X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fshared%2Flabel.c;h=25a8b361b7c9c86e23139976e16acc910f717342;hp=e13eba65501ef7f0264a96a9643b217c6aca816c;hb=3bb07b7680c543c982077ac075abe8badeb46ca1;hpb=107a2db901d93ffaba4a2fe34e6b28643b96574f diff --git a/src/shared/label.c b/src/shared/label.c index e13eba655..25a8b361b 100644 --- a/src/shared/label.c +++ b/src/shared/label.c @@ -20,38 +20,71 @@ ***/ #include -#include #include #include #include #include +#include +#include +#include +#include +#ifdef HAVE_SELINUX +#include +#include +#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 -#include -#include - static struct selabel_handle *label_hnd = NULL; +#endif -static int use_selinux_cached = -1; - -static inline bool use_selinux(void) { +static int smack_relabel_in_dev(const char *path) { + int r = 0; - if (use_selinux_cached < 0) - use_selinux_cached = is_selinux_enabled() > 0; +#ifdef HAVE_SMACK + struct stat sb; + const char *label; - return use_selinux_cached; -} + /* + * Path must be in /dev and must exist + */ + if (!path_startswith(path, "/dev")) + return 0; -void label_retest_selinux(void) { - use_selinux_cached = -1; -} + 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; @@ -91,7 +124,7 @@ int label_init(const char *prefix) { 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), + format_timespan(timespan, sizeof(timespan), after_timestamp - before_timestamp, 0), (l+1023)/1024); } #endif @@ -99,14 +132,14 @@ int label_init(const char *prefix) { return r; } -int label_fix(const char *path, bool ignore_enoent) { +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 (!use_selinux() || !label_hnd) + if (!label_hnd) return 0; r = lstat(path, &st); @@ -132,6 +165,9 @@ int label_fix(const char *path, bool ignore_enoent) { 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; @@ -141,10 +177,31 @@ int label_fix(const char *path, bool ignore_enoent) { return r; } +int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { + int r = 0; + + if (use_selinux()) { + r = label_fix_selinux(path, ignore_enoent, ignore_erofs); + if (r < 0) + return r; + } + + if (use_smack()) { + r = smack_relabel_in_dev(path); + if (r < 0) + return r; + } + + return r; +} + void label_finish(void) { #ifdef HAVE_SELINUX - if (use_selinux() && label_hnd) + if (!use_selinux()) + return; + + if (label_hnd) selabel_close(label_hnd); #endif } @@ -196,7 +253,7 @@ int label_context_set(const char *path, mode_t mode) { return 0; r = selabel_lookup_raw(label_hnd, &filecon, path, mode); - if (r < 0) + if (r < 0 && errno != ENOENT) r = -errno; else if (r == 0) { r = setfscreatecon(filecon); @@ -236,6 +293,8 @@ int label_socket_set(const char *label) { void label_context_clear(void) { #ifdef HAVE_SELINUX + PROTECT_ERRNO; + if (!use_selinux()) return; @@ -246,6 +305,8 @@ void label_context_clear(void) { void label_socket_clear(void) { #ifdef HAVE_SELINUX + PROTECT_ERRNO; + if (!use_selinux()) return; @@ -263,28 +324,26 @@ void label_free(const char *label) { #endif } -int label_mkdir(const char *path, mode_t mode) { - - /* Creates a directory and labels it according to the SELinux policy */ +static int label_mkdir_selinux(const char *path, mode_t mode) { + int r = 0; #ifdef HAVE_SELINUX - int r; + /* Creates a directory and labels it according to the SELinux policy */ security_context_t fcon = NULL; - if (!use_selinux() || !label_hnd) - goto skipped; + if (!label_hnd) + return 0; if (path_is_absolute(path)) r = selabel_lookup_raw(label_hnd, &fcon, path, S_IFDIR); else { - char *newpath; + _cleanup_free_ char *newpath; newpath = path_make_absolute_cwd(path); if (!newpath) return -ENOMEM; r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFDIR); - free(newpath); } if (r == 0) @@ -306,12 +365,35 @@ int label_mkdir(const char *path, mode_t mode) { finish: setfscreatecon(NULL); freecon(fcon); +#endif return r; +} -skipped: -#endif - return mkdir(path, mode) < 0 ? -errno : 0; +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) { @@ -319,10 +401,10 @@ 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 - int r; security_context_t fcon = NULL; const struct sockaddr_un *un; - char *path = NULL; + char *path; + int r; assert(fd >= 0); assert(addr); @@ -344,24 +426,18 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { if (un->sun_path[0] == 0) goto skipped; - path = strndup(un->sun_path, addrlen - offsetof(struct sockaddr_un, sun_path)); - if (!path) - return -ENOMEM; + 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 { - char *newpath; + _cleanup_free_ char *newpath; newpath = path_make_absolute_cwd(path); - - if (!newpath) { - free(path); + if (!newpath) return -ENOMEM; - } r = selabel_lookup_raw(label_hnd, &fcon, newpath, S_IFSOCK); - free(newpath); } if (r == 0) @@ -383,7 +459,6 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { finish: setfscreatecon(NULL); freecon(fcon); - free(path); return r; @@ -391,3 +466,15 @@ 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; +}