Manual Pages for UNIX Operating System command usage for man SSL_CTX_load_verify_locations

OpenSSL                   SSL_CTX_load_verify_locations(3openssl)



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     SSL_CTX_load_verify_locations - set default locations for
     trusted CA certificates

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      #include 

      int SSL_CTX_load_verify_locations(SSL_CTX *ctx, const char *CAfile,
                                        const char *CApath);


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     SSL_CTX_load_verify_locations() specifies the locations for
     ccccttttxxxx, at which CA certificates for verification purposes are
     located. The certificates available via CCCCAAAAffffiiiilllleeee and CCCCAAAAppppaaaatttthhhh
     are trusted.

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     If CCCCAAAAffffiiiilllleeee is not NULL, it points to a file of CA
     certificates in PEM format. The file can contain several CA
     certificates identified by

      -----BEGIN CERTIFICATE-----
      ... (CA certificate in base64 encoding) ...
      -----END CERTIFICATE-----

     sequences. Before, between, and after the certificates text
     is allowed which can be used e.g. for descriptions of the
     certificates.

     The CCCCAAAAffffiiiilllleeee is processed on execution of the
     SSL_CTX_load_verify_locations() function.

     If CCCCAAAAppppaaaatttthhhh is not NULL, it points to a directory containing
     CA certificates in PEM format. The files each contain one CA
     certificate. The files are looked up by the CA subject name
     hash value, which must hence be available.  If more than one
     CA certificate with the same name hash value exist, the
     extension must be different (e.g. 9d66eef0.0, 9d66eef0.1
     etc). The search is performed in the ordering of the
     extension number, regardless of other properties of the
     certificates.  Use the cccc_rrrreeeehhhhaaaasssshhhh utility to create the
     necessary links.

     The certificates in CCCCAAAAppppaaaatttthhhh are only looked up when required,
     e.g. when building the certificate chain or when actually
     performing the verification of a peer certificate.

     When looking up CA certificates, the OpenSSL library will
     first search the certificates in CCCCAAAAffffiiiilllleeee, then those in
     CCCCAAAAppppaaaatttthhhh. Certificate matching is done based on the subject
     name, the key identifier (if present), and the serial number



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OpenSSL                   SSL_CTX_load_verify_locations(3openssl)



     as taken from the certificate to be verified. If these data
     do not match, the next certificate will be tried. If a first
     certificate matching the parameters is found, the
     verification process will be performed; no other
     certificates for the same parameters will be searched in
     case of failure.

     In server mode, when requesting a client certificate, the
     server must send the list of CAs of which it will accept
     client certificates. This list is not influenced by the
     contents of CCCCAAAAffffiiiilllleeee or CCCCAAAAppppaaaatttthhhh and must explicitly be set
     using the SSL_CTX_set_client_CA_list(3) family of functions.

     When building its own certificate chain, an OpenSSL
     client/server will try to fill in missing certificates from
     CCCCAAAAffffiiiilllleeee/CCCCAAAAppppaaaatttthhhh, if the certificate chain was not explicitly
     specified (see SSL_CTX_add_extra_chain_cert(3),
     SSL_CTX_use_certificate(3).

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     If several CA certificates matching the name, key
     identifier, and serial number condition are available, only
     the first one will be examined. This may lead to unexpected
     results if the same CA certificate is available with
     different expiration dates. If a "certificate expired"
     verification error occurs, no other certificate will be
     searched. Make sure to not have expired certificates mixed
     with valid ones.

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     Generate a CA certificate file with descriptive text from
     the CA certificates ca1.pem ca2.pem ca3.pem:

      #!/bin/sh
      rm CAfile.pem
      for i in ca1.pem ca2.pem ca3.pem ; do
        openssl x509 -in $i -text >> CAfile.pem
      done

     Prepare the directory /some/where/certs containing several
     CA certificates for use as CCCCAAAAppppaaaatttthhhh:

      cd /some/where/certs
      c_rehash .


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     The following return values can occur:

     0   The operation failed because CCCCAAAAffffiiiilllleeee and CCCCAAAAppppaaaatttthhhh are NULL
         or the processing at one of the locations specified
         failed. Check the error stack to find out the reason.



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OpenSSL                   SSL_CTX_load_verify_locations(3openssl)



     1   The operation succeeded.

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     ssl(3), SSL_CTX_set_client_CA_list(3),
     SSL_get_client_CA_list(3), SSL_CTX_use_certificate(3),
     SSL_CTX_add_extra_chain_cert(3), SSL_CTX_set_cert_store(3)

















































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