X509_get0_extensions (3)

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NAME

X509_get0_extensions, X509_CRL_get0_extensions, X509_REVOKED_get0_extensions, X509V3_get_d2i, X509V3_add1_i2d, X509V3_EXT_d2i, X509V3_EXT_i2d, X509_get_ext_d2i, X509_add1_ext_i2d, X509_CRL_get_ext_d2i, X509_CRL_add1_ext_i2d, X509_REVOKED_get_ext_d2i, X509_REVOKED_add1_ext_i2d - X509 extension decode and encode functions

SYNOPSIS

 #include <openssl/x509v3.h>

 void *X509V3_get_d2i(const STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
                      int *idx);
 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
                     int crit, unsigned long flags);

 void *X509V3_EXT_d2i(X509_EXTENSION *ext);
 X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext);

 void *X509_get_ext_d2i(const X509 *x, int nid, int *crit, int *idx);
 int X509_add1_ext_i2d(X509 *x, int nid, void *value, int crit,
                       unsigned long flags);

 void *X509_CRL_get_ext_d2i(const X509_CRL *crl, int nid, int *crit, int *idx);
 int X509_CRL_add1_ext_i2d(X509_CRL *crl, int nid, void *value, int crit,
                           unsigned long flags);

 void *X509_REVOKED_get_ext_d2i(const X509_REVOKED *r, int nid, int *crit, int *idx);
 int X509_REVOKED_add1_ext_i2d(X509_REVOKED *r, int nid, void *value, int crit,
                               unsigned long flags);

 const STACK_OF(X509_EXTENSION) *X509_get0_extensions(const X509 *x);
 const STACK_OF(X509_EXTENSION) *X509_CRL_get0_extensions(const X509_CRL *crl);
 const STACK_OF(X509_EXTENSION) *X509_REVOKED_get0_extensions(const X509_REVOKED *r);

DESCRIPTION

X509V3_get_ext_d2i() looks for an extension with nid in the extensions x and, if found, decodes it. If idx is then only one occurrence of an extension is permissible otherwise the first extension after index *idx is returned and *idx updated to the location of the extension. If crit is not then *crit is set to a status value: -2 if the extension occurs multiple times (this is only returned if idx is ), -1 if the extension could not be found, 0 if the extension is found and is not critical and 1 if critical. A pointer to an extension specific structure or is returned.

X509V3_add1_i2d() adds extension value to

*x (allocating a new if necessary) using nid and criticality crit according to flags.

X509V3_EXT_d2i() attempts to decode the

data contained in extension ext and returns a pointer to an extension specific structure or if the extension could not be decoded (invalid syntax or not supported).

X509V3_EXT_i2d() encodes the extension specific structure ext with

ext_nid and criticality crit.

X509_get_ext_d2i() and X509_add1_ext_i2d() operate on the extensions of certificate x, they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().

X509_CRL_get_ext_d2i() and X509_CRL_add1_ext_i2d() operate on the extensions of

crl, they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().

X509_REVOKED_get_ext_d2i() and X509_REVOKED_add1_ext_i2d() operate on the extensions of X509_REVOKED structure r (i.e for

entry extensions), they are otherwise identical to X509V3_get_d2i() and X509V3_add_i2d().

X509_get0_extensions(), X509_CRL_get0_extensions() and X509_REVOKED_get0_extensions() return a stack of all the extensions of a certificate a

or a entry respectively.

NOTES

In almost all cases an extension can occur at most once and multiple occurrences is an error. Therefore the idx parameter is usually .

The flags parameter may be one of the following values.

X509V3_ADD_DEFAULT appends a new extension only if the extension does not already exist. An error is returned if the extension does already exist.

X509V3_ADD_APPEND appends a new extension, ignoring whether the extension already exists.

X509V3_ADD_REPLACE replaces an extension if it exists otherwise appends a new extension.

X509V3_ADD_REPLACE_EXISTING replaces an existing extension if it exists otherwise returns an error.

X509V3_ADD_KEEP_EXISTING appends a new extension only if the extension does not already exist. An error is not returned if the extension does already exist.

X509V3_ADD_DELETE extension nid is deleted: no new extension is added.

If X509V3_ADD_SILENT is ored with flags: any error returned will not be added to the error queue.

The function X509V3_get_d2i() will return

if the extension is not found, occurs multiple times or cannot be decoded. It is possible to determine the precise reason by checking the value of *crit.

