Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* keyctl.c: userspace keyctl operations |
| 2 | * |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004-5 Red Hat, Inc. All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * Written by David Howells (dhowells@redhat.com) |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
| 11 | |
| 12 | #include <linux/module.h> |
| 13 | #include <linux/init.h> |
| 14 | #include <linux/sched.h> |
| 15 | #include <linux/slab.h> |
| 16 | #include <linux/syscalls.h> |
| 17 | #include <linux/keyctl.h> |
| 18 | #include <linux/fs.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 19 | #include <linux/capability.h> |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 20 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <linux/err.h> |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 22 | #include <linux/vmalloc.h> |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 23 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/uaccess.h> |
| 25 | #include "internal.h" |
| 26 | |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 27 | static int key_get_type_from_user(char *type, |
| 28 | const char __user *_type, |
| 29 | unsigned len) |
| 30 | { |
| 31 | int ret; |
| 32 | |
| 33 | ret = strncpy_from_user(type, _type, len); |
| 34 | |
| 35 | if (ret < 0) |
Dan Carpenter | 4303ef1 | 2010-06-11 17:30:05 +0100 | [diff] [blame] | 36 | return ret; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 37 | |
| 38 | if (ret == 0 || ret >= len) |
| 39 | return -EINVAL; |
| 40 | |
| 41 | if (type[0] == '.') |
| 42 | return -EPERM; |
| 43 | |
| 44 | type[len - 1] = '\0'; |
| 45 | |
| 46 | return 0; |
| 47 | } |
| 48 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | /*****************************************************************************/ |
| 50 | /* |
| 51 | * extract the description of a new key from userspace and either add it as a |
| 52 | * new key to the specified keyring or update a matching key in that keyring |
| 53 | * - the keyring must be writable |
| 54 | * - returns the new key's serial number |
| 55 | * - implements add_key() |
| 56 | */ |
Heiko Carstens | 1e7bfb2 | 2009-01-14 14:14:29 +0100 | [diff] [blame] | 57 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
| 58 | const char __user *, _description, |
| 59 | const void __user *, _payload, |
| 60 | size_t, plen, |
| 61 | key_serial_t, ringid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 63 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | char type[32], *description; |
| 65 | void *payload; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 66 | long ret; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 67 | bool vm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | |
| 69 | ret = -EINVAL; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 70 | if (plen > 1024 * 1024 - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | goto error; |
| 72 | |
| 73 | /* draw all the data into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 74 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | if (ret < 0) |
| 76 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 78 | description = strndup_user(_description, PAGE_SIZE); |
| 79 | if (IS_ERR(description)) { |
| 80 | ret = PTR_ERR(description); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 81 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 82 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | |
| 84 | /* pull the payload in if one was supplied */ |
| 85 | payload = NULL; |
| 86 | |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 87 | vm = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | if (_payload) { |
| 89 | ret = -ENOMEM; |
| 90 | payload = kmalloc(plen, GFP_KERNEL); |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 91 | if (!payload) { |
| 92 | if (plen <= PAGE_SIZE) |
| 93 | goto error2; |
| 94 | vm = true; |
| 95 | payload = vmalloc(plen); |
| 96 | if (!payload) |
| 97 | goto error2; |
| 98 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | |
| 100 | ret = -EFAULT; |
| 101 | if (copy_from_user(payload, _payload, plen) != 0) |
| 102 | goto error3; |
| 103 | } |
| 104 | |
| 105 | /* find the target keyring (which must be writable) */ |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 106 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 107 | if (IS_ERR(keyring_ref)) { |
| 108 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | goto error3; |
| 110 | } |
| 111 | |
| 112 | /* create or update the requested key and add it to the target |
| 113 | * keyring */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 114 | key_ref = key_create_or_update(keyring_ref, type, description, |
Arun Raghavan | 6b79ccb | 2008-04-29 01:01:28 -0700 | [diff] [blame] | 115 | payload, plen, KEY_PERM_UNDEF, |
| 116 | KEY_ALLOC_IN_QUOTA); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 117 | if (!IS_ERR(key_ref)) { |
| 118 | ret = key_ref_to_ptr(key_ref)->serial; |
| 119 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | } |
| 121 | else { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 122 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | } |
| 124 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 125 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | error3: |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 127 | if (!vm) |
| 128 | kfree(payload); |
| 129 | else |
| 130 | vfree(payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | error2: |
| 132 | kfree(description); |
| 133 | error: |
| 134 | return ret; |
| 135 | |
| 136 | } /* end sys_add_key() */ |
| 137 | |
| 138 | /*****************************************************************************/ |
| 139 | /* |
| 140 | * search the process keyrings for a matching key |
| 141 | * - nested keyrings may also be searched if they have Search permission |
| 142 | * - if a key is found, it will be attached to the destination keyring if |
| 143 | * there's one specified |
