Wheee, two SSL modules :D And they work together ^^

git-svn-id: http://svn.inspircd.org/repository/trunk/inspircd@2961 e03df62e-2008-0410-955e-edbf42e46eb7

1 files changed, 653 insertions, 0 deletions

diff --git a/src/modules/extra/m_ssl_openssl.cpp b/src/modules/extra/m_ssl_openssl.cpp
new file mode 100644
index 000000000..2d970f05a
--- /dev/null
+++ b/src/modules/extra/m_ssl_openssl.cpp
@@ -0,0 +1,653 @@
+#include <string>
+#include <vector>
+
+#include <openssl/ssl.h>
+#include <openssl/err.h>
+
+#include "inspircd_config.h"
+#include "users.h"
+#include "channels.h"
+#include "modules.h"
+#include "helperfuncs.h"
+#include "socket.h"
+#include "hashcomp.h"
+
+/* $ModDesc: Provides SSL support for clients */
+/* $CompileFlags: -I/usr/include -I/usr/local/include */
+/* $LinkerFlags: -L/usr/local/lib -Wl,--rpath -Wl,/usr/local/lib -L/usr/lib -Wl,--rpath -Wl,/usr/lib -lssl -lcrypto */
+
+enum issl_status { ISSL_NONE, ISSL_HANDSHAKING, ISSL_OPEN };
+enum issl_io_status { ISSL_WRITE, ISSL_READ };
+
+bool isin(int port, std::vector<int> portlist)
+{
+	for(unsigned int i = 0; i < portlist.size(); i++)
+		if(portlist[i] == port)
+			return true;
+			
+	return false;
+}
+
+char* get_error()
+{
+	return ERR_error_string(ERR_get_error(), NULL);
+}
+
+class issl_session
+{
+public:
+	SSL* sess;
+	issl_status status;
+	issl_io_status rstat;
+	issl_io_status wstat;
+
+	unsigned int inbufoffset;
+	char* inbuf; 			// Buffer OpenSSL reads into.
+	std::string outbuf;	// Buffer for outgoing data that OpenSSL will not take.
+	int fd;
+	
+	issl_session()
+	{
+		rstat = ISSL_READ;
+		wstat = ISSL_WRITE;
+	}
+};
+
+class ModuleSSLOpenSSL : public Module
+{
+	Server* Srv;
+	ServerConfig* SrvConf;
+	ConfigReader* Conf;
+	
+	CullList culllist;
+	
+	std::vector<int> listenports;
+	
+	int inbufsize;
+	issl_session sessions[MAX_DESCRIPTORS];
+	
+	SSL_CTX* ctx;
+	
+	std::string keyfile;
+	std::string certfile;
+	std::string cafile;
+	// std::string crlfile;
+	std::string dhfile;
+	
+ public:
+	
+	ModuleSSLOpenSSL(Server* Me)
+		: Module::Module(Me)
+	{
+		Srv = Me;
+		SrvConf = Srv->GetConfig();
+		
+		// Not rehashable...because I cba to reduce all the sizes of existing buffers.
+		inbufsize = SrvConf->NetBufferSize;
+		
+		/* Global SSL library initialization*/
+      SSL_library_init();
+      SSL_load_error_strings();
+		
+		/* Build our SSL context*/
+		ctx = SSL_CTX_new( SSLv23_server_method() );
+
+		// Needs the flag as it ignores a plain /rehash
+		OnRehash("ssl");
+	}
+	
+	virtual void OnRehash(std::string param)
+	{
+		if(param != "ssl")
+			return;
+	
+		Conf = new ConfigReader;
+			
+		for(unsigned int i = 0; i < listenports.size(); i++)
+		{
+			SrvConf->DelIOHook(listenports[i]);
+		}
+		
+		listenports.clear();
+		
+		for(int i = 0; i < Conf->Enumerate("bind"); i++)
+		{
+			// For each <bind> tag
+			if(((Conf->ReadValue("bind", "type", i) == "") || (Conf->ReadValue("bind", "type", i) == "clients")) && (Conf->ReadValue("bind", "ssl", i) == "openssl"))
+			{
+				// Get the port we're meant to be listening on with SSL
+				unsigned int port = Conf->ReadInteger("bind", "port", i, true);
+				SrvConf->AddIOHook(port, this);
+				
+				// We keep a record of which ports we're listening on with SSL
+				listenports.push_back(port);
+				
+				log(DEFAULT, "m_ssl_openssl.so: Enabling SSL for port %d", port);
+			}
+		}
+		
+		std::string confdir(CONFIG_FILE);
+		// +1 so we the path ends with a /
+		confdir = confdir.substr(0, confdir.find_last_of('/') + 1);
+		
+		cafile	= Conf->ReadValue("openssl", "cafile", 0);
+		// crlfile	= Conf->ReadValue("openssl", "crlfile", 0);
+		certfile	= Conf->ReadValue("openssl", "certfile", 0);
+		keyfile	= Conf->ReadValue("openssl", "keyfile", 0);
+		dhfile	= Conf->ReadValue("openssl", "dhfile", 0);
+		
+		// Set all the default values needed.
