8 OSSL_CMP_CTX_get0_libctx, OSSL_CMP_CTX_get0_propq,
9 OSSL_CMP_CTX_set_option,
10 OSSL_CMP_CTX_get_option,
11 OSSL_CMP_CTX_set_log_cb,
12 OSSL_CMP_CTX_set_log_verbosity,
13 OSSL_CMP_CTX_print_errors,
14 OSSL_CMP_CTX_set1_serverPath,
15 OSSL_CMP_CTX_set1_server,
16 OSSL_CMP_CTX_set_serverPort,
17 OSSL_CMP_CTX_set1_proxy,
18 OSSL_CMP_CTX_set1_no_proxy,
19 OSSL_CMP_CTX_set_http_cb,
20 OSSL_CMP_CTX_set_http_cb_arg,
21 OSSL_CMP_CTX_get_http_cb_arg,
22 OSSL_CMP_transfer_cb_t,
23 OSSL_CMP_CTX_set_transfer_cb,
24 OSSL_CMP_CTX_set_transfer_cb_arg,
25 OSSL_CMP_CTX_get_transfer_cb_arg,
26 OSSL_CMP_CTX_set1_srvCert,
27 OSSL_CMP_CTX_set1_expected_sender,
28 OSSL_CMP_CTX_set0_trusted,
29 OSSL_CMP_CTX_set0_trustedStore,
30 OSSL_CMP_CTX_get0_trusted,
31 OSSL_CMP_CTX_get0_trustedStore,
32 OSSL_CMP_CTX_set1_untrusted,
33 OSSL_CMP_CTX_get0_untrusted,
34 OSSL_CMP_CTX_set1_cert,
35 OSSL_CMP_CTX_build_cert_chain,
36 OSSL_CMP_CTX_set1_pkey,
37 OSSL_CMP_CTX_set1_referenceValue,
38 OSSL_CMP_CTX_set1_secretValue,
39 OSSL_CMP_CTX_set1_recipient,
40 OSSL_CMP_CTX_push0_geninfo_ITAV,
41 OSSL_CMP_CTX_reset_geninfo_ITAVs,
42 OSSL_CMP_CTX_set1_extraCertsOut,
43 OSSL_CMP_CTX_set0_newPkey,
44 OSSL_CMP_CTX_get0_newPkey,
45 OSSL_CMP_CTX_set1_issuer,
46 OSSL_CMP_CTX_set1_subjectName,
47 OSSL_CMP_CTX_push1_subjectAltName,
48 OSSL_CMP_CTX_set0_reqExtensions,
49 OSSL_CMP_CTX_reqExtensions_have_SAN,
50 OSSL_CMP_CTX_push0_policy,
51 OSSL_CMP_CTX_set1_oldCert,
52 OSSL_CMP_CTX_set1_p10CSR,
53 OSSL_CMP_CTX_push0_genm_ITAV,
54 OSSL_CMP_certConf_cb_t,
56 OSSL_CMP_CTX_set_certConf_cb,
57 OSSL_CMP_CTX_set_certConf_cb_arg,
58 OSSL_CMP_CTX_get_certConf_cb_arg,
59 OSSL_CMP_CTX_get_status,
60 OSSL_CMP_CTX_get0_statusString,
61 OSSL_CMP_CTX_get_failInfoCode,
62 OSSL_CMP_CTX_get0_validatedSrvCert,
63 OSSL_CMP_CTX_get0_newCert,
64 OSSL_CMP_CTX_get1_newChain,
65 OSSL_CMP_CTX_get1_caPubs,
66 OSSL_CMP_CTX_get1_extraCertsIn,
67 OSSL_CMP_CTX_set1_transactionID,
68 OSSL_CMP_CTX_set1_senderNonce
69 - functions for managing the CMP client context data structure
73 #include <openssl/cmp.h>
75 OSSL_CMP_CTX *OSSL_CMP_CTX_new(OSSL_LIB_CTX *libctx, const char *propq);
76 void OSSL_CMP_CTX_free(OSSL_CMP_CTX *ctx);
77 int OSSL_CMP_CTX_reinit(OSSL_CMP_CTX *ctx);
78 OSSL_LIB_CTX *OSSL_CMP_CTX_get0_libctx(const OSSL_CMP_CTX *ctx);
79 const char *OSSL_CMP_CTX_get0_propq(const OSSL_CMP_CTX *ctx);
80 int OSSL_CMP_CTX_set_option(OSSL_CMP_CTX *ctx, int opt, int val);
81 int OSSL_CMP_CTX_get_option(const OSSL_CMP_CTX *ctx, int opt);
83 /* logging and error reporting: */
84 int OSSL_CMP_CTX_set_log_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_log_cb_t cb);
85 #define OSSL_CMP_CTX_set_log_verbosity(ctx, level)
86 void OSSL_CMP_CTX_print_errors(const OSSL_CMP_CTX *ctx);
88 /* message transfer: */
89 int OSSL_CMP_CTX_set1_serverPath(OSSL_CMP_CTX *ctx, const char *path);
90 int OSSL_CMP_CTX_set1_server(OSSL_CMP_CTX *ctx, const char *address);
91 int OSSL_CMP_CTX_set_serverPort(OSSL_CMP_CTX *ctx, int port);
92 int OSSL_CMP_CTX_set1_proxy(OSSL_CMP_CTX *ctx, const char *name);
93 int OSSL_CMP_CTX_set1_no_proxy(OSSL_CMP_CTX *ctx, const char *names);
94 int OSSL_CMP_CTX_set_http_cb(OSSL_CMP_CTX *ctx, HTTP_bio_cb_t cb);
95 int OSSL_CMP_CTX_set_http_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
96 void *OSSL_CMP_CTX_get_http_cb_arg(const OSSL_CMP_CTX *ctx);
97 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t)(OSSL_CMP_CTX *ctx,
98 const OSSL_CMP_MSG *req);
99 int OSSL_CMP_CTX_set_transfer_cb(OSSL_CMP_CTX *ctx,
100 OSSL_CMP_transfer_cb_t cb);
101 int OSSL_CMP_CTX_set_transfer_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
102 void *OSSL_CMP_CTX_get_transfer_cb_arg(const OSSL_CMP_CTX *ctx);
104 /* server authentication: */
105 int OSSL_CMP_CTX_set1_srvCert(OSSL_CMP_CTX *ctx, X509 *cert);
