crypto/cmp/cmp_client.c

   1 /*
   2  * Copyright 2007-2021 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 #include "e_os.h" /* ossl_sleep() */
  15
  16 /* explicit #includes not strictly needed since implied by the above: */
  17 #include <openssl/bio.h>
  18 #include <openssl/cmp.h>
  19 #include <openssl/err.h>
  20 #include <openssl/evp.h>
  21 #include <openssl/x509v3.h>
  22 #include <openssl/cmp_util.h>
  23
  24 #define IS_CREP(t) ((t) == OSSL_CMP_PKIBODY_IP || (t) == OSSL_CMP_PKIBODY_CP \
  25                         || (t) == OSSL_CMP_PKIBODY_KUP)
  26
  27 /*-
  28  * Evaluate whether there's an exception (violating the standard) configured for
  29  * handling negative responses without protection or with invalid protection.
  30  * Returns 1 on acceptance, 0 on rejection, or -1 on (internal) error.
  31  */
  32 static int unprotected_exception(const OSSL_CMP_CTX *ctx,
  33                                  const OSSL_CMP_MSG *rep,
  34                                  int invalid_protection,
  35                                  int expected_type /* ignored here */)
  36 {
  37     int rcvd_type = OSSL_CMP_MSG_get_bodytype(rep /* may be NULL */);
  38     const char *msg_type = NULL;
  39
  40     if (!ossl_assert(ctx != NULL && rep != NULL))
  41         return -1;
  42
  43     if (!ctx->unprotectedErrors)
  44         return 0;
  45
  46     switch (rcvd_type) {
  47     case OSSL_CMP_PKIBODY_ERROR:
  48         msg_type = "error response";
  49         break;
  50     case OSSL_CMP_PKIBODY_RP:
  51         {
  52             OSSL_CMP_PKISI *si =
  53                 ossl_cmp_revrepcontent_get_pkisi(rep->body->value.rp,
  54                                                  OSSL_CMP_REVREQSID);
  55
  56             if (si == NULL)
  57                 return -1;
  58             if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_rejection)
  59                 msg_type = "revocation response message with rejection status";
  60             break;
  61         }
  62     case OSSL_CMP_PKIBODY_PKICONF:
  63         msg_type = "PKI Confirmation message";
  64         break;
  65     default:
  66         if (IS_CREP(rcvd_type)) {
  67             OSSL_CMP_CERTREPMESSAGE *crepmsg = rep->body->value.ip;
  68             OSSL_CMP_CERTRESPONSE *crep =
  69                 ossl_cmp_certrepmessage_get0_certresponse(crepmsg,
  70                                                           -1 /* any rid */);
  71
  72             if (sk_OSSL_CMP_CERTRESPONSE_num(crepmsg->response) > 1)
  73                 return -1;
  74             if (crep == NULL)
  75                 return -1;
  76             if (ossl_cmp_pkisi_get_status(crep->status)
  77                 == OSSL_CMP_PKISTATUS_rejection)
  78                 msg_type = "CertRepMessage with rejection status";
  79         }
  80     }
  81     if (msg_type == NULL)
  82         return 0;
  83     ossl_cmp_log2(WARN, ctx, "ignoring %s protection of %s",
  84                   invalid_protection ? "invalid" : "missing", msg_type);
  85     return 1;
  86 }
  87
  88 /* Save error info from PKIStatusInfo field of a certresponse into ctx */
  89 static int save_statusInfo(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si)
  90 {
  91     int i;
  92     OSSL_CMP_PKIFREETEXT *ss;
  93
  94     if (!ossl_assert(ctx != NULL && si != NULL))
  95         return 0;
  96
  97     if ((ctx->status = ossl_cmp_pkisi_get_status(si)) < 0)
  98         return 0;
  99
 100     ctx->failInfoCode = 0;
 101     if (si->failInfo != NULL) {
 102         for (i = 0; i <= OSSL_CMP_PKIFAILUREINFO_MAX; i++) {
 103             if (ASN1_BIT_STRING_get_bit(si->failInfo, i))
 104                 ctx->failInfoCode |= (1 << i);
 105         }
 106     }
 107
 108     if (!ossl_cmp_ctx_set0_statusString(ctx, sk_ASN1_UTF8STRING_new_null())
 109             || (ctx->statusString == NULL))
 110         return 0;
 111
 112     ss = si->statusString; /* may be NULL */
 113     for (i = 0; i < sk_ASN1_UTF8STRING_num(ss); i++) {
 114         ASN1_UTF8STRING *str = sk_ASN1_UTF8STRING_value(ss, i);
 115
 116         if (!sk_ASN1_UTF8STRING_push(ctx->statusString, ASN1_STRING_dup(str)))
 117             return 0;
 118     }
 119     return 1;
 120 }
 121
 122 /*-
 123  * Perform the generic aspects of sending a request and receiving a response.