+		if(cafile == "")
+			cafile = "ca.pem";
+			
+		//if(crlfile == "")
+		//	crlfile = "crl.pem";
+			
+		if(certfile == "")
+			certfile = "cert.pem";
+			
+		if(keyfile == "")
+			keyfile = "key.pem";
+			
+		if(dhfile == "")
+			dhfile = "dhparams.pem";
+			
+		// Prepend relative paths with the path to the config directory.	
+		if(cafile[0] != '/')
+			cafile = confdir + cafile;
+		
+		//if(crlfile[0] != '/')
+		//	crlfile = confdir + crlfile;
+			
+		if(certfile[0] != '/')
+			certfile = confdir + certfile;
+			
+		if(keyfile[0] != '/')
+			keyfile = confdir + keyfile;
+			
+		if(dhfile[0] != '/')
+			dhfile = confdir + dhfile;
+
+		/* Load our keys and certificates*/
+		if(!SSL_CTX_use_certificate_chain_file(ctx, certfile.c_str()))
+		{
+			log(DEFAULT, "m_ssl_openssl.so: Can't read certificate file %s", certfile.c_str());
+		}
+
+		if(!SSL_CTX_use_PrivateKey_file(ctx, keyfile.c_str(), SSL_FILETYPE_PEM))
+		{
+			log(DEFAULT, "m_ssl_openssl.so: Can't read key file %s", keyfile.c_str());
+		}
+
+		/* Load the CAs we trust*/
+		if(!SSL_CTX_load_verify_locations(ctx, cafile.c_str(), 0))
+		{
+			log(DEFAULT, "m_ssl_openssl.so: Can't read CA list from ", cafile.c_str());
+		}
+		        	
+		FILE* dhpfile = fopen(dhfile.c_str(), "r");
+		DH* ret;
+
+		if(dhpfile == NULL)
+		{
+			log(DEFAULT, "m_ssl_openssl.so Couldn't open DH file %s: %s", dhfile.c_str(), strerror(errno));
+		}
+		else
+		{
+			ret = PEM_read_DHparams(dhpfile, NULL, NULL, NULL);
+		}
+		
+		fclose(dhpfile);
+    
+		if(SSL_CTX_set_tmp_dh(ctx, ret) < 0)
+		{
+			log(DEFAULT, "m_ssl_openssl.so: Couldn't set DH parameters");
+		}
+
+		delete Conf;
+	}
+
+	virtual ~ModuleSSLOpenSSL()
+	{
+		SSL_CTX_free(ctx);
+	}
+	
+	virtual void OnCleanup(int target_type, void* item)
+	{
+		if(target_type == TYPE_USER)
+		{
+			userrec* user = (userrec*)item;
+			
+			if(user->GetExt("ssl") && IS_LOCAL(user) && isin(user->port, listenports))
+			{
+				// User is using SSL, they're a local user, and they're using one of *our* SSL ports.
+				// Potentially there could be multiple SSL modules loaded at once on different ports.
