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 | |
---|
43 | int ssl_errno = 0; |
---|
44 | |
---|
45 | static gboolean initialized = FALSE; |
---|
46 | |
---|
47 | struct scd |
---|
48 | { |
---|
49 | ssl_input_function func; |
---|
50 | gpointer data; |
---|
51 | int fd; |
---|
52 | PRFileDesc *prfd; |
---|
53 | gboolean established; |
---|
54 | gboolean verify; |
---|
55 | }; |
---|
56 | |
---|
57 | static gboolean ssl_connected( gpointer data, gint source, b_input_condition cond ); |
---|
58 | static gboolean ssl_starttls_real( gpointer data, gint source, b_input_condition cond ); |
---|
59 | |
---|
60 | |
---|
61 | static SECStatus nss_auth_cert (void *arg, PRFileDesc *socket, PRBool checksig, PRBool isserver) |
---|
62 | { |
---|
63 | return SECSuccess; |
---|
64 | } |
---|
65 | |
---|
66 | static 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 | |
---|
97 | void 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 | |
---|
105 | void *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 | |
---|
128 | static 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 | |
---|
135 | void *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 | |
---|
158 | static 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 | |
---|
206 | int 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 | |
---|
214 | int 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 | |
---|
222 | int 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 | |
---|
233 | void 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 | |
---|
243 | int ssl_getfd( void *conn ) |
---|
244 | { |
---|
245 | return( ((struct scd*)conn)->fd ); |
---|
246 | } |
---|
247 | |
---|
248 | b_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 | |
---|
254 | char *ssl_verify_strerror( int code ) |
---|
255 | { |
---|
256 | return g_strdup( "SSL certificate verification not supported by BitlBee NSS code." ); |
---|
257 | } |
---|