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#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 */
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