/*

 * Copyright 2007-2025 The OpenSSL Project Authors. All Rights Reserved.

 * Copyright Nokia 2007-2019

 * Copyright Siemens AG 2015-2019

 *

 * 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

 * https://www.openssl.org/source/license.html

 */

#include "cmp_local.h"

#include "internal/cryptlib.h"

/* explicit #includes not strictly needed since implied by the above: */

#include <openssl/bio.h>

#include <openssl/cmp.h>

#include <openssl/err.h>

#include <openssl/evp.h>

#include <openssl/x509v3.h>

#include <openssl/cmp_util.h>

#define IS_CREP(t) ((t) == OSSL_CMP_PKIBODY_IP || (t) == OSSL_CMP_PKIBODY_CP \

    || (t) == OSSL_CMP_PKIBODY_KUP)

/*-

 * Evaluate whether there's an exception (violating the standard) configured for

 * handling negative responses without protection or with invalid protection.

 * Returns 1 on acceptance, 0 on rejection, or -1 on (internal) error.

 */

static int unprotected_exception(const OSSL_CMP_CTX *ctx,

    const OSSL_CMP_MSG *rep,

    int invalid_protection,

    ossl_unused int expected_type)

{

    int rcvd_type = OSSL_CMP_MSG_get_bodytype(rep /* may be NULL */);

    const char *msg_type = NULL;

    if (!ossl_assert(ctx != NULL && rep != NULL))

        return -1;

    if (!ctx->unprotectedErrors)

        return 0;

    switch (rcvd_type) {

    case OSSL_CMP_PKIBODY_ERROR:

        msg_type = "error response";

        break;

    case OSSL_CMP_PKIBODY_RP: {

        OSSL_CMP_PKISI *si = ossl_cmp_revrepcontent_get_pkisi(rep->body->value.rp,

            OSSL_CMP_REVREQSID);

        if (si == NULL)

            return -1;

        if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_rejection)

            msg_type = "revocation response message with rejection status";

        break;

    }

    case OSSL_CMP_PKIBODY_PKICONF:

        msg_type = "PKI Confirmation message";

        break;

    default:

        if (IS_CREP(rcvd_type)) {

            int any_rid = OSSL_CMP_CERTREQID_NONE;

            OSSL_CMP_CERTREPMESSAGE *crepmsg = rep->body->value.ip;

            OSSL_CMP_CERTRESPONSE *crep = ossl_cmp_certrepmessage_get0_certresponse(crepmsg, any_rid);

            if (sk_OSSL_CMP_CERTRESPONSE_num(crepmsg->response) > 1)

                return -1;

            if (crep == NULL)

                return -1;

            if (ossl_cmp_pkisi_get_status(crep->status)

                == OSSL_CMP_PKISTATUS_rejection)

                msg_type = "CertRepMessage with rejection status";

        }

    }

    if (msg_type == NULL)

        return 0;

    ossl_cmp_log2(WARN, ctx, "ignoring %s protection of %s",

        invalid_protection ? "invalid" : "missing", msg_type);

    return 1;

}

/* Save error info from PKIStatusInfo field of a certresponse into ctx */

static int save_statusInfo(OSSL_CMP_CTX *ctx, OSSL_CMP_PKISI *si)

{

    int i;

    OSSL_CMP_PKIFREETEXT *ss;

    if (!ossl_assert(ctx != NULL && si != NULL))

        return 0;

    ctx->status = ossl_cmp_pkisi_get_status(si);

    if (ctx->status < OSSL_CMP_PKISTATUS_accepted)

        return 0;

    ctx->failInfoCode = ossl_cmp_pkisi_get_pkifailureinfo(si);

    if (!ossl_cmp_ctx_set0_statusString(ctx, sk_ASN1_UTF8STRING_new_null())

        || (ctx->statusString == NULL))

        return 0;

    ss = si->statusString; /* may be NULL */

    for (i = 0; i < sk_ASN1_UTF8STRING_num(ss); i++) {

        ASN1_UTF8STRING *str = sk_ASN1_UTF8STRING_value(ss, i);

        ASN1_UTF8STRING *dup = ASN1_STRING_dup(str);

        if (dup == NULL || !sk_ASN1_UTF8STRING_push(ctx->statusString, dup)) {

            ASN1_UTF8STRING_free(dup);

            return 0;

        }

    }

    return 1;

}

static int is_crep_with_waiting(const OSSL_CMP_MSG *resp, int rid)

{

    OSSL_CMP_CERTREPMESSAGE *crepmsg;

    OSSL_CMP_CERTRESPONSE *crep;

    int bt = OSSL_CMP_MSG_get_bodytype(resp);

    if (!IS_CREP(bt))

        return 0;

    crepmsg = resp->body->value.ip; /* same for cp and kup */

    crep = ossl_cmp_certrepmessage_get0_certresponse(crepmsg, rid);

    return (crep != NULL

        && ossl_cmp_pkisi_get_status(crep->status)

            == OSSL_CMP_PKISTATUS_waiting);

}

/*-

 * Perform the generic aspects of sending a request and receiving a response.

