Manual Pages for UNIX Operating System command usage for man SSL_get_max_cert_list

OpenSSL                       SSL_CTX_set_max_cert_list(3openssl)



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     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

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      #include 

      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);


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

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

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

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

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     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



11/Sep/2001            Last change: 0.9.8o                      1






OpenSSL                       SSL_CTX_set_max_cert_list(3openssl)



     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.

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     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.

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     ssl(3), SSL_new(3), SSL_CTX_set_verify(3)

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






























11/Sep/2001            Last change: 0.9.8o                      2