2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
6 * Copyright (C) 2006-2008 Craig Edwards <craigedwards@brainbox.cc>
7 * Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
8 * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
9 * Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
11 * This file is part of InspIRCd. InspIRCd is free software: you can
12 * redistribute it and/or modify it under the terms of the GNU General Public
13 * License as published by the Free Software Foundation, version 2.
15 * This program is distributed in the hope that it will be useful, but WITHOUT
16 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
17 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
20 * You should have received a copy of the GNU General Public License
21 * along with this program. If not, see <http://www.gnu.org/licenses/>.
24 /* HACK: This prevents OpenSSL on OS X 10.7 and later from spewing deprecation
25 * warnings for every single function call. As far as I (SaberUK) know, Apple
26 * have no plans to remove OpenSSL so this warning just causes needless spam.
29 # define __AVAILABILITYMACROS__
30 # define DEPRECATED_IN_MAC_OS_X_VERSION_10_7_AND_LATER
35 #include <openssl/ssl.h>
36 #include <openssl/err.h>
37 #include "modules/ssl.h"
40 # pragma comment(lib, "libcrypto.lib")
41 # pragma comment(lib, "libssl.lib")
42 # pragma comment(lib, "user32.lib")
43 # pragma comment(lib, "advapi32.lib")
44 # pragma comment(lib, "libgcc.lib")
45 # pragma comment(lib, "libmingwex.lib")
46 # pragma comment(lib, "gdi32.lib")
47 # undef MAX_DESCRIPTORS
48 # define MAX_DESCRIPTORS 10000
51 /* $CompileFlags: pkgconfversion("openssl","0.9.7") pkgconfincludes("openssl","/openssl/ssl.h","") -Wno-pedantic */
52 /* $LinkerFlags: rpath("pkg-config --libs openssl") pkgconflibs("openssl","/libssl.so","-lssl -lcrypto") */
54 enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
56 static bool SelfSigned = false;
60 return ERR_error_string(ERR_get_error(), NULL);
63 static int OnVerify(int preverify_ok, X509_STORE_CTX* ctx);
67 class Exception : public ModuleException
70 Exception(const std::string& reason)
71 : ModuleException(reason) { }
79 DHParams(const std::string& filename)
81 FILE* dhpfile = fopen(filename.c_str(), "r");
83 throw Exception("Couldn't open DH file " + filename + ": " + strerror(errno));
85 dh = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
88 throw Exception("Couldn't read DH params from file " + filename);
107 Context(SSL_CTX* context)
110 SSL_CTX_set_mode(ctx, SSL_MODE_ENABLE_PARTIAL_WRITE | SSL_MODE_ACCEPT_MOVING_WRITE_BUFFER);
111 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER | SSL_VERIFY_CLIENT_ONCE, OnVerify);
119 bool SetDH(DHParams& dh)
121 return (SSL_CTX_set_tmp_dh(ctx, dh.get()) >= 0);
124 bool SetCiphers(const std::string& ciphers)
126 return SSL_CTX_set_cipher_list(ctx, ciphers.c_str());
129 bool SetCerts(const std::string& filename)
131 return SSL_CTX_use_certificate_chain_file(ctx, filename.c_str());
134 bool SetPrivateKey(const std::string& filename)
136 return SSL_CTX_use_PrivateKey_file(ctx, filename.c_str(), SSL_FILETYPE_PEM);
139 bool SetCA(const std::string& filename)
141 return SSL_CTX_load_verify_locations(ctx, filename.c_str(), 0);
150 class Profile : public refcountbase
152 /** Name of this profile
154 const std::string name;
156 /** DH parameters in use