106 int OSSL_CMP_CTX_set1_expected_sender(OSSL_CMP_CTX *ctx,
107 const X509_NAME *name);
108 #define OSSL_CMP_CTX_set0_trusted OSSL_CMP_CTX_set0_trustedStore
109 int OSSL_CMP_CTX_set0_trustedStore(OSSL_CMP_CTX *ctx, X509_STORE *store);
110 #define OSSL_CMP_CTX_get0_trusted OSSL_CMP_CTX_get0_trustedStore
111 X509_STORE *OSSL_CMP_CTX_get0_trustedStore(const OSSL_CMP_CTX *ctx);
112 int OSSL_CMP_CTX_set1_untrusted(OSSL_CMP_CTX *ctx, STACK_OF(X509) *certs);
113 STACK_OF(X509) *OSSL_CMP_CTX_get0_untrusted(const OSSL_CMP_CTX *ctx);
115 /* client authentication: */
116 int OSSL_CMP_CTX_set1_cert(OSSL_CMP_CTX *ctx, X509 *cert);
117 int OSSL_CMP_CTX_build_cert_chain(OSSL_CMP_CTX *ctx, X509_STORE *own_trusted,
118 STACK_OF(X509) *candidates);
119 int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
120 int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
121 const unsigned char *ref, int len);
122 int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx,
123 const unsigned char *sec, int len);
125 /* CMP message header and extra certificates: */
126 int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
127 int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
128 int OSSL_CMP_CTX_reset_geninfo_ITAVs(OSSL_CMP_CTX *ctx);
129 int OSSL_CMP_CTX_set1_extraCertsOut(OSSL_CMP_CTX *ctx,
130 STACK_OF(X509) *extraCertsOut);
132 /* certificate template: */
133 int OSSL_CMP_CTX_set0_newPkey(OSSL_CMP_CTX *ctx, int priv, EVP_PKEY *pkey);
134 EVP_PKEY *OSSL_CMP_CTX_get0_newPkey(const OSSL_CMP_CTX *ctx, int priv);
135 int OSSL_CMP_CTX_set1_issuer(OSSL_CMP_CTX *ctx, const X509_NAME *name);
136 int OSSL_CMP_CTX_set1_subjectName(OSSL_CMP_CTX *ctx, const X509_NAME *name);
137 int OSSL_CMP_CTX_push1_subjectAltName(OSSL_CMP_CTX *ctx,
138 const GENERAL_NAME *name);
139 int OSSL_CMP_CTX_set0_reqExtensions(OSSL_CMP_CTX *ctx, X509_EXTENSIONS *exts);
140 int OSSL_CMP_CTX_reqExtensions_have_SAN(OSSL_CMP_CTX *ctx);
141 int OSSL_CMP_CTX_push0_policy(OSSL_CMP_CTX *ctx, POLICYINFO *pinfo);
142 int OSSL_CMP_CTX_set1_oldCert(OSSL_CMP_CTX *ctx, X509 *cert);
143 int OSSL_CMP_CTX_set1_p10CSR(OSSL_CMP_CTX *ctx, const X509_REQ *csr);
145 /* misc body contents: */
146 int OSSL_CMP_CTX_push0_genm_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
148 /* certificate confirmation: */
149 typedef int (*OSSL_CMP_certConf_cb_t)(OSSL_CMP_CTX *ctx, X509 *cert,
150 int fail_info, const char **txt);
151 int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,
153 int OSSL_CMP_CTX_set_certConf_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_certConf_cb_t cb);
154 int OSSL_CMP_CTX_set_certConf_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
155 void *OSSL_CMP_CTX_get_certConf_cb_arg(const OSSL_CMP_CTX *ctx);
157 /* result fetching: */
158 int OSSL_CMP_CTX_get_status(const OSSL_CMP_CTX *ctx);
159 OSSL_CMP_PKIFREETEXT *OSSL_CMP_CTX_get0_statusString(const OSSL_CMP_CTX *ctx);
160 int OSSL_CMP_CTX_get_failInfoCode(const OSSL_CMP_CTX *ctx);
162 X509 *OSSL_CMP_CTX_get0_validatedSrvCert(const OSSL_CMP_CTX *ctx);
163 X509 *OSSL_CMP_CTX_get0_newCert(const OSSL_CMP_CTX *ctx);
164 STACK_OF(X509) *OSSL_CMP_CTX_get1_newChain(const OSSL_CMP_CTX *ctx);
165 STACK_OF(X509) *OSSL_CMP_CTX_get1_caPubs(const OSSL_CMP_CTX *ctx);
166 STACK_OF(X509) *OSSL_CMP_CTX_get1_extraCertsIn(const OSSL_CMP_CTX *ctx);
168 /* for testing and debugging purposes: */
169 int OSSL_CMP_CTX_set1_transactionID(OSSL_CMP_CTX *ctx,
170 const ASN1_OCTET_STRING *id);
171 int OSSL_CMP_CTX_set1_senderNonce(OSSL_CMP_CTX *ctx,
172 const ASN1_OCTET_STRING *nonce);
176 This is the context API for using CMP (Certificate Management Protocol) with
179 OSSL_CMP_CTX_new() allocates an B<OSSL_CMP_CTX> structure associated with
180 the library context I<libctx> and property query string I<propq>,
181 both of which may be NULL to select the defaults.
