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.\" ========================================================================
.\"
.IX Title "OSSL_CMP_validate_msg 3"
.TH OSSL_CMP_validate_msg 3 "2023-05-07" "3.0.9" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.nh
.SH "NAME"
OSSL_CMP_validate_msg,
OSSL_CMP_validate_cert_path
\&\- functions for verifying CMP message protection
.SH "LIBRARY"
libcrypto, -lcrypto
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\& #include <openssl/cmp.h>
\& int OSSL_CMP_validate_msg(OSSL_CMP_CTX *ctx, OSSL_CMP_MSG *msg);
\& int OSSL_CMP_validate_cert_path(const OSSL_CMP_CTX *ctx,
\&                                 X509_STORE *trusted_store, X509 *cert);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This is the \s-1API\s0 for validating the protection of \s-1CMP\s0 messages,
which includes validating \s-1CMP\s0 message sender certificates and their paths
while optionally checking the revocation status of the certificates(s).
.PP
\&\fBOSSL_CMP_validate_msg()\fR validates the protection of the given \fImsg\fR,
which must be signature-based or using password-based \s-1MAC\s0 (\s-1PBM\s0).
In the former case a suitable trust anchor must be given in the \s-1CMP\s0 context
\&\fIctx\fR, and in the latter case the matching secret must have been set there
using \fBOSSL_CMP_CTX_set1_secretValue\fR\|(3).
.PP
In case of signature algorithm, the certificate to use for the signature check
is preferably the one provided by a call to \fBOSSL_CMP_CTX_set1_srvCert\fR\|(3).
If no such sender cert has been pinned then candidate sender certificates are
taken from the list of certificates received in the \fImsg\fR extraCerts, then any
certificates provided before via \fBOSSL_CMP_CTX_set1_untrusted\fR\|(3), and
then all trusted certificates provided via \fBOSSL_CMP_CTX_set0_trustedStore\fR\|(3),
where a candidate is acceptable only if has not expired, its subject \s-1DN\s0 matches
the \fImsg\fR sender \s-1DN\s0 (as far as present), and its subject key identifier
is present and matches the senderKID (as far as the latter present).
Each acceptable cert is tried in the given order to see if the message
signature check succeeds and the cert and its path can be verified
using any trust store set via \fBOSSL_CMP_CTX_set0_trustedStore\fR\|(3).
.PP
If the option \s-1OSSL_CMP_OPT_PERMIT_TA_IN_EXTRACERTS_FOR_IR\s0 was set by calling
\&\fBOSSL_CMP_CTX_set_option\fR\|(3), for an Initialization Response (\s-1IP\s0) message
any self-issued certificate from the \fImsg\fR extraCerts field may also be used
as trust anchor for the path verification of an acceptable cert if it can be
used also to validate the issued certificate returned in the \s-1IP\s0 message. This is
according to \s-1TS 33.310\s0 [Network Domain Security (\s-1NDS\s0); Authentication Framework
(\s-1AF\s0)] document specified by the The 3rd Generation Partnership Project (3GPP).
.PP
Any cert that has been found as described above is cached and tried first when
validating the signatures of subsequent messages in the same transaction.
.PP
\&\fBOSSL_CMP_validate_cert_path()\fR attempts to validate the given certificate and its
path using the given store of trusted certs (possibly including CRLs and a cert
verification callback) and non-trusted intermediate certs from the \fIctx\fR.
.SH "NOTES"
.IX Header "NOTES"
\&\s-1CMP\s0 is defined in \s-1RFC 4210\s0 (and \s-1CRMF\s0 in \s-1RFC 4211\s0).
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBOSSL_CMP_validate_msg()\fR and \fBOSSL_CMP_validate_cert_path()\fR
return 1 on success, 0 on error or validation failed.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBOSSL_CMP_CTX_new\fR\|(3), \fBOSSL_CMP_exec_certreq\fR\|(3),
\&\fBOSSL_CMP_CTX_set1_secretValue\fR\|(3), \fBOSSL_CMP_CTX_set1_srvCert\fR\|(3),
\&\fBOSSL_CMP_CTX_set1_untrusted\fR\|(3), \fBOSSL_CMP_CTX_set0_trustedStore\fR\|(3)
.SH "HISTORY"
.IX Header "HISTORY"
The OpenSSL \s-1CMP\s0 support was added in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2007\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R").  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.