SSL_CTX_load_verify_locationOpeSSL_CTX_load_verify_locations(3)





NAME
       SSL_CTX_load_verify_locations - set default locations
       for trusted CA certificates

SYNOPSIS
        #include <openssl/ssl.h>

        int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                                          const char *CApath);

DESCRIPTION
       SSL_CTX_load_verify_locations() specifies the locations
       for ctx, at which CA certificates for verification pur-
       poses are located. The certificates available via CAfile
       and CApath are trusted.

NOTES
       If CAfile is not NULL, it points to a file of CA cer-
       tificates in PEM format. The file can contain several CA
       certificates identified by

        -----BEGIN CERTIFICATE-----
        ... (CA certificate in base64 encoding) ...
        -----END CERTIFICATE-----

       sequences. Before, between, and after the certificates
       text is allowed which can be used e.g. for descriptions
       of the certificates.

       The CAfile is processed on execution of the
       SSL_CTX_load_verify_locations() function.

       If CApath is not NULL, it points to a directory contain-
       ing CA certificates in PEM format. The files each con-
       tain one CA certificate. The files are looked up by the
       CA subject name hash value, which must hence be avail-
       able.  If more than one CA certificate with the same
       name hash value exist, the extension must be different
       (e.g. 9d66eef0.0, 9d66eef0.1 etc). The search is per-
       formed in the ordering of the extension number, regard-
       less of other properties of the certificates.  Use the
       c_rehash utility to create the necessary links.

       The certificates in CApath are only looked up when
       required, e.g. when building the certificate chain or
       when actually performing the verification of a peer cer-
       tificate.

       When looking up CA certificates, the OpenSSL library
       will first search the certificates in CAfile, then those
       in 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 veri-
       fied. 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.

       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 CAfile or CApath and must explicitly
       be set using the SSL_CTX_set_client_CA_list(3) family of
       functions.

       When building its own certificate chain, an OpenSSL
       client/server will try to fill in missing certificates
       from CAfile/CApath, if the certificate chain was not
       explicitly specified (see
       SSL_CTX_add_extra_chain_cert(3), SSL_CTX_use_certifi-
       cate(3).

WARNINGS
       If several CA certificates matching the name, key iden-
       tifier, and serial number condition are available, only
       the first one will be examined. This may lead to unex-
       pected results if the same CA certificate is available
       with different expiration dates. If a "certificate
       expired" verification error occurs, no other certificate
       will be searched. Make sure to not have expired certifi-
       cates mixed with valid ones.

EXAMPLES
       Generate a CA certificate file with descriptive text
       from the CA certificates ca1.pem ca2.pem ca3.pem:

        #!/bin/sh
        rm CAfile.pem
        for i in ca1.pem ca2.pem ca3.pem ; do
          openssl x509 -in $i -text >> CAfile.pem
        done

       Prepare the directory /some/where/certs containing sev-
       eral CA certificates for use as CApath:

        cd /some/where/certs
        c_rehash .

RETURN VALUES
       The following return values can occur:

       o   The operation failed because CAfile and CApath are
           NULL or the processing at one of the locations spec-
           ified failed. Check the error stack to find out the
           reason.

       1   The operation succeeded.

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)



0.9.7c                     2001SSL_CTX_load_verify_locations(3)
