/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2020 Matt Schatz <genius3000@g3k.solutions>
* Copyright (C) 2019 linuxdaemon <linuxdaemon.irc@gmail.com>
* Copyright (C) 2017 Wade Cline <wadecline@hotmail.com>
* Copyright (C) 2016 Adam <Adam@anope.org>
* Copyright (C) 2014 Julien Vehent <julien@linuxwall.info>
* Copyright (C) 2013-2014, 2016-2022 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2012-2017 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2012 ChrisTX <xpipe@hotmail.de>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
* Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
* Copyright (C) 2006-2008 Craig Edwards <brain@inspircd.org>
* Copyright (C) 2006 Oliver Lupton <om@inspircd.org>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
/// $CompilerFlags: find_compiler_flags("openssl" "")
/// $LinkerFlags: find_linker_flags("openssl" "-lssl -lcrypto")
/// $PackageInfo: require_system("arch") openssl pkgconf
/// $PackageInfo: require_system("centos") openssl-devel pkgconfig
/// $PackageInfo: require_system("darwin") openssl@1.1 pkg-config
/// $PackageInfo: require_system("debian") libssl-dev openssl pkg-config
/// $PackageInfo: require_system("rocky") openssl-devel pkgconfig
/// $PackageInfo: require_system("ubuntu") libssl-dev openssl pkg-config
#include "inspircd.h"
#include "iohook.h"
#include "modules/ssl.h"
#include <openssl/ssl.h>
#include <openssl/err.h>
#include <openssl/dh.h>
#ifdef _WIN32
# pragma comment(lib, "libcrypto.lib")
# pragma comment(lib, "libssl.lib")
#endif
#if OPENSSL_VERSION_NUMBER < 0x10101000L
# error OpenSSL 1.1.1 or newer is required by the ssl_openssl module.
#elif OPENSSL_VERSION_NUMBER < 0x30000000L
# define OPENSSL_VERSION_STR OPENSSL_VERSION_TEXT
# define OPENSSL_VERSION_STRING OPENSSL_VERSION
#else
# define INSPIRCD_OPENSSL_AUTO_DH
#endif
static bool SelfSigned = false;
static int exdataindex;
static Module* thismod;
char* get_error()
{
return ERR_error_string(ERR_get_error(), nullptr);
}
static int OnVerify(int preverify_ok, X509_STORE_CTX* ctx);
static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
namespace OpenSSL
{
class Exception final
: public ModuleException
{
public:
Exception(const std::string& msg)
: ModuleException(thismod, msg)
{
}
};
#ifndef INSPIRCD_OPENSSL_AUTO_DH
class DHParams final
{
DH* dh;
public:
DHParams(const std::string& filename)
{
BIO* dhpfile = BIO_new_file(filename.c_str(), "r");
if (!dhpfile)
throw Exception("Couldn't open DH file " + filename);
dh = PEM_read_bio_DHparams(dhpfile, nullptr, nullptr, nullptr);
BIO_free(dhpfile);
if (!dh)
throw Exception("Couldn't read DH params from file " + filename);
}
~DHParams()
{
DH_free(dh);
}
DH* get()
{
return dh;
}
};
#endif
class Context final
{
SSL_CTX* const ctx;
long ctx_options;
public:
Context(SSL_CTX* context)
: ctx(context)
{
// Sane default options for OpenSSL see https://www.openssl.org/docs/ssl/SSL_CTX_set_options.html
// and when choosing a cipher, use the server's preferences instead of the client preferences.
