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 /* 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 {
25 OSSL_CMP_CTX *ctx; /* Client CMP context, partly reused for srv */
26 void *custom_ctx; /* pointer to specific server context */
27
28 OSSL_CMP_SRV_cert_request_cb_t process_cert_request;
29 OSSL_CMP_SRV_rr_cb_t process_rr;
30 OSSL_CMP_SRV_genm_cb_t process_genm;
31 OSSL_CMP_SRV_error_cb_t process_error;
32 OSSL_CMP_SRV_certConf_cb_t process_certConf;
33 OSSL_CMP_SRV_pollReq_cb_t process_pollReq;
34
35 int sendUnprotectedErrors; /* Send error and rejection msgs unprotected */
36 int acceptUnprotected; /* Accept requests with no/invalid prot. */
37 int acceptRAVerified; /* Accept ir/cr/kur with POPO RAVerified */
38 int grantImplicitConfirm; /* Grant implicit confirmation if requested */
39
40 }; /* OSSL_CMP_SRV_CTX */
41
OSSL_CMP_SRV_CTX_free(OSSL_CMP_SRV_CTX * srv_ctx)42 void OSSL_CMP_SRV_CTX_free(OSSL_CMP_SRV_CTX *srv_ctx)
43 {
44 if (srv_ctx == NULL)
45 return;
46
47 OSSL_CMP_CTX_free(srv_ctx->ctx);
48 OPENSSL_free(srv_ctx);
49 }
50
OSSL_CMP_SRV_CTX_new(OSSL_LIB_CTX * libctx,const char * propq)51 OSSL_CMP_SRV_CTX *OSSL_CMP_SRV_CTX_new(OSSL_LIB_CTX *libctx, const char *propq)
52 {
53 OSSL_CMP_SRV_CTX *ctx = OPENSSL_zalloc(sizeof(OSSL_CMP_SRV_CTX));
54
55 if (ctx == NULL)
56 goto err;
57
58 if ((ctx->ctx = OSSL_CMP_CTX_new(libctx, propq)) == NULL)
59 goto err;
60
61 /* all other elements are initialized to 0 or NULL, respectively */
62 return ctx;
63 err:
64 OSSL_CMP_SRV_CTX_free(ctx);
65 return NULL;
66 }
67
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)68 int OSSL_CMP_SRV_CTX_init(OSSL_CMP_SRV_CTX *srv_ctx, void *custom_ctx,
69 OSSL_CMP_SRV_cert_request_cb_t process_cert_request,
70 OSSL_CMP_SRV_rr_cb_t process_rr,
71 OSSL_CMP_SRV_genm_cb_t process_genm,
72 OSSL_CMP_SRV_error_cb_t process_error,
73 OSSL_CMP_SRV_certConf_cb_t process_certConf,
74 OSSL_CMP_SRV_pollReq_cb_t process_pollReq)
75 {
76 if (srv_ctx == NULL) {
77 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
78 return 0;
79 }
80 srv_ctx->custom_ctx = custom_ctx;
81 srv_ctx->process_cert_request = process_cert_request;
82 srv_ctx->process_rr = process_rr;
83 srv_ctx->process_genm = process_genm;
84 srv_ctx->process_error = process_error;
85 srv_ctx->process_certConf = process_certConf;
86 srv_ctx->process_pollReq = process_pollReq;
87 return 1;
88 }
89
OSSL_CMP_SRV_CTX_get0_cmp_ctx(const OSSL_CMP_SRV_CTX * srv_ctx)90 OSSL_CMP_CTX *OSSL_CMP_SRV_CTX_get0_cmp_ctx(const OSSL_CMP_SRV_CTX *srv_ctx)
91 {
92 if (srv_ctx == NULL) {
93 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
94 return NULL;
95 }
96 return srv_ctx->ctx;
97 }
98
OSSL_CMP_SRV_CTX_get0_custom_ctx(const OSSL_CMP_SRV_CTX * srv_ctx)99 void *OSSL_CMP_SRV_CTX_get0_custom_ctx(const OSSL_CMP_SRV_CTX *srv_ctx)
100 {
101 if (srv_ctx == NULL) {
102 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
103 return NULL;
104 }
105 return srv_ctx->custom_ctx;
106 }
107
OSSL_CMP_SRV_CTX_set_send_unprotected_errors(OSSL_CMP_SRV_CTX * srv_ctx,int val)108 int OSSL_CMP_SRV_CTX_set_send_unprotected_errors(OSSL_CMP_SRV_CTX *srv_ctx,
109 int val)
110 {
111 if (srv_ctx == NULL) {
112 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
113 return 0;
114 }
115 srv_ctx->sendUnprotectedErrors = val != 0;
116 return 1;
117 }
