Stephen Smalley | f074036 | 2012-01-04 12:30:47 -0500 | [diff] [blame] | 1 | #include <sys/syscall.h> |
| 2 | #include <unistd.h> |
| 3 | #include <fcntl.h> |
| 4 | #include <string.h> |
| 5 | #include <stdlib.h> |
| 6 | #include <stdio.h> |
| 7 | #include <errno.h> |
| 8 | #include "selinux_internal.h" |
| 9 | #include "policy.h" |
| 10 | |
| 11 | #ifdef HOST |
| 12 | static pid_t gettid(void) |
| 13 | { |
| 14 | return syscall(__NR_gettid); |
| 15 | } |
| 16 | #endif |
| 17 | |
| 18 | static int getprocattrcon(security_context_t * context, |
| 19 | pid_t pid, const char *attr) |
| 20 | { |
| 21 | char *path, *buf; |
| 22 | size_t size; |
| 23 | int fd, rc; |
| 24 | ssize_t ret; |
| 25 | pid_t tid; |
| 26 | int errno_hold; |
| 27 | |
| 28 | if (pid > 0) |
| 29 | rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr); |
| 30 | else { |
| 31 | tid = gettid(); |
| 32 | rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr); |
| 33 | } |
| 34 | if (rc < 0) |
| 35 | return -1; |
| 36 | |
| 37 | fd = open(path, O_RDONLY); |
| 38 | free(path); |
| 39 | if (fd < 0) |
| 40 | return -1; |
| 41 | |
| 42 | size = selinux_page_size; |
| 43 | buf = malloc(size); |
| 44 | if (!buf) { |
| 45 | ret = -1; |
| 46 | goto out; |
| 47 | } |
| 48 | memset(buf, 0, size); |
| 49 | |
| 50 | do { |
| 51 | ret = read(fd, buf, size - 1); |
| 52 | } while (ret < 0 && errno == EINTR); |
| 53 | if (ret < 0) |
| 54 | goto out2; |
| 55 | |
| 56 | if (ret == 0) { |
| 57 | *context = NULL; |
| 58 | goto out2; |
| 59 | } |
| 60 | |
| 61 | *context = strdup(buf); |
| 62 | if (!(*context)) { |
| 63 | ret = -1; |
| 64 | goto out2; |
| 65 | } |
| 66 | ret = 0; |
| 67 | out2: |
| 68 | free(buf); |
| 69 | out: |
| 70 | errno_hold = errno; |
| 71 | close(fd); |
| 72 | errno = errno_hold; |
| 73 | return ret; |
| 74 | } |
| 75 | |
| 76 | static int setprocattrcon(security_context_t context, |
| 77 | pid_t pid, const char *attr) |
| 78 | { |
| 79 | char *path; |
| 80 | int fd, rc; |
| 81 | pid_t tid; |
| 82 | ssize_t ret; |
| 83 | int errno_hold; |
| 84 | |
| 85 | if (pid > 0) |
| 86 | rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr); |
| 87 | else { |
| 88 | tid = gettid(); |
| 89 | rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr); |
| 90 | } |
| 91 | if (rc < 0) |
| 92 | return -1; |
| 93 | |
| 94 | fd = open(path, O_RDWR); |
| 95 | free(path); |
| 96 | if (fd < 0) |
| 97 | return -1; |
| 98 | if (context) |
| 99 | do { |
| 100 | ret = write(fd, context, strlen(context) + 1); |
| 101 | } while (ret < 0 && errno == EINTR); |
| 102 | else |
| 103 | do { |
| 104 | ret = write(fd, NULL, 0); /* clear */ |
| 105 | } while (ret < 0 && errno == EINTR); |
| 106 | errno_hold = errno; |
| 107 | close(fd); |
| 108 | errno = errno_hold; |
| 109 | if (ret < 0) |
| 110 | return -1; |
| 111 | else |
| 112 | return 0; |
| 113 | } |
| 114 | |
| 115 | #define getselfattr_def(fn, attr) \ |
| 116 | int get##fn(security_context_t *c) \ |
| 117 | { \ |
| 118 | return getprocattrcon(c, 0, #attr); \ |
| 119 | } |
| 120 | |
| 121 | #define setselfattr_def(fn, attr) \ |
| 122 | int set##fn(const security_context_t c) \ |
| 123 | { \ |
| 124 | return setprocattrcon(c, 0, #attr); \ |
| 125 | } |
| 126 | |
| 127 | #define all_selfattr_def(fn, attr) \ |
| 128 | getselfattr_def(fn, attr) \ |
| 129 | setselfattr_def(fn, attr) |
| 130 | |
| 131 | #define getpidattr_def(fn, attr) \ |
| 132 | int get##fn(pid_t pid, security_context_t *c) \ |
| 133 | { \ |
| 134 | return getprocattrcon(c, pid, #attr); \ |
| 135 | } |
| 136 | |
| 137 | all_selfattr_def(con, current) |
| 138 | getpidattr_def(pidcon, current) |
| 139 | getselfattr_def(prevcon, prev) |
| 140 | all_selfattr_def(execcon, exec) |
| 141 | all_selfattr_def(fscreatecon, fscreate) |
| 142 | all_selfattr_def(sockcreatecon, sockcreate) |
| 143 | all_selfattr_def(keycreatecon, keycreate) |
| 144 | |
| 145 | hidden_def(getcon_raw) |
| 146 | hidden_def(getcon) |
| 147 | hidden_def(getexeccon_raw) |
| 148 | hidden_def(getfilecon_raw) |
| 149 | hidden_def(getfilecon) |
| 150 | hidden_def(getfscreatecon_raw) |
| 151 | hidden_def(getkeycreatecon_raw) |
| 152 | hidden_def(getpeercon_raw) |
| 153 | hidden_def(getpidcon_raw) |
| 154 | hidden_def(getprevcon_raw) |
| 155 | hidden_def(getprevcon) |
| 156 | hidden_def(getsockcreatecon_raw) |
| 157 | hidden_def(setcon_raw) |
| 158 | hidden_def(setexeccon_raw) |
| 159 | hidden_def(setexeccon) |
| 160 | hidden_def(setfilecon_raw) |
| 161 | hidden_def(setfscreatecon_raw) |
| 162 | hidden_def(setkeycreatecon_raw) |
| 163 | hidden_def(setsockcreatecon_raw) |