crypto/cmp/cmp_msg.c

   1 /*
   2  * Copyright 2007-2019 The OpenSSL Project Authors. All Rights Reserved.
   3  * Copyright Nokia 2007-2019
   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
  12 /* CMP functions for PKIMessage construction */
  13
  14 #include "cmp_local.h"
  15
  16 /* explicit #includes not strictly needed since implied by the above: */
  17 #include <openssl/asn1t.h>
  18 #include <openssl/cmp.h>
  19 #include <openssl/crmf.h>
  20 #include <openssl/err.h>
  21 #include <openssl/x509.h>
  22
  23 OSSL_CMP_PKIHEADER *OSSL_CMP_MSG_get0_header(const OSSL_CMP_MSG *msg)
  24 {
  25     if (msg == NULL) {
  26         CMPerr(0, CMP_R_NULL_ARGUMENT);
  27         return NULL;
  28     }
  29     return msg->header;
  30 }
  31
  32 const char *ossl_cmp_bodytype_to_string(int type)
  33 {
  34     static const char *type_names[] = {
  35         "IR", "IP", "CR", "CP", "P10CR",
  36         "POPDECC", "POPDECR", "KUR", "KUP",
  37         "KRR", "KRP", "RR", "RP", "CCR", "CCP",
  38         "CKUANN", "CANN", "RANN", "CRLANN", "PKICONF", "NESTED",
  39         "GENM", "GENP", "ERROR", "CERTCONF", "POLLREQ", "POLLREP",
  40     };
  41
  42     if (type < 0 || type > OSSL_CMP_PKIBODY_TYPE_MAX)
  43         return "illegal body type";
  44     return type_names[type];
  45 }
  46
  47 int ossl_cmp_msg_set_bodytype(OSSL_CMP_MSG *msg, int type)
  48 {
  49     if (!ossl_assert(msg != NULL && msg->body != NULL))
  50         return 0;
  51
  52     msg->body->type = type;
  53     return 1;
  54 }
  55
  56 int ossl_cmp_msg_get_bodytype(const OSSL_CMP_MSG *msg)
  57 {
  58     if (!ossl_assert(msg != NULL && msg->body != NULL))
  59         return -1;
  60
  61     return msg->body->type;
  62 }
  63
  64 /* Add an extension to the referenced extension stack, which may be NULL */
  65 static int add1_extension(X509_EXTENSIONS **pexts, int nid, int crit, void *ex)
  66 {
  67     X509_EXTENSION *ext;
  68     int res;
  69
  70     if (!ossl_assert(pexts != NULL)) /* pointer to var must not be NULL */
  71         return 0;
  72
  73     if ((ext = X509V3_EXT_i2d(nid, crit, ex)) == NULL)
  74         return 0;
  75
  76     res = X509v3_add_ext(pexts, ext, 0) != NULL;
  77     X509_EXTENSION_free(ext);
  78     return res;
  79 }
  80
  81 /* Add a CRL revocation reason code to extension stack, which may be NULL */
  82 static int add_crl_reason_extension(X509_EXTENSIONS **pexts, int reason_code)
  83 {
  84     ASN1_ENUMERATED *val = ASN1_ENUMERATED_new();
  85     int res = 0;
  86
  87     if (val != NULL && ASN1_ENUMERATED_set(val, reason_code))
  88         res = add1_extension(pexts, NID_crl_reason, 0 /* non-critical */, val);
  89     ASN1_ENUMERATED_free(val);
  90     return res;
  91 }
  92
  93 OSSL_CMP_MSG *ossl_cmp_msg_create(OSSL_CMP_CTX *ctx, int bodytype)
  94 {
  95     OSSL_CMP_MSG *msg = NULL;
  96
  97     if (!ossl_assert(ctx != NULL))
  98         return NULL;
  99
 100     if ((msg = OSSL_CMP_MSG_new()) == NULL)
 101         return NULL;
 102     if (!ossl_cmp_hdr_init(ctx, msg->header)
 103             || !ossl_cmp_msg_set_bodytype(msg, bodytype))
 104         goto err;
 105     if (ctx->geninfo_ITAVs != NULL
 106             && !ossl_cmp_hdr_generalInfo_push1_items(msg->header,
 107                                                      ctx->geninfo_ITAVs))
 108         goto err;
 109
 110     switch (bodytype) {
 111     case OSSL_CMP_PKIBODY_IR:
 112     case OSSL_CMP_PKIBODY_CR:
 113     case OSSL_CMP_PKIBODY_KUR:
 114         if ((msg->body->value.ir = OSSL_CRMF_MSGS_new()) == NULL)
 115             goto err;
 116         return msg;
 117
 118     case OSSL_CMP_PKIBODY_P10CR:
 119         if (ctx->p10CSR == NULL) {
 120             CMPerr(0, CMP_R_ERROR_CREATING_P10CR);
 121             goto err;
 122         }
 123         if ((msg->body->value.p10cr = X509_REQ_dup(ctx->p10CSR)) == NULL)
 124             goto err;
 125         return msg;
 126
 127     case OSSL_CMP_PKIBODY_IP:
 128     case OSSL_CMP_PKIBODY_CP:
 129     case OSSL_CMP_PKIBODY_KUP:
 130         if ((msg->body->value.ip = OSSL_CMP_CERTREPMESSAGE_new()) == NULL)
 131             goto err;
 132         return msg;
 133
 134     case OSSL_CMP_PKIBODY_RR:
 135         if ((msg->body->value.rr = sk_OSSL_CMP_REVDETAILS_new_null()) == NULL)
 136             goto err;
 137         return msg;
 138     case OSSL_CMP_PKIBODY_RP:
