ssl/ssl_asn1.c

   1 /*
   2  * Copyright 1995-2023 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/encoder.h>
  16 #include <openssl/x509.h>
  17
  18 typedef struct {
  19     uint32_t version;
  20     int32_t ssl_version;
  21     ASN1_OCTET_STRING *cipher;
  22     ASN1_OCTET_STRING *comp_id;
  23     ASN1_OCTET_STRING *master_key;
  24     ASN1_OCTET_STRING *session_id;
  25     ASN1_OCTET_STRING *key_arg;
  26     int64_t time;
  27     int64_t timeout;
  28     X509 *peer;
  29     ASN1_OCTET_STRING *session_id_context;
  30     int32_t verify_result;
  31     ASN1_OCTET_STRING *tlsext_hostname;
  32     uint64_t tlsext_tick_lifetime_hint;
  33     uint32_t tlsext_tick_age_add;
  34     ASN1_OCTET_STRING *tlsext_tick;
  35 #ifndef OPENSSL_NO_PSK
  36     ASN1_OCTET_STRING *psk_identity_hint;
  37     ASN1_OCTET_STRING *psk_identity;
  38 #endif
  39 #ifndef OPENSSL_NO_SRP
  40     ASN1_OCTET_STRING *srp_username;
  41 #endif
  42     uint64_t flags;
  43     uint32_t max_early_data;
  44     ASN1_OCTET_STRING *alpn_selected;
  45     uint32_t tlsext_max_fragment_len_mode;
  46     ASN1_OCTET_STRING *ticket_appdata;
  47     uint32_t kex_group;
  48     ASN1_OCTET_STRING *peer_rpk;
  49 } SSL_SESSION_ASN1;
  50
  51 ASN1_SEQUENCE(SSL_SESSION_ASN1) = {
  52     ASN1_EMBED(SSL_SESSION_ASN1, version, UINT32),
  53     ASN1_EMBED(SSL_SESSION_ASN1, ssl_version, INT32),
  54     ASN1_SIMPLE(SSL_SESSION_ASN1, cipher, ASN1_OCTET_STRING),
  55     ASN1_SIMPLE(SSL_SESSION_ASN1, session_id, ASN1_OCTET_STRING),
  56     ASN1_SIMPLE(SSL_SESSION_ASN1, master_key, ASN1_OCTET_STRING),
  57     ASN1_IMP_OPT(SSL_SESSION_ASN1, key_arg, ASN1_OCTET_STRING, 0),
  58     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, time, ZINT64, 1),
  59     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, timeout, ZINT64, 2),
  60     ASN1_EXP_OPT(SSL_SESSION_ASN1, peer, X509, 3),
  61     ASN1_EXP_OPT(SSL_SESSION_ASN1, session_id_context, ASN1_OCTET_STRING, 4),
  62     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, verify_result, ZINT32, 5),
  63     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_hostname, ASN1_OCTET_STRING, 6),
  64 #ifndef OPENSSL_NO_PSK
  65     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity_hint, ASN1_OCTET_STRING, 7),
  66     ASN1_EXP_OPT(SSL_SESSION_ASN1, psk_identity, ASN1_OCTET_STRING, 8),
  67 #endif
  68     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_lifetime_hint, ZUINT64, 9),
  69     ASN1_EXP_OPT(SSL_SESSION_ASN1, tlsext_tick, ASN1_OCTET_STRING, 10),
  70     ASN1_EXP_OPT(SSL_SESSION_ASN1, comp_id, ASN1_OCTET_STRING, 11),
  71 #ifndef OPENSSL_NO_SRP
  72     ASN1_EXP_OPT(SSL_SESSION_ASN1, srp_username, ASN1_OCTET_STRING, 12),
  73 #endif
  74     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, flags, ZUINT64, 13),
  75     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_tick_age_add, ZUINT32, 14),
  76     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, max_early_data, ZUINT32, 15),
  77     ASN1_EXP_OPT(SSL_SESSION_ASN1, alpn_selected, ASN1_OCTET_STRING, 16),
