--- /dev/null
+/*
+ * NetLabel Unlabeled Support
+ *
+ * This file defines functions for dealing with unlabeled packets for the
+ * NetLabel system. The NetLabel system manages static and dynamic label
+ * mappings for network protocols such as CIPSO and RIPSO.
+ *
+ * Author: Paul Moore <paul.moore@hp.com>
+ *
+ */
+
+/*
+ * (c) Copyright Hewlett-Packard Development Company, L.P., 2006
+ *
+ * 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
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
+ * the GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+#include <linux/list.h>
+#include <linux/spinlock.h>
+#include <linux/socket.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/audit.h>
+#include <net/sock.h>
+#include <net/netlink.h>
+#include <net/genetlink.h>
+
+#include <net/netlabel.h>
+#include <asm/bug.h>
+
+#include "netlabel_user.h"
+#include "netlabel_domainhash.h"
+#include "netlabel_unlabeled.h"
+
+/* Accept unlabeled packets flag */
+static DEFINE_SPINLOCK(netlabel_unlabel_acceptflg_lock);
+static u8 netlabel_unlabel_acceptflg = 0;
+
+/* NetLabel Generic NETLINK CIPSOv4 family */
+static struct genl_family netlbl_unlabel_gnl_family = {
+ .id = GENL_ID_GENERATE,
+ .hdrsize = 0,
+ .name = NETLBL_NLTYPE_UNLABELED_NAME,
+ .version = NETLBL_PROTO_VERSION,
+ .maxattr = NLBL_UNLABEL_A_MAX,
+};
+
+/* NetLabel Netlink attribute policy */
+static struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = {
+ [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 },
+};
+
+/*
+ * Helper Functions
+ */
+
+/**
+ * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag
+ * @value: desired value
+ * @audit_info: NetLabel audit information
+ *
+ * Description:
+ * Set the value of the unlabeled accept flag to @value.
+ *
+ */
+static void netlbl_unlabel_acceptflg_set(u8 value,
+ struct netlbl_audit *audit_info)
+{
+ struct audit_buffer *audit_buf;
+ u8 old_val;
+
+ rcu_read_lock();
+ old_val = netlabel_unlabel_acceptflg;
+ spin_lock(&netlabel_unlabel_acceptflg_lock);
+ netlabel_unlabel_acceptflg = value;
+ spin_unlock(&netlabel_unlabel_acceptflg_lock);
+ rcu_read_unlock();
+
+ audit_buf = netlbl_audit_start_common(AUDIT_MAC_UNLBL_ALLOW,
+ audit_info);
+ if (audit_buf != NULL) {
+ audit_log_format(audit_buf,
+ " unlbl_accept=%u old=%u", value, old_val);
+ audit_log_end(audit_buf);
+ }
+}
+
+/*
+ * NetLabel Command Handlers
+ */
+
+/**
+ * netlbl_unlabel_accept - Handle an ACCEPT message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated ACCEPT message and set the accept flag accordingly.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info)
+{
+ u8 value;
+ struct netlbl_audit audit_info;
+
+ if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) {
+ value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]);
+ if (value == 1 || value == 0) {
+ netlbl_netlink_auditinfo(skb, &audit_info);
+ netlbl_unlabel_acceptflg_set(value, &audit_info);
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+/**
+ * netlbl_unlabel_list - Handle a LIST message
+ * @skb: the NETLINK buffer
+ * @info: the Generic NETLINK info block
+ *
+ * Description:
+ * Process a user generated LIST message and respond with the current status.
+ * Returns zero on success, negative values on failure.
