859 lines
38 KiB
Plaintext
859 lines
38 KiB
Plaintext
=pod
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=head1 NAME
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OSSL_CMP_CTX_new,
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OSSL_CMP_CTX_free,
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OSSL_CMP_CTX_reinit,
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OSSL_CMP_CTX_get0_libctx, OSSL_CMP_CTX_get0_propq,
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OSSL_CMP_CTX_set_option,
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OSSL_CMP_CTX_get_option,
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OSSL_CMP_CTX_set_log_cb,
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OSSL_CMP_CTX_set_log_verbosity,
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OSSL_CMP_CTX_print_errors,
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OSSL_CMP_CTX_set1_serverPath,
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OSSL_CMP_CTX_set1_server,
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OSSL_CMP_CTX_set_serverPort,
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OSSL_CMP_CTX_set1_proxy,
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OSSL_CMP_CTX_set1_no_proxy,
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OSSL_CMP_CTX_set_http_cb,
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OSSL_CMP_CTX_set_http_cb_arg,
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OSSL_CMP_CTX_get_http_cb_arg,
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OSSL_CMP_transfer_cb_t,
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OSSL_CMP_CTX_set_transfer_cb,
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OSSL_CMP_CTX_set_transfer_cb_arg,
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OSSL_CMP_CTX_get_transfer_cb_arg,
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OSSL_CMP_CTX_set1_srvCert,
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OSSL_CMP_CTX_set1_expected_sender,
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OSSL_CMP_CTX_set0_trusted,
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OSSL_CMP_CTX_set0_trustedStore,
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OSSL_CMP_CTX_get0_trusted,
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OSSL_CMP_CTX_get0_trustedStore,
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OSSL_CMP_CTX_set1_untrusted,
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OSSL_CMP_CTX_get0_untrusted,
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OSSL_CMP_CTX_set1_cert,
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OSSL_CMP_CTX_build_cert_chain,
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OSSL_CMP_CTX_set1_pkey,
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OSSL_CMP_CTX_set1_referenceValue,
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OSSL_CMP_CTX_set1_secretValue,
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OSSL_CMP_CTX_set1_recipient,
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OSSL_CMP_CTX_push0_geninfo_ITAV,
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OSSL_CMP_CTX_reset_geninfo_ITAVs,
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OSSL_CMP_CTX_set1_extraCertsOut,
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OSSL_CMP_CTX_set0_newPkey,
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OSSL_CMP_CTX_get0_newPkey,
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OSSL_CMP_CTX_set1_issuer,
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OSSL_CMP_CTX_set1_serialNumber,
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OSSL_CMP_CTX_set1_subjectName,
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OSSL_CMP_CTX_push1_subjectAltName,
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OSSL_CMP_CTX_set0_reqExtensions,
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OSSL_CMP_CTX_reqExtensions_have_SAN,
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OSSL_CMP_CTX_push0_policy,
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OSSL_CMP_CTX_set1_oldCert,
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OSSL_CMP_CTX_set1_p10CSR,
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OSSL_CMP_CTX_push0_genm_ITAV,
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OSSL_CMP_certConf_cb_t,
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OSSL_CMP_certConf_cb,
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OSSL_CMP_CTX_set_certConf_cb,
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OSSL_CMP_CTX_set_certConf_cb_arg,
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OSSL_CMP_CTX_get_certConf_cb_arg,
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OSSL_CMP_CTX_get_status,
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OSSL_CMP_CTX_get0_statusString,
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OSSL_CMP_CTX_get_failInfoCode,
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OSSL_CMP_CTX_get0_validatedSrvCert,
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OSSL_CMP_CTX_get0_newCert,
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OSSL_CMP_CTX_get1_newChain,
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OSSL_CMP_CTX_get1_caPubs,
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OSSL_CMP_CTX_get1_extraCertsIn,
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OSSL_CMP_CTX_set1_transactionID,
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OSSL_CMP_CTX_set1_senderNonce
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- functions for managing the CMP client context data structure
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=head1 SYNOPSIS
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#include <openssl/cmp.h>
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OSSL_CMP_CTX *OSSL_CMP_CTX_new(OSSL_LIB_CTX *libctx, const char *propq);
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void OSSL_CMP_CTX_free(OSSL_CMP_CTX *ctx);
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int OSSL_CMP_CTX_reinit(OSSL_CMP_CTX *ctx);
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OSSL_LIB_CTX *OSSL_CMP_CTX_get0_libctx(const OSSL_CMP_CTX *ctx);
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const char *OSSL_CMP_CTX_get0_propq(const OSSL_CMP_CTX *ctx);
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int OSSL_CMP_CTX_set_option(OSSL_CMP_CTX *ctx, int opt, int val);
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int OSSL_CMP_CTX_get_option(const OSSL_CMP_CTX *ctx, int opt);
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/* logging and error reporting: */
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int OSSL_CMP_CTX_set_log_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_log_cb_t cb);
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#define OSSL_CMP_CTX_set_log_verbosity(ctx, level)
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void OSSL_CMP_CTX_print_errors(const OSSL_CMP_CTX *ctx);
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/* message transfer: */
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int OSSL_CMP_CTX_set1_serverPath(OSSL_CMP_CTX *ctx, const char *path);
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int OSSL_CMP_CTX_set1_server(OSSL_CMP_CTX *ctx, const char *address);
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int OSSL_CMP_CTX_set_serverPort(OSSL_CMP_CTX *ctx, int port);
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int OSSL_CMP_CTX_set1_proxy(OSSL_CMP_CTX *ctx, const char *name);
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int OSSL_CMP_CTX_set1_no_proxy(OSSL_CMP_CTX *ctx, const char *names);
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int OSSL_CMP_CTX_set_http_cb(OSSL_CMP_CTX *ctx, HTTP_bio_cb_t cb);
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int OSSL_CMP_CTX_set_http_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