118
OSSL_CMP_SRV_CTX_set_accept_unprotected(OSSL_CMP_SRV_CTX * srv_ctx,int val)119 int OSSL_CMP_SRV_CTX_set_accept_unprotected(OSSL_CMP_SRV_CTX *srv_ctx, int val)
120 {
121 if (srv_ctx == NULL) {
122 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
123 return 0;
124 }
125 srv_ctx->acceptUnprotected = val != 0;
126 return 1;
127 }
128
OSSL_CMP_SRV_CTX_set_accept_raverified(OSSL_CMP_SRV_CTX * srv_ctx,int val)129 int OSSL_CMP_SRV_CTX_set_accept_raverified(OSSL_CMP_SRV_CTX *srv_ctx, int val)
130 {
131 if (srv_ctx == NULL) {
132 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
133 return 0;
134 }
135 srv_ctx->acceptRAVerified = val != 0;
136 return 1;
137 }
138
OSSL_CMP_SRV_CTX_set_grant_implicit_confirm(OSSL_CMP_SRV_CTX * srv_ctx,int val)139 int OSSL_CMP_SRV_CTX_set_grant_implicit_confirm(OSSL_CMP_SRV_CTX *srv_ctx,
140 int val)
141 {
142 if (srv_ctx == NULL) {
143 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
144 return 0;
145 }
146 srv_ctx->grantImplicitConfirm = val != 0;
147 return 1;
148 }
149
150 /*
151 * Processes an ir/cr/p10cr/kur and returns a certification response.
152 * Only handles the first certification request contained in req
153 * returns an ip/cp/kup on success and NULL on error
154 */
process_cert_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)155 static OSSL_CMP_MSG *process_cert_request(OSSL_CMP_SRV_CTX *srv_ctx,
156 const OSSL_CMP_MSG *req)
157 {
158 OSSL_CMP_MSG *msg = NULL;
159 OSSL_CMP_PKISI *si = NULL;
160 X509 *certOut = NULL;
161 STACK_OF(X509) *chainOut = NULL, *caPubs = NULL;
162 const OSSL_CRMF_MSG *crm = NULL;
163 const X509_REQ *p10cr = NULL;
164 int bodytype;
165 int certReqId;
166
167 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
168 return NULL;
169
170 switch (OSSL_CMP_MSG_get_bodytype(req)) {
171 case OSSL_CMP_PKIBODY_P10CR:
172 case OSSL_CMP_PKIBODY_CR:
173 bodytype = OSSL_CMP_PKIBODY_CP;
174 break;
175 case OSSL_CMP_PKIBODY_IR:
176 bodytype = OSSL_CMP_PKIBODY_IP;
177 break;
178 case OSSL_CMP_PKIBODY_KUR:
179 bodytype = OSSL_CMP_PKIBODY_KUP;
180 break;
181 default:
182 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
183 return NULL;
184 }
185
186 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_P10CR) {
187 certReqId = OSSL_CMP_CERTREQID;
188 p10cr = req->body->value.p10cr;
189 } else {
190 OSSL_CRMF_MSGS *reqs = req->body->value.ir; /* same for cr and kur */
191
192 if (sk_OSSL_CRMF_MSG_num(reqs) != 1) {
193 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
194 return NULL;
195 }
196
197 if ((crm = sk_OSSL_CRMF_MSG_value(reqs, OSSL_CMP_CERTREQID)) == NULL) {
198 ERR_raise(ERR_LIB_CMP, CMP_R_CERTREQMSG_NOT_FOUND);
199 return NULL;
200 }
201 certReqId = OSSL_CRMF_MSG_get_certReqId(crm);
202 }
203
204 if (!ossl_cmp_verify_popo(srv_ctx->ctx, req, srv_ctx->acceptRAVerified)) {
205 /* Proof of possession could not be verified */
206 si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection,
207 1 << OSSL_CMP_PKIFAILUREINFO_badPOP,
208 ERR_reason_error_string(ERR_peek_error()));
209 if (si == NULL)
210 return NULL;
211 } else {
212 OSSL_CMP_PKIHEADER *hdr = OSSL_CMP_MSG_get0_header(req);
213
214 si = srv_ctx->process_cert_request(srv_ctx, req, certReqId, crm, p10cr,
215 &certOut, &chainOut, &caPubs);
216 if (si == NULL)
217 goto err;
