diff options
Diffstat (limited to 'src/faudit/caps.c')
-rw-r--r-- | src/faudit/caps.c | 77 |
1 files changed, 77 insertions, 0 deletions
diff --git a/src/faudit/caps.c b/src/faudit/caps.c new file mode 100644 index 000000000..364cfcd03 --- /dev/null +++ b/src/faudit/caps.c | |||
@@ -0,0 +1,77 @@ | |||
1 | /* | ||
2 | * Copyright (C) 2014-2016 Firejail Authors | ||
3 | * | ||
4 | * This file is part of firejail project | ||
5 | * | ||
6 | * This program is free software; you can redistribute it and/or modify | ||
7 | * it under the terms of the GNU General Public License as published by | ||
8 | * the Free Software Foundation; either version 2 of the License, or | ||
9 | * (at your option) any later version. | ||
10 | * | ||
11 | * This program is distributed in the hope that it will be useful, | ||
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
14 | * GNU General Public License for more details. | ||
15 | * | ||
16 | * You should have received a copy of the GNU General Public License along | ||
17 | * with this program; if not, write to the Free Software Foundation, Inc., | ||
18 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. | ||
19 | */ | ||
20 | #include "faudit.h" | ||
21 | #include <linux/capability.h> | ||
22 | |||
23 | #define MAXBUF 4098 | ||
24 | static int extract_caps(uint64_t *val) { | ||
25 | FILE *fp = fopen("/proc/self/status", "r"); | ||
26 | if (!fp) | ||
27 | return 1; | ||
28 | |||
29 | char buf[MAXBUF]; | ||
30 | while (fgets(buf, MAXBUF, fp)) { | ||
31 | if (strncmp(buf, "CapBnd:\t", 8) == 0) { | ||
32 | char *ptr = buf + 8; | ||
33 | unsigned long long tmp; | ||
34 | sscanf(ptr, "%llx", &tmp); | ||
35 | *val = tmp; | ||
36 | fclose(fp); | ||
37 | return 0; | ||
38 | } | ||
39 | } | ||
40 | |||
41 | fclose(fp); | ||
42 | return 1; | ||
43 | } | ||
44 | |||
45 | // return 1 if the capability is in tbe map | ||
46 | static int check_capability(uint64_t map, int cap) { | ||
47 | int i; | ||
48 | uint64_t mask = 1ULL; | ||
49 | |||
50 | for (i = 0; i < 64; i++, mask <<= 1) { | ||
51 | if ((i == cap) && (mask & map)) | ||
52 | return 1; | ||
53 | } | ||
54 | |||
55 | return 0; | ||
56 | } | ||
57 | |||
58 | void caps(void) { | ||
59 | uint64_t caps_val; | ||
60 | |||
61 | if (extract_caps(&caps_val)) { | ||
62 | printf("SKIP: cannot extract capabilities on this platform\n"); | ||
63 | return; | ||
64 | } | ||
65 | |||
66 | if (caps_val) { | ||
67 | printf("BAD: the capability map is %llx, it should be all zero\n", (unsigned long long) caps_val); | ||
68 | |||
69 | if (check_capability(caps_val, CAP_SYS_ADMIN)) | ||
70 | printf("UGLY: CAP_SYS_ADMIN is enabled\n"); | ||
71 | if (check_capability(caps_val, CAP_SYS_BOOT)) | ||
72 | printf("UGLY: CAP_SYS_BOOT is enabled\n"); | ||
73 | } | ||
74 | else | ||
75 | printf("GOOD: all capabilities are disabled\n"); | ||
76 | } | ||
77 | |||