 139         if ((msg->body->value.rp = OSSL_CMP_REVREPCONTENT_new()) == NULL)
 140             goto err;
 141         return msg;
 142
 143     case OSSL_CMP_PKIBODY_CERTCONF:
 144         if ((msg->body->value.certConf =
 145              sk_OSSL_CMP_CERTSTATUS_new_null()) == NULL)
 146             goto err;
 147         return msg;
 148     case OSSL_CMP_PKIBODY_PKICONF:
 149         if ((msg->body->value.pkiconf = ASN1_TYPE_new()) == NULL)
 150             goto err;
 151         ASN1_TYPE_set(msg->body->value.pkiconf, V_ASN1_NULL, NULL);
 152         return msg;
 153
 154     case OSSL_CMP_PKIBODY_POLLREQ:
 155         if ((msg->body->value.pollReq = sk_OSSL_CMP_POLLREQ_new_null()) == NULL)
 156             goto err;
 157         return msg;
 158     case OSSL_CMP_PKIBODY_POLLREP:
 159         if ((msg->body->value.pollRep = sk_OSSL_CMP_POLLREP_new_null()) == NULL)
 160             goto err;
 161         return msg;
 162
 163     case OSSL_CMP_PKIBODY_GENM:
 164     case OSSL_CMP_PKIBODY_GENP:
 165         if ((msg->body->value.genm = sk_OSSL_CMP_ITAV_new_null()) == NULL)
 166             goto err;
 167         return msg;
 168
 169     case OSSL_CMP_PKIBODY_ERROR:
 170         if ((msg->body->value.error = OSSL_CMP_ERRORMSGCONTENT_new()) == NULL)
 171             goto err;
 172         return msg;
 173
 174     default:
 175         CMPerr(0, CMP_R_UNEXPECTED_PKIBODY);
 176         goto err;
 177     }
 178
 179  err:
 180     OSSL_CMP_MSG_free(msg);
 181     return NULL;
 182 }
 183
 184 #define HAS_SAN(ctx) \
 185     (sk_GENERAL_NAME_num((ctx)->subjectAltNames) > 0 \
 186          || OSSL_CMP_CTX_reqExtensions_have_SAN(ctx) == 1)
 187
 188 static X509_NAME *determine_subj(OSSL_CMP_CTX *ctx, X509 *refcert,
 189                                  int bodytype)
 190 {
 191     if (ctx->subjectName != NULL)
 192         return ctx->subjectName;
 193
 194     if (refcert != NULL
 195             && (bodytype == OSSL_CMP_PKIBODY_KUR || !HAS_SAN(ctx)))
 196         /*
 197          * For KUR, copy subjectName from reference certificate.
 198          * For IR or CR, do the same only if there is no subjectAltName.
 199          */
 200         return X509_get_subject_name(refcert);
 201     return NULL;
 202 }
 203
 204 /*
 205  * Create CRMF certificate request message for IR/CR/KUR
 206  * returns a pointer to the OSSL_CRMF_MSG on success, NULL on error
 207  */
 208 static OSSL_CRMF_MSG *crm_new(OSSL_CMP_CTX *ctx, int bodytype,
 209                               int rid, EVP_PKEY *rkey)
 210 {
 211     OSSL_CRMF_MSG *crm = NULL;
 212     X509 *refcert = ctx->oldCert != NULL ? ctx->oldCert : ctx->clCert;
 213     /* refcert defaults to current client cert */
 214     STACK_OF(GENERAL_NAME) *default_sans = NULL;
 215     X509_NAME *subject = determine_subj(ctx, refcert, bodytype);
 216     int crit = ctx->setSubjectAltNameCritical || subject == NULL;
 217     /* RFC5280: subjectAltName MUST be critical if subject is null */
 218     X509_EXTENSIONS *exts = NULL;
 219
 220     if (rkey == NULL
 221             || (bodytype == OSSL_CMP_PKIBODY_KUR && refcert == NULL)) {
 222         CMPerr(0, CMP_R_INVALID_ARGS);
 223         return NULL;
 224     }
 225     if ((crm = OSSL_CRMF_MSG_new()) == NULL)
 226         return NULL;
 227     if (!OSSL_CRMF_MSG_set_certReqId(crm, rid)
 228             /*
 229              * fill certTemplate, corresponding to CertificationRequestInfo
 230              * of PKCS#10. The rkey param cannot be NULL so far -
 231              * it could be NULL if centralized key creation was supported
 232              */
 233             || !OSSL_CRMF_CERTTEMPLATE_fill(OSSL_CRMF_MSG_get0_tmpl(crm), rkey,
 234                                             subject, ctx->issuer,
 235                                             NULL/* serial */))
 236         goto err;
 237     if (ctx->days != 0) {
 238         time_t notBefore, notAfter;
 239
 240         notBefore = time(NULL);
 241         notAfter = notBefore + 60 * 60 * 24 * ctx->days;
 242         if (!OSSL_CRMF_MSG_set_validity(crm, notBefore, notAfter))
 243             goto err;
 244     }
 245
 246     /* extensions */
 247     if (refcert != NULL && !ctx->SubjectAltName_nodefault)
 248         default_sans = X509V3_get_d2i(X509_get0_extensions(refcert),
 249                                       NID_subject_alt_name, NULL, NULL);
 250     /* exts are copied from ctx to allow reuse */
