1 |
lefcha |
1.33 |
#include <stdio.h> |
2 |
lefcha |
1.1 |
#include <string.h> |
3 |
lefcha |
1.33 |
#include <unistd.h> |
4 |
lefcha |
1.1 |
#include <errno.h> |
5 |
|
|
#include <sys/types.h> |
6 |
|
|
#include <sys/socket.h> |
7 |
|
|
#include <netinet/in.h> |
8 |
|
|
#include <netdb.h> |
9 |
|
|
#include <fcntl.h> |
10 |
|
|
|
11 |
|
|
#include "config.h" |
12 |
|
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#include "imapfilter.h" |
13 |
|
|
|
14 |
|
|
#ifdef SSL_TLS |
15 |
|
|
#include <openssl/ssl.h> |
16 |
|
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#include <openssl/err.h> |
17 |
lefcha |
1.3 |
#include <openssl/x509.h> |
18 |
lefcha |
1.13 |
#endif |
19 |
|
|
|
20 |
lefcha |
1.33 |
|
21 |
lefcha |
1.28 |
extern unsigned int options; |
22 |
lefcha |
1.31 |
extern conn_t connpri, connaux; |
23 |
lefcha |
1.1 |
|
24 |
lefcha |
1.14 |
long timeout = -1; /* Server non-response timeout in seconds. */ |
25 |
lefcha |
1.1 |
|
26 |
lefcha |
1.25 |
|
27 |
lefcha |
1.1 |
/* |
28 |
|
|
* Connect to mail server. |
29 |
|
|
*/ |
30 |
lefcha |
1.26 |
int |
31 |
lefcha |
1.31 |
init_connection(conn_t * conn, char *serv, unsigned short int port, |
32 |
lefcha |
1.26 |
unsigned int protocol) |
33 |
lefcha |
1.1 |
{ |
34 |
lefcha |
1.26 |
struct sockaddr_in sa; |
35 |
|
|
struct hostent *he; |
36 |
|
|
|
37 |
lefcha |
1.32 |
#ifndef SSL_TLS |
38 |
lefcha |
1.26 |
if (protocol != SSL_DISABLED) { |
39 |
|
|
error("SSL not supported by this build\n"); |
40 |
|
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return ERROR_SSL; |
41 |
|
|
} |
42 |
lefcha |
1.32 |
#endif |
43 |
|
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|
44 |
lefcha |
1.26 |
memset((char *)&sa, 0, sizeof(struct sockaddr_in)); |
45 |
lefcha |
1.1 |
|
46 |
lefcha |
1.31 |
conn->sock = socket(PF_INET, SOCK_STREAM, 0); |
47 |
lefcha |
1.2 |
|
48 |
lefcha |
1.31 |
if (conn->sock < 0) { |
49 |
lefcha |
1.26 |
error("create socket; %s\n", strerror(errno)); |
50 |
|
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return ERROR_NETWORK; |
51 |
|
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} |
52 |
|
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if (!(he = gethostbyname(serv))) { |
53 |
|
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error("get network host entry of %s; %s\n", serv, |
54 |
|
|
strerror(errno)); |
55 |
lefcha |
1.31 |
close_connection(conn); |
56 |
lefcha |
1.26 |
return ERROR_NETWORK; |
57 |
|
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} |
58 |
|
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sa.sin_family = AF_INET; |
59 |
|
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sa.sin_port = htons(port); |
60 |
|
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sa.sin_addr = *(struct in_addr *) he->h_addr; |
61 |
|
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|
62 |
lefcha |
1.31 |
if (connect(conn->sock, (struct sockaddr *) & sa, |
63 |
|
|
sizeof(struct sockaddr))) { |
64 |
lefcha |
1.26 |
error("initiating connection to %s; %s\n", serv, |
65 |
|
|
strerror(errno)); |
66 |
lefcha |
1.31 |
close_connection(conn); |
67 |
lefcha |
1.26 |
return ERROR_NETWORK; |
68 |
|
|
} |
69 |
lefcha |
1.28 |
info("Connected to %s.\n", he->h_name); |
70 |
|
|
|
71 |
lefcha |
1.1 |
#ifdef SSL_TLS |
72 |
lefcha |
1.26 |
if (protocol != SSL_DISABLED) |
73 |
lefcha |
