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_get0_geninfo_ITAVs,
43 OSSL_CMP_CTX_set1_extraCertsOut,
44 OSSL_CMP_CTX_set0_newPkey,
45 OSSL_CMP_CTX_get0_newPkey,
46 OSSL_CMP_CTX_set1_issuer,
47 OSSL_CMP_CTX_set1_serialNumber,
48 OSSL_CMP_CTX_set1_subjectName,
49 OSSL_CMP_CTX_push1_subjectAltName,
50 OSSL_CMP_CTX_set0_reqExtensions,
51 OSSL_CMP_CTX_reqExtensions_have_SAN,
52 OSSL_CMP_CTX_push0_policy,
53 OSSL_CMP_CTX_set1_oldCert,
54 OSSL_CMP_CTX_set1_p10CSR,
55 OSSL_CMP_CTX_push0_genm_ITAV,
56 OSSL_CMP_certConf_cb_t,
58 OSSL_CMP_CTX_set_certConf_cb,
59 OSSL_CMP_CTX_set_certConf_cb_arg,
60 OSSL_CMP_CTX_get_certConf_cb_arg,
61 OSSL_CMP_CTX_get_status,
62 OSSL_CMP_CTX_get0_statusString,
63 OSSL_CMP_CTX_get_failInfoCode,
64 OSSL_CMP_CTX_get0_validatedSrvCert,
65 OSSL_CMP_CTX_get0_newCert,
66 OSSL_CMP_CTX_get1_newChain,
67 OSSL_CMP_CTX_get1_caPubs,
68 OSSL_CMP_CTX_get1_extraCertsIn,
69 OSSL_CMP_CTX_set1_transactionID,
70 OSSL_CMP_CTX_set1_senderNonce
71 - functions for managing the CMP client context data structure
75 #include <openssl/cmp.h>
77 OSSL_CMP_CTX *OSSL_CMP_CTX_new(OSSL_LIB_CTX *libctx, const char *propq);
78 void OSSL_CMP_CTX_free(OSSL_CMP_CTX *ctx);
79 int OSSL_CMP_CTX_reinit(OSSL_CMP_CTX *ctx);
80 OSSL_LIB_CTX *OSSL_CMP_CTX_get0_libctx(const OSSL_CMP_CTX *ctx);
81 const char *OSSL_CMP_CTX_get0_propq(const OSSL_CMP_CTX *ctx);
82 int OSSL_CMP_CTX_set_option(OSSL_CMP_CTX *ctx, int opt, int val);
83 int OSSL_CMP_CTX_get_option(const OSSL_CMP_CTX *ctx, int opt);
85 /* logging and error reporting: */
86 int OSSL_CMP_CTX_set_log_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_log_cb_t cb);
87 #define OSSL_CMP_CTX_set_log_verbosity(ctx, level)
88 void OSSL_CMP_CTX_print_errors(const OSSL_CMP_CTX *ctx);
90 /* message transfer: */
91 int OSSL_CMP_CTX_set1_serverPath(OSSL_CMP_CTX *ctx, const char *path);
92 int OSSL_CMP_CTX_set1_server(OSSL_CMP_CTX *ctx, const char *address);
93 int OSSL_CMP_CTX_set_serverPort(OSSL_CMP_CTX *ctx, int port);
94 int OSSL_CMP_CTX_set1_proxy(OSSL_CMP_CTX *ctx, const char *name);
95 int OSSL_CMP_CTX_set1_no_proxy(OSSL_CMP_CTX *ctx, const char *names);
96 int OSSL_CMP_CTX_set_http_cb(OSSL_CMP_CTX *ctx, HTTP_bio_cb_t cb);
97 int OSSL_CMP_CTX_set_http_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
98 void *OSSL_CMP_CTX_get_http_cb_arg(const OSSL_CMP_CTX *ctx);
99 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t)(OSSL_CMP_CTX *ctx,
100 const OSSL_CMP_MSG *req);
101 int OSSL_CMP_CTX_set_transfer_cb(OSSL_CMP_CTX *ctx,
102 OSSL_CMP_transfer_cb_t cb);
103 int OSSL_CMP_CTX_set_transfer_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
104 void *OSSL_CMP_CTX_get_transfer_cb_arg(const OSSL_CMP_CTX *ctx);
106 /* server authentication: */
107 int OSSL_CMP_CTX_set1_srvCert(OSSL_CMP_CTX *ctx, X509 *cert);
108 int OSSL_CMP_CTX_set1_expected_sender(OSSL_CMP_CTX *ctx,
109 const X509_NAME *name);
110 #define OSSL_CMP_CTX_set0_trusted OSSL_CMP_CTX_set0_trustedStore
111 int OSSL_CMP_CTX_set0_trustedStore(OSSL_CMP_CTX *ctx, X509_STORE *store);
112 #define OSSL_CMP_CTX_get0_trusted OSSL_CMP_CTX_get0_trustedStore
113 X509_STORE *OSSL_CMP_CTX_get0_trustedStore(const OSSL_CMP_CTX *ctx);
114 int OSSL_CMP_CTX_set1_untrusted(OSSL_CMP_CTX *ctx, STACK_OF(X509) *certs);
115 STACK_OF(X509) *OSSL_CMP_CTX_get0_untrusted(const OSSL_CMP_CTX *ctx);
117 /* client authentication: */
118 int OSSL_CMP_CTX_set1_cert(OSSL_CMP_CTX *ctx, X509 *cert);
119 int OSSL_CMP_CTX_build_cert_chain(OSSL_CMP_CTX *ctx, X509_STORE *own_trusted,
120 STACK_OF(X509) *candidates);
121 int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
122 int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
123 const unsigned char *ref, int len);
124 int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx,
125 const unsigned char *sec, int len);
127 /* CMP message header and extra certificates: */
