summaryrefslogtreecommitdiff
path: root/selinux.h
blob: 475a60d6d2abd5e4340c830ee67895daceed3090 (plain)
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
#ifndef SELINUX_H
#define SELINUX_H

#ifndef USE_SELINUX

static inline void selinux_setfilecon(char *file, unsigned int mode) { }
static inline void selinux_setfscreatecon(char *file, unsigned int mode) {}
static inline void selinux_init(void) {}
static inline void selinux_restore(void) {}

#else

#include <selinux/selinux.h>
#include <stdio.h>
#include <limits.h>
#include <ctype.h>


static int selinux_enabled=-1;
static security_context_t prev_scontext=NULL;

static inline int is_selinux_running(void) {
	if ( selinux_enabled==-1 ) 
		return selinux_enabled=is_selinux_enabled()>0;
	return selinux_enabled;
}

static inline int selinux_get_media(char *path, int mode, char **media)
{
  FILE *fp;
  char buf[PATH_MAX];
  char mediabuf[PATH_MAX];
  *media=NULL;
  if (!( mode && S_IFBLK )) {
	  return -1;
  }
  snprintf(buf,sizeof(buf), "/proc/ide/%s/media", basename(path));
  fp=fopen(buf,"r");
  if (fp) {
	  if (fgets(mediabuf,sizeof(mediabuf), fp)) {
		  int size=strlen(mediabuf);
		  while (size-- > 0) {
			  if (isspace(mediabuf[size])) {
				  mediabuf[size]='\0';
			  } else {
				  break;
			  }
		  }
		  *media=strdup(mediabuf);
		  info("selinux_get_media(%s)->%s \n", path, *media);
	  }
    fclose(fp);
    return 0;
  } else {
    return -1;
  }
}

static inline void selinux_setfilecon(char *file, unsigned int mode) { 
	if (is_selinux_running()) {
		security_context_t scontext=NULL;
		char *media;
		int ret=selinux_get_media(file, mode, &media);
		if ( ret== 0) {
			ret = matchmediacon(media, &scontext);
			free(media);
		} 
		if (ret==-1) 
			if (matchpathcon(file, mode, &scontext) < 0) {
				dbg("matchpathcon(%s) failed\n", file);
				return;
			} 
		if (setfilecon(file, scontext) < 0)
			dbg("setfiles %s failed with error '%s'",
			    file, strerror(errno));
		freecon(scontext);
	}
}

static inline void selinux_setfscreatecon(char *file, unsigned int mode) {
	int retval = 0;
	security_context_t scontext=NULL;

	if (is_selinux_running()) {
		char *media;
		int ret=selinux_get_media(file, mode, &media);
		if ( ret== 0) {
			ret = matchmediacon(media, &scontext);
			free(media);
		} 

		if (ret==-1) 
			if (matchpathcon(file, mode, &scontext) < 0) {
				dbg("matchpathcon(%s) failed\n", file);
				return;
			} 

		retval=setfscreatecon(scontext);
		if (retval < 0)
			dbg("setfiles %s failed with error '%s'",
			    file, strerror(errno));
		freecon(scontext);
	}
}
static inline void selinux_init(void) {
	/* record the present security context, for file-creation
	 * restoration creation purposes.
	 *
	 */

	if (is_selinux_running())
	{
		if (getfscreatecon(&prev_scontext) < 0) {
			dbg("getfscreatecon failed\n");
		}
		prev_scontext=NULL;
	}
}
static inline void selinux_restore(void) {
	if (is_selinux_running()) {
		/* reset the file create context to its former glory */
		if ( setfscreatecon(prev_scontext) < 0 )
			dbg("setfscreatecon failed\n");
		if (prev_scontext) {
			freecon(prev_scontext);
			prev_scontext=NULL;
		}
	}
}
#endif /* USE_SELINUX */
#endif /* SELINUX_H */