1 #include <unistd.h> 2 #include <sys/types.h> 3 #include <fcntl.h> 4 #include <stdlib.h> 5 #include <stdio.h> 6 #include <errno.h> 7 #include <string.h> 8 #include <limits.h> 9 #include "selinux_internal.h" 10 #include "policy.h" 11 #include "mapping.h" 12 13 int security_compute_relabel_raw(const char * scon, 14 const char * tcon, 15 security_class_t tclass, 16 char ** newcon) 17 { 18 char path[PATH_MAX]; 19 char *buf; 20 size_t size; 21 int fd, ret; 22 23 if (!selinux_mnt) { 24 errno = ENOENT; 25 return -1; 26 } 27 28 snprintf(path, sizeof path, "%s/relabel", selinux_mnt); 29 fd = open(path, O_RDWR | O_CLOEXEC); 30 if (fd < 0) 31 return -1; 32 33 size = selinux_page_size; 34 buf = malloc(size); 35 if (!buf) { 36 ret = -1; 37 goto out; 38 } 39 snprintf(buf, size, "%s %s %hu", scon, tcon, unmap_class(tclass)); 40 41 ret = write(fd, buf, strlen(buf)); 42 if (ret < 0) 43 goto out2; 44 45 memset(buf, 0, size); 46 ret = read(fd, buf, size - 1); 47 if (ret < 0) 48 goto out2; 49 50 *newcon = strdup(buf); 51 if (!*newcon) { 52 ret = -1; 53 goto out2; 54 } 55 ret = 0; 56 out2: 57 free(buf); 58 out: 59 close(fd); 60 return ret; 61 } 62 63 hidden_def(security_compute_relabel_raw) 64 65 int security_compute_relabel(const char * scon, 66 const char * tcon, 67 security_class_t tclass, 68 char ** newcon) 69 { 70 int ret; 71 char * rscon; 72 char * rtcon; 73 char * rnewcon; 74 75 if (selinux_trans_to_raw_context(scon, &rscon)) 76 return -1; 77 if (selinux_trans_to_raw_context(tcon, &rtcon)) { 78 freecon(rscon); 79 return -1; 80 } 81 82 ret = security_compute_relabel_raw(rscon, rtcon, tclass, &rnewcon); 83 84 freecon(rscon); 85 freecon(rtcon); 86 if (!ret) { 87 ret = selinux_raw_to_trans_context(rnewcon, newcon); 88 freecon(rnewcon); 89 } 90 91 return ret; 92 } 93
