X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Flabel.c;h=70e5c85a11273833837b30fc7faea6fffa752d73;hb=76cf10dab7a36653a159f0e87c46a13df494474f;hp=3e5ea6746957ed7482bdb5b806aa4670fb2d60a6;hpb=9b5af248f04b6cad8a5bca836e89a39e9f6823d9;p=elogind.git diff --git a/src/shared/label.c b/src/shared/label.c index 3e5ea6746..70e5c85a1 100644 --- a/src/shared/label.c +++ b/src/shared/label.c @@ -20,39 +20,74 @@ ***/ #include -#include #include #include #include #include +#include +#include +#include +#ifdef HAVE_XATTR +#include +#endif +#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\" %s", path, strerror(errno)); + return -errno; + } #endif -int label_init(const char *prefixes[]) { + return r; +} + +int label_init(const char *prefix) { int r = 0; #ifdef HAVE_SELINUX @@ -68,9 +103,9 @@ int label_init(const char *prefixes[]) { before_mallinfo = mallinfo(); before_timestamp = now(CLOCK_MONOTONIC); - if (prefixes) { + if (prefix) { struct selinux_opt options[] = { - { .type = SELABEL_OPT_SUBSET, .values = prefixes }, + { .type = SELABEL_OPT_SUBSET, .value = prefix }, }; label_hnd = selabel_open(SELABEL_CTX_FILE, options, ELEMENTSOF(options)); @@ -91,7 +126,7 @@ int label_init(const char *prefixes[]) { 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 +134,14 @@ int label_init(const char *prefixes[]) { 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 +167,9 @@ 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 +179,31 @@ 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 +255,7 @@ 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); @@ -263,28 +322,26 @@ 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 +363,35 @@ 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 +399,10 @@ 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 +424,18 @@ 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 +457,6 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { finish: setfscreatecon(NULL); freecon(fcon); - free(path); return r; @@ -391,3 +464,15 @@ 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; +}