226 lines
8.0 KiB
Groff
Executable File
226 lines
8.0 KiB
Groff
Executable File
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.\" ========================================================================
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.\"
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.IX Title "CT_POLICY_EVAL_CTX_NEW 3"
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.TH CT_POLICY_EVAL_CTX_NEW 3 "2020-03-02" "3.0.0-dev" "OpenSSL"
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.\" For nroff, turn off justification. Always turn off hyphenation; it makes
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.\" way too many mistakes in technical documents.
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.if n .ad l
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.nh
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.SH "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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.SH "SYNOPSIS"
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.IX Header "SYNOPSIS"
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.Vb 1
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\& #include <openssl/ct.h>
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\&
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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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.Ve
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.SH "DESCRIPTION"
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.IX Header "DESCRIPTION"
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A \fB\s-1CT_POLICY_EVAL_CTX\s0\fR is used by functions that evaluate whether Signed
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Certificate Timestamps (SCTs) fulfil a Certificate Transparency (\s-1CT\s0) policy.
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This policy may be, for example, that at least one valid \s-1SCT\s0 is available. To
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determine this, an \s-1SCT\s0's timestamp and signature must be verified.
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This requires:
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.IP "\(bu" 2
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the public key of the log that issued the \s-1SCT\s0
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.IP "\(bu" 2
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the certificate that the \s-1SCT\s0 was issued for
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.IP "\(bu" 2
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the issuer certificate (if the \s-1SCT\s0 was issued for a pre-certificate)
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.IP "\(bu" 2
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the current time
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.PP
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The above requirements are met using the setters described below.
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.PP
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\&\fICT_POLICY_EVAL_CTX_new()\fR creates an empty policy evaluation context. This
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should then be populated using:
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.IP "\(bu" 2
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\&\fICT_POLICY_EVAL_CTX_set1_cert()\fR to provide the certificate the SCTs were issued for
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.Sp
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Increments the reference count of the certificate.
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.IP "\(bu" 2
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\&\fICT_POLICY_EVAL_CTX_set1_issuer()\fR to provide the issuer certificate
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.Sp
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Increments the reference count of the certificate.
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.IP "\(bu" 2
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\&\fICT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE()\fR to provide a list of logs that are trusted as sources of SCTs
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.Sp
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Holds a pointer to the \s-1CTLOG_STORE\s0, so the \s-1CTLOG_STORE\s0 must outlive the
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\&\s-1CT_POLICY_EVAL_CTX\s0.
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.IP "\(bu" 2
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\&\fICT_POLICY_EVAL_CTX_set_time()\fR to set the time SCTs should be compared with to determine if they are valid
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.Sp
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The \s-1SCT\s0 timestamp will be compared to this time to check whether the \s-1SCT\s0 was
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issued in the future. \s-1RFC6962\s0 states that \*(L"\s-1TLS\s0 clients \s-1MUST\s0 reject SCTs whose
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timestamp is in the future\*(R". By default, this will be set to 5 minutes in the
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future (e.g. (\fItime()\fR + 300) * 1000), to allow for clock drift.
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.Sp
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The time should be in milliseconds since the Unix Epoch.
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.PP
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Each setter has a matching getter for accessing the current value.
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.PP
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When no longer required, the \fB\s-1CT_POLICY_EVAL_CTX\s0\fR should be passed to
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\&\fICT_POLICY_EVAL_CTX_free()\fR to delete it.
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.SH "NOTES"
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.IX Header "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 \s-1TLS\s0 \s-1SCT\s0 extension or \s-1OCSP\s0 response.
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.SH "RETURN VALUES"
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.IX Header "RETURN VALUES"
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\&\fICT_POLICY_EVAL_CTX_new()\fR will return \s-1NULL\s0 if malloc fails.
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.SH "SEE ALSO"
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.IX Header "SEE ALSO"
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\&\fIct\fR\|(7)
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.SH "HISTORY"
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.IX Header "HISTORY"
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These functions were added in OpenSSL 1.1.0.
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.SH "COPYRIGHT"
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.IX Header "COPYRIGHT"
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Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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.PP
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Licensed under the Apache License 2.0 (the \*(L"License\*(R"). 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 \s-1LICENSE\s0 in the source distribution or at
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<https://www.openssl.org/source/license.html>.
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