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Code Issues Releases Wiki Activity

ircd::net::acceptor: Add callback stack framework for dynamic server name identification.

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This commit is contained in:
Jason Volk 2019-03-13 12:05:57 -07:00
parent 641a5546ae
commit cb979d96e7
2 changed files with 90 additions and 0 deletions
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2
include/ircd/net/acceptor.h
View file

@ -24,6 +24,7 @@ struct ircd::net::acceptor
using proffer = listener::proffer;
IRCD_EXCEPTION(listener::error, error)
IRCD_EXCEPTION(error, sni_warning)
static log::log log;
static conf::item<milliseconds> timeout;
@ -48,6 +49,7 @@ struct ircd::net::acceptor
void configure(const json::object &opts);
// Handshake stack
bool handle_sni(SSL &, int &ad);
void check_handshake_error(const error_code &ec, socket &);
void handshake(const error_code &ec, std::shared_ptr<socket>, std::weak_ptr<acceptor>) noexcept;

88
ircd/net.cc
View file

@ -1530,6 +1530,91 @@ ircd::net::acceptor::check_handshake_error(const error_code &ec,
throw_system_error(ec);
}
bool
ircd::net::acceptor::handle_sni(SSL &ssl,
int &ad)
try
{
const string_view &name
{
openssl::server_name(ssl)
};
log::debug
{
log, "%s offered SNI '%s'",
string(logheadbuf, *this),
name
};
if(!name)
return false;
return true;
}
catch(const sni_warning &e)
{
log::warning
{
log, "%s during SNI :%s",
string(logheadbuf, *this),
e.what()
};
throw;
}
catch(const std::exception &e)
{
log::error
{
log, "%s during SNI :%s",
string(logheadbuf, *this),
e.what()
};
throw;
}
static int
ircd_net_acceptor_handle_sni(SSL *const s,
int *const i,
void *const a)
noexcept try
{
if(unlikely(!s || !i || !a))
throw ircd::panic
{
"Missing arguments to callback s:%p i:%p a:%p", s, i, a
};
auto &acceptor
{
*reinterpret_cast<ircd::net::acceptor *>(a)
};
return acceptor.handle_sni(*s, *i)?
SSL_TLSEXT_ERR_OK:
SSL_TLSEXT_ERR_NOACK;
}
catch(const ircd::net::acceptor::sni_warning &)
{
return SSL_TLSEXT_ERR_ALERT_WARNING;
}
catch(const std::exception &)
{
return SSL_TLSEXT_ERR_ALERT_FATAL;
}
catch(...)
{
ircd::log::critical
{
ircd::net::acceptor::log,
"Acceptor SNI callback unhandled."
};
throw;
}
void
ircd::net::acceptor::configure(const json::object &opts)
{
@ -1742,6 +1827,9 @@ ircd::net::acceptor::configure(const json::object &opts)
assert(0);
return "foobar";
});
SSL_CTX_set_tlsext_servername_callback(ssl.native_handle(), ircd_net_acceptor_handle_sni);
SSL_CTX_set_tlsext_servername_arg(ssl.native_handle(), this);
}
//