ssl/ssl_asn1.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright 2005 Nokia. All rights reserved.
   4  *
   5  * Licensed under the Apache License 2.0 (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_local.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     uint32_t tlsext_max_fragment_len_mode;
  45     ASN1_OCTET_STRING *ticket_appdata;
  46 } SSL_SESSION_ASN1;
  47
  48 ASN1_SEQUENCE(SSL_SESSION_ASN1) = {
  49     ASN1_EMBED(SSL_SESSION_ASN1, version, UINT32),
  50     ASN1_EMBED(SSL_SESSION_ASN1, ssl_version, INT32),
  51     ASN1_SIMPLE(SSL_SESSION_ASN1, cipher, ASN1_OCTET_STRING),
  52     ASN1_SIMPLE(SSL_SESSION_ASN1, session_id, ASN1_OCTET_STRING),
  53     ASN1_SIMPLE(SSL_SESSION_ASN1, master_key, ASN1_OCTET_STRING),
  54     ASN1_IMP_OPT(SSL_SESSION_ASN1, key_arg, ASN1_OCTET_STRING, 0),
  55     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, time, ZINT64, 1),
  56     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, timeout, ZINT64, 2),
  57     ASN1_EXP_OPT(SSL_SESSION_ASN1, peer, X509, 3),
  58     ASN1_EXP_OPT(SSL_SESSION_ASN1, session_id_context, ASN1_OCTET_STRING, 4),
  59     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, verify_result, ZINT32, 5),
  60     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_hostname, ASN1_OCTET_STRING, 6),
  61 #ifndef OPENSSL_NO_PSK
  62     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity_hint, ASN1_OCTET_STRING, 7),
  63     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity, ASN1_OCTET_STRING, 8),
  64 #endif
  65     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_lifetime_hint, ZUINT64, 9),
  66     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_tick, ASN1_OCTET_STRING, 10),
  67     ASN1_EXP_OPT(SSL_SESSION_ASN1, comp_id, ASN1_OCTET_STRING, 11),
  68 #ifndef OPENSSL_NO_SRP
  69     ASN1_EXP_OPT(SSL_SESSION_ASN1, srp_username, ASN1_OCTET_STRING, 12),
  70 #endif
  71     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, flags, ZUINT64, 13),
  72     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_age_add, ZUINT32, 14),
  73     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, max_early_data, ZUINT32, 15),
  74     ASN1_EXP_OPT(SSL_SESSION_ASN1, alpn_selected, ASN1_OCTET_STRING, 16),
  75     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_max_fragment_len_mode, ZUINT32, 17),
  76     ASN1_EXP_OPT(SSL_SESSION_ASN1, ticket_appdata, ASN1_OCTET_STRING, 18)
  77 } static_ASN1_SEQUENCE_END(SSL_SESSION_ASN1)
  78
  79 IMPLEMENT_STATIC_ASN1_ENCODE_FUNCTIONS(SSL_SESSION_ASN1)
  80
  81 /* Utility functions for i2d_SSL_SESSION */
  82
  83 /* Initialise OCTET STRING from buffer and length */
  84
  85 static void ssl_session_oinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
  86                               const unsigned char *data, size_t len)
  87 {
  88     os->data = (unsigned char *)data; /* justified cast: data is not modified */
  89     os->length = (int)len;
  90     os->flags = 0;
  91     *dest = os;
  92 }
  93
  94 /* Initialise OCTET STRING from string */
  95 static void ssl_session_sinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
  96                               const char *data)
  97 {
  98     if (data != NULL)
  99         ssl_session_oinit(dest, os, (const unsigned char *)data, strlen(data));
 100     else
 101         *dest = NULL;
 102 }
 103
 104 int i2d_SSL_SESSION(const SSL_SESSION *in, unsigned char **pp)
 105 {
 106
 107     SSL_SESSION_ASN1 as;
 108
 109     ASN1_OCTET_STRING cipher;
 110     unsigned char cipher_data[2];
 111     ASN1_OCTET_STRING master_key, session_id, sid_ctx;
 112
 113 #ifndef OPENSSL_NO_COMP
 114     ASN1_OCTET_STRING comp_id;
 115     unsigned char comp_id_data;
 116 #endif
 117     ASN1_OCTET_STRING tlsext_hostname, tlsext_tick;
 118 #ifndef OPENSSL_NO_SRP
 119     ASN1_OCTET_STRING srp_username;
 120 #endif
 121 #ifndef OPENSSL_NO_PSK
 122     ASN1_OCTET_STRING psk_identity, psk_identity_hint;
 123 #endif
 124     ASN1_OCTET_STRING alpn_selected;
 125     ASN1_OCTET_STRING ticket_appdata;
 126
 127     long l;
 128
 129     if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
 130         return 0;
 131
 132     memset(&as, 0, sizeof(as));
 133
 134     as.version = SSL_SESSION_ASN1_VERSION;
 135     as.ssl_version = in->ssl_version;
 136
 137     if (in->cipher == NULL)
 138         l = in->cipher_id;
 139     else
 140         l = in->cipher->id;
