doc/man3/OSSL_CMP_CTX_new.pod

   1 =pod
   2
   3 =head1 NAME
   4
   5 OSSL_CMP_CTX_new,
   6 OSSL_CMP_CTX_free,
   7 OSSL_CMP_CTX_reinit,
   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_serverName,
  15 OSSL_CMP_CTX_set_serverPort,
  16 OSSL_CMP_CTX_set1_proxyName,
  17 OSSL_CMP_CTX_set_proxyPort,
  18 OSSL_CMP_DEFAULT_PORT,
  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_trustedStore,
  29 OSSL_CMP_CTX_get0_trustedStore,
  30 OSSL_CMP_CTX_set1_untrusted_certs,
  31 OSSL_CMP_CTX_get0_untrusted_certs,
  32 OSSL_CMP_CTX_set1_clCert,
  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_set1_extraCertsOut,
  39 OSSL_CMP_CTX_set0_newPkey,
  40 OSSL_CMP_CTX_get0_newPkey,
  41 OSSL_CMP_CTX_set1_issuer,
  42 OSSL_CMP_CTX_set1_subjectName,
  43 OSSL_CMP_CTX_push1_subjectAltName,
  44 OSSL_CMP_CTX_set0_reqExtensions,
  45 OSSL_CMP_CTX_reqExtensions_have_SAN,
  46 OSSL_CMP_CTX_push0_policy,
  47 OSSL_CMP_CTX_set1_oldCert,
  48 OSSL_CMP_CTX_set1_p10CSR,
  49 OSSL_CMP_CTX_push0_genm_ITAV,
  50 OSSL_cmp_certConf_cb_t,
  51 OSSL_CMP_CTX_set_certConf_cb,
  52 OSSL_CMP_CTX_set_certConf_cb_arg,
  53 OSSL_CMP_CTX_get_certConf_cb_arg,
  54 OSSL_CMP_CTX_get_status,
  55 OSSL_CMP_CTX_get0_statusString,
  56 OSSL_CMP_CTX_get_failInfoCode,
  57 OSSL_CMP_CTX_get0_newCert,
  58 OSSL_CMP_CTX_get1_caPubs,
  59 OSSL_CMP_CTX_get1_extraCertsIn,
  60 OSSL_CMP_CTX_set1_transactionID,
  61 OSSL_CMP_CTX_set1_senderNonce
  62 - functions for managing the CMP client context data structure
  63
  64 =head1 SYNOPSIS
  65
  66  #include <openssl/cmp.h>
  67
  68  OSSL_CMP_CTX *OSSL_CMP_CTX_new(void);
  69  void OSSL_CMP_CTX_free(OSSL_CMP_CTX *ctx);
  70  int OSSL_CMP_CTX_reinit(OSSL_CMP_CTX *ctx);
  71  int OSSL_CMP_CTX_set_option(OSSL_CMP_CTX *ctx, int opt, int val);
  72  int OSSL_CMP_CTX_get_option(const OSSL_CMP_CTX *ctx, int opt);
  73
  74  /* logging and error reporting: */
  75  int OSSL_CMP_CTX_set_log_cb(OSSL_CMP_CTX *ctx, OSSL_cmp_log_cb_t cb);
  76  #define OSSL_CMP_CTX_set_log_verbosity(ctx, level)
  77  void OSSL_CMP_CTX_print_errors(OSSL_CMP_CTX *ctx);
  78
  79  /* message transfer: */
  80  int OSSL_CMP_CTX_set1_serverPath(OSSL_CMP_CTX *ctx, const char *path);
  81  int OSSL_CMP_CTX_set1_serverName(OSSL_CMP_CTX *ctx, const char *name);
  82  int OSSL_CMP_CTX_set_serverPort(OSSL_CMP_CTX *ctx, int port);
  83  int OSSL_CMP_CTX_set1_proxyName(OSSL_CMP_CTX *ctx, const char *name);
  84  int OSSL_CMP_CTX_set_proxyPort(OSSL_CMP_CTX *ctx, int port);
  85  #define OSSL_CMP_DEFAULT_PORT 80
  86  int OSSL_CMP_CTX_set_http_cb(OSSL_CMP_CTX *ctx, HTTP_bio_cb_t cb);
  87  int OSSL_CMP_CTX_set_http_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
  88  void *OSSL_CMP_CTX_get_http_cb_arg(const OSSL_CMP_CTX *ctx);
  89  typedef OSSL_CMP_MSG *(*OSSL_cmp_transfer_cb_t)(OSSL_CMP_CTX *ctx,
  90                                                  const OSSL_CMP_MSG *req);
  91  int OSSL_CMP_CTX_set_transfer_cb(OSSL_CMP_CTX *ctx,
  92                                   OSSL_cmp_transfer_cb_t cb);
  93  int OSSL_CMP_CTX_set_transfer_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
  94  void *OSSL_CMP_CTX_get_transfer_cb_arg(const OSSL_CMP_CTX *ctx);
  95
  96  /* server authentication: */
  97  int OSSL_CMP_CTX_set1_srvCert(OSSL_CMP_CTX *ctx, X509 *cert);
  98  int OSSL_CMP_CTX_set1_expected_sender(OSSL_CMP_CTX *ctx,