182 It initializes the remaining fields to their default values - for instance,
183 the logging verbosity is set to OSSL_CMP_LOG_INFO,
184 the message timeout is set to 120 seconds,
185 and the proof-of-possession method is set to OSSL_CRMF_POPO_SIGNATURE.
187 OSSL_CMP_CTX_free() deallocates an OSSL_CMP_CTX structure.
189 OSSL_CMP_CTX_reinit() prepares the given I<ctx> for a further transaction by
190 clearing the internal CMP transaction (aka session) status, PKIStatusInfo,
191 and any previous results (newCert, newChain, caPubs, and extraCertsIn)
192 from the last executed transaction.
193 It also clears any ITAVs that were added by OSSL_CMP_CTX_push0_genm_ITAV().
194 All other field values (i.e., CMP options) are retained for potential re-use.
196 OSSL_CMP_CTX_get0_libctx() returns the I<libctx> argument that was used
197 when constructing I<ctx> with OSSL_CMP_CTX_new(), which may be NULL.
199 OSSL_CMP_CTX_get0_propq() returns the I<propq> argument that was used
200 when constructing I<ctx> with OSSL_CMP_CTX_new(), which may be NULL.
202 OSSL_CMP_CTX_set_option() sets the given value for the given option
203 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) in the given OSSL_CMP_CTX structure.
205 The following options can be set:
209 =item B<OSSL_CMP_OPT_LOG_VERBOSITY>
211 The level of severity needed for actually outputting log messages
212 due to errors, warnings, general info, debugging, etc.
213 Default is OSSL_CMP_LOG_INFO. See also L<OSSL_CMP_log_open(3)>.
215 =item B<OSSL_CMP_OPT_KEEP_ALIVE>
217 If the given value is 0 then HTTP connections are not kept open
218 after receiving a response, which is the default behavior for HTTP 1.0.
219 If the value is 1 or 2 then persistent connections are requested.
220 If the value is 2 then persistent connections are required,
221 i.e., in case the server does not grant them an error occurs.
222 The default value is 1: prefer to keep the connection open.
224 =item B<OSSL_CMP_OPT_MSG_TIMEOUT>
226 Number of seconds a CMP request-response message round trip
227 is allowed to take before a timeout error is returned.
228 A value <= 0 means no limitation (waiting indefinitely).
229 Default is to use the B<OSSL_CMP_OPT_TOTAL_TIMEOUT> setting.
231 =item B<OSSL_CMP_OPT_TOTAL_TIMEOUT>
233 Maximum total number of seconds a transaction may take,
234 including polling etc.
235 A value <= 0 means no limitation (waiting indefinitely).
238 =item B<OSSL_CMP_OPT_VALIDITY_DAYS>
240 Number of days new certificates are asked to be valid for.
242 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT>
244 Do not take default Subject Alternative Names
245 from the reference certificate.
247 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_CRITICAL>
249 Demand that the given Subject Alternative Names are flagged as critical.
251 =item B<OSSL_CMP_OPT_POLICIES_CRITICAL>
253 Demand that the given policies are flagged as critical.
255 =item B<OSSL_CMP_OPT_POPO_METHOD>
257 Select the proof of possession method to use. Possible values are:
259 OSSL_CRMF_POPO_NONE - ProofOfPossession field omitted
260 OSSL_CRMF_POPO_RAVERIFIED - assert that the RA has already
262 OSSL_CRMF_POPO_SIGNATURE - sign a value with private key,
263 which is the default.
264 OSSL_CRMF_POPO_KEYENC - decrypt the encrypted certificate
267 Note that a signature-based POPO can only be produced if a private key
268 is provided as the newPkey or client's pkey component of the CMP context.
270 =item B<OSSL_CMP_OPT_DIGEST_ALGNID>
272 The NID of the digest algorithm to be used in RFC 4210's MSG_SIG_ALG
273 for signature-based message protection and Proof-of-Possession (POPO).
276 =item B<OSSL_CMP_OPT_OWF_ALGNID>
277 The NID of the digest algorithm to be used as one-way function (OWF)
278 in RFC 4210's MSG_MAC_ALG for PBM-based message protection.
281 =item B<OSSL_CMP_OPT_MAC_ALGNID>
282 The NID of the MAC algorithm to be used in RFC 4210's MSG_MAC_ALG
283 for PBM-based message protection.
284 Default is HMAC-SHA1 as per RFC 4210.
286 =item B<OSSL_CMP_OPT_REVOCATION_REASON>
288 The reason code to be included in a Revocation Request (RR);
289 values: 0..10 (RFC 5210, 5.3.1) or -1 for none, which is the default.
291 =item B<OSSL_CMP_OPT_IMPLICIT_CONFIRM>
293 Request server to enable implicit confirm mode, where the client
294 does not need to send confirmation upon receiving the
295 certificate. If the server does not enable implicit confirmation
296 in the return message, then confirmation is sent anyway.
