crypto/crmf/crmf_lib.c

   1 /*-
   2  * Copyright 2007-2019 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_int.h"
  32
  33 /* explicit #includes not strictly needed since implied by the above: */
  34 #include <openssl/crmf.h>
  35 #include <openssl/err.h>
  36 #include <openssl/evp.h>
  37
  38 /*-
  39  * atyp = Attribute Type
  40  * valt = Value Type
  41  * ctrlinf = "regCtrl" or "regInfo"
  42  */
  43 #define IMPLEMENT_CRMF_CTRL_FUNC(atyp, valt, ctrlinf)                     \
  44 int OSSL_CRMF_MSG_set1_##ctrlinf##_##atyp(OSSL_CRMF_MSG *msg,             \
  45                                           const valt *in)                 \
  46 {                                                                         \
  47     OSSL_CRMF_ATTRIBUTETYPEANDVALUE *atav = NULL;                         \
  48                                                                           \
  49     if (msg == NULL || in  == NULL)                                       \
  50         goto err;                                                         \
  51     if ((atav = OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new()) == NULL)           \
  52         goto err;                                                         \
  53     if ((atav->type = OBJ_nid2obj(NID_id_##ctrlinf##_##atyp)) == NULL)    \
  54         goto err;                                                         \
  55     if ((atav->value.atyp = valt##_dup(in)) == NULL)                      \
  56         goto err;                                                         \
  57     if (!OSSL_CRMF_MSG_push0_##ctrlinf(msg, atav))                        \
  58         goto err;                                                         \
  59     return 1;                                                             \
  60  err:                                                                     \
  61     OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(atav);                           \
  62     return 0;                                                             \
  63 }
  64
  65
  66 /*-
  67  * Pushes the given control attribute into the controls stack of a CertRequest
  68  * (section 6)
  69  * returns 1 on success, 0 on error
  70  */
  71 static int OSSL_CRMF_MSG_push0_regCtrl(OSSL_CRMF_MSG *crm,
  72                                        OSSL_CRMF_ATTRIBUTETYPEANDVALUE *ctrl)
  73 {
  74     int new = 0;
  75
  76     if (crm == NULL || crm->certReq == NULL || ctrl == NULL) {
  77         CRMFerr(CRMF_F_OSSL_CRMF_MSG_PUSH0_REGCTRL, CRMF_R_NULL_ARGUMENT);
  78         return 0;
  79     }
  80
  81     if (crm->certReq->controls == NULL) {
  82         crm->certReq->controls = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new_null();
  83         if (crm->certReq->controls == NULL)
  84             goto oom;
  85         new = 1;
  86     }
  87     if (!sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_push(crm->certReq->controls, ctrl))
  88         goto oom;
  89
  90     return 1;
  91  oom:
  92     CRMFerr(CRMF_F_OSSL_CRMF_MSG_PUSH0_REGCTRL, ERR_R_MALLOC_FAILURE);
  93
  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         CRMFerr(CRMF_F_OSSL_CRMF_MSG_SET0_SINGLEPUBINFO,
 115                 ERR_R_PASSED_INVALID_ARGUMENT);
