crypto/crmf/crmf_lib.c

   1 /*-
   2  * Copyright 2007-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright Nokia 2007-2018
   4  * Copyright Siemens AG 2015-2019
   5  *
   6  * Licensed under the Apache License 2.0 (the "License").  You may not use
   7  * this file except in compliance with the License.  You can obtain a copy
   8  * in the file LICENSE in the source distribution or at
   9  * https://www.openssl.org/source/license.html
  10  *
  11  * CRMF implementation by Martin Peylo, Miikka Viljanen, and David von Oheimb.
  12  */
  13
  14 /*
  15  * This file contains the functions that handle the individual items inside
  16  * the CRMF structures
  17  */
  18
  19 /*
  20  * NAMING
  21  *
  22  * The 0 functions use the supplied structure pointer directly in the parent and
  23  * it will be freed up when the parent is freed.
  24  *
  25  * The 1 functions use a copy of the supplied structure pointer (or in some
  26  * cases increases its link count) in the parent and so both should be freed up.
  27  */
  28
  29 #include <openssl/asn1t.h>
  30
  31 #include "crmf_local.h"
  32 #include "internal/constant_time.h"
  33 #include "internal/sizes.h"
  34
  35 /* explicit #includes not strictly needed since implied by the above: */
  36 #include <openssl/crmf.h>
  37 #include <openssl/err.h>
  38 #include <openssl/evp.h>
  39
  40 /*-
  41  * atyp = Attribute Type
  42  * valt = Value Type
  43  * ctrlinf = "regCtrl" or "regInfo"
  44  */
  45 #define IMPLEMENT_CRMF_CTRL_FUNC(atyp, valt, ctrlinf)                     \
  46 int OSSL_CRMF_MSG_set1_##ctrlinf##_##atyp(OSSL_CRMF_MSG *msg,             \
  47                                           const valt *in)                 \
  48 {                                                                         \
  49     OSSL_CRMF_ATTRIBUTETYPEANDVALUE *atav = NULL;                         \
  50                                                                           \
  51     if (msg == NULL || in == NULL)                                       \
  52         goto err;                                                         \
  53     if ((atav = OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new()) == NULL)           \
  54         goto err;                                                         \
  55     if ((atav->type = OBJ_nid2obj(NID_id_##ctrlinf##_##atyp)) == NULL)    \
  56         goto err;                                                         \
  57     if ((atav->value.atyp = valt##_dup(in)) == NULL)                      \
  58         goto err;                                                         \
  59     if (!OSSL_CRMF_MSG_push0_##ctrlinf(msg, atav))                        \
  60         goto err;                                                         \
  61     return 1;                                                             \
  62  err:                                                                     \
  63     OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(atav);                           \
  64     return 0;                                                             \
  65 }
  66
  67
  68 /*-
  69  * Pushes the given control attribute into the controls stack of a CertRequest
  70  * (section 6)
  71  * returns 1 on success, 0 on error
  72  */
  73 static int OSSL_CRMF_MSG_push0_regCtrl(OSSL_CRMF_MSG *crm,
  74                                        OSSL_CRMF_ATTRIBUTETYPEANDVALUE *ctrl)
  75 {
  76     int new = 0;
  77
  78     if (crm == NULL || crm->certReq == NULL || ctrl == NULL) {
  79         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
  80         return 0;
  81     }
  82
  83     if (crm->certReq->controls == NULL) {
  84         crm->certReq->controls = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new_null();