 124  * Returns 1 on success and provides the received PKIMESSAGE in *rep.
 125  * Returns 0 on error.
 126  * Regardless of success, caller is responsible for freeing *rep (unless NULL).
 127  */
 128 static int send_receive_check(OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *req,
 129                               OSSL_CMP_MSG **rep, int expected_type)
 130 {
 131     int is_enrollment = IS_CREP(expected_type)
 132         || expected_type == OSSL_CMP_PKIBODY_POLLREP
 133         || expected_type == OSSL_CMP_PKIBODY_PKICONF;
 134     const char *req_type_str =
 135         ossl_cmp_bodytype_to_string(OSSL_CMP_MSG_get_bodytype(req));
 136     const char *expected_type_str = ossl_cmp_bodytype_to_string(expected_type);
 137     int msg_timeout;
 138     int bt;
 139     time_t now = time(NULL);
 140     int time_left;
 141     OSSL_CMP_transfer_cb_t transfer_cb = ctx->transfer_cb;
 142
 143     if (transfer_cb == NULL)
 144         transfer_cb = OSSL_CMP_MSG_http_perform;
 145
 146     *rep = NULL;
 147     msg_timeout = ctx->msg_timeout; /* backup original value */
 148     if (is_enrollment && ctx->total_timeout > 0 /* timeout is not infinite */) {
 149         if (now >= ctx->end_time) {
 150             ERR_raise(ERR_LIB_CMP, CMP_R_TOTAL_TIMEOUT);
 151             return 0;
 152         }
 153         if (!ossl_assert(ctx->end_time - time(NULL) < INT_MAX)) {
 154             /* actually cannot happen due to assignment in initial_certreq() */
 155             ERR_raise(ERR_LIB_CMP, CMP_R_INVALID_ARGS);
 156             return 0;
 157         }
 158         time_left = (int)(ctx->end_time - now);
 159         if (ctx->msg_timeout == 0 || time_left < ctx->msg_timeout)
 160             ctx->msg_timeout = time_left;
 161     }
 162
 163     /* should print error queue since transfer_cb may call ERR_clear_error() */
 164     OSSL_CMP_CTX_print_errors(ctx);
 165
 166     ossl_cmp_log1(INFO, ctx, "sending %s", req_type_str);
 167
 168     *rep = (*transfer_cb)(ctx, req);
 169     ctx->msg_timeout = msg_timeout; /* restore original value */
 170
 171     if (*rep == NULL) {
 172         ERR_raise_data(ERR_LIB_CMP,
 173                        ctx->total_timeout > 0 && time(NULL) >= ctx->end_time ?
 174                        CMP_R_TOTAL_TIMEOUT : CMP_R_TRANSFER_ERROR,
 175                        "request sent: %s, expected response: %s",
 176                        req_type_str, expected_type_str);
 177         return 0;
 178     }
 179
 180     bt = OSSL_CMP_MSG_get_bodytype(*rep);
 181     /*
 182      * The body type in the 'bt' variable is not yet verified.
 183      * Still we use this preliminary value already for a progress report because
 184      * the following msg verification may also produce log entries and may fail.
 185      */
 186     ossl_cmp_log1(INFO, ctx, "received %s", ossl_cmp_bodytype_to_string(bt));
 187
 188     /* copy received extraCerts to ctx->extraCertsIn so they can be retrieved */
 189     if (bt != OSSL_CMP_PKIBODY_POLLREP && bt != OSSL_CMP_PKIBODY_PKICONF
 190             && !ossl_cmp_ctx_set1_extraCertsIn(ctx, (*rep)->extraCerts))
 191         return 0;
 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     ERR_raise(ERR_LIB_CMP, 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: %08lX",
 220                                 ASN1_INTEGER_get(emc->errorCode)) > 0)
 221             ERR_add_error_data(1, buf);
 222         if (emc->errorDetails != NULL) {
 223             char *text = ossl_sk_ASN1_UTF8STRING2text(emc->errorDetails, ", ",
 224                                                       OSSL_CMP_PKISI_BUFLEN - 1);
 225
 226             if (text != NULL && *text != '\0')
 227                 ERR_add_error_data(2, "; errorDetails: ", text);
 228             OPENSSL_free(text);
 229         }
 230         if (ctx->status != OSSL_CMP_PKISTATUS_rejection) {
 231             ERR_raise(ERR_LIB_CMP, 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         if ((preq = ossl_cmp_pollReq_new(ctx, rid)) == NULL)
 265             goto err;
 266
 267         if (!send_receive_check(ctx, preq, &prep, OSSL_CMP_PKIBODY_POLLREP))
 268             goto err;
 269
 270         /* handle potential pollRep */
 271         if (OSSL_CMP_MSG_get_bodytype(prep) == OSSL_CMP_PKIBODY_POLLREP) {
 272             OSSL_CMP_POLLREPCONTENT *prc = prep->body->value.pollRep;
 273             OSSL_CMP_POLLREP *pollRep = NULL;
 274             int64_t check_after;
 275             char str[OSSL_CMP_PKISI_BUFLEN];
 276             int len;
 277
 278             if (sk_OSSL_CMP_POLLREP_num(prc) > 1) {
 279                 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_RESPONSES_NOT_SUPPORTED);
 280                 goto err;
 281             }
 282             pollRep = ossl_cmp_pollrepcontent_get0_pollrep(prc, rid);
