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.moore@hp.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, write to the Free Software 27 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 28 * 29 */ 30 31 #include <linux/init.h> 32 #include <linux/types.h> 33 #include <linux/list.h> 34 #include <linux/socket.h> 35 #include <linux/audit.h> 36 #include <linux/tty.h> 37 #include <linux/security.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 /* do not do any auditing if audit_enabled == 0, see kernel/audit.c for 50 * details */ 51 extern int audit_enabled; 52 53 /* 54 * NetLabel NETLINK Setup Functions 55 */ 56 57 /** 58 * netlbl_netlink_init - Initialize the NETLINK communication channel 59 * 60 * Description: 61 * Call out to the NetLabel components so they can register their families and 62 * commands with the Generic NETLINK mechanism. Returns zero on success and 63 * non-zero on failure. 64 * 65 */ 66 int netlbl_netlink_init(void) 67 { 68 int ret_val; 69 70 ret_val = netlbl_mgmt_genl_init(); 71 if (ret_val != 0) 72 return ret_val; 73 74 ret_val = netlbl_cipsov4_genl_init(); 75 if (ret_val != 0) 76 return ret_val; 77 78 ret_val = netlbl_unlabel_genl_init(); 79 if (ret_val != 0) 80 return ret_val; 81 82 return 0; 83 } 84 85 /* 86 * NetLabel Audit Functions 87 */ 88 89 /** 90 * netlbl_audit_start_common - Start an audit message 91 * @type: audit message type 92 * @audit_info: NetLabel audit information 93 * 94 * Description: 95 * Start an audit message using the type specified in @type and fill the audit 96 * message with some fields common to all NetLabel audit messages. Returns 97 * a pointer to the audit buffer on success, NULL on failure. 98 * 99 */ 100 struct audit_buffer *netlbl_audit_start_common(int type, 101 struct netlbl_audit *audit_info) 102 { 103 struct audit_context *audit_ctx = current->audit_context; 104 struct audit_buffer *audit_buf; 105 char *secctx; 106 u32 secctx_len; 107 108 if (audit_enabled == 0) 109 return NULL; 110 111 audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type); 112 if (audit_buf == NULL) 113 return NULL; 114 115 audit_log_format(audit_buf, "netlabel: auid=%u", audit_info->loginuid); 116 117 if (audit_info->secid != 0 && 118 security_secid_to_secctx(audit_info->secid, 119 &secctx, 120 &secctx_len) == 0) 121 audit_log_format(audit_buf, " subj=%s", secctx); 122 123 return audit_buf; 124 } 125