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
|
/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 1999-2009. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
/*
* setuid_socket_wrap.c
*
* ./a.out [-s [tag,][addr]:[port]]* [-d [tag,][addr]:[port]]*
* [-r [tag,]proto]* [-p erl_path]* -- program args
*
* Where: -s = stream socket, -d datagram socket and -r means raw socket.
*
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#ifndef INADDR_NONE
#define INADDR_NONE 0xffffffff
#endif
struct sock_list {
struct sock_list *next;
int fd;
int type;
int protocol;
struct sockaddr_in addr;
char *arg;
};
int parse_addr(addr, str)
struct sockaddr_in *addr;
char *str;
{
int port = 0;
char *cp;
struct hostent *hp;
struct servent *se;
if ((cp = strrchr(str, (int)':')) != NULL)
*cp++ = '\0';
if (cp) {
if (!isdigit((int)cp[0])) {
if ((se = getservbyname(cp, "tcp")) != NULL) {
port = ntohs(se->s_port);
} else {
fprintf(stderr, "unknown port %s\n", cp);
return -1;
}
} else {
port = atoi(cp);
}
}
if (port < 0 || port > 0xffff) {
fprintf(stderr, "bad port number %d\n", port);
return -1;
}
bzero(addr, sizeof(*addr));
addr->sin_family = AF_INET;
addr->sin_port = htons(port);
if (*str == '\000') {
addr->sin_addr.s_addr = INADDR_ANY;
} else {
if ((addr->sin_addr.s_addr = inet_addr(str)) == INADDR_NONE) {
if ((hp = gethostbyname(str)) == NULL) {
fprintf(stderr, "\"%s\" unknown host or address!\n", str);
return -1;
} else {
bcopy(hp->h_addr_list[0], &addr->sin_addr.s_addr,hp->h_length);
}
}
}
return 0;
}
struct sock_list *new_entry(type, argstr)
int type;
char *argstr;
{
struct sock_list *sle;
char *cp;
sle = (struct sock_list *)malloc(sizeof(struct sock_list));
if (!sle)
return NULL;
sle->next = NULL;
sle->fd = -1;
if ((cp = strchr(argstr, (int)',')) != NULL) {
*cp++ = '\0';
sle->arg = argstr;
argstr = cp;
} else {
sle->arg = "-fd";
}
sle->type = type;
switch (type) {
case SOCK_RAW: {
struct protoent *pe;
pe = getprotobyname(argstr);
if (!pe) {
fprintf(stderr, "Unknown protocol: %s\n", argstr);
free(sle);
return NULL;
}
sle->protocol = pe->p_proto;
break;
}
case SOCK_STREAM:
case SOCK_DGRAM:
sle->protocol = 0;
if (parse_addr(&sle->addr, argstr) < 0) {
free(sle);
return NULL;
}
break;
}
return sle;
}
int open_socket(sle)
struct sock_list *sle;
{
sle->fd = socket(AF_INET, sle->type, sle->protocol);
if (sle->fd < 0) {
perror("socket");
return -1;
}
if (sle->type != SOCK_RAW) {
#if 0
printf("binding fd %d to %s:%d\n", sle->fd,
inet_ntoa(sle->addr.sin_addr), ntohs(sle->addr.sin_port));
#endif
if (bind(sle->fd, (struct sockaddr *)&sle->addr, sizeof(sle->addr))<0){
perror("bind");
close(sle->fd);
return -1;
}
}
return sle->fd;
}
int main(argc, argv)
int argc;
char *argv[];
{
struct sock_list *sl = NULL, *sltmp = NULL;
int count = 0;
int c;
char *run_prog = NULL;
while ((c = getopt(argc, argv, "s:d:r:p:")) != EOF)
switch (c) {
case 's':
sltmp = new_entry(SOCK_STREAM, optarg);
if (!sltmp) {
exit(1);
}
sltmp->next = sl;
sl = sltmp;
count++;
break;
case 'd':
sltmp = new_entry(SOCK_DGRAM, optarg);
if (!sltmp) {
exit(1);
}
sltmp->next = sl;
sl = sltmp;
count++;
break;
case 'r':
sltmp = new_entry(SOCK_RAW, optarg);
if (!sltmp) {
exit(1);
}
sltmp->next = sl;
sl = sltmp;
count++;
break;
case 'p':
run_prog = optarg;
break;
default:
exit(1);
}
argc -= optind;
argv += optind;
for(sltmp = sl; sltmp != NULL; sltmp = sltmp->next)
if (open_socket(sltmp) < 0) {
fprintf(stderr, "failed to create socket!\n");
exit(1);
}
setuid(getuid());
{
int i;
char **newargv;
char *run_prog_name;
newargv = (char **)malloc((1 + 2*count + argc + 1) * sizeof(char*));
if ((run_prog_name = strrchr(run_prog, (int)'/')) == NULL)
run_prog_name = run_prog;
else
run_prog_name++;
i = 0;
newargv[i++] = run_prog_name;
for (; argc; argc--, argv++, i++)
newargv[i] = *argv;
for(sltmp = sl; sltmp != NULL; ) {
char *fd_str = (char *)malloc(8);
if (!fd_str) exit(1);
sprintf(fd_str, "%d", sltmp->fd);
if (sltmp->arg && *(sltmp->arg))
newargv[i++] = sltmp->arg;
newargv[i++] = fd_str;
sl = sltmp;
sltmp = sltmp->next;
free(sl);
}
newargv[i] = (char *)NULL;
execv(run_prog, newargv);
perror("exec");
exit(1);
}
exit(0);
}
|
