2 * {- join("\n * ", @autowarntext) -}
4 * Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.
6 * Licensed under the Apache License 2.0 (the "License"). You may not use
7 * this file except in compliance with the License. You can obtain a copy
8 * in the file LICENSE in the source distribution or at
9 * https://www.openssl.org/source/license.html
13 use OpenSSL::stackhash qw(generate_stack_macros);
20 # include <openssl/macros.h>
21 # ifndef OPENSSL_NO_DEPRECATED_3_0
25 # include <openssl/opensslconf.h>
27 # ifndef OPENSSL_NO_CT
28 # include <openssl/types.h>
29 # include <openssl/safestack.h>
30 # include <openssl/x509.h>
31 # include <openssl/cterr.h>
37 /* Minimum RSA key size, from RFC6962 */
38 # define SCT_MIN_RSA_BITS 2048
40 /* All hashes are SHA256 in v1 of Certificate Transparency */
41 # define CT_V1_HASHLEN SHA256_DIGEST_LENGTH
44 generate_stack_macros("SCT")
45 .generate_stack_macros("CTLOG");
50 CT_LOG_ENTRY_TYPE_NOT_SET = -1,
51 CT_LOG_ENTRY_TYPE_X509 = 0,
52 CT_LOG_ENTRY_TYPE_PRECERT = 1
53 } ct_log_entry_type_t;
56 SCT_VERSION_NOT_SET = -1,
62 SCT_SOURCE_TLS_EXTENSION,
63 SCT_SOURCE_X509V3_EXTENSION,
64 SCT_SOURCE_OCSP_STAPLED_RESPONSE
68 SCT_VALIDATION_STATUS_NOT_SET,
69 SCT_VALIDATION_STATUS_UNKNOWN_LOG,
70 SCT_VALIDATION_STATUS_VALID,
71 SCT_VALIDATION_STATUS_INVALID,
72 SCT_VALIDATION_STATUS_UNVERIFIED,
73 SCT_VALIDATION_STATUS_UNKNOWN_VERSION
74 } sct_validation_status_t;
76 /******************************************
77 * CT policy evaluation context functions *
78 ******************************************/
81 * Creates a new, empty policy evaluation context associated with the given
82 * library context and property query string.
83 * The caller is responsible for calling CT_POLICY_EVAL_CTX_free when finished
84 * with the CT_POLICY_EVAL_CTX.
86 CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new_ex(OSSL_LIB_CTX *libctx,
90 * The same as CT_POLICY_EVAL_CTX_new_ex() but the default library
91 * context and property query string is used.
93 CT_POLICY_EVAL_CTX *CT_POLICY_EVAL_CTX_new(void);
95 /* Deletes a policy evaluation context and anything it owns. */
96 void CT_POLICY_EVAL_CTX_free(CT_POLICY_EVAL_CTX *ctx);
98 /* Gets the peer certificate that the SCTs are for */
99 X509* CT_POLICY_EVAL_CTX_get0_cert(const CT_POLICY_EVAL_CTX *ctx);
102 * Sets the certificate associated with the received SCTs.
103 * Increments the reference count of cert.
104 * Returns 1 on success, 0 otherwise.
106 int CT_POLICY_EVAL_CTX_set1_cert(CT_POLICY_EVAL_CTX *ctx, X509 *cert);
108 /* Gets the issuer of the aforementioned certificate */
109 X509* CT_POLICY_EVAL_CTX_get0_issuer(const CT_POLICY_EVAL_CTX *ctx);
112 * Sets the issuer of the certificate associated with the received SCTs.
113 * Increments the reference count of issuer.
114 * Returns 1 on success, 0 otherwise.
116 int CT_POLICY_EVAL_CTX_set1_issuer(CT_POLICY_EVAL_CTX *ctx, X509 *issuer);
118 /* Gets the CT logs that are trusted sources of SCTs */
119 const CTLOG_STORE *CT_POLICY_EVAL_CTX_get0_log_store(const CT_POLICY_EVAL_CTX *ctx);
121 /* Sets the log store that is in use. It must outlive the CT_POLICY_EVAL_CTX. */
122 void CT_POLICY_EVAL_CTX_set_shared_CTLOG_STORE(CT_POLICY_EVAL_CTX *ctx,
123 CTLOG_STORE *log_store);
126 * Gets the time, in milliseconds since the Unix epoch, that will be used as the
127 * current time when checking whether an SCT was issued in the future.
128 * Such SCTs will fail validation, as required by RFC6962.
