1 /*
2 * Copyright 2007-2025 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
OSSL_CMP_SRV_CTX_free(OSSL_CMP_SRV_CTX * srv_ctx)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
OSSL_CMP_SRV_CTX_new(OSSL_LIB_CTX * libctx,const char * propq)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 ctx->polling = 0;
65
66 /* all other elements are initialized to 0 or NULL, respectively */
67 return ctx;
68 err:
69 OSSL_CMP_SRV_CTX_free(ctx);
70 return NULL;
71 }
72
OSSL_CMP_SRV_CTX_init(OSSL_CMP_SRV_CTX * srv_ctx,void * custom_ctx,OSSL_CMP_SRV_cert_request_cb_t process_cert_request,OSSL_CMP_SRV_rr_cb_t process_rr,OSSL_CMP_SRV_genm_cb_t process_genm,OSSL_CMP_SRV_error_cb_t process_error,OSSL_CMP_SRV_certConf_cb_t process_certConf,OSSL_CMP_SRV_pollReq_cb_t process_pollReq)73 int OSSL_CMP_SRV_CTX_init(OSSL_CMP_SRV_CTX *srv_ctx, void *custom_ctx,
74 OSSL_CMP_SRV_cert_request_cb_t process_cert_request,
75 OSSL_CMP_SRV_rr_cb_t process_rr,
76 OSSL_CMP_SRV_genm_cb_t process_genm,
77 OSSL_CMP_SRV_error_cb_t process_error,
78 OSSL_CMP_SRV_certConf_cb_t process_certConf,
79 OSSL_CMP_SRV_pollReq_cb_t process_pollReq)
80 {
81 if (srv_ctx == NULL) {
82 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
83 return 0;
84 }
85 srv_ctx->custom_ctx = custom_ctx;
86 srv_ctx->process_cert_request = process_cert_request;
87 srv_ctx->process_rr = process_rr;
88 srv_ctx->process_genm = process_genm;
89 srv_ctx->process_error = process_error;
90 srv_ctx->process_certConf = process_certConf;
91 srv_ctx->process_pollReq = process_pollReq;
92 return 1;
93 }
94
OSSL_CMP_SRV_CTX_init_trans(OSSL_CMP_SRV_CTX * srv_ctx,OSSL_CMP_SRV_delayed_delivery_cb_t delay,OSSL_CMP_SRV_clean_transaction_cb_t clean)95 int OSSL_CMP_SRV_CTX_init_trans(OSSL_CMP_SRV_CTX *srv_ctx,
96 OSSL_CMP_SRV_delayed_delivery_cb_t delay,
97 OSSL_CMP_SRV_clean_transaction_cb_t clean)
98 {
99 if (srv_ctx == NULL) {
100 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
101 return 0;
102 }
103 srv_ctx->delayed_delivery = delay;
104 srv_ctx->clean_transaction = clean;
105 return 1;
106 }
107
OSSL_CMP_SRV_CTX_get0_cmp_ctx(const OSSL_CMP_SRV_CTX * srv_ctx)108 OSSL_CMP_CTX *OSSL_CMP_SRV_CTX_get0_cmp_ctx(const OSSL_CMP_SRV_CTX *srv_ctx)
109 {
110 if (srv_ctx == NULL) {
111 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
112 return NULL;
113 }
114 return srv_ctx->ctx;
115 }
116
OSSL_CMP_SRV_CTX_get0_custom_ctx(const OSSL_CMP_SRV_CTX * srv_ctx)117 void *OSSL_CMP_SRV_CTX_get0_custom_ctx(const OSSL_CMP_SRV_CTX *srv_ctx)
118 {
119 if (srv_ctx == NULL) {
120 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
121 return NULL;
122 }
123 return srv_ctx->custom_ctx;
124 }
125