128 int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
129 int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
130 int OSSL_CMP_CTX_reset_geninfo_ITAVs(OSSL_CMP_CTX *ctx);
131 STACK_OF(OSSL_CMP_ITAV)
132 *OSSL_CMP_CTX_get0_geninfo_ITAVs(const OSSL_CMP_CTX *ctx);
133 int OSSL_CMP_CTX_set1_extraCertsOut(OSSL_CMP_CTX *ctx,
134 STACK_OF(X509) *extraCertsOut);
136 /* certificate template: */
137 int OSSL_CMP_CTX_set0_newPkey(OSSL_CMP_CTX *ctx, int priv, EVP_PKEY *pkey);
138 EVP_PKEY *OSSL_CMP_CTX_get0_newPkey(const OSSL_CMP_CTX *ctx, int priv);
139 int OSSL_CMP_CTX_set1_issuer(OSSL_CMP_CTX *ctx, const X509_NAME *name);
140 int OSSL_CMP_CTX_set1_serialNumber(OSSL_CMP_CTX *ctx, const ASN1_INTEGER *sn);
141 int OSSL_CMP_CTX_set1_subjectName(OSSL_CMP_CTX *ctx, const X509_NAME *name);
142 int OSSL_CMP_CTX_push1_subjectAltName(OSSL_CMP_CTX *ctx,
143 const GENERAL_NAME *name);
144 int OSSL_CMP_CTX_set0_reqExtensions(OSSL_CMP_CTX *ctx, X509_EXTENSIONS *exts);
145 int OSSL_CMP_CTX_reqExtensions_have_SAN(OSSL_CMP_CTX *ctx);
146 int OSSL_CMP_CTX_push0_policy(OSSL_CMP_CTX *ctx, POLICYINFO *pinfo);
147 int OSSL_CMP_CTX_set1_oldCert(OSSL_CMP_CTX *ctx, X509 *cert);
148 int OSSL_CMP_CTX_set1_p10CSR(OSSL_CMP_CTX *ctx, const X509_REQ *csr);
150 /* misc body contents: */
151 int OSSL_CMP_CTX_push0_genm_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
153 /* certificate confirmation: */
154 typedef int (*OSSL_CMP_certConf_cb_t)(OSSL_CMP_CTX *ctx, X509 *cert,
155 int fail_info, const char **txt);
156 int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,
158 int OSSL_CMP_CTX_set_certConf_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_certConf_cb_t cb);
159 int OSSL_CMP_CTX_set_certConf_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
160 void *OSSL_CMP_CTX_get_certConf_cb_arg(const OSSL_CMP_CTX *ctx);
162 /* result fetching: */
163 int OSSL_CMP_CTX_get_status(const OSSL_CMP_CTX *ctx);
164 OSSL_CMP_PKIFREETEXT *OSSL_CMP_CTX_get0_statusString(const OSSL_CMP_CTX *ctx);
165 int OSSL_CMP_CTX_get_failInfoCode(const OSSL_CMP_CTX *ctx);
167 X509 *OSSL_CMP_CTX_get0_validatedSrvCert(const OSSL_CMP_CTX *ctx);
168 X509 *OSSL_CMP_CTX_get0_newCert(const OSSL_CMP_CTX *ctx);
169 STACK_OF(X509) *OSSL_CMP_CTX_get1_newChain(const OSSL_CMP_CTX *ctx);
170 STACK_OF(X509) *OSSL_CMP_CTX_get1_caPubs(const OSSL_CMP_CTX *ctx);
171 STACK_OF(X509) *OSSL_CMP_CTX_get1_extraCertsIn(const OSSL_CMP_CTX *ctx);
173 /* for testing and debugging purposes: */
174 int OSSL_CMP_CTX_set1_transactionID(OSSL_CMP_CTX *ctx,
175 const ASN1_OCTET_STRING *id);
176 int OSSL_CMP_CTX_set1_senderNonce(OSSL_CMP_CTX *ctx,
177 const ASN1_OCTET_STRING *nonce);
181 This is the context API for using CMP (Certificate Management Protocol) with
184 OSSL_CMP_CTX_new() allocates an B<OSSL_CMP_CTX> structure associated with
185 the library context I<libctx> and property query string I<propq>,
186 both of which may be NULL to select the defaults.
187 It initializes the remaining fields to their default values - for instance,
188 the logging verbosity is set to OSSL_CMP_LOG_INFO,
189 the message timeout is set to 120 seconds,
190 and the proof-of-possession method is set to OSSL_CRMF_POPO_SIGNATURE.
192 OSSL_CMP_CTX_free() deallocates an OSSL_CMP_CTX structure.
194 OSSL_CMP_CTX_reinit() prepares the given I<ctx> for a further transaction by
195 clearing the internal CMP transaction (aka session) status, PKIStatusInfo,
196 and any previous results (newCert, newChain, caPubs, and extraCertsIn)
197 from the last executed transaction.
198 It also clears any ITAVs that were added by OSSL_CMP_CTX_push0_genm_ITAV().
199 All other field values (i.e., CMP options) are retained for potential reuse.
201 OSSL_CMP_CTX_get0_libctx() returns the I<libctx> argument that was used
202 when constructing I<ctx> with OSSL_CMP_CTX_new(), which may be NULL.
