crypto/cmp/cmp_msg.c

   1 /*
   2  * Copyright 2007-2020 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 DEFINE_STACK_OF(OSSL_CMP_CERTSTATUS)
  24 DEFINE_STACK_OF(OSSL_CMP_ITAV)
  25 DEFINE_STACK_OF(GENERAL_NAME)
  26 DEFINE_STACK_OF(X509)
  27 DEFINE_STACK_OF(X509_EXTENSION)
  28 DEFINE_STACK_OF(OSSL_CMP_PKISI)
  29 DEFINE_STACK_OF(OSSL_CRMF_MSG)
  30 DEFINE_STACK_OF(OSSL_CMP_CERTRESPONSE)
  31 DEFINE_STACK_OF(OSSL_CRMF_CERTID)
  32 DEFINE_STACK_OF(ASN1_UTF8STRING)
  33
  34 OSSL_CMP_PKIHEADER *OSSL_CMP_MSG_get0_header(const OSSL_CMP_MSG *msg)
  35 {
  36     if (msg == NULL) {
  37         CMPerr(0, CMP_R_NULL_ARGUMENT);
  38         return NULL;
  39     }
  40     return msg->header;
  41 }
  42
  43 const char *ossl_cmp_bodytype_to_string(int type)
  44 {
  45     static const char *type_names[] = {
  46         "IR", "IP", "CR", "CP", "P10CR",
  47         "POPDECC", "POPDECR", "KUR", "KUP",
  48         "KRR", "KRP", "RR", "RP", "CCR", "CCP",
  49         "CKUANN", "CANN", "RANN", "CRLANN", "PKICONF", "NESTED",
  50         "GENM", "GENP", "ERROR", "CERTCONF", "POLLREQ", "POLLREP",
  51     };
  52
  53     if (type < 0 || type > OSSL_CMP_PKIBODY_TYPE_MAX)
  54         return "illegal body type";
  55     return type_names[type];
  56 }
  57
  58 int ossl_cmp_msg_set_bodytype(OSSL_CMP_MSG *msg, int type)
  59 {
  60     if (!ossl_assert(msg != NULL && msg->body != NULL))
  61         return 0;
  62
  63     msg->body->type = type;
  64     return 1;
  65 }
  66
  67 int ossl_cmp_msg_get_bodytype(const OSSL_CMP_MSG *msg)
  68 {
  69     if (!ossl_assert(msg != NULL && msg->body != NULL))
  70         return -1;
  71
  72     return msg->body->type;
  73 }
  74
  75 /* Add an extension to the referenced extension stack, which may be NULL */
  76 static int add1_extension(X509_EXTENSIONS **pexts, int nid, int crit, void *ex)
  77 {
  78     X509_EXTENSION *ext;
  79     int res;
  80
  81     if (!ossl_assert(pexts != NULL)) /* pointer to var must not be NULL */
  82         return 0;
  83
  84     if ((ext = X509V3_EXT_i2d(nid, crit, ex)) == NULL)
  85         return 0;
  86
  87     res = X509v3_add_ext(pexts, ext, 0) != NULL;
  88     X509_EXTENSION_free(ext);
  89     return res;
  90 }
  91
  92 /* Add a CRL revocation reason code to extension stack, which may be NULL */
  93 static int add_crl_reason_extension(X509_EXTENSIONS **pexts, int reason_code)
  94 {
  95     ASN1_ENUMERATED *val = ASN1_ENUMERATED_new();
  96     int res = 0;
  97
  98     if (val != NULL && ASN1_ENUMERATED_set(val, reason_code))
  99         res = add1_extension(pexts, NID_crl_reason, 0 /* non-critical */, val);
 100     ASN1_ENUMERATED_free(val);
 101     return res;
 102 }
 103
 104 OSSL_CMP_MSG *ossl_cmp_msg_create(OSSL_CMP_CTX *ctx, int bodytype)
 105 {
 106     OSSL_CMP_MSG *msg = NULL;
 107
 108     if (!ossl_assert(ctx != NULL))
 109         return NULL;
 110
 111     if ((msg = OSSL_CMP_MSG_new()) == NULL)
 112         return NULL;
 113     if (!ossl_cmp_hdr_init(ctx, msg->header)
 114             || !ossl_cmp_msg_set_bodytype(msg, bodytype))
 115         goto err;
 116     if (ctx->geninfo_ITAVs != NULL
 117             && !ossl_cmp_hdr_generalInfo_push1_items(msg->header,
 118                                                      ctx->geninfo_ITAVs))
 119         goto err;
 120
 121     switch (bodytype) {
 122     case OSSL_CMP_PKIBODY_IR:
 123     case OSSL_CMP_PKIBODY_CR:
 124     case OSSL_CMP_PKIBODY_KUR:
 125         if ((msg->body->value.ir = OSSL_CRMF_MSGS_new()) == NULL)
 126             goto err;
 127         return msg;
 128
 129     case OSSL_CMP_PKIBODY_P10CR:
 130         if (ctx->p10CSR == NULL) {
 131             CMPerr(0, CMP_R_ERROR_CREATING_P10CR);
 132             goto err;
 133         }
 134         if ((msg->body->value.p10cr = X509_REQ_dup(ctx->p10CSR)) == NULL)
 135             goto err;
 136         return msg;
 137
 138     case OSSL_CMP_PKIBODY_IP:
 139     case OSSL_CMP_PKIBODY_CP:
 140     case OSSL_CMP_PKIBODY_KUP:
 141         if ((msg->body->value.ip = OSSL_CMP_CERTREPMESSAGE_new()) == NULL)
 142             goto err;
 143         return msg;
 144
 145     case OSSL_CMP_PKIBODY_RR:
 146         if ((msg->body->value.rr = sk_OSSL_CMP_REVDETAILS_new_null()) == NULL)
 147             goto err;
 148         return msg;
 149     case OSSL_CMP_PKIBODY_RP:
 150         if ((msg->body->value.rp = OSSL_CMP_REVREPCONTENT_new()) == NULL)