  99                                       const X509_NAME *name);
 100  int OSSL_CMP_CTX_set0_trustedStore(OSSL_CMP_CTX *ctx, X509_STORE *store);
 101  X509_STORE *OSSL_CMP_CTX_get0_trustedStore(const OSSL_CMP_CTX *ctx);
 102  int OSSL_CMP_CTX_set1_untrusted_certs(OSSL_CMP_CTX *ctx,
 103                                        STACK_OF(X509) *certs);
 104  STACK_OF(X509) *OSSL_CMP_CTX_get0_untrusted_certs(const OSSL_CMP_CTX *ctx);
 105
 106  /* client authentication: */
 107  int OSSL_CMP_CTX_set1_clCert(OSSL_CMP_CTX *ctx, X509 *cert);
 108  int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
 109  int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
 110                                       const unsigned char *ref, int len);
 111  int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx, const unsigned char *sec,
 112                                    const int len);
 113
 114  /* CMP message header and extra certificates: */
 115  int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
 116  int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
 117  int OSSL_CMP_CTX_set1_extraCertsOut(OSSL_CMP_CTX *ctx,
 118                                      STACK_OF(X509) *extraCertsOut);
 119
 120  /* certificate template: */
 121  int OSSL_CMP_CTX_set0_newPkey(OSSL_CMP_CTX *ctx, int priv, EVP_PKEY *pkey);
 122  EVP_PKEY *OSSL_CMP_CTX_get0_newPkey(const OSSL_CMP_CTX *ctx, int priv);
 123  int OSSL_CMP_CTX_set1_issuer(OSSL_CMP_CTX *ctx, const X509_NAME *name);
 124  int OSSL_CMP_CTX_set1_subjectName(OSSL_CMP_CTX *ctx, const X509_NAME *name);
 125  int OSSL_CMP_CTX_push1_subjectAltName(OSSL_CMP_CTX *ctx,
 126                                        const GENERAL_NAME *name);
 127  int OSSL_CMP_CTX_set0_reqExtensions(OSSL_CMP_CTX *ctx, X509_EXTENSIONS *exts);
 128  int OSSL_CMP_CTX_reqExtensions_have_SAN(OSSL_CMP_CTX *ctx);
 129  int OSSL_CMP_CTX_push0_policy(OSSL_CMP_CTX *ctx, POLICYINFO *pinfo);
 130  int OSSL_CMP_CTX_set1_oldCert(OSSL_CMP_CTX *ctx, X509 *cert);
 131  int OSSL_CMP_CTX_set1_p10CSR(OSSL_CMP_CTX *ctx, const X509_REQ *csr);
 132
 133  /* misc body contents: */
 134  int OSSL_CMP_CTX_push0_genm_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
 135
 136  /* certificate confirmation: */
 137  typedef int (*OSSL_cmp_certConf_cb_t)(OSSL_CMP_CTX *ctx, X509 *cert,
 138                                        int fail_info, const char **txt);
 139  int OSSL_CMP_CTX_set_certConf_cb(OSSL_CMP_CTX *ctx, OSSL_cmp_certConf_cb_t cb);
 140  int OSSL_CMP_CTX_set_certConf_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
 141  void *OSSL_CMP_CTX_get_certConf_cb_arg(const OSSL_CMP_CTX *ctx);
 142
 143  /* result fetching: */
 144  int OSSL_CMP_CTX_get_status(const OSSL_CMP_CTX *ctx);
 145  OSSL_CMP_PKIFREETEXT *OSSL_CMP_CTX_get0_statusString(const OSSL_CMP_CTX *ctx);
 146  int OSSL_CMP_CTX_get_failInfoCode(const OSSL_CMP_CTX *ctx);
 147
 148  X509 *OSSL_CMP_CTX_get0_newCert(const OSSL_CMP_CTX *ctx);
 149  STACK_OF(X509) *OSSL_CMP_CTX_get1_caPubs(const OSSL_CMP_CTX *ctx);
 150  STACK_OF(X509) *OSSL_CMP_CTX_get1_extraCertsIn(const OSSL_CMP_CTX *ctx);
 151
 152  /* for test purposes only: */
 153  int OSSL_CMP_CTX_set1_transactionID(OSSL_CMP_CTX *ctx,
 154                                      const ASN1_OCTET_STRING *id);
 155  int OSSL_CMP_CTX_set1_senderNonce(OSSL_CMP_CTX *ctx,
 156                                    const ASN1_OCTET_STRING *nonce);
