X-Git-Url: http://www.chiark.greenend.org.uk/ucgi/~ianmdlvl/git?p=elogind.git;a=blobdiff_plain;f=src%2Fudev%2Fudev-node.c;h=0429c35ff7fc1a2b1a0a9e7f8d053e5356995d90;hp=3eec14021b7d6b2d13a725d3154970b3a5807007;hb=486cd82c8f7642016895b72bcc09a1bfe885a783;hpb=d5a89d7dc17a5ba5cf4fc71f82963c5c94a31c3d diff --git a/src/udev/udev-node.c b/src/udev/udev-node.c index 3eec14021..0429c35ff 100644 --- a/src/udev/udev-node.c +++ b/src/udev/udev-node.c @@ -1,5 +1,5 @@ /* - * Copyright (C) 2003-2010 Kay Sievers + * Copyright (C) 2003-2013 Kay Sievers * * This program is free software: you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -30,16 +30,15 @@ #include #include "udev.h" +#include "smack-util.h" -#define TMP_FILE_EXT ".udev-tmp" - -static int node_symlink(struct udev *udev, const char *node, const char *slink) +static int node_symlink(struct udev_device *dev, const char *node, const char *slink) { struct stat stats; char target[UTIL_PATH_SIZE]; char *s; size_t l; - char slink_tmp[UTIL_PATH_SIZE + sizeof(TMP_FILE_EXT)]; + char slink_tmp[UTIL_PATH_SIZE + 32]; int i = 0; int tail = 0; int err = 0; @@ -76,7 +75,7 @@ static int node_symlink(struct udev *udev, const char *node, const char *slink) len = readlink(slink, buf, sizeof(buf)); if (len > 0 && len < (int)sizeof(buf)) { buf[len] = '\0'; - if (strcmp(target, buf) == 0) { + if (streq(target, buf)) { log_debug("preserve already existing symlink '%s' to '%s'\n", slink, target); label_fix(slink, true, false); utimensat(AT_FDCWD, slink, NULL, AT_SYMLINK_NOFOLLOW); @@ -101,7 +100,7 @@ static int node_symlink(struct udev *udev, const char *node, const char *slink) } log_debug("atomically replace '%s'\n", slink); - strscpyl(slink_tmp, sizeof(slink_tmp), slink, TMP_FILE_EXT, NULL); + strscpyl(slink_tmp, sizeof(slink_tmp), slink, ".tmp-", udev_device_get_id_filename(dev), NULL); unlink(slink_tmp); do { err = mkdir_parents_label(slink_tmp, 0755); @@ -156,7 +155,7 @@ static const char *link_find_prioritized(struct udev_device *dev, bool add, cons log_debug("found '%s' claiming '%s'\n", dent->d_name, stackdir); /* did we find ourself? */ - if (strcmp(dent->d_name, udev_device_get_id_filename(dev)) == 0) + if (streq(dent->d_name, udev_device_get_id_filename(dev))) continue; dev_db = udev_device_new_from_device_id(udev, dent->d_name); @@ -204,7 +203,7 @@ static void link_update(struct udev_device *dev, const char *slink, bool add) util_delete_path(udev, slink); } else { log_debug("creating link '%s' to '%s'\n", slink, target); - node_symlink(udev, target, slink); + node_symlink(dev, target, slink); } if (add) { @@ -240,7 +239,7 @@ void udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev udev_list_entry_foreach(list_entry_current, udev_device_get_devlinks_list_entry(dev)) { const char *name_current = udev_list_entry_get_name(list_entry_current); - if (strcmp(name, name_current) == 0) { + if (streq(name, name_current)) { found = 1; break; } @@ -254,14 +253,16 @@ void udev_node_update_old_links(struct udev_device *dev, struct udev_device *dev } } -static int node_fixup(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid) -{ +static int node_permissions_apply(struct udev_device *dev, bool apply, + mode_t mode, uid_t uid, gid_t gid, + struct udev_list *seclabel_list) { const char *devnode = udev_device_get_devnode(dev); dev_t devnum = udev_device_get_devnum(dev); struct stat stats; + struct udev_list_entry *entry; int err = 0; - if (strcmp(udev_device_get_subsystem(dev), "block") == 0) + if (streq(udev_device_get_subsystem(dev), "block")) mode |= S_IFBLK; else