1 /*
2 * Copyright 2007-2024 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 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;
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 if (!ossl_cmp_verify_popo(srv_ctx->ctx, req, srv_ctx->acceptRAVerified)) {
267 /* Proof of possession could not be verified */
268 si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection,
269 1 << OSSL_CMP_PKIFAILUREINFO_badPOP,
270 ERR_reason_error_string(ERR_peek_error()));
271 if (si == NULL)
272 return NULL;
273 } else {
274 OSSL_CMP_PKIHEADER *hdr = OSSL_CMP_MSG_get0_header(req);
275
276 si = srv_ctx->process_cert_request(srv_ctx, req, certReqId, crm, p10cr,
277 &certOut, &chainOut, &caPubs);
278 if (si == NULL)
279 goto err;
280 if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_waiting)
281 srv_ctx->polling = 1;
282 /* set OSSL_CMP_OPT_IMPLICIT_CONFIRM if and only if transaction ends */
283 if (!OSSL_CMP_CTX_set_option(srv_ctx->ctx,
284 OSSL_CMP_OPT_IMPLICIT_CONFIRM,
285 ossl_cmp_hdr_has_implicitConfirm(hdr)
286 && srv_ctx->grantImplicitConfirm
287 /* do not set if polling starts: */
288 && certOut != NULL))
289 goto err;
290 }
291
292 msg = ossl_cmp_certrep_new(srv_ctx->ctx, bodytype, certReqId, si,
293 certOut, NULL /* enc */, chainOut, caPubs,
294 srv_ctx->sendUnprotectedErrors);
295 /* When supporting OSSL_CRMF_POPO_KEYENC, "enc" will need to be set */
296 if (msg == NULL)
297 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_CERTREP);
298
299 err:
300 OSSL_CMP_PKISI_free(si);
301 X509_free(certOut);
302 OSSL_STACK_OF_X509_free(chainOut);
303 OSSL_STACK_OF_X509_free(caPubs);
304 return msg;
305 }
306
process_rr(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)307 static OSSL_CMP_MSG *process_rr(OSSL_CMP_SRV_CTX *srv_ctx,
308 const OSSL_CMP_MSG *req)
309 {
310 OSSL_CMP_MSG *msg = NULL;
311 OSSL_CMP_REVDETAILS *details;
312 OSSL_CRMF_CERTID *certId = NULL;
313 OSSL_CRMF_CERTTEMPLATE *tmpl;
314 const X509_NAME *issuer;
315 const ASN1_INTEGER *serial;
316 OSSL_CMP_PKISI *si;
317
318 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
319 return NULL;
320
321 if (sk_OSSL_CMP_REVDETAILS_num(req->body->value.rr) != 1) {
322 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
323 return NULL;
324 }
325 details = sk_OSSL_CMP_REVDETAILS_value(req->body->value.rr, 0);
326 if (details == NULL) {
327 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE);
328 return NULL;
329 }
330
331 tmpl = details->certDetails;
332 issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl);
333 serial = OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl);
334 if (issuer != NULL && serial != NULL
335 && (certId = OSSL_CRMF_CERTID_gen(issuer, serial)) == NULL)
336 return NULL;
337 if ((si = srv_ctx->process_rr(srv_ctx, req, issuer, serial)) == NULL)
338 goto err;
339
340 if ((msg = ossl_cmp_rp_new(srv_ctx->ctx, si, certId,
341 srv_ctx->sendUnprotectedErrors)) == NULL)
342 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_RR);
343
344 err:
345 OSSL_CRMF_CERTID_free(certId);
346 OSSL_CMP_PKISI_free(si);
347 return msg;
348 }
349
350 /*
351 * Processes genm and creates a genp message mirroring the contents of the
352 * incoming message
353 */
process_genm(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)354 static OSSL_CMP_MSG *process_genm(OSSL_CMP_SRV_CTX *srv_ctx,
355 const OSSL_CMP_MSG *req)
356 {
357 OSSL_CMP_GENMSGCONTENT *itavs;
358 OSSL_CMP_MSG *msg;
359
360 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
361 return NULL;
362
363 if (!srv_ctx->process_genm(srv_ctx, req, req->body->value.genm, &itavs))
364 return NULL;
365
366 msg = ossl_cmp_genp_new(srv_ctx->ctx, itavs);
367 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
368 return msg;
369 }
370
