8 OSSL_CMP_CTX_set_option,
9 OSSL_CMP_CTX_get_option,
10 OSSL_CMP_CTX_set_log_cb,
11 OSSL_CMP_CTX_set_log_verbosity,
12 OSSL_CMP_CTX_print_errors,
13 OSSL_CMP_CTX_set1_serverPath,
14 OSSL_CMP_CTX_set1_server,
15 OSSL_CMP_CTX_set_serverPort,
16 OSSL_CMP_CTX_set1_proxy,
17 OSSL_CMP_CTX_set1_no_proxy,
18 OSSL_CMP_CTX_set_http_cb,
19 OSSL_CMP_CTX_set_http_cb_arg,
20 OSSL_CMP_CTX_get_http_cb_arg,
21 OSSL_CMP_transfer_cb_t,
22 OSSL_CMP_CTX_set_transfer_cb,
23 OSSL_CMP_CTX_set_transfer_cb_arg,
24 OSSL_CMP_CTX_get_transfer_cb_arg,
25 OSSL_CMP_CTX_set1_srvCert,
26 OSSL_CMP_CTX_set1_expected_sender,
27 OSSL_CMP_CTX_set0_trustedStore,
28 OSSL_CMP_CTX_get0_trustedStore,
29 OSSL_CMP_CTX_set1_untrusted,
30 OSSL_CMP_CTX_get0_untrusted,
31 OSSL_CMP_CTX_set1_cert,
32 OSSL_CMP_CTX_build_cert_chain,
33 OSSL_CMP_CTX_set1_pkey,
34 OSSL_CMP_CTX_set1_referenceValue,
35 OSSL_CMP_CTX_set1_secretValue,
36 OSSL_CMP_CTX_set1_recipient,
37 OSSL_CMP_CTX_push0_geninfo_ITAV,
38 OSSL_CMP_CTX_reset_geninfo_ITAVs,
39 OSSL_CMP_CTX_set1_extraCertsOut,
40 OSSL_CMP_CTX_set0_newPkey,
41 OSSL_CMP_CTX_get0_newPkey,
42 OSSL_CMP_CTX_set1_issuer,
43 OSSL_CMP_CTX_set1_subjectName,
44 OSSL_CMP_CTX_push1_subjectAltName,
45 OSSL_CMP_CTX_set0_reqExtensions,
46 OSSL_CMP_CTX_reqExtensions_have_SAN,
47 OSSL_CMP_CTX_push0_policy,
48 OSSL_CMP_CTX_set1_oldCert,
49 OSSL_CMP_CTX_set1_p10CSR,
50 OSSL_CMP_CTX_push0_genm_ITAV,
51 OSSL_CMP_certConf_cb_t,
53 OSSL_CMP_CTX_set_certConf_cb,
54 OSSL_CMP_CTX_set_certConf_cb_arg,
55 OSSL_CMP_CTX_get_certConf_cb_arg,
56 OSSL_CMP_CTX_get_status,
57 OSSL_CMP_CTX_get0_statusString,
58 OSSL_CMP_CTX_get_failInfoCode,
59 OSSL_CMP_CTX_get0_newCert,
60 OSSL_CMP_CTX_get1_newChain,
61 OSSL_CMP_CTX_get1_caPubs,
62 OSSL_CMP_CTX_get1_extraCertsIn,
63 OSSL_CMP_CTX_set1_transactionID,
64 OSSL_CMP_CTX_set1_senderNonce
65 - functions for managing the CMP client context data structure
69 #include <openssl/cmp.h>
71 OSSL_CMP_CTX *OSSL_CMP_CTX_new(OSSL_LIB_CTX *libctx, const char *propq);
72 void OSSL_CMP_CTX_free(OSSL_CMP_CTX *ctx);
73 int OSSL_CMP_CTX_reinit(OSSL_CMP_CTX *ctx);
74 int OSSL_CMP_CTX_set_option(OSSL_CMP_CTX *ctx, int opt, int val);
75 int OSSL_CMP_CTX_get_option(const OSSL_CMP_CTX *ctx, int opt);
77 /* logging and error reporting: */
78 int OSSL_CMP_CTX_set_log_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_log_cb_t cb);
79 #define OSSL_CMP_CTX_set_log_verbosity(ctx, level)
80 void OSSL_CMP_CTX_print_errors(const OSSL_CMP_CTX *ctx);
82 /* message transfer: */
83 int OSSL_CMP_CTX_set1_serverPath(OSSL_CMP_CTX *ctx, const char *path);
84 int OSSL_CMP_CTX_set1_server(OSSL_CMP_CTX *ctx, const char *address);
85 int OSSL_CMP_CTX_set_serverPort(OSSL_CMP_CTX *ctx, int port);
86 int OSSL_CMP_CTX_set1_proxy(OSSL_CMP_CTX *ctx, const char *name);
87 int OSSL_CMP_CTX_set1_no_proxy(OSSL_CMP_CTX *ctx, const char *names);
88 int OSSL_CMP_CTX_set_http_cb(OSSL_CMP_CTX *ctx, HTTP_bio_cb_t cb);
89 int OSSL_CMP_CTX_set_http_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
90 void *OSSL_CMP_CTX_get_http_cb_arg(const OSSL_CMP_CTX *ctx);
91 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t)(OSSL_CMP_CTX *ctx,
92 const OSSL_CMP_MSG *req);
93 int OSSL_CMP_CTX_set_transfer_cb(OSSL_CMP_CTX *ctx,
94 OSSL_CMP_transfer_cb_t cb);
95 int OSSL_CMP_CTX_set_transfer_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
96 void *OSSL_CMP_CTX_get_transfer_cb_arg(const OSSL_CMP_CTX *ctx);
98 /* server authentication: */
99 int OSSL_CMP_CTX_set1_srvCert(OSSL_CMP_CTX *ctx, X509 *cert);
100 int OSSL_CMP_CTX_set1_expected_sender(OSSL_CMP_CTX *ctx,