 157
 158 =head1 DESCRIPTION
 159
 160 This is the context API for using CMP (Certificate Management Protocol) with
 161 OpenSSL.
 162
 163 OSSL_CMP_CTX_new() allocates and initializes an OSSL_CMP_CTX structure to
 164 default values, e.g., proof-of-possession method is set to POPOSigningKey.
 165
 166 OSSL_CMP_CTX_free() deallocates an OSSL_CMP_CTX structure.
 167
 168 OSSL_CMP_CTX_reinit() prepares the given B<ctx> for a further transaction by
 169 clearing the internal CMP transaction (aka session) status, PKIStatusInfo,
 170 and any previous results (newCert, caPubs, and extraCertsIn)
 171 from the last executed transaction.
 172 All other field values (i.e., CMP options) are retained for potential re-use.
 173
 174 OSSL_CMP_CTX_set_option() sets the given value for the given option
 175 (e.g., OSSL_CMP_OPT_IMPLICITCONFIRM) in the given OSSL_CMP_CTX structure.
 176
 177 The following options can be set:
 178
 179 =over 4
 180
 181 =item B<OSSL_CMP_OPT_LOG_VERBOSITY>
 182
 183         The level of severity needed for actually outputting log messages
 184         due to errors, warnings, general info, debugging, etc.
 185         Default is OSSL_CMP_LOG_INFO. See also L<OSSL_CMP_log_open(3)>.
 186
 187 =item B<OSSL_CMP_OPT_MSGTIMEOUT>
 188
 189         Number of seconds (or 0 for infinite) a CMP message round trip is
 190         allowed to take before a timeout error is returned. Default is 120.
 191
 192 =item B<OSSL_CMP_OPT_TOTALTIMEOUT>
 193
 194         Maximum total number of seconds an enrollment (including polling)
 195         may take. Default is 0 (infinite).
 196
 197 =item B<OSSL_CMP_OPT_VALIDITYDAYS>
 198
 199         Number of days new certificates are asked to be valid for.
 200
 201 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT>
 202
 203         Do not take default Subject Alternative Names
 204         from the reference certificate.
 205
 206 =item B<OSSL_CMP_OPT_SUBJECTALTNAME_CRITICAL>
 207
 208         Demand that the given Subject Alternative Names are flagged as critical.
 209
 210 =item B<OSSL_CMP_OPT_POLICIES_CRITICAL>
 211
 212         Demand that the given policies are flagged as critical.
 213
 214 =item B<OSSL_CMP_OPT_POPOMETHOD>
 215
 216         Select the proof of possession method to use. Possible values are:
 217
 218             OSSL_CRMF_POPO_NONE       - ProofOfPossession field omitted
 219             OSSL_CRMF_POPO_RAVERIFIED - assert that the RA has already
 220                                         verified the PoPo
 221             OSSL_CRMF_POPO_SIGNATURE  - sign a value with private key,
 222                                         which is the default.
 223             OSSL_CRMF_POPO_KEYENC     - decrypt the encrypted certificate
 224                                         ("indirect method")
 225
 226         Note that a signature-based POPO can only be produced if a private key
 227         is provided as the newPkey or client pkey component of the CMP context.
 228
 229 =item B<OSSL_CMP_OPT_DIGEST_ALGNID>
 230
 231         The digest algorithm NID to be used in RFC 4210's MSG_SIG_ALG,
 232         if applicable used for message protection and Proof-of-Possession.
 233         Default is SHA256.
 234
 235     OSSL_CMP_OPT_OWF_ALGNID
 236         The digest algorithm NID to be used as one-way function (OWF)
 237         in RFC 4210's MSG_MAC_ALG, if applicable used for message protection.
 238         Default is SHA256.
 239
 240     OSSL_CMP_OPT_MAC_ALGNID
 241         The MAC algorithm NID to be used in RFC 4210's MSG_MAC_ALG,
 242         if applicable used for message protection.