130 uint64_t CT_POLICY_EVAL_CTX_get_time(const CT_POLICY_EVAL_CTX *ctx);
133 * Sets the time to evaluate SCTs against, in milliseconds since the Unix epoch.
134 * If an SCT's timestamp is after this time, it will be interpreted as having
135 * been issued in the future. RFC6962 states that "TLS clients MUST reject SCTs
136 * whose timestamp is in the future", so an SCT will not validate in this case.
138 void CT_POLICY_EVAL_CTX_set_time(CT_POLICY_EVAL_CTX *ctx, uint64_t time_in_ms);
145 * Creates a new, blank SCT.
146 * The caller is responsible for calling SCT_free when finished with the SCT.
151 * Creates a new SCT from some base64-encoded strings.
152 * The caller is responsible for calling SCT_free when finished with the SCT.
154 SCT *SCT_new_from_base64(unsigned char version,
155 const char *logid_base64,
156 ct_log_entry_type_t entry_type,
158 const char *extensions_base64,
159 const char *signature_base64);
162 * Frees the SCT and the underlying data structures.
164 void SCT_free(SCT *sct);
167 * Free a stack of SCTs, and the underlying SCTs themselves.
168 * Intended to be compatible with X509V3_EXT_FREE.
170 void SCT_LIST_free(STACK_OF(SCT) *a);
173 * Returns the version of the SCT.
175 sct_version_t SCT_get_version(const SCT *sct);
178 * Set the version of an SCT.
179 * Returns 1 on success, 0 if the version is unrecognized.
181 __owur int SCT_set_version(SCT *sct, sct_version_t version);
184 * Returns the log entry type of the SCT.
186 ct_log_entry_type_t SCT_get_log_entry_type(const SCT *sct);
189 * Set the log entry type of an SCT.
190 * Returns 1 on success, 0 otherwise.
192 __owur int SCT_set_log_entry_type(SCT *sct, ct_log_entry_type_t entry_type);
195 * Gets the ID of the log that an SCT came from.
196 * Ownership of the log ID remains with the SCT.
197 * Returns the length of the log ID.
199 size_t SCT_get0_log_id(const SCT *sct, unsigned char **log_id);
202 * Set the log ID of an SCT to point directly to the *log_id specified.
203 * The SCT takes ownership of the specified pointer.
204 * Returns 1 on success, 0 otherwise.
206 __owur int SCT_set0_log_id(SCT *sct, unsigned char *log_id, size_t log_id_len);
209 * Set the log ID of an SCT.
210 * This makes a copy of the log_id.
211 * Returns 1 on success, 0 otherwise.
213 __owur int SCT_set1_log_id(SCT *sct, const unsigned char *log_id,
217 * Returns the timestamp for the SCT (epoch time in milliseconds).
219 uint64_t SCT_get_timestamp(const SCT *sct);
222 * Set the timestamp of an SCT (epoch time in milliseconds).
224 void SCT_set_timestamp(SCT *sct, uint64_t timestamp);
227 * Return the NID for the signature used by the SCT.
228 * For CT v1, this will be either NID_sha256WithRSAEncryption or
229 * NID_ecdsa_with_SHA256 (or NID_undef if incorrect/unset).
231 int SCT_get_signature_nid(const SCT *sct);
234 * Set the signature type of an SCT
235 * For CT v1, this should be either NID_sha256WithRSAEncryption or
236 * NID_ecdsa_with_SHA256.
237 * Returns 1 on success, 0 otherwise.
239 __owur int SCT_set_signature_nid(SCT *sct, int nid);
242 * Set *ext to point to the extension data for the SCT. ext must not be NULL.
243 * The SCT retains ownership of this pointer.
244 * Returns length of the data pointed to.
246 size_t SCT_get0_extensions(const SCT *sct, unsigned char **ext);
249 * Set the extensions of an SCT to point directly to the *ext specified.
250 * The SCT takes ownership of the specified pointer.
252 void SCT_set0_extensions(SCT *sct, unsigned char *ext, size_t ext_len);
255 * Set the extensions of an SCT.
256 * This takes a copy of the ext.
257 * Returns 1 on success, 0 otherwise.
259 __owur int SCT_set1_extensions(SCT *sct, const unsigned char *ext,
263 * Set *sig to point to the signature for the SCT. sig must not be NULL.
264 * The SCT retains ownership of this pointer.
265 * Returns length of the data pointed to.
267 size_t SCT_get0_signature(const SCT *sct, unsigned char **sig);
270 * Set the signature of an SCT to point directly to the *sig specified.
271 * The SCT takes ownership of the specified pointer.
273 void SCT_set0_signature(SCT *sct, unsigned char *sig, size_t sig_len);
276 * Set the signature of an SCT to be a copy of the *sig specified.
