dane.c File Reference

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Functions
ldns_status	ldns_dane_create_tlsa_owner (ldns_rdf **tlsa_owner, const ldns_rdf *name, uint16_t port, ldns_dane_transport transport)
	Creates a dname consisting of the given name, prefixed by the service port and type of transport: _port._transport. More...
ldns_status	ldns_dane_cert2rdf (ldns_rdf **rdf, X509 *cert, ldns_tlsa_selector selector, ldns_tlsa_matching_type matching_type)
	Creates a LDNS_RDF_TYPE_HEX type rdf based on the binary data chosen by the selector and encoded using matching_type. More...
ldns_status	ldns_dane_select_certificate (X509 **selected_cert, X509 *cert, STACK_OF(X509) *extra_certs, X509_STORE *pkix_validation_store, ldns_tlsa_certificate_usage cert_usage, int offset)
	Selects the certificate from cert, extra_certs or the pkix_validation_store based on the value of cert_usage and index. More...
ldns_status	ldns_dane_create_tlsa_rr (ldns_rr **tlsa, ldns_tlsa_certificate_usage certificate_usage, ldns_tlsa_selector selector, ldns_tlsa_matching_type matching_type, X509 *cert)
	Creates a TLSA resource record from the certificate. More...
ldns_status	ldns_dane_verify_rr (const ldns_rr *tlsa_rr, X509 *cert, STACK_OF(X509) *extra_certs, X509_STORE *pkix_validation_store)
	BEWARE! We strongly recommend to use OpenSSL 1.1.0 dane verification functions instead of the ones provided by ldns. More...
ldns_status	ldns_dane_verify (const ldns_rr_list *tlsas, X509 *cert, STACK_OF(X509) *extra_certs, X509_STORE *pkix_validation_store)
	BEWARE! We strongly recommend to use OpenSSL 1.1.0 dane verification functions instead of the ones provided by ldns. More...

Function Documentation

ldns_dane_create_tlsa_owner()

ldns_status ldns_dane_create_tlsa_owner	(	ldns_rdf **	tlsa_owner,
		const ldns_rdf *	name,
		uint16_t	port,
		ldns_dane_transport	transport
	)

Creates a dname consisting of the given name, prefixed by the service port and type of transport: _port._transport.

name.

Parameters

[out]	tlsa_owner	The created dname.
[in]	name	The dname that should be prefixed.
[in]	port	The service port number for wich the name should be created.
[in]	transport	The transport for which the name should be created.

Returns

LDNS_STATUS_OK on success or an error code otherwise.

Definition at line 33 of file dane.c.

References LDNS_DANE_TRANSPORT_SCTP, LDNS_DANE_TRANSPORT_TCP, LDNS_DANE_TRANSPORT_UDP, LDNS_MAX_DOMAINLEN, ldns_rdf_data(), ldns_rdf_get_type(), ldns_rdf_new_frm_data(), ldns_rdf_size(), LDNS_RDF_TYPE_DNAME, LDNS_STATUS_DANE_UNKNOWN_TRANSPORT, LDNS_STATUS_DOMAINNAME_OVERFLOW, LDNS_STATUS_MEM_ERR, and LDNS_STATUS_OK.

ldns_dane_cert2rdf()

ldns_status ldns_dane_cert2rdf	(	ldns_rdf **	rdf,
		X509 *	cert,
		ldns_tlsa_selector	selector,
		ldns_tlsa_matching_type	matching_type
	)

Creates a LDNS_RDF_TYPE_HEX type rdf based on the binary data chosen by the selector and encoded using matching_type.

Parameters

[out]	rdf	The created created rdf of type LDNS_RDF_TYPE_HEX.
[in]	cert	The certificate from which the data is selected
[in]	selector	The full certificate or the public key
[in]	matching_type	The full data or the SHA256 or SHA512 hash of the selected data

Returns

LDNS_STATUS_OK on success or an error code otherwise.

Definition at line 77 of file dane.c.

