crypto/ess/ess_lib.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 <string.h>
  11 #include <openssl/x509v3.h>
  12 #include <openssl/err.h>
  13 #include <openssl/ess.h>
  14 #include "crypto/ess.h"
  15 #include "crypto/x509.h"
  16
  17 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed);
  18 static ESS_CERT_ID_V2 *ESS_CERT_ID_V2_new_init(const EVP_MD *hash_alg,
  19                                                X509 *cert, int issuer_needed);
  20
  21 ESS_SIGNING_CERT *ESS_SIGNING_CERT_new_init(X509 *signcert,
  22                                             STACK_OF(X509) *certs,
  23                                             int issuer_needed)
  24 {
  25     ESS_CERT_ID *cid = NULL;
  26     ESS_SIGNING_CERT *sc;
  27     int i;
  28
  29     if ((sc = ESS_SIGNING_CERT_new()) == NULL)
  30         goto err;
  31     if (sc->cert_ids == NULL
  32         && (sc->cert_ids = sk_ESS_CERT_ID_new_null()) == NULL)
  33         goto err;
  34
  35     if ((cid = ESS_CERT_ID_new_init(signcert, issuer_needed)) == NULL
  36         || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
  37         goto err;
  38     for (i = 0; i < sk_X509_num(certs); ++i) {
  39         X509 *cert = sk_X509_value(certs, i);
  40         if ((cid = ESS_CERT_ID_new_init(cert, 1)) == NULL
  41             || !sk_ESS_CERT_ID_push(sc->cert_ids, cid))
  42             goto err;
  43     }
  44
  45     return sc;
  46  err:
  47     ESS_SIGNING_CERT_free(sc);
  48     ESS_CERT_ID_free(cid);
  49     ESSerr(ESS_F_ESS_SIGNING_CERT_NEW_INIT, ERR_R_MALLOC_FAILURE);
  50     return NULL;
  51 }
  52
  53 static ESS_CERT_ID *ESS_CERT_ID_new_init(X509 *cert, int issuer_needed)
  54 {
  55     ESS_CERT_ID *cid = NULL;
  56     GENERAL_NAME *name = NULL;
  57     unsigned char cert_sha1[SHA_DIGEST_LENGTH];
  58
  59     /* Call for side-effect of computing hash and caching extensions */
  60     if (!x509v3_cache_extensions(cert))
  61         return NULL;
  62
  63     if ((cid = ESS_CERT_ID_new()) == NULL)
  64         goto err;
  65     /* TODO(3.0): fetch sha1 algorithm from providers */
  66     if (!X509_digest(cert, EVP_sha1(), cert_sha1, NULL))
  67         goto err;
  68     if (!ASN1_OCTET_STRING_set(cid->hash, cert_sha1, SHA_DIGEST_LENGTH))
  69         goto err;
  70
  71     /* Setting the issuer/serial if requested. */
  72     if (!issuer_needed)
  73         return cid;
  74
  75     if (cid->issuer_serial == NULL
  76         && (cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
  77         goto err;
  78     if ((name = GENERAL_NAME_new()) == NULL)
  79         goto err;
  80     name->type = GEN_DIRNAME;
  81     if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
  82         goto err;
  83     if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
  84         goto err;
  85     name = NULL;            /* Ownership is lost. */
  86     ASN1_INTEGER_free(cid->issuer_serial->serial);
  87     if ((cid->issuer_serial->serial =
  88           ASN1_INTEGER_dup(X509_get0_serialNumber(cert))) == NULL)
  89         goto err;
  90
  91     return cid;
