X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?a=blobdiff_plain;f=src%2Fshared%2Flabel.c;h=dd89bec6e89a5aa7738d9f7cc76550df35030e5c;hb=cf8bd44339b00330fdbc91041d6731ba8aba9fec;hp=a8bf6bd4f93982ce46ba83edc28b982d01693def;hpb=a5c32cff1f56afe6f0c6c70d91a88a7a8238b2d7;p=elogind.git diff --git a/src/shared/label.c b/src/shared/label.c index a8bf6bd4f..dd89bec6e 100644 --- a/src/shared/label.c +++ b/src/shared/label.c @@ -20,7 +20,6 @@ ***/ #include -#include #include #include #include @@ -28,21 +27,65 @@ #include #include #include +#include +#ifdef HAVE_SELINUX +#include +#include +#include +#endif #include "label.h" #include "strv.h" #include "util.h" #include "path-util.h" - -#ifdef HAVE_SELINUX #include "selinux-util.h" -#include -#include +#include "smack-util.h" +#ifdef HAVE_SELINUX 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; @@ -82,7 +125,7 @@ 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 @@ -90,14 +133,14 @@ int label_init(const char *prefix) { return r; } -int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { +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); @@ -135,10 +178,31 @@ int label_fix(const char *path, bool ignore_enoent, bool ignore_erofs) { 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 } @@ -180,6 +244,74 @@ fail: return r; } +int label_get_child_label(int socket_fd, const char *exe, char **label) { + int r = 0; + +#ifdef HAVE_SELINUX + + security_context_t mycon = NULL, peercon = NULL, fcon = NULL, ret = NULL; + security_class_t sclass; + context_t pcon = NULL, bcon = NULL; + const char *range = NULL; + + assert(socket_fd >= 0); + assert(exe); + assert(label); + + r = getcon(&mycon); + if (r < 0) + goto out; + + r = getpeercon(socket_fd, &peercon); + if (r < 0) + goto out; + + r = getfilecon(exe, &fcon); + if (r < 0) + goto out; + + bcon = context_new(mycon); + if (!bcon) + goto out; + + pcon = context_new(peercon); + if (!pcon) + goto out; + + range = context_range_get(pcon); + if (!range) + goto out; + + r = context_range_set(bcon, range); + if (r) + goto out; + + freecon(mycon); + mycon = context_str(bcon); + if (!mycon) + goto out; + + sclass = string_to_security_class("process"); + r = security_compute_create(mycon, fcon, sclass, &ret); + if (r < 0) + goto out; + + *label = ret; + +out: + if (r && security_getenforce() == 1) + r = -errno; + + freecon(mycon); + freecon(peercon); + freecon(fcon); + context_free(pcon); + context_free(bcon); + +#endif + return r; +} + int label_context_set(const char *path, mode_t mode) { int r = 0; @@ -230,6 +362,8 @@ int label_socket_set(const char *label) { void label_context_clear(void) { #ifdef HAVE_SELINUX + PROTECT_ERRNO; + if (!use_selinux()) return; @@ -240,6 +374,8 @@ void label_context_clear(void) { void label_socket_clear(void) { #ifdef HAVE_SELINUX + PROTECT_ERRNO; + if (!use_selinux()) return; @@ -257,27 +393,26 @@ void label_free(const char *label) { #endif } -int label_mkdir(const char *path, mode_t mode, bool apply) { +static int label_mkdir_selinux(const char *path, mode_t mode) { + int r = 0; - /* 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) - 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) @@ -299,12 +434,35 @@ int label_mkdir(const char *path, mode_t mode, bool apply) { 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) { @@ -312,10 +470,10 @@ 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); @@ -337,24 +495,18 @@ 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) @@ -376,7 +528,6 @@ int label_bind(int fd, const struct sockaddr *addr, socklen_t addrlen) { finish: setfscreatecon(NULL); freecon(fcon); - free(path); return r; @@ -384,3 +535,15 @@ 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; +}