[b7d3cc34] | 1 | /********************************************************************\ |
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| 2 | * BitlBee -- An IRC to other IM-networks gateway * |
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| 3 | * * |
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| 4 | * Copyright 2002-2004 Wilmer van der Gaast and others * |
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| 5 | \********************************************************************/ |
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| 6 | |
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[26fdfc5] | 7 | /* SSL module - OpenSSL version */ |
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[b7d3cc34] | 8 | |
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| 9 | /* |
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| 10 | This program is free software; you can redistribute it and/or modify |
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| 11 | it under the terms of the GNU General Public License as published by |
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| 12 | the Free Software Foundation; either version 2 of the License, or |
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| 13 | (at your option) any later version. |
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| 14 | |
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| 15 | This program is distributed in the hope that it will be useful, |
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| 16 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 17 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 18 | GNU General Public License for more details. |
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| 19 | |
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| 20 | You should have received a copy of the GNU General Public License with |
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| 21 | the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL; |
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| 22 | if not, write to the Free Software Foundation, Inc., 59 Temple Place, |
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| 23 | Suite 330, Boston, MA 02111-1307 USA |
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| 24 | */ |
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| 25 | |
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| 26 | #include <openssl/crypto.h> |
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| 27 | #include <openssl/rand.h> |
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| 28 | #include <openssl/x509.h> |
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| 29 | #include <openssl/pem.h> |
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| 30 | #include <openssl/ssl.h> |
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| 31 | #include <openssl/err.h> |
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| 32 | |
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[59c03bd] | 33 | #include "bitlbee.h" |
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[b7d3cc34] | 34 | #include "proxy.h" |
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| 35 | #include "ssl_client.h" |
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| 36 | #include "sock.h" |
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| 37 | |
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[701acdd4] | 38 | int ssl_errno = 0; |
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| 39 | |
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[b7d3cc34] | 40 | static gboolean initialized = FALSE; |
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| 41 | |
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| 42 | struct scd |
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| 43 | { |
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[26fdfc5] | 44 | ssl_input_function func; |
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[b7d3cc34] | 45 | gpointer data; |
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| 46 | int fd; |
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| 47 | gboolean established; |
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[486ddb5] | 48 | gboolean verify; |
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[3f661849] | 49 | char *hostname; |
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[b7d3cc34] | 50 | |
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[26fdfc5] | 51 | int inpa; |
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| 52 | int lasterr; /* Necessary for SSL_get_error */ |
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[b7d3cc34] | 53 | SSL *ssl; |
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| 54 | SSL_CTX *ssl_ctx; |
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| 55 | }; |
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| 56 | |
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[3f661849] | 57 | static void ssl_conn_free( struct scd *conn ); |
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[309cb9e] | 58 | static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond ); |
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[f920d9e] | 59 | static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond ); |
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| 60 | static gboolean ssl_handshake( gpointer data, gint source, b_input_condition cond ); |
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[b7d3cc34] | 61 | |
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| 62 | |
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[9730d72] | 63 | void ssl_init( void ) |
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[ba5add7] | 64 | { |
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| 65 | initialized = TRUE; |
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[8e9e2b7] | 66 | SSL_library_init(); |
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| 67 | // SSLeay_add_ssl_algorithms(); |
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[ba5add7] | 68 | } |
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| 69 | |
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[a72dc2b] | 70 | void *ssl_connect( char *host, int port, gboolean verify, ssl_input_function func, gpointer data ) |
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[b7d3cc34] | 71 | { |
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| 72 | struct scd *conn = g_new0( struct scd, 1 ); |
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| 73 | |
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| 74 | conn->fd = proxy_connect( host, port, ssl_connected, conn ); |
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| 75 | if( conn->fd < 0 ) |
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| 76 | { |
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[3f661849] | 77 | ssl_conn_free( conn ); |