 251     if (ctx->reqExtensions != NULL) {
 252         exts = sk_X509_EXTENSION_deep_copy(ctx->reqExtensions,
 253                                            X509_EXTENSION_dup,
 254                                            X509_EXTENSION_free);
 255         if (exts == NULL)
 256             goto err;
 257     }
 258     if (sk_GENERAL_NAME_num(ctx->subjectAltNames) > 0
 259             && !add1_extension(&exts, NID_subject_alt_name,
 260                                crit, ctx->subjectAltNames))
 261         goto err;
 262     if (!HAS_SAN(ctx) && default_sans != NULL
 263             && !add1_extension(&exts, NID_subject_alt_name, crit, default_sans))
 264         goto err;
 265     if (ctx->policies != NULL
 266             && !add1_extension(&exts, NID_certificate_policies,
 267                                ctx->setPoliciesCritical, ctx->policies))
 268         goto err;
 269     if (!OSSL_CRMF_MSG_set0_extensions(crm, exts))
 270         goto err;
 271     exts = NULL;
 272     /* end fill certTemplate, now set any controls */
 273
 274     /* for KUR, set OldCertId according to D.6 */
 275     if (bodytype == OSSL_CMP_PKIBODY_KUR) {
 276         OSSL_CRMF_CERTID *cid =
 277             OSSL_CRMF_CERTID_gen(X509_get_issuer_name(refcert),
 278                                  X509_get_serialNumber(refcert));
 279         int ret;
 280
 281         if (cid == NULL)
 282             goto err;
 283         ret = OSSL_CRMF_MSG_set1_regCtrl_oldCertID(crm, cid);
 284         OSSL_CRMF_CERTID_free(cid);
 285         if (ret == 0)
 286             goto err;
 287     }
 288
 289     goto end;
 290
 291  err:
 292     OSSL_CRMF_MSG_free(crm);
 293     crm = NULL;
 294
 295  end:
 296     sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
 297     sk_GENERAL_NAME_pop_free(default_sans, GENERAL_NAME_free);
 298     return crm;
 299 }
 300
 301 OSSL_CMP_MSG *ossl_cmp_certReq_new(OSSL_CMP_CTX *ctx, int type, int err_code)
 302 {
 303     EVP_PKEY *rkey;
 304     EVP_PKEY *privkey;
 305     OSSL_CMP_MSG *msg;
 306     OSSL_CRMF_MSG *crm = NULL;
 307
 308     if (!ossl_assert(ctx != NULL))
 309         return NULL;
 310
 311     rkey = OSSL_CMP_CTX_get0_newPkey(ctx, 0);
 312     if (rkey == NULL)
 313         return NULL;
 314     privkey = OSSL_CMP_CTX_get0_newPkey(ctx, 1);
 315
 316     if (type != OSSL_CMP_PKIBODY_IR && type != OSSL_CMP_PKIBODY_CR
 317             && type != OSSL_CMP_PKIBODY_KUR && type != OSSL_CMP_PKIBODY_P10CR) {
 318         CMPerr(0, CMP_R_INVALID_ARGS);
 319         return NULL;
 320     }
 321
 322     if ((msg = ossl_cmp_msg_create(ctx, type)) == NULL)
 323         goto err;
 324
 325     /* header */
 326     if (ctx->implicitConfirm && !ossl_cmp_hdr_set_implicitConfirm(msg->header))
 327         goto err;
 328
 329     /* body */
 330     /* For P10CR the content has already been set in OSSL_CMP_MSG_create */
 331     if (type != OSSL_CMP_PKIBODY_P10CR) {
 332         if (ctx->popoMethod == OSSL_CRMF_POPO_SIGNATURE && privkey == NULL) {
 333             CMPerr(0, CMP_R_MISSING_PRIVATE_KEY);
 334             goto err;
 335         }
 336         if ((crm = crm_new(ctx, type, OSSL_CMP_CERTREQID, rkey)) == NULL
 337                 || !OSSL_CRMF_MSG_create_popo(crm, privkey, ctx->digest,
 338                                               ctx->popoMethod)
 339                 /* value.ir is same for cr and kur */
 340                 || !sk_OSSL_CRMF_MSG_push(msg->body->value.ir, crm))
 341             goto err;
 342         crm = NULL;
 343         /* TODO: here optional 2nd certreqmsg could be pushed to the stack */
 344     }
 345
 346     if (!ossl_cmp_msg_protect(ctx, msg))
 347         goto err;
 348
 349     return msg;
 350
 351  err:
 352     CMPerr(0, err_code);
 353     OSSL_CRMF_MSG_free(crm);
 354     OSSL_CMP_MSG_free(msg);
 355     return NULL;
 356 }
 357
 358 OSSL_CMP_MSG *ossl_cmp_certRep_new(OSSL_CMP_CTX *ctx, int bodytype,
 359                                    int certReqId, OSSL_CMP_PKISI *si,
 360                                    X509 *cert, STACK_OF(X509) *chain,
 361                                    STACK_OF(X509) *caPubs, int encrypted,
 362                                    int unprotectedErrors)
 363 {
 364     OSSL_CMP_MSG *msg = NULL;
 365     OSSL_CMP_CERTREPMESSAGE *repMsg = NULL;
 366     OSSL_CMP_CERTRESPONSE *resp = NULL;
 367     int status = -1;