204 OSSL_CMP_CTX_get0_propq() returns the I<propq> argument that was used
205 when constructing I<ctx> with OSSL_CMP_CTX_new(), which may be NULL.
207 OSSL_CMP_CTX_set_option() sets the given value for the given option
208 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) in the given OSSL_CMP_CTX structure.
210 The following options can be set:
214 =item B<OSSL_CMP_OPT_LOG_VERBOSITY>
216 The level of severity needed for actually outputting log messages
217 due to errors, warnings, general info, debugging, etc.
218 Default is OSSL_CMP_LOG_INFO. See also L<OSSL_CMP_log_open(3)>.
220 =item B<OSSL_CMP_OPT_KEEP_ALIVE>
222 If the given value is 0 then HTTP connections are not kept open
223 after receiving a response, which is the default behavior for HTTP 1.0.
224 If the value is 1 or 2 then persistent connections are requested.
225 If the value is 2 then persistent connections are required,
226 i.e., in case the server does not grant them an error occurs.
227 The default value is 1: prefer to keep the connection open.
229 =item B<OSSL_CMP_OPT_MSG_TIMEOUT>
231 Number of seconds a CMP request-response message round trip
232 is allowed to take before a timeout error is returned.
233 A value <= 0 means no limitation (waiting indefinitely).
234 Default is to use the B<OSSL_CMP_OPT_TOTAL_TIMEOUT> setting.
236 =item B<OSSL_CMP_OPT_TOTAL_TIMEOUT>
238 Maximum total number of seconds a transaction may take,
239 including polling etc.
240 A value <= 0 means no limitation (waiting indefinitely).
243 =item B<OSSL_CMP_OPT_USE_TLS>
245 Use this option to indicate to the HTTP implementation
246 whether TLS is going to be used for the connection (resulting in HTTPS).
247 The value 1 indicates that TLS is used for client-side HTTP connections,
248 which needs to be implemented via a callback function set by
249 OSSL_CMP_CTX_set_http_cb().
250 The value 0 indicates that TLS is not used.
251 Default is -1 for backward compatibility: TLS is used by the client side
252 if and only if OSSL_CMP_CTX_set_http_cb_arg() sets a non-NULL I<arg>.
254 =item B<OSSL_CMP_OPT_VALIDITY_DAYS>
256 Number of days new certificates are asked to be valid for.
258 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT>
260 Do not take default Subject Alternative Names
261 from the reference certificate.
263 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_CRITICAL>
265 Demand that the given Subject Alternative Names are flagged as critical.
267 =item B<OSSL_CMP_OPT_POLICIES_CRITICAL>
269 Demand that the given policies are flagged as critical.
271 =item B<OSSL_CMP_OPT_POPO_METHOD>
273 Select the proof of possession method to use. Possible values are:
275 OSSL_CRMF_POPO_NONE - ProofOfPossession field omitted
276 OSSL_CRMF_POPO_RAVERIFIED - assert that the RA has already
278 OSSL_CRMF_POPO_SIGNATURE - sign a value with private key,
279 which is the default.
280 OSSL_CRMF_POPO_KEYENC - decrypt the encrypted certificate
283 Note that a signature-based POPO can only be produced if a private key
284 is provided as the newPkey or client's pkey component of the CMP context.
286 =item B<OSSL_CMP_OPT_DIGEST_ALGNID>
288 The NID of the digest algorithm to be used in RFC 4210's MSG_SIG_ALG
289 for signature-based message protection and Proof-of-Possession (POPO).
292 =item B<OSSL_CMP_OPT_OWF_ALGNID>
293 The NID of the digest algorithm to be used as one-way function (OWF)
294 for MAC-based message protection with password-based MAC (PBM).
295 See RFC 4210 section 5.1.3.1 for details.
298 =item B<OSSL_CMP_OPT_MAC_ALGNID>
299 The NID of the MAC algorithm to be used for message protection with PBM.
300 Default is HMAC-SHA1 as per RFC 4210.
302 =item B<OSSL_CMP_OPT_REVOCATION_REASON>
304 The reason code to be included in a Revocation Request (RR);
305 values: 0..10 (RFC 5210, 5.3.1) or -1 for none, which is the default.
307 =item B<OSSL_CMP_OPT_IMPLICIT_CONFIRM>
309 Request server to enable implicit confirm mode, where the client
310 does not need to send confirmation upon receiving the
311 certificate. If the server does not enable implicit confirmation
312 in the return message, then confirmation is sent anyway.
314 =item B<OSSL_CMP_OPT_DISABLE_CONFIRM>
316 Do not confirm enrolled certificates, to cope with broken servers
317 not supporting implicit confirmation correctly.
318 B<WARNING:> This setting leads to unspecified behavior and it is meant
319 exclusively to allow interoperability with server implementations violating
322 =item B<OSSL_CMP_OPT_UNPROTECTED_SEND>
324 Send request or response messages without CMP-level protection.
326 =item B<OSSL_CMP_OPT_UNPROTECTED_ERRORS>
328 Accept unprotected error responses which are either explicitly
329 unprotected or where protection verification failed. Applies to regular
330 error messages as well as certificate responses (IP/CP/KUP) and
331 revocation responses (RP) with rejection.
332 B<WARNING:> This setting leads to unspecified behavior and it is meant
333 exclusively to allow interoperability with server implementations violating
336 =item B<OSSL_CMP_OPT_IGNORE_KEYUSAGE>
338 Ignore key usage restrictions in the signer's certificate when
339 validating signature-based protection in received CMP messages.
