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_certs,
30 OSSL_CMP_CTX_get0_untrusted_certs,
31 OSSL_CMP_CTX_set1_cert,
32 OSSL_CMP_CTX_set1_pkey,
33 OSSL_CMP_CTX_set1_referenceValue,
34 OSSL_CMP_CTX_set1_secretValue,
35 OSSL_CMP_CTX_set1_recipient,
36 OSSL_CMP_CTX_push0_geninfo_ITAV,
37 OSSL_CMP_CTX_set1_extraCertsOut,
38 OSSL_CMP_CTX_set0_newPkey,
39 OSSL_CMP_CTX_get0_newPkey,
40 OSSL_CMP_CTX_set1_issuer,
41 OSSL_CMP_CTX_set1_subjectName,
42 OSSL_CMP_CTX_push1_subjectAltName,
43 OSSL_CMP_CTX_set0_reqExtensions,
44 OSSL_CMP_CTX_reqExtensions_have_SAN,
45 OSSL_CMP_CTX_push0_policy,
46 OSSL_CMP_CTX_set1_oldCert,
47 OSSL_CMP_CTX_set1_p10CSR,
48 OSSL_CMP_CTX_push0_genm_ITAV,
49 OSSL_CMP_certConf_cb_t,
50 OSSL_CMP_CTX_set_certConf_cb,
51 OSSL_CMP_CTX_set_certConf_cb_arg,
52 OSSL_CMP_CTX_get_certConf_cb_arg,
53 OSSL_CMP_CTX_get_status,
54 OSSL_CMP_CTX_get0_statusString,
55 OSSL_CMP_CTX_get_failInfoCode,
56 OSSL_CMP_CTX_get0_newCert,
57 OSSL_CMP_CTX_get1_caPubs,
58 OSSL_CMP_CTX_get1_extraCertsIn,
59 OSSL_CMP_CTX_set1_transactionID,
60 OSSL_CMP_CTX_set1_senderNonce
61 - functions for managing the CMP client context data structure
65 #include <openssl/cmp.h>
67 OSSL_CMP_CTX *OSSL_CMP_CTX_new(OPENSSL_CTX *libctx, const char *propq);
68 void OSSL_CMP_CTX_free(OSSL_CMP_CTX *ctx);
69 int OSSL_CMP_CTX_reinit(OSSL_CMP_CTX *ctx);
70 int OSSL_CMP_CTX_set_option(OSSL_CMP_CTX *ctx, int opt, int val);
71 int OSSL_CMP_CTX_get_option(const OSSL_CMP_CTX *ctx, int opt);
73 /* logging and error reporting: */
74 int OSSL_CMP_CTX_set_log_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_log_cb_t cb);
75 #define OSSL_CMP_CTX_set_log_verbosity(ctx, level)
76 void OSSL_CMP_CTX_print_errors(const OSSL_CMP_CTX *ctx);
78 /* message transfer: */
79 int OSSL_CMP_CTX_set1_serverPath(OSSL_CMP_CTX *ctx, const char *path);
80 int OSSL_CMP_CTX_set1_server(OSSL_CMP_CTX *ctx, const char *address);
81 int OSSL_CMP_CTX_set_serverPort(OSSL_CMP_CTX *ctx, int port);
82 int OSSL_CMP_CTX_set1_proxy(OSSL_CMP_CTX *ctx, const char *name);
83 int OSSL_CMP_CTX_set1_no_proxy(OSSL_CMP_CTX *ctx, const char *names);
84 int OSSL_CMP_CTX_set_http_cb(OSSL_CMP_CTX *ctx, HTTP_bio_cb_t cb);
85 int OSSL_CMP_CTX_set_http_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
86 void *OSSL_CMP_CTX_get_http_cb_arg(const OSSL_CMP_CTX *ctx);
87 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t)(OSSL_CMP_CTX *ctx,
88 const OSSL_CMP_MSG *req);
89 int OSSL_CMP_CTX_set_transfer_cb(OSSL_CMP_CTX *ctx,
90 OSSL_CMP_transfer_cb_t cb);
91 int OSSL_CMP_CTX_set_transfer_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
92 void *OSSL_CMP_CTX_get_transfer_cb_arg(const OSSL_CMP_CTX *ctx);
94 /* server authentication: */
95 int OSSL_CMP_CTX_set1_srvCert(OSSL_CMP_CTX *ctx, X509 *cert);
96 int OSSL_CMP_CTX_set1_expected_sender(OSSL_CMP_CTX *ctx,
97 const X509_NAME *name);
98 int OSSL_CMP_CTX_set0_trustedStore(OSSL_CMP_CTX *ctx, X509_STORE *store);
99 X509_STORE *OSSL_CMP_CTX_get0_trustedStore(const OSSL_CMP_CTX *ctx);
100 int OSSL_CMP_CTX_set1_untrusted_certs(OSSL_CMP_CTX *ctx,