 151             goto err;
 152         return msg;
 153
 154     case OSSL_CMP_PKIBODY_CERTCONF:
 155         if ((msg->body->value.certConf =
 156              sk_OSSL_CMP_CERTSTATUS_new_null()) == NULL)
 157             goto err;
 158         return msg;
 159     case OSSL_CMP_PKIBODY_PKICONF:
 160         if ((msg->body->value.pkiconf = ASN1_TYPE_new()) == NULL)
 161             goto err;
 162         ASN1_TYPE_set(msg->body->value.pkiconf, V_ASN1_NULL, NULL);
 163         return msg;
 164
 165     case OSSL_CMP_PKIBODY_POLLREQ:
 166         if ((msg->body->value.pollReq = sk_OSSL_CMP_POLLREQ_new_null()) == NULL)
 167             goto err;
 168         return msg;
 169     case OSSL_CMP_PKIBODY_POLLREP:
 170         if ((msg->body->value.pollRep = sk_OSSL_CMP_POLLREP_new_null()) == NULL)
 171             goto err;
 172         return msg;
 173
 174     case OSSL_CMP_PKIBODY_GENM:
 175     case OSSL_CMP_PKIBODY_GENP:
 176         if ((msg->body->value.genm = sk_OSSL_CMP_ITAV_new_null()) == NULL)
 177             goto err;
 178         return msg;
 179
 180     case OSSL_CMP_PKIBODY_ERROR:
 181         if ((msg->body->value.error = OSSL_CMP_ERRORMSGCONTENT_new()) == NULL)
 182             goto err;
 183         return msg;
 184
 185     default:
 186         CMPerr(0, CMP_R_UNEXPECTED_PKIBODY);
 187         goto err;
 188     }
 189
 190  err:
 191     OSSL_CMP_MSG_free(msg);
 192     return NULL;
 193 }
 194
 195 #define HAS_SAN(ctx) \
 196     (sk_GENERAL_NAME_num((ctx)->subjectAltNames) > 0 \
 197          || OSSL_CMP_CTX_reqExtensions_have_SAN(ctx) == 1)
 198
 199 static const X509_NAME *determine_subj(OSSL_CMP_CTX *ctx, X509 *refcert,
 200                                        int bodytype)
 201 {
 202     if (ctx->subjectName != NULL)
 203         return ctx->subjectName;
 204
 205     if (refcert != NULL
 206             && (bodytype == OSSL_CMP_PKIBODY_KUR || !HAS_SAN(ctx)))
 207         /*
 208          * For KUR, copy subjectName from reference certificate.
 209          * For IR or CR, do the same only if there is no subjectAltName.
 210          */
 211         return X509_get_subject_name(refcert);
 212     return NULL;
 213 }
 214
 215 /*
 216  * Create CRMF certificate request message for IR/CR/KUR
 217  * returns a pointer to the OSSL_CRMF_MSG on success, NULL on error
 218  */
 219 static OSSL_CRMF_MSG *crm_new(OSSL_CMP_CTX *ctx, int bodytype, int rid)
 220 {
 221     OSSL_CRMF_MSG *crm = NULL;
 222     X509 *refcert = ctx->oldCert != NULL ? ctx->oldCert : ctx->cert;
 223     /* refcert defaults to current client cert */
 224     EVP_PKEY *rkey = OSSL_CMP_CTX_get0_newPkey(ctx, 0);
 225     STACK_OF(GENERAL_NAME) *default_sans = NULL;
 226     const X509_NAME *subject = determine_subj(ctx, refcert, bodytype);
 227     int crit = ctx->setSubjectAltNameCritical || subject == NULL;
 228     /* RFC5280: subjectAltName MUST be critical if subject is null */
 229     X509_EXTENSIONS *exts = NULL;
 230
 231     if (rkey == NULL)
 232         rkey = ctx->pkey; /* default is independent of ctx->oldCert */
 233     if (rkey == NULL) {
 234 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 235         CMPerr(0, CMP_R_NULL_ARGUMENT);
 236         return NULL;
 237 #endif
 238     }
 239     if (bodytype == OSSL_CMP_PKIBODY_KUR && refcert == NULL) {
 240         CMPerr(0, CMP_R_MISSING_REFERENCE_CERT);
 241         return NULL;
 242     }
 243     if ((crm = OSSL_CRMF_MSG_new()) == NULL)
 244         return NULL;
 245     if (!OSSL_CRMF_MSG_set_certReqId(crm, rid)
 246             /*
 247              * fill certTemplate, corresponding to CertificationRequestInfo
 248              * of PKCS#10. The rkey param cannot be NULL so far -
 249              * it could be NULL if centralized key creation was supported
 250              */
 251             || !OSSL_CRMF_CERTTEMPLATE_fill(OSSL_CRMF_MSG_get0_tmpl(crm), rkey,
 252                                             subject, ctx->issuer,
 253                                             NULL /* serial */))
 254         goto err;
 255     if (ctx->days != 0) {
 256         time_t now = time(NULL);
 257         ASN1_TIME *notBefore = ASN1_TIME_adj(NULL, now, 0, 0);
 258         ASN1_TIME *notAfter = ASN1_TIME_adj(NULL, now, ctx->days, 0);
 259
 260         if (notBefore == NULL
 261                 || notAfter == NULL