340 Else, 'digitalSignature' must be allowed by CMP signer certificates.
342 =item B<OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR>
344 Allow retrieving a trust anchor from extraCerts and using that
345 to validate the certificate chain of an IP message.
347 =item B<OSSL_CMP_OPT_NO_CACHE_EXTRACERTS>
349 Do not cache certificates received in the extraCerts CMP message field.
350 Otherwise they are stored to potentially help validate further messages.
354 OSSL_CMP_CTX_get_option() reads the current value of the given option
355 (e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) from the given OSSL_CMP_CTX structure.
357 OSSL_CMP_CTX_set_log_cb() sets in I<ctx> the callback function I<cb>
358 for handling error queue entries and logging messages.
359 When I<cb> is NULL errors are printed to STDERR (if available, else ignored)
360 any log messages are ignored.
361 Alternatively, L<OSSL_CMP_log_open(3)> may be used to direct logging to STDOUT.
363 OSSL_CMP_CTX_set_log_verbosity() is a macro setting the
364 OSSL_CMP_OPT_LOG_VERBOSITY context option to the given level.
366 OSSL_CMP_CTX_print_errors() outputs any entries in the OpenSSL error queue. It
367 is similar to L<ERR_print_errors_cb(3)> but uses the CMP log callback function
368 if set in the I<ctx> for uniformity with CMP logging if given. Otherwise it uses
369 L<ERR_print_errors(3)> to print to STDERR (unless OPENSSL_NO_STDIO is defined).
371 OSSL_CMP_CTX_set1_serverPath() sets the HTTP path of the CMP server on the host,
372 also known as "CMP alias".
375 OSSL_CMP_CTX_set1_server() sets the given server I<address>
376 (which may be a hostname or IP address or NULL) in the given I<ctx>.
378 OSSL_CMP_CTX_set_serverPort() sets the port of the CMP server to connect to.
379 If not used or the I<port> argument is 0
380 the default port applies, which is 80 for HTTP and 443 for HTTPS.
382 OSSL_CMP_CTX_set1_proxy() sets the HTTP proxy to be used for connecting to
383 the given CMP server unless overruled by any "no_proxy" settings (see below).
384 If TLS is not used this defaults to the value of
385 the environment variable C<http_proxy> if set, else C<HTTP_PROXY>.
386 Otherwise defaults to the value of C<https_proxy> if set, else C<HTTPS_PROXY>.
387 An empty proxy string specifies not to use a proxy.
388 Else the format is C<[http[s]://]address[:port][/path]>,
389 where any path given is ignored.
390 The default port number is 80, or 443 in case C<https:> is given.
392 OSSL_CMP_CTX_set1_no_proxy() sets the list of server hostnames not to use
393 an HTTP proxy for. The names may be separated by commas and/or whitespace.
394 Defaults to the environment variable C<no_proxy> if set, else C<NO_PROXY>.
396 OSSL_CMP_CTX_set_http_cb() sets the optional BIO connect/disconnect callback
397 function, which has the prototype
399 typedef BIO *(*HTTP_bio_cb_t) (BIO *bio, void *arg, int connect, int detail);
401 The callback may modify the I<bio> provided by L<OSSL_CMP_MSG_http_perform(3)>
402 as described for the I<bio_update_fn> parameter of L<OSSL_HTTP_open(3)>.
403 The callback may make use of a custom defined argument I<arg>,
404 as described for the I<arg> parameter of L<OSSL_HTTP_open(3)>.
405 The argument is stored in the OSSL_CMP_CTX using OSSL_CMP_CTX_set_http_cb_arg().
406 See also the B<OSSL_CMP_OPT_USE_TLS> option described above.
408 OSSL_CMP_CTX_set_http_cb_arg() sets the argument, respectively a pointer to
409 a structure containing arguments such as an B<SSL_CTX> structure,
410 optionally to be used by the http connect/disconnect callback function.
411 I<arg> is not consumed, and it must therefore explicitly be freed when not
412 needed any more. I<arg> may be NULL to clear the entry.
414 OSSL_CMP_CTX_get_http_cb_arg() gets the argument, respectively the pointer to a
415 structure containing arguments, previously set by
416 OSSL_CMP_CTX_set_http_cb_arg() or NULL if unset.
418 OSSL_CMP_CTX_set_transfer_cb() sets the message transfer callback function,
421 typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t) (OSSL_CMP_CTX *ctx,
422 const OSSL_CMP_MSG *req);
424 Default is NULL, which implies the use of L<OSSL_CMP_MSG_http_perform(3)>.
425 The callback should send the CMP request message it obtains via the I<req>
426 parameter and on success return the response, else it must return NULL.
427 The transfer callback may make use of a custom defined argument stored in
428 the ctx by means of OSSL_CMP_CTX_set_transfer_cb_arg(), which may be retrieved
429 again through OSSL_CMP_CTX_get_transfer_cb_arg().
431 OSSL_CMP_CTX_set_transfer_cb_arg() sets an argument, respectively a pointer to a
432 structure containing arguments, optionally to be used by the transfer callback.
433 I<arg> is not consumed, and it must therefore explicitly be freed when not
434 needed any more. I<arg> may be NULL to clear the entry.
436 OSSL_CMP_CTX_get_transfer_cb_arg() gets the argument, respectively the pointer
437 to a structure containing arguments, previously set by
438 OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
440 OSSL_CMP_CTX_set1_srvCert() sets the expected server cert in I<ctx> and trusts
441 it directly (even if it is expired) when verifying signed response messages.
442 This pins the accepted CMP server
443 and results in ignoring whatever may be set using OSSL_CMP_CTX_set0_trusted().