101 STACK_OF(X509) *certs);
102 STACK_OF(X509) *OSSL_CMP_CTX_get0_untrusted_certs(const OSSL_CMP_CTX *ctx);
104 /* client authentication: */
105 int OSSL_CMP_CTX_set1_cert(OSSL_CMP_CTX *ctx, X509 *cert);
106 int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
107 int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
108 const unsigned char *ref, int len);
109 int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx, const unsigned char *sec,
112 /* CMP message header and extra certificates: */
113 int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
114 int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
115 int OSSL_CMP_CTX_set1_extraCertsOut(OSSL_CMP_CTX *ctx,
116 STACK_OF(X509) *extraCertsOut);
118 /* certificate template: */
119 int OSSL_CMP_CTX_set0_newPkey(OSSL_CMP_CTX *ctx, int priv, EVP_PKEY *pkey);
120 EVP_PKEY *OSSL_CMP_CTX_get0_newPkey(const OSSL_CMP_CTX *ctx, int priv);
121 int OSSL_CMP_CTX_set1_issuer(OSSL_CMP_CTX *ctx, const X509_NAME *name);
122 int OSSL_CMP_CTX_set1_subjectName(OSSL_CMP_CTX *ctx, const X509_NAME *name);
123 int OSSL_CMP_CTX_push1_subjectAltName(OSSL_CMP_CTX *ctx,
124 const GENERAL_NAME *name);
125 int OSSL_CMP_CTX_set0_reqExtensions(OSSL_CMP_CTX *ctx, X509_EXTENSIONS *exts);
126 int OSSL_CMP_CTX_reqExtensions_have_SAN(OSSL_CMP_CTX *ctx);
127 int OSSL_CMP_CTX_push0_policy(OSSL_CMP_CTX *ctx, POLICYINFO *pinfo);
128 int OSSL_CMP_CTX_set1_oldCert(OSSL_CMP_CTX *ctx, X509 *cert);
129 int OSSL_CMP_CTX_set1_p10CSR(OSSL_CMP_CTX *ctx, const X509_REQ *csr);
131 /* misc body contents: */
132 int OSSL_CMP_CTX_push0_genm_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
134 /* certificate confirmation: */
135 typedef int (*OSSL_CMP_certConf_cb_t)(OSSL_CMP_CTX *ctx, X509 *cert,
136 int fail_info, const char **txt);
137 int OSSL_CMP_CTX_set_certConf_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_certConf_cb_t cb);
138 int OSSL_CMP_CTX_set_certConf_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
139 void *OSSL_CMP_CTX_get_certConf_cb_arg(const OSSL_CMP_CTX *ctx);
141 /* result fetching: */
142 int OSSL_CMP_CTX_get_status(const OSSL_CMP_CTX *ctx);
143 OSSL_CMP_PKIFREETEXT *OSSL_CMP_CTX_get0_statusString(const OSSL_CMP_CTX *ctx);
144 int OSSL_CMP_CTX_get_failInfoCode(const OSSL_CMP_CTX *ctx);
146 X509 *OSSL_CMP_CTX_get0_newCert(const OSSL_CMP_CTX *ctx);
147 STACK_OF(X509) *OSSL_CMP_CTX_get1_caPubs(const OSSL_CMP_CTX *ctx);
148 STACK_OF(X509) *OSSL_CMP_CTX_get1_extraCertsIn(const OSSL_CMP_CTX *ctx);
150 /* for testing and debugging purposes: */
151 int OSSL_CMP_CTX_set1_transactionID(OSSL_CMP_CTX *ctx,
152 const ASN1_OCTET_STRING *id);
153 int OSSL_CMP_CTX_set1_senderNonce(OSSL_CMP_CTX *ctx,
154 const ASN1_OCTET_STRING *nonce);
158 This is the context API for using CMP (Certificate Management Protocol) with
161 OSSL_CMP_CTX_new() allocates an B<OSSL_CMP_CTX> structure associated with
162 the library context I<libctx> and property query string I<propq>,
163 both of which may be NULL to select the defaults.
