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#include <unistd.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include <limits.h>
#include "selinux_internal.h"
#include "policy.h"
#include "mapping.h"
int security_validatetrans_raw(const char *scon,
const char *tcon,
security_class_t tclass,
const char *newcon)
{
char path[PATH_MAX];
char *buf = NULL;
int size, bufsz;
int fd, ret = -1;
errno = ENOENT;
if (!selinux_mnt) {
return -1;
}
snprintf(path, sizeof path, "%s/validatetrans", selinux_mnt);
fd = open(path, O_WRONLY | O_CLOEXEC);
if (fd < 0) {
return -1;
}
errno = EINVAL;
size = selinux_page_size;
buf = malloc(size);
if (!buf) {
goto out;
}
bufsz = snprintf(buf, size, "%s %s %hu %s", scon, tcon, unmap_class(tclass), newcon);
if (bufsz >= size || bufsz < 0) {
// It got truncated or there was an encoding error
goto out;
}
// clear errno for write()
errno = 0;
ret = write(fd, buf, strlen(buf));
if (ret > 0) {
// The kernel returns the bytes written on success, not 0 as noted in the commit message
ret = 0;
}
out:
free(buf);
close(fd);
return ret;
}
hidden_def(security_validatetrans_raw)
int security_validatetrans(const char *scon,
const char *tcon,
security_class_t tclass,
const char *newcon)
{
int ret = -1;
char *rscon = NULL;
char *rtcon = NULL;
char *rnewcon = NULL;
if (selinux_trans_to_raw_context(scon, &rscon)) {
goto out;
}
if (selinux_trans_to_raw_context(tcon, &rtcon)) {
goto out;
}
if (selinux_trans_to_raw_context(newcon, &rnewcon)) {
goto out;
}
ret = security_validatetrans_raw(rscon, rtcon, tclass, rnewcon);
out:
freecon(rnewcon);
freecon(rtcon);
freecon(rscon);
return ret;
}
hidden_def(security_validatetrans)
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