 141     cipher_data[0] = ((unsigned char)(l >> 8L)) & 0xff;
 142     cipher_data[1] = ((unsigned char)(l)) & 0xff;
 143
 144     ssl_session_oinit(&as.cipher, &cipher, cipher_data, 2);
 145
 146 #ifndef OPENSSL_NO_COMP
 147     if (in->compress_meth) {
 148         comp_id_data = (unsigned char)in->compress_meth;
 149         ssl_session_oinit(&as.comp_id, &comp_id, &comp_id_data, 1);
 150     }
 151 #endif
 152
 153     ssl_session_oinit(&as.master_key, &master_key,
 154                       in->master_key, in->master_key_length);
 155
 156     ssl_session_oinit(&as.session_id, &session_id,
 157                       in->session_id, in->session_id_length);
 158
 159     ssl_session_oinit(&as.session_id_context, &sid_ctx,
 160                       in->sid_ctx, in->sid_ctx_length);
 161
 162     as.time = in->time;
 163     as.timeout = in->timeout;
 164     as.verify_result = in->verify_result;
 165
 166     as.peer = in->peer;
 167
 168     ssl_session_sinit(&as.tlsext_hostname, &tlsext_hostname,
 169                       in->ext.hostname);
 170     if (in->ext.tick) {
 171         ssl_session_oinit(&as.tlsext_tick, &tlsext_tick,
 172                           in->ext.tick, in->ext.ticklen);
 173     }
 174     if (in->ext.tick_lifetime_hint > 0)
 175         as.tlsext_tick_lifetime_hint = in->ext.tick_lifetime_hint;
 176     as.tlsext_tick_age_add = in->ext.tick_age_add;
 177 #ifndef OPENSSL_NO_PSK
 178     ssl_session_sinit(&as.psk_identity_hint, &psk_identity_hint,
 179                       in->psk_identity_hint);
 180     ssl_session_sinit(&as.psk_identity, &psk_identity, in->psk_identity);
 181 #endif                          /* OPENSSL_NO_PSK */
 182 #ifndef OPENSSL_NO_SRP
 183     ssl_session_sinit(&as.srp_username, &srp_username, in->srp_username);
 184 #endif                          /* OPENSSL_NO_SRP */
 185
 186     as.flags = in->flags;
 187     as.max_early_data = in->ext.max_early_data;
 188
 189     if (in->ext.alpn_selected == NULL)
 190         as.alpn_selected = NULL;
 191     else
 192         ssl_session_oinit(&as.alpn_selected, &alpn_selected,
 193                           in->ext.alpn_selected, in->ext.alpn_selected_len);
 194
 195     as.tlsext_max_fragment_len_mode = in->ext.max_fragment_len_mode;
 196
 197     if (in->ticket_appdata == NULL)
 198         as.ticket_appdata = NULL;
 199     else
 200         ssl_session_oinit(&as.ticket_appdata, &ticket_appdata,
 201                           in->ticket_appdata, in->ticket_appdata_len);
 202
 203     return i2d_SSL_SESSION_ASN1(&as, pp);
 204
 205 }
 206
 207 /* Utility functions for d2i_SSL_SESSION */
 208
 209 /* OPENSSL_strndup an OCTET STRING */
 210
 211 static int ssl_session_strndup(char **pdst, ASN1_OCTET_STRING *src)
 212 {
 213     OPENSSL_free(*pdst);
 214     *pdst = NULL;
 215     if (src == NULL)
 216         return 1;
 217     *pdst = OPENSSL_strndup((char *)src->data, src->length);
 218     if (*pdst == NULL)
 219         return 0;
 220     return 1;
 221 }
 222
 223 /* Copy an OCTET STRING, return error if it exceeds maximum length */
 224
 225 static int ssl_session_memcpy(unsigned char *dst, size_t *pdstlen,
 226                               ASN1_OCTET_STRING *src, size_t maxlen)
 227 {
 228     if (src == NULL) {
 229         *pdstlen = 0;
 230         return 1;
 231     }
 232     if (src->length < 0 || src->length > (int)maxlen)
 233         return 0;
 234     memcpy(dst, src->data, src->length);
 235     *pdstlen = src->length;
 236     return 1;
 237 }
 238
 239 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
 240                              long length)
 241 {
 242     long id;
 243     size_t tmpl;
 244     const unsigned char *p = *pp;
 245     SSL_SESSION_ASN1 *as = NULL;
 246     SSL_SESSION *ret = NULL;
 247
 248     as = d2i_SSL_SESSION_ASN1(NULL, &p, length);
 249     /* ASN.1 code returns suitable error */
 250     if (as == NULL)
 251         goto err;
 252
 253     if (a == NULL || *a == NULL) {
 254         ret = SSL_SESSION_new();
 255         if (ret == NULL)
 256             goto err;
 257     } else {
 258         ret = *a;
 259     }
 260
 261     if (as->version != SSL_SESSION_ASN1_VERSION) {
 262         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_UNKNOWN_SSL_VERSION);
 263         goto err;
 264     }
 265
 266     if ((as->ssl_version >> 8) != SSL3_VERSION_MAJOR
 267         && (as->ssl_version >> 8) != DTLS1_VERSION_MAJOR