164 It initializes the remaining fields to their default values - for instance,
165 the logging verbosity is set to OSSL_CMP_LOG_INFO,
166 the message timeout is set to 120 seconds,
167 and the proof-of-possession method is set to OSSL_CRMF_POPO_SIGNATURE.
169 OSSL_CMP_CTX_free() deallocates an OSSL_CMP_CTX structure.
171 OSSL_CMP_CTX_reinit() prepares the given B<ctx> for a further transaction by
172 clearing the internal CMP transaction (aka session) status, PKIStatusInfo,
173 and any previous results (newCert, caPubs, and extraCertsIn)
174 from the last executed transaction.
175 All other field values (i.e., CMP options) are retained for potential re-use.
177 OSSL_CMP_CTX_set_option() sets the given value for the given option
178 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) in the given OSSL_CMP_CTX structure.
180 The following options can be set:
184 =item B<OSSL_CMP_OPT_LOG_VERBOSITY>
186 The level of severity needed for actually outputting log messages
187 due to errors, warnings, general info, debugging, etc.
188 Default is OSSL_CMP_LOG_INFO. See also L<OSSL_CMP_log_open(3)>.
190 =item B<OSSL_CMP_OPT_MSG_TIMEOUT>
192 Number of seconds (or 0 for infinite) a CMP message round trip is
193 allowed to take before a timeout error is returned. Default is 120.
195 =item B<OSSL_CMP_OPT_TOTAL_TIMEOUT>
197 Maximum total number of seconds an enrollment (including polling)
198 may take. Default is 0 (infinite).
200 =item B<OSSL_CMP_OPT_VALIDITY_DAYS>
202 Number of days new certificates are asked to be valid for.
204 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT>
206 Do not take default Subject Alternative Names
207 from the reference certificate.
209 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_CRITICAL>
211 Demand that the given Subject Alternative Names are flagged as critical.
213 =item B<OSSL_CMP_OPT_POLICIES_CRITICAL>
215 Demand that the given policies are flagged as critical.
217 =item B<OSSL_CMP_OPT_POPO_METHOD>
219 Select the proof of possession method to use. Possible values are:
221 OSSL_CRMF_POPO_NONE - ProofOfPossession field omitted
222 OSSL_CRMF_POPO_RAVERIFIED - assert that the RA has already
224 OSSL_CRMF_POPO_SIGNATURE - sign a value with private key,
225 which is the default.
226 OSSL_CRMF_POPO_KEYENC - decrypt the encrypted certificate
229 Note that a signature-based POPO can only be produced if a private key
230 is provided as the newPkey or client pkey component of the CMP context.
232 =item B<OSSL_CMP_OPT_DIGEST_ALGNID>
234 The NID of the digest algorithm to be used in RFC 4210's MSG_SIG_ALG
235 for signature-based message protection and Proof-of-Possession (POPO).
238 =item B<OSSL_CMP_OPT_OWF_ALGNID>
239 The NID of the digest algorithm to be used as one-way function (OWF)
240 in RFC 4210's MSG_MAC_ALG for PBM-based message protection.
243 =item B<OSSL_CMP_OPT_MAC_ALGNID>
244 The NID of the MAC algorithm to be used in RFC 4210's MSG_MAC_ALG
245 for PBM-based message protection.
246 Default is HMAC-SHA1 as per RFC 4210.
248 =item B<OSSL_CMP_OPT_REVOCATION_REASON>
250 The reason code to be included in a Revocation Request (RR);
251 values: 0..10 (RFC 5210, 5.3.1) or -1 for none, which is the default.
253 =item B<OSSL_CMP_OPT_IMPLICIT_CONFIRM>
255 Request server to enable implicit confirm mode, where the client
256 does not need to send confirmation upon receiving the
257 certificate. If the server does not enable implicit confirmation
258 in the return message, then confirmation is sent anyway.
260 =item B<OSSL_CMP_OPT_DISABLE_CONFIRM>
262 Do not confirm enrolled certificates, to cope with broken servers
263 not supporting implicit confirmation correctly.
264 B<WARNING:> This setting leads to unspecified behavior and it is meant
265 exclusively to allow interoperability with server implementations violating
268 =item B<OSSL_CMP_OPT_UNPROTECTED_SEND>
270 Send messages without CMP-level protection.
272 =item B<OSSL_CMP_OPT_UNPROTECTED_ERRORS>
274 Accept unprotected error responses which are either explicitly
275 unprotected or where protection verification failed. Applies to regular
276 error messages as well as certificate responses (IP/CP/KUP) and
277 revocation responses (RP) with rejection.
