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1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2  * All rights reserved.
3  *
4  * This package is an SSL implementation written
5  * by Eric Young (eay@cryptsoft.com).
6  * The implementation was written so as to conform with Netscapes SSL.
7  *
8  * This library is free for commercial and non-commercial use as long as
9  * the following conditions are aheared to.  The following conditions
10  * apply to all code found in this distribution, be it the RC4, RSA,
11  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12  * included with this distribution is covered by the same copyright terms
13  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14  *
15  * Copyright remains Eric Young's, and as such any Copyright notices in
16  * the code are not to be removed.
17  * If this package is used in a product, Eric Young should be given attribution
18  * as the author of the parts of the library used.
19  * This can be in the form of a textual message at program startup or
20  * in documentation (online or textual) provided with the package.
21  *
22  * Redistribution and use in source and binary forms, with or without
23  * modification, are permitted provided that the following conditions
24  * are met:
25  * 1. Redistributions of source code must retain the copyright
26  *    notice, this list of conditions and the following disclaimer.
27  * 2. Redistributions in binary form must reproduce the above copyright
28  *    notice, this list of conditions and the following disclaimer in the
29  *    documentation and/or other materials provided with the distribution.
30  * 3. All advertising materials mentioning features or use of this software
31  *    must display the following acknowledgement:
32  *    "This product includes cryptographic software written by
33  *     Eric Young (eay@cryptsoft.com)"
34  *    The word 'cryptographic' can be left out if the rouines from the library
35  *    being used are not cryptographic related :-).
36  * 4. If you include any Windows specific code (or a derivative thereof) from
37  *    the apps directory (application code) you must include an acknowledgement:
38  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39  *
40  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50  * SUCH DAMAGE.
51  *
52  * The licence and distribution terms for any publically available version or
53  * derivative of this code cannot be changed.  i.e. this code cannot simply be
54  * copied and put under another distribution licence
55  * [including the GNU Public Licence.]
56  */
57 /* ====================================================================
58  * Copyright 2005 Nokia. All rights reserved.
59  *
60  * The portions of the attached software ("Contribution") is developed by
61  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
62  * license.
63  *
64  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
65  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
66  * support (see RFC 4279) to OpenSSL.
67  *
68  * No patent licenses or other rights except those expressly stated in
69  * the OpenSSL open source license shall be deemed granted or received
70  * expressly, by implication, estoppel, or otherwise.
71  *
72  * No assurances are provided by Nokia that the Contribution does not
73  * infringe the patent or other intellectual property rights of any third
74  * party or that the license provides you with all the necessary rights
75  * to make use of the Contribution.
76  *
77  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
78  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
79  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
80  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
81  * OTHERWISE. */
82 
83 #include <limits.h>
84 #include <string.h>
85 
86 #include <openssl/bytestring.h>
87 #include <openssl/err.h>
88 #include <openssl/mem.h>
89 #include <openssl/x509.h>
90 
91 #include "internal.h"
92 
93 
94 /* An SSL_SESSION is serialized as the following ASN.1 structure:
95  *
96  * SSLSession ::= SEQUENCE {
