132 lines
3 KiB
C
132 lines
3 KiB
C
#ifndef SELINUX_H
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#define SELINUX_H
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#ifndef USE_SELINUX
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static inline void selinux_setfilecon(char *file, unsigned int mode) { }
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static inline void selinux_setfscreatecon(char *file, unsigned int mode) {}
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static inline void selinux_init(void) {}
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static inline void selinux_restore(void) {}
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#else
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#include <selinux/selinux.h>
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#include <stdio.h>
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#include <limits.h>
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#include <ctype.h>
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static int selinux_enabled=-1;
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static security_context_t prev_scontext=NULL;
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static inline int is_selinux_running(void) {
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if ( selinux_enabled==-1 )
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return selinux_enabled=is_selinux_enabled()>0;
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return selinux_enabled;
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}
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static inline int selinux_get_media(char *path, int mode, char **media)
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{
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FILE *fp;
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char buf[PATH_MAX];
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char mediabuf[PATH_MAX];
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*media=NULL;
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if (!( mode && S_IFBLK )) {
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return -1;
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}
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snprintf(buf,sizeof(buf), "/proc/ide/%s/media", basename(path));
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fp=fopen(buf,"r");
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if (fp) {
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if (fgets(mediabuf,sizeof(mediabuf), fp)) {
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int size=strlen(mediabuf);
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while (size-- > 0) {
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if (isspace(mediabuf[size])) {
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mediabuf[size]='\0';
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} else {
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break;
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}
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}
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*media=strdup(mediabuf);
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info("selinux_get_media(%s)->%s \n", path, *media);
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}
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fclose(fp);
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return 0;
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} else {
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return -1;
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}
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}
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static inline void selinux_setfilecon(char *file, unsigned int mode) {
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if (is_selinux_running()) {
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security_context_t scontext=NULL;
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char *media;
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int ret=selinux_get_media(file, mode, &media);
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if ( ret== 0) {
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ret = matchmediacon(media, &scontext);
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free(media);
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}
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if (ret==-1)
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if (matchpathcon(file, mode, &scontext) < 0) {
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dbg("matchpathcon(%s) failed\n", file);
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return;
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}
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if (setfilecon(file, scontext) < 0)
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dbg("setfiles %s failed with error '%s'",
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file, strerror(errno));
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freecon(scontext);
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}
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}
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static inline void selinux_setfscreatecon(char *file, unsigned int mode) {
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int retval = 0;
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security_context_t scontext=NULL;
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if (is_selinux_running()) {
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char *media;
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int ret=selinux_get_media(file, mode, &media);
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if ( ret== 0) {
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ret = matchmediacon(media, &scontext);
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free(media);
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}
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if (ret==-1)
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if (matchpathcon(file, mode, &scontext) < 0) {
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dbg("matchpathcon(%s) failed\n", file);
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return;
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}
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retval=setfscreatecon(scontext);
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if (retval < 0)
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dbg("setfiles %s failed with error '%s'",
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file, strerror(errno));
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freecon(scontext);
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}
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}
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static inline void selinux_init(void) {
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/* record the present security context, for file-creation
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* restoration creation purposes.
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*
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*/
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if (is_selinux_running())
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{
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if (getfscreatecon(&prev_scontext) < 0) {
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dbg("getfscreatecon failed\n");
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}
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prev_scontext=NULL;
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}
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}
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static inline void selinux_restore(void) {
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if (is_selinux_running()) {
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/* reset the file create context to its former glory */
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if ( setfscreatecon(prev_scontext) < 0 )
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dbg("setfscreatecon failed\n");
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if (prev_scontext) {
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freecon(prev_scontext);
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prev_scontext=NULL;
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}
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}
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}
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#endif /* USE_SELINUX */
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#endif /* SELINUX_H */
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