 243         Default is HMAC-SHA1 as per RFC 4210.
 244
 245 =item B<OSSL_CMP_OPT_REVOCATION_REASON>
 246
 247         The reason code to be included in a Revocation Request (RR);
 248         values: 0..10 (RFC 5210, 5.3.1) or -1 for none, which is the default.
 249
 250 =item B<OSSL_CMP_OPT_IMPLICITCONFIRM>
 251
 252         Request server to enable implicit confirm mode, where the client
 253         does not need to send confirmation upon receiving the
 254         certificate. If the server does not enable implicit confirmation
 255         in the return message, then confirmation is sent anyway.
 256
 257 =item B<OSSL_CMP_OPT_DISABLECONFIRM>
 258
 259         Do not confirm enrolled certificates, to cope with broken servers
 260         not supporting implicit confirmation correctly.
 261 B<WARNING:> This setting leads to unspecified behavior and it is meant
 262 exclusively to allow interoperability with server implementations violating
 263 RFC 4210.
 264
 265 =item B<OSSL_CMP_OPT_UNPROTECTED_SEND>
 266
 267         Send messages without CMP-level protection.
 268
 269 =item B<OSSL_CMP_OPT_UNPROTECTED_ERRORS>
 270
 271         Accept unprotected error responses which are either explicitly
 272         unprotected or where protection verification failed. Applies to regular
 273         error messages as well as certificate responses (IP/CP/KUP) and
 274         revocation responses (RP) with rejection.
 275 B<WARNING:> This setting leads to unspecified behavior and it is meant
 276 exclusively to allow interoperability with server implementations violating
 277 RFC 4210.
 278
 279 =item B<OSSL_CMP_OPT_IGNORE_KEYUSAGE>
 280
 281         Ignore key usage restrictions in signer certificate when
 282         validating signature-based protection in received CMP messages.
 283         Else, 'digitalSignature' must be allowed by CMP signer certificates.
 284
 285 =item B<OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR>
 286
 287         Allow retrieving a trust anchor from extraCerts and using that
 288         to validate the certificate chain of an IP message.
 289
 290 =back
 291
 292 OSSL_CMP_CTX_get_option() reads the current value of the given option
 293 (e.g., OSSL_CMP_OPT_IMPLICITCONFIRM) from the given OSSL_CMP_CTX structure.
 294
 295 OSSL_CMP_CTX_set_log_cb() sets in B<ctx> the callback function C<cb>
 296 for handling error queue entries and logging messages.
 297 When C<cb> is NULL errors are printed to STDERR (if available, else ignored)
 298 any log messages are ignored.
 299 Alternatively, L<OSSL_CMP_log_open(3)> may be used to direct logging to STDOUT.
 300
 301 OSSL_CMP_CTX_set_log_verbosity() is a macro setting the
 302 OSSL_CMP_OPT_LOG_VERBOSITY context option to the given level.
 303
 304 OSSL_CMP_CTX_print_errors() outputs any entries in the OpenSSL error queue.
 305 It is similar to B<ERR_print_errors_cb()> but uses the CMP log callback function
 306 if set in the C<ctx> for uniformity with CMP logging if given. Otherwise it uses
 307 B<ERR_print_errors(3)> to print to STDERR (unless OPENSSL_NO_STDIO is defined).
 308
 309 OSSL_CMP_CTX_set1_serverPath() sets the HTTP path of the CMP server on the host.
 310
 311 OSSL_CMP_CTX_set1_serverName() sets the given server Address (as IP or name)
 312 in the given OSSL_CMP_CTX structure.
 313
 314 OSSL_CMP_CTX_set_serverPort() sets the port of the CMP server to connect to.
 315 Port defaults to OSSL_CMP_DEFAULT_PORT = 80 if not set explicitly.
 316
 317 OSSL_CMP_CTX_set1_proxyName() sets the hostname of the HTTP proxy to be used
 318 for connecting to the CA server.
 319
 320 OSSL_CMP_CTX_set_proxyPort() sets the port of the HTTP proxy.
 321 Port defaults to OSSL_CMP_DEFAULT_PORT = 80 if not set explicitly.
 322
 323 OSSL_CMP_CTX_set_http_cb() sets the optional BIO connect/disconnect callback
 324 function, which has the prototype
 325
 326  typedef BIO *(*HTTP_bio_cb_t) (BIO *bio, void *ctx, int connect, int detail);
 327
 328 The callback may modify the BIO B<bio> provided by OSSL_CMP_MSG_http_perform(),
 329 whereby it may make use of a custom defined argument B<ctx>
 330 stored in the OSSL_CMP_CTX by means of OSSL_CMP_CTX_set_http_cb_arg().
