Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 1 | /* |
| 2 | * NetLabel Unlabeled Support |
| 3 | * |
| 4 | * This file defines functions for dealing with unlabeled packets for the |
| 5 | * NetLabel system. The NetLabel system manages static and dynamic label |
| 6 | * mappings for network 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/types.h> |
| 32 | #include <linux/rcupdate.h> |
| 33 | #include <linux/list.h> |
| 34 | #include <linux/spinlock.h> |
| 35 | #include <linux/socket.h> |
| 36 | #include <linux/string.h> |
| 37 | #include <linux/skbuff.h> |
| 38 | #include <net/sock.h> |
| 39 | #include <net/netlink.h> |
| 40 | #include <net/genetlink.h> |
| 41 | |
| 42 | #include <net/netlabel.h> |
| 43 | #include <asm/bug.h> |
| 44 | |
| 45 | #include "netlabel_user.h" |
| 46 | #include "netlabel_domainhash.h" |
| 47 | #include "netlabel_unlabeled.h" |
| 48 | |
| 49 | /* Accept unlabeled packets flag */ |
| 50 | static atomic_t netlabel_unlabel_accept_flg = ATOMIC_INIT(0); |
| 51 | |
| 52 | /* NetLabel Generic NETLINK CIPSOv4 family */ |
| 53 | static struct genl_family netlbl_unlabel_gnl_family = { |
| 54 | .id = GENL_ID_GENERATE, |
| 55 | .hdrsize = 0, |
| 56 | .name = NETLBL_NLTYPE_UNLABELED_NAME, |
| 57 | .version = NETLBL_PROTO_VERSION, |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 58 | .maxattr = NLBL_UNLABEL_A_MAX, |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 59 | }; |
| 60 | |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 61 | /* NetLabel Netlink attribute policy */ |
| 62 | static struct nla_policy netlbl_unlabel_genl_policy[NLBL_UNLABEL_A_MAX + 1] = { |
| 63 | [NLBL_UNLABEL_A_ACPTFLG] = { .type = NLA_U8 }, |
| 64 | }; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 65 | |
| 66 | /* |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame^] | 67 | * Helper Functions |
| 68 | */ |
| 69 | |
| 70 | /** |
| 71 | * netlbl_unlabel_acceptflg_set - Set the unlabeled accept flag |
| 72 | * @value: desired value |
| 73 | * @audit_secid: the LSM secid to use in the audit message |
| 74 | * |
| 75 | * Description: |
| 76 | * Set the value of the unlabeled accept flag to @value. |
| 77 | * |
| 78 | */ |
| 79 | static void netlbl_unlabel_acceptflg_set(u8 value, u32 audit_secid) |
| 80 | { |
| 81 | atomic_set(&netlabel_unlabel_accept_flg, value); |
| 82 | netlbl_audit_nomsg((value ? |
| 83 | AUDIT_MAC_UNLBL_ACCEPT : AUDIT_MAC_UNLBL_DENY), |
| 84 | audit_secid); |
| 85 | } |
| 86 | |
| 87 | /* |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 88 | * NetLabel Command Handlers |
| 89 | */ |
| 90 | |
| 91 | /** |
| 92 | * netlbl_unlabel_accept - Handle an ACCEPT message |
| 93 | * @skb: the NETLINK buffer |
| 94 | * @info: the Generic NETLINK info block |
| 95 | * |
| 96 | * Description: |
| 97 | * Process a user generated ACCEPT message and set the accept flag accordingly. |
| 98 | * Returns zero on success, negative values on failure. |
| 99 | * |
| 100 | */ |
| 101 | static int netlbl_unlabel_accept(struct sk_buff *skb, struct genl_info *info) |
| 102 | { |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 103 | u8 value; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 104 | |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 105 | if (info->attrs[NLBL_UNLABEL_A_ACPTFLG]) { |
| 106 | value = nla_get_u8(info->attrs[NLBL_UNLABEL_A_ACPTFLG]); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 107 | if (value == 1 || value == 0) { |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame^] | 108 | netlbl_unlabel_acceptflg_set(value, |
| 109 | NETLINK_CB(skb).sid); |
| 110 | return 0; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 111 | } |
| 112 | } |
| 113 | |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame^] | 114 | return -EINVAL; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 115 | } |
| 116 | |
| 117 | /** |
| 118 | * netlbl_unlabel_list - Handle a LIST message |
| 119 | * @skb: the NETLINK buffer |
| 120 | * @info: the Generic NETLINK info block |
| 121 | * |
| 122 | * Description: |
| 123 | * Process a user generated LIST message and respond with the current status. |
| 124 | * Returns zero on success, negative values on failure. |
| 125 | * |
| 126 | */ |
| 127 | static int netlbl_unlabel_list(struct sk_buff *skb, struct genl_info *info) |
| 128 | { |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 129 | int ret_val = -EINVAL; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 130 | struct sk_buff *ans_skb; |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 131 | void *data; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 132 | |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 133 | ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 134 | if (ans_skb == NULL) |
| 135 | goto list_failure; |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 136 | data = netlbl_netlink_hdr_put(ans_skb, |
| 137 | info->snd_pid, |
| 138 | info->snd_seq, |
| 139 | netlbl_unlabel_gnl_family.id, |
| 140 | 0, |
| 141 | NLBL_UNLABEL_C_LIST); |