101 const X509_NAME *name);
102 int OSSL_CMP_CTX_set0_trustedStore(OSSL_CMP_CTX *ctx, X509_STORE *store);
103 X509_STORE *OSSL_CMP_CTX_get0_trustedStore(const OSSL_CMP_CTX *ctx);
104 int OSSL_CMP_CTX_set1_untrusted(OSSL_CMP_CTX *ctx, STACK_OF(X509) *certs);
105 STACK_OF(X509) *OSSL_CMP_CTX_get0_untrusted(const OSSL_CMP_CTX *ctx);
107 /* client authentication: */
108 int OSSL_CMP_CTX_set1_cert(OSSL_CMP_CTX *ctx, X509 *cert);
109 int OSSL_CMP_CTX_build_cert_chain(OSSL_CMP_CTX *ctx, X509_STORE *own_trusted,
110 STACK_OF(X509) *candidates);
111 int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
112 int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
113 const unsigned char *ref, int len);
114 int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx,
115 const unsigned char *sec, int len);
117 /* CMP message header and extra certificates: */
118 int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
119 int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
120 int OSSL_CMP_CTX_reset_geninfo_ITAVs(OSSL_CMP_CTX *ctx);
121 int OSSL_CMP_CTX_set1_extraCertsOut(OSSL_CMP_CTX *ctx,
122 STACK_OF(X509) *extraCertsOut);
124 /* certificate template: */
125 int OSSL_CMP_CTX_set0_newPkey(OSSL_CMP_CTX *ctx, int priv, EVP_PKEY *pkey);
126 EVP_PKEY *OSSL_CMP_CTX_get0_newPkey(const OSSL_CMP_CTX *ctx, int priv);
127 int OSSL_CMP_CTX_set1_issuer(OSSL_CMP_CTX *ctx, const X509_NAME *name);
128 int OSSL_CMP_CTX_set1_subjectName(OSSL_CMP_CTX *ctx, const X509_NAME *name);
129 int OSSL_CMP_CTX_push1_subjectAltName(OSSL_CMP_CTX *ctx,
130 const GENERAL_NAME *name);
131 int OSSL_CMP_CTX_set0_reqExtensions(OSSL_CMP_CTX *ctx, X509_EXTENSIONS *exts);
132 int OSSL_CMP_CTX_reqExtensions_have_SAN(OSSL_CMP_CTX *ctx);
133 int OSSL_CMP_CTX_push0_policy(OSSL_CMP_CTX *ctx, POLICYINFO *pinfo);
134 int OSSL_CMP_CTX_set1_oldCert(OSSL_CMP_CTX *ctx, X509 *cert);
135 int OSSL_CMP_CTX_set1_p10CSR(OSSL_CMP_CTX *ctx, const X509_REQ *csr);
137 /* misc body contents: */
138 int OSSL_CMP_CTX_push0_genm_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
140 /* certificate confirmation: */
141 typedef int (*OSSL_CMP_certConf_cb_t)(OSSL_CMP_CTX *ctx, X509 *cert,
142 int fail_info, const char **txt);
143 int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,
145 int OSSL_CMP_CTX_set_certConf_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_certConf_cb_t cb);
146 int OSSL_CMP_CTX_set_certConf_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
147 void *OSSL_CMP_CTX_get_certConf_cb_arg(const OSSL_CMP_CTX *ctx);
149 /* result fetching: */
150 int OSSL_CMP_CTX_get_status(const OSSL_CMP_CTX *ctx);
151 OSSL_CMP_PKIFREETEXT *OSSL_CMP_CTX_get0_statusString(const OSSL_CMP_CTX *ctx);
152 int OSSL_CMP_CTX_get_failInfoCode(const OSSL_CMP_CTX *ctx);
154 X509 *OSSL_CMP_CTX_get0_newCert(const OSSL_CMP_CTX *ctx);
155 STACK_OF(X509) *OSSL_CMP_CTX_get1_newChain(const OSSL_CMP_CTX *ctx);
156 STACK_OF(X509) *OSSL_CMP_CTX_get1_caPubs(const OSSL_CMP_CTX *ctx);
157 STACK_OF(X509) *OSSL_CMP_CTX_get1_extraCertsIn(const OSSL_CMP_CTX *ctx);
159 /* for testing and debugging purposes: */
160 int OSSL_CMP_CTX_set1_transactionID(OSSL_CMP_CTX *ctx,
161 const ASN1_OCTET_STRING *id);
162 int OSSL_CMP_CTX_set1_senderNonce(OSSL_CMP_CTX *ctx,
163 const ASN1_OCTET_STRING *nonce);
167 This is the context API for using CMP (Certificate Management Protocol) with
170 OSSL_CMP_CTX_new() allocates an B<OSSL_CMP_CTX> structure associated with
171 the library context I<libctx> and property query string I<propq>,
172 both of which may be NULL to select the defaults.
