ssl/ssl_asn1.c

   1 /*
   2  * Copyright 1995-2017 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright 2005 Nokia. All rights reserved.
   4  *
   5  * Licensed under the OpenSSL license (the "License").  You may not use
   6  * this file except in compliance with the License.  You can obtain a copy
   7  * in the file LICENSE in the source distribution or at
   8  * https://www.openssl.org/source/license.html
   9  */
  10
  11 #include <stdio.h>
  12 #include <stdlib.h>
  13 #include "ssl_locl.h"
  14 #include <openssl/asn1t.h>
  15 #include <openssl/x509.h>
  16
  17 typedef struct {
  18     uint32_t version;
  19     int32_t ssl_version;
  20     ASN1_OCTET_STRING *cipher;
  21     ASN1_OCTET_STRING *comp_id;
  22     ASN1_OCTET_STRING *master_key;
  23     ASN1_OCTET_STRING *session_id;
  24     ASN1_OCTET_STRING *key_arg;
  25     int64_t time;
  26     int64_t timeout;
  27     X509 *peer;
  28     ASN1_OCTET_STRING *session_id_context;
  29     int32_t verify_result;
  30     ASN1_OCTET_STRING *tlsext_hostname;
  31     uint64_t tlsext_tick_lifetime_hint;
  32     uint32_t tlsext_tick_age_add;
  33     ASN1_OCTET_STRING *tlsext_tick;
  34 #ifndef OPENSSL_NO_PSK
  35     ASN1_OCTET_STRING *psk_identity_hint;
  36     ASN1_OCTET_STRING *psk_identity;
  37 #endif
  38 #ifndef OPENSSL_NO_SRP
  39     ASN1_OCTET_STRING *srp_username;
  40 #endif
  41     uint64_t flags;
  42     uint32_t max_early_data;
  43     ASN1_OCTET_STRING *alpn_selected;
  44     ASN1_OCTET_STRING *tick_nonce;
  45     uint32_t tlsext_max_fragment_len_mode;
  46     ASN1_OCTET_STRING *ticket_appdata;
  47 } SSL_SESSION_ASN1;
  48
  49 ASN1_SEQUENCE(SSL_SESSION_ASN1) = {
  50     ASN1_EMBED(SSL_SESSION_ASN1, version, UINT32),
  51     ASN1_EMBED(SSL_SESSION_ASN1, ssl_version, INT32),
  52     ASN1_SIMPLE(SSL_SESSION_ASN1, cipher, ASN1_OCTET_STRING),
  53     ASN1_SIMPLE(SSL_SESSION_ASN1, session_id, ASN1_OCTET_STRING),
  54     ASN1_SIMPLE(SSL_SESSION_ASN1, master_key, ASN1_OCTET_STRING),
  55     ASN1_IMP_OPT(SSL_SESSION_ASN1, key_arg, ASN1_OCTET_STRING, 0),
  56     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, time, ZINT64, 1),
  57     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, timeout, ZINT64, 2),
  58     ASN1_EXP_OPT(SSL_SESSION_ASN1, peer, X509, 3),
  59     ASN1_EXP_OPT(SSL_SESSION_ASN1, session_id_context, ASN1_OCTET_STRING, 4),
  60     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, verify_result, ZINT32, 5),
  61     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_hostname, ASN1_OCTET_STRING, 6),
  62 #ifndef OPENSSL_NO_PSK
  63     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity_hint, ASN1_OCTET_STRING, 7),
  64     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity, ASN1_OCTET_STRING, 8),
  65 #endif
  66     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_lifetime_hint, ZUINT64, 9),
  67     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_tick, ASN1_OCTET_STRING, 10),
  68     ASN1_EXP_OPT(SSL_SESSION_ASN1, comp_id, ASN1_OCTET_STRING, 11),
  69 #ifndef OPENSSL_NO_SRP
  70     ASN1_EXP_OPT(SSL_SESSION_ASN1, srp_username, ASN1_OCTET_STRING, 12),
  71 #endif
  72     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, flags, ZUINT64, 13),
  73     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_age_add, ZUINT32, 14),
  74     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, max_early_data, ZUINT32, 15),
  75     ASN1_EXP_OPT(SSL_SESSION_ASN1, alpn_selected, ASN1_OCTET_STRING, 16),
  76     ASN1_EXP_OPT(SSL_SESSION_ASN1, tick_nonce, ASN1_OCTET_STRING, 17),
  77     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_max_fragment_len_mode, ZUINT32, 18),
  78     ASN1_EXP_OPT(SSL_SESSION_ASN1, ticket_appdata, ASN1_OCTET_STRING, 19)