 283             if (pollRep == NULL)
 284                 goto err;
 285
 286             if (!ASN1_INTEGER_get_int64(&check_after, pollRep->checkAfter)) {
 287                 ERR_raise(ERR_LIB_CMP, CMP_R_BAD_CHECKAFTER_IN_POLLREP);
 288                 goto err;
 289             }
 290             if (check_after < 0 || (uint64_t)check_after
 291                 > (sleep ? ULONG_MAX / 1000 : INT_MAX)) {
 292                 ERR_raise(ERR_LIB_CMP, CMP_R_CHECKAFTER_OUT_OF_RANGE);
 293                 if (BIO_snprintf(str, OSSL_CMP_PKISI_BUFLEN, "value = %jd",
 294                                  check_after) >= 0)
 295                     ERR_add_error_data(1, str);
 296                 goto err;
 297             }
 298
 299             if (pollRep->reason == NULL
 300                     || (len = BIO_snprintf(str, OSSL_CMP_PKISI_BUFLEN,
 301                                            " with reason = '")) < 0) {
 302                 *str = '\0';
 303             } else {
 304                 char *text = ossl_sk_ASN1_UTF8STRING2text(pollRep->reason, ", ",
 305                                                           sizeof(str) - len - 2);
 306
 307                 if (text == NULL
 308                         || BIO_snprintf(str + len, sizeof(str) - len,
 309                                         "%s'", text) < 0)
 310                     *str = '\0';
 311                 OPENSSL_free(text);
 312             }
 313             ossl_cmp_log2(INFO, ctx,
 314                           "received polling response%s; checkAfter = %ld seconds",
 315                           str, check_after);
 316
 317             if (ctx->total_timeout > 0) { /* timeout is not infinite */
 318                 const int exp = 5; /* expected max time per msg round trip */
 319                 int64_t time_left = (int64_t)(ctx->end_time - exp - time(NULL));
 320
 321                 if (time_left <= 0) {
 322                     ERR_raise(ERR_LIB_CMP, CMP_R_TOTAL_TIMEOUT);
 323                     goto err;
 324                 }
 325                 if (time_left < check_after)
 326                     check_after = time_left;
 327                 /* poll one last time just when timeout was reached */
 328             }
 329
 330             OSSL_CMP_MSG_free(preq);
 331             preq = NULL;
 332             OSSL_CMP_MSG_free(prep);
 333             prep = NULL;
 334             if (sleep) {
 335                 ossl_sleep((unsigned long)(1000 * check_after));
 336             } else {
 337                 if (checkAfter != NULL)
 338                     *checkAfter = (int)check_after;
 339                 return -1; /* exits the loop */
 340             }
 341         } else {
 342             ossl_cmp_info(ctx, "received ip/cp/kup after polling");
 343             /* any other body type has been rejected by send_receive_check() */
 344             break;
 345         }
 346     }
 347     if (prep == NULL)
 348         goto err;
 349
 350     OSSL_CMP_MSG_free(preq);
 351     *rep = prep;
 352
 353     return 1;
 354  err:
 355     OSSL_CMP_MSG_free(preq);
 356     OSSL_CMP_MSG_free(prep);
 357     return 0;
 358 }
 359
 360 /* Send certConf for IR, CR or KUR sequences and check response */
 361 int ossl_cmp_exchange_certConf(OSSL_CMP_CTX *ctx, int fail_info,
 362                                const char *txt)
 363 {
 364     OSSL_CMP_MSG *certConf;
 365     OSSL_CMP_MSG *PKIconf = NULL;
 366     int res = 0;
 367
 368     /* OSSL_CMP_certConf_new() also checks if all necessary options are set */
 369     if ((certConf = ossl_cmp_certConf_new(ctx, fail_info, txt)) == NULL)
 370         goto err;
 371
 372     res = send_receive_check(ctx, certConf, &PKIconf, OSSL_CMP_PKIBODY_PKICONF);
 373
 374  err:
 375     OSSL_CMP_MSG_free(certConf);
 376     OSSL_CMP_MSG_free(PKIconf);
 377     return res;
 378 }
 379
 380 /* Send given error and check response */
 381 int ossl_cmp_exchange_error(OSSL_CMP_CTX *ctx, int status, int fail_info,
 382                             const char *txt, int errorCode, const char *details)
 383 {
 384     OSSL_CMP_MSG *error = NULL;
 385     OSSL_CMP_PKISI *si = NULL;
 386     OSSL_CMP_MSG *PKIconf = NULL;
 387     int res = 0;
 388
 389     if ((si = OSSL_CMP_STATUSINFO_new(status, fail_info, txt)) == NULL)
 390         goto err;
 391     /* ossl_cmp_error_new() also checks if all necessary options are set */
 392     if ((error = ossl_cmp_error_new(ctx, si, errorCode, details, 0)) == NULL)
 393         goto err;
 394
 395     res = send_receive_check(ctx, error, &PKIconf, OSSL_CMP_PKIBODY_PKICONF);
 396
 397  err:
 398     OSSL_CMP_MSG_free(error);
 399     OSSL_CMP_PKISI_free(si);
 400     OSSL_CMP_MSG_free(PKIconf);
 401     return res;
 402 }
 403
 404 /*-
 405  * Retrieve a copy of the certificate, if any, from the given CertResponse.
