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131 .IX Title "SSL_CTX_set_max_cert_list 3"
132 .TH SSL_CTX_set_max_cert_list 3 "2017-12-07" "1.0.2n" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 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
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& long SSL_CTX_set_max_cert_list(SSL_CTX *ctx, long size);
145 \& long SSL_CTX_get_max_cert_list(SSL_CTX *ctx);
147 \& long SSL_set_max_cert_list(SSL *ssl, long size);
148 \& long SSL_get_max_cert_list(SSL *ctx);
151 .IX Header "DESCRIPTION"
152 \&\fISSL_CTX_set_max_cert_list()\fR sets the maximum size allowed for the peer's
153 certificate chain for all \s-1SSL\s0 objects created from \fBctx\fR to be <size> bytes.
154 The \s-1SSL\s0 objects inherit the setting valid for \fBctx\fR at the time
155 \&\fISSL_new\fR\|(3) is being called.
157 \&\fISSL_CTX_get_max_cert_list()\fR returns the currently set maximum size for \fBctx\fR.
159 \&\fISSL_set_max_cert_list()\fR sets the maximum size allowed for the peer's
160 certificate chain for \fBssl\fR to be <size> bytes. This setting stays valid
161 until a new value is set.
163 \&\fISSL_get_max_cert_list()\fR returns the currently set maximum size for \fBssl\fR.
166 During the handshake process, the peer may send a certificate chain.
167 The \s-1TLS/SSL\s0 standard does not give any maximum size of the certificate chain.
168 The OpenSSL library handles incoming data by a dynamically allocated buffer.
169 In order to prevent this buffer from growing without bounds due to data
170 received from a faulty or malicious peer, a maximum size for the certificate
173 The default value for the maximum certificate chain size is 100kB (30kB
174 on the 16bit \s-1DOS\s0 platform). This should be sufficient for usual certificate
175 chains (OpenSSL's default maximum chain length is 10, see
176 \&\fISSL_CTX_set_verify\fR\|(3), and certificates
177 without special extensions have a typical size of 1\-2kB).
179 For special applications it can be necessary to extend the maximum certificate
180 chain size allowed to be sent by the peer, see e.g. the work on
181 \&\*(L"Internet X.509 Public Key Infrastructure Proxy Certificate Profile\*(R"
182 and \*(L"\s-1TLS\s0 Delegation Protocol\*(R" at http://www.ietf.org/ and
183 http://www.globus.org/ .
185 Under normal conditions it should never be necessary to set a value smaller
186 than the default, as the buffer is handled dynamically and only uses the
187 memory actually required by the data sent by the peer.
189 If the maximum certificate chain size allowed is exceeded, the handshake will
190 fail with a \s-1SSL_R_EXCESSIVE_MESSAGE_SIZE\s0 error.
192 .IX Header "RETURN VALUES"
193 \&\fISSL_CTX_set_max_cert_list()\fR and \fISSL_set_max_cert_list()\fR return the previously
196 \&\fISSL_CTX_get_max_cert_list()\fR and \fISSL_get_max_cert_list()\fR return the currently
199 .IX Header "SEE ALSO"
200 \&\fIssl\fR\|(3), \fISSL_new\fR\|(3),
201 \&\fISSL_CTX_set_verify\fR\|(3)
204 SSL*_set/\fIget_max_cert_list()\fR have been introduced in OpenSSL 0.9.7.