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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 "selinux_internal.h"
| #include "policy.h"
| #include <limits.h>
|
| int security_compute_user_raw(const char * scon,
| const char *user, char *** con)
| {
| char path[PATH_MAX];
| char **ary;
| char *buf, *ptr;
| size_t size;
| int fd, ret;
| unsigned int i, nel;
|
| if (!selinux_mnt) {
| errno = ENOENT;
| return -1;
| }
|
| snprintf(path, sizeof path, "%s/user", selinux_mnt);
| fd = open(path, O_RDWR | O_CLOEXEC);
| if (fd < 0)
| return -1;
|
| size = selinux_page_size;
| buf = malloc(size);
| if (!buf) {
| ret = -1;
| goto out;
| }
| snprintf(buf, size, "%s %s", scon, user);
|
| ret = write(fd, buf, strlen(buf));
| if (ret < 0)
| goto out2;
|
| memset(buf, 0, size);
| ret = read(fd, buf, size - 1);
| if (ret < 0)
| goto out2;
|
| if (sscanf(buf, "%u", &nel) != 1) {
| ret = -1;
| goto out2;
| }
|
| ary = malloc((nel + 1) * sizeof(char *));
| if (!ary) {
| ret = -1;
| goto out2;
| }
|
| ptr = buf + strlen(buf) + 1;
| for (i = 0; i < nel; i++) {
| ary[i] = strdup(ptr);
| if (!ary[i]) {
| freeconary(ary);
| ret = -1;
| goto out2;
| }
| ptr += strlen(ptr) + 1;
| }
| ary[nel] = NULL;
| *con = ary;
| ret = 0;
| out2:
| free(buf);
| out:
| close(fd);
| return ret;
| }
|
| hidden_def(security_compute_user_raw)
|
| int security_compute_user(const char * scon,
| const char *user, char *** con)
| {
| int ret;
| char * rscon;
|
| if (selinux_trans_to_raw_context(scon, &rscon))
| return -1;
|
| ret = security_compute_user_raw(rscon, user, con);
|
| freecon(rscon);
| if (!ret) {
| char **ptr, *tmpcon;
| for (ptr = *con; *ptr; ptr++) {
| if (selinux_raw_to_trans_context(*ptr, &tmpcon)) {
| freeconary(*con);
| *con = NULL;
| return -1;
| }
| freecon(*ptr);
| *ptr = tmpcon;
| }
| }
|
| return ret;
| }
|
| hidden_def(security_compute_user)
|
|
