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selinux: introduce mac_selinux_create_file_prepare_at()

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This commit is contained in:
Franck Bui 2018-07-02 10:22:56 +02:00
parent 2c3d5adde0
commit 7e531a5265
2 changed files with 68 additions and 26 deletions
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93
src/basic/selinux-util.c
View File

@ -316,47 +316,88 @@ char* mac_selinux_free(char *label) {
return NULL;
}
int mac_selinux_create_file_prepare(const char *path, mode_t mode) {
#if HAVE_SELINUX
static int selinux_create_file_prepare_abspath(const char *abspath, mode_t mode) {
_cleanup_freecon_ char *filecon = NULL;
_cleanup_free_ char *path = NULL;
int r;
assert(abspath);
assert(path_is_absolute(abspath));
r = selabel_lookup_raw(label_hnd, &filecon, abspath, mode);
if (r < 0) {
/* No context specified by the policy? Proceed without setting it. */
if (errno == ENOENT)
return 0;
log_enforcing_errno(errno, "Failed to determine SELinux security context for %s: %m", abspath);
} else {
if (setfscreatecon_raw(filecon) >= 0)
return 0; /* Success! */
log_enforcing_errno(errno, "Failed to set SELinux security context %s for %s: %m", filecon, abspath);
}
if (security_getenforce() > 0)
return -errno;
return 0;
}
#endif
int mac_selinux_create_file_prepare_at(int dirfd, const char *path, mode_t mode) {
int r = 0;
#if HAVE_SELINUX
_cleanup_freecon_ char *filecon = NULL;
int r;
_cleanup_free_ char *abspath = NULL;
_cleanup_close_ int fd = -1;
assert(path);
if (!label_hnd)
return 0;
if (path_is_absolute(path))
r = selabel_lookup_raw(label_hnd, &filecon, path, mode);
else {
_cleanup_free_ char *newpath = NULL;
if (!path_is_absolute(path)) {
_cleanup_free_ char *p = NULL;
r = path_make_absolute_cwd(path, &newpath);
if (dirfd == AT_FDCWD)
r = safe_getcwd(&p);
else
r = fd_get_path(dirfd, &p);
if (r < 0)
return r;
r = selabel_lookup_raw(label_hnd, &filecon, newpath, mode);
abspath = path_join(NULL, p, path);
if (!abspath)
return -ENOMEM;
path = abspath;
}
if (r < 0) {
/* No context specified by the policy? Proceed without setting it. */
if (errno == ENOENT)
return 0;
log_enforcing_errno(errno, "Failed to determine SELinux security context for %s: %m", path);
} else {
if (setfscreatecon_raw(filecon) >= 0)
return 0; /* Success! */
log_enforcing_errno(errno, "Failed to set SELinux security context %s for %s: %m", filecon, path);
}
if (security_getenforce() > 0)
return -errno;
r = selinux_create_file_prepare_abspath(path, mode);
#endif
return 0;
return r;
}
int mac_selinux_create_file_prepare(const char *path, mode_t mode) {
int r = 0;
#if HAVE_SELINUX
_cleanup_free_ char *abspath = NULL;
assert(path);
if (!label_hnd)
return 0;
r = path_make_absolute_cwd(path, &abspath);
if (r < 0)
return r;
r = selinux_create_file_prepare_abspath(abspath, mode);
#endif
return r;
}
void mac_selinux_create_file_clear(void) {

1
src/basic/selinux-util.h
View File

@ -23,6 +23,7 @@ int mac_selinux_get_child_mls_label(int socket_fd, const char *exe, const char *
char* mac_selinux_free(char *label);
int mac_selinux_create_file_prepare(const char *path, mode_t mode);
int mac_selinux_create_file_prepare_at(int dirfd, const char *path, mode_t mode);
void mac_selinux_create_file_clear(void);
int mac_selinux_create_socket_prepare(const char *label);