process_error(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)371 static OSSL_CMP_MSG *process_error(OSSL_CMP_SRV_CTX *srv_ctx,
372 const OSSL_CMP_MSG *req)
373 {
374 OSSL_CMP_ERRORMSGCONTENT *errorContent;
375 OSSL_CMP_MSG *msg;
376
377 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
378 return NULL;
379 errorContent = req->body->value.error;
380 srv_ctx->process_error(srv_ctx, req, errorContent->pKIStatusInfo,
381 errorContent->errorCode, errorContent->errorDetails);
382
383 if ((msg = ossl_cmp_pkiconf_new(srv_ctx->ctx)) == NULL)
384 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_PKICONF);
385 return msg;
386 }
387
process_certConf(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)388 static OSSL_CMP_MSG *process_certConf(OSSL_CMP_SRV_CTX *srv_ctx,
389 const OSSL_CMP_MSG *req)
390 {
391 OSSL_CMP_CTX *ctx;
392 OSSL_CMP_CERTCONFIRMCONTENT *ccc;
393 int num;
394 OSSL_CMP_MSG *msg = NULL;
395 OSSL_CMP_CERTSTATUS *status = NULL;
396
397 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
398 return NULL;
399
400 ctx = srv_ctx->ctx;
401 ccc = req->body->value.certConf;
402 num = sk_OSSL_CMP_CERTSTATUS_num(ccc);
403
404 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 1
405 || ctx->status != OSSL_CMP_PKISTATUS_trans) {
406 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_UNEXPECTED_CERTCONF);
407 return NULL;
408 }
409
410 if (num == 0) {
411 ossl_cmp_err(ctx, "certificate rejected by client");
412 } else {
413 if (num > 1)
414 ossl_cmp_warn(ctx, "All CertStatus but the first will be ignored");
415 status = sk_OSSL_CMP_CERTSTATUS_value(ccc, 0);
416 }
417
418 if (status != NULL) {
419 int certReqId = ossl_cmp_asn1_get_int(status->certReqId);
420 ASN1_OCTET_STRING *certHash = status->certHash;
421 OSSL_CMP_PKISI *si = status->statusInfo;
422
423 if (certReqId != srv_ctx->certReqId) {
424 ERR_raise(ERR_LIB_CMP, CMP_R_BAD_REQUEST_ID);
425 return NULL;
426 }
427 if (!srv_ctx->process_certConf(srv_ctx, req, certReqId, certHash, si))
428 return NULL; /* reason code may be: CMP_R_CERTHASH_UNMATCHED */
429
430 if (si != NULL
431 && ossl_cmp_pkisi_get_status(si) != OSSL_CMP_PKISTATUS_accepted) {
432 int pki_status = ossl_cmp_pkisi_get_status(si);
433 const char *str = ossl_cmp_PKIStatus_to_string(pki_status);
434
435 ossl_cmp_log2(INFO, ctx, "certificate rejected by client %s %s",
436 str == NULL ? "without" : "with",
437 str == NULL ? "PKIStatus" : str);
438 }
439 }
440
441 if ((msg = ossl_cmp_pkiconf_new(ctx)) == NULL)
442 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_PKICONF);
443 return msg;
444 }
445
446 /* pollReq is handled separately, to avoid recursive call */
process_non_polling_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)447 static OSSL_CMP_MSG *process_non_polling_request(OSSL_CMP_SRV_CTX *srv_ctx,
448 const OSSL_CMP_MSG *req)
449 {
450 OSSL_CMP_MSG *rsp = NULL;
451
452 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL
453 && req->body != NULL))
454 return NULL;
455
456 switch (OSSL_CMP_MSG_get_bodytype(req)) {
457 case OSSL_CMP_PKIBODY_IR:
458 case OSSL_CMP_PKIBODY_CR:
459 case OSSL_CMP_PKIBODY_P10CR:
460 case OSSL_CMP_PKIBODY_KUR:
461 if (srv_ctx->process_cert_request == NULL)
462 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
463 else
464 rsp = process_cert_request(srv_ctx, req);
465 break;
466 case OSSL_CMP_PKIBODY_RR:
467 if (srv_ctx->process_rr == NULL)
468 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
469 else
470 rsp = process_rr(srv_ctx, req);
471 break;
472 case OSSL_CMP_PKIBODY_GENM:
473 if (srv_ctx->process_genm == NULL)
474 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
475 else
476 rsp = process_genm(srv_ctx, req);
477 break;
478 case OSSL_CMP_PKIBODY_ERROR:
479 if (srv_ctx->process_error == NULL)