 262                 || !OSSL_CRMF_MSG_set0_validity(crm, notBefore, notAfter)) {
 263             ASN1_TIME_free(notBefore);
 264             ASN1_TIME_free(notAfter);
 265             goto err;
 266         }
 267     }
 268
 269     /* extensions */
 270     if (refcert != NULL && !ctx->SubjectAltName_nodefault)
 271         default_sans = X509V3_get_d2i(X509_get0_extensions(refcert),
 272                                       NID_subject_alt_name, NULL, NULL);
 273     /* exts are copied from ctx to allow reuse */
 274     if (ctx->reqExtensions != NULL) {
 275         exts = sk_X509_EXTENSION_deep_copy(ctx->reqExtensions,
 276                                            X509_EXTENSION_dup,
 277                                            X509_EXTENSION_free);
 278         if (exts == NULL)
 279             goto err;
 280     }
 281     if (sk_GENERAL_NAME_num(ctx->subjectAltNames) > 0
 282             && !add1_extension(&exts, NID_subject_alt_name,
 283                                crit, ctx->subjectAltNames))
 284         goto err;
 285     if (!HAS_SAN(ctx) && default_sans != NULL
 286             && !add1_extension(&exts, NID_subject_alt_name, crit, default_sans))
 287         goto err;
 288     if (ctx->policies != NULL
 289             && !add1_extension(&exts, NID_certificate_policies,
 290                                ctx->setPoliciesCritical, ctx->policies))
 291         goto err;
 292     if (!OSSL_CRMF_MSG_set0_extensions(crm, exts))
 293         goto err;
 294     exts = NULL;
 295     /* end fill certTemplate, now set any controls */
 296
 297     /* for KUR, set OldCertId according to D.6 */
 298     if (bodytype == OSSL_CMP_PKIBODY_KUR) {
 299         OSSL_CRMF_CERTID *cid =
 300             OSSL_CRMF_CERTID_gen(X509_get_issuer_name(refcert),
 301                                  X509_get0_serialNumber(refcert));
 302         int ret;
 303
 304         if (cid == NULL)
 305             goto err;
 306         ret = OSSL_CRMF_MSG_set1_regCtrl_oldCertID(crm, cid);
 307         OSSL_CRMF_CERTID_free(cid);
 308         if (ret == 0)
 309             goto err;
 310     }
 311
 312     goto end;
 313
 314  err:
 315     OSSL_CRMF_MSG_free(crm);
 316     crm = NULL;
 317
 318  end:
 319     sk_X509_EXTENSION_pop_free(exts, X509_EXTENSION_free);
 320     sk_GENERAL_NAME_pop_free(default_sans, GENERAL_NAME_free);
 321     return crm;
 322 }
 323
 324 OSSL_CMP_MSG *ossl_cmp_certReq_new(OSSL_CMP_CTX *ctx, int type, int err_code)
 325 {
 326     OSSL_CMP_MSG *msg;
 327     OSSL_CRMF_MSG *crm = NULL;
 328
 329     if (!ossl_assert(ctx != NULL))
 330         return NULL;
 331
 332     if (type != OSSL_CMP_PKIBODY_IR && type != OSSL_CMP_PKIBODY_CR
 333             && type != OSSL_CMP_PKIBODY_KUR && type != OSSL_CMP_PKIBODY_P10CR) {
 334         CMPerr(0, CMP_R_INVALID_ARGS);
 335         return NULL;
 336     }
 337
 338     if ((msg = ossl_cmp_msg_create(ctx, type)) == NULL)
 339         goto err;
 340
 341     /* header */
 342     if (ctx->implicitConfirm && !ossl_cmp_hdr_set_implicitConfirm(msg->header))
 343         goto err;
 344
 345     /* body */
 346     /* For P10CR the content has already been set in OSSL_CMP_MSG_create */
 347     if (type != OSSL_CMP_PKIBODY_P10CR) {
 348         EVP_PKEY *privkey = OSSL_CMP_CTX_get0_newPkey(ctx, 1);
 349
 350         if (privkey == NULL)
 351             privkey = ctx->pkey; /* default is independent of ctx->oldCert */
 352         if (ctx->popoMethod == OSSL_CRMF_POPO_SIGNATURE && privkey == NULL) {
 353             CMPerr(0, CMP_R_MISSING_PRIVATE_KEY);
 354             goto err;
 355         }
 356         if ((crm = crm_new(ctx, type, OSSL_CMP_CERTREQID)) == NULL
 357             || !OSSL_CRMF_MSG_create_popo(crm, privkey, ctx->digest,
 358                                           ctx->popoMethod)
 359             /* value.ir is same for cr and kur */
 360             || !sk_OSSL_CRMF_MSG_push(msg->body->value.ir, crm))
 361             goto err;
 362         crm = NULL;
 363         /* TODO: here optional 2nd certreqmsg could be pushed to the stack */
 364     }
 365
 366     if (!ossl_cmp_msg_protect(ctx, msg))
 367         goto err;
 368
 369     return msg;
 370
 371  err:
 372     if (err_code != 0)
 373         CMPerr(0, err_code);
 374     OSSL_CRMF_MSG_free(crm);
 375     OSSL_CMP_MSG_free(msg);
 376     return NULL;
 377 }
 378
 379 OSSL_CMP_MSG *ossl_cmp_certRep_new(OSSL_CMP_CTX *ctx, int bodytype,
