crypto/cmp/cmp_client.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 #include "cmp_local.h"
  13 #include "internal/cryptlib.h"
  14
  15 /* explicit #includes not strictly needed since implied by the above: */
  16 #include <openssl/bio.h>
  17 #include <openssl/cmp.h>
  18 #include <openssl/err.h>
  19 #include <openssl/evp.h>
  20 #include <openssl/x509v3.h>
  21
  22 #include "openssl/cmp_util.h"
  23
  24 DEFINE_STACK_OF(ASN1_UTF8STRING)
  25 DEFINE_STACK_OF(X509)
  26 DEFINE_STACK_OF(X509_CRL)
  27 DEFINE_STACK_OF(OSSL_CMP_CERTRESPONSE)
  28 DEFINE_STACK_OF(OSSL_CMP_PKISI)
  29 DEFINE_STACK_OF(OSSL_CRMF_CERTID)
  30
  31 #define IS_CREP(t) ((t) == OSSL_CMP_PKIBODY_IP || (t) == OSSL_CMP_PKIBODY_CP \
  32                         || (t) == OSSL_CMP_PKIBODY_KUP)
  33
  34 /*-
  35  * Evaluate whether there's an exception (violating the standard) configured for
  36  * handling negative responses without protection or with invalid protection.
  37  * Returns 1 on acceptance, 0 on rejection, or -1 on (internal) error.
  38  */
  39 static int unprotected_exception(const OSSL_CMP_CTX *ctx,
  40                                  const OSSL_CMP_MSG *rep,
  41                                  int invalid_protection,
  42                                  int expected_type /* ignored here */)
  43 {
  44     int rcvd_type = ossl_cmp_msg_get_bodytype(rep /* may be NULL */);
  45     const char *msg_type = NULL;
  46
  47     if (!ossl_assert(ctx != NULL && rep != NULL))
  48         return -1;
  49
  50     if (!ctx->unprotectedErrors)
  51         return 0;
  52
  53     switch (rcvd_type) {
  54     case OSSL_CMP_PKIBODY_ERROR:
  55         msg_type = "error response";
  56         break;
  57     case OSSL_CMP_PKIBODY_RP:
  58         {
  59             OSSL_CMP_PKISI *si =
  60                 ossl_cmp_revrepcontent_get_pkisi(rep->body->value.rp,
  61                                                  OSSL_CMP_REVREQSID);
  62
  63             if (si == NULL)
  64                 return -1;
  65             if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_rejection)
  66                 msg_type = "revocation response message with rejection status";
  67             break;
  68         }
  69     case OSSL_CMP_PKIBODY_PKICONF:
  70         msg_type = "PKI Confirmation message";
  71         break;
  72     default:
  73         if (IS_CREP(rcvd_type)) {
  74             OSSL_CMP_CERTREPMESSAGE *crepmsg = rep->body->value.ip;
  75             OSSL_CMP_CERTRESPONSE *crep =
  76                 ossl_cmp_certrepmessage_get0_certresponse(crepmsg,
  77                                                           -1 /* any rid */);
  78
  79             if (sk_OSSL_CMP_CERTRESPONSE_num(crepmsg->response) > 1)
  80                 return -1;
  81             /* TODO: handle potentially multiple CertResponses in CertRepMsg */
  82             if (crep == NULL)
  83                 return -1;
  84             if (ossl_cmp_pkisi_get_status(crep->status)
  85                 == OSSL_CMP_PKISTATUS_rejection)
  86                 msg_type = "CertRepMessage with rejection status";
  87         }
  88     }
  89     if (msg_type == NULL)
  90         return 0;
  91     ossl_cmp_log2(WARN, ctx, "ignoring %s protection of %s",
  92                   invalid_protection ? "invalid" : "missing", msg_type);
  93     return 1;
  94 }
  95
  96
  97 /* Save error info from PKIStatusInfo field of a certresponse into ctx */
  98 static int save_statusInfo(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si)
  99 {
 100     int i;
 101     OSSL_CMP_PKIFREETEXT *ss;
 102
 103     if (!ossl_assert(ctx != NULL && si != NULL))
 104         return 0;
 105
 106     if ((ctx->status = ossl_cmp_pkisi_get_status(si)) < 0)
 107         return 0;
 108
 109     ctx->failInfoCode = 0;
 110     if (si->failInfo != NULL) {
 111         for (i = 0; i <= OSSL_CMP_PKIFAILUREINFO_MAX; i++) {
 112             if (ASN1_BIT_STRING_get_bit(si->failInfo, i))
 113                 ctx->failInfoCode |= (1 << i);
 114         }
 115     }
 116
 117     if (!ossl_cmp_ctx_set0_statusString(ctx, sk_ASN1_UTF8STRING_new_null())
 118             || (ctx->statusString == NULL))
 119         return 0;
 120
 121     ss = si->statusString; /* may be NULL */
 122     for (i = 0; i < sk_ASN1_UTF8STRING_num(ss); i++) {
 123         ASN1_UTF8STRING *str = sk_ASN1_UTF8STRING_value(ss, i);
 124
 125         if (!sk_ASN1_UTF8STRING_push(ctx->statusString, ASN1_STRING_dup(str)))
 126             return 0;
 127     }
 128     return 1;
 129 }
 130
 131 /*-
 132  * Perform the generic aspects of sending a request and receiving a response.