 331 During connection establishment, just after calling BIO_connect_retry(),
 332 the function is invoked with the B<connect> argument being 1 and the B<detail>
 333 argument being 1 if HTTPS is requested, i.e., SSL/TLS should be enabled. On
 334 disconnect B<connect> is 0 and B<detail> is 1 in case no error occurred, else 0.
 335 For instance, on connect the function may prepend a TLS BIO to implement HTTPS;
 336 after disconnect it may do some diagnostic output and/or specific cleanup.
 337 The function should return NULL to indicate failure.
 338 After disconnect the modified BIO will be deallocated using BIO_free_all().
 339
 340 OSSL_CMP_CTX_set_http_cb_arg() sets an argument, respectively a pointer to
 341 a structure containing arguments,
 342 optionally to be used by the http connect/disconnect callback function.
 343 B<arg> is not consumed, and it must therefore explicitly be freed when not
 344 needed any more. B<arg> may be NULL to clear the entry.
 345
 346 OSSL_CMP_CTX_get_http_cb_arg() gets the argument, respectively the pointer to a
 347 structure containing arguments, previously set by
 348 OSSL_CMP_CTX_set_http_cb_arg() or NULL if unset.
 349
 350 OSSL_CMP_CTX_set_transfer_cb() sets the message transfer callback function,
 351 which has the type
 352
 353  typedef OSSL_CMP_MSG *(*OSSL_cmp_transfer_cb_t) (OSSL_CMP_CTX *ctx,
 354                                                   const OSSL_CMP_MSG *req);
 355
 356 Returns 1 on success, 0 on error.
 357
 358 Default is NULL, which implies the use of L<OSSL_CMP_MSG_http_perform(3)>.
 359 The callback should send the CMP request message it obtains via the B<req>
 360 parameter and on success return the response.
 361 The transfer callback may make use of a custom defined argument stored in
 362 the ctx by means of OSSL_CMP_CTX_set_transfer_cb_arg(), which may be retrieved
 363 again through OSSL_CMP_CTX_get_transfer_cb_arg().
 364
 365
 366 OSSL_CMP_CTX_set_transfer_cb_arg() sets an argument, respectively a pointer to a
 367 structure containing arguments, optionally to be used by the transfer callback.
 368 B<arg> is not consumed, and it must therefore explicitly be freed when not
 369 needed any more. B<arg> may be NULL to clear the entry.
 370
 371 OSSL_CMP_CTX_get_transfer_cb_arg() gets the argument, respectively the pointer
 372 to a structure containing arguments, previously set by
 373 OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
 374
 375 OSSL_CMP_CTX_set1_srvCert() pins the server certificate to be directly trusted
 376 (even if it is expired) for verifying response messages.
 377 The cert pointer is not consumed. It may be NULL to clear the entry.
 378
 379 OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN) expected to
 380 be given in the sender response for messages protected with MSG_SIG_ALG. This
 381 may be used to enforce that during validation of received messages the given DN
 382 matches the sender field of the PKIMessage header, which in turn is used to
 383 identify the server certificate.
 384 This can be used to ensure that only a particular entity is accepted to act as
 385 CMP server, and attackers are not able to use arbitrary certificates of a
 386 trusted PKI hierarchy to fraudulently pose as server.
 387 This defaults to the subject DN of the certificate set via
 388 OSSL_CMP_CTX_set1_srvCert(), if any.
 389
 390 OSSL_CMP_CTX_set0_trustedStore() sets the X509_STORE type certificate store
 391 containing trusted (root) CA certificates. The certificate store may also hold
 392 CRLs and a certificate verification callback function used for CMP server
 393 authentication. Any already existing store entry is freed. When given a NULL
 394 parameter the entry is cleared.
 395
 396 OSSL_CMP_CTX_get0_trustedStore() returns a pointer to the certificate store
 397 containing trusted root CA certificates, which may be empty if unset.
 398
 399 OSSL_CMP_CTX_set1_untrusted_certs() takes over a list of certificates containing
 400 non-trusted intermediate certs used for path construction in authentication
 401 of the CMP server and potentially others (TLS server, newly enrolled cert).
 402 The reference counts of those certificates handled successfully are increased.
 403
 404 OSSL_CMP_CTX_get0_untrusted_certs(OSSL_CMP_CTX *ctx) returns a pointer to the
 405 list of untrusted certs, which my be empty if unset.
 406
 407 OSSL_CMP_CTX_set1_clCert() sets the client certificate in the given
 408 OSSL_CMP_CTX structure. The client certificate will then be used by the
 409 functions to set the "sender" field for outgoing messages and it will be
 410 included in the extraCerts field.