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void *OSSL_CMP_CTX_get_http_cb_arg(const OSSL_CMP_CTX *ctx);
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typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t)(OSSL_CMP_CTX *ctx,
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const OSSL_CMP_MSG *req);
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int OSSL_CMP_CTX_set_transfer_cb(OSSL_CMP_CTX *ctx,
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OSSL_CMP_transfer_cb_t cb);
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int OSSL_CMP_CTX_set_transfer_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
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void *OSSL_CMP_CTX_get_transfer_cb_arg(const OSSL_CMP_CTX *ctx);
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/* server authentication: */
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int OSSL_CMP_CTX_set1_srvCert(OSSL_CMP_CTX *ctx, X509 *cert);
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int OSSL_CMP_CTX_set1_expected_sender(OSSL_CMP_CTX *ctx,
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const X509_NAME *name);
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#define OSSL_CMP_CTX_set0_trusted OSSL_CMP_CTX_set0_trustedStore
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int OSSL_CMP_CTX_set0_trustedStore(OSSL_CMP_CTX *ctx, X509_STORE *store);
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#define OSSL_CMP_CTX_get0_trusted OSSL_CMP_CTX_get0_trustedStore
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X509_STORE *OSSL_CMP_CTX_get0_trustedStore(const OSSL_CMP_CTX *ctx);
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int OSSL_CMP_CTX_set1_untrusted(OSSL_CMP_CTX *ctx, STACK_OF(X509) *certs);
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STACK_OF(X509) *OSSL_CMP_CTX_get0_untrusted(const OSSL_CMP_CTX *ctx);
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/* client authentication: */
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int OSSL_CMP_CTX_set1_cert(OSSL_CMP_CTX *ctx, X509 *cert);
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int OSSL_CMP_CTX_build_cert_chain(OSSL_CMP_CTX *ctx, X509_STORE *own_trusted,
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STACK_OF(X509) *candidates);
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int OSSL_CMP_CTX_set1_pkey(OSSL_CMP_CTX *ctx, EVP_PKEY *pkey);
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int OSSL_CMP_CTX_set1_referenceValue(OSSL_CMP_CTX *ctx,
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const unsigned char *ref, int len);
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int OSSL_CMP_CTX_set1_secretValue(OSSL_CMP_CTX *ctx,
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const unsigned char *sec, int len);
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/* CMP message header and extra certificates: */
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int OSSL_CMP_CTX_set1_recipient(OSSL_CMP_CTX *ctx, const X509_NAME *name);
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int OSSL_CMP_CTX_push0_geninfo_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
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int OSSL_CMP_CTX_reset_geninfo_ITAVs(OSSL_CMP_CTX *ctx);
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int OSSL_CMP_CTX_set1_extraCertsOut(OSSL_CMP_CTX *ctx,
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STACK_OF(X509) *extraCertsOut);
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/* certificate template: */
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int OSSL_CMP_CTX_set0_newPkey(OSSL_CMP_CTX *ctx, int priv, EVP_PKEY *pkey);
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EVP_PKEY *OSSL_CMP_CTX_get0_newPkey(const OSSL_CMP_CTX *ctx, int priv);
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int OSSL_CMP_CTX_set1_issuer(OSSL_CMP_CTX *ctx, const X509_NAME *name);
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int OSSL_CMP_CTX_set1_serialNumber(OSSL_CMP_CTX *ctx, const ASN1_INTEGER *sn);
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int OSSL_CMP_CTX_set1_subjectName(OSSL_CMP_CTX *ctx, const X509_NAME *name);
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int OSSL_CMP_CTX_push1_subjectAltName(OSSL_CMP_CTX *ctx,
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const GENERAL_NAME *name);
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int OSSL_CMP_CTX_set0_reqExtensions(OSSL_CMP_CTX *ctx, X509_EXTENSIONS *exts);
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int OSSL_CMP_CTX_reqExtensions_have_SAN(OSSL_CMP_CTX *ctx);
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int OSSL_CMP_CTX_push0_policy(OSSL_CMP_CTX *ctx, POLICYINFO *pinfo);
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int OSSL_CMP_CTX_set1_oldCert(OSSL_CMP_CTX *ctx, X509 *cert);
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int OSSL_CMP_CTX_set1_p10CSR(OSSL_CMP_CTX *ctx, const X509_REQ *csr);
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/* misc body contents: */
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int OSSL_CMP_CTX_push0_genm_ITAV(OSSL_CMP_CTX *ctx, OSSL_CMP_ITAV *itav);
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/* certificate confirmation: */
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typedef int (*OSSL_CMP_certConf_cb_t)(OSSL_CMP_CTX *ctx, X509 *cert,
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int fail_info, const char **txt);
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int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,
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const char **text);
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int OSSL_CMP_CTX_set_certConf_cb(OSSL_CMP_CTX *ctx, OSSL_CMP_certConf_cb_t cb);
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int OSSL_CMP_CTX_set_certConf_cb_arg(OSSL_CMP_CTX *ctx, void *arg);
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void *OSSL_CMP_CTX_get_certConf_cb_arg(const OSSL_CMP_CTX *ctx);
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/* result fetching: */
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int OSSL_CMP_CTX_get_status(const OSSL_CMP_CTX *ctx);
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OSSL_CMP_PKIFREETEXT *OSSL_CMP_CTX_get0_statusString(const OSSL_CMP_CTX *ctx);
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int OSSL_CMP_CTX_get_failInfoCode(const OSSL_CMP_CTX *ctx);
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X509 *OSSL_CMP_CTX_get0_validatedSrvCert(const OSSL_CMP_CTX *ctx);
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X509 *OSSL_CMP_CTX_get0_newCert(const OSSL_CMP_CTX *ctx);
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STACK_OF(X509) *OSSL_CMP_CTX_get1_newChain(const OSSL_CMP_CTX *ctx);
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STACK_OF(X509) *OSSL_CMP_CTX_get1_caPubs(const OSSL_CMP_CTX *ctx);
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STACK_OF(X509) *OSSL_CMP_CTX_get1_extraCertsIn(const OSSL_CMP_CTX *ctx);
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/* for testing and debugging purposes: */
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int OSSL_CMP_CTX_set1_transactionID(OSSL_CMP_CTX *ctx,
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const ASN1_OCTET_STRING *id);
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int OSSL_CMP_CTX_set1_senderNonce(OSSL_CMP_CTX *ctx,
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const ASN1_OCTET_STRING *nonce);
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=head1 DESCRIPTION
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This is the context API for using CMP (Certificate Management Protocol) with
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OpenSSL.
