1 /* 2 * NetLabel NETLINK Interface 3 * 4 * This file defines the NETLINK interface for the NetLabel system. The 5 * NetLabel system manages static and dynamic label mappings for network 6 * protocols such as CIPSO and RIPSO. 7 * 8 * Author: Paul Moore <paul@paul-moore.com> 9 * 10 */ 11 12 /* 13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 14 * 15 * This program is free software; you can redistribute it and/or modify 16 * it under the terms of the GNU General Public License as published by 17 * the Free Software Foundation; either version 2 of the License, or 18 * (at your option) any later version. 19 * 20 * This program is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See 23 * the GNU General Public License for more details. 24 * 25 * You should have received a copy of the GNU General Public License 26 * along with this program; if not, see <http://www.gnu.org/licenses/>. 27 * 28 */ 29 30 #include <linux/init.h> 31 #include <linux/types.h> 32 #include <linux/list.h> 33 #include <linux/socket.h> 34 #include <linux/audit.h> 35 #include <linux/tty.h> 36 #include <linux/security.h> 37 #include <linux/gfp.h> 38 #include <net/sock.h> 39 #include <net/netlink.h> 40 #include <net/genetlink.h> 41 #include <net/netlabel.h> 42 #include <asm/bug.h> 43 44 #include "netlabel_mgmt.h" 45 #include "netlabel_unlabeled.h" 46 #include "netlabel_cipso_v4.h" 47 #include "netlabel_user.h" 48 49 /* 50 * NetLabel NETLINK Setup Functions 51 */ 52 53 /** 54 * netlbl_netlink_init - Initialize the NETLINK communication channel 55 * 56 * Description: 57 * Call out to the NetLabel components so they can register their families and 58 * commands with the Generic NETLINK mechanism. Returns zero on success and 59 * non-zero on failure. 60 * 61 */ 62 int __init netlbl_netlink_init(void) 63 { 64 int ret_val; 65 66 ret_val = netlbl_mgmt_genl_init(); 67 if (ret_val != 0) 68 return ret_val; 69 70 ret_val = netlbl_cipsov4_genl_init(); 71 if (ret_val != 0) 72 return ret_val; 73 74 return netlbl_unlabel_genl_init(); 75 } 76 77 /* 78 * NetLabel Audit Functions 79 */ 80 81 /** 82 * netlbl_audit_start_common - Start an audit message 83 * @type: audit message type 84 * @audit_info: NetLabel audit information 85 * 86 * Description: 87 * Start an audit message using the type specified in @type and fill the audit 88 * message with some fields common to all NetLabel audit messages. Returns 89 * a pointer to the audit buffer on success, NULL on failure. 90 * 91 */ 92 struct audit_buffer *netlbl_audit_start_common(int type, 93 struct netlbl_audit *audit_info) 94 { 95 struct audit_buffer *audit_buf; 96 char *secctx; 97 u32 secctx_len; 98 99 if (audit_enabled == 0) 100 return NULL; 101 102 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC, type); 103 if (audit_buf == NULL) 104 return NULL; 105 106 audit_log_format(audit_buf, "netlabel: auid=%u ses=%u", 107 from_kuid(&init_user_ns, audit_info->loginuid), 108 audit_info->sessionid); 109 110 if (audit_info->secid != 0 && 111 security_secid_to_secctx(audit_info->secid, 112 &secctx, 113 &secctx_len) == 0) { 114 audit_log_format(audit_buf, " subj=%s", secctx); 115 security_release_secctx(secctx, secctx_len); 116 } 117 118 return audit_buf; 119 } 120