1 /*
2 * User-supplied callbacks and default implementations.
3 * Class and permission mappings.
4 */
5
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <stdarg.h>
9 #include <errno.h>
10 #include <selinux/selinux.h>
11 #include "callbacks.h"
12
13 /* default implementations */
14 static int __attribute__ ((format(printf, 2, 3)))
default_selinux_log(int type,const char * fmt,...)15 default_selinux_log(int type __attribute__((unused)), const char *fmt, ...)
16 {
17 int rc;
18 va_list ap;
19 va_start(ap, fmt);
20 rc = vfprintf(stderr, fmt, ap);
21 va_end(ap);
22 return rc;
23 }
24
25 static int
default_selinux_audit(void * ptr,security_class_t cls,char * buf,size_t len)26 default_selinux_audit(void *ptr __attribute__((unused)),
27 security_class_t cls __attribute__((unused)),
28 char *buf __attribute__((unused)),
29 size_t len __attribute__((unused)))
30 {
31 return 0;
32 }
33
34 static int
default_selinux_validate(char ** ctx)35 default_selinux_validate(char **ctx)
36 {
37 return security_check_context(*ctx);
38 }
39
40 static int
default_selinux_setenforce(int enforcing)41 default_selinux_setenforce(int enforcing __attribute__((unused)))
42 {
43 return 0;
44 }
45
46 static int
default_selinux_policyload(int seqno)47 default_selinux_policyload(int seqno __attribute__((unused)))
48 {
49 return 0;
50 }
51
52 /* callback pointers */
53 int __attribute__ ((format(printf, 2, 3)))
54 (*selinux_log)(int, const char *, ...) =
55 default_selinux_log;
56
57 int
58 (*selinux_audit) (void *, security_class_t, char *, size_t) =
59 default_selinux_audit;
60
61 int
62 (*selinux_validate)(char **ctx) =
63 default_selinux_validate;
64
65 int
66 (*selinux_netlink_setenforce) (int enforcing) =
67 default_selinux_setenforce;
68
69 int
70 (*selinux_netlink_policyload) (int seqno) =
71 default_selinux_policyload;
72
73 /* callback setting function */
74 void
selinux_set_callback(int type,union selinux_callback cb)75 selinux_set_callback(int type, union selinux_callback cb)
76 {
77 switch (type) {
78 case SELINUX_CB_LOG:
79 selinux_log = cb.func_log;
80 break;
81 case SELINUX_CB_AUDIT:
82 selinux_audit = cb.func_audit;
83 break;
84 case SELINUX_CB_VALIDATE:
85 selinux_validate = cb.func_validate;
86 break;
87 case SELINUX_CB_SETENFORCE:
88 selinux_netlink_setenforce = cb.func_setenforce;
89 break;
90 case SELINUX_CB_POLICYLOAD:
91 selinux_netlink_policyload = cb.func_policyload;
92 break;
93 }
94 }
95
96 /* callback getting function */
97 union selinux_callback
selinux_get_callback(int type)98 selinux_get_callback(int type)
99 {
100 union selinux_callback cb;
101
102 switch (type) {
103 case SELINUX_CB_LOG:
104 cb.func_log = selinux_log;
105 break;
106 case SELINUX_CB_AUDIT:
107 cb.func_audit = selinux_audit;
108 break;
109 case SELINUX_CB_VALIDATE:
110 cb.func_validate = selinux_validate;
111 break;
112 case SELINUX_CB_SETENFORCE:
113 cb.func_setenforce = selinux_netlink_setenforce;
114 break;
115 case SELINUX_CB_POLICYLOAD:
116 cb.func_policyload = selinux_netlink_policyload;
117 break;
118 default:
119 memset(&cb, 0, sizeof(cb));
120 errno = EINVAL;
121 break;
122 }
123 return cb;
124 }
125