Joshua Brindle | 13cd4c8 | 2008-08-19 15:30:36 -0400 | [diff] [blame^] | 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 "selinux_internal.h" |
| 9 | #include "policy.h" |
| 10 | #include <limits.h> |
| 11 | |
| 12 | int security_canonicalize_context_raw(security_context_t con, |
| 13 | security_context_t * canoncon) |
| 14 | { |
| 15 | char path[PATH_MAX]; |
| 16 | char *buf; |
| 17 | size_t size; |
| 18 | int fd, ret; |
| 19 | |
| 20 | if (!selinux_mnt) { |
| 21 | errno = ENOENT; |
| 22 | return -1; |
| 23 | } |
| 24 | |
| 25 | snprintf(path, sizeof path, "%s/context", selinux_mnt); |
| 26 | fd = open(path, O_RDWR); |
| 27 | if (fd < 0) |
| 28 | return -1; |
| 29 | |
| 30 | size = selinux_page_size; |
| 31 | buf = malloc(size); |
| 32 | if (!buf) { |
| 33 | ret = -1; |
| 34 | goto out; |
| 35 | } |
| 36 | strncpy(buf, con, size); |
| 37 | |
| 38 | ret = write(fd, buf, strlen(buf) + 1); |
| 39 | if (ret < 0) |
| 40 | goto out2; |
| 41 | |
| 42 | memset(buf, 0, size); |
| 43 | ret = read(fd, buf, size - 1); |
| 44 | if (ret < 0 && errno == EINVAL) { |
| 45 | /* Fall back to the original context for kernels |
| 46 | that do not support the extended interface. */ |
| 47 | strncpy(buf, con, size); |
| 48 | } |
| 49 | |
| 50 | *canoncon = strdup(buf); |
| 51 | if (!(*canoncon)) { |
| 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_canonicalize_context_raw) |
| 64 | |
| 65 | int security_canonicalize_context(security_context_t con, |
| 66 | security_context_t * canoncon) |
| 67 | { |
| 68 | int ret; |
| 69 | security_context_t rcon = con; |
| 70 | security_context_t rcanoncon; |
| 71 | |
| 72 | if (selinux_trans_to_raw_context(con, &rcon)) |
| 73 | return -1; |
| 74 | |
| 75 | ret = security_canonicalize_context_raw(rcon, &rcanoncon); |
| 76 | |
| 77 | freecon(rcon); |
| 78 | if (!ret) { |
| 79 | ret = selinux_raw_to_trans_context(rcanoncon, canoncon); |
| 80 | freecon(rcanoncon); |
| 81 | } |
| 82 | |
| 83 | return ret; |
| 84 | } |
| 85 | |
| 86 | hidden_def(security_canonicalize_context) |