1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
|
/*
* kdc/network.c
*
* Copyright 1990 by the Massachusetts Institute of Technology.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
*
* Network code for Kerberos v5 KDC.
*/
#include "k5-int.h"
#include "com_err.h"
#include "kdc_util.h"
#include "extern.h"
#include "kdc5_err.h"
#ifdef KRB5_USE_INET
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/time.h>
#if defined(_AIX) || defined(AIXArchitecture)
#include <sys/select.h>
#endif
#include <arpa/inet.h>
#include <netdb.h>
extern int errno;
extern short primary_port;
static int udp_port_fd = -1;
static int sec_udp_port_fd = -1;
static fd_set select_fds;
static int select_nfsd;
krb5_error_code
setup_network(prog)
const char *prog;
{
struct servent *sp;
struct sockaddr_in sin;
krb5_error_code retval;
FD_ZERO(&select_fds);
select_nfsd = 0;
memset((char *)&sin, 0, sizeof(sin));
if (primary_port) {
sin.sin_port = htons(primary_port);
} else {
sp = getservbyname(KDC_PORTNAME, "udp");
if (!sp)
sin.sin_port = htons(KRB5_DEFAULT_PORT);
else
sin.sin_port = sp->s_port;
}
if ((udp_port_fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
retval = errno;
com_err(prog, 0, "Cannot create server socket");
return retval;
}
if (bind(udp_port_fd, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
retval = errno;
com_err(prog, 0, "Cannot bind server socket to fd %d", udp_port_fd);
return retval;
}
FD_SET(udp_port_fd, &select_fds);
if (udp_port_fd+1 > select_nfsd)
select_nfsd = udp_port_fd+1;
/*
* Now we set up the secondary listening port
*/
sp = getservbyname(KDC_SECONDARY_PORTNAME, "udp");
if (!sp && sin.sin_port == htons(KRB5_DEFAULT_SEC_PORT)) {
com_err(prog, 0, "%s/udp service unknown\n",
KDC_SECONDARY_PORTNAME);
return 0; /* Don't give an error if we can't */
/* find it */
}
if ((sec_udp_port_fd = socket(PF_INET, SOCK_DGRAM, 0)) == -1) {
com_err(prog, errno, "while trying to create secondary server socket");
return 0; /* Don't give an error we we can't do this */
}
memset((char *)&sin, 0, sizeof(sin));
sin.sin_port = sp ? sp->s_port : htons(KRB5_DEFAULT_SEC_PORT);
if (bind(sec_udp_port_fd, (struct sockaddr *)&sin, sizeof(sin)) == -1) {
com_err(prog, errno, "while trying to bind secondary server socket");
return 0; /* Don't give an error if we can't do this */
}
FD_SET(sec_udp_port_fd, &select_fds);
if (sec_udp_port_fd+1 > select_nfsd)
select_nfsd = sec_udp_port_fd+1;
return 0;
}
void process_packet(port_fd, prog, is_secondary)
int port_fd;
char *prog;
int is_secondary;
{
int cc, saddr_len;
krb5_fulladdr faddr;
krb5_error_code retval;
struct sockaddr_in saddr;
krb5_address addr;
krb5_data request;
krb5_data *response;
char pktbuf[MAX_DGRAM_SIZE];
if (port_fd < 0)
return;
saddr_len = sizeof(saddr);
cc = recvfrom(port_fd, pktbuf, sizeof(pktbuf), 0,
(struct sockaddr *)&saddr, &saddr_len);
if (cc == -1) {
if (errno != EINTR)
com_err(prog, errno, "while receiving from network");
return;
}
if (!cc)
return; /* zero-length packet? */
request.length = cc;
request.data = pktbuf;
faddr.port = ntohs(saddr.sin_port);
faddr.address = &addr;
addr.addrtype = ADDRTYPE_INET;
addr.length = 4;
/* this address is in net order */
addr.contents = (krb5_octet *) &saddr.sin_addr;
if ((retval = dispatch(&request, &faddr, is_secondary, &response))) {
com_err(prog, retval, "while dispatching");
return;
}
cc = sendto(port_fd, response->data, response->length, 0,
(struct sockaddr *)&saddr, saddr_len);
if (cc == -1) {
krb5_free_data(kdc_context, response);
com_err(prog, errno, "while sending reply to %s/%d",
inet_ntoa(saddr.sin_addr), ntohs(saddr.sin_port));
return;
}
if (cc != response->length) {
krb5_free_data(kdc_context, response);
com_err(prog, 0, "short reply write %d vs %d\n",
response->length, cc);
return;
}
krb5_free_data(kdc_context, response);
return;
}
krb5_error_code
listen_and_process(prog)
const char *prog;
{
int nfound;
fd_set readfds;
if (udp_port_fd == -1)
return KDC5_NONET;
while (!signal_requests_exit) {
readfds = select_fds;
nfound = select(select_nfsd, &readfds, 0, 0, 0);
if (nfound == -1) {
if (errno == EINTR)
continue;
com_err(prog, errno, "while selecting for network input");
continue;
}
if (FD_ISSET(udp_port_fd, &readfds))
process_packet(udp_port_fd, prog, 0);
if ((sec_udp_port_fd > 0) && FD_ISSET(sec_udp_port_fd, &readfds))
process_packet(sec_udp_port_fd, prog, 1);
}
return 0;
}
krb5_error_code
closedown_network(prog)
const char *prog;
{
if (udp_port_fd == -1)
return KDC5_NONET;
(void) close(udp_port_fd);
udp_port_fd = -1;
if (sec_udp_port_fd != -1)
(void) close(sec_udp_port_fd);
sec_udp_port_fd = -1;
return 0;
}
#endif /* INET */
|
