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216 lines
7.7 KiB
C
216 lines
7.7 KiB
C
/*
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* Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (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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* https://www.openssl.org/source/license.html
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*/
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#include <stddef.h>
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#include <openssl/ct.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/x509v3.h>
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#include <openssl/safestack.h>
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/*
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* From RFC6962: opaque SerializedSCT<1..2^16-1>; struct { SerializedSCT
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* sct_list <1..2^16-1>; } SignedCertificateTimestampList;
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*/
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# define MAX_SCT_SIZE 65535
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# define MAX_SCT_LIST_SIZE MAX_SCT_SIZE
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/*
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* Macros to read and write integers in network-byte order.
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*/
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#define n2s(c,s) ((s=(((unsigned int)((c)[0]))<< 8)| \
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(((unsigned int)((c)[1])) )),c+=2)
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#define s2n(s,c) ((c[0]=(unsigned char)(((s)>> 8)&0xff), \
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c[1]=(unsigned char)(((s) )&0xff)),c+=2)
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#define l2n3(l,c) ((c[0]=(unsigned char)(((l)>>16)&0xff), \
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c[1]=(unsigned char)(((l)>> 8)&0xff), \
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c[2]=(unsigned char)(((l) )&0xff)),c+=3)
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#define n2l8(c,l) (l =((uint64_t)(*((c)++)))<<56, \
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l|=((uint64_t)(*((c)++)))<<48, \
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l|=((uint64_t)(*((c)++)))<<40, \
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l|=((uint64_t)(*((c)++)))<<32, \
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l|=((uint64_t)(*((c)++)))<<24, \
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l|=((uint64_t)(*((c)++)))<<16, \
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l|=((uint64_t)(*((c)++)))<< 8, \
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l|=((uint64_t)(*((c)++))))
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#define l2n8(l,c) (*((c)++)=(unsigned char)(((l)>>56)&0xff), \
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*((c)++)=(unsigned char)(((l)>>48)&0xff), \
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*((c)++)=(unsigned char)(((l)>>40)&0xff), \
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*((c)++)=(unsigned char)(((l)>>32)&0xff), \
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*((c)++)=(unsigned char)(((l)>>24)&0xff), \
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*((c)++)=(unsigned char)(((l)>>16)&0xff), \
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*((c)++)=(unsigned char)(((l)>> 8)&0xff), \
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*((c)++)=(unsigned char)(((l) )&0xff))
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/* Signed Certificate Timestamp */
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struct sct_st {
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sct_version_t version;
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/* If version is not SCT_VERSION_V1, this contains the encoded SCT */
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unsigned char *sct;
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size_t sct_len;
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/* If version is SCT_VERSION_V1, fields below contain components of the SCT */
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unsigned char *log_id;
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size_t log_id_len;
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/*
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* Note, we cannot distinguish between an unset timestamp, and one
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* that is set to 0. However since CT didn't exist in 1970, no real
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* SCT should ever be set as such.
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*/
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uint64_t timestamp;
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unsigned char *ext;
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size_t ext_len;
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unsigned char hash_alg;
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unsigned char sig_alg;
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unsigned char *sig;
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size_t sig_len;
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/* Log entry type */
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ct_log_entry_type_t entry_type;
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/* Where this SCT was found, e.g. certificate, OCSP response, etc. */
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sct_source_t source;
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/* The result of the last attempt to validate this SCT. */
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sct_validation_status_t validation_status;
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};
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/* Miscellaneous data that is useful when verifying an SCT */
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struct sct_ctx_st {
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/* Public key */
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EVP_PKEY *pkey;
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/* Hash of public key */
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unsigned char *pkeyhash;
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size_t pkeyhashlen;
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/* For pre-certificate: issuer public key hash */
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unsigned char *ihash;
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size_t ihashlen;
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/* certificate encoding */
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unsigned char *certder;
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size_t certderlen;
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/* pre-certificate encoding */
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unsigned char *preder;
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size_t prederlen;
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/* milliseconds since epoch (to check that the SCT isn't from the future) */
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uint64_t epoch_time_in_ms;
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};
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/* Context when evaluating whether a Certificate Transparency policy is met */
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struct ct_policy_eval_ctx_st {
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X509 *cert;
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X509 *issuer;
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CTLOG_STORE *log_store;
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/* milliseconds since epoch (to check that SCTs aren't from the future) */
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uint64_t epoch_time_in_ms;
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};
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/*
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* Creates a new context for verifying an SCT.