160 /** OpenSSL makes us have two contexts, one for servers and one for clients
165 /** Digest to use when generating fingerprints
167 const EVP_MD* digest;
169 /** Last error, set by error_callback()
173 static int error_callback(const char* str, size_t len, void* u)
175 Profile* profile = reinterpret_cast<Profile*>(u);
176 profile->lasterr = std::string(str, len - 1);
181 Profile(const std::string& profilename, ConfigTag* tag)
183 , dh(ServerInstance->Config->Paths.PrependConfig(tag->getString("dhfile", "dh.pem")))
184 , ctx(SSL_CTX_new(SSLv23_server_method()))
185 , clictx(SSL_CTX_new(SSLv23_client_method()))
187 if ((!ctx.SetDH(dh)) || (!clictx.SetDH(dh)))
188 throw Exception("Couldn't set DH parameters");
190 std::string hash = tag->getString("hash", "md5");
191 digest = EVP_get_digestbyname(hash.c_str());
193 throw Exception("Unknown hash type " + hash);
195 std::string ciphers = tag->getString("ciphers");
196 if (!ciphers.empty())
198 if ((!ctx.SetCiphers(ciphers)) || (!clictx.SetCiphers(ciphers)))
200 ERR_print_errors_cb(error_callback, this);
201 throw Exception("Can't set cipher list to \"" + ciphers + "\" " + lasterr);
205 /* Load our keys and certificates
206 * NOTE: OpenSSL's error logging API sucks, don't blame us for this clusterfuck.
208 std::string filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("certfile", "cert.pem"));
209 if ((!ctx.SetCerts(filename)) || (!clictx.SetCerts(filename)))
211 ERR_print_errors_cb(error_callback, this);
212 throw Exception("Can't read certificate file: " + lasterr);
215 filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("keyfile", "key.pem"));
216 if ((!ctx.SetPrivateKey(filename)) || (!clictx.SetPrivateKey(filename)))
218 ERR_print_errors_cb(error_callback, this);
219 throw Exception("Can't read key file: " + lasterr);
222 // Load the CAs we trust
223 filename = ServerInstance->Config->Paths.PrependConfig(tag->getString("cafile", "ca.pem"));
224 if ((!ctx.SetCA(filename)) || (!clictx.SetCA(filename)))
226 ERR_print_errors_cb(error_callback, this);
227 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Can't read CA list from %s. This is only a problem if you want to verify client certificates, otherwise it's safe to ignore this message. Error: %s", filename.c_str(), lasterr.c_str());
231 const std::string& GetName() const { return name; }
232 SSL* CreateServerSession() { return ctx.CreateSession(); }
233 SSL* CreateClientSession() { return clictx.CreateSession(); }
234 const EVP_MD* GetDigest() { return digest; }
238 static int OnVerify(int preverify_ok, X509_STORE_CTX *ctx)
240 /* XXX: This will allow self signed certificates.
241 * In the future if we want an option to not allow this,
242 * we can just return preverify_ok here, and openssl
243 * will boot off self-signed and invalid peer certs.
245 int ve = X509_STORE_CTX_get_error(ctx);
247 SelfSigned = (ve == X509_V_ERR_DEPTH_ZERO_SELF_SIGNED_CERT);
252 class OpenSSLIOHook : public SSLIOHook
259 reference<OpenSSL::Profile> profile;
261 bool Handshake(StreamSocket* user)
266 ret = SSL_connect(sess);
268 ret = SSL_accept(sess);
272 int err = SSL_get_error(sess, ret);
274 if (err == SSL_ERROR_WANT_READ)
276 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
277 this->status = ISSL_HANDSHAKING;
280 else if (err == SSL_ERROR_WANT_WRITE)
282 SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
283 this->status = ISSL_HANDSHAKING;
295 // Handshake complete.