 411
 412 OSSL_CMP_CTX_set1_pkey() sets the private key corresponding to the client
 413 certificate set with B<OSSL_CMP_CTX_set1_clCert()> in the given CMP context.
 414 Used to create the protection in case of MSG_SIG_ALG.
 415
 416 OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue in the given
 417 B<ctx> or clears it if the B<ref> argument is NULL.
 418
 419 OSSL_CMP_CTX_set1_secretValue() sets the B<sec> with the length B<len> in the
 420 given B<ctx> or clears it if the B<sec> argument is NULL.
 421
 422 OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
 423 PKIHeader of a request message, i.e. the X509 name of the (CA) server.
 424 Setting is overruled by subject of srvCert if set.
 425 If neither srvCert nor recipient are set, the recipient of the PKI message is
 426 determined in the following order: issuer, issuer of old cert (oldCert),
 427 issuer of client cert (clCert), else NULL-DN.
 428 When a response is received, its sender must match the recipient of the request.
 429
 430 OSSL_CMP_CTX_push0_geninfo_ITAV() adds B<itav> to the stack in the B<ctx> to be
 431 added to the GeneralInfo field of the CMP PKIMessage header of a request
 432 message sent with this context.  Consumes the pointer to B<itav>.
 433
 434 OSSL_CMP_CTX_set1_extraCertsOut() sets the stack of extraCerts that will be
 435 sent to remote.
 436
 437 OSSL_CMP_CTX_set0_newPkey() can be used to explicitly set the given EVP_PKEY
 438 structure as the private or public key to be certified in the CMP context.
 439 The B<priv> parameter must be 0 if and only if the given key is a public key.
 440
 441 OSSL_CMP_CTX_get0_newPkey() gives the key to use for certificate enrollment
 442 dependent on fields of the CMP context structure:
 443 the newPkey (which may be a private or public key) if present,
 444 else the public key in the p10CSR if present, else the client private key.
 445 If the B<priv> parameter is not 0 and the selected key does not have a
 446 private component then NULL is returned.
 447
 448 OSSL_CMP_CTX_set1_issuer() sets the name of the intended issuer that
 449 will be set in the CertTemplate, i.e., the X509 name of the CA server.
 450
 451 OSSL_CMP_CTX_set1_subjectName() sets the subject DN that will be used in
 452 the CertTemplate structure when requesting a new cert. For Key Update Requests
 453 (KUR), it defaults to the subject DN of the reference certificate,
 454 see B<OSSL_CMP_CTX_set1_oldCert()>. This default is used for Initialization
 455 Requests (IR) and Certification Requests (CR) only if no SANs are set.
 456
 457 If clCert is not set (e.g. in case of IR with MSG_MAC_ALG), the subject DN
 458 is also used as sender of the PKI message.
 459
 460 OSSL_CMP_CTX_push1_subjectAltName() adds the given X509 name to the list of
 461 alternate names on the certificate template request. This cannot be used if
 462 any Subject Alternative Name extension is set via
 463 OSSL_CMP_CTX_set0_reqExtensions().
 464 By default, unless OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT has been set,
 465 the Subject Alternative Names are copied from the reference certificate,
 466 see OSSL_CMP_CTX_set1_oldCert().
 467
 468 If set and the subject DN is not set with OSSL_CMP_CTX_set1_subjectName(), then
 469 the certificate template of an IR and CR will not be filled with the default
 470 subject DN from the reference certificate (see OSSL_CMP_CTX_set1_oldCert().
 471 If a subject DN is desired it needs to be set explicitly with
 472 OSSL_CMP_CTX_set1_subjectName().
 473
 474 OSSL_CMP_CTX_set0_reqExtensions() sets the X.509v3 extensions to be used in
 475 IR/CR/KUR.
 476
 477 OSSL_CMP_CTX_reqExtensions_have_SAN() returns 1 if the context contains
 478 a Subject Alternative Name extension, else 0 or -1 on error.
 479
 480 OSSL_CMP_CTX_push0_policy() adds the certificate policy info object
 481 to the X509_EXTENSIONS of the requested certificate template.
 482
 483 OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
 484 Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
 485 It must be given for RR, else it defaults to B<clCert>.
 486 The reference certificate determined in this way, if any, is also used for
 487 deriving default subject DN and Subject Alternative Names for IR, CR, and KUR.
