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ssl_asn1.c revision 1.1.1.7.2.1
      1 /* ssl/ssl_asn1.c */
      2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com)
      3  * All rights reserved.
      4  *
      5  * This package is an SSL implementation written
      6  * by Eric Young (eay (at) cryptsoft.com).
      7  * The implementation was written so as to conform with Netscapes SSL.
      8  *
      9  * This library is free for commercial and non-commercial use as long as
     10  * the following conditions are aheared to.  The following conditions
     11  * apply to all code found in this distribution, be it the RC4, RSA,
     12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
     13  * included with this distribution is covered by the same copyright terms
     14  * except that the holder is Tim Hudson (tjh (at) cryptsoft.com).
     15  *
     16  * Copyright remains Eric Young's, and as such any Copyright notices in
     17  * the code are not to be removed.
     18  * If this package is used in a product, Eric Young should be given attribution
     19  * as the author of the parts of the library used.
     20  * This can be in the form of a textual message at program startup or
     21  * in documentation (online or textual) provided with the package.
     22  *
     23  * Redistribution and use in source and binary forms, with or without
     24  * modification, are permitted provided that the following conditions
     25  * are met:
     26  * 1. Redistributions of source code must retain the copyright
     27  *    notice, this list of conditions and the following disclaimer.
     28  * 2. Redistributions in binary form must reproduce the above copyright
     29  *    notice, this list of conditions and the following disclaimer in the
     30  *    documentation and/or other materials provided with the distribution.
     31  * 3. All advertising materials mentioning features or use of this software
     32  *    must display the following acknowledgement:
     33  *    "This product includes cryptographic software written by
     34  *     Eric Young (eay (at) cryptsoft.com)"
     35  *    The word 'cryptographic' can be left out if the rouines from the library
     36  *    being used are not cryptographic related :-).
     37  * 4. If you include any Windows specific code (or a derivative thereof) from
     38  *    the apps directory (application code) you must include an acknowledgement:
     39  *    "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)"
     40  *
     41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
     42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     51  * SUCH DAMAGE.
     52  *
     53  * The licence and distribution terms for any publically available version or
     54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
     55  * copied and put under another distribution licence
     56  * [including the GNU Public Licence.]
     57  */
     58 /* ====================================================================
     59  * Copyright 2005 Nokia. All rights reserved.
     60  *
     61  * The portions of the attached software ("Contribution") is developed by
     62  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
     63  * license.
     64  *
     65  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
     66  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
     67  * support (see RFC 4279) to OpenSSL.
     68  *
     69  * No patent licenses or other rights except those expressly stated in
     70  * the OpenSSL open source license shall be deemed granted or received
     71  * expressly, by implication, estoppel, or otherwise.
     72  *
     73  * No assurances are provided by Nokia that the Contribution does not
     74  * infringe the patent or other intellectual property rights of any third
     75  * party or that the license provides you with all the necessary rights