OSSL_CMP_SRV_CTX_set_send_unprotected_errors(OSSL_CMP_SRV_CTX * srv_ctx,int val)126 int OSSL_CMP_SRV_CTX_set_send_unprotected_errors(OSSL_CMP_SRV_CTX *srv_ctx,
127 int val)
128 {
129 if (srv_ctx == NULL) {
130 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
131 return 0;
132 }
133 srv_ctx->sendUnprotectedErrors = val != 0;
134 return 1;
135 }
136
OSSL_CMP_SRV_CTX_set_accept_unprotected(OSSL_CMP_SRV_CTX * srv_ctx,int val)137 int OSSL_CMP_SRV_CTX_set_accept_unprotected(OSSL_CMP_SRV_CTX *srv_ctx, int val)
138 {
139 if (srv_ctx == NULL) {
140 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
141 return 0;
142 }
143 srv_ctx->acceptUnprotected = val != 0;
144 return 1;
145 }
146
OSSL_CMP_SRV_CTX_set_accept_raverified(OSSL_CMP_SRV_CTX * srv_ctx,int val)147 int OSSL_CMP_SRV_CTX_set_accept_raverified(OSSL_CMP_SRV_CTX *srv_ctx, int val)
148 {
149 if (srv_ctx == NULL) {
150 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
151 return 0;
152 }
153 srv_ctx->acceptRAVerified = val != 0;
154 return 1;
155 }
156
OSSL_CMP_SRV_CTX_set_grant_implicit_confirm(OSSL_CMP_SRV_CTX * srv_ctx,int val)157 int OSSL_CMP_SRV_CTX_set_grant_implicit_confirm(OSSL_CMP_SRV_CTX *srv_ctx,
158 int val)
159 {
160 if (srv_ctx == NULL) {
161 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
162 return 0;
163 }
164 srv_ctx->grantImplicitConfirm = val != 0;
165 return 1;
166 }
167
168 /* return error msg with waiting status if polling is initiated, else NULL */
delayed_delivery(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)169 static OSSL_CMP_MSG *delayed_delivery(OSSL_CMP_SRV_CTX *srv_ctx,
170 const OSSL_CMP_MSG *req)
171 {
172 int ret;
173 unsigned long err;
174 int status = OSSL_CMP_PKISTATUS_waiting,
175 fail_info = 0, errorCode = 0;
176 const char *txt = NULL, *details = NULL;
177 OSSL_CMP_PKISI *si;
178 OSSL_CMP_MSG *msg;
179
180 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL
181 && srv_ctx->delayed_delivery != NULL))
182 return NULL;
183
184 ret = srv_ctx->delayed_delivery(srv_ctx, req);
185 if (ret == 0)
186 return NULL;
187 if (ret == 1) {
188 srv_ctx->polling = 1;
189 } else {
190 status = OSSL_CMP_PKISTATUS_rejection;
191 fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_systemFailure;
192 txt = "server application error";
193 err = ERR_peek_error();
194 errorCode = ERR_GET_REASON(err);
195 details = ERR_reason_error_string(err);
196 }
197
198 si = OSSL_CMP_STATUSINFO_new(status, fail_info, txt);
199 if (si == NULL)
200 return NULL;
201
202 msg = ossl_cmp_error_new(srv_ctx->ctx, si, errorCode, details,
203 srv_ctx->sendUnprotectedErrors);
204 OSSL_CMP_PKISI_free(si);
205 return msg;
206 }
207
208 /*
209 * Processes an ir/cr/p10cr/kur and returns a certification response.