long opts = SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3 | SSL_OP_NO_TLSv1 | SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION | SSL_OP_CIPHER_SERVER_PREFERENCE | SSL_OP_SINGLE_DH_USE;
// Only turn options on if they exist
#ifdef SSL_OP_SINGLE_ECDH_USE
opts |= SSL_OP_SINGLE_ECDH_USE;
#endif
#ifdef SSL_OP_NO_TICKET
opts |= SSL_OP_NO_TICKET;
#endif
ctx_options = SSL_CTX_set_options(ctx, opts);
long mode = SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER;
#ifdef SSL_MODE_RELEASE_BUFFERS
mode |= SSL_MODE_RELEASE_BUFFERS;
#endif
SSL_CTX_set_mode(ctx, mode);
SSL_CTX_set_verify(ctx, SSL_VERIFY_NONE, nullptr);
SSL_CTX_set_session_cache_mode(ctx, SSL_SESS_CACHE_OFF);
SSL_CTX_set_info_callback(ctx, StaticSSLInfoCallback);
}
~Context()
{
SSL_CTX_free(ctx);
}
#ifndef INSPIRCD_OPENSSL_AUTO_DH
bool SetDH(DHParams& dh)
{
ERR_clear_error();
return (SSL_CTX_set_tmp_dh(ctx, dh.get()) >= 0);
}
#endif
#ifndef OPENSSL_NO_ECDH
void SetECDH(const std::string& curvename)
{
int nid = OBJ_sn2nid(curvename.c_str());
if (nid == NID_undef)
throw Exception("Unknown curve: " + curvename);
ERR_clear_error();
if (!SSL_CTX_set1_groups(ctx, &nid, 1))
throw Exception("Couldn't set ECDH curve");
}
#endif
bool SetCiphers(const std::string& ciphers)
{
// TLSv1 to TLSv1.2 ciphers.
ERR_clear_error();
return SSL_CTX_set_cipher_list(ctx, ciphers.c_str());
}
bool SetCiphersuites(const std::string& ciphers)
{
// TLSv1.3+ ciphers.
ERR_clear_error();
return SSL_CTX_set_ciphersuites(ctx, ciphers.c_str());
}
bool SetCerts(const std::string& filename)
{
ERR_clear_error();
return SSL_CTX_use_certificate_chain_file(ctx, filename.c_str());
}
bool SetPrivateKey(const std::string& filename)
{
ERR_clear_error();
return SSL_CTX_use_PrivateKey_file(ctx, filename.c_str(), SSL_FILETYPE_PEM);
}
bool SetCA(const std::string& filename)
{
ERR_clear_error();
return SSL_CTX_load_verify_locations(ctx, filename.c_str(), nullptr);
}
void SetCRL(const std::string& crlfile, const std::string& crlpath, const std::string& crlmode)
{
if (crlfile.empty() && crlpath.empty())
return;
/* Set CRL mode */
unsigned long crlflags = X509_V_FLAG_CRL_CHECK;
if (stdalgo::string::equalsci(crlmode, "chain"))
{
crlflags |= X509_V_FLAG_CRL_CHECK_ALL;
}
else if (!stdalgo::string::equalsci(crlmode, "leaf"))
{
throw ModuleException(thismod, "Unknown mode '" + crlmode + "'; expected either 'chain' (default) or 'leaf'");
}
/* Load CRL files */
X509_STORE* store = SSL_CTX_get_cert_store(ctx);
if (!store)
{
throw ModuleException(thismod, "Unable to get X509_STORE from TLS context; this should never happen");
}
ERR_clear_error();
if (!X509_STORE_load_locations(store,
crlfile.empty() ? nullptr : crlfile.c_str(),
crlpath.empty() ? nullptr : crlpath.c_str()))
{
unsigned long err = ERR_get_error();
throw ModuleException(thismod, "Unable to load CRL file '" + crlfile + "' or CRL path '" + crlpath + "': '" + (err ? ERR_error_string(err, nullptr) : "unknown") + "'");
}
/* Set CRL mode */
if (X509_STORE_set_flags(store, crlflags) != 1)
{
throw ModuleException(thismod, "Unable to set X509 CRL flags");
}
}
long GetDefaultContextOptions() const
{
return ctx_options;
}
