Cryptography and SSL/TLS Toolkit



SSL_CTX_set_cert_store, SSL_CTX_set1_cert_store, SSL_CTX_get_cert_store - manipulate X509 certificate verification storage


 #include <openssl/ssl.h>

 void SSL_CTX_set_cert_store(SSL_CTX *ctx, X509_STORE *store);
 void SSL_CTX_set1_cert_store(SSL_CTX *ctx, X509_STORE *store);
 X509_STORE *SSL_CTX_get_cert_store(const SSL_CTX *ctx);


SSL_CTX_set_cert_store() sets/replaces the certificate verification storage of ctx to/with store. If another X509_STORE object is currently set in ctx, it will be X509_STORE_free()ed.

SSL_CTX_set1_cert_store() sets/replaces the certificate verification storage of ctx to/with store. The store's reference count is incremented. If another X509_STORE object is currently set in ctx, it will be X509_STORE_free()ed.

SSL_CTX_get_cert_store() returns a pointer to the current certificate verification storage.


In order to verify the certificates presented by the peer, trusted CA certificates must be accessed. These CA certificates are made available via lookup methods, handled inside the X509_STORE. From the X509_STORE the X509_STORE_CTX used when verifying certificates is created.

Typically the trusted certificate store is handled indirectly via using SSL_CTX_load_verify_locations(3). Using the SSL_CTX_set_cert_store() and SSL_CTX_get_cert_store() functions it is possible to manipulate the X509_STORE object beyond the SSL_CTX_load_verify_locations(3) call.

Currently no detailed documentation on how to use the X509_STORE object is available. Not all members of the X509_STORE are used when the verification takes place. So will e.g. the verify_callback() be overridden with the verify_callback() set via the SSL_CTX_set_verify(3) family of functions. This document must therefore be updated when documentation about the X509_STORE object and its handling becomes available.

SSL_CTX_set_cert_store() does not increment the store's reference count, so it should not be used to assign an X509_STORE that is owned by another SSL_CTX.

To share X509_STOREs between two SSL_CTXs, use SSL_CTX_get_cert_store() to get the X509_STORE from the first SSL_CTX, and then use SSL_CTX_set1_cert_store() to assign to the second SSL_CTX and increment the reference count of the X509_STORE.


The X509_STORE structure used by an SSL_CTX is used for verifying peer certificates and building certificate chains, it is also shared by every child SSL structure. Applications wanting finer control can use functions such as SSL_CTX_set1_verify_cert_store() instead.


SSL_CTX_set_cert_store() does not return diagnostic output.

SSL_CTX_set1_cert_store() does not return diagnostic output.

SSL_CTX_get_cert_store() returns the current setting.


ssl(7), SSL_CTX_load_verify_locations(3), SSL_CTX_set_verify(3)

Copyright 2001-2016 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at