  85         if (crm->certReq->controls == NULL)
  86             goto err;
  87         new = 1;
  88     }
  89     if (!sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_push(crm->certReq->controls, ctrl))
  90         goto err;
  91
  92     return 1;
  93  err:
  94     if (new != 0) {
  95         sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(crm->certReq->controls);
  96         crm->certReq->controls = NULL;
  97     }
  98     return 0;
  99 }
 100
 101 /* id-regCtrl-regToken Control (section 6.1) */
 102 IMPLEMENT_CRMF_CTRL_FUNC(regToken, ASN1_STRING, regCtrl)
 103
 104 /* id-regCtrl-authenticator Control (section 6.2) */
 105 #define ASN1_UTF8STRING_dup ASN1_STRING_dup
 106 IMPLEMENT_CRMF_CTRL_FUNC(authenticator, ASN1_UTF8STRING, regCtrl)
 107
 108 int OSSL_CRMF_MSG_set0_SinglePubInfo(OSSL_CRMF_SINGLEPUBINFO *spi,
 109                                      int method, GENERAL_NAME *nm)
 110 {
 111     if (spi == NULL
 112             || method < OSSL_CRMF_PUB_METHOD_DONTCARE
 113             || method > OSSL_CRMF_PUB_METHOD_LDAP) {
 114         ERR_raise(ERR_LIB_CRMF, ERR_R_PASSED_INVALID_ARGUMENT);
 115         return 0;
 116     }
 117
 118     if (!ASN1_INTEGER_set(spi->pubMethod, method))
 119         return 0;
 120     GENERAL_NAME_free(spi->pubLocation);
 121     spi->pubLocation = nm;
 122     return 1;
 123 }
 124
 125 int
 126 OSSL_CRMF_MSG_PKIPublicationInfo_push0_SinglePubInfo(OSSL_CRMF_PKIPUBLICATIONINFO *pi,
 127                                                      OSSL_CRMF_SINGLEPUBINFO *spi)
 128 {
 129     if (pi == NULL || spi == NULL) {
 130         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 131         return 0;
 132     }
 133     if (pi->pubInfos == NULL)
 134         pi->pubInfos = sk_OSSL_CRMF_SINGLEPUBINFO_new_null();
 135     if (pi->pubInfos == NULL)
 136         return 0;
 137
 138     return sk_OSSL_CRMF_SINGLEPUBINFO_push(pi->pubInfos, spi);
 139 }
 140
 141 int OSSL_CRMF_MSG_set_PKIPublicationInfo_action(OSSL_CRMF_PKIPUBLICATIONINFO *pi,
 142                                                 int action)
 143 {
 144     if (pi == NULL
 145             || action < OSSL_CRMF_PUB_ACTION_DONTPUBLISH
 146             || action > OSSL_CRMF_PUB_ACTION_PLEASEPUBLISH) {
 147         ERR_raise(ERR_LIB_CRMF, ERR_R_PASSED_INVALID_ARGUMENT);
 148         return 0;
 149     }
 150
 151     return ASN1_INTEGER_set(pi->action, action);
 152 }
 153
 154 /* id-regCtrl-pkiPublicationInfo Control (section 6.3) */
 155 IMPLEMENT_CRMF_CTRL_FUNC(pkiPublicationInfo, OSSL_CRMF_PKIPUBLICATIONINFO,
 156                          regCtrl)
 157
 158 /* id-regCtrl-oldCertID Control (section 6.5) from the given */
 159 IMPLEMENT_CRMF_CTRL_FUNC(oldCertID, OSSL_CRMF_CERTID, regCtrl)
 160
 161 OSSL_CRMF_CERTID *OSSL_CRMF_CERTID_gen(const X509_NAME *issuer,
 162                                        const ASN1_INTEGER *serial)
 163 {
 164     OSSL_CRMF_CERTID *cid = NULL;
 165
 166     if (issuer == NULL || serial == NULL) {
 167         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 168         return NULL;
 169     }
 170
 171     if ((cid = OSSL_CRMF_CERTID_new()) == NULL)
 172         goto err;
 173
 174     if (!X509_NAME_set(&cid->issuer->d.directoryName, issuer))
 175         goto err;
 176     cid->issuer->type = GEN_DIRNAME;
 177
 178     ASN1_INTEGER_free(cid->serialNumber);
 179     if ((cid->serialNumber = ASN1_INTEGER_dup(serial)) == NULL)
 180         goto err;
 181
 182     return cid;
 183
 184  err:
 185     OSSL_CRMF_CERTID_free(cid);
 186     return NULL;
 187 }
 188
 189 /*
 190  * id-regCtrl-protocolEncrKey Control (section 6.6)
 191  */
 192 IMPLEMENT_CRMF_CTRL_FUNC(protocolEncrKey, X509_PUBKEY, regCtrl)
 193
 194 /*-
 195  * Pushes the attribute given in regInfo in to the CertReqMsg->regInfo stack.
