Hi! I have the same task to do and the same problem. I am trying to verify ssl sertificate using Net::SSLeay.

As input I have certificate in PEM format and path to the directory with root and intermediate certificates. I read about doing the verification in C (https://www.ibm.com/developerworks/library/l-openssl/), but I can't find equivalents of called C functions. This is what I did:

my $s_cert_filename = '/path/to/cert/mycert.pem';
my $s_chain_dir = '/path/to/root_and_itermediate/certs/';

#Initialization, because I read about it in cpan
my $rv = Net::SSLeay::library_init(); 
if($rv != 1) {die 'library init'};
Net::SSLeay::load_error_strings();
Net::SSLeay::SSLeay_add_ssl_algorithms();

#Create $ctx object
my $ctx = Net::SSLeay::CTX_new or die;

#Set where are root and intermediate certs
Net::SSLeay::CTX_load_verify_locations($ctx, '', $s_chain_dir)  
or die_now("CTX load verify loc=`$s_chain_dir' $!");

#Set where is the certificate to be checked
$rv = Net::SSLeay::CTX_use_certificate_file($ctx, $s_filename, 
&Net::SSLeay::FILETYPE_PEM);
if($rv != 1) {die 'CTX_use_certificate_file'}

#Create $ssl object from $ctx object
my $ssl = Net::SSLeay::new($ctx);

#Try to get verification result
$rv = Net::SSLeay::get_verify_result($ssl);
    
print $rv;
[download]

Result is always '0' which means this is valid certificate. The problem is that I tried with both – valid and invalid certificate, and the result is always '0'.

Net::SSLeay::CTX_free($ctx);

Also I read that it's not verifying the certificate, but something called x509_store, so I found other example in C (http://stackoverflow.com/questions/2756553/x509-certificate-verification-in-c). I tryed to translate it to perl:

my $s_cert_filename = '/path/to/cert/mycert.pem';
    
my $s_chain_dir = '/path/to/root_and_itermediate/certs/';

#Initialization
my $rv = Net::SSLeay::library_init(); 
 if($rv != 1) {die 'library init'};
Net::SSLeay::ERR_load_SSL_strings();
Net::SSLeay::SSLeay_add_ssl_algorithms();

#Create $ctx object
my $ctx = Net::SSLeay::CTX_new() or
 die_now("Failed to create SSL_CTX $!");

#Set where are root and intermediate certs
Net::SSLeay::CTX_load_verify_locations($ctx, '', $s_chain_dir)  or
 die_now("CTX load verify loc=`$s_chain_dir' $!");

#Create $ssl object from $ctx object
my $ssl = Net::SSLeay::new($ctx);

#Set where is the certificate to be checked

$rv = Net::SSLeay::use_certificate_file($ssl, $s_filename,
 &Net::SSLeay::FILETYPE_PEM);

#get x509_store    and set flag – to check crl
my $x509_store = Net::SSLeay::CTX_get_cert_store($ssl);
    
Net::SSLeay::X509_STORE_set_flags($ctx, 
&Net::SSLeay::X509_V_FLAG_CRL_CHECK);

#Try to get verification result
$rv = Net::SSLeay::get_verify_result($ssl);
print $rv;
[download]

Result is the same – always '0'.

Net::SSLeay::CTX_free($ctx);
[download]

I think the problem is somewhere in the usage of those strange data structures and 'get_verify_result' returns '0' to show me that there is an error. I don't know what I am doing wrong. Could someone help me?

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