 268         && as->ssl_version != DTLS1_BAD_VER) {
 269         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_UNSUPPORTED_SSL_VERSION);
 270         goto err;
 271     }
 272
 273     ret->ssl_version = (int)as->ssl_version;
 274
 275     if (as->cipher->length != 2) {
 276         SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_CIPHER_CODE_WRONG_LENGTH);
 277         goto err;
 278     }
 279
 280     id = 0x03000000L | ((unsigned long)as->cipher->data[0] << 8L)
 281                      | (unsigned long)as->cipher->data[1];
 282
 283     ret->cipher_id = id;
 284     ret->cipher = ssl3_get_cipher_by_id(id);
 285     if (ret->cipher == NULL)
 286         goto err;
 287
 288     if (!ssl_session_memcpy(ret->session_id, &ret->session_id_length,
 289                             as->session_id, SSL3_MAX_SSL_SESSION_ID_LENGTH))
 290         goto err;
 291
 292     if (!ssl_session_memcpy(ret->master_key, &tmpl,
 293                             as->master_key, TLS13_MAX_RESUMPTION_PSK_LENGTH))
 294         goto err;
 295
 296     ret->master_key_length = tmpl;
 297
 298     if (as->time != 0)
 299         ret->time = (long)as->time;
 300     else
 301         ret->time = (long)time(NULL);
 302
 303     if (as->timeout != 0)
 304         ret->timeout = (long)as->timeout;
 305     else
 306         ret->timeout = 3;
 307
 308     X509_free(ret->peer);
 309     ret->peer = as->peer;
 310     as->peer = NULL;
 311
 312     if (!ssl_session_memcpy(ret->sid_ctx, &ret->sid_ctx_length,
 313                             as->session_id_context, SSL_MAX_SID_CTX_LENGTH))
 314         goto err;
 315
 316     /* NB: this defaults to zero which is X509_V_OK */
 317     ret->verify_result = as->verify_result;
 318
 319     if (!ssl_session_strndup(&ret->ext.hostname, as->tlsext_hostname))
 320         goto err;
 321
 322 #ifndef OPENSSL_NO_PSK
 323     if (!ssl_session_strndup(&ret->psk_identity_hint, as->psk_identity_hint))
 324         goto err;
 325     if (!ssl_session_strndup(&ret->psk_identity, as->psk_identity))
 326         goto err;
 327 #endif
 328
 329     ret->ext.tick_lifetime_hint = (unsigned long)as->tlsext_tick_lifetime_hint;
 330     ret->ext.tick_age_add = as->tlsext_tick_age_add;
 331     OPENSSL_free(ret->ext.tick);
 332     if (as->tlsext_tick != NULL) {
 333         ret->ext.tick = as->tlsext_tick->data;
 334         ret->ext.ticklen = as->tlsext_tick->length;
 335         as->tlsext_tick->data = NULL;
 336     } else {
 337         ret->ext.tick = NULL;
 338     }
 339 #ifndef OPENSSL_NO_COMP
 340     if (as->comp_id) {
 341         if (as->comp_id->length != 1) {
 342             SSLerr(SSL_F_D2I_SSL_SESSION, SSL_R_BAD_LENGTH);
 343             goto err;
 344         }
 345         ret->compress_meth = as->comp_id->data[0];
 346     } else {
 347         ret->compress_meth = 0;
 348     }
 349 #endif
 350
 351 #ifndef OPENSSL_NO_SRP
 352     if (!ssl_session_strndup(&ret->srp_username, as->srp_username))
 353         goto err;
 354 #endif                          /* OPENSSL_NO_SRP */
 355     /* Flags defaults to zero which is fine */
 356     ret->flags = (int32_t)as->flags;
 357     ret->ext.max_early_data = as->max_early_data;
 358
 359     OPENSSL_free(ret->ext.alpn_selected);
 360     if (as->alpn_selected != NULL) {
 361         ret->ext.alpn_selected = as->alpn_selected->data;
 362         ret->ext.alpn_selected_len = as->alpn_selected->length;
 363         as->alpn_selected->data = NULL;
 364     } else {
 365         ret->ext.alpn_selected = NULL;
 366         ret->ext.alpn_selected_len = 0;
 367     }
 368
 369     ret->ext.max_fragment_len_mode = as->tlsext_max_fragment_len_mode;
 370
 371     OPENSSL_free(ret->ticket_appdata);
 372     if (as->ticket_appdata != NULL) {
 373         ret->ticket_appdata = as->ticket_appdata->data;
 374         ret->ticket_appdata_len = as->ticket_appdata->length;
 375         as->ticket_appdata->data = NULL;
 376     } else {
 377         ret->ticket_appdata = NULL;
 378         ret->ticket_appdata_len = 0;
 379     }
 380
 381     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 382
 383     if ((a != NULL) && (*a == NULL))
 384         *a = ret;
 385     *pp = p;
 386     return ret;
 387
 388  err:
 389     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 390     if ((a == NULL) || (*a != ret))
 391         SSL_SESSION_free(ret);
 392     return NULL;
 393 }