173 It initializes the remaining fields to their default values - for instance,
174 the logging verbosity is set to OSSL_CMP_LOG_INFO,
175 the message timeout is set to 120 seconds,
176 and the proof-of-possession method is set to OSSL_CRMF_POPO_SIGNATURE.
178 OSSL_CMP_CTX_free() deallocates an OSSL_CMP_CTX structure.
180 OSSL_CMP_CTX_reinit() prepares the given I<ctx> for a further transaction by
181 clearing the internal CMP transaction (aka session) status, PKIStatusInfo,
182 and any previous results (newCert, newChain, caPubs, and extraCertsIn)
183 from the last executed transaction.
184 It also clears any ITAVs that were added by OSSL_CMP_CTX_push0_genm_ITAV().
185 All other field values (i.e., CMP options) are retained for potential re-use.
187 OSSL_CMP_CTX_set_option() sets the given value for the given option
188 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) in the given OSSL_CMP_CTX structure.
190 The following options can be set:
194 =item B<OSSL_CMP_OPT_LOG_VERBOSITY>
196 The level of severity needed for actually outputting log messages
197 due to errors, warnings, general info, debugging, etc.
198 Default is OSSL_CMP_LOG_INFO. See also L<OSSL_CMP_log_open(3)>.
200 =item B<OSSL_CMP_OPT_KEEP_ALIVE>
202 If the given value is 0 then HTTP connections are not kept open
203 after receiving a response, which is the default behavior for HTTP 1.0.
204 If the value is 1 or 2 then persistent connections are requested.
205 If the value is 2 then persistent connections are required,
206 i.e., in case the server does not grant them an error occurs.
207 The default value is 1: prefer to keep the connection open.
209 =item B<OSSL_CMP_OPT_MSG_TIMEOUT>
211 Number of seconds a CMP request-response message round trip
212 is allowed to take before a timeout error is returned.
213 A value <= 0 means no limitation (waiting indefinitely).
214 Default is to use the B<OSSL_CMP_OPT_TOTAL_TIMEOUT> setting.
216 =item B<OSSL_CMP_OPT_TOTAL_TIMEOUT>
218 Maximum total number of seconds a transaction may take,
219 including polling etc.
220 A value <= 0 means no limitation (waiting indefinitely).
223 =item B<OSSL_CMP_OPT_VALIDITY_DAYS>
225 Number of days new certificates are asked to be valid for.
227 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT>
229 Do not take default Subject Alternative Names
230 from the reference certificate.
232 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_CRITICAL>
234 Demand that the given Subject Alternative Names are flagged as critical.
236 =item B<OSSL_CMP_OPT_POLICIES_CRITICAL>
238 Demand that the given policies are flagged as critical.
240 =item B<OSSL_CMP_OPT_POPO_METHOD>
242 Select the proof of possession method to use. Possible values are:
244 OSSL_CRMF_POPO_NONE - ProofOfPossession field omitted
245 OSSL_CRMF_POPO_RAVERIFIED - assert that the RA has already
247 OSSL_CRMF_POPO_SIGNATURE - sign a value with private key,
248 which is the default.
249 OSSL_CRMF_POPO_KEYENC - decrypt the encrypted certificate
252 Note that a signature-based POPO can only be produced if a private key
253 is provided as the newPkey or client's pkey component of the CMP context.
255 =item B<OSSL_CMP_OPT_DIGEST_ALGNID>
257 The NID of the digest algorithm to be used in RFC 4210's MSG_SIG_ALG
258 for signature-based message protection and Proof-of-Possession (POPO).
261 =item B<OSSL_CMP_OPT_OWF_ALGNID>
262 The NID of the digest algorithm to be used as one-way function (OWF)
263 in RFC 4210's MSG_MAC_ALG for PBM-based message protection.
266 =item B<OSSL_CMP_OPT_MAC_ALGNID>
267 The NID of the MAC algorithm to be used in RFC 4210's MSG_MAC_ALG
268 for PBM-based message protection.
269 Default is HMAC-SHA1 as per RFC 4210.
271 =item B<OSSL_CMP_OPT_REVOCATION_REASON>
273 The reason code to be included in a Revocation Request (RR);
274 values: 0..10 (RFC 5210, 5.3.1) or -1 for none, which is the default.
276 =item B<OSSL_CMP_OPT_IMPLICIT_CONFIRM>
278 Request server to enable implicit confirm mode, where the client
279 does not need to send confirmation upon receiving the
280 certificate. If the server does not enable implicit confirmation
281 in the return message, then confirmation is sent anyway.
283 =item B<OSSL_CMP_OPT_DISABLE_CONFIRM>
285 Do not confirm enrolled certificates, to cope with broken servers
286 not supporting implicit confirmation correctly.