 133  * Returns 1 on success and provides the received PKIMESSAGE in *rep.
 134  * Returns 0 on error.
 135  * Regardless of success, caller is responsible for freeing *rep (unless NULL).
 136  */
 137 static int send_receive_check(OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *req,
 138                               OSSL_CMP_MSG **rep, int expected_type)
 139 {
 140     const char *req_type_str =
 141         ossl_cmp_bodytype_to_string(ossl_cmp_msg_get_bodytype(req));
 142     const char *expected_type_str = ossl_cmp_bodytype_to_string(expected_type);
 143     int msg_timeout;
 144     int bt;
 145     time_t now = time(NULL);
 146     int time_left;
 147     OSSL_CMP_transfer_cb_t transfer_cb = ctx->transfer_cb;
 148
 149     if (transfer_cb == NULL)
 150         transfer_cb = OSSL_CMP_MSG_http_perform;
 151
 152     *rep = NULL;
 153     msg_timeout = ctx->msg_timeout; /* backup original value */
 154     if ((IS_CREP(expected_type) || expected_type == OSSL_CMP_PKIBODY_POLLREP)
 155             && ctx->total_timeout > 0 /* timeout is not infinite */) {
 156         if (now >= ctx->end_time) {
 157             CMPerr(0, CMP_R_TOTAL_TIMEOUT);
 158             return 0;
 159         }
 160         if (!ossl_assert(ctx->end_time - time(NULL) < INT_MAX)) {
 161             /* cannot really happen due to the assignment in do_certreq_seq() */
 162             CMPerr(0, CMP_R_INVALID_ARGS);
 163             return 0;
 164         }
 165         time_left = (int)(ctx->end_time - now);
 166         if (ctx->msg_timeout == 0 || time_left < ctx->msg_timeout)
 167             ctx->msg_timeout = time_left;
 168     }
 169
 170     /* should print error queue since transfer_cb may call ERR_clear_error() */
 171     OSSL_CMP_CTX_print_errors(ctx);
 172
 173     ossl_cmp_log1(INFO, ctx, "sending %s", req_type_str);
 174
 175     *rep = (*transfer_cb)(ctx, req);
 176     ctx->msg_timeout = msg_timeout; /* restore original value */
 177
 178     if (*rep == NULL) {
 179         CMPerr(0, CMP_R_TRANSFER_ERROR); /* or receiving response */
 180         ERR_add_error_data(2, "request sent: ", req_type_str);
 181         ERR_add_error_data(2, ", expected response: ", expected_type_str);
 182         return 0;
 183     }
 184
 185     bt = ossl_cmp_msg_get_bodytype(*rep);
 186     /*
 187      * The body type in the 'bt' variable is not yet verified.
 188      * Still we use this preliminary value already for a progress report because
 189      * the following msg verification may also produce log entries and may fail.
 190      */
 191     ossl_cmp_log1(INFO, ctx, "received %s", ossl_cmp_bodytype_to_string(bt));
 192
 193     if (!ossl_cmp_msg_check_update(ctx, *rep, unprotected_exception,
 194                                    expected_type))
 195         return 0;
 196
 197     if (bt == expected_type
 198         /* as an answer to polling, there could be IP/CP/KUP: */
 199             || (IS_CREP(bt) && expected_type == OSSL_CMP_PKIBODY_POLLREP))
 200         return 1;
 201
 202     /* received message type is not one of the expected ones (e.g., error) */
 203     CMPerr(0, bt == OSSL_CMP_PKIBODY_ERROR ? CMP_R_RECEIVED_ERROR :
 204            CMP_R_UNEXPECTED_PKIBODY); /* in next line for mkerr.pl */
 205
 206     if (bt != OSSL_CMP_PKIBODY_ERROR) {
 207         ERR_add_error_data(3, "message type is '",
 208                            ossl_cmp_bodytype_to_string(bt), "'");
 209     } else {
 210         OSSL_CMP_ERRORMSGCONTENT *emc = (*rep)->body->value.error;
 211         OSSL_CMP_PKISI *si = emc->pKIStatusInfo;
 212         char buf[OSSL_CMP_PKISI_BUFLEN];
 213
 214         if (save_statusInfo(ctx, si)
 215                 && OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf,
 216                                                   sizeof(buf)) != NULL)
 217             ERR_add_error_data(1, buf);
 218         if (emc->errorCode != NULL
 219                 && BIO_snprintf(buf, sizeof(buf), "; errorCode: %ld",
 220                                 ASN1_INTEGER_get(emc->errorCode)) > 0)
 221             ERR_add_error_data(1, buf);
 222         if (emc->errorDetails != NULL) {
 223             char *text = sk_ASN1_UTF8STRING2text(emc->errorDetails, ", ",
 224                                                  OSSL_CMP_PKISI_BUFLEN - 1);
 225
 226             if (text != NULL)
 227                 ERR_add_error_data(2, "; errorDetails: ", text);
 228             OPENSSL_free(text);
 229         }
 230         if (ctx->status != OSSL_CMP_PKISTATUS_rejection) {
 231             CMPerr(0, CMP_R_UNEXPECTED_PKISTATUS);
 232             if (ctx->status == OSSL_CMP_PKISTATUS_waiting)
 233                 ctx->status = OSSL_CMP_PKISTATUS_rejection;
 234         }
 235     }
 236     return 0;
 237 }
 238
 239 /*-
 240  * When a 'waiting' PKIStatus has been received, this function is used to
 241  * poll, which should yield a pollRep or finally a CertRepMessage in ip/cp/kup.
