1 /* ocsp_ht.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2006.
4 */
5 /* ====================================================================
6 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 *
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
18 * distribution.
19 *
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/)"
24 *
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.
29 *
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.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 * acknowledgment:
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
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 * ====================================================================
52 *
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).
56 *
57 */
58
59 #include <stdio.h>
60 #include <stdlib.h>
61 #include <ctype.h>
62 #include <string.h>
63 #include "e_os.h"
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 */
71
72 /* Stateful OCSP request code, supporting non-blocking I/O */
73
74 /* Opaque OCSP request status structure */
75
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 };
84
85 #define OCSP_MAX_REQUEST_LENGTH (100 * 1024)
86 #define OCSP_MAX_LINE_LEN 4096;
87
88 /* OCSP states */
89
90 /* If set no reading should be performed */
91 #define OHS_NOREAD 0x1000
92 /* Error condition */
93 #define OHS_ERROR (0 | OHS_NOREAD)
94 /* First line being read */
95 #define OHS_FIRSTLINE 1
96 /* MIME headers being read */
97 #define OHS_HEADERS 2
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)
106 /* Completed */
107 #define OHS_DONE (8 | OHS_NOREAD)
108
109
110 static int parse_http_line1(char *line);
111
112 void OCSP_REQ_CTX_free(OCSP_REQ_CTX *rctx)
113 {
114 if (rctx->mem)
115 BIO_free(rctx->mem);
116 if (rctx->iobuf)
117 OPENSSL_free(rctx->iobuf);
118 OPENSSL_free(rctx);
119 }
120
121 int OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX *rctx, OCSP_REQUEST *req)
122 {
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)
127 return 0;
128 if (i2d_OCSP_REQUEST_bio(rctx->mem, req) <= 0)
129 return 0;
130 rctx->state = OHS_ASN1_WRITE;
131 rctx->asn1_len = BIO_get_mem_data(rctx->mem, NULL);
132 return 1;
133 }
134
135 int OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX *rctx,
136 const char *name, const char *value)
137 {
138 if (!name)
139 return 0;
140 if (BIO_puts(rctx->mem, name) <= 0)
141 return 0;
142 if (value)
143 {
144 if (BIO_write(rctx->mem, ": ", 2) != 2)
145 return 0;
146 if (BIO_puts(rctx->mem, value) <= 0)
147 return 0;
148 }
149 if (BIO_write(rctx->mem, "\r\n", 2) != 2)
150 return 0;
151 return 1;
152 }
153
154 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
155 int maxline)
156 {
157 static const char post_hdr[] = "POST %s HTTP/1.0\r\n";
158
159 OCSP_REQ_CTX *rctx;
160 rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
161 if (!rctx)
162 return NULL;
163 rctx->state = OHS_ERROR;
164 rctx->mem = BIO_new(BIO_s_mem());
165 rctx->io = io;
166 rctx->asn1_len = 0;
167 if (maxline > 0)
168 rctx->iobuflen = maxline;
169 else
170 rctx->iobuflen = OCSP_MAX_LINE_LEN;
171 rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
172 if (!rctx->mem || !rctx->iobuf)
173 goto err;
174 if (!path)
175 path = "/";
176
177 if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
178 goto err;
179
180 if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
181 goto err;
182
183 return rctx;
184 err:
185 OCSP_REQ_CTX_free(rctx);
186 return NULL;
187 }
188
189 /* Parse the HTTP response. This will look like this:
190 * "HTTP/1.0 200 OK". We need to obtain the numeric code and
191 * (optional) informational message.
192 */
193
194 static int parse_http_line1(char *line)
195 {
196 int retcode;
197 char *p, *q, *r;
198 /* Skip to first white space (passed protocol info) */
199
200 for(p = line; *p && !isspace((unsigned char)*p); p++)
201 continue;
202 if(!*p)
203 {
204 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
205 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
206 return 0;
207 }
208
209 /* Skip past white space to start of response code */
210 while(*p && isspace((unsigned char)*p))
211 p++;
212
213 if(!*p)
214 {
215 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
216 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
217 return 0;
218 }
219
220 /* Find end of response code: first whitespace after start of code */
221 for(q = p; *q && !isspace((unsigned char)*q); q++)
222 continue;
223
224 if(!*q)
225 {
226 OCSPerr(OCSP_F_PARSE_HTTP_LINE1,
227 OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
228 return 0;
229 }
230
231 /* Set end of response code and start of message */
232 *q++ = 0;
233
234 /* Attempt to parse numeric code */
235 retcode = strtoul(p, &r, 10);
236
237 if(*r)
238 return 0;
239
240 /* Skip over any leading white space in message */
241 while(*q && isspace((unsigned char)*q))
242 q++;
243
244 if(*q)
245 {
246 /* Finally zap any trailing white space in message (include
247 * CRLF) */
248
249 /* We know q has a non white space character so this is OK */
250 for(r = q + strlen(q) - 1; isspace((unsigned char)*r); r--)
251 *r = 0;
252 }
253 if(retcode != 200)
254 {
255 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
256 if(!*q)
257 ERR_add_error_data(2, "Code=", p);
258 else
259 ERR_add_error_data(4, "Code=", p, ",Reason=", q);
260 return 0;
261 }
262
263
264 return 1;
265
266 }
267
268 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
269 {
270 int i, n;
271 const unsigned char *p;
272 next_io:
273 if (!(rctx->state & OHS_NOREAD))
274 {
275 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
276
277 if (n <= 0)
278 {
279 if (BIO_should_retry(rctx->io))
280 return -1;
281 return 0;
282 }
283
284 /* Write data to memory BIO */
285
286 if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
287 return 0;
288 }
289
290 switch(rctx->state)
291 {
292
293 case OHS_ASN1_WRITE:
294 n = BIO_get_mem_data(rctx->mem, &p);
295
296 i = BIO_write(rctx->io,
297 p + (n - rctx->asn1_len), rctx->asn1_len);
298
299 if (i <= 0)
300 {
301 if (BIO_should_retry(rctx->io))
302 return -1;
303 rctx->state = OHS_ERROR;
304 return 0;
305 }
306
307 rctx->asn1_len -= i;
308
309 if (rctx->asn1_len > 0)
310 goto next_io;
311
312 rctx->state = OHS_ASN1_FLUSH;
313
314 (void)BIO_reset(rctx->mem);
315
316 case OHS_ASN1_FLUSH:
317
318 i = BIO_flush(rctx->io);
319
320 if (i > 0)
321 {
322 rctx->state = OHS_FIRSTLINE;
323 goto next_io;
324 }
325
326 if (BIO_should_retry(rctx->io))
327 return -1;
328
329 rctx->state = OHS_ERROR;
330 return 0;
331
332 case OHS_ERROR:
333 return 0;
334
335 case OHS_FIRSTLINE:
336 case OHS_HEADERS:
337
338 /* Attempt to read a line in */
339
340 next_line:
341 /* Due to &%^*$" memory BIO behaviour with BIO_gets we
342 * have to check there's a complete line in there before
343 * calling BIO_gets or we'll just get a partial read.