300 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE | FD_ADD_TRIAL_WRITE);
326 void VerifyCertificate()
329 ssl_cert* certinfo = new ssl_cert;
330 this->certificate = certinfo;
332 unsigned char md[EVP_MAX_MD_SIZE];
334 cert = SSL_get_peer_certificate(sess);
338 certinfo->error = "Could not get peer certificate: "+std::string(get_error());
342 certinfo->invalid = (SSL_get_verify_result(sess) != X509_V_OK);
346 certinfo->unknownsigner = false;
347 certinfo->trusted = true;
351 certinfo->unknownsigner = true;
352 certinfo->trusted = false;
355 certinfo->dn = X509_NAME_oneline(X509_get_subject_name(cert),0,0);
356 certinfo->issuer = X509_NAME_oneline(X509_get_issuer_name(cert),0,0);
358 if (!X509_digest(cert, profile->GetDigest(), md, &n))
360 certinfo->error = "Out of memory generating fingerprint";
364 certinfo->fingerprint = BinToHex(md, n);
367 if ((ASN1_UTCTIME_cmp_time_t(X509_get_notAfter(cert), ServerInstance->Time()) == -1) || (ASN1_UTCTIME_cmp_time_t(X509_get_notBefore(cert), ServerInstance->Time()) == 0))
369 certinfo->error = "Not activated, or expired certificate";
376 OpenSSLIOHook(IOHookProvider* hookprov, StreamSocket* sock, bool is_outbound, SSL* session, const reference<OpenSSL::Profile>& sslprofile)
377 : SSLIOHook(hookprov)
380 , outbound(is_outbound)
381 , data_to_write(false)
382 , profile(sslprofile)
386 if (SSL_set_fd(sess, sock->GetFd()) == 0)
387 throw ModuleException("Can't set fd with SSL_set_fd: " + ConvToStr(sock->GetFd()));
389 sock->AddIOHook(this);
393 void OnStreamSocketClose(StreamSocket* user) CXX11_OVERRIDE
398 int OnStreamSocketRead(StreamSocket* user, std::string& recvq) CXX11_OVERRIDE
406 if (status == ISSL_HANDSHAKING)
408 // The handshake isn't finished and it wants to read, try to finish it.
409 if (!Handshake(user))
411 // Couldn't resume handshake.
412 if (status == ISSL_NONE)
418 // If we resumed the handshake then this->status will be ISSL_OPEN
420 if (status == ISSL_OPEN)
422 char* buffer = ServerInstance->GetReadBuffer();
423 size_t bufsiz = ServerInstance->Config->NetBufferSize;
424 int ret = SSL_read(sess, buffer, bufsiz);
428 recvq.append(buffer, ret);
430 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_SINGLE_WRITE);
435 // Client closed connection.
437 user->SetError("Connection closed");
442 int err = SSL_get_error(sess, ret);
444 if (err == SSL_ERROR_WANT_READ)
446 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
449 else if (err == SSL_ERROR_WANT_WRITE)
451 SocketEngine::ChangeEventMask(user, FD_WANT_NO_READ | FD_WANT_SINGLE_WRITE);
465 int OnStreamSocketWrite(StreamSocket* user, std::string& buffer) CXX11_OVERRIDE
473 data_to_write = true;
475 if (status == ISSL_HANDSHAKING)
477 if (!Handshake(user))
479 // Couldn't resume handshake.
