source: lib/ssl_nss.c @ 164352e

Last change on this file since 164352e was 200e151, checked in by Wilmer van der Gaast <wilmer@…>, at 2011-12-23T22:40:17Z

tls_verify correction: Don't fail cert verification in non-GnuTLS modules
unless "cafile" setting is enabled.

  • Property mode set to 100644
File size: 6.3 KB
Line 
1  /********************************************************************\
2  * BitlBee -- An IRC to other IM-networks gateway                     *
3  *                                                                    *
4  * Copyright 2002-2005 Wilmer van der Gaast and others                *
5  \********************************************************************/
6
7/* SSL module - NSS version                                             */
8
9/* Copyright 2005 Jelmer Vernooij                                       */
10
11/*
12  This program is free software; you can redistribute it and/or modify
13  it under the terms of the GNU General Public License as published by
14  the Free Software Foundation; either version 2 of the License, or
15  (at your option) any later version.
16
17  This program is distributed in the hope that it will be useful,
18  but WITHOUT ANY WARRANTY; without even the implied warranty of
19  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
20  GNU General Public License for more details.
21
22  You should have received a copy of the GNU General Public License with
23  the Debian GNU/Linux distribution in /usr/share/common-licenses/GPL;
24  if not, write to the Free Software Foundation, Inc., 59 Temple Place,
25  Suite 330, Boston, MA  02111-1307  USA
26*/
27
28#include "bitlbee.h"
29#include "proxy.h"
30#include "ssl_client.h"
31#include "sock.h"
32#include <nspr.h>
33#include <prio.h>
34#include <sslproto.h>
35#include <nss.h>
36#include <pk11pub.h>
37#include <private/pprio.h>
38#include <ssl.h>
39#include <seccomon.h>
40#include <secerr.h>
41#include <sslerr.h>
42
43int ssl_errno = 0;
44
45static gboolean initialized = FALSE;
46
47struct scd
48{
49        ssl_input_function func;
50        gpointer data;
51        int fd;
52        PRFileDesc *prfd;
53        gboolean established;
54        gboolean verify;
55};
56
57static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond );
58static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond );
59
60
61static SECStatus nss_auth_cert (void *arg, PRFileDesc *socket, PRBool checksig, PRBool isserver)
62{
63        return SECSuccess;
64}
65
66static SECStatus nss_bad_cert (void *arg, PRFileDesc *socket) 
67{
68        PRErrorCode err;
69
70        if(!arg) return SECFailure;
71
72        *(PRErrorCode *)arg = err = PORT_GetError();
73
74        switch(err) {
75        case SEC_ERROR_INVALID_AVA:
76        case SEC_ERROR_INVALID_TIME:
77        case SEC_ERROR_BAD_SIGNATURE:
78        case SEC_ERROR_EXPIRED_CERTIFICATE:
79        case SEC_ERROR_UNKNOWN_ISSUER:
80        case SEC_ERROR_UNTRUSTED_CERT:
81        case SEC_ERROR_CERT_VALID:
82        case SEC_ERROR_EXPIRED_ISSUER_CERTIFICATE:
83        case SEC_ERROR_CRL_EXPIRED:
84        case SEC_ERROR_CRL_BAD_SIGNATURE:
85        case SEC_ERROR_EXTENSION_VALUE_INVALID:
86        case SEC_ERROR_CA_CERT_INVALID:
87        case SEC_ERROR_CERT_USAGES_INVALID:
88        case SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION:
89                return SECSuccess;
90
91        default:
92                return SECFailure;
93        }
94}
95
96
97void ssl_init( void )
98{
99        PR_Init( PR_SYSTEM_THREAD, PR_PRIORITY_NORMAL, 1);
100        NSS_NoDB_Init(NULL);
101        NSS_SetDomesticPolicy();
102        initialized = TRUE;
103}
104
105void *ssl_connect( char *host, int port, gboolean verify, ssl_input_function func, gpointer data )
106{
107        struct scd *conn = g_new0( struct scd, 1 );
108       
109        conn->fd = proxy_connect( host, port, ssl_connected, conn );
110        conn->func = func;
111        conn->data = data;
112       
113        if( conn->fd < 0 )
114        {
115                g_free( conn );
116                return( NULL );
117        }
118       
119        if( !initialized )
120        {
121                ssl_init();
122        }
123