SUPPORTED EXTENSIONS

The following sections contain a list of all supported extensions including their name and

PKIX

Certificate Extensions

The following certificate extensions are defined in standards such as

 Basic Constraints                  NID_basic_constraints
 Key Usage                          NID_key_usage
 Extended Key Usage                 NID_ext_key_usage

 Subject Key Identifier             NID_subject_key_identifier
 Authority Key Identifier           NID_authority_key_identifier

 Private Key Usage Period           NID_private_key_usage_period

 Subject Alternative Name           NID_subject_alt_name
 Issuer Alternative Name            NID_issuer_alt_name

 Authority Information Access       NID_info_access
 Subject Information Access         NID_sinfo_access

 Name Constraints                   NID_name_constraints

 Certificate Policies               NID_certificate_policies
 Policy Mappings                    NID_policy_mappings
 Policy Constraints                 NID_policy_constraints
 Inhibit Any Policy                 NID_inhibit_any_policy

 TLS Feature                        NID_tlsfeature

Netscape Certificate Extensions

The following are (largely obsolete) Netscape certificate extensions.

 Netscape Cert Type                 NID_netscape_cert_type
 Netscape Base Url                  NID_netscape_base_url
 Netscape Revocation Url            NID_netscape_revocation_url
 Netscape CA Revocation Url         NID_netscape_ca_revocation_url
 Netscape Renewal Url               NID_netscape_renewal_url
 Netscape CA Policy Url             NID_netscape_ca_policy_url
 Netscape SSL Server Name           NID_netscape_ssl_server_name
 Netscape Comment                   NID_netscape_comment

Miscellaneous Certificate Extensions

 Strong Extranet ID                 NID_sxnet
 Proxy Certificate Information      NID_proxyCertInfo

PKIX CRL

Extensions

The following are extensions from standards such as

 CRL Number                         NID_crl_number
 CRL Distribution Points            NID_crl_distribution_points
 Delta CRL Indicator                NID_delta_crl
 Freshest CRL                       NID_freshest_crl
 Invalidity Date                    NID_invalidity_date
 Issuing Distribution Point         NID_issuing_distribution_point

The following are

entry extensions from standards such as

 CRL Reason Code                    NID_crl_reason
 Certificate Issuer                 NID_certificate_issuer

OCSP

Extensions

 OCSP Nonce                         NID_id_pkix_OCSP_Nonce
 OCSP CRL ID                        NID_id_pkix_OCSP_CrlID
 Acceptable OCSP Responses          NID_id_pkix_OCSP_acceptableResponses
 OCSP No Check                      NID_id_pkix_OCSP_noCheck
 OCSP Archive Cutoff                NID_id_pkix_OCSP_archiveCutoff
 OCSP Service Locator               NID_id_pkix_OCSP_serviceLocator
 Hold Instruction Code              NID_hold_instruction_code

Certificate Transparency Extensions

The following extensions are used by certificate transparency,

 CT Precertificate SCTs             NID_ct_precert_scts
 CT Certificate SCTs                NID_ct_cert_scts

RETURN VALUES

X509V3_EXT_d2i() and *X509V3_get_d2i() return a pointer to an extension specific structure of if an error occurs.

X509V3_EXT_i2d() returns a pointer to an X509_EXTENSION structure or

if an error occurs.

X509V3_add1_i2d() returns 1 if the operation is successful and 0 if it fails due to a non-fatal error (extension not found, already exists, cannot be encoded) or -1 due to a fatal error such as a memory allocation failure.

X509_get0_extensions(), X509_CRL_get0_extensions() and X509_REVOKED_get0_extensions() return a stack of extensions. They return

if no extensions are present.

SEE ALSO

d2i_X509(3), ERR_get_error(3), X509_CRL_get0_by_serial(3), X509_get0_signature(3), X509_get_ext_d2i(3), X509_get_extension_flags(3), X509_get_pubkey(3), X509_get_subject_name(3), X509_get_version(3), X509_NAME_add_entry_by_txt(3), X509_NAME_ENTRY_get_object(3), X509_NAME_get_index_by_NID(3), X509_NAME_print_ex(3), X509_new(3), X509_sign(3), X509_verify_cert(3)

COPYRIGHT

Copyright 2015-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the ``License''). You may not use this file except in compliance with the License. You can obtain a copy in the file

in the source distribution or at <www.openssl.org/source/license.html>.