210 * Only handles the first certification request contained in req
211 * returns an ip/cp/kup on success and NULL on error
212 */
process_cert_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)213 static OSSL_CMP_MSG *process_cert_request(OSSL_CMP_SRV_CTX *srv_ctx,
214 const OSSL_CMP_MSG *req)
215 {
216 OSSL_CMP_MSG *msg = NULL;
217 OSSL_CMP_PKISI *si = NULL;
218 X509 *certOut = NULL;
219 EVP_PKEY *keyOut = NULL;
220 STACK_OF(X509) *chainOut = NULL, *caPubs = NULL;
221 const OSSL_CRMF_MSG *crm = NULL;
222 const X509_REQ *p10cr = NULL;
223 int bodytype;
224 int certReqId, central_keygen;
225
226 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
227 return NULL;
228
229 switch (OSSL_CMP_MSG_get_bodytype(req)) {
230 case OSSL_CMP_PKIBODY_P10CR:
231 case OSSL_CMP_PKIBODY_CR:
232 bodytype = OSSL_CMP_PKIBODY_CP;
233 break;
234 case OSSL_CMP_PKIBODY_IR:
235 bodytype = OSSL_CMP_PKIBODY_IP;
236 break;
237 case OSSL_CMP_PKIBODY_KUR:
238 bodytype = OSSL_CMP_PKIBODY_KUP;
239 break;
240 default:
241 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
242 return NULL;
243 }
244
245 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_P10CR) {
246 certReqId = OSSL_CMP_CERTREQID_NONE; /* p10cr does not include an Id */
247 p10cr = req->body->value.p10cr;
248 } else {
249 OSSL_CRMF_MSGS *reqs = req->body->value.ir; /* same for cr and kur */
250
251 if (sk_OSSL_CRMF_MSG_num(reqs) != 1) {
252 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
253 return NULL;
254 }
255 if ((crm = sk_OSSL_CRMF_MSG_value(reqs, 0)) == NULL) {
256 ERR_raise(ERR_LIB_CMP, CMP_R_CERTREQMSG_NOT_FOUND);
257 return NULL;
258 }
259 certReqId = OSSL_CRMF_MSG_get_certReqId(crm);
260 if (certReqId != OSSL_CMP_CERTREQID) { /* so far, only possible value */
261 ERR_raise(ERR_LIB_CMP, CMP_R_BAD_REQUEST_ID);
262 return NULL;
263 }
264 }
265 srv_ctx->certReqId = certReqId;
266
267 central_keygen = OSSL_CRMF_MSG_centralkeygen_requested(crm, p10cr);
268 if (central_keygen < 0)
269 return NULL;
270 if (central_keygen == 0
271 && !ossl_cmp_verify_popo(srv_ctx->ctx, req, srv_ctx->acceptRAVerified)) {
272 /* Proof of possession could not be verified */
273 si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection,
274 1 << OSSL_CMP_PKIFAILUREINFO_badPOP,
275 ERR_reason_error_string(ERR_peek_error()));
276 if (si == NULL)
277 return NULL;
278 } else {
279 OSSL_CMP_PKIHEADER *hdr = OSSL_CMP_MSG_get0_header(req);
280
281 si = srv_ctx->process_cert_request(srv_ctx, req, certReqId, crm, p10cr,
282 &certOut, &chainOut, &caPubs);
283 if (si == NULL)
284 goto err;
285 if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_waiting)
286 srv_ctx->polling = 1;
287 /* set OSSL_CMP_OPT_IMPLICIT_CONFIRM if and only if transaction ends */
288 if (!OSSL_CMP_CTX_set_option(srv_ctx->ctx,
289 OSSL_CMP_OPT_IMPLICIT_CONFIRM,
290 ossl_cmp_hdr_has_implicitConfirm(hdr)
291 && srv_ctx->grantImplicitConfirm
292 /* do not set if polling starts: */
293 && certOut != NULL))
294 goto err;
295 if (central_keygen == 1
296 && srv_ctx->ctx->newPkey_priv && srv_ctx->ctx->newPkey != NULL)
297 keyOut = srv_ctx->ctx->newPkey;
298 }
299
300 msg = ossl_cmp_certrep_new(srv_ctx->ctx, bodytype, certReqId, si,
301 certOut, keyOut, NULL /* enc */, chainOut, caPubs,
302 srv_ctx->sendUnprotectedErrors);
303 /* When supporting OSSL_CRMF_POPO_KEYENC, "enc" will need to be set */
304 if (msg == NULL)
305 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_CERTREP);
306
307 err:
308 OSSL_CMP_PKISI_free(si);
309 X509_free(certOut);
310 OSSL_CMP_CTX_set0_newPkey(srv_ctx->ctx, 0, NULL);
311 OSSL_STACK_OF_X509_free(chainOut);
312 OSSL_STACK_OF_X509_free(caPubs);
313 return msg;
314 }
315
process_rr(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)316 static OSSL_CMP_MSG *process_rr(OSSL_CMP_SRV_CTX *srv_ctx,
317 const OSSL_CMP_MSG *req)
318 {
319 OSSL_CMP_MSG *msg = NULL;