  92  err:
  93     GENERAL_NAME_free(name);
  94     ESS_CERT_ID_free(cid);
  95     ESSerr(ESS_F_ESS_CERT_ID_NEW_INIT, ERR_R_MALLOC_FAILURE);
  96     return NULL;
  97 }
  98
  99 ESS_SIGNING_CERT_V2 *ESS_SIGNING_CERT_V2_new_init(const EVP_MD *hash_alg,
 100                                                   X509 *signcert,
 101                                                   STACK_OF(X509) *certs,
 102                                                   int issuer_needed)
 103 {
 104     ESS_CERT_ID_V2 *cid = NULL;
 105     ESS_SIGNING_CERT_V2 *sc;
 106     int i;
 107
 108     if ((sc = ESS_SIGNING_CERT_V2_new()) == NULL)
 109         goto err;
 110     if ((cid = ESS_CERT_ID_V2_new_init(hash_alg, signcert, issuer_needed)) == NULL)
 111         goto err;
 112     if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid))
 113         goto err;
 114     cid = NULL;
 115
 116     for (i = 0; i < sk_X509_num(certs); ++i) {
 117         X509 *cert = sk_X509_value(certs, i);
 118
 119         if ((cid = ESS_CERT_ID_V2_new_init(hash_alg, cert, 1)) == NULL)
 120             goto err;
 121         if (!sk_ESS_CERT_ID_V2_push(sc->cert_ids, cid))
 122             goto err;
 123         cid = NULL;
 124     }
 125
 126     return sc;
 127  err:
 128     ESS_SIGNING_CERT_V2_free(sc);
 129     ESS_CERT_ID_V2_free(cid);
 130     ESSerr(ESS_F_ESS_SIGNING_CERT_V2_NEW_INIT, ERR_R_MALLOC_FAILURE);
 131     return NULL;
 132 }
 133
 134 static ESS_CERT_ID_V2 *ESS_CERT_ID_V2_new_init(const EVP_MD *hash_alg,
 135                                                X509 *cert, int issuer_needed)
 136 {
 137     ESS_CERT_ID_V2 *cid;
 138     GENERAL_NAME *name = NULL;
 139     unsigned char hash[EVP_MAX_MD_SIZE];
 140     unsigned int hash_len = sizeof(hash);
 141     X509_ALGOR *alg = NULL;
 142
 143     memset(hash, 0, sizeof(hash));
 144
 145     if ((cid = ESS_CERT_ID_V2_new()) == NULL)
 146         goto err;
 147
 148     if (hash_alg != EVP_sha256()) {
 149         alg = X509_ALGOR_new();
 150         if (alg == NULL)
 151             goto err;
 152         X509_ALGOR_set_md(alg, hash_alg);
 153         if (alg->algorithm == NULL)
 154             goto err;
 155         cid->hash_alg = alg;
 156         alg = NULL;
 157     } else {
 158         cid->hash_alg = NULL;
 159     }
 160
 161     /* TODO(3.0): fetch sha1 algorithm from providers */
 162     if (!X509_digest(cert, hash_alg, hash, &hash_len))
 163         goto err;
 164
 165     if (!ASN1_OCTET_STRING_set(cid->hash, hash, hash_len))
 166         goto err;
 167
 168     if (!issuer_needed)
 169         return cid;
 170
 171     if ((cid->issuer_serial = ESS_ISSUER_SERIAL_new()) == NULL)
 172         goto err;
 173     if ((name = GENERAL_NAME_new()) == NULL)
 174         goto err;
 175     name->type = GEN_DIRNAME;
 176     if ((name->d.dirn = X509_NAME_dup(X509_get_issuer_name(cert))) == NULL)
 177         goto err;
 178     if (!sk_GENERAL_NAME_push(cid->issuer_serial->issuer, name))
 179         goto err;
 180     name = NULL;            /* Ownership is lost. */
 181     ASN1_INTEGER_free(cid->issuer_serial->serial);