278 B<WARNING:> This setting leads to unspecified behavior and it is meant
279 exclusively to allow interoperability with server implementations violating
282 =item B<OSSL_CMP_OPT_IGNORE_KEYUSAGE>
284 Ignore key usage restrictions in signer certificate when
285 validating signature-based protection in received CMP messages.
286 Else, 'digitalSignature' must be allowed by CMP signer certificates.
288 =item B<OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR>
290 Allow retrieving a trust anchor from extraCerts and using that
291 to validate the certificate chain of an IP message.
295 OSSL_CMP_CTX_get_option() reads the current value of the given option
296 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) from the given OSSL_CMP_CTX structure.
298 OSSL_CMP_CTX_set_log_cb() sets in B<ctx> the callback function C<cb>
299 for handling error queue entries and logging messages.
300 When C<cb> is NULL errors are printed to STDERR (if available, else ignored)
301 any log messages are ignored.
302 Alternatively, L<OSSL_CMP_log_open(3)> may be used to direct logging to STDOUT.
304 OSSL_CMP_CTX_set_log_verbosity() is a macro setting the
305 OSSL_CMP_OPT_LOG_VERBOSITY context option to the given level.
307 OSSL_CMP_CTX_print_errors() outputs any entries in the OpenSSL error queue.
308 It is similar to B<ERR_print_errors_cb()> but uses the CMP log callback function
309 if set in the C<ctx> for uniformity with CMP logging if given. Otherwise it uses
310 B<ERR_print_errors(3)> to print to STDERR (unless OPENSSL_NO_STDIO is defined).
312 OSSL_CMP_CTX_set1_serverPath() sets the HTTP path of the CMP server on the host,
313 also known as "CMP alias".
316 OSSL_CMP_CTX_set1_server() sets the given server B<address>
317 (which may be a hostname or IP address or NULL) in the given B<ctx>.
319 OSSL_CMP_CTX_set_serverPort() sets the port of the CMP server to connect to.
320 If not used or the B<port> argument is 0
321 the default port applies, which is 80 for HTTP and 443 for HTTPS.
323 OSSL_CMP_CTX_set1_proxy() sets the HTTP proxy to be used for connecting to
324 the given CMP server unless overruled by any "no_proxy" settings (see below).
325 If TLS is not used this defaults to the value of
326 the environment variable B<http_proxy> if set, else B<HTTP_PROXY>.
327 Otherwise defaults to the value of B<https_proxy> if set, else B<HTTPS_PROXY>.
328 An empty proxy string specifies not to use a proxy.
329 Else the format is I<[http[s]://]address[:port][/path]>,
330 where any path given is ignored.
331 The default port number is 80, or 443 in case I<https:> is given.
333 OSSL_CMP_CTX_set1_no_proxy() sets the list of server hostnames not to use
334 an HTTP proxy for. The names may be separated by commas and/or whitespace.
335 Defaults to the environment variable B<no_proxy> if set, else B<NO_PROXY>.
337 OSSL_CMP_CTX_set_http_cb() sets the optional BIO connect/disconnect callback
338 function, which has the prototype
340 typedef BIO *(*HTTP_bio_cb_t) (BIO *bio, void *ctx, int connect, int detail);
342 The callback may modify the BIO B<bio> provided by OSSL_CMP_MSG_http_perform(),
343 whereby it may make use of a custom defined argument B<ctx>
344 stored in the OSSL_CMP_CTX by means of OSSL_CMP_CTX_set_http_cb_arg().
345 During connection establishment, just after calling BIO_do_connect_retry(),
346 the function is invoked with the B<connect> argument being 1 and the B<detail>
347 argument being 1 if HTTPS is requested, i.e., SSL/TLS should be enabled. On
348 disconnect B<connect> is 0 and B<detail> is 1 in case no error occurred, else 0.
349 For instance, on connect the function may prepend a TLS BIO to implement HTTPS;
350 after disconnect it may do some diagnostic output and/or specific cleanup.
351 The function should return NULL to indicate failure.
352 After disconnect the modified BIO will be deallocated using BIO_free_all().
354 OSSL_CMP_CTX_set_http_cb_arg() sets an argument, respectively a pointer to
355 a structure containing arguments,
356 optionally to be used by the http connect/disconnect callback function.