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OSSL_CMP_CTX_new() allocates an B<OSSL_CMP_CTX> structure associated with
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the library context I<libctx> and property query string I<propq>,
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both of which may be NULL to select the defaults.
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It initializes the remaining fields to their default values - for instance,
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the logging verbosity is set to OSSL_CMP_LOG_INFO,
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the message timeout is set to 120 seconds,
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and the proof-of-possession method is set to OSSL_CRMF_POPO_SIGNATURE.
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OSSL_CMP_CTX_free() deallocates an OSSL_CMP_CTX structure.
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OSSL_CMP_CTX_reinit() prepares the given I<ctx> for a further transaction by
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clearing the internal CMP transaction (aka session) status, PKIStatusInfo,
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and any previous results (newCert, newChain, caPubs, and extraCertsIn)
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from the last executed transaction.
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It also clears any ITAVs that were added by OSSL_CMP_CTX_push0_genm_ITAV().
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All other field values (i.e., CMP options) are retained for potential reuse.
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OSSL_CMP_CTX_get0_libctx() returns the I<libctx> argument that was used
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when constructing I<ctx> with OSSL_CMP_CTX_new(), which may be NULL.
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OSSL_CMP_CTX_get0_propq() returns the I<propq> argument that was used
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when constructing I<ctx> with OSSL_CMP_CTX_new(), which may be NULL.
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OSSL_CMP_CTX_set_option() sets the given value for the given option
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(e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) in the given OSSL_CMP_CTX structure.
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The following options can be set:
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=over 4
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=item B<OSSL_CMP_OPT_LOG_VERBOSITY>
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The level of severity needed for actually outputting log messages
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due to errors, warnings, general info, debugging, etc.
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Default is OSSL_CMP_LOG_INFO. See also L<OSSL_CMP_log_open(3)>.
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=item B<OSSL_CMP_OPT_KEEP_ALIVE>
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If the given value is 0 then HTTP connections are not kept open
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after receiving a response, which is the default behavior for HTTP 1.0.
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If the value is 1 or 2 then persistent connections are requested.
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If the value is 2 then persistent connections are required,
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i.e., in case the server does not grant them an error occurs.
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The default value is 1: prefer to keep the connection open.
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=item B<OSSL_CMP_OPT_MSG_TIMEOUT>
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Number of seconds a CMP request-response message round trip
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is allowed to take before a timeout error is returned.
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A value <= 0 means no limitation (waiting indefinitely).
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Default is to use the B<OSSL_CMP_OPT_TOTAL_TIMEOUT> setting.
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=item B<OSSL_CMP_OPT_TOTAL_TIMEOUT>
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Maximum total number of seconds a transaction may take,
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including polling etc.
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A value <= 0 means no limitation (waiting indefinitely).
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Default is 0.
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=item B<OSSL_CMP_OPT_USE_TLS>
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Use this option to indicate to the HTTP implementation
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whether TLS is going to be used for the connection (resulting in HTTPS).
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The value 1 indicates that TLS is used for client-side HTTP connections,
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which needs to be implemented via a callback function set by
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OSSL_CMP_CTX_set_http_cb().
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The value 0 indicates that TLS is not used.
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Default is -1 for backward compatibility: TLS is used by the client side
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if and only if OSSL_CMP_CTX_set_http_cb_arg() sets a non-NULL I<arg>.
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=item B<OSSL_CMP_OPT_VALIDITY_DAYS>
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Number of days new certificates are asked to be valid for.
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=item B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT>
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Do not take default Subject Alternative Names
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from the reference certificate.
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=item B<OSSL_CMP_OPT_SUBJECTALTNAME_CRITICAL>
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Demand that the given Subject Alternative Names are flagged as critical.
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=item B<OSSL_CMP_OPT_POLICIES_CRITICAL>
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Demand that the given policies are flagged as critical.
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=item B<OSSL_CMP_OPT_POPO_METHOD>
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Select the proof of possession method to use. Possible values are:
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OSSL_CRMF_POPO_NONE - ProofOfPossession field omitted
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OSSL_CRMF_POPO_RAVERIFIED - assert that the RA has already
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verified the PoPo
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OSSL_CRMF_POPO_SIGNATURE - sign a value with private key,
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which is the default.
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OSSL_CRMF_POPO_KEYENC - decrypt the encrypted certificate
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("indirect method")
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Note that a signature-based POPO can only be produced if a private key
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is provided as the newPkey or client's pkey component of the CMP context.
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=item B<OSSL_CMP_OPT_DIGEST_ALGNID>
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The NID of the digest algorithm to be used in RFC 4210's MSG_SIG_ALG
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for signature-based message protection and Proof-of-Possession (POPO).
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Default is SHA256.
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=item B<OSSL_CMP_OPT_OWF_ALGNID>
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The NID of the digest algorithm to be used as one-way function (OWF)
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for MAC-based message protection with password-based MAC (PBM).
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See RFC 4210 section 5.1.3.1 for details.
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Default is SHA256.
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=item B<OSSL_CMP_OPT_MAC_ALGNID>
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The NID of the MAC algorithm to be used for message protection with PBM.
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Default is HMAC-SHA1 as per RFC 4210.
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=item B<OSSL_CMP_OPT_REVOCATION_REASON>
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The reason code to be included in a Revocation Request (RR);
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values: 0..10 (RFC 5210, 5.3.1) or -1 for none, which is the default.
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=item B<OSSL_CMP_OPT_IMPLICIT_CONFIRM>
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Request server to enable implicit confirm mode, where the client
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does not need to send confirmation upon receiving the
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certificate. If the server does not enable implicit confirmation
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in the return message, then confirmation is sent anyway.
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=item B<OSSL_CMP_OPT_DISABLE_CONFIRM>
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Do not confirm enrolled certificates, to cope with broken servers
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not supporting implicit confirmation correctly.
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B<WARNING:> This setting leads to unspecified behavior and it is meant
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exclusively to allow interoperability with server implementations violating
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RFC 4210.
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=item B<OSSL_CMP_OPT_UNPROTECTED_SEND>
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Send request or response messages without CMP-level protection.
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=item B<OSSL_CMP_OPT_UNPROTECTED_ERRORS>
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Accept unprotected error responses which are either explicitly
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unprotected or where protection verification failed. Applies to regular
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error messages as well as certificate responses (IP/CP/KUP) and
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revocation responses (RP) with rejection.