480 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
481 else
482 rsp = process_error(srv_ctx, req);
483 break;
484 case OSSL_CMP_PKIBODY_CERTCONF:
485 if (srv_ctx->process_certConf == NULL)
486 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
487 else
488 rsp = process_certConf(srv_ctx, req);
489 break;
490
491 case OSSL_CMP_PKIBODY_POLLREQ:
492 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
493 break;
494 default:
495 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
496 break;
497 }
498
499 return rsp;
500 }
501
process_pollReq(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)502 static OSSL_CMP_MSG *process_pollReq(OSSL_CMP_SRV_CTX *srv_ctx,
503 const OSSL_CMP_MSG *req)
504 {
505 OSSL_CMP_POLLREQCONTENT *prc;
506 OSSL_CMP_POLLREQ *pr;
507 int certReqId;
508 OSSL_CMP_MSG *orig_req;
509 int64_t check_after = 0;
510 OSSL_CMP_MSG *msg = NULL;
511
512 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
513 return NULL;
514
515 if (!srv_ctx->polling) {
516 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
517 return NULL;
518 }
519
520 prc = req->body->value.pollReq;
521 if (sk_OSSL_CMP_POLLREQ_num(prc) != 1) {
522 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
523 return NULL;
524 }
525
526 pr = sk_OSSL_CMP_POLLREQ_value(prc, 0);
527 certReqId = ossl_cmp_asn1_get_int(pr->certReqId);
528 if (!srv_ctx->process_pollReq(srv_ctx, req, certReqId,
529 &orig_req, &check_after))
530 return NULL;
531
532 if (orig_req != NULL) {
533 srv_ctx->polling = 0;
534 msg = process_non_polling_request(srv_ctx, orig_req);
535 OSSL_CMP_MSG_free(orig_req);
536 } else {
537 if ((msg = ossl_cmp_pollRep_new(srv_ctx->ctx, certReqId,
538 check_after)) == NULL)
539 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_POLLREP);
540 }
541 return msg;
542 }
543
544 /*
545 * Determine whether missing/invalid protection of request message is allowed.
546 * Return 1 on acceptance, 0 on rejection, or -1 on (internal) error.
547 */
unprotected_exception(const OSSL_CMP_CTX * ctx,const OSSL_CMP_MSG * req,int invalid_protection,int accept_unprotected_requests)548 static int unprotected_exception(const OSSL_CMP_CTX *ctx,
549 const OSSL_CMP_MSG *req,
550 int invalid_protection,
551 int accept_unprotected_requests)
552 {
553 if (!ossl_assert(ctx != NULL && req != NULL))
554 return -1;
555
556 if (accept_unprotected_requests) {
557 ossl_cmp_log1(WARN, ctx, "ignoring %s protection of request message",
558 invalid_protection ? "invalid" : "missing");
559 return 1;
560 }
561 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_ERROR
562 && OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_UNPROTECTED_ERRORS) == 1) {
563 ossl_cmp_warn(ctx, "ignoring missing protection of error message");
564 return 1;
565 }
566 return 0;
567 }
568
569 /*
570 * returns created message and NULL on internal error
571 */
OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)572 OSSL_CMP_MSG *OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX *srv_ctx,
573 const OSSL_CMP_MSG *req)
574 {
575 OSSL_CMP_CTX *ctx;
576 ASN1_OCTET_STRING *backup_secret;
577 OSSL_CMP_PKIHEADER *hdr;
578 int req_type, rsp_type;
579 int req_verified = 0;
580 OSSL_CMP_MSG *rsp = NULL;
581
582 if (srv_ctx == NULL || srv_ctx->ctx == NULL
583 || req == NULL || req->body == NULL
584 || (hdr = OSSL_CMP_MSG_get0_header(req)) == NULL) {
585 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
586 return 0;
587 }
588 ctx = srv_ctx->ctx;
589 backup_secret = ctx->secretValue;
590 req_type = OSSL_CMP_MSG_get_bodytype(req);
591 ossl_cmp_log1(DEBUG, ctx,
592 "received %s", ossl_cmp_bodytype_to_string(req_type));
593
594 /*
595 * Some things need to be done already before validating the message in
596 * order to be able to send an error message as far as needed and possible.