+ *
+ */
+static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info)
+{
+ int ret_val = -EINVAL;
+ struct sk_buff *ans_skb;
+ void *data;
+
+ ans_skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
+ if (ans_skb == NULL)
+ goto list_failure;
+ data = genlmsg_put_reply(ans_skb, info, &netlbl_unlabel_gnl_family,
+ 0, NLBL_UNLABEL_C_LIST);
+ if (data == NULL) {
+ ret_val = -ENOMEM;
+ goto list_failure;
+ }
+
+ rcu_read_lock();
+ ret_val = nla_put_u8(ans_skb,
+ NLBL_UNLABEL_A_ACPTFLG,
+ netlabel_unlabel_acceptflg);
+ rcu_read_unlock();
+ if (ret_val != 0)
+ goto list_failure;
+
+ genlmsg_end(ans_skb, data);
+
+ ret_val = genlmsg_reply(ans_skb, info);
+ if (ret_val != 0)
+ goto list_failure;
+ return 0;
+
+list_failure:
+ kfree(ans_skb);
+ return ret_val;
+}
+
+
+/*
+ * NetLabel Generic NETLINK Command Definitions
+ */
+
+static struct genl_ops netlbl_unlabel_genl_c_accept = {
+ .cmd = NLBL_UNLABEL_C_ACCEPT,
+ .flags = GENL_ADMIN_PERM,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = netlbl_unlabel_accept,
+ .dumpit = NULL,
+};
+
+static struct genl_ops netlbl_unlabel_genl_c_list = {
+ .cmd = NLBL_UNLABEL_C_LIST,
+ .flags = 0,
+ .policy = netlbl_unlabel_genl_policy,
+ .doit = netlbl_unlabel_list,
+ .dumpit = NULL,
+};
+
+
+/*
+ * NetLabel Generic NETLINK Protocol Functions
+ */
+
+/**
+ * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component
+ *
+ * Description:
+ * Register the unlabeled packet NetLabel component with the Generic NETLINK
+ * mechanism. Returns zero on success, negative values on failure.
+ *
+ */
+int netlbl_unlabel_genl_init(void)
+{
+ int ret_val;
+
+ ret_val = genl_register_family(&netlbl_unlabel_gnl_family);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_accept);
+ if (ret_val != 0)
+ return ret_val;
+
+ ret_val = genl_register_ops(&netlbl_unlabel_gnl_family,
+ &netlbl_unlabel_genl_c_list);
+ if (ret_val != 0)
+ return ret_val;
+
+ return 0;
+}
+
+/*
+ * NetLabel KAPI Hooks
+ */
+
+/**
+ * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet
+ * @secattr: the security attributes
+ *
+ * Description:
+ * Determine the security attributes, if any, for an unlabled packet and return
+ * them in @secattr. Returns zero on success and negative values on failure.
+ *
+ */
+int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr)
+{
+ int ret_val;
+
+ rcu_read_lock();
+ if (netlabel_unlabel_acceptflg == 1) {
+ netlbl_secattr_init(secattr);
+ ret_val = 0;
+ } else
+ ret_val = -ENOMSG;
+ rcu_read_unlock();
+
+ return ret_val;
+}
+
+/**
+ * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets
+ *
+ * Description:
+ * Set the default NetLabel configuration to allow incoming unlabeled packets
+ * and to send unlabeled network traffic by default.
+ *
+ */
+int netlbl_unlabel_defconf(void)
+{
+ int ret_val;
+ struct netlbl_dom_map *entry;
+ struct netlbl_audit audit_info;
+
+ /* Only the kernel is allowed to call this function and the only time
+ * it is called is at bootup before the audit subsystem is reporting
+ * messages so don't worry to much about these values. */
+ security_task_getsecid(current, &audit_info.secid);
+ audit_info.loginuid = 0;
+
+ entry = kzalloc(sizeof(*entry), GFP_KERNEL);
+ if (entry == NULL)
+ return -ENOMEM;
+ entry->type = NETLBL_NLTYPE_UNLABELED;
+ ret_val = netlbl_domhsh_add_default(entry, &audit_info);
+ if (ret_val != 0)
+ return ret_val;
+
+ netlbl_unlabel_acceptflg_set(1, &audit_info);
+
+ return 0;
+}
git://git.onelab.eu / linux-2.6.git / blobdiff