     76  * to make use of the Contribution.
     77  *
     78  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
     79  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
     80  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
     81  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
     82  * OTHERWISE.
     83  */
     84 
     85 #include <stdio.h>
     86 #include <stdlib.h>
     87 #include "ssl_locl.h"
     88 #include <openssl/asn1_mac.h>
     89 #include <openssl/objects.h>
     90 #include <openssl/x509.h>
     91 
     92 typedef struct ssl_session_asn1_st {
     93     ASN1_INTEGER version;
     94     ASN1_INTEGER ssl_version;
     95     ASN1_OCTET_STRING cipher;
     96     ASN1_OCTET_STRING comp_id;
     97     ASN1_OCTET_STRING master_key;
     98     ASN1_OCTET_STRING session_id;
     99     ASN1_OCTET_STRING session_id_context;
    100     ASN1_OCTET_STRING key_arg;
    101 #ifndef OPENSSL_NO_KRB5
    102     ASN1_OCTET_STRING krb5_princ;
    103 #endif                          /* OPENSSL_NO_KRB5 */
    104     ASN1_INTEGER time;
    105     ASN1_INTEGER timeout;
    106     ASN1_INTEGER verify_result;
    107 #ifndef OPENSSL_NO_TLSEXT
    108     ASN1_OCTET_STRING tlsext_hostname;
    109     ASN1_INTEGER tlsext_tick_lifetime;
    110     ASN1_OCTET_STRING tlsext_tick;
    111 #endif                          /* OPENSSL_NO_TLSEXT */
    112 #ifndef OPENSSL_NO_PSK
    113     ASN1_OCTET_STRING psk_identity_hint;
    114     ASN1_OCTET_STRING psk_identity;
    115 #endif                          /* OPENSSL_NO_PSK */
    116 #ifndef OPENSSL_NO_SRP
    117     ASN1_OCTET_STRING srp_username;
    118 #endif                          /* OPENSSL_NO_SRP */
    119 } SSL_SESSION_ASN1;
    120 
    121 int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
    122 {
    123 #define LSIZE2 (sizeof(long)*2)
    124     int v1 = 0, v2 = 0, v3 = 0, v4 = 0, v5 = 0;
    125     unsigned char buf[4], ibuf1[LSIZE2], ibuf2[LSIZE2];
    126     unsigned char ibuf3[LSIZE2], ibuf4[LSIZE2], ibuf5[LSIZE2];
    127 #ifndef OPENSSL_NO_TLSEXT
    128     int v6 = 0, v9 = 0, v10 = 0;
    129     unsigned char ibuf6[LSIZE2];
    130 #endif
    131 #ifndef OPENSSL_NO_PSK
    132     int v7 = 0, v8 = 0;
    133 #endif
    134 #ifndef OPENSSL_NO_COMP
    135     unsigned char cbuf;
    136     int v11 = 0;
    137 #endif
    138 #ifndef OPENSSL_NO_SRP
    139     int v12 = 0;
    140 #endif
    141     long l;
    142     SSL_SESSION_ASN1 a;
    143     M_ASN1_I2D_vars(in);
    144 
    145     if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
    146         return (0);
    147 
    148     /*
    149      * Note that I cheat in the following 2 assignments.  I know that if the
    150      * ASN1_INTEGER passed to ASN1_INTEGER_set is > sizeof(long)+1, the
    151      * buffer will not be re-OPENSSL_malloc()ed. This is a bit evil but makes
    152      * things simple, no dynamic allocation to clean up :-)
    153      */
    154     a.version.length = LSIZE2;
    155     a.version.type = V_ASN1_INTEGER;
    156     a.version.data = ibuf1;
    157     ASN1_INTEGER_set(&(a.version), SSL_SESSION_ASN1_VERSION);
    158 
    159     a.ssl_version.length = LSIZE2;
    160     a.ssl_version.type = V_ASN1_INTEGER;
    161     a.ssl_version.data = ibuf2;
    162     ASN1_INTEGER_set(&(a.ssl_version), in->ssl_version);
    163 
    164     a.cipher.type = V_ASN1_OCTET_STRING;
    165     a.cipher.data = buf;
    166 
    167     if (in->cipher == NULL)
    168         l = in->cipher_id;
    169     else
    170         l = in->cipher->id;
    171     if (in->ssl_version == SSL2_VERSION) {
    172         a.cipher.length = 3;
    173         buf[0] = ((unsigned char)(l >> 16L)) & 0xff;
    174         buf[1] = ((unsigned char)(l >> 8L)) & 0xff;
    175         buf[2] = ((unsigned char)(l)) & 0xff;
    176     } else {
    177         a.cipher.length = 2;