 380                                    int certReqId, OSSL_CMP_PKISI *si,
 381                                    X509 *cert, STACK_OF(X509) *chain,
 382                                    STACK_OF(X509) *caPubs, int encrypted,
 383                                    int unprotectedErrors)
 384 {
 385     OSSL_CMP_MSG *msg = NULL;
 386     OSSL_CMP_CERTREPMESSAGE *repMsg = NULL;
 387     OSSL_CMP_CERTRESPONSE *resp = NULL;
 388     int status = -1;
 389
 390     if (!ossl_assert(ctx != NULL && si != NULL))
 391         return NULL;
 392
 393     if ((msg = ossl_cmp_msg_create(ctx, bodytype)) == NULL)
 394         goto err;
 395     repMsg = msg->body->value.ip; /* value.ip is same for cp and kup */
 396
 397     /* header */
 398     if (ctx->implicitConfirm && !ossl_cmp_hdr_set_implicitConfirm(msg->header))
 399         goto err;
 400
 401     /* body */
 402     if ((resp = OSSL_CMP_CERTRESPONSE_new()) == NULL)
 403         goto err;
 404     OSSL_CMP_PKISI_free(resp->status);
 405     if ((resp->status = OSSL_CMP_PKISI_dup(si)) == NULL
 406             || !ASN1_INTEGER_set(resp->certReqId, certReqId))
 407         goto err;
 408
 409     status = ossl_cmp_pkisi_get_status(resp->status);
 410     if (status != OSSL_CMP_PKISTATUS_rejection
 411             && status != OSSL_CMP_PKISTATUS_waiting && cert != NULL) {
 412         if (encrypted) {
 413             CMPerr(0, CMP_R_INVALID_ARGS);
 414             goto err;
 415         }
 416
 417         if ((resp->certifiedKeyPair = OSSL_CMP_CERTIFIEDKEYPAIR_new())
 418             == NULL)
 419             goto err;
 420         resp->certifiedKeyPair->certOrEncCert->type =
 421             OSSL_CMP_CERTORENCCERT_CERTIFICATE;
 422         if (!X509_up_ref(cert))
 423             goto err;
 424         resp->certifiedKeyPair->certOrEncCert->value.certificate = cert;
 425     }
 426
 427     if (!sk_OSSL_CMP_CERTRESPONSE_push(repMsg->response, resp))
 428         goto err;
 429     resp = NULL;
 430     /* TODO: here optional 2nd certrep could be pushed to the stack */
 431
 432     if (bodytype == OSSL_CMP_PKIBODY_IP && caPubs != NULL
 433             && (repMsg->caPubs = X509_chain_up_ref(caPubs)) == NULL)
 434         goto err;
 435     if (sk_X509_num(chain) > 0) {
 436         msg->extraCerts = sk_X509_new_reserve(NULL, sk_X509_num(chain));
 437         if (msg->extraCerts == NULL
 438             || !ossl_cmp_sk_X509_add1_certs(msg->extraCerts, chain, 0, 1, 0))
 439         goto err;
 440     }
 441
 442     if (!unprotectedErrors
 443             || ossl_cmp_pkisi_get_status(si) != OSSL_CMP_PKISTATUS_rejection)
 444         if (!ossl_cmp_msg_protect(ctx, msg))
 445             goto err;
 446
 447     return msg;
 448
 449  err:
 450     CMPerr(0, CMP_R_ERROR_CREATING_CERTREP);
 451     OSSL_CMP_CERTRESPONSE_free(resp);
 452     OSSL_CMP_MSG_free(msg);
 453     return NULL;
 454 }
 455
 456 OSSL_CMP_MSG *ossl_cmp_rr_new(OSSL_CMP_CTX *ctx)
 457 {
 458     OSSL_CMP_MSG *msg = NULL;
 459     OSSL_CMP_REVDETAILS *rd;
 460
 461     if (!ossl_assert(ctx != NULL && ctx->oldCert != NULL))
 462         return NULL;
 463
 464     if ((rd = OSSL_CMP_REVDETAILS_new()) == NULL)
 465         goto err;
 466
 467     /* Fill the template from the contents of the certificate to be revoked */
 468     if (!OSSL_CRMF_CERTTEMPLATE_fill(rd->certDetails,
 469                                      NULL /* pubkey would be redundant */,
 470                                      NULL /* subject would be redundant */,
 471                                      X509_get_issuer_name(ctx->oldCert),
 472                                      X509_get0_serialNumber(ctx->oldCert)))
 473         goto err;
 474
 475     /* revocation reason code is optional */
 476     if (ctx->revocationReason != CRL_REASON_NONE
 477             && !add_crl_reason_extension(&rd->crlEntryDetails,
 478                                          ctx->revocationReason))
 479         goto err;
 480
 481     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_RR)) == NULL)
 482         goto err;
 483
 484     if (!sk_OSSL_CMP_REVDETAILS_push(msg->body->value.rr, rd))
 485         goto err;
 486     rd = NULL;
 487
 488     /*
 489      * TODO: the Revocation Passphrase according to section 5.3.19.9 could be
 490      *       set here if set in ctx
 491      */
 492
 493     if (!ossl_cmp_msg_protect(ctx, msg))