287 B<WARNING:> This setting leads to unspecified behavior and it is meant
288 exclusively to allow interoperability with server implementations violating
291 =item B<OSSL_CMP_OPT_UNPROTECTED_SEND>
293 Send request or response messages without CMP-level protection.
295 =item B<OSSL_CMP_OPT_UNPROTECTED_ERRORS>
297 Accept unprotected error responses which are either explicitly
298 unprotected or where protection verification failed. Applies to regular
299 error messages as well as certificate responses (IP/CP/KUP) and
300 revocation responses (RP) with rejection.
301 B<WARNING:> This setting leads to unspecified behavior and it is meant
302 exclusively to allow interoperability with server implementations violating
305 =item B<OSSL_CMP_OPT_IGNORE_KEYUSAGE>
307 Ignore key usage restrictions in the signer's certificate when
308 validating signature-based protection in received CMP messages.
309 Else, 'digitalSignature' must be allowed by CMP signer certificates.
311 =item B<OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR>
313 Allow retrieving a trust anchor from extraCerts and using that
314 to validate the certificate chain of an IP message.
318 OSSL_CMP_CTX_get_option() reads the current value of the given option
319 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) from the given OSSL_CMP_CTX structure.
321 OSSL_CMP_CTX_set_log_cb() sets in I<ctx> the callback function I<cb>
322 for handling error queue entries and logging messages.
323 When I<cb> is NULL errors are printed to STDERR (if available, else ignored)
324 any log messages are ignored.
325 Alternatively, L<OSSL_CMP_log_open(3)> may be used to direct logging to STDOUT.
327 OSSL_CMP_CTX_set_log_verbosity() is a macro setting the
328 OSSL_CMP_OPT_LOG_VERBOSITY context option to the given level.
330 OSSL_CMP_CTX_print_errors() outputs any entries in the OpenSSL error queue. It
331 is similar to L<ERR_print_errors_cb(3)> but uses the CMP log callback function
332 if set in the I<ctx> for uniformity with CMP logging if given. Otherwise it uses
333 L<ERR_print_errors(3)> to print to STDERR (unless OPENSSL_NO_STDIO is defined).
335 OSSL_CMP_CTX_set1_serverPath() sets the HTTP path of the CMP server on the host,
336 also known as "CMP alias".
339 OSSL_CMP_CTX_set1_server() sets the given server I<address>
340 (which may be a hostname or IP address or NULL) in the given I<ctx>.
342 OSSL_CMP_CTX_set_serverPort() sets the port of the CMP server to connect to.
343 If not used or the I<port> argument is 0
344 the default port applies, which is 80 for HTTP and 443 for HTTPS.
346 OSSL_CMP_CTX_set1_proxy() sets the HTTP proxy to be used for connecting to
347 the given CMP server unless overruled by any "no_proxy" settings (see below).
348 If TLS is not used this defaults to the value of
349 the environment variable C<http_proxy> if set, else C<HTTP_PROXY>.
350 Otherwise defaults to the value of C<https_proxy> if set, else C<HTTPS_PROXY>.
351 An empty proxy string specifies not to use a proxy.
352 Else the format is C<[http[s]://]address[:port][/path]>,
353 where any path given is ignored.
354 The default port number is 80, or 443 in case C<https:> is given.
356 OSSL_CMP_CTX_set1_no_proxy() sets the list of server hostnames not to use
357 an HTTP proxy for. The names may be separated by commas and/or whitespace.
358 Defaults to the environment variable C<no_proxy> if set, else C<NO_PROXY>.
360 OSSL_CMP_CTX_set_http_cb() sets the optional BIO connect/disconnect callback
361 function, which has the prototype
363 typedef BIO *(*HTTP_bio_cb_t) (BIO *bio, void *ctx, int connect, int detail);
365 The callback may modify the I<bio> provided by L<OSSL_CMP_MSG_http_perform(3)>,
366 whereby it may make use of a custom defined argument I<ctx>
367 stored in the OSSL_CMP_CTX by means of OSSL_CMP_CTX_set_http_cb_arg().
368 During connection establishment, just after calling BIO_do_connect_retry(),
369 the function is invoked with the I<connect> argument being 1 and the I<detail>
370 argument being 1 if HTTPS is requested, i.e., SSL/TLS should be enabled. On
371 disconnect I<connect> is 0 and I<detail> is 1 in case no error occurred, else 0.
372 For instance, on connect the function may prepend a TLS BIO to implement HTTPS;
373 after disconnect it may do some diagnostic output and/or specific cleanup.
374 The function should return NULL to indicate failure.
375 After disconnect the modified BIO will be deallocated using BIO_free_all().
377 OSSL_CMP_CTX_set_http_cb_arg() sets an argument, respectively a pointer to
378 a structure containing arguments,
379 optionally to be used by the http connect/disconnect callback function.
380 I<arg> is not consumed, and it must therefore explicitly be freed when not
381 needed any more. I<arg> may be NULL to clear the entry.
383 OSSL_CMP_CTX_get_http_cb_arg() gets the argument, respectively the pointer to a
384 structure containing arguments, previously set by
385 OSSL_CMP_CTX_set_http_cb_arg() or NULL if unset.
387 OSSL_CMP_CTX_set_transfer_cb() sets the message transfer callback function,
390 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t) (OSSL_CMP_CTX *ctx,
391 const OSSL_CMP_MSG *req);
393 Returns 1 on success, 0 on error.
395 Default is NULL, which implies the use of L<OSSL_CMP_MSG_http_perform(3)>.
396 The callback should send the CMP request message it obtains via the I<req>
397 parameter and on success return the response, else it must return NULL.