218 /* set OSSL_CMP_OPT_IMPLICIT_CONFIRM if and only if transaction ends */
219 if (!OSSL_CMP_CTX_set_option(srv_ctx->ctx,
220 OSSL_CMP_OPT_IMPLICIT_CONFIRM,
221 ossl_cmp_hdr_has_implicitConfirm(hdr)
222 && srv_ctx->grantImplicitConfirm
223 /* do not set if polling starts: */
224 && certOut != NULL))
225 goto err;
226 }
227
228 msg = ossl_cmp_certrep_new(srv_ctx->ctx, bodytype, certReqId, si,
229 certOut, NULL /* enc */, chainOut, caPubs,
230 srv_ctx->sendUnprotectedErrors);
231 if (msg == NULL)
232 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_CERTREP);
233
234 err:
235 OSSL_CMP_PKISI_free(si);
236 X509_free(certOut);
237 sk_X509_pop_free(chainOut, X509_free);
238 sk_X509_pop_free(caPubs, X509_free);
239 return msg;
240 }
241
process_rr(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)242 static OSSL_CMP_MSG *process_rr(OSSL_CMP_SRV_CTX *srv_ctx,
243 const OSSL_CMP_MSG *req)
244 {
245 OSSL_CMP_MSG *msg = NULL;
246 OSSL_CMP_REVDETAILS *details;
247 OSSL_CRMF_CERTID *certId = NULL;
248 OSSL_CRMF_CERTTEMPLATE *tmpl;
249 const X509_NAME *issuer;
250 const ASN1_INTEGER *serial;
251 OSSL_CMP_PKISI *si;
252
253 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
254 return NULL;
255
256 if (sk_OSSL_CMP_REVDETAILS_num(req->body->value.rr) != 1) {
257 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
258 return NULL;
259 }
260
261 if ((details = sk_OSSL_CMP_REVDETAILS_value(req->body->value.rr,
262 OSSL_CMP_REVREQSID)) == NULL) {
263 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_PROCESSING_MESSAGE);
264 return NULL;
265 }
266
267 tmpl = details->certDetails;
268 issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl);
269 serial = OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl);
270 if (issuer != NULL && serial != NULL
271 && (certId = OSSL_CRMF_CERTID_gen(issuer, serial)) == NULL)
272 return NULL;
273 if ((si = srv_ctx->process_rr(srv_ctx, req, issuer, serial)) == NULL)
274 goto err;
275
276 if ((msg = ossl_cmp_rp_new(srv_ctx->ctx, si, certId,
277 srv_ctx->sendUnprotectedErrors)) == NULL)
278 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_RR);
279
280 err:
281 OSSL_CRMF_CERTID_free(certId);
282 OSSL_CMP_PKISI_free(si);
283 return msg;
284 }
285
286 /*
287 * Processes genm and creates a genp message mirroring the contents of the
288 * incoming message
289 */
process_genm(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)290 static OSSL_CMP_MSG *process_genm(OSSL_CMP_SRV_CTX *srv_ctx,
291 const OSSL_CMP_MSG *req)
292 {
293 OSSL_CMP_GENMSGCONTENT *itavs;
294 OSSL_CMP_MSG *msg;
295
296 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
297 return NULL;
298
299 if (!srv_ctx->process_genm(srv_ctx, req, req->body->value.genm, &itavs))
300 return NULL;
301
302 msg = ossl_cmp_genp_new(srv_ctx->ctx, itavs);
303 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
304 return msg;
305 }
306
process_error(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)307 static OSSL_CMP_MSG *process_error(OSSL_CMP_SRV_CTX *srv_ctx,
308 const OSSL_CMP_MSG *req)
309 {
310 OSSL_CMP_ERRORMSGCONTENT *errorContent;
311 OSSL_CMP_MSG *msg;
312
313 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
314 return NULL;
315 errorContent = req->body->value.error;
316 srv_ctx->process_error(srv_ctx, req, errorContent->pKIStatusInfo,
317 errorContent->errorCode, errorContent->errorDetails);