 406  * Take into account PKIStatusInfo of CertResponse in ctx, report it on error.
 407  * Returns NULL if not found or on error.
 408  */
 409 static X509 *get1_cert_status(OSSL_CMP_CTX *ctx, int bodytype,
 410                               OSSL_CMP_CERTRESPONSE *crep)
 411 {
 412     char buf[OSSL_CMP_PKISI_BUFLEN];
 413     X509 *crt = NULL;
 414     EVP_PKEY *privkey;
 415
 416     if (!ossl_assert(ctx != NULL && crep != NULL))
 417         return NULL;
 418
 419     privkey = OSSL_CMP_CTX_get0_newPkey(ctx, 1);
 420     switch (ossl_cmp_pkisi_get_status(crep->status)) {
 421     case OSSL_CMP_PKISTATUS_waiting:
 422         ossl_cmp_err(ctx,
 423                      "received \"waiting\" status for cert when actually aiming to extract cert");
 424         ERR_raise(ERR_LIB_CMP, CMP_R_ENCOUNTERED_WAITING);
 425         goto err;
 426     case OSSL_CMP_PKISTATUS_grantedWithMods:
 427         ossl_cmp_warn(ctx, "received \"grantedWithMods\" for certificate");
 428         break;
 429     case OSSL_CMP_PKISTATUS_accepted:
 430         break;
 431         /* get all information in case of a rejection before going to error */
 432     case OSSL_CMP_PKISTATUS_rejection:
 433         ossl_cmp_err(ctx, "received \"rejection\" status rather than cert");
 434         ERR_raise(ERR_LIB_CMP, CMP_R_REQUEST_REJECTED_BY_SERVER);
 435         goto err;
 436     case OSSL_CMP_PKISTATUS_revocationWarning:
 437         ossl_cmp_warn(ctx,
 438                       "received \"revocationWarning\" - a revocation of the cert is imminent");
 439         break;
 440     case OSSL_CMP_PKISTATUS_revocationNotification:
 441         ossl_cmp_warn(ctx,
 442                       "received \"revocationNotification\" - a revocation of the cert has occurred");
 443         break;
 444     case OSSL_CMP_PKISTATUS_keyUpdateWarning:
 445         if (bodytype != OSSL_CMP_PKIBODY_KUR) {
 446             ERR_raise(ERR_LIB_CMP, CMP_R_ENCOUNTERED_KEYUPDATEWARNING);
 447             goto err;
 448         }
 449         break;
 450     default:
 451         ossl_cmp_log1(ERROR, ctx,
 452                       "received unsupported PKIStatus %d for certificate",
 453                       ctx->status);
 454         ERR_raise(ERR_LIB_CMP, CMP_R_UNKNOWN_PKISTATUS);
 455         goto err;
 456     }
 457     crt = ossl_cmp_certresponse_get1_cert(crep, ctx, privkey);
 458     if (crt == NULL) /* according to PKIStatus, we can expect a cert */
 459         ERR_raise(ERR_LIB_CMP, CMP_R_CERTIFICATE_NOT_FOUND);
 460
 461     return crt;
 462
 463  err:
 464     if (OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf, sizeof(buf)) != NULL)
 465         ERR_add_error_data(1, buf);
 466     return NULL;
 467 }
 468
 469 /*-
 470  * Callback fn validating that the new certificate can be verified, using
 471  * ctx->certConf_cb_arg, which has been initialized using opt_out_trusted, and
 472  * ctx->untrusted, which at this point already contains msg->extraCerts.
