| #include <sys/syscall.h> |
| #include <unistd.h> |
| #include <fcntl.h> |
| #include <string.h> |
| #include <stdlib.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include "selinux_internal.h" |
| #include "policy.h" |
| |
| #ifdef HOST |
| static pid_t gettid(void) |
| { |
| return syscall(__NR_gettid); |
| } |
| #endif |
| |
| static int openattr(pid_t pid, const char *attr, int flags) |
| { |
| int fd, rc; |
| char *path; |
| pid_t tid; |
| |
| if (pid > 0) { |
| rc = asprintf(&path, "/proc/%d/attr/%s", pid, attr); |
| } else if (pid == 0) { |
| rc = asprintf(&path, "/proc/thread-self/attr/%s", attr); |
| if (rc < 0) |
| return -1; |
| fd = open(path, flags | O_CLOEXEC); |
| if (fd >= 0 || errno != ENOENT) |
| goto out; |
| free(path); |
| tid = gettid(); |
| rc = asprintf(&path, "/proc/self/task/%d/attr/%s", tid, attr); |
| } else { |
| errno = EINVAL; |
| return -1; |
| } |
| if (rc < 0) |
| return -1; |
| |
| fd = open(path, flags | O_CLOEXEC); |
| out: |
| free(path); |
| return fd; |
| } |
| |
| static int getprocattrcon(char ** context, |
| pid_t pid, const char *attr) |
| { |
| char *buf; |
| size_t size; |
| int fd; |
| ssize_t ret; |
| int errno_hold; |
| |
| fd = openattr(pid, attr, O_RDONLY); |
| if (fd < 0) |
| return -1; |
| |
| size = selinux_page_size; |
| buf = malloc(size); |
| if (!buf) { |
| ret = -1; |
| goto out; |
| } |
| memset(buf, 0, size); |
| |
| do { |
| ret = read(fd, buf, size - 1); |
| } while (ret < 0 && errno == EINTR); |
| if (ret < 0) |
| goto out2; |
| |
| if (ret == 0) { |
| *context = NULL; |
| goto out2; |
| } |
| |
| *context = strdup(buf); |
| if (!(*context)) { |
| ret = -1; |
| goto out2; |
| } |
| ret = 0; |
| out2: |
| free(buf); |
| out: |
| errno_hold = errno; |
| close(fd); |
| errno = errno_hold; |
| return ret; |
| } |
| |
| static int setprocattrcon(const char * context, |
| pid_t pid, const char *attr) |
| { |
| int fd; |
| ssize_t ret; |
| int errno_hold; |
| |
| fd = openattr(pid, attr, O_RDWR); |
| if (fd < 0) |
| return -1; |
| if (context) |
| do { |
| ret = write(fd, context, strlen(context) + 1); |
| } while (ret < 0 && errno == EINTR); |
| else |
| do { |
| ret = write(fd, NULL, 0); /* clear */ |
| } while (ret < 0 && errno == EINTR); |
| errno_hold = errno; |
| close(fd); |
| errno = errno_hold; |
| if (ret < 0) |
| return -1; |
| else |
| return 0; |
| } |
| |
| #define getselfattr_def(fn, attr) \ |
| int get##fn(char **c) \ |
| { \ |
| return getprocattrcon(c, 0, #attr); \ |
| } |
| |
| #define setselfattr_def(fn, attr) \ |
| int set##fn(const char * c) \ |
| { \ |
| return setprocattrcon(c, 0, #attr); \ |
| } |
| |
| #define all_selfattr_def(fn, attr) \ |
| getselfattr_def(fn, attr) \ |
| setselfattr_def(fn, attr) |
| |
| #define getpidattr_def(fn, attr) \ |
| int get##fn(pid_t pid, char **c) \ |
| { \ |
| if (pid <= 0) { \ |
| errno = EINVAL; \ |
| return -1; \ |
| } else { \ |
| return getprocattrcon(c, pid, #attr); \ |
| } \ |
| } |
| |
| all_selfattr_def(con, current) |
| getpidattr_def(pidcon, current) |
| getselfattr_def(prevcon, prev) |
| all_selfattr_def(execcon, exec) |
| all_selfattr_def(fscreatecon, fscreate) |
| all_selfattr_def(sockcreatecon, sockcreate) |
| all_selfattr_def(keycreatecon, keycreate) |
| |
| hidden_def(getcon_raw) |
| hidden_def(getcon) |
| hidden_def(getexeccon_raw) |
| hidden_def(getfilecon_raw) |
| hidden_def(getfilecon) |
| hidden_def(getfscreatecon_raw) |
| hidden_def(getkeycreatecon_raw) |
| hidden_def(getpeercon_raw) |
| hidden_def(getpidcon_raw) |
| hidden_def(getprevcon_raw) |
| hidden_def(getprevcon) |
| hidden_def(getsockcreatecon_raw) |
| hidden_def(setcon_raw) |
| hidden_def(setexeccon_raw) |
| hidden_def(setexeccon) |
| hidden_def(setfilecon_raw) |
| hidden_def(setfscreatecon_raw) |
| hidden_def(setkeycreatecon_raw) |
| hidden_def(setsockcreatecon_raw) |