    178         buf[0] = ((unsigned char)(l >> 8L)) & 0xff;
    179         buf[1] = ((unsigned char)(l)) & 0xff;
    180     }
    181 
    182 #ifndef OPENSSL_NO_COMP
    183     if (in->compress_meth) {
    184         cbuf = (unsigned char)in->compress_meth;
    185         a.comp_id.length = 1;
    186         a.comp_id.type = V_ASN1_OCTET_STRING;
    187         a.comp_id.data = &cbuf;
    188     }
    189 #endif
    190 
    191     a.master_key.length = in->master_key_length;
    192     a.master_key.type = V_ASN1_OCTET_STRING;
    193     a.master_key.data = in->master_key;
    194 
    195     a.session_id.length = in->session_id_length;
    196     a.session_id.type = V_ASN1_OCTET_STRING;
    197     a.session_id.data = in->session_id;
    198 
    199     a.session_id_context.length = in->sid_ctx_length;
    200     a.session_id_context.type = V_ASN1_OCTET_STRING;
    201     a.session_id_context.data = in->sid_ctx;
    202 
    203     a.key_arg.length = in->key_arg_length;
    204     a.key_arg.type = V_ASN1_OCTET_STRING;
    205     a.key_arg.data = in->key_arg;
    206 
    207 #ifndef OPENSSL_NO_KRB5
    208     if (in->krb5_client_princ_len) {
    209         a.krb5_princ.length = in->krb5_client_princ_len;
    210         a.krb5_princ.type = V_ASN1_OCTET_STRING;
    211         a.krb5_princ.data = in->krb5_client_princ;
    212     }
    213 #endif                          /* OPENSSL_NO_KRB5 */
    214 
    215     if (in->time != 0L) {
    216         a.time.length = LSIZE2;
    217         a.time.type = V_ASN1_INTEGER;
    218         a.time.data = ibuf3;
    219         ASN1_INTEGER_set(&(a.time), in->time);
    220     }
    221 
    222     if (in->timeout != 0L) {
    223         a.timeout.length = LSIZE2;
    224         a.timeout.type = V_ASN1_INTEGER;
    225         a.timeout.data = ibuf4;
    226         ASN1_INTEGER_set(&(a.timeout), in->timeout);
    227     }
    228 
    229     if (in->verify_result != X509_V_OK) {
    230         a.verify_result.length = LSIZE2;
    231         a.verify_result.type = V_ASN1_INTEGER;
    232         a.verify_result.data = ibuf5;
    233         ASN1_INTEGER_set(&a.verify_result, in->verify_result);
    234     }
    235 #ifndef OPENSSL_NO_TLSEXT
    236     if (in->tlsext_hostname) {
    237         a.tlsext_hostname.length = strlen(in->tlsext_hostname);
    238         a.tlsext_hostname.type = V_ASN1_OCTET_STRING;
    239         a.tlsext_hostname.data = (unsigned char *)in->tlsext_hostname;
    240     }
    241     if (in->tlsext_tick) {
    242         a.tlsext_tick.length = in->tlsext_ticklen;
    243         a.tlsext_tick.type = V_ASN1_OCTET_STRING;
    244         a.tlsext_tick.data = (unsigned char *)in->tlsext_tick;
    245     }
    246     if (in->tlsext_tick_lifetime_hint > 0) {
    247         a.tlsext_tick_lifetime.length = LSIZE2;
    248         a.tlsext_tick_lifetime.type = V_ASN1_INTEGER;
    249         a.tlsext_tick_lifetime.data = ibuf6;
    250         ASN1_INTEGER_set(&a.tlsext_tick_lifetime,
    251                          in->tlsext_tick_lifetime_hint);
    252     }
    253 #endif                          /* OPENSSL_NO_TLSEXT */
    254 #ifndef OPENSSL_NO_PSK
    255     if (in->psk_identity_hint) {
    256         a.psk_identity_hint.length = strlen(in->psk_identity_hint);
    257         a.psk_identity_hint.type = V_ASN1_OCTET_STRING;
    258         a.psk_identity_hint.data = (unsigned char *)(in->psk_identity_hint);
    259     }
    260     if (in->psk_identity) {
    261         a.psk_identity.length = strlen(in->psk_identity);
    262         a.psk_identity.type = V_ASN1_OCTET_STRING;
    263         a.psk_identity.data = (unsigned char *)(in->psk_identity);
    264     }
    265 #endif                          /* OPENSSL_NO_PSK */
    266 #ifndef OPENSSL_NO_SRP
    267     if (in->srp_username) {
    268         a.srp_username.length = strlen(in->srp_username);
