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 /* 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 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 ret_val = netlbl_unlabel_genl_init(); 75 if (ret_val != 0) 76 return ret_val; 77 78 return 0; 79 } 80 81 /* 82 * NetLabel Audit Functions 83 */ 84 85 /** 86 * netlbl_audit_start_common - Start an audit message 87 * @type: audit message type 88 * @secid: LSM context ID 89 * 90 * Description: 91 * Start an audit message using the type specified in @type and fill the audit 92 * message with some fields common to all NetLabel audit messages. Returns 93 * a pointer to the audit buffer on success, NULL on failure. 94 * 95 */ 96 struct audit_buffer *netlbl_audit_start_common(int type, u32 secid) 97 { 98 struct audit_context *audit_ctx = current->audit_context; 99 struct audit_buffer *audit_buf; 100 uid_t audit_loginuid; 101 const char *audit_tty; 102 char audit_comm[sizeof(current->comm)]; 103 struct vm_area_struct *vma; 104 char *secctx; 105 u32 secctx_len; 106 107 audit_buf = audit_log_start(audit_ctx, GFP_ATOMIC, type); 108 if (audit_buf == NULL) 109 return NULL; 110 111 audit_loginuid = audit_get_loginuid(audit_ctx); 112 if (current->signal && 113 current->signal->tty && 114 current->signal->tty->name) 115 audit_tty = current->signal->tty->name; 116 else 117 audit_tty = "(none)"; 118 get_task_comm(audit_comm, current); 119 120 audit_log_format(audit_buf, 121 "netlabel: auid=%u uid=%u tty=%s pid=%d", 122 audit_loginuid, 123 current->uid, 124 audit_tty, 125 current->pid); 126 audit_log_format(audit_buf, " comm="); 127 audit_log_untrustedstring(audit_buf, audit_comm); 128 if (current->mm) { 129 down_read(¤t->mm->mmap_sem); 130 vma = current->mm->mmap; 131 while (vma) { 132 if ((vma->vm_flags & VM_EXECUTABLE) && 133 vma->vm_file) { 134 audit_log_d_path(audit_buf, 135 " exe=", 136 vma->vm_file->f_dentry, 137 vma->vm_file->f_vfsmnt); 138 break; 139 } 140 vma = vma->vm_next; 141 } 142 up_read(¤t->mm->mmap_sem); 143 } 144 145 if (secid != 0 && 146 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) 147 audit_log_format(audit_buf, " subj=%s", secctx); 148 149 return audit_buf; 150 } 151 152 /** 153 * netlbl_audit_nomsg - Send an audit message without additional text 154 * @type: audit message type 155 * @secid: LSM context ID 156 * 157 * Description: 158 * Send an audit message with only the common NetLabel audit fields. 159 * 160 */ 161 void netlbl_audit_nomsg(int type, u32 secid) 162 { 163 struct audit_buffer *audit_buf; 164 165 audit_buf = netlbl_audit_start_common(type, secid); 166 audit_log_end(audit_buf); 167 } 168