1 /* 2 * Copyright 2007-2026 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 /* general CMP server functions */ 13 14 #include <openssl/asn1t.h> 15 16 #include "cmp_local.h" 17 18 /* explicit #includes not strictly needed since implied by the above: */ 19 #include <openssl/cmp.h> 20 #include <openssl/err.h> 21 22 /* the context for the generic CMP server */ 23 struct ossl_cmp_srv_ctx_st { 24 OSSL_CMP_CTX *ctx; /* CMP client context reused for transactionID etc. */ 25 void *custom_ctx; /* application-specific server context */ 26 int certReqId; /* of ir/cr/kur, OSSL_CMP_CERTREQID_NONE for p10cr */ 27 int polling; /* current transaction is in polling mode */ 28 29 OSSL_CMP_SRV_cert_request_cb_t process_cert_request; 30 OSSL_CMP_SRV_rr_cb_t process_rr; 31 OSSL_CMP_SRV_genm_cb_t process_genm; 32 OSSL_CMP_SRV_error_cb_t process_error; 33 OSSL_CMP_SRV_certConf_cb_t process_certConf; 34 OSSL_CMP_SRV_pollReq_cb_t process_pollReq; 35 OSSL_CMP_SRV_delayed_delivery_cb_t delayed_delivery; 36 OSSL_CMP_SRV_clean_transaction_cb_t clean_transaction; 37 38 int sendUnprotectedErrors; /* Send error and rejection msgs unprotected */ 39 int acceptUnprotected; /* Accept requests with no/invalid prot. */ 40 int acceptRAVerified; /* Accept ir/cr/kur with POPO RAVerified */ 41 int grantImplicitConfirm; /* Grant implicit confirmation if requested */ 42 43 }; /* OSSL_CMP_SRV_CTX */ 44 45 void OSSL_CMP_SRV_CTX_free(OSSL_CMP_SRV_CTX *srv_ctx) 46 { 47 if (srv_ctx == NULL) 48 return; 49 50 OSSL_CMP_CTX_free(srv_ctx->ctx); 51 OPENSSL_free(srv_ctx); 52 } 53 54 OSSL_CMP_SRV_CTX *OSSL_CMP_SRV_CTX_new(OSSL_LIB_CTX *libctx, const char *propq) 55 { 56 OSSL_CMP_SRV_CTX *ctx = OPENSSL_zalloc(sizeof(OSSL_CMP_SRV_CTX)); 57 58 if (ctx == NULL) 59 goto err; 60 61 if ((ctx->ctx = OSSL_CMP_CTX_new(libctx, propq)) == NULL) 62 goto err; 63 ctx->certReqId = OSSL_CMP_CERTREQID_INVALID; 64 65 /* all other elements are initialized to 0 or NULL, respectively */ 66 return ctx; 67 err: 68 OSSL_CMP_SRV_CTX_free(ctx); 69 return NULL; 70 } 71 72 int OSSL_CMP_SRV_CTX_init(OSSL_CMP_SRV_CTX *srv_ctx, void *custom_ctx, 73 OSSL_CMP_SRV_cert_request_cb_t process_cert_request, 74 OSSL_CMP_SRV_rr_cb_t process_rr, 75 OSSL_CMP_SRV_genm_cb_t process_genm, 76 OSSL_CMP_SRV_error_cb_t process_error, 77 OSSL_CMP_SRV_certConf_cb_t process_certConf, 78 OSSL_CMP_SRV_pollReq_cb_t process_pollReq) 79 { 80 if (srv_ctx == NULL) { 81 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 82 return 0; 83 } 84 srv_ctx->custom_ctx = custom_ctx; 85 srv_ctx->process_cert_request = process_cert_request; 86 srv_ctx->process_rr = process_rr; 87 srv_ctx->process_genm = process_genm; 88 srv_ctx->process_error = process_error; 89 srv_ctx->process_certConf = process_certConf; 90 srv_ctx->process_pollReq = process_pollReq; 91 return 1; 92 } 93 94 int OSSL_CMP_SRV_CTX_init_trans(OSSL_CMP_SRV_CTX *srv_ctx, 95 OSSL_CMP_SRV_delayed_delivery_cb_t delay, 96 OSSL_CMP_SRV_clean_transaction_cb_t clean) 97 { 98 if (srv_ctx == NULL) { 99 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 100 return 0; 101 } 102 srv_ctx->delayed_delivery = delay; 103 srv_ctx->clean_transaction = clean; 104 return 1; 105 } 106 107 OSSL_CMP_CTX *OSSL_CMP_SRV_CTX_get0_cmp_ctx(const OSSL_CMP_SRV_CTX *srv_ctx) 108 { 109 if (srv_ctx == NULL) { 110 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 111 return NULL; 112 } 113 return srv_ctx->ctx; 114 } 115 116 void *OSSL_CMP_SRV_CTX_get0_custom_ctx(const OSSL_CMP_SRV_CTX *srv_ctx) 117 { 118 if (srv_ctx == NULL) { 119 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 120 return NULL; 121 } 122 return srv_ctx->custom_ctx; 123 } 124 125 int OSSL_CMP_SRV_CTX_set_send_unprotected_errors(OSSL_CMP_SRV_CTX *srv_ctx, 126 int val) 127 { 128 if (srv_ctx == NULL) { 129 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 130 return 0; 131 } 132 srv_ctx->sendUnprotectedErrors = val != 0; 133 return 1; 134 } 135 136 int OSSL_CMP_SRV_CTX_set_accept_unprotected(OSSL_CMP_SRV_CTX *srv_ctx, int val) 137 { 138 if (srv_ctx == NULL) { 139 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 140 return 0; 141 } 142 srv_ctx->acceptUnprotected = val != 0; 143 return 1; 144 } 145 146 int OSSL_CMP_SRV_CTX_set_accept_raverified(OSSL_CMP_SRV_CTX *srv_ctx, int val) 147 { 148 if (srv_ctx == NULL) { 149 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 150 return 0; 151 } 152 srv_ctx->acceptRAVerified = val != 0; 153 return 1; 154 } 155 156 int OSSL_CMP_SRV_CTX_set_grant_implicit_confirm(OSSL_CMP_SRV_CTX *srv_ctx, 157 int val) 158 { 159 if (srv_ctx == NULL) { 160 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 161 return 0; 162 } 163 srv_ctx->grantImplicitConfirm = val != 0; 164 return 1; 165 } 166 167 /* return error msg with waiting status if polling is initiated, else NULL */ 168 static OSSL_CMP_MSG *delayed_delivery(OSSL_CMP_SRV_CTX *srv_ctx, 169 const OSSL_CMP_MSG *req) 170 { 171 int ret; 172 unsigned long err; 173 int status = OSSL_CMP_PKISTATUS_waiting, 174 fail_info = 0, errorCode = 0; 175 const char *txt = NULL, *details = NULL; 176 OSSL_CMP_PKISI *si; 177 OSSL_CMP_MSG *msg; 178 179 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL 180 && srv_ctx->delayed_delivery != NULL)) 181 return NULL; 182 183 ret = srv_ctx->delayed_delivery(srv_ctx, req); 184 if (ret == 0) 185 return NULL; 186 if (ret == 1) { 187 srv_ctx->polling = 1; 188 } else { 189 status = OSSL_CMP_PKISTATUS_rejection; 190 fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_systemFailure; 191 txt = "server application error"; 192 err = ERR_peek_error(); 193 errorCode = ERR_GET_REASON(err); 194 details = ERR_reason_error_string(err); 195 } 196 197 si = OSSL_CMP_STATUSINFO_new(status, fail_info, txt); 198 if (si == NULL) 199 return NULL; 200 201 msg = ossl_cmp_error_new(srv_ctx->ctx, si, errorCode, details, 202 srv_ctx->sendUnprotectedErrors); 203 OSSL_CMP_PKISI_free(si); 204 return msg; 205 } 206 207 /* 208 * Processes an ir/cr/p10cr/kur and returns a certification response. 