[1/2] ovpnmain.cgi: Fixes Bug#13137 - Existing n2n client connection created with openssl-1.1.1x fails to start with openssl-3.x

  - With a n2n connection .p12 certificate created wityh openssl-1.1.1x the line
   providers legacy default is required in the n2nconf file to enable it to start.
- Any openssl-3.x attempt to open a .p12 file created with openssl-1.1.1x will result in
   a failure and an error message. All the openssl commands dealing with pkcs12 (.p12)
   files need to have the -legacy option added to them.

Fixes: Bug#13137
Tested-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
---
 html/cgi-bin/ovpnmain.cgi | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)
  

Hello Adolf,

Thank you very much for putting all this effort in to solve such an annoying problem.

> On 4 Jun 2023, at 19:57, Adolf Belka <adolf.belka@ipfire.org> wrote:
> 
> - With a n2n connection .p12 certificate created wityh openssl-1.1.1x the line
>   providers legacy default is required in the n2nconf file to enable it to start.
> - Any openssl-3.x attempt to open a .p12 file created with openssl-1.1.1x will result in
>   a failure and an error message. All the openssl commands dealing with pkcs12 (.p12)
>   files need to have the -legacy option added to them.
> 
> Fixes: Bug#13137
> Tested-by: Adolf Belka <adolf.belka@ipfire.org>
> Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
> ---
> html/cgi-bin/ovpnmain.cgi | 11 +++++++----
> 1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/html/cgi-bin/ovpnmain.cgi b/html/cgi-bin/ovpnmain.cgi
> index 5c4fad0a5..88106251e 100755
> --- a/html/cgi-bin/ovpnmain.cgi
> +++ b/html/cgi-bin/ovpnmain.cgi
> @@ -1115,6 +1115,7 @@ unless(-d "${General::swroot}/ovpn/n2nconf/$cgiparams{'NAME'}"){mkdir "${General
>   print CLIENTCONF "# Activate Management Interface and Port\n";
>   if ($cgiparams{'OVPN_MGMT'} eq '') {print CLIENTCONF "management localhost $cgiparams{'DEST_PORT'}\n"}
>   else {print CLIENTCONF "management localhost $cgiparams{'OVPN_MGMT'}\n"};
> +  print CLIENTCONF "providers legacy default\n";
>   close(CLIENTCONF);
> 
> }
> @@ -1648,7 +1649,7 @@ END
> goto ROOTCERT_ERROR;
>    }
> } else { # child
> -    unless (exec ('/usr/bin/openssl', 'pkcs12', '-cacerts', '-nokeys',
> +    unless (exec ('/usr/bin/openssl', 'pkcs12', '-legacy', '-cacerts', '-nokeys',
>    '-in', $filename,
>    '-out', "$tempdir/cacert.pem")) {
> $errormessage = "$Lang::tr{'cant start openssl'}: $!";
> @@ -1671,7 +1672,7 @@ END
> goto ROOTCERT_ERROR;
>    }
> } else { # child
> -    unless (exec ('/usr/bin/openssl', 'pkcs12', '-clcerts', '-nokeys',
> +    unless (exec ('/usr/bin/openssl', 'pkcs12', '-legacy', '-clcerts', '-nokeys',
>    '-in', $filename,
>    '-out', "$tempdir/hostcert.pem")) {
> $errormessage = "$Lang::tr{'cant start openssl'}: $!";
> @@ -1694,7 +1695,7 @@ END
> goto ROOTCERT_ERROR;
>    }
> } else { # child
> -    unless (exec ('/usr/bin/openssl', 'pkcs12', '-nocerts',
> +    unless (exec ('/usr/bin/openssl', 'pkcs12', '-legacy', '-nocerts',
>    '-nodes',
>    '-in', $filename,
>    '-out', "$tempdir/serverkey.pem")) {
> @@ -2156,6 +2157,7 @@ if ($confighash{$cgiparams{'KEY'}}[3] eq 'net'){
>    if ($confighash{$cgiparams{'KEY'}}[22] eq '') {print CLIENTCONF "management localhost $confighash{$cgiparams{'KEY'}}[29]\n"}
>     else {print CLIENTCONF "management localhost $confighash{$cgiparams{'KEY'}}[22]\n"};
>    print CLIENTCONF "# remsub $confighash{$cgiparams{'KEY'}}[11]\n";
> +   print CLIENTCONF "providers legacy default\n";
> 
> 
>     close(CLIENTCONF);
> @@ -3296,6 +3298,7 @@ END
> print FILE "# Logfile\n";
> print FILE "status-version 1\n";
> print FILE "status /var/run/openvpn/$n2nname[0]-n2n 10\n";
> + print FILE "providers legacy default\n";
> close FILE;

I just wanted to highlight that I believe that we won’t be dropping this line any time soon. Hopefully that won’t become a problem once distributions decide to no longer ship the legacy module - or if it gets removed from OpenSSL entirely.

I believe that at this point we have no other options.

Reviewed-by: Michael Tremer <michael.tremer@ipfire.org>

> unless(move("$tempdir/$uplconffilename", "${General::swroot}/ovpn/n2nconf/$n2nname[0]/$uplconffilename2")) {
> @@ -4242,7 +4245,7 @@ if ($cgiparams{'TYPE'} eq 'net') {
> 
>    # Create the pkcs12 file
>    # The system call is safe, because all arguments are passed as an array.
> -    system('/usr/bin/openssl', 'pkcs12', '-export',
> +    system('/usr/bin/openssl', 'pkcs12', '-legacy', '-export',
> '-inkey', "${General::swroot}/ovpn/certs/$cgiparams{'NAME'}key.pem",
> '-in', "${General::swroot}/ovpn/certs/$cgiparams{'NAME'}cert.pem",
> '-name', $cgiparams{'NAME'},
> -- 
> 2.40.1
>