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