 116         return 0;
 117     }
 118
 119     if (!ASN1_INTEGER_set(spi->pubMethod, method))
 120         return 0;
 121     GENERAL_NAME_free(spi->pubLocation);
 122     spi->pubLocation = nm;
 123     return 1;
 124 }
 125
 126 int OSSL_CRMF_MSG_PKIPublicationInfo_push0_SinglePubInfo(
 127                                  OSSL_CRMF_PKIPUBLICATIONINFO *pi,
 128                                  OSSL_CRMF_SINGLEPUBINFO *spi)
 129 {
 130     if (pi == NULL || spi == NULL) {
 131         CRMFerr(CRMF_F_OSSL_CRMF_MSG_PKIPUBLICATIONINFO_PUSH0_SINGLEPUBINFO,
 132                 CRMF_R_NULL_ARGUMENT);
 133         return 0;
 134     }
 135     if (pi->pubInfos == NULL)
 136         pi->pubInfos = sk_OSSL_CRMF_SINGLEPUBINFO_new_null();
 137     if (pi->pubInfos == NULL)
 138         goto oom;
 139
 140     if (!sk_OSSL_CRMF_SINGLEPUBINFO_push(pi->pubInfos, spi))
 141         goto oom;
 142     return 1;
 143
 144  oom:
 145     CRMFerr(CRMF_F_OSSL_CRMF_MSG_PKIPUBLICATIONINFO_PUSH0_SINGLEPUBINFO,
 146             ERR_R_MALLOC_FAILURE);
 147     return 0;
 148 }
 149
 150 int OSSL_CRMF_MSG_set_PKIPublicationInfo_action(
 151                                  OSSL_CRMF_PKIPUBLICATIONINFO *pi, int action)
 152 {
 153     if (pi == NULL
 154             || action < OSSL_CRMF_PUB_ACTION_DONTPUBLISH
 155             || action > OSSL_CRMF_PUB_ACTION_PLEASEPUBLISH) {
 156         CRMFerr(CRMF_F_OSSL_CRMF_MSG_SET_PKIPUBLICATIONINFO_ACTION,
 157                 ERR_R_PASSED_INVALID_ARGUMENT);
 158         return 0;
 159     }
 160
 161     return ASN1_INTEGER_set(pi->action, action);
 162 }
 163
 164  /* id-regCtrl-pkiPublicationInfo Control (section 6.3) */
 165 IMPLEMENT_CRMF_CTRL_FUNC(pkiPublicationInfo, OSSL_CRMF_PKIPUBLICATIONINFO,
 166                          regCtrl)
 167
 168  /* id-regCtrl-oldCertID Control (section 6.5) from the given */
 169 IMPLEMENT_CRMF_CTRL_FUNC(oldCertID, OSSL_CRMF_CERTID, regCtrl)
 170
 171 OSSL_CRMF_CERTID *OSSL_CRMF_CERTID_gen(const X509_NAME *issuer,
 172                                        const ASN1_INTEGER *serial)
 173 {
 174     OSSL_CRMF_CERTID *cid = NULL;
 175
 176     if (issuer == NULL || serial == NULL) {
 177         CRMFerr(CRMF_F_OSSL_CRMF_CERTID_GEN, CRMF_R_NULL_ARGUMENT);
 178         return NULL;
 179     }
 180
 181     if ((cid = OSSL_CRMF_CERTID_new()) == NULL)
 182         goto oom;
 183
 184     if (!X509_NAME_set(&cid->issuer->d.directoryName, issuer))
 185         goto oom;
 186     cid->issuer->type = GEN_DIRNAME;
 187
 188     ASN1_INTEGER_free(cid->serialNumber);
 189     if ((cid->serialNumber = ASN1_INTEGER_dup(serial)) == NULL)
 190         goto oom;
 191
 192     return cid;
 193
 194  oom:
 195     CRMFerr(CRMF_F_OSSL_CRMF_CERTID_GEN, ERR_R_MALLOC_FAILURE);
 196     OSSL_CRMF_CERTID_free(cid);
 197     return NULL;
 198 }
 199
 200  /*
 201   * id-regCtrl-protocolEncrKey Control (section 6.6)
 202   *
 203   * For some reason X509_PUBKEY_dup() is not implemented in OpenSSL X509
 204   * TODO: check whether that should go elsewhere
 205   */
 206 static IMPLEMENT_ASN1_DUP_FUNCTION(X509_PUBKEY)
 207 IMPLEMENT_CRMF_CTRL_FUNC(protocolEncrKey, X509_PUBKEY, regCtrl)
 208
 209 /*-
 210  * Pushes the attribute given in regInfo in to the CertReqMsg->regInfo stack.