  79 } static_ASN1_SEQUENCE_END(SSL_SESSION_ASN1)
  80
  81 IMPLEMENT_STATIC_ASN1_ENCODE_FUNCTIONS(SSL_SESSION_ASN1)
  82
  83 /* Utility functions for i2d_SSL_SESSION */
  84
  85 /* Initialise OCTET STRING from buffer and length */
  86
  87 static void ssl_session_oinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
  88                               unsigned char *data, size_t len)
  89 {
  90     os->data = data;
  91     os->length = (int)len;
  92     os->flags = 0;
  93     *dest = os;
  94 }
  95
  96 /* Initialise OCTET STRING from string */
  97 static void ssl_session_sinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
  98                               char *data)
  99 {
 100     if (data != NULL)
 101         ssl_session_oinit(dest, os, (unsigned char *)data, strlen(data));
 102     else
 103         *dest = NULL;
 104 }
 105
 106 int i2d_SSL_SESSION(SSL_SESSION *in, unsigned char **pp)
 107 {
 108
 109     SSL_SESSION_ASN1 as;
 110
 111     ASN1_OCTET_STRING cipher;
 112     unsigned char cipher_data[2];
 113     ASN1_OCTET_STRING master_key, session_id, sid_ctx;
 114
 115 #ifndef OPENSSL_NO_COMP
 116     ASN1_OCTET_STRING comp_id;
 117     unsigned char comp_id_data;
 118 #endif
 119     ASN1_OCTET_STRING tlsext_hostname, tlsext_tick;
 120 #ifndef OPENSSL_NO_SRP
 121     ASN1_OCTET_STRING srp_username;
 122 #endif
 123 #ifndef OPENSSL_NO_PSK
 124     ASN1_OCTET_STRING psk_identity, psk_identity_hint;
 125 #endif
 126     ASN1_OCTET_STRING alpn_selected;
 127     ASN1_OCTET_STRING tick_nonce;
 128     ASN1_OCTET_STRING ticket_appdata;
 129
 130     long l;
 131
 132     if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
 133         return 0;
 134
 135     memset(&as, 0, sizeof(as));
 136
 137     as.version = SSL_SESSION_ASN1_VERSION;
 138     as.ssl_version = in->ssl_version;
 139
 140     if (in->cipher == NULL)
 141         l = in->cipher_id;
 142     else
 143         l = in->cipher->id;
 144     cipher_data[0] = ((unsigned char)(l >> 8L)) & 0xff;
 145     cipher_data[1] = ((unsigned char)(l)) & 0xff;
 146
 147     ssl_session_oinit(&as.cipher, &cipher, cipher_data, 2);
 148
 149 #ifndef OPENSSL_NO_COMP
 150     if (in->compress_meth) {
 151         comp_id_data = (unsigned char)in->compress_meth;
 152         ssl_session_oinit(&as.comp_id, &comp_id, &comp_id_data, 1);
 153     }
 154 #endif
 155
 156     ssl_session_oinit(&as.master_key, &master_key,
 157                       in->master_key, in->master_key_length);
 158
 159     ssl_session_oinit(&as.session_id, &session_id,
 160                       in->session_id, in->session_id_length);
 161
 162     ssl_session_oinit(&as.session_id_context, &sid_ctx,
 163                       in->sid_ctx, in->sid_ctx_length);
 164
 165     as.time = in->time;
 166     as.timeout = in->timeout;
 167     as.verify_result = in->verify_result;
 168
 169     as.peer = in->peer;
 170
 171     ssl_session_sinit(&as.tlsext_hostname, &tlsext_hostname,
 172                       in->ext.hostname);
 173     if (in->ext.tick) {
 174         ssl_session_oinit(&as.tlsext_tick, &tlsext_tick,
 175                           in->ext.tick, in->ext.ticklen);
 176     }
 177     if (in->ext.tick_lifetime_hint > 0)
 178         as.tlsext_tick_lifetime_hint = in->ext.tick_lifetime_hint;
 179     as.tlsext_tick_age_add = in->ext.tick_age_add;
 180 #ifndef OPENSSL_NO_PSK
 181     ssl_session_sinit(&as.psk_identity_hint, &psk_identity_hint,
 182                       in->psk_identity_hint);
 183     ssl_session_sinit(&as.psk_identity, &psk_identity, in->psk_identity);
 184 #endif                          /* OPENSSL_NO_PSK */
 185 #ifndef OPENSSL_NO_SRP
 186     ssl_session_sinit(&as.srp_username, &srp_username, in->srp_username);