    269         a.srp_username.type = V_ASN1_OCTET_STRING;
    270         a.srp_username.data = (unsigned char *)(in->srp_username);
    271     }
    272 #endif                          /* OPENSSL_NO_SRP */
    273 
    274     M_ASN1_I2D_len(&(a.version), i2d_ASN1_INTEGER);
    275     M_ASN1_I2D_len(&(a.ssl_version), i2d_ASN1_INTEGER);
    276     M_ASN1_I2D_len(&(a.cipher), i2d_ASN1_OCTET_STRING);
    277     M_ASN1_I2D_len(&(a.session_id), i2d_ASN1_OCTET_STRING);
    278     M_ASN1_I2D_len(&(a.master_key), i2d_ASN1_OCTET_STRING);
    279 #ifndef OPENSSL_NO_KRB5
    280     if (in->krb5_client_princ_len)
    281         M_ASN1_I2D_len(&(a.krb5_princ), i2d_ASN1_OCTET_STRING);
    282 #endif                          /* OPENSSL_NO_KRB5 */
    283     if (in->key_arg_length > 0)
    284         M_ASN1_I2D_len_IMP_opt(&(a.key_arg), i2d_ASN1_OCTET_STRING);
    285     if (in->time != 0L)
    286         M_ASN1_I2D_len_EXP_opt(&(a.time), i2d_ASN1_INTEGER, 1, v1);
    287     if (in->timeout != 0L)
    288         M_ASN1_I2D_len_EXP_opt(&(a.timeout), i2d_ASN1_INTEGER, 2, v2);
    289     if (in->peer != NULL)
    290         M_ASN1_I2D_len_EXP_opt(in->peer, i2d_X509, 3, v3);
    291     M_ASN1_I2D_len_EXP_opt(&a.session_id_context, i2d_ASN1_OCTET_STRING, 4,
    292                            v4);
    293     if (in->verify_result != X509_V_OK)
    294         M_ASN1_I2D_len_EXP_opt(&(a.verify_result), i2d_ASN1_INTEGER, 5, v5);
    295 
    296 #ifndef OPENSSL_NO_TLSEXT
    297     if (in->tlsext_tick_lifetime_hint > 0)
    298         M_ASN1_I2D_len_EXP_opt(&a.tlsext_tick_lifetime, i2d_ASN1_INTEGER, 9,
    299                                v9);
    300     if (in->tlsext_tick)
    301         M_ASN1_I2D_len_EXP_opt(&(a.tlsext_tick), i2d_ASN1_OCTET_STRING, 10,
    302                                v10);
    303     if (in->tlsext_hostname)
    304         M_ASN1_I2D_len_EXP_opt(&(a.tlsext_hostname), i2d_ASN1_OCTET_STRING, 6,
    305                                v6);
    306 # ifndef OPENSSL_NO_COMP
    307     if (in->compress_meth)
    308         M_ASN1_I2D_len_EXP_opt(&(a.comp_id), i2d_ASN1_OCTET_STRING, 11, v11);
    309 # endif
    310 #endif                          /* OPENSSL_NO_TLSEXT */
    311 #ifndef OPENSSL_NO_PSK
    312     if (in->psk_identity_hint)
    313         M_ASN1_I2D_len_EXP_opt(&(a.psk_identity_hint), i2d_ASN1_OCTET_STRING,
    314                                7, v7);
    315     if (in->psk_identity)
    316         M_ASN1_I2D_len_EXP_opt(&(a.psk_identity), i2d_ASN1_OCTET_STRING, 8,
    317                                v8);
    318 #endif                          /* OPENSSL_NO_PSK */
    319 #ifndef OPENSSL_NO_SRP
    320     if (in->srp_username)
    321         M_ASN1_I2D_len_EXP_opt(&(a.srp_username), i2d_ASN1_OCTET_STRING, 12,
    322                                v12);
    323 #endif                          /* OPENSSL_NO_SRP */
    324 
    325     M_ASN1_I2D_seq_total();
    326 
    327     M_ASN1_I2D_put(&(a.version), i2d_ASN1_INTEGER);
    328     M_ASN1_I2D_put(&(a.ssl_version), i2d_ASN1_INTEGER);
    329     M_ASN1_I2D_put(&(a.cipher), i2d_ASN1_OCTET_STRING);
    330     M_ASN1_I2D_put(&(a.session_id), i2d_ASN1_OCTET_STRING);
    331     M_ASN1_I2D_put(&(a.master_key), i2d_ASN1_OCTET_STRING);
    332 #ifndef OPENSSL_NO_KRB5
    333     if (in->krb5_client_princ_len)
    334         M_ASN1_I2D_put(&(a.krb5_princ), i2d_ASN1_OCTET_STRING);
    335 #endif                          /* OPENSSL_NO_KRB5 */
    336     if (in->key_arg_length > 0)
    337         M_ASN1_I2D_put_IMP_opt(&(a.key_arg), i2d_ASN1_OCTET_STRING, 0);
    338     if (in->time != 0L)
    339         M_ASN1_I2D_put_EXP_opt(&(a.time), i2d_ASN1_INTEGER, 1, v1);
    340     if (in->timeout != 0L)
    341         M_ASN1_I2D_put_EXP_opt(&(a.timeout), i2d_ASN1_INTEGER, 2, v2);
    342     if (in->peer != NULL)
    343         M_ASN1_I2D_put_EXP_opt(in->peer, i2d_X509, 3, v3);