444 Any previously set value is freed.
445 The I<cert> argument may be NULL to clear the entry.
446 If set, the subject of the certificate is also used
447 as default value for the recipient of CMP requests
448 and as default value for the expected sender of CMP responses.
450 OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN)
451 expected in the sender field of incoming CMP messages.
452 Defaults to the subject of the pinned server certificate, if any.
453 This can be used to make sure that only a particular entity is accepted as
454 CMP message signer, and attackers are not able to use arbitrary certificates
455 of a trusted PKI hierarchy to fraudulently pose as CMP server.
456 Note that this gives slightly more freedom than OSSL_CMP_CTX_set1_srvCert(),
457 which pins the server to the holder of a particular certificate, while the
458 expected sender name will continue to match after updates of the server cert.
460 OSSL_CMP_CTX_set0_trusted() is an alias of the original
461 OSSL_CMP_CTX_set0_trustedStore().
462 It sets in the CMP context I<ctx> the certificate store of type X509_STORE
463 containing trusted certificates, typically of root CAs.
464 This is ignored when a certificate is pinned using OSSL_CMP_CTX_set1_srvCert().
465 The store may also hold CRLs and a certificate verification callback function
466 used for signature-based peer authentication.
467 Any store entry already set before is freed.
468 When given a NULL parameter the entry is cleared.
470 OSSL_CMP_CTX_get0_trusted() is an alias of the original
471 OSSL_CMP_CTX_get0_trustedStore().
472 It extracts from the CMP context I<ctx> the pointer to the currently set
473 certificate store containing trust anchors etc., or an empty store if unset.
475 OSSL_CMP_CTX_set1_untrusted() sets up a list of non-trusted certificates
476 of intermediate CAs that may be useful for path construction for the own CMP
477 signer certificate, for the own TLS certificate (if any), when verifying peer
478 CMP protection certificates, and when verifying newly enrolled certificates.
479 The reference counts of those certificates handled successfully are increased.
480 This list of untrusted certificates in I<ctx> will get augmented by extraCerts
481 in received CMP messages unless B<OSSL_CMP_OPT_NO_CACHE_EXTRACERTS> is set.
483 OSSL_CMP_CTX_get0_untrusted() returns a pointer to the
484 list of untrusted certs in I<ctx>, which may be empty if unset.
486 OSSL_CMP_CTX_set1_cert() sets the CMP I<signer certificate>,
487 also called I<protection certificate>,
488 related to the private key used for signature-based CMP message protection.
489 Therefore the public key of this I<cert> must correspond to
490 the private key set before or thereafter via OSSL_CMP_CTX_set1_pkey().
491 When using signature-based protection of CMP request messages
492 this CMP signer certificate will be included first in the extraCerts field.
493 It serves as fallback reference certificate, see OSSL_CMP_CTX_set1_oldCert().
494 The subject of this I<cert> will be used as the sender field of outgoing
495 messages, while the subject of any cert set via OSSL_CMP_CTX_set1_oldCert(),
496 the subject of any PKCS#10 CSR set via OSSL_CMP_CTX_set1_p10CSR(),
497 and any value set via OSSL_CMP_CTX_set1_subjectName() are used as fallback.
499 The I<cert> argument may be NULL to clear the entry.
501 OSSL_CMP_CTX_build_cert_chain() builds a certificate chain for the CMP signer
502 certificate previously set in the I<ctx>. It adds the optional I<candidates>,
503 a list of intermediate CA certs that may already constitute the targeted chain,
504 to the untrusted certs that may already exist in the I<ctx>.
505 Then the function uses this augmented set of certs for chain construction.
506 If I<own_trusted> is NULL it builds the chain as far down as possible and
507 ignores any verification errors. Else the CMP signer certificate must be
508 verifiable where the chain reaches a trust anchor contained in I<own_trusted>.
509 On success the function stores the resulting chain in I<ctx>
510 for inclusion in the extraCerts field of signature-protected messages.
511 Calling this function is optional; by default a chain construction
512 is performed on demand that is equivalent to calling this function
513 with the I<candidates> and I<own_trusted> arguments being NULL.
515 OSSL_CMP_CTX_set1_pkey() sets the client's private key corresponding to the
516 CMP signer certificate set via OSSL_CMP_CTX_set1_cert().
517 This key is used create signature-based protection (protectionAlg = MSG_SIG_ALG)
519 unless a symmetric secret has been set via OSSL_CMP_CTX_set1_secretValue().
520 The I<pkey> argument may be NULL to clear the entry.
522 OSSL_CMP_CTX_set1_secretValue() sets in I<ctx> the byte string I<sec> of length
523 I<len> to use as pre-shared secret, or clears it if the I<sec> argument is NULL.
524 If present, this secret is used to create MAC-based authentication and integrity
525 protection (rather than applying signature-based protection)
526 of outgoing messages and to verify authenticity and integrity of incoming
527 messages that have MAC-based protection (protectionAlg = C<MSG_MAC_ALG>).
529 OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue I<ref> with
530 length I<len> in the given I<ctx> or clears it if the I<ref> argument is NULL.
531 According to RFC 4210 section 5.1.1, if no value for the sender field in
532 CMP message headers can be determined (i.e., no CMP signer certificate
533 and no subject DN is set via OSSL_CMP_CTX_set1_subjectName()
534 then the sender field will contain the NULL-DN
535 and the senderKID field of the CMP message header must be set.
536 When signature-based protection is used the senderKID will be set to
537 the subjectKeyIdentifier of the CMP signer certificate as far as present.