long SetRawContextOptions(long setoptions, long clearoptions)
{
// Clear everything
SSL_CTX_clear_options(ctx, SSL_CTX_get_options(ctx));
// Set the default options and what is in the conf
SSL_CTX_set_options(ctx, ctx_options | setoptions);
return SSL_CTX_clear_options(ctx, clearoptions);
}
void SetVerifyCert()
{
SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
}
SSL* CreateServerSession()
{
SSL* sess = SSL_new(ctx);
SSL_set_accept_state(sess); // Act as server
return sess;
}
SSL* CreateClientSession()
{
SSL* sess = SSL_new(ctx);
SSL_set_connect_state(sess); // Act as client
return sess;
}
};
class Profile final
{
/** Name of this profile
*/
const std::string name;
#ifndef INSPIRCD_OPENSSL_AUTO_DH
/** DH parameters in use
*/
DHParams dh;
#endif
/** OpenSSL makes us have two contexts, one for servers and one for clients
*/
Context ctx;
Context clientctx;
/** Digest to use when generating fingerprints
*/
const EVP_MD* digest;
/** Last error, set by error_callback()
*/
std::string lasterr;
/** True if renegotiations are allowed, false if not
*/
const bool allowrenego;
/** Rough max size of records to send
*/
const unsigned int outrecsize;
static int error_callback(const char* str, size_t len, void* u)
{
Profile* profile = reinterpret_cast<Profile*>(u);
profile->lasterr = std::string(str, len - 1);
return 0;
}
/** Set raw OpenSSL context (SSL_CTX) options from a config tag
* @param ctxname Name of the context, client or server
* @param tag Config tag defining this profile
* @param context Context object to manipulate
*/
void SetContextOptions(const std::string& ctxname, const std::shared_ptr<ConfigTag>& tag, Context& context)
{
long setoptions = tag->getNum<long>(ctxname + "setoptions", 0);
long clearoptions = tag->getNum<long>(ctxname + "clearoptions", 0);
#ifdef SSL_OP_NO_COMPRESSION
// Disable compression by default
if (!tag->getBool("compression", false))
setoptions |= SSL_OP_NO_COMPRESSION;
#endif
#ifdef SSL_OP_NO_TLSv1_1
// Disable TLSv1.1 by default.
if (!tag->getBool("tlsv11", false))
setoptions |= SSL_OP_NO_TLSv1_1;
#endif
#ifdef SSL_OP_NO_TLSv1_2
// Enable TLSv1.2 by default.
if (!tag->getBool("tlsv12", true))
setoptions |= SSL_OP_NO_TLSv1_2;
#endif
#ifdef SSL_OP_NO_TLSv1_3
// Enable TLSv1.3 by default.
if (!tag->getBool("tlsv13", true))
setoptions |= SSL_OP_NO_TLSv1_3;
#endif
if (!setoptions && !clearoptions)
return; // Nothing to do
ServerInstance->Logs.Debug(MODNAME, "Setting {} {} context options, default: {} set: {} clear: {}", name, ctxname, ctx.GetDefaultContextOptions(), setoptions, clearoptions);
long final = context.SetRawContextOptions(setoptions, clearoptions);
ServerInstance->Logs.Normal(MODNAME, "{} {} context options: {}", name, ctxname, final);
}
public:
Profile(const std::string& profilename, const std::shared_ptr<ConfigTag>& tag)
: name(profilename)
#ifndef INSPIRCD_OPENSSL_AUTO_DH
, dh(ServerInstance->Config->Paths.PrependConfig(tag->getString("dhfile", "dhparams.pem", 1)))
#endif
, ctx(SSL_CTX_new(TLS_server_method()))
, clientctx(SSL_CTX_new(TLS_client_method()))
, allowrenego(tag->getBool("renegotiation")) // Disallow by default
, outrecsize(tag->getNum<unsigned int>("outrecsize", 2048, 512, 16384))
