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
|
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <sys/types.h>
#include <grp.h>
#include <dirent.h>
#ifdef FreeBSD
#include <sys/syslimits.h>
#define SU "/usr/bin/su"
#define CP "/bin/cp"
#define KILLALL "/usr/bin/killall"
#endif
#ifdef Linux
#include <linux/limits.h>
#define SU "/bin/su"
#define CP "/bin/cp"
#define KILLALL "/usr/bin/killall"
#endif
void usage(void)
{
printf("usage: bbsctl [start|stop|restart|bbsadm|test]\n"
" bbsctl start start mbbsd at 23,3000-3010\n"
" bbsctl stop killall listening mbbsd\n"
" bbsctl restart stop + start\n"
" bbsctl bbsadm su to bbsadm\n"
" bbsctl test use bbsadm permission to exec ./mbbsd 9000\n");
exit(0);
}
int HaveBBSADM(void)
{
gid_t gids[NGROUPS_MAX];
int i, ngids;
struct group *gr;
ngids = getgroups(NGROUPS_MAX, gids);
if( (gr = getgrnam("bbsadm")) == NULL ){
puts("group bbsadm not found");
return 0;
}
for( i = 0 ; i < ngids ; ++i )
if( gr->gr_gid == gids[i] )
break;
if( i == ngids ){
puts("permission denied");
return 0;
}
return 1;
}
void startbbs(void)
{
if( setuid(0) < 0 ){
perror("setuid(0)");
exit(1);
}
puts("starting mbbsd: 23"); system("/home/bbs/bin/mbbsd 23");
puts("starting mbbsd:3000"); system("/home/bbs/bin/mbbsd 3000");
puts("starting mbbsd:3001"); system("/home/bbs/bin/mbbsd 3001");
puts("starting mbbsd:3002"); system("/home/bbs/bin/mbbsd 3002");
puts("starting mbbsd:3003"); system("/home/bbs/bin/mbbsd 3003");
puts("starting mbbsd:3004"); system("/home/bbs/bin/mbbsd 3004");
puts("starting mbbsd:3005"); system("/home/bbs/bin/mbbsd 3005");
puts("starting mbbsd:3006"); system("/home/bbs/bin/mbbsd 3006");
puts("starting mbbsd:3007"); system("/home/bbs/bin/mbbsd 3007");
puts("starting mbbsd:3008"); system("/home/bbs/bin/mbbsd 3008");
puts("starting mbbsd:3009"); system("/home/bbs/bin/mbbsd 3009");
puts("starting mbbsd:3010"); system("/home/bbs/bin/mbbsd 3010");
}
void stopbbs(void)
{
DIR *dirp;
struct dirent *de;
FILE *fp;
char buf[512];
if( !(dirp = opendir("/proc")) ){
perror("open /proc");
exit(0);
}
while( (de = readdir(dirp)) ){
if( de->d_type & DT_DIR ){
sprintf(buf, "/proc/%s/cmdline", de->d_name);
if( (fp = fopen(buf, "r")) ){
if( fgets(buf, sizeof(buf), fp) != NULL ){
if( strstr(buf, "mbbsd") && strstr(buf, "listening") ){
kill(atoi(de->d_name), 1);
printf("stopping mbbsd at pid %5d\n", atoi(de->d_name));
}
}
fclose(fp);
}
}
}
closedir(dirp);
}
void restartbbs(void)
{
stopbbs();
sleep(1);
startbbs();
}
void bbsadm(void)
{
if( setuid(0) < 0 ){
perror("setuid(0)");
return;
}
puts("permission granted");
execl(SU, "su", "bbsadm", NULL);
}
void bbstest(void)
{
if( access("mbbsd", 0) < 0 ){
perror("./mbbsd");
return;
}
system(CP " -f mbbsd testmbbsd");
if( setuid(0) < 0 ){
perror("setuid(0)");
return;
}
if( setuid(9999) < 0 ){
perror("setuid(9999)");
return;
}
system(KILLALL " testmbbsd");
execl("./testmbbsd", "testmbbsd", "9000", NULL);
perror("execl()");
}
struct {
char *cmd;
void (*func)();
}cmds[] = { {"start", startbbs},
{"stop", stopbbs},
{"restart", restartbbs},
{"bbsadm", bbsadm},
{"test", bbstest},
{NULL, NULL} };
int main(int argc, char **argv)
{
int i;
if( argc == 1 )
usage();
if( !HaveBBSADM() )
return 1;
for( i = 0 ; cmds[i].cmd != NULL ; ++i )
if( strcmp(cmds[i].cmd, argv[1]) == 0 ){
cmds[i].func();
break;
}
if( cmds[i].cmd == NULL ){
printf("command %s not found\n", argv[1]);
usage();
}
return 0;
}
|