    344     M_ASN1_I2D_put_EXP_opt(&a.session_id_context, i2d_ASN1_OCTET_STRING, 4,
    345                            v4);
    346     if (in->verify_result != X509_V_OK)
    347         M_ASN1_I2D_put_EXP_opt(&a.verify_result, i2d_ASN1_INTEGER, 5, v5);
    348 #ifndef OPENSSL_NO_TLSEXT
    349     if (in->tlsext_hostname)
    350         M_ASN1_I2D_put_EXP_opt(&(a.tlsext_hostname), i2d_ASN1_OCTET_STRING, 6,
    351                                v6);
    352 #endif                          /* OPENSSL_NO_TLSEXT */
    353 #ifndef OPENSSL_NO_PSK
    354     if (in->psk_identity_hint)
    355         M_ASN1_I2D_put_EXP_opt(&(a.psk_identity_hint), i2d_ASN1_OCTET_STRING,
    356                                7, v7);
    357     if (in->psk_identity)
    358         M_ASN1_I2D_put_EXP_opt(&(a.psk_identity), i2d_ASN1_OCTET_STRING, 8,
    359                                v8);
    360 #endif                          /* OPENSSL_NO_PSK */
    361 #ifndef OPENSSL_NO_TLSEXT
    362     if (in->tlsext_tick_lifetime_hint > 0)
    363         M_ASN1_I2D_put_EXP_opt(&a.tlsext_tick_lifetime, i2d_ASN1_INTEGER, 9,
    364                                v9);
    365     if (in->tlsext_tick)
    366         M_ASN1_I2D_put_EXP_opt(&(a.tlsext_tick), i2d_ASN1_OCTET_STRING, 10,
    367                                v10);
    368 #endif                          /* OPENSSL_NO_TLSEXT */
    369 #ifndef OPENSSL_NO_COMP
    370     if (in->compress_meth)
    371         M_ASN1_I2D_put_EXP_opt(&(a.comp_id), i2d_ASN1_OCTET_STRING, 11, v11);
    372 #endif
    373 #ifndef OPENSSL_NO_SRP
    374     if (in->srp_username)
    375         M_ASN1_I2D_put_EXP_opt(&(a.srp_username), i2d_ASN1_OCTET_STRING, 12,
    376                                v12);
    377 #endif                          /* OPENSSL_NO_SRP */
    378     M_ASN1_I2D_finish();
    379 }
    380 
    381 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
    382                              long length)
    383 {
    384     int ssl_version = 0, i;
    385     long id;
    386     ASN1_INTEGER ai, *aip;
    387     ASN1_OCTET_STRING os, *osp;
    388     M_ASN1_D2I_vars(a, SSL_SESSION *, SSL_SESSION_new);
    389 
    390     aip = &ai;
    391     osp = &os;
    392 
    393     M_ASN1_D2I_Init();
    394     M_ASN1_D2I_start_sequence();
    395 
    396     ai.data = NULL;
    397     ai.length = 0;
    398     M_ASN1_D2I_get_x(ASN1_INTEGER, aip, d2i_ASN1_INTEGER);
    399     if (ai.data != NULL) {
    400         OPENSSL_free(ai.data);
    401         ai.data = NULL;
    402         ai.length = 0;
    403     }
    404 
    405     /* we don't care about the version right now :-) */
    406     M_ASN1_D2I_get_x(ASN1_INTEGER, aip, d2i_ASN1_INTEGER);
    407     ssl_version = (int)ASN1_INTEGER_get(aip);
    408     ret->ssl_version = ssl_version;
    409     if (ai.data != NULL) {
    410         OPENSSL_free(ai.data);
    411         ai.data = NULL;
    412         ai.length = 0;
    413     }
    414 
    415     os.data = NULL;
    416     os.length = 0;
    417     M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
    418     if (ssl_version == SSL2_VERSION) {
    419         if (os.length != 3) {
    420             c.error = SSL_R_CIPHER_CODE_WRONG_LENGTH;
    421             c.line = __LINE__;
    422             goto err;
    423         }
    424         id = 0x02000000L |
    425             ((unsigned long)os.data[0] << 16L) |
    426             ((unsigned long)os.data[1] << 8L) | (unsigned long)os.data[2];
    427     } else if ((ssl_version >> 8) == SSL3_VERSION_MAJOR
    428         || (ssl_version >> 8) == DTLS1_VERSION_MAJOR
    429         || ssl_version == DTLS1_BAD_VER) {
    430         if (os.length != 2) {
    431             c.error = SSL_R_CIPHER_CODE_WRONG_LENGTH;
    432             c.line = __LINE__;
    433             goto err;
    434         }
    435         id = 0x03000000L |