 473  * Returns 0 on acceptance, else a bit field reflecting PKIFailureInfo.
 474  * Quoting from RFC 4210 section 5.1. Overall PKI Message:
 475  *     The extraCerts field can contain certificates that may be useful to
 476  *     the recipient.  For example, this can be used by a CA or RA to
 477  *     present an end entity with certificates that it needs to verify its
 478  *     own new certificate (if, for example, the CA that issued the end
 479  *     entity's certificate is not a root CA for the end entity).  Note that
 480  *     this field does not necessarily contain a certification path; the
 481  *     recipient may have to sort, select from, or otherwise process the
 482  *     extra certificates in order to use them.
 483  * Note: While often handy, there is no hard requirement by CMP that
 484  * an EE must be able to validate the certificates it gets enrolled.
 485  */
 486 int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,
 487                          const char **text)
 488 {
 489     X509_STORE *out_trusted = OSSL_CMP_CTX_get_certConf_cb_arg(ctx);
 490     STACK_OF(X509) *chain = NULL;
 491     (void)text; /* make (artificial) use of var to prevent compiler warning */
 492
 493     if (fail_info != 0) /* accept any error flagged by CMP core library */
 494         return fail_info;
 495
 496     ossl_cmp_debug(ctx, "trying to build chain for newly enrolled cert");
 497     chain = X509_build_chain(cert, ctx->untrusted, out_trusted /* maybe NULL */,
 498                              0, ctx->libctx, ctx->propq);
 499     if (sk_X509_num(chain) > 0)
 500         X509_free(sk_X509_shift(chain)); /* remove leaf (EE) cert */
 501     if (out_trusted != NULL) {
 502         if (chain == NULL) {
 503             ossl_cmp_err(ctx, "failed building chain for newly enrolled cert");
 504             fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_incorrectData;
 505         } else {
 506             ossl_cmp_debug(ctx,
 507                            "succeeded building proper chain for newly enrolled cert");
 508         }
 509     } else if (chain == NULL) {
 510         ossl_cmp_warn(ctx, "could not build approximate chain for newly enrolled cert, resorting to received extraCerts");
 511         chain = OSSL_CMP_CTX_get1_extraCertsIn(ctx);
 512     } else {
 513         ossl_cmp_debug(ctx,
 514                        "success building approximate chain for newly enrolled cert");
 515     }
 516     (void)ossl_cmp_ctx_set1_newChain(ctx, chain);
 517     sk_X509_pop_free(chain, X509_free);
 518
 519     return fail_info;
 520 }
 521
 522 /*-
 523  * Perform the generic handling of certificate responses for IR/CR/KUR/P10CR.
 524  * Returns -1 on receiving pollRep if sleep == 0, setting the checkAfter value.
 525  * Returns 1 on success and provides the received PKIMESSAGE in *resp.
 526  * Returns 0 on error (which includes the case that timeout has been reached).
 527  * Regardless of success, caller is responsible for freeing *resp (unless NULL).
 528  */
 529 static int cert_response(OSSL_CMP_CTX *ctx, int sleep, int rid,
 530                          OSSL_CMP_MSG **resp, int *checkAfter,
 531                          int req_type, int expected_type)
 532 {
 533     EVP_PKEY *rkey = OSSL_CMP_CTX_get0_newPkey(ctx /* may be NULL */, 0);
 534     int fail_info = 0; /* no failure */
 535     const char *txt = NULL;
 536     OSSL_CMP_CERTREPMESSAGE *crepmsg;
 537     OSSL_CMP_CERTRESPONSE *crep;
 538     OSSL_CMP_certConf_cb_t cb;
 539     X509 *cert;
 540     char *subj = NULL;
 541     int ret = 1;
 542
 543     if (!ossl_assert(ctx != NULL))
 544         return 0;
 545
 546  retry:
 547     crepmsg = (*resp)->body->value.ip; /* same for cp and kup */
 548     if (sk_OSSL_CMP_CERTRESPONSE_num(crepmsg->response) > 1) {
 549         ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_RESPONSES_NOT_SUPPORTED);
 550         return 0;
 551     }
 552     crep = ossl_cmp_certrepmessage_get0_certresponse(crepmsg, rid);
 553     if (crep == NULL)
 554         return 0;
 555     if (!save_statusInfo(ctx, crep->status))
 556         return 0;
 557     if (rid == -1) {
 558         /* for OSSL_CMP_PKIBODY_P10CR learn CertReqId from response */
 559         rid = ossl_cmp_asn1_get_int(crep->certReqId);
 560         if (rid == -1) {
 561             ERR_raise(ERR_LIB_CMP, CMP_R_BAD_REQUEST_ID);
 562             return 0;
 563         }
 564     }
 565
 566     if (ossl_cmp_pkisi_get_status(crep->status) == OSSL_CMP_PKISTATUS_waiting) {
 567         OSSL_CMP_MSG_free(*resp);
 568         *resp = NULL;
 569         if ((ret = poll_for_response(ctx, sleep, rid, resp, checkAfter)) != 0) {
 570             if (ret == -1) /* at this point implies sleep == 0 */
 571                 return ret; /* waiting */
 572             goto retry; /* got ip/cp/kup, which may still indicate 'waiting' */
 573         } else {
 574             ERR_raise(ERR_LIB_CMP, CMP_R_POLLING_FAILED);
 575             return 0;
 576         }
