providers/implementations/serializers/serializer_common.c

   1 /*
   2  * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <openssl/opensslconf.h> /* SIXTY_FOUR_BIT_LONG, ... */
  11 #include <openssl/err.h>
  12 #include <openssl/pem.h>         /* PEM_BUFSIZE */
  13 #include <openssl/pkcs12.h>      /* PKCS8_encrypt() */
  14 #include <openssl/types.h>
  15 #include <openssl/x509.h>        /* i2d_X509_PUBKEY_bio() */
  16 #include "crypto/bn.h"           /* bn_get_words() */
  17 #include "crypto/ctype.h"
  18 #include "crypto/ecx.h"
  19 #include "prov/bio.h"            /* ossl_prov_bio_printf() */
  20 #include "prov/implementations.h"
  21 #include "prov/providercommonerr.h" /* PROV_R_READ_KEY */
  22 #include "serializer_local.h"
  23
  24 static PKCS8_PRIV_KEY_INFO *
  25 ossl_prov_p8info_from_obj(const void *obj, int obj_nid,
  26                           void *params,
  27                           int params_type,
  28                           int (*k2d)(const void *obj,
  29                                      unsigned char **pder))
  30 {
  31     /* der, derlen store the key DER output and its length */
  32     unsigned char *der = NULL;
  33     int derlen;
  34     /* The final PKCS#8 info */
  35     PKCS8_PRIV_KEY_INFO *p8info = NULL;
  36
  37
  38     if ((p8info = PKCS8_PRIV_KEY_INFO_new()) == NULL
  39         || (derlen = k2d(obj, &der)) <= 0
  40         || !PKCS8_pkey_set0(p8info, OBJ_nid2obj(obj_nid), 0,
  41                             params_type, params, der, derlen)) {
  42         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
  43         PKCS8_PRIV_KEY_INFO_free(p8info);
  44         OPENSSL_free(der);
  45         p8info = NULL;
  46     }
  47
  48     return p8info;
  49 }
  50
  51 static X509_SIG *ossl_prov_encp8_from_p8info(PKCS8_PRIV_KEY_INFO *p8info,
  52                                              struct pkcs8_encrypt_ctx_st *ctx)
  53 {
  54     X509_SIG *p8 = NULL;
  55     char buf[PEM_BUFSIZE];
  56     const void *kstr = ctx->cipher_pass;
  57     size_t klen = ctx->cipher_pass_length;
  58
  59     if (ctx->cipher == NULL)
  60         return NULL;
  61
  62     if (kstr == NULL) {
  63         if (!ctx->cb(buf, sizeof(buf), &klen, NULL, ctx->cbarg)) {
  64             ERR_raise(ERR_LIB_PROV, PROV_R_READ_KEY);
  65             return NULL;
  66         }
  67         kstr = buf;
  68     }
  69     /* NID == -1 means "standard" */
  70     p8 = PKCS8_encrypt(-1, ctx->cipher, kstr, klen, NULL, 0, 0, p8info);
  71     if (kstr == buf)
  72         OPENSSL_cleanse(buf, klen);
  73     return p8;
  74 }
  75
  76 static X509_SIG *ossl_prov_encp8_from_obj(const void *obj, int obj_nid,
  77                                           void *params,
  78                                           int params_type,
  79                                           int (*k2d)(const void *obj,
  80                                                      unsigned char **pder),
  81                                           struct pkcs8_encrypt_ctx_st *ctx)
  82 {
  83     PKCS8_PRIV_KEY_INFO *p8info =
  84         ossl_prov_p8info_from_obj(obj, obj_nid, params, params_type, k2d);
  85     X509_SIG *p8 = ossl_prov_encp8_from_p8info(p8info, ctx);
  86
  87     PKCS8_PRIV_KEY_INFO_free(p8info);
  88     return p8;
  89 }
  90
  91 static X509_PUBKEY *ossl_prov_pubkey_from_obj(const void *obj, int obj_nid,
  92                                               void *params,