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B<WARNING:> This setting leads to unspecified behavior and it is meant
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exclusively to allow interoperability with server implementations violating
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RFC 4210.
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=item B<OSSL_CMP_OPT_IGNORE_KEYUSAGE>
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Ignore key usage restrictions in the signer's certificate when
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validating signature-based protection in received CMP messages.
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Else, 'digitalSignature' must be allowed by CMP signer certificates.
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=item B<OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR>
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Allow retrieving a trust anchor from extraCerts and using that
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to validate the certificate chain of an IP message.
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=back
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OSSL_CMP_CTX_get_option() reads the current value of the given option
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(e.g., OSSL_CMP_OPT_IMPLICIT_CONFIRM) from the given OSSL_CMP_CTX structure.
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OSSL_CMP_CTX_set_log_cb() sets in I<ctx> the callback function I<cb>
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for handling error queue entries and logging messages.
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When I<cb> is NULL errors are printed to STDERR (if available, else ignored)
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any log messages are ignored.
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Alternatively, L<OSSL_CMP_log_open(3)> may be used to direct logging to STDOUT.
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OSSL_CMP_CTX_set_log_verbosity() is a macro setting the
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OSSL_CMP_OPT_LOG_VERBOSITY context option to the given level.
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OSSL_CMP_CTX_print_errors() outputs any entries in the OpenSSL error queue. It
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is similar to L<ERR_print_errors_cb(3)> but uses the CMP log callback function
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if set in the I<ctx> for uniformity with CMP logging if given. Otherwise it uses
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L<ERR_print_errors(3)> to print to STDERR (unless OPENSSL_NO_STDIO is defined).
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OSSL_CMP_CTX_set1_serverPath() sets the HTTP path of the CMP server on the host,
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also known as "CMP alias".
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The default is C</>.
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OSSL_CMP_CTX_set1_server() sets the given server I<address>
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(which may be a hostname or IP address or NULL) in the given I<ctx>.
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OSSL_CMP_CTX_set_serverPort() sets the port of the CMP server to connect to.
|
|
If not used or the I<port> argument is 0
|
|
the default port applies, which is 80 for HTTP and 443 for HTTPS.
|
|
|
|
OSSL_CMP_CTX_set1_proxy() sets the HTTP proxy to be used for connecting to
|
|
the given CMP server unless overruled by any "no_proxy" settings (see below).
|
|
If TLS is not used this defaults to the value of
|
|
the environment variable C<http_proxy> if set, else C<HTTP_PROXY>.
|
|
Otherwise defaults to the value of C<https_proxy> if set, else C<HTTPS_PROXY>.
|
|
An empty proxy string specifies not to use a proxy.
|
|
Else the format is C<[http[s]://]address[:port][/path]>,
|
|
where any path given is ignored.
|
|
The default port number is 80, or 443 in case C<https:> is given.
|
|
|
|
OSSL_CMP_CTX_set1_no_proxy() sets the list of server hostnames not to use
|
|
an HTTP proxy for. The names may be separated by commas and/or whitespace.
|
|
Defaults to the environment variable C<no_proxy> if set, else C<NO_PROXY>.
|
|
|
|
OSSL_CMP_CTX_set_http_cb() sets the optional BIO connect/disconnect callback
|
|
function, which has the prototype
|
|
|
|
typedef BIO *(*HTTP_bio_cb_t) (BIO *bio, void *arg, int connect, int detail);
|
|
|
|
The callback may modify the I<bio> provided by L<OSSL_CMP_MSG_http_perform(3)>
|
|
as described for the I<bio_update_fn> parameter of L<OSSL_HTTP_open(3)>.
|
|
The callback may make use of a custom defined argument I<arg>,
|
|
as described for the I<arg> parameter of L<OSSL_HTTP_open(3)>.
|
|
The argument is stored in the OSSL_CMP_CTX using OSSL_CMP_CTX_set_http_cb_arg().
|
|
See also the B<OSSL_CMP_OPT_USE_TLS> option described above.
|
|
|
|
OSSL_CMP_CTX_set_http_cb_arg() sets the argument, respectively a pointer to
|
|
a structure containing arguments such as an B<SSL_CTX> structure,
|
|
optionally to be used by the http connect/disconnect callback function.
|
|
I<arg> is not consumed, and it must therefore explicitly be freed when not
|
|
needed any more. I<arg> may be NULL to clear the entry.
|
|
|
|
OSSL_CMP_CTX_get_http_cb_arg() gets the argument, respectively the pointer to a
|
|
structure containing arguments, previously set by
|
|
OSSL_CMP_CTX_set_http_cb_arg() or NULL if unset.
|
|
|
|
OSSL_CMP_CTX_set_transfer_cb() sets the message transfer callback function,
|
|
which has the type
|
|
|
|
typedef OSSL_CMP_MSG *(*OSSL_CMP_transfer_cb_t) (OSSL_CMP_CTX *ctx,
|
|
const OSSL_CMP_MSG *req);
|
|
|
|
Default is NULL, which implies the use of L<OSSL_CMP_MSG_http_perform(3)>.
|
|
The callback should send the CMP request message it obtains via the I<req>
|
|
parameter and on success return the response, else it must return NULL.
|
|
The transfer callback may make use of a custom defined argument stored in
|
|
the ctx by means of OSSL_CMP_CTX_set_transfer_cb_arg(), which may be retrieved
|
|
again through OSSL_CMP_CTX_get_transfer_cb_arg().
|
|
|
|
OSSL_CMP_CTX_set_transfer_cb_arg() sets an argument, respectively a pointer to a
|
|
structure containing arguments, optionally to be used by the transfer callback.
|
|
I<arg> is not consumed, and it must therefore explicitly be freed when not
|
|
needed any more. I<arg> may be NULL to clear the entry.
|
|
|
|
OSSL_CMP_CTX_get_transfer_cb_arg() gets the argument, respectively the pointer
|
|
to a structure containing arguments, previously set by
|
|
OSSL_CMP_CTX_set_transfer_cb_arg() or NULL if unset.
|
|
|
|
OSSL_CMP_CTX_set1_srvCert() sets the expected server cert in I<ctx> and trusts
|
|
it directly (even if it is expired) when verifying signed response messages.