124       
125        return( conn );
126}
127
128static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond )
129{
130        struct scd *conn = data;
131
132        return ssl_connected( conn, conn->fd, B_EV_IO_WRITE );
133}
134
135void *ssl_starttls( int fd, char *hostname, gboolean verify, ssl_input_function func, gpointer data )
136{
137        struct scd *conn = g_new0( struct scd, 1 );
138
139        conn->fd = fd;
140        conn->func = func;
141        conn->data = data;
142        conn->verify = verify && global.conf->cafile;
143
144        /* This function should be called via a (short) timeout instead of
145           directly from here, because these SSL calls are *supposed* to be
146           *completely* asynchronous and not ready yet when this function
147           (or *_connect, for examle) returns. Also, errors are reported via
148           the callback function, not via this function's return value.
149
150           In short, doing things like this makes the rest of the code a lot
151           simpler. */
152
153        b_timeout_add( 1, ssl_starttls_real, conn );
154
155        return conn;
156}
157
158static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond )
159{
160        struct scd *conn = data;
161       
162        /* Right now we don't have any verification functionality for NSS. */
163
164        if( conn->verify )
165        {
166                conn->func( conn->data, 1, NULL, cond );
167                if( source >= 0 ) closesocket( source );
168                g_free( conn );
169
170                return FALSE;
171        }
172       
173        if( source == -1 )
174                goto ssl_connected_failure;
175       
176        /* Until we find out how to handle non-blocking I/O with NSS... */
177        sock_make_blocking( conn->fd );
178       
179        conn->prfd = SSL_ImportFD(NULL, PR_ImportTCPSocket(source));
180        SSL_OptionSet(conn->prfd, SSL_SECURITY, PR_TRUE);
181        SSL_OptionSet(conn->prfd, SSL_HANDSHAKE_AS_CLIENT, PR_TRUE);
182        SSL_BadCertHook(conn->prfd, (SSLBadCertHandler)nss_bad_cert, NULL);
183        SSL_AuthCertificateHook(conn->prfd, (SSLAuthCertificate)nss_auth_cert, (void *)CERT_GetDefaultCertDB());
184        SSL_ResetHandshake(conn->prfd, PR_FALSE);
185
186        if (SSL_ForceHandshake(conn->prfd)) {
187                goto ssl_connected_failure;
188        }
189       
190       
191        conn->established = TRUE;
192        conn->func( conn->data, 0, conn, cond );
193        return FALSE;
194       
195        ssl_connected_failure:
196       
197        conn->func( conn->data, 0, NULL, cond );
198       
199        PR_Close( conn -> prfd );
200        if( source >= 0 ) closesocket( source );
201        g_free( conn );
202       
203        return FALSE;
204}
205
206int ssl_read( void *conn, char *buf, int len )
207{
208        if( !((struct scd*)conn)->established )
209                return( 0 );
210       
211        return( PR_Read( ((struct scd*)conn)->prfd, buf, len ) );
212}
213
214int ssl_write( void *conn, const char *buf, int len )
215{
216        if( !((struct scd*)conn)->established )
217                return( 0 );
218       
219        return( PR_Write ( ((struct scd*)conn)->prfd, buf, len ) );
220}
221
222int ssl_pending( void *conn )
223{
224        struct scd *c = (struct scd *) conn;
225
226        if( c == NULL ) {
227                return 0;
228        }
229
230        return ( c->established && SSL_DataPending( c->prfd ) > 0 );
231}
232
233void ssl_disconnect( void *conn_ )
234{
235        struct scd *conn = conn_;
236       
237        PR_Close( conn->prfd );
238        closesocket( conn->fd );
239       
240        g_free( conn );
241}
242
243int ssl_getfd( void *conn )
244{
245        return( ((struct scd*)conn)->fd );
246}
247
248b_input_condition ssl_getdirection( void *conn )
249{
250        /* Just in case someone calls us, let's return the most likely case: */
251        return B_EV_IO_READ;
252}
253
254char *ssl_verify_strerror( int code )
255{
256        return g_strdup( "SSL certificate verification not supported by BitlBee NSS code." );
257}
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