References LDNS_FREE, ldns_rdf_new(), LDNS_RDF_TYPE_HEX, ldns_sha256(), LDNS_SHA256_DIGEST_LENGTH, ldns_sha512(), LDNS_SHA512_DIGEST_LENGTH, LDNS_STATUS_DANE_UNKNOWN_MATCHING_TYPE, LDNS_STATUS_DANE_UNKNOWN_SELECTOR, LDNS_STATUS_MEM_ERR, LDNS_STATUS_OK, LDNS_STATUS_SSL_ERR, LDNS_TLSA_MATCHING_TYPE_NO_HASH_USED, LDNS_TLSA_MATCHING_TYPE_SHA256, LDNS_TLSA_MATCHING_TYPE_SHA512, LDNS_TLSA_SELECTOR_FULL_CERTIFICATE, LDNS_TLSA_SELECTOR_SUBJECTPUBLICKEYINFO, and LDNS_XMALLOC.

ldns_dane_select_certificate()

ldns_status ldns_dane_select_certificate	(	X509 **	selected_cert,
		X509 *	cert,
		STACK_OF(X509) *	extra_certs,
		X509_STORE *	pkix_validation_store,
		ldns_tlsa_certificate_usage	cert_usage,
		int	index
	)

Selects the certificate from cert, extra_certs or the pkix_validation_store based on the value of cert_usage and index.

Parameters

[out]	selected_cert	The selected cert.
[in]	cert	The certificate to validate (or not)
[in]	extra_certs	Intermediate certificates that might be necessary during validation. May be NULL, except when the certificate usage is "Trust Anchor Assertion" because the trust anchor has to be provided.(otherwise choose a "Domain issued certificate!"
[in]	pkix_validation_store	Used when the certificate usage is "CA constraint" or "Service Certificate Constraint" to validate the certificate and, in case of "CA constraint", select the CA. When pkix_validation_store is NULL, validation is explicitly turned off and the behaviour is then the same as for "Trust anchor assertion" and "Domain issued certificate" respectively.
[in]	cert_usage	Which certificate to use and how to validate.
[in]	index	Used to select the trust anchor when certificate usage is "Trust Anchor Assertion". 0 is the last certificate in the validation chain. 1 the one but last, etc. When index is -1, the last certificate is used that MUST be self-signed. This can help to make sure that the intended (self signed) trust anchor is actually present in extra_certs (which is a DANE requirement).

Returns

LDNS_STATUS_OK on success or an error code otherwise.

Definition at line 348 of file dane.c.

References LDNS_TLSA_USAGE_CA_CONSTRAINT, LDNS_TLSA_USAGE_DOMAIN_ISSUED_CERTIFICATE, LDNS_TLSA_USAGE_SERVICE_CERTIFICATE_CONSTRAINT, and LDNS_TLSA_USAGE_TRUST_ANCHOR_ASSERTION.

ldns_dane_create_tlsa_rr()

ldns_status ldns_dane_create_tlsa_rr	(	ldns_rr **	tlsa,
		ldns_tlsa_certificate_usage	certificate_usage,
		ldns_tlsa_selector	selector,
		ldns_tlsa_matching_type	matching_type,
		X509 *	cert
	)

Creates a TLSA resource record from the certificate.

No PKIX validation is performed! The given certificate is used as data regardless the value of certificate_usage.

Parameters

[out]	tlsa	The created TLSA resource record.
[in]	certificate_usage	The value for the Certificate Usage field
[in]	selector	The value for the Selector field
[in]	matching_type	The value for the Matching Type field
[in]	cert	The certificate which data will be represented

Returns

LDNS_STATUS_OK on success or an error code otherwise.

Definition at line 454 of file dane.c.

References ldns_dane_cert2rdf(), ldns_native2rdf_int8(), LDNS_RDF_TYPE_INT8, ldns_rr_free(), ldns_rr_new_frm_type(), ldns_rr_set_rdf(), LDNS_RR_TYPE_TLSA, LDNS_STATUS_MEM_ERR, and LDNS_STATUS_OK.

ldns_dane_verify_rr()

ldns_status ldns_dane_verify_rr	(	const ldns_rr *	tlsa_rr,
		X509 *	cert,
		STACK_OF(X509) *	extra_certs,
		X509_STORE *	pkix_validation_store
	)

BEWARE! We strongly recommend to use OpenSSL 1.1.0 dane verification functions instead of the ones provided by ldns.