1.33 |
if (!init_secure_connection(conn, protocol)) |
74 |
lefcha |
1.26 |
return 0; |
75 |
lefcha |
1.28 |
else |
76 |
lefcha |
1.26 |
return ERROR_SSL; |
77 |
|
|
else |
78 |
lefcha |
1.31 |
conn->ssl = NULL; |
79 |
lefcha |
1.1 |
#endif |
80 |
|
|
|
81 |
lefcha |
1.26 |
return 0; |
82 |
lefcha |
1.1 |
} |
83 |
|
|
|
84 |
|
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|
85 |
|
|
#ifdef SSL_TLS |
86 |
|
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/* |
87 |
|
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* Initialize Secure Socket Layer connection. |
88 |
|
|
*/ |
89 |
lefcha |
1.26 |
int |
90 |
lefcha |
1.33 |
init_secure_connection(conn_t * conn, unsigned int protocol) |
91 |
lefcha |
1.1 |
{ |
92 |
lefcha |
1.26 |
int e; |
93 |
|
|
SSL_CTX *ctx; |
94 |
|
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SSL_METHOD *method; |
95 |
|
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|
96 |
|
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method = NULL; |
97 |
|
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|
98 |
|
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SSL_library_init(); |
99 |
lefcha |
1.30 |
SSL_load_error_strings(); |
100 |
lefcha |
1.26 |
|
101 |
|
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switch (protocol) { |
102 |
lefcha |
1.30 |
case SSL_TLS_V1: |
103 |
|
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method = TLSv1_client_method(); |
104 |
|
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break; |
105 |
lefcha |
1.26 |
case SSL_SSL_V2: |
106 |
|
|
case SSL_SSL_V3: |
107 |
lefcha |
1.30 |
method = SSLv23_client_method(); |
108 |
lefcha |
1.26 |
break; |
109 |
|
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} |
110 |
lefcha |
1.3 |
|
111 |
lefcha |
1.26 |
if (!(ctx = SSL_CTX_new(method))) |
112 |
lefcha |
1.30 |
goto fail; |
113 |
lefcha |
1.1 |
|
114 |
lefcha |
1.31 |
if (!(conn->ssl = SSL_new(ctx))) |
115 |
lefcha |
1.30 |
goto fail; |
116 |
lefcha |
1.26 |
|
117 |
lefcha |
1.31 |
SSL_set_fd(conn->ssl, conn->sock); |
118 |
lefcha |
1.26 |
|
119 |
lefcha |
1.31 |
if ((e = SSL_connect(conn->ssl)) <= 0) { |
120 |
|
|
SSL_get_error(conn->ssl, e); |
121 |
lefcha |
1.30 |
error("initiating SSL connection; %s\n", |
122 |
lefcha |
1.26 |
ERR_error_string(ERR_get_error(), NULL)); |
123 |
lefcha |
1.30 |
goto fail; |
124 |
lefcha |
1.26 |
} |
125 |
lefcha |
1.33 |
if (options & OPTION_DETAILS_VERBOSE) { |
126 |
|
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SSL_CIPHER *cipher; |
127 |
|
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char *ver; |
128 |
|
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const char *name; |
129 |
|
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int usebits, algbits; |
130 |
|
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|
131 |
|
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cipher = SSL_get_current_cipher(conn->ssl); |
132 |
|
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ver = SSL_CIPHER_get_version(cipher); |
133 |
|
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name = SSL_CIPHER_get_name(cipher); |
134 |
|
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usebits = SSL_CIPHER_get_bits(cipher, &algbits); |
135 |
|
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printf("SSL/TLS handshake completed: %s with cipher %s " |