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*/
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SCT_CTX *SCT_CTX_new(void);
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/*
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* Deletes an SCT verification context.
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*/
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void SCT_CTX_free(SCT_CTX *sctx);
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/*
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* Sets the certificate that the SCT was created for.
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* If *cert does not have a poison extension, presigner must be NULL.
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* If *cert does not have a poison extension, it may have a single SCT
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* (NID_ct_precert_scts) extension.
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* If either *cert or *presigner have an AKID (NID_authority_key_identifier)
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* extension, both must have one.
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* Returns 1 on success, 0 on failure.
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*/
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__owur int SCT_CTX_set1_cert(SCT_CTX *sctx, X509 *cert, X509 *presigner);
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/*
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* Sets the issuer of the certificate that the SCT was created for.
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* This is just a convenience method to save extracting the public key and
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* calling SCT_CTX_set1_issuer_pubkey().
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* Issuer must not be NULL.
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* Returns 1 on success, 0 on failure.
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*/
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__owur int SCT_CTX_set1_issuer(SCT_CTX *sctx, const X509 *issuer);
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/*
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* Sets the public key of the issuer of the certificate that the SCT was created
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* for.
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* The public key must not be NULL.
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* Returns 1 on success, 0 on failure.
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*/
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__owur int SCT_CTX_set1_issuer_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey);
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/*
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* Sets the public key of the CT log that the SCT is from.
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* Returns 1 on success, 0 on failure.
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*/
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__owur int SCT_CTX_set1_pubkey(SCT_CTX *sctx, X509_PUBKEY *pubkey);
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/*
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* Sets the time to evaluate the SCT against, in milliseconds since the Unix
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* epoch. If the SCT's timestamp is after this time, it will be interpreted as
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* having been issued in the future. RFC6962 states that "TLS clients MUST
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* reject SCTs whose timestamp is in the future", so an SCT will not validate
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* in this case.
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*/
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void SCT_CTX_set_time(SCT_CTX *sctx, uint64_t time_in_ms);
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/*
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* Verifies an SCT with the given context.
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* Returns 1 if the SCT verifies successfully; any other value indicates
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* failure. See EVP_DigestVerifyFinal() for the meaning of those values.
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*/
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__owur int SCT_CTX_verify(const SCT_CTX *sctx, const SCT *sct);
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/*
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* Does this SCT have the minimum fields populated to be usable?
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* Returns 1 if so, 0 otherwise.
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*/
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__owur int SCT_is_complete(const SCT *sct);
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/*
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* Does this SCT have the signature-related fields populated?
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* Returns 1 if so, 0 otherwise.
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* This checks that the signature and hash algorithms are set to supported
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* values and that the signature field is set.
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*/
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__owur int SCT_signature_is_complete(const SCT *sct);
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/*
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* TODO(RJPercival): Create an SCT_signature struct and make i2o_SCT_signature
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* and o2i_SCT_signature conform to the i2d/d2i conventions.
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*/
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/*
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* Serialize (to TLS format) an |sct| signature and write it to |out|.
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* If |out| is null, no signature will be output but the length will be returned.
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* If |out| points to a null pointer, a string will be allocated to hold the
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* TLS-format signature. It is the responsibility of the caller to free it.
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* If |out| points to an allocated string, the signature will be written to it.
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* The length of the signature in TLS format will be returned.
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*/
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__owur int i2o_SCT_signature(const SCT *sct, unsigned char **out);
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/*
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* Parses an SCT signature in TLS format and populates the |sct| with it.
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* |in| should be a pointer to a string containing the TLS-format signature.
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* |in| will be advanced to the end of the signature if parsing succeeds.
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* |len| should be the length of the signature in |in|.
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* Returns the number of bytes parsed, or a negative integer if an error occurs.
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* If an error occurs, the SCT's signature NID may be updated whilst the
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* signature field itself remains unset.
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*/
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__owur int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len);
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/*
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* Handlers for Certificate Transparency X509v3/OCSP extensions
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*/
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extern const X509V3_EXT_METHOD v3_ct_scts[3];
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