398 The transfer callback may make use of a custom defined argument stored in
399 the ctx by means of OSSL_CMP_CTX_set_transfer_cb_arg(), which may be retrieved
400 again through OSSL_CMP_CTX_get_transfer_cb_arg().
402 OSSL_CMP_CTX_set_transfer_cb_arg() sets an argument, respectively a pointer to a
403 structure containing arguments, optionally to be used by the transfer callback.
404 I<arg> is not consumed, and it must therefore explicitly be freed when not
405 needed any more. I<arg> may be NULL to clear the entry.
407 OSSL_CMP_CTX_get_transfer_cb_arg() gets the argument, respectively the pointer
408 to a structure containing arguments, previously set by
409 OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
411 OSSL_CMP_CTX_set1_srvCert() sets the expected server cert in I<ctx> and trusts
412 it directly (even if it is expired) when verifying signed response messages.
413 This pins the accepted CMP server and
414 results in ignoring whatever may be set using OSSL_CMP_CTX_set0_trustedStore().
415 Any previously set value is freed.
416 The I<cert> argument may be NULL to clear the entry.
417 If set, the subject of the certificate is also used
418 as default value for the recipient of CMP requests
419 and as default value for the expected sender of CMP responses.
421 OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN)
422 expected in the sender field of incoming CMP messages.
423 Defaults to the subject of the pinned server certificate, if any.
424 This can be used to make sure that only a particular entity is accepted as
425 CMP message signer, and attackers are not able to use arbitrary certificates
426 of a trusted PKI hierarchy to fraudulently pose as CMP server.
427 Note that this gives slightly more freedom than OSSL_CMP_CTX_set1_srvCert(),
428 which pins the server to the holder of a particular certificate, while the
429 expected sender name will continue to match after updates of the server cert.
431 OSSL_CMP_CTX_set0_trustedStore()
432 sets in the CMP context I<ctx> the certificate store of type X509_STORE
433 containing trusted certificates, typically of root CAs.
434 This is ignored when a certificate is pinned using OSSL_CMP_CTX_set1_srvCert().
435 The store may also hold CRLs and a certificate verification callback function
436 used for signature-based peer authentication.
437 Any store entry already set before is freed.
438 When given a NULL parameter the entry is cleared.
440 OSSL_CMP_CTX_get0_trustedStore()
441 extracts from the CMP context I<ctx> the pointer to the currently set
442 certificate store containing trust anchors etc., or an empty store if unset.
444 OSSL_CMP_CTX_set1_untrusted() sets up a list of non-trusted certificates
445 of intermediate CAs that may be useful for path construction for the own CMP
446 signer certificate, for the own TLS certificate (if any), when verifying peer
447 CMP protection certificates, and when verifying newly enrolled certificates.
448 The reference counts of those certificates handled successfully are increased.
450 OSSL_CMP_CTX_get0_untrusted(OSSL_CMP_CTX *ctx) returns a pointer to the
451 list of untrusted certs, which may be empty if unset.
453 OSSL_CMP_CTX_set1_cert() sets the CMP signer certificate
454 related to the private key used for CMP message protection.
455 Therefore the public key of this I<cert> must correspond to
456 the private key set before or thereafter via OSSL_CMP_CTX_set1_pkey().
457 When using signature-based protection of CMP request messages
458 this CMP signer certificate will be included first in the extraCerts field.
459 It serves as fallback reference certificate, see OSSL_CMP_CTX_set1_oldCert().
460 The subject of this I<cert> will be used as the sender field of outgoing
461 messages, while the subject of any cert set via OSSL_CMP_CTX_set1_oldCert()
462 and any value set via OSSL_CMP_CTX_set1_subjectName() are used as fallback.
464 The I<cert> argument may be NULL to clear the entry.
466 OSSL_CMP_CTX_build_cert_chain() builds a certificate chain for the CMP signer
467 certificate previously set in the I<ctx>. It adds the optional I<candidates>,
468 a list of intermediate CA certs that may already constitute the targeted chain,
469 to the untrusted certs that may already exist in the I<ctx>.
470 Then the function uses this augmented set of certs for chain construction.
471 If I<own_trusted> is NULL it builds the chain as far down as possible and
472 ignores any verification errors. Else the CMP signer certificate must be
473 verifiable where the chain reaches a trust anchor contained in I<own_trusted>.
474 On success the function stores the resulting chain in I<ctx>
475 for inclusion in the extraCerts field of signature-protected messages.
476 Calling this function is optional; by default a chain construction
477 is performed on demand that is equivalent to calling this function
478 with the I<candidates> and I<own_trusted> arguments being NULL.
480 OSSL_CMP_CTX_set1_pkey() sets the client's private key corresponding to the
481 CMP signer certificate set via OSSL_CMP_CTX_set1_cert().
482 This key is used create signature-based protection (protectionAlg = MSG_SIG_ALG)
484 unless a PBM secret has been set via OSSL_CMP_CTX_set1_secretValue().