+				log(DEBUG, "m_ssl_openssl.so: Adding user %s to cull list", user->nick);
+				culllist.AddItem(user, "SSL module unloading");
+			}
+		}
+	}
+	
+	virtual void OnUnloadModule(Module* mod, std::string name)
+	{
+		if(mod == this)
+		{
+			// We're being unloaded, kill all the users added to the cull list in OnCleanup
+			int numusers = culllist.Apply();
+			log(DEBUG, "m_ssl_openssl.so: Killed %d users for unload of OpenSSL SSL module", numusers);
+			
+			for(unsigned int i = 0; i < listenports.size(); i++)
+				SrvConf->DelIOHook(listenports[i]);
+		}
+	}
+	
+	virtual Version GetVersion()
+	{
+		return Version(1, 0, 0, 0, VF_VENDOR);
+	}
+
+	void Implements(char* List)
+	{
+		List[I_OnRawSocketAccept] = List[I_OnRawSocketClose] = List[I_OnRawSocketRead] = List[I_OnRawSocketWrite] = List[I_OnCleanup] = 1;
+		List[I_OnSyncUserMetaData] = List[I_OnDecodeMetaData] = List[I_OnUnloadModule] = List[I_OnRehash] = List[I_OnWhois] = 1;
+	}
+
+	virtual void OnRawSocketAccept(int fd, std::string ip, int localport)
+	{
+		issl_session* session = &sessions[fd];
+	
+		session->fd = fd;
+		session->inbuf = new char[inbufsize];
+		session->inbufoffset = 0;		
+		session->sess = SSL_new(ctx);
+		session->status = ISSL_NONE;
+	
+		if(session->sess == NULL)
+		{
+			log(DEBUG, "m_ssl.so: Couldn't create SSL object: %s", get_error());
+			return;
+		}
+		
+		if(SSL_set_fd(session->sess, fd) == 0)
+		{
+			log(DEBUG, "m_ssl.so: Couldn't set fd for SSL object: %s", get_error());
+			return;
+		}
+
+ 		Handshake(session);
+	}
+
+	virtual void OnRawSocketClose(int fd)
+	{
+		log(DEBUG, "m_ssl_openssl.so: OnRawSocketClose: %d", fd);
+		CloseSession(&sessions[fd]);
+	}
+	
+	virtual int OnRawSocketRead(int fd, char* buffer, unsigned int count, int &readresult)
+	{
+		issl_session* session = &sessions[fd];
+		
+		if(!session->sess)
+		{
+			log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: No session to read from");
+			readresult = 0;
+			CloseSession(session);
+			return 1;
+		}
+		
+		log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead(%d, buffer, %u, %d)", fd, count, readresult);
+		
+		if(session->status == ISSL_HANDSHAKING)
+		{
+			if(session->rstat == ISSL_READ || session->wstat == ISSL_READ)
+			{
+				// The handshake isn't finished and it wants to read, try to finish it.
+				if(Handshake(session))
+				{
+					// Handshake successfully resumed.
+					log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: successfully resumed handshake");
+				}
+				else
+				{
+					// Couldn't resume handshake.	
+					log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: failed to resume handshake");
+					return -1;
+				}
+			}
+			else
+			{
+				log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: handshake wants to write data but we are currently reading");
+				return -1;			
+			}
+		}
+		
+		// If we resumed the handshake then session->status will be ISSL_OPEN
+				
+		if(session->status == ISSL_OPEN)
+		{
+			if(session->wstat == ISSL_READ)
+			{
+				if(DoWrite(session) == 0)
+					return 0;
+			}
+			
+			if(session->rstat == ISSL_READ)
+			{
+				int ret = DoRead(session);
+			
+				if(ret > 0)
+				{
+					if(count <= session->inbufoffset)
+					{
+						memcpy(buffer, session->inbuf, count);
+						// Move the stuff left in inbuf to the beginning of it
+						memcpy(session->inbuf, session->inbuf + count, (session->inbufoffset - count));
+						// Now we need to set session->inbufoffset to the amount of data still waiting to be handed to insp.
+						session->inbufoffset -= count;
+						// Insp uses readresult as the count of how much data there is in buffer, so:
+						readresult = count;
+					}
+					else
+					{
+						// There's not as much in the inbuf as there is space in the buffer, so just copy the whole thing.
+						memcpy(buffer, session->inbuf, session->inbufoffset);
+						
+						readresult = session->inbufoffset;
+						// Zero the offset, as there's nothing there..
+						session->inbufoffset = 0;
+					}
+				
+					log(DEBUG, "m_ssl_openssl.so: OnRawSocketRead: Passing %d bytes up to insp:");
+					Srv->Log(DEBUG, std::string(buffer, readresult));
+				
+					return 1;
+				}
+				else
+				{
+					return ret;
+				}
+			}
+		}
+		
+		return -1;
+	}
+	
+	virtual int OnRawSocketWrite(int fd, char* buffer, int count)
+	{		
+		issl_session* session = &sessions[fd];
+
+		if(!session->sess)
+		{
+			log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: No session to write to");
+			CloseSession(session);
+			return 1;
+		}
+		
+		log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: Adding %d bytes to the outgoing buffer", count);		
+		session->outbuf.append(buffer, count);
+		
+		if(session->status == ISSL_HANDSHAKING)
+		{
+			// The handshake isn't finished, try to finish it.