 242  * On receiving a pollRep, which includes a checkAfter value, it return this
 243  * value if sleep == 0, else it sleeps as long as indicated and retries.
 244  *
 245  * A transaction timeout is enabled if ctx->total_timeout is > 0.
 246  * In this case polling will continue until the timeout is reached and then
 247  * polling is done a last time even if this is before the "checkAfter" time.
 248  *
 249  * Returns -1 on receiving pollRep if sleep == 0, setting the checkAfter value.
 250  * Returns 1 on success and provides the received PKIMESSAGE in *rep.
 251  *           In this case the caller is responsible for freeing *rep.
 252  * Returns 0 on error (which includes the case that timeout has been reached).
 253  */
 254 static int poll_for_response(OSSL_CMP_CTX *ctx, int sleep, int rid,
 255                              OSSL_CMP_MSG **rep, int *checkAfter)
 256 {
 257     OSSL_CMP_MSG *preq = NULL;
 258     OSSL_CMP_MSG *prep = NULL;
 259
 260     ossl_cmp_info(ctx,
 261                   "received 'waiting' PKIStatus, starting to poll for response");
 262     *rep = NULL;
 263     for (;;) {
 264         /* TODO: handle potentially multiple poll requests per message */
 265         if ((preq = ossl_cmp_pollReq_new(ctx, rid)) == NULL)
 266             goto err;
 267
 268         if (!send_receive_check(ctx, preq, &prep, OSSL_CMP_PKIBODY_POLLREP))
 269             goto err;
 270
 271         /* handle potential pollRep */
 272         if (ossl_cmp_msg_get_bodytype(prep) == OSSL_CMP_PKIBODY_POLLREP) {
 273             OSSL_CMP_POLLREPCONTENT *prc = prep->body->value.pollRep;
 274             OSSL_CMP_POLLREP *pollRep = NULL;
 275             int64_t check_after;
 276             char str[OSSL_CMP_PKISI_BUFLEN];
 277             int len;
 278
 279             /* TODO: handle potentially multiple elements in pollRep */
 280             if (sk_OSSL_CMP_POLLREP_num(prc) > 1) {
 281                 CMPerr(0, CMP_R_MULTIPLE_RESPONSES_NOT_SUPPORTED);
 282                 goto err;
 283             }
 284             pollRep = ossl_cmp_pollrepcontent_get0_pollrep(prc, rid);
 285             if (pollRep == NULL)
 286                 goto err;
 287
 288             if (!ASN1_INTEGER_get_int64(&check_after, pollRep->checkAfter)) {
 289                 CMPerr(0, CMP_R_BAD_CHECKAFTER_IN_POLLREP);
 290                 goto err;
 291             }
 292             if (check_after < 0 || (uint64_t)check_after
 293                 > (sleep ? ULONG_MAX / 1000 : INT_MAX)) {
 294                 CMPerr(0, CMP_R_CHECKAFTER_OUT_OF_RANGE);
 295                 if (BIO_snprintf(str, OSSL_CMP_PKISI_BUFLEN, "value = %jd",
 296                                  check_after) >= 0)
 297                     ERR_add_error_data(1, str);
 298                 goto err;
 299             }
 300             if (ctx->total_timeout > 0) { /* timeout is not infinite */
 301                 const int exp = 5; /* expected max time per msg round trip */
 302                 int64_t time_left = (int64_t)(ctx->end_time - exp - time(NULL));
 303
 304                 if (time_left <= 0) {
 305                     CMPerr(0, CMP_R_TOTAL_TIMEOUT);
 306                     goto err;
 307                 }
 308                 if (time_left < check_after)
 309                     check_after = time_left;
 310                 /* poll one last time just when timeout was reached */
 311             }
 312
 313             if (pollRep->reason == NULL
 314                     || (len = BIO_snprintf(str, OSSL_CMP_PKISI_BUFLEN,
 315                                            " with reason = '")) < 0) {
 316                 *str = '\0';
 317             } else {
 318                 char *text = sk_ASN1_UTF8STRING2text(pollRep->reason, ", ",
 319                                                      sizeof(str) - len - 2);
 320
 321                 if (text == NULL
 322                         || BIO_snprintf(str + len, sizeof(str) - len,
 323                                         "%s'", text) < 0)
 324                     *str = '\0';
 325                 OPENSSL_free(text);
 326             }
 327             ossl_cmp_log2(INFO, ctx,
 328                           "received polling response%s; checkAfter = %ld seconds",
 329                           str, check_after);
 330
 331             OSSL_CMP_MSG_free(preq);
 332             preq = NULL;
 333             OSSL_CMP_MSG_free(prep);
 334             prep = NULL;
 335             if (sleep) {
 336                 ossl_sleep((unsigned long)(1000 * check_after));
 337             } else {
 338                 if (checkAfter != NULL)
 339                     *checkAfter = (int)check_after;
 340                 return -1; /* exits the loop */
 341             }
 342         } else {
 343             ossl_cmp_info(ctx, "received ip/cp/kup after polling");
 344             /* any other body type has been rejected by send_receive_check() */