485 The I<pkey> argument may be NULL to clear the entry.
487 OSSL_CMP_CTX_set1_secretValue() sets the byte string I<sec> with length I<len>
488 as PBM secret in the given I<ctx> or clears it if the I<sec> argument is NULL.
489 If present, this secret is used to create PBM-based protection of outgoing
490 messages and to verify any PBM-based protection of incoming messages
491 (protectionAlg = MSG_MAC_ALG). PBM stands for Password-Based MAC.
492 PBM-based protection takes precedence over signature-based protection.
494 OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue I<ref> with
495 length I<len> in the given I<ctx> or clears it if the I<ref> argument is NULL.
496 According to RFC 4210 section 5.1.1, if no value for the sender field in
497 CMP message headers can be determined (i.e., no CMP signer certificate
498 and no subject DN is set via OSSL_CMP_CTX_set1_subjectName()
499 then the sender field will contain the NULL-DN
500 and the senderKID field of the CMP message header must be set.
501 When signature-based protection is used the senderKID will be set to
502 the subjectKeyIdentifier of the CMP signer certificate as far as present.
503 If not present or when PBM-based protection is used
504 the I<ref> value is taken as the fallback value for the senderKID.
506 OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
507 PKIHeader of CMP request messages, i.e. the X509 name of the (CA) server.
509 The recipient field in the header of a CMP message is mandatory.
510 If not given explicitly the recipient is determined in the following order:
511 the subject of the CMP server certificate set using OSSL_CMP_CTX_set1_srvCert(),
512 the value set using OSSL_CMP_CTX_set1_issuer(),
513 the issuer of the certificate set using OSSL_CMP_CTX_set1_oldCert(),
514 the issuer of the CMP signer certificate,
515 as far as any of those is present, else the NULL-DN as last resort.
517 OSSL_CMP_CTX_push0_geninfo_ITAV() adds I<itav> to the stack in the I<ctx> to be
518 added to the GeneralInfo field of the CMP PKIMessage header of a request
519 message sent with this context.
521 OSSL_CMP_CTX_reset_geninfo_ITAVs()
522 clears any ITAVs that were added by OSSL_CMP_CTX_push0_geninfo_ITAV().
524 OSSL_CMP_CTX_set1_extraCertsOut() sets the stack of extraCerts that will be
527 OSSL_CMP_CTX_set0_newPkey() can be used to explicitly set the given EVP_PKEY
528 structure as the private or public key to be certified in the CMP context.
529 The I<priv> parameter must be 0 if and only if the given key is a public key.
531 OSSL_CMP_CTX_get0_newPkey() gives the key to use for certificate enrollment
532 dependent on fields of the CMP context structure:
533 the newPkey (which may be a private or public key) if present,
534 else the public key in the p10CSR if present, else the client's private key.
535 If the I<priv> parameter is not 0 and the selected key does not have a
536 private component then NULL is returned.
538 OSSL_CMP_CTX_set1_issuer() sets the name of the intended issuer that
539 will be set in the CertTemplate, i.e., the X509 name of the CA server.
541 OSSL_CMP_CTX_set1_subjectName() sets the subject DN that will be used in
542 the CertTemplate structure when requesting a new cert. For Key Update Requests
543 (KUR), it defaults to the subject DN of the reference certificate,
544 see OSSL_CMP_CTX_set1_oldCert(). This default is used for Initialization
545 Requests (IR) and Certification Requests (CR) only if no SANs are set.
546 The I<subjectName> is also used as fallback for the sender field
547 of outgoing CMP messages if no reference certificate is available.
549 OSSL_CMP_CTX_push1_subjectAltName() adds the given X509 name to the list of
550 alternate names on the certificate template request. This cannot be used if
551 any Subject Alternative Name extension is set via
552 OSSL_CMP_CTX_set0_reqExtensions().
553 By default, unless B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT> has been set,
554 the Subject Alternative Names are copied from the reference certificate,
555 see OSSL_CMP_CTX_set1_oldCert().
556 If set and the subject DN is not set with OSSL_CMP_CTX_set1_subjectName() then
557 the certificate template of an IR and CR will not be filled with the default
558 subject DN from the reference certificate.
559 If a subject DN is desired it needs to be set explicitly with
560 OSSL_CMP_CTX_set1_subjectName().
562 OSSL_CMP_CTX_set0_reqExtensions() sets the X.509v3 extensions to be used in
565 OSSL_CMP_CTX_reqExtensions_have_SAN() returns 1 if the context contains
566 a Subject Alternative Name extension, else 0 or -1 on error.
568 OSSL_CMP_CTX_push0_policy() adds the certificate policy info object
569 to the X509_EXTENSIONS of the requested certificate template.
571 OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
572 Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
573 It must be given for RR, else it defaults to the CMP signer certificate.
574 The I<reference certificate> determined in this way, if any, is also used for
575 deriving default subject DN, public key, Subject Alternative Names, and the
576 default issuer entry in the requested certificate template of IR/CR/KUR.
577 The subject of the reference certificate is used as the sender field value
578 in CMP message headers.
579 Its issuer is used as default recipient in CMP message headers.
581 OSSL_CMP_CTX_set1_p10CSR() sets the PKCS#10 CSR to use in P10CR messages.
582 If such a CSR is provided, its subject, public key, and extension fields are
583 also used as fallback values for the certificate template of IR/CR/KUR messages.
