4746f25ac6
[skip ci] Reviewed-by: Matt Caswell <matt@openssl.org> (Merged from https://github.com/openssl/openssl/pull/7829)
128 lines
3.8 KiB
Text
128 lines
3.8 KiB
Text
=pod
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=head1 NAME
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CT_POLICY_EVAL_CTX_new, CT_POLICY_EVAL_CTX_free,
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CT_POLICY_EVAL_CTX_get0_cert, CT_POLICY_EVAL_CTX_set1_cert,
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CT_POLICY_EVAL_CTX_get0_issuer, CT_POLICY_EVAL_CTX_set1_issuer,
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CT_POLICY_EVAL_CTX_get0_log_store, CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE,
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CT_POLICY_EVAL_CTX_get_time, CT_POLICY_EVAL_CTX_set_time -
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Encapsulates the data required to evaluate whether SCTs meet a Certificate Transparency policy
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=head1 SYNOPSIS
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#include <openssl/ct.h>
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CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);
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void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);
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X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);
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int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);
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X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);
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int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);
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const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);
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void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
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CTLOG_STORE *log_store);
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uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx);
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void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms);
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=head1 DESCRIPTION
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A B<CT_POLICY_EVAL_CTX> is used by functions that evaluate whether Signed
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Certificate Timestamps (SCTs) fulfil a Certificate Transparency (CT) policy.
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This policy may be, for example, that at least one valid SCT is available. To
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determine this, an SCT's timestamp and signature must be verified.
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This requires:
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=over 2
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=item *
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the public key of the log that issued the SCT
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=item *
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the certificate that the SCT was issued for
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=item *
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the issuer certificate (if the SCT was issued for a pre-certificate)
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=item *
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the current time
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=back
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The above requirements are met using the setters described below.
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CT_POLICY_EVAL_CTX_new() creates an empty policy evaluation context. This
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should then be populated using:
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=over 2
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=item *
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CT_POLICY_EVAL_CTX_set1_cert() to provide the certificate the SCTs were issued for
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Increments the reference count of the certificate.
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=item *
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CT_POLICY_EVAL_CTX_set1_issuer() to provide the issuer certificate
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Increments the reference count of the certificate.
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=item *
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CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE() to provide a list of logs that are trusted as sources of SCTs
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Holds a pointer to the CTLOG_STORE, so the CTLOG_STORE must outlive the
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CT_POLICY_EVAL_CTX.
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=item *
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CT_POLICY_EVAL_CTX_set_time() to set the time SCTs should be compared with to determine if they are valid
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The SCT timestamp will be compared to this time to check whether the SCT was
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issued in the future. RFC6962 states that "TLS clients MUST reject SCTs whose
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timestamp is in the future". By default, this will be set to 5 minutes in the
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future (e.g. (time() + 300) * 1000), to allow for clock drift.
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The time should be in milliseconds since the Unix epoch.
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=back
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Each setter has a matching getter for accessing the current value.
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When no longer required, the B<CT_POLICY_EVAL_CTX> should be passed to
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CT_POLICY_EVAL_CTX_free() to delete it.
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=head1 NOTES
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The issuer certificate only needs to be provided if at least one of the SCTs
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was issued for a pre-certificate. This will be the case for SCTs embedded in a
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certificate (i.e. those in an X.509 extension), but may not be the case for SCTs
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found in the TLS SCT extension or OCSP response.
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=head1 RETURN VALUES
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CT_POLICY_EVAL_CTX_new() will return NULL if malloc fails.
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=head1 SEE ALSO
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L<ct(7)>
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=head1 HISTORY
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These functions were added in OpenSSL 1.1.0.
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=head1 COPYRIGHT
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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