{
#ifndef INSPIRCD_OPENSSL_AUTO_DH
if ((!ctx.SetDH(dh)) || (!clientctx.SetDH(dh)))
throw Exception("Couldn't set DH parameters");
#endif
const std::string hash = tag->getString("hash", "sha256", 1);
digest = EVP_get_digestbyname(hash.c_str());
if (!digest)
throw Exception("Unknown hash type " + hash);
const std::string ciphers = tag->getString("ciphers");
if (!ciphers.empty())
{
if ((!ctx.SetCiphers(ciphers)) || (!clientctx.SetCiphers(ciphers)))
{
ERR_print_errors_cb(error_callback, this);
throw Exception("Can't set cipher list to \"" + ciphers + "\" " + lasterr);
}
}
const std::string ciphersuites = tag->getString("ciphersuites");
if (!ciphersuites.empty())
{
if ((!ctx.SetCiphersuites(ciphersuites)) || (!clientctx.SetCiphersuites(ciphersuites)))
{
ERR_print_errors_cb(error_callback, this);
throw Exception("Can't set ciphersuite list to \"" + ciphersuites + "\" " + lasterr);
}
}
#ifndef OPENSSL_NO_ECDH
const std::string curvename = tag->getString("ecdhcurve", "prime256v1");
if (!curvename.empty())
ctx.SetECDH(curvename);
#endif
SetContextOptions("server", tag, ctx);
SetContextOptions("client", tag, clientctx);
/* Load our keys and certificates
* NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
*/
std::string filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("certfile", "cert.pem", 1));
if ((!ctx.SetCerts(filename)) || (!clientctx.SetCerts(filename)))
{
ERR_print_errors_cb(error_callback, this);
throw Exception("Can't read certificate file: " + lasterr);
}
filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("keyfile", "key.pem", 1));
if ((!ctx.SetPrivateKey(filename)) || (!clientctx.SetPrivateKey(filename)))
{
ERR_print_errors_cb(error_callback, this);
throw Exception("Can't read key file: " + lasterr);
}
// Load the CAs we trust
filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("cafile", "ca.pem", 1));
if ((!ctx.SetCA(filename)) || (!clientctx.SetCA(filename)))
{
ERR_print_errors_cb(error_callback, this);
ServerInstance->Logs.Normal(MODNAME, "Can't read CA list from {}. This is only a problem if you want to verify client certificates, otherwise it's safe to ignore this message. Error: {}", filename, lasterr);
}
// Load the CRLs.
const std::string crlfile = tag->getString("crlfile");
const std::string crlpath = tag->getString("crlpath");
const std::string crlmode = tag->getString("crlmode", "chain", 1);
ctx.SetCRL(crlfile, crlpath, crlmode);
clientctx.SetVerifyCert();
if (tag->getBool("requestclientcert", true))
ctx.SetVerifyCert();
}
const std::string& GetName() const { return name; }
SSL* CreateServerSession() { return ctx.CreateServerSession(); }
SSL* CreateClientSession() { return clientctx.CreateClientSession(); }
const EVP_MD* GetDigest() { return digest; }
bool AllowRenegotiation() const { return allowrenego; }
unsigned int GetOutgoingRecordSize() const { return outrecsize; }
};
namespace BIOMethod
{
static int create(BIO* bio)
{
BIO_set_init(bio, 1);
return 1;
}
static int destroy(BIO* bio)
{
// XXX: Dummy function to avoid a memory leak in OpenSSL.
// The memory leak happens in BIO_free() (bio_lib.c) when the destroy func of the BIO is NULL.
