NAME

       gnutls_certificate_verify_peers3 - API function

SYNOPSIS

       #include <gnutls/gnutls.h>

       int  gnutls_certificate_verify_peers3(gnutls_session_t  session,  const  char  * hostname, unsigned int *
       status);

ARGUMENTS

       gnutls_session_t session
                   is a gnutls session

       const char * hostname
                   is the expected name of the peer; may be NULL

       unsigned int * status
                   is the output of the verification

DESCRIPTION

       This function will verify the peer's certificate and store the the status in the  status  variable  as  a
       bitwise  OR  of gnutls_certificate_status_t values or zero if the certificate is trusted. Note that value
       in  status is set only when the return value of this  function  is  success  (i.e,  failure  to  trust  a
       certificate  does  not  imply  a  negative  return  value).   The default verification flags used by this
       function  can  be  overridden  using  gnutls_certificate_set_verify_flags().  See  the  documentation  of
       gnutls_certificate_verify_peers2() for details in the verification process.

       This  function  will  take  into  account  the  stapled OCSP responses sent by the server, as well as the
       following X.509 certificate extensions: Name Constraints, Key Usage, and Basic Constraints (pathlen).

       If the  hostname provided is non-NULL then this function will compare the  hostname  in  the  certificate
       against  it.  The  comparison  will  follow  the  RFC6125  recommendations.  If  names  do  not match the
       GNUTLS_CERT_UNEXPECTED_OWNER status flag will be set.

       In order to verify the purpose  of  the  end-certificate  (by  checking  the  extended  key  usage),  use
       gnutls_certificate_verify_peers().

       To avoid denial of service attacks some default upper limits regarding the certificate key size and chain
       size are set. To override them use gnutls_certificate_set_verify_limits().

       Note that when using raw public-keys verification  will  not  work  because  there  is  no  corresponding
       certificate  body  belonging  to the raw key that can be verified. In that case this function will return
       GNUTLS_E_INVALID_REQUEST.

RETURNS

       GNUTLS_E_SUCCESS (0) when the validation is performed, or a negative error code otherwise.  A  successful
       error code means that the  status parameter must be checked to obtain the validation status.

SINCE

       3.1.4

REPORTING BUGS

       Report bugs to <bugs@gnutls.org>.
       Home page: https://www.gnutls.org

COPYRIGHT

       Copyright © 2001-2023 Free Software Foundation, Inc., and others.
       Copying  and distribution of this file, with or without modification, are permitted in any medium without
       royalty provided the copyright notice and this notice are preserved.

SEE ALSO

       The full documentation for gnutls is maintained as  a  Texinfo  manual.   If  the  /usr/share/doc/gnutls/
       directory does not contain the HTML form visit

       https://www.gnutls.org/manual/