  78     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, tlsext_max_fragment_len_mode, ZUINT32, 17),
  79     ASN1_EXP_OPT(SSL_SESSION_ASN1, ticket_appdata, ASN1_OCTET_STRING, 18),
  80     ASN1_EXP_OPT_EMBED(SSL_SESSION_ASN1, kex_group, UINT32, 19),
  81     ASN1_EXP_OPT(SSL_SESSION_ASN1, peer_rpk, ASN1_OCTET_STRING, 20)
  82 } static_ASN1_SEQUENCE_END(SSL_SESSION_ASN1)
  83
  84 IMPLEMENT_STATIC_ASN1_ENCODE_FUNCTIONS(SSL_SESSION_ASN1)
  85
  86 /* Utility functions for i2d_SSL_SESSION */
  87
  88 /* Initialise OCTET STRING from buffer and length */
  89
  90 static void ssl_session_oinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
  91                               const unsigned char *data, size_t len)
  92 {
  93     os->data = (unsigned char *)data; /* justified cast: data is not modified */
  94     os->length = (int)len;
  95     os->flags = 0;
  96     *dest = os;
  97 }
  98
  99 /* Initialise OCTET STRING from string */
 100 static void ssl_session_sinit(ASN1_OCTET_STRING **dest, ASN1_OCTET_STRING *os,
 101                               const char *data)
 102 {
 103     if (data != NULL)
 104         ssl_session_oinit(dest, os, (const unsigned char *)data, strlen(data));
 105     else
 106         *dest = NULL;
 107 }
 108
 109 int i2d_SSL_SESSION(const SSL_SESSION *in, unsigned char **pp)
 110 {
 111
 112     SSL_SESSION_ASN1 as;
 113
 114     ASN1_OCTET_STRING cipher;
 115     unsigned char cipher_data[2];
 116     ASN1_OCTET_STRING master_key, session_id, sid_ctx;
 117
 118 #ifndef OPENSSL_NO_COMP
 119     ASN1_OCTET_STRING comp_id;
 120     unsigned char comp_id_data;
 121 #endif
 122     ASN1_OCTET_STRING tlsext_hostname, tlsext_tick;
 123 #ifndef OPENSSL_NO_SRP
 124     ASN1_OCTET_STRING srp_username;
 125 #endif
 126 #ifndef OPENSSL_NO_PSK
 127     ASN1_OCTET_STRING psk_identity, psk_identity_hint;
 128 #endif
 129     ASN1_OCTET_STRING alpn_selected;
 130     ASN1_OCTET_STRING ticket_appdata;
 131     ASN1_OCTET_STRING peer_rpk;
 132
 133     long l;
 134     int ret;
 135
 136     if ((in == NULL) || ((in->cipher == NULL) && (in->cipher_id == 0)))
 137         return 0;
 138
 139     memset(&as, 0, sizeof(as));
 140
 141     as.version = SSL_SESSION_ASN1_VERSION;
 142     as.ssl_version = in->ssl_version;
 143
 144     as.kex_group = in->kex_group;
 145
 146     if (in->cipher == NULL)
 147         l = in->cipher_id;
 148     else
 149         l = in->cipher->id;
 150     cipher_data[0] = ((unsigned char)(l >> 8L)) & 0xff;
 151     cipher_data[1] = ((unsigned char)(l)) & 0xff;
 152
 153     ssl_session_oinit(&as.cipher, &cipher, cipher_data, 2);
 154
 155 #ifndef OPENSSL_NO_COMP
 156     if (in->compress_meth) {
 157         comp_id_data = (unsigned char)in->compress_meth;
 158         ssl_session_oinit(&as.comp_id, &comp_id, &comp_id_data, 1);
 159     }
 160 #endif
 161
 162     ssl_session_oinit(&as.master_key, &master_key,
 163                       in->master_key, in->master_key_length);
 164
 165     ssl_session_oinit(&as.session_id, &session_id,
 166                       in->session_id, in->session_id_length);
 167
 168     ssl_session_oinit(&as.session_id_context, &sid_ctx,