 211  * (section 7)
 212  * returns 1 on success, 0 on error
 213  */
 214 static int OSSL_CRMF_MSG_push0_regInfo(OSSL_CRMF_MSG *crm,
 215                                        OSSL_CRMF_ATTRIBUTETYPEANDVALUE *ri)
 216 {
 217     STACK_OF(OSSL_CRMF_ATTRIBUTETYPEANDVALUE) *info = NULL;
 218
 219     if (crm == NULL || ri == NULL) {
 220         CRMFerr(CRMF_F_OSSL_CRMF_MSG_PUSH0_REGINFO, CRMF_R_NULL_ARGUMENT);
 221         return 0;
 222     }
 223
 224     if (crm->regInfo == NULL)
 225         crm->regInfo = info = sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_new_null();
 226     if (crm->regInfo == NULL)
 227         goto oom;
 228     if (!sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_push(crm->regInfo, ri))
 229         goto oom;
 230     return 1;
 231
 232  oom:
 233     CRMFerr(CRMF_F_OSSL_CRMF_MSG_PUSH0_REGINFO, ERR_R_MALLOC_FAILURE);
 234     if (info != NULL)
 235         crm->regInfo = NULL;
 236     sk_OSSL_CRMF_ATTRIBUTETYPEANDVALUE_free(info);
 237     return 0;
 238 }
 239
 240 /* id-regInfo-utf8Pairs to regInfo (section 7.1) */
 241 IMPLEMENT_CRMF_CTRL_FUNC(utf8Pairs, ASN1_UTF8STRING, regInfo)
 242
 243 /* id-regInfo-certReq to regInfo (section 7.2) */
 244 IMPLEMENT_CRMF_CTRL_FUNC(certReq, OSSL_CRMF_CERTREQUEST, regInfo)
 245
 246
 247 /* retrieves the certificate template of crm */
 248 OSSL_CRMF_CERTTEMPLATE *OSSL_CRMF_MSG_get0_tmpl(const OSSL_CRMF_MSG *crm)
 249 {
 250     if (crm == NULL || crm->certReq == NULL) {
 251         CRMFerr(CRMF_F_OSSL_CRMF_MSG_GET0_TMPL, CRMF_R_NULL_ARGUMENT);
 252         return NULL;
 253     }
 254     return crm->certReq->certTemplate;
 255 }
 256
 257
 258 int OSSL_CRMF_MSG_set_validity(OSSL_CRMF_MSG *crm, time_t from, time_t to)
 259 {
 260     OSSL_CRMF_OPTIONALVALIDITY *vld = NULL;
 261     ASN1_TIME *from_asn = NULL;
 262     ASN1_TIME *to_asn = NULL;
 263     OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
 264
 265     if (tmpl == NULL) { /* also crm == NULL implies this */
 266         CRMFerr(CRMF_F_OSSL_CRMF_MSG_SET_VALIDITY, CRMF_R_NULL_ARGUMENT);
 267         return 0;
 268     }
 269
 270     if (from != 0 && ((from_asn = ASN1_TIME_set(NULL, from)) == NULL))
 271         goto oom;
 272     if (to != 0 && ((to_asn = ASN1_TIME_set(NULL, to)) == NULL))
 273         goto oom;
 274     if ((vld = OSSL_CRMF_OPTIONALVALIDITY_new()) == NULL)
 275         goto oom;
 276
 277     vld->notBefore = from_asn;
 278     vld->notAfter = to_asn;
 279
 280     tmpl->validity = vld;
 281
 282     return 1;
 283  oom:
 284     CRMFerr(CRMF_F_OSSL_CRMF_MSG_SET_VALIDITY, ERR_R_MALLOC_FAILURE);
 285     ASN1_TIME_free(from_asn);
 286     ASN1_TIME_free(to_asn);
 287     return 0;
 288 }
 289
 290
 291 int OSSL_CRMF_MSG_set_certReqId(OSSL_CRMF_MSG *crm, int rid)
 292 {
 293     if (crm == NULL || crm->certReq == NULL || crm->certReq->certReqId == NULL) {
 294         CRMFerr(CRMF_F_OSSL_CRMF_MSG_SET_CERTREQID, CRMF_R_NULL_ARGUMENT);
 295         return 0;
 296     }
 297
 298     return ASN1_INTEGER_set(crm->certReq->certReqId, rid);
 299 }
 300
 301 /* get ASN.1 encoded integer, return -1 on error */