|
|
This pins the accepted CMP server
|
|
and results in ignoring whatever may be set using OSSL_CMP_CTX_set0_trusted().
|
|
Any previously set value is freed.
|
|
The I<cert> argument may be NULL to clear the entry.
|
|
If set, the subject of the certificate is also used
|
|
as default value for the recipient of CMP requests
|
|
and as default value for the expected sender of CMP responses.
|
|
|
|
OSSL_CMP_CTX_set1_expected_sender() sets the Distinguished Name (DN)
|
|
expected in the sender field of incoming CMP messages.
|
|
Defaults to the subject of the pinned server certificate, if any.
|
|
This can be used to make sure that only a particular entity is accepted as
|
|
CMP message signer, and attackers are not able to use arbitrary certificates
|
|
of a trusted PKI hierarchy to fraudulently pose as CMP server.
|
|
Note that this gives slightly more freedom than OSSL_CMP_CTX_set1_srvCert(),
|
|
which pins the server to the holder of a particular certificate, while the
|
|
expected sender name will continue to match after updates of the server cert.
|
|
|
|
OSSL_CMP_CTX_set0_trusted() is an alias of the original
|
|
OSSL_CMP_CTX_set0_trustedStore().
|
|
It sets in the CMP context I<ctx> the certificate store of type X509_STORE
|
|
containing trusted certificates, typically of root CAs.
|
|
This is ignored when a certificate is pinned using OSSL_CMP_CTX_set1_srvCert().
|
|
The store may also hold CRLs and a certificate verification callback function
|
|
used for signature-based peer authentication.
|
|
Any store entry already set before is freed.
|
|
When given a NULL parameter the entry is cleared.
|
|
|
|
OSSL_CMP_CTX_get0_trusted() is an alias of the original
|
|
OSSL_CMP_CTX_get0_trustedStore().
|
|
It extracts from the CMP context I<ctx> the pointer to the currently set
|
|
certificate store containing trust anchors etc., or an empty store if unset.
|
|
|
|
OSSL_CMP_CTX_set1_untrusted() sets up a list of non-trusted certificates
|
|
of intermediate CAs that may be useful for path construction for the own CMP
|
|
signer certificate, for the own TLS certificate (if any), when verifying peer
|
|
CMP protection certificates, and when verifying newly enrolled certificates.
|
|
The reference counts of those certificates handled successfully are increased.
|
|
|
|
OSSL_CMP_CTX_get0_untrusted() returns a pointer to the
|
|
list of untrusted certs in I<ctx>, which may be empty if unset.
|
|
|
|
OSSL_CMP_CTX_set1_cert() sets the CMP I<signer certificate>,
|
|
also called I<protection certificate>,
|
|
related to the private key used for signature-based CMP message protection.
|
|
Therefore the public key of this I<cert> must correspond to
|
|
the private key set before or thereafter via OSSL_CMP_CTX_set1_pkey().
|
|
When using signature-based protection of CMP request messages
|
|
this CMP signer certificate will be included first in the extraCerts field.
|
|
It serves as fallback reference certificate, see OSSL_CMP_CTX_set1_oldCert().
|
|
The subject of this I<cert> will be used as the sender field of outgoing
|
|
messages, while the subject of any cert set via OSSL_CMP_CTX_set1_oldCert(),
|
|
the subject of any PKCS#10 CSR set via OSSL_CMP_CTX_set1_p10CSR(),
|
|
and any value set via OSSL_CMP_CTX_set1_subjectName() are used as fallback.
|
|
|
|
The I<cert> argument may be NULL to clear the entry.
|
|
|
|
OSSL_CMP_CTX_build_cert_chain() builds a certificate chain for the CMP signer
|
|
certificate previously set in the I<ctx>. It adds the optional I<candidates>,
|
|
a list of intermediate CA certs that may already constitute the targeted chain,
|
|
to the untrusted certs that may already exist in the I<ctx>.
|
|
Then the function uses this augmented set of certs for chain construction.
|
|
If I<own_trusted> is NULL it builds the chain as far down as possible and
|
|
ignores any verification errors. Else the CMP signer certificate must be
|
|
verifiable where the chain reaches a trust anchor contained in I<own_trusted>.
|
|
On success the function stores the resulting chain in I<ctx>
|
|
for inclusion in the extraCerts field of signature-protected messages.
|
|
Calling this function is optional; by default a chain construction
|
|
is performed on demand that is equivalent to calling this function
|
|
with the I<candidates> and I<own_trusted> arguments being NULL.
|
|
|
|
OSSL_CMP_CTX_set1_pkey() sets the client's private key corresponding to the
|
|
CMP signer certificate set via OSSL_CMP_CTX_set1_cert().
|
|
This key is used create signature-based protection (protectionAlg = MSG_SIG_ALG)
|
|
of outgoing messages
|
|
unless a symmetric secret has been set via OSSL_CMP_CTX_set1_secretValue().
|
|
The I<pkey> argument may be NULL to clear the entry.
|
|
|
|
OSSL_CMP_CTX_set1_secretValue() sets in I<ctx> the byte string I<sec> of length
|
|
I<len> to use as pre-shared secret, or clears it if the I<sec> argument is NULL.
|
|
If present, this secret is used to create MAC-based authentication and integrity
|
|
protection (rather than applying signature-based protection)
|
|
of outgoing messages and to verify authenticity and integrity of incoming
|
|
messages that have MAC-based protection (protectionAlg = C<MSG_MAC_ALG>).
|
|
|
|
OSSL_CMP_CTX_set1_referenceValue() sets the given referenceValue I<ref> with
|
|
length I<len> in the given I<ctx> or clears it if the I<ref> argument is NULL.
|
|
According to RFC 4210 section 5.1.1, if no value for the sender field in
|
|
CMP message headers can be determined (i.e., no CMP signer certificate
|
|
and no subject DN is set via OSSL_CMP_CTX_set1_subjectName()
|
|
then the sender field will contain the NULL-DN
|
|
and the senderKID field of the CMP message header must be set.
|
|
When signature-based protection is used the senderKID will be set to
|
|
the subjectKeyIdentifier of the CMP signer certificate as far as present.
|
|
If not present or when MAC-based protection is used
|
|
the I<ref> value is taken as the fallback value for the senderKID.
