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