480 if (status == ISSL_NONE)
486 if (status == ISSL_OPEN)
488 int ret = SSL_write(sess, buffer.data(), buffer.size());
489 if (ret == (int)buffer.length())
491 data_to_write = false;
492 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ | FD_WANT_NO_WRITE);
497 buffer = buffer.substr(ret);
498 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
508 int err = SSL_get_error(sess, ret);
510 if (err == SSL_ERROR_WANT_WRITE)
512 SocketEngine::ChangeEventMask(user, FD_WANT_SINGLE_WRITE);
515 else if (err == SSL_ERROR_WANT_READ)
517 SocketEngine::ChangeEventMask(user, FD_WANT_POLL_READ);
530 void TellCiphersAndFingerprint(LocalUser* user)
534 std::string text = "*** You are connected using SSL cipher '" + std::string(SSL_get_cipher(sess)) + "'";
535 const std::string& fingerprint = certificate->fingerprint;
536 if (!fingerprint.empty())
537 text += " and your SSL fingerprint is " + fingerprint;
539 user->WriteNotice(text);
544 class OpenSSLIOHookProvider : public refcountbase, public IOHookProvider
546 reference<OpenSSL::Profile> profile;
549 OpenSSLIOHookProvider(Module* mod, reference<OpenSSL::Profile>& prof)
550 : IOHookProvider(mod, "ssl/" + prof->GetName(), IOHookProvider::IOH_SSL)
553 ServerInstance->Modules->AddService(*this);
556 ~OpenSSLIOHookProvider()
558 ServerInstance->Modules->DelService(*this);
561 void OnAccept(StreamSocket* sock, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server) CXX11_OVERRIDE
563 new OpenSSLIOHook(this, sock, false, profile->CreateServerSession(), profile);
566 void OnConnect(StreamSocket* sock) CXX11_OVERRIDE
568 new OpenSSLIOHook(this, sock, true, profile->CreateClientSession(), profile);
572 class ModuleSSLOpenSSL : public Module
574 typedef std::vector<reference<OpenSSLIOHookProvider> > ProfileList;
576 ProfileList profiles;
580 ProfileList newprofiles;
581 ConfigTagList tags = ServerInstance->Config->ConfTags("sslprofile");
582 if (tags.first == tags.second)
584 // Create a default profile named "openssl"
585 const std::string defname = "openssl";
586 ConfigTag* tag = ServerInstance->Config->ConfValue(defname);
587 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "No <sslprofile> tags found, using settings from the <openssl> tag");
591 reference<OpenSSL::Profile> profile(new OpenSSL::Profile(defname, tag));
592 newprofiles.push_back(new OpenSSLIOHookProvider(this, profile));
594 catch (OpenSSL::Exception& ex)
596 throw ModuleException("Error while initializing the default SSL profile - " + ex.GetReason());
600 for (ConfigIter i = tags.first; i != tags.second; ++i)
602 ConfigTag* tag = i->second;
603 if (tag->getString("provider") != "openssl")
606 std::string name = tag->getString("name");
609 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Ignoring <sslprofile> tag without name at " + tag->getTagLocation());
613 reference<OpenSSL::Profile> profile;
616 profile = new OpenSSL::Profile(name, tag);
618 catch (CoreException& ex)
620 throw ModuleException("Error while initializing SSL profile \"" + name + "\" at " + tag->getTagLocation() + " - " + ex.GetReason());
623 newprofiles.push_back(new OpenSSLIOHookProvider(this, profile));
626 profiles.swap(newprofiles);
632 // Initialize OpenSSL
634 SSL_load_error_strings();
637 void init() CXX11_OVERRIDE
642 void OnModuleRehash(User* user, const std::string ¶m) CXX11_OVERRIDE
651 catch (ModuleException& ex)
653 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, ex.GetReason() + " Not applying settings.");
657 void OnUserConnect(LocalUser* user) CXX11_OVERRIDE
659 IOHook* hook = user->eh.GetIOHook();
660 if (hook && hook->prov->creator == this)
661 static_cast<OpenSSLIOHook*>(hook)->TellCiphersAndFingerprint(user);
664 void OnCleanup(int target_type, void* item) CXX11_OVERRIDE
666 if (target_type == TYPE_USER)
668 LocalUser* user = IS_LOCAL((User*)item);
670 if (user && user->eh.GetIOHook() && user->eh.GetIOHook()->prov->creator == this)
672 // User is using SSL, they're a local user, and they're using one of *our* SSL ports.
673 // Potentially there could be multiple SSL modules loaded at once on different ports.
674 ServerInstance->Users->QuitUser(user, "SSL module unloading");
679 Version GetVersion() CXX11_OVERRIDE
681 return Version("Provides SSL support for clients", VF_VENDOR);
685 MODULE_INIT(ModuleSSLOpenSSL)