318
319 if ((msg = ossl_cmp_pkiconf_new(srv_ctx->ctx)) == NULL)
320 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_PKICONF);
321 return msg;
322 }
323
process_certConf(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)324 static OSSL_CMP_MSG *process_certConf(OSSL_CMP_SRV_CTX *srv_ctx,
325 const OSSL_CMP_MSG *req)
326 {
327 OSSL_CMP_CTX *ctx;
328 OSSL_CMP_CERTCONFIRMCONTENT *ccc;
329 int num;
330 OSSL_CMP_MSG *msg = NULL;
331 OSSL_CMP_CERTSTATUS *status = NULL;
332
333 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
334 return NULL;
335
336 ctx = srv_ctx->ctx;
337 ccc = req->body->value.certConf;
338 num = sk_OSSL_CMP_CERTSTATUS_num(ccc);
339
340 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 1
341 || ctx->status != -2 /* transaction not open */) {
342 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_UNEXPECTED_CERTCONF);
343 return NULL;
344 }
345
346 if (num == 0) {
347 ossl_cmp_err(ctx, "certificate rejected by client");
348 } else {
349 if (num > 1)
350 ossl_cmp_warn(ctx, "All CertStatus but the first will be ignored");
351 status = sk_OSSL_CMP_CERTSTATUS_value(ccc, OSSL_CMP_CERTREQID);
352 }
353
354 if (status != NULL) {
355 int certReqId = ossl_cmp_asn1_get_int(status->certReqId);
356 ASN1_OCTET_STRING *certHash = status->certHash;
357 OSSL_CMP_PKISI *si = status->statusInfo;
358
359 if (!srv_ctx->process_certConf(srv_ctx, req, certReqId, certHash, si))
360 return NULL; /* reason code may be: CMP_R_CERTHASH_UNMATCHED */
361
362 if (si != NULL && ossl_cmp_pkisi_get_status(si)
363 != OSSL_CMP_PKISTATUS_accepted) {
364 int pki_status = ossl_cmp_pkisi_get_status(si);
365 const char *str = ossl_cmp_PKIStatus_to_string(pki_status);
366
367 ossl_cmp_log2(INFO, ctx, "certificate rejected by client %s %s",
368 str == NULL ? "without" : "with",
369 str == NULL ? "PKIStatus" : str);
370 }
371 }
372
373 if ((msg = ossl_cmp_pkiconf_new(ctx)) == NULL)
374 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_PKICONF);
375 return msg;
376 }
377
process_pollReq(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)378 static OSSL_CMP_MSG *process_pollReq(OSSL_CMP_SRV_CTX *srv_ctx,
379 const OSSL_CMP_MSG *req)
380 {
381 OSSL_CMP_POLLREQCONTENT *prc;
382 OSSL_CMP_POLLREQ *pr;
383 int certReqId;
384 OSSL_CMP_MSG *certReq;
385 int64_t check_after = 0;
386 OSSL_CMP_MSG *msg = NULL;
387
388 if (!ossl_assert(srv_ctx != NULL && srv_ctx->ctx != NULL && req != NULL))
389 return NULL;
390
391 prc = req->body->value.pollReq;
392 if (sk_OSSL_CMP_POLLREQ_num(prc) != 1) {
393 ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_REQUESTS_NOT_SUPPORTED);
394 return NULL;
395 }
396
397 pr = sk_OSSL_CMP_POLLREQ_value(prc, 0);
398 certReqId = ossl_cmp_asn1_get_int(pr->certReqId);
399 if (!srv_ctx->process_pollReq(srv_ctx, req, certReqId,
400 &certReq, &check_after))
401 return NULL;
402
403 if (certReq != NULL) {
404 msg = process_cert_request(srv_ctx, certReq);
405 OSSL_CMP_MSG_free(certReq);
406 } else {
407 if ((msg = ossl_cmp_pollRep_new(srv_ctx->ctx, certReqId,
408 check_after)) == NULL)
409 ERR_raise(ERR_LIB_CMP, CMP_R_ERROR_CREATING_POLLREP);
410 }
411 return msg;
412 }
413
414 /*
415 * Determine whether missing/invalid protection of request message is allowed.
416 * Return 1 on acceptance, 0 on rejection, or -1 on (internal) error.