 * Returns 1 on success and provides the received PKIMESSAGE in *rep.

 * Returns 0 on error.

 * Regardless of success, caller is responsible for freeing *rep (unless NULL).

 */

static int send_receive_check(OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *req,

    OSSL_CMP_MSG **rep, int expected_type)

{

    int begin_transaction = expected_type != OSSL_CMP_PKIBODY_POLLREP

        && expected_type != OSSL_CMP_PKIBODY_PKICONF;

    const char *req_type_str = ossl_cmp_bodytype_to_string(OSSL_CMP_MSG_get_bodytype(req));

    const char *expected_type_str = ossl_cmp_bodytype_to_string(expected_type);

    int bak_msg_timeout = ctx->msg_timeout;

    int bt;

    time_t now = time(NULL);

    int time_left;

    OSSL_CMP_transfer_cb_t transfer_cb = ctx->transfer_cb;

#ifndef OPENSSL_NO_HTTP

    if (transfer_cb == NULL)

        transfer_cb = OSSL_CMP_MSG_http_perform;

#endif

    *rep = NULL;

    if (ctx->total_timeout != 0 /* not waiting indefinitely */) {

        if (begin_transaction)

            ctx->end_time = now + ctx->total_timeout;

        if (now >= ctx->end_time) {

            ERR_raise(ERR_LIB_CMP, CMP_R_TOTAL_TIMEOUT);

            return 0;

        }

        if (!ossl_assert(ctx->end_time - now < INT_MAX)) {

            /* actually cannot happen due to assignment in initial_certreq() */

            ERR_raise(ERR_LIB_CMP, CMP_R_INVALID_ARGS);

            return 0;

        }

        time_left = (int)(ctx->end_time - now);

        if (ctx->msg_timeout == 0 || time_left < ctx->msg_timeout)

            ctx->msg_timeout = time_left;

    }

    /* should print error queue since transfer_cb may call ERR_clear_error() */

    OSSL_CMP_CTX_print_errors(ctx);

    if (ctx->server != NULL)

        ossl_cmp_log1(INFO, ctx, "sending %s", req_type_str);

    *rep = (*transfer_cb)(ctx, req);

    ctx->msg_timeout = bak_msg_timeout;

    if (*rep == NULL) {

        ERR_raise_data(ERR_LIB_CMP,

            ctx->total_timeout != 0 && time(NULL) >= ctx->end_time ? CMP_R_TOTAL_TIMEOUT : CMP_R_TRANSFER_ERROR,

            "request sent: %s, expected response: %s",

            req_type_str, expected_type_str);

        return 0;

    }

    bt = OSSL_CMP_MSG_get_bodytype(*rep);

    /*

     * The body type in the 'bt' variable is not yet verified.

     * Still we use this preliminary value already for a progress report because

     * the following msg verification may also produce log entries and may fail.

     */

    ossl_cmp_log2(INFO, ctx, "received %s%s", ossl_cmp_bodytype_to_string(bt),

        ossl_cmp_is_error_with_waiting(*rep) ? " (waiting)" : "");

    /* copy received extraCerts to ctx->extraCertsIn so they can be retrieved */

    if (bt != OSSL_CMP_PKIBODY_POLLREP && bt != OSSL_CMP_PKIBODY_PKICONF

        && !ossl_cmp_ctx_set1_extraCertsIn(ctx, (*rep)->extraCerts))

        return 0;

    if (!ossl_cmp_msg_check_update(ctx, *rep, unprotected_exception,

            expected_type))

        return 0;

    /*

     * rep can have the expected response type, which during polling is pollRep.

     * When polling, also any other non-error response (the final response)

     * is fine here. When not yet polling, delayed delivery may be initiated

     * by the server returning an error message with 'waiting' status (or a

     * response message of expected type ip/cp/kup with 'waiting' status).

