1 // SPDX-License-Identifier: GPL-2.0-or-later 2 /* 3 * NetLabel NETLINK Interface 4 * 5 * This file defines the NETLINK interface for the NetLabel system. The 6 * NetLabel system manages static and dynamic label mappings for network 7 * protocols such as CIPSO and RIPSO. 8 * 9 * Author: Paul Moore <paul@paul-moore.com> 10 */ 11 12 /* 13 * (c) Copyright Hewlett-Packard Development Company, L.P., 2006 14 */ 15 16 #include <linux/init.h> 17 #include <linux/types.h> 18 #include <linux/list.h> 19 #include <linux/socket.h> 20 #include <linux/audit.h> 21 #include <linux/tty.h> 22 #include <linux/security.h> 23 #include <linux/gfp.h> 24 #include <net/sock.h> 25 #include <net/netlink.h> 26 #include <net/genetlink.h> 27 #include <net/netlabel.h> 28 #include <asm/bug.h> 29 30 #include "netlabel_mgmt.h" 31 #include "netlabel_unlabeled.h" 32 #include "netlabel_cipso_v4.h" 33 #include "netlabel_calipso.h" 34 #include "netlabel_user.h" 35 36 /* 37 * NetLabel NETLINK Setup Functions 38 */ 39 40 /** 41 * netlbl_netlink_init - Initialize the NETLINK communication channel 42 * 43 * Description: 44 * Call out to the NetLabel components so they can register their families and 45 * commands with the Generic NETLINK mechanism. Returns zero on success and 46 * non-zero on failure. 47 * 48 */ 49 int __init netlbl_netlink_init(void) 50 { 51 int ret_val; 52 53 ret_val = netlbl_mgmt_genl_init(); 54 if (ret_val != 0) 55 return ret_val; 56 57 ret_val = netlbl_cipsov4_genl_init(); 58 if (ret_val != 0) 59 return ret_val; 60 61 ret_val = netlbl_calipso_genl_init(); 62 if (ret_val != 0) 63 return ret_val; 64 65 return netlbl_unlabel_genl_init(); 66 } 67 68 /* 69 * NetLabel Audit Functions 70 */ 71 72 /** 73 * netlbl_audit_start_common - Start an audit message 74 * @type: audit message type 75 * @audit_info: NetLabel audit information 76 * 77 * Description: 78 * Start an audit message using the type specified in @type and fill the audit 79 * message with some fields common to all NetLabel audit messages. Returns 80 * a pointer to the audit buffer on success, NULL on failure. 81 * 82 */ 83 struct audit_buffer *netlbl_audit_start_common(int type, 84 struct netlbl_audit *audit_info) 85 { 86 struct audit_buffer *audit_buf; 87 char *secctx; 88 u32 secctx_len; 89 90 if (audit_enabled == AUDIT_OFF) 91 return NULL; 92 93 audit_buf = audit_log_start(audit_context(), GFP_ATOMIC, type); 94 if (audit_buf == NULL) 95 return NULL; 96 97 audit_log_format(audit_buf, "netlabel: auid=%u ses=%u", 98 from_kuid(&init_user_ns, audit_info->loginuid), 99 audit_info->sessionid); 100 101 if (audit_info->secid != 0 && 102 security_secid_to_secctx(audit_info->secid, 103 &secctx, 104 &secctx_len) == 0) { 105 audit_log_format(audit_buf, " subj=%s", secctx); 106 security_release_secctx(secctx, secctx_len); 107 } 108 109 return audit_buf; 110 } 111