 187 #endif                          /* OPENSSL_NO_SRP */
 188
 189     as.flags = in->flags;
 190     as.max_early_data = in->ext.max_early_data;
 191
 192     if (in->ext.alpn_selected == NULL)
 193         as.alpn_selected = NULL;
 194     else
 195         ssl_session_oinit(&as.alpn_selected, &alpn_selected,
 196                           in->ext.alpn_selected, in->ext.alpn_selected_len);
 197
 198     if (in->ext.tick_nonce == NULL)
 199         as.tick_nonce = NULL;
 200     else
 201         ssl_session_oinit(&as.tick_nonce, &tick_nonce,
 202                           in->ext.tick_nonce, in->ext.tick_nonce_len);
 203
 204     as.tlsext_max_fragment_len_mode = in->ext.max_fragment_len_mode;
 205
 206     if (in->ticket_appdata == NULL)
 207         as.ticket_appdata = NULL;
 208     else
 209         ssl_session_oinit(&as.ticket_appdata, &ticket_appdata,
 210                           in->ticket_appdata, in->ticket_appdata_len);
 211
 212     return i2d_SSL_SESSION_ASN1(&as, pp);
 213
 214 }
 215
 216 /* Utility functions for d2i_SSL_SESSION */
 217
 218 /* OPENSSL_strndup an OCTET STRING */
 219
 220 static int ssl_session_strndup(char **pdst, ASN1_OCTET_STRING *src)
 221 {
 222     OPENSSL_free(*pdst);
 223     *pdst = NULL;
 224     if (src == NULL)
 225         return 1;
 226     *pdst = OPENSSL_strndup((char *)src->data, src->length);
 227     if (*pdst == NULL)
 228         return 0;
 229     return 1;
 230 }
 231
 232 /* Copy an OCTET STRING, return error if it exceeds maximum length */
 233
 234 static int ssl_session_memcpy(unsigned char *dst, size_t *pdstlen,
 235                               ASN1_OCTET_STRING *src, size_t maxlen)
 236 {
 237     if (src == NULL) {
 238         *pdstlen = 0;
 239         return 1;
 240     }
 241     if (src->length < 0 || src->length > (int)maxlen)
 242         return 0;
 243     memcpy(dst, src->data, src->length);
 244     *pdstlen = src->length;
 245     return 1;
 246 }
 247
 248 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
 249                              long length)
 250 {
 251     long id;
 252     size_t tmpl;
 253     const unsigned char *p = *pp;
 254     SSL_SESSION_ASN1 *as = NULL;
 255     SSL_SESSION *ret = NULL;
 256
 257     as = d2i_SSL_SESSION_ASN1(NULL, &p, length);
 258     /* ASN.1 code returns suitable error */
 259     if (as == NULL)
 260         goto err;
 261
 262     if (!a || !*a) {
 263         ret = SSL_SESSION_new();
 264         if (ret == NULL)
 265             goto err;
 266     } else {
 267         ret = *a;
 268     }
 269
 270     if (as->version != SSL_SESSION_ASN1_VERSION) {
 271         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_UNKNOWN_SSL_VERSION);
 272         goto err;
 273     }
 274
 275     if ((as->ssl_version >> 8) != SSL3_VERSION_MAJOR
 276         && (as->ssl_version >> 8) != DTLS1_VERSION_MAJOR
 277         && as->ssl_version != DTLS1_BAD_VER) {
 278         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_UNSUPPORTED_SSL_VERSION);
 279         goto err;
 280     }
 281
 282     ret->ssl_version = (int)as->ssl_version;
 283
 284     if (as->cipher->length != 2) {
 285         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_CIPHER_CODE_WRONG_LENGTH);
 286         goto err;
 287     }
 288
 289     id = 0x03000000L | ((unsigned long)as->cipher->data[0] << 8L)
 290                      | (unsigned long)as->cipher->data[1];
 291
 292     ret->cipher_id = id;
 293     ret->cipher = ssl3_get_cipher_by_id(id);
 294     if (ret->cipher == NULL)
 295         goto err;
 296
 297     if (!ssl_session_memcpy(ret->session_id, &ret->session_id_length,
 298                             as->session_id, SSL3_MAX_SSL_SESSION_ID_LENGTH))
 299         goto err;
 300