 302 static int crmf_asn1_get_int(const ASN1_INTEGER *a)
 303 {
 304     int64_t res;
 305
 306     if (!ASN1_INTEGER_get_int64(&res, a)) {
 307         CRMFerr(0, ASN1_R_INVALID_NUMBER);
 308         return -1;
 309     }
 310     if (res < INT_MIN) {
 311         CRMFerr(0, ASN1_R_TOO_SMALL);
 312         return -1;
 313     }
 314     if (res > INT_MAX) {
 315         CRMFerr(0, ASN1_R_TOO_LARGE);
 316         return -1;
 317     }
 318     return (int)res;
 319 }
 320
 321 int OSSL_CRMF_MSG_get_certReqId(OSSL_CRMF_MSG *crm)
 322 {
 323     if (crm == NULL || /* not really needed: */ crm->certReq == NULL) {
 324         CRMFerr(CRMF_F_OSSL_CRMF_MSG_GET_CERTREQID, CRMF_R_NULL_ARGUMENT);
 325         return -1;
 326     }
 327     return crmf_asn1_get_int(crm->certReq->certReqId);
 328 }
 329
 330
 331 int OSSL_CRMF_MSG_set0_extensions(OSSL_CRMF_MSG *crm,
 332                                   X509_EXTENSIONS *exts)
 333 {
 334     OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
 335
 336     if (tmpl == NULL) { /* also crm == NULL implies this */
 337         CRMFerr(CRMF_F_OSSL_CRMF_MSG_SET0_EXTENSIONS, CRMF_R_NULL_ARGUMENT);
 338         return 0;
 339     }
 340
 341     if (sk_X509_EXTENSION_num(exts) == 0) {
 342         sk_X509_EXTENSION_free(exts);
 343         exts = NULL; /* do not include empty extensions list */
 344     }
 345
 346     sk_X509_EXTENSION_pop_free(tmpl->extensions, X509_EXTENSION_free);
 347     tmpl->extensions = exts;
 348     return 1;
 349 }
 350
 351
 352 int OSSL_CRMF_MSG_push0_extension(OSSL_CRMF_MSG *crm,
 353                                   const X509_EXTENSION *ext)
 354 {
 355     int new = 0;
 356     OSSL_CRMF_CERTTEMPLATE *tmpl = OSSL_CRMF_MSG_get0_tmpl(crm);
 357
 358     if (tmpl == NULL || ext == NULL) { /* also crm == NULL implies this */
 359         CRMFerr(CRMF_F_OSSL_CRMF_MSG_PUSH0_EXTENSION, CRMF_R_NULL_ARGUMENT);
 360         return 0;
 361     }
 362
 363     if (tmpl->extensions == NULL) {
 364         if ((tmpl->extensions = sk_X509_EXTENSION_new_null()) == NULL)
 365             goto oom;
 366         new = 1;
 367     }
 368
 369     if (!sk_X509_EXTENSION_push(tmpl->extensions, (X509_EXTENSION *)ext))
 370         goto oom;
 371     return 1;
 372  oom:
 373     CRMFerr(CRMF_F_OSSL_CRMF_MSG_PUSH0_EXTENSION, ERR_R_MALLOC_FAILURE);
 374
 375     if (new != 0) {
 376         sk_X509_EXTENSION_free(tmpl->extensions);
 377         tmpl->extensions = NULL;
 378     }
 379     return 0;
 380 }
 381
 382 /* TODO: support cases 1+2 (besides case 3) defined in RFC 4211, section 4.1. */
 383 static int CRMF_poposigningkey_init(OSSL_CRMF_POPOSIGNINGKEY *ps,
 384                                     OSSL_CRMF_CERTREQUEST *cr,
 385                                     EVP_PKEY *pkey, int dgst)
 386 {
 387     int len;
 388     size_t crlen;
 389     size_t siglen;
 390     unsigned char *crder = NULL, *sig = NULL;
 391     int alg_nid = 0;
 392     int md_nid = 0;
 393     const EVP_MD *alg = NULL;
 394     EVP_MD_CTX *ctx = NULL;
 395     int ret = 0;
 396
 397     if (ps == NULL || cr == NULL || pkey == NULL) {
 398         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT, CRMF_R_NULL_ARGUMENT);
