SSLCTXsetmaxcertlist(3) OpenSSL SSLCTXsetmaxcertlist(3)

NAME
       SSLCTXsetmaxcertlist, SSLCTXgetmaxcertlist,
       SSLsetmaxcertlist, SSLgetmaxcertlist, - manipulate allowed for
       the peer's certificate chain

SYNOPSIS
        #include 

        long SSLCTXsetmaxcertlist(SSLCTX *ctx, long size);
        long SSLCTXgetmaxcertlist(SSLCTX *ctx);

        long SSLsetmaxcertlist(SSL *ssl, long size);
        long SSLgetmaxcertlist(SSL *ctx);

DESCRIPTION
       SSLCTXsetmaxcertlist() sets the maximum size allowed for the
       peer's certificate chain for all SSL objects created from ccttxx to be
        bytes.  The SSL objects inherit the setting valid for ccttxx at the
       time SSLnew(3) is being called.

       SSLCTXgetmaxcertlist() returns the currently set maximum size for
       ccttxx.

       SSLsetmaxcertlist() sets the maximum size allowed for the peer's
       certificate chain for ssssll to be  bytes. This setting stays valid
       until a new value is set.

       SSLgetmaxcertlist() returns the currently set maximum size for ssssll.

NNOOTTEESS
       During the handshake process, the peer may send a certificate chain.
       The TLS/SSL standard does not give any maximum size of the certificate
       chain.  The OpenSSL library handles incoming data by a dynamically
       allocated buffer.  In order to prevent this buffer from growing without
       bounds due to data received from a faulty or malicious peer, a maximum
       size for the certificate chain is set.

       The default value for the maximum certificate chain size is 100kB (30kB
       on the 16bit DOS platform). This should be sufficient for usual
       certificate chains (OpenSSL's default maximum chain length is 10, see
       SSLCTXsetverify(3), and certificates without special extensions have
       a typical size of 1-2kB).

       For special applications it can be necessary to extend the maximum
       certificate chain size allowed to be sent by the peer, see e.g. the
       work on "Internet X.509 Public Key Infrastructure Proxy Certificate
       Profile" and "TLS Delegation Protocol" at http://www.ietf.org/ and
       http://www.globus.org/ .

       Under normal conditions it should never be necessary to set a value
       smaller than the default, as the buffer is handled dynamically and only
       uses the memory actually required by the data sent by the peer.

       If the maximum certificate chain size allowed is exceeded, the
       handshake will fail with a SSLREXCESSIVEMESSAGESIZE error.

RETURN VALUES
       SSLCTXsetmaxcertlist() and SSLsetmaxcertlist() return the
       previously set value.

       SSLCTXgetmaxcertlist() and SSLgetmaxcertlist() return the
       currently set value.

SEE ALSO
       ssl(3), SSLnew(3), SSLCTXsetverify(3)

HISTORY       SSL*set/getmaxcertlist() have been introduced in OpenSSL 0.9.7.



0.9.7l                            2001-09-11      SSLCTXsetmaxcertlist(3)