585 OSSL_CMP_CTX_push0_genm_ITAV() adds I<itav> to the stack in the I<ctx> which
586 will be the body of a General Message sent with this context.
588 OSSL_CMP_certConf_cb() is the default certificate confirmation callback function.
589 If the callback argument is not NULL it must point to a trust store.
590 In this case the function checks that the newly enrolled certificate can be
591 verified using this trust store and untrusted certificates from the I<ctx>,
592 which have been augmented by the list of extraCerts received.
593 During this verification, any certificate status checking is disabled.
594 If the callback argument is NULL the function tries building an approximate
595 chain as far as possible using the same untrusted certificates from the I<ctx>,
596 and if this fails it takes the received extraCerts as fallback.
597 The resulting cert chain can be retrieved using OSSL_CMP_CTX_get1_newChain().
599 OSSL_CMP_CTX_set_certConf_cb() sets the callback used for evaluating the newly
600 enrolled certificate before the library sends, depending on its result,
601 a positive or negative certConf message to the server. The callback has type
603 typedef int (*OSSL_CMP_certConf_cb_t) (OSSL_CMP_CTX *ctx, X509 *cert,
604 int fail_info, const char **txt);
606 and should inspect the certificate it obtains via the I<cert> parameter and may
607 overrule the pre-decision given in the I<fail_info> and I<*txt> parameters.
608 If it accepts the certificate it must return 0, indicating success. Else it must
609 return a bit field reflecting PKIFailureInfo with at least one failure bit and
610 may set the I<*txt> output parameter to point to a string constant with more
611 detail. The transfer callback may make use of a custom defined argument stored
612 in the I<ctx> by means of OSSL_CMP_CTX_set_certConf_cb_arg(), which may be
613 retrieved again through OSSL_CMP_CTX_get_certConf_cb_arg().
614 Typically, the callback will check at least that the certificate can be verified
615 using a set of trusted certificates.
616 It also could compare the subject DN and other fields of the newly
617 enrolled certificate with the certificate template of the request.
619 OSSL_CMP_CTX_set_certConf_cb_arg() sets an argument, respectively a pointer to a
620 structure containing arguments, optionally to be used by the certConf callback.
621 I<arg> is not consumed, and it must therefore explicitly be freed when not
622 needed any more. I<arg> may be NULL to clear the entry.
624 OSSL_CMP_CTX_get_certConf_cb_arg() gets the argument, respectively the pointer
625 to a structure containing arguments, previously set by
626 OSSL_CMP_CTX_set_certConf_cb_arg(), or NULL if unset.
628 OSSL_CMP_CTX_get_status() returns for client contexts the PKIstatus from
629 the last received CertRepMessage or Revocation Response or error message:
630 =item B<OSSL_CMP_PKISTATUS_accepted> on sucessful receipt of a GENP message:
634 =item B<OSSL_CMP_PKISTATUS_request>
636 if an IR/CR/KUR/RR/GENM request message could not be produced,
638 =item B<OSSL_CMP_PKISTATUS_trans>
640 on a transmission error or transaction error for this type of request, and
642 =item B<OSSL_CMP_PKISTATUS_unspecified>
644 if no such request was attempted or OSSL_CMP_CTX_reinit() has been called.
648 For server contexts it returns
649 B<OSSL_CMP_PKISTATUS_trans> if a transaction is open,
650 otherwise B<OSSL_CMP_PKISTATUS_unspecified>.
652 OSSL_CMP_CTX_get0_statusString() returns the statusString from the last received
653 CertRepMessage or Revocation Response or error message, or NULL if unset.
655 OSSL_CMP_CTX_get_failInfoCode() returns the error code from the failInfo field
656 of the last received CertRepMessage or Revocation Response or error message,
657 or -1 if no such response was received or OSSL_CMP_CTX_reinit() has been called.
658 This is a bit field and the flags for it are specified in the header file
659 F<< <openssl/cmp.h> >>.
660 The flags start with OSSL_CMP_CTX_FAILINFO, for example:
661 OSSL_CMP_CTX_FAILINFO_badAlg. Returns -1 if the failInfoCode field is unset.
663 OSSL_CMP_CTX_get0_newCert() returns the pointer to the newly obtained
664 certificate in case it is available, else NULL.
666 OSSL_CMP_CTX_get1_newChain() returns a pointer to a duplicate of the stack of
667 X.509 certificates computed by OSSL_CMP_certConf_cb() (if this function has
668 been called) on the last received certificate response message IP/CP/KUP.
670 OSSL_CMP_CTX_get1_caPubs() returns a pointer to a duplicate of the list of
671 X.509 certificates in the caPubs field of the last received certificate
672 response message (of type IP, CP, or KUP),
673 or an empty stack if no caPubs have been received in the current transaction.
675 OSSL_CMP_CTX_get1_extraCertsIn() returns a pointer to a duplicate of the list
676 of X.509 certificates contained in the extraCerts field of the last received
677 response message (except for pollRep and PKIConf), or
678 an empty stack if no extraCerts have been received in the current transaction.