 399         return 0;
 400     }
 401
 402     /* OpenSSL defaults all bit strings to be encoded as ASN.1 NamedBitList */
 403     ps->signature->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07);
 404     ps->signature->flags |= ASN1_STRING_FLAG_BITS_LEFT;
 405
 406     len = i2d_OSSL_CRMF_CERTREQUEST(cr, &crder);
 407     if (len < 0 || crder == NULL) {
 408         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT, CRMF_R_ERROR);
 409         goto err;
 410     }
 411     crlen = (size_t)len;
 412
 413     if (!OBJ_find_sigid_by_algs(&alg_nid, dgst, EVP_PKEY_id(pkey))) {
 414         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT,
 415                 CRMF_R_UNSUPPORTED_ALG_FOR_POPSIGNINGKEY);
 416         goto err;
 417     }
 418     if (!OBJ_find_sigid_algs(alg_nid, &md_nid, NULL)
 419             || (alg = EVP_get_digestbynid(md_nid)) == NULL) {
 420         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT,
 421                 CRMF_R_UNSUPPORTED_ALG_FOR_POPSIGNINGKEY);
 422         goto err;
 423     }
 424     if (!X509_ALGOR_set0(ps->algorithmIdentifier, OBJ_nid2obj(alg_nid),
 425                          V_ASN1_NULL, NULL)
 426             || (ctx = EVP_MD_CTX_new()) == NULL
 427             || EVP_DigestSignInit(ctx, NULL, alg, NULL, pkey) <= 0
 428             || EVP_DigestSignUpdate(ctx, crder, crlen) <= 0
 429             || EVP_DigestSignFinal(ctx, NULL, &siglen) <= 0) {
 430         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT, CRMF_R_ERROR);
 431         goto err;
 432     }
 433     if ((sig = OPENSSL_malloc(siglen)) == NULL) {
 434         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT, ERR_R_MALLOC_FAILURE);
 435         goto err;
 436     }
 437     if (EVP_DigestSignFinal(ctx, sig, &siglen) <= 0
 438             || !ASN1_BIT_STRING_set(ps->signature, sig, siglen)) {
 439         CRMFerr(CRMF_F_CRMF_POPOSIGNINGKEY_INIT, CRMF_R_ERROR);
 440         goto err;
 441     }
 442     ret = 1;
 443
 444  err:
 445     OPENSSL_free(crder);
 446     EVP_MD_CTX_free(ctx);
 447     OPENSSL_free(sig);
 448     return ret;
 449 }
 450
 451
 452 int OSSL_CRMF_MSG_create_popo(OSSL_CRMF_MSG *crm, EVP_PKEY *pkey,
 453                               int dgst, int ppmtd)
 454 {
 455     OSSL_CRMF_POPO *pp = NULL;
 456     ASN1_INTEGER *tag = NULL;
 457
 458     if (crm == NULL || (ppmtd == OSSL_CRMF_POPO_SIGNATURE && pkey == NULL)) {
 459         CRMFerr(CRMF_F_OSSL_CRMF_MSG_CREATE_POPO, CRMF_R_NULL_ARGUMENT);
 460         return 0;
 461     }
 462
 463     if (ppmtd == OSSL_CRMF_POPO_NONE)
 464         goto end;
 465     if ((pp = OSSL_CRMF_POPO_new()) == NULL)
 466         goto oom;
 467     pp->type = ppmtd;
 468
 469     switch (ppmtd) {
 470     case OSSL_CRMF_POPO_RAVERIFIED:
 471         if ((pp->value.raVerified = ASN1_NULL_new()) == NULL)
 472             goto oom;
 473         break;
 474
 475     case OSSL_CRMF_POPO_SIGNATURE:
 476         {
 477             OSSL_CRMF_POPOSIGNINGKEY *ps = OSSL_CRMF_POPOSIGNINGKEY_new();
 478             if (ps == NULL
