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80.\" If the F register is turned on, we'll generate
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96.TH SSL_CTX_set_max_cert_list 3 "0.9.7d" "2/Sep/2004" "OpenSSL"
97.UC
98.if n .hy 0
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188.\}
189.rm #[ #] #H #V #F C
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190.SH "NAME"
191SSL_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
192.SH "SYNOPSIS"
a7d27d5a 193.PP
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194.Vb 1
195\& #include <openssl/ssl.h>
196.Ve
197.Vb 2
198\& long SSL_CTX_set_max_cert_list(SSL_CTX *ctx, long size);
199\& long SSL_CTX_get_max_cert_list(SSL_CTX *ctx);
200.Ve
201.Vb 2
202\& long SSL_set_max_cert_list(SSL *ssl, long size);
203\& long SSL_get_max_cert_list(SSL *ctx);
204.Ve
205.SH "DESCRIPTION"
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206\fISSL_CTX_set_max_cert_list()\fR sets the maximum size allowed for the peer's
207certificate chain for all SSL objects created from \fBctx\fR to be <size> bytes.
208The SSL objects inherit the setting valid for \fBctx\fR at the time
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209SSL_new(3) is being called.
210.PP
a7d27d5a 211\fISSL_CTX_get_max_cert_list()\fR returns the currently set maximum size for \fBctx\fR.
984263bc 212.PP
a7d27d5a 213\fISSL_set_max_cert_list()\fR sets the maximum size allowed for the peer's
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214certificate chain for \fBssl\fR to be <size> bytes. This setting stays valid
215until a new value is set.
216.PP
a7d27d5a 217\fISSL_get_max_cert_list()\fR returns the currently set maximum size for \fBssl\fR.
984263bc 218.SH "NOTES"
984263bc 219During the handshake process, the peer may send a certificate chain.
a7d27d5a 220The TLS/SSL standard does not give any maximum size of the certificate chain.
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221The OpenSSL library handles incoming data by a dynamically allocated buffer.
222In order to prevent this buffer from growing without bounds due to data
223received from a faulty or malicious peer, a maximum size for the certificate
224chain is set.
225.PP
226The default value for the maximum certificate chain size is 100kB (30kB
a7d27d5a 227on the 16bit DOS platform). This should be sufficient for usual certificate
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228chains (OpenSSL's default maximum chain length is 10, see
229SSL_CTX_set_verify(3), and certificates
a7d27d5a 230without special extensions have a typical size of 1-2kB).
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231.PP
232For special applications it can be necessary to extend the maximum certificate
233chain size allowed to be sent by the peer, see e.g. the work on
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234\*(L"Internet X.509 Public Key Infrastructure Proxy Certificate Profile\*(R"
235and \*(L"TLS Delegation Protocol\*(R" at http://www.ietf.org/ and
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236http://www.globus.org/ .
237.PP
238Under normal conditions it should never be necessary to set a value smaller
239than the default, as the buffer is handled dynamically and only uses the
240memory actually required by the data sent by the peer.
241.PP
242If the maximum certificate chain size allowed is exceeded, the handshake will
a7d27d5a 243fail with a SSL_R_EXCESSIVE_MESSAGE_SIZE error.
984263bc 244.SH "RETURN VALUES"
a7d27d5a 245\fISSL_CTX_set_max_cert_list()\fR and \fISSL_set_max_cert_list()\fR return the previously
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246set value.
247.PP
a7d27d5a 248\fISSL_CTX_get_max_cert_list()\fR and \fISSL_get_max_cert_list()\fR return the currently
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249set value.
250.SH "SEE ALSO"
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251ssl(3), SSL_new(3),
252SSL_CTX_set_verify(3)
253.SH "HISTORY"
984263bc 254SSL*_set/\fIget_max_cert_list()\fR have been introduced in OpenSSL 0.9.7.
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255
256.rn }` ''
257.IX Title "SSL_CTX_set_max_cert_list 3"
258.IX 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"
259
260.IX Header "NAME"
261
262.IX Header "SYNOPSIS"
263
264.IX Header "DESCRIPTION"
265
266.IX Header "NOTES"
267
268.IX Header "RETURN VALUES"
269
270.IX Header "SEE ALSO"
271
272.IX Header "HISTORY"
273