 345             break;
 346         }
 347     }
 348     if (prep == NULL)
 349         goto err;
 350
 351     OSSL_CMP_MSG_free(preq);
 352     *rep = prep;
 353
 354     return 1;
 355  err:
 356     OSSL_CMP_MSG_free(preq);
 357     OSSL_CMP_MSG_free(prep);
 358     return 0;
 359 }
 360
 361 /* Send certConf for IR, CR or KUR sequences and check response */
 362 int ossl_cmp_exchange_certConf(OSSL_CMP_CTX *ctx, int fail_info,
 363                                const char *txt)
 364 {
 365     OSSL_CMP_MSG *certConf;
 366     OSSL_CMP_MSG *PKIconf = NULL;
 367     int res = 0;
 368
 369     /* OSSL_CMP_certConf_new() also checks if all necessary options are set */
 370     if ((certConf = ossl_cmp_certConf_new(ctx, fail_info, txt)) == NULL)
 371         goto err;
 372
 373     res = send_receive_check(ctx, certConf, &PKIconf, OSSL_CMP_PKIBODY_PKICONF);
 374
 375  err:
 376     OSSL_CMP_MSG_free(certConf);
 377     OSSL_CMP_MSG_free(PKIconf);
 378     return res;
 379 }
 380
 381 /* Send given error and check response */
 382 int ossl_cmp_exchange_error(OSSL_CMP_CTX *ctx, int status, int fail_info,
 383                             const char *txt, int errorCode, const char *details)
 384 {
 385     OSSL_CMP_MSG *error = NULL;
 386     OSSL_CMP_PKISI *si = NULL;
 387     OSSL_CMP_MSG *PKIconf = NULL;
 388     int res = 0;
 389
 390     if ((si = OSSL_CMP_STATUSINFO_new(status, fail_info, txt)) == NULL)
 391         goto err;
 392     /* ossl_cmp_error_new() also checks if all necessary options are set */
 393     if ((error = ossl_cmp_error_new(ctx, si, errorCode, details, 0)) == NULL)
 394         goto err;
 395
 396     res = send_receive_check(ctx, error, &PKIconf, OSSL_CMP_PKIBODY_PKICONF);
 397
 398  err:
 399     OSSL_CMP_MSG_free(error);
 400     OSSL_CMP_PKISI_free(si);
 401     OSSL_CMP_MSG_free(PKIconf);
 402     return res;
 403 }
 404
 405 /*-
 406  * Retrieve a copy of the certificate, if any, from the given CertResponse.
 407  * Take into account PKIStatusInfo of CertResponse in ctx, report it on error.
 408  * Returns NULL if not found or on error.
 409  */
 410 static X509 *get1_cert_status(OSSL_CMP_CTX *ctx, int bodytype,
 411                               OSSL_CMP_CERTRESPONSE *crep)
 412 {
 413     char buf[OSSL_CMP_PKISI_BUFLEN];
 414     X509 *crt = NULL;
 415     EVP_PKEY *privkey;
 416
 417     if (!ossl_assert(ctx != NULL && crep != NULL))
 418         return NULL;
 419
 420     privkey = OSSL_CMP_CTX_get0_newPkey(ctx, 1);
 421     switch (ossl_cmp_pkisi_get_status(crep->status)) {
 422     case OSSL_CMP_PKISTATUS_waiting:
 423         ossl_cmp_err(ctx,
 424                      "received \"waiting\" status for cert when actually aiming to extract cert");
 425         CMPerr(0, CMP_R_ENCOUNTERED_WAITING);
 426         goto err;
 427     case OSSL_CMP_PKISTATUS_grantedWithMods:
 428         ossl_cmp_warn(ctx, "received \"grantedWithMods\" for certificate");
 429         break;
 430     case OSSL_CMP_PKISTATUS_accepted:
 431         break;
 432         /* get all information in case of a rejection before going to error */
 433     case OSSL_CMP_PKISTATUS_rejection:
 434         ossl_cmp_err(ctx, "received \"rejection\" status rather than cert");
 435         CMPerr(0, CMP_R_REQUEST_REJECTED_BY_SERVER);
 436         goto err;
 437     case OSSL_CMP_PKISTATUS_revocationWarning:
 438         ossl_cmp_warn(ctx,
 439                       "received \"revocationWarning\" - a revocation of the cert is imminent");
 440         break;
 441     case OSSL_CMP_PKISTATUS_revocationNotification:
 442         ossl_cmp_warn(ctx,
 443                       "received \"revocationNotification\" - a revocation of the cert has occurred");
 444         break;
 445     case OSSL_CMP_PKISTATUS_keyUpdateWarning:
 446         if (bodytype != OSSL_CMP_PKIBODY_KUR) {
 447             CMPerr(0, CMP_R_ENCOUNTERED_KEYUPDATEWARNING);
 448             goto err;
 449         }
 450         break;
 451     default:
 452         ossl_cmp_log1(ERROR, ctx,
 453                       "received unsupported PKIStatus %d for certificate",
 454                       ctx->status);
 455         CMPerr(0, CMP_R_UNKNOWN_PKISTATUS);
 456         goto err;
 457     }
 458     crt = ossl_cmp_certresponse_get1_cert(crep, ctx, privkey);
 459     if (crt == NULL) /* according to PKIStatus, we can expect a cert */
 460         CMPerr(0, CMP_R_CERTIFICATE_NOT_FOUND);
 461
 462     return crt;
 463
 464  err:
 465     if (OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf, sizeof(buf)) != NULL)
 466         ERR_add_error_data(1, buf);
 467     return NULL;
 468 }
 469
 470 /*-
 471  * Callback fn validating that the new certificate can be verified, using
 472  * ctx->certConf_cb_arg, which has been initialized using opt_out_trusted, and
 473  * ctx->untrusted, which at this point already contains ctx->extraCertsIn.