97  *     version                     INTEGER (1),  -- ignored
98  *     sslVersion                  INTEGER,      -- protocol version number
99  *     cipher                      OCTET STRING, -- two bytes long
100  *     sessionID                   OCTET STRING,
101  *     masterKey                   OCTET STRING,
102  *     time                    [1] INTEGER OPTIONAL, -- seconds since UNIX epoch
103  *     timeout                 [2] INTEGER OPTIONAL, -- in seconds
104  *     peer                    [3] Certificate OPTIONAL,
105  *     sessionIDContext        [4] OCTET STRING OPTIONAL,
106  *     verifyResult            [5] INTEGER OPTIONAL,  -- one of X509_V_* codes
107  *     hostName                [6] OCTET STRING OPTIONAL,
108  *                                 -- from server_name extension
109  *     pskIdentity             [8] OCTET STRING OPTIONAL,
110  *     ticketLifetimeHint      [9] INTEGER OPTIONAL,       -- client-only
111  *     ticket                  [10] OCTET STRING OPTIONAL, -- client-only
112  *     peerSHA256              [13] OCTET STRING OPTIONAL,
113  *     originalHandshakeHash   [14] OCTET STRING OPTIONAL,
114  *     signedCertTimestampList [15] OCTET STRING OPTIONAL,
115  *                                  -- contents of SCT extension
116  *     ocspResponse            [16] OCTET STRING OPTIONAL,
117  *                                   -- stapled OCSP response from the server
118  *     extendedMasterSecret    [17] BOOLEAN OPTIONAL,
119  * }
120  *
121  * Note: historically this serialization has included other optional
122  * fields. Their presense is currently treated as a parse error:
123  *
124  *     keyArg                  [0] IMPLICIT OCTET STRING OPTIONAL,
125  *     pskIdentityHint         [7] OCTET STRING OPTIONAL,
126  *     compressionMethod       [11] OCTET STRING OPTIONAL,
127  *     srpUsername             [12] OCTET STRING OPTIONAL, */
128 
129 static const int kTimeTag =
130     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 1;
131 static const int kTimeoutTag =
132     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 2;
133 static const int kPeerTag =
134     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 3;
135  static const int kSessionIDContextTag =
136     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 4;
137 static const int kVerifyResultTag =
138     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 5;
139 static const int kHostNameTag =
140     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 6;
141 static const int kPSKIdentityTag =
142     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 8;
143 static const int kTicketLifetimeHintTag =
144     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 9;
145 static const int kTicketTag =
146     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 10;
147 static const int kPeerSHA256Tag =
148     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 13;
149 static const int kOriginalHandshakeHashTag =
150     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 14;
151 static const int kSignedCertTimestampListTag =
152     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 15;
153 static const int kOCSPResponseTag =
154     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 16;
155 static const int kExtendedMasterSecretTag =
156     CBS_ASN1_CONSTRUCTED | CBS_ASN1_CONTEXT_SPECIFIC | 17;
157 
SSL_SESSION_to_bytes_full(SSL_SESSION * in,uint8_t ** out_data,size_t * out_len,int for_ticket)158 static int SSL_SESSION_to_bytes_full(SSL_SESSION *in, uint8_t **out_data,
159                                      size_t *out_len, int for_ticket) {
160   CBB cbb, session, child, child2;
161 
162   if (in == NULL || in->cipher == NULL) {
163     return 0;
164   }
165 
166   if (!CBB_init(&cbb, 0)) {
167     return 0;
168   }
169 
170   if (!CBB_add_asn1(&cbb, &session, CBS_ASN1_SEQUENCE) ||
171       !CBB_add_asn1_uint64(&session, SSL_SESSION_ASN1_VERSION) ||
172       !CBB_add_asn1_uint64(&session, in->ssl_version) ||
173       !CBB_add_asn1(&session, &child, CBS_ASN1_OCTETSTRING) ||