 196  * (section 7)
 197  * returns 1 on success, 0 on error
 198  */
 199 static int OSSL_CRMF_MSG_push0_regInfo(OSSL_CRMF_MSG *crm,
 200                                        OSSL_CRMF_ATTRIBUTETYPEANDVALUE *ri)
 201 {
 202     STACK_OF(OSSL_CRMF_ATTRIBUTETYPEANDVALUE) *info = NULL;
 203
 204     if (crm == NULL || ri == NULL) {
 205         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 206         return 0;
 207     }
 208
 209     if (crm->regInfo == NULL)
 210         crm->regInfo = info = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new_null();
 211     if (crm->regInfo == NULL)
 212         goto err;
 213     if (!sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_push(crm->regInfo, ri))
 214         goto err;
 215     return 1;
 216
 217  err:
 218     if (info != NULL)
 219         crm->regInfo = NULL;
 220     sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(info);
 221     return 0;
 222 }
 223
 224 /* id-regInfo-utf8Pairs to regInfo (section 7.1) */
 225 IMPLEMENT_CRMF_CTRL_FUNC(utf8Pairs, ASN1_UTF8STRING, regInfo)
 226
 227 /* id-regInfo-certReq to regInfo (section 7.2) */
 228 IMPLEMENT_CRMF_CTRL_FUNC(certReq, OSSL_CRMF_CERTREQUEST, regInfo)
 229
 230
 231 /* retrieves the certificate template of crm */
 232 OSSL_CRMF_CERTTEMPLATE *OSSL_CRMF_MSG_get0_tmpl(const OSSL_CRMF_MSG *crm)
 233 {
 234     if (crm == NULL || crm->certReq == NULL) {
 235         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 236         return NULL;
 237     }
 238     return crm->certReq->certTemplate;
 239 }
 240
 241
 242 int OSSL_CRMF_MSG_set0_validity(OSSL_CRMF_MSG *crm,
 243                                 ASN1_TIME *notBefore, ASN1_TIME *notAfter)
 244 {
 245     OSSL_CRMF_OPTIONALVALIDITY *vld;
 246     OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
 247
 248     if (tmpl == NULL) { /* also crm == NULL implies this */
 249         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 250         return 0;
 251     }
 252
 253     if ((vld = OSSL_CRMF_OPTIONALVALIDITY_new()) == NULL)
 254         return 0;
 255     vld->notBefore = notBefore;
 256     vld->notAfter = notAfter;
 257     tmpl->validity = vld;
 258     return 1;
 259 }
 260
 261
 262 int OSSL_CRMF_MSG_set_certReqId(OSSL_CRMF_MSG *crm, int rid)
 263 {
 264     if (crm == NULL || crm->certReq == NULL || crm->certReq->certReqId == NULL) {
 265         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 266         return 0;
 267     }
 268
 269     return ASN1_INTEGER_set(crm->certReq->certReqId, rid);
 270 }
 271
 272 /* get ASN.1 encoded integer, return -1 on error */
 273 static int crmf_asn1_get_int(const ASN1_INTEGER *a)
 274 {
 275     int64_t res;
 276
 277     if (!ASN1_INTEGER_get_int64(&res, a)) {
 278         ERR_raise(ERR_LIB_CRMF, ASN1_R_INVALID_NUMBER);
 279         return -1;
 280     }
 281     if (res < INT_MIN) {
 282         ERR_raise(ERR_LIB_CRMF, ASN1_R_TOO_SMALL);
 283         return -1;
 284     }
 285     if (res > INT_MAX) {
 286         ERR_raise(ERR_LIB_CRMF, ASN1_R_TOO_LARGE);
 287         return -1;
 288     }
 289     return (int)res;
 290 }
 291
 292 int OSSL_CRMF_MSG_get_certReqId(const OSSL_CRMF_MSG *crm)
 293 {
 294     if (crm == NULL || /* not really needed: */ crm->certReq == NULL) {
 295         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 296         return -1;
 297     }
 298     return crmf_asn1_get_int(crm->certReq->certReqId);
 299 }
 300
 301
 302 int OSSL_CRMF_MSG_set0_extensions(OSSL_CRMF_MSG *crm,
 303                                   X509_EXTENSIONS *exts)
 304 {
 305     OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
 306
 307     if (tmpl == NULL) { /* also crm == NULL implies this */
 308         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 309         return 0;
 310     }
 311
 312     if (sk_X509_EXTENSION_num(exts) == 0) {
 313         sk_X509_EXTENSION_free(exts);
 314         exts = NULL; /* do not include empty extensions list */
 315     }
 316