320 OSSL_CMP_REVDETAILS *details;
321 OSSL_CRMF_CERTID *certId = NULL;
322 OSSL_CRMF_CERTTEMPLATE *tmpl;
323 const X509_NAME *issuer;
324 const ASN1_INTEGER *serial;
325 OSSL_CMP_PKISI *si;
326
327 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
328 return NULL;
329
330 if (sk_OSSL_CMP_REVDETAILS_num(req->body->value.rr) != 1) {
331 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
332 return NULL;
333 }
334 details = sk_OSSL_CMP_REVDETAILS_value(req->body->value.rr, 0);
335 if (details == NULL) {
336 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE);
337 return NULL;
338 }
339
340 tmpl = details->certDetails;
341 issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl);
342 serial = OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl);
343 if (issuer != NULL && serial != NULL
344 && (certId = OSSL_CRMF_CERTID_gen(issuer, serial)) == NULL)
345 return NULL;
346 if ((si = srv_ctx->process_rr(srv_ctx, req, issuer, serial)) == NULL)
347 goto err;
348
349 if ((msg = ossl_cmp_rp_new(srv_ctx->ctx, si, certId,
350 srv_ctx->sendUnprotectedErrors)) == 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 */
process_genm(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)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
process_error(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)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
process_certConf(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)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 */
process_non_polling_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)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
process_pollReq(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)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)) == NULL)
548 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_POLLREP);
549 }
550 return msg;
551 }
552
553 /*
554 * Determine whether missing/invalid protection of request message is allowed.
555 * Return 1 on acceptance, 0 on rejection, or -1 on (internal) error.
556 */
unprotected_exception(const OSSL_CMP_CTX * ctx,const OSSL_CMP_MSG * req,int invalid_protection,int accept_unprotected_requests)557 static int unprotected_exception(const OSSL_CMP_CTX *ctx,
558 const OSSL_CMP_MSG *req,
559 int invalid_protection,
560 int accept_unprotected_requests)
561 {
562 if (!ossl_assert(ctx != NULL && req != NULL))
563 return -1;
564
565 if (accept_unprotected_requests) {
566 ossl_cmp_log1(WARN, ctx, "ignoring %s protection of request message",
567 invalid_protection ? "invalid" : "missing");
568 return 1;
569 }
570 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_ERROR
571 && OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_UNPROTECTED_ERRORS) == 1) {
572 ossl_cmp_warn(ctx, "ignoring missing protection of error message");
573 return 1;
574 }
575 return 0;
576 }
577
578 /*
579 * returns created message and NULL on internal error
580 */
OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)581 OSSL_CMP_MSG *OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX *srv_ctx,
582 const OSSL_CMP_MSG *req)
583 {
584 OSSL_CMP_CTX *ctx;
585 ASN1_OCTET_STRING *backup_secret;
586 OSSL_CMP_PKIHEADER *hdr;
587 int req_type, rsp_type;
588 int req_verified = 0;
589 OSSL_CMP_MSG *rsp = NULL;
590
591 if (srv_ctx == NULL || srv_ctx->ctx == NULL
592 || req == NULL || req->body == NULL
593 || (hdr = OSSL_CMP_MSG_get0_header(req)) == NULL) {
594 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
595 return 0;
596 }
597 ctx = srv_ctx->ctx;
598 backup_secret = ctx->secretValue;
599 req_type = OSSL_CMP_MSG_get_bodytype(req);
600 ossl_cmp_log1(DEBUG, ctx,
601 "received %s", ossl_cmp_bodytype_to_string(req_type));
602
603 /*
604 * Some things need to be done already before validating the message in
605 * order to be able to send an error message as far as needed and possible.