680 OSSL_CMP_CTX_set1_transactionID() sets the given transaction ID in the given
681 OSSL_CMP_CTX structure.
683 OSSL_CMP_CTX_set1_senderNonce() stores the last sent sender I<nonce> in
684 the I<ctx>. This will be used to validate the recipNonce in incoming messages.
688 CMP is defined in RFC 4210 (and CRMF in RFC 4211).
692 OSSL_CMP_CTX_free() and OSSL_CMP_CTX_print_errors() do not return anything.
695 OSSL_CMP_CTX_get_http_cb_arg(),
696 OSSL_CMP_CTX_get_transfer_cb_arg(),
697 OSSL_CMP_CTX_get0_trustedStore(),
698 OSSL_CMP_CTX_get0_untrusted(),
699 OSSL_CMP_CTX_get0_newPkey(),
700 OSSL_CMP_CTX_get_certConf_cb_arg(),
701 OSSL_CMP_CTX_get0_statusString(),
702 OSSL_CMP_CTX_get0_newCert(),
703 OSSL_CMP_CTX_get0_newChain(),
704 OSSL_CMP_CTX_get1_caPubs(), and
705 OSSL_CMP_CTX_get1_extraCertsIn()
706 return the intended pointer value as described above or NULL on error.
708 OSSL_CMP_CTX_get_option(),
709 OSSL_CMP_CTX_reqExtensions_have_SAN(),
710 OSSL_CMP_CTX_get_status(), and
711 OSSL_CMP_CTX_get_failInfoCode()
712 return the intended value as described above or -1 on error.
714 OSSL_CMP_certConf_cb() returns I<fail_info> if it is not equal to 0,
715 else 0 on successful validation,
716 or else a bit field with the B<OSSL_CMP_PKIFAILUREINFO_incorrectData> bit set.
718 All other functions, including OSSL_CMP_CTX_reinit()
719 and OSSL_CMP_CTX_reset_geninfo_ITAVs(),
720 return 1 on success, 0 on error.
724 The following code omits error handling.
726 Set up a CMP client context for sending requests and verifying responses:
728 cmp_ctx = OSSL_CMP_CTX_new();
729 OSSL_CMP_CTX_set1_server(cmp_ctx, name_or_address);
730 OSSL_CMP_CTX_set1_serverPort(cmp_ctx, port_string);
731 OSSL_CMP_CTX_set1_serverPath(cmp_ctx, path_or_alias);
732 OSSL_CMP_CTX_set0_trustedStore(cmp_ctx, ts);
734 Set up client credentials for password-based protection (PBM):
736 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
737 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
739 Set up the details for certificate requests:
741 OSSL_CMP_CTX_set1_subjectName(cmp_ctx, name);
742 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, initialKey);
744 Perform an Initialization Request transaction:
746 initialCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
748 Reset the transaction state of the CMP context and the credentials:
750 OSSL_CMP_CTX_reinit(cmp_ctx);
751 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, NULL, 0);
752 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, NULL, 0);
754 Perform a Certification Request transaction, making use of the new credentials:
756 OSSL_CMP_CTX_set1_cert(cmp_ctx, initialCert);
757 OSSL_CMP_CTX_set1_pkey(cmp_ctx, initialKey);
758 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, curentKey);
759 currentCert = OSSL_CMP_exec_CR_ses(cmp_ctx);
761 Perform a Key Update Request, signed using the cert (and key) to be updated:
763 OSSL_CMP_CTX_reinit(cmp_ctx);
764 OSSL_CMP_CTX_set1_cert(cmp_ctx, currentCert);
765 OSSL_CMP_CTX_set1_pkey(cmp_ctx, currentKey);
766 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, updatedKey);
767 currentCert = OSSL_CMP_exec_KUR_ses(cmp_ctx);
768 currentKey = updatedKey;
770 Perform a General Message transaction including, as an example,
771 the id-it-signKeyPairTypes OID and prints info on the General Response contents:
773 OSSL_CMP_CTX_reinit(cmp_ctx);
775 ASN1_OBJECT *type = OBJ_txt2obj("1.3.6.1.5.5.7.4.2", 1);
776 OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_create(type, NULL);
777 OSSL_CMP_CTX_push0_genm_ITAV(cmp_ctx, itav);
779 STACK_OF(OSSL_CMP_ITAV) *itavs;
780 itavs = OSSL_CMP_exec_GENM_ses(cmp_ctx);
782 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
786 L<OSSL_CMP_exec_IR_ses(3)>, L<OSSL_CMP_exec_CR_ses(3)>,
787 L<OSSL_CMP_exec_KUR_ses(3)>, L<OSSL_CMP_exec_GENM_ses(3)>,
788 L<OSSL_CMP_exec_certreq(3)>, L<OSSL_CMP_MSG_http_perform(3)>,
789 L<ERR_print_errors_cb(3)>
793 The OpenSSL CMP support was added in OpenSSL 3.0.
795 OSSL_CMP_CTX_reset_geninfo_ITAVs() was added in OpenSSL 3.0.8.
799 Copyright 2007-2023 The OpenSSL Project Authors. All Rights Reserved.
801 Licensed under the Apache License 2.0 (the "License"). You may not use
802 this file except in compliance with the License. You can obtain a copy
803 in the file LICENSE in the source distribution or at
804 L<https://www.openssl.org/source/license.html>.