 479                     || !CRMF_poposigningkey_init(ps, crm->certReq, pkey, dgst)){
 480                 OSSL_CRMF_POPOSIGNINGKEY_free(ps);
 481                 goto err;
 482             }
 483             pp->value.signature = ps;
 484         }
 485         break;
 486
 487     case OSSL_CRMF_POPO_KEYENC:
 488         if ((pp->value.keyEncipherment = OSSL_CRMF_POPOPRIVKEY_new()) == NULL)
 489             goto oom;
 490         tag = ASN1_INTEGER_new();
 491         pp->value.keyEncipherment->type =
 492             OSSL_CRMF_POPOPRIVKEY_SUBSEQUENTMESSAGE;
 493         pp->value.keyEncipherment->value.subsequentMessage = tag;
 494         if (tag == NULL
 495                 || !ASN1_INTEGER_set(tag, OSSL_CRMF_SUBSEQUENTMESSAGE_ENCRCERT))
 496             goto oom;
 497         break;
 498
 499     default:
 500         CRMFerr(CRMF_F_OSSL_CRMF_MSG_CREATE_POPO,
 501                 CRMF_R_UNSUPPORTED_METHOD_FOR_CREATING_POPO);
 502         goto err;
 503     }
 504
 505  end:
 506     OSSL_CRMF_POPO_free(crm->popo);
 507     crm->popo = pp;
 508
 509     return 1;
 510  oom:
 511     CRMFerr(CRMF_F_OSSL_CRMF_MSG_CREATE_POPO, ERR_R_MALLOC_FAILURE);
 512  err:
 513     OSSL_CRMF_POPO_free(pp);
 514     return 0;
 515 }
 516
 517 /* returns 0 for equal, -1 for a < b or error on a, 1 for a > b or error on b */
 518 static int X509_PUBKEY_cmp(X509_PUBKEY *a, X509_PUBKEY *b)
 519 {
 520     X509_ALGOR *algA = NULL, *algB = NULL;
 521     int res = 0;
 522
 523     if (a == b)
 524         return 0;
 525     if (a == NULL || !X509_PUBKEY_get0_param(NULL, NULL, NULL, &algA, a)
 526             || algA == NULL)
 527         return -1;
 528     if (b == NULL || !X509_PUBKEY_get0_param(NULL, NULL, NULL, &algB, b)
 529             || algB == NULL)
 530         return 1;
 531     if ((res = X509_ALGOR_cmp(algA, algB)) != 0)
 532         return res;
 533     return EVP_PKEY_cmp(X509_PUBKEY_get0(a), X509_PUBKEY_get0(b));
 534 }
 535
 536 /* verifies the Proof-of-Possession of the request with the given rid in reqs */
 537 int OSSL_CRMF_MSGS_verify_popo(const OSSL_CRMF_MSGS *reqs,
 538                                int rid, int acceptRAVerified)
 539 {
 540     OSSL_CRMF_MSG *req = NULL;
 541     X509_PUBKEY *pubkey = NULL;
 542     OSSL_CRMF_POPOSIGNINGKEY *sig = NULL;
 543
 544     if (reqs == NULL
 545             || (req = sk_OSSL_CRMF_MSG_value(reqs, rid)) == NULL
 546             || req->popo == NULL) {
 547         CRMFerr(CRMF_F_OSSL_CRMF_MSGS_VERIFY_POPO,
 548                 CRMF_R_NULL_ARGUMENT);
 549         return 0;
 550     }
 551
 552     switch (req->popo->type) {
 553     case OSSL_CRMF_POPO_RAVERIFIED:
 554         if (acceptRAVerified)
 555             return 1;
 556         break;
 557     case OSSL_CRMF_POPO_SIGNATURE:
 558         pubkey = req->certReq->certTemplate->publicKey;
 559         sig = req->popo->value.signature;
 560         if (sig->poposkInput != NULL) {
 561             /*
 562              * According to RFC 4211: publicKey contains a copy of
 563              * the public key from the certificate template. This MUST be
 564              * exactly the same value as contained in the certificate template.