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[f920d9e] | 78 | return NULL; |
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[b7d3cc34] | 79 | } |
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| 80 | |
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[8a2221a7] | 81 | conn->func = func; |
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| 82 | conn->data = data; |
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| 83 | conn->inpa = -1; |
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[3f661849] | 84 | conn->hostname = g_strdup( host ); |
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[8a2221a7] | 85 | |
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[f920d9e] | 86 | return conn; |
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| 87 | } |
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| 88 | |
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[486ddb5] | 89 | void *ssl_starttls( int fd, char *hostname, gboolean verify, ssl_input_function func, gpointer data ) |
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[f920d9e] | 90 | { |
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| 91 | struct scd *conn = g_new0( struct scd, 1 ); |
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| 92 | |
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| 93 | conn->fd = fd; |
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| 94 | conn->func = func; |
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| 95 | conn->data = data; |
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| 96 | conn->inpa = -1; |
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[200e151] | 97 | conn->verify = verify && global.conf->cafile; |
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[3f661849] | 98 | conn->hostname = g_strdup( hostname ); |
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[f920d9e] | 99 | |
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| 100 | /* This function should be called via a (short) timeout instead of |
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| 101 | directly from here, because these SSL calls are *supposed* to be |
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| 102 | *completely* asynchronous and not ready yet when this function |
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| 103 | (or *_connect, for examle) returns. Also, errors are reported via |
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| 104 | the callback function, not via this function's return value. |
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| 105 | |
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| 106 | In short, doing things like this makes the rest of the code a lot |
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| 107 | simpler. */ |
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| 108 | |
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| 109 | b_timeout_add( 1, ssl_starttls_real, conn ); |
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| 110 | |
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| 111 | return conn; |
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| 112 | } |
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| 113 | |
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| 114 | static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond ) |
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| 115 | { |
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| 116 | struct scd *conn = data; |
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| 117 | |
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[e046390] | 118 | return ssl_connected( conn, conn->fd, B_EV_IO_WRITE ); |
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[f920d9e] | 119 | } |
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| 120 | |
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| 121 | static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond ) |
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| 122 | { |
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| 123 | struct scd *conn = data; |
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[59c03bd] | 124 | const SSL_METHOD *meth; |
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[f920d9e] | 125 | |
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[486ddb5] | 126 | if( conn->verify ) |
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| 127 | { |
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[3f661849] | 128 | /* Right now we don't have any verification functionality for OpenSSL. */ |
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[200e151] | 129 | conn->func( conn->data, 1, NULL, cond ); |
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[486ddb5] | 130 | if( source >= 0 ) closesocket( source ); |
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[3f661849] | 131 | ssl_conn_free( conn ); |
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[486ddb5] | 132 | |
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| 133 | return FALSE; |
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| 134 | } |
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| 135 | |
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[f920d9e] | 136 | if( source == -1 ) |
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| 137 | goto ssl_connected_failure; |
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| 138 | |
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[b7d3cc34] | 139 | if( !initialized ) |
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| 140 | { |
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[ba5add7] | 141 | ssl_init(); |
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[b7d3cc34] | 142 | } |
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| 143 | |
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| 144 | meth = TLSv1_client_method(); |
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| 145 | conn->ssl_ctx = SSL_CTX_new( meth ); |
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| 146 | if( conn->ssl_ctx == NULL ) |
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[f920d9e] | 147 | goto ssl_connected_failure; |
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[b7d3cc34] | 148 | |
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| 149 | conn->ssl = SSL_new( conn->ssl_ctx ); |
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| 150 | if( conn->ssl == NULL ) |
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[f920d9e] | 151 | goto ssl_connected_failure; |
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[b7d3cc34] | 152 | |
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[309cb9e] | 153 | /* We can do at least the handshake with non-blocking I/O */ |
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[26fdfc5] | 154 | sock_make_nonblocking( conn->fd ); |
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[b7d3cc34] | 155 | SSL_set_fd( conn->ssl, conn->fd ); |
