1 |
lefcha |
1.1 |
#include <string.h> |
2 |
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#include <errno.h> |
3 |
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#include <unistd.h> |
4 |
lefcha |
1.10 |
#include <sys/time.h> |
5 |
lefcha |
1.1 |
#include <sys/types.h> |
6 |
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#include <sys/socket.h> |
7 |
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#include <netinet/in.h> |
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#include <netdb.h> |
9 |
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#include <fcntl.h> |
10 |
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11 |
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#include "config.h" |
12 |
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#include "imapfilter.h" |
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14 |
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#ifdef SSL_TLS |
15 |
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#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 |
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|
20 |
lefcha |
1.1 |
|
21 |
lefcha |
1.14 |
long timeout = -1; /* Server non-response timeout in seconds. */ |
22 |
lefcha |
1.1 |
|
23 |
lefcha |
1.18 |
int sockpri = -1; /* Main socket used mostly. */ |
24 |
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int sockaux = -1; /* Auxiliary socked used when another |
25 |
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connection is needed. */ |
26 |
lefcha |
1.13 |
#ifdef SSL_TLS |
27 |
lefcha |
1.19.2.1 |
static SSL *sslpri = NULL; |
28 |
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static SSL *sslaux = NULL; |
29 |
lefcha |
1.1 |
#endif |
30 |
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31 |
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32 |
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/* |
33 |
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* Connect to mail server. |
34 |
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*/ |
35 |
lefcha |
1.18 |
int init_connection(int *sock, char *serv, unsigned short int port, |
36 |
lefcha |
1.14 |
unsigned int protocol) |
37 |
lefcha |
1.1 |
{ |
38 |
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struct sockaddr_in sa; |
39 |
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struct hostent *he; |
40 |
lefcha |
1.19.2.1 |
#ifdef SSL_TLS |
41 |
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SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
42 |
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#else |
43 |
lefcha |
1.17 |
if (protocol != SSL_DISABLED) { |
44 |
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error("imapfilter: SSL not supported by this build\n"); |
45 |
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return ERROR_SSL; |
46 |
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} |
47 |
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#endif |
48 |
lefcha |
1.1 |
|
49 |
lefcha |
1.19 |
memset((char *)&sa, 0, sizeof(struct sockaddr_in)); |
50 |
lefcha |
1.1 |
|
51 |
lefcha |
1.18 |
*sock = socket(PF_INET, SOCK_STREAM, 0); |
52 |
lefcha |
1.1 |
|
53 |
lefcha |
1.18 |
if (*sock < 0) { |
54 |
lefcha |
1.1 |
error("imapfilter: create socket; %s\n", strerror(errno)); |
55 |
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return ERROR_NETWORK; |
56 |
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} |
57 |
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if (!(he = gethostbyname(serv))) { |
58 |
lefcha |
1.12 |
error("imapfilter: get network host entry of %s; %s\n", serv, |
59 |
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strerror(errno)); |
60 |
lefcha |
1.18 |
close_connection(sock); |
61 |
lefcha |
1.1 |
return ERROR_NETWORK; |
62 |
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} |
63 |
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sa.sin_family = AF_INET; |
64 |
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sa.sin_port = htons(port); |
65 |
