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.\" ========================================================================
.\"
.IX Title "CT_POLICY_EVAL_CTX_NEW 3"
.TH CT_POLICY_EVAL_CTX_NEW 3 "2023-09-11" "1.1.1w" "OpenSSL"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
CT_POLICY_EVAL_CTX_new, CT_POLICY_EVAL_CTX_free, CT_POLICY_EVAL_CTX_get0_cert, CT_POLICY_EVAL_CTX_set1_cert, CT_POLICY_EVAL_CTX_get0_issuer, CT_POLICY_EVAL_CTX_set1_issuer, CT_POLICY_EVAL_CTX_get0_log_store, CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE, CT_POLICY_EVAL_CTX_get_time, CT_POLICY_EVAL_CTX_set_time \- Encapsulates the data required to evaluate whether SCTs meet a Certificate Transparency policy
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/ct.h>
\&
\& CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);
\& void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);
\& X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);
\& int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);
\& X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);
\& int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);
\& const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);
\& void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
\&                                                CTLOG_STORE *log_store);
\& uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx);
\& void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
A \fB\s-1CT_POLICY_EVAL_CTX\s0\fR is used by functions that evaluate whether Signed
Certificate Timestamps (SCTs) fulfil a Certificate Transparency (\s-1CT\s0) policy.
This policy may be, for example, that at least one valid \s-1SCT\s0 is available. To
determine this, an \s-1SCT\s0's timestamp and signature must be verified.
This requires:
.IP "\(bu" 2
the public key of the log that issued the \s-1SCT\s0
.IP "\(bu" 2
the certificate that the \s-1SCT\s0 was issued for
.IP "\(bu" 2
the issuer certificate (if the \s-1SCT\s0 was issued for a pre-certificate)
.IP "\(bu" 2
the current time
.PP
The above requirements are met using the setters described below.
.PP
\&\fBCT_POLICY_EVAL_CTX_new()\fR creates an empty policy evaluation context. This
should then be populated using:
.IP "\(bu" 2
\&\fBCT_POLICY_EVAL_CTX_set1_cert()\fR to provide the certificate the SCTs were issued for
.Sp
Increments the reference count of the certificate.
.IP "\(bu" 2
\&\fBCT_POLICY_EVAL_CTX_set1_issuer()\fR to provide the issuer certificate
.Sp
Increments the reference count of the certificate.
.IP "\(bu" 2
\&\fBCT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE()\fR to provide a list of logs that are trusted as sources of SCTs
.Sp
Holds a pointer to the \s-1CTLOG_STORE,\s0 so the \s-1CTLOG_STORE\s0 must outlive the
\&\s-1CT_POLICY_EVAL_CTX.\s0
.IP "\(bu" 2
\&\fBCT_POLICY_EVAL_CTX_set_time()\fR to set the time SCTs should be compared with to determine if they are valid
.Sp
The \s-1SCT\s0 timestamp will be compared to this time to check whether the \s-1SCT\s0 was
issued in the future. \s-1RFC6962\s0 states that \*(L"\s-1TLS\s0 clients \s-1MUST\s0 reject SCTs whose
timestamp is in the future\*(R". By default, this will be set to 5 minutes in the
future (e.g. (\fBtime()\fR + 300) * 1000), to allow for clock drift.
.Sp
The time should be in milliseconds since the Unix epoch.
.PP
Each setter has a matching getter for accessing the current value.
.PP
When no longer required, the \fB\s-1CT_POLICY_EVAL_CTX\s0\fR should be passed to
\&\fBCT_POLICY_EVAL_CTX_free()\fR to delete it.
.SH "NOTES"
.IX Header "NOTES"
The issuer certificate only needs to be provided if at least one of the SCTs
was issued for a pre-certificate. This will be the case for SCTs embedded in a
certificate (i.e. those in an X.509 extension), but may not be the case for SCTs
found in the \s-1TLS SCT\s0 extension or \s-1OCSP\s0 response.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBCT_POLICY_EVAL_CTX_new()\fR will return \s-1NULL\s0 if malloc fails.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBct\fR\|(7)
.SH "HISTORY"
.IX Header "HISTORY"
These functions were added in OpenSSL 1.1.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.

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