538 If not present or when MAC-based protection is used
539 the I<ref> value is taken as the fallback value for the senderKID.
541 OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
542 PKIHeader of CMP request messages, i.e. the X509 name of the (CA) server.
544 The recipient field in the header of a CMP message is mandatory.
545 If not given explicitly the recipient is determined in the following order:
546 the subject of the CMP server certificate set using OSSL_CMP_CTX_set1_srvCert(),
547 the value set using OSSL_CMP_CTX_set1_issuer(),
548 the issuer of the certificate set using OSSL_CMP_CTX_set1_oldCert(),
549 the issuer of the CMP signer certificate,
550 as far as any of those is present, else the NULL-DN as last resort.
552 OSSL_CMP_CTX_push0_geninfo_ITAV() adds I<itav> to the stack in the I<ctx> to be
553 added to the generalInfo field of the CMP PKIMessage header of a request
554 message sent with this context.
556 OSSL_CMP_CTX_reset_geninfo_ITAVs()
557 clears any ITAVs that were added by OSSL_CMP_CTX_push0_geninfo_ITAV().
559 OSSL_CMP_CTX_get0_geninfo_ITAVs() returns the list of ITAVs set in I<ctx>
560 for inclusion in the generalInfo field of the CMP PKIMessage header of requests
563 OSSL_CMP_CTX_set1_extraCertsOut() sets the stack of extraCerts that will be
566 OSSL_CMP_CTX_set0_newPkey() can be used to explicitly set the given EVP_PKEY
567 structure as the private or public key to be certified in the CMP context.
568 The I<priv> parameter must be 0 if and only if the given key is a public key.
570 OSSL_CMP_CTX_get0_newPkey() gives the key to use for certificate enrollment
571 dependent on fields of the CMP context structure:
572 the newPkey (which may be a private or public key) if present,
573 else the public key in the p10CSR if present, else the client's private key.
574 If the I<priv> parameter is not 0 and the selected key does not have a
575 private component then NULL is returned.
577 OSSL_CMP_CTX_set1_issuer() sets the name of the intended issuer that
578 will be set in the CertTemplate, i.e., the X509 name of the CA server.
580 OSSL_CMP_CTX_set1_serialNumber() sets the serial number optionally used to
581 select the certificate to be revoked in Revocation Requests (RR).
583 OSSL_CMP_CTX_set1_subjectName() sets the subject DN that will be used in
584 the CertTemplate structure when requesting a new cert. For Key Update Requests
585 (KUR), it defaults to the subject DN of the reference certificate,
586 see OSSL_CMP_CTX_set1_oldCert(). This default is used for Initialization
587 Requests (IR) and Certification Requests (CR) only if no SANs are set.
588 The I<subjectName> is also used as fallback for the sender field
589 of outgoing CMP messages if no reference certificate is available.
591 OSSL_CMP_CTX_push1_subjectAltName() adds the given X509 name to the list of
592 alternate names on the certificate template request. This cannot be used if
593 any Subject Alternative Name extension is set via
594 OSSL_CMP_CTX_set0_reqExtensions().
595 By default, unless B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT> has been set,
596 the Subject Alternative Names are copied from the reference certificate,
597 see OSSL_CMP_CTX_set1_oldCert().
598 If set and the subject DN is not set with OSSL_CMP_CTX_set1_subjectName() then
599 the certificate template of an IR and CR will not be filled with the default
600 subject DN from the reference certificate.
601 If a subject DN is desired it needs to be set explicitly with
602 OSSL_CMP_CTX_set1_subjectName().
604 OSSL_CMP_CTX_set0_reqExtensions() sets the X.509v3 extensions to be used in
607 OSSL_CMP_CTX_reqExtensions_have_SAN() returns 1 if the context contains
608 a Subject Alternative Name extension, else 0 or -1 on error.
610 OSSL_CMP_CTX_push0_policy() adds the certificate policy info object
611 to the X509_EXTENSIONS of the requested certificate template.
613 OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
614 Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
615 For RR, this is ignored if an issuer name and a serial number are provided using
616 OSSL_CMP_CTX_set1_issuer() and OSSL_CMP_CTX_set1_serialNumber(), respectively.
617 For IR/CR/KUR this sets the I<reference certificate>,
618 which otherwise defaults to the CMP signer certificate.
619 The I<reference certificate> determined this way, if any, is used for providing
620 default public key, subject DN, Subject Alternative Names, and issuer DN entries
621 in the requested certificate template of IR/CR/KUR messages.
623 The subject of the reference certificate is used as the sender field value
624 in CMP message headers.
625 Its issuer is used as default recipient in CMP message headers.
627 OSSL_CMP_CTX_set1_p10CSR() sets the PKCS#10 CSR to use in P10CR messages.
628 If such a CSR is provided, its subject and public key fields are also
629 used as fallback values for the certificate template of IR/CR/KUR/RR messages,
630 and any extensions included are added to the template of IR/CR/KUR messages.
632 OSSL_CMP_CTX_push0_genm_ITAV() adds I<itav> to the stack in the I<ctx> which
633 will be the body of a General Message sent with this context.
635 OSSL_CMP_certConf_cb() is the default certificate confirmation callback function.
636 If the callback argument is not NULL it must point to a trust store.
637 In this case the function checks that the newly enrolled certificate can be
638 verified using this trust store and untrusted certificates from the I<ctx>,
639 which have been augmented by the list of extraCerts received.
640 During this verification, any certificate status checking is disabled.
641 If the callback argument is NULL the function tries building an approximate
642 chain as far as possible using the same untrusted certificates from the I<ctx>,
643 and if this fails it takes the received extraCerts as fallback.