     */

    if (bt == expected_type

        || (expected_type == OSSL_CMP_PKIBODY_POLLREP

                ? bt != OSSL_CMP_PKIBODY_ERROR

                : ossl_cmp_is_error_with_waiting(*rep)))

        return 1;

    /* received message type is not one of the expected ones (e.g., error) */

    ERR_raise(ERR_LIB_CMP, bt == OSSL_CMP_PKIBODY_ERROR ? CMP_R_RECEIVED_ERROR : CMP_R_UNEXPECTED_PKIBODY); /* in next line for mkerr.pl */

    if (bt != OSSL_CMP_PKIBODY_ERROR) {

        ERR_add_error_data(3, "message type is '",

            ossl_cmp_bodytype_to_string(bt), "'");

    } else {

        OSSL_CMP_ERRORMSGCONTENT *emc = (*rep)->body->value.error;

        OSSL_CMP_PKISI *si = emc->pKIStatusInfo;

        char buf[OSSL_CMP_PKISI_BUFLEN];

        if (save_statusInfo(ctx, si)

            && OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf,

                   sizeof(buf))

                != NULL)

            ERR_add_error_data(1, buf);

        if (emc->errorCode != NULL

            && BIO_snprintf(buf, sizeof(buf), "; errorCode: %08lX",

                   ASN1_INTEGER_get(emc->errorCode))

                > 0)

            ERR_add_error_data(1, buf);

        if (emc->errorDetails != NULL) {

            char *text = ossl_sk_ASN1_UTF8STRING2text(emc->errorDetails, ", ",

                OSSL_CMP_PKISI_BUFLEN - 1);

            if (text != NULL && *text != '\0')

                ERR_add_error_data(2, "; errorDetails: ", text);

            OPENSSL_free(text);

        }

        if (ctx->status != OSSL_CMP_PKISTATUS_rejection) {

            ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKISTATUS);

            if (ctx->status == OSSL_CMP_PKISTATUS_waiting)

                ctx->status = OSSL_CMP_PKISTATUS_rejection;

        }

    }

    return 0;

}

/*-

 * When a 'waiting' PKIStatus has been received, this function is used to

 * poll, which should yield a pollRep or the final response.

 * On receiving a pollRep, which includes a checkAfter value, it return this

 * value if sleep == 0, else it sleeps as long as indicated and retries.

 *

 * A transaction timeout is enabled if ctx->total_timeout is != 0.

 * In this case polling will continue until the timeout is reached and then

 * polling is done a last time even if this is before the "checkAfter" time.

 *

 * Returns -1 on receiving pollRep if sleep == 0, setting the checkAfter value.

 * Returns 1 on success and provides the received PKIMESSAGE in *rep.

 *           In this case the caller is responsible for freeing *rep.

 * Returns 0 on error (which includes the cases that timeout has been reached

 *           or a response with 'waiting' status has been received).

 */

static int poll_for_response(OSSL_CMP_CTX *ctx, int sleep, int rid,

    OSSL_CMP_MSG **rep, int *checkAfter)

{

    OSSL_CMP_MSG *preq = NULL;

    OSSL_CMP_MSG *prep = NULL;

    ossl_cmp_info(ctx,

        "received 'waiting' PKIStatus, starting to poll for response");

    *rep = NULL;

    for (;;) {

        if ((preq = ossl_cmp_pollReq_new(ctx, rid)) == NULL)

            goto err;

        if (!send_receive_check(ctx, preq, &prep, OSSL_CMP_PKIBODY_POLLREP))

            goto err;

        /* handle potential pollRep */

        if (OSSL_CMP_MSG_get_bodytype(prep) == OSSL_CMP_PKIBODY_POLLREP) {

            OSSL_CMP_POLLREPCONTENT *prc = prep->body->value.pollRep;

            OSSL_CMP_POLLREP *pollRep = NULL;

            int64_t check_after;

            char str[OSSL_CMP_PKISI_BUFLEN];

            int len;

            if (sk_OSSL_CMP_POLLREP_num(prc) > 1) {

                ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_RESPONSES_NOT_SUPPORTED);

                goto err;

            }

            pollRep = ossl_cmp_pollrepcontent_get0_pollrep(prc, rid);

            if (pollRep == NULL)

                goto err;

            if (!ASN1_INTEGER_get_int64(&check_after, pollRep->checkAfter)) {

                ERR_raise(ERR_LIB_CMP, CMP_R_BAD_CHECKAFTER_IN_POLLREP);

                goto err;

            }

            if (check_after < 0 || (uint64_t)check_after > (sleep ? ULONG_MAX / 1000 : INT_MAX)) {

                ERR_raise(ERR_LIB_CMP, CMP_R_CHECKAFTER_OUT_OF_RANGE);

                if (BIO_snprintf(str, OSSL_CMP_PKISI_BUFLEN, "value = %jd",

                        check_after)