209 * Only handles the first certification request contained in req 210 * returns an ip/cp/kup on success and NULL on error 211 */ 212 static OSSL_CMP_MSG *process_cert_request(OSSL_CMP_SRV_CTX *srv_ctx, 213 const OSSL_CMP_MSG *req) 214 { 215 OSSL_CMP_MSG *msg = NULL; 216 OSSL_CMP_PKISI *si = NULL; 217 X509 *certOut = NULL; 218 EVP_PKEY *keyOut = NULL; 219 STACK_OF(X509) *chainOut = NULL, *caPubs = NULL; 220 const OSSL_CRMF_MSG *crm = NULL; 221 const X509_REQ *p10cr = NULL; 222 int bodytype; 223 int certReqId, central_keygen; 224 225 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL)) 226 return NULL; 227 228 switch (OSSL_CMP_MSG_get_bodytype(req)) { 229 case OSSL_CMP_PKIBODY_P10CR: 230 case OSSL_CMP_PKIBODY_CR: 231 bodytype = OSSL_CMP_PKIBODY_CP; 232 break; 233 case OSSL_CMP_PKIBODY_IR: 234 bodytype = OSSL_CMP_PKIBODY_IP; 235 break; 236 case OSSL_CMP_PKIBODY_KUR: 237 bodytype = OSSL_CMP_PKIBODY_KUP; 238 break; 239 default: 240 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY); 241 return NULL; 242 } 243 244 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_P10CR) { 245 certReqId = OSSL_CMP_CERTREQID_NONE; /* p10cr does not include an Id */ 246 p10cr = req->body->value.p10cr; 247 } else { 248 OSSL_CRMF_MSGS *reqs = req->body->value.ir; /* same for cr and kur */ 249 250 if (sk_OSSL_CRMF_MSG_num(reqs) != 1) { 251 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED); 252 return NULL; 253 } 254 if ((crm = sk_OSSL_CRMF_MSG_value(reqs, 0)) == NULL) { 255 ERR_raise(ERR_LIB_CMP, CMP_R_CERTREQMSG_NOT_FOUND); 256 return NULL; 257 } 258 certReqId = OSSL_CRMF_MSG_get_certReqId(crm); 259 if (certReqId != OSSL_CMP_CERTREQID) { /* so far, only possible value */ 260 ERR_raise(ERR_LIB_CMP, CMP_R_BAD_REQUEST_ID); 261 return NULL; 262 } 263 } 264 srv_ctx->certReqId = certReqId; 265 266 central_keygen = OSSL_CRMF_MSG_centralkeygen_requested(crm, p10cr); 267 if (central_keygen < 0) 268 return NULL; 269 if (central_keygen == 0 270 && !ossl_cmp_verify_popo(srv_ctx->ctx, req, srv_ctx->acceptRAVerified)) { 271 /* Proof of possession could not be verified */ 272 si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection, 273 1 << OSSL_CMP_PKIFAILUREINFO_badPOP, 274 ERR_reason_error_string(ERR_peek_error())); 275 if (si == NULL) 276 return NULL; 277 } else { 278 OSSL_CMP_PKIHEADER *hdr = OSSL_CMP_MSG_get0_header(req); 279 280 si = srv_ctx->process_cert_request(srv_ctx, req, certReqId, crm, p10cr, 281 &certOut, &chainOut, &caPubs); 282 if (si == NULL) 283 goto err; 284 if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_waiting) 285 srv_ctx->polling = 1; 286 /* set OSSL_CMP_OPT_IMPLICIT_CONFIRM if and only if transaction ends */ 287 if (!OSSL_CMP_CTX_set_option(srv_ctx->ctx, 288 OSSL_CMP_OPT_IMPLICIT_CONFIRM, 289 ossl_cmp_hdr_has_implicitConfirm(hdr) 290 && srv_ctx->grantImplicitConfirm 291 /* do not set if polling starts: */ 292 && certOut != NULL)) 293 goto err; 294 if (central_keygen == 1 295 && srv_ctx->ctx->newPkey_priv && srv_ctx->ctx->newPkey != NULL) 296 keyOut = srv_ctx->ctx->newPkey; 297 } 298 299 msg = ossl_cmp_certrep_new(srv_ctx->ctx, bodytype, certReqId, si, 300 certOut, keyOut, NULL /* enc */, chainOut, caPubs, 301 srv_ctx->sendUnprotectedErrors); 302 /* When supporting OSSL_CRMF_POPO_KEYENC, "enc" will need to be set */ 303 if (msg == NULL) 304 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_CERTREP); 305 306 err: 307 OSSL_CMP_PKISI_free(si); 308 X509_free(certOut); 309 OSSL_CMP_CTX_set0_newPkey(srv_ctx->ctx, 0, NULL); 310 OSSL_STACK_OF_X509_free(chainOut); 311 OSSL_STACK_OF_X509_free(caPubs); 312 return msg; 313 } 314 315 