644 The resulting cert chain can be retrieved using OSSL_CMP_CTX_get1_newChain().
646 OSSL_CMP_CTX_set_certConf_cb() sets the callback used for evaluating the newly
647 enrolled certificate before the library sends, depending on its result,
648 a positive or negative certConf message to the server. The callback has type
650 typedef int (*OSSL_CMP_certConf_cb_t) (OSSL_CMP_CTX *ctx, X509 *cert,
651 int fail_info, const char **txt);
653 and should inspect the certificate it obtains via the I<cert> parameter and may
654 overrule the pre-decision given in the I<fail_info> and I<*txt> parameters.
655 If it accepts the certificate it must return 0, indicating success. Else it must
656 return a bit field reflecting PKIFailureInfo with at least one failure bit and
657 may set the I<*txt> output parameter to point to a string constant with more
658 detail. The transfer callback may make use of a custom defined argument stored
659 in the I<ctx> by means of OSSL_CMP_CTX_set_certConf_cb_arg(), which may be
660 retrieved again through OSSL_CMP_CTX_get_certConf_cb_arg().
661 Typically, the callback will check at least that the certificate can be verified
662 using a set of trusted certificates.
663 It also could compare the subject DN and other fields of the newly
664 enrolled certificate with the certificate template of the request.
666 OSSL_CMP_CTX_set_certConf_cb_arg() sets an argument, respectively a pointer to a
667 structure containing arguments, optionally to be used by the certConf callback.
668 I<arg> is not consumed, and it must therefore explicitly be freed when not
669 needed any more. I<arg> may be NULL to clear the entry.
671 OSSL_CMP_CTX_get_certConf_cb_arg() gets the argument, respectively the pointer
672 to a structure containing arguments, previously set by
673 OSSL_CMP_CTX_set_certConf_cb_arg(), or NULL if unset.
675 OSSL_CMP_CTX_get_status() returns for client contexts the PKIstatus from
676 the last received CertRepMessage or Revocation Response or error message:
677 =item B<OSSL_CMP_PKISTATUS_accepted> on successful receipt of a GENP message:
681 =item B<OSSL_CMP_PKISTATUS_request>
683 if an IR/CR/KUR/RR/GENM request message could not be produced,
685 =item B<OSSL_CMP_PKISTATUS_trans>
687 on a transmission error or transaction error for this type of request, and
689 =item B<OSSL_CMP_PKISTATUS_unspecified>
691 if no such request was attempted or OSSL_CMP_CTX_reinit() has been called.
695 For server contexts it returns
696 B<OSSL_CMP_PKISTATUS_trans> if a transaction is open,
697 otherwise B<OSSL_CMP_PKISTATUS_unspecified>.
699 OSSL_CMP_CTX_get0_statusString() returns the statusString from the last received
700 CertRepMessage or Revocation Response or error message, or NULL if unset.
702 OSSL_CMP_CTX_get_failInfoCode() returns the error code from the failInfo field
703 of the last received CertRepMessage or Revocation Response or error message,
704 or -1 if no such response was received or OSSL_CMP_CTX_reinit() has been called.
705 This is a bit field and the flags for it are specified in the header file
706 F<< <openssl/cmp.h> >>.
707 The flags start with OSSL_CMP_CTX_FAILINFO, for example:
708 OSSL_CMP_CTX_FAILINFO_badAlg. Returns -1 if the failInfoCode field is unset.
710 OSSL_CMP_CTX_get0_validatedSrvCert() returns
711 the successfully validated certificate, if any, that the CMP server used
712 in the current transaction for signature-based response message protection,
713 or NULL if the server used MAC-based protection.
714 The value is relevant only at the end of a successful transaction.
715 It may be used to check the authorization of the server based on its cert.
717 OSSL_CMP_CTX_get0_newCert() returns the pointer to the newly obtained
718 certificate in case it is available, else NULL.
720 OSSL_CMP_CTX_get1_newChain() returns a pointer to a duplicate of the stack of
721 X.509 certificates computed by OSSL_CMP_certConf_cb() (if this function has
722 been called) on the last received certificate response message IP/CP/KUP.
724 OSSL_CMP_CTX_get1_caPubs() returns a pointer to a duplicate of the list of
725 X.509 certificates in the caPubs field of the last received certificate
726 response message (of type IP, CP, or KUP),
727 or an empty stack if no caPubs have been received in the current transaction.
729 OSSL_CMP_CTX_get1_extraCertsIn() returns a pointer to a duplicate of the list
730 of X.509 certificates contained in the extraCerts field of the last received
731 response message (except for pollRep and PKIConf), or
732 an empty stack if no extraCerts have been received in the current transaction.
734 OSSL_CMP_CTX_set1_transactionID() sets the given transaction ID in the given
735 OSSL_CMP_CTX structure.
737 OSSL_CMP_CTX_set1_senderNonce() stores the last sent sender I<nonce> in
738 the I<ctx>. This will be used to validate the recipNonce in incoming messages.
