1 /* ocsp_ht.c */
2 /*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 2006.
5 */
6 /* ====================================================================
7 * Copyright (c) 2006 The OpenSSL Project. All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
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
19 * distribution.
20 *
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/)"
25 *
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.
30 *
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.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 * acknowledgment:
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
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 * ====================================================================
53 *
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).
57 *
58 */
59
60 #include <stdio.h>
61 #include <stdlib.h>
62 #include <ctype.h>
63 #include <string.h>
64 #include "e_os.h"
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 */
72
73 /* Stateful OCSP request code, supporting non-blocking I/O */
74
75 /* Opaque OCSP request status structure */
76
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 */
84 };
85
86 #define OCSP_MAX_REQUEST_LENGTH (100 * 1024)
87 #define OCSP_MAX_LINE_LEN 4096;
88
89 /* OCSP states */
90
91 /* If set no reading should be performed */
92 #define OHS_NOREAD 0x1000
93 /* Error condition */
94 #define OHS_ERROR (0 | OHS_NOREAD)
95 /* First line being read */
96 #define OHS_FIRSTLINE 1
97 /* MIME headers being read */
98 #define OHS_HEADERS 2
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)
107 /* Completed */
108 #define OHS_DONE (8 | OHS_NOREAD)
109
110 static int parse_http_line1(char *line);
111
OCSP_REQ_CTX_free(OCSP_REQ_CTX * rctx)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
OCSP_REQ_CTX_set1_req(OCSP_REQ_CTX * rctx,OCSP_REQUEST * req)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
OCSP_REQ_CTX_add1_header(OCSP_REQ_CTX * rctx,const char * name,const char * value)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 if (BIO_write(rctx->mem, ": ", 2) != 2)
144 return 0;
145 if (BIO_puts(rctx->mem, value) <= 0)
146 return 0;
147 }
148 if (BIO_write(rctx->mem, "\r\n", 2) != 2)
149 return 0;
150 return 1;
151 }
152
OCSP_sendreq_new(BIO * io,char * path,OCSP_REQUEST * req,int maxline)153 OCSP_REQ_CTX *OCSP_sendreq_new(BIO *io, char *path, OCSP_REQUEST *req,
154 int maxline)
155 {
156 static const char post_hdr[] = "POST %s HTTP/1.0\r\n";
157
158 OCSP_REQ_CTX *rctx;
159 rctx = OPENSSL_malloc(sizeof(OCSP_REQ_CTX));
160 if (!rctx)
161 return NULL;
162 rctx->state = OHS_ERROR;
163 rctx->mem = BIO_new(BIO_s_mem());
164 rctx->io = io;
165 rctx->asn1_len = 0;
166 if (maxline > 0)
167 rctx->iobuflen = maxline;
168 else
169 rctx->iobuflen = OCSP_MAX_LINE_LEN;
170 rctx->iobuf = OPENSSL_malloc(rctx->iobuflen);
171 if (!rctx->mem || !rctx->iobuf)
172 goto err;
173 if (!path)
174 path = "/";
175
176 if (BIO_printf(rctx->mem, post_hdr, path) <= 0)
177 goto err;
178
179 if (req && !OCSP_REQ_CTX_set1_req(rctx, req))
180 goto err;
181
182 return rctx;
183 err:
184 OCSP_REQ_CTX_free(rctx);
185 return NULL;
186 }
187
188 /*
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.
191 */
192
parse_http_line1(char * line)193 static int parse_http_line1(char *line)
194 {
195 int retcode;
196 char *p, *q, *r;
197 /* Skip to first white space (passed protocol info) */
198
199 for (p = line; *p && !isspace((unsigned char)*p); p++)
200 continue;
201 if (!*p) {
202 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
203 return 0;
204 }
205
206 /* Skip past white space to start of response code */
207 while (*p && isspace((unsigned char)*p))
208 p++;
209
210 if (!*p) {
211 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
212 return 0;
213 }
214
215 /* Find end of response code: first whitespace after start of code */
216 for (q = p; *q && !isspace((unsigned char)*q); q++)
217 continue;
218
219 if (!*q) {
220 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_PARSE_ERROR);
221 return 0;
222 }
223
224 /* Set end of response code and start of message */
225 *q++ = 0;
226
227 /* Attempt to parse numeric code */
228 retcode = strtoul(p, &r, 10);
229
230 if (*r)
231 return 0;
232
233 /* Skip over any leading white space in message */
234 while (*q && isspace((unsigned char)*q))
235 q++;
236
237 if (*q) {
238 /*
239 * Finally zap any trailing white space in message (include CRLF)
240 */
241
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--)
244 *r = 0;
245 }
246 if (retcode != 200) {
247 OCSPerr(OCSP_F_PARSE_HTTP_LINE1, OCSP_R_SERVER_RESPONSE_ERROR);
248 if (!*q)
249 ERR_add_error_data(2, "Code=", p);
250 else
251 ERR_add_error_data(4, "Code=", p, ",Reason=", q);
252 return 0;
253 }
254
255 return 1;
256
257 }
258
OCSP_sendreq_nbio(OCSP_RESPONSE ** presp,OCSP_REQ_CTX * rctx)259 int OCSP_sendreq_nbio(OCSP_RESPONSE **presp, OCSP_REQ_CTX *rctx)
260 {
261 int i, n;
262 const unsigned char *p;
263 next_io:
264 if (!(rctx->state & OHS_NOREAD)) {
265 n = BIO_read(rctx->io, rctx->iobuf, rctx->iobuflen);
266
267 if (n <= 0) {
268 if (BIO_should_retry(rctx->io))
269 return -1;
270 return 0;
271 }
272
273 /* Write data to memory BIO */
274
275 if (BIO_write(rctx->mem, rctx->iobuf, n) != n)
276 return 0;
277 }
278
279 switch (rctx->state) {
280
281 case OHS_ASN1_WRITE:
282 n = BIO_get_mem_data(rctx->mem, &p);
283
284 i = BIO_write(rctx->io, p + (n - rctx->asn1_len), rctx->asn1_len);
285
286 if (i <= 0) {
287 if (BIO_should_retry(rctx->io))
288 return -1;
289 rctx->state = OHS_ERROR;
290 return 0;
291 }
292
293 rctx->asn1_len -= i;
294
295 if (rctx->asn1_len > 0)
296 goto next_io;
297
298 rctx->state = OHS_ASN1_FLUSH;
299
300 (void)BIO_reset(rctx->mem);
301
302 case OHS_ASN1_FLUSH:
303
304 i = BIO_flush(rctx->io);
305
306 if (i > 0) {
307 rctx->state = OHS_FIRSTLINE;
308 goto next_io;
309 }
310
311 if (BIO_should_retry(rctx->io))
312 return -1;
313
314 rctx->state = OHS_ERROR;
315 return 0;
316
317 case OHS_ERROR:
318 return 0;
319
320 case OHS_FIRSTLINE:
321 case OHS_HEADERS:
322
323 /* Attempt to read a line in */
324
325 next_line:
326 /*
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.