 368
 369     if (!ossl_assert(ctx != NULL && si != NULL))
 370         return NULL;
 371
 372     if ((msg = ossl_cmp_msg_create(ctx, bodytype)) == NULL)
 373         goto err;
 374     repMsg = msg->body->value.ip; /* value.ip is same for cp and kup */
 375
 376     /* header */
 377     if (ctx->implicitConfirm && !ossl_cmp_hdr_set_implicitConfirm(msg->header))
 378         goto err;
 379
 380     /* body */
 381     if ((resp = OSSL_CMP_CERTRESPONSE_new()) == NULL)
 382         goto err;
 383     OSSL_CMP_PKISI_free(resp->status);
 384     if ((resp->status = OSSL_CMP_PKISI_dup(si)) == NULL
 385             || !ASN1_INTEGER_set(resp->certReqId, certReqId))
 386         goto err;
 387
 388     status = ossl_cmp_pkisi_get_pkistatus(resp->status);
 389     if (status != OSSL_CMP_PKISTATUS_rejection
 390             && status != OSSL_CMP_PKISTATUS_waiting && cert != NULL) {
 391         if (encrypted) {
 392             CMPerr(0, CMP_R_INVALID_ARGS);
 393             goto err;
 394         }
 395
 396         if ((resp->certifiedKeyPair = OSSL_CMP_CERTIFIEDKEYPAIR_new())
 397             == NULL)
 398             goto err;
 399         resp->certifiedKeyPair->certOrEncCert->type =
 400             OSSL_CMP_CERTORENCCERT_CERTIFICATE;
 401         if (!X509_up_ref(cert))
 402             goto err;
 403         resp->certifiedKeyPair->certOrEncCert->value.certificate = cert;
 404     }
 405
 406     if (!sk_OSSL_CMP_CERTRESPONSE_push(repMsg->response, resp))
 407         goto err;
 408     resp = NULL;
 409     /* TODO: here optional 2nd certrep could be pushed to the stack */
 410
 411     if (bodytype == OSSL_CMP_PKIBODY_IP && caPubs != NULL
 412             && (repMsg->caPubs = X509_chain_up_ref(caPubs)) == NULL)
 413         goto err;
 414     if (chain != NULL
 415             && !ossl_cmp_sk_X509_add1_certs(msg->extraCerts, chain, 0, 1, 0))
 416         goto err;
 417
 418     if (!unprotectedErrors
 419             || ossl_cmp_pkisi_get_pkistatus(si) != OSSL_CMP_PKISTATUS_rejection)
 420         if (!ossl_cmp_msg_protect(ctx, msg))
 421             goto err;
 422
 423     return msg;
 424
 425  err:
 426     CMPerr(0, CMP_R_ERROR_CREATING_CERTREP);
 427     OSSL_CMP_CERTRESPONSE_free(resp);
 428     OSSL_CMP_MSG_free(msg);
 429     return NULL;
 430 }
 431
 432 OSSL_CMP_MSG *ossl_cmp_rr_new(OSSL_CMP_CTX *ctx)
 433 {
 434     OSSL_CMP_MSG *msg = NULL;
 435     OSSL_CMP_REVDETAILS *rd;
 436
 437     if (!ossl_assert(ctx != NULL && ctx->oldCert != NULL))
 438         return NULL;
 439
 440     if ((rd = OSSL_CMP_REVDETAILS_new()) == NULL)
 441         goto err;
 442
 443     /* Fill the template from the contents of the certificate to be revoked */
 444     if (!OSSL_CRMF_CERTTEMPLATE_fill(rd->certDetails,
 445                                      NULL/* pubkey would be redundant */,
 446                                      NULL/* subject would be redundant */,
 447                                      X509_get_issuer_name(ctx->oldCert),
 448                                      X509_get_serialNumber(ctx->oldCert)))
 449         goto err;
 450
 451     /* revocation reason code is optional */
 452     if (ctx->revocationReason != CRL_REASON_NONE
 453             && !add_crl_reason_extension(&rd->crlEntryDetails,
 454                                          ctx->revocationReason))
 455         goto err;
 456
 457     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_RR)) == NULL)
 458         goto err;
 459
 460     if (!sk_OSSL_CMP_REVDETAILS_push(msg->body->value.rr, rd))
 461         goto err;
 462     rd = NULL;
 463
 464     /*
 465      * TODO: the Revocation Passphrase according to section 5.3.19.9 could be
 466      *       set here if set in ctx
 467      */
 468
 469     if (!ossl_cmp_msg_protect(ctx, msg))
 470         goto err;
 471
 472     return msg;
 473
 474  err:
 475     CMPerr(0, CMP_R_ERROR_CREATING_RR);
 476     OSSL_CMP_MSG_free(msg);
 477     OSSL_CMP_REVDETAILS_free(rd);
 478     return NULL;
 479 }
 480
 481 OSSL_CMP_MSG *ossl_cmp_rp_new(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si,
 482                               OSSL_CRMF_CERTID *cid, int unprot_err)
 483 {
 484     OSSL_CMP_REVREPCONTENT *rep = NULL;
 485     OSSL_CMP_PKISI *si1 = NULL;
 486     OSSL_CRMF_CERTID *cid_copy = NULL;
 487     OSSL_CMP_MSG *msg = NULL;
 488
 489     if (!ossl_assert(ctx != NULL && si != NULL && cid != NULL))
