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-.\"
-.\"     $OpenBSD: SSL_CTX_load_verify_locations.3,v 1.2 2014/12/02 14:11:01 jmc Exp $
-.\"
-.Dd $Mdocdate: December 2 2014 $
-.Dt SSL_CTX_LOAD_VERIFY_LOCATIONS 3
-.Os
-.Sh NAME
-.Nm SSL_CTX_load_verify_locations
-.Nd set default locations for trusted CA certificates
-.Sh SYNOPSIS
-.In openssl/ssl.h
-.Ft int
-.Fo SSL_CTX_load_verify_locations
-.Fa "SSL_CTX *ctx" "const char *CAfile" "const char *CApath"
-.Fc
-.Sh DESCRIPTION
-.Fn SSL_CTX_load_verify_locations
-specifies the locations for
-.Fa ctx ,
-at which CA certificates for verification purposes are located.
-The certificates available via
-.Fa CAfile
-and
-.Fa CApath
-are trusted.
-.Sh NOTES
-If
-.Fa CAfile
-is not
-.Dv NULL ,
-it points to a file of CA certificates in PEM format.
-The file can contain several CA certificates identified by sequences of:
-.Bd -literal
- -----BEGIN CERTIFICATE-----
- ... (CA certificate in base64 encoding) ...
- -----END CERTIFICATE-----
-.Ed
-Before, between, and after the certificates arbitrary text is allowed which can
-be used, e.g., for descriptions of the certificates.
-.Pp
-The
-.Fa CAfile
-is processed on execution of the
-.Fn SSL_CTX_load_verify_locations
-function.
-.Pp
-If
-.Fa CApath
-is not NULL, it points to a directory containing CA certificates in PEM format.
-The files each contain one CA certificate.
-The files are looked up by the CA subject name hash value,
-which must hence be available.
-If more than one CA certificate with the same name hash value exist,
-the extension must be different (e.g.,
-.Pa 9d66eef0.0 ,
-.Pa 9d66eef0.1 ,
-etc.).
-The search is performed in the ordering of the extension number,
-regardless of other properties of the certificates.
-.Pp
-The certificates in
-.Fa CApath
-are only looked up when required, e.g., when building the certificate chain or
-when actually performing the verification of a peer certificate.
-.Pp
-When looking up CA certificates, the OpenSSL library will first search the
-certificates in
-.Fa CAfile ,
-then those in
-.Fa CApath .
-Certificate matching is done based on the subject name, the key identifier (if
-present), and the serial number as taken from the certificate to be verified.
-If these data do not match, the next certificate will be tried.
-If a first certificate matching the parameters is found,
-the verification process will be performed;
-no other certificates for the same parameters will be searched in case of
-failure.
-.Pp
-In server mode, when requesting a client certificate, the server must send
-the list of CAs of which it will accept client certificates.
-This list is not influenced by the contents of
-.Fa CAfile
-or
-.Fa CApath
-and must explicitly be set using the
-.Xr SSL_CTX_set_client_CA_list 3
-family of functions.
-.Pp
-When building its own certificate chain, an OpenSSL client/server will try to
-fill in missing certificates from
-.Fa CAfile Ns / Fa CApath ,
-if the
-certificate chain was not explicitly specified (see
-.Xr SSL_CTX_add_extra_chain_cert 3
-and
-.Xr SSL_CTX_use_certificate 3 ) .
-.Sh WARNINGS
-If several CA certificates matching the name, key identifier, and serial
-number condition are available, only the first one will be examined.
-This may lead to unexpected results if the same CA certificate is available
-with different expiration dates.
-If a
-.Dq certificate expired
-verification error occurs, no other certificate will be searched.
-Make sure to not have expired certificates mixed with valid ones.
-.Sh RETURN VALUES
-The following return values can occur:
-.Bl -tag -width Ds
-.It 0
-The operation failed because
-.Fa CAfile
-and
-.Fa CApath
-are
-.Dv NULL
-or the processing at one of the locations specified failed.
-Check the error stack to find out the reason.
-.It 1
-The operation succeeded.
-.El
-.Sh EXAMPLES
-Generate a CA certificate file with descriptive text from the CA certificates
-.Pa ca1.pem
-.Pa ca2.pem
-.Pa ca3.pem :
-.Bd -literal
-#!/bin/sh
-rm CAfile.pem
-for i in ca1.pem ca2.pem ca3.pem; do
-        openssl x509 -in $i -text >> CAfile.pem
-done
-.Ed
-.Pp
-Prepare the directory /some/where/certs containing several CA certificates
-for use as
-.Fa CApath :
-.Bd -literal
-$ cd /some/where/certs
-$ rm -f *.[0-9]* *.r[0-9]*
-$ for c in *.pem; do
->    [ "$c" = "*.pem" ] && continue
->    hash=$(openssl x509 -noout -hash -in "$c")
->    if egrep -q -- '-BEGIN( X509 | TRUSTED | )CERTIFICATE-' "$c"; then
->      suf=0
->      while [ -e $hash.$suf ]; do suf=$(( $suf + 1 )); done
->      ln -s "$c" $hash.$suf
->    fi
->    if egrep -q -- '-BEGIN X509 CRL-' "$c"; then
->      suf=0
->      while [ -e $hash.r$suf ]; do suf=$(( $suf + 1 )); done
->      ln -s "$c" $hash.r$suf
->    fi
-> done
-.Ed
-.Sh SEE ALSO
-.Xr ssl 3 ,
-.Xr SSL_CTX_add_extra_chain_cert 3 ,
-.Xr SSL_CTX_set_cert_store 3 ,
-.Xr SSL_CTX_set_client_CA_list 3 ,
-.Xr SSL_CTX_use_certificate 3 ,
-.Xr SSL_get_client_CA_list 3