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131 .IX Title "SSL_CTX_SET_CERT_CB 3"
132 .TH SSL_CTX_SET_CERT_CB 3 "2018-09-11" "1.1.1" "OpenSSL"
133 .\" For nroff, turn off justification. Always turn off hyphenation; it makes
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138 SSL_CTX_set_cert_cb, SSL_set_cert_cb \- handle certificate callback function
140 .IX Header "SYNOPSIS"
142 \& #include <openssl/ssl.h>
144 \& void SSL_CTX_set_cert_cb(SSL_CTX *c, int (*cert_cb)(SSL *ssl, void *arg),
146 \& void SSL_set_cert_cb(SSL *s, int (*cert_cb)(SSL *ssl, void *arg), void *arg);
148 \& int (*cert_cb)(SSL *ssl, void *arg);
151 .IX Header "DESCRIPTION"
152 \&\fISSL_CTX_set_cert_cb()\fR and \fISSL_set_cert_cb()\fR sets the \fIcert_cb()\fR callback,
153 \&\fBarg\fR value is pointer which is passed to the application callback.
155 When \fIcert_cb()\fR is \s-1NULL,\s0 no callback function is used.
157 \&\fIcert_cb()\fR is the application defined callback. It is called before a
158 certificate will be used by a client or server. The callback can then inspect
159 the passed \fBssl\fR structure and set or clear any appropriate certificates. If
160 the callback is successful it \fB\s-1MUST\s0\fR return 1 even if no certificates have
161 been set. A zero is returned on error which will abort the handshake with a
162 fatal internal error alert. A negative return value will suspend the handshake
163 and the handshake function will return immediately.
164 \&\fISSL_get_error\fR\|(3) will return \s-1SSL_ERROR_WANT_X509_LOOKUP\s0 to
165 indicate, that the handshake was suspended. The next call to the handshake
166 function will again lead to the call of \fIcert_cb()\fR. It is the job of the
167 \&\fIcert_cb()\fR to store information about the state of the last call,
168 if required to continue.
171 An application will typically call \fISSL_use_certificate()\fR and
172 \&\fISSL_use_PrivateKey()\fR to set the end entity certificate and private key.
173 It can add intermediate and optionally the root \s-1CA\s0 certificates using
174 \&\fISSL_add1_chain_cert()\fR.
176 It might also call \fISSL_certs_clear()\fR to delete any certificates associated
177 with the \fB\s-1SSL\s0\fR object.
179 The certificate callback functionality supersedes the (largely broken)
180 functionality provided by the old client certificate callback interface.
181 It is \fBalways\fR called even is a certificate is already set so the callback
182 can modify or delete the existing certificate.
184 A more advanced callback might examine the handshake parameters and set
185 whatever chain is appropriate. For example a legacy client supporting only
186 TLSv1.0 might receive a certificate chain signed using \s-1SHA1\s0 whereas a
187 TLSv1.2 or later client which advertises support for \s-1SHA256\s0 could receive a
188 chain using \s-1SHA256.\s0
190 Normal server sanity checks are performed on any certificates set
191 by the callback. So if an \s-1EC\s0 chain is set for a curve the client does not
192 support it will \fBnot\fR be used.
194 .IX Header "RETURN VALUES"
195 \&\fISSL_CTX_set_cert_cb()\fR and \fISSL_set_cert_cb()\fR do not return values.
197 .IX Header "SEE ALSO"
198 \&\fIssl\fR\|(7), \fISSL_use_certificate\fR\|(3),
199 \&\fISSL_add1_chain_cert\fR\|(3),
200 \&\fISSL_get_client_CA_list\fR\|(3),
201 \&\fISSL_clear\fR\|(3), \fISSL_free\fR\|(3)
203 .IX Header "COPYRIGHT"
204 Copyright 2014\-2018 The OpenSSL Project Authors. All Rights Reserved.
206 Licensed under the OpenSSL license (the \*(L"License\*(R"). You may not use
207 this file except in compliance with the License. You can obtain a copy
208 in the file \s-1LICENSE\s0 in the source distribution or at
209 <https://www.openssl.org/source/license.html>.