| 144 | * - /sbin/request-key will be invoked if _callout_info is non-NULL |
| 145 | * - the _callout_info string will be passed to /sbin/request-key |
| 146 | * - if the _callout_info string is empty, it will be rendered as "-" |
| 147 | * - implements request_key() |
| 148 | */ |
Heiko Carstens | 1e7bfb2 | 2009-01-14 14:14:29 +0100 | [diff] [blame] | 149 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
| 150 | const char __user *, _description, |
| 151 | const char __user *, _callout_info, |
| 152 | key_serial_t, destringid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | { |
| 154 | struct key_type *ktype; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 155 | struct key *key; |
| 156 | key_ref_t dest_ref; |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 157 | size_t callout_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | char type[32], *description, *callout_info; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 159 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | /* pull the type into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 162 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | if (ret < 0) |
| 164 | goto error; |
David Howells | 1260f80 | 2005-08-04 11:50:01 +0100 | [diff] [blame] | 165 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 166 | /* pull the description into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 167 | description = strndup_user(_description, PAGE_SIZE); |
| 168 | if (IS_ERR(description)) { |
| 169 | ret = PTR_ERR(description); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 172 | |
| 173 | /* pull the callout info into kernel space */ |
| 174 | callout_info = NULL; |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 175 | callout_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | if (_callout_info) { |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 177 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
| 178 | if (IS_ERR(callout_info)) { |
| 179 | ret = PTR_ERR(callout_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | goto error2; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 181 | } |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 182 | callout_len = strlen(callout_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
| 185 | /* get the destination keyring if specified */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 186 | dest_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | if (destringid) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 188 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
| 189 | KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 190 | if (IS_ERR(dest_ref)) { |
| 191 | ret = PTR_ERR(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | goto error3; |
| 193 | } |
| 194 | } |
| 195 | |
| 196 | /* find the key type */ |
| 197 | ktype = key_type_lookup(type); |
| 198 | if (IS_ERR(ktype)) { |
| 199 | ret = PTR_ERR(ktype); |
| 200 | goto error4; |
| 201 | } |
| 202 | |
| 203 | /* do the search */ |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 204 | key = request_key_and_link(ktype, description, callout_info, |
| 205 | callout_len, NULL, key_ref_to_ptr(dest_ref), |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 206 | KEY_ALLOC_IN_QUOTA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | if (IS_ERR(key)) { |
| 208 | ret = PTR_ERR(key); |
| 209 | goto error5; |
| 210 | } |
| 211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | ret = key->serial; |
| 213 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 214 | key_put(key); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 215 | error5: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | key_type_put(ktype); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 217 | error4: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 218 | key_ref_put(dest_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 219 | error3: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | kfree(callout_info); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 221 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | kfree(description); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 223 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | return ret; |
| 225 | |
| 226 | } /* end sys_request_key() */ |
| 227 | |
| 228 | /*****************************************************************************/ |
| 229 | /* |
| 230 | * get the ID of the specified process keyring |
| 231 | * - the keyring must have search permission to be found |
| 232 | * - implements keyctl(KEYCTL_GET_KEYRING_ID) |
| 233 | */ |
| 234 | long keyctl_get_keyring_ID(key_serial_t id, int create) |
| 235 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 236 | key_ref_t key_ref; |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 237 | unsigned long lflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | long ret; |
| 239 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 240 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
| 241 | key_ref = lookup_user_key(id, lflags, KEY_SEARCH); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 242 | if (IS_ERR(key_ref)) { |
| 243 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | goto error; |
| 245 | } |
| 246 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 247 | ret = key_ref_to_ptr(key_ref)->serial; |
| 248 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 249 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | return ret; |
| 251 | |
| 252 | } /* end keyctl_get_keyring_ID() */ |
| 253 | |
| 254 | /*****************************************************************************/ |
| 255 | /* |
| 256 | * join the session keyring |
| 257 | * - implements keyctl(KEYCTL_JOIN_SESSION_KEYRING) |
| 258 | */ |
| 259 | long keyctl_join_session_keyring(const char __user *_name) |
| 260 | { |
| 261 | char *name; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 262 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | |
| 264 | /* fetch the name from userspace */ |
