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/*
* Public API for Certificate Transparency (CT).
* Written by Rob Percival (robpercival@google.com) for the OpenSSL project.
*/
/* ====================================================================
* Copyright (c) 2016 The OpenSSL Project. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. All advertising materials mentioning features or use of this
* software must display the following acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
*
* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
* endorse or promote products derived from this software without
* prior written permission. For written permission, please contact
* licensing@OpenSSL.org.
*
* 5. Products derived from this software may not be called "OpenSSL"
* nor may "OpenSSL" appear in their names without prior written
* permission of the OpenSSL Project.
*
* 6. Redistributions of any form whatsoever must retain the following
* acknowledgment:
* "This product includes software developed by the OpenSSL Project
* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
*
* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*/
#ifndef HEADER_CT_H
# define HEADER_CT_H
# include <openssl/opensslconf.h>
# ifndef OPENSSL_NO_CT
# include <openssl/ossl_typ.h>
# include <openssl/safestack.h>
# include <openssl/x509.h>
# ifdef __cplusplus
extern "C" {
# endif
/* Minimum RSA key size, from RFC6962 */
# define SCT_MIN_RSA_BITS 2048
/* All hashes are SHA256 in v1 of Certificate Transparency */
# define CT_V1_HASHLEN SHA256_DIGEST_LENGTH
typedef enum {
CT_LOG_ENTRY_TYPE_NOT_SET = -1,
CT_LOG_ENTRY_TYPE_X509 = 0,
CT_LOG_ENTRY_TYPE_PRECERT = 1
} ct_log_entry_type_t;
typedef enum {
SCT_VERSION_NOT_SET = -1,
SCT_VERSION_V1 = 0
} sct_version_t;
typedef enum {
SCT_SOURCE_UNKNOWN,
SCT_SOURCE_TLS_EXTENSION,
SCT_SOURCE_X509V3_EXTENSION,
SCT_SOURCE_OCSP_STAPLED_RESPONSE
} sct_source_t;
typedef enum {
SCT_VALIDATION_STATUS_NOT_SET,
SCT_VALIDATION_STATUS_UNKNOWN_LOG,
SCT_VALIDATION_STATUS_VALID,
SCT_VALIDATION_STATUS_INVALID,
SCT_VALIDATION_STATUS_UNVERIFIED,
SCT_VALIDATION_STATUS_UNKNOWN_VERSION
} sct_validation_status_t;
DEFINE_STACK_OF(SCT)
DEFINE_STACK_OF(CTLOG)
/******************************************
* CT policy evaluation context functions *
******************************************/
/* Creates a new, empty policy evaluation context */
CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);
/* Deletes a policy evaluation context */
void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);
/* Gets the peer certificate that the SCTs are for */
X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);
/* Sets the certificate associated with the received SCTs */
void CT_POLICY_EVAL_CTX_set0_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);
/* Gets the issuer of the aforementioned certificate */
X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);
/* Sets the issuer of the certificate associated with the received SCTs */
void CT_POLICY_EVAL_CTX_set0_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);
/* Gets the CT logs that are trusted sources of SCTs */
const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);
/* Sets the log store that is in use */
void CT_POLICY_EVAL_CTX_set0_log_store(CT_POLICY_EVAL_CTX *ctx,
CTLOG_STORE *log_store);
/*
* A callback for verifying that the received SCTs are sufficient.
* Expected to return 1 if they are sufficient, otherwise 0.
* May return a negative integer if an error occurs.
* A connection should be aborted if the SCTs are deemed insufficient.
*/
typedef int(*ct_validation_cb)(const CT_POLICY_EVAL_CTX *ctx,
const STACK_OF(SCT) *scts, void *arg);
/* Returns 0 if there are invalid SCTs */
int CT_verify_no_bad_scts(const CT_POLICY_EVAL_CTX *ctx,
const STACK_OF(SCT) *scts, void *arg);
/* Returns 0 if there are invalid SCTS or fewer than one valid SCT */
int CT_verify_at_least_one_good_sct(const CT_POLICY_EVAL_CTX *ctx,
const STACK_OF(SCT) *scts, void *arg);
/*****************
* SCT functions *
*****************/
/*
* Creates a new, blank SCT.
* The caller is responsible for calling SCT_free when finished with the SCT.
*/
SCT *SCT_new(void);
/*
* Creates a new SCT from some base64-encoded strings.
* The caller is responsible for calling SCT_free when finished with the SCT.