606 */
607 if (hdr->sender->type != GEN_DIRNAME) {
608 ERR_raise(ERR_LIB_CMP, CMP_R_SENDER_GENERALNAME_TYPE_NOT_SUPPORTED);
609 goto err;
610 }
611 if (!OSSL_CMP_CTX_set1_recipient(ctx, hdr->sender->d.directoryName))
612 goto err;
613
614 if (srv_ctx->polling && req_type != OSSL_CMP_PKIBODY_POLLREQ
615 && req_type != OSSL_CMP_PKIBODY_ERROR) {
616 ERR_raise(ERR_LIB_CMP, CMP_R_EXPECTED_POLLREQ);
617 goto err;
618 }
619
620 switch (req_type) {
621 case OSSL_CMP_PKIBODY_IR:
622 case OSSL_CMP_PKIBODY_CR:
623 case OSSL_CMP_PKIBODY_P10CR:
624 case OSSL_CMP_PKIBODY_KUR:
625 case OSSL_CMP_PKIBODY_RR:
626 case OSSL_CMP_PKIBODY_GENM:
627 case OSSL_CMP_PKIBODY_ERROR:
628 if (ctx->transactionID != NULL) {
629 char *tid = i2s_ASN1_OCTET_STRING(NULL, ctx->transactionID);
630
631 if (tid != NULL)
632 ossl_cmp_log1(WARN, ctx,
633 "Assuming that last transaction with ID=%s got aborted",
634 tid);
635 OPENSSL_free(tid);
636 }
637 /* start of a new transaction, reset transactionID and senderNonce */
638 if (!OSSL_CMP_CTX_set1_transactionID(ctx, NULL)
639 || !OSSL_CMP_CTX_set1_senderNonce(ctx, NULL))
640 goto err;
641
642 if (srv_ctx->clean_transaction != NULL
643 && !srv_ctx->clean_transaction(srv_ctx, NULL)) {
644 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE);
645 goto err;
646 }
647
648 break;
649 default:
650 /* transactionID should be already initialized */
651 if (ctx->transactionID == NULL) {
652 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
653 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
654 goto err;
655 #endif
656 }
657 }
658
659 req_verified = ossl_cmp_msg_check_update(ctx, req, unprotected_exception,
660 srv_ctx->acceptUnprotected);
661 if (ctx->secretValue != NULL && ctx->pkey != NULL
662 && ossl_cmp_hdr_get_protection_nid(hdr) != NID_id_PasswordBasedMAC)
663 ctx->secretValue = NULL; /* use MSG_SIG_ALG when protecting rsp */
664 if (!req_verified)
665 goto err;
666
667 if (req_type == OSSL_CMP_PKIBODY_POLLREQ) {
668 if (srv_ctx->process_pollReq == NULL)
669 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
670 else
671 rsp = process_pollReq(srv_ctx, req);
672 } else {
673 if (srv_ctx->delayed_delivery != NULL
674 && (rsp = delayed_delivery(srv_ctx, req)) != NULL) {
675 goto err;
676 }
677 rsp = process_non_polling_request(srv_ctx, req);
678 }
679
680 err:
681 if (rsp == NULL) {
682 /* on error, try to respond with CMP error message to client */
683 const char *data = NULL, *reason = NULL;
684 int flags = 0;
685 unsigned long err = ERR_peek_error_data(&data, &flags);
686 int fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_badRequest;
687 /* fail_info is not very specific */
688 OSSL_CMP_PKISI *si = NULL;
689
690 if (!req_verified) {
691 /*
692 * Above ossl_cmp_msg_check_update() was not successfully executed,
693 * which normally would set ctx->transactionID and ctx->recipNonce.