 577     }
 578
 579     cert = get1_cert_status(ctx, (*resp)->body->type, crep);
 580     if (cert == NULL) {
 581         ERR_add_error_data(1, "; cannot extract certificate from response");
 582         return 0;
 583     }
 584     if (!ossl_cmp_ctx_set0_newCert(ctx, cert))
 585         return 0;
 586
 587     /*
 588      * if the CMP server returned certificates in the caPubs field, copy them
 589      * to the context so that they can be retrieved if necessary
 590      */
 591     if (crepmsg->caPubs != NULL
 592             && !ossl_cmp_ctx_set1_caPubs(ctx, crepmsg->caPubs))
 593         return 0;
 594
 595     subj = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0);
 596     if (rkey != NULL
 597         /* X509_check_private_key() also works if rkey is just public key */
 598             && !(X509_check_private_key(ctx->newCert, rkey))) {
 599         fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_incorrectData;
 600         txt = "public key in new certificate does not match our enrollment key";
 601         /*-
 602          * not calling (void)ossl_cmp_exchange_error(ctx,
 603          *                   OSSL_CMP_PKISTATUS_rejection, fail_info, txt)
 604          * not throwing CMP_R_CERTIFICATE_NOT_ACCEPTED with txt
 605          * not returning 0
 606          * since we better leave this for the certConf_cb to decide
 607          */
 608     }
 609
 610     /*
 611      * Execute the certification checking callback function,
 612      * which can determine whether to accept a newly enrolled certificate.
 613      * It may overrule the pre-decision reflected in 'fail_info' and '*txt'.
 614      */
 615     cb = ctx->certConf_cb != NULL ? ctx->certConf_cb : OSSL_CMP_certConf_cb;
 616     if ((fail_info = cb(ctx, ctx->newCert, fail_info, &txt)) != 0
 617             && txt == NULL)
 618         txt = "CMP client did not accept it";
 619     if (fail_info != 0) /* immediately log error before any certConf exchange */
 620         ossl_cmp_log1(ERROR, ctx,
 621                       "rejecting newly enrolled cert with subject: %s", subj);
 622     if (!ctx->disableConfirm
 623             && !ossl_cmp_hdr_has_implicitConfirm((*resp)->header)) {
 624         if (!ossl_cmp_exchange_certConf(ctx, fail_info, txt))
 625             ret = 0;
 626     }
 627
 628     /* not throwing failure earlier as transfer_cb may call ERR_clear_error() */
 629     if (fail_info != 0) {
 630         ERR_raise_data(ERR_LIB_CMP, CMP_R_CERTIFICATE_NOT_ACCEPTED,
 631                        "rejecting newly enrolled cert with subject: %s; %s",
 632                        subj, txt);
 633         ret = 0;
 634     }
 635     OPENSSL_free(subj);
 636     return ret;
 637 }
 638
 639 static int initial_certreq(OSSL_CMP_CTX *ctx,
 640                            int req_type, const OSSL_CRMF_MSG *crm,
 641                            OSSL_CMP_MSG **p_rep, int rep_type)
 642 {
 643     OSSL_CMP_MSG *req;
 644     int res;
 645
 646     ctx->status = -1;
 647     if (!ossl_cmp_ctx_set0_newCert(ctx, NULL))
 648         return 0;
 649
 650     if (ctx->total_timeout > 0) /* else ctx->end_time is not used */
 651         ctx->end_time = time(NULL) + ctx->total_timeout;
 652
 653     /* also checks if all necessary options are set */
 654     if ((req = ossl_cmp_certreq_new(ctx, req_type, crm)) == NULL)
 655         return 0;
 656
 657     res = send_receive_check(ctx, req, p_rep, rep_type);
 658     OSSL_CMP_MSG_free(req);
 659     return res;
 660 }
 661
 662 int OSSL_CMP_try_certreq(OSSL_CMP_CTX *ctx, int req_type,
 663                          const OSSL_CRMF_MSG *crm, int *checkAfter)
 664 {
 665     OSSL_CMP_MSG *rep = NULL;
 666     int is_p10 = req_type == OSSL_CMP_PKIBODY_P10CR;
 667     int rid = is_p10 ? -1 : OSSL_CMP_CERTREQID;
 668     int rep_type = is_p10 ? OSSL_CMP_PKIBODY_CP : req_type + 1;
 669     int res = 0;
 670
 671     if (ctx == NULL) {
 672         ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
 673         return 0;
 674     }
 675
 676     if (ctx->status != OSSL_CMP_PKISTATUS_waiting) { /* not polling already */
 677         if (!initial_certreq(ctx, req_type, crm, &rep, rep_type))
 678             goto err;
 679     } else {
 680         if (req_type < 0)
 681             return ossl_cmp_exchange_error(ctx, OSSL_CMP_PKISTATUS_rejection,
 682                                            0, "polling aborted",
 683                                            0 /* errorCode */, "by application");
 684         res = poll_for_response(ctx, 0 /* no sleep */, rid, &rep, checkAfter);
 685         if (res <= 0) /* waiting or error */
 686             return res;
 687     }
 688     res = cert_response(ctx, 0 /* no sleep */, rid, &rep, checkAfter,
 689                         req_type, rep_type);
 690
 691  err:
 692     OSSL_CMP_MSG_free(rep);
 693     return res;
 694 }
 695
 696 /*-
 697  * Do the full sequence CR/IR/KUR/P10CR, CP/IP/KUP/CP,
 698  * certConf, PKIconf, and polling if required.