    436             ((unsigned long)os.data[0] << 8L) | (unsigned long)os.data[1];
    437     } else {
    438         c.error = SSL_R_UNKNOWN_SSL_VERSION;
    439         c.line = __LINE__;
    440         goto err;
    441     }
    442 
    443     ret->cipher = NULL;
    444     ret->cipher_id = id;
    445 
    446     M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
    447     if ((ssl_version >> 8) >= SSL3_VERSION_MAJOR)
    448         i = SSL3_MAX_SSL_SESSION_ID_LENGTH;
    449     else                        /* if (ssl_version>>8 == SSL2_VERSION_MAJOR) */
    450         i = SSL2_MAX_SSL_SESSION_ID_LENGTH;
    451 
    452     if (os.length > i)
    453         os.length = i;
    454     if (os.length > (int)sizeof(ret->session_id)) /* can't happen */
    455         os.length = sizeof(ret->session_id);
    456 
    457     ret->session_id_length = os.length;
    458     OPENSSL_assert(os.length <= (int)sizeof(ret->session_id));
    459     memcpy(ret->session_id, os.data, os.length);
    460 
    461     M_ASN1_D2I_get_x(ASN1_OCTET_STRING, osp, d2i_ASN1_OCTET_STRING);
    462     if (os.length > SSL_MAX_MASTER_KEY_LENGTH)
    463         ret->master_key_length = SSL_MAX_MASTER_KEY_LENGTH;
    464     else
    465         ret->master_key_length = os.length;
    466     memcpy(ret->master_key, os.data, ret->master_key_length);
    467 
    468     os.length = 0;
    469 
    470 #ifndef OPENSSL_NO_KRB5
    471     os.length = 0;
    472     M_ASN1_D2I_get_opt(osp, d2i_ASN1_OCTET_STRING, V_ASN1_OCTET_STRING);
    473     if (os.data) {
    474         if (os.length > SSL_MAX_KRB5_PRINCIPAL_LENGTH)
    475             ret->krb5_client_princ_len = 0;
    476         else
    477             ret->krb5_client_princ_len = os.length;
    478         memcpy(ret->krb5_client_princ, os.data, ret->krb5_client_princ_len);
    479         OPENSSL_free(os.data);
    480         os.data = NULL;
    481         os.length = 0;
    482     } else
    483         ret->krb5_client_princ_len = 0;
    484 #endif                          /* OPENSSL_NO_KRB5 */
    485 
    486     M_ASN1_D2I_get_IMP_opt(osp, d2i_ASN1_OCTET_STRING, 0,
    487                            V_ASN1_OCTET_STRING);
    488     if (os.length > SSL_MAX_KEY_ARG_LENGTH)
    489         ret->key_arg_length = SSL_MAX_KEY_ARG_LENGTH;
    490     else
    491         ret->key_arg_length = os.length;
    492     memcpy(ret->key_arg, os.data, ret->key_arg_length);
    493     if (os.data != NULL)
    494         OPENSSL_free(os.data);
    495 
    496     ai.length = 0;
    497     M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 1);
    498     if (ai.data != NULL) {
    499         ret->time = ASN1_INTEGER_get(aip);
    500         OPENSSL_free(ai.data);
    501         ai.data = NULL;
    502         ai.length = 0;
    503     } else
    504         ret->time = (unsigned long)time(NULL);
    505 
    506     ai.length = 0;
    507     M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 2);
    508     if (ai.data != NULL) {
    509         ret->timeout = ASN1_INTEGER_get(aip);
    510         OPENSSL_free(ai.data);
    511         ai.data = NULL;
    512         ai.length = 0;
    513     } else
    514         ret->timeout = 3;
    515 
    516     if (ret->peer != NULL) {
    517         X509_free(ret->peer);
    518         ret->peer = NULL;
    519     }
    520     M_ASN1_D2I_get_EXP_opt(ret->peer, d2i_X509, 3);
    521 
    522     os.length = 0;
    523     os.data = NULL;
    524     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 4);
    525 
    526     if (os.data != NULL) {
    527         if (os.length > SSL_MAX_SID_CTX_LENGTH) {
    528             c.error = SSL_R_BAD_LENGTH;
    529             c.line = __LINE__;
    530             OPENSSL_free(os.data);
    531             os.data = NULL;
    532             os.length = 0;
    533             goto err;
    534         } else {