 182     cid->issuer_serial->serial = ASN1_INTEGER_dup(X509_get0_serialNumber(cert));
 183     if (cid->issuer_serial->serial == NULL)
 184         goto err;
 185
 186     return cid;
 187  err:
 188     X509_ALGOR_free(alg);
 189     GENERAL_NAME_free(name);
 190     ESS_CERT_ID_V2_free(cid);
 191     ESSerr(ESS_F_ESS_CERT_ID_V2_NEW_INIT, ERR_R_MALLOC_FAILURE);
 192     return NULL;
 193 }
 194
 195 ESS_SIGNING_CERT *ESS_SIGNING_CERT_get(PKCS7_SIGNER_INFO *si)
 196 {
 197     ASN1_TYPE *attr;
 198     const unsigned char *p;
 199
 200     attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificate);
 201     if (attr == NULL)
 202         return NULL;
 203     p = attr->value.sequence->data;
 204     return d2i_ESS_SIGNING_CERT(NULL, &p, attr->value.sequence->length);
 205 }
 206
 207 ESS_SIGNING_CERT_V2 *ESS_SIGNING_CERT_V2_get(PKCS7_SIGNER_INFO *si)
 208 {
 209     ASN1_TYPE *attr;
 210     const unsigned char *p;
 211
 212     attr = PKCS7_get_signed_attribute(si, NID_id_smime_aa_signingCertificateV2);
 213     if (attr == NULL)
 214         return NULL;
 215     p = attr->value.sequence->data;
 216     return d2i_ESS_SIGNING_CERT_V2(NULL, &p, attr->value.sequence->length);
 217 }
 218
 219 int ESS_SIGNING_CERT_add(PKCS7_SIGNER_INFO *si, ESS_SIGNING_CERT *sc)
 220 {
 221     ASN1_STRING *seq = NULL;
 222     unsigned char *p, *pp = NULL;
 223     int len;
 224
 225     len = i2d_ESS_SIGNING_CERT(sc, NULL);
 226     if ((pp = OPENSSL_malloc(len)) == NULL) {
 227         ESSerr(ESS_F_ESS_SIGNING_CERT_ADD, ERR_R_MALLOC_FAILURE);
 228         goto err;
 229     }
 230     p = pp;
 231     i2d_ESS_SIGNING_CERT(sc, &p);
 232     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 233         ESSerr(ESS_F_ESS_SIGNING_CERT_ADD, ERR_R_MALLOC_FAILURE);
 234         goto err;
 235     }
 236     OPENSSL_free(pp);
 237     pp = NULL;
 238     return PKCS7_add_signed_attribute(si,
 239                                       NID_id_smime_aa_signingCertificate,
 240                                       V_ASN1_SEQUENCE, seq);
 241  err:
 242     ASN1_STRING_free(seq);
 243     OPENSSL_free(pp);
 244
 245     return 0;
 246 }
 247
 248 int ESS_SIGNING_CERT_V2_add(PKCS7_SIGNER_INFO *si,
 249                             ESS_SIGNING_CERT_V2 *sc)
 250 {
 251     ASN1_STRING *seq = NULL;
 252     unsigned char *p, *pp = NULL;
 253     int len = i2d_ESS_SIGNING_CERT_V2(sc, NULL);
 254
 255     if ((pp = OPENSSL_malloc(len)) == NULL) {
 256         ESSerr(ESS_F_ESS_SIGNING_CERT_V2_ADD, ERR_R_MALLOC_FAILURE);
 257         goto err;
 258     }
 259
 260     p = pp;
 261     i2d_ESS_SIGNING_CERT_V2(sc, &p);
 262     if ((seq = ASN1_STRING_new()) == NULL || !ASN1_STRING_set(seq, pp, len)) {
 263         ESSerr(ESS_F_ESS_SIGNING_CERT_V2_ADD, ERR_R_MALLOC_FAILURE);
 264         goto err;
 265     }
 266
 267     OPENSSL_free(pp);
 268     pp = NULL;
 269     return PKCS7_add_signed_attribute(si,
 270                                       NID_id_smime_aa_signingCertificateV2,
 271                                       V_ASN1_SEQUENCE, seq);