mode |= S_IFCHR; @@ -279,13 +280,10 @@ static int node_fixup(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid goto out; } - /* - * Set permissions and selinux file context only on add events. We always - * set it on bootup (coldplug) with "trigger --action=add" for all devices - * and for any newly added devices (hotplug). We don't want to change it - * later, in case something else has applied custom settings in the meantime. - */ - if (strcmp(udev_device_get_action(dev), "add") == 0) { + if (apply) { + bool selinux = false; + bool smack = false; + if ((stats.st_mode & 0777) != (mode & 0777) || stats.st_uid != uid || stats.st_gid != gid) { log_debug("set permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid); chmod(devnode, mode); @@ -294,7 +292,36 @@ static int node_fixup(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid log_debug("preserve permissions %s, %#o, uid=%u, gid=%u\n", devnode, mode, uid, gid); } - label_fix(devnode, true, false); + /* apply SECLABEL{$module}=$label */ + udev_list_entry_foreach(entry, udev_list_get_entry(seclabel_list)) { + const char *name, *label; + + name = udev_list_entry_get_name(entry); + label = udev_list_entry_get_value(entry); + + if (streq(name, "selinux")) { + selinux = true; + if (label_apply(devnode, label) < 0) + log_error("SECLABEL: failed to set SELinux label '%s'", label); + else + log_debug("SECLABEL: set SELinux label '%s'", label); + + } else if (streq(name, "smack")) { + smack = true; + if (smack_label_path(devnode, label) < 0) + log_error("SECLABEL: failed to set SMACK label '%s'", label); + else + log_debug("SECLABEL: set SMACK label '%s'", label); + + } else + log_error("SECLABEL: unknown subsystem, ignoring '%s'='%s'", name, label); + } + + /* set the defaults */ + if (!selinux) + label_fix(devnode, true, false); + if (!smack) + smack_label_path(devnode, NULL); } /* always update timestamp when we re-use the node, like on media change events */ @@ -303,23 +330,23 @@ out: return err; } -void udev_node_add(struct udev_device *dev, mode_t mode, uid_t uid, gid_t gid) -{ - struct udev *udev = udev_device_get_udev(dev); +void udev_node_add(struct udev_device *dev, bool apply, + mode_t mode, uid_t uid, gid_t gid, + struct udev_list *seclabel_list) { char filename[UTIL_PATH_SIZE]; struct udev_list_entry *list_entry; log_debug("handling device node '%s', devnum=%s, mode=%#o, uid=%d, gid=%d\n", udev_device_get_devnode(dev), udev_device_get_id_filename(dev), mode, uid, gid); - if (node_fixup(dev, mode, uid, gid) < 0) + if (node_permissions_apply(dev, apply, mode, uid, gid, seclabel_list) < 0) return; /* always add /dev/{block,char}/$major:$minor */ snprintf(filename, sizeof(filename), "/dev/%s/%u:%u", - strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char", + streq(udev_device_get_subsystem(dev), "block") ? "block" : "char", major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev))); - node_symlink(udev, udev_device_get_devnode(dev), filename); + node_symlink(dev, udev_device_get_devnode(dev), filename); /* create/update symlinks, add symlinks to name index */ udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(dev)) @@ -337,7 +364,7 @@ void udev_node_remove(struct udev_device *dev) /* remove /dev/{block,char}/$major:$minor */ snprintf(filename, sizeof(filename), "/dev/%s/%u:%u", - strcmp(udev_device_get_subsystem(dev), "block") == 0 ? "block" : "char", + streq(udev_device_get_subsystem(dev), "block") ? "block" : "char", major(udev_device_get_devnum(dev)), minor(udev_device_get_devnum(dev))); unlink(filename); }