                    >= 0)

                    ERR_add_error_data(1, str);

                goto err;

            }

            if (pollRep->reason == NULL

                || (len = BIO_snprintf(str, OSSL_CMP_PKISI_BUFLEN,

                        " with reason = '"))

                    < 0) {

                *str = '\0';

            } else {

                char *text = ossl_sk_ASN1_UTF8STRING2text(pollRep->reason, ", ",

                    sizeof(str) - len - 2);

                if (text == NULL

                    || BIO_snprintf(str + len, sizeof(str) - len,

                           "%s'", text)

                        < 0)

                    *str = '\0';

                OPENSSL_free(text);

            }

            ossl_cmp_log2(INFO, ctx,

                "received polling response%s; checkAfter = %ld seconds",

                str, check_after);

            if (ctx->total_timeout != 0) { /* timeout is not infinite */

                const int exp = OSSL_CMP_EXPECTED_RESP_TIME;

                int64_t time_left = (int64_t)(ctx->end_time - exp - time(NULL));

                if (time_left <= 0) {

                    ERR_raise(ERR_LIB_CMP, CMP_R_TOTAL_TIMEOUT);

                    goto err;

                }

                if (time_left < check_after)

                    check_after = time_left;

                /* poll one last time just when timeout was reached */

            }

            OSSL_CMP_MSG_free(preq);

            preq = NULL;

            OSSL_CMP_MSG_free(prep);

            prep = NULL;

            if (sleep) {

                OSSL_sleep((unsigned long)(1000 * check_after));

            } else {

                if (checkAfter != NULL)

                    *checkAfter = (int)check_after;

                return -1; /* exits the loop */

            }

        } else if (is_crep_with_waiting(prep, rid)

            || ossl_cmp_is_error_with_waiting(prep)) {

            /* received status must not be 'waiting' */

            (void)ossl_cmp_exchange_error(ctx, OSSL_CMP_PKISTATUS_rejection,

                OSSL_CMP_CTX_FAILINFO_badRequest,

                "polling already started",

                0 /* errorCode */, NULL);

            ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKISTATUS);

            goto err;

        } else {

            ossl_cmp_info(ctx, "received final response after polling");

            if (!ossl_cmp_ctx_set1_first_senderNonce(ctx, NULL))

                goto err;

            break;

        }

    }

    if (prep == NULL)

        goto err;

    OSSL_CMP_MSG_free(preq);

    *rep = prep;

    return 1;

err:

    (void)ossl_cmp_ctx_set1_first_senderNonce(ctx, NULL);

    OSSL_CMP_MSG_free(preq);

    OSSL_CMP_MSG_free(prep);

    return 0;

}

static int save_senderNonce_if_waiting(OSSL_CMP_CTX *ctx,

    const OSSL_CMP_MSG *rep, int rid)

{

    /*

     * Lightweight CMP Profile section 4.4 states: the senderNonce of the

     * preceding request message because this value will be needed for checking

     * the recipNonce of the final response to be received after polling.

     */

    if ((is_crep_with_waiting(rep, rid)

            || ossl_cmp_is_error_with_waiting(rep))

        && !ossl_cmp_ctx_set1_first_senderNonce(ctx, ctx->senderNonce))

        return 0;

    return 1;

}

/*

 * Send request and get response possibly with polling initiated by error msg.

 * Polling for ip/cp/kup/ with 'waiting' status is handled by cert_response().

 */

static int send_receive_also_delayed(OSSL_CMP_CTX *ctx, const OSSL_CMP_MSG *req,

    OSSL_CMP_MSG **rep, int expected_type)

{

    if (!send_receive_check(ctx, req, rep, expected_type))

        return 0;

    if (ossl_cmp_is_error_with_waiting(*rep)) {

        if (!save_senderNonce_if_waiting(ctx, *rep, OSSL_CMP_CERTREQID_NONE))

            return 0;

        /* not modifying ctx->status during certConf and error exchanges */

        if (expected_type != OSSL_CMP_PKIBODY_PKICONF

            && !save_statusInfo(ctx, (*rep)->body->value.error->pKIStatusInfo))

            return 0;

        OSSL_CMP_MSG_free(*rep);

        *rep = NULL;

        if (poll_for_response(ctx, 1 /* can sleep */, OSSL_CMP_CERTREQID_NONE,

                rep, NULL /* checkAfter */)

            <= 0) {

            ERR_raise(ERR_LIB_CMP, CMP_R_POLLING_FAILED);

            return 0;

