/[imapfilter]/imapfilter/socket.c
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Annotation of /imapfilter/socket.c

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Revision 1.3 - (hide annotations)
Thu Nov 1 16:38:23 2001 UTC (22 years, 5 months ago) by lefcha
Branch: MAIN
Changes since 1.2: +30 -0 lines
File MIME type: text/plain
Server certificate and key finger print.

1 lefcha 1.1 #include <string.h>
2     #include <errno.h>
3     #include <unistd.h>
4     #include <sys/types.h>
5     #include <sys/socket.h>
6     #include <netinet/in.h>
7     #include <netdb.h>
8     #include <fcntl.h>
9    
10     #include "config.h"
11     #include "imapfilter.h"
12    
13     #ifdef SSL_TLS
14     #include <openssl/ssl.h>
15     #include <openssl/err.h>
16 lefcha 1.3 #include <openssl/x509.h>
17 lefcha 1.1
18    
19     static SSL *ssl;
20     #endif
21    
22     static int sock;
23    
24    
25     /*
26     * Connect to mail server.
27     */
28     #ifndef SSL_TLS
29     int init_connection(char *serv, unsigned int port)
30     #else
31     int init_connection(char *serv, unsigned int port, unsigned int protocol)
32     #endif
33     {
34     struct sockaddr_in sa;
35     struct hostent *he;
36    
37     memset((char *) &sa, 0, sizeof(struct sockaddr_in));
38    
39     sock = socket(PF_INET, SOCK_STREAM, 0);
40    
41     if (sock < 0) {
42     error("imapfilter: create socket; %s\n", strerror(errno));
43     return ERROR_NETWORK;
44     }
45     if (!(he = gethostbyname(serv))) {
46     error("imapfilter: get network host entry; %s\n", strerror(errno));
47     close_connection();
48     return ERROR_NETWORK;
49     }
50     sa.sin_family = AF_INET;
51     sa.sin_port = htons(port);
52     sa.sin_addr = *(struct in_addr *) he->h_addr;
53    
54     if (connect(sock, (struct sockaddr *) & sa, sizeof(struct sockaddr))) {
55     error("imapfilter: initiating connection; %s\n", strerror(errno));
56     close_connection();
57     return ERROR_NETWORK;
58     }
59     strncpy(serv, he->h_name, SERVER_LEN - 1);
60    
61     log_info(LOG_SERVER, serv);
62 lefcha 1.2
63 lefcha 1.1 #ifdef SSL_TLS
64     if (protocol != SSL_DISABLED) {
65     ssl_init(protocol);
66     info("Connected to %s using %s.\n", serv, SSL_get_cipher(ssl));
67     } else {
68     ssl = NULL;
69     #endif
70     info("Connected to %s.\n", serv);
71     #ifdef SSL_TLS
72     }
73     #endif
74 lefcha 1.2
75 lefcha 1.1
76     return 0;
77     }
78    
79    
80     #ifdef SSL_TLS
81     /*
82     * Initialize Secure Socket Layer connection.
83     */
84     int ssl_init(unsigned int protocol)
85     {
86     int e;
87     SSL_CTX *ctx;
88     SSL_METHOD *method = NULL;
89 lefcha 1.3 X509 *cert;
90     char *c;
91     EVP_MD *evp;
92     unsigned char digest[EVP_MAX_MD_SIZE];
93     int s, i;
94 lefcha 1.2
95 lefcha 1.1 SSL_library_init();
96 lefcha 1.2
97 lefcha 1.1 switch (protocol) {
98     case SSL_SSL_V2:
99     method = SSLv2_client_method();
100     break;
101     case SSL_SSL_V3:
102     method = SSLv3_client_method();
103     break;
104     case SSL_TLS_V1:
105     method = TLSv1_client_method();
106     break;
107     }
108 lefcha 1.2
109 lefcha 1.1 if (!(ctx = SSL_CTX_new(method)))
110     return ERROR_SSL;
111 lefcha 1.2
112 lefcha 1.1 if (!(ssl = SSL_new(ctx)))
113     return ERROR_SSL;
114 lefcha 1.2
115 lefcha 1.1 SSL_set_fd(ssl, sock);
116    
117     e = SSL_connect(ssl);
118 lefcha 1.2