+			if(session->rstat == ISSL_WRITE || session->wstat == ISSL_WRITE)
+			{
+				if(Handshake(session))
+				{
+					// Handshake successfully resumed.
+					log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: successfully resumed handshake");
+				}
+				else
+				{
+					// Couldn't resume handshake.	
+					log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: failed to resume handshake"); 
+				}
+			}
+			else
+			{
+				log(DEBUG, "m_ssl_openssl.so: OnRawSocketWrite: handshake wants to read data but we are currently writing");			
+			}
+		}
+		
+		if(session->status == ISSL_OPEN)
+		{
+			if(session->rstat == ISSL_WRITE)
+			{
+				DoRead(session);
+			}
+			
+			if(session->wstat == ISSL_WRITE)
+			{
+				return DoWrite(session);
+			}
+		}
+		
+		return 1;
+	}
+	
+	int DoWrite(issl_session* session)
+	{
+		log(DEBUG, "m_ssl_openssl.so: DoWrite: Trying to write %d bytes:", session->outbuf.size());
+		Srv->Log(DEBUG, session->outbuf);
+			
+		int ret = SSL_write(session->sess, session->outbuf.data(), session->outbuf.size());
+		
+		if(ret == 0)
+		{
+			log(DEBUG, "m_ssl_openssl.so: DoWrite: Client closed the connection");
+			CloseSession(session);
+			return 0;
+		}
+		else if(ret < 0)
+		{
+			int err = SSL_get_error(session->sess, ret);
+			
+			if(err == SSL_ERROR_WANT_WRITE)
+			{
+				log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written, need to retry: %s", get_error());
+				session->wstat = ISSL_WRITE;
+				return -1;
+			}
+			else if(err == SSL_ERROR_WANT_READ)
+			{
+				log(DEBUG, "m_ssl_openssl.so: DoWrite: Not all SSL data written but the damn thing wants to read instead: %s", get_error());
+				session->wstat = ISSL_READ;
+				return -1;
+			}
+			else
+			{
+				log(DEBUG, "m_ssl_openssl.so: DoWrite: Error writing SSL data: %s", get_error());
+				CloseSession(session);
+				return 0;
+			}
+		}
+		else
+		{
+			log(DEBUG, "m_ssl_openssl.so: DoWrite: Successfully wrote %d bytes", ret);
+			session->outbuf = session->outbuf.substr(ret);
+			return ret;
+		}
+	}
+	
+	int DoRead(issl_session* session)
+	{
+		// Is this right? Not sure if the unencrypted data is garaunteed to be the same length.
+		// Read into the inbuffer, offset from the beginning by the amount of data we have that insp hasn't taken yet.
+		log(DEBUG, "m_ssl_openssl.so: DoRead: SSL_read(sess, inbuf+%d, %d-%d)", session->inbufoffset, inbufsize, session->inbufoffset);
+			
+		int ret = SSL_read(session->sess, session->inbuf + session->inbufoffset, inbufsize - session->inbufoffset);
+
+		if(ret == 0)
+		{
+			// Client closed connection.