*/
SCT *SCT_new_from_base64(unsigned char version,
const char *logid_base64,
ct_log_entry_type_t entry_type,
uint64_t timestamp,
const char *extensions_base64,
const char *signature_base64);
/*
* Frees the SCT and the underlying data structures.
*/
void SCT_free(SCT *sct);
/*
* Free a stack of SCTs, and the underlying SCTs themselves.
* Intended to be compatible with X509V3_EXT_FREE.
*/
void SCT_LIST_free(STACK_OF(SCT) *a);
/*
* Returns the version of the SCT.
*/
sct_version_t SCT_get_version(const SCT *sct);
/*
* Set the version of an SCT.
* Returns 1 on success, 0 if the version is unrecognized.
*/
__owur int SCT_set_version(SCT *sct, sct_version_t version);
/*
* Returns the log entry type of the SCT.
*/
ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);
/*
* Set the log entry type of an SCT.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
/*
* Gets the ID of the log that an SCT came from.
* Ownership of the log ID remains with the SCT.
* Returns the length of the log ID.
*/
size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);
/*
* Set the log ID of an SCT to point directly to the *log_id specified.
* The SCT takes ownership of the specified pointer.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
/*
* Set the log ID of an SCT.
* This makes a copy of the log_id.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set1_log_id(SCT *sct, const unsigned char *log_id,
size_t log_id_len);
/*
* Returns the timestamp for the SCT (epoch time in milliseconds).
*/
uint64_t SCT_get_timestamp(const SCT *sct);
/*
* Set the timestamp of an SCT (epoch time in milliseconds).
*/
void SCT_set_timestamp(SCT *sct, uint64_t timestamp);
/*
* Return the NID for the signature used by the SCT.
* For CT v1, this will be either NID_sha256WithRSAEncryption or
* NID_ecdsa_with_SHA256 (or NID_undef if incorrect/unset).
*/
int SCT_get_signature_nid(const SCT *sct);
/*
* Set the signature type of an SCT
* For CT v1, this should be either NID_sha256WithRSAEncryption or
* NID_ecdsa_with_SHA256.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set_signature_nid(SCT *sct, int nid);
/*
* Set *ext to point to the extension data for the SCT. ext must not be NULL.
* The SCT retains ownership of this pointer.
* Returns length of the data pointed to.
*/
size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);
/*
* Set the extensions of an SCT to point directly to the *ext specified.
* The SCT takes ownership of the specified pointer.
*/
void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);
/*
* Set the extensions of an SCT.
* This takes a copy of the ext.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set1_extensions(SCT *sct, const unsigned char *ext,
size_t ext_len);
/*
* Set *sig to point to the signature for the SCT. sig must not be NULL.
* The SCT retains ownership of this pointer.
* Returns length of the data pointed to.
*/
size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);
/*
* Set the signature of an SCT to point directly to the *sig specified.
* The SCT takes ownership of the specified pointer.
*/
void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);
/*
* Set the signature of an SCT to be a copy of the *sig specified.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set1_signature(SCT *sct, const unsigned char *sig,
size_t sig_len);
/*
* The origin of this SCT, e.g. TLS extension, OCSP response, etc.
*/
sct_source_t SCT_get_source(const SCT *sct);
/*
* Set the origin of this SCT, e.g. TLS extension, OCSP response, etc.
* Returns 1 on success, 0 otherwise.
*/
__owur int SCT_set_source(SCT *sct, sct_source_t source);
/*
* Pretty-prints an |sct| to |out|.
* It will be indented by the number of spaces specified by |indent|.
* If |logs| is not NULL, it will be used to lookup the CT log that the SCT came
* from, so that the log name can be printed.
*/
void SCT_print(const SCT *sct, BIO *out, int indent, const CTLOG_STORE *logs);
/*
* Pretty-prints an |sct_list| to |out|.
* It will be indented by the number of spaces specified by |indent|.
* SCTs will be delimited by |separator|.
* If |logs| is not NULL, it will be used to lookup the CT log that each SCT
* came from, so that the log names can be printed.
*/
void SCT_LIST_print(const STACK_OF(SCT) *sct_list, BIO *out, int indent,
const char *separator, const CTLOG_STORE *logs);
/*
* Verifies an SCT with the given context.
* Returns 1 if the SCT verifies successfully, 0 otherwise.
*/
__owur int SCT_verify(const SCT_CTX *sctx,
|