298 =item B<OSSL_CMP_OPT_DISABLE_CONFIRM>
300 Do not confirm enrolled certificates, to cope with broken servers
301 not supporting implicit confirmation correctly.
302 B<WARNING:> This setting leads to unspecified behavior and it is meant
303 exclusively to allow interoperability with server implementations violating
306 =item B<OSSL_CMP_OPT_UNPROTECTED_SEND>
308 Send request or response messages without CMP-level protection.
310 =item B<OSSL_CMP_OPT_UNPROTECTED_ERRORS>
312 Accept unprotected error responses which are either explicitly
313 unprotected or where protection verification failed. Applies to regular
314 error messages as well as certificate responses (IP/CP/KUP) and
315 revocation responses (RP) with rejection.
316 B<WARNING:> This setting leads to unspecified behavior and it is meant
317 exclusively to allow interoperability with server implementations violating
320 =item B<OSSL_CMP_OPT_IGNORE_KEYUSAGE>
322 Ignore key usage restrictions in the signer's certificate when
323 validating signature-based protection in received CMP messages.
324 Else, 'digitalSignature' must be allowed by CMP signer certificates.
326 =item B<OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR>
328 Allow retrieving a trust anchor from extraCerts and using that
329 to validate the certificate chain of an IP message.
333 OSSL_CMP_CTX_get_option() reads the current value of the given option
334 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) from the given OSSL_CMP_CTX structure.
336 OSSL_CMP_CTX_set_log_cb() sets in I<ctx> the callback function I<cb>
337 for handling error queue entries and logging messages.
338 When I<cb> is NULL errors are printed to STDERR (if available, else ignored)
339 any log messages are ignored.
340 Alternatively, L<OSSL_CMP_log_open(3)> may be used to direct logging to STDOUT.
342 OSSL_CMP_CTX_set_log_verbosity() is a macro setting the
343 OSSL_CMP_OPT_LOG_VERBOSITY context option to the given level.
345 OSSL_CMP_CTX_print_errors() outputs any entries in the OpenSSL error queue. It
346 is similar to L<ERR_print_errors_cb(3)> but uses the CMP log callback function
347 if set in the I<ctx> for uniformity with CMP logging if given. Otherwise it uses
348 L<ERR_print_errors(3)> to print to STDERR (unless OPENSSL_NO_STDIO is defined).
350 OSSL_CMP_CTX_set1_serverPath() sets the HTTP path of the CMP server on the host,
351 also known as "CMP alias".
354 OSSL_CMP_CTX_set1_server() sets the given server I<address>
355 (which may be a hostname or IP address or NULL) in the given I<ctx>.
357 OSSL_CMP_CTX_set_serverPort() sets the port of the CMP server to connect to.
358 If not used or the I<port> argument is 0
359 the default port applies, which is 80 for HTTP and 443 for HTTPS.
361 OSSL_CMP_CTX_set1_proxy() sets the HTTP proxy to be used for connecting to
362 the given CMP server unless overruled by any "no_proxy" settings (see below).
363 If TLS is not used this defaults to the value of
364 the environment variable C<http_proxy> if set, else C<HTTP_PROXY>.
365 Otherwise defaults to the value of C<https_proxy> if set, else C<HTTPS_PROXY>.
366 An empty proxy string specifies not to use a proxy.
367 Else the format is C<[http[s]://]address[:port][/path]>,
368 where any path given is ignored.
369 The default port number is 80, or 443 in case C<https:> is given.
371 OSSL_CMP_CTX_set1_no_proxy() sets the list of server hostnames not to use
372 an HTTP proxy for. The names may be separated by commas and/or whitespace.
373 Defaults to the environment variable C<no_proxy> if set, else C<NO_PROXY>.
375 OSSL_CMP_CTX_set_http_cb() sets the optional BIO connect/disconnect callback
376 function, which has the prototype
378 typedef BIO *(*HTTP_bio_cb_t) (BIO *bio, void *ctx, int connect, int detail);
380 The callback may modify the I<bio> provided by L<OSSL_CMP_MSG_http_perform(3)>,
381 whereby it may make use of a custom defined argument I<ctx>
382 stored in the OSSL_CMP_CTX by means of OSSL_CMP_CTX_set_http_cb_arg().
383 During connection establishment, just after calling BIO_do_connect_retry(),
384 the function is invoked with the I<connect> argument being 1 and the I<detail>
385 argument being 1 if HTTPS is requested, i.e., SSL/TLS should be enabled. On
386 disconnect I<connect> is 0 and I<detail> is 1 in case no error occurred, else 0.
387 For instance, on connect the function may prepend a TLS BIO to implement HTTPS;
388 after disconnect it may do some diagnostic output and/or specific cleanup.
389 The function should return NULL to indicate failure.
390 After disconnect the modified BIO will be deallocated using BIO_free_all().
392 OSSL_CMP_CTX_set_http_cb_arg() sets an argument, respectively a pointer to
393 a structure containing arguments,
394 optionally to be used by the http connect/disconnect callback function.
395 I<arg> is not consumed, and it must therefore explicitly be freed when not
396 needed any more. I<arg> may be NULL to clear the entry.
398 OSSL_CMP_CTX_get_http_cb_arg() gets the argument, respectively the pointer to a
399 structure containing arguments, previously set by
400 OSSL_CMP_CTX_set_http_cb_arg() or NULL if unset.
402 OSSL_CMP_CTX_set_transfer_cb() sets the message transfer callback function,
405 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t) (OSSL_CMP_CTX *ctx,
406 const OSSL_CMP_MSG *req);
408 Returns 1 on success, 0 on error.
410 Default is NULL, which implies the use of L<OSSL_CMP_MSG_http_perform(3)>.
411 The callback should send the CMP request message it obtains via the I<req>
412 parameter and on success return the response, else it must return NULL.