694 * So anyway try to provide the right transactionID and recipNonce,
695 * while ignoring any (extra) error in next two function calls.
696 */
697 if (ctx->transactionID == NULL)
698 (void)OSSL_CMP_CTX_set1_transactionID(ctx, hdr->transactionID);
699 (void)ossl_cmp_ctx_set1_recipNonce(ctx, hdr->senderNonce);
700 }
701
702 if ((flags & ERR_TXT_STRING) == 0 || *data == '\0')
703 data = NULL;
704 reason = ERR_reason_error_string(err);
705 if ((si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection,
706 fail_info, reason)) != NULL) {
707 rsp = ossl_cmp_error_new(srv_ctx->ctx, si, err,
708 data, srv_ctx->sendUnprotectedErrors);
709 OSSL_CMP_PKISI_free(si);
710 }
711 }
712 OSSL_CMP_CTX_print_errors(ctx);
713 ctx->secretValue = backup_secret;
714
715 rsp_type =
716 rsp != NULL ? OSSL_CMP_MSG_get_bodytype(rsp) : OSSL_CMP_PKIBODY_ERROR;
717 if (rsp != NULL)
718 ossl_cmp_log1(DEBUG, ctx,
719 "sending %s", ossl_cmp_bodytype_to_string(rsp_type));
720 else
721 ossl_cmp_log(ERR, ctx, "cannot send proper CMP response");
722
723 /* determine whether to keep the transaction open or not */
724 ctx->status = OSSL_CMP_PKISTATUS_trans;
725 switch (rsp_type) {
726 case OSSL_CMP_PKIBODY_IP:
727 case OSSL_CMP_PKIBODY_CP:
728 case OSSL_CMP_PKIBODY_KUP:
729 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 0)
730 break;
731 /* fall through */
732
733 case OSSL_CMP_PKIBODY_ERROR:
734 if (rsp != NULL && ossl_cmp_is_error_with_waiting(rsp))
735 break;
736 /* fall through */
737
738 case OSSL_CMP_PKIBODY_RP:
739 case OSSL_CMP_PKIBODY_PKICONF:
740 case OSSL_CMP_PKIBODY_GENP:
741 /* Other terminating response message types are not supported */
742 srv_ctx->certReqId = OSSL_CMP_CERTREQID_INVALID;
743 /* Prepare for next transaction, ignoring any errors here: */
744 if (srv_ctx->clean_transaction != NULL)
745 (void)srv_ctx->clean_transaction(srv_ctx, ctx->transactionID);
746 (void)OSSL_CMP_CTX_set1_transactionID(ctx, NULL);
747 (void)OSSL_CMP_CTX_set1_senderNonce(ctx, NULL);
748 ctx->status = OSSL_CMP_PKISTATUS_unspecified; /* transaction closed */
749
750 default: /* not closing transaction in other cases */
751 break;
752 }
753 return rsp;
754 }
755
756 /*
757 * Server interface that may substitute OSSL_CMP_MSG_http_perform at the client.
758 * The OSSL_CMP_SRV_CTX must be set as client_ctx->transfer_cb_arg.
759 * returns received message on success, else NULL and pushes an element on the
760 * error stack.
761 */
OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX * client_ctx,const OSSL_CMP_MSG * req)762 OSSL_CMP_MSG *OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX *client_ctx,
763 const OSSL_CMP_MSG *req)
764 {
765 OSSL_CMP_SRV_CTX *srv_ctx = NULL;
766
767 if (client_ctx == NULL || req == NULL) {
768 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
769 return NULL;
770 }
771
772 if ((srv_ctx = OSSL_CMP_CTX_get_transfer_cb_arg(client_ctx)) == NULL) {
773 ERR_raise(ERR_LIB_CMP, CMP_R_TRANSFER_ERROR);
774 return NULL;
775 }
776
777 return OSSL_CMP_SRV_process_request(srv_ctx, req);
778 }
779