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| 156 | |
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[3f661849] | 157 | if( conn->hostname && !isdigit( conn->hostname[0] ) ) |
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| 158 | SSL_set_tlsext_host_name( conn->ssl, conn->hostname ); |
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| 159 | |
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[26fdfc5] | 160 | return ssl_handshake( data, source, cond ); |
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[f920d9e] | 161 | |
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| 162 | ssl_connected_failure: |
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[486ddb5] | 163 | conn->func( conn->data, 0, NULL, cond ); |
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[3f661849] | 164 | ssl_disconnect( conn ); |
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[f920d9e] | 165 | return FALSE; |
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| 166 | |
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[26fdfc5] | 167 | } |
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| 168 | |
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[309cb9e] | 169 | static gboolean ssl_handshake( gpointer data, gint source, b_input_condition cond ) |
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[26fdfc5] | 170 | { |
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| 171 | struct scd *conn = data; |
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| 172 | int st; |
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| 173 | |
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| 174 | if( ( st = SSL_connect( conn->ssl ) ) < 0 ) |
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| 175 | { |
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| 176 | conn->lasterr = SSL_get_error( conn->ssl, st ); |
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| 177 | if( conn->lasterr != SSL_ERROR_WANT_READ && conn->lasterr != SSL_ERROR_WANT_WRITE ) |
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[f920d9e] | 178 | { |
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[486ddb5] | 179 | conn->func( conn->data, 0, NULL, cond ); |
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[3f661849] | 180 | ssl_disconnect( conn ); |
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[f920d9e] | 181 | return FALSE; |
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| 182 | } |
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[26fdfc5] | 183 | |
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[309cb9e] | 184 | conn->inpa = b_input_add( conn->fd, ssl_getdirection( conn ), ssl_handshake, data ); |
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| 185 | return FALSE; |
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[26fdfc5] | 186 | } |
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[b7d3cc34] | 187 | |
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| 188 | conn->established = TRUE; |
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[26fdfc5] | 189 | sock_make_blocking( conn->fd ); /* For now... */ |
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[486ddb5] | 190 | conn->func( conn->data, 0, conn, cond ); |
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[309cb9e] | 191 | return FALSE; |
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[b7d3cc34] | 192 | } |
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| 193 | |
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| 194 | int ssl_read( void *conn, char *buf, int len ) |
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| 195 | { |
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[26fdfc5] | 196 | int st; |
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| 197 | |
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[b7d3cc34] | 198 | if( !((struct scd*)conn)->established ) |
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[26fdfc5] | 199 | { |
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| 200 | ssl_errno = SSL_NOHANDSHAKE; |
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| 201 | return -1; |
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| 202 | } |
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| 203 | |
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| 204 | st = SSL_read( ((struct scd*)conn)->ssl, buf, len ); |
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[b7d3cc34] | 205 | |
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[26fdfc5] | 206 | ssl_errno = SSL_OK; |
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| 207 | if( st <= 0 ) |
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| 208 | { |
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| 209 | ((struct scd*)conn)->lasterr = SSL_get_error( ((struct scd*)conn)->ssl, st ); |
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| 210 | if( ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_READ || ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_WRITE ) |
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| 211 | ssl_errno = SSL_AGAIN; |
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| 212 | } |
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| 213 | |
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[327af51] | 214 | if( 0 && getenv( "BITLBEE_DEBUG" ) && st > 0 ) write( 1, buf, st ); |
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[50b8978] | 215 | |
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[26fdfc5] | 216 | return st; |
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[b7d3cc34] | 217 | } |
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| 218 | |
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| 219 | int ssl_write( void *conn, const char *buf, int len ) |
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| 220 | { |
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[26fdfc5] | 221 | int st; |
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| 222 | |
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[b7d3cc34] | 223 | if( !((struct scd*)conn)->established ) |
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[26fdfc5] | 224 | { |
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| 225 | ssl_errno = SSL_NOHANDSHAKE; |
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| 226 | return -1; |
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| 227 | } |
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| 228 | |
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| 229 | st = SSL_write( ((struct scd*)conn)->ssl, buf, len ); |
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[b7d3cc34] | 230 | |
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[327af51] | 231 | if( 0 && getenv( "BITLBEE_DEBUG" ) && st > 0 ) write( 1, buf, st ); |
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[50b8978] | 232 | |
