diff options
Diffstat (limited to 'src/shared')
| -rw-r--r-- | src/shared/label.c | 554 | ||||
| -rw-r--r-- | src/shared/label.h | 31 | ||||
| -rw-r--r-- | src/shared/mkdir-label.c | 26 | ||||
| -rw-r--r-- | src/shared/mkdir.h | 2 | ||||
| -rw-r--r-- | src/shared/selinux-util.c | 481 | ||||
| -rw-r--r-- | src/shared/selinux-util.h | 27 | ||||
| -rw-r--r-- | src/shared/smack-util.c | 45 | ||||
| -rw-r--r-- | src/shared/smack-util.h | 1 |
8 files changed, 575 insertions, 592 deletions
diff --git a/src/shared/label.c b/src/shared/label.c index 69d4616183..b48a4ff6f8 100644 --- a/src/shared/label.c +++ b/src/shared/label.c @@ -19,170 +19,8 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ -#include <errno.h> -#include <unistd.h> -#include <malloc.h> -#include <sys/socket.h> -#include <sys/un.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <fcntl.h> -#include <sys/xattr.h> -#ifdef HAVE_SELINUX -#include <selinux/selinux.h> -#include <selinux/label.h> -#include <selinux/context.h> -#endif - #include "label.h" -#include "strv.h" #include "util.h" -#include "path-util.h" -#include "selinux-util.h" -#include "smack-util.h" - -#ifdef HAVE_SELINUX -DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon); -DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free); - -#define _cleanup_security_context_free_ _cleanup_(freeconp) -#define _cleanup_context_free_ _cleanup_(context_freep) - -static struct selabel_handle *label_hnd = NULL; -#endif - -static int smack_relabel_in_dev(const char *path) { - int r = 0; - -#ifdef HAVE_SMACK - struct stat sb; - const char *label; - - /* - * Path must be in /dev and must exist - */ - if (!path_startswith(path, "/dev")) - return 0; - - r = lstat(path, &sb); - if (r < 0) - return -errno; - - /* - * Label directories and character devices "*". - * Label symlinks "_". - * Don't change anything else. - */ - if (S_ISDIR(sb.st_mode)) - label = SMACK_STAR_LABEL; - else if (S_ISLNK(sb.st_mode)) - label = SMACK_FLOOR_LABEL; - else if (S_ISCHR(sb.st_mode)) - label = SMACK_STAR_LABEL; - else - return 0; - - r = setxattr(path, "security.SMACK64", label, strlen(label), 0); - if (r < 0) { - log_error("Smack relabeling \"%s\" %m", path); - return -errno; - } -#endif - - return r; -} - -int label_init(const char *prefix) { - int r = 0; - -#ifdef HAVE_SELINUX - usec_t before_timestamp, after_timestamp; - struct mallinfo before_mallinfo, after_mallinfo; - - if (!use_selinux()) - return 0; - - if (label_hnd) - return 0; - - before_mallinfo = mallinfo(); - before_timestamp = now(CLOCK_MONOTONIC); - - if (prefix) { - struct selinux_opt options[] = { - { .type = SELABEL_OPT_SUBSET, .value = prefix }, - }; - - label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options)); - } else - label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0); - - if (!label_hnd) { - log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, - "Failed to initialize SELinux context: %m"); - r = security_getenforce() == 1 ? -errno : 0; - } else { - char timespan[FORMAT_TIMESPAN_MAX]; - int l; - - after_timestamp = now(CLOCK_MONOTONIC); - after_mallinfo = mallinfo(); - - l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0; - - log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.", - format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0), - (l+1023)/1024); - } -#endif - - return r; -} - -static int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs) { - int r = 0; - -#ifdef HAVE_SELINUX - struct stat st; - security_context_t fcon; - - if (!label_hnd) - return 0; - - r = lstat(path, &st); - if (r == 0) { - r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode); - - /* If there's no label to set, then exit without warning */ - if (r < 0 && errno == ENOENT) - return 0; - - if (r == 0) { - r = lsetfilecon(path, fcon); - freecon(fcon); - - /* If the FS doesn't support labels, then exit without warning */ - if (r < 0 && errno == ENOTSUP) - return 0; - } - } - - if (r < 0) { - /* Ignore ENOENT in some cases */ - if (ignore_enoent && errno == ENOENT) - return 0; - - if (ignore_erofs && errno == EROFS) - return 0; - - log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, - "Unable to fix label of %s: %m", path); - r = security_getenforce() == 1 ? -errno : 0; - } -#endif - - return r; -} int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { int r = 0; @@ -201,395 +39,3 @@ int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { return r; } - -void label_finish(void) { - -#ifdef HAVE_SELINUX - if (!use_selinux()) - return; - - if (label_hnd) - selabel_close(label_hnd); -#endif -} - -int label_get_create_label_from_exe(const char *exe, char **label) { - - int r = 0; - -#ifdef HAVE_SELINUX - security_context_t mycon = NULL, fcon = NULL; - security_class_t sclass; - - if (!use_selinux()) { - *label = NULL; - return 0; - } - - r = getcon(&mycon); - if (r < 0) - goto fail; - - r = getfilecon(exe, &fcon); - if (r < 0) - goto fail; - - sclass = string_to_security_class("process"); - r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label); - if (r == 0) - log_debug("SELinux Socket context for %s will be set to %s", exe, *label); - -fail: - if (r < 0 && security_getenforce() == 1) - r = -errno; - - freecon(mycon); - freecon(fcon); -#endif - - return r; -} - -int label_get_our_label(char **label) { - int r = -EOPNOTSUPP; - -#ifdef HAVE_SELINUX - char *l = NULL; - - r = getcon(&l); - if (r < 0) - return r; - - *label = l; -#endif - - return r; -} - -int label_get_child_mls_label(int socket_fd, const char *exe, char **label) { - int r = -EOPNOTSUPP; - -#ifdef HAVE_SELINUX - - _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = NULL; - _cleanup_context_free_ context_t pcon = NULL, bcon = NULL; - security_class_t sclass; - - const char *range = NULL; - - assert(socket_fd >= 0); - assert(exe); - assert(label); - - r = getcon(&mycon); - if (r < 0) { - r = -EINVAL; - goto out; - } - - r = getpeercon(socket_fd, &peercon); - if (r < 0) { - r = -EINVAL; - goto out; - } - - r = getexeccon(&fcon); - if (r < 0) { - r = -EINVAL; - goto out; - } - - if (!fcon) { - /* If there is no context set for next exec let's use context - of target executable */ - r = getfilecon(exe, &fcon); - if (r < 0) { - r = -errno; - goto out; - } - } - - bcon = context_new(mycon); - if (!bcon) { - r = -ENOMEM; - goto out; - } - - pcon = context_new(peercon); - if (!pcon) { - r = -ENOMEM; - goto out; - } - - range = context_range_get(pcon); - if (!range) { - r = -errno; - goto out; - } - - r = context_range_set(bcon, range); - if (r) { - r = -errno; - goto out; - } - - freecon(mycon); - mycon = strdup(context_str(bcon)); - if (!mycon) { - r = -errno; - goto out; - } - - sclass = string_to_security_class("process"); - r = security_compute_create(mycon, fcon, sclass, &ret); - if (r < 0) { - r = -EINVAL; - goto out; - } - - *label = ret; - ret = NULL; - r = 0; - -out: - if (r < 0 && security_getenforce() == 1) - return r; -#endif - return r; -} - -int label_context_set(const char *path, mode_t mode) { - int r = 0; - -#ifdef HAVE_SELINUX - security_context_t filecon = NULL; - - if (!use_selinux() || !label_hnd) - return 0; - - r = selabel_lookup_raw(label_hnd, &filecon, path, mode); - if (r < 0 && errno != ENOENT) - r = -errno; - else if (r == 0) { - r = setfscreatecon(filecon); - if (r < 0) { - log_error("Failed to set SELinux file context on %s: %m", path); - r = -errno; - } - - freecon(filecon); - } - - if (r < 0 && security_getenforce() == 0) - r = 0; -#endif - - return r; -} - -int label_socket_set(const char *label) { - -#ifdef HAVE_SELINUX - if (!use_selinux()) - return 