 699  * Will sleep as long as indicated by the server (according to checkAfter).
 700  * All enrollment options need to be present in the context.
 701  * Returns pointer to received certificate, or NULL if none was received.
 702  */
 703 X509 *OSSL_CMP_exec_certreq(OSSL_CMP_CTX *ctx, int req_type,
 704                             const OSSL_CRMF_MSG *crm)
 705 {
 706
 707     OSSL_CMP_MSG *rep = NULL;
 708     int is_p10 = req_type == OSSL_CMP_PKIBODY_P10CR;
 709     int rid = is_p10 ? -1 : OSSL_CMP_CERTREQID;
 710     int rep_type = is_p10 ? OSSL_CMP_PKIBODY_CP : req_type + 1;
 711     X509 *result = NULL;
 712
 713     if (ctx == NULL) {
 714         ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
 715         return NULL;
 716     }
 717
 718     if (!initial_certreq(ctx, req_type, crm, &rep, rep_type))
 719         goto err;
 720
 721     if (cert_response(ctx, 1 /* sleep */, rid, &rep, NULL, req_type, rep_type)
 722         <= 0)
 723         goto err;
 724
 725     result = ctx->newCert;
 726  err:
 727     OSSL_CMP_MSG_free(rep);
 728     return result;
 729 }
 730
 731 int OSSL_CMP_exec_RR_ses(OSSL_CMP_CTX *ctx)
 732 {
 733     OSSL_CMP_MSG *rr = NULL;
 734     OSSL_CMP_MSG *rp = NULL;
 735     const int num_RevDetails = 1;
 736     const int rsid = OSSL_CMP_REVREQSID;
 737     OSSL_CMP_REVREPCONTENT *rrep = NULL;
 738     OSSL_CMP_PKISI *si = NULL;
 739     char buf[OSSL_CMP_PKISI_BUFLEN];
 740     int ret = 0;
 741
 742     if (ctx == NULL) {
 743         ERR_raise(ERR_LIB_CMP, CMP_R_INVALID_ARGS);
 744         return 0;
 745     }
 746     if (ctx->oldCert == NULL && ctx->p10CSR == NULL) {
 747         ERR_raise(ERR_LIB_CMP, CMP_R_MISSING_REFERENCE_CERT);
 748         return 0;
 749     }
 750     ctx->status = -1;
 751
 752     /* OSSL_CMP_rr_new() also checks if all necessary options are set */
 753     if ((rr = ossl_cmp_rr_new(ctx)) == NULL)
 754         goto end;
 755
 756     if (!send_receive_check(ctx, rr, &rp, OSSL_CMP_PKIBODY_RP))
 757         goto end;
 758
 759     rrep = rp->body->value.rp;
 760 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 761     if (sk_OSSL_CMP_PKISI_num(rrep->status) != num_RevDetails) {
 762         ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
 763         goto end;
 764     }
 765 #else
 766     if (sk_OSSL_CMP_PKISI_num(rrep->status) < 1) {
 767         ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
 768         goto end;
 769     }
 770 #endif
 771
 772     /* evaluate PKIStatus field */
 773     si = ossl_cmp_revrepcontent_get_pkisi(rrep, rsid);
 774     if (!save_statusInfo(ctx, si))
 775         goto err;
 776     switch (ossl_cmp_pkisi_get_status(si)) {
 777     case OSSL_CMP_PKISTATUS_accepted:
 778         ossl_cmp_info(ctx, "revocation accepted (PKIStatus=accepted)");
 779         ret = 1;
 780         break;
 781     case OSSL_CMP_PKISTATUS_grantedWithMods:
 782         ossl_cmp_info(ctx, "revocation accepted (PKIStatus=grantedWithMods)");
 783         ret = 1;
 784         break;
 785     case OSSL_CMP_PKISTATUS_rejection:
 786         ERR_raise(ERR_LIB_CMP, CMP_R_REQUEST_REJECTED_BY_SERVER);
 787         goto err;
 788     case OSSL_CMP_PKISTATUS_revocationWarning:
 789         ossl_cmp_info(ctx, "revocation accepted (PKIStatus=revocationWarning)");
 790         ret = 1;
 791         break;
 792     case OSSL_CMP_PKISTATUS_revocationNotification:
 793         /* interpretation as warning or error depends on CA */
