1SSL_CTX_SET_MAX_CERT_LIST(3ossl)    OpenSSL   SSL_CTX_SET_MAX_CERT_LIST(3ossl)
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NAME

6       SSL_CTX_set_max_cert_list, SSL_CTX_get_max_cert_list,
7       SSL_set_max_cert_list, SSL_get_max_cert_list - manipulate allowed size
8       for the peer's certificate chain
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SYNOPSIS

11        #include <openssl/ssl.h>
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13        long SSL_CTX_set_max_cert_list(SSL_CTX *ctx, long size);
14        long SSL_CTX_get_max_cert_list(SSL_CTX *ctx);
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16        long SSL_set_max_cert_list(SSL *ssl, long size);
17        long SSL_get_max_cert_list(SSL *ctx);
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DESCRIPTION

20       SSL_CTX_set_max_cert_list() sets the maximum size allowed for the
21       peer's certificate chain for all SSL objects created from ctx to be
22       <size> bytes.  The SSL objects inherit the setting valid for ctx at the
23       time SSL_new(3) is being called.
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25       SSL_CTX_get_max_cert_list() returns the currently set maximum size for
26       ctx.
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28       SSL_set_max_cert_list() sets the maximum size allowed for the peer's
29       certificate chain for ssl to be <size> bytes. This setting stays valid
30       until a new value is set.
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32       SSL_get_max_cert_list() returns the currently set maximum size for ssl.
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NOTES

35       During the handshake process, the peer may send a certificate chain.
36       The TLS/SSL standard does not give any maximum size of the certificate
37       chain.  The OpenSSL library handles incoming data by a dynamically
38       allocated buffer.  In order to prevent this buffer from growing without
39       bounds due to data received from a faulty or malicious peer, a maximum
40       size for the certificate chain is set.
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42       The default value for the maximum certificate chain size is 100kB (30kB
43       on the 16-bit DOS platform). This should be sufficient for usual
44       certificate chains (OpenSSL's default maximum chain length is 10, see
45       SSL_CTX_set_verify(3), and certificates without special extensions have
46       a typical size of 1-2kB).
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48       For special applications it can be necessary to extend the maximum
49       certificate chain size allowed to be sent by the peer, see e.g. the
50       work on "Internet X.509 Public Key Infrastructure Proxy Certificate
51       Profile" and "TLS Delegation Protocol" at http://www.ietf.org/ and
52       http://www.globus.org/ .
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54       Under normal conditions it should never be necessary to set a value
55       smaller than the default, as the buffer is handled dynamically and only
56       uses the memory actually required by the data sent by the peer.
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58       If the maximum certificate chain size allowed is exceeded, the
59       handshake will fail with a SSL_R_EXCESSIVE_MESSAGE_SIZE error.
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RETURN VALUES

62       SSL_CTX_set_max_cert_list() and SSL_set_max_cert_list() return the
63       previously set value.
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65       SSL_CTX_get_max_cert_list() and SSL_get_max_cert_list() return the
66       currently set value.
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SEE ALSO

69       ssl(7), SSL_new(3), SSL_CTX_set_verify(3)
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72       Copyright 2001-2020 The OpenSSL Project Authors. All Rights Reserved.
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74       Licensed under the Apache License 2.0 (the "License").  You may not use
75       this file except in compliance with the License.  You can obtain a copy
76       in the file LICENSE in the source distribution or at
77       <https://www.openssl.org/source/license.html>.
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813.1.1                             2023-08-31  SSL_CTX_SET_MAX_CERT_LIST(3ossl)
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