When OpenSSL 1.1.0 was available ldns will use the OpenSSL 1.1.0 dane verification functions under the hood. When ldns was linked with OpenSSL < 1.1.0, this function will not be able to verify TLSA records with DANE-TA usage types.

BEWARE! The ldns dane verification functions do not do server name checks. The user has to perform additional server name checks themselves!

Verify if the given TLSA resource record matches the given certificate. Reporting on a TLSA rr mismatch (LDNS_STATUS_DANE_TLSA_DID_NOT_MATCH) is preferred over PKIX failure (LDNS_STATUS_DANE_PKIX_DID_NOT_VALIDATE). So when PKIX validation is required by the TLSA Certificate usage, but the TLSA data does not match, LDNS_STATUS_DANE_TLSA_DID_NOT_MATCH is returned whether the PKIX validated or not.

When ldns is linked with OpenSSL < 1.1.0 and this function is available, then the DANE-TA usage type will not be verified, and on a tlsa_rr with this usage type, LDNS_STATUS_DANE_NEED_OPENSSL_GE_1_1_FOR_DANE_TA will be returned.

Parameters

[in]	tlsa_rr	The resource record that specifies what and how to match the certificate. With tlsa_rr == NULL, regular PKIX validation is performed.
[in]	cert	The certificate to match (and validate)
[in]	extra_certs	Intermediate certificates that might be necessary creating the validation chain.
[in]	pkix_validation_store	Used when the certificate usage is "CA constraint" or "Service Certificate Constraint" to validate the certificate.

Returns

LDNS_STATUS_OK on success, LDNS_STATUS_DANE_NEED_OPENSSL_GE_1_1_FOR_DANE_TA when the provided TLSA had the DANE-TA usage type, LDNS_STATUS_DANE_TLSA_DID_NOT_MATCH on TLSA data mismatch, LDNS_STATUS_DANE_PKIX_DID_NOT_VALIDATE when TLSA matched, but the PKIX validation failed, or other ldns_status errors.

Definition at line 601 of file dane.c.

References LDNS_STATUS_OK.

ldns_dane_verify()

ldns_status ldns_dane_verify	(	const ldns_rr_list *	tlsas,
		X509 *	cert,
		STACK_OF(X509) *	extra_certs,
		X509_STORE *	pkix_validation_store
	)

BEWARE! We strongly recommend to use OpenSSL 1.1.0 dane verification functions instead of the ones provided by ldns.

When OpenSSL 1.1.0 was available ldns will use the OpenSSL 1.1.0 dane verification functions under the hood. When ldns was linked with OpenSSL < 1.1.0, this function will not be able to verify TLSA records with DANE-TA usage types.

BEWARE! The ldns dane verification functions do not do server name checks. The user has to perform additional server name checks themselves!

Verify if any of the given TLSA resource records matches the given certificate.

Parameters

[in]	tlsas	The resource records that specify what and how to match the certificate. One must match for this function to succeed. With tlsas == NULL or the number of TLSA records in tlsas == 0, regular PKIX validation is performed.
[in]	cert	The certificate to match (and validate)
[in]	extra_certs	Intermediate certificates that might be necessary creating the validation chain.
[in]	pkix_validation_store	Used when the certificate usage is "CA constraint" or "Service Certificate Constraint" to validate the certificate.

Returns

LDNS_STATUS_OK on success, LDNS_STATUS_DANE_NEED_OPENSSL_GE_1_1_FOR_DANE_TA when at least one of the TLSA's had usage type DANE-TA and none of the TLSA's matched or PKIX validated, LDNS_STATUS_DANE_PKIX_DID_NOT_VALIDATE when one of the TLSA's matched but the PKIX validation failed, LDNS_STATUS_DANE_TLSA_DID_NOT_MATCH when none of the TLSA's matched, or other ldns_status errors.

Definition at line 784 of file dane.c.

References ldns_rr_list_rr_count(), and LDNS_STATUS_OK.