 494         goto err;
 495
 496     return msg;
 497
 498  err:
 499     CMPerr(0, CMP_R_ERROR_CREATING_RR);
 500     OSSL_CMP_MSG_free(msg);
 501     OSSL_CMP_REVDETAILS_free(rd);
 502     return NULL;
 503 }
 504
 505 OSSL_CMP_MSG *ossl_cmp_rp_new(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si,
 506                               OSSL_CRMF_CERTID *cid, int unprot_err)
 507 {
 508     OSSL_CMP_REVREPCONTENT *rep = NULL;
 509     OSSL_CMP_PKISI *si1 = NULL;
 510     OSSL_CRMF_CERTID *cid_copy = NULL;
 511     OSSL_CMP_MSG *msg = NULL;
 512
 513     if (!ossl_assert(ctx != NULL && si != NULL && cid != NULL))
 514         return NULL;
 515
 516     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_RP)) == NULL)
 517         goto err;
 518     rep = msg->body->value.rp;
 519
 520     if ((si1 = OSSL_CMP_PKISI_dup(si)) == NULL)
 521         goto err;
 522
 523     if (!sk_OSSL_CMP_PKISI_push(rep->status, si1)) {
 524         OSSL_CMP_PKISI_free(si1);
 525         goto err;
 526     }
 527
 528     if ((rep->revCerts = sk_OSSL_CRMF_CERTID_new_null()) == NULL)
 529         goto err;
 530     if ((cid_copy = OSSL_CRMF_CERTID_dup(cid)) == NULL)
 531         goto err;
 532     if (!sk_OSSL_CRMF_CERTID_push(rep->revCerts, cid_copy)) {
 533         OSSL_CRMF_CERTID_free(cid_copy);
 534         goto err;
 535     }
 536
 537     if (!unprot_err
 538             || ossl_cmp_pkisi_get_status(si) != OSSL_CMP_PKISTATUS_rejection)
 539         if (!ossl_cmp_msg_protect(ctx, msg))
 540             goto err;
 541
 542     return msg;
 543
 544  err:
 545     CMPerr(0, CMP_R_ERROR_CREATING_RP);
 546     OSSL_CMP_MSG_free(msg);
 547     return NULL;
 548 }
 549
 550 OSSL_CMP_MSG *ossl_cmp_pkiconf_new(OSSL_CMP_CTX *ctx)
 551 {
 552     OSSL_CMP_MSG *msg;
 553
 554     if (!ossl_assert(ctx != NULL))
 555         return NULL;
 556
 557     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_PKICONF)) == NULL)
 558         goto err;
 559     if (ossl_cmp_msg_protect(ctx, msg))
 560         return msg;
 561
 562  err:
 563     CMPerr(0, CMP_R_ERROR_CREATING_PKICONF);
 564     OSSL_CMP_MSG_free(msg);
 565     return NULL;
 566 }
 567
 568 int ossl_cmp_msg_gen_push0_ITAV(OSSL_CMP_MSG *msg, OSSL_CMP_ITAV *itav)
 569 {
 570     int bodytype;
 571
 572     if (!ossl_assert(msg != NULL && itav != NULL))
 573         return 0;
 574
 575     bodytype = ossl_cmp_msg_get_bodytype(msg);
 576     if (bodytype != OSSL_CMP_PKIBODY_GENM
 577             && bodytype != OSSL_CMP_PKIBODY_GENP) {
 578         CMPerr(0, CMP_R_INVALID_ARGS);
 579         return 0;
 580     }
 581
 582     /* value.genp has the same structure, so this works for genp as well */
 583     return OSSL_CMP_ITAV_push0_stack_item(&msg->body->value.genm, itav);
 584 }
 585
 586 int ossl_cmp_msg_gen_push1_ITAVs(OSSL_CMP_MSG *msg,
 587                                  const STACK_OF(OSSL_CMP_ITAV) *itavs)
 588 {
 589     int i;
 590     OSSL_CMP_ITAV *itav = NULL;
 591
 592     if (!ossl_assert(msg != NULL))
 593         return 0;
 594
 595     for (i = 0; i < sk_OSSL_CMP_ITAV_num(itavs); i++) {
 596         itav = OSSL_CMP_ITAV_dup(sk_OSSL_CMP_ITAV_value(itavs, i));
 597         if (itav == NULL
 598                 || !ossl_cmp_msg_gen_push0_ITAV(msg, itav)) {
 599             OSSL_CMP_ITAV_free(itav);
 600             return 0;
 601         }
 602     }
 603     return 1;
 604 }
 605
 606 /*
 607  * Creates a new General Message/Response with an empty itav stack
 608  * returns a pointer to the PKIMessage on success, NULL on error
 609  */
 610 static OSSL_CMP_MSG *gen_new(OSSL_CMP_CTX *ctx,
 611                              const STACK_OF(OSSL_CMP_ITAV) *itavs,
 612                              int body_type, int err_code)
 613 {
 614     OSSL_CMP_MSG *msg = NULL;
 615
 616     if (!ossl_assert(ctx != NULL))
 617         return NULL;
 618
 619     if ((msg = ossl_cmp_msg_create(ctx, body_type)) == NULL)
 620         return NULL;
 621
 622     if (ctx->genm_ITAVs != NULL
 623             && !ossl_cmp_msg_gen_push1_ITAVs(msg, itavs))
 624         goto err;
 625
 626     if (!ossl_cmp_msg_protect(ctx, msg))
 627         goto err;
 628
 629     return msg;
 630
 631  err:
 632     CMPerr(0, err_code);
 633     OSSL_CMP_MSG_free(msg);
 634     return NULL;
 635 }
 636
 637 OSSL_CMP_MSG *ossl_cmp_genm_new(OSSL_CMP_CTX *ctx)
 638 {
 639     return gen_new(ctx, ctx->genm_ITAVs,