357 B<arg> is not consumed, and it must therefore explicitly be freed when not
358 needed any more. B<arg> may be NULL to clear the entry.
360 OSSL_CMP_CTX_get_http_cb_arg() gets the argument, respectively the pointer to a
361 structure containing arguments, previously set by
362 OSSL_CMP_CTX_set_http_cb_arg() or NULL if unset.
364 OSSL_CMP_CTX_set_transfer_cb() sets the message transfer callback function,
367 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t) (OSSL_CMP_CTX *ctx,
368 const OSSL_CMP_MSG *req);
370 Returns 1 on success, 0 on error.
372 Default is NULL, which implies the use of L<OSSL_CMP_MSG_http_perform(3)>.
373 The callback should send the CMP request message it obtains via the B<req>
374 parameter and on success return the response, else it must return NULL.
375 The transfer callback may make use of a custom defined argument stored in
376 the ctx by means of OSSL_CMP_CTX_set_transfer_cb_arg(), which may be retrieved
377 again through OSSL_CMP_CTX_get_transfer_cb_arg().
379 OSSL_CMP_CTX_set_transfer_cb_arg() sets an argument, respectively a pointer to a
380 structure containing arguments, optionally to be used by the transfer callback.
381 B<arg> is not consumed, and it must therefore explicitly be freed when not
382 needed any more. B<arg> may be NULL to clear the entry.
384 OSSL_CMP_CTX_get_transfer_cb_arg() gets the argument, respectively the pointer
385 to a structure containing arguments, previously set by
386 OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
388 OSSL_CMP_CTX_set1_srvCert() sets the expected server cert B<srvCert> and trusts
389 it directly (even if it is expired) when verifying signed response messages.
390 May be used alternatively to OSSL_CMP_CTX_set0_trustedStore()
391 to pin the accepted server.
392 Any previously set value is freed.
393 The B<cert> argument may be NULL to clear the entry.
394 If set, the subject of the certificate is also used
395 as default value for the recipient of CMP requests
396 and as default value for the expected sender of CMP responses.
398 OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN)
399 expected in the sender field of CMP response messages.
400 Defaults to the subject of the pinned server certificate B<-srvcert>, if any.
401 This can be used to make sure that only a particular entity is accepted as
402 CMP message signer, and attackers are not able to use arbitrary certificates
403 of a trusted PKI hierarchy to fraudulently pose as CMP server.
404 Note that this gives slightly more freedom than OSSL_CMP_CTX_set1_srvCert(),
405 which pins the server to the holder of a particular certificate, while the
406 expected sender name will continue to match after updates of the server cert.
408 OSSL_CMP_CTX_set0_trustedStore() sets the certificate store of type X509_STORE
409 containing trusted (root) CA certificates.
410 The store may also hold CRLs and
411 a certificate verification callback function used for CMP server authentication.
412 Any store entry already set before is freed.
413 When given a NULL parameter the entry is cleared.
415 OSSL_CMP_CTX_get0_trustedStore() returns a pointer to the currently set
416 certificate store containing trusted cert etc., or an empty store if unset.
418 OSSL_CMP_CTX_set1_untrusted_certs() sets up a list of non-trusted certificates
419 of intermediate CAs that may be useful for path construction for the CMP client
420 certificate, for the TLS client certificate (if any), when verifying
421 the CMP server certificate, and when verifying newly enrolled certificates.
422 The reference counts of those certificates handled successfully are increased.
424 OSSL_CMP_CTX_get0_untrusted_certs(OSSL_CMP_CTX *ctx) returns a pointer to the
425 list of untrusted certs, which may be empty if unset.
427 OSSL_CMP_CTX_set1_cert() sets the certificate used for CMP message protection.
428 The public key of this B<cert> must correspond to
429 the private key set via B<OSSL_CMP_CTX_set1_pkey()>.
430 When using signature-based protection of CMP request messages
431 this "protection certificate" will be included first in the extraCerts field.
432 The subject of this B<cert> will be used as the sender field of outgoing
433 messages, while the subject of any cert set via B<OSSL_CMP_CTX_set1_oldCert()>
434 and any value set via B<OSSL_CMP_CTX_set1_subjectName()> are used as fallback.
435 The B<cert> argument may be NULL to clear the entry.
437 OSSL_CMP_CTX_set1_pkey() sets the private key corresponding to the
438 protection certificate B<cert> set via B<OSSL_CMP_CTX_set1_cert()>.