|
|
|
|
OSSL_CMP_CTX_set1_recipient() sets the recipient name that will be used in the
|
|
PKIHeader of CMP request messages, i.e. the X509 name of the (CA) server.
|
|
|
|
The recipient field in the header of a CMP message is mandatory.
|
|
If not given explicitly the recipient is determined in the following order:
|
|
the subject of the CMP server certificate set using OSSL_CMP_CTX_set1_srvCert(),
|
|
the value set using OSSL_CMP_CTX_set1_issuer(),
|
|
the issuer of the certificate set using OSSL_CMP_CTX_set1_oldCert(),
|
|
the issuer of the CMP signer certificate,
|
|
as far as any of those is present, else the NULL-DN as last resort.
|
|
|
|
OSSL_CMP_CTX_push0_geninfo_ITAV() adds I<itav> to the stack in the I<ctx> to be
|
|
added to the GeneralInfo field of the CMP PKIMessage header of a request
|
|
message sent with this context.
|
|
|
|
OSSL_CMP_CTX_reset_geninfo_ITAVs()
|
|
clears any ITAVs that were added by OSSL_CMP_CTX_push0_geninfo_ITAV().
|
|
|
|
OSSL_CMP_CTX_set1_extraCertsOut() sets the stack of extraCerts that will be
|
|
sent to remote.
|
|
|
|
OSSL_CMP_CTX_set0_newPkey() can be used to explicitly set the given EVP_PKEY
|
|
structure as the private or public key to be certified in the CMP context.
|
|
The I<priv> parameter must be 0 if and only if the given key is a public key.
|
|
|
|
OSSL_CMP_CTX_get0_newPkey() gives the key to use for certificate enrollment
|
|
dependent on fields of the CMP context structure:
|
|
the newPkey (which may be a private or public key) if present,
|
|
else the public key in the p10CSR if present, else the client's private key.
|
|
If the I<priv> parameter is not 0 and the selected key does not have a
|
|
private component then NULL is returned.
|
|
|
|
OSSL_CMP_CTX_set1_issuer() sets the name of the intended issuer that
|
|
will be set in the CertTemplate, i.e., the X509 name of the CA server.
|
|
|
|
OSSL_CMP_CTX_set1_serialNumber() sets the serial number optionally used to
|
|
select the certificate to be revoked in Revocation Requests (RR).
|
|
|
|
OSSL_CMP_CTX_set1_subjectName() sets the subject DN that will be used in
|
|
the CertTemplate structure when requesting a new cert. For Key Update Requests
|
|
(KUR), it defaults to the subject DN of the reference certificate,
|
|
see OSSL_CMP_CTX_set1_oldCert(). This default is used for Initialization
|
|
Requests (IR) and Certification Requests (CR) only if no SANs are set.
|
|
The I<subjectName> is also used as fallback for the sender field
|
|
of outgoing CMP messages if no reference certificate is available.
|
|
|
|
OSSL_CMP_CTX_push1_subjectAltName() adds the given X509 name to the list of
|
|
alternate names on the certificate template request. This cannot be used if
|
|
any Subject Alternative Name extension is set via
|
|
OSSL_CMP_CTX_set0_reqExtensions().
|
|
By default, unless B<OSSL_CMP_OPT_SUBJECTALTNAME_NODEFAULT> has been set,
|
|
the Subject Alternative Names are copied from the reference certificate,
|
|
see OSSL_CMP_CTX_set1_oldCert().
|
|
If set and the subject DN is not set with OSSL_CMP_CTX_set1_subjectName() then
|
|
the certificate template of an IR and CR will not be filled with the default
|
|
subject DN from the reference certificate.
|
|
If a subject DN is desired it needs to be set explicitly with
|
|
OSSL_CMP_CTX_set1_subjectName().
|
|
|
|
OSSL_CMP_CTX_set0_reqExtensions() sets the X.509v3 extensions to be used in
|
|
IR/CR/KUR.
|
|
|
|
OSSL_CMP_CTX_reqExtensions_have_SAN() returns 1 if the context contains
|
|
a Subject Alternative Name extension, else 0 or -1 on error.
|
|
|
|
OSSL_CMP_CTX_push0_policy() adds the certificate policy info object
|
|
to the X509_EXTENSIONS of the requested certificate template.
|
|
|
|
OSSL_CMP_CTX_set1_oldCert() sets the old certificate to be updated in
|
|
Key Update Requests (KUR) or to be revoked in Revocation Requests (RR).
|
|
For RR, this is ignored if an issuer name and a serial number are provided using
|
|
OSSL_CMP_CTX_set1_issuer() and OSSL_CMP_CTX_set1_serialNumber(), respectively.
|
|
For IR/CR/KUR this sets the I<reference certificate>,
|
|
which otherwise defaults to the CMP signer certificate.
|
|
The I<reference certificate> determined this way, if any, is used for providing
|
|
default public key, subject DN, Subject Alternative Names, and issuer DN entries
|
|
in the requested certificate template of IR/CR/KUR messages.
|
|
|
|
The subject of the reference certificate is used as the sender field value
|
|
in CMP message headers.
|
|
Its issuer is used as default recipient in CMP message headers.
|
|
|
|
OSSL_CMP_CTX_set1_p10CSR() sets the PKCS#10 CSR to use in P10CR messages.
|
|
If such a CSR is provided, its subject and public key fields are also
|
|
used as fallback values for the certificate template of IR/CR/KUR/RR messages,
|
|
and any extensions included are added to the template of IR/CR/KUR messages.
|
|
|
|
OSSL_CMP_CTX_push0_genm_ITAV() adds I<itav> to the stack in the I<ctx> which
|
|
will be the body of a General Message sent with this context.
|
|
|
|
OSSL_CMP_certConf_cb() is the default certificate confirmation callback function.
|
|
If the callback argument is not NULL it must point to a trust store.
|
|
In this case the function checks that the newly enrolled certificate can be
|
|
verified using this trust store and untrusted certificates from the I<ctx>,
|
|
which have been augmented by the list of extraCerts received.
|
|
During this verification, any certificate status checking is disabled.
|
|
If the callback argument is NULL the function tries building an approximate
|
|
chain as far as possible using the same untrusted certificates from the I<ctx>,
|
|
and if this fails it takes the received extraCerts as fallback.