413 The transfer callback may make use of a custom defined argument stored in
414 the ctx by means of OSSL_CMP_CTX_set_transfer_cb_arg(), which may be retrieved
415 again through OSSL_CMP_CTX_get_transfer_cb_arg().
417 OSSL_CMP_CTX_set_transfer_cb_arg() sets an argument, respectively a pointer to a
418 structure containing arguments, optionally to be used by the transfer callback.
419 I<arg> is not consumed, and it must therefore explicitly be freed when not
420 needed any more. I<arg> may be NULL to clear the entry.
422 OSSL_CMP_CTX_get_transfer_cb_arg() gets the argument, respectively the pointer
423 to a structure containing arguments, previously set by
424 OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
426 OSSL_CMP_CTX_set1_srvCert() sets the expected server cert in I<ctx> and trusts
427 it directly (even if it is expired) when verifying signed response messages.
428 This pins the accepted CMP server
429 and results in ignoring whatever may be set using OSSL_CMP_CTX_set0_trusted().
430 Any previously set value is freed.
431 The I<cert> argument may be NULL to clear the entry.
432 If set, the subject of the certificate is also used
433 as default value for the recipient of CMP requests
434 and as default value for the expected sender of CMP responses.
436 OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN)
437 expected in the sender field of incoming CMP messages.
438 Defaults to the subject of the pinned server certificate, if any.
439 This can be used to make sure that only a particular entity is accepted as
440 CMP message signer, and attackers are not able to use arbitrary certificates
441 of a trusted PKI hierarchy to fraudulently pose as CMP server.
442 Note that this gives slightly more freedom than OSSL_CMP_CTX_set1_srvCert(),
443 which pins the server to the holder of a particular certificate, while the
444 expected sender name will continue to match after updates of the server cert.
446 OSSL_CMP_CTX_set0_trusted() is an alias of the original
447 OSSL_CMP_CTX_set0_trustedStore().
448 It sets in the CMP context I<ctx> the certificate store of type X509_STORE
449 containing trusted certificates, typically of root CAs.
450 This is ignored when a certificate is pinned using OSSL_CMP_CTX_set1_srvCert().
451 The store may also hold CRLs and a certificate verification callback function
452 used for signature-based peer authentication.
453 Any store entry already set before is freed.
454 When given a NULL parameter the entry is cleared.
456 OSSL_CMP_CTX_get0_trusted() is an alias of the original
457 OSSL_CMP_CTX_get0_trustedStore().
458 It extracts from the CMP context I<ctx> the pointer to the currently set
459 certificate store containing trust anchors etc., or an empty store if unset.
461 OSSL_CMP_CTX_set1_untrusted() sets up a list of non-trusted certificates
462 of intermediate CAs that may be useful for path construction for the own CMP
463 signer certificate, for the own TLS certificate (if any), when verifying peer
464 CMP protection certificates, and when verifying newly enrolled certificates.
465 The reference counts of those certificates handled successfully are increased.
467 OSSL_CMP_CTX_get0_untrusted() returns a pointer to the
468 list of untrusted certs in I<ctx>, which may be empty if unset.
470 OSSL_CMP_CTX_set1_cert() sets the CMP signer certificate
471 related to the private key used for CMP message protection.
472 Therefore the public key of this I<cert> must correspond to
473 the private key set before or thereafter via OSSL_CMP_CTX_set1_pkey().
474 When using signature-based protection of CMP request messages
475 this CMP signer certificate will be included first in the extraCerts field.
476 It serves as fallback reference certificate, see OSSL_CMP_CTX_set1_oldCert().
477 The subject of this I<cert> will be used as the sender field of outgoing
478 messages, while the subject of any cert set via OSSL_CMP_CTX_set1_oldCert(),
479 the subject of any PKCS#10 CSR set via OSSL_CMP_CTX_set1_p10CSR(),
480 and any value set via OSSL_CMP_CTX_set1_subjectName() are used as fallback.
482 The I<cert> argument may be NULL to clear the entry.
484 OSSL_CMP_CTX_build_cert_chain() builds a certificate chain for the CMP signer
485 certificate previously set in the I<ctx>. It adds the optional I<candidates>,
486 a list of intermediate CA certs that may already constitute the targeted chain,
487 to the untrusted certs that may already exist in the I<ctx>.
488 Then the function uses this augmented set of certs for chain construction.
489 If I<own_trusted> is NULL it builds the chain as far down as possible and
490 ignores any verification errors. Else the CMP signer certificate must be
491 verifiable where the chain reaches a trust anchor contained in I<own_trusted>.
492 On success the function stores the resulting chain in I<ctx>
493 for inclusion in the extraCerts field of signature-protected messages.
494 Calling this function is optional; by default a chain construction
495 is performed on demand that is equivalent to calling this function
496 with the I<candidates> and I<own_trusted> arguments being NULL.
498 OSSL_CMP_CTX_set1_pkey() sets the client's private key corresponding to the
499 CMP signer certificate set via OSSL_CMP_CTX_set1_cert().
500 This key is used create signature-based protection (protectionAlg = MSG_SIG_ALG)
502 unless a PBM secret has been set via OSSL_CMP_CTX_set1_secretValue().
503 The I<pkey> argument may be NULL to clear the entry.
505 OSSL_CMP_CTX_set1_secretValue() sets the byte string I<sec> with length I<len>
506 as PBM secret in the given I<ctx> or clears it if the I<sec> argument is NULL.