        }

    }

    if (OSSL_CMP_MSG_get_bodytype(*rep) != expected_type) {

        ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);

        return 0;

    }

    return 1;

}

/*

 * Send certConf for IR, CR or KUR sequences and check response,

 * not modifying ctx->status during the certConf exchange

 */

int ossl_cmp_exchange_certConf(OSSL_CMP_CTX *ctx, int certReqId,

    int fail_info, const char *txt)

{

    OSSL_CMP_MSG *certConf;

    OSSL_CMP_MSG *PKIconf = NULL;

    int res = 0;

    /* OSSL_CMP_certConf_new() also checks if all necessary options are set */

    certConf = ossl_cmp_certConf_new(ctx, certReqId, fail_info, txt);

    if (certConf == NULL)

        goto err;

    res = send_receive_also_delayed(ctx, certConf, &PKIconf,

        OSSL_CMP_PKIBODY_PKICONF);

err:

    OSSL_CMP_MSG_free(certConf);

    OSSL_CMP_MSG_free(PKIconf);

    return res;

}

/* Send given error and check response */

int ossl_cmp_exchange_error(OSSL_CMP_CTX *ctx, int status, int fail_info,

    const char *txt, int errorCode, const char *details)

{

    OSSL_CMP_MSG *error = NULL;

    OSSL_CMP_PKISI *si = NULL;

    OSSL_CMP_MSG *PKIconf = NULL;

    int res = 0;

    /* not overwriting ctx->status on error exchange */

    if ((si = OSSL_CMP_STATUSINFO_new(status, fail_info, txt)) == NULL)

        goto err;

    /* ossl_cmp_error_new() also checks if all necessary options are set */

    if ((error = ossl_cmp_error_new(ctx, si, errorCode, details, 0)) == NULL)

        goto err;

    res = send_receive_also_delayed(ctx, error,

        &PKIconf, OSSL_CMP_PKIBODY_PKICONF);

err:

    OSSL_CMP_MSG_free(error);

    OSSL_CMP_PKISI_free(si);

    OSSL_CMP_MSG_free(PKIconf);

    return res;

}

/*-

 * Retrieve a copy of the certificate, if any, from the given CertResponse.

 * Take into account PKIStatusInfo of CertResponse in ctx, report it on error.

 * Returns NULL if not found or on error.

 */

static X509 *get1_cert_status(OSSL_CMP_CTX *ctx, int bodytype,

    OSSL_CMP_CERTRESPONSE *crep)

{

    char buf[OSSL_CMP_PKISI_BUFLEN];

    X509 *crt = NULL;

    if (!ossl_assert(ctx != NULL && crep != NULL))

        return NULL;

    switch (ossl_cmp_pkisi_get_status(crep->status)) {

    case OSSL_CMP_PKISTATUS_waiting:

        ossl_cmp_err(ctx,

            "received \"waiting\" status for cert when actually aiming to extract cert");

        ERR_raise(ERR_LIB_CMP, CMP_R_ENCOUNTERED_WAITING);

        goto err;

    case OSSL_CMP_PKISTATUS_grantedWithMods:

        ossl_cmp_warn(ctx, "received \"grantedWithMods\" for certificate");

        break;

    case OSSL_CMP_PKISTATUS_accepted:

        break;

        /* get all information in case of a rejection before going to error */

    case OSSL_CMP_PKISTATUS_rejection:

        ossl_cmp_err(ctx, "received \"rejection\" status rather than cert");

        ERR_raise(ERR_LIB_CMP, CMP_R_REQUEST_REJECTED_BY_SERVER);

        goto err;

    case OSSL_CMP_PKISTATUS_revocationWarning:

        ossl_cmp_warn(ctx,

            "received \"revocationWarning\" - a revocation of the cert is imminent");

        break;

    case OSSL_CMP_PKISTATUS_revocationNotification:

        ossl_cmp_warn(ctx,

            "received \"revocationNotification\" - a revocation of the cert has occurred");

        break;

    case OSSL_CMP_PKISTATUS_keyUpdateWarning:

        if (bodytype != OSSL_CMP_PKIBODY_KUR) {

            ERR_raise(ERR_LIB_CMP, CMP_R_ENCOUNTERED_KEYUPDATEWARNING);

            goto err;

        }

        break;

    default:

        ossl_cmp_log1(ERROR, ctx,

            "received unsupported PKIStatus %d for certificate",

            ctx->status);

        ERR_raise(ERR_LIB_CMP, CMP_R_UNKNOWN_PKISTATUS);

        goto err;

    }

    crt = ossl_cmp_certresponse_get1_cert(ctx, crep);

    if (crt == NULL) /* according to PKIStatus, we can expect a cert */

        ERR_raise(ERR_LIB_CMP, CMP_R_CERTIFICATE_NOT_FOUND);

    return crt;

err:

    if (OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf, sizeof(buf)) != NULL)

        ERR_add_error_data(1, buf);

    return NULL;

}

/*-

 * Callback fn validating that the new certificate can be verified, using

 * ctx->certConf_cb_arg, which has been initialized using opt_out_trusted, and

 * ctx->untrusted, which at this point already contains msg->extraCerts.