742 CMP is defined in RFC 4210 (and CRMF in RFC 4211).
746 OSSL_CMP_CTX_free() and OSSL_CMP_CTX_print_errors() do not return anything.
749 OSSL_CMP_CTX_get0_libctx(), OSSL_CMP_CTX_get0_propq(),
750 OSSL_CMP_CTX_get_http_cb_arg(),
751 OSSL_CMP_CTX_get_transfer_cb_arg(),
752 OSSL_CMP_CTX_get0_trusted(),
753 OSSL_CMP_CTX_get0_untrusted(),
754 OSSL_CMP_CTX_get0_geninfo_ITAVs(),
755 OSSL_CMP_CTX_get0_newPkey(),
756 OSSL_CMP_CTX_get_certConf_cb_arg(),
757 OSSL_CMP_CTX_get0_statusString(),
758 OSSL_CMP_CTX_get0_validatedSrvCert(),
759 OSSL_CMP_CTX_get0_newCert(),
760 OSSL_CMP_CTX_get0_newChain(),
761 OSSL_CMP_CTX_get1_caPubs(), and
762 OSSL_CMP_CTX_get1_extraCertsIn()
763 return the intended pointer value as described above or NULL on error.
765 OSSL_CMP_CTX_get_option(),
766 OSSL_CMP_CTX_reqExtensions_have_SAN(),
767 OSSL_CMP_CTX_get_status(), and
768 OSSL_CMP_CTX_get_failInfoCode()
769 return the intended value as described above or -1 on error.
771 OSSL_CMP_certConf_cb() returns I<fail_info> if it is not equal to 0,
772 else 0 on successful validation,
773 or else a bit field with the B<OSSL_CMP_PKIFAILUREINFO_incorrectData> bit set.
775 All other functions, including OSSL_CMP_CTX_reinit()
776 and OSSL_CMP_CTX_reset_geninfo_ITAVs(),
777 return 1 on success, 0 on error.
781 The following code omits error handling.
783 Set up a CMP client context for sending requests and verifying responses:
785 cmp_ctx = OSSL_CMP_CTX_new();
786 OSSL_CMP_CTX_set1_server(cmp_ctx, name_or_address);
787 OSSL_CMP_CTX_set1_serverPort(cmp_ctx, port_string);
788 OSSL_CMP_CTX_set1_serverPath(cmp_ctx, path_or_alias);
789 OSSL_CMP_CTX_set0_trusted(cmp_ctx, ts);
791 Set up symmetric credentials for MAC-based message protection such as PBM:
793 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
794 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
796 Set up the details for certificate requests:
798 OSSL_CMP_CTX_set1_subjectName(cmp_ctx, name);
799 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, initialKey);
801 Perform an Initialization Request transaction:
803 initialCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
805 Reset the transaction state of the CMP context and the credentials:
807 OSSL_CMP_CTX_reinit(cmp_ctx);
808 OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, NULL, 0);
809 OSSL_CMP_CTX_set1_secretValue(cmp_ctx, NULL, 0);
811 Perform a Certification Request transaction, making use of the new credentials:
813 OSSL_CMP_CTX_set1_cert(cmp_ctx, initialCert);
814 OSSL_CMP_CTX_set1_pkey(cmp_ctx, initialKey);
815 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, curentKey);
816 currentCert = OSSL_CMP_exec_CR_ses(cmp_ctx);
818 Perform a Key Update Request, signed using the cert (and key) to be updated:
820 OSSL_CMP_CTX_reinit(cmp_ctx);
821 OSSL_CMP_CTX_set1_cert(cmp_ctx, currentCert);
822 OSSL_CMP_CTX_set1_pkey(cmp_ctx, currentKey);
823 OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, updatedKey);
824 currentCert = OSSL_CMP_exec_KUR_ses(cmp_ctx);
825 currentKey = updatedKey;
827 Perform a General Message transaction including, as an example,
828 the id-it-signKeyPairTypes OID and prints info on the General Response contents:
830 OSSL_CMP_CTX_reinit(cmp_ctx);
832 ASN1_OBJECT *type = OBJ_txt2obj("1.3.6.1.5.5.7.4.2", 1);
833 OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_create(type, NULL);
834 OSSL_CMP_CTX_push0_genm_ITAV(cmp_ctx, itav);
836 STACK_OF(OSSL_CMP_ITAV) *itavs;
837 itavs = OSSL_CMP_exec_GENM_ses(cmp_ctx);
839 sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
843 L<OSSL_CMP_exec_IR_ses(3)>, L<OSSL_CMP_exec_CR_ses(3)>,
844 L<OSSL_CMP_exec_KUR_ses(3)>, L<OSSL_CMP_exec_GENM_ses(3)>,
845 L<OSSL_CMP_exec_certreq(3)>, L<OSSL_CMP_MSG_http_perform(3)>,
846 L<ERR_print_errors_cb(3)>, L<OSSL_HTTP_open(3)>
850 The OpenSSL CMP support was added in OpenSSL 3.0.
852 OSSL_CMP_CTX_get0_trustedStore() was renamed to OSSL_CMP_CTX_get0_trusted() and
853 OSSL_CMP_CTX_set0_trustedStore() was renamed to OSSL_CMP_CTX_set0_trusted(),
854 using macros, while keeping the old names for backward compatibility,
857 OSSL_CMP_CTX_reset_geninfo_ITAVs() was added in OpenSSL 3.0.8.
859 OSSL_CMP_CTX_set1_serialNumber(),
860 OSSL_CMP_CTX_get0_libctx(), OSSL_CMP_CTX_get0_propq(), and
861 OSSL_CMP_CTX_get0_validatedSrvCert() were added in OpenSSL 3.2.
863 OSSL_CMP_CTX_get0_geninfo_ITAVs() was added in OpenSSL 3.3.
867 Copyright 2007-2024 The OpenSSL Project Authors. All Rights Reserved.
869 Licensed under the Apache License 2.0 (the "License"). You may not use
870 this file except in compliance with the License. You can obtain a copy
871 in the file LICENSE in the source distribution or at
872 L<https://www.openssl.org/source/license.html>.