Cryptography and SSL/TLS Toolkit



OSSL_CMP_SRV_process_request, OSSL_CMP_CTX_server_perform, OSSL_CMP_SRV_CTX_new, OSSL_CMP_SRV_CTX_free, OSSL_CMP_SRV_cert_request_cb_t, OSSL_CMP_SRV_rr_cb_t, OSSL_CMP_SRV_certConf_cb_t, OSSL_CMP_SRV_genm_cb_t, OSSL_CMP_SRV_error_cb_t, OSSL_CMP_SRV_pollReq_cb_t, OSSL_CMP_SRV_CTX_init, OSSL_CMP_SRV_delayed_delivery_cb_t, OSSL_CMP_SRV_clean_transaction_cb_t, OSSL_CMP_SRV_CTX_init_trans, OSSL_CMP_SRV_CTX_get0_cmp_ctx, OSSL_CMP_SRV_CTX_get0_custom_ctx, OSSL_CMP_SRV_CTX_set_send_unprotected_errors, OSSL_CMP_SRV_CTX_set_accept_unprotected, OSSL_CMP_SRV_CTX_set_accept_raverified, OSSL_CMP_SRV_CTX_set_grant_implicit_confirm - generic functions to set up and control a CMP server


#include <openssl/cmp.h>

OSSL_CMP_MSG *OSSL_CMP_SRV_process_request(OSSL_CMP_SRV_CTX *srv_ctx,
                                           const OSSL_CMP_MSG *req);
OSSL_CMP_MSG *OSSL_CMP_CTX_server_perform(OSSL_CMP_CTX *client_ctx,
                                          const OSSL_CMP_MSG *req);
OSSL_CMP_SRV_CTX *OSSL_CMP_SRV_CTX_new(OSSL_LIB_CTX *libctx, const char *propq);
void OSSL_CMP_SRV_CTX_free(OSSL_CMP_SRV_CTX *srv_ctx);

typedef OSSL_CMP_PKISI *(*OSSL_CMP_SRV_cert_request_cb_t)(
                                                OSSL_CMP_SRV_CTX *srv_ctx,
                                                const OSSL_CMP_MSG *req,
                                                int certReqId,
                                                const OSSL_CRMF_MSG *crm,
                                                const X509_REQ *p10cr,
                                                X509 **certOut,
                                                STACK_OF(X509) **chainOut,
                                                STACK_OF(X509) **caPubs);
typedef OSSL_CMP_PKISI *(*OSSL_CMP_SRV_rr_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                                const OSSL_CMP_MSG *req,
                                                const X509_NAME *issuer,
                                                const ASN1_INTEGER *serial);
typedef int (*OSSL_CMP_SRV_genm_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                      const OSSL_CMP_MSG *req,
                                      STACK_OF(OSSL_CMP_ITAV) *in,
                                      STACK_OF(OSSL_CMP_ITAV) **out);
typedef void (*OSSL_CMP_SRV_error_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                        const OSSL_CMP_MSG *req,
                                        const OSSL_CMP_PKISI *statusInfo,
                                        const ASN1_INTEGER *errorCode,
                                        const OSSL_CMP_PKIFREETEXT *errorDetails);
typedef int (*OSSL_CMP_SRV_certConf_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                          const OSSL_CMP_MSG *req,
                                          int certReqId,
                                          const ASN1_OCTET_STRING *certHash,
                                          const OSSL_CMP_PKISI *si);
typedef int (*OSSL_CMP_SRV_pollReq_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                         const OSSL_CMP_MSG *req,
                                         int certReqId,
                                         OSSL_CMP_MSG **certReq,
                                         int64_t *check_after);
int OSSL_CMP_SRV_CTX_init(OSSL_CMP_SRV_CTX *srv_ctx, void *custom_ctx,
                          OSSL_CMP_SRV_cert_request_cb_t process_cert_request,
                          OSSL_CMP_SRV_rr_cb_t process_rr,
                          OSSL_CMP_SRV_genm_cb_t process_genm,
                          OSSL_CMP_SRV_error_cb_t process_error,
                          OSSL_CMP_SRV_certConf_cb_t process_certConf,
                          OSSL_CMP_SRV_pollReq_cb_t process_pollReq);
typedef int (*OSSL_CMP_SRV_delayed_delivery_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                                  const OSSL_CMP_MSG *req);
typedef int (*OSSL_CMP_SRV_clean_transaction_cb_t)(OSSL_CMP_SRV_CTX *srv_ctx,
                                                   const ASN1_OCTET_STRING *id);
int OSSL_CMP_SRV_CTX_init_trans(OSSL_CMP_SRV_CTX *srv_ctx,
                                OSSL_CMP_SRV_delayed_delivery_cb_t delay,
                                OSSL_CMP_SRV_clean_transaction_cb_t clean);