 640                    OSSL_CMP_PKIBODY_GENM, CMP_R_ERROR_CREATING_GENM);
 641 }
 642
 643 OSSL_CMP_MSG *ossl_cmp_genp_new(OSSL_CMP_CTX *ctx,
 644                                 const STACK_OF(OSSL_CMP_ITAV) *itavs)
 645 {
 646     return gen_new(ctx, itavs,
 647                    OSSL_CMP_PKIBODY_GENP, CMP_R_ERROR_CREATING_GENP);
 648 }
 649
 650 OSSL_CMP_MSG *ossl_cmp_error_new(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si,
 651                                  int errorCode,
 652                                  const char *details, int unprotected)
 653 {
 654     OSSL_CMP_MSG *msg = NULL;
 655     OSSL_CMP_PKIFREETEXT *ft;
 656
 657     if (!ossl_assert(ctx != NULL && si != NULL))
 658         return NULL;
 659
 660     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_ERROR)) == NULL)
 661         goto err;
 662
 663     OSSL_CMP_PKISI_free(msg->body->value.error->pKIStatusInfo);
 664     if ((msg->body->value.error->pKIStatusInfo = OSSL_CMP_PKISI_dup(si))
 665         == NULL)
 666         goto err;
 667     if (errorCode >= 0) {
 668         if ((msg->body->value.error->errorCode = ASN1_INTEGER_new()) == NULL)
 669             goto err;
 670         if (!ASN1_INTEGER_set(msg->body->value.error->errorCode, errorCode))
 671             goto err;
 672     }
 673     if (details != NULL) {
 674         if ((ft = sk_ASN1_UTF8STRING_new_null()) == NULL)
 675             goto err;
 676         msg->body->value.error->errorDetails = ft;
 677         if (!ossl_cmp_sk_ASN1_UTF8STRING_push_str(ft, details))
 678             goto err;
 679     }
 680
 681     if (!unprotected && !ossl_cmp_msg_protect(ctx, msg))
 682         goto err;
 683     return msg;
 684
 685  err:
 686     CMPerr(0, CMP_R_ERROR_CREATING_ERROR);
 687     OSSL_CMP_MSG_free(msg);
 688     return NULL;
 689 }
 690
 691 /*
 692  * Set the certHash field of a OSSL_CMP_CERTSTATUS structure.
 693  * This is used in the certConf message, for example,
 694  * to confirm that the certificate was received successfully.
 695  */
 696 int ossl_cmp_certstatus_set0_certHash(OSSL_CMP_CERTSTATUS *certStatus,
 697                                       ASN1_OCTET_STRING *hash)
 698 {
 699     if (!ossl_assert(certStatus != NULL))
 700         return 0;
 701     ASN1_OCTET_STRING_free(certStatus->certHash);
 702     certStatus->certHash = hash;
 703     return 1;
 704 }
 705
 706 /*
 707  * TODO: handle potential 2nd certificate when signing and encrypting
 708  * certificates have been requested/received
 709  */
 710 OSSL_CMP_MSG *ossl_cmp_certConf_new(OSSL_CMP_CTX *ctx, int fail_info,
 711                                     const char *text)
 712 {
 713     OSSL_CMP_MSG *msg = NULL;
 714     OSSL_CMP_CERTSTATUS *certStatus = NULL;
 715     ASN1_OCTET_STRING *certHash = NULL;
 716     OSSL_CMP_PKISI *sinfo;
 717
 718     if (!ossl_assert(ctx != NULL && ctx->newCert != NULL))
 719         return NULL;
 720
 721     if ((unsigned)fail_info > OSSL_CMP_PKIFAILUREINFO_MAX_BIT_PATTERN) {
 722         CMPerr(0, CMP_R_FAIL_INFO_OUT_OF_RANGE);
 723         return NULL;
 724     }
 725
 726     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_CERTCONF)) == NULL)
 727         goto err;
 728
 729     if ((certStatus = OSSL_CMP_CERTSTATUS_new()) == NULL)
 730         goto err;
 731     /* consume certStatus into msg right away so it gets deallocated with msg */
 732     if (!sk_OSSL_CMP_CERTSTATUS_push(msg->body->value.certConf, certStatus))
 733         goto err;
 734     /* set the ID of the certReq */
 735     if (!ASN1_INTEGER_set(certStatus->certReqId, OSSL_CMP_CERTREQID))
 736         goto err;
 737     /*
 738      * the hash of the certificate, using the same hash algorithm
 739      * as is used to create and verify the certificate signature
 740      */
 741     if ((certHash = X509_digest_sig(ctx->newCert)) == NULL)
 742         goto err;
 743
 744     if (!ossl_cmp_certstatus_set0_certHash(certStatus, certHash))
 745         goto err;
 746     certHash = NULL;
 747     /*
 748      * For any particular CertStatus, omission of the statusInfo field
 749      * indicates ACCEPTANCE of the specified certificate.  Alternatively,
 750      * explicit status details (with respect to acceptance or rejection) MAY
 751      * be provided in the statusInfo field, perhaps for auditing purposes at
 752      * the CA/RA.
 753      */
 754     sinfo = fail_info != 0 ?