0; - - if (setsockcreatecon((security_context_t) label) < 0) { - log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, - "Failed to set SELinux context (%s) on socket: %m", label); - - if (security_getenforce() == 1) - return -errno; - } -#endif - - return 0; -} - -void label_context_clear(void) { - -#ifdef HAVE_SELINUX - PROTECT_ERRNO; - - if (!use_selinux()) - return; - - setfscreatecon(NULL); -#endif -} - -void label_socket_clear(void) { - -#ifdef HAVE_SELINUX - PROTECT_ERRNO; - - if (!use_selinux()) - return; - - setsockcreatecon(NULL); -#endif -} - -void label_free(const char *label) { - -#ifdef HAVE_SELINUX - if (!use_selinux()) - return; - - freecon((security_context_t) label); -#endif -} - -static int label_mkdir_selinux(const char *path, mode_t mode) { - int r = 0; - -#ifdef HAVE_SELINUX - /* Creates a directory and labels it according to the SELinux policy */ - security_context_t fcon = NULL; - - if (!label_hnd) - return 0; - - if (path_is_absolute(path)) - r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR); - else { - _cleanup_free_ char *newpath; - - newpath = path_make_absolute_cwd(path); - if (!newpath) - return -ENOMEM; - - r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR); - } - - if (r == 0) - r = setfscreatecon(fcon); - - if (r < 0 && errno != ENOENT) { - log_error("Failed to set security context %s for %s: %m", fcon, path); - - if (security_getenforce() == 1) { - r = -errno; - goto finish; - } - } - - r = mkdir(path, mode); - if (r < 0) - r = -errno; - -finish: - setfscreatecon(NULL); - freecon(fcon); -#endif - - return r; -} - -int label_mkdir(const char *path, mode_t mode) { - int r; - - if (use_selinux()) { - r = label_mkdir_selinux(path, mode); - if (r < 0) - return r; - } - - if (use_smack()) { - r = mkdir(path, mode); - if (r < 0 && errno != EEXIST) - return -errno; - - r = smack_relabel_in_dev(path); - if (r < 0) - return r; - } - - r = mkdir(path, mode); - if (r < 0 && errno != EEXIST) - return -errno; - - return 0; -} - -int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { - - /* Binds a socket and label its file system object according to the SELinux policy */ - -#ifdef HAVE_SELINUX - security_context_t fcon = NULL; - const struct sockaddr_un *un; - char *path; - int r; - - assert(fd >= 0); - assert(addr); - assert(addrlen >= sizeof(sa_family_t)); - - if (!use_selinux() || !label_hnd) - goto skipped; - - /* Filter out non-local sockets */ - if (addr->sa_family != AF_UNIX) - goto skipped; - - /* Filter out anonymous sockets */ - if (addrlen < sizeof(sa_family_t) + 1) - goto skipped; - - /* Filter out abstract namespace sockets */ - un = (const struct sockaddr_un*) addr; - if (un->sun_path[0] == 0) - goto skipped; - - path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); - - if (path_is_absolute(path)) - r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK); - else { - _cleanup_free_ char *newpath; - - newpath = path_make_absolute_cwd(path); - if (!newpath) - return -ENOMEM; - - r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); - } - - if (r == 0) - r = setfscreatecon(fcon); - - if (r < 0 && errno != ENOENT) { - log_error("Failed to set security context %s for %s: %m", fcon, path); - - if (security_getenforce() == 1) { - r = -errno; - goto finish; - } - } - - r = bind(fd, addr, addrlen); - if (r < 0) - r = -errno; - -finish: - setfscreatecon(NULL); - freecon(fcon); - - return r; - -skipped: -#endif - return bind(fd, addr, addrlen) < 0 ? -errno : 0; -} - -int label_apply(const char *path, const char *label) { - int r = 0; - -#ifdef HAVE_SELINUX - if (!use_selinux()) - return 0; - - r = setfilecon(path, (char *)label); -#endif - return r; -} diff --git a/src/shared/label.h b/src/shared/label.h index ce1e5c3f57..1859f843dc 100644 --- a/src/shared/label.h +++ b/src/shared/label.h @@ -21,34 +21,7 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ -#include <sys/types.h> -#include <stdbool.h> -#include <sys/socket.h> -#include <stdio.h> - -int label_init(const char *prefix); -void label_finish(void); +#include "selinux-util.h" +#include "smack-util.h" int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs); - -int label_socket_set(const char *label); -void label_socket_clear(void); - -int label_context_set(const char *path, mode_t mode); -void label_context_clear(void); - -void label_free(const char *label); - -int label_get_create_label_from_exe(const char *exe, char **label); -int label_get_our_label(char **label); -int label_get_child_mls_label(int socket_fd, const char *exec, char **label); - -int label_mkdir(const char *path, mode_t mode); - -int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen); - -int label_apply(const char *path, const char *label); - -int label_write_one_line_file_atomic(const char *fn, const char *line); -int label_write_env_file(const char *fname, char **l); -int label_fopen_temporary(const char *path, FILE **_f, char **_temp_path); diff --git a/src/shared/mkdir-label.c b/src/shared/mkdir-label.c index 43ea2c25b7..c41045e5b5 100644 --- a/src/shared/mkdir-label.c +++ b/src/shared/mkdir-label.c @@ -32,6 +32,32 @@ #include "path-util.h" #include "mkdir.h" +static int label_mkdir(const char *path, mode_t mode) { + int r; + + if (use_selinux()) { + r = label_mkdir_selinux(path, mode); + if (r < 0) + return r; + } + + if (use_smack()) { + r = mkdir(path, mode); + if (r < 0 && errno != EEXIST) + return -errno; + + r = smack_relabel_in_dev(path); + if (r < 0) + return r; + } + + r = mkdir(path, mode); + if (r < 0 && errno != EEXIST) + return -errno; + + return 0; +} + int mkdir_label(const char *path, mode_t mode) { return label_mkdir(path, mode); } diff --git a/src/shared/mkdir.h b/src/shared/mkdir.h index ca38d211bd..1586214a1e 100644 --- a/src/shared/mkdir.h +++ b/src/shared/mkdir.h @@ -29,7 +29,7 @@ int mkdir_safe(const char *path, mode_t mode, uid_t uid, gid_t gid); int mkdir_parents(const char *path, mode_t mode); int mkdir_p(const char *path, mode_t mode); -/* selinux versions */ +/* mandatory access control(MAC) versions */ int mkdir_label(const char *path, mode_t mode); int mkdir_safe_label(const char *path, mode_t mode, uid_t uid, gid_t gid); int mkdir_parents_label(const char *path, mode_t mode); diff --git a/src/shared/selinux-util.c b/src/shared/selinux-util.c index 026ae5a9e8..05ed61c6dc 100644 --- a/src/shared/selinux-util.c +++ b/src/shared/selinux-util.c @@ -19,33 +19,502 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ +#include <errno.h> +#include <unistd.h> +#include <malloc.h> +#include <sys/un.h> +#ifdef HAVE_SELINUX +#include <selinux/selinux.h> +#include <selinux/label.h> +#include <selinux/context.h> +#endif + +#include "strv.h" +#include "path-util.h" #include "selinux-util.h" #ifdef HAVE_SELINUX +DEFINE_TRIVIAL_CLEANUP_FUNC(security_context_t, freecon); +DEFINE_TRIVIAL_CLEANUP_FUNC(context_t, context_free); -#include <selinux/selinux.h> +#define _cleanup_security_context_free_ _cleanup_(freeconp) +#define _cleanup_context_free_ _cleanup_(context_freep) static int use_selinux_cached = -1; +static struct selabel_handle *label_hnd = NULL; +#endif bool use_selinux(void) { - +#ifdef HAVE_SELINUX if (use_selinux_cached < 0) use_selinux_cached = is_selinux_enabled() > 0; return use_selinux_cached; +#else + return false; +#endif } void retest_selinux(void) { +#ifdef HAVE_SELINUX use_selinux_cached = -1; +#endif } -#else +int label_init(const char *prefix) { + int r = 0; -bool use_selinux(void) { - return false; +#ifdef HAVE_SELINUX + usec_t before_timestamp, after_timestamp; + struct mallinfo before_mallinfo, after_mallinfo; + + if (!use_selinux()) + return 