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 */
85 #define OCSP_MAX_REQUEST_LENGTH (100 * 1024)
86 #define OCSP_MAX_LINE_LEN 4096;
90 /* If set no reading should be performed */
91 #define OHS_NOREAD 0x1000
93 #define OHS_ERROR (0 | OHS_NOREAD)
94 /* First line being read */
95 #define OHS_FIRSTLINE 1
96 /* MIME headers being read */
98 /* OCSP initial header (tag + length) being read */
99 #define OHS_ASN1_HEADER 3
100 /* OCSP content octets being read */
101 #define OHS_ASN1_CONTENT 4
102 /* Request being sent */
103 #define OHS_ASN1_WRITE (6 | OHS_NOREAD)
104 /* Request being flushed */
105 #define OHS_ASN1_FLUSH (7 | OHS_NOREAD)
107 #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)
144 if (BIO_write(rctx->mem, ": ", 2) != 2)
146 if (BIO_puts(rctx->mem, value) <= 0)
149 if (BIO_write(rctx->mem, "\r\n", 2) != 2)
154 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
157 static const char post_hdr[] = "POST %s HTTP/1.0\r\n";
160 rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
161 rctx->state = OHS_ERROR;
162 rctx->mem = BIO_new(BIO_s_mem());
166 rctx->iobuflen = maxline;
168 rctx->iobuflen = OCSP_MAX_LINE_LEN;
169 rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
175 if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
178 if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
184 /* Parse the HTTP response. This will look like this:
185 * "HTTP/1.0 200 OK". We need to obtain the numeric code and
186 * (optional) informational message.
189 static int parse_http_line1(char *line)
193 /* Skip to first white space (passed protocol info) */
195 for(p = line; *p && !isspace((unsigned char)*p); p++)
199 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
200 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
204 /* Skip past white space to start of response code */
205 while(*p && isspace((unsigned char)*p))
210 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
211 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++)
221 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
222 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
226 /* Set end of response code and start of message */
229 /* Attempt to parse numeric code */
230 retcode = strtoul(p, &r, 10);
235 /* Skip over any leading white space in message */
236 while(*q && isspace((unsigned char)*q))
241 /* Finally zap any trailing white space in message (include
244 /* We know q has a non white space character so this is OK */
245 for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
250 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
252 ERR_add_error_data(2, "Code=", p);
254 ERR_add_error_data(4, "Code=", p, ",Reason=", q);
263 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
266 const unsigned char *p;
268 if (!(rctx->state & OHS_NOREAD))
270 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
274 if (BIO_should_retry(rctx->io))
279 /* Write data to memory BIO */
281 if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
289 n = BIO_get_mem_data(rctx->mem, &p);
291 i = BIO_write(rctx->io,
292 p + (n - rctx->asn1_len), rctx->asn1_len);
296 if (BIO_should_retry(rctx->io))
298 rctx->state = OHS_ERROR;
304 if (rctx->asn1_len > 0)
307 rctx->state = OHS_ASN1_FLUSH;
309 (void)BIO_reset(rctx->mem);
313 i = BIO_flush(rctx->io);
317 rctx->state = OHS_FIRSTLINE;
321 if (BIO_should_retry(rctx->io))
324 rctx->state = OHS_ERROR;
333 /* Attempt to read a line in */
336 /* Due to &%^*$" memory BIO behaviour with BIO_gets we
337 * have to check there's a complete line in there before
338 * calling BIO_gets or we'll just get a partial read.
340 n = BIO_get_mem_data(rctx->mem, &p);
341 if ((n <= 0) || !memchr(p, '\n', n))
343 if (n >= rctx->iobuflen)
345 rctx->state = OHS_ERROR;
350 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
354 if (BIO_should_retry(rctx->mem))
356 rctx->state = OHS_ERROR;
360 /* Don't allow excessive lines */
361 if (n == rctx->iobuflen)
363 rctx->state = OHS_ERROR;
368 if (rctx->state == OHS_FIRSTLINE)
370 if (parse_http_line1((char *)rctx->iobuf))
372 rctx->state = OHS_HEADERS;
377 rctx->state = OHS_ERROR;
383 /* Look for blank line: end of headers */
384 for (p = rctx->iobuf; *p; p++)
386 if ((*p != '\r') && (*p != '\n'))
392 rctx->state = OHS_ASN1_HEADER;
399 case OHS_ASN1_HEADER:
400 /* Now reading ASN1 header: can read at least 2 bytes which
401 * is enough for ASN1 SEQUENCE header and either length field
402 * or at least the length of the length field.
404 n = BIO_get_mem_data(rctx->mem, &p);
408 /* Check it is an ASN1 SEQUENCE */
409 if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
411 rctx->state = OHS_ERROR;
415 /* Check out length field */
418 /* If MSB set on initial length octet we can now
419 * always read 6 octets: make sure we have them.
424 /* Not NDEF or excessive length */
427 rctx->state = OHS_ERROR;
432 for (i = 0; i < n; i++)
434 rctx->asn1_len <<= 8;
435 rctx->asn1_len |= *p++;
438 if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH)
440 rctx->state = OHS_ERROR;
444 rctx->asn1_len += n + 2;
447 rctx->asn1_len = *p + 2;
449 rctx->state = OHS_ASN1_CONTENT;
453 case OHS_ASN1_CONTENT:
454 n = BIO_get_mem_data(rctx->mem, &p);
455 if (n < (int)rctx->asn1_len)
459 *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
462 rctx->state = OHS_DONE;
466 rctx->state = OHS_ERROR;
483 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
485 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
487 OCSP_RESPONSE *resp = NULL;
491 ctx = OCSP_sendreq_new(b, path, req, -1);
495 rv = OCSP_sendreq_nbio(&resp, ctx);
496 } while ((rv == -1) && BIO_should_retry(b));
498 OCSP_REQ_CTX_free(ctx);