 755         OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection, fail_info, text) :
 756         OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_accepted, 0, text);
 757     if (sinfo == NULL)
 758         goto err;
 759     certStatus->statusInfo = sinfo;
 760
 761     if (!ossl_cmp_msg_protect(ctx, msg))
 762         goto err;
 763
 764     return msg;
 765
 766  err:
 767     CMPerr(0, CMP_R_ERROR_CREATING_CERTCONF);
 768     OSSL_CMP_MSG_free(msg);
 769     ASN1_OCTET_STRING_free(certHash);
 770     return NULL;
 771 }
 772
 773 OSSL_CMP_MSG *ossl_cmp_pollReq_new(OSSL_CMP_CTX *ctx, int crid)
 774 {
 775     OSSL_CMP_MSG *msg = NULL;
 776     OSSL_CMP_POLLREQ *preq = NULL;
 777
 778     if (!ossl_assert(ctx != NULL))
 779         return NULL;
 780
 781     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_POLLREQ)) == NULL)
 782         goto err;
 783
 784     /* TODO: support multiple cert request IDs to poll */
 785     if ((preq = OSSL_CMP_POLLREQ_new()) == NULL
 786             || !ASN1_INTEGER_set(preq->certReqId, crid)
 787             || !sk_OSSL_CMP_POLLREQ_push(msg->body->value.pollReq, preq))
 788         goto err;
 789
 790     preq = NULL;
 791     if (!ossl_cmp_msg_protect(ctx, msg))
 792         goto err;
 793
 794     return msg;
 795
 796  err:
 797     CMPerr(0, CMP_R_ERROR_CREATING_POLLREQ);
 798     OSSL_CMP_POLLREQ_free(preq);
 799     OSSL_CMP_MSG_free(msg);
 800     return NULL;
 801 }
 802
 803 OSSL_CMP_MSG *ossl_cmp_pollRep_new(OSSL_CMP_CTX *ctx, int crid,
 804                                    int64_t poll_after)
 805 {
 806     OSSL_CMP_MSG *msg;
 807     OSSL_CMP_POLLREP *prep;
 808
 809     if (!ossl_assert(ctx != NULL))
 810         return NULL;
 811
 812     if ((msg = ossl_cmp_msg_create(ctx, OSSL_CMP_PKIBODY_POLLREP)) == NULL)
 813         goto err;
 814     if ((prep = OSSL_CMP_POLLREP_new()) == NULL)
 815         goto err;
 816     if (!sk_OSSL_CMP_POLLREP_push(msg->body->value.pollRep, prep))
 817         goto err;
 818     if (!ASN1_INTEGER_set(prep->certReqId, crid))
 819         goto err;
 820     if (!ASN1_INTEGER_set_int64(prep->checkAfter, poll_after))
 821         goto err;
 822
 823     if (!ossl_cmp_msg_protect(ctx, msg))
 824         goto err;
 825     return msg;
 826
 827  err:
 828     CMPerr(0, CMP_R_ERROR_CREATING_POLLREP);
 829     OSSL_CMP_MSG_free(msg);
 830     return NULL;
 831 }
 832
 833 /*-
 834  * returns the status field of the RevRepContent with the given
 835  * request/sequence id inside a revocation response.
 836  * RevRepContent has the revocation statuses in same order as they were sent in
 837  * RevReqContent.
 838  * returns NULL on error
 839  */
 840 OSSL_CMP_PKISI *
 841 ossl_cmp_revrepcontent_get_pkisi(OSSL_CMP_REVREPCONTENT *rrep, int rsid)
 842 {
 843     OSSL_CMP_PKISI *status;
 844
 845     if (!ossl_assert(rrep != NULL))
 846         return NULL;
 847
 848     if ((status = sk_OSSL_CMP_PKISI_value(rrep->status, rsid)) != NULL)
 849         return status;
 850
 851     CMPerr(0, CMP_R_PKISTATUSINFO_NOT_FOUND);
 852     return NULL;
 853 }
 854
 855 /*
 856  * returns the CertId field in the revCerts part of the RevRepContent
 857  * with the given request/sequence id inside a revocation response.
 858  * RevRepContent has the CertIds in same order as they were sent in
 859  * RevReqContent.