 317     sk_X509_EXTENSION_pop_free(tmpl->extensions, X509_EXTENSION_free);
 318     tmpl->extensions = exts;
 319     return 1;
 320 }
 321
 322
 323 int OSSL_CRMF_MSG_push0_extension(OSSL_CRMF_MSG *crm,
 324                                   X509_EXTENSION *ext)
 325 {
 326     int new = 0;
 327     OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
 328
 329     if (tmpl == NULL || ext == NULL) { /* also crm == NULL implies this */
 330         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 331         return 0;
 332     }
 333
 334     if (tmpl->extensions == NULL) {
 335         if ((tmpl->extensions = sk_X509_EXTENSION_new_null()) == NULL)
 336             goto err;
 337         new = 1;
 338     }
 339
 340     if (!sk_X509_EXTENSION_push(tmpl->extensions, ext))
 341         goto err;
 342     return 1;
 343  err:
 344     if (new != 0) {
 345         sk_X509_EXTENSION_free(tmpl->extensions);
 346         tmpl->extensions = NULL;
 347     }
 348     return 0;
 349 }
 350
 351 static int create_popo_signature(OSSL_CRMF_POPOSIGNINGKEY *ps,
 352                                  const OSSL_CRMF_CERTREQUEST *cr,
 353                                  EVP_PKEY *pkey, const EVP_MD *digest,
 354                                  OSSL_LIB_CTX *libctx, const char *propq)
 355 {
 356     if (ps == NULL || cr == NULL || pkey == NULL) {
 357         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 358         return 0;
 359     }
 360     if (ps->poposkInput != NULL) {
 361         /* We do not support cases 1+2 defined in RFC 4211, section 4.1 */
 362         ERR_raise(ERR_LIB_CRMF, CRMF_R_POPOSKINPUT_NOT_SUPPORTED);
 363         return 0;
 364     }
 365
 366     return ASN1_item_sign_ex(ASN1_ITEM_rptr(OSSL_CRMF_CERTREQUEST),
 367                              ps->algorithmIdentifier, NULL, ps->signature, cr,
 368                              NULL, pkey, digest, libctx, propq);
 369 }
 370
 371
 372 int OSSL_CRMF_MSG_create_popo(int meth, OSSL_CRMF_MSG *crm,
 373                               EVP_PKEY *pkey, const EVP_MD *digest,
 374                               OSSL_LIB_CTX *libctx, const char *propq)
 375 {
 376     OSSL_CRMF_POPO *pp = NULL;
 377     ASN1_INTEGER *tag = NULL;
 378
 379     if (crm == NULL || (meth == OSSL_CRMF_POPO_SIGNATURE && pkey == NULL)) {
 380         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 381         return 0;
 382     }
 383
 384     if (meth == OSSL_CRMF_POPO_NONE)
 385         goto end;
 386     if ((pp = OSSL_CRMF_POPO_new()) == NULL)
 387         goto err;
 388     pp->type = meth;
 389
 390     switch (meth) {
 391     case OSSL_CRMF_POPO_RAVERIFIED:
 392         if ((pp->value.raVerified = ASN1_NULL_new()) == NULL)
 393             goto err;
 394         break;
 395
 396     case OSSL_CRMF_POPO_SIGNATURE:
 397         {
 398             OSSL_CRMF_POPOSIGNINGKEY *ps = OSSL_CRMF_POPOSIGNINGKEY_new();
 399
 400             if (ps == NULL)
 401                 goto err;
 402             if (!create_popo_signature(ps, crm->certReq, pkey, digest,
 403                                        libctx, propq)) {
 404                 OSSL_CRMF_POPOSIGNINGKEY_free(ps);
 405                 goto err;
 406             }
 407             pp->value.signature = ps;
 408         }
 409         break;
 410
 411     case OSSL_CRMF_POPO_KEYENC:
 412         if ((pp->value.keyEncipherment = OSSL_CRMF_POPOPRIVKEY_new()) == NULL)
 413             goto err;
 414         tag = ASN1_INTEGER_new();
 415         pp->value.keyEncipherment->type =
 416             OSSL_CRMF_POPOPRIVKEY_SUBSEQUENTMESSAGE;
 417         pp->value.keyEncipherment->value.subsequentMessage = tag;
 418         if (tag == NULL
 419                 || !ASN1_INTEGER_set(tag, OSSL_CRMF_SUBSEQUENTMESSAGE_ENCRCERT))
 420             goto err;
 421         break;
 422
 423     default:
 424         ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_METHOD_FOR_CREATING_POPO);
 425         goto err;
 426     }
 427
 428  end:
 429     OSSL_CRMF_POPO_free(crm->popo);
 430     crm->popo = pp;
 431
 432     return 1;
 433  err:
 434     OSSL_CRMF_POPO_free(pp);
 435     return 0;
 436 }
 437
 438 /* verifies the Proof-of-Possession of the request with the given rid in reqs */
 439 int OSSL_CRMF_MSGS_verify_popo(const OSSL_CRMF_MSGS *reqs,
 440                                int rid, int acceptRAVerified,
 441                                OSSL_LIB_CTX *libctx, const char *propq)
 442 {
 443     OSSL_CRMF_MSG *req = NULL;
 444     X509_PUBKEY *pubkey = NULL;
 445     OSSL_CRMF_POPOSIGNINGKEY *sig = NULL;
 446     const ASN1_ITEM *it;
 447     void *asn;
 448
 449     if (reqs == NULL || (req = sk_OSSL_CRMF_MSG_value(reqs, rid)) == NULL) {
 450         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 451         return 0;
 452     }
 453
 454     if (req->popo == NULL) {
 455         ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING);
 456         return 0;
 457     }
 458
 459     switch (req->popo->type) {
 460     case OSSL_CRMF_POPO_RAVERIFIED:
 461         if (!acceptRAVerified) {
 462             ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_RAVERIFIED_NOT_ACCEPTED);
 463             return 0;
 464         }
 465         break;
 466     case OSSL_CRMF_POPO_SIGNATURE:
 467         pubkey = req->certReq->certTemplate->publicKey;
 468         if (pubkey == NULL) {
 469             ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING_PUBLIC_KEY);
 470             return 0;
 471         }
 472         sig = req->popo->value.signature;
 473         if (sig->poposkInput != NULL) {
 474             /*
 475              * According to RFC 4211: publicKey contains a copy of
 476              * the public key from the certificate template. This MUST be
 477              * exactly the same value as contained in the certificate template.
 478              */
 479             if (sig->poposkInput->publicKey == NULL) {
 480                 ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING_PUBLIC_KEY);
 481                 return 0;
 482             }
 483             if (X509_PUBKEY_eq(pubkey, sig->poposkInput->publicKey) != 1) {
 484                 ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_INCONSISTENT_PUBLIC_KEY);
 485                 return 0;
 486             }
 487             it = ASN1_ITEM_rptr(OSSL_CRMF_POPOSIGNINGKEYINPUT);
 488             asn = sig->poposkInput;
 489         } else {
 490             if (req->certReq->certTemplate->subject == NULL) {
 491                 ERR_raise(ERR_LIB_CRMF, CRMF_R_POPO_MISSING_SUBJECT);
 492                 return 0;
 493             }
 494             it = ASN1_ITEM_rptr(OSSL_CRMF_CERTREQUEST);
 495             asn = req->certReq;
 496         }
 497         if (ASN1_item_verify_ex(it, sig->algorithmIdentifier, sig->signature,
 498                                 asn, NULL, X509_PUBKEY_get0(pubkey), libctx,
 499                                 propq) < 1)
 500             return 0;
 501         break;
 502     case OSSL_CRMF_POPO_KEYENC:
 503     case OSSL_CRMF_POPO_KEYAGREE:
 504     default:
 505         ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_POPO_METHOD);
 506         return 0;
 507     }
 508     return 1;
 509 }
 510
 511 /* retrieves the serialNumber of the given cert template or NULL on error */
 512 ASN1_INTEGER
 513 *OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(const OSSL_CRMF_CERTTEMPLATE *tmpl)
 514 {
 515     return tmpl != NULL ? tmpl->serialNumber : NULL;
 516 }
 517
 518 /* retrieves the issuer name of the given cert template or NULL on error */
 519 const X509_NAME
 520     *OSSL_CRMF_CERTTEMPLATE_get0_issuer(const OSSL_CRMF_CERTTEMPLATE *tmpl)
 521 {
 522     return tmpl != NULL ? tmpl->issuer : NULL;
 523 }
 524
 525 /* retrieves the issuer name of the given CertId or NULL on error */
 526 const X509_NAME *OSSL_CRMF_CERTID_get0_issuer(const OSSL_CRMF_CERTID *cid)
 527 {
 528     return cid != NULL && cid->issuer->type == GEN_DIRNAME ?
