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1 | /** |
2 | * Seccomp Library test program | |
3 | * | |
4 | * Copyright (c) 2012 Red Hat <pmoore@redhat.com> | |
5 | * Author: Paul Moore <paul@paul-moore.com> | |
6 | */ | |
7 | ||
8 | /* | |
9 | * This library is free software; you can redistribute it and/or modify it | |
10 | * under the terms of version 2.1 of the GNU Lesser General Public License as | |
11 | * published by the Free Software Foundation. | |
12 | * | |
13 | * This library is distributed in the hope that it will be useful, but WITHOUT | |
14 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
15 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License | |
16 | * for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU Lesser General Public License | |
19 | * along with this library; if not, see <http://www.gnu.org/licenses>. | |
20 | */ | |
21 | ||
22 | #include <errno.h> | |
23 | #include <limits.h> | |
24 | #include <unistd.h> | |
25 | ||
26 | #include <seccomp.h> | |
27 | ||
28 | #include "util.h" | |
29 | ||
30 | int main(int argc, char *argv[]) | |
31 | { | |
32 | int rc; | |
33 | struct util_options opts; | |
34 | scmp_filter_ctx ctx = NULL; | |
35 | ||
36 | rc = util_getopt(argc, argv, &opts); | |
37 | if (rc < 0) | |
38 | goto out; | |
39 | ||
40 | ctx = seccomp_init(SCMP_ACT_KILL); | |
41 | if (ctx == NULL) | |
42 | return ENOMEM; | |
43 | ||
44 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(open), 0); | |
45 | if (rc != 0) | |
46 | goto out; | |
47 | ||
48 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(close), 0); | |
49 | if (rc != 0) | |
50 | goto out; | |
51 | ||
52 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(read), 3, | |
53 | SCMP_A0(SCMP_CMP_EQ, STDIN_FILENO), | |
54 | SCMP_A1(SCMP_CMP_NE, 0x0), | |
55 | SCMP_A2(SCMP_CMP_LT, SSIZE_MAX)); | |
56 | if (rc != 0) | |
57 | goto out; | |
58 | ||
59 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(write), 3, | |
60 | SCMP_A0(SCMP_CMP_EQ, STDOUT_FILENO), | |
61 | SCMP_A1(SCMP_CMP_NE, 0x0), | |
62 | SCMP_A2(SCMP_CMP_LT, SSIZE_MAX)); | |
63 | if (rc != 0) | |
64 | goto out; | |
65 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(write), 3, | |
66 | SCMP_A0(SCMP_CMP_EQ, STDERR_FILENO), | |
67 | SCMP_A1(SCMP_CMP_NE, 0x0), | |
68 | SCMP_A2(SCMP_CMP_LT, SSIZE_MAX)); | |
69 | if (rc != 0) | |
70 | goto out; | |
71 | ||
72 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(close), 0); | |
73 | if (rc != 0) | |
74 | goto out; | |
75 | ||
76 | rc = seccomp_rule_add(ctx, SCMP_ACT_ALLOW, SCMP_SYS(rt_sigreturn), 0); | |
77 | if (rc != 0) | |
78 | goto out; | |
79 | ||
80 | rc = util_filter_output(&opts, ctx); | |
81 | if (rc) | |
82 | goto out; | |
83 | ||
84 | out: | |
85 | seccomp_release(ctx); | |
86 | return (rc < 0 ? -rc : rc); | |
87 | } |