|
|
The resulting cert chain can be retrieved using OSSL_CMP_CTX_get1_newChain().
|
|
|
|
OSSL_CMP_CTX_set_certConf_cb() sets the callback used for evaluating the newly
|
|
enrolled certificate before the library sends, depending on its result,
|
|
a positive or negative certConf message to the server. The callback has type
|
|
|
|
typedef int (*OSSL_CMP_certConf_cb_t) (OSSL_CMP_CTX *ctx, X509 *cert,
|
|
int fail_info, const char **txt);
|
|
|
|
and should inspect the certificate it obtains via the I<cert> parameter and may
|
|
overrule the pre-decision given in the I<fail_info> and I<*txt> parameters.
|
|
If it accepts the certificate it must return 0, indicating success. Else it must
|
|
return a bit field reflecting PKIFailureInfo with at least one failure bit and
|
|
may set the I<*txt> output parameter to point to a string constant with more
|
|
detail. The transfer callback may make use of a custom defined argument stored
|
|
in the I<ctx> by means of OSSL_CMP_CTX_set_certConf_cb_arg(), which may be
|
|
retrieved again through OSSL_CMP_CTX_get_certConf_cb_arg().
|
|
Typically, the callback will check at least that the certificate can be verified
|
|
using a set of trusted certificates.
|
|
It also could compare the subject DN and other fields of the newly
|
|
enrolled certificate with the certificate template of the request.
|
|
|
|
OSSL_CMP_CTX_set_certConf_cb_arg() sets an argument, respectively a pointer to a
|
|
structure containing arguments, optionally to be used by the certConf callback.
|
|
I<arg> is not consumed, and it must therefore explicitly be freed when not
|
|
needed any more. I<arg> may be NULL to clear the entry.
|
|
|
|
OSSL_CMP_CTX_get_certConf_cb_arg() gets the argument, respectively the pointer
|
|
to a structure containing arguments, previously set by
|
|
OSSL_CMP_CTX_set_certConf_cb_arg(), or NULL if unset.
|
|
|
|
OSSL_CMP_CTX_get_status() returns for client contexts the PKIstatus from
|
|
the last received CertRepMessage or Revocation Response or error message:
|
|
=item B<OSSL_CMP_PKISTATUS_accepted> on successful receipt of a GENP message:
|
|
|
|
=over 4
|
|
|
|
=item B<OSSL_CMP_PKISTATUS_request>
|
|
|
|
if an IR/CR/KUR/RR/GENM request message could not be produced,
|
|
|
|
=item B<OSSL_CMP_PKISTATUS_trans>
|
|
|
|
on a transmission error or transaction error for this type of request, and
|
|
|
|
=item B<OSSL_CMP_PKISTATUS_unspecified>
|
|
|
|
if no such request was attempted or OSSL_CMP_CTX_reinit() has been called.
|
|
|
|
=back
|
|
|
|
For server contexts it returns
|
|
B<OSSL_CMP_PKISTATUS_trans> if a transaction is open,
|
|
otherwise B<OSSL_CMP_PKISTATUS_unspecified>.
|
|
|
|
OSSL_CMP_CTX_get0_statusString() returns the statusString from the last received
|
|
CertRepMessage or Revocation Response or error message, or NULL if unset.
|
|
|
|
OSSL_CMP_CTX_get_failInfoCode() returns the error code from the failInfo field
|
|
of the last received CertRepMessage or Revocation Response or error message,
|
|
or -1 if no such response was received or OSSL_CMP_CTX_reinit() has been called.
|
|
This is a bit field and the flags for it are specified in the header file
|
|
F<< <openssl/cmp.h> >>.
|
|
The flags start with OSSL_CMP_CTX_FAILINFO, for example:
|
|
OSSL_CMP_CTX_FAILINFO_badAlg. Returns -1 if the failInfoCode field is unset.
|
|
|
|
OSSL_CMP_CTX_get0_validatedSrvCert() returns
|
|
the successfully validated certificate, if any, that the CMP server used
|
|
in the current transaction for signature-based response message protection,
|
|
or NULL if the server used MAC-based protection.
|
|
The value is relevant only at the end of a successful transaction.
|
|
It may be used to check the authorization of the server based on its cert.
|
|
|
|
OSSL_CMP_CTX_get0_newCert() returns the pointer to the newly obtained
|
|
certificate in case it is available, else NULL.
|
|
|
|
OSSL_CMP_CTX_get1_newChain() returns a pointer to a duplicate of the stack of
|
|
X.509 certificates computed by OSSL_CMP_certConf_cb() (if this function has
|
|
been called) on the last received certificate response message IP/CP/KUP.
|
|
|
|
OSSL_CMP_CTX_get1_caPubs() returns a pointer to a duplicate of the list of
|
|
X.509 certificates in the caPubs field of the last received certificate
|
|
response message (of type IP, CP, or KUP),
|
|
or an empty stack if no caPubs have been received in the current transaction.
|
|
|
|
OSSL_CMP_CTX_get1_extraCertsIn() returns a pointer to a duplicate of the list
|
|
of X.509 certificates contained in the extraCerts field of the last received
|
|
response message (except for pollRep and PKIConf), or
|
|
an empty stack if no extraCerts have been received in the current transaction.
|
|
|
|
OSSL_CMP_CTX_set1_transactionID() sets the given transaction ID in the given
|
|
OSSL_CMP_CTX structure.
|
|
|
|
OSSL_CMP_CTX_set1_senderNonce() stores the last sent sender I<nonce> in
|
|
the I<ctx>. This will be used to validate the recipNonce in incoming messages.
|
|
|
|
=head1 NOTES
|
|
|
|
CMP is defined in RFC 4210 (and CRMF in RFC 4211).
|
|
|
|
=head1 RETURN VALUES
|
|
|
|
OSSL_CMP_CTX_free() and OSSL_CMP_CTX_print_errors() do not return anything.
|
|
|
|
OSSL_CMP_CTX_new(),
|
|
OSSL_CMP_CTX_get0_libctx(), OSSL_CMP_CTX_get0_propq(),
|
|
OSSL_CMP_CTX_get_http_cb_arg(),
|
|
OSSL_CMP_CTX_get_transfer_cb_arg(),
|
|
OSSL_CMP_CTX_get0_trusted(),
|
|
OSSL_CMP_CTX_get0_untrusted(),
|
|
OSSL_CMP_CTX_get0_newPkey(),
|
|
OSSL_CMP_CTX_get_certConf_cb_arg(),
|
|
OSSL_CMP_CTX_get0_statusString(),
|
|
OSSL_CMP_CTX_get0_validatedSrvCert(),
|
|
OSSL_CMP_CTX_get0_newCert(),
|
|
OSSL_CMP_CTX_get0_newChain(),
|
|
OSSL_CMP_CTX_get1_caPubs(), and
|
|
OSSL_CMP_CTX_get1_extraCertsIn()
|
|
return the intended pointer value as described above or NULL on error.
