or we'll just get a partial read.
426 n = BIO_get_mem_data(rctx->mem, &p);
427 if ((n <= 0) || !memchr(p, '\n', n))
429 if (n >= rctx->iobuflen)
431 rctx->state = OHS_ERROR;
436 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
440 if (BIO_should_retry(rctx->mem))
442 rctx->state = OHS_ERROR;
446 /* Don't allow excessive lines */
447 if (n == rctx->iobuflen)
449 rctx->state = OHS_ERROR;
454 if (rctx->state == OHS_FIRSTLINE)
456 if (parse_http_line1((char *)rctx->iobuf))
458 rctx->state = OHS_HEADERS;
463 rctx->state = OHS_ERROR;
469 /* Look for blank line: end of headers */
470 for (p = rctx->iobuf; *p; p++)
472 if ((*p != '\r') && (*p != '\n'))
478 rctx->state = OHS_ASN1_HEADER;
485 case OHS_ASN1_HEADER:
486 /* Now reading ASN1 header: can read at least 2 bytes which
487 * is enough for ASN1 SEQUENCE header and either length field
488 * or at least the length of the length field.
490 n = BIO_get_mem_data(rctx->mem, &p);
494 /* Check it is an ASN1 SEQUENCE */
495 if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
497 rctx->state = OHS_ERROR;
501 /* Check out length field */
504 /* If MSB set on initial length octet we can now
505 * always read 6 octets: make sure we have them.
510 /* Not NDEF or excessive length */
513 rctx->state = OHS_ERROR;
518 for (i = 0; i < n; i++)
520 rctx->asn1_len <<= 8;
521 rctx->asn1_len |= *p++;
524 if (rctx->asn1_len > rctx->max_resp_len)
526 rctx->state = OHS_ERROR;
530 rctx->asn1_len += n + 2;
533 rctx->asn1_len = *p + 2;
535 rctx->state = OHS_ASN1_CONTENT;
539 case OHS_ASN1_CONTENT:
540 n = BIO_get_mem_data(rctx->mem, NULL);
541 if (n < (int)rctx->asn1_len)
544 rctx->state = OHS_DONE;
558 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
560 return OCSP_REQ_CTX_nbio_d2i(rctx,
561 (ASN1_VALUE **)presp, ASN1_ITEM_rptr(OCSP_RESPONSE));
564 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
566 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, const char *path, OCSP_REQUEST *req)
568 OCSP_RESPONSE *resp = NULL;
572 ctx = OCSP_sendreq_new(b, path, req, -1);
579 rv = OCSP_sendreq_nbio(&resp, ctx);
580 } while ((rv == -1) && BIO_should_retry(b));
582 OCSP_REQ_CTX_free(ctx);