 490         return NULL;
 491
 492     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_RP)) == NULL)
 493         goto err;
 494     rep = msg->body->value.rp;
 495
 496     if ((si1 = OSSL_CMP_PKISI_dup(si)) == NULL)
 497         goto err;
 498
 499     if (!sk_OSSL_CMP_PKISI_push(rep->status, si1)) {
 500         OSSL_CMP_PKISI_free(si1);
 501         goto err;
 502     }
 503
 504     if ((rep->revCerts = sk_OSSL_CRMF_CERTID_new_null()) == NULL)
 505         goto err;
 506     if ((cid_copy = OSSL_CRMF_CERTID_dup(cid)) == NULL)
 507         goto err;
 508     if (!sk_OSSL_CRMF_CERTID_push(rep->revCerts, cid_copy)) {
 509         OSSL_CRMF_CERTID_free(cid_copy);
 510         goto err;
 511     }
 512
 513     if (!unprot_err
 514             || ossl_cmp_pkisi_get_pkistatus(si) != OSSL_CMP_PKISTATUS_rejection)
 515         if (!ossl_cmp_msg_protect(ctx, msg))
 516             goto err;
 517
 518     return msg;
 519
 520  err:
 521     CMPerr(0, CMP_R_ERROR_CREATING_RP);
 522     OSSL_CMP_MSG_free(msg);
 523     return NULL;
 524 }
 525
 526 OSSL_CMP_MSG *ossl_cmp_pkiconf_new(OSSL_CMP_CTX *ctx)
 527 {
 528     OSSL_CMP_MSG *msg;
 529
 530     if (!ossl_assert(ctx != NULL))
 531         return NULL;
 532
 533     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_PKICONF)) == NULL)
 534         goto err;
 535     if (ossl_cmp_msg_protect(ctx, msg))
 536         return msg;
 537
 538  err:
 539     CMPerr(0, CMP_R_ERROR_CREATING_PKICONF);
 540     OSSL_CMP_MSG_free(msg);
 541     return NULL;
 542 }
 543
 544 int ossl_cmp_msg_gen_push0_ITAV(OSSL_CMP_MSG *msg, OSSL_CMP_ITAV *itav)
 545 {
 546     int bodytype;
 547
 548     if (!ossl_assert(msg != NULL && itav != NULL))
 549         return 0;
 550
 551     bodytype = ossl_cmp_msg_get_bodytype(msg);
 552     if (bodytype != OSSL_CMP_PKIBODY_GENM
 553             && bodytype != OSSL_CMP_PKIBODY_GENP) {
 554         CMPerr(0, CMP_R_INVALID_ARGS);
 555         return 0;
 556     }
 557
 558     /* value.genp has the same structure, so this works for genp as well */
 559     return OSSL_CMP_ITAV_push0_stack_item(&msg->body->value.genm, itav);
 560 }
 561
 562 int ossl_cmp_msg_gen_push1_ITAVs(OSSL_CMP_MSG *msg,
 563                                  STACK_OF(OSSL_CMP_ITAV) *itavs)
 564 {
 565     int i;
 566     OSSL_CMP_ITAV *itav = NULL;
 567
 568     if (!ossl_assert(msg != NULL))
 569         return 0;
 570
 571     for (i = 0; i < sk_OSSL_CMP_ITAV_num(itavs); i++) {
 572         if ((itav = OSSL_CMP_ITAV_dup(sk_OSSL_CMP_ITAV_value(itavs,i))) == NULL)
 573             return 0;
 574         if (!ossl_cmp_msg_gen_push0_ITAV(msg, itav)) {
 575             OSSL_CMP_ITAV_free(itav);
 576             return 0;
 577         }
 578     }
 579     return 1;
 580 }
 581
 582 /*
 583  * Creates a new General Message/Response with an empty itav stack
 584  * returns a pointer to the PKIMessage on success, NULL on error
 585  */
 586 static OSSL_CMP_MSG *gen_new(OSSL_CMP_CTX *ctx, int body_type, int err_code)
 587 {
 588     OSSL_CMP_MSG *msg = NULL;
 589
 590     if (!ossl_assert(ctx != NULL))
 591         return NULL;
 592
 593     if ((msg = ossl_cmp_msg_create(ctx, body_type)) == NULL)
 594         return NULL;
 595
 596     if (ctx->genm_ITAVs != NULL
 597             && !ossl_cmp_msg_gen_push1_ITAVs(msg, ctx->genm_ITAVs))
 598         goto err;
 599
 600     if (!ossl_cmp_msg_protect(ctx, msg))
 601         goto err;
 602
 603     return msg;
 604
 605  err:
 606     CMPerr(0, err_code);
 607     OSSL_CMP_MSG_free(msg);
 608     return NULL;
 609 }
 610
 611 OSSL_CMP_MSG *ossl_cmp_genm_new(OSSL_CMP_CTX *ctx)
 612 {
 613     return gen_new(ctx, OSSL_CMP_PKIBODY_GENM, CMP_R_ERROR_CREATING_GENM);
 614 }
 615
 616 OSSL_CMP_MSG *ossl_cmp_genp_new(OSSL_CMP_CTX *ctx)
 617 {
 618     return gen_new(ctx, OSSL_CMP_PKIBODY_GENP, CMP_R_ERROR_CREATING_GENP);
 619 }
 620
 621 OSSL_CMP_MSG *ossl_cmp_error_new(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si,
 622                                  int errorCode,
 623                                  OSSL_CMP_PKIFREETEXT *errorDetails,
 624                                  int unprotected)
 625 {
 626     OSSL_CMP_MSG *msg = NULL;
 627
 628     if (!ossl_assert(ctx != NULL && si != NULL))
 629         return NULL;
 630
 631     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_ERROR)) == NULL)
 632         goto err;
 633