174       !CBB_add_u16(&child, (uint16_t)(in->cipher->id & 0xffff)) ||
175       !CBB_add_asn1(&session, &child, CBS_ASN1_OCTETSTRING) ||
176       /* The session ID is irrelevant for a session ticket. */
177       !CBB_add_bytes(&child, in->session_id,
178                      for_ticket ? 0 : in->session_id_length) ||
179       !CBB_add_asn1(&session, &child, CBS_ASN1_OCTETSTRING) ||
180       !CBB_add_bytes(&child, in->master_key, in->master_key_length)) {
181     OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
182     goto err;
183   }
184 
185   if (in->time != 0) {
186     if (!CBB_add_asn1(&session, &child, kTimeTag) ||
187         !CBB_add_asn1_uint64(&child, in->time)) {
188       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
189       goto err;
190     }
191   }
192 
193   if (in->timeout != 0) {
194     if (!CBB_add_asn1(&session, &child, kTimeoutTag) ||
195         !CBB_add_asn1_uint64(&child, in->timeout)) {
196       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
197       goto err;
198     }
199   }
200 
201   /* The peer certificate is only serialized if the SHA-256 isn't
202    * serialized instead. */
203   if (in->peer && !in->peer_sha256_valid) {
204     uint8_t *buf;
205     int len = i2d_X509(in->peer, NULL);
206     if (len < 0) {
207       goto err;
208     }
209     if (!CBB_add_asn1(&session, &child, kPeerTag) ||
210         !CBB_add_space(&child, &buf, len)) {
211       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
212       goto err;
213     }
214     if (buf != NULL && i2d_X509(in->peer, &buf) < 0) {
215       goto err;
216     }
217   }
218 
219   /* Although it is OPTIONAL and usually empty, OpenSSL has
220    * historically always encoded the sid_ctx. */
221   if (!CBB_add_asn1(&session, &child, kSessionIDContextTag) ||
222       !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
223       !CBB_add_bytes(&child2, in->sid_ctx, in->sid_ctx_length)) {
224     OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
225     goto err;
226   }
227 
228   if (in->verify_result != X509_V_OK) {
229     if (!CBB_add_asn1(&session, &child, kVerifyResultTag) ||
230         !CBB_add_asn1_uint64(&child, in->verify_result)) {
231       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
232       goto err;
233     }
234   }
235 
236   if (in->tlsext_hostname) {
237     if (!CBB_add_asn1(&session, &child, kHostNameTag) ||
238         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
239         !CBB_add_bytes(&child2, (const uint8_t *)in->tlsext_hostname,
240                        strlen(in->tlsext_hostname))) {
241       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
242       goto err;
243     }
244   }
245 
246   if (in->psk_identity) {
247     if (!CBB_add_asn1(&session, &child, kPSKIdentityTag) ||
248         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
249         !CBB_add_bytes(&child2, (const uint8_t *)in->psk_identity,
250                        strlen(in->psk_identity))) {
251       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
252       goto err;
253     }
254   }
255 
256   if (in->tlsext_tick_lifetime_hint > 0) {
257     if (!CBB_add_asn1(&session, &child, kTicketLifetimeHintTag) ||
258         !CBB_add_asn1_uint64(&child, in->tlsext_tick_lifetime_hint)) {
259       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
260       goto err;
261     }
262   }
263 
264   if (in->tlsext_tick) {
265     if (!CBB_add_asn1(&session, &child, kTicketTag) ||
266         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
267         !CBB_add_bytes(&child2, in->tlsext_tick, in->tlsext_ticklen)) {
268       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
269       goto err;
270     }
271   }
272 
273   if (in->peer_sha256_valid) {
274     if (!CBB_add_asn1(&session, &child, kPeerSHA256Tag) ||
275         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
276         !CBB_add_bytes(&child2, in->peer_sha256, sizeof(in->peer_sha256))) {
277       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
278       goto err;
