Hi,
On 21-09-17 19:15, Antonio Quartulli wrote:
> On 15/09/17 05:34, Steffan Karger wrote:
>> diff --git a/src/openvpn/pf.c b/src/openvpn/pf.c
>> index 5cb002b..5fe1734 100644
>> --- a/src/openvpn/pf.c
>> +++ b/src/openvpn/pf.c
>> @@ -639,10 +639,10 @@ pf_init_context(struct context *c)
>> }
>> #endif
>> }
>> - else
>> - {
>> - msg(M_WARN, "WARNING: OPENVPN_PLUGIN_ENABLE_PF disabled");
>> - }
>
> Why removing this chunk above? Isn't that supposed to be printed when
> the init function of the plugin fails?
Because it's no longer true; instead of disabling the firewall, we will
now reject the connection. I tried to explain that in the commit message:
> On 15/09/17 05:34, Steffan Karger wrote:
>> Note that this changes the behavior for pf plugins: instead of just not
>> initializing the firewall rules and happily continuing, this now rejects
>> the client in the case of an (unlikely) failure to initialize the pf.
I think rejecting a client is the sensible thing to do when initializing
the firewall failed. (Rather than accepting the client and not
enforcing the firewall rules.)
>> + }
>> + if (!c->c2.pf.enabled)
>> + {
>> + register_signal(c, SIGUSR1, "plugin-pf-init-failed");
>> }
>
> Maybe it's just me missing how the signaling part really works, but what
> happens on the server when the SIGUSR1 is delivered? And why registering
> the signal when PF is disabled? I am missing something I think...
This registers a SIGUSR1 on the instance context, not the top-level
context. This leads to an instance reset. See e.g. check_tls_errors(),
which does the same in case of an error (or even uses SIGTERM, if
--tls-exit is used).
Registering a signal is how error reporting is this part of the code works.
>> }
>> #endif /* ifdef PLUGIN_PF */
>> diff --git a/src/openvpn/ssl_verify.c b/src/openvpn/ssl_verify.c
>> index 9cd36d7..df2736c 100644
>> --- a/src/openvpn/ssl_verify.c
>> +++ b/src/openvpn/ssl_verify.c
>> @@ -547,14 +547,14 @@ verify_cert_export_cert(openvpn_x509_cert_t *peercert,
>> const char *tmp_dir, stru
>> FILE *peercert_file;
>> const char *peercert_filename = "";
>>
>> - if (!tmp_dir)
>> + /* create tmp file to store peer cert */
>> + if (!tmp_dir ||
>> + !(peercert_filename = create_temp_file(tmp_dir, "pcf", gc)))
>
> || at the beginning of the next line (as mentioned in my previous email)
Will do, once we agree on the above discussion points.
Hope this clarifies things.
-Steffan
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