 474  * Returns 0 on acceptance, else a bit field reflecting PKIFailureInfo.
 475  * Quoting from RFC 4210 section 5.1. Overall PKI Message:
 476  *     The extraCerts field can contain certificates that may be useful to
 477  *     the recipient.  For example, this can be used by a CA or RA to
 478  *     present an end entity with certificates that it needs to verify its
 479  *     own new certificate (if, for example, the CA that issued the end
 480  *     entity's certificate is not a root CA for the end entity).  Note that
 481  *     this field does not necessarily contain a certification path; the
 482  *     recipient may have to sort, select from, or otherwise process the
 483  *     extra certificates in order to use them.
 484  * Note: While often handy, there is no hard requirement by CMP that
 485  * an EE must be able to validate the certificates it gets enrolled.
 486  */
 487 int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,
 488                          const char **text)
 489 {
 490     X509_STORE *out_trusted = OSSL_CMP_CTX_get_certConf_cb_arg(ctx);
 491     STACK_OF(X509) *chain = NULL;
 492     (void)text; /* make (artificial) use of var to prevent compiler warning */
 493
 494     if (fail_info != 0) /* accept any error flagged by CMP core library */
 495         return fail_info;
 496
 497     ossl_cmp_debug(ctx, "trying to build chain for newly enrolled cert");
 498     chain = ossl_cmp_build_cert_chain(ctx->libctx, ctx->propq,
 499                                       out_trusted /* may be NULL */,
 500                                       ctx->untrusted, cert);
 501     if (sk_X509_num(chain) > 0)
 502         X509_free(sk_X509_shift(chain)); /* remove leaf (EE) cert */
 503     if (out_trusted != NULL) {
 504         if (chain == NULL) {
 505             ossl_cmp_err(ctx, "failed building chain for newly enrolled cert");
 506             fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_incorrectData;
 507         } else {
 508             ossl_cmp_debug(ctx,
 509                            "succeeded building proper chain for newly enrolled cert");
 510         }
 511     } else if (chain == NULL) {
 512         ossl_cmp_warn(ctx, "could not build approximate chain for newly enrolled cert, resorting to received extraCerts");
 513         chain = OSSL_CMP_CTX_get1_extraCertsIn(ctx);
 514     } else {
 515         ossl_cmp_debug(ctx,
 516                        "success building approximate chain for newly enrolled cert");
 517     }
 518     (void)ossl_cmp_ctx_set1_newChain(ctx, chain);
 519     sk_X509_pop_free(chain, X509_free);
 520
 521     return fail_info;
 522 }
 523
 524 /*-
 525  * Perform the generic handling of certificate responses for IR/CR/KUR/P10CR.
 526  * Returns -1 on receiving pollRep if sleep == 0, setting the checkAfter value.
 527  * Returns 1 on success and provides the received PKIMESSAGE in *resp.
 528  * Returns 0 on error (which includes the case that timeout has been reached).
 529  * Regardless of success, caller is responsible for freeing *resp (unless NULL).