 169                       in->sid_ctx, in->sid_ctx_length);
 170
 171     as.time = (int64_t)ossl_time_to_time_t(in->time);
 172     as.timeout = (int64_t)ossl_time2seconds(in->timeout);
 173     as.verify_result = in->verify_result;
 174
 175     as.peer = in->peer;
 176
 177     as.peer_rpk = NULL;
 178     peer_rpk.data = NULL;
 179     if (in->peer_rpk != NULL) {
 180         peer_rpk.length = i2d_PUBKEY(in->peer_rpk, &peer_rpk.data);
 181         if (peer_rpk.length > 0 && peer_rpk.data != NULL)
 182             as.peer_rpk = &peer_rpk;
 183     }
 184
 185     ssl_session_sinit(&as.tlsext_hostname, &tlsext_hostname,
 186                       in->ext.hostname);
 187     if (in->ext.tick) {
 188         ssl_session_oinit(&as.tlsext_tick, &tlsext_tick,
 189                           in->ext.tick, in->ext.ticklen);
 190     }
 191     if (in->ext.tick_lifetime_hint > 0)
 192         as.tlsext_tick_lifetime_hint = in->ext.tick_lifetime_hint;
 193     as.tlsext_tick_age_add = in->ext.tick_age_add;
 194 #ifndef OPENSSL_NO_PSK
 195     ssl_session_sinit(&as.psk_identity_hint, &psk_identity_hint,
 196                       in->psk_identity_hint);
 197     ssl_session_sinit(&as.psk_identity, &psk_identity, in->psk_identity);
 198 #endif                          /* OPENSSL_NO_PSK */
 199 #ifndef OPENSSL_NO_SRP
 200     ssl_session_sinit(&as.srp_username, &srp_username, in->srp_username);
 201 #endif                          /* OPENSSL_NO_SRP */
 202
 203     as.flags = in->flags;
 204     as.max_early_data = in->ext.max_early_data;
 205
 206     if (in->ext.alpn_selected == NULL)
 207         as.alpn_selected = NULL;
 208     else
 209         ssl_session_oinit(&as.alpn_selected, &alpn_selected,
 210                           in->ext.alpn_selected, in->ext.alpn_selected_len);
 211
 212     as.tlsext_max_fragment_len_mode = in->ext.max_fragment_len_mode;
 213
 214     if (in->ticket_appdata == NULL)
 215         as.ticket_appdata = NULL;
 216     else
 217         ssl_session_oinit(&as.ticket_appdata, &ticket_appdata,
 218                           in->ticket_appdata, in->ticket_appdata_len);
 219
 220     ret = i2d_SSL_SESSION_ASN1(&as, pp);
 221     OPENSSL_free(peer_rpk.data);
 222     return ret;
 223 }
 224
 225 /* Utility functions for d2i_SSL_SESSION */
 226
 227 /* OPENSSL_strndup an OCTET STRING */
 228
 229 static int ssl_session_strndup(char **pdst, ASN1_OCTET_STRING *src)
 230 {
 231     OPENSSL_free(*pdst);
 232     *pdst = NULL;
 233     if (src == NULL)
 234         return 1;
 235     *pdst = OPENSSL_strndup((char *)src->data, src->length);
 236     if (*pdst == NULL)
 237         return 0;
 238     return 1;
 239 }
 240
 241 /* Copy an OCTET STRING, return error if it exceeds maximum length */
 242
 243 static int ssl_session_memcpy(unsigned char *dst, size_t *pdstlen,
 244                               ASN1_OCTET_STRING *src, size_t maxlen)
 245 {
 246     if (src == NULL || src->length == 0) {
 247         *pdstlen = 0;
 248         return 1;
 249     }
 250     if (src->length < 0 || src->length > (int)maxlen)
 251         return 0;