 565              */
 566             if (pubkey == NULL
 567                     || sig->poposkInput->publicKey == NULL
 568                     || X509_PUBKEY_cmp(pubkey, sig->poposkInput->publicKey)
 569                     || ASN1_item_verify(
 570                            ASN1_ITEM_rptr(OSSL_CRMF_POPOSIGNINGKEYINPUT),
 571                            sig->algorithmIdentifier, sig->signature,
 572                            sig->poposkInput, X509_PUBKEY_get0(pubkey)) < 1)
 573                 break;
 574         } else {
 575             if (pubkey == NULL
 576                     || req->certReq->certTemplate->subject == NULL
 577                     || ASN1_item_verify(ASN1_ITEM_rptr(OSSL_CRMF_CERTREQUEST),
 578                                     sig->algorithmIdentifier, sig->signature,
 579                                     req->certReq,
 580                                     X509_PUBKEY_get0(pubkey)) < 1)
 581                 break;
 582         }
 583         return 1;
 584     case OSSL_CRMF_POPO_KEYENC:
 585         /*
 586          * TODO: when OSSL_CMP_certrep_new() supports encrypted certs,
 587          * return 1 if the type of req->popo->value.keyEncipherment
 588          * is OSSL_CRMF_POPOPRIVKEY_SUBSEQUENTMESSAGE and
 589          * its value.subsequentMessage == OSSL_CRMF_SUBSEQUENTMESSAGE_ENCRCERT
 590         */
 591     case OSSL_CRMF_POPO_KEYAGREE:
 592     default:
 593         CRMFerr(CRMF_F_OSSL_CRMF_MSGS_VERIFY_POPO,
 594                 CRMF_R_UNSUPPORTED_POPO_METHOD);
 595         return 0;
 596     }
 597     CRMFerr(CRMF_F_OSSL_CRMF_MSGS_VERIFY_POPO,
 598             CRMF_R_UNSUPPORTED_POPO_NOT_ACCEPTED);
 599     return 0;
 600 }
 601
 602 /* retrieves the serialNumber of the given cert template or NULL on error */
 603 ASN1_INTEGER *OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(OSSL_CRMF_CERTTEMPLATE *tmpl)
 604 {
 605     return tmpl != NULL ? tmpl->serialNumber : NULL;
 606 }
 607
 608 /* retrieves the issuer name of the given cert template or NULL on error */
 609 X509_NAME *OSSL_CRMF_CERTTEMPLATE_get0_issuer(OSSL_CRMF_CERTTEMPLATE *tmpl)
 610 {
 611     return tmpl != NULL ? tmpl->issuer : NULL;
 612 }
 613
 614 /*
 615  * fill in certificate template.
 616  * Any value argument that is NULL will leave the respective field unchanged.
 617  */
 618 int OSSL_CRMF_CERTTEMPLATE_fill(OSSL_CRMF_CERTTEMPLATE *tmpl,
 619                                 EVP_PKEY *pubkey,
 620                                 const X509_NAME *subject,
 621                                 const X509_NAME *issuer,
 622                                 const ASN1_INTEGER *serial)
 623 {
 624     if (tmpl == NULL) {
 625         CRMFerr(CRMF_F_OSSL_CRMF_CERTTEMPLATE_FILL, CRMF_R_NULL_ARGUMENT);
 626         return 0;
 627     }
 628     if (subject != NULL && !X509_NAME_set(&tmpl->subject, subject))
 629         goto oom;
 630     if (issuer != NULL && !X509_NAME_set(&tmpl->issuer, issuer))
 631         goto oom;
 632     if (serial != NULL) {
 633         ASN1_INTEGER_free(tmpl->serialNumber);
 634         if ((tmpl->serialNumber = ASN1_INTEGER_dup(serial)) == NULL)
 635             goto oom;
 636     }
 637     if (pubkey != NULL && !X509_PUBKEY_set(&tmpl->publicKey, pubkey))
 638         goto oom;
 639     return 1;
 640
 641  oom:
 642     CRMFerr(CRMF_F_OSSL_CRMF_CERTTEMPLATE_FILL, ERR_R_MALLOC_FAILURE);
 643     return 0;
 644 }
 645
 646
 647 /*-
 648  * Decrypts the certificate in the given encryptedValue
 649  * this is needed for the indirect PoP method as in RFC 4210 section 5.2.8.2
 650  *
 651  * returns a pointer to the decrypted certificate
 652  * returns NULL on error or if no certificate available
 653  */
 654 X509 *OSSL_CRMF_ENCRYPTEDVALUE_get1_encCert(OSSL_CRMF_ENCRYPTEDVALUE *ecert,
 655                                             EVP_PKEY *pkey)
 656 {
 657     X509 *cert = NULL; /* decrypted certificate */
 658     EVP_CIPHER_CTX *evp_ctx = NULL; /* context for symmetric encryption */
 659     unsigned char *ek = NULL; /* decrypted symmetric encryption key */