 634     OSSL_CMP_PKISI_free(msg->body->value.error->pKIStatusInfo);
 635     if ((msg->body->value.error->pKIStatusInfo = OSSL_CMP_PKISI_dup(si))
 636         == NULL)
 637         goto err;
 638     if (errorCode >= 0) {
 639         if ((msg->body->value.error->errorCode = ASN1_INTEGER_new()) == NULL)
 640             goto err;
 641         if (!ASN1_INTEGER_set(msg->body->value.error->errorCode, errorCode))
 642             goto err;
 643     }
 644     if (errorDetails != NULL)
 645         if ((msg->body->value.error->errorDetails =
 646             sk_ASN1_UTF8STRING_deep_copy(errorDetails, ASN1_STRING_dup,
 647                                          ASN1_STRING_free)) == NULL)
 648             goto err;
 649
 650     if (!unprotected && !ossl_cmp_msg_protect(ctx, msg))
 651         goto err;
 652     return msg;
 653
 654  err:
 655     CMPerr(0, CMP_R_ERROR_CREATING_ERROR);
 656     OSSL_CMP_MSG_free(msg);
 657     return NULL;
 658 }
 659
 660 /*
 661  * OSSL_CMP_CERTSTATUS_set_certHash() calculates a hash of the certificate,
 662  * using the same hash algorithm as is used to create and verify the
 663  * certificate signature, and places the hash into the certHash field of a
 664  * OSSL_CMP_CERTSTATUS structure. This is used in the certConf message,
 665  * for example, to confirm that the certificate was received successfully.
 666  */
 667 int ossl_cmp_certstatus_set_certHash(OSSL_CMP_CERTSTATUS *certStatus,
 668                                      const X509 *cert)
 669 {
 670     unsigned int len;
 671     unsigned char hash[EVP_MAX_MD_SIZE];
 672     int md_NID;
 673     const EVP_MD *md = NULL;
 674
 675     if (!ossl_assert(certStatus != NULL && cert != NULL))
 676         return 0;
 677
 678     /*-
 679      * select hash algorithm, as stated in Appendix F. Compilable ASN.1 defs:
 680      * the hash of the certificate, using the same hash algorithm
 681      * as is used to create and verify the certificate signature
 682      */
 683     if (OBJ_find_sigid_algs(X509_get_signature_nid(cert), &md_NID, NULL)
 684             && (md = EVP_get_digestbynid(md_NID)) != NULL) {
 685         if (!X509_digest(cert, md, hash, &len))
 686             goto err;
 687         if (!ossl_cmp_asn1_octet_string_set1_bytes(&certStatus->certHash, hash,
 688                                                    len))
 689             goto err;
 690     } else {
 691         CMPerr(0, CMP_R_UNSUPPORTED_ALGORITHM);
 692         return 0;
 693     }
 694
 695     return 1;
 696  err:
 697     CMPerr(0, CMP_R_ERROR_SETTING_CERTHASH);
 698     return 0;
 699 }
 700
 701 /*
 702  * TODO: handle potential 2nd certificate when signing and encrypting
 703  * certificates have been requested/received
 704  */
 705 OSSL_CMP_MSG *ossl_cmp_certConf_new(OSSL_CMP_CTX *ctx, int fail_info,
 706                                     const char *text)
 707 {
 708     OSSL_CMP_MSG *msg = NULL;
 709     OSSL_CMP_CERTSTATUS *certStatus = NULL;
 710     OSSL_CMP_PKISI *sinfo;
 711
 712     if (!ossl_assert(ctx != NULL && ctx->newCert != NULL))
 713         return NULL;
 714
 715     if ((unsigned)fail_info > OSSL_CMP_PKIFAILUREINFO_MAX_BIT_PATTERN) {
 716         CMPerr(0, CMP_R_FAIL_INFO_OUT_OF_RANGE);
 717         return NULL;
 718     }
 719
 720     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_CERTCONF)) == NULL)
 721         goto err;
 722
 723     if ((certStatus = OSSL_CMP_CERTSTATUS_new()) == NULL)
 724         goto err;
 725     /* consume certStatus into msg right away so it gets deallocated with msg */
 726     if (!sk_OSSL_CMP_CERTSTATUS_push(msg->body->value.certConf, certStatus))
 727         goto err;
 728     /* set the ID of the certReq */
 729     if (!ASN1_INTEGER_set(certStatus->certReqId, OSSL_CMP_CERTREQID))
 730         goto err;
 731     /*
 732      * the hash of the certificate, using the same hash algorithm
 733      * as is used to create and verify the certificate signature
 734      */
 735     if (!ossl_cmp_certstatus_set_certHash(certStatus, ctx->newCert))
 736         goto err;
 737     /*
 738      * For any particular CertStatus, omission of the statusInfo field
 739      * indicates ACCEPTANCE of the specified certificate.  Alternatively,
 740      * explicit status details (with respect to acceptance or rejection) MAY
 741      * be provided in the statusInfo field, perhaps for auditing purposes at
 742      * the CA/RA.