// This is fixed in OpenSSL but some distros still ship the unpatched version hence we provide this workaround.
return 1;
}
static long ctrl(BIO* bio, int cmd, long num, void* ptr)
{
if (cmd == BIO_CTRL_FLUSH)
return 1;
return 0;
}
// These signatures are required by the BIO_meth_set_write|read interface
// even though they lead to shortening issues.
static int read(BIO* bio, char* buf, int len);
static int write(BIO* bio, const char* buf, int len);
static BIO_METHOD* alloc()
{
BIO_METHOD* meth = BIO_meth_new(100 | BIO_TYPE_SOURCE_SINK, "inspircd");
BIO_meth_set_write(meth, OpenSSL::BIOMethod::write);
BIO_meth_set_read(meth, OpenSSL::BIOMethod::read);
BIO_meth_set_ctrl(meth, OpenSSL::BIOMethod::ctrl);
BIO_meth_set_create(meth, OpenSSL::BIOMethod::create);
BIO_meth_set_destroy(meth, OpenSSL::BIOMethod::destroy);
return meth;
}
}
}
static BIO_METHOD* biomethods;
static int OnVerify(int preverify_ok, X509_STORE_CTX* ctx)
{
/* XXX: This will allow self signed certificates.
* In the future if we want an option to not allow this,
* we can just return preverify_ok here, and openssl
* will boot off self-signed and invalid peer certs.
*/
int ve = X509_STORE_CTX_get_error(ctx);
SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
return 1;
}
class OpenSSLIOHook final
: public SSLIOHook
{
private:
SSL* sess;
bool data_to_write = false;
// Returns 1 if handshake succeeded, 0 if it is still in progress, -1 if it failed
int Handshake(StreamSocket* user)
{
ERR_clear_error();
int ret = SSL_do_handshake(sess);
if (ret < 0)
{
int err = SSL_get_error(sess, ret);
if (err == SSL_ERROR_WANT_READ)
{
SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
this->status = STATUS_HANDSHAKING;
return 0;
}
else if (err == SSL_ERROR_WANT_WRITE)
{
SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
this->status = STATUS_HANDSHAKING;
return 0;
}
else
{
CloseSession();
return -1;
}
}
else if (ret > 0)
{
// Handshake complete.
VerifyCertificate();
status = STATUS_OPEN;
SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
return 1;
}
else if (ret == 0)
{
CloseSession();
}
return -1;
}
void CloseSession()
{
if (sess)
{
SSL_shutdown(sess);
SSL_free(sess);
}
sess = nullptr;
certificate = nullptr;
status = STATUS_NONE;
}
void VerifyCertificate()
{
X509* cert;
auto* certinfo = new ssl_cert();
this->certificate = certinfo;
unsigned int n;
unsigned char md[EVP_MAX_MD_SIZE];
cert = SSL_get_peer_certificate(sess);
if (!cert)
{
certinfo->error = "Could not get peer certificate: "+std::string(get_error());
return;
}
certinfo->invalid = (SSL_get_verify_result(sess) != X509_V_OK);
if (!SelfSigned)
{
certinfo->unknownsigner = false;
certinfo->trusted = true;
}
else
{
certinfo->unknownsigner = true;
certinfo->trusted = false;
}
GetDNString(X509_get_subject_name(cert), certinfo->dn);
GetDNString(X509_get_issuer_name(cert), certinfo->issuer);
if (!X509_digest(cert, GetProfile().GetDigest(), md, &n))
{
certinfo->error = "Out of memory generating fingerprint";
}
else
{
certinfo->fingerprint = Hex::Encode(md, n);
}