277 * Returns 1 on success, 0 otherwise.
279 __owur int SCT_set1_signature(SCT *sct, const unsigned char *sig,
283 * The origin of this SCT, e.g. TLS extension, OCSP response, etc.
285 sct_source_t SCT_get_source(const SCT *sct);
288 * Set the origin of this SCT, e.g. TLS extension, OCSP response, etc.
289 * Returns 1 on success, 0 otherwise.
291 __owur int SCT_set_source(SCT *sct, sct_source_t source);
294 * Returns a text string describing the validation status of |sct|.
296 const char *SCT_validation_status_string(const SCT *sct);
299 * Pretty-prints an |sct| to |out|.
300 * It will be indented by the number of spaces specified by |indent|.
301 * If |logs| is not NULL, it will be used to lookup the CT log that the SCT came
302 * from, so that the log name can be printed.
304 void SCT_print(const SCT *sct, BIO *out, int indent, const CTLOG_STORE *logs);
307 * Pretty-prints an |sct_list| to |out|.
308 * It will be indented by the number of spaces specified by |indent|.
309 * SCTs will be delimited by |separator|.
310 * If |logs| is not NULL, it will be used to lookup the CT log that each SCT
311 * came from, so that the log names can be printed.
313 void SCT_LIST_print(const STACK_OF(SCT) *sct_list, BIO *out, int indent,
314 const char *separator, const CTLOG_STORE *logs);
317 * Gets the last result of validating this SCT.
318 * If it has not been validated yet, returns SCT_VALIDATION_STATUS_NOT_SET.
320 sct_validation_status_t SCT_get_validation_status(const SCT *sct);
323 * Validates the given SCT with the provided context.
324 * Sets the "validation_status" field of the SCT.
325 * Returns 1 if the SCT is valid and the signature verifies.
326 * Returns 0 if the SCT is invalid or could not be verified.
327 * Returns -1 if an error occurs.
329 __owur int SCT_validate(SCT *sct, const CT_POLICY_EVAL_CTX *ctx);
332 * Validates the given list of SCTs with the provided context.
333 * Sets the "validation_status" field of each SCT.
334 * Returns 1 if there are no invalid SCTs and all signatures verify.
335 * Returns 0 if at least one SCT is invalid or could not be verified.
336 * Returns a negative integer if an error occurs.
338 __owur int SCT_LIST_validate(const STACK_OF(SCT) *scts,
339 CT_POLICY_EVAL_CTX *ctx);
342 /*********************************
343 * SCT parsing and serialization *
344 *********************************/
347 * Serialize (to TLS format) a stack of SCTs and return the length.
348 * "a" must not be NULL.
349 * If "pp" is NULL, just return the length of what would have been serialized.
350 * If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
351 * for data that caller is responsible for freeing (only if function returns
353 * If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
354 * that "*pp" is large enough to accept all of the serialized data.
355 * Returns < 0 on error, >= 0 indicating bytes written (or would have been)
358 __owur int i2o_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
361 * Convert TLS format SCT list to a stack of SCTs.
362 * If "a" or "*a" is NULL, a new stack will be created that the caller is
363 * responsible for freeing (by calling SCT_LIST_free).
364 * "**pp" and "*pp" must not be NULL.
365 * Upon success, "*pp" will point to after the last bytes read, and a stack
367 * Upon failure, a NULL pointer will be returned, and the position of "*pp" is
370 STACK_OF(SCT) *o2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
374 * Serialize (to DER format) a stack of SCTs and return the length.
375 * "a" must not be NULL.
376 * If "pp" is NULL, just returns the length of what would have been serialized.
377 * If "pp" is not NULL and "*pp" is null, function will allocate a new pointer
378 * for data that caller is responsible for freeing (only if function returns
380 * If "pp" is NULL and "*pp" is not NULL, caller is responsible for ensuring
381 * that "*pp" is large enough to accept all of the serialized data.
382 * Returns < 0 on error, >= 0 indicating bytes written (or would have been)
385 __owur int i2d_SCT_LIST(const STACK_OF(SCT) *a, unsigned char **pp);
388 * Parses an SCT list in DER format and returns it.
389 * If "a" or "*a" is NULL, a new stack will be created that the caller is
390 * responsible for freeing (by calling SCT_LIST_free).
391 * "**pp" and "*pp" must not be NULL.
392 * Upon success, "*pp" will point to after the last bytes read, and a stack
394 * Upon failure, a NULL pointer will be returned, and the position of "*pp" is
397 STACK_OF(SCT) *d2i_SCT_LIST(STACK_OF(SCT) **a, const unsigned char **pp,
401 * Serialize (to TLS format) an |sct| and write it to |out|.