507 If present, this secret is used to create PBM-based protection of outgoing
508 messages and to verify any PBM-based protection of incoming messages
509 (protectionAlg = MSG_MAC_ALG). PBM stands for Password-Based MAC.
510 PBM-based protection takes precedence over signature-based protection.
512 OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue I<ref> with
513 length I<len> in the given I<ctx> or clears it if the I<ref> argument is NULL.
514 According to RFC 4210 section 5.1.1, if no value for the sender field in
515 CMP message headers can be determined (i.e., no CMP signer certificate
516 and no subject DN is set via OSSL_CMP_CTX_set1_subjectName()
517 then the sender field will contain the NULL-DN
518 and the senderKID field of the CMP message header must be set.
519 When signature-based protection is used the senderKID will be set to
520 the subjectKeyIdentifier of the CMP signer certificate as far as present.
521 If not present or when PBM-based protection is used
522 the I<ref> value is taken as the fallback value for the senderKID.
524 OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
525 PKIHeader of CMP request messages, i.e. the X509 name of the (CA) server.
527 The recipient field in the header of a CMP message is mandatory.
528 If not given explicitly the recipient is determined in the following order:
529 the subject of the CMP server certificate set using OSSL_CMP_CTX_set1_srvCert(),
530 the value set using OSSL_CMP_CTX_set1_issuer(),
531 the issuer of the certificate set using OSSL_CMP_CTX_set1_oldCert(),
532 the issuer of the CMP signer certificate,
533 as far as any of those is present, else the NULL-DN as last resort.
535 OSSL_CMP_CTX_push0_geninfo_ITAV() adds I<itav> to the stack in the I<ctx> to be
536 added to the GeneralInfo field of the CMP PKIMessage header of a request
537 message sent with this context.
539 OSSL_CMP_CTX_reset_geninfo_ITAVs()
540 clears any ITAVs that were added by OSSL_CMP_CTX_push0_geninfo_ITAV().
542 OSSL_CMP_CTX_set1_extraCertsOut() sets the stack of extraCerts that will be
545 OSSL_CMP_CTX_set0_newPkey() can be used to explicitly set the given EVP_PKEY
546 structure as the private or public key to be certified in the CMP context.
547 The I<priv> parameter must be 0 if and only if the given key is a public key.
549 OSSL_CMP_CTX_get0_newPkey() gives the key to use for certificate enrollment
550 dependent on fields of the CMP context structure:
551 the newPkey (which may be a private or public key) if present,
552 else the public key in the p10CSR if present, else the client's private key.
553 If the I<priv> parameter is not 0 and the selected key does not have a
554 private component then NULL is returned.
556 OSSL_CMP_CTX_set1_issuer() sets the name of the intended issuer that
557 will be set in the CertTemplate, i.e., the X509 name of the CA server.
559 OSSL_CMP_CTX_set1_subjectName() sets the subject DN that will be used in
560 the CertTemplate structure when requesting a new cert. For Key Update Requests
561 (KUR), it defaults to the subject DN of the reference certificate,
562 see OSSL_CMP_CTX_set1_oldCert(). This default is used for Initialization
563 Requests (IR) and Certification Requests (CR) only if no SANs are set.
564 The I<subjectName> is also used as fallback for the sender field
565 of outgoing CMP messages if no reference certificate is available.
567 OSSL_CMP_CTX_push1_subjectAltName() adds the given X509 name to the list of
568 alternate names on the certificate template request. This cannot be used if
569 any Subject Alternative Name extension is set via
570 OSSL_CMP_CTX_set0_reqExtensions().
571 By default, unless B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT> has been set,
572 the Subject Alternative Names are copied from the reference certificate,
573 see OSSL_CMP_CTX_set1_oldCert().
574 If set and the subject DN is not set with OSSL_CMP_CTX_set1_subjectName() then
575 the certificate template of an IR and CR will not be filled with the default
576 subject DN from the reference certificate.
577 If a subject DN is desired it needs to be set explicitly with
578 OSSL_CMP_CTX_set1_subjectName().
580 OSSL_CMP_CTX_set0_reqExtensions() sets the X.509v3 extensions to be used in
583 OSSL_CMP_CTX_reqExtensions_have_SAN() returns 1 if the context contains
584 a Subject Alternative Name extension, else 0 or -1 on error.
586 OSSL_CMP_CTX_push0_policy() adds the certificate policy info object
587 to the X509_EXTENSIONS of the requested certificate template.
589 OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
590 Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
591 It must be given for RR, else it defaults to the CMP signer certificate.
592 The I<reference certificate> determined in this way, if any, is also used for
593 deriving default subject DN, public key, Subject Alternative Names, and the
594 default issuer entry in the requested certificate template of IR/CR/KUR.
595 The subject of the reference certificate is used as the sender field value
596 in CMP message headers.
597 Its issuer is used as default recipient in CMP message headers.
599 OSSL_CMP_CTX_set1_p10CSR() sets the PKCS#10 CSR to use in P10CR messages.
600 If such a CSR is provided, its subject, public key, and extension fields are
601 also used as fallback values for the certificate template of IR/CR/KUR messages.
603 OSSL_CMP_CTX_push0_genm_ITAV() adds I<itav> to the stack in the I<ctx> which
604 will be the body of a General Message sent with this context.