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sa.sin_addr = *(struct in_addr *) he->h_addr; |
66 |
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|
67 |
lefcha |
1.9 |
xstrncpy(serv, he->h_name, SERVER_LEN - 1); |
68 |
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|
69 |
lefcha |
1.18 |
if (connect(*sock, (struct sockaddr *) & sa, sizeof(struct sockaddr))) { |
70 |
lefcha |
1.14 |
error("imapfilter: initiating connection to %s; %s\n", serv, |
71 |
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strerror(errno)); |
72 |
lefcha |
1.18 |
close_connection(sock); |
73 |
lefcha |
1.1 |
return ERROR_NETWORK; |
74 |
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} |
75 |
lefcha |
1.2 |
|
76 |
lefcha |
1.1 |
#ifdef SSL_TLS |
77 |
lefcha |
1.11 |
if (protocol != SSL_DISABLED) |
78 |
lefcha |
1.18 |
if (!ssl_init(sock, protocol)) { |
79 |
lefcha |
1.19 |
if (sock == &sockpri) |
80 |
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info("Connected to %s using %s.\n", serv, |
81 |
lefcha |
1.19.2.1 |
SSL_get_cipher(*ssl)); |
82 |
lefcha |
1.11 |
return 0; |
83 |
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} else |
84 |
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return ERROR_SSL; |
85 |
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else |
86 |
lefcha |
1.19.2.1 |
*ssl = NULL; |
87 |
lefcha |
1.1 |
#endif |
88 |
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|
89 |
lefcha |
1.19 |
if (sock == &sockpri) |
90 |
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info("Connected to %s.\n", serv); |
91 |
lefcha |
1.10 |
|
92 |
lefcha |
1.1 |
return 0; |
93 |
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} |
94 |
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95 |
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96 |
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#ifdef SSL_TLS |
97 |
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/* |
98 |
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* Initialize Secure Socket Layer connection. |
99 |
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*/ |
100 |
lefcha |
1.18 |
int ssl_init(int *sock, unsigned int protocol) |
101 |
lefcha |
1.1 |
{ |
102 |
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int e; |
103 |
lefcha |
1.7 |
unsigned int i, n = 0; |
104 |
lefcha |
1.1 |
SSL_CTX *ctx; |
105 |
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SSL_METHOD *method = NULL; |
106 |
lefcha |
1.3 |
X509 *cert; |
107 |
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char *c; |
108 |
lefcha |
1.19.2.4 |
const EVP_MD *evp; |
109 |
lefcha |
1.3 |
unsigned char digest[EVP_MAX_MD_SIZE]; |
110 |
lefcha |
1.19.2.1 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
111 |
lefcha |
1.2 |
|
112 |
lefcha |
1.1 |
SSL_library_init(); |
113 |
lefcha |
1.2 |
|
114 |
lefcha |
1.1 |
switch (protocol) { |
115 |
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case SSL_SSL_V2: |
116 |
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method = SSLv2_client_method(); |
117 |
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break; |
118 |
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case SSL_SSL_V3: |
119 |
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method = SSLv3_client_method(); |
120 |
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break; |
121 |
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case SSL_TLS_V1: |
122 |
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method = TLSv1_client_method(); |
123 |
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break; |
124 |
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} |
125 |
lefcha |
1.2 |
|
126 |
lefcha |
1.1 |
if (!(ctx = SSL_CTX_new(method))) |
127 |
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return ERROR_SSL; |
128 |
lefcha |
1.2 |
|
129 |
lefcha |
1.19.2.1 |
if (!(*ssl = SSL_new(ctx))) |
130 |
lefcha |
1.1 |
return ERROR_SSL; |
131 |
lefcha |
1.2 |
|
132 |
lefcha |
1.19.2.1 |
SSL_set_fd(*ssl, *sock); |
133 |
lefcha |
1.1 |
|
134 |
lefcha |
1.19.2.1 |
e = SSL_connect(*ssl); |
