#ifndef HEADER_CT_H
# define HEADER_CT_H
+# include <openssl/ossl_typ.h>
# include <openssl/safestack.h>
# include <openssl/x509.h>
SCT_VERSION_V1 = 0
} sct_version_t;
-/*******************
- * Data structures *
- *******************/
+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;
-/* Signed Certificate Timestamp (SCT) */
-typedef struct sct_st SCT;
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(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(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 */
+CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(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 *
*/
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.
*/
* Set the version of an SCT.
* Returns 1 on success, 0 if the version is unrecognized.
*/
-int SCT_set_version(SCT *sct, sct_version_t version);
+__owur int SCT_set_version(SCT *sct, sct_version_t version);
/*
* Returns the log entry type of the SCT.
/*
* Set the log entry type of an SCT.
- * Returns 1 on success.
+ * Returns 1 on success, 0 otherwise.
*/
-int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
+__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.
/*
* 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.
+ * Returns 1 on success, 0 otherwise.
*/
-int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
+__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.
+ * Returns 1 on success, 0 otherwise.
*/
-int SCT_set1_log_id(SCT *sct, const unsigned char *log_id, size_t log_id_len);
+__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).
* 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.
+ * Returns 1 on success, 0 otherwise.
*/
-int SCT_set_signature_nid(SCT *sct, int nid);
+__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.
/*
* Set the extensions of an SCT.
* This takes a copy of the ext.
- * Returns 1 on success.
+ * Returns 1 on success, 0 otherwise.
*/
-int SCT_set1_extensions(SCT *sct, const unsigned char *ext, size_t ext_len);
+__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.
/*
* Set the signature of an SCT to be a copy of the *sig specified.
- * Returns 1 on success.
+ * Returns 1 on success, 0 otherwise.
*/
-int SCT_set1_signature(SCT *sct, const unsigned char *sig, size_t sig_len);
+__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);
+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 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, const SCT *sct);
+
+/*
+ * Verifies an SCT against the provided data.
+ * Returns 1 if the SCT verifies successfully, 0 otherwise.
+ */
+__owur int SCT_verify_v1(SCT *sct, X509 *cert, X509 *preissuer,
+ X509_PUBKEY *log_pubkey, X509 *issuer_cert);
+
+/*
+ * Gets the last result of validating this SCT.
+ * If it has not been validated yet, returns SCT_VALIDATION_STATUS_NOT_SET.
+ */
+sct_validation_status_t SCT_get_validation_status(const SCT *sct);
+
+/*
+ * Validates the given SCT with the provided context.
+ * Sets the "validation_status" field of the SCT.
+ * Returns 1 if the SCT is valid and the signature verifies.
+ * Returns 0 if the SCT is invalid or could not be verified.
+ * Returns -1 if an error occurs.
+ */
+__owur int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx);
+
+/*
+ * Validates the given list of SCTs with the provided context.
+ * Populates the "good_scts" and "bad_scts" of the evaluation context.
+ * Returns 1 if there are no invalid SCTs and all signatures verify.
+ * Returns 0 if at least one SCT is invalid or could not be verified.
+ * Returns a negative integer if an error occurs.
+ */
+__owur int SCT_LIST_validate(const STACK_OF(SCT) *scts,
+ CT_POLICY_EVAL_CTX *ctx);
+
/*********************************
* SCT parsing and serialisation *
* Returns < 0 on error, >= 0 indicating bytes written (or would have been)
* on success.
*/
-int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
+__owur int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
/*
* Convert TLS format SCT list to a stack of SCTs.
* Returns < 0 on error, >= 0 indicating bytes written (or would have been)
* on success.
*/
-int i2d_SCT_LIST(STACK_OF(SCT) *a, unsigned char **pp);
+__owur int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
/*
* Parses an SCT list in DER format and returns it.
* to it.
* The length of the SCT in TLS format will be returned.
*/
-int i2o_SCT(const SCT *sct, unsigned char **out);
+__owur int i2o_SCT(const SCT *sct, unsigned char **out);
/*
* Parses an SCT in TLS format and returns it.
* If |out| points to an allocated string, the signature will be written to it.
* The length of the signature in TLS format will be returned.
*/
-int i2o_SCT_signature(const SCT *sct, unsigned char **out);
+__owur int i2o_SCT_signature(const SCT *sct, unsigned char **out);
/*
* Parses an SCT signature in TLS format and populates the |sct| with it.
* |len| should be the length of the signature in |in|.
* Returns the number of bytes parsed, or a negative integer if an error occurs.
*/
-int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len);
+__owur int o2i_SCT_signature(SCT *sct, const unsigned char **in, size_t len);
+
+/********************
+ * CT log functions *
+ ********************/
+
+/*
+ * Creates a new CT log instance with the given |public_key| and |name|.
+ * Should be deleted by the caller using CTLOG_free when no longer needed.
+ */
+CTLOG *CTLOG_new(EVP_PKEY *public_key, const char *name);
+
+/*
+ * Creates a new, blank CT log instance.
+ * Should be deleted by the caller using CTLOG_free when no longer needed.
+ */
+CTLOG *CTLOG_new_null(void);
+
+/*
+ * Creates a new CT log instance with the given base64 public_key and |name|.
+ * Should be deleted by the caller using CTLOG_free when no longer needed.
+ */
+CTLOG *CTLOG_new_from_base64(const char *pkey_base64, const char *name);
+
+/*
+ * Deletes a CT log instance and its fields.