| 265 | name = NULL; |
| 266 | if (_name) { |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 267 | name = strndup_user(_name, PAGE_SIZE); |
| 268 | if (IS_ERR(name)) { |
| 269 | ret = PTR_ERR(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 271 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | } |
| 273 | |
| 274 | /* join the session */ |
| 275 | ret = join_session_keyring(name); |
Vegard Nossum | 0d54ee1 | 2009-01-17 17:45:45 +0100 | [diff] [blame] | 276 | kfree(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 278 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | return ret; |
| 280 | |
| 281 | } /* end keyctl_join_session_keyring() */ |
| 282 | |
| 283 | /*****************************************************************************/ |
| 284 | /* |
| 285 | * update a key's data payload |
| 286 | * - the key must be writable |
| 287 | * - implements keyctl(KEYCTL_UPDATE) |
| 288 | */ |
| 289 | long keyctl_update_key(key_serial_t id, |
| 290 | const void __user *_payload, |
| 291 | size_t plen) |
| 292 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 293 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 294 | void *payload; |
| 295 | long ret; |
| 296 | |
| 297 | ret = -EINVAL; |
| 298 | if (plen > PAGE_SIZE) |
| 299 | goto error; |
| 300 | |
| 301 | /* pull the payload in if one was supplied */ |
| 302 | payload = NULL; |
| 303 | if (_payload) { |
| 304 | ret = -ENOMEM; |
| 305 | payload = kmalloc(plen, GFP_KERNEL); |
| 306 | if (!payload) |
| 307 | goto error; |
| 308 | |
| 309 | ret = -EFAULT; |
| 310 | if (copy_from_user(payload, _payload, plen) != 0) |
| 311 | goto error2; |
| 312 | } |
| 313 | |
| 314 | /* find the target key (which must be writable) */ |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 315 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 316 | if (IS_ERR(key_ref)) { |
| 317 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | goto error2; |
| 319 | } |
| 320 | |
| 321 | /* update the key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 322 | ret = key_update(key_ref, payload, plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 324 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 325 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | kfree(payload); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 327 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 328 | return ret; |
| 329 | |
| 330 | } /* end keyctl_update_key() */ |
| 331 | |
| 332 | /*****************************************************************************/ |
| 333 | /* |
| 334 | * revoke a key |
| 335 | * - the key must be writable |
| 336 | * - implements keyctl(KEYCTL_REVOKE) |
| 337 | */ |
| 338 | long keyctl_revoke_key(key_serial_t id) |
| 339 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 340 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | long ret; |
| 342 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 343 | key_ref = lookup_user_key(id, 0, KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 344 | if (IS_ERR(key_ref)) { |
| 345 | ret = PTR_ERR(key_ref); |
David Howells | 0c2c9a3 | 2009-09-02 09:13:50 +0100 | [diff] [blame] | 346 | if (ret != -EACCES) |
| 347 | goto error; |
| 348 | key_ref = lookup_user_key(id, 0, KEY_SETATTR); |
| 349 | if (IS_ERR(key_ref)) { |
| 350 | ret = PTR_ERR(key_ref); |
| 351 | goto error; |
| 352 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | } |
| 354 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 355 | key_revoke(key_ref_to_ptr(key_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | ret = 0; |
| 357 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 358 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 359 | error: |
David Howells | 1260f80 | 2005-08-04 11:50:01 +0100 | [diff] [blame] | 360 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | } /* end keyctl_revoke_key() */ |
| 363 | |
| 364 | /*****************************************************************************/ |
| 365 | /* |
| 366 | * clear the specified process keyring |
| 367 | * - the keyring must be writable |
| 368 | * - implements keyctl(KEYCTL_CLEAR) |
| 369 | */ |
| 370 | long keyctl_keyring_clear(key_serial_t ringid) |
| 371 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 372 | key_ref_t keyring_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | long ret; |
| 374 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 375 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 376 | if (IS_ERR(keyring_ref)) { |
| 377 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | goto error; |
| 379 | } |
| 380 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 381 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 383 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 384 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | return ret; |
| 386 | |
| 387 | } /* end keyctl_keyring_clear() */ |
| 388 | |
| 389 | /*****************************************************************************/ |
| 390 | /* |
| 391 | * link a key into a keyring |
| 392 | * - the keyring must be writable |
| 393 | * - the key must be linkable |
| 394 | * - implements keyctl(KEYCTL_LINK) |
| 395 | */ |
| 396 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) |
| 397 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 398 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | long ret; |
| 400 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 401 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 402 | if (IS_ERR(keyring_ref)) { |
| 403 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | goto error; |
| 405 | } |
| 406 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 407 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_LINK); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 408 | if (IS_ERR(key_ref)) { |
| 409 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | goto error2; |
| 411 | } |