static OSSL_CMP_MSG *process_rr(OSSL_CMP_SRV_CTX *srv_ctx, 316 const OSSL_CMP_MSG *req) 317 { 318 OSSL_CMP_MSG *msg = NULL; 319 OSSL_CMP_REVDETAILS *details; 320 OSSL_CRMF_CERTID *certId = NULL; 321 OSSL_CRMF_CERTTEMPLATE *tmpl; 322 const X509_NAME *issuer; 323 const ASN1_INTEGER *serial; 324 OSSL_CMP_PKISI *si; 325 326 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL)) 327 return NULL; 328 329 if (sk_OSSL_CMP_REVDETAILS_num(req->body->value.rr) != 1) { 330 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED); 331 return NULL; 332 } 333 details = sk_OSSL_CMP_REVDETAILS_value(req->body->value.rr, 0); 334 if (details == NULL) { 335 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE); 336 return NULL; 337 } 338 339 tmpl = details->certDetails; 340 issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl); 341 serial = OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl); 342 if (issuer != NULL && serial != NULL 343 && (certId = OSSL_CRMF_CERTID_gen(issuer, serial)) == NULL) 344 return NULL; 345 if ((si = srv_ctx->process_rr(srv_ctx, req, issuer, serial)) == NULL) 346 goto err; 347 348 if ((msg = ossl_cmp_rp_new(srv_ctx->ctx, si, certId, 349 srv_ctx->sendUnprotectedErrors)) 350 == NULL) 351 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_RR); 352 353 err: 354 OSSL_CRMF_CERTID_free(certId); 355 OSSL_CMP_PKISI_free(si); 356 return msg; 357 } 358 359 /* 360 * Processes genm and creates a genp message mirroring the contents of the 361 * incoming message 362 */ 363 static OSSL_CMP_MSG *process_genm(OSSL_CMP_SRV_CTX *srv_ctx, 364 const OSSL_CMP_MSG *req) 365 { 366 OSSL_CMP_GENMSGCONTENT *itavs; 367 OSSL_CMP_MSG *msg; 368 369 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL)) 370 return NULL; 371 372 if (!srv_ctx->process_genm(srv_ctx, req, req->body->value.genm, &itavs)) 373 return NULL; 374 375 msg = ossl_cmp_genp_new(srv_ctx->ctx, itavs); 376 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free); 377 return msg; 378 } 379 380 static OSSL_CMP_MSG *process_error(OSSL_CMP_SRV_CTX *srv_ctx, 381 const OSSL_CMP_MSG *req) 382 { 383 OSSL_CMP_ERRORMSGCONTENT *errorContent; 384 OSSL_CMP_MSG *msg; 385 386 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL)) 387 return NULL; 388 errorContent = req->body->value.error; 389 srv_ctx->process_error(srv_ctx, req, errorContent->pKIStatusInfo, 390 errorContent->errorCode, errorContent->errorDetails); 391 392 if ((msg = ossl_cmp_pkiconf_new(srv_ctx->ctx)) == NULL) 393 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_PKICONF); 394 return msg; 395 } 396 397 static OSSL_CMP_MSG *process_certConf(OSSL_CMP_SRV_CTX *srv_ctx, 398 const OSSL_CMP_MSG *req) 399 { 400 OSSL_CMP_CTX *ctx; 401 OSSL_CMP_CERTCONFIRMCONTENT *ccc; 402 int num; 403 OSSL_CMP_MSG *msg = NULL; 404 OSSL_CMP_CERTSTATUS *status = NULL; 405 406 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL)) 407 return NULL; 408 409 ctx = srv_ctx->ctx; 410 ccc = req->body->value.certConf; 411 num = sk_OSSL_CMP_CERTSTATUS_num(ccc); 412 413 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 1 414 || ctx->status != OSSL_CMP_PKISTATUS_trans) { 415 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_UNEXPECTED_CERTCONF); 