439 This key is used create signature-based protection (protectionAlg = MSG_SIG_ALG)
441 unless a PBM secret has been set via B<OSSL_CMP_CTX_set1_secretValue()>.
442 The B<pkey> argument may be NULL to clear the entry.
444 OSSL_CMP_CTX_set1_secretValue() sets the byte string B<sec> with length B<len>
445 as PBM secret in the given B<ctx> or clears it if the B<sec> argument is NULL.
446 If present, this secret is used to create PBM-based protection of outgoing
447 messages and to verify any PBM-based protection of incoming messages
448 (protectionAlg = MSG_MAC_ALG). PBM stands for Password-Based MAC.
449 PBM-based protection takes precedence over signature-based protection.
451 OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue B<ref> with
452 length B<len> in the given B<ctx> or clears it if the B<ref> argument is NULL.
453 According to RFC 4210 section 5.1.1, if no value for the sender field in
454 CMP message headers can be determined (i.e., no protection certificate B<cert>
455 and no B<subjectName> is given) then the sender field will contain the NULL-DN
456 and the senderKID field of the CMP message header must be set.
457 When signature-based protection is used the senderKID will be set to
458 the subjectKeyIdentifier of the protection B<cert> as far as present.
459 If not present or when PBM-based protection is used
460 the B<ref> value is taken as the fallback value for the senderKID.
462 OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
463 PKIHeader of CMP request messages, i.e. the X509 name of the (CA) server.
465 The recipient field in the header of a CMP message is mandatory.
466 If not given explicitly the recipient is determined in the following order:
467 the subject of the CMP server certificate set using OSSL_CMP_CTX_set1_srvCert(),
468 the value set using OSSL_CMP_CTX_set1_issuer(),
469 the issuer of the certificate set using OSSL_CMP_CTX_set1_oldCert(),
470 the issuer of the protection certificate (B<cert>),
471 as far as any of those is present, else the NULL-DN as last resort.
473 OSSL_CMP_CTX_push0_geninfo_ITAV() adds B<itav> to the stack in the B<ctx> to be
474 added to the GeneralInfo field of the CMP PKIMessage header of a request
475 message sent with this context.
477 OSSL_CMP_CTX_set1_extraCertsOut() sets the stack of extraCerts that will be
480 OSSL_CMP_CTX_set0_newPkey() can be used to explicitly set the given EVP_PKEY
481 structure as the private or public key to be certified in the CMP context.
482 The B<priv> parameter must be 0 if and only if the given key is a public key.
484 OSSL_CMP_CTX_get0_newPkey() gives the key to use for certificate enrollment
485 dependent on fields of the CMP context structure:
486 the newPkey (which may be a private or public key) if present,
487 else the public key in the p10CSR if present, else the client private key.
488 If the B<priv> parameter is not 0 and the selected key does not have a
489 private component then NULL is returned.
491 OSSL_CMP_CTX_set1_issuer() sets the name of the intended issuer that
492 will be set in the CertTemplate, i.e., the X509 name of the CA server.
494 OSSL_CMP_CTX_set1_subjectName() sets the subject DN that will be used in
495 the CertTemplate structure when requesting a new cert. For Key Update Requests
496 (KUR), it defaults to the subject DN of the B<reference certificate>,
497 see B<OSSL_CMP_CTX_set1_oldCert()>. This default is used for Initialization
498 Requests (IR) and Certification Requests (CR) only if no SANs are set.
499 The B<subjectName> is also used as fallback for the sender field
500 of outgoing CMP messages if no B<cert> and no B<oldcert> are available.
502 OSSL_CMP_CTX_push1_subjectAltName() adds the given X509 name to the list of
503 alternate names on the certificate template request. This cannot be used if
504 any Subject Alternative Name extension is set via
505 OSSL_CMP_CTX_set0_reqExtensions().
506 By default, unless OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT has been set,
507 the Subject Alternative Names are copied from the B<reference certificate>,
508 see B<OSSL_CMP_CTX_set1_oldCert()>.
509 If set and the subject DN is not set with OSSL_CMP_CTX_set1_subjectName(), then
510 the certificate template of an IR and CR will not be filled with the default
511 subject DN from the B<reference certificate>.