 530  */
 531 static int cert_response(OSSL_CMP_CTX *ctx, int sleep, int rid,
 532                          OSSL_CMP_MSG **resp, int *checkAfter,
 533                          int req_type, int expected_type)
 534 {
 535     EVP_PKEY *rkey = OSSL_CMP_CTX_get0_newPkey(ctx /* may be NULL */, 0);
 536     int fail_info = 0; /* no failure */
 537     const char *txt = NULL;
 538     OSSL_CMP_CERTREPMESSAGE *crepmsg;
 539     OSSL_CMP_CERTRESPONSE *crep;
 540     OSSL_CMP_certConf_cb_t cb;
 541     X509 *cert;
 542     char *subj = NULL;
 543     int ret = 1;
 544
 545     if (!ossl_assert(ctx != NULL))
 546         return 0;
 547
 548  retry:
 549     crepmsg = (*resp)->body->value.ip; /* same for cp and kup */
 550     if (sk_OSSL_CMP_CERTRESPONSE_num(crepmsg->response) > 1) {
 551         CMPerr(0, CMP_R_MULTIPLE_RESPONSES_NOT_SUPPORTED);
 552         return 0;
 553     }
 554     /* TODO: handle potentially multiple CertResponses in CertRepMsg */
 555     crep = ossl_cmp_certrepmessage_get0_certresponse(crepmsg, rid);
 556     if (crep == NULL)
 557         return 0;
 558     if (!save_statusInfo(ctx, crep->status))
 559         return 0;
 560     if (rid == -1) {
 561         /* for OSSL_CMP_PKIBODY_P10CR learn CertReqId from response */
 562         rid = ossl_cmp_asn1_get_int(crep->certReqId);
 563         if (rid == -1) {
 564             CMPerr(0, CMP_R_BAD_REQUEST_ID);
 565             return 0;
 566         }
 567     }
 568
 569     if (ossl_cmp_pkisi_get_status(crep->status) == OSSL_CMP_PKISTATUS_waiting) {
 570         OSSL_CMP_MSG_free(*resp);
 571         *resp = NULL;
 572         if ((ret = poll_for_response(ctx, sleep, rid, resp, checkAfter)) != 0) {
 573             if (ret == -1) /* at this point implies sleep == 0 */
 574                 return ret; /* waiting */
 575             goto retry; /* got ip/cp/kup, which may still indicate 'waiting' */
 576         } else {
 577             CMPerr(0, CMP_R_POLLING_FAILED);
 578             return 0;
 579         }
 580     }
 581
 582     cert = get1_cert_status(ctx, (*resp)->body->type, crep);
 583     if (cert == NULL) {
 584         ERR_add_error_data(1, "; cannot extract certificate from response");
 585         return 0;
 586     }
 587     if (!ossl_cmp_ctx_set0_newCert(ctx, cert))
 588         return 0;
 589
 590     /*
 591      * if the CMP server returned certificates in the caPubs field, copy them
 592      * to the context so that they can be retrieved if necessary
 593      */
 594     if (crepmsg->caPubs != NULL
 595             && !ossl_cmp_ctx_set1_caPubs(ctx, crepmsg->caPubs))
 596         return 0;
 597
 598     /* copy received extraCerts to ctx->extraCertsIn so they can be retrieved */
 599     if (!ossl_cmp_ctx_set1_extraCertsIn(ctx, (*resp)->extraCerts))
 600         return 0;
 601
 602     subj = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0);
 603     if (rkey != NULL
 604         /* X509_check_private_key() also works if rkey is just public key */
 605             && !(X509_check_private_key(ctx->newCert, rkey))) {
 606         fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_incorrectData;
 607         txt = "public key in new certificate does not match our enrollment key";
 608         /*-
 609          * not callling (void)ossl_cmp_exchange_error(ctx,
 610          *                    OSSL_CMP_PKISTATUS_rejection, fail_info, txt)
 611          * not throwing CMP_R_CERTIFICATE_NOT_ACCEPTED with txt
 612          * not returning 0
 613          * since we better leave this for the certConf_cb to decide
 614          */
 615     }
 616
 617     /*
 618      * Execute the certification checking callback function,
 619      * which can determine whether to accept a newly enrolled certificate.
 620      * It may overrule the pre-decision reflected in 'fail_info' and '*txt'.
 621      */
 622     cb = ctx->certConf_cb != NULL ? ctx->certConf_cb : OSSL_CMP_certConf_cb;
 623     if ((fail_info = cb(ctx, ctx->newCert, fail_info, &txt)) != 0
 624             && txt == NULL)
 625         txt = "CMP client did not accept it";
 626     if (fail_info != 0) /* immediately log error before any certConf exchange */
 627         ossl_cmp_log1(ERROR, ctx,
 628                       "rejecting newly enrolled cert with subject: %s", subj);
 629
 630     /*
 631      * TODO: better move certConf exchange to do_certreq_seq() such that
 632      * also more low-level errors with CertReqMessages get reported to server
 633      */
 634     if (!ctx->disableConfirm
 635             && !ossl_cmp_hdr_has_implicitConfirm((*resp)->header)) {
 636         if (!ossl_cmp_exchange_certConf(ctx, fail_info, txt))
 637             ret = 0;
 638     }
 639
 640     /* not throwing failure earlier as transfer_cb may call ERR_clear_error() */
 641     if (fail_info != 0) {
 642         CMPerr(0, CMP_R_CERTIFICATE_NOT_ACCEPTED);
 643         ERR_add_error_data(2, "rejecting newly enrolled cert with subject: ",
 644                            subj);
 645         if (txt != NULL)
 646             ERR_add_error_txt("; ", txt);
 647         ret = 0;
 648     }
 649     OPENSSL_free(subj);
 650     return ret;
 651 }
 652
 653 int OSSL_CMP_try_certreq(OSSL_CMP_CTX *ctx, int req_type,
 654                          const OSSL_CRMF_MSG *crm, int *checkAfter)
 655 {
 656     OSSL_CMP_MSG *req = NULL;
 657     OSSL_CMP_MSG *rep = NULL;
 658     int is_p10 = req_type == OSSL_CMP_PKIBODY_P10CR;
 659     int rid = is_p10 ? -1 : OSSL_CMP_CERTREQID;
 660     int rep_type = is_p10 ? OSSL_CMP_PKIBODY_CP : req_type + 1;
 661     int res = 0;
 662
 663     if (ctx == NULL) {
 664         CMPerr(0, CMP_R_NULL_ARGUMENT);
 665         return 0;
 666     }
 667
 668     if (ctx->status != OSSL_CMP_PKISTATUS_waiting) { /* not polling already */
 669         ctx->status = -1;
 670         if (!ossl_cmp_ctx_set0_newCert(ctx, NULL))
 671             return 0;
 672
 673         if (ctx->total_timeout > 0) /* else ctx->end_time is not used */
 674             ctx->end_time = time(NULL) + ctx->total_timeout;
 675
 676         req = ossl_cmp_certreq_new(ctx, req_type, crm);
 677         if (req == NULL) /* also checks if all necessary options are set */
 678             return 0;
 679
 680         if (!send_receive_check(ctx, req, &rep, rep_type))
 681             goto err;
 682     } else {
 683         if (req_type < 0)
 684             return ossl_cmp_exchange_error(ctx, OSSL_CMP_PKISTATUS_rejection,
 685                                            0 /* TODO better fail_info value? */,
 686                                            "polling aborted", 0 /* errorCode */,
 687                                            "by application");
 688         res = poll_for_response(ctx, 0 /* no sleep */, rid, &rep, checkAfter);
 689         if (res <= 0) /* waiting or error */
 690             return res;
 691     }
 692     res = cert_response(ctx, 0 /* no sleep */, rid, &rep, checkAfter,
 693                         req_type, rep_type);
 694
 695  err:
 696     OSSL_CMP_MSG_free(req);
 697     OSSL_CMP_MSG_free(rep);
 698     return res;
 699 }
 700
 701 /*-
 702  * Do the full sequence CR/IR/KUR/P10CR, CP/IP/KUP/CP,
 703  * certConf, PKIconf, and polling if required.