606 OSSL_CMP_certConf_cb() is the default certificate confirmation callback function.
607 If the callback argument is not NULL it must point to a trust store.
608 In this case the function checks that the newly enrolled certificate can be
609 verified using this trust store and untrusted certificates from the I<ctx>,
610 which have been augmented by the list of extraCerts received.
611 During this verification, any certificate status checking is disabled.
612 If the callback argument is NULL the function tries building an approximate
613 chain as far as possible using the same untrusted certificates from the I<ctx>,
614 and if this fails it takes the received extraCerts as fallback.
615 The resulting cert chain can be retrieved using OSSL_CMP_CTX_get1_newChain().
617 OSSL_CMP_CTX_set_certConf_cb() sets the callback used for evaluating the newly
618 enrolled certificate before the library sends, depending on its result,
619 a positive or negative certConf message to the server. The callback has type
621 typedef int (*OSSL_CMP_certConf_cb_t) (OSSL_CMP_CTX *ctx, X509 *cert,
622 int fail_info, const char **txt);
624 and should inspect the certificate it obtains via the I<cert> parameter and may
625 overrule the pre-decision given in the I<fail_info> and I<*txt> parameters.
626 If it accepts the certificate it must return 0, indicating success. Else it must
627 return a bit field reflecting PKIFailureInfo with at least one failure bit and
628 may set the I<*txt> output parameter to point to a string constant with more
629 detail. The transfer callback may make use of a custom defined argument stored
630 in the I<ctx> by means of OSSL_CMP_CTX_set_certConf_cb_arg(), which may be
631 retrieved again through OSSL_CMP_CTX_get_certConf_cb_arg().
632 Typically, the callback will check at least that the certificate can be verified
633 using a set of trusted certificates.
634 It also could compare the subject DN and other fields of the newly
635 enrolled certificate with the certificate template of the request.
637 OSSL_CMP_CTX_set_certConf_cb_arg() sets an argument, respectively a pointer to a
638 structure containing arguments, optionally to be used by the certConf callback.
639 I<arg> is not consumed, and it must therefore explicitly be freed when not
640 needed any more. I<arg> may be NULL to clear the entry.
642 OSSL_CMP_CTX_get_certConf_cb_arg() gets the argument, respectively the pointer
643 to a structure containing arguments, previously set by
644 OSSL_CMP_CTX_set_certConf_cb_arg(), or NULL if unset.
646 OSSL_CMP_CTX_get_status() returns for client contexts the PKIstatus from
647 the last received CertRepMessage or Revocation Response or error message:
648 =item B<OSSL_CMP_PKISTATUS_accepted> on successful receipt of a GENP message:
652 =item B<OSSL_CMP_PKISTATUS_request>
654 if an IR/CR/KUR/RR/GENM request message could not be produced,
656 =item B<OSSL_CMP_PKISTATUS_trans>
658 on a transmission error or transaction error for this type of request, and
660 =item B<OSSL_CMP_PKISTATUS_unspecified>
662 if no such request was attempted or OSSL_CMP_CTX_reinit() has been called.
666 For server contexts it returns
667 B<OSSL_CMP_PKISTATUS_trans> if a transaction is open,
668 otherwise B<OSSL_CMP_PKISTATUS_unspecified>.
670 OSSL_CMP_CTX_get0_statusString() returns the statusString from the last received
671 CertRepMessage or Revocation Response or error message, or NULL if unset.
673 OSSL_CMP_CTX_get_failInfoCode() returns the error code from the failInfo field
674 of the last received CertRepMessage or Revocation Response or error message,
675 or -1 if no such response was received or OSSL_CMP_CTX_reinit() has been called.
676 This is a bit field and the flags for it are specified in the header file
677 F<< <openssl/cmp.h> >>.
678 The flags start with OSSL_CMP_CTX_FAILINFO, for example:
679 OSSL_CMP_CTX_FAILINFO_badAlg. Returns -1 if the failInfoCode field is unset.
681 OSSL_CMP_CTX_get0_validatedSrvCert() returns
682 the successfully validated certificate, if any, that the CMP server used
683 in the current transaction for signature-based response message protection,
684 or NULL if the server used MAC-based protection.
685 The value is relevant only at the end of a successful transaction.
686 It may be used to check the authorization of the server based on its cert.
688 OSSL_CMP_CTX_get0_newCert() returns the pointer to the newly obtained
689 certificate in case it is available, else NULL.
691 OSSL_CMP_CTX_get1_newChain() returns a pointer to a duplicate of the stack of
692 X.509 certificates computed by OSSL_CMP_certConf_cb() (if this function has
693 been called) on the last received certificate response message IP/CP/KUP.
695 OSSL_CMP_CTX_get1_caPubs() returns a pointer to a duplicate of the list of
696 X.509 certificates in the caPubs field of the last received certificate
697 response message (of type IP, CP, or KUP),
698 or an empty stack if no caPubs have been received in the current transaction.
700 OSSL_CMP_CTX_get1_extraCertsIn() returns a pointer to a duplicate of the list
701 of X.509 certificates contained in the extraCerts field of the last received
702 response message (except for pollRep and PKIConf), or
703 an empty stack if no extraCerts have been received in the current transaction.
705 OSSL_CMP_CTX_set1_transactionID() sets the given transaction ID in the given
706 OSSL_CMP_CTX structure.
708 OSSL_CMP_CTX_set1_senderNonce() stores the last sent sender I<nonce> in
709 the I<ctx>. This will be used to validate the recipNonce in incoming messages.