 743      */
 744     sinfo = fail_info != 0 ?
 745         ossl_cmp_statusinfo_new(OSSL_CMP_PKISTATUS_rejection, fail_info, text) :
 746         ossl_cmp_statusinfo_new(OSSL_CMP_PKISTATUS_accepted, 0, text);
 747     if (sinfo == NULL)
 748         goto err;
 749     certStatus->statusInfo = sinfo;
 750
 751     if (!ossl_cmp_msg_protect(ctx, msg))
 752         goto err;
 753
 754     return msg;
 755
 756  err:
 757     CMPerr(0, CMP_R_ERROR_CREATING_CERTCONF);
 758     OSSL_CMP_MSG_free(msg);
 759     return NULL;
 760 }
 761
 762 OSSL_CMP_MSG *ossl_cmp_pollReq_new(OSSL_CMP_CTX *ctx, int crid)
 763 {
 764     OSSL_CMP_MSG *msg = NULL;
 765     OSSL_CMP_POLLREQ *preq = NULL;
 766
 767     if (!ossl_assert(ctx != NULL))
 768         return NULL;
 769
 770     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_POLLREQ)) == NULL)
 771         goto err;
 772
 773     /* TODO: support multiple cert request IDs to poll */
 774     if ((preq = OSSL_CMP_POLLREQ_new()) == NULL
 775             || !ASN1_INTEGER_set(preq->certReqId, crid)
 776             || !sk_OSSL_CMP_POLLREQ_push(msg->body->value.pollReq, preq))
 777         goto err;
 778
 779     preq = NULL;
 780     if (!ossl_cmp_msg_protect(ctx, msg))
 781         goto err;
 782
 783     return msg;
 784
 785  err:
 786     CMPerr(0, CMP_R_ERROR_CREATING_POLLREQ);
 787     OSSL_CMP_POLLREQ_free(preq);
 788     OSSL_CMP_MSG_free(msg);
 789     return NULL;
 790 }
 791
 792 OSSL_CMP_MSG *ossl_cmp_pollRep_new(OSSL_CMP_CTX *ctx, int crid,
 793                                    int64_t poll_after)
 794 {
 795     OSSL_CMP_MSG *msg;
 796     OSSL_CMP_POLLREP *prep;
 797
 798     if (!ossl_assert(ctx != NULL))
 799         return NULL;
 800
 801     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_POLLREP)) == NULL)
 802         goto err;
 803     if ((prep = OSSL_CMP_POLLREP_new()) == NULL)
 804         goto err;
 805     if (!sk_OSSL_CMP_POLLREP_push(msg->body->value.pollRep, prep))
 806         goto err;
 807     if (!ASN1_INTEGER_set(prep->certReqId, crid))
 808         goto err;
 809     if (!ASN1_INTEGER_set_int64(prep->checkAfter, poll_after))
 810         goto err;
 811
 812     if (!ossl_cmp_msg_protect(ctx, msg))
 813         goto err;
 814     return msg;
 815
 816  err:
 817     CMPerr(0, CMP_R_ERROR_CREATING_POLLREP);
 818     OSSL_CMP_MSG_free(msg);
 819     return NULL;
 820 }
 821
 822 /*-
 823  * returns the status field of the RevRepContent with the given
 824  * request/sequence id inside a revocation response.
 825  * RevRepContent has the revocation statuses in same order as they were sent in
 826  * RevReqContent.
 827  * returns NULL on error
 828  */
 829 OSSL_CMP_PKISI *
 830 ossl_cmp_revrepcontent_get_pkistatusinfo(OSSL_CMP_REVREPCONTENT *rrep, int rsid)
 831 {
 832     OSSL_CMP_PKISI *status;
 833
 834     if (!ossl_assert(rrep != NULL))
 835         return NULL;
 836
 837     if ((status = sk_OSSL_CMP_PKISI_value(rrep->status, rsid)) != NULL)
 838         return status;
 839
 840     CMPerr(0, CMP_R_PKISTATUSINFO_NOT_FOUND);
 841     return NULL;
 842 }
 843
 844 /*
 845  * returns the CertId field in the revCerts part of the RevRepContent
 846  * with the given request/sequence id inside a revocation response.
 847  * RevRepContent has the CertIds in same order as they were sent in
 848  * RevReqContent.