330 */
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;
335 return 0;
336 }
337 goto next_io;
338 }
339 n = BIO_gets(rctx->mem, (char *)rctx->iobuf, rctx->iobuflen);
340
341 if (n <= 0) {
342 if (BIO_should_retry(rctx->mem))
343 goto next_io;
344 rctx->state = OHS_ERROR;
345 return 0;
346 }
347
348 /* Don't allow excessive lines */
349 if (n == rctx->iobuflen) {
350 rctx->state = OHS_ERROR;
351 return 0;
352 }
353
354 /* First line */
355 if (rctx->state == OHS_FIRSTLINE) {
356 if (parse_http_line1((char *)rctx->iobuf)) {
357 rctx->state = OHS_HEADERS;
358 goto next_line;
359 } else {
360 rctx->state = OHS_ERROR;
361 return 0;
362 }
363 } else {
364 /* Look for blank line: end of headers */
365 for (p = rctx->iobuf; *p; p++) {
366 if ((*p != '\r') && (*p != '\n'))
367 break;
368 }
369 if (*p)
370 goto next_line;
371
372 rctx->state = OHS_ASN1_HEADER;
373
374 }
375
376 /* Fall thru */
377
378 case OHS_ASN1_HEADER:
379 /*
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.
383 */
384 n = BIO_get_mem_data(rctx->mem, &p);
385 if (n < 2)
386 goto next_io;
387
388 /* Check it is an ASN1 SEQUENCE */
389 if (*p++ != (V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED)) {
390 rctx->state = OHS_ERROR;
391 return 0;
392 }
393
394 /* Check out length field */
395 if (*p & 0x80) {
396 /*
397 * If MSB set on initial length octet we can now always read 6
398 * octets: make sure we have them.
399 */
400 if (n < 6)
401 goto next_io;
402 n = *p & 0x7F;
403 /* Not NDEF or excessive length */
404 if (!n || (n > 4)) {
405 rctx->state = OHS_ERROR;
406 return 0;
407 }
408 p++;
409 rctx->asn1_len = 0;
410 for (i = 0; i < n; i++) {
411 rctx->asn1_len <<= 8;
412 rctx->asn1_len |= *p++;
413 }
414
415 if (rctx->asn1_len > OCSP_MAX_REQUEST_LENGTH) {
416 rctx->state = OHS_ERROR;
417 return 0;
418 }
419
420 rctx->asn1_len += n + 2;
421 } else
422 rctx->asn1_len = *p + 2;
423
424 rctx->state = OHS_ASN1_CONTENT;
425
426 /* Fall thru */
427
428 case OHS_ASN1_CONTENT:
429 n = BIO_get_mem_data(rctx->mem, &p);
430 if (n < (int)rctx->asn1_len)
431 goto next_io;
432
433 *presp = d2i_OCSP_RESPONSE(NULL, &p, rctx->asn1_len);
434 if (*presp) {
435 rctx->state = OHS_DONE;
436 return 1;
437 }
438
439 rctx->state = OHS_ERROR;
440 return 0;
441
442 break;
443
444 case OHS_DONE:
445 return 1;
446
447 }
448
449 return 0;
450
451 }
452
453 /* Blocking OCSP request handler: now a special case of non-blocking I/O */
454
OCSP_sendreq_bio(BIO * b,char * path,OCSP_REQUEST * req)455 OCSP_RESPONSE *OCSP_sendreq_bio(BIO *b, char *path, OCSP_REQUEST *req)
456 {
457 OCSP_RESPONSE *resp = NULL;
458 OCSP_REQ_CTX *ctx;
459 int rv;
460
461 ctx = OCSP_sendreq_new(b, path, req, -1);
462
463 if (!ctx)
464 return NULL;
465
466 do {
467 rv = OCSP_sendreq_nbio(&resp, ctx);
468 } while ((rv == -1) && BIO_should_retry(b));
469
470 OCSP_REQ_CTX_free(ctx);
471
472 if (rv)
473 return resp;
474
475 return NULL;
476 }
477