1CT_POLICY_EVAL_CTX_NEW(3)           OpenSSL          CT_POLICY_EVAL_CTX_NEW(3)
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NAME

6       CT_POLICY_EVAL_CTX_new, CT_POLICY_EVAL_CTX_free,
7       CT_POLICY_EVAL_CTX_get0_cert, CT_POLICY_EVAL_CTX_set1_cert,
8       CT_POLICY_EVAL_CTX_get0_issuer, CT_POLICY_EVAL_CTX_set1_issuer,
9       CT_POLICY_EVAL_CTX_get0_log_store,
10       CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE, CT_POLICY_EVAL_CTX_get_time,
11       CT_POLICY_EVAL_CTX_set_time - Encapsulates the data required to
12       evaluate whether SCTs meet a Certificate Transparency policy
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SYNOPSIS

15        #include <openssl/ct.h>
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17        CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);
18        void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);
19        X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);
20        int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);
21        X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);
22        int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);
23        const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);
24        void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
25                                                       CTLOG_STORE *log_store);
26        uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx);
27        void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms);
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DESCRIPTION

30       A CT_POLICY_EVAL_CTX is used by functions that evaluate whether Signed
31       Certificate Timestamps (SCTs) fulfil a Certificate Transparency (CT)
32       policy.  This policy may be, for example, that at least one valid SCT
33       is available. To determine this, an SCT's timestamp and signature must
34       be verified.  This requires:
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36       • the public key of the log that issued the SCT
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38       • the certificate that the SCT was issued for
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40       • the issuer certificate (if the SCT was issued for a pre-certificate)
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42       • the current time
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44       The above requirements are met using the setters described below.
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46       CT_POLICY_EVAL_CTX_new() creates an empty policy evaluation context.
47       This should then be populated using:
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49       • CT_POLICY_EVAL_CTX_set1_cert() to provide the certificate the SCTs
50         were issued for
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52         Increments the reference count of the certificate.
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54       • CT_POLICY_EVAL_CTX_set1_issuer() to provide the issuer certificate
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56         Increments the reference count of the certificate.
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58       • CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE() to provide a list of logs
59         that are trusted as sources of SCTs
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61         Holds a pointer to the CTLOG_STORE, so the CTLOG_STORE must outlive
62         the CT_POLICY_EVAL_CTX.
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64       • CT_POLICY_EVAL_CTX_set_time() to set the time SCTs should be compared
65         with to determine if they are valid
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67         The SCT timestamp will be compared to this time to check whether the
68         SCT was issued in the future. RFC6962 states that "TLS clients MUST
69         reject SCTs whose timestamp is in the future". By default, this will
70         be set to 5 minutes in the future (e.g. (time() + 300) * 1000), to
71         allow for clock drift.
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73         The time should be in milliseconds since the Unix epoch.
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75       Each setter has a matching getter for accessing the current value.
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77       When no longer required, the CT_POLICY_EVAL_CTX should be passed to
78       CT_POLICY_EVAL_CTX_free() to delete it.
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NOTES

81       The issuer certificate only needs to be provided if at least one of the
82       SCTs was issued for a pre-certificate. This will be the case for SCTs
83       embedded in a certificate (i.e. those in an X.509 extension), but may
84       not be the case for SCTs found in the TLS SCT extension or OCSP
85       response.
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RETURN VALUES

88       CT_POLICY_EVAL_CTX_new() will return NULL if malloc fails.
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SEE ALSO

91       ct(7)
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HISTORY

94       These functions were added in OpenSSL 1.1.0.
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97       Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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99       Licensed under the OpenSSL license (the "License").  You may not use
100       this file except in compliance with the License.  You can obtain a copy
101       in the file LICENSE in the source distribution or at
102       <https://www.openssl.org/source/license.html>.
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1061.1.1i                            2021-07-22         CT_POLICY_EVAL_CTX_NEW(3)
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