    535             ret->sid_ctx_length = os.length;
    536             memcpy(ret->sid_ctx, os.data, os.length);
    537         }
    538         OPENSSL_free(os.data);
    539         os.data = NULL;
    540         os.length = 0;
    541     } else
    542         ret->sid_ctx_length = 0;
    543 
    544     ai.length = 0;
    545     M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 5);
    546     if (ai.data != NULL) {
    547         ret->verify_result = ASN1_INTEGER_get(aip);
    548         OPENSSL_free(ai.data);
    549         ai.data = NULL;
    550         ai.length = 0;
    551     } else
    552         ret->verify_result = X509_V_OK;
    553 
    554 #ifndef OPENSSL_NO_TLSEXT
    555     os.length = 0;
    556     os.data = NULL;
    557     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 6);
    558     if (os.data) {
    559         ret->tlsext_hostname = BUF_strndup((char *)os.data, os.length);
    560         OPENSSL_free(os.data);
    561         os.data = NULL;
    562         os.length = 0;
    563     } else
    564         ret->tlsext_hostname = NULL;
    565 #endif                          /* OPENSSL_NO_TLSEXT */
    566 
    567 #ifndef OPENSSL_NO_PSK
    568     os.length = 0;
    569     os.data = NULL;
    570     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 7);
    571     if (os.data) {
    572         ret->psk_identity_hint = BUF_strndup((char *)os.data, os.length);
    573         OPENSSL_free(os.data);
    574         os.data = NULL;
    575         os.length = 0;
    576     } else
    577         ret->psk_identity_hint = NULL;
    578 
    579     os.length = 0;
    580     os.data = NULL;
    581     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 8);
    582     if (os.data) {
    583         ret->psk_identity = BUF_strndup((char *)os.data, os.length);
    584         OPENSSL_free(os.data);
    585         os.data = NULL;
    586         os.length = 0;
    587     } else
    588         ret->psk_identity = NULL;
    589 #endif                          /* OPENSSL_NO_PSK */
    590 
    591 #ifndef OPENSSL_NO_TLSEXT
    592     ai.length = 0;
    593     M_ASN1_D2I_get_EXP_opt(aip, d2i_ASN1_INTEGER, 9);
    594     if (ai.data != NULL) {
    595         ret->tlsext_tick_lifetime_hint = ASN1_INTEGER_get(aip);
    596         OPENSSL_free(ai.data);
    597         ai.data = NULL;
    598         ai.length = 0;
    599     } else if (ret->tlsext_ticklen && ret->session_id_length)
    600         ret->tlsext_tick_lifetime_hint = -1;
    601     else
    602         ret->tlsext_tick_lifetime_hint = 0;
    603     os.length = 0;
    604     os.data = NULL;
    605     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 10);
    606     if (os.data) {
    607         ret->tlsext_tick = os.data;
    608         ret->tlsext_ticklen = os.length;
    609         os.data = NULL;
    610         os.length = 0;
    611     } else
    612         ret->tlsext_tick = NULL;
    613 #endif                          /* OPENSSL_NO_TLSEXT */
    614 #ifndef OPENSSL_NO_COMP
    615     os.length = 0;
    616     os.data = NULL;
    617     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 11);
    618     if (os.data) {
    619         ret->compress_meth = os.data[0];
    620         OPENSSL_free(os.data);
    621         os.data = NULL;
    622     }
    623 #endif
    624 
    625 #ifndef OPENSSL_NO_SRP
    626     os.length = 0;
    627     os.data = NULL;
    628     M_ASN1_D2I_get_EXP_opt(osp, d2i_ASN1_OCTET_STRING, 12);
    629     if (os.data) {
    630         ret->srp_username = BUF_strndup((char *)os.data, os.length);
    631         OPENSSL_free(os.data);
    632         os.data = NULL;
    633         os.length = 0;
    634     } else
    635         ret->srp_username = NULL;
    636 #endif                          /* OPENSSL_NO_SRP */
    637 
    638     M_ASN1_D2I_Finish(a, SSL_SESSION_free, SSL_F_D2I_SSL_SESSION);
    639 }
    640