92 lines
1.6 KiB
C
92 lines
1.6 KiB
C
#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_relabel_raw(const char * scon,
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const char * tcon,
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security_class_t tclass,
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char ** newcon)
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{
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char path[PATH_MAX];
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char *buf;
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size_t size;
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int fd, ret;
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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/relabel", selinux_mnt);
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fd = open(path, O_RDWR);
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if (fd < 0)
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return -1;
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size = selinux_page_size;
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buf = malloc(size);
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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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snprintf(buf, size, "%s %s %hu", scon, tcon, unmap_class(tclass));
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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, size);
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ret = read(fd, buf, size - 1);
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if (ret < 0)
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goto out2;
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*newcon = strdup(buf);
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if (!*newcon) {
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ret = -1;
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goto out2;
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}
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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_relabel_raw)
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int security_compute_relabel(const char * scon,
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const char * tcon,
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security_class_t tclass,
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char ** newcon)
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{
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int ret;
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char * rscon;
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char * rtcon;
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char * rnewcon;
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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_relabel_raw(rscon, rtcon, tclass, &rnewcon);
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freecon(rscon);
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freecon(rtcon);
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if (!ret) {
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ret = selinux_raw_to_trans_context(rnewcon, newcon);
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freecon(rnewcon);
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}
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return ret;
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}
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