279     }
280   }
281 
282   if (in->original_handshake_hash_len > 0) {
283     if (!CBB_add_asn1(&session, &child, kOriginalHandshakeHashTag) ||
284         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
285         !CBB_add_bytes(&child2, in->original_handshake_hash,
286                        in->original_handshake_hash_len)) {
287       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
288       goto err;
289     }
290   }
291 
292   if (in->tlsext_signed_cert_timestamp_list_length > 0) {
293     if (!CBB_add_asn1(&session, &child, kSignedCertTimestampListTag) ||
294         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
295         !CBB_add_bytes(&child2, in->tlsext_signed_cert_timestamp_list,
296                        in->tlsext_signed_cert_timestamp_list_length)) {
297       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
298       goto err;
299     }
300   }
301 
302   if (in->ocsp_response_length > 0) {
303     if (!CBB_add_asn1(&session, &child, kOCSPResponseTag) ||
304         !CBB_add_asn1(&child, &child2, CBS_ASN1_OCTETSTRING) ||
305         !CBB_add_bytes(&child2, in->ocsp_response, in->ocsp_response_length)) {
306       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
307       goto err;
308     }
309   }
310 
311   if (in->extended_master_secret) {
312     if (!CBB_add_asn1(&session, &child, kExtendedMasterSecretTag) ||
313         !CBB_add_asn1(&child, &child2, CBS_ASN1_BOOLEAN) ||
314         !CBB_add_u8(&child2, 0xff)) {
315       OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
316       goto err;
317     }
318   }
319 
320   if (!CBB_finish(&cbb, out_data, out_len)) {
321     OPENSSL_PUT_ERROR(SSL, SSL_SESSION_to_bytes_full, ERR_R_MALLOC_FAILURE);
322     goto err;
323   }
324   return 1;
325 
326  err:
327   CBB_cleanup(&cbb);
328   return 0;
329 }
330 
SSL_SESSION_to_bytes(SSL_SESSION * in,uint8_t ** out_data,size_t * out_len)331 int SSL_SESSION_to_bytes(SSL_SESSION *in, uint8_t **out_data, size_t *out_len) {
332   return SSL_SESSION_to_bytes_full(in, out_data, out_len, 0);
333 }
334 
SSL_SESSION_to_bytes_for_ticket(SSL_SESSION * in,uint8_t ** out_data,size_t * out_len)335 int SSL_SESSION_to_bytes_for_ticket(SSL_SESSION *in, uint8_t **out_data,
336                                     size_t *out_len) {
337   return SSL_SESSION_to_bytes_full(in, out_data, out_len, 1);
338 }
339 
i2d_SSL_SESSION(SSL_SESSION * in,uint8_t ** pp)340 int i2d_SSL_SESSION(SSL_SESSION *in, uint8_t **pp) {
341   uint8_t *out;
342   size_t len;
343 
344   if (!SSL_SESSION_to_bytes(in, &out, &len)) {
345     return -1;
346   }
347 
348   if (len > INT_MAX) {
349     OPENSSL_free(out);
350     OPENSSL_PUT_ERROR(SSL, i2d_SSL_SESSION, ERR_R_OVERFLOW);
351     return -1;
352   }
353 
354   if (pp) {
355     memcpy(*pp, out, len);
356     *pp += len;
357   }
358   OPENSSL_free(out);
359 
360   return len;
361 }
362 
363 /* d2i_SSL_SESSION_get_string gets an optional ASN.1 OCTET STRING
364  * explicitly tagged with |tag| from |cbs| and saves it in |*out|. On
365  * entry, if |*out| is not NULL, it frees the existing contents. If
366  * the element was not found, it sets |*out| to NULL. It returns one
367  * on success, whether or not the element was found, and zero on
368  * decode error. */
d2i_SSL_SESSION_get_string(CBS * cbs,char ** out,unsigned tag)369 static int d2i_SSL_SESSION_get_string(CBS *cbs, char **out, unsigned tag) {
370   CBS value;
371   int present;
372   if (!CBS_get_optional_asn1_octet_string(cbs, &value, &present, tag)) {
373     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
374     return 0;
375   }
376   if (present) {
377     if (CBS_contains_zero_byte(&value)) {
378       OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
379       return 0;
380     }
381     if (!CBS_strdup(&value, out)) {
382       OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, ERR_R_MALLOC_FAILURE);
383       return 0;
384     }
385   } else {
386     OPENSSL_free(*out);
387     *out = NULL;
388   }
389   return 1;
390 }
391 
392 /* d2i_SSL_SESSION_get_string gets an optional ASN.1 OCTET STRING