| 412 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 413 | ret = key_link(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 415 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 416 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 417 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 418 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 419 | return ret; |
| 420 | |
| 421 | } /* end keyctl_keyring_link() */ |
| 422 | |
| 423 | /*****************************************************************************/ |
| 424 | /* |
| 425 | * unlink the first attachment of a key from a keyring |
| 426 | * - the keyring must be writable |
| 427 | * - we don't need any permissions on the key |
| 428 | * - implements keyctl(KEYCTL_UNLINK) |
| 429 | */ |
| 430 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) |
| 431 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 432 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | long ret; |
| 434 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 435 | keyring_ref = lookup_user_key(ringid, 0, KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 436 | if (IS_ERR(keyring_ref)) { |
| 437 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | goto error; |
| 439 | } |
| 440 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 441 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 442 | if (IS_ERR(key_ref)) { |
| 443 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | goto error2; |
| 445 | } |
| 446 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 447 | ret = key_unlink(key_ref_to_ptr(keyring_ref), key_ref_to_ptr(key_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 449 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 450 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 451 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 452 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | return ret; |
| 454 | |
| 455 | } /* end keyctl_keyring_unlink() */ |
| 456 | |
| 457 | /*****************************************************************************/ |
| 458 | /* |
| 459 | * describe a user key |
| 460 | * - the key must have view permission |
| 461 | * - if there's a buffer, we place up to buflen bytes of data into it |
| 462 | * - unless there's an error, we return the amount of description available, |
| 463 | * irrespective of how much we may have copied |
| 464 | * - the description is formatted thus: |
| 465 | * type;uid;gid;perm;description<NUL> |
| 466 | * - implements keyctl(KEYCTL_DESCRIBE) |
| 467 | */ |
| 468 | long keyctl_describe_key(key_serial_t keyid, |
| 469 | char __user *buffer, |
| 470 | size_t buflen) |
| 471 | { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 472 | struct key *key, *instkey; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 473 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | char *tmpbuf; |
| 475 | long ret; |
| 476 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 477 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 478 | if (IS_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 479 | /* viewing a key under construction is permitted if we have the |
| 480 | * authorisation token handy */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 481 | if (PTR_ERR(key_ref) == -EACCES) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 482 | instkey = key_get_instantiation_authkey(keyid); |
| 483 | if (!IS_ERR(instkey)) { |
| 484 | key_put(instkey); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 485 | key_ref = lookup_user_key(keyid, |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 486 | KEY_LOOKUP_PARTIAL, |
| 487 | 0); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 488 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 489 | goto okay; |
| 490 | } |
| 491 | } |
| 492 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 493 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | goto error; |
| 495 | } |
| 496 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 497 | okay: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 498 | /* calculate how much description we're going to return */ |
| 499 | ret = -ENOMEM; |
| 500 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 501 | if (!tmpbuf) |
| 502 | goto error2; |
| 503 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 504 | key = key_ref_to_ptr(key_ref); |
| 505 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 507 | "%s;%d;%d;%08x;%s", |
David Howells | 94fd840 | 2010-06-28 14:05:04 +0100 | [diff] [blame] | 508 | key->type->name, |
| 509 | key->uid, |
| 510 | key->gid, |
| 511 | key->perm, |
| 512 | key->description ?: ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | |
| 514 | /* include a NUL char at the end of the data */ |
| 515 | if (ret > PAGE_SIZE - 1) |
| 516 | ret = PAGE_SIZE - 1; |
| 517 | tmpbuf[ret] = 0; |
| 518 | ret++; |
| 519 | |
| 520 | /* consider returning the data */ |
| 521 | if (buffer && buflen > 0) { |
| 522 | if (buflen > ret) |
| 523 | buflen = ret; |
| 524 | |
| 525 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) |
| 526 | ret = -EFAULT; |
| 527 | } |
| 528 | |
| 529 | kfree(tmpbuf); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 530 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 531 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 532 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | return ret; |
| 534 | |
| 535 | } /* end keyctl_describe_key() */ |
| 536 | |
| 537 | /*****************************************************************************/ |
| 538 | /* |
| 539 | * search the specified keyring for a matching key |
| 540 | * - the start keyring must be searchable |
| 541 | * - nested keyrings may also be searched if they are searchable |
| 542 | * - only keys with search permission may be found |
| 543 | * - if a key is found, it will be attached to the destination keyring if |
| 544 | * there's one specified |
| 545 | * - implements keyctl(KEYCTL_SEARCH) |
| 546 | */ |
| 547 | long keyctl_keyring_search(key_serial_t ringid, |
| 548 | const char __user *_type, |
| 549 | const char __user