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openssl/crypto/cmp/cmp_client.c

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/*
* Copyright 2007-2024 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);
if (!sk_ASN1_UTF8STRING_push(ctx->statusString, ASN1_STRING_dup(str)))
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))
return 0;
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 4210 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 (if, for example, 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 = ossl_cmp_ctx_get0_newPubkey(ctx);
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))
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);
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))
return 0;
} 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,
const OSSL_CRMF_MSG *crm)
{
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;
X509 *result = NULL;
if (ctx == NULL) {
ERR_raise(ERR_LIB_CMP, CMP_R_NULL_ARGUMENT);
return NULL;
}
if (!initial_certreq(ctx, req_type, crm, &rep, rep_type))
goto err;
if (!save_senderNonce_if_waiting(ctx, rep, rid))
return 0;
if (cert_response(ctx, 1 /* sleep */, rid, &rep, NULL, req_type, rep_type)
<= 0)
goto err;
result = ctx->newCert;
err:
OSSL_CMP_MSG_free(rep);
return result;
}
int OSSL_CMP_exec_RR_ses(OSSL_CMP_CTX *ctx)
{
OSSL_CMP_MSG *rr = NULL;
OSSL_CMP_MSG *rp = NULL;
const int num_RevDetails = 1;
const int rsid = OSSL_CMP_REVREQSID;
OSSL_CMP_REVREPCONTENT *rrep = NULL;
OSSL_CMP_PKISI *si = NULL;
char buf[OSSL_CMP_PKISI_BUFLEN];
int ret = 0;
if (ctx == NULL) {
ERR_raise(ERR_LIB_CMP, CMP_R_INVALID_ARGS);
return 0;
}
ctx->status = OSSL_CMP_PKISTATUS_request;
if (ctx->oldCert == NULL && ctx->p10CSR == NULL
&& (ctx->serialNumber == NULL || ctx->issuer == NULL)) {
ERR_raise(ERR_LIB_CMP, CMP_R_MISSING_REFERENCE_CERT);
return 0;
}
/* OSSL_CMP_rr_new() also checks if all necessary options are set */
if ((rr = ossl_cmp_rr_new(ctx)) == NULL)
goto end;
ctx->status = OSSL_CMP_PKISTATUS_trans;
if (!send_receive_also_delayed(ctx, rr, &rp, OSSL_CMP_PKIBODY_RP))
goto end;
rrep = rp->body->value.rp;
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
if (sk_OSSL_CMP_PKISI_num(rrep->status) != num_RevDetails) {
ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
goto end;
}
#else
if (sk_OSSL_CMP_PKISI_num(rrep->status) < 1) {
ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
goto end;
}
#endif
/* evaluate PKIStatus field */
si = ossl_cmp_revrepcontent_get_pkisi(rrep, rsid);
if (!save_statusInfo(ctx, si))
goto err;
switch (ossl_cmp_pkisi_get_status(si)) {
case OSSL_CMP_PKISTATUS_accepted:
ossl_cmp_info(ctx, "revocation accepted (PKIStatus=accepted)");
ret = 1;
break;
case OSSL_CMP_PKISTATUS_grantedWithMods:
ossl_cmp_info(ctx, "revocation accepted (PKIStatus=grantedWithMods)");
ret = 1;
break;
case OSSL_CMP_PKISTATUS_rejection:
ERR_raise(ERR_LIB_CMP, CMP_R_REQUEST_REJECTED_BY_SERVER);
goto err;
case OSSL_CMP_PKISTATUS_revocationWarning:
ossl_cmp_info(ctx, "revocation accepted (PKIStatus=revocationWarning)");
ret = 1;
break;
case OSSL_CMP_PKISTATUS_revocationNotification:
/* interpretation as warning or error depends on CA */
ossl_cmp_warn(ctx,
"revocation accepted (PKIStatus=revocationNotification)");
ret = 1;
break;
case OSSL_CMP_PKISTATUS_waiting:
case OSSL_CMP_PKISTATUS_keyUpdateWarning:
ERR_raise(ERR_LIB_CMP, CMP_R_UNEXPECTED_PKISTATUS);
goto err;
default:
ERR_raise(ERR_LIB_CMP, CMP_R_UNKNOWN_PKISTATUS);
goto err;
}
/* check any present CertId in optional revCerts field */
if (sk_OSSL_CRMF_CERTID_num(rrep->revCerts) >= 1) {
OSSL_CRMF_CERTID *cid;
OSSL_CRMF_CERTTEMPLATE *tmpl =
sk_OSSL_CMP_REVDETAILS_value(rr->body->value.rr, rsid)->certDetails;
const X509_NAME *issuer = OSSL_CRMF_CERTTEMPLATE_get0_issuer(tmpl);
const ASN1_INTEGER *serial =
OSSL_CRMF_CERTTEMPLATE_get0_serialNumber(tmpl);
if (sk_OSSL_CRMF_CERTID_num(rrep->revCerts) != num_RevDetails) {
ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
ret = 0;
goto err;
}
if ((cid = ossl_cmp_revrepcontent_get_CertId(rrep, rsid)) == NULL) {
ERR_raise(ERR_LIB_CMP, CMP_R_MISSING_CERTID);
ret = 0;
goto err;
}
if (X509_NAME_cmp(issuer, OSSL_CRMF_CERTID_get0_issuer(cid)) != 0) {
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_CERTID_IN_RP);
ret = 0;
goto err;
#endif
}
if (ASN1_INTEGER_cmp(serial,
OSSL_CRMF_CERTID_get0_serialNumber(cid)) != 0) {
#ifndef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION
ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_SERIAL_IN_RP);
ret = 0;
goto err;
#endif
}
}
/* check number of any optionally present crls */
if (rrep->crls != NULL && sk_X509_CRL_num(rrep->crls) != num_RevDetails) {
ERR_raise(ERR_LIB_CMP, CMP_R_WRONG_RP_COMPONENT_COUNT);
ret = 0;
goto err;
}
err:
if (ret == 0
&& OSSL_CMP_CTX_snprint_PKIStatus(ctx, buf, sizeof(buf)) != NULL)
ERR_add_error_data(1, buf);
end:
OSSL_CMP_MSG_free(rr);
OSSL_CMP_MSG_free(rp);
return ret;
}
STACK_OF(OSSL_CMP_ITAV) *OSSL_CMP_exec_GENM_ses(OSSL_CMP_CTX *ctx)
{
OSSL_CMP_MSG *genm;
OSSL_CMP_MSG *genp = NULL;
STACK_OF(OSSL_CMP_ITAV) *itavs = NULL;
if (ctx == NULL) {
ERR_raise(ERR_LIB_CMP, CMP_R_INVALID_ARGS);
return NULL;
}
ctx->status = OSSL_CMP_PKISTATUS_request;
if ((genm = ossl_cmp_genm_new(ctx)) == NULL)
goto err;
ctx->status = OSSL_CMP_PKISTATUS_trans;
if (!send_receive_also_delayed(ctx, genm, &genp, OSSL_CMP_PKIBODY_GENP))
goto err;
ctx->status = OSSL_CMP_PKISTATUS_accepted;
itavs = genp->body->value.genp;
if (itavs == NULL)
itavs = sk_OSSL_CMP_ITAV_new_null();
/* received stack of itavs not to be freed with the genp */
genp->body->value.genp = NULL;
err:
OSSL_CMP_MSG_free(genm);
OSSL_CMP_MSG_free(genp);
return itavs; /* NULL indicates error case */
}
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