| 142 | if (data == NULL) { |
| 143 | ret_val = -ENOMEM; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 144 | goto list_failure; |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 145 | } |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 146 | |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 147 | ret_val = nla_put_u8(ans_skb, |
| 148 | NLBL_UNLABEL_A_ACPTFLG, |
| 149 | atomic_read(&netlabel_unlabel_accept_flg)); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 150 | if (ret_val != 0) |
| 151 | goto list_failure; |
| 152 | |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 153 | genlmsg_end(ans_skb, data); |
| 154 | |
| 155 | ret_val = genlmsg_unicast(ans_skb, info->snd_pid); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 156 | if (ret_val != 0) |
| 157 | goto list_failure; |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 158 | return 0; |
| 159 | |
| 160 | list_failure: |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 161 | kfree(ans_skb); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 162 | return ret_val; |
| 163 | } |
| 164 | |
| 165 | |
| 166 | /* |
| 167 | * NetLabel Generic NETLINK Command Definitions |
| 168 | */ |
| 169 | |
| 170 | static struct genl_ops netlbl_unlabel_genl_c_accept = { |
| 171 | .cmd = NLBL_UNLABEL_C_ACCEPT, |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 172 | .flags = GENL_ADMIN_PERM, |
| 173 | .policy = netlbl_unlabel_genl_policy, |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 174 | .doit = netlbl_unlabel_accept, |
| 175 | .dumpit = NULL, |
| 176 | }; |
| 177 | |
| 178 | static struct genl_ops netlbl_unlabel_genl_c_list = { |
| 179 | .cmd = NLBL_UNLABEL_C_LIST, |
| 180 | .flags = 0, |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 181 | .policy = netlbl_unlabel_genl_policy, |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 182 | .doit = netlbl_unlabel_list, |
| 183 | .dumpit = NULL, |
| 184 | }; |
| 185 | |
| 186 | |
| 187 | /* |
| 188 | * NetLabel Generic NETLINK Protocol Functions |
| 189 | */ |
| 190 | |
| 191 | /** |
| 192 | * netlbl_unlabel_genl_init - Register the Unlabeled NetLabel component |
| 193 | * |
| 194 | * Description: |
| 195 | * Register the unlabeled packet NetLabel component with the Generic NETLINK |
| 196 | * mechanism. Returns zero on success, negative values on failure. |
| 197 | * |
| 198 | */ |
| 199 | int netlbl_unlabel_genl_init(void) |
| 200 | { |
| 201 | int ret_val; |
| 202 | |
| 203 | ret_val = genl_register_family(&netlbl_unlabel_gnl_family); |
| 204 | if (ret_val != 0) |
| 205 | return ret_val; |
| 206 | |
| 207 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, |
| 208 | &netlbl_unlabel_genl_c_accept); |
| 209 | if (ret_val != 0) |
| 210 | return ret_val; |
| 211 | |
| 212 | ret_val = genl_register_ops(&netlbl_unlabel_gnl_family, |
| 213 | &netlbl_unlabel_genl_c_list); |
| 214 | if (ret_val != 0) |
| 215 | return ret_val; |
| 216 | |
| 217 | return 0; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * NetLabel KAPI Hooks |
| 222 | */ |
| 223 | |
| 224 | /** |
| 225 | * netlbl_unlabel_getattr - Get the security attributes for an unlabled packet |
| 226 | * @secattr: the security attributes |
| 227 | * |
| 228 | * Description: |
| 229 | * Determine the security attributes, if any, for an unlabled packet and return |
| 230 | * them in @secattr. Returns zero on success and negative values on failure. |
| 231 | * |
| 232 | */ |
| 233 | int netlbl_unlabel_getattr(struct netlbl_lsm_secattr *secattr) |
| 234 | { |
Paul Moore | fd38585 | 2006-09-25 15:56:37 -0700 | [diff] [blame] | 235 | if (atomic_read(&netlabel_unlabel_accept_flg) == 1) |
| 236 | return netlbl_secattr_init(secattr); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 237 | |
| 238 | return -ENOMSG; |
| 239 | } |
| 240 | |
| 241 | /** |
| 242 | * netlbl_unlabel_defconf - Set the default config to allow unlabeled packets |
| 243 | * |
| 244 | * Description: |
| 245 | * Set the default NetLabel configuration to allow incoming unlabeled packets |
| 246 | * and to send unlabeled network traffic by default. |
| 247 | * |
| 248 | */ |
| 249 | int netlbl_unlabel_defconf(void) |
| 250 | { |
| 251 | int ret_val; |
| 252 | struct netlbl_dom_map *entry; |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame^] | 253 | u32 secid; |
| 254 | |
| 255 | security_task_getsecid(current, &secid); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 256 | |
| 257 | entry = kzalloc(sizeof(*entry), GFP_KERNEL); |
| 258 | if (entry == NULL) |
| 259 | return -ENOMEM; |
| 260 | entry->type = NETLBL_NLTYPE_UNLABELED; |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame^] | 261 | ret_val = netlbl_domhsh_add_default(entry, secid); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 262 | if (ret_val != 0) |
| 263 | return ret_val; |
| 264 | |
Paul Moore | 32f50cd | 2006-09-28 14:51:47 -0700 | [diff] [blame^] | 265 | netlbl_unlabel_acceptflg_set(1, secid); |
Paul Moore | 96cb8e3 | 2006-08-03 16:48:59 -0700 | [diff] [blame] | 266 | |
| 267 | return 0; |
| 268 | } |