if ((ASN1_UTCTIME_cmp_time_t(X509_getm_notAfter(cert), ServerInstance->Time()) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_getm_notBefore(cert), ServerInstance->Time()) == 0))
{
certinfo->error = "Not activated, or expired certificate";
}
X509_free(cert);
}
static void GetDNString(X509_NAME* x509name, std::string& out)
{
char buf[512];
X509_NAME_oneline(x509name, buf, sizeof(buf));
out.assign(buf);
for (size_t pos = 0; ((pos = out.find_first_of("\r\n", pos)) != std::string::npos); )
out[pos] = ' ';
}
void SSLInfoCallback(int where, int rc)
{
if ((where & SSL_CB_HANDSHAKE_START) && (status == STATUS_OPEN))
{
if (GetProfile().AllowRenegotiation())
return;
// The other side is trying to renegotiate, kill the connection and change status
// to STATUS_NONE so CheckRenego() closes the session
status = STATUS_NONE;
BIO* bio = SSL_get_rbio(sess);
EventHandler* eh = static_cast<StreamSocket*>(BIO_get_data(bio));
SocketEngine::Shutdown(eh, 2);
}
}
bool CheckRenego(StreamSocket* sock)
{
if (status != STATUS_NONE)
return true;
ServerInstance->Logs.Debug(MODNAME, "Session {} killed, attempted to renegotiate", fmt::ptr(sess));
CloseSession();
sock->SetError("Renegotiation is not allowed");
return false;
}
// Returns 1 if application I/O should proceed, 0 if it must wait for the underlying protocol to progress, -1 on fatal error
int PrepareIO(StreamSocket* sock)
{
if (status == STATUS_OPEN)
return 1;
else if (status == STATUS_HANDSHAKING)
{
// The handshake isn't finished, try to finish it
return Handshake(sock);
}
CloseSession();
return -1;
}
// Calls our private SSLInfoCallback()
friend void StaticSSLInfoCallback(const SSL* ssl, int where, int rc);
public:
OpenSSLIOHook(const std::shared_ptr<IOHookProvider>& hookprov, StreamSocket* sock, SSL* session)
: SSLIOHook(hookprov)
, sess(session)
{
// Create BIO instance and store a pointer to the socket in it which will be used by the read and write functions
BIO* bio = BIO_new(biomethods);
BIO_set_data(bio, sock);
SSL_set_bio(sess, bio, bio);
SSL_set_ex_data(sess, exdataindex, this);
sock->AddIOHook(this);
Handshake(sock);
}
void OnStreamSocketClose(StreamSocket* user) override
{
CloseSession();
}
ssize_t OnStreamSocketRead(StreamSocket* user, std::string& recvq) override
{
// Finish handshake if needed
int prepret = PrepareIO(user);
if (prepret <= 0)
return prepret;
// If we resumed the handshake then this->status will be STATUS_OPEN
{
ERR_clear_error();
char* buffer = ServerInstance->GetReadBuffer();
int bufsiz = static_cast<int>(std::min<size_t>(ServerInstance->Config->NetBufferSize, INT_MAX));
int ret = SSL_read(sess, buffer, bufsiz);
if (!CheckRenego(user))
return -1;
if (ret > 0)
{
recvq.append(buffer, ret);
int mask = 0;
// Schedule a read if there is still data in the OpenSSL buffer
if (SSL_pending(sess) > 0)
mask |= FD_ADD_TRIAL_READ;
if (data_to_write)
mask |= FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE;
if (mask != 0)
SocketEngine::ChangeEventMask(user, mask);
return 1;
}
else if (ret == 0)
{
// Client closed connection.