+ */
+void CTLOG_free(CTLOG *log);
+
+/* Gets the name of the CT log */
+const char *CTLOG_get0_name(const CTLOG *log);
+/* Gets the ID of the CT log */
+void CTLOG_get0_log_id(const CTLOG *log, const uint8_t **log_id,
+ size_t *log_id_len);
+/* Gets the public key of the CT log */
+EVP_PKEY *CTLOG_get0_public_key(const CTLOG *log);
+
+/**************************
+ * CT log store functions *
+ **************************/
+
+/*
+ * Creates a new CT log store.
+ * Should be deleted by the caller using CTLOG_STORE_free when no longer needed.
+ */
+CTLOG_STORE *CTLOG_STORE_new(void);
+
+/*
+ * Deletes a CT log store and all of the CT log instances held within.
+ */
+void CTLOG_STORE_free(CTLOG_STORE *store);
+
+/*
+ * Finds a CT log in the store based on its log ID.
+ * Returns the CT log, or NULL if no match is found.
+ */
+const CTLOG *CTLOG_STORE_get0_log_by_id(const CTLOG_STORE *store,
+ const uint8_t *log_id,
+ size_t log_id_len);
+
+/*
+ * Loads a CT log list into a |store| from a |file|.
+ * Returns 1 if loading is successful, or 0 otherwise.
+ */
+__owur int CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file);
+
+/*
+ * Loads the default CT log list into a |store|.
+ * See internal/cryptlib.h for the environment variable and file path that are
+ * consulted to find the default file.
+ * Returns 1 if loading is successful, or 0 otherwise.
+ */
+__owur int CTLOG_STORE_load_default_file(CTLOG_STORE *store);
/* BEGIN ERROR CODES */
/*
/* Error codes for the CT functions. */
/* Function codes. */
+# define CT_F_CTLOG_NEW 117
+# define CT_F_CTLOG_NEW_FROM_BASE64 118
+# define CT_F_CTLOG_NEW_FROM_CONF 119
+# define CT_F_CTLOG_NEW_NULL 120
+# define CT_F_CTLOG_STORE_GET0_LOG_BY_ID 121
+# define CT_F_CTLOG_STORE_LOAD_CTX_NEW 122
+# define CT_F_CTLOG_STORE_LOAD_FILE 123
+# define CT_F_CT_BASE64_DECODE 124
+# define CT_F_CT_POLICY_EVAL_CTX_GET0_CERT 130
+# define CT_F_CT_POLICY_EVAL_CTX_GET0_ISSUER 131
+# define CT_F_CT_POLICY_EVAL_CTX_GET0_LOG_STORE 132
+# define CT_F_CT_POLICY_EVAL_CTX_NEW 133
+# define CT_F_CT_POLICY_EVAL_CTX_SET0_CERT 134
+# define CT_F_CT_POLICY_EVAL_CTX_SET0_ISSUER 135
+# define CT_F_CT_POLICY_EVAL_CTX_SET0_LOG_STORE 136
+# define CT_F_CT_V1_LOG_ID_FROM_PKEY 125
+# define CT_F_CT_VERIFY_AT_LEAST_ONE_GOOD_SCT 137
+# define CT_F_CT_VERIFY_NO_BAD_SCTS 138
# define CT_F_D2I_SCT_LIST 105
# define CT_F_I2D_SCT_LIST 106
# define CT_F_I2O_SCT 107
# define CT_F_O2I_SCT 110
# define CT_F_O2I_SCT_LIST 111
# define CT_F_O2I_SCT_SIGNATURE 112
+# define CT_F_SCT_CTX_NEW 126
+# define CT_F_SCT_LIST_VALIDATE 139
# define CT_F_SCT_NEW 100
+# define CT_F_SCT_NEW_FROM_BASE64 127
# define CT_F_SCT_SET0_LOG_ID 101
# define CT_F_SCT_SET1_EXTENSIONS 114
# define CT_F_SCT_SET1_LOG_ID 115
# define CT_F_SCT_SET_SIGNATURE_NID 103
# define CT_F_SCT_SET_VERSION 104
# define CT_F_SCT_SIGNATURE_IS_VALID 113
+# define CT_F_SCT_VALIDATE 140
+# define CT_F_SCT_VERIFY 128
+# define CT_F_SCT_VERIFY_V1 129
/* Reason codes. */
+# define CT_R_BASE64_DECODE_ERROR 108
# define CT_R_INVALID_LOG_ID_LENGTH 100
+# define CT_R_LOG_CONF_INVALID 109
+# define CT_R_LOG_CONF_INVALID_KEY 110
+# define CT_R_LOG_CONF_MISSING_DESCRIPTION 111
+# define CT_R_LOG_CONF_MISSING_KEY 112
+# define CT_R_LOG_KEY_INVALID 113
+# define CT_R_NOT_ENOUGH_SCTS 116
# define CT_R_SCT_INVALID 104
# define CT_R_SCT_INVALID_SIGNATURE 107
# define CT_R_SCT_LIST_INVALID 105
+# define CT_R_SCT_LOG_ID_MISMATCH 114
# define CT_R_SCT_NOT_SET 106
+# define CT_R_SCT_UNSUPPORTED_VERSION 115
+# define CT_R_SCT_VALIDATION_STATUS_NOT_SET 117
# define CT_R_UNRECOGNIZED_SIGNATURE_NID 101
# define CT_R_UNSUPPORTED_ENTRY_TYPE 102
# define CT_R_UNSUPPORTED_VERSION 103
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