136 |
|
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"(%d/%d bits).\n", ver, name, usebits, algbits); |
137 |
|
|
} |
138 |
|
|
if (get_cert(conn)) |
139 |
lefcha |
1.30 |
goto fail; |
140 |
lefcha |
1.26 |
|
141 |
|
|
SSL_CTX_free(ctx); |
142 |
|
|
|
143 |
|
|
return 0; |
144 |
lefcha |
1.30 |
|
145 |
|
|
fail: |
146 |
lefcha |
1.31 |
conn->ssl = NULL; |
147 |
lefcha |
1.30 |
SSL_CTX_free(ctx); |
148 |
|
|
|
149 |
|
|
return ERROR_SSL; |
150 |
lefcha |
1.1 |
} |
151 |
lefcha |
1.25 |
#endif /* SSL_TLS */ |
152 |
lefcha |
1.1 |
|
153 |
|
|
|
154 |
|
|
/* |
155 |
|
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* Disconnect from mail server. |
156 |
|
|
*/ |
157 |
lefcha |
1.26 |
int |
158 |
lefcha |
1.31 |
close_connection(conn_t * conn) |
159 |
lefcha |
1.1 |
{ |
160 |
lefcha |
1.31 |
if (conn->ssl) { |
161 |
|
|
SSL_shutdown(conn->ssl); |
162 |
|
|
SSL_free(conn->ssl); |
163 |
|
|
conn->ssl = NULL; |
164 |
lefcha |
1.26 |
} |
165 |
lefcha |
1.31 |
if (conn->sock >= 0 && close(conn->sock) == -1) { |
166 |
lefcha |
1.26 |
error("closing socket; %s\n", strerror(errno)); |
167 |
|
|
return ERROR_NETWORK; |
168 |
|
|
} else { |
169 |
lefcha |
1.31 |
conn->sock = -1; |
170 |
lefcha |
1.26 |
return 0; |
171 |
|
|
} |
172 |
lefcha |
1.1 |
} |
173 |
|
|
|
174 |
|
|
|
175 |
|
|
/* |
176 |
|
|
* Read data from socket. |
177 |
|
|
*/ |
178 |
lefcha |
1.26 |
int |
179 |
lefcha |
1.31 |
socket_read(conn_t * conn, char *buf) |
180 |
lefcha |
1.1 |
{ |
181 |
lefcha |
1.26 |
int f, e, s; |
182 |
|
|
fd_set fds; |
183 |
|
|
struct timeval tv; |
184 |
|
|
struct timeval *tvp; |
185 |
lefcha |
1.28 |
|
186 |
lefcha |
1.26 |
e = 0; |
187 |
|
|
s = 1; |
188 |
|
|
tvp = NULL; |
189 |
lefcha |
1.1 |
|
190 |
lefcha |
1.29 |
memset(buf, 0, RESPONSE_BUF + 1); |
191 |
lefcha |
1.1 |
|
192 |
lefcha |
1.26 |
if (timeout >= 0) { |
193 |
|
|
tv.tv_sec = timeout; |
194 |
|
|
tv.tv_usec = 0; |
195 |
|
|
tvp = &tv; |
196 |
|
|
} |
197 |
lefcha |
1.31 |
f = fcntl(conn->sock, F_GETFL, 0); |
198 |
|
|
fcntl(conn->sock, F_SETFL, f | O_NONBLOCK); |
199 |
lefcha |
1.1 |
|
200 |
lefcha |
1.26 |
FD_ZERO(&fds); |
201 |
lefcha |
1.31 |
FD_SET(conn->sock, &fds); |
202 |
lefcha |
1.1 |
|
203 |
|
|
#ifdef SSL_TLS |
204 |
lefcha |
1.31 |
if (conn->ssl) { |
205 |
|
|
while (SSL_pending(conn->ssl) > 0 || |
206 |
|
|
((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
207 |
|
|
FD_ISSET(conn->sock, &fds))) { |
208 |
|
|
e = SSL_read(conn->ssl, buf, RESPONSE_BUF); |
209 |
lefcha |
1.26 |
|
210 |
|
|
if (e > 0) |
211 |
|
|
break; |
212 |
|
|
|
213 |
lefcha |
1.31 |
switch (SSL_get_error(conn->ssl, e)) { |
214 |
lefcha |
1.26 |
case SSL_ERROR_WANT_READ: |
215 |
|
|
case SSL_ERROR_WANT_WRITE: |
216 |
|
|
continue; |
217 |
|
|
case SSL_ERROR_ZERO_RETURN: |
218 |
|
|
return ERROR_NETWORK; |
219 |
|
|
case SSL_ERROR_SYSCALL: |
220 |
|
|
case SSL_ERROR_SSL: |
221 |
lefcha |
1.30 |
fatal(ERROR_NETWORK, "reading data; %s\n", |
222 |
lefcha |
1.26 |
ERR_error_string(ERR_get_error(), NULL)); |
223 |
|
|
default: |
224 |
|
|
fatal(ERROR_NETWORK, |
225 |
|
|
"undefined ssl error while reading data\n"); |
226 |
|
|
} |
227 |
|
|
} |
228 |
|
|
} else |
229 |
|
|
#endif |
230 |
|
|
{ |
231 |
lefcha |
1.31 |
if ((s = select(conn->sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
232 |
|
|
FD_ISSET(conn->sock, &fds)) |
233 |
|
|