 272  err:
 273     ASN1_STRING_free(seq);
 274     OPENSSL_free(pp);
 275     return 0;
 276 }
 277
 278 static int ess_issuer_serial_cmp(const ESS_ISSUER_SERIAL *is, const X509 *cert)
 279 {
 280     GENERAL_NAME *issuer;
 281
 282     if (is == NULL || cert == NULL || sk_GENERAL_NAME_num(is->issuer) != 1)
 283         return -1;
 284
 285     issuer = sk_GENERAL_NAME_value(is->issuer, 0);
 286     if (issuer->type != GEN_DIRNAME
 287         || X509_NAME_cmp(issuer->d.dirn, X509_get_issuer_name(cert)) != 0)
 288         return -1;
 289
 290     return ASN1_INTEGER_cmp(is->serial, X509_get0_serialNumber(cert));
 291 }
 292
 293 /* Returns < 0 if certificate is not found, certificate index otherwise. */
 294 int ess_find_cert(const STACK_OF(ESS_CERT_ID) *cert_ids, X509 *cert)
 295 {
 296     int i;
 297     unsigned char cert_sha1[SHA_DIGEST_LENGTH];
 298
 299     if (cert_ids == NULL || cert == NULL)
 300         return -1;
 301
 302     /* Recompute SHA1 hash of certificate if necessary (side effect). */
 303     if (!x509v3_cache_extensions(cert))
 304         return -1;
 305
 306     /* TODO(3.0): fetch sha1 algorithm from providers */
 307     if (!X509_digest(cert, EVP_sha1(), cert_sha1, NULL))
 308         return -1;
 309
 310     /* Look for cert in the cert_ids vector. */
 311     for (i = 0; i < sk_ESS_CERT_ID_num(cert_ids); ++i) {
 312         const ESS_CERT_ID *cid = sk_ESS_CERT_ID_value(cert_ids, i);
 313
 314         if (cid->hash->length == SHA_DIGEST_LENGTH
 315             && memcmp(cid->hash->data, cert_sha1, SHA_DIGEST_LENGTH) == 0) {
 316             const ESS_ISSUER_SERIAL *is = cid->issuer_serial;
 317
 318             if (is == NULL || ess_issuer_serial_cmp(is, cert) == 0)
 319                 return i;
 320         }
 321     }
 322
 323     return -1;
 324 }
 325
 326 /* Returns < 0 if certificate is not found, certificate index otherwise. */
 327 int ess_find_cert_v2(const STACK_OF(ESS_CERT_ID_V2) *cert_ids, const X509 *cert)
 328 {
 329     int i;
 330     unsigned char cert_digest[EVP_MAX_MD_SIZE];
 331     unsigned int len;
 332
 333     /* Look for cert in the cert_ids vector. */
 334     for (i = 0; i < sk_ESS_CERT_ID_V2_num(cert_ids); ++i) {
 335         const ESS_CERT_ID_V2 *cid = sk_ESS_CERT_ID_V2_value(cert_ids, i);
 336         const EVP_MD *md;
 337
 338         if (cid == NULL)
 339             return -1;
 340         if (cid->hash_alg != NULL)
 341             md = EVP_get_digestbyobj(cid->hash_alg->algorithm);
 342         else
 343             md = EVP_sha256();
 344
 345         /* TODO(3.0): fetch sha1 algorithm from providers */
 346         if (!X509_digest(cert, md, cert_digest, &len))
 347             return -1;
 348
 349         if (cid->hash->length != (int)len)
 350             return -1;
 351
 352         if (memcmp(cid->hash->data, cert_digest, cid->hash->length) == 0) {
 353             const ESS_ISSUER_SERIAL *is = cid->issuer_serial;
 354
 355             if (is == NULL || ess_issuer_serial_cmp(is, cert) == 0)
 356                 return i;
 357         }
 358     }
 359
 360     return -1;
 361 }