512 If a subject DN is desired it needs to be set explicitly with
513 OSSL_CMP_CTX_set1_subjectName().
515 OSSL_CMP_CTX_set0_reqExtensions() sets the X.509v3 extensions to be used in
518 OSSL_CMP_CTX_reqExtensions_have_SAN() returns 1 if the context contains
519 a Subject Alternative Name extension, else 0 or -1 on error.
521 OSSL_CMP_CTX_push0_policy() adds the certificate policy info object
522 to the X509_EXTENSIONS of the requested certificate template.
524 OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
525 Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
526 It must be given for RR, else it defaults to the protection B<cert>.
527 The B<reference certificate> determined in this way, if any, is also used for
528 deriving default subject DN and Subject Alternative Names for IR, CR, and KUR.
529 Its subject is used as sender in CMP message headers if no protection cert is given.
530 Its issuer is used as default recipient in CMP message headers.
532 OSSL_CMP_CTX_set1_p10CSR() sets the PKCS#10 CSR to be used in P10CR.
534 OSSL_CMP_CTX_push0_genm_ITAV() adds B<itav> to the stack in the B<ctx> which
535 will be the body of a General Message sent with this context.
537 OSSL_CMP_CTX_set_certConf_cb() sets the callback used for evaluating the newly
538 enrolled certificate before the library sends, depending on its result,
539 a positive or negative certConf message to the server. The callback has type
541 typedef int (*OSSL_CMP_certConf_cb_t) (OSSL_CMP_CTX *ctx, X509 *cert,
542 int fail_info, const char **txt);
544 and should inspect the certificate it obtains via the B<cert> parameter and may
545 overrule the pre-decision given in the B<fail_info> and B<*txt> parameters.
546 If it accepts the certificate it must return 0, indicating success. Else it must
547 return a bit field reflecting PKIFailureInfo with at least one failure bit and
548 may set the B<*txt> output parameter to point to a string constant with more
549 detail. The transfer callback may make use of a custom defined argument stored
550 in the B<ctx> by means of OSSL_CMP_CTX_set_certConf_cb_arg(), which may be
551 retrieved again through OSSL_CMP_CTX_get_certConf_cb_arg().
552 Typically, the callback will check at least that the certificate can be verified
553 using a set of trusted certificates.
554 It also could compare the subject DN and other fields of the newly
555 enrolled certificate with the certificate template of the request.
557 OSSL_CMP_CTX_set_certConf_cb_arg() sets an argument, respectively a pointer to a
558 structure containing arguments, optionally to be used by the certConf callback.
559 B<arg> is not consumed, and it must therefore explicitly be freed when not
560 needed any more. B<arg> may be NULL to clear the entry.
562 OSSL_CMP_CTX_get_certConf_cb_arg() gets the argument, respectively the pointer
563 to a structure containing arguments, previously set by
564 OSSL_CMP_CTX_set_certConf_cb_arg(), or NULL if unset.
566 OSSL_CMP_CTX_get_status() returns the PKIstatus from the last received
567 CertRepMessage or Revocation Response or error message, or -1 if unset.
569 OSSL_CMP_CTX_get0_statusString() returns the statusString from the last received
570 CertRepMessage or Revocation Response or error message, or NULL if unset.
572 OSSL_CMP_CTX_get_failInfoCode() returns the error code from the failInfo field
573 of the last received CertRepMessage or Revocation Response or error message.
574 This is a bit field and the flags for it are specified in the header file
575 F<< <openssl/cmp.h> >>.
576 The flags start with OSSL_CMP_CTX_FAILINFO, for example:
577 OSSL_CMP_CTX_FAILINFO_badAlg. Returns -1 if the failInfoCode field is unset.
579 OSSL_CMP_CTX_get0_newCert() returns the pointer to the newly obtained
580 certificate in case it is available, else NULL.
582 OSSL_CMP_CTX_get1_caPubs() returns a pointer to a duplicate of the stack of
583 X.509 certificates received in the caPubs field of last received certificate
584 response message IP/CP/KUP.
586 OSSL_CMP_CTX_get1_extraCertsIn() returns a pointer to a duplicate of the stack
587 of X.509 certificates received in the last received nonempty extraCerts field.
588 Returns an empty stack if no extraCerts have been received in the current
591 OSSL_CMP_CTX_set1_transactionID() sets the given transaction ID in the given
592 OSSL_CMP_CTX structure.
594 OSSL_CMP_CTX_set1_senderNonce() stores the last sent sender B<nonce> in
595 the B<ctx>. This will be used to validate the recipNonce in incoming messages.