 660     const EVP_CIPHER *cipher = NULL; /* used cipher */
 661     unsigned char *iv = NULL; /* initial vector for symmetric encryption */
 662     unsigned char *outbuf = NULL; /* decryption output buffer */
 663     const unsigned char *p = NULL; /* needed for decoding ASN1 */
 664     int symmAlg = 0; /* NIDs for symmetric algorithm */
 665     int n, outlen = 0;
 666     EVP_PKEY_CTX *pkctx = NULL; /* private key context */
 667
 668     if (ecert == NULL || ecert->symmAlg == NULL || ecert->encSymmKey == NULL
 669             || ecert->encValue == NULL || pkey == NULL) {
 670         CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 671                 CRMF_R_NULL_ARGUMENT);
 672         return NULL;
 673     }
 674     if ((symmAlg = OBJ_obj2nid(ecert->symmAlg->algorithm)) == 0) {
 675         CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 676                 CRMF_R_UNSUPPORTED_CIPHER);
 677         return NULL;
 678     }
 679
 680     /* first the symmetric key needs to be decrypted */
 681     pkctx = EVP_PKEY_CTX_new(pkey, NULL);
 682     if (pkctx != NULL && EVP_PKEY_decrypt_init(pkctx)) {
 683         ASN1_BIT_STRING *encKey = ecert->encSymmKey;
 684         size_t eksize = 0;
 685
 686         if (EVP_PKEY_decrypt(pkctx, NULL, &eksize, encKey->data, encKey->length)
 687                 <= 0
 688                 || (ek = OPENSSL_malloc(eksize)) == NULL
 689                 || EVP_PKEY_decrypt(pkctx, ek, &eksize, encKey->data,
 690                                     encKey->length) <= 0) {
 691             CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 692                     CRMF_R_ERROR_DECRYPTING_SYMMETRIC_KEY);
 693             goto end;
 694         }
 695     } else {
 696         goto oom;
 697     }
 698
 699     /* select symmetric cipher based on algorithm given in message */
 700     if ((cipher = EVP_get_cipherbynid(symmAlg)) == NULL) {
 701         CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 702                 CRMF_R_UNSUPPORTED_CIPHER);
 703         goto end;
 704     }
 705     if ((iv = OPENSSL_malloc(EVP_CIPHER_iv_length(cipher))) == NULL)
 706         goto oom;
 707     if (ASN1_TYPE_get_octetstring(ecert->symmAlg->parameter, iv,
 708                                    EVP_CIPHER_iv_length(cipher))
 709         != EVP_CIPHER_iv_length(cipher)) {
 710         CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 711                 CRMF_R_MALFORMED_IV);
 712         goto end;
 713     }
 714
 715     /*
 716      * d2i_X509 changes the given pointer, so use p for decoding the message and
 717      * keep the original pointer in outbuf so the memory can be freed later
 718      */
 719     if ((p = outbuf = OPENSSL_malloc(ecert->encValue->length +
 720                                      EVP_CIPHER_block_size(cipher))) == NULL
 721             || (evp_ctx = EVP_CIPHER_CTX_new()) == NULL)
 722         goto oom;
 723     EVP_CIPHER_CTX_set_padding(evp_ctx, 0);
 724
 725     if (!EVP_DecryptInit(evp_ctx, cipher, ek, iv)
 726             || !EVP_DecryptUpdate(evp_ctx, outbuf, &outlen,
 727                                   ecert->encValue->data,
 728                                   ecert->encValue->length)
 729             || !EVP_DecryptFinal(evp_ctx, outbuf + outlen, &n)) {
 730         CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 731                 CRMF_R_ERROR_DECRYPTING_CERTIFICATE);
 732         goto end;
 733     }
 734     outlen += n;
 735
 736     /* convert decrypted certificate from DER to internal ASN.1 structure */
 737     if ((cert = d2i_X509(NULL, &p, outlen)) == NULL) {
 738         CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT,
 739                 CRMF_R_ERROR_DECODING_CERTIFICATE);
 740     }
 741     goto end;
 742
 743  oom:
 744     CRMFerr(CRMF_F_OSSL_CRMF_ENCRYPTEDVALUE_GET1_ENCCERT, ERR_R_MALLOC_FAILURE);
 745  end:
 746     EVP_PKEY_CTX_free(pkctx);
 747     OPENSSL_free(outbuf);
 748     EVP_CIPHER_CTX_free(evp_ctx);
 749     OPENSSL_free(ek);
 750     OPENSSL_free(iv);
 751     return cert;
 752 }