 529         cid->issuer->d.directoryName : NULL;
 530 }
 531
 532 /* retrieves the serialNumber of the given CertId or NULL on error */
 533 ASN1_INTEGER *OSSL_CRMF_CERTID_get0_serialNumber(const OSSL_CRMF_CERTID *cid)
 534 {
 535     return cid != NULL ? cid->serialNumber : NULL;
 536 }
 537
 538 /*-
 539  * fill in certificate template.
 540  * Any value argument that is NULL will leave the respective field unchanged.
 541  */
 542 int OSSL_CRMF_CERTTEMPLATE_fill(OSSL_CRMF_CERTTEMPLATE *tmpl,
 543                                 EVP_PKEY *pubkey,
 544                                 const X509_NAME *subject,
 545                                 const X509_NAME *issuer,
 546                                 const ASN1_INTEGER *serial)
 547 {
 548     if (tmpl == NULL) {
 549         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 550         return 0;
 551     }
 552     if (subject != NULL && !X509_NAME_set((X509_NAME **)&tmpl->subject, subject))
 553         return 0;
 554     if (issuer != NULL && !X509_NAME_set((X509_NAME **)&tmpl->issuer, issuer))
 555         return 0;
 556     if (serial != NULL) {
 557         ASN1_INTEGER_free(tmpl->serialNumber);
 558         if ((tmpl->serialNumber = ASN1_INTEGER_dup(serial)) == NULL)
 559             return 0;
 560     }
 561     if (pubkey != NULL && !X509_PUBKEY_set(&tmpl->publicKey, pubkey))
 562         return 0;
 563     return 1;
 564 }
 565
 566
 567 /*-
 568  * Decrypts the certificate in the given encryptedValue using private key pkey.
 569  * This is needed for the indirect PoP method as in RFC 4210 section 5.2.8.2.
 570  *
 571  * returns a pointer to the decrypted certificate
 572  * returns NULL on error or if no certificate available
 573  */
 574 X509
 575 *OSSL_CRMF_ENCRYPTEDVALUE_get1_encCert(const OSSL_CRMF_ENCRYPTEDVALUE *ecert,
 576                                        OSSL_LIB_CTX *libctx, const char *propq,
 577                                        EVP_PKEY *pkey)
 578 {
 579     X509 *cert = NULL; /* decrypted certificate */
 580     EVP_CIPHER_CTX *evp_ctx = NULL; /* context for symmetric encryption */
 581     unsigned char *ek = NULL; /* decrypted symmetric encryption key */
 582     size_t eksize = 0; /* size of decrypted symmetric encryption key */
 583     EVP_CIPHER *cipher = NULL; /* used cipher */
 584     int cikeysize = 0; /* key size from cipher */
 585     unsigned char *iv = NULL; /* initial vector for symmetric encryption */
 586     unsigned char *outbuf = NULL; /* decryption output buffer */
 587     const unsigned char *p = NULL; /* needed for decoding ASN1 */
 588     int n, outlen = 0;
 589     EVP_PKEY_CTX *pkctx = NULL; /* private key context */
 590     char name[OSSL_MAX_NAME_SIZE];
 591
 592     if (ecert == NULL || ecert->symmAlg == NULL || ecert->encSymmKey == NULL
 593             || ecert->encValue == NULL || pkey == NULL) {
 594         ERR_raise(ERR_LIB_CRMF, CRMF_R_NULL_ARGUMENT);
 595         return NULL;
 596     }
 597
 598     /* select symmetric cipher based on algorithm given in message */
 599     OBJ_obj2txt(name, sizeof(name), ecert->symmAlg->algorithm, 0);
 600
 601     (void)ERR_set_mark();
 602     cipher = EVP_CIPHER_fetch(NULL, name, NULL);
 603
 604     if (cipher == NULL)
 605         cipher = (EVP_CIPHER *)EVP_get_cipherbyname(name);