344 */
345 n = BIO_get_mem_data(rctx->mem, &p);
346 if ((n <= 0) || !memchr(p, '\n', n))
347 {
348 if (n >= rctx->iobuflen)
349 {
350 rctx->state = OHS_ERROR;
351 return 0;
352 }
353 goto next_io;
354 }
355 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
356
357 if (n <= 0)
358 {
359 if (BIO_should_retry(rctx->mem))
360 goto next_io;
361 rctx->state = OHS_ERROR;
362 return 0;
363 }
364
365 /* Don't allow excessive lines */
366 if (n == rctx->iobuflen)
367 {
368 rctx->state = OHS_ERROR;
369 return 0;
370 }
371
372 /* First line */
373 if (rctx->state == OHS_FIRSTLINE)
374 {
375 if (parse_http_line1((char *)rctx->iobuf))
376 {
377 rctx->state = OHS_HEADERS;
378 goto next_line;
379 }
380 else
381 {
382 rctx->state = OHS_ERROR;
383 return 0;
384 }
385 }
386 else
387 {
388 /* Look for blank line: end of headers */
389 for (p = rctx->iobuf; *p; p++)
390 {
391 if ((*p != '\r') && (*p != '\n'))
392 break;
393 }
394 if (*p)
395 goto next_line;
396
397 rctx->state = OHS_ASN1_HEADER;
398
399 }
400
401 /* Fall thru */
402
403
404 case OHS_ASN1_HEADER:
405 /* Now reading ASN1 header: can read at least 2 bytes which
406 * is enough for ASN1 SEQUENCE header and either length field
407 * or at least the length of the length field.
408 */
409 n = BIO_get_mem_data(rctx->mem, &p);
410 if (n < 2)
411 goto next_io;
412
413 /* Check it is an ASN1 SEQUENCE */
414 if (*p++ != (V_ASN1_SEQUENCE|V_ASN1_CONSTRUCTED))
415 {
416 rctx->state = OHS_ERROR;
417 return 0;
418 }
419
420 /* Check out length field */
421 if (*p & 0x80)
422 {
423 /* If MSB set on initial length octet we can now
424 * always read 6 octets: make sure we have them.
425 */
426 if (n < 6)
427 goto next_io;
428 n = *p & 0x7F;
429 /* Not NDEF or excessive length */
430 if (!n || (n > 4))
431 {
432 rctx->state = OHS_ERROR;
433 return 0;
434 }
435 p++;
436 rctx->asn1_len = 0;
437 for (i = 0; i < n; i++)
438 {
439 rctx->asn1_len <<= 8;
440 rctx->asn1_len |= *p++;
441 }
442
443 if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH)
444 {
445 rctx->state = OHS_ERROR;
446 return 0;
447 }
448
449 rctx->asn1_len += n + 2;
450 }
451 else
452 rctx->asn1_len = *p + 2;
453
454 rctx->state = OHS_ASN1_CONTENT;
455
456 /* Fall thru */
457
458 case OHS_ASN1_CONTENT:
459 n = BIO_get_mem_data(rctx->mem, &p);
460 if (n < (int)rctx->asn1_len)
461 goto next_io;
462
463
464 *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
465 if (*presp)
466 {
467 rctx->state = OHS_DONE;
468 return 1;
469 }
470
471 rctx->state = OHS_ERROR;
472 return 0;
473
474 break;
475
476 case OHS_DONE:
477 return 1;
478
479 }
480
481
482
483 return 0;
484
485
486 }
487
488 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
489
490 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
491 {
492 OCSP_RESPONSE *resp = NULL;
493 OCSP_REQ_CTX *ctx;
494 int rv;
495
496 ctx = OCSP_sendreq_new(b, path, req, -1);
497
498 if (!ctx)
499 return NULL;
500
501 do
502 {
503 rv = OCSP_sendreq_nbio(&resp, ctx);
504 } while ((rv == -1) && BIO_should_retry(b));
505
506 OCSP_REQ_CTX_free(ctx);
507
508 if (rv)
509 return resp;
510
511 return NULL;
512 }