597 */
598 if (hdr->sender->type != GEN_DIRNAME) {
599 ERR_raise(ERR_LIB_CMP, CMP_R_SENDER_GENERALNAME_TYPE_NOT_SUPPORTED);
600 goto err;
601 }
602 if (!OSSL_CMP_CTX_set1_recipient(ctx, hdr->sender->d.directoryName))
603 goto err;
604
605 if (srv_ctx->polling && req_type != OSSL_CMP_PKIBODY_POLLREQ
606 && req_type != OSSL_CMP_PKIBODY_ERROR) {
607 ERR_raise(ERR_LIB_CMP, CMP_R_EXPECTED_POLLREQ);
608 goto err;
609 }
610
611 switch (req_type) {
612 case OSSL_CMP_PKIBODY_IR:
613 case OSSL_CMP_PKIBODY_CR:
614 case OSSL_CMP_PKIBODY_P10CR:
615 case OSSL_CMP_PKIBODY_KUR:
616 case OSSL_CMP_PKIBODY_RR:
617 case OSSL_CMP_PKIBODY_GENM:
618 case OSSL_CMP_PKIBODY_ERROR:
619 if (ctx->transactionID != NULL) {
620 char *tid = i2s_ASN1_OCTET_STRING(NULL, ctx->transactionID);
621
622 if (tid != NULL)
623 ossl_cmp_log1(WARN, ctx,
624 "Assuming that last transaction with ID=%s got aborted",
625 tid);
626 OPENSSL_free(tid);
627 }
628 /* start of a new transaction, reset transactionID and senderNonce */
629 if (!OSSL_CMP_CTX_set1_transactionID(ctx, NULL)
630 || !OSSL_CMP_CTX_set1_senderNonce(ctx, NULL))
631 goto err;
632
633 if (srv_ctx->clean_transaction != NULL
634 && !srv_ctx->clean_transaction(srv_ctx, NULL)) {
635 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE);
636 goto err;
637 }
638
639 break;
640 default:
641 /* transactionID should be already initialized */
642 if (ctx->transactionID == NULL) {
643 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
644 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
645 goto err;
646 #endif
647 }
648 }
649
650 req_verified = ossl_cmp_msg_check_update(ctx, req, unprotected_exception,
651 srv_ctx->acceptUnprotected);
652 if (ctx->secretValue != NULL && ctx->pkey != NULL
653 && ossl_cmp_hdr_get_protection_nid(hdr) != NID_id_PasswordBasedMAC)
654 ctx->secretValue = NULL; /* use MSG_SIG_ALG when protecting rsp */
655 if (!req_verified)
656 goto err;
657
658 if (req_type == OSSL_CMP_PKIBODY_POLLREQ) {
659 if (srv_ctx->process_pollReq == NULL)
660 ERR_raise(ERR_LIB_CMP, CMP_R_UNSUPPORTED_PKIBODY);
661 else
662 rsp = process_pollReq(srv_ctx, req);
663 } else {
664 if (srv_ctx->delayed_delivery != NULL
665 && (rsp = delayed_delivery(srv_ctx, req)) != NULL) {
666 goto err;
667 }
668 rsp = process_non_polling_request(srv_ctx, req);
669 }
670
671 err:
672 if (rsp == NULL) {
673 /* on error, try to respond with CMP error message to client */
674 const char *data = NULL, *reason = NULL;
675 int flags = 0;
676 unsigned long err = ERR_peek_error_data(&data, &flags);
677 int fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_badRequest;
678 /* fail_info is not very specific */
679 OSSL_CMP_PKISI *si = NULL;
680
681 if (!req_verified) {
682 /*
683 * Above ossl_cmp_msg_check_update() was not successfully executed,
684 * which normally would set ctx->transactionID and ctx->recipNonce.