 488 Its issuer, if any, is used as default recipient in the CMP message header.
 489
 490 OSSL_CMP_CTX_set1_p10CSR() sets the PKCS#10 CSR to be used in P10CR.
 491
 492 OSSL_CMP_CTX_push0_genm_ITAV() adds B<itav> to the stack in the B<ctx> which
 493 will be the body of a General Message sent with this context.
 494 Consumes the pointer to B<itav>.
 495
 496 OSSL_CMP_CTX_set_certConf_cb() sets the callback used for evaluating the newly
 497 enrolled certificate before the library sends, depending on its result,
 498 a positive or negative certConf message to the server. The callback has type
 499
 500  typedef int (*OSSL_cmp_certConf_cb_t) (OSSL_CMP_CTX *ctx, X509 *cert,
 501                                         int fail_info, const char **txt);
 502
 503 and should inspect the certificate it obtains via the B<cert> parameter and may
 504 overrule the pre-decision given in the B<fail_info> and B<*txt> parameters.
 505 If it accepts the certificate it must return 0, indicating success. Else it must
 506 return a bit field reflecting PKIFailureInfo with at least one failure bit and
 507 may set the B<*txt> output parameter to point to a string constant with more
 508 detail.  The transfer callback may make use of a custom defined argument stored
 509 in the B<ctx> by means of OSSL_CMP_CTX_set_certConf_cb_arg(), which may be
 510 retrieved again through OSSL_CMP_CTX_get_certConf_cb_arg().
 511 Typically, the callback will check at least that the certificate can be verified
 512 using a set of trusted certificates.
 513 It also could compare the subject DN and other fields of the newly
 514 enrolled certificate with the certificate template of the request.
 515
 516 OSSL_CMP_CTX_set_certConf_cb_arg() sets an argument, respectively a pointer to a
 517 structure containing arguments, optionally to be used by the certConf callback.
 518 B<arg> is not consumed, and it must therefore explicitly be freed when not
 519 needed any more. B<arg> may be NULL to clear the entry.
 520
 521 OSSL_CMP_CTX_get_certConf_cb_arg() gets the argument, respectively the pointer
 522 to a structure containing arguments, previously set by
 523 OSSL_CMP_CTX_set_certConf_cb_arg(), or NULL if unset.
 524
 525 OSSL_CMP_CTX_get_status() returns the PKIstatus from the last received
 526 CertRepMessage or Revocation Response or error message, or -1 if unset.
 527
 528 OSSL_CMP_CTX_get0_statusString() returns the statusString from the last received
 529 CertRepMessage or Revocation Response or error message, or NULL if unset.
 530
 531 OSSL_CMP_CTX_get_failInfoCode() returns the error code from the failInfo field
 532 of the last received CertRepMessage or Revocation Response or error message.
 533 This is a bit field and the flags for it are specified in the header file
 534 F<< <openssl/cmp.h> >>.
 535 The flags start with OSSL_CMP_CTX_FAILINFO, for example:
 536 OSSL_CMP_CTX_FAILINFO_badAlg. Returns -1 if the failInfoCode field is unset.
 537
 538 OSSL_CMP_CTX_get0_newCert() returns the pointer to the newly obtained
 539 certificate in case it is available, else NULL.
 540
 541 OSSL_CMP_CTX_get1_caPubs() returns a pointer to a duplicate of the stack of
 542 X.509 certificates received in the caPubs field of last received certificate
 543 response message IP/CP/KUP.
 544
 545 OSSL_CMP_CTX_get1_extraCertsIn() returns a pointer to a duplicate of the stack
 546 of X.509 certificates received in the last received non-empty extraCerts field.
 547 Returns an empty stack if no extraCerts have been received in the current
 548 transaction.
 549
 550 OSSL_CMP_CTX_set1_transactionID() sets the given transaction ID in the given
 551 OSSL_CMP_CTX structure.
 552
 553 OSSL_CMP_CTX_set1_senderNonce() stores the last sent sender B<nonce> in
 554 the B<ctx>. This will be used to validate the recipNonce in incoming messages.
 555
 556 =head1 NOTES
 557
 558 CMP is defined in RFC 4210 (and CRMF in RFC 4211).
 559
 560 =head1 RETURN VALUES
 561
 562 OSSL_CMP_CTX_free() and OSSL_CMP_CTX_print_errors() do not return anything.
 563
 564 OSSL_CMP_CTX_new(),
 565 OSSL_CMP_CTX_get_http_cb_arg(),
 566 OSSL_CMP_CTX_get_transfer_cb_arg(),
 567 OSSL_CMP_CTX_get0_trustedStore(),
 568 OSSL_CMP_CTX_get0_untrusted_certs(),
 569 OSSL_CMP_CTX_get0_newPkey(),
 570 OSSL_CMP_CTX_get_certConf_cb_arg(),
 571 OSSL_CMP_CTX_get0_statusString(),
 572 OSSL_CMP_CTX_get0_newCert(),
 573 OSSL_CMP_CTX_get1_caPubs(), and
 574 OSSL_CMP_CTX_get1_extraCertsIn()
 575 return the intended pointer value as described above or NULL on error.