417 */
unprotected_exception(const OSSL_CMP_CTX * ctx,const OSSL_CMP_MSG * req,int invalid_protection,int accept_unprotected_requests)418 static int unprotected_exception(const OSSL_CMP_CTX *ctx,
419 const OSSL_CMP_MSG *req,
420 int invalid_protection,
421 int accept_unprotected_requests)
422 {
423 if (!ossl_assert(ctx != NULL && req != NULL))
424 return -1;
425
426 if (accept_unprotected_requests) {
427 ossl_cmp_log1(WARN, ctx, "ignoring %s protection of request message",
428 invalid_protection ? "invalid" : "missing");
429 return 1;
430 }
431 if (OSSL_CMP_MSG_get_bodytype(req) == OSSL_CMP_PKIBODY_ERROR
432 && OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_UNPROTECTED_ERRORS) == 1) {
433 ossl_cmp_warn(ctx, "ignoring missing protection of error message");
434 return 1;
435 }
436 return 0;
437 }
438
439 /*
440 * returns created message and NULL on internal error
441 */
OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX * srv_ctx,const OSSL_CMP_MSG * req)442 OSSL_CMP_MSG *OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX *srv_ctx,
443 const OSSL_CMP_MSG *req)
444 {
445 OSSL_CMP_CTX *ctx;
446 ASN1_OCTET_STRING *backup_secret;
447 OSSL_CMP_PKIHEADER *hdr;
448 int req_type, rsp_type;
449 int res;
450 OSSL_CMP_MSG *rsp = NULL;
451
452 if (srv_ctx == NULL || srv_ctx->ctx == NULL
453 || req == NULL || req->body == NULL
454 || (hdr = OSSL_CMP_MSG_get0_header(req)) == NULL) {
455 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
456 return 0;
457 }
458 ctx = srv_ctx->ctx;
459 backup_secret = ctx->secretValue;
460 req_type = OSSL_CMP_MSG_get_bodytype(req);
461 ossl_cmp_log1(DEBUG, ctx,
462 "received %s", ossl_cmp_bodytype_to_string(req_type));
463
464 /*
465 * Some things need to be done already before validating the message in
466 * order to be able to send an error message as far as needed and possible.
467 */
468 if (hdr->sender->type != GEN_DIRNAME) {
469 ERR_raise(ERR_LIB_CMP, CMP_R_SENDER_GENERALNAME_TYPE_NOT_SUPPORTED);
470 goto err;
471 }
472 if (!OSSL_CMP_CTX_set1_recipient(ctx, hdr->sender->d.directoryName))
473 goto err;
474
475 switch (req_type) {
476 case OSSL_CMP_PKIBODY_IR:
477 case OSSL_CMP_PKIBODY_CR:
478 case OSSL_CMP_PKIBODY_P10CR:
479 case OSSL_CMP_PKIBODY_KUR:
480 case OSSL_CMP_PKIBODY_RR:
481 case OSSL_CMP_PKIBODY_GENM:
482 case OSSL_CMP_PKIBODY_ERROR:
483 if (ctx->transactionID != NULL) {
484 char *tid;
485
486 tid = OPENSSL_buf2hexstr(ctx->transactionID->data,
487 ctx->transactionID->length);
488 if (tid != NULL)
489 ossl_cmp_log1(WARN, ctx,
490 "Assuming that last transaction with ID=%s got aborted",
491 tid);
492 OPENSSL_free(tid);
493 }
494 /* start of a new transaction, reset transactionID and senderNonce */
495 if (!OSSL_CMP_CTX_set1_transactionID(ctx, NULL)
496 || !OSSL_CMP_CTX_set1_senderNonce(ctx, NULL))
497 goto err;
498 break;
499 default:
500 /* transactionID should be already initialized */
501 if (ctx->transactionID == NULL) {
502 #ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
503 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
504 goto err;
505 #endif
506 }
507 }
508
509 res = ossl_cmp_msg_check_update(ctx, req, unprotected_exception,
510 srv_ctx->acceptUnprotected);
511 if (ctx->secretValue != NULL && ctx->pkey != NULL
512 && ossl_cmp_hdr_get_protection_nid(hdr) != NID_id_PasswordBasedMAC)
513 ctx->secretValue = NULL; /* use MSG_SIG_ALG when protecting rsp */
514 if (!res)
515 goto err;
516
517 switch (req_type) {
518 case OSSL_CMP_PKIBODY_IR:
519 case OSSL_CMP_PKIBODY_CR:
520 case OSSL_CMP_PKIBODY_P10CR:
521 case OSSL_CMP_PKIBODY_KUR:
522 if (srv_ctx->process_cert_request == NULL)
523 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
524 else
525 rsp = process_cert_request(srv_ctx, req);
526 break;
527 case OSSL_CMP_PKIBODY_RR:
528 if (srv_ctx->process_rr == NULL)
