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/********************************************************************\ * BitlBee -- An IRC to other IM-networks gateway * * * * Copyright 2002-2012 Wilmer van der Gaast and others * \********************************************************************/ /* SSL module - OpenSSL version */ /* This program 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; either version 2 of the License, or (at your option) any later version. 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 with the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include <openssl/crypto.h> #include <openssl/rand.h> #include <openssl/x509.h> #include <openssl/pem.h> #include <openssl/ssl.h> #include <openssl/err.h> #include "bitlbee.h" #include "proxy.h" #include "ssl_client.h" #include "sock.h" int ssl_errno = 0; static gboolean initialized = FALSE; struct scd { ssl_input_function func; gpointer data; int fd; gboolean established; gboolean verify; char *hostname; int inpa; int lasterr; /* Necessary for SSL_get_error */ SSL *ssl; }; static SSL_CTX *ssl_ctx; static void ssl_conn_free( struct scd *conn ); static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond ); static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond ); static gboolean ssl_handshake( gpointer data, gint source, b_input_condition cond ); void ssl_init( void ) { const SSL_METHOD *meth; SSL_library_init(); meth = TLSv1_client_method(); ssl_ctx = SSL_CTX_new( meth ); initialized = TRUE; } void *ssl_connect( char *host, int port, gboolean verify, ssl_input_function func, gpointer data ) { struct scd *conn = g_new0( struct scd, 1 ); conn->fd = proxy_connect( host, port, ssl_connected, conn ); if( conn->fd < 0 ) { ssl_conn_free( conn ); return NULL; } conn->func = func; conn->data = data; conn->inpa = -1; conn->hostname = g_strdup( host ); return conn; } void *ssl_starttls( int fd, char *hostname, gboolean verify, ssl_input_function func, gpointer data ) { struct scd *conn = g_new0( struct scd, 1 ); conn->fd = fd; conn->func = func; conn->data = data; conn->inpa = -1; conn->verify = verify && global.conf->cafile; conn->hostname = g_strdup( hostname ); /* This function should be called via a (short) timeout instead of directly from here, because these SSL calls are *supposed* to be *completely* asynchronous and not ready yet when this function (or *_connect, for examle) returns. Also, errors are reported via the callback function, not via this function's return value. In short, doing things like this makes the rest of the code a lot simpler. */ b_timeout_add( 1, ssl_starttls_real, conn ); return conn; } static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond ) { struct scd *conn = data; return ssl_connected( conn, conn->fd, B_EV_IO_WRITE ); } static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond ) { struct scd *conn = data; if( conn->verify ) { /* Right now we don't have any verification functionality for OpenSSL. */ conn->func( conn->data, 1, NULL, cond ); if( source >= 0 ) closesocket( source ); ssl_conn_free( conn ); return FALSE; } if( source == -1 ) goto ssl_connected_failure; if( !initialized ) { ssl_init(); } if( ssl_ctx == NULL ) goto ssl_connected_failure; conn->ssl = SSL_new( ssl_ctx ); if( conn->ssl == NULL ) goto ssl_connected_failure; /* We can do at least the handshake with non-blocking I/O */ sock_make_nonblocking( conn->fd ); SSL_set_fd( conn->ssl, conn->fd ); if( conn->hostname && !isdigit( conn->hostname[0] ) ) SSL_set_tlsext_host_name( conn->ssl, conn->hostname ); return ssl_handshake( data, source, cond ); ssl_connected_failure: conn->func( conn->data, 0, NULL, cond ); ssl_disconnect( conn ); return FALSE; } static gboolean ssl_handshake( gpointer data, gint source, b_input_condition cond ) { struct scd *conn = data; int st; if( ( st = SSL_connect( conn->ssl ) ) < 0 ) { conn->lasterr = SSL_get_error( conn->ssl, st ); if( conn->lasterr != SSL_ERROR_WANT_READ && conn->lasterr != SSL_ERROR_WANT_WRITE ) { conn->func( conn->data, 0, NULL, cond ); ssl_disconnect( conn ); return FALSE; } conn->inpa = b_input_add( conn->fd, ssl_getdirection( conn ), ssl_handshake, data ); return FALSE; } conn->established = TRUE; sock_make_blocking( conn->fd ); /* For now... */ conn->func( conn->data, 0, conn, cond ); return FALSE; } int ssl_read( void *conn, char *buf, int len ) { int st; if( !((struct scd*)conn)->established ) { ssl_errno = SSL_NOHANDSHAKE; return -1; } st = SSL_read( ((struct scd*)conn)->ssl, buf, len ); ssl_errno = SSL_OK; if( st <= 0 ) { ((struct scd*)conn)->lasterr = SSL_get_error( ((struct scd*)conn)->ssl, st ); if( ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_READ || ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_WRITE ) ssl_errno = SSL_AGAIN; } if( 0 && getenv( "BITLBEE_DEBUG" ) && st > 0 ) write( 1, buf, st ); return st; } int ssl_write( void *conn, const char *buf, int len ) { int st; if( !((struct scd*)conn)->established ) { ssl_errno = SSL_NOHANDSHAKE; return -1; } st = SSL_write( ((struct scd*)conn)->ssl, buf, len ); if( 0 && getenv( "BITLBEE_DEBUG" ) && st > 0 ) write( 1, buf, st ); ssl_errno = SSL_OK; if( st <= 0 ) { ((struct scd*)conn)->lasterr = SSL_get_error( ((struct scd*)conn)->ssl, st ); if( ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_READ || ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_WRITE ) ssl_errno = SSL_AGAIN; } return st; } int ssl_pending( void *conn ) { return ( ((struct scd*)conn) && ((struct scd*)conn)->established ) ? SSL_pending( ((struct scd*)conn)->ssl ) > 0 : 0; } static void ssl_conn_free( struct scd *conn ) { SSL_free( conn->ssl ); g_free( conn->hostname ); g_free( conn ); } void ssl_disconnect( void *conn_ ) { struct scd *conn = conn_; if( conn->inpa != -1 ) b_event_remove( conn->inpa ); if( conn->established ) SSL_shutdown( conn->ssl ); closesocket( conn->fd ); ssl_conn_free( conn ); } int ssl_getfd( void *conn ) { return( ((struct scd*)conn)->fd ); } b_input_condition ssl_getdirection( void *conn ) { return( ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_WRITE ? B_EV_IO_WRITE : B_EV_IO_READ ); } char *ssl_verify_strerror( int code ) { return g_strdup( "SSL certificate verification not supported by BitlBee OpenSSL code." ); } size_t ssl_des3_encrypt(const unsigned char *key, size_t key_len, const unsigned char *input, size_t input_len, const unsigned char *iv, unsigned char **res) { int output_length = 0; EVP_CIPHER_CTX ctx; *res = g_new0(unsigned char, 72); /* Don't set key or IV because we will modify the parameters */ EVP_CIPHER_CTX_init(&ctx); EVP_CipherInit_ex(&ctx, EVP_des_ede3_cbc(), NULL, NULL, NULL, 1); EVP_CIPHER_CTX_set_key_length(&ctx, key_len); EVP_CIPHER_CTX_set_padding(&ctx, 0); /* We finished modifying parameters so now we can set key and IV */ EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, 1); EVP_CipherUpdate(&ctx, *res, &output_length, input, input_len); EVP_CipherFinal_ex(&ctx, *res, &output_length); EVP_CIPHER_CTX_cleanup(&ctx); //EVP_cleanup(); return output_length; }


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