mirror of
https://github.com/openssl/openssl.git
synced 2024-11-27 05:21:51 +08:00
c03726ca41
Make all mention of digest algorithm use "any supported algorithm"
RT2071, some new manpages from Victor B. Wagner <vitus@cryptocom.ru>:
X509_LOOKUP_hash_dir.pod
X509_check_ca.pod
X509_check_issued.pod
RT 1600:
Remove references to non-existant objects(3)
Add RETURN VALUES to BIO_do_accept page.
RT1818:
RSA_sign Can return values other than 0 on failure.
RT3634:
Fix AES CBC aliases (Steffen Nurpmeso <sdaoden@yandex.com>)
RT3678:
Some clarifications to BIO_new_pair
(Devchandra L Meetei <dlmeetei@gmail.com>)
RT3787:
Fix some EVP_ function return values
(Laetitia Baudoin <lbaudoin@google.com>)
Reviewed-by: Tim Hudson <tjh@openssl.org>
115 lines
3.9 KiB
Plaintext
115 lines
3.9 KiB
Plaintext
=pod
|
|
|
|
=head1 NAME
|
|
|
|
X509_LOOKUP_hash_dir, X509_LOOKUP_file,
|
|
X509_load_cert_file,
|
|
X509_load_crl_file,
|
|
X509_load_cert_crl_file - Default OpenSSL certificate
|
|
lookup methods
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
#include <openssl/x509_vfy.h>
|
|
|
|
X509_LOOKUP_METHOD *X509_LOOKUP_hash_dir(void);
|
|
X509_LOOKUP_METHOD *X509_LOOKUP_file(void);
|
|
|
|
int X509_load_cert_file(X509_LOOKUP *ctx, const char *file, int type);
|
|
int X509_load_crl_file(X509_LOOKUP *ctx, const char *file, int type);
|
|
int X509_load_cert_crl_file(X509_LOOKUP *ctx, const char *file, int type);
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
B<X509_LOOKUP_hash_dir> and B<X509_LOOKUP_file> are two certificate
|
|
lookup methods to use with B<X509_STORE>, provided by OpenSSL library.
|
|
|
|
Users of the library typically do not need to create instanses of these
|
|
methods manually, they would be created automatically by
|
|
L<X509_STORE_load_locations(3)> or
|
|
L<SSL_CTX_load_verify_locations(3)>
|
|
functions.
|
|
|
|
Internally loading of certificates and CRLs is implemented via functions
|
|
B<X509_load_cert_crl_file>, B<X509_load_cert_file> and
|
|
B<X509_load_crl_file>. These functions support parameter I<type>, which
|
|
can be one of constants B<FILETYPE_PEM>, B<FILETYPE_ASN1> and
|
|
B<FILETYPE_DEFAULT>. They load certificates and/or CRLs from specified
|
|
file into memory cache of B<X509_STORE> objects which given B<ctx>
|
|
parameter is associated with.
|
|
|
|
Functions B<X509_load_cert_file> and
|
|
B<X509_load_crl_file> can load both PEM and DER formats depending of
|
|
type value. Because DER format cannot contain more than one certificate
|
|
or CRL object (while PEM can contain several concatenated PEM objects)
|
|
B<X509_load_cert_crl_file> with B<FILETYPE_ASN1> is equivalent to
|
|
B<X509_load_cert_file>.
|
|
|
|
Constant B<FILETYPE_DEFAULT> with NULL filename causes these functions
|
|
to load default certificate store file (see
|
|
L<X509_STORE_set_default_paths>.
|
|
|
|
|
|
Functions return number of objects loaded from file or 0 in case of
|
|
error.
|
|
|
|
Both methods support adding several certificate locations into one
|
|
B<X509_STORE>.
|
|
|
|
This page documents certificate store formats used by these methods and
|
|
caching policy.
|
|
|
|
=head2 FILE METHOD
|
|
|
|
B<X509_LOOKUP_file> method loads entire set of certificates and CRLs
|
|
into memory immediately when file name is passed to it.
|
|
|
|
File format is ASCII text which contains concatenated PEM certificates
|
|
and CRLs.
|
|
|
|
This method should be used by applications which work with limited set
|
|
of CAs.
|
|
|
|
|
|
=head2 HASHED DIR METHOD
|
|
|
|
B<X509_LOOKUP_hash_dir> is more sophisticated method, which loads
|
|
certificates and CRLs on demand, but caches them in the memory once they
|
|
are loaded. However, since OpenSSL 1.0.0beta1 it checks for newer CRLs
|
|
upon each lookup, so if newer CRL would appear in the directory, it
|
|
would be loaded.
|
|
|
|
Directory should contain each certificate and CRL in the separate file
|
|
in the PEM format, with file name derived from certificate subject (or CRL
|
|
issuer) hash, as returned by L<X509_NAME_hash(3)>
|
|
function of with option B<-hash> of L<x509(1)> or
|
|
L<crl(1)> command.
|
|
|
|
This hash value is appended by suffix .I<N> for certificates and
|
|
B<.r>I<N> for CRLs where I<N> is sequentual
|
|
number among certificates with same hash value, so it is possible to
|
|
have in the store several certificates with same subject or several CRLs
|
|
with same issuer (and, for example, different validity period).
|
|
|
|
When checking for new CRLs once one CRL for given hash value is loaded,
|
|
hash_dir lookup method checks only for certificates with sequentual
|
|
number greater than one of already cached CRL.
|
|
|
|
Note that hash algorithm used for subject hashing is changed in OpenSSL
|
|
1.0, so all certificate stores have to be rehashed upon transitopn from
|
|
0.9.8 to 1.0.0.
|
|
|
|
OpenSSL includes utility L<c_rehash(1)> which creates
|
|
symlinks with correct hashed names for all files with .pem suffix in the
|
|
given directory.
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<pem(3)>, L<d2i_X509_bio(3)>,
|
|
L<X509_STORE_load_locations(3)>,
|
|
L<X609_store_add_lookup(3)>,
|
|
L<SSL_CTX_load_verify_locations(3)>,
|
|
|
|
=cut
|
|
|