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+.\" ======================================================================
+.\"
+.IX Title "SSL_CTX_LOAD_VERIFY_LOCATIONS 1"
+.TH SSL_CTX_LOAD_VERIFY_LOCATIONS 1 "perl v5.6.1" "2002-01-27" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+SSL_CTX_load_verify_locations \- set default locations for trusted \s-1CA\s0
+certificates
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/ssl.h>
+.Ve
+.Vb 2
+\& int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
+\&                                   const char *CApath);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\fISSL_CTX_load_verify_locations()\fR specifies the locations for \fBctx\fR, at
+which \s-1CA\s0 certificates for verification purposes are located. The certificates
+available via \fBCAfile\fR and \fBCApath\fR are trusted.
+.SH "NOTES"
+.IX Header "NOTES"
+If \fBCAfile\fR is not \s-1NULL\s0, it points to a file of \s-1CA\s0 certificates in \s-1PEM\s0
+format. The file can contain several \s-1CA\s0 certificates identified by
+.PP
+.Vb 3
+\& -----BEGIN CERTIFICATE-----
+\& ... (CA certificate in base64 encoding) ...
+\& -----END CERTIFICATE-----
+.Ve
+sequences. Before, between, and after the certificates text is allowed
+which can be used e.g. for descriptions of the certificates.
+.PP
+The \fBCAfile\fR is processed on execution of the \fISSL_CTX_load_verify_locations()\fR
+function.
+.PP
+If \fBCApath\fR is not \s-1NULL\s0, it points to a directory containing \s-1CA\s0 certificates
+in \s-1PEM\s0 format. The files each contain one \s-1CA\s0 certificate. The files are
+looked up by the \s-1CA\s0 subject name hash value, which must hence be available.
+If more than one \s-1CA\s0 certificate with the same name hash value exist, the
+extension must be different (e.g. 9d66eef0.0, 9d66eef0.1 etc). The search
+is performed in the ordering of the extension number, regardless of other
+properties of the certificates.
+Use the \fBc_rehash\fR utility to create the necessary links.
+.PP
+The certificates in \fBCApath\fR 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 \s-1CA\s0 certificates, the OpenSSL library will first search the
+certificates in \fBCAfile\fR, then those in \fBCApath\fR. 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 \fBCAfile\fR or \fBCApath\fR and must
+explicitly be set using the
+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 \fBCAfile\fR/\fBCApath\fR, if the
+certificate chain was not explicitly specified (see
+SSL_CTX_add_extra_chain_cert(3),
+SSL_CTX_use_certificate(3).
+.SH "WARNINGS"
+.IX Header "WARNINGS"
+If several \s-1CA\s0 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 \s-1CA\s0 certificate is available
+with different expiration dates. If a \*(L"certificate expired\*(R" verification
+error occurs, no other certificate will be searched. Make sure to not
+have expired certificates mixed with valid ones.
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+Generate a \s-1CA\s0 certificate file with descriptive text from the \s-1CA\s0 certificates
+ca1.pem ca2.pem ca3.pem:
+.PP
+.Vb 5
+\& #!/bin/sh
+\& rm CAfile.pem
+\& for i in ca1.pem ca2.pem ca3.pem ; do
+\&   openssl x509 -in $i -text >> CAfile.pem
+\& done
+.Ve
+Prepare the directory /some/where/certs containing several \s-1CA\s0 certificates
+for use as \fBCApath\fR:
+.PP
+.Vb 2
+\& cd /some/where/certs
+\& c_rehash .
+.Ve
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+The following return values can occur:
+.Ip "0" 4
+The operation failed because \fBCAfile\fR and \fBCApath\fR are \s-1NULL\s0 or the
+processing at one of the locations specified failed. Check the error
+stack to find out the reason.
+.Ip "1" 4
+.IX Item "1"
+The operation succeeded.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ssl(3),
+SSL_CTX_set_client_CA_list(3),
+SSL_get_client_CA_list(3),
+SSL_CTX_use_certificate(3),
+SSL_CTX_add_extra_chain_cert(3),
+SSL_CTX_set_cert_store(3)