.\" $OpenBSD: ACCESS_DESCRIPTION_new.3,v 1.4 2018/03/22 16:06:33 schwarze Exp $ .\" .\" Copyright (c) 2016 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR .\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES .\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN .\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF .\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. .\" .Dd $Mdocdate: March 22 2018 $ .Dt ACCESS_DESCRIPTION_NEW 3 .Os .Sh NAME .Nm ACCESS_DESCRIPTION_new , .Nm ACCESS_DESCRIPTION_free , .Nm AUTHORITY_INFO_ACCESS_new , .Nm AUTHORITY_INFO_ACCESS_free .Nd X.509 information access extensions .Sh SYNOPSIS .In openssl/x509v3.h .Ft ACCESS_DESCRIPTION * .Fn ACCESS_DESCRIPTION_new void .Ft void .Fn ACCESS_DESCRIPTION_free "ACCESS_DESCRIPTION *ad" .Ft AUTHORITY_INFO_ACCESS .Fn AUTHORITY_INFO_ACCESS_new void .Ft void .Fn AUTHORITY_INFO_ACCESS_free "AUTHORITY_INFO_ACCESS *aia" .Sh DESCRIPTION Using the information access extensions, certificates and certificate revocation lists can point to auxiliary information and services available online, for example online validation services or CA policy data. .Pp .Fn ACCESS_DESCRIPTION_new allocates and initializes an empty .Vt ACCESS_DESCRIPTION object, representing an ASN.1 .Vt AccessDescription structure defined in RFC 5280 section 4.2.2.1. It can hold a pointer to a .Vt GENERAL_NAME object documented in .Xr GENERAL_NAME_new 3 and an access method identifier. .Fn ACCESS_DESCRIPTION_free frees .Fa ad . .Pp The access method identifier is somewhat misnamed; it identifies the type and format of the information provided. How to access that information is often obvious from the .Vt GENERAL_NAME which may for example include a uniform resource identifier. .Pp Four standard access method identifiers are defined in RFC 5280: .Bl -bullet .It .Qq id-ad-caIssuers can occur in the authority information access extension of certificates and certificate revocation lists and provides access to certificates issued to the CA that issued the certificate, or provides access to certificates used for signing the CRL, in order to help constructing a certification path. .It .Qq id-ad-ocsp can occur in the authority information access extension of certificates and provides access to revocation information via the Online Certificate Status Protocol (OCSP) defined in RFC 6960. .It .Qq id-ad-caRepository can occur in the subject information access extension of CA certificates and provides access to an online repository of certificates issued by the CA. .It .Qq id-ad-timeStamping can occur in the subject information access extension of end entity certificates and indicates that the subject offers timestamping services using the Time Stamp Protocol defined in RFC 3161. .El .Pp .Fn AUTHORITY_INFO_ACCESS_new allocates and initializes an empty .Vt AUTHORITY_INFO_ACCESS object, which is a .Vt STACK_OF(ACCESS_DESCRIPTION) and represents an ASN.1 .Vt AuthorityInfoAccessSyntax structure defined in RFC 5280 section 4.2.2.1. If can be used for the authority information access extension of certificates and certificate revocation lists and for the subject information access extension of certificates. .Fn AUTHORITY_INFO_ACCESS_free frees .Fa aia . .Sh RETURN VALUES .Fn ACCESS_DESCRIPTION_new and .Fn AUTHORITY_INFO_ACCESS_new return the new .Vt ACCESS_DESCRIPTION or .Vt AUTHORITY_INFO_ACCESS object, respectively, or .Dv NULL if an error occurs. .Sh SEE ALSO .Xr DIST_POINT_new 3 , .Xr GENERAL_NAME_new 3 , .Xr OCSP_REQUEST_new 3 , .Xr TS_REQ_new 3 , .Xr X509_CRL_new 3 , .Xr X509_EXTENSION_new 3 , .Xr X509_new 3 .Sh STANDARDS These extensions are only defined in the following RFC and not specified in the underlying X.509 standard. .Pp RFC 5280: Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile: .Bl -dash -compact .It section 4.2.2.1: Certificate Extensions: Authority Information Access .It section 4.2.2.2: Certificate Extensions: Subject Information Access .It section 5.2.7: CRL Extensions: Authority Information Access .El .Pp Regarding OCSP and TSP, see: .Pp RFC 6960: X.509 Internet Public Key Infrastructure Online Certificate Status Protocol .Pp RFC 3161: Internet X.509 Public Key Infrastructure Time-Stamp Protocol .Sh HISTORY .Fn ACCESS_DESCRIPTION_new , .Fn ACCESS_DESCRIPTION_free , .Fn AUTHORITY_INFO_ACCESS_new , and .Fn AUTHORITY_INFO_ACCESS_free first appeared in OpenSSL 0.9.5 and have been available since .Ox 2.7 .