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     SSL_CTX_set_max_cert_list(3)p/2001 (0.9.7e)X_set_max_cert_list(3)


     NAME
          SSL_CTX_set_max_cert_list, SSL_CTX_get_max_cert_list,
          SSL_set_max_cert_list, SSL_get_max_cert_list, - manipulate
          allowed for the peer's certificate chain

     SYNOPSIS
           #include <openssl/ssl.h>

           long SSL_CTX_set_max_cert_list(SSL_CTX *ctx, long size);
           long SSL_CTX_get_max_cert_list(SSL_CTX *ctx);

           long SSL_set_max_cert_list(SSL *ssl, long size);
           long SSL_get_max_cert_list(SSL *ctx);


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

          SSL_CTX_get_max_cert_list() returns the currently set
          maximum size for ctx.

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

          SSL_get_max_cert_list() returns the currently set maximum
          size for ssl.

     NOTES
          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 SSL_CTX_set_verify(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 SSL_R_EXCESSIVE_MESSAGE_SIZE
          error.

     RETURN VALUES
          SSL_CTX_set_max_cert_list() and SSL_set_max_cert_list()
          return the previously set value.

          SSL_CTX_get_max_cert_list() and SSL_get_max_cert_list()
          return the currently set value.

     SEE ALSO
          ssl(3), SSL_new(3), SSL_CTX_set_verify(3)

     HISTORY
          SSL*_set/get_max_cert_list() have been introduced in OpenSSL
          0.9.7.


     Page 2                                         (printed 10/20/05)