135 |
lefcha |
1.2 |
|
136 |
lefcha |
1.19.2.2 |
if (e <= 0) { |
137 |
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SSL_get_error(*ssl, e); |
138 |
lefcha |
1.1 |
error("imapfilter: initiating SSL connection; %s", |
139 |
lefcha |
1.19.2.2 |
ERR_error_string(ERR_get_error(), NULL)); |
140 |
lefcha |
1.1 |
return ERROR_SSL; |
141 |
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} |
142 |
lefcha |
1.3 |
/* Get server's certificate. */ |
143 |
lefcha |
1.19.2.1 |
if (!(cert = SSL_get_peer_certificate(*ssl))) |
144 |
lefcha |
1.3 |
return ERROR_SSL; |
145 |
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|
146 |
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if (!(c = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0))) |
147 |
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return ERROR_SSL; |
148 |
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verbose("Server certificate subject: %s\n", c); |
149 |
lefcha |
1.15 |
xfree(c); |
150 |
lefcha |
1.3 |
|
151 |
|
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if (!(c = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0))) |
152 |
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return ERROR_SSL; |
153 |
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verbose("Server certificate issuer: %s\n", c); |
154 |
lefcha |
1.15 |
xfree(c); |
155 |
lefcha |
1.3 |
|
156 |
|
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if (!(evp = EVP_md5())) |
157 |
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return ERROR_SSL; |
158 |
lefcha |
1.7 |
if (!(X509_digest(cert, evp, digest, &n))) |
159 |
lefcha |
1.3 |
return ERROR_SSL; |
160 |
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|
161 |
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verbose("Server key fingerprint: "); |
162 |
lefcha |
1.7 |
for (i = 0; i < n; i++) |
163 |
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verbose(i != n - 1 ? "%02X:" : "%02X\n", digest[i]); |
164 |
lefcha |
1.3 |
|
165 |
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X509_free(cert); |
166 |
lefcha |
1.1 |
SSL_CTX_free(ctx); |
167 |
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|
168 |
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return 0; |
169 |
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} |
170 |
lefcha |
1.19 |
|
171 |
lefcha |
1.1 |
#endif |
172 |
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173 |
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174 |
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/* |
175 |
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* Disconnect from mail server. |
176 |
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*/ |
177 |
lefcha |
1.18 |
int close_connection(int *sock) |
178 |
lefcha |
1.1 |
{ |
179 |
|
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#ifdef SSL_TLS |
180 |
lefcha |
1.19.2.1 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
181 |
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|
182 |
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if (*ssl) { |
183 |
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SSL_shutdown(*ssl); |
184 |
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SSL_free(*ssl); |
185 |
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*ssl = NULL; |
186 |
lefcha |
1.1 |
} |
187 |
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#endif |
188 |
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|
189 |
lefcha |
1.18 |
if (*sock >= 0 && close(*sock)) { |
190 |
lefcha |
1.1 |
error("imapfilter: closing socket; %s\n", strerror(errno)); |
191 |
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return ERROR_NETWORK; |
192 |
lefcha |
1.16 |
} else { |
193 |
lefcha |
1.18 |
*sock = -1; |
194 |
lefcha |
1.1 |
return 0; |
195 |
lefcha |
1.16 |
} |
196 |
lefcha |
1.1 |
} |
197 |
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|
198 |
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|
199 |
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/* |
200 |
|