CloseSession();
user->SetError("Connection closed");
return -1;
}
else // if (ret < 0)
{
int err = SSL_get_error(sess, ret);
if (err == SSL_ERROR_WANT_READ)
{
SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
return 0;
}
else if (err == SSL_ERROR_WANT_WRITE)
{
SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
return 0;
}
else
{
CloseSession();
return -1;
}
}
}
}
ssize_t OnStreamSocketWrite(StreamSocket* user, StreamSocket::SendQueue& sendq) override
{
// Finish handshake if needed
int prepret = PrepareIO(user);
if (prepret <= 0)
return prepret;
data_to_write = true;
// Session is ready for transferring application data
while (!sendq.empty())
{
ERR_clear_error();
FlattenSendQueue(sendq, GetProfile().GetOutgoingRecordSize());
const StreamSocket::SendQueue::Element& buffer = sendq.front();
int ret = SSL_write(sess, buffer.data(), static_cast<int>(buffer.size()));
if (!CheckRenego(user))
return -1;
if (ret == (int)buffer.length())
{
// Wrote entire record, continue sending
sendq.pop_front();
}
else if (ret > 0)
{
sendq.erase_front(ret);
SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
return 0;
}
else if (ret == 0)
{
CloseSession();
return -1;
}
else // if (ret < 0)
{
int err = SSL_get_error(sess, ret);
if (err == SSL_ERROR_WANT_WRITE)
{
SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
return 0;
}
else if (err == SSL_ERROR_WANT_READ)
{
SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
return 0;
}
else
{
CloseSession();
return -1;
}
}
}
data_to_write = false;
SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
return 1;
}
void GetCiphersuite(std::string& out) const override
{
if (!IsHookReady())
return;
out.append(SSL_get_version(sess)).push_back('-');
out.append(SSL_get_cipher(sess));
}
bool GetServerName(std::string& out) const override
{
const char* name = SSL_get_servername(sess, TLSEXT_NAMETYPE_host_name);
if (!name)
return false;
out.append(name);
return true;
}
OpenSSL::Profile& GetProfile();
};
static void StaticSSLInfoCallback(const SSL* ssl, int where, int rc)
{
OpenSSLIOHook* hook = static_cast<OpenSSLIOHook*>(SSL_get_ex_data(ssl, exdataindex));
hook->SSLInfoCallback(where, rc);
}
static int OpenSSL::BIOMethod::write(BIO* bio, const char* buffer, int size)
{
BIO_clear_retry_flags(bio);
StreamSocket* sock = static_cast<StreamSocket*>(BIO_get_data(bio));
if (sock->GetEventMask() & FD_WRITE_WILL_BLOCK)
{
// Writes blocked earlier, don't retry syscall
BIO_set_retry_write(bio);
return -1;
}
ssize_t ret = SocketEngine::Send(sock, buffer, size, 0);
if ((ret < size) && ((ret > 0) || (SocketEngine::IgnoreError())))
{
// Blocked, set retry flag for OpenSSL
SocketEngine::ChangeEventMask(sock, FD_WRITE_WILL_BLOCK);
BIO_set_retry_write(bio);
}
return static_cast<int>(ret);
}
static int OpenSSL::BIOMethod::read(BIO* bio, char* buffer, int size)
{
BIO_clear_retry_flags(bio);
StreamSocket* sock = static_cast<StreamSocket*>(BIO_get_data(bio));
if (sock->GetEventMask() & FD_READ_WILL_BLOCK)
{
// Reads blocked earlier, don't retry syscall
BIO_set_retry_read(bio);
return -1;
}
ssize_t ret = SocketEngine::Recv(sock, buffer, size, 0);
if ((ret < size) && ((ret > 0) || (SocketEngine::IgnoreError())))
{
// Blocked, set retry flag for OpenSSL
SocketEngine::ChangeEventMask(sock, FD_READ_WILL_BLOCK);
BIO_set_retry_read(bio);
}
return static_cast<int>(ret);
}
class OpenSSLIOHookProvider final
: public SSLIOHookProvider
{
OpenSSL::Profile profile;
public:
OpenSSLIOHookProvider(Module* mod, const std::string& profilename, const std::shared_ptr<ConfigTag>& tag)
: SSLIOHookProvider(mod, profilename)
, profile(profilename, tag)
{
ServerInstance->Modules.AddService(*this);
}
~OpenSSLIOHookProvider() override
{
ServerInstance->Modules.DelService(*this);
}