402 * If |out| is null, no SCT will be output but the length will still be returned.
403 * If |out| points to a null pointer, a string will be allocated to hold the
404 * TLS-format SCT. It is the responsibility of the caller to free it.
405 * If |out| points to an allocated string, the TLS-format SCT will be written
407 * The length of the SCT in TLS format will be returned.
409 __owur int i2o_SCT(const SCT *sct, unsigned char **out);
412 * Parses an SCT in TLS format and returns it.
413 * If |psct| is not null, it will end up pointing to the parsed SCT. If it
414 * already points to a non-null pointer, the pointer will be free'd.
415 * |in| should be a pointer to a string containing the TLS-format SCT.
416 * |in| will be advanced to the end of the SCT if parsing succeeds.
417 * |len| should be the length of the SCT in |in|.
418 * Returns NULL if an error occurs.
419 * If the SCT is an unsupported version, only the SCT's 'sct' and 'sct_len'
420 * fields will be populated (with |in| and |len| respectively).
422 SCT *o2i_SCT(SCT **psct, const unsigned char **in, size_t len);
424 /********************
426 ********************/
429 * Creates a new CT log instance with the given |public_key| and |name| and
430 * associates it with the give library context |libctx| and property query
432 * Takes ownership of |public_key| but copies |name|.
433 * Returns NULL if malloc fails or if |public_key| cannot be converted to DER.
434 * Should be deleted by the caller using CTLOG_free when no longer needed.
436 CTLOG *CTLOG_new_ex(EVP_PKEY *public_key, const char *name, OSSL_LIB_CTX *libctx,
440 * The same as CTLOG_new_ex except that the default library context and
441 * property query string are used.
443 CTLOG *CTLOG_new(EVP_PKEY *public_key, const char *name);
446 * Creates a new CTLOG instance with the base64-encoded SubjectPublicKeyInfo DER
447 * in |pkey_base64| and associated with the given library context |libctx| and
448 * property query string |propq|. The |name| is a string to help users identify
450 * Returns 1 on success, 0 on failure.
451 * Should be deleted by the caller using CTLOG_free when no longer needed.
453 int CTLOG_new_from_base64_ex(CTLOG **ct_log, const char *pkey_base64,
454 const char *name, OSSL_LIB_CTX *libctx,
458 * The same as CTLOG_new_from_base64_ex() except that the default
459 * library context and property query string are used.
460 * Returns 1 on success, 0 on failure.
462 int CTLOG_new_from_base64(CTLOG ** ct_log,
463 const char *pkey_base64, const char *name);
466 * Deletes a CT log instance and its fields.
468 void CTLOG_free(CTLOG *log);
470 /* Gets the name of the CT log */
471 const char *CTLOG_get0_name(const CTLOG *log);
472 /* Gets the ID of the CT log */
473 void CTLOG_get0_log_id(const CTLOG *log, const uint8_t **log_id,
475 /* Gets the public key of the CT log */
476 EVP_PKEY *CTLOG_get0_public_key(const CTLOG *log);
478 /**************************
479 * CT log store functions *
480 **************************/
483 * Creates a new CT log store and associates it with the given libctx and
484 * property query string.
485 * Should be deleted by the caller using CTLOG_STORE_free when no longer needed.
487 CTLOG_STORE *CTLOG_STORE_new_ex(OSSL_LIB_CTX *libctx, const char *propq);
490 * Same as CTLOG_STORE_new_ex except that the default libctx and
491 * property query string are used.
492 * Should be deleted by the caller using CTLOG_STORE_free when no longer needed.
494 CTLOG_STORE *CTLOG_STORE_new(void);
497 * Deletes a CT log store and all of the CT log instances held within.
499 void CTLOG_STORE_free(CTLOG_STORE *store);
502 * Finds a CT log in the store based on its log ID.
503 * Returns the CT log, or NULL if no match is found.
505 const CTLOG *CTLOG_STORE_get0_log_by_id(const CTLOG_STORE *store,
506 const uint8_t *log_id,
510 * Loads a CT log list into a |store| from a |file|.
511 * Returns 1 if loading is successful, or 0 otherwise.
513 __owur int CTLOG_STORE_load_file(CTLOG_STORE *store, const char *file);
516 * Loads the default CT log list into a |store|.
517 * Returns 1 if loading is successful, or 0 otherwise.
519 __owur int CTLOG_STORE_load_default_file(CTLOG_STORE *store);