OSSL_CMP_CTX *OSSL_CMP_SRV_CTX_get0_cmp_ctx(const OSSL_CMP_SRV_CTX *srv_ctx);
void *OSSL_CMP_SRV_CTX_get0_custom_ctx(const OSSL_CMP_SRV_CTX *srv_ctx);

int OSSL_CMP_SRV_CTX_set_send_unprotected_errors(OSSL_CMP_SRV_CTX *srv_ctx,
                                                 int val);
int OSSL_CMP_SRV_CTX_set_accept_unprotected(OSSL_CMP_SRV_CTX *srv_ctx, int val);
int OSSL_CMP_SRV_CTX_set_accept_raverified(OSSL_CMP_SRV_CTX *srv_ctx, int val);
int OSSL_CMP_SRV_CTX_set_grant_implicit_confirm(OSSL_CMP_SRV_CTX *srv_ctx,
                                                int val);


OSSL_CMP_SRV_process_request() implements the generic aspects of a CMP server. Its arguments are the OSSL_CMP_SRV_CTX srv_ctx and the CMP request message req. It does the typical generic checks on req, calls the respective callback function (if present) for more specific processing, and then assembles a result message, which may be a CMP error message. If after return of the function the expression OSSL_CMP_CTX_get_status(OSSL_CMP_SRV_CTX_get0_cmp_ctx(srv_ctx)) yields -1 then the function has closed the current transaction, which may be due to normal successful end of the transaction or due to an error.

OSSL_CMP_CTX_server_perform() is an interface to OSSL_CMP_SRV_process_request() that can be used by a CMP client in the same way as OSSL_CMP_MSG_http_perform(3). The OSSL_CMP_SRV_CTX must be set as transfer_cb_arg of client_ctx.

OSSL_CMP_SRV_CTX_new() creates and initializes an OSSL_CMP_SRV_CTX structure associated with the library context libctx and property query string propq, both of which may be NULL to select the defaults.

OSSL_CMP_SRV_CTX_free() deletes the given srv_ctx. If the argument is NULL, nothing is done.

OSSL_CMP_SRV_CTX_init() sets in the given srv_ctx a custom server context pointer as well as callback functions performing the specific processing of CMP certificate requests, revocation requests, certificate confirmation requests, general messages, error messages, and poll requests. All arguments except srv_ctx may be NULL. If a callback for some message type is not given this means that the respective type of CMP message is not supported by the server.

OSSL_CMP_SRV_CTX_init_trans() sets in srv_ctx the optional callback functions for initiating delayed delivery and cleaning up a transaction. If the <delay> function is NULL then delivery of responses is never delayed. Otherwise delay takes a custom server context and a request message as input. It must return 1 if delivery of the respective response shall be delayed, 0 if not, and -1 on error. If the <clean> function is NULL then no specific cleanup is performed. Otherwise clean takes a custom server context and a transaction ID pointer as input, where the pointer is NULL in case a new transaction is being started and otherwise provides the ID of the transaction being terminated. The <clean> function should reset the respective portions of the state and free related memory. It must return 1 on success and 0 on error.

OSSL_CMP_SRV_CTX_get0_cmp_ctx() returns the OSSL_CMP_CTX from the srv_ctx.

OSSL_CMP_SRV_CTX_get0_custom_ctx() returns the custom server context from srv_ctx that has been set using OSSL_CMP_SRV_CTX_init().

OSSL_CMP_SRV_CTX_set_send_unprotected_errors() enables sending error messages and other forms of negative responses unprotected.

OSSL_CMP_SRV_CTX_set_accept_unprotected() enables acceptance of requests without protection of with invalid protection.

OSSL_CMP_SRV_CTX_set_accept_raverified() enables acceptance of ir/cr/kur messages with POPO 'RAVerified'.

OSSL_CMP_SRV_CTX_set_grant_implicit_confirm() enables granting implicit confirmation of newly enrolled certificates if requested.


CMP is defined in RFC 4210 (and CRMF in RFC 4211).

So far the CMP server implementation is limited to one request per CMP message (and consequently to at most one response component per CMP message).


OSSL_CMP_SRV_CTX_new() returns a OSSL_CMP_SRV_CTX structure on success, NULL on error.

OSSL_CMP_SRV_CTX_free() does not return a value.

OSSL_CMP_SRV_CTX_get0_cmp_ctx() returns a OSSL_CMP_CTX structure on success, NULL on error.

OSSL_CMP_SRV_CTX_get0_custom_ctx() returns the custom server context that has been set using OSSL_CMP_SRV_CTX_init().

All other functions return 1 on success, 0 on error.


The OpenSSL CMP support was added in OpenSSL 3.0.

OSSL_CMP_SRV_CTX_init_trans() supporting delayed delivery of all types of response messages was added in OpenSSL 3.3.

Copyright 2007-2021 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