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.\" ========================================================================
.\"
.IX Title "X509_LOOKUP 3"
.TH X509_LOOKUP 3 "2021-08-24" "1.1.1l" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
X509_LOOKUP, X509_LOOKUP_TYPE, X509_LOOKUP_new, X509_LOOKUP_free, X509_LOOKUP_init, X509_LOOKUP_shutdown, X509_LOOKUP_set_method_data, X509_LOOKUP_get_method_data, X509_LOOKUP_ctrl, X509_LOOKUP_load_file, X509_LOOKUP_add_dir, X509_LOOKUP_get_store, X509_LOOKUP_by_subject, X509_LOOKUP_by_issuer_serial, X509_LOOKUP_by_fingerprint, X509_LOOKUP_by_alias \&\- OpenSSL certificate lookup mechanisms
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/x509_vfy.h>
\&
\& typedef x509_lookup_st X509_LOOKUP;
\&
\& typedef enum X509_LOOKUP_TYPE;
\&
\& X509_LOOKUP *X509_LOOKUP_new(X509_LOOKUP_METHOD *method);
\& int X509_LOOKUP_init(X509_LOOKUP *ctx);
\& int X509_LOOKUP_shutdown(X509_LOOKUP *ctx);
\& void X509_LOOKUP_free(X509_LOOKUP *ctx);
\&
\& int X509_LOOKUP_set_method_data(X509_LOOKUP *ctx, void *data);
\& void *X509_LOOKUP_get_method_data(const X509_LOOKUP *ctx);
\&
\& int X509_LOOKUP_ctrl(X509_LOOKUP *ctx, int cmd, const char *argc,
\& long argl, char **ret);
\& int X509_LOOKUP_load_file(X509_LOOKUP *ctx, char *name, long type);
\& int X509_LOOKUP_add_dir(X509_LOOKUP *ctx, char *name, long type);
\&
\& X509_STORE *X509_LOOKUP_get_store(const X509_LOOKUP *ctx);
\&
\& int X509_LOOKUP_by_subject(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
\& X509_NAME *name, X509_OBJECT *ret);
\& int X509_LOOKUP_by_issuer_serial(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
\& X509_NAME *name, ASN1_INTEGER *serial,
\& X509_OBJECT *ret);
\& int X509_LOOKUP_by_fingerprint(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
\& const unsigned char *bytes, int len,
\& X509_OBJECT *ret);
\& int X509_LOOKUP_by_alias(X509_LOOKUP *ctx, X509_LOOKUP_TYPE type,
\& const char *str, int len, X509_OBJECT *ret);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBX509_LOOKUP\fR structure holds the information needed to look up
certificates and CRLs according to an associated \fIX509_LOOKUP_METHOD\fR\|(3).
Multiple \fBX509_LOOKUP\fR instances can be added to an \fIX509_STORE\fR\|(3)
to enable lookup in that store.
.PP
\&\fIX509_LOOKUP_new()\fR creates a new \fBX509_LOOKUP\fR using the given lookup
\&\fImethod\fR.
It can also be created by calling \fIX509_STORE_add_lookup\fR\|(3), which
will associate an \fBX509_STORE\fR with the lookup mechanism.
.PP
\&\fIX509_LOOKUP_init()\fR initializes the internal state and resources as
needed by the given \fBX509_LOOKUP\fR to do its work.
.PP
\&\fIX509_LOOKUP_shutdown()\fR tears down the internal state and resources of
the given \fBX509_LOOKUP\fR.
.PP
\&\fIX509_LOOKUP_free()\fR destructs the given \fBX509_LOOKUP\fR.
.PP
\&\fIX509_LOOKUP_set_method_data()\fR associates a pointer to application data
to the given \fBX509_LOOKUP\fR.
.PP
\&\fIX509_LOOKUP_get_method_data()\fR retrieves a pointer to application data
from the given \fBX509_LOOKUP\fR.
.PP
\&\fIX509_LOOKUP_ctrl()\fR is used to set or get additional data to or from an
\&\fBX509_LOOKUP\fR structure or its associated \fIX509_LOOKUP_METHOD\fR\|(3).
The arguments of the control command are passed via \fIargc\fR and \fIargl\fR,
its return value via \fI*ret\fR.
The meaning of the arguments depends on the \fIcmd\fR number of the
control command. In general, this function is not called directly, but
wrapped by a macro call, see below.
The control \fIcmd\fRs known to OpenSSL are discussed in more depth
in \*(L"Control Commands\*(R".
.PP
\&\fIX509_LOOKUP_load_file()\fR passes a filename to be loaded immediately
into the associated \fBX509_STORE\fR.
\&\fItype\fR indicates what type of object is expected.
This can only be used with a lookup using the implementation
\&\fIX509_LOOKUP_file\fR\|(3).
.PP
\&\fIX509_LOOKUP_add_dir()\fR passes a directory specification from which
certificates and CRLs are loaded on demand into the associated
\&\fBX509_STORE\fR.
