3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
65 #include <openssl/asn1.h>
66 #include <openssl/ocsp.h>
67 #include <openssl/err.h>
68 #include <openssl/buffer.h>
69 #ifdef OPENSSL_SYS_SUNOS
70 # define strtoul (unsigned long)strtol
71 #endif /* OPENSSL_SYS_SUNOS */
73 /* Stateful OCSP request code, supporting non-blocking I/O */
75 /* Opaque OCSP request status structure */
77 struct ocsp_req_ctx_st {
78 int state; /* Current I/O state */
79 unsigned char *iobuf; /* Line buffer */
80 int iobuflen; /* Line buffer length */
81 BIO *io; /* BIO to perform I/O with */
82 BIO *mem; /* Memory BIO response is built into */
83 unsigned long asn1_len; /* ASN1 length of response */
86 #define OCSP_MAX_REQUEST_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 /* Request being sent */
104 #define OHS_ASN1_WRITE (6 | OHS_NOREAD)
105 /* Request being flushed */
106 #define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
108 #define OHS_DONE (8 | OHS_NOREAD)
110 static int parse_http_line1(char *line);
112 void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
117 OPENSSL_free(rctx->iobuf);
121 int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
123 static const char req_hdr[] =
124 "Content-Type: application/ocsp-request\r\n"
125 "Content-Length: %d\r\n\r\n";
126 if (BIO_printf(rctx->mem, req_hdr, i2d_OCSP_REQUEST(req, NULL)) <= 0)
128 if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0)
130 rctx->state = OHS_ASN1_WRITE;
131 rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
135 int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
136 const char *name, const char *value)
140 if (BIO_puts(rctx->mem, name) <= 0)
143 if (BIO_write(rctx->mem, ": ", 2) != 2)
145 if (BIO_puts(rctx->mem, value) <= 0)
148 if (BIO_write(rctx->mem, "\r\n", 2) != 2)
153 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
156 static const char post_hdr[] = "POST %s HTTP/1.0\r\n";
159 rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
162 rctx->state = OHS_ERROR;
163 rctx->mem = BIO_new(BIO_s_mem());
167 rctx->iobuflen = maxline;
169 rctx->iobuflen = OCSP_MAX_LINE_LEN;
170 rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
171 if (!rctx->mem || !rctx->iobuf)
176 if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
179 if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
184 OCSP_REQ_CTX_free(rctx);
189 * Parse the HTTP response. This will look like this: "HTTP/1.0 200 OK". We
190 * need to obtain the numeric code and (optional) informational message.
193 static int parse_http_line1(char *line)
197 /* Skip to first white space (passed protocol info) */
199 for (p = line; *p && !isspace((unsigned char)*p); p++)
202 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
206 /* Skip past white space to start of response code */
207 while (*p && isspace((unsigned char)*p))
211 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
215 /* Find end of response code: first whitespace after start of code */
216 for (q = p; *q && !isspace((unsigned char)*q); q++)
220 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
224 /* Set end of response code and start of message */
227 /* Attempt to parse numeric code */
228 retcode = strtoul(p, &r, 10);
233 /* Skip over any leading white space in message */
234 while (*q && isspace((unsigned char)*q))
239 * Finally zap any trailing white space in message (include CRLF)
242 /* We know q has a non white space character so this is OK */
243 for (r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
246 if (retcode != 200) {
247 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
249 ERR_add_error_data(2, "Code=", p);
251 ERR_add_error_data(4, "Code=", p, ",Reason=", q);
259 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
262 const unsigned char *p;
264 if (!(rctx->state & OHS_NOREAD)) {
265 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
268 if (BIO_should_retry(rctx->io))
273 /* Write data to memory BIO */
275 if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
279 switch (rctx->state) {
282 n = BIO_get_mem_data(rctx->mem, &p);
284 i = BIO_write(rctx->io, p + (n - rctx->asn1_len), rctx->asn1_len);
287 if (BIO_should_retry(rctx->io))
289 rctx->state = OHS_ERROR;
295 if (rctx->asn1_len > 0)
298 rctx->state = OHS_ASN1_FLUSH;
300 (void)BIO_reset(rctx->mem);
304 i = BIO_flush(rctx->io);
307 rctx->state = OHS_FIRSTLINE;
311 if (BIO_should_retry(rctx->io))
314 rctx->state = OHS_ERROR;
323 /* Attempt to read a line in */
327 * Due to &%^*$" memory BIO behaviour with BIO_gets we have to check
328 * there's a complete line in there before calling BIO_gets or we'll
329 * just get a partial read.
331 n = BIO_get_mem_data(rctx->mem, &p);
332 if ((n <= 0) || !memchr(p, '\n', n)) {
333 if (n >= rctx->iobuflen) {
334 rctx->state = OHS_ERROR;
339 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
342 if (BIO_should_retry(rctx->mem))
344 rctx->state = OHS_ERROR;
348 /* Don't allow excessive lines */
349 if (n == rctx->iobuflen) {
350 rctx->state = OHS_ERROR;
355 if (rctx->state == OHS_FIRSTLINE) {
356 if (parse_http_line1((char *)rctx->iobuf)) {
357 rctx->state = OHS_HEADERS;
360 rctx->state = OHS_ERROR;
364 /* Look for blank line: end of headers */
365 for (p = rctx->iobuf; *p; p++) {
366 if ((*p != '\r') && (*p != '\n'))
372 rctx->state = OHS_ASN1_HEADER;
378 case OHS_ASN1_HEADER:
380 * Now reading ASN1 header: can read at least 2 bytes which is enough
381 * for ASN1 SEQUENCE header and either length field or at least the
382 * length of the length field.
384 n = BIO_get_mem_data(rctx->mem, &p);
388 /* Check it is an ASN1 SEQUENCE */
389 if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
390 rctx->state = OHS_ERROR;
394 /* Check out length field */
397 * If MSB set on initial length octet we can now always read 6
398 * octets: make sure we have them.
403 /* Not NDEF or excessive length */
405 rctx->state = OHS_ERROR;
410 for (i = 0; i < n; i++) {
411 rctx->asn1_len <<= 8;
412 rctx->asn1_len |= *p++;
415 if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH) {
416 rctx->state = OHS_ERROR;
420 rctx->asn1_len += n + 2;
422 rctx->asn1_len = *p + 2;
424 rctx->state = OHS_ASN1_CONTENT;
428 case OHS_ASN1_CONTENT:
429 n = BIO_get_mem_data(rctx->mem, &p);
430 if (n < (int)rctx->asn1_len)
433 *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
435 rctx->state = OHS_DONE;
439 rctx->state = OHS_ERROR;
453 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
455 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
457 OCSP_RESPONSE *resp = NULL;
461 ctx = OCSP_sendreq_new(b, path, req, -1);
467 rv = OCSP_sendreq_nbio(&resp, ctx);
468 } while ((rv == -1) && BIO_should_retry(b));
470 OCSP_REQ_CTX_free(ctx);