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* Read data from socket. |
201 |
|
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*/ |
202 |
lefcha |
1.18 |
int socket_read(int *sock, char *buf) |
203 |
lefcha |
1.1 |
{ |
204 |
lefcha |
1.19.2.2 |
int f, e, s; |
205 |
lefcha |
1.1 |
fd_set fds; |
206 |
|
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struct timeval tv; |
207 |
lefcha |
1.13 |
struct timeval *tvp = NULL; |
208 |
lefcha |
1.19.2.1 |
#ifdef SSL_TLS |
209 |
|
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SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
210 |
|
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#endif |
211 |
lefcha |
1.7 |
|
212 |
lefcha |
1.19.2.2 |
e = 0; |
213 |
lefcha |
1.8 |
s = 1; |
214 |
lefcha |
1.1 |
|
215 |
lefcha |
1.19.2.6 |
memset(buf, 0, RESPONSE_BUF + 1); |
216 |
lefcha |
1.1 |
|
217 |
lefcha |
1.14 |
if (timeout >= 0) { |
218 |
lefcha |
1.13 |
tv.tv_sec = timeout; |
219 |
|
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tv.tv_usec = 0; |
220 |
|
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tvp = &tv; |
221 |
|
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} |
222 |
lefcha |
1.18 |
f = fcntl(*sock, F_GETFL, 0); |
223 |
|
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fcntl(*sock, F_SETFL, f | O_NONBLOCK); |
224 |
lefcha |
1.1 |
|
225 |
|
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FD_ZERO(&fds); |
226 |
lefcha |
1.18 |
FD_SET(*sock, &fds); |
227 |
lefcha |
1.1 |
|
228 |
|
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#ifdef SSL_TLS |
229 |
lefcha |
1.19.2.1 |
if (*ssl) { |
230 |
lefcha |
1.19.2.2 |
|
231 |
|
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for (;;) { |
232 |
lefcha |
1.19.2.4 |
if (SSL_pending(*ssl) || |
233 |
|
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((s = select(*sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
234 |
|
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FD_ISSET(*sock, &fds))) |
235 |
lefcha |
1.19.2.6 |
e = SSL_read(*ssl, buf, RESPONSE_BUF); |
236 |
lefcha |
1.19.2.2 |
|
237 |
|
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if (e > 0) |
238 |
|
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break; |
239 |
|
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|
240 |
|
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switch (SSL_get_error(*ssl, e)) { |
241 |
|
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case SSL_ERROR_WANT_READ: |
242 |
|
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case SSL_ERROR_WANT_WRITE: |
243 |
|
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continue; |
244 |
lefcha |
1.19.2.5 |
case SSL_ERROR_ZERO_RETURN: |
245 |
|
|
return ERROR_NETWORK; |
246 |
lefcha |
1.19.2.2 |
case SSL_ERROR_SYSCALL: |
247 |
|
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case SSL_ERROR_SSL: |
248 |
|
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fatal(ERROR_NETWORK, "imapfilter: reading data; %s", |
249 |
|
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ERR_error_string(ERR_get_error(), NULL)); |
250 |
|
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default: |
251 |
|
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fatal(ERROR_NETWORK, |
252 |
|
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"imapfilter: undefined ssl error while reading data\n"); |
253 |
|
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} |
254 |
|
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} |
255 |
lefcha |
1.6 |
} else |
256 |
lefcha |
1.19.2.3 |
#endif |
257 |
lefcha |
1.19.2.5 |
{ |
258 |
lefcha |
1.19.2.4 |
if ((s = select(*sock + 1, &fds, NULL, NULL, tvp)) > 0 && |
259 |
|
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FD_ISSET(*sock, &fds)) |
260 |
lefcha |
1.19.2.6 |
e = read(*sock, buf, RESPONSE_BUF); |
261 |
lefcha |
1.19.2.5 |
|
262 |
|
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if (e == -1) |
263 |
|
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fatal(ERROR_NETWORK, "imapfilter: reading data; %s", |
264 |
|
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strerror(errno)); |
