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
|
/* Shared library add-on to iptables to add OWNER matching support. */
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <getopt.h>
#include <pwd.h>
#include <grp.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ipt_owner.h>
/* Function which prints out usage message. */
static void
help(void)
{
#ifdef IPT_OWNER_COMM
printf(
"OWNER match v%s options:\n"
"[!] --uid-owner userid Match local uid\n"
"[!] --gid-owner groupid Match local gid\n"
"[!] --pid-owner processid Match local pid\n"
"[!] --sid-owner sessionid Match local sid\n"
"[!] --cmd-owner name Match local command name\n"
"NOTE: pid, sid and command matching are broken on SMP\n"
"\n",
IPTABLES_VERSION);
#else
printf(
"OWNER match v%s options:\n"
"[!] --uid-owner userid Match local uid\n"
"[!] --gid-owner groupid Match local gid\n"
"[!] --pid-owner processid Match local pid\n"
"[!] --sid-owner sessionid Match local sid\n"
"NOTE: pid and sid matching are broken on SMP\n"
"\n",
IPTABLES_VERSION);
#endif /* IPT_OWNER_COMM */
}
static struct option opts[] = {
{ "uid-owner", 1, 0, '1' },
{ "gid-owner", 1, 0, '2' },
{ "pid-owner", 1, 0, '3' },
{ "sid-owner", 1, 0, '4' },
#ifdef IPT_OWNER_COMM
{ "cmd-owner", 1, 0, '5' },
#endif
{0}
};
/* Function which parses command options; returns true if it
ate an option */
static int
parse(int c, char **argv, int invert, unsigned int *flags,
const struct ipt_entry *entry,
unsigned int *nfcache,
struct xt_entry_match **match)
{
struct ipt_owner_info *ownerinfo = (struct ipt_owner_info *)(*match)->data;
switch (c) {
char *end;
struct passwd *pwd;
struct group *grp;
case '1':
check_inverse(optarg, &invert, &optind, 0);
if ((pwd = getpwnam(optarg)))
ownerinfo->uid = pwd->pw_uid;
else {
ownerinfo->uid = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad OWNER UID value `%s'", optarg);
}
if (invert)
ownerinfo->invert |= IPT_OWNER_UID;
ownerinfo->match |= IPT_OWNER_UID;
*flags = 1;
break;
case '2':
check_inverse(optarg, &invert, &optind, 0);
if ((grp = getgrnam(optarg)))
ownerinfo->gid = grp->gr_gid;
else {
ownerinfo->gid = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad OWNER GID value `%s'", optarg);
}
if (invert)
ownerinfo->invert |= IPT_OWNER_GID;
ownerinfo->match |= IPT_OWNER_GID;
*flags = 1;
break;
case '3':
check_inverse(optarg, &invert, &optind, 0);
ownerinfo->pid = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad OWNER PID value `%s'", optarg);
if (invert)
ownerinfo->invert |= IPT_OWNER_PID;
ownerinfo->match |= IPT_OWNER_PID;
*flags = 1;
break;
case '4':
check_inverse(optarg, &invert, &optind, 0);
ownerinfo->sid = strtoul(optarg, &end, 0);
if (*end != '\0' || end == optarg)
exit_error(PARAMETER_PROBLEM, "Bad OWNER SID value `%s'", optarg);
if (invert)
ownerinfo->invert |= IPT_OWNER_SID;
ownerinfo->match |= IPT_OWNER_SID;
*flags = 1;
break;
#ifdef IPT_OWNER_COMM
case '5':
check_inverse(optarg, &invert, &optind, 0);
if(strlen(optarg) > sizeof(ownerinfo->comm))
exit_error(PARAMETER_PROBLEM, "OWNER CMD `%s' too long, max %u characters", optarg, (unsigned int)sizeof(ownerinfo->comm));
strncpy(ownerinfo->comm, optarg, sizeof(ownerinfo->comm));
ownerinfo->comm[sizeof(ownerinfo->comm)-1] = '\0';
if (invert)
ownerinfo->invert |= IPT_OWNER_COMM;
ownerinfo->match |= IPT_OWNER_COMM;
*flags = 1;
break;
#endif
default:
return 0;
}
return 1;
}
static void
print_item(struct ipt_owner_info *info, u_int8_t flag, int numeric, char *label)
{
if(info->match & flag) {
if (info->invert & flag)
printf("! ");
printf(label);
switch(info->match & flag) {
case IPT_OWNER_UID:
if(!numeric) {
struct passwd *pwd = getpwuid(info->uid);
if(pwd && pwd->pw_name) {
printf("%s ", pwd->pw_name);
break;
}
/* FALLTHROUGH */
}
printf("%u ", info->uid);
break;
case IPT_OWNER_GID:
if(!numeric) {
struct group *grp = getgrgid(info->gid);
if(grp && grp->gr_name) {
printf("%s ", grp->gr_name);
break;
}
/* FALLTHROUGH */
}
printf("%u ", info->gid);
break;
case IPT_OWNER_PID:
printf("%u ", info->pid);
break;
case IPT_OWNER_SID:
printf("%u ", info->sid);
break;
#ifdef IPT_OWNER_COMM
case IPT_OWNER_COMM:
printf("%.*s ", (int)sizeof(info->comm), info->comm);
break;
#endif
default:
break;
}
}
}
/* Final check; must have specified --own. */
static void
final_check(unsigned int flags)
{
if (!flags)
exit_error(PARAMETER_PROBLEM,
"OWNER match: You must specify one or more options");
}
/* Prints out the matchinfo. */
static void
print(const struct ipt_ip *ip,
const struct xt_entry_match *match,
int numeric)
{
struct ipt_owner_info *info = (struct ipt_owner_info *)match->data;
print_item(info, IPT_OWNER_UID, numeric, "OWNER UID match ");
print_item(info, IPT_OWNER_GID, numeric, "OWNER GID match ");
print_item(info, IPT_OWNER_PID, numeric, "OWNER PID match ");
print_item(info, IPT_OWNER_SID, numeric, "OWNER SID match ");
#ifdef IPT_OWNER_COMM
print_item(info, IPT_OWNER_COMM, numeric, "OWNER CMD match ");
#endif
}
/* Saves the union ipt_matchinfo in parsable form to stdout. */
static void
save(const struct ipt_ip *ip, const struct xt_entry_match *match)
{
struct ipt_owner_info *info = (struct ipt_owner_info *)match->data;
print_item(info, IPT_OWNER_UID, 0, "--uid-owner ");
print_item(info, IPT_OWNER_GID, 0, "--gid-owner ");
print_item(info, IPT_OWNER_PID, 0, "--pid-owner ");
print_item(info, IPT_OWNER_SID, 0, "--sid-owner ");
#ifdef IPT_OWNER_COMM
print_item(info, IPT_OWNER_COMM, 0, "--cmd-owner ");
#endif
}
static struct iptables_match owner = {
.next = NULL,
.name = "owner",
.version = IPTABLES_VERSION,
.size = IPT_ALIGN(sizeof(struct ipt_owner_info)),
.userspacesize = IPT_ALIGN(sizeof(struct ipt_owner_info)),
.help = &help,
.parse = &parse,
.final_check = &final_check,
.print = &print,
.save = &save,
.extra_opts = opts
};
void _init(void)
{
register_match(&owner);
}
|