\&\fItype\fR indicates what type of object is expected.
This can only be used with a lookup using the implementation
\&\fIX509_LOOKUP_hash_dir\fR\|(3).
.PP
\&\fIX509_LOOKUP_load_file()\fR, \fIX509_LOOKUP_add_dir()\fR,
\&\fIX509_LOOKUP_add_store()\fR, and \fIX509_LOOKUP_load_store()\fR are implemented
as macros that use \fIX509_LOOKUP_ctrl()\fR.
.PP
\&\fIX509_LOOKUP_by_subject()\fR, \fIX509_LOOKUP_by_issuer_serial()\fR,
\&\fIX509_LOOKUP_by_fingerprint()\fR, and \fIX509_LOOKUP_by_alias()\fR look up
certificates and CRLs in the \fIX509_STORE\fR\|(3) associated with the
\&\fBX509_LOOKUP\fR using different criteria, where the looked up object is
stored in \fIret\fR.
Some of the underlying \fBX509_LOOKUP_METHOD\fRs will also cache objects
matching the criteria in the associated \fBX509_STORE\fR, which makes it
possible to handle cases where the criteria have more than one hit.
.SS "File Types"
.IX Subsection "File Types"
\&\fIX509_LOOKUP_load_file()\fR and \fIX509_LOOKUP_add_dir()\fR take a \fItype\fR,
which can be one of the following:
.IP "\fBX509_FILETYPE_PEM\fR" 4
.IX Item "X509_FILETYPE_PEM"
The file or files that are loaded are expected to be in \s-1PEM\s0 format.
.IP "\fBX509_FILETYPE_ASN1\fR" 4
.IX Item "X509_FILETYPE_ASN1"
The file or files that are loaded are expected to be in raw \s-1DER\s0 format.
.IP "\fBX509_FILETYPE_DEFAULT\fR" 4
.IX Item "X509_FILETYPE_DEFAULT"
The default certificate file or directory is used. In this case,
\&\fIname\fR is ignored.
.SS "Control Commands"
.IX Subsection "Control Commands"
The \fBX509_LOOKUP_METHOD\fRs built into OpenSSL recognise the following
\&\fIX509_LOOKUP_ctrl()\fR \fIcmd\fRs:
.IP "\fBX509_L_FILE_LOAD\fR" 4
.IX Item "X509_L_FILE_LOAD"
This is the command that \fIX509_LOOKUP_load_file()\fR uses.
The filename is passed in \fIargc\fR, and the type in \fIargl\fR.
.IP "\fBX509_L_ADD_DIR\fR" 4
.IX Item "X509_L_ADD_DIR"
This is the command that \fIX509_LOOKUP_add_dir()\fR uses.
The directory specification is passed in \fIargc\fR, and the type in
\&\fIargl\fR.
.IP "\fBX509_L_ADD_STORE\fR" 4
.IX Item "X509_L_ADD_STORE"
This is the command that \fIX509_LOOKUP_add_store()\fR uses.
The \s-1URI\s0 is passed in \fIargc\fR.
.IP "\fBX509_L_LOAD_STORE\fR" 4
.IX Item "X509_L_LOAD_STORE"
This is the command that \fIX509_LOOKUP_load_store()\fR uses.
The \s-1URI\s0 is passed in \fIargc\fR.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fIX509_LOOKUP_new()\fR returns an \fBX509_LOOKUP\fR pointer when successful,
or \s-1NULL\s0 on error.
.PP
\&\fIX509_LOOKUP_init()\fR and \fIX509_LOOKUP_shutdown()\fR return 1 on success, or
0 on error.
.PP
\&\fIX509_LOOKUP_ctrl()\fR returns \-1 if the \fBX509_LOOKUP\fR doesn't have an
associated \fBX509_LOOKUP_METHOD\fR, or 1 if the
doesn't have a control function.
Otherwise, it returns what the control function in the
\&\fBX509_LOOKUP_METHOD\fR returns, which is usually 1 on success and 0 in
error.
.IX Xref "509_LOOKUP_METHOD"
.PP
\&\fIX509_LOOKUP_get_store()\fR returns an \fBX509_STORE\fR pointer if there is
one, otherwise \s-1NULL\s0.
.PP
\&\fIX509_LOOKUP_by_subject()\fR, \fIX509_LOOKUP_by_issuer_serial()\fR,
\&\fIX509_LOOKUP_by_fingerprint()\fR, and \fIX509_LOOKUP_by_alias()\fR all return 0
if there is no \fBX509_LOOKUP_METHOD\fR or that method doesn't implement
the corresponding function.
Otherwise, it returns what the corresponding function in the
\&\fBX509_LOOKUP_METHOD\fR returns, which is usually 1 on success and 0 in
error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fIX509_LOOKUP_METHOD\fR\|(3), \fIX509_STORE\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
Copyright 2K16 - 2K18 Indonesian Hacker Rulez
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