685 * So anyway try to provide the right transactionID and recipNonce,
686 * while ignoring any (extra) error in next two function calls.
687 */
688 if (ctx->transactionID == NULL)
689 (void)OSSL_CMP_CTX_set1_transactionID(ctx, hdr->transactionID);
690 (void)ossl_cmp_ctx_set1_recipNonce(ctx, hdr->senderNonce);
691 }
692
693 if ((flags & ERR_TXT_STRING) == 0 || *data == '\0')
694 data = NULL;
695 reason = ERR_reason_error_string(err);
696 if ((si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection,
697 fail_info, reason)) != NULL) {
698 rsp = ossl_cmp_error_new(srv_ctx->ctx, si, err,
699 data, srv_ctx->sendUnprotectedErrors);
700 OSSL_CMP_PKISI_free(si);
701 }
702 }
703 OSSL_CMP_CTX_print_errors(ctx);
704 ctx->secretValue = backup_secret;
705
706 rsp_type =
707 rsp != NULL ? OSSL_CMP_MSG_get_bodytype(rsp) : OSSL_CMP_PKIBODY_ERROR;
708 if (rsp != NULL)
709 ossl_cmp_log1(DEBUG, ctx,
710 "sending %s", ossl_cmp_bodytype_to_string(rsp_type));
711 else
712 ossl_cmp_log(ERR, ctx, "cannot send proper CMP response");
713
714 /* determine whether to keep the transaction open or not */
715 ctx->status = OSSL_CMP_PKISTATUS_trans;
716 switch (rsp_type) {
717 case OSSL_CMP_PKIBODY_IP:
718 case OSSL_CMP_PKIBODY_CP:
719 case OSSL_CMP_PKIBODY_KUP:
720 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 0)
721 break;
722 /* fall through */
723
724 case OSSL_CMP_PKIBODY_ERROR:
725 if (rsp != NULL && ossl_cmp_is_error_with_waiting(rsp))
726 break;
727 /* fall through */
728
729 case OSSL_CMP_PKIBODY_RP:
730 case OSSL_CMP_PKIBODY_PKICONF:
731 case OSSL_CMP_PKIBODY_GENP:
732 /* Other terminating response message types are not supported */
733 srv_ctx->certReqId = OSSL_CMP_CERTREQID_INVALID;
734 /* Prepare for next transaction, ignoring any errors here: */
735 if (srv_ctx->clean_transaction != NULL)
736 (void)srv_ctx->clean_transaction(srv_ctx, ctx->transactionID);
737 (void)OSSL_CMP_CTX_set1_transactionID(ctx, NULL);
738 (void)OSSL_CMP_CTX_set1_senderNonce(ctx, NULL);
739 ctx->status = OSSL_CMP_PKISTATUS_unspecified; /* transaction closed */
740
741 default: /* not closing transaction in other cases */
742 break;
743 }
744 return rsp;
745 }
746
747 /*
748 * Server interface that may substitute OSSL_CMP_MSG_http_perform at the client.
749 * The OSSL_CMP_SRV_CTX must be set as client_ctx->transfer_cb_arg.
750 * returns received message on success, else NULL and pushes an element on the
751 * error stack.
752 */
OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX * client_ctx,const OSSL_CMP_MSG * req)753 OSSL_CMP_MSG *OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX *client_ctx,
754 const OSSL_CMP_MSG *req)
755 {
756 OSSL_CMP_SRV_CTX *srv_ctx = NULL;
757
758 if (client_ctx == NULL || req == NULL) {
759 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
760 return NULL;
761 }
762
763 if ((srv_ctx = OSSL_CMP_CTX_get_transfer_cb_arg(client_ctx)) == NULL) {
764 ERR_raise(ERR_LIB_CMP, CMP_R_TRANSFER_ERROR);
765 return NULL;
766 }
767
768 return OSSL_CMP_SRV_process_request(srv_ctx, req);
769 }
770