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OSSL_CMP_CTX_get_option(),
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OSSL_CMP_CTX_reqExtensions_have_SAN(),
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OSSL_CMP_CTX_get_status(), and
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OSSL_CMP_CTX_get_failInfoCode()
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return the intended value as described above or -1 on error.
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OSSL_CMP_certConf_cb() returns I<fail_info> if it is not equal to 0,
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else 0 on successful validation,
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or else a bit field with the B<OSSL_CMP_PKIFAILUREINFO_incorrectData> bit set.
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All other functions, including OSSL_CMP_CTX_reinit()
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and OSSL_CMP_CTX_reset_geninfo_ITAVs(),
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return 1 on success, 0 on error.
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=head1 EXAMPLES
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The following code omits error handling.
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Set up a CMP client context for sending requests and verifying responses:
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cmp_ctx = OSSL_CMP_CTX_new();
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OSSL_CMP_CTX_set1_server(cmp_ctx, name_or_address);
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OSSL_CMP_CTX_set1_serverPort(cmp_ctx, port_string);
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OSSL_CMP_CTX_set1_serverPath(cmp_ctx, path_or_alias);
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OSSL_CMP_CTX_set0_trusted(cmp_ctx, ts);
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|
|
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Set up symmetric credentials for MAC-based message protection such as PBM:
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|
OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, ref, ref_len);
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OSSL_CMP_CTX_set1_secretValue(cmp_ctx, sec, sec_len);
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|
|
Set up the details for certificate requests:
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|
|
|
OSSL_CMP_CTX_set1_subjectName(cmp_ctx, name);
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OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, initialKey);
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|
|
|
Perform an Initialization Request transaction:
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|
|
initialCert = OSSL_CMP_exec_IR_ses(cmp_ctx);
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|
|
Reset the transaction state of the CMP context and the credentials:
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|
|
|
OSSL_CMP_CTX_reinit(cmp_ctx);
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|
OSSL_CMP_CTX_set1_referenceValue(cmp_ctx, NULL, 0);
|
|
OSSL_CMP_CTX_set1_secretValue(cmp_ctx, NULL, 0);
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|
|
|
Perform a Certification Request transaction, making use of the new credentials:
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|
|
|
OSSL_CMP_CTX_set1_cert(cmp_ctx, initialCert);
|
|
OSSL_CMP_CTX_set1_pkey(cmp_ctx, initialKey);
|
|
OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, curentKey);
|
|
currentCert = OSSL_CMP_exec_CR_ses(cmp_ctx);
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|
|
|
Perform a Key Update Request, signed using the cert (and key) to be updated:
|
|
|
|
OSSL_CMP_CTX_reinit(cmp_ctx);
|
|
OSSL_CMP_CTX_set1_cert(cmp_ctx, currentCert);
|
|
OSSL_CMP_CTX_set1_pkey(cmp_ctx, currentKey);
|
|
OSSL_CMP_CTX_set0_newPkey(cmp_ctx, 1, updatedKey);
|
|
currentCert = OSSL_CMP_exec_KUR_ses(cmp_ctx);
|
|
currentKey = updatedKey;
|
|
|
|
Perform a General Message transaction including, as an example,
|
|
the id-it-signKeyPairTypes OID and prints info on the General Response contents:
|
|
|
|
OSSL_CMP_CTX_reinit(cmp_ctx);
|
|
|
|
ASN1_OBJECT *type = OBJ_txt2obj("1.3.6.1.5.5.7.4.2", 1);
|
|
OSSL_CMP_ITAV *itav = OSSL_CMP_ITAV_create(type, NULL);
|
|
OSSL_CMP_CTX_push0_genm_ITAV(cmp_ctx, itav);
|
|
|
|
STACK_OF(OSSL_CMP_ITAV) *itavs;
|
|
itavs = OSSL_CMP_exec_GENM_ses(cmp_ctx);
|
|
print_itavs(itavs);
|
|
sk_OSSL_CMP_ITAV_pop_free(itavs, OSSL_CMP_ITAV_free);
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<OSSL_CMP_exec_IR_ses(3)>, L<OSSL_CMP_exec_CR_ses(3)>,
|
|
L<OSSL_CMP_exec_KUR_ses(3)>, L<OSSL_CMP_exec_GENM_ses(3)>,
|
|
L<OSSL_CMP_exec_certreq(3)>, L<OSSL_CMP_MSG_http_perform(3)>,
|
|
L<ERR_print_errors_cb(3)>, L<OSSL_HTTP_open(3)>
|
|
|
|
=head1 HISTORY
|
|
|
|
The OpenSSL CMP support was added in OpenSSL 3.0.
|
|
|
|
OSSL_CMP_CTX_get0_trustedStore() was renamed to OSSL_CMP_CTX_get0_trusted() and
|
|
OSSL_CMP_CTX_set0_trustedStore() was renamed to OSSL_CMP_CTX_set0_trusted(),
|
|
using macros, while keeping the old names for backward compatibility,
|
|
in OpenSSL 3.2.
|
|
|
|
OSSL_CMP_CTX_reset_geninfo_ITAVs() was added in OpenSSL 3.0.8.
|
|
|
|
OSSL_CMP_CTX_get0_libctx(), OSSL_CMP_CTX_get0_propq(), and
|
|
OSSL_CMP_CTX_get0_validatedSrvCert() were added in OpenSSL 3.2.
|
|
|
|
OSSL_CMP_CTX_set1_serialNumber() was added in OpenSSL 3.2.
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2007-2023 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the Apache License 2.0 (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|