416 return NULL; 417 } 418 419 if (num == 0) { 420 ossl_cmp_err(ctx, "certificate rejected by client"); 421 } else { 422 if (num > 1) 423 ossl_cmp_warn(ctx, "All CertStatus but the first will be ignored"); 424 status = sk_OSSL_CMP_CERTSTATUS_value(ccc, 0); 425 } 426 427 if (status != NULL) { 428 int certReqId = ossl_cmp_asn1_get_int(status->certReqId); 429 ASN1_OCTET_STRING *certHash = status->certHash; 430 OSSL_CMP_PKISI *si = status->statusInfo; 431 432 if (certReqId != srv_ctx->certReqId) { 433 ERR_raise(ERR_LIB_CMP, CMP_R_BAD_REQUEST_ID); 434 return NULL; 435 } 436 if (!srv_ctx->process_certConf(srv_ctx, req, certReqId, certHash, si)) 437 return NULL; /* reason code may be: CMP_R_CERTHASH_UNMATCHED */ 438 439 if (si != NULL 440 && ossl_cmp_pkisi_get_status(si) != OSSL_CMP_PKISTATUS_accepted) { 441 int pki_status = ossl_cmp_pkisi_get_status(si); 442 const char *str = ossl_cmp_PKIStatus_to_string(pki_status); 443 444 ossl_cmp_log2(INFO, ctx, "certificate rejected by client %s %s", 445 str == NULL ? "without" : "with", 446 str == NULL ? "PKIStatus" : str); 447 } 448 } 449 450 if ((msg = ossl_cmp_pkiconf_new(ctx)) == NULL) 451 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_PKICONF); 452 return msg; 453 } 454 455 /* pollReq is handled separately, to avoid recursive call */ 456 static OSSL_CMP_MSG *process_non_polling_request(OSSL_CMP_SRV_CTX *srv_ctx, 457 const OSSL_CMP_MSG *req) 458 { 459 OSSL_CMP_MSG *rsp = NULL; 460 461 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL 462 && req->body != NULL)) 463 return NULL; 464 465 switch (OSSL_CMP_MSG_get_bodytype(req)) { 466 case OSSL_CMP_PKIBODY_IR: 467 case OSSL_CMP_PKIBODY_CR: 468 case OSSL_CMP_PKIBODY_P10CR: 469 case OSSL_CMP_PKIBODY_KUR: 470 if (srv_ctx->process_cert_request == NULL) 471 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 472 else 473 rsp = process_cert_request(srv_ctx, req); 474 break; 475 case OSSL_CMP_PKIBODY_RR: 476 if (srv_ctx->process_rr == NULL) 477 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 478 else 479 rsp = process_rr(srv_ctx, req); 480 break; 481 case OSSL_CMP_PKIBODY_GENM: 482 if (srv_ctx->process_genm == NULL) 483 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 484 else 485 rsp = process_genm(srv_ctx, req); 486 break; 487 case OSSL_CMP_PKIBODY_ERROR: 488 if (srv_ctx->process_error == NULL) 489 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 490 else 491 rsp = process_error(srv_ctx, req); 492 break; 493 case OSSL_CMP_PKIBODY_CERTCONF: 494 if (srv_ctx->process_certConf == NULL) 495 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 496 else 497 rsp = process_certConf(srv_ctx, req); 498 break; 499 500 case OSSL_CMP_PKIBODY_POLLREQ: 501 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY); 502 break; 503 default: 504 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 505 break; 506 } 507 508 return rsp; 509 } 510 511 static OSSL_CMP_MSG *process_pollReq(OSSL_CMP_SRV_CTX *srv_ctx, 512 const OSSL_CMP_MSG *req) 513 { 514 OSSL_CMP_POLLREQCONTENT *prc; 515 OSSL_CMP_POLLREQ *pr; 516 int certReqId; 517 OSSL_CMP_MSG *orig_req; 518 int64_t check_after = 0; 519 OSSL_CMP_MSG *msg = NULL; 520 521 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL)) 