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[26fdfc5] | 233 | ssl_errno = SSL_OK; |
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| 234 | if( st <= 0 ) |
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| 235 | { |
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| 236 | ((struct scd*)conn)->lasterr = SSL_get_error( ((struct scd*)conn)->ssl, st ); |
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| 237 | if( ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_READ || ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_WRITE ) |
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| 238 | ssl_errno = SSL_AGAIN; |
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| 239 | } |
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| 240 | |
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| 241 | return st; |
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[b7d3cc34] | 242 | } |
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| 243 | |
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[8a2221a7] | 244 | int ssl_pending( void *conn ) |
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| 245 | { |
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| 246 | return ( ((struct scd*)conn) && ((struct scd*)conn)->established ) ? |
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| 247 | SSL_pending( ((struct scd*)conn)->ssl ) > 0 : 0; |
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| 248 | } |
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| 249 | |
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[3f661849] | 250 | static void ssl_conn_free( struct scd *conn ) |
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| 251 | { |
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| 252 | SSL_free( conn->ssl ); |
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| 253 | SSL_CTX_free( conn->ssl_ctx ); |
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| 254 | g_free( conn->hostname ); |
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| 255 | g_free( conn ); |
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| 256 | |
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| 257 | } |
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| 258 | |
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[b7d3cc34] | 259 | void ssl_disconnect( void *conn_ ) |
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| 260 | { |
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| 261 | struct scd *conn = conn_; |
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| 262 | |
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[26fdfc5] | 263 | if( conn->inpa != -1 ) |
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[309cb9e] | 264 | b_event_remove( conn->inpa ); |
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[26fdfc5] | 265 | |
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[b7d3cc34] | 266 | if( conn->established ) |
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| 267 | SSL_shutdown( conn->ssl ); |
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| 268 | |
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| 269 | closesocket( conn->fd ); |
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| 270 | |
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[3f661849] | 271 | ssl_conn_free( conn ); |
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[b7d3cc34] | 272 | } |
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| 273 | |
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| 274 | int ssl_getfd( void *conn ) |
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| 275 | { |
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| 276 | return( ((struct scd*)conn)->fd ); |
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| 277 | } |
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[26fdfc5] | 278 | |
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[ba9edaa] | 279 | b_input_condition ssl_getdirection( void *conn ) |
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[26fdfc5] | 280 | { |
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[e046390] | 281 | return( ((struct scd*)conn)->lasterr == SSL_ERROR_WANT_WRITE ? B_EV_IO_WRITE : B_EV_IO_READ ); |
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[26fdfc5] | 282 | } |
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[523fb23] | 283 | |
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[78b8401] | 284 | char *ssl_verify_strerror( int code ) |
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| 285 | { |
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| 286 | return g_strdup( "SSL certificate verification not supported by BitlBee OpenSSL code." ); |
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| 287 | } |
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| 288 | |
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[523fb23] | 289 | 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) |
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| 290 | { |
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| 291 | int output_length = 0; |
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[50b8978] | 292 | EVP_CIPHER_CTX ctx; |
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[523fb23] | 293 | |
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| 294 | *res = g_new0(unsigned char, 72); |
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| 295 | |
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| 296 | /* Don't set key or IV because we will modify the parameters */ |
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| 297 | EVP_CIPHER_CTX_init(&ctx); |
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| 298 | EVP_CipherInit_ex(&ctx, EVP_des_ede3_cbc(), NULL, NULL, NULL, 1); |
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| 299 | EVP_CIPHER_CTX_set_key_length(&ctx, key_len); |
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| 300 | EVP_CIPHER_CTX_set_padding(&ctx, 0); |
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| 301 | /* We finished modifying parameters so now we can set key and IV */ |
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| 302 | EVP_CipherInit_ex(&ctx, NULL, NULL, key, iv, 1); |
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| 303 | EVP_CipherUpdate(&ctx, *res, &output_length, input, input_len); |
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| 304 | EVP_CipherFinal_ex(&ctx, *res, &output_length); |
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| 305 | EVP_CIPHER_CTX_cleanup(&ctx); |
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[50b8978] | 306 | //EVP_cleanup(); |
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[523fb23] | 307 | |
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| 308 | return output_length; |
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| 309 | } |
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