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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_compute_av_flags_raw(const char * scon,
const char * tcon,
security_class_t tclass,
access_vector_t requested,
struct av_decision *avd)
{
char path[PATH_MAX];
char *buf;
size_t len;
int fd, ret;
security_class_t kclass;
if (!selinux_mnt) {
errno = ENOENT;
return -1;
}
snprintf(path, sizeof path, "%s/access", selinux_mnt);
fd = open(path, O_RDWR | O_CLOEXEC);
if (fd < 0)
return -1;
len = selinux_page_size;
buf = malloc(len);
if (!buf) {
ret = -1;
goto out;
}
kclass = unmap_class(tclass);
snprintf(buf, len, "%s %s %hu %x", scon, tcon,
kclass, unmap_perm(tclass, requested));
ret = write(fd, buf, strlen(buf));
if (ret < 0)
goto out2;
memset(buf, 0, len);
ret = read(fd, buf, len - 1);
if (ret < 0)
goto out2;
ret = sscanf(buf, "%x %x %x %x %u %x",
&avd->allowed, &avd->decided,
&avd->auditallow, &avd->auditdeny,
&avd->seqno, &avd->flags);
if (ret < 5) {
ret = -1;
goto out2;
} else if (ret < 6)
avd->flags = 0;
/*
* If the tclass could not be mapped to a kernel class at all, the
* kernel will have already set avd according to the
* handle_unknown flag and we do not need to do anything further.
* Otherwise, we must map the permissions within the returned
* avd to the userspace permission values.
*/
if (kclass != 0)
map_decision(tclass, avd);
ret = 0;
out2:
free(buf);
out:
close(fd);
return ret;
}
hidden_def(security_compute_av_flags_raw)
int security_compute_av_raw(const char * scon,
const char * tcon,
security_class_t tclass,
access_vector_t requested,
struct av_decision *avd)
{
struct av_decision lavd;
int ret;
ret = security_compute_av_flags_raw(scon, tcon, tclass,
requested, &lavd);
if (ret == 0) {
avd->allowed = lavd.allowed;
avd->decided = lavd.decided;
avd->auditallow = lavd.auditallow;
avd->auditdeny = lavd.auditdeny;
avd->seqno = lavd.seqno;
/* NOTE:
* We should not return avd->flags via the interface
* due to the binary compatibility.
*/
}
return ret;
}
hidden_def(security_compute_av_raw)
int security_compute_av_flags(const char * scon,
const char * tcon,
security_class_t tclass,
access_vector_t requested,
struct av_decision *avd)
{
char * rscon;
char * rtcon;
int ret;
if (selinux_trans_to_raw_context(scon, &rscon))
return -1;
if (selinux_trans_to_raw_context(tcon, &rtcon)) {
freecon(rscon);
return -1;
}
ret = security_compute_av_flags_raw(rscon, rtcon, tclass,
requested, avd);
freecon(rscon);
freecon(rtcon);
return ret;
}
hidden_def(security_compute_av_flags)
int security_compute_av(const char * scon,
const char * tcon,
security_class_t tclass,
access_vector_t requested, struct av_decision *avd)
{
struct av_decision lavd;
int ret;
ret = security_compute_av_flags(scon, tcon, tclass,
requested, &lavd);
if (ret == 0)
{
avd->allowed = lavd.allowed;
avd->decided = lavd.decided;
avd->auditallow = lavd.auditallow;
avd->auditdeny = lavd.auditdeny;
avd->seqno = lavd.seqno;
/* NOTE:
* We should not return avd->flags via the interface
* due to the binary compatibility.
*/
}
return ret;
}
hidden_def(security_compute_av)
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