393  * explicitly tagged with |tag| from |cbs| and stows it in |*out_ptr|
394  * and |*out_len|. If |*out_ptr| is not NULL, it frees the existing
395  * contents. On entry, if the element was not found, it sets
396  * |*out_ptr| to NULL. It returns one on success, whether or not the
397  * element was found, and zero on decode error. */
d2i_SSL_SESSION_get_octet_string(CBS * cbs,uint8_t ** out_ptr,size_t * out_len,unsigned tag)398 static int d2i_SSL_SESSION_get_octet_string(CBS *cbs, uint8_t **out_ptr,
399                                             size_t *out_len, unsigned tag) {
400   CBS value;
401   if (!CBS_get_optional_asn1_octet_string(cbs, &value, NULL, tag)) {
402     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
403     return 0;
404   }
405   if (!CBS_stow(&value, out_ptr, out_len)) {
406     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, ERR_R_MALLOC_FAILURE);
407     return 0;
408   }
409   return 1;
410 }
411 
d2i_SSL_SESSION(SSL_SESSION ** a,const uint8_t ** pp,long length)412 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const uint8_t **pp, long length) {
413   SSL_SESSION *ret, *allocated = NULL;
414   CBS cbs, session, cipher, session_id, master_key;
415   CBS peer, sid_ctx, peer_sha256, original_handshake_hash;
416   int has_peer, has_peer_sha256, extended_master_secret;
417   uint64_t version, ssl_version;
418   uint64_t session_time, timeout, verify_result, ticket_lifetime_hint;
419 
420   if (a && *a) {
421     ret = *a;
422   } else {
423     ret = allocated = SSL_SESSION_new();
424     if (allocated == NULL) {
425       goto err;
426     }
427   }
428 
429   CBS_init(&cbs, *pp, length);
430   if (!CBS_get_asn1(&cbs, &session, CBS_ASN1_SEQUENCE) ||
431       !CBS_get_asn1_uint64(&session, &version) ||
432       !CBS_get_asn1_uint64(&session, &ssl_version) ||
433       !CBS_get_asn1(&session, &cipher, CBS_ASN1_OCTETSTRING) ||
434       !CBS_get_asn1(&session, &session_id, CBS_ASN1_OCTETSTRING) ||
435       !CBS_get_asn1(&session, &master_key, CBS_ASN1_OCTETSTRING) ||
436       !CBS_get_optional_asn1_uint64(&session, &session_time, kTimeTag,
437                                     time(NULL)) ||
438       !CBS_get_optional_asn1_uint64(&session, &timeout, kTimeoutTag, 3) ||
439       !CBS_get_optional_asn1(&session, &peer, &has_peer, kPeerTag) ||
440       !CBS_get_optional_asn1_octet_string(&session, &sid_ctx, NULL,
441                                           kSessionIDContextTag) ||
442       !CBS_get_optional_asn1_uint64(&session, &verify_result, kVerifyResultTag,
443                                     X509_V_OK)) {
444     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
445     goto err;
446   }
447   if (!d2i_SSL_SESSION_get_string(&session, &ret->tlsext_hostname,
448                                   kHostNameTag) ||
449       !d2i_SSL_SESSION_get_string(&session, &ret->psk_identity,
450                                   kPSKIdentityTag)) {
451     goto err;
452   }
453   if (!CBS_get_optional_asn1_uint64(&session, &ticket_lifetime_hint,
454                                     kTicketLifetimeHintTag, 0)) {
455     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
456     goto err;
457   }
458   if (!d2i_SSL_SESSION_get_octet_string(&session, &ret->tlsext_tick,
459                                         &ret->tlsext_ticklen, kTicketTag)) {
460     goto err;
461   }
462   if (!CBS_get_optional_asn1_octet_string(&session, &peer_sha256,
463                                           &has_peer_sha256, kPeerSHA256Tag) ||
464       !CBS_get_optional_asn1_octet_string(&session, &original_handshake_hash,
465                                           NULL, kOriginalHandshakeHashTag)) {
466     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
467     goto err;
468   }
469   if (!d2i_SSL_SESSION_get_octet_string(
470           &session, &ret->tlsext_signed_cert_timestamp_list,
471           &ret->tlsext_signed_cert_timestamp_list_length,
472           kSignedCertTimestampListTag) ||
473       !d2i_SSL_SESSION_get_octet_string(