 849  * returns NULL on error
 850  */
 851 OSSL_CRMF_CERTID *
 852 ossl_cmp_revrepcontent_get_CertId(OSSL_CMP_REVREPCONTENT *rrep, int rsid)
 853 {
 854     OSSL_CRMF_CERTID *cid = NULL;
 855
 856     if (!ossl_assert(rrep != NULL))
 857         return NULL;
 858
 859     if ((cid = sk_OSSL_CRMF_CERTID_value(rrep->revCerts, rsid)) != NULL)
 860         return cid;
 861
 862     CMPerr(0, CMP_R_CERTID_NOT_FOUND);
 863     return NULL;
 864 }
 865
 866 static int suitable_rid(const ASN1_INTEGER *certReqId, int rid)
 867 {
 868     int trid;
 869
 870     if (rid == -1)
 871         return 1;
 872
 873     trid = ossl_cmp_asn1_get_int(certReqId);
 874
 875     if (trid == -1) {
 876         CMPerr(0, CMP_R_BAD_REQUEST_ID);
 877         return 0;
 878     }
 879     return rid == trid;
 880 }
 881
 882 static void add_expected_rid(int rid)
 883 {
 884     char str[DECIMAL_SIZE(rid) + 1];
 885
 886     BIO_snprintf(str, sizeof(str), "%d", rid);
 887     ERR_add_error_data(2, "expected certReqId = ", str);
 888 }
 889
 890 /*
 891  * returns a pointer to the PollResponse with the given CertReqId
 892  * (or the first one in case -1) inside a PollRepContent
 893  * returns NULL on error or if no suitable PollResponse available
 894  */
 895 OSSL_CMP_POLLREP *
 896 ossl_cmp_pollrepcontent_get0_pollrep(const OSSL_CMP_POLLREPCONTENT *prc,
 897                                      int rid)
 898 {
 899     OSSL_CMP_POLLREP *pollRep = NULL;
 900     int i;
 901
 902     if (!ossl_assert(prc != NULL))
 903         return NULL;
 904
 905     for (i = 0; i < sk_OSSL_CMP_POLLREP_num(prc); i++) {
 906         pollRep = sk_OSSL_CMP_POLLREP_value(prc, i);
 907         if (suitable_rid(pollRep->certReqId, rid))
 908             return pollRep;
 909     }
 910
 911     CMPerr(0, CMP_R_CERTRESPONSE_NOT_FOUND);
 912     add_expected_rid(rid);
 913     return NULL;
 914 }
 915
 916 /*
 917  * returns a pointer to the CertResponse with the given CertReqId
 918  * (or the first one in case -1) inside a CertRepMessage
 919  * returns NULL on error or if no suitable CertResponse available
 920  */
 921 OSSL_CMP_CERTRESPONSE *
 922 ossl_cmp_certrepmessage_get0_certresponse(const OSSL_CMP_CERTREPMESSAGE *crm,
 923                                           int rid)
 924 {
 925     OSSL_CMP_CERTRESPONSE *crep = NULL;
 926     int i;
 927
 928     if (!ossl_assert(crm != NULL && crm->response != NULL))
 929         return NULL;
 930
 931     for (i = 0; i < sk_OSSL_CMP_CERTRESPONSE_num(crm->response); i++) {
 932         crep = sk_OSSL_CMP_CERTRESPONSE_value(crm->response, i);
 933         if (suitable_rid(crep->certReqId, rid))
 934             return crep;
 935     }
 936
 937     CMPerr(0, CMP_R_CERTRESPONSE_NOT_FOUND);
 938     add_expected_rid(rid);
 939     return NULL;
 940 }
 941
 942 /*
 943  * CMP_CERTRESPONSE_get1_certificate() attempts to retrieve the returned
 944  * certificate from the given certResponse B<crep>.
 945  * Uses the privkey in case of indirect POP from B<ctx>.
 946  * Returns a pointer to a copy of the found certificate, or NULL if not found.
 947  */
 948 X509 *ossl_cmp_certresponse_get1_certificate(EVP_PKEY *privkey,
 949                                              const OSSL_CMP_CERTRESPONSE *crep)
 950 {
 951     OSSL_CMP_CERTORENCCERT *coec;
 952     X509 *crt = NULL;
 953
 954     if (!ossl_assert(crep != NULL))
 955         return NULL;
 956
 957     if (crep->certifiedKeyPair
 958             && (coec = crep->certifiedKeyPair->certOrEncCert) != NULL) {
 959         switch (coec->type) {
 960         case OSSL_CMP_CERTORENCCERT_CERTIFICATE:
 961             crt = X509_dup(coec->value.certificate);
 962             break;
 963         case OSSL_CMP_CERTORENCCERT_ENCRYPTEDCERT:
 964             /* cert encrypted for indirect PoP; RFC 4210, 5.2.8.2 */
 965             if (privkey == NULL) {
 966                 CMPerr(0, CMP_R_MISSING_PRIVATE_KEY);
 967                 return NULL;
 968             }
 969             crt =
 970                 OSSL_CRMF_ENCRYPTEDVALUE_get1_encCert(coec->value.encryptedCert,
 971                                                       privkey);
 972             break;
 973         default:
 974             CMPerr(0, CMP_R_UNKNOWN_CERT_TYPE);
 975             return NULL;
 976         }
 977     }
 978     if (crt == NULL)
 979         CMPerr(0, CMP_R_CERTIFICATE_NOT_FOUND);
 980     return crt;
 981 }
 982
 983 OSSL_CMP_MSG *ossl_cmp_msg_load(const char *file)
 984 {
 985     OSSL_CMP_MSG *msg = NULL;
 986     BIO *bio = NULL;
 987
 988     if (!ossl_assert(file != NULL))
 989         return NULL;
 990
 991     if ((bio = BIO_new_file(file, "rb")) == NULL)
 992         return NULL;
 993     msg = OSSL_d2i_CMP_MSG_bio(bio, NULL);
 994     BIO_free(bio);
 995     return msg;
 996 }