  93                                               int params_type,
  94                                               int (*k2d)(const void *obj,
  95                                                          unsigned char **pder))
  96 {
  97     /* der, derlen store the key DER output and its length */
  98     unsigned char *der = NULL;
  99     int derlen;
 100     /* The final X509_PUBKEY */
 101     X509_PUBKEY *xpk = NULL;
 102
 103
 104     if ((xpk = X509_PUBKEY_new()) == NULL
 105         || (derlen = k2d(obj, &der)) <= 0
 106         || !X509_PUBKEY_set0_param(xpk, OBJ_nid2obj(obj_nid),
 107                                    params_type, params, der, derlen)) {
 108         ERR_raise(ERR_LIB_PROV, ERR_R_MALLOC_FAILURE);
 109         X509_PUBKEY_free(xpk);
 110         OPENSSL_free(der);
 111         xpk = NULL;
 112     }
 113
 114     return xpk;
 115 }
 116
 117 OSSL_FUNC_keymgmt_new_fn *ossl_prov_get_keymgmt_new(const OSSL_DISPATCH *fns)
 118 {
 119     /* Pilfer the keymgmt dispatch table */
 120     for (; fns->function_id != 0; fns++)
 121         if (fns->function_id == OSSL_FUNC_KEYMGMT_NEW)
 122             return OSSL_FUNC_keymgmt_new(fns);
 123
 124     return NULL;
 125 }
 126
 127 OSSL_FUNC_keymgmt_free_fn *ossl_prov_get_keymgmt_free(const OSSL_DISPATCH *fns)
 128 {
 129     /* Pilfer the keymgmt dispatch table */
 130     for (; fns->function_id != 0; fns++)
 131         if (fns->function_id == OSSL_FUNC_KEYMGMT_FREE)
 132             return OSSL_FUNC_keymgmt_free(fns);
 133
 134     return NULL;
 135 }
 136
 137 OSSL_FUNC_keymgmt_import_fn *ossl_prov_get_keymgmt_import(const OSSL_DISPATCH *fns)
 138 {
 139     /* Pilfer the keymgmt dispatch table */
 140     for (; fns->function_id != 0; fns++)
 141         if (fns->function_id == OSSL_FUNC_KEYMGMT_IMPORT)
 142             return OSSL_FUNC_keymgmt_import(fns);
 143
 144     return NULL;
 145 }
 146
 147 OSSL_FUNC_keymgmt_export_fn *ossl_prov_get_keymgmt_export(const OSSL_DISPATCH *fns)
 148 {
 149     /* Pilfer the keymgmt dispatch table */
 150     for (; fns->function_id != 0; fns++)
 151         if (fns->function_id == OSSL_FUNC_KEYMGMT_EXPORT)
 152             return OSSL_FUNC_keymgmt_export(fns);
 153
 154     return NULL;
 155 }
 156
 157 # ifdef SIXTY_FOUR_BIT_LONG
 158 #  define BN_FMTu "%lu"
 159 #  define BN_FMTx "%lx"
 160 # endif
 161
 162 # ifdef SIXTY_FOUR_BIT
 163 #  define BN_FMTu "%llu"
 164 #  define BN_FMTx "%llx"
 165 # endif
 166
 167 # ifdef THIRTY_TWO_BIT
 168 #  define BN_FMTu "%u"
 169 #  define BN_FMTx "%x"
 170 # endif
 171
 172 int ossl_prov_print_labeled_bignum(BIO *out, const char *label,
 173                                    const BIGNUM *bn)
 174 {
 175     int ret = 0, use_sep = 0;
 176     char *hex_str = NULL, *p;
 177     const char spaces[] = "    ";
 178     const char *post_label_spc = " ";
 179
 180     const char *neg = "";
 181     int bytes;
 182
 183     if (bn == NULL)
 184         return 0;
 185     if (label == NULL) {
 186         label = "";
 187         post_label_spc = "";
 188     }
 189
 190     if (BN_is_zero(bn))
 191         return BIO_printf(out, "%s%s0\n", label, post_label_spc);
 192
 193     if (BN_num_bytes(bn) <= BN_BYTES) {
 194         BN_ULONG *words = bn_get_words(bn);
 195
 196         if (BN_is_negative(bn))
 197             neg = "-";
 198
 199         return BIO_printf(out, "%s%s%s" BN_FMTu " (%s0x" BN_FMTx ")\n",