+			log(DEBUG, "m_ssl_openssl.so: DoRead: Client closed the connection");
+			CloseSession(session);
+			return 0;
+		}
+		else if(ret < 0)
+		{
+			int err = SSL_get_error(session->sess, ret);
+				
+			if(err == SSL_ERROR_WANT_READ)
+			{
+				log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read, need to retry: %s", get_error());
+				session->rstat = ISSL_READ;
+				return -1;
+			}
+			else if(err == SSL_ERROR_WANT_WRITE)
+			{
+				log(DEBUG, "m_ssl_openssl.so: DoRead: Not all SSL data read but the damn thing wants to write instead: %s", get_error());
+				session->rstat = ISSL_WRITE;
+				return -1;
+			}
+			else
+			{
+				log(DEBUG, "m_ssl_openssl.so: DoRead: Error reading SSL data: %s", get_error());
+				CloseSession(session);
+				return 0;
+			}
+		}
+		else
+		{
+			// Read successfully 'ret' bytes into inbuf + inbufoffset
+			// There are 'ret' + 'inbufoffset' bytes of data in 'inbuf'
+			// 'buffer' is 'count' long
+			
+			log(DEBUG, "m_ssl_openssl.so: DoRead: Read %d bytes, now have %d waiting to be passed up", ret, ret + session->inbufoffset);
+
+			session->inbufoffset += ret;
+
+			return ret;
+		}
+	}
+	
+	// :kenny.chatspike.net 320 Om Epy|AFK :is a Secure Connection
+	virtual void OnWhois(userrec* source, userrec* dest)
+	{
+		if(dest->GetExt("ssl"))
+		{
+			WriteServ(source->fd, "320 %s %s :is a Secure Connection", source->nick, dest->nick);
+		}
+	}
+	
+	virtual void OnSyncUserMetaData(userrec* user, Module* proto, void* opaque, std::string extname)
+	{
+		// check if the linking module wants to know about OUR metadata
+		if(extname == "ssl")
+		{
+			// check if this user has an swhois field to send
+			if(user->GetExt(extname))
+			{
+				// call this function in the linking module, let it format the data how it
+				// sees fit, and send it on its way. We dont need or want to know how.
+				proto->ProtoSendMetaData(opaque, TYPE_USER, user, extname, "ON");
+			}
+		}
+	}
+	
+	virtual void OnDecodeMetaData(int target_type, void* target, std::string extname, std::string extdata)
+	{
+		// check if its our metadata key, and its associated with a user
+		if ((target_type == TYPE_USER) && (extname == "ssl"))
+		{
+			userrec* dest = (userrec*)target;
+			// if they dont already have an ssl flag, accept the remote server's
+			if (!dest->GetExt(extname))
+			{
+				dest->Extend(extname, "ON");
+			}
+		}
+	}
+	
+	bool Handshake(issl_session* session)
+	{		
+		int ret = SSL_accept(session->sess);
+      
+      if(ret < 0)
+		{
+			int err = SSL_get_error(session->sess, ret);
+				
+			if(err == SSL_ERROR_WANT_READ)
+			{
+				log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to read again: %s", get_error());
+				session->rstat = ISSL_READ;
+				session->status = ISSL_HANDSHAKING;
+			}
+			else if(err == SSL_ERROR_WANT_WRITE)
+			{
+				log(DEBUG, "m_ssl_openssl.so: Handshake: Not completed, need to write more data: %s", get_error());
+				session->wstat = ISSL_WRITE;
+				session->status = ISSL_HANDSHAKING;
+				MakePollWrite(session);
+			}
+			else
+			{
+				log(DEBUG, "m_ssl_openssl.so: Handshake: Failed, bailing: %s", get_error());
+				CloseSession(session);
+			}
+
+			return false;
+		}
+		else
+		{
+			// Handshake complete.
+			log(DEBUG, "m_ssl_openssl.so: Handshake completed");
+			
+			// This will do for setting the ssl flag...it could be done earlier if it's needed. But this seems neater.
+			Srv->FindDescriptor(session->fd)->Extend("ssl", "ON");
+			
+			session->status = ISSL_OPEN;
+			
+			MakePollWrite(session);
+			
+			return true;
+		}
+	}
+	
+	void MakePollWrite(issl_session* session)
+	{
+		OnRawSocketWrite(session->fd, NULL, 0);
+	}
+	
+	void CloseSession(issl_session* session)
+	{
+		if(session->sess)
+		{
+			SSL_shutdown(session->sess);
+			SSL_free(session->sess);
+		}
+		
+		if(session->inbuf)
+		{
+			delete[] session->inbuf;
+		}
+		
+		session->outbuf.clear();
+		session->inbuf = NULL;
+		session->sess = NULL;
+		session->status = ISSL_NONE;
+	}
+};
+
+class ModuleSSLOpenSSLFactory : public ModuleFactory
+{
+ public:
+	ModuleSSLOpenSSLFactory()
+	{
+	}
+	
+	~ModuleSSLOpenSSLFactory()
+	{
+	}
+	
+	virtual Module * CreateModule(Server* Me)
+	{
+		return new ModuleSSLOpenSSL(Me);
+	}
+};
+
+
+extern "C" void * init_module( void )
+{
+	return new ModuleSSLOpenSSLFactory;
+}
+