 860  * returns NULL on error
 861  */
 862 OSSL_CRMF_CERTID *
 863 ossl_cmp_revrepcontent_get_CertId(OSSL_CMP_REVREPCONTENT *rrep, int rsid)
 864 {
 865     OSSL_CRMF_CERTID *cid = NULL;
 866
 867     if (!ossl_assert(rrep != NULL))
 868         return NULL;
 869
 870     if ((cid = sk_OSSL_CRMF_CERTID_value(rrep->revCerts, rsid)) != NULL)
 871         return cid;
 872
 873     CMPerr(0, CMP_R_CERTID_NOT_FOUND);
 874     return NULL;
 875 }
 876
 877 static int suitable_rid(const ASN1_INTEGER *certReqId, int rid)
 878 {
 879     int trid;
 880
 881     if (rid == -1)
 882         return 1;
 883
 884     trid = ossl_cmp_asn1_get_int(certReqId);
 885
 886     if (trid == -1) {
 887         CMPerr(0, CMP_R_BAD_REQUEST_ID);
 888         return 0;
 889     }
 890     return rid == trid;
 891 }
 892
 893 static void add_expected_rid(int rid)
 894 {
 895     char str[DECIMAL_SIZE(rid) + 1];
 896
 897     BIO_snprintf(str, sizeof(str), "%d", rid);
 898     ERR_add_error_data(2, "expected certReqId = ", str);
 899 }
 900
 901 /*
 902  * returns a pointer to the PollResponse with the given CertReqId
 903  * (or the first one in case -1) inside a PollRepContent
 904  * returns NULL on error or if no suitable PollResponse available
 905  */
 906 OSSL_CMP_POLLREP *
 907 ossl_cmp_pollrepcontent_get0_pollrep(const OSSL_CMP_POLLREPCONTENT *prc,
 908                                      int rid)
 909 {
 910     OSSL_CMP_POLLREP *pollRep = NULL;
 911     int i;
 912
 913     if (!ossl_assert(prc != NULL))
 914         return NULL;
 915
 916     for (i = 0; i < sk_OSSL_CMP_POLLREP_num(prc); i++) {
 917         pollRep = sk_OSSL_CMP_POLLREP_value(prc, i);
 918         if (suitable_rid(pollRep->certReqId, rid))
 919             return pollRep;
 920     }
 921
 922     CMPerr(0, CMP_R_CERTRESPONSE_NOT_FOUND);
 923     add_expected_rid(rid);
 924     return NULL;
 925 }
 926
 927 /*
 928  * returns a pointer to the CertResponse with the given CertReqId
 929  * (or the first one in case -1) inside a CertRepMessage
 930  * returns NULL on error or if no suitable CertResponse available
 931  */
 932 OSSL_CMP_CERTRESPONSE *
 933 ossl_cmp_certrepmessage_get0_certresponse(const OSSL_CMP_CERTREPMESSAGE *crm,
 934                                           int rid)
 935 {
 936     OSSL_CMP_CERTRESPONSE *crep = NULL;
 937     int i;
 938
 939     if (!ossl_assert(crm != NULL && crm->response != NULL))
 940         return NULL;
 941
 942     for (i = 0; i < sk_OSSL_CMP_CERTRESPONSE_num(crm->response); i++) {
 943         crep = sk_OSSL_CMP_CERTRESPONSE_value(crm->response, i);
 944         if (suitable_rid(crep->certReqId, rid))
 945             return crep;
 946     }
 947
 948     CMPerr(0, CMP_R_CERTRESPONSE_NOT_FOUND);
 949     add_expected_rid(rid);
 950     return NULL;
 951 }
 952
 953 /*
 954  * CMP_CERTRESPONSE_get1_certificate() attempts to retrieve the returned
 955  * certificate from the given certResponse B<crep>.
 956  * Uses the privkey in case of indirect POP from B<ctx>.
 957  * Returns a pointer to a copy of the found certificate, or NULL if not found.
 958  */
 959 X509 *ossl_cmp_certresponse_get1_certificate(EVP_PKEY *privkey,
 960                                              const OSSL_CMP_CERTRESPONSE *crep)
 961 {
 962     OSSL_CMP_CERTORENCCERT *coec;
 963     X509 *crt = NULL;
 964
 965     if (!ossl_assert(crep != NULL))
 966         return NULL;
 967
 968     if (crep->certifiedKeyPair
 969             && (coec = crep->certifiedKeyPair->certOrEncCert) != NULL) {
 970         switch (coec->type) {
 971         case OSSL_CMP_CERTORENCCERT_CERTIFICATE:
 972             crt = X509_dup(coec->value.certificate);
 973             break;
 974         case OSSL_CMP_CERTORENCCERT_ENCRYPTEDCERT:
 975             /* cert encrypted for indirect PoP; RFC 4210, 5.2.8.2 */
 976             if (privkey == NULL) {
 977                 CMPerr(0, CMP_R_MISSING_PRIVATE_KEY);
 978                 return NULL;
 979             }
 980             crt =
 981                 OSSL_CRMF_ENCRYPTEDVALUE_get1_encCert(coec->value.encryptedCert,
 982                                                       privkey);
 983             break;
 984         default:
 985             CMPerr(0, CMP_R_UNKNOWN_CERT_TYPE);
 986             return NULL;
 987         }
 988     }
 989     if (crt == NULL)
 990         CMPerr(0, CMP_R_CERTIFICATE_NOT_FOUND);
 991     return crt;
 992 }
 993
 994 int OSSL_CMP_MSG_update_transactionID(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg)
 995 {
 996     if (ctx == NULL || msg == NULL) {
 997         CMPerr(0, CMP_R_NULL_ARGUMENT);
 998         return 0;
 999     }
1000     if (!ossl_cmp_hdr_set_transactionID(ctx, msg->header))
1001         return 0;
1002     return msg->header->protectionAlg == NULL
1003             || ossl_cmp_msg_protect(ctx, msg);
1004 }
1005
1006 OSSL_CMP_MSG *ossl_cmp_msg_load(const char *file)
1007 {
1008     OSSL_CMP_MSG *msg = NULL;
1009     BIO *bio = NULL;
1010
1011     if (!ossl_assert(file != NULL))
1012         return NULL;
1013
1014     if ((bio = BIO_new_file(file, "rb")) == NULL)
1015         return NULL;
1016     msg = d2i_OSSL_CMP_MSG_bio(bio, NULL);
1017     BIO_free(bio);
1018     return msg;
1019 }
1020
1021 OSSL_CMP_MSG *d2i_OSSL_CMP_MSG_bio(BIO *bio, OSSL_CMP_MSG **msg)
1022 {
1023     return ASN1_d2i_bio_of(OSSL_CMP_MSG, OSSL_CMP_MSG_new,
1024                            d2i_OSSL_CMP_MSG, bio, msg);
1025 }
1026
1027 int i2d_OSSL_CMP_MSG_bio(BIO *bio, const OSSL_CMP_MSG *msg)
1028 {
1029     return ASN1_i2d_bio_of(OSSL_CMP_MSG, i2d_OSSL_CMP_MSG, bio, msg);
1030 }