void OnAccept(StreamSocket* sock, const irc::sockets::sockaddrs& client, const irc::sockets::sockaddrs& server) override
{
new OpenSSLIOHook(shared_from_this(), sock, profile.CreateServerSession());
}
void OnConnect(StreamSocket* sock) override
{
new OpenSSLIOHook(shared_from_this(), sock, profile.CreateClientSession());
}
OpenSSL::Profile& GetProfile() { return profile; }
};
OpenSSL::Profile& OpenSSLIOHook::GetProfile()
{
return std::static_pointer_cast<OpenSSLIOHookProvider>(prov)->GetProfile();
}
class ModuleSSLOpenSSL final
: public Module
{
typedef std::vector<std::shared_ptr<OpenSSLIOHookProvider>> ProfileList;
ProfileList profiles;
void ReadProfiles()
{
ProfileList newprofiles;
auto tags = ServerInstance->Config->ConfTags("sslprofile");
if (tags.empty())
throw ModuleException(this, "You have not specified any <sslprofile> tags that are usable by this module!");
for (const auto& [_, tag] : tags)
{
if (!stdalgo::string::equalsci(tag->getString("provider"), "openssl"))
{
ServerInstance->Logs.Debug(MODNAME, "Ignoring non-OpenSSL <sslprofile> tag at " + tag->source.str());
continue;
}
std::string name = tag->getString("name");
if (name.empty())
{
ServerInstance->Logs.Warning(MODNAME, "Ignoring <sslprofile> tag without name at " + tag->source.str());
continue;
}
std::shared_ptr<OpenSSLIOHookProvider> prov;
try
{
prov = std::make_shared<OpenSSLIOHookProvider>(this, name, tag);
}
catch (const CoreException& ex)
{
throw ModuleException(this, "Error while initializing TLS profile \"" + name + "\" at " + tag->source.str() + " - " + ex.GetReason());
}
newprofiles.push_back(prov);
}
for (const auto& profile : profiles)
ServerInstance->Modules.DelService(*profile);
profiles.swap(newprofiles);
}
public:
ModuleSSLOpenSSL()
: Module(VF_VENDOR, "Allows TLS encrypted connections using the OpenSSL library.")
{
// Initialize OpenSSL
OPENSSL_init_ssl(0, nullptr);
biomethods = OpenSSL::BIOMethod::alloc();
thismod = this;
}
~ModuleSSLOpenSSL() override
{
BIO_meth_free(biomethods);
}
void init() override
{
ServerInstance->Logs.Normal(MODNAME, "Module was compiled against OpenSSL version {} and is running against version {}",
OPENSSL_VERSION_STR, OpenSSL_version(OPENSSL_VERSION_STRING));
// Register application specific data
char exdatastr[] = "inspircd";
exdataindex = SSL_get_ex_new_index(0, exdatastr, nullptr, nullptr, nullptr);
if (exdataindex < 0)
throw ModuleException(this, "Failed to register application specific data");
}
void ReadConfig(ConfigStatus& status) override
{
const auto& tag = ServerInstance->Config->ConfValue("openssl");
if (status.initial || tag->getBool("onrehash", true))
ReadProfiles();
}
void OnModuleRehash(User* user, const std::string& param) override
{
if (!irc::equals(param, "tls") && !irc::equals(param, "ssl"))
return;
try
{
ReadProfiles();
ServerInstance->SNO.WriteToSnoMask('r', "OpenSSL TLS profiles have been reloaded.");
}
catch (const ModuleException& ex)
{
ServerInstance->SNO.WriteToSnoMask('r', "Failed to reload the OpenSSL TLS profiles. " + ex.GetReason());
}
}
void OnCleanup(ExtensionType type, Extensible* item) override
{
if (type == ExtensionType::USER)
{
LocalUser* user = IS_LOCAL((User*)item);
if ((user) && (user->eh.GetModHook(this)))
{
// User is using TLS, they're a local user, and they're using one of *our* TLS ports.
// Potentially there could be multiple TLS modules loaded at once on different ports.
ServerInstance->Users.QuitUser(user, "OpenSSL module unloading");
}
}
}
ModResult OnCheckReady(LocalUser* user) override
{
const OpenSSLIOHook* const iohook = static_cast<OpenSSLIOHook*>(user->eh.GetModHook(this));
if ((iohook) && (!iohook->IsHookReady()))
return MOD_RES_DENY;
return MOD_RES_PASSTHRU;
}
};
MODULE_INIT(ModuleSSLOpenSSL)