 704  * Will sleep as long as indicated by the server (according to checkAfter).
 705  * All enrollment options need to be present in the context.
 706  * TODO: another function to request two certificates at once should be created.
 707  * Returns pointer to received certificate, or NULL if none was received.
 708  */
 709 X509 *OSSL_CMP_exec_certreq(OSSL_CMP_CTX *ctx, int req_type,
 710                             const OSSL_CRMF_MSG *crm)
 711 {
 712
 713     OSSL_CMP_MSG *req = NULL;
 714     OSSL_CMP_MSG *rep = NULL;
 715     int is_p10 = req_type == OSSL_CMP_PKIBODY_P10CR;
 716     int rid = is_p10 ? -1 : OSSL_CMP_CERTREQID;
 717     int rep_type = is_p10 ? OSSL_CMP_PKIBODY_CP : req_type + 1;
 718     X509 *result = NULL;
 719
 720     if (ctx == NULL) {
 721         CMPerr(0, CMP_R_NULL_ARGUMENT);
 722         return NULL;
 723     }
 724     if (is_p10 && crm != NULL) {
 725         CMPerr(0, CMP_R_INVALID_ARGS);
 726         return NULL;
 727     }
 728
 729     ctx->status = -1;
 730     if (!ossl_cmp_ctx_set0_newCert(ctx, NULL))
 731         return NULL;
 732
 733     if (ctx->total_timeout > 0) /* else ctx->end_time is not used */
 734         ctx->end_time = time(NULL) + ctx->total_timeout;
 735
 736     /* OSSL_CMP_certreq_new() also checks if all necessary options are set */
 737     if ((req = ossl_cmp_certreq_new(ctx, req_type, crm)) == NULL)
 738         goto err;
 739
 740     if (!send_receive_check(ctx, req, &rep, rep_type))
 741         goto err;
 742
 743     if (cert_response(ctx, 1 /* sleep */, rid, &rep, NULL, req_type, rep_type)
 744         <= 0)
 745         goto err;
 746
 747     result = ctx->newCert;
 748  err:
 749     OSSL_CMP_MSG_free(req);
 750     OSSL_CMP_MSG_free(rep);
 751     return result;
 752 }
 753
 754 X509 *OSSL_CMP_exec_RR_ses(OSSL_CMP_CTX *ctx)
 755 {
 756     OSSL_CMP_MSG *rr = NULL;
 757     OSSL_CMP_MSG *rp = NULL;
 758     const int num_RevDetails = 1;
 759     const int rsid = OSSL_CMP_REVREQSID;
 760     OSSL_CMP_REVREPCONTENT *rrep = NULL;
 761     OSSL_CMP_PKISI *si = NULL;
 762     char buf[OSSL_CMP_PKISI_BUFLEN];
 763     X509 *result = NULL;
 764
 765     if (ctx == NULL) {
 766         CMPerr(0, CMP_R_INVALID_ARGS);
 767         return 0;
 768     }
 769     if (ctx->oldCert == NULL) {
 770         CMPerr(0, CMP_R_MISSING_REFERENCE_CERT);
 771         return 0;
 772     }
 773     ctx->status = -1;
 774
 775     /* OSSL_CMP_rr_new() also checks if all necessary options are set */
 776     if ((rr = ossl_cmp_rr_new(ctx)) == NULL)
 777         goto end;
 778
 779     if (!send_receive_check(ctx, rr, &rp, OSSL_CMP_PKIBODY_RP))
 780         goto end;
 781
 782     rrep = rp->body->value.rp;
 783 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 784     if (sk_OSSL_CMP_PKISI_num(rrep->status) != num_RevDetails) {
 785         CMPerr(0, CMP_R_WRONG_RP_COMPONENT_COUNT);
 786         goto end;
 787     }
 788 #else
 789     if (sk_OSSL_CMP_PKISI_num(rrep->status) < 1) {
 790         CMPerr(0, CMP_R_WRONG_RP_COMPONENT_COUNT);
 791         goto end;
 792     }
 793 #endif
 794
 795     /* evaluate PKIStatus field */
 796     si = ossl_cmp_revrepcontent_get_pkisi(rrep, rsid);
 797     if (!save_statusInfo(ctx, si))
 798         goto err;
 799     switch (ossl_cmp_pkisi_get_status(si)) {
 800     case OSSL_CMP_PKISTATUS_accepted:
 801         ossl_cmp_info(ctx, "revocation accepted (PKIStatus=accepted)");
 802         result = ctx->oldCert;
 803         break;
 804     case OSSL_CMP_PKISTATUS_grantedWithMods:
 805         ossl_cmp_info(ctx, "revocation accepted (PKIStatus=grantedWithMods)");
 806         result = ctx->oldCert;
 807         break;
 808     case OSSL_CMP_PKISTATUS_rejection:
 809         CMPerr(0, CMP_R_REQUEST_REJECTED_BY_SERVER);
 810         goto err;
 811     case OSSL_CMP_PKISTATUS_revocationWarning:
 812         ossl_cmp_info(ctx, "revocation accepted (PKIStatus=revocationWarning)");
 813         result = ctx->oldCert;
 814         break;
 815     case OSSL_CMP_PKISTATUS_revocationNotification:
 816         /* interpretation as warning or error depends on CA */
 817         ossl_cmp_warn(ctx,
 818                       "revocation accepted (PKIStatus=revocationNotification)");
 819         result = ctx->oldCert;
 820         break;
 821     case OSSL_CMP_PKISTATUS_waiting:
 822     case OSSL_CMP_PKISTATUS_keyUpdateWarning:
 823         CMPerr(0, CMP_R_UNEXPECTED_PKISTATUS);
 824         goto err;
 825     default:
 826         CMPerr(0, CMP_R_UNKNOWN_PKISTATUS);
 827         goto err;
 828     }
 829
 830     /* check any present CertId in optional revCerts field */
 831     if (rrep->revCerts != NULL) {
 832         OSSL_CRMF_CERTID *cid;
 833         OSSL_CRMF_CERTTEMPLATE *tmpl =
 834             sk_OSSL_CMP_REVDETAILS_value(rr->body->value.rr, rsid)->certDetails;
 835         const X509_NAME *issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl);
 836         ASN1_INTEGER *serial = OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl);
 837
 838         if (sk_OSSL_CRMF_CERTID_num(rrep->revCerts) != num_RevDetails) {
 839             CMPerr(0, CMP_R_WRONG_RP_COMPONENT_COUNT);
 840             result = NULL;
 841             goto err;
 842         }
 843         if ((cid = ossl_cmp_revrepcontent_get_CertId(rrep, rsid)) == NULL) {
 844             result = NULL;
 845             goto err;
 846         }
 847         if (X509_NAME_cmp(issuer, OSSL_CRMF_CERTID_get0_issuer(cid)) != 0) {
 848 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 849             CMPerr(0, CMP_R_WRONG_CERTID_IN_RP);
 850             result = NULL;
 851             goto err;
 852 #endif
 853         }
 854         if (ASN1_INTEGER_cmp(serial,
 855                              OSSL_CRMF_CERTID_get0_serialNumber(cid)) != 0) {
 856 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 857             CMPerr(0, CMP_R_WRONG_SERIAL_IN_RP);
 858             result = NULL;
 859             goto err;
 860 #endif
 861         }
 862     }
 863
 864     /* check number of any optionally present crls */
 865     if (rrep->crls != NULL && sk_X509_CRL_num(rrep->crls) != num_RevDetails) {
 866         CMPerr(0, CMP_R_WRONG_RP_COMPONENT_COUNT);
 867         result = NULL;
 868         goto err;
 869     }
 870
 871  err:
 872     if (result == NULL
 873             && OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf, sizeof(buf)) != NULL)
 874         ERR_add_error_data(1, buf);
 875
 876  end:
 877     OSSL_CMP_MSG_free(rr);
 878     OSSL_CMP_MSG_free(rp);
 879     return result;
 880 }
 881
 882 STACK_OF(OSSL_CMP_ITAV) *OSSL_CMP_exec_GENM_ses(OSSL_CMP_CTX *ctx)
 883 {
 884     OSSL_CMP_MSG *genm;
 885     OSSL_CMP_MSG *genp = NULL;
 886     STACK_OF(OSSL_CMP_ITAV) *rcvd_itavs = NULL;
 887
 888     if (ctx == NULL) {
 889         CMPerr(0, CMP_R_INVALID_ARGS);
 890         return 0;
 891     }
 892
 893     if ((genm = ossl_cmp_genm_new(ctx)) == NULL)
 894         goto err;
 895
 896     if (!send_receive_check(ctx, genm, &genp, OSSL_CMP_PKIBODY_GENP))
 897         goto err;
 898
 899     /* received stack of itavs not to be freed with the genp */
 900     rcvd_itavs = genp->body->value.genp;
 901     genp->body->value.genp = NULL;
 902
 903  err:
 904     OSSL_CMP_MSG_free(genm);
 905     OSSL_CMP_MSG_free(genp);
 906
 907     return rcvd_itavs; /* recv_itavs == NULL indicates an error */
 908 }