 * Returns 0 on acceptance, else a bit field reflecting PKIFailureInfo.

 * Quoting from RFC 9810 section 5.1. Overall PKI Message:

 *     The extraCerts field can contain certificates that may be useful to

 *     the recipient.  For example, this can be used by a CA or RA to

 *     present an end entity with certificates that it needs to verify its

 *     own new certificate (for example, if the CA that issued the end

 *     entity's certificate is not a root CA for the end entity).  Note that

 *     this field does not necessarily contain a certification path; the

 *     recipient may have to sort, select from, or otherwise process the

 *     extra certificates in order to use them.

 * Note: While often handy, there is no hard requirement by CMP that

 * an EE must be able to validate the certificates it gets enrolled.

 */

int OSSL_CMP_certConf_cb(OSSL_CMP_CTX *ctx, X509 *cert, int fail_info,

    const char **text)

{

    X509_STORE *out_trusted = OSSL_CMP_CTX_get_certConf_cb_arg(ctx);

    STACK_OF(X509) *chain = NULL;

    (void)text; /* make (artificial) use of var to prevent compiler warning */

    if (fail_info != 0) /* accept any error flagged by CMP core library */

        return fail_info;

    if (out_trusted == NULL) {

        ossl_cmp_debug(ctx, "trying to build chain for newly enrolled cert");

        chain = X509_build_chain(cert, ctx->untrusted, out_trusted,

            0, ctx->libctx, ctx->propq);

    } else {

        X509_STORE_CTX *csc = X509_STORE_CTX_new_ex(ctx->libctx, ctx->propq);

        ossl_cmp_debug(ctx, "validating newly enrolled cert");

        if (csc == NULL)

            goto err;

        if (!X509_STORE_CTX_init(csc, out_trusted, cert, ctx->untrusted))

            goto err;

        /* disable any cert status/revocation checking etc. */

        X509_VERIFY_PARAM_clear_flags(X509_STORE_CTX_get0_param(csc),

            ~(X509_V_FLAG_USE_CHECK_TIME

                | X509_V_FLAG_NO_CHECK_TIME

                | X509_V_FLAG_PARTIAL_CHAIN

                | X509_V_FLAG_POLICY_CHECK));

        if (X509_verify_cert(csc) <= 0)

            goto err;

        if (!ossl_x509_add_certs_new(&chain, X509_STORE_CTX_get0_chain(csc),

                X509_ADD_FLAG_UP_REF | X509_ADD_FLAG_NO_DUP

                    | X509_ADD_FLAG_NO_SS)) {

            sk_X509_free(chain);

            chain = NULL;

        }

    err:

        X509_STORE_CTX_free(csc);

    }

    if (sk_X509_num(chain) > 0)

        X509_free(sk_X509_shift(chain)); /* remove leaf (EE) cert */

    if (out_trusted != NULL) {

        if (chain == NULL) {

            ossl_cmp_err(ctx, "failed to validate newly enrolled cert");

            fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_incorrectData;

        } else {

            ossl_cmp_debug(ctx,

                "success validating newly enrolled cert");

        }

    } else if (chain == NULL) {

        ossl_cmp_warn(ctx, "could not build approximate chain for newly enrolled cert, resorting to received extraCerts");

        chain = OSSL_CMP_CTX_get1_extraCertsIn(ctx);

    } else {

        ossl_cmp_debug(ctx,

            "success building approximate chain for newly enrolled cert");

    }

    (void)ossl_cmp_ctx_set1_newChain(ctx, chain);

    OSSL_STACK_OF_X509_free(chain);

    return fail_info;

}

/*-

 * Perform the generic handling of certificate responses for IR/CR/KUR/P10CR.

 * |rid| must be OSSL_CMP_CERTREQID_NONE if not available, namely for p10cr

 * Returns -1 on receiving pollRep if sleep == 0, setting the checkAfter value.

 * Returns 1 on success and provides the received PKIMESSAGE in *resp.