713 CMP is defined in RFC 4210 (and CRMF in RFC 4211).
717 OSSL_CMP_CTX_free() and OSSL_CMP_CTX_print_errors() do not return anything.
720 OSSL_CMP_CTX_get0_libctx(), OSSL_CMP_CTX_get0_propq(),
721 OSSL_CMP_CTX_get_http_cb_arg(),
722 OSSL_CMP_CTX_get_transfer_cb_arg(),
723 OSSL_CMP_CTX_get0_trusted(),
724 OSSL_CMP_CTX_get0_untrusted(),
725 OSSL_CMP_CTX_get0_newPkey(),
726 OSSL_CMP_CTX_get_certConf_cb_arg(),
727 OSSL_CMP_CTX_get0_statusString(),
728 OSSL_CMP_CTX_get0_validatedSrvCert(),
729 OSSL_CMP_CTX_get0_newCert(),
730 OSSL_CMP_CTX_get0_newChain(),
731 OSSL_CMP_CTX_get1_caPubs(), and
732 OSSL_CMP_CTX_get1_extraCertsIn()
733 return the intended pointer value as described above or NULL on error.
735 OSSL_CMP_CTX_get_option(),
736 OSSL_CMP_CTX_reqExtensions_have_SAN(),
737 OSSL_CMP_CTX_get_status(), and
738 OSSL_CMP_CTX_get_failInfoCode()
739 return the intended value as described above or -1 on error.
741 OSSL_CMP_certConf_cb() returns I<fail_info> if it is not equal to 0,
742 else 0 on successful validation,
743 or else a bit field with the B<OSSL_CMP_PKIFAILUREINFO_incorrectData> bit set.
745 All other functions, including OSSL_CMP_CTX_reinit()
746 and OSSL_CMP_CTX_reset_geninfo_ITAVs(),
747 return 1 on success, 0 on error.
751 The following code omits error handling.
753 Set up a CMP client context for sending requests and verifying responses:
755 cmp_ctx = OSSL_CMP_CTX_new();
756 OSSL_CMP_CTX_set1_server(cmp_ctx, name_or_address);
757 OSSL_CMP_CTX_set1_serverPort(cmp_ctx, port_string);
758 OSSL_CMP_CTX_set1_serverPath(cmp_ctx, path_or_alias);
759 OSSL_CMP_CTX_set0_trusted(cmp_ctx, ts);
761 Set up client credentials for password-based protection (PBM):
763 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
764 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
766 Set up the details for certificate requests:
768 OSSL_CMP_CTX_set1_subjectName(cmp_ctx, name);
769 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, initialKey);
771 Perform an Initialization Request transaction:
773 initialCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
775 Reset the transaction state of the CMP context and the credentials:
777 OSSL_CMP_CTX_reinit(cmp_ctx);
778 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, NULL, 0);
779 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, NULL, 0);
781 Perform a Certification Request transaction, making use of the new credentials:
783 OSSL_CMP_CTX_set1_cert(cmp_ctx, initialCert);
784 OSSL_CMP_CTX_set1_pkey(cmp_ctx, initialKey);
785 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, curentKey);
786 currentCert = OSSL_CMP_exec_CR_ses(cmp_ctx);
788 Perform a Key Update Request, signed using the cert (and key) to be updated:
790 OSSL_CMP_CTX_reinit(cmp_ctx);
791 OSSL_CMP_CTX_set1_cert(cmp_ctx, currentCert);
792 OSSL_CMP_CTX_set1_pkey(cmp_ctx, currentKey);
793 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, updatedKey);
794 currentCert = OSSL_CMP_exec_KUR_ses(cmp_ctx);
795 currentKey = updatedKey;
797 Perform a General Message transaction including, as an example,
798 the id-it-signKeyPairTypes OID and prints info on the General Response contents:
800 OSSL_CMP_CTX_reinit(cmp_ctx);
802 ASN1_OBJECT *type = OBJ_txt2obj("1.3.6.1.5.5.7.4.2", 1);
803 OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_create(type, NULL);
804 OSSL_CMP_CTX_push0_genm_ITAV(cmp_ctx, itav);
806 STACK_OF(OSSL_CMP_ITAV) *itavs;
807 itavs = OSSL_CMP_exec_GENM_ses(cmp_ctx);
809 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
813 L<OSSL_CMP_exec_IR_ses(3)>, L<OSSL_CMP_exec_CR_ses(3)>,
814 L<OSSL_CMP_exec_KUR_ses(3)>, L<OSSL_CMP_exec_GENM_ses(3)>,
815 L<OSSL_CMP_exec_certreq(3)>, L<OSSL_CMP_MSG_http_perform(3)>,
816 L<ERR_print_errors_cb(3)>
820 The OpenSSL CMP support was added in OpenSSL 3.0.
822 OSSL_CMP_CTX_get0_trustedStore() was renamed to OSSL_CMP_CTX_get0_trusted() and
823 OSSL_CMP_CTX_set0_trustedStore() was renamed to OSSL_CMP_CTX_set0_trusted(),
824 using macros, while keeping the old names for backward compatibility,
827 OSSL_CMP_CTX_reset_geninfo_ITAVs() was added in OpenSSL 3.0.8.
829 OSSL_CMP_CTX_get0_libctx(), OSSL_CMP_CTX_get0_propq(), and
830 OSSL_CMP_CTX_get0_validatedSrvCert() were added in OpenSSL 3.2.
834 Copyright 2007-2022 The OpenSSL Project Authors. All Rights Reserved.
836 Licensed under the Apache License 2.0 (the "License"). You may not use
837 this file except in compliance with the License. You can obtain a copy
838 in the file LICENSE in the source distribution or at
839 L<https://www.openssl.org/source/license.html>.