265 |
|
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else if (e == 0) |
266 |
|
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return ERROR_NETWORK; |
267 |
|
|
} |
268 |
lefcha |
1.6 |
|
269 |
lefcha |
1.18 |
fcntl(*sock, F_SETFL, f); |
270 |
lefcha |
1.2 |
|
271 |
lefcha |
1.8 |
if (s == -1) |
272 |
lefcha |
1.19.2.2 |
fatal(ERROR_NETWORK, "imapfilter: waiting to read from socket; %s\n", |
273 |
lefcha |
1.6 |
strerror(errno)); |
274 |
lefcha |
1.8 |
else if (!s) |
275 |
|
|
fatal(ERROR_NETWORK, |
276 |
lefcha |
1.19.2.2 |
"imapfilter: timeout period expired while waiting to read " |
277 |
|
|
"data\n"); |
278 |
lefcha |
1.1 |
|
279 |
lefcha |
1.6 |
return 0; |
280 |
lefcha |
1.1 |
} |
281 |
|
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|
282 |
|
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|
283 |
|
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/* |
284 |
|
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* Write data to socket. |
285 |
|
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*/ |
286 |
lefcha |
1.18 |
int socket_write(int *sock, char *data) |
287 |
lefcha |
1.1 |
{ |
288 |
lefcha |
1.19.2.2 |
int f, e, s; |
289 |
|
|
fd_set fds; |
290 |
|
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struct timeval tv; |
291 |
|
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struct timeval *tvp = NULL; |
292 |
lefcha |
1.1 |
#ifdef SSL_TLS |
293 |
lefcha |
1.19.2.1 |
SSL **ssl = (sock == &sockpri ? &sslpri : &sslaux); |
294 |
lefcha |
1.19.2.2 |
#endif |
295 |
|
|
|
296 |
|
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e = 0; |
297 |
|
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s = 1; |
298 |
|
|
|
299 |
|
|
if (timeout >= 0) { |
300 |
|
|
tv.tv_sec = timeout; |
301 |
|
|
tv.tv_usec = 0; |
302 |
|
|
tvp = &tv; |
303 |
|
|
} |
304 |
|
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f = fcntl(*sock, F_GETFL, 0); |
305 |
|
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fcntl(*sock, F_SETFL, f | O_NONBLOCK); |
306 |
|
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|
307 |
|
|
FD_ZERO(&fds); |
308 |
|
|
FD_SET(*sock, &fds); |
309 |
lefcha |
1.1 |
|
310 |
lefcha |
1.19.2.2 |
#ifdef SSL_TLS |
311 |
lefcha |
1.19.2.1 |
if (*ssl) { |
312 |
lefcha |
1.19.2.2 |
for (;;) { |
313 |
lefcha |
1.19.2.4 |
if ((s = select(*sock + 1, NULL, &fds, NULL, tvp) > 0 && |
314 |
|
|
FD_ISSET(*sock, &fds))) |
315 |
lefcha |
1.19.2.2 |
e = SSL_write(*ssl, data, strlen(data)); |
316 |
|
|
|
317 |
|
|
if (e > 0) |
318 |
|
|
break; |
319 |
|
|
|
320 |
|
|
switch (SSL_get_error(*ssl, e)) { |
321 |
|
|
case SSL_ERROR_WANT_READ: |
322 |
|
|
case SSL_ERROR_WANT_WRITE: |
323 |
|
|
continue; |
324 |
lefcha |
1.19.2.5 |
case SSL_ERROR_ZERO_RETURN: |
325 |
|
|
return ERROR_NETWORK; |
326 |
lefcha |
1.19.2.2 |
case SSL_ERROR_SYSCALL: |
327 |
|
|
case SSL_ERROR_SSL: |
328 |
|
|
fatal(ERROR_NETWORK, "imapfilter: writing data; %s", |
329 |
|
|
ERR_error_string(ERR_get_error(), NULL)); |
330 |
|
|
default: |
331 |
|
|
fatal(ERROR_NETWORK, |
332 |
|
|
"imapfilter: undefined ssl error while writing data\n"); |
333 |
|
|
} |
334 |
|
|
} |
335 |
lefcha |
1.1 |
} else |
336 |
lefcha |
1.19.2.3 |
#endif |
337 |
lefcha |
1.19.2.5 |
{ |
338 |
lefcha |
1.19.2.4 |
if ((s = select(*sock + 1, NULL, &fds, NULL, tvp)) > 0 && |
339 |
|
|
FD_ISSET(*sock, &fds)) |
340 |
lefcha |
1.19.2.5 |
e = write(*sock, data, strlen(data)); |
341 |
|
|
|
342 |
|
|
if (e == -1) |
343 |
|
|
fatal(ERROR_NETWORK, "imapfilter: writing data; %s", |
344 |
|
|
strerror(errno)); |
345 |
|
|
} |
346 |
lefcha |
1.19.2.2 |
|
347 |
|
|
fcntl(*sock, F_SETFL, f); |
348 |
|
|
|
349 |
|
|
if (s == -1) |
350 |
|
|
fatal(ERROR_NETWORK, "imapfilter: waiting to write to socket; %s\n", |
351 |
lefcha |
1.1 |
strerror(errno)); |
352 |
lefcha |
1.19.2.2 |
else if (!s) |
353 |
|
|
fatal(ERROR_NETWORK, |
354 |
|
|
"imapfilter: timeout period expired while waiting to write " |
355 |
|
|
"data\n"); |
356 |
lefcha |
1.2 |
|
357 |
lefcha |
1.1 |
return 0; |
358 |
|
|
} |