 200                           label, post_label_spc, neg, words[0], neg, words[0]);
 201     }
 202
 203     hex_str = BN_bn2hex(bn);
 204     p = hex_str;
 205     if (*p == '-') {
 206         ++p;
 207         neg = " (Negative)";
 208     }
 209     if (BIO_printf(out, "%s%s\n", label, neg) <= 0)
 210         goto err;
 211
 212     /* Keep track of how many bytes we have printed out so far */
 213     bytes = 0;
 214
 215     if (BIO_printf(out, "%s", spaces) <= 0)
 216         goto err;
 217
 218     /* Add a leading 00 if the top bit is set */
 219     if (*p >= '8') {
 220         if (BIO_printf(out, "%02x", 0) <= 0)
 221             goto err;
 222         ++bytes;
 223         use_sep = 1;
 224     }
 225     while (*p != '\0') {
 226         /* Do a newline after every 15 hex bytes + add the space indent */
 227         if ((bytes % 15) == 0 && bytes > 0) {
 228             if (BIO_printf(out, ":\n%s", spaces) <= 0)
 229                 goto err;
 230             use_sep = 0; /* The first byte on the next line doesnt have a : */
 231         }
 232         if (BIO_printf(out, "%s%c%c", use_sep ? ":" : "",
 233                        ossl_tolower(p[0]), ossl_tolower(p[1])) <= 0)
 234             goto err;
 235         ++bytes;
 236         p += 2;
 237         use_sep = 1;
 238     }
 239     if (BIO_printf(out, "\n") <= 0)
 240         goto err;
 241     ret = 1;
 242 err:
 243     OPENSSL_free(hex_str);
 244     return ret;
 245 }
 246
 247 /* Number of octets per line */
 248 #define LABELED_BUF_PRINT_WIDTH    15
 249
 250 int ossl_prov_print_labeled_buf(BIO *out, const char *label,
 251                                 const unsigned char *buf, size_t buflen)
 252 {
 253     size_t i;
 254
 255     if (BIO_printf(out, "%s\n", label) <= 0)
 256         return 0;
 257
 258     for (i = 0; i < buflen; i++) {
 259         if ((i % LABELED_BUF_PRINT_WIDTH) == 0) {
 260             if (i > 0 && BIO_printf(out, "\n") <= 0)
 261                 return 0;
 262             if (BIO_printf(out, "    ") <= 0)
 263                 return 0;
 264         }
 265
 266         if (BIO_printf(out, "%02x%s", buf[i],
 267                                  (i == buflen - 1) ? "" : ":") <= 0)
 268             return 0;
 269     }
 270     if (BIO_printf(out, "\n") <= 0)
 271         return 0;
 272
 273     return 1;
 274 }
 275
 276 /* p2s = param to asn1, k2d = key to der */
 277 int ossl_prov_write_priv_der_from_obj(BIO *out, const void *obj, int obj_nid,
 278                                       int (*p2s)(const void *obj, int nid,
 279                                                  void **str,
 280                                                  int *strtype),
 281                                       int (*k2d)(const void *obj,
 282                                                  unsigned char **pder),
 283                                       struct pkcs8_encrypt_ctx_st *ctx)
 284 {
 285     int ret = 0;
 286     void *str = NULL;
 287     int strtype = V_ASN1_UNDEF;
 288
 289     if (p2s != NULL && !p2s(obj, obj_nid, &str, &strtype))
 290         return 0;
 291
 292     if (ctx->cipher_intent) {
 293         X509_SIG *p8 =
 294             ossl_prov_encp8_from_obj(obj, obj_nid, str, strtype, k2d, ctx);
 295
 296         if (p8 != NULL)
 297             ret = i2d_PKCS8_bio(out, p8);
 298
 299         X509_SIG_free(p8);
 300     } else {
 301         PKCS8_PRIV_KEY_INFO *p8info =