599 CMP is defined in RFC 4210 (and CRMF in RFC 4211).
603 OSSL_CMP_CTX_free() and OSSL_CMP_CTX_print_errors() do not return anything.
606 OSSL_CMP_CTX_get_http_cb_arg(),
607 OSSL_CMP_CTX_get_transfer_cb_arg(),
608 OSSL_CMP_CTX_get0_trustedStore(),
609 OSSL_CMP_CTX_get0_untrusted_certs(),
610 OSSL_CMP_CTX_get0_newPkey(),
611 OSSL_CMP_CTX_get_certConf_cb_arg(),
612 OSSL_CMP_CTX_get0_statusString(),
613 OSSL_CMP_CTX_get0_newCert(),
614 OSSL_CMP_CTX_get1_caPubs(), and
615 OSSL_CMP_CTX_get1_extraCertsIn()
616 return the intended pointer value as described above or NULL on error.
618 OSSL_CMP_CTX_get_option(),
619 OSSL_CMP_CTX_reqExtensions_have_SAN(),
620 OSSL_CMP_CTX_get_status(), and
621 OSSL_CMP_CTX_get_failInfoCode()
622 return the intended value as described above or -1 on error.
624 All other functions return 1 on success, 0 on error.
628 The following code omits error handling.
630 Set up a CMP client context for sending requests and verifying responses:
632 cmp_ctx = OSSL_CMP_CTX_new();
633 OSSL_CMP_CTX_set1_server(cmp_ctx, name_or_address);
634 OSSL_CMP_CTX_set1_serverPort(cmp_ctx, port_string);
635 OSSL_CMP_CTX_set1_serverPath(cmp_ctx, path_or_alias);
636 OSSL_CMP_CTX_set0_trustedStore(cmp_ctx, ts);
638 Set up client credentials for password-based protection (PBM):
640 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
641 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
643 Set up the details for certificate requests:
645 OSSL_CMP_CTX_set1_subjectName(cmp_ctx, name);
646 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, initialKey);
648 Perform an Initialization Request transaction:
650 initialCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
652 Reset the transaction state of the CMP context and the credentials:
654 OSSL_CMP_CTX_reinit(cmp_ctx);
655 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, NULL, 0);
656 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, NULL, 0);
658 Perform a Certification Request transaction, making use of the new credentials:
660 OSSL_CMP_CTX_set1_cert(cmp_ctx, initialCert);
661 OSSL_CMP_CTX_set1_pkey(cmp_ctx, initialKey);
662 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, curentKey);
663 currentCert = OSSL_CMP_exec_CR_ses(cmp_ctx);
665 Perform a Key Update Request, signed using the cert (and key) to be updated:
667 OSSL_CMP_CTX_reinit(cmp_ctx);
668 OSSL_CMP_CTX_set1_cert(cmp_ctx, currentCert);
669 OSSL_CMP_CTX_set1_pkey(cmp_ctx, currentKey);
670 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, updatedKey);
671 currentCert = OSSL_CMP_exec_KUR_ses(cmp_ctx);
672 currentKey = updatedKey;
674 Perform a General Message transaction including, as an example,
675 the id-it-signKeyPairTypes OID and prints info on the General Response contents:
677 OSSL_CMP_CTX_reinit(cmp_ctx);
679 ASN1_OBJECT *type = OBJ_txt2obj("1.3.6.1.5.5.7.4.2", 1);
680 OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_new(type, NULL);
681 OSSL_CMP_CTX_push0_genm_ITAV(cmp_ctx, itav);
683 STACK_OF(OSSL_CMP_ITAV) *itavs;
684 itavs = OSSL_CMP_exec_GENM_ses(cmp_ctx);
686 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
690 L<OSSL_CMP_exec_IR_ses(3)>, L<OSSL_CMP_exec_CR_ses(3)>,
691 L<OSSL_CMP_exec_KUR_ses(3)>, L<OSSL_CMP_exec_GENM_ses(3)>,
692 L<OSSL_CMP_exec_certreq(3)>
696 The OpenSSL CMP support was added in OpenSSL 3.0.
700 Copyright 2007-2020 The OpenSSL Project Authors. All Rights Reserved.
702 Licensed under the Apache License 2.0 (the "License"). You may not use
703 this file except in compliance with the License. You can obtain a copy
704 in the file LICENSE in the source distribution or at
705 L<https://www.openssl.org/source/license.html>.