474           &session, &ret->ocsp_response, &ret->ocsp_response_length,
475           kOCSPResponseTag)) {
476     goto err;
477   }
478   if (!CBS_get_optional_asn1_bool(&session, &extended_master_secret,
479                                   kExtendedMasterSecretTag,
480                                   0 /* default to false */) ||
481       CBS_len(&session) != 0) {
482     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
483     goto err;
484   }
485   ret->extended_master_secret = extended_master_secret;
486 
487   if (version != SSL_SESSION_ASN1_VERSION) {
488     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
489     goto err;
490   }
491 
492   /* Only support SSLv3/TLS and DTLS. */
493   if ((ssl_version >> 8) != SSL3_VERSION_MAJOR &&
494       (ssl_version >> 8) != (DTLS1_VERSION >> 8)) {
495     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_UNKNOWN_SSL_VERSION);
496     goto err;
497   }
498   ret->ssl_version = ssl_version;
499 
500   uint16_t cipher_value;
501   if (!CBS_get_u16(&cipher, &cipher_value) || CBS_len(&cipher) != 0) {
502     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_CIPHER_CODE_WRONG_LENGTH);
503     goto err;
504   }
505   ret->cipher = SSL_get_cipher_by_value(cipher_value);
506   if (ret->cipher == NULL) {
507     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_UNSUPPORTED_CIPHER);
508     goto err;
509   }
510 
511   if (CBS_len(&session_id) > SSL3_MAX_SSL_SESSION_ID_LENGTH) {
512     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
513     goto err;
514   }
515   memcpy(ret->session_id, CBS_data(&session_id), CBS_len(&session_id));
516   ret->session_id_length = CBS_len(&session_id);
517 
518   if (CBS_len(&master_key) > SSL_MAX_MASTER_KEY_LENGTH) {
519     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
520     goto err;
521   }
522   memcpy(ret->master_key, CBS_data(&master_key), CBS_len(&master_key));
523   ret->master_key_length = CBS_len(&master_key);
524 
525   if (session_time > LONG_MAX ||
526       timeout > LONG_MAX) {
527     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
528     goto err;
529   }
530   ret->time = session_time;
531   ret->timeout = timeout;
532 
533   X509_free(ret->peer);
534   ret->peer = NULL;
535   if (has_peer) {
536     const uint8_t *ptr;
537     ptr = CBS_data(&peer);
538     ret->peer = d2i_X509(NULL, &ptr, CBS_len(&peer));
539     if (ret->peer == NULL) {
540       goto err;
541     }
542     if (ptr != CBS_data(&peer) + CBS_len(&peer)) {
543       OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
544       goto err;
545     }
546   }
547 
548   if (CBS_len(&sid_ctx) > sizeof(ret->sid_ctx)) {
549     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
550     goto err;
551   }
552   memcpy(ret->sid_ctx, CBS_data(&sid_ctx), CBS_len(&sid_ctx));
553   ret->sid_ctx_length = CBS_len(&sid_ctx);
554 
555   if (verify_result > LONG_MAX ||
556       ticket_lifetime_hint > 0xffffffff) {
557     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
558     goto err;
559   }
560   ret->verify_result = verify_result;
561   ret->tlsext_tick_lifetime_hint = ticket_lifetime_hint;
562 
563   if (has_peer_sha256) {
564     if (CBS_len(&peer_sha256) != sizeof(ret->peer_sha256)) {
565       OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
566       goto err;
567     }
568     memcpy(ret->peer_sha256, CBS_data(&peer_sha256), sizeof(ret->peer_sha256));
569     ret->peer_sha256_valid = 1;
570   } else {
571     ret->peer_sha256_valid = 0;
572   }
573 
574   if (CBS_len(&original_handshake_hash) >
575       sizeof(ret->original_handshake_hash)) {
576     OPENSSL_PUT_ERROR(SSL, d2i_SSL_SESSION, SSL_R_INVALID_SSL_SESSION);
577     goto err;
578   }
579   memcpy(ret->original_handshake_hash, CBS_data(&original_handshake_hash),
580          CBS_len(&original_handshake_hash));
581   ret->original_handshake_hash_len = CBS_len(&original_handshake_hash);
582 
583   if (a) {
584     *a = ret;
585   }
586   *pp = CBS_data(&cbs);
587   return ret;
588 
589 err:
590   SSL_SESSION_free(allocated);
591   return NULL;
592 }
593