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
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
|
/*
* Copyright (c) 2000 - 2004 Kungliga Tekniska Högskolan
* (Royal Institute of Technology, Stockholm, Sweden).
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* 3. Neither the name of the Institute nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "kadmin_locl.h"
#ifdef HAVE_SYS_WAIT_H
#include <sys/wait.h>
#endif
extern int daemon_child;
struct kadm_port {
char *port;
unsigned short def_port;
struct kadm_port *next;
} *kadm_ports;
static void
add_kadm_port(krb5_context contextp, const char *service, unsigned int port)
{
struct kadm_port *p;
p = malloc(sizeof(*p));
if(p == NULL) {
krb5_warnx(contextp, "failed to allocate %lu bytes\n",
(unsigned long)sizeof(*p));
return;
}
p->port = strdup(service);
p->def_port = port;
p->next = kadm_ports;
kadm_ports = p;
}
static void
add_standard_ports (krb5_context contextp)
{
add_kadm_port(contextp, "kerberos-adm", 749);
}
/*
* parse the set of space-delimited ports in `str' and add them.
* "+" => all the standard ones
* otherwise it's port|service[/protocol]
*/
void
parse_ports(krb5_context contextp, const char *str)
{
char p[128];
while(strsep_copy(&str, " \t", p, sizeof(p)) != -1) {
if(strcmp(p, "+") == 0)
add_standard_ports(contextp);
else
add_kadm_port(contextp, p, 0);
}
}
static pid_t pgrp;
sig_atomic_t term_flag, doing_useful_work;
static RETSIGTYPE
sigchld(int sig)
{
int status;
/*
* waitpid() is async safe. will return -1 or 0 on no more zombie
* children
*/
while ((waitpid(-1, &status, WNOHANG)) > 0)
;
SIGRETURN(0);
}
static RETSIGTYPE
terminate(int sig)
{
if(getpid() == pgrp) {
/* parent */
term_flag = 1;
signal(sig, SIG_IGN);
killpg(pgrp, sig);
} else {
/* child */
if(doing_useful_work)
term_flag = 1;
else
exit(0);
}
SIGRETURN(0);
}
static int
spawn_child(krb5_context contextp, int *socks,
unsigned int num_socks, int this_sock)
{
int e;
size_t i;
struct sockaddr_storage __ss;
struct sockaddr *sa = (struct sockaddr *)&__ss;
socklen_t sa_size = sizeof(__ss);
krb5_socket_t s;
pid_t pid;
krb5_address addr;
char buf[128];
size_t buf_len;
s = accept(socks[this_sock], sa, &sa_size);
if(rk_IS_BAD_SOCKET(s)) {
krb5_warn(contextp, rk_SOCK_ERRNO, "accept");
return 1;
}
e = krb5_sockaddr2address(contextp, sa, &addr);
if(e)
krb5_warn(contextp, e, "krb5_sockaddr2address");
else {
e = krb5_print_address (&addr, buf, sizeof(buf),
&buf_len);
if(e)
krb5_warn(contextp, e, "krb5_print_address");
else
krb5_warnx(contextp, "connection from %s", buf);
krb5_free_address(contextp, &addr);
}
pid = fork();
if(pid == 0) {
for(i = 0; i < num_socks; i++)
rk_closesocket(socks[i]);
dup2(s, STDIN_FILENO);
dup2(s, STDOUT_FILENO);
if(s != STDIN_FILENO && s != STDOUT_FILENO)
rk_closesocket(s);
return 0;
} else {
rk_closesocket(s);
}
return 1;
}
static void
wait_for_connection(krb5_context contextp,
krb5_socket_t *socks, unsigned int num_socks)
{
unsigned int i;
int e;
fd_set orig_read_set, read_set;
int status, max_fd = -1;
FD_ZERO(&orig_read_set);
for(i = 0; i < num_socks; i++) {
#ifdef FD_SETSIZE
if (socks[i] >= FD_SETSIZE)
errx (1, "fd too large");
#endif
FD_SET(socks[i], &orig_read_set);
max_fd = max(max_fd, socks[i]);
}
pgrp = getpid();
/* systemd may cause setpgid to fail with EPERM */
if(setpgid(0, pgrp) < 0 && errno != EPERM)
err(1, "setpgid");
signal(SIGTERM, terminate);
signal(SIGINT, terminate);
signal(SIGCHLD, sigchld);
while (term_flag == 0) {
read_set = orig_read_set;
e = select(max_fd + 1, &read_set, NULL, NULL, NULL);
if(rk_IS_SOCKET_ERROR(e)) {
if(rk_SOCK_ERRNO != EINTR)
krb5_warn(contextp, rk_SOCK_ERRNO, "select");
} else if(e == 0)
krb5_warnx(contextp, "select returned 0");
else {
for(i = 0; i < num_socks; i++) {
if(FD_ISSET(socks[i], &read_set))
if(spawn_child(contextp, socks, num_socks, i) == 0)
return;
}
}
}
signal(SIGCHLD, SIG_IGN);
while ((waitpid(-1, &status, WNOHANG)) > 0)
;
exit(0);
}
void
start_server(krb5_context contextp, const char *port_str)
{
int e;
struct kadm_port *p;
krb5_socket_t *socks = NULL, *tmp;
unsigned int num_socks = 0;
int i;
if (port_str == NULL)
port_str = "+";
parse_ports(contextp, port_str);
for(p = kadm_ports; p; p = p->next) {
struct addrinfo hints, *ai, *ap;
char portstr[32];
memset (&hints, 0, sizeof(hints));
hints.ai_flags = AI_PASSIVE;
hints.ai_socktype = SOCK_STREAM;
e = getaddrinfo(NULL, p->port, &hints, &ai);
if(e) {
snprintf(portstr, sizeof(portstr), "%u", p->def_port);
e = getaddrinfo(NULL, portstr, &hints, &ai);
}
if(e) {
krb5_warn(contextp, krb5_eai_to_heim_errno(e, errno),
"%s", portstr);
continue;
}
i = 0;
for(ap = ai; ap; ap = ap->ai_next)
i++;
tmp = realloc(socks, (num_socks + i) * sizeof(*socks));
if(tmp == NULL)
krb5_err(contextp, 1, errno, "failed to reallocate %lu bytes",
(unsigned long)(num_socks + i) * sizeof(*socks));
socks = tmp;
for(ap = ai; ap; ap = ap->ai_next) {
krb5_socket_t s = socket(ap->ai_family, ap->ai_socktype, ap->ai_protocol);
if(rk_IS_BAD_SOCKET(s)) {
krb5_warn(contextp, rk_SOCK_ERRNO, "socket");
continue;
}
socket_set_reuseaddr(s, 1);
socket_set_ipv6only(s, 1);
if (rk_IS_SOCKET_ERROR(bind (s, ap->ai_addr, ap->ai_addrlen))) {
krb5_warn(contextp, rk_SOCK_ERRNO, "bind");
rk_closesocket(s);
continue;
}
if (rk_IS_SOCKET_ERROR(listen (s, SOMAXCONN))) {
krb5_warn(contextp, rk_SOCK_ERRNO, "listen");
rk_closesocket(s);
continue;
}
socket_set_keepalive(s, 1);
socks[num_socks++] = s;
}
freeaddrinfo (ai);
}
if(num_socks == 0)
krb5_errx(contextp, 1, "no sockets to listen to - exiting");
roken_detach_finish(NULL, daemon_child);
wait_for_connection(contextp, socks, num_socks);
free(socks);
}
|
