X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Flabel.c;h=3632e3ebf9fbd617c3cb91e23a598be76a2a3b77;hb=2453d7e447057f2652114c1822bfc8c5600236fe;hp=2062fc316c5dc52c4366d7a8868d6362d65820f1;hpb=cad45ba11ec3572296361f53f5852ffb97a97fa3;p=elogind.git diff --git a/src/shared/label.c b/src/shared/label.c index 2062fc316..3632e3ebf 100644 --- a/src/shared/label.c +++ b/src/shared/label.c @@ -20,13 +20,16 @@ ***/ #include -#include #include #include #include #include +#include +#include +#include #include "label.h" +#include "strv.h" #include "util.h" #include "path-util.h" @@ -37,6 +40,48 @@ static struct selabel_handle *label_hnd = NULL; +#endif +#ifdef HAVE_SMACK +#include +#include +#define FLOOR_LABEL "_" +#define STAR_LABEL "*" + +static void smack_relabel_in_dev(const char *path) { + struct stat sb; + const char *label; + int r; + + /* + * Path must be in /dev and must exist + */ + if (!path_equal(path, "/dev") && + !path_startswith(path, "/dev")) + return; + + r = lstat(path, &sb); + if (r < 0) + return; + + /* + * Label directories and character devices "*". + * Label symlinks "_". + * Don't change anything else. + */ + if (S_ISDIR(sb.st_mode)) + label = STAR_LABEL; + else if (S_ISLNK(sb.st_mode)) + label = FLOOR_LABEL; + else if (S_ISCHR(sb.st_mode)) + label = STAR_LABEL; + else + return; + + r = setxattr(path, "security.SMACK64", label, strlen(label), 0); + if (r < 0) + log_error("Smack relabeling \"%s\" %s", path, strerror(errno)); + return; +} #endif int label_init(const char *prefix) { @@ -78,7 +123,7 @@ 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 @@ -127,6 +172,9 @@ int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { r = security_getenforce() == 1 ? -errno : 0; } #endif +#ifdef HAVE_SMACK + smack_relabel_in_dev(path); +#endif return r; } @@ -134,7 +182,10 @@ int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { void label_finish(void) { #ifdef HAVE_SELINUX - if (use_selinux() && label_hnd) + if (!use_selinux()) + return; + + if (label_hnd) selabel_close(label_hnd); #endif } @@ -186,7 +237,7 @@ 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); @@ -201,6 +252,9 @@ int label_context_set(const char *path, mode_t mode) { if (r < 0 && security_getenforce() == 0) r = 0; #endif +#ifdef HAVE_SMACK + smack_relabel_in_dev(path); +#endif return r; } @@ -253,27 +307,26 @@ void label_free(const char *label) { #endif } -int label_mkdir(const char *path, mode_t mode, bool apply) { +int label_mkdir(const char *path, mode_t mode) { + int r; - /* Creates a directory and labels it according to the SELinux policy */ #ifdef HAVE_SELINUX - int r; + /* Creates a directory and labels it according to the SELinux policy */ security_context_t fcon = NULL; - if (!apply || !use_selinux() || !label_hnd) + if (!use_selinux() || !label_hnd) goto skipped; 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) @@ -300,7 +353,13 @@ finish: skipped: #endif - return mkdir(path, mode) < 0 ? -errno : 0; + r = mkdir(path, mode); + if (r) + return -errno; +#ifdef HAVE_SMACK + smack_relabel_in_dev(path); +#endif + return 0; } int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { @@ -308,10 +367,10 @@ 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); @@ -333,24 +392,18 @@ 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) @@ -372,7 +425,6 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { finish: setfscreatecon(NULL); freecon(fcon); - free(path); return r; @@ -380,3 +432,15 @@ 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; +}