522 return NULL; 523 524 if (!srv_ctx->polling) { 525 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY); 526 return NULL; 527 } 528 529 prc = req->body->value.pollReq; 530 if (sk_OSSL_CMP_POLLREQ_num(prc) != 1) { 531 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED); 532 return NULL; 533 } 534 535 pr = sk_OSSL_CMP_POLLREQ_value(prc, 0); 536 certReqId = ossl_cmp_asn1_get_int(pr->certReqId); 537 if (!srv_ctx->process_pollReq(srv_ctx, req, certReqId, 538 &orig_req, &check_after)) 539 return NULL; 540 541 if (orig_req != NULL) { 542 srv_ctx->polling = 0; 543 msg = process_non_polling_request(srv_ctx, orig_req); 544 OSSL_CMP_MSG_free(orig_req); 545 } else { 546 if ((msg = ossl_cmp_pollRep_new(srv_ctx->ctx, certReqId, 547 check_after)) 548 == NULL) 549 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_POLLREP); 550 } 551 return msg; 552 } 553 554 /* 555 * Determine whether missing/invalid protection of request message is allowed. 556 * Return 1 on acceptance, 0 on rejection, or -1 on (internal) error. 557 */ 558 static int unprotected_exception(const OSSL_CMP_CTX *ctx, 559 const OSSL_CMP_MSG *req, 560 int invalid_protection, 561 int accept_unprotected_requests) 562 { 563 if (!ossl_assert(ctx != NULL && req != NULL)) 564 return -1; 565 566 if (accept_unprotected_requests) { 567 ossl_cmp_log1(WARN, ctx, "ignoring %s protection of request message", 568 invalid_protection ? "invalid" : "missing"); 569 return 1; 570 } 571 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_ERROR 572 && OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_UNPROTECTED_ERRORS) == 1) { 573 ossl_cmp_warn(ctx, "ignoring missing protection of error message"); 574 return 1; 575 } 576 return 0; 577 } 578 579 static int assuming_new_transaction(OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *req) 580 { 581 int body_type = OSSL_CMP_MSG_get_bodytype(req); 582 ASN1_OCTET_STRING *tid; 583 584 if (ctx->transactionID == NULL) /* no currently active transaction */ 585 return 1; 586 587 tid = OSSL_CMP_HDR_get0_transactionID(OSSL_CMP_MSG_get0_header(req)); 588 if (tid != NULL && ASN1_OCTET_STRING_cmp(tid, ctx->transactionID) != 0) { 589 char *ctx_str = i2s_ASN1_OCTET_STRING(NULL, ctx->transactionID); 590 char *tid_str = i2s_ASN1_OCTET_STRING(NULL, tid); 591 592 ossl_cmp_log2(WARN, ctx, "Assuming that last transaction with ID=%s got aborted, new ID=%s", 593 ctx_str != NULL ? ctx_str : "(null)", 594 tid_str != NULL ? tid_str : "(null)"); 595 OPENSSL_free(tid_str); 596 OPENSSL_free(ctx_str); 597 return 1; 598 } 599 600 switch (body_type) { 601 case OSSL_CMP_PKIBODY_IR: 602 case OSSL_CMP_PKIBODY_CR: 603 case OSSL_CMP_PKIBODY_P10CR: 604 case OSSL_CMP_PKIBODY_KUR: 605 case OSSL_CMP_PKIBODY_RR: 606 case OSSL_CMP_PKIBODY_GENM: 607 ossl_cmp_log1(WARN, ctx, "Assuming new transaction due to received body type %s", 608 ossl_cmp_bodytype_to_string(body_type)); 609 return 1; 610 default: 611 return 0; 612 } 613 } 614 615 /* Prepare for next transaction */ 616 static int transaction_reinit(OSSL_CMP_SRV_CTX *srv_ctx) 617 { 618 int ret = 1; 619 620 srv_ctx->ctx->status = OSSL_CMP_PKISTATUS_unspecified; /* transaction closed */ 621 srv_ctx->certReqId = OSSL_CMP_CERTREQID_INVALID; 622 srv_ctx->polling = 0; 623 624 if (srv_ctx->clean_transaction != NULL) 625 ret = srv_ctx->clean_transaction(srv_ctx, srv_ctx->ctx->transactionID); 626 if (!OSSL_CMP_CTX_set1_transactionID(srv_ctx->ctx, NULL)) 627 ret = 0; 628 if (!OSSL_CMP_CTX_set1_senderNonce(srv_ctx->ctx, NULL)) 629 ret = 0; 630 return ret; 631 } 632 633 /* 634 * returns created message and NULL on internal error 635 */ 636 OSSL_CMP_MSG *OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX *srv_ctx, 637 const OSSL_CMP_MSG *req) 638 { 639 OSSL_CMP_CTX *ctx; 640 ASN1_OCTET_STRING *backup_secret; 641 OSSL_CMP_PKIHEADER *hdr; 642 int req_type, rsp_type; 643 int req_verified = 0; 644 OSSL_CMP_MSG *rsp = NULL; 645 646 if (srv_ctx == NULL || srv_ctx->ctx == NULL 647 || req == NULL || req->body == NULL 648 || (hdr = OSSL_CMP_MSG_get0_header(req)) == NULL) { 649 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 650 return 0; 651 } 652 ctx = srv_ctx->ctx; 653 backup_secret = ctx->secretValue; 654 req_type = OSSL_CMP_MSG_get_bodytype(req); 655 ossl_cmp_log1(DEBUG, ctx, 656 "received %s", ossl_cmp_bodytype_to_string(req_type)); 657 658 /* 659 * Some things need to be done already before validating the message in 660 * order to be able to send an error message as far as needed and possible. 661 */ 662 if (hdr->sender->type != GEN_DIRNAME) { 663 ERR_raise(ERR_LIB_CMP, CMP_R_SENDER_GENERALNAME_TYPE_NOT_SUPPORTED); 664 goto err; 665 } 666 if (!OSSL_CMP_CTX_set1_recipient(ctx, hdr->sender->d.directoryName)) 667 goto err; 668 669 if (assuming_new_transaction(ctx, req)) { 670 /* 671 * Start of a new transaction, resetting transactionID and senderNonce. 672 * Must in this case reset transactionID beforehand such that the clean() 673 * callback function gets a NULL transactionID argument, as documented. 674 */ 675 (void)OSSL_CMP_CTX_set1_transactionID(ctx, NULL); 676 if (!transaction_reinit(srv_ctx)) { 677 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE); 678 goto err; 679 } 680 } else { 681 /* transactionID should be already initialized */ 682 if (ctx->transactionID == NULL) { 683 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION 684 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY); 685 goto err; 686 #endif 687 } 688 if (srv_ctx->polling && req_type != OSSL_CMP_PKIBODY_POLLREQ 689 && req_type != OSSL_CMP_PKIBODY_ERROR) { 690 ERR_raise(ERR_LIB_CMP, CMP_R_EXPECTED_POLLREQ); 691 goto err; 692 } 693 } 694 695 req_verified = ossl_cmp_msg_check_update(ctx, req, unprotected_exception, 696 srv_ctx->acceptUnprotected); 697 if (ctx->secretValue != NULL && ctx->pkey != NULL 698 && ossl_cmp_hdr_get_protection_nid(hdr) != NID_id_PasswordBasedMAC) 699 ctx->secretValue = NULL; /* use MSG_SIG_ALG when protecting rsp */ 700 if (!req_verified) 701 goto err; 702 703 if (req_type == OSSL_CMP_PKIBODY_POLLREQ) { 704 if (srv_ctx->process_pollReq == NULL) 705 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY); 706 else 707 rsp = process_pollReq(srv_ctx, req); 708 } else { 709 if (srv_ctx->delayed_delivery != NULL 710 && (rsp = delayed_delivery(srv_ctx, req)) != NULL) { 711 goto err; 712 } 713 rsp = process_non_polling_request(srv_ctx, req); 714 } 715 716 