 252     memcpy(dst, src->data, src->length);
 253     *pdstlen = src->length;
 254     return 1;
 255 }
 256
 257 SSL_SESSION *d2i_SSL_SESSION(SSL_SESSION **a, const unsigned char **pp,
 258                              long length)
 259 {
 260     return d2i_SSL_SESSION_ex(a, pp, length, NULL, NULL);
 261 }
 262 SSL_SESSION *d2i_SSL_SESSION_ex(SSL_SESSION **a, const unsigned char **pp,
 263                                 long length, OSSL_LIB_CTX *libctx,
 264                                 const char *propq)
 265 {
 266     long id;
 267     size_t tmpl;
 268     const unsigned char *p = *pp;
 269     SSL_SESSION_ASN1 *as = NULL;
 270     SSL_SESSION *ret = NULL;
 271
 272     as = d2i_SSL_SESSION_ASN1(NULL, &p, length);
 273     /* ASN.1 code returns suitable error */
 274     if (as == NULL)
 275         goto err;
 276
 277     if (a == NULL || *a == NULL) {
 278         ret = SSL_SESSION_new();
 279         if (ret == NULL)
 280             goto err;
 281     } else {
 282         ret = *a;
 283     }
 284
 285     if (as->version != SSL_SESSION_ASN1_VERSION) {
 286         ERR_raise(ERR_LIB_SSL, SSL_R_UNKNOWN_SSL_VERSION);
 287         goto err;
 288     }
 289
 290     if ((as->ssl_version >> 8) != SSL3_VERSION_MAJOR
 291         && (as->ssl_version >> 8) != DTLS1_VERSION_MAJOR
 292         && as->ssl_version != DTLS1_BAD_VER) {
 293         ERR_raise(ERR_LIB_SSL, SSL_R_UNSUPPORTED_SSL_VERSION);
 294         goto err;
 295     }
 296
 297     ret->ssl_version = (int)as->ssl_version;
 298
 299     ret->kex_group = as->kex_group;
 300
 301     if (as->cipher->length != 2) {
 302         ERR_raise(ERR_LIB_SSL, SSL_R_CIPHER_CODE_WRONG_LENGTH);
 303         goto err;
 304     }
 305
 306     id = 0x03000000L | ((unsigned long)as->cipher->data[0] << 8L)
 307                      | (unsigned long)as->cipher->data[1];
 308
 309     ret->cipher_id = id;
 310     ret->cipher = ssl3_get_cipher_by_id(id);
 311     if (ret->cipher == NULL)
 312         goto err;
 313
 314     if (!ssl_session_memcpy(ret->session_id, &ret->session_id_length,
 315                             as->session_id, SSL3_MAX_SSL_SESSION_ID_LENGTH))
 316         goto err;
 317
 318     if (!ssl_session_memcpy(ret->master_key, &tmpl,
 319                             as->master_key, TLS13_MAX_RESUMPTION_PSK_LENGTH))
 320         goto err;
 321
 322     ret->master_key_length = tmpl;
 323
 324     if (as->time != 0)
 325         ret->time = ossl_time_from_time_t(as->time);
 326     else
 327         ret->time = ossl_time_now();
 328
 329     if (as->timeout != 0)
 330         ret->timeout = ossl_seconds2time(as->timeout);
 331     else
 332         ret->timeout = ossl_seconds2time(3);
 333     ssl_session_calculate_timeout(ret);
 334
 335     X509_free(ret->peer);
 336     ret->peer = as->peer;
 337     as->peer = NULL;
 338
 339     EVP_PKEY_free(ret->peer_rpk);
 340     ret->peer_rpk = NULL;
 341     if (as->peer_rpk != NULL) {
 342         const unsigned char *data = as->peer_rpk->data;
 343
 344         /*
 345          * |data| is incremented; we don't want to lose original ptr
 346          */