 301     if (!ssl_session_memcpy(ret->master_key, &tmpl,
 302                             as->master_key, TLS13_MAX_RESUMPTION_MASTER_LENGTH))
 303         goto err;
 304
 305     ret->master_key_length = tmpl;
 306
 307     if (as->time != 0)
 308         ret->time = (long)as->time;
 309     else
 310         ret->time = (long)time(NULL);
 311
 312     if (as->timeout != 0)
 313         ret->timeout = (long)as->timeout;
 314     else
 315         ret->timeout = 3;
 316
 317     X509_free(ret->peer);
 318     ret->peer = as->peer;
 319     as->peer = NULL;
 320
 321     if (!ssl_session_memcpy(ret->sid_ctx, &ret->sid_ctx_length,
 322                             as->session_id_context, SSL_MAX_SID_CTX_LENGTH))
 323         goto err;
 324
 325     /* NB: this defaults to zero which is X509_V_OK */
 326     ret->verify_result = as->verify_result;
 327
 328     if (!ssl_session_strndup(&ret->ext.hostname, as->tlsext_hostname))
 329         goto err;
 330
 331 #ifndef OPENSSL_NO_PSK
 332     if (!ssl_session_strndup(&ret->psk_identity_hint, as->psk_identity_hint))
 333         goto err;
 334     if (!ssl_session_strndup(&ret->psk_identity, as->psk_identity))
 335         goto err;
 336 #endif
 337
 338     ret->ext.tick_lifetime_hint = (unsigned long)as->tlsext_tick_lifetime_hint;
 339     ret->ext.tick_age_add = as->tlsext_tick_age_add;
 340     if (as->tlsext_tick) {
 341         ret->ext.tick = as->tlsext_tick->data;
 342         ret->ext.ticklen = as->tlsext_tick->length;
 343         as->tlsext_tick->data = NULL;
 344     } else {
 345         ret->ext.tick = NULL;
 346     }
 347 #ifndef OPENSSL_NO_COMP
 348     if (as->comp_id) {
 349         if (as->comp_id->length != 1) {
 350             SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_BAD_LENGTH);
 351             goto err;
 352         }
 353         ret->compress_meth = as->comp_id->data[0];
 354     } else {
 355         ret->compress_meth = 0;
 356     }
 357 #endif
 358
 359 #ifndef OPENSSL_NO_SRP
 360     if (!ssl_session_strndup(&ret->srp_username, as->srp_username))
 361         goto err;
 362 #endif                          /* OPENSSL_NO_SRP */
 363     /* Flags defaults to zero which is fine */
 364     ret->flags = (int32_t)as->flags;
 365     ret->ext.max_early_data = as->max_early_data;
 366
 367     if (as->alpn_selected != NULL) {
 368         if (!ssl_session_strndup((char **)&ret->ext.alpn_selected,
 369                                  as->alpn_selected))
 370             goto err;
 371         ret->ext.alpn_selected_len = as->alpn_selected->length;
 372     } else {
 373         ret->ext.alpn_selected = NULL;
 374         ret->ext.alpn_selected_len = 0;
 375     }
 376
 377     if (as->tick_nonce != NULL) {
 378         ret->ext.tick_nonce = as->tick_nonce->data;
 379         ret->ext.tick_nonce_len = as->tick_nonce->length;
 380         as->tick_nonce->data = NULL;
 381     } else {
 382         ret->ext.tick_nonce = NULL;
 383         ret->ext.tick_nonce_len = 0;
 384     }
 385
 386     ret->ext.max_fragment_len_mode = as->tlsext_max_fragment_len_mode;
 387
 388     if (as->ticket_appdata != NULL) {
 389         ret->ticket_appdata = as->ticket_appdata->data;
 390         ret->ticket_appdata_len = as->ticket_appdata->length;
 391         as->ticket_appdata->data = NULL;
 392     } else {
 393         ret->ticket_appdata = NULL;
 394         ret->ticket_appdata_len = 0;
 395     }
 396
 397     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 398
 399     if ((a != NULL) && (*a == NULL))
 400         *a = ret;
 401     *pp = p;
 402     return ret;
 403
 404  err:
 405     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 406     if ((a == NULL) || (*a != ret))
 407         SSL_SESSION_free(ret);
 408     return NULL;
 409 }