 * Returns 0 on error (which includes the case that timeout has been reached).

 * Regardless of success, caller is responsible for freeing *resp (unless NULL).

 */

static int cert_response(OSSL_CMP_CTX *ctx, int sleep, int rid,

    OSSL_CMP_MSG **resp, int *checkAfter,

    ossl_unused int req_type,

    ossl_unused int expected_type)

{

    EVP_PKEY *rkey = NULL;

    int fail_info = 0; /* no failure */

    const char *txt = NULL;

    OSSL_CMP_CERTREPMESSAGE *crepmsg = NULL;

    OSSL_CMP_CERTRESPONSE *crep = NULL;

    OSSL_CMP_certConf_cb_t cb;

    X509 *cert;

    char *subj = NULL;

    int ret = 1;

    int rcvd_type;

    OSSL_CMP_PKISI *si;

    if (!ossl_assert(ctx != NULL))

        return 0;

retry:

    rcvd_type = OSSL_CMP_MSG_get_bodytype(*resp);

    if (IS_CREP(rcvd_type)) {

        crepmsg = (*resp)->body->value.ip; /* same for cp and kup */

        if (sk_OSSL_CMP_CERTRESPONSE_num(crepmsg->response) > 1) {

            ERR_raise(ERR_LIB_CMP, CMP_R_MULTIPLE_RESPONSES_NOT_SUPPORTED);

            return 0;

        }

        crep = ossl_cmp_certrepmessage_get0_certresponse(crepmsg, rid);

        if (crep == NULL)

            return 0;

        si = crep->status;

        if (rid == OSSL_CMP_CERTREQID_NONE) {

            /* for OSSL_CMP_PKIBODY_P10CR learn CertReqId from response */

            rid = ossl_cmp_asn1_get_int(crep->certReqId);

            if (rid < OSSL_CMP_CERTREQID_NONE) {

                ERR_raise(ERR_LIB_CMP, CMP_R_BAD_REQUEST_ID);

                return 0;

            }

        }

    } else if (rcvd_type == OSSL_CMP_PKIBODY_ERROR) {

        si = (*resp)->body->value.error->pKIStatusInfo;

    } else {

        ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);

        return 0;

    }

    if (!save_statusInfo(ctx, si))

        return 0;

    if (ossl_cmp_pkisi_get_status(si) == OSSL_CMP_PKISTATUS_waiting) {

        /*

         * Here we allow both and error message with waiting indication

         * as well as a certificate response with waiting indication, where

         * its flavor (ip, cp, or kup) may not strictly match ir/cr/p10cr/kur.

         */

        OSSL_CMP_MSG_free(*resp);

        *resp = NULL;

        if ((ret = poll_for_response(ctx, sleep, rid, resp, checkAfter)) != 0) {

            if (ret == -1) /* at this point implies sleep == 0 */

                return ret; /* waiting */

            goto retry; /* got some response other than pollRep */

        } else {

            ERR_raise(ERR_LIB_CMP, CMP_R_POLLING_FAILED);

            return 0;

        }

    }

    /* at this point, we have received ip/cp/kup/error without waiting */

    if (rcvd_type == OSSL_CMP_PKIBODY_ERROR) {

        ERR_raise(ERR_LIB_CMP, CMP_R_RECEIVED_ERROR);

        return 0;

    }

    /* here we are strict on the flavor of ip/cp/kup: must match request */

    if (rcvd_type != expected_type) {

        ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKIBODY);

        return 0;

    }

    cert = get1_cert_status(ctx, (*resp)->body->type, crep);

    if (cert == NULL) {

        ERR_add_error_data(1, "; cannot extract certificate from response");

        return 0;

    }

    if (!ossl_cmp_ctx_set0_newCert(ctx, cert)) {

        X509_free(cert);

        return 0;

    }

    /*

     * if the CMP server returned certificates in the caPubs field, copy them

     * to the context so that they can be retrieved if necessary

     */

    if (crepmsg != NULL && crepmsg->caPubs != NULL

        && !ossl_cmp_ctx_set1_caPubs(ctx, crepmsg->caPubs))

        return 0;

    subj = X509_NAME_oneline(X509_get_subject_name(cert), NULL, 0);

    rkey = ossl_cmp_ctx_get0_newPubkey(ctx);

    if (rkey != NULL

        /* X509_check_private_key() also works if rkey is just public key */

        && !(X509_check_private_key(ctx->newCert, rkey))) {

        fail_info = 1 << OSSL_CMP_PKIFAILUREINFO_incorrectData;

        txt = "public key in new certificate does not match our enrollment key";

        /*-

         * not calling (void)ossl_cmp_exchange_error(ctx,

         *                   OSSL_CMP_PKISTATUS_rejection, fail_info, txt)

         * not throwing CMP_R_CERTIFICATE_NOT_ACCEPTED with txt

         * not returning 0

         * since we better leave this for the certConf_cb to decide

         */

    }

    /*

     * Execute the certification checking callback function,

     * which can determine whether to accept a newly enrolled certificate.