err: 717 if (rsp == NULL) { 718 /* on error, try to respond with CMP error message to client */ 719 const char *data = NULL, *reason = NULL; 720 int flags = 0; 721 unsigned long err = ERR_peek_error_data(&data, &flags); 722 int fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_badRequest; 723 /* fail_info is not very specific */ 724 OSSL_CMP_PKISI *si = NULL; 725 726 if (!req_verified) { 727 /* 728 * Above ossl_cmp_msg_check_update() was not successfully executed, 729 * which normally would set ctx->transactionID and ctx->recipNonce. 730 * So anyway try to provide the right transactionID and recipNonce, 731 * while ignoring any (extra) error in next two function calls. 732 */ 733 if (ctx->transactionID == NULL) 734 (void)OSSL_CMP_CTX_set1_transactionID(ctx, hdr->transactionID); 735 (void)ossl_cmp_ctx_set1_recipNonce(ctx, hdr->senderNonce); 736 } 737 738 if ((flags & ERR_TXT_STRING) == 0 || *data == '\0') 739 data = NULL; 740 reason = ERR_reason_error_string(err); 741 if ((si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection, 742 fail_info, reason)) 743 != NULL) { 744 rsp = ossl_cmp_error_new(srv_ctx->ctx, si, err, 745 data, srv_ctx->sendUnprotectedErrors); 746 OSSL_CMP_PKISI_free(si); 747 } 748 } 749 OSSL_CMP_CTX_print_errors(ctx); 750 ctx->secretValue = backup_secret; 751 752 rsp_type = rsp != NULL ? OSSL_CMP_MSG_get_bodytype(rsp) : OSSL_CMP_PKIBODY_ERROR; 753 if (rsp != NULL) 754 ossl_cmp_log1(DEBUG, ctx, 755 "sending %s", ossl_cmp_bodytype_to_string(rsp_type)); 756 else 757 ossl_cmp_log(ERR, ctx, "cannot send proper CMP response"); 758 759 /* determine whether to keep the transaction open or not */ 760 ctx->status = OSSL_CMP_PKISTATUS_trans; 761 switch (rsp_type) { 762 case OSSL_CMP_PKIBODY_IP: 763 case OSSL_CMP_PKIBODY_CP: 764 case OSSL_CMP_PKIBODY_KUP: 765 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 0) 766 break; 767 /* fall through */ 768 769 case OSSL_CMP_PKIBODY_ERROR: 770 if (rsp != NULL && ossl_cmp_is_error_with_waiting(rsp)) 771 break; 772 /* fall through */ 773 774 case OSSL_CMP_PKIBODY_RP: 775 case OSSL_CMP_PKIBODY_PKICONF: 776 case OSSL_CMP_PKIBODY_GENP: 777 /* Other terminating response message types are not supported */ 778 779 /* Prepare for next transaction, ignoring any errors here */ 780 (void)transaction_reinit(srv_ctx); 781 782 default: /* not closing transaction in other cases */ 783 break; 784 } 785 return rsp; 786 } 787 788 /* 789 * Server interface that may substitute OSSL_CMP_MSG_http_perform at the client. 790 * The OSSL_CMP_SRV_CTX must be set as client_ctx->transfer_cb_arg. 791 * returns received message on success, else NULL and pushes an element on the 792 * error stack. 793 */ 794 OSSL_CMP_MSG *OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX *client_ctx, 795 const OSSL_CMP_MSG *req) 796 { 797 OSSL_CMP_SRV_CTX *srv_ctx = NULL; 798 799 if (client_ctx == NULL || req == NULL) { 800 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT); 801 return NULL; 802 } 803 804 if ((srv_ctx = OSSL_CMP_CTX_get_transfer_cb_arg(client_ctx)) == NULL) { 805 ERR_raise(ERR_LIB_CMP, CMP_R_TRANSFER_ERROR); 806 return NULL; 807 } 808 809 return OSSL_CMP_SRV_process_request(srv_ctx, req); 810 } 811