0; + + if (label_hnd) + return 0; + + before_mallinfo = mallinfo(); + before_timestamp = now(CLOCK_MONOTONIC); + + if (prefix) { + struct selinux_opt options[] = { + { .type = SELABEL_OPT_SUBSET, .value = prefix }, + }; + + label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options)); + } else + label_hnd = selabel_open(SELABEL_CTX_FILE, NULL, 0); + + if (!label_hnd) { + log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, + "Failed to initialize SELinux context: %m"); + r = security_getenforce() == 1 ? -errno : 0; + } else { + char timespan[FORMAT_TIMESPAN_MAX]; + int l; + + after_timestamp = now(CLOCK_MONOTONIC); + after_mallinfo = mallinfo(); + + l = after_mallinfo.uordblks > before_mallinfo.uordblks ? after_mallinfo.uordblks - before_mallinfo.uordblks : 0; + + log_debug("Successfully loaded SELinux database in %s, size on heap is %iK.", + format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0), + (l+1023)/1024); + } +#endif + + return r; } -void retest_selinux(void) { +int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs) { + int r = 0; + +#ifdef HAVE_SELINUX + struct stat st; + security_context_t fcon; + + if (!label_hnd) + return 0; + + r = lstat(path, &st); + if (r == 0) { + r = selabel_lookup_raw(label_hnd, &fcon, path, st.st_mode); + + /* If there's no label to set, then exit without warning */ + if (r < 0 && errno == ENOENT) + return 0; + + if (r == 0) { + r = lsetfilecon(path, fcon); + freecon(fcon); + + /* If the FS doesn't support labels, then exit without warning */ + if (r < 0 && errno == ENOTSUP) + return 0; + } + } + + if (r < 0) { + /* Ignore ENOENT in some cases */ + if (ignore_enoent && errno == ENOENT) + return 0; + + if (ignore_erofs && errno == EROFS) + return 0; + + log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, + "Unable to fix label of %s: %m", path); + r = security_getenforce() == 1 ? -errno : 0; + } +#endif + + return r; +} + +void label_finish(void) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return; + + if (label_hnd) + selabel_close(label_hnd); +#endif } +int label_get_create_label_from_exe(const char *exe, char **label) { + + int r = 0; + +#ifdef HAVE_SELINUX + security_context_t mycon = NULL, fcon = NULL; + security_class_t sclass; + + if (!use_selinux()) { + *label = NULL; + return 0; + } + + r = getcon(&mycon); + if (r < 0) + goto fail; + + r = getfilecon(exe, &fcon); + if (r < 0) + goto fail; + + sclass = string_to_security_class("process"); + r = security_compute_create(mycon, fcon, sclass, (security_context_t *) label); + if (r == 0) + log_debug("SELinux Socket context for %s will be set to %s", exe, *label); + +fail: + if (r < 0 && security_getenforce() == 1) + r = -errno; + + freecon(mycon); + freecon(fcon); +#endif + + return r; +} + +int label_get_our_label(char **label) { + int r = -EOPNOTSUPP; + +#ifdef HAVE_SELINUX + char *l = NULL; + + r = getcon(&l); + if (r < 0) + return r; + + *label = l; #endif + + return r; +} + +int label_get_child_mls_label(int socket_fd, const char *exe, char **label) { + int r = -EOPNOTSUPP; + +#ifdef HAVE_SELINUX + + _cleanup_security_context_free_ security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = NULL; + _cleanup_context_free_ context_t pcon = NULL, bcon = NULL; + security_class_t sclass; + + const char *range = NULL; + + assert(socket_fd >= 0); + assert(exe); + assert(label); + + r = getcon(&mycon); + if (r < 0) { + r = -EINVAL; + goto out; + } + + r = getpeercon(socket_fd, &peercon); + if (r < 0) { + r = -EINVAL; + goto out; + } + + r = getexeccon(&fcon); + if (r < 0) { + r = -EINVAL; + goto out; + } + + if (!fcon) { + /* If there is no context set for next exec let's use context + of target executable */ + r = getfilecon(exe, &fcon); + if (r < 0) { + r = -errno; + goto out; + } + } + + bcon = context_new(mycon); + if (!bcon) { + r = -ENOMEM; + goto out; + } + + pcon = context_new(peercon); + if (!pcon) { + r = -ENOMEM; + goto out; + } + + range = context_range_get(pcon); + if (!range) { + r = -errno; + goto out; + } + + r = context_range_set(bcon, range); + if (r) { + r = -errno; + goto out; + } + + freecon(mycon); + mycon = strdup(context_str(bcon)); + if (!mycon) { + r = -errno; + goto out; + } + + sclass = string_to_security_class("process"); + r = security_compute_create(mycon, fcon, sclass, &ret); + if (r < 0) { + r = -EINVAL; + goto out; + } + + *label = ret; + ret = NULL; + r = 0; + +out: + if (r < 0 && security_getenforce() == 1) + return r; +#endif + return r; +} + +int label_context_set(const char *path, mode_t mode) { + int r = 0; + +#ifdef HAVE_SELINUX + security_context_t filecon = NULL; + + if (!use_selinux() || !label_hnd) + return 0; + + r = selabel_lookup_raw(label_hnd, &filecon, path, mode); + if (r < 0 && errno != ENOENT) + r = -errno; + else if (r == 0) { + r = setfscreatecon(filecon); + if (r < 0) { + log_error("Failed to set SELinux file context on %s: %m", path); + r = -errno; + } + + freecon(filecon); + } + + if (r < 0 && security_getenforce() == 0) + r = 0; +#endif + + return r; +} + +int label_socket_set(const char *label) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return 0; + + if (setsockcreatecon((security_context_t) label) < 0) { + log_full(security_getenforce() == 1 ? LOG_ERR : LOG_DEBUG, + "Failed to set SELinux context (%s) on socket: %m", label); + + if (security_getenforce() == 1) + return -errno; + } +#endif + + return 0; +} + +void label_context_clear(void) { + +#ifdef HAVE_SELINUX + PROTECT_ERRNO; + + if (!use_selinux()) + return; + + setfscreatecon(NULL); +#endif +} + +void label_socket_clear(void) { + +#ifdef HAVE_SELINUX + PROTECT_ERRNO; + + if (!use_selinux()) + return; + + setsockcreatecon(NULL); +#endif +} + +void label_free(const char *label) { + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return; + + freecon((security_context_t) label); +#endif +} + +int label_mkdir_selinux(const char *path, mode_t mode) { + int r = 0; + +#ifdef HAVE_SELINUX + /* Creates a directory and labels it according to the SELinux policy */ + security_context_t fcon = NULL; + + if (!label_hnd) + return 0; + + if (path_is_absolute(path)) + r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR); + else { + _cleanup_free_ char *newpath; + + newpath = path_make_absolute_cwd(path); + if (!newpath) + return -ENOMEM; + + r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR); + } + + if (r == 0) + r = setfscreatecon(fcon); + + if (r < 0 && errno != ENOENT) { + log_error("Failed to set security context %s for %s: %m", fcon, path); + + if (security_getenforce() == 1) { + r = -errno; + goto finish; + } + } + + r = mkdir(path, mode); + if (r < 0) + r = -errno; + +finish: + setfscreatecon(NULL); + freecon(fcon); +#endif + + return r; +} + +int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { + + /* Binds a socket and label its file system object according to the SELinux policy */ + +#ifdef HAVE_SELINUX + security_context_t fcon = NULL; + const struct sockaddr_un *un; + char *path; + int r; + + assert(fd >= 0); + assert(addr); + assert(addrlen >= sizeof(sa_family_t)); + + if (!use_selinux() || !label_hnd) + goto skipped; + + /* Filter out non-local sockets */ + if (addr->sa_family != AF_UNIX) + goto skipped; + + /* Filter out anonymous sockets */ + if (addrlen < sizeof(sa_family_t) + 1) + goto skipped; + + /* Filter out abstract namespace sockets */ + un = (const struct sockaddr_un*) addr; + if (un->sun_path[0] == 0) + goto skipped; + + path = strndupa(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); + + if (path_is_absolute(path)) + r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK); + else { + _cleanup_free_ char *newpath; + + newpath = path_make_absolute_cwd(path); + if (!newpath) + return -ENOMEM; + + r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); + } + + if (r == 0) + r = setfscreatecon(fcon); + + if (r < 0 && errno != ENOENT) { + log_error("Failed to set security context %s for %s: %m", fcon, path); + + if (security_getenforce() == 1) { + r = -errno; + goto finish; + } + } + + r = bind(fd, addr, addrlen); + if (r < 0) + r = -errno; + +finish: + setfscreatecon(NULL); + freecon(fcon); + + return r; + +skipped: +#endif + return bind(fd, addr, addrlen) < 0 ? -errno : 0; +} + +int label_apply(const char *path, const char *label) { + int r = 0; + +#ifdef HAVE_SELINUX + if (!use_selinux()) + return 0; + + r = setfilecon(path, (char *)label); +#endif + return r; +} diff --git a/src/shared/selinux-util.h b/src/shared/selinux-util.h index 4b81202741..bdde8f5a24 100644 --- a/src/shared/selinux-util.h +++ b/src/shared/selinux-util.h @@ -21,7 +21,34 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ +#include <sys/socket.h> +#include <stdio.h> #include <stdbool.h> bool use_selinux(void); void retest_selinux(void); + +int label_init(const char *prefix); +int label_fix_selinux(const char *path, bool ignore_enoent, bool ignore_erofs); +void label_finish(void); + +int label_socket_set(const char *label); +void label_socket_clear(void); + +int label_context_set(const char *path, mode_t mode); +void label_context_clear(void); + +void label_free(const char *label); +int label_mkdir_selinux(const char *path, mode_t mode); + +int label_get_create_label_from_exe(const char *exe, char **label); +int label_get_our_label(char **label); +int label_get_child_mls_label(int socket_fd, const char *exec, char **label); + +int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen); + +int label_apply(const char *path, const char *label); + +int label_write_one_line_file_atomic(const char *fn, const char *line); +int label_write_env_file(const char *fname, char **l); +int label_fopen_temporary(const char *path, FILE **_f, char **_temp_path); diff --git a/src/shared/smack-util.c b/src/shared/smack-util.c index 8f83562bf6..04ee217d2f 100644 --- a/src/shared/smack-util.c +++ b/src/shared/smack-util.c @@ -21,10 +21,10 @@ along with systemd; If not, see <http://www.gnu.org/licenses/>. ***/ -#include <unistd.h> -#include <string.h> #include <sys/xattr.h> +#include "util.h" +#include "path-util.h" #include "smack-util.h" bool use_smack(void) { @@ -87,3 +87,44 @@ int smack_label_ip_in_fd(int fd, const char *label) { return 0; #endif } + +int smack_relabel_in_dev(const char *path) { + int r = 0; + +#ifdef HAVE_SMACK + struct stat sb; + const char *label; + + /* + * Path must be in /dev and must exist + */ + if (!path_startswith(path, "/dev")) + return 0; + + r = lstat(path, &sb); + if (r < 0) + return -errno; + + /* + * Label directories and character devices "*". + * Label symlinks "_". + * Don't change anything else. + */ + if (S_ISDIR(sb.st_mode)) + label = SMACK_STAR_LABEL; + else if (S_ISLNK(sb.st_mode)) + label = SMACK_FLOOR_LABEL; + else if (S_ISCHR(sb.st_mode)) + label = SMACK_STAR_LABEL; + else + return 0; + + r = setxattr(path, "security.SMACK64", label, strlen(label), 0); + if (r < 0) { + log_error("Smack relabeling \"%s\" %m", path); + return -errno; + } +#endif + + return r; +} diff --git a/src/shared/smack-util.h b/src/shared/smack-util.h index 7370ae32b3..87d64346ba 100644 --- a/src/shared/smack-util.h +++ b/src/shared/smack-util.h @@ -34,3 +34,4 @@ int smack_label_path(const char *path, const char *label); int smack_label_fd(int fd, const char *label); int smack_label_ip_in_fd(int fd, const char *label); int smack_label_ip_out_fd(int fd, const char *label); +int smack_relabel_in_dev(const char *path); |