     * It may overrule the pre-decision reflected in 'fail_info' and '*txt'.

     */

    cb = ctx->certConf_cb != NULL ? ctx->certConf_cb : OSSL_CMP_certConf_cb;

    if ((fail_info = cb(ctx, ctx->newCert, fail_info, &txt)) != 0

        && txt == NULL)

        txt = "CMP client did not accept it";

    if (fail_info != 0) /* immediately log error before any certConf exchange */

        ossl_cmp_log1(ERROR, ctx,

            "rejecting newly enrolled cert with subject: %s", subj);

    /*

     * certConf exchange should better be moved to do_certreq_seq() such that

     * also more low-level errors with CertReqMessages get reported to server

     */

    if (!ctx->disableConfirm

        && !ossl_cmp_hdr_has_implicitConfirm((*resp)->header)) {

        if (!ossl_cmp_exchange_certConf(ctx, rid, fail_info, txt))

            ret = 0;

    }

    /* not throwing failure earlier as transfer_cb may call ERR_clear_error() */

    if (fail_info != 0) {

        ERR_raise_data(ERR_LIB_CMP, CMP_R_CERTIFICATE_NOT_ACCEPTED,

            "rejecting newly enrolled cert with subject: %s; %s",

            subj, txt);

        ctx->status = OSSL_CMP_PKISTATUS_rejection;

        ret = 0;

    }

    OPENSSL_free(subj);

    return ret;

}

static int initial_certreq(OSSL_CMP_CTX *ctx,

    int req_type, const OSSL_CRMF_MSG *crm,

    OSSL_CMP_MSG **p_rep, int rep_type)

{

    OSSL_CMP_MSG *req;

    int res;

    ctx->status = OSSL_CMP_PKISTATUS_request;

    if (!ossl_cmp_ctx_set0_newCert(ctx, NULL))

        return 0;

    /* also checks if all necessary options are set */

    if ((req = ossl_cmp_certreq_new(ctx, req_type, crm)) == NULL)

        return 0;

    ctx->status = OSSL_CMP_PKISTATUS_trans;

    res = send_receive_check(ctx, req, p_rep, rep_type);

    OSSL_CMP_MSG_free(req);

    return res;

}

int OSSL_CMP_try_certreq(OSSL_CMP_CTX *ctx, int req_type,

    const OSSL_CRMF_MSG *crm, int *checkAfter)

{

    OSSL_CMP_MSG *rep = NULL;

    int is_p10 = req_type == OSSL_CMP_PKIBODY_P10CR;

    int rid = is_p10 ? OSSL_CMP_CERTREQID_NONE : OSSL_CMP_CERTREQID;

    int rep_type = is_p10 ? OSSL_CMP_PKIBODY_CP : req_type + 1;

    int res = 0;

    if (ctx == NULL) {

        ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);

        return 0;

    }

    if (ctx->status != OSSL_CMP_PKISTATUS_waiting) { /* not polling already */

        if (!initial_certreq(ctx, req_type, crm, &rep, rep_type))

            goto err;

        if (!save_senderNonce_if_waiting(ctx, rep, rid))

            goto err;

    } else {

        if (req_type < 0)

            return ossl_cmp_exchange_error(ctx, OSSL_CMP_PKISTATUS_rejection,

                0, "polling aborted",

                0 /* errorCode */, "by application");

        res = poll_for_response(ctx, 0 /* no sleep */, rid, &rep, checkAfter);

        if (res <= 0) /* waiting or error */

            return res;

    }

    res = cert_response(ctx, 0 /* no sleep */, rid, &rep, checkAfter,

        req_type, rep_type);

err:

    OSSL_CMP_MSG_free(rep);

    return res;

}

/*-

 * Do the full sequence CR/IR/KUR/P10CR, CP/IP/KUP/CP,

 * certConf, PKIconf, and polling if required.

 * Will sleep as long as indicated by the server (according to checkAfter).

 * All enrollment options need to be present in the context.

 * Returns pointer to received certificate, or NULL if none was received.

 */

X509 *OSSL_CMP_exec_certreq(OSSL_CMP_CTX *ctx, int req_type,