529 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
530 else
531 rsp = process_rr(srv_ctx, req);
532 break;
533 case OSSL_CMP_PKIBODY_GENM:
534 if (srv_ctx->process_genm == NULL)
535 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
536 else
537 rsp = process_genm(srv_ctx, req);
538 break;
539 case OSSL_CMP_PKIBODY_ERROR:
540 if (srv_ctx->process_error == NULL)
541 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
542 else
543 rsp = process_error(srv_ctx, req);
544 break;
545 case OSSL_CMP_PKIBODY_CERTCONF:
546 if (srv_ctx->process_certConf == NULL)
547 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
548 else
549 rsp = process_certConf(srv_ctx, req);
550 break;
551 case OSSL_CMP_PKIBODY_POLLREQ:
552 if (srv_ctx->process_pollReq == NULL)
553 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
554 else
555 rsp = process_pollReq(srv_ctx, req);
556 break;
557 default:
558 ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);
559 break;
560 }
561
562 err:
563 if (rsp == NULL) {
564 /* on error, try to respond with CMP error message to client */
565 const char *data = NULL, *reason = NULL;
566 int flags = 0;
567 unsigned long err = ERR_peek_error_data(&data, &flags);
568 int fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_badRequest;
569 OSSL_CMP_PKISI *si = NULL;
570
571 if (ctx->transactionID == NULL) {
572 /* ignore any (extra) error in next two function calls: */
573 (void)OSSL_CMP_CTX_set1_transactionID(ctx, hdr->transactionID);
574 (void)ossl_cmp_ctx_set1_recipNonce(ctx, hdr->senderNonce);
575 }
576
577 if ((flags & ERR_TXT_STRING) == 0 || *data == '\0')
578 data = NULL;
579 reason = ERR_reason_error_string(err);
580 if ((si = OSSL_CMP_STATUSINFO_new(OSSL_CMP_PKISTATUS_rejection,
581 fail_info, reason)) != NULL) {
582 rsp = ossl_cmp_error_new(srv_ctx->ctx, si, err,
583 data, srv_ctx->sendUnprotectedErrors);
584 OSSL_CMP_PKISI_free(si);
585 }
586 }
587 OSSL_CMP_CTX_print_errors(ctx);
588 ctx->secretValue = backup_secret;
589
590 rsp_type =
591 rsp != NULL ? OSSL_CMP_MSG_get_bodytype(rsp) : OSSL_CMP_PKIBODY_ERROR;
592 if (rsp != NULL)
593 ossl_cmp_log1(DEBUG, ctx,
594 "sending %s", ossl_cmp_bodytype_to_string(rsp_type));
595 else
596 ossl_cmp_log(ERR, ctx, "cannot send proper CMP response");
597
598 /* possibly close the transaction */
599 ctx->status = -2; /* this indicates transaction is open */
600 switch (rsp_type) {
601 case OSSL_CMP_PKIBODY_IP:
602 case OSSL_CMP_PKIBODY_CP:
603 case OSSL_CMP_PKIBODY_KUP:
604 if (OSSL_CMP_CTX_get_option(ctx, OSSL_CMP_OPT_IMPLICIT_CONFIRM) == 0)
605 break;
606 /* fall through */
607
608 case OSSL_CMP_PKIBODY_RP:
609 case OSSL_CMP_PKIBODY_PKICONF:
610 case OSSL_CMP_PKIBODY_GENP:
611 case OSSL_CMP_PKIBODY_ERROR:
612 (void)OSSL_CMP_CTX_set1_transactionID(ctx, NULL);
613 (void)OSSL_CMP_CTX_set1_senderNonce(ctx, NULL);
614 ctx->status = -1; /* transaction closed */
615
616 default: /* not closing transaction in other cases */
617 break;
618 }
619 return rsp;
620 }
621
622 /*
623 * Server interface that may substitute OSSL_CMP_MSG_http_perform at the client.
624 * The OSSL_CMP_SRV_CTX must be set as client_ctx->transfer_cb_arg.
625 * returns received message on success, else NULL and pushes an element on the
626 * error stack.
627 */
OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX * client_ctx,const OSSL_CMP_MSG * req)628 OSSL_CMP_MSG *OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX *client_ctx,
629 const OSSL_CMP_MSG *req)
630 {
631 OSSL_CMP_SRV_CTX *srv_ctx = NULL;
632
633 if (client_ctx == NULL || req == NULL) {
634 ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
635 return NULL;
636 }
637
638 if ((srv_ctx = OSSL_CMP_CTX_get_transfer_cb_arg(client_ctx)) == NULL) {
639 ERR_raise(ERR_LIB_CMP, CMP_R_TRANSFER_ERROR);
640 return NULL;
641 }
642
643 return OSSL_CMP_SRV_process_request(srv_ctx, req);
644 }
645