 794         ossl_cmp_warn(ctx,
 795                       "revocation accepted (PKIStatus=revocationNotification)");
 796         ret = 1;
 797         break;
 798     case OSSL_CMP_PKISTATUS_waiting:
 799     case OSSL_CMP_PKISTATUS_keyUpdateWarning:
 800         ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKISTATUS);
 801         goto err;
 802     default:
 803         ERR_raise(ERR_LIB_CMP, CMP_R_UNKNOWN_PKISTATUS);
 804         goto err;
 805     }
 806
 807     /* check any present CertId in optional revCerts field */
 808     if (sk_OSSL_CRMF_CERTID_num(rrep->revCerts) >= 1) {
 809         OSSL_CRMF_CERTID *cid;
 810         OSSL_CRMF_CERTTEMPLATE *tmpl =
 811             sk_OSSL_CMP_REVDETAILS_value(rr->body->value.rr, rsid)->certDetails;
 812         const X509_NAME *issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl);
 813         ASN1_INTEGER *serial = OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl);
 814
 815         if (sk_OSSL_CRMF_CERTID_num(rrep->revCerts) != num_RevDetails) {
 816             ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
 817             ret = 0;
 818             goto err;
 819         }
 820         if ((cid = ossl_cmp_revrepcontent_get_CertId(rrep, rsid)) == NULL) {
 821             ERR_raise(ERR_LIB_CMP, CMP_R_MISSING_CERTID);
 822             ret = 0;
 823             goto err;
 824         }
 825         if (X509_NAME_cmp(issuer, OSSL_CRMF_CERTID_get0_issuer(cid)) != 0) {
 826 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 827             ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_CERTID_IN_RP);
 828             ret = 0;
 829             goto err;
 830 #endif
 831         }
 832         if (ASN1_INTEGER_cmp(serial,
 833                              OSSL_CRMF_CERTID_get0_serialNumber(cid)) != 0) {
 834 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
 835             ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_SERIAL_IN_RP);
 836             ret = 0;
 837             goto err;
 838 #endif
 839         }
 840     }
 841
 842     /* check number of any optionally present crls */
 843     if (rrep->crls != NULL && sk_X509_CRL_num(rrep->crls) != num_RevDetails) {
 844         ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
 845         ret = 0;
 846         goto err;
 847     }
 848
 849  err:
 850     if (ret == 0
 851             && OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf, sizeof(buf)) != NULL)
 852         ERR_add_error_data(1, buf);
 853
 854  end:
 855     OSSL_CMP_MSG_free(rr);
 856     OSSL_CMP_MSG_free(rp);
 857     return ret;
 858 }
 859
 860 STACK_OF(OSSL_CMP_ITAV) *OSSL_CMP_exec_GENM_ses(OSSL_CMP_CTX *ctx)
 861 {
 862     OSSL_CMP_MSG *genm;
 863     OSSL_CMP_MSG *genp = NULL;
 864     STACK_OF(OSSL_CMP_ITAV) *rcvd_itavs = NULL;
 865
 866     if (ctx == NULL) {
 867         ERR_raise(ERR_LIB_CMP, CMP_R_INVALID_ARGS);
 868         return 0;
 869     }
 870     ctx->status = -1;
 871
 872     if ((genm = ossl_cmp_genm_new(ctx)) == NULL)
 873         goto err;
 874
 875     if (!send_receive_check(ctx, genm, &genp, OSSL_CMP_PKIBODY_GENP))
 876         goto err;
 877
 878     /* received stack of itavs not to be freed with the genp */
 879     rcvd_itavs = genp->body->value.genp;
 880     genp->body->value.genp = NULL;
 881
 882  err:
 883     OSSL_CMP_MSG_free(genm);
 884     OSSL_CMP_MSG_free(genp);
 885
 886     return rcvd_itavs; /* recv_itavs == NULL indicates an error */
 887 }