 347         ret->peer_rpk = d2i_PUBKEY_ex(NULL, &data, as->peer_rpk->length, libctx, propq);
 348         if (ret->peer_rpk == NULL)
 349             goto err;
 350     }
 351
 352     if (!ssl_session_memcpy(ret->sid_ctx, &ret->sid_ctx_length,
 353                             as->session_id_context, SSL_MAX_SID_CTX_LENGTH))
 354         goto err;
 355
 356     /* NB: this defaults to zero which is X509_V_OK */
 357     ret->verify_result = as->verify_result;
 358
 359     if (!ssl_session_strndup(&ret->ext.hostname, as->tlsext_hostname))
 360         goto err;
 361
 362 #ifndef OPENSSL_NO_PSK
 363     if (!ssl_session_strndup(&ret->psk_identity_hint, as->psk_identity_hint))
 364         goto err;
 365     if (!ssl_session_strndup(&ret->psk_identity, as->psk_identity))
 366         goto err;
 367 #endif
 368
 369     ret->ext.tick_lifetime_hint = (unsigned long)as->tlsext_tick_lifetime_hint;
 370     ret->ext.tick_age_add = as->tlsext_tick_age_add;
 371     OPENSSL_free(ret->ext.tick);
 372     if (as->tlsext_tick != NULL) {
 373         ret->ext.tick = as->tlsext_tick->data;
 374         ret->ext.ticklen = as->tlsext_tick->length;
 375         as->tlsext_tick->data = NULL;
 376     } else {
 377         ret->ext.tick = NULL;
 378     }
 379 #ifndef OPENSSL_NO_COMP
 380     if (as->comp_id) {
 381         if (as->comp_id->length != 1) {
 382             ERR_raise(ERR_LIB_SSL, SSL_R_BAD_LENGTH);
 383             goto err;
 384         }
 385         ret->compress_meth = as->comp_id->data[0];
 386     } else {
 387         ret->compress_meth = 0;
 388     }
 389 #endif
 390
 391 #ifndef OPENSSL_NO_SRP
 392     if (!ssl_session_strndup(&ret->srp_username, as->srp_username))
 393         goto err;
 394 #endif                          /* OPENSSL_NO_SRP */
 395     /* Flags defaults to zero which is fine */
 396     ret->flags = (int32_t)as->flags;
 397     ret->ext.max_early_data = as->max_early_data;
 398
 399     OPENSSL_free(ret->ext.alpn_selected);
 400     if (as->alpn_selected != NULL) {
 401         ret->ext.alpn_selected = as->alpn_selected->data;
 402         ret->ext.alpn_selected_len = as->alpn_selected->length;
 403         as->alpn_selected->data = NULL;
 404     } else {
 405         ret->ext.alpn_selected = NULL;
 406         ret->ext.alpn_selected_len = 0;
 407     }
 408
 409     ret->ext.max_fragment_len_mode = as->tlsext_max_fragment_len_mode;
 410
 411     OPENSSL_free(ret->ticket_appdata);
 412     if (as->ticket_appdata != NULL) {
 413         ret->ticket_appdata = as->ticket_appdata->data;
 414         ret->ticket_appdata_len = as->ticket_appdata->length;
 415         as->ticket_appdata->data = NULL;
 416     } else {
 417         ret->ticket_appdata = NULL;
 418         ret->ticket_appdata_len = 0;
 419     }
 420
 421     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 422
 423     if ((a != NULL) && (*a == NULL))
 424         *a = ret;
 425     *pp = p;
 426     return ret;
 427
 428  err:
 429     M_ASN1_free_of(as, SSL_SESSION_ASN1);
 430     if ((a == NULL) || (*a != ret))
 431         SSL_SESSION_free(ret);
 432     return NULL;
 433 }