 606
 607     if (cipher == NULL) {
 608         (void)ERR_clear_last_mark();
 609         ERR_raise(ERR_LIB_CRMF, CRMF_R_UNSUPPORTED_CIPHER);
 610         goto end;
 611     }
 612     (void)ERR_pop_to_mark();
 613
 614     cikeysize = EVP_CIPHER_get_key_length(cipher);
 615     /* first the symmetric key needs to be decrypted */
 616     pkctx = EVP_PKEY_CTX_new_from_pkey(libctx, pkey, propq);
 617     if (pkctx != NULL && EVP_PKEY_decrypt_init(pkctx)) {
 618         ASN1_BIT_STRING *encKey = ecert->encSymmKey;
 619         size_t failure;
 620         int retval;
 621
 622         if (EVP_PKEY_decrypt(pkctx, NULL, &eksize,
 623                              encKey->data, encKey->length) <= 0
 624                 || (ek = OPENSSL_malloc(eksize)) == NULL)
 625             goto end;
 626         retval = EVP_PKEY_decrypt(pkctx, ek, &eksize,
 627                                   encKey->data, encKey->length);
 628         ERR_clear_error(); /* error state may have sensitive information */
 629         failure = ~constant_time_is_zero_s(constant_time_msb(retval)
 630                                            | constant_time_is_zero(retval));
 631         failure |= ~constant_time_eq_s(eksize, (size_t)cikeysize);
 632         if (failure) {
 633             ERR_raise(ERR_LIB_CRMF, CRMF_R_ERROR_DECRYPTING_SYMMETRIC_KEY);
 634             goto end;
 635         }
 636     } else {
 637         goto end;
 638     }
 639     if ((iv = OPENSSL_malloc(EVP_CIPHER_get_iv_length(cipher))) == NULL)
 640         goto end;
 641     if (ASN1_TYPE_get_octetstring(ecert->symmAlg->parameter, iv,
 642                                   EVP_CIPHER_get_iv_length(cipher))
 643         != EVP_CIPHER_get_iv_length(cipher)) {
 644         ERR_raise(ERR_LIB_CRMF, CRMF_R_MALFORMED_IV);
 645         goto end;
 646     }
 647
 648     /*
 649      * d2i_X509 changes the given pointer, so use p for decoding the message and
 650      * keep the original pointer in outbuf so the memory can be freed later
 651      */
 652     if ((p = outbuf = OPENSSL_malloc(ecert->encValue->length +
 653                                      EVP_CIPHER_get_block_size(cipher))) == NULL
 654             || (evp_ctx = EVP_CIPHER_CTX_new()) == NULL)
 655         goto end;
 656     EVP_CIPHER_CTX_set_padding(evp_ctx, 0);
 657
 658     if (!EVP_DecryptInit(evp_ctx, cipher, ek, iv)
 659             || !EVP_DecryptUpdate(evp_ctx, outbuf, &outlen,
 660                                   ecert->encValue->data,
 661                                   ecert->encValue->length)
 662             || !EVP_DecryptFinal(evp_ctx, outbuf + outlen, &n)) {
 663         ERR_raise(ERR_LIB_CRMF, CRMF_R_ERROR_DECRYPTING_CERTIFICATE);
 664         goto end;
 665     }
 666     outlen += n;
 667
 668     /* convert decrypted certificate from DER to internal ASN.1 structure */
 669     if ((cert = X509_new_ex(libctx, propq)) == NULL)
 670         goto end;
 671     if (d2i_X509(&cert, &p, outlen) == NULL)
 672         ERR_raise(ERR_LIB_CRMF, CRMF_R_ERROR_DECODING_CERTIFICATE);
 673  end:
 674     EVP_PKEY_CTX_free(pkctx);
 675     OPENSSL_free(outbuf);
 676     EVP_CIPHER_CTX_free(evp_ctx);
 677     EVP_CIPHER_free(cipher);
 678     OPENSSL_clear_free(ek, eksize);
 679     OPENSSL_free(iv);
 680     return cert;
 681 }