 302             ossl_prov_p8info_from_obj(obj, obj_nid, str, strtype, k2d);
 303
 304         if (p8info != NULL)
 305             ret = i2d_PKCS8_PRIV_KEY_INFO_bio(out, p8info);
 306
 307         PKCS8_PRIV_KEY_INFO_free(p8info);
 308     }
 309
 310     return ret;
 311 }
 312
 313 int ossl_prov_write_priv_pem_from_obj(BIO *out, const void *obj, int obj_nid,
 314                                       int (*p2s)(const void *obj, int nid,
 315                                                  void **str,
 316                                                  int *strtype),
 317                                       int (*k2d)(const void *obj,
 318                                                  unsigned char **pder),
 319                                       struct pkcs8_encrypt_ctx_st *ctx)
 320 {
 321     int ret = 0;
 322     void *str = NULL;
 323     int strtype = V_ASN1_UNDEF;
 324
 325     if (p2s != NULL && !p2s(obj, obj_nid, &str, &strtype))
 326         return 0;
 327
 328     if (ctx->cipher_intent) {
 329         X509_SIG *p8 = ossl_prov_encp8_from_obj(obj, obj_nid, str, strtype,
 330                                                 k2d, ctx);
 331
 332         if (p8 != NULL)
 333             ret = PEM_write_bio_PKCS8(out, p8);
 334
 335         X509_SIG_free(p8);
 336     } else {
 337         PKCS8_PRIV_KEY_INFO *p8info =
 338             ossl_prov_p8info_from_obj(obj, obj_nid, str, strtype, k2d);
 339
 340         if (p8info != NULL)
 341             ret = PEM_write_bio_PKCS8_PRIV_KEY_INFO(out, p8info);
 342
 343         PKCS8_PRIV_KEY_INFO_free(p8info);
 344     }
 345
 346     return ret;
 347 }
 348
 349 int ossl_prov_write_pub_der_from_obj(BIO *out, const void *obj, int obj_nid,
 350                                      int (*p2s)(const void *obj, int nid,
 351                                                 void **str,
 352                                                 int *strtype),
 353                                      int (*k2d)(const void *obj,
 354                                                 unsigned char **pder))
 355 {
 356     int ret = 0;
 357     void *str = NULL;
 358     int strtype = V_ASN1_UNDEF;
 359     X509_PUBKEY *xpk = NULL;
 360
 361     if (p2s != NULL && !p2s(obj, obj_nid, &str, &strtype))
 362         return 0;
 363
 364     xpk = ossl_prov_pubkey_from_obj(obj, obj_nid, str, strtype, k2d);
 365
 366     if (xpk != NULL)
 367         ret = i2d_X509_PUBKEY_bio(out, xpk);
 368
 369     /* Also frees |str| */
 370     X509_PUBKEY_free(xpk);
 371     return ret;
 372 }
 373
 374 int ossl_prov_write_pub_pem_from_obj(BIO *out, const void *obj, int obj_nid,
 375                                      int (*p2s)(const void *obj, int nid,
 376                                                 void **str,
 377                                                 int *strtype),
 378                                      int (*k2d)(const void *obj,
 379                                                 unsigned char **pder))
 380 {
 381     int ret = 0;
 382     void *str = NULL;
 383     int strtype = V_ASN1_UNDEF;
 384     X509_PUBKEY *xpk = NULL;
 385
 386     if (p2s != NULL && !p2s(obj, obj_nid, &str, &strtype))
 387         return 0;
 388
 389     xpk = ossl_prov_pubkey_from_obj(obj, obj_nid, str, strtype, k2d);
 390
 391     if (xpk != NULL)
 392         ret = PEM_write_bio_X509_PUBKEY(out, xpk);
 393
 394     /* Also frees |str| */
 395     X509_PUBKEY_free(xpk);
 396     return ret;
 397 }