119 lefcha 1.1 if (e <= 0) {
120     error("imapfilter: initiating SSL connection; %s",
121     ERR_error_string(e, NULL));
122     return ERROR_SSL;
123     }
124 lefcha 1.3 /* Get server's certificate. */
125     if (!(cert = SSL_get_peer_certificate(ssl)))
126     return ERROR_SSL;
127    
128     if (!(c = X509_NAME_oneline(X509_get_subject_name(cert), 0, 0)))
129     return ERROR_SSL;
130     verbose("Server certificate subject: %s\n", c);
131     free(c);
132    
133     if (!(c = X509_NAME_oneline(X509_get_issuer_name(cert), 0, 0)))
134     return ERROR_SSL;
135     verbose("Server certificate issuer: %s\n", c);
136     free(c);
137    
138     if (!(evp = EVP_md5()))
139     return ERROR_SSL;
140     if (!(X509_digest(cert, evp, digest, &s)))
141     return ERROR_SSL;
142    
143     verbose("Server key fingerprint: ");
144     for (i = 0; i < s; i++)
145     verbose(i != s - 1 ? "%02X:" : "%02X\n", digest[i]);
146    
147     X509_free(cert);
148 lefcha 1.1 SSL_CTX_free(ctx);
149    
150     return 0;
151     }
152     #endif
153    
154    
155     /*
156     * Disconnect from mail server.
157     */
158     int close_connection(void)
159     {
160     #ifdef SSL_TLS
161     if (ssl) {
162     SSL_shutdown(ssl);
163     SSL_free(ssl);
164     }
165     #endif
166    
167     if (close(sock)) {
168     error("imapfilter: closing socket; %s\n", strerror(errno));
169     return ERROR_NETWORK;
170     } else
171     return 0;
172     }
173    
174    
175     /*
176     * Read data from socket.
177     */
178     int socket_read(char *buf)
179     {
180     int flags, e;
181     fd_set fds;
182     struct timeval tv;
183    
184     memset(buf, 0, RESPONSE_BUF);
185    
186     tv.tv_sec = 20;
187     tv.tv_usec = 0;
188    
189     flags = fcntl(sock, F_GETFL, 0);
190     fcntl(sock, F_SETFL, flags | O_NONBLOCK);
191    
192     FD_ZERO(&fds);
193     FD_SET(sock, &fds);
194    
195     if ((select(sock + 1, &fds, NULL, NULL, &tv) > 0)
196     && FD_ISSET(sock, &fds)) {
197    
198     #ifdef SSL_TLS
199     if (ssl)
200     e = SSL_read(ssl, buf, RESPONSE_BUF - 1);
201     else
202     #endif
203     e = read(sock, buf, RESPONSE_BUF - 1);
204 lefcha 1.2
205 lefcha 1.1 fcntl(sock, F_SETFL, flags);
206    
207     #ifdef SSL_TLS
208     if (ssl) {
209     if (e <= 0)
210     fatal(ERROR_NETWORK, "imapfilter: reading data; %s",
211     ERR_error_string(e, NULL));
212     } else
213     #endif
214 lefcha 1.2 if (e == -1)
215     fatal(ERROR_NETWORK, "imapfilter: reading data; %s",
216     strerror(errno));
217    
218 lefcha 1.1 return 0;
219     }
220     fcntl(sock, F_SETFL, flags);
221    
222     fatal(ERROR_NETWORK, "imapfilter: waiting input from socket; %s\n",
223     strerror(errno));
224    
225     return ERROR_NETWORK; /* NEVER REACHED. */
226     }
227    
228    
229     /*
230     * Write data to socket.
231     */
232     int socket_write(char *data)
233     {
234     #ifdef SSL_TLS
235     int e;
236    
237     if (ssl) {
238     e = SSL_write(ssl, data, strlen(data));
239     if (e <= 0)
240     fatal(ERROR_NETWORK,
241     "imapfilter: sending data; %s",
242     ERR_error_string(e, NULL));
243     } else
244     #endif
245     if (write(sock, data, strlen(data)) == -1)
246     fatal(ERROR_NETWORK, "imapfilter: sending data; %s",
247     strerror(errno));
248 lefcha 1.2
249 lefcha 1.1 return 0;
250     }

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