e = read(conn->sock, buf, RESPONSE_BUF); |
234 |
lefcha |
1.26 |
|
235 |
|
|
if (e == -1) |
236 |
|
|
fatal(ERROR_NETWORK, "reading data; %s", |
237 |
|
|
strerror(errno)); |
238 |
|
|
else if (e == 0) |
239 |
|
|
return ERROR_NETWORK; |
240 |
|
|
} |
241 |
lefcha |
1.21 |
|
242 |
lefcha |
1.31 |
fcntl(conn->sock, F_SETFL, f); |
243 |
lefcha |
1.21 |
|
244 |
lefcha |
1.26 |
if (s == -1) |
245 |
|
|
fatal(ERROR_NETWORK, "waiting to read from socket; %s\n", |
246 |
|
|
strerror(errno)); |
247 |
|
|
else if (s == 0) |
248 |
lefcha |
1.21 |
fatal(ERROR_NETWORK, |
249 |
lefcha |
1.26 |
"timeout period expired while waiting to read " |
250 |
|
|
"data\n"); |
251 |
lefcha |
1.1 |
|
252 |
lefcha |
1.26 |
return 0; |
253 |
lefcha |
1.1 |
} |
254 |
|
|
|
255 |
|
|
|
256 |
|
|
/* |
257 |
|
|
* Write data to socket. |
258 |
|
|
*/ |
259 |
lefcha |
1.26 |
int |
260 |
lefcha |
1.31 |
socket_write(conn_t * conn, char *data) |
261 |
lefcha |
1.1 |
{ |
262 |
lefcha |
1.26 |
int f, e, s; |
263 |
|
|
fd_set fds; |
264 |
|
|
struct timeval tv; |
265 |
|
|
struct timeval *tvp = NULL; |
266 |
lefcha |
1.28 |
|
267 |
lefcha |
1.26 |
e = 0; |
268 |
|
|
s = 1; |
269 |
lefcha |
1.21 |
|
270 |
lefcha |
1.26 |
if (timeout >= 0) { |
271 |
|
|
tv.tv_sec = timeout; |
272 |
|
|
tv.tv_usec = 0; |
273 |
|
|
tvp = &tv; |
274 |
|
|
} |
275 |
lefcha |
1.31 |
f = fcntl(conn->sock, F_GETFL, 0); |
276 |
|
|
fcntl(conn->sock, F_SETFL, f | O_NONBLOCK); |
277 |
lefcha |
1.21 |
|
278 |
lefcha |
1.26 |
FD_ZERO(&fds); |
279 |
lefcha |
1.31 |
FD_SET(conn->sock, &fds); |
280 |
lefcha |
1.1 |
|
281 |
lefcha |
1.21 |
#ifdef SSL_TLS |
282 |
lefcha |
1.31 |
if (conn->ssl) { |
283 |
|
|
while ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp) > 0 && |
284 |
|
|
FD_ISSET(conn->sock, &fds))) { |
285 |
|
|
e = SSL_write(conn->ssl, data, strlen(data)); |
286 |
lefcha |
1.26 |
|
287 |
|
|
if (e > 0) |
288 |
|
|
break; |
289 |
|
|
|
290 |
lefcha |
1.31 |
switch (SSL_get_error(conn->ssl, e)) { |
291 |
lefcha |
1.26 |
case SSL_ERROR_WANT_READ: |
292 |
|
|
case SSL_ERROR_WANT_WRITE: |
293 |
|
|
continue; |
294 |
|
|
case SSL_ERROR_ZERO_RETURN: |
295 |
|
|
return ERROR_NETWORK; |
296 |
|
|
case SSL_ERROR_SYSCALL: |
297 |
|
|
case SSL_ERROR_SSL: |
298 |
lefcha |
1.30 |
fatal(ERROR_NETWORK, "writing data; %s\n", |
299 |
lefcha |
1.26 |
ERR_error_string(ERR_get_error(), NULL)); |
300 |
|
|
default: |
301 |
|
|
fatal(ERROR_NETWORK, |
302 |
|
|
"undefined ssl error while writing data\n"); |
303 |
|
|
} |
304 |
|
|
} |
305 |
|
|
} else |
306 |
|
|
#endif |
307 |
|
|
{ |
308 |
lefcha |
1.31 |
if ((s = select(conn->sock + 1, NULL, &fds, NULL, tvp)) > 0 && |
309 |
|
|
FD_ISSET(conn->sock, &fds)) |
310 |
|
|
e = write(conn->sock, data, strlen(data)); |
311 |
lefcha |
1.26 |
|
312 |
|
|
if (e == -1) |
313 |
|
|
fatal(ERROR_NETWORK, "writing data; %s", |
314 |
|
|
strerror(errno)); |
315 |
|
|
} |
316 |
lefcha |
1.21 |
|
317 |
lefcha |
1.31 |
fcntl(conn->sock, F_SETFL, f); |
318 |
lefcha |
1.21 |
|
319 |
lefcha |
1.26 |
if (s == -1) |
320 |
|
|
fatal(ERROR_NETWORK, "waiting to write to socket; %s\n", |
321 |
|
|
strerror(errno)); |
322 |
|
|
else if (s == 0) |
323 |
lefcha |
1.21 |
fatal(ERROR_NETWORK, |
324 |
lefcha |
1.26 |
"timeout period expired while waiting to write " |
325 |
|
|
"data\n"); |
326 |
lefcha |
1.2 |
|
327 |
lefcha |
1.26 |
return 0; |
328 |
lefcha |
1.1 |
} |