 576
 577 OSSL_CMP_CTX_get_option(),
 578 OSSL_CMP_CTX_reqExtensions_have_SAN(),
 579 OSSL_CMP_CTX_get_status(), and
 580 OSSL_CMP_CTX_get_failInfoCode()
 581 return the intended value as described above or -1 on error.
 582
 583 All other functions return 1 on success, 0 on error.
 584
 585 =head1 EXAMPLES
 586
 587 The following code does an Initialization Request:
 588
 589         cmp_ctx = OSSL_CMP_CTX_new();
 590         OSSL_CMP_CTX_set1_serverName(cmp_ctx, opt_serverName);
 591         OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
 592         OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
 593         OSSL_CMP_CTX_set0_newPkey(cmp_ctx, new_pkey, 1);
 594         OSSL_CMP_CTX_set1_caCert(cmp_ctx, ca_cert);
 595
 596         initialClCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
 597
 598 The following code does an Initialization Request using an
 599 external identity certificate (RFC 4210, Appendix E.7):
 600
 601         cmp_ctx = OSSL_CMP_CTX_new();
 602         OSSL_CMP_CTX_set1_serverName(cmp_ctx, sname);
 603         OSSL_CMP_CTX_set1_clCert(cmp_ctx, cl_cert);
 604         OSSL_CMP_CTX_set1_pkey(cmp_ctx, pkey);
 605         OSSL_CMP_CTX_set0_newPkey(cmp_ctx, new_pkey, 1);
 606         OSSL_CMP_CTX_set1_caCert(cmp_ctx, ca_cert);
 607
 608         initialClCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
 609
 610 Here externalCert is an X509 certificate granted to the EE by another CA
 611 which is trusted by the current CA the code will connect to.
 612
 613
 614 The following code does a Key Update Request:
 615
 616         cmp_ctx = OSSL_CMP_CTX_new();
 617         OSSL_CMP_CTX_set1_serverName(cmp_ctx, sname);
 618         OSSL_CMP_CTX_set1_pkey(cmp_ctx, pkey);
 619         OSSL_CMP_CTX_set0_newPkey(cmp_ctx, new_pkey, 1);
 620         OSSL_CMP_CTX_set1_clCert(cmp_ctx, cl_cert);
 621         OSSL_CMP_CTX_set1_caCert(cmp_ctx, ca_cert);
 622
 623         updatedClCert = OSSL_CMP_exec_KUR_ses(cmp_ctx);
 624
 625 The following code (which omits error handling) sends a General Message
 626 including, as an example, the id-it-signKeyPairTypes OID and prints info on
 627 the General Response contents.
 628
 629     cmp_ctx = OSSL_CMP_CTX_new();
 630     OSSL_CMP_CTX_set1_serverName(cmp_ctx, sname);
 631     OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
 632     OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
 633
 634     ASN1_OBJECT *type = OBJ_txt2obj("1.3.6.1.5.5.7.4.2", 1);
 635     OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_new(type, NULL);
 636     OSSL_CMP_CTX_push0_genm_ITAV(cmp_ctx, itav);
 637
 638     STACK_OF(OSSL_CMP_ITAV) *itavs;
 639     itavs = OSSL_CMP_exec_GENM_ses(cmp_ctx);
 640     print_itavs(itavs);
 641     sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
 642
 643 =head1 SEE ALSO
 644
 645 L<OSSL_CMP_exec_IR_ses(3)>, L<OSSL_CMP_exec_KUR_ses(3)>,
 646 L<OSSL_CMP_exec_GENM_ses(3)>
 647
 648 =head1 HISTORY
 649
 650 The OpenSSL CMP support was added in OpenSSL 3.0.
 651
 652 =head1 COPYRIGHT
 653
 654 Copyright 2007-2019 The OpenSSL Project Authors. All Rights Reserved.
 655
 656 Licensed under the Apache License 2.0 (the "License").  You may not use
 657 this file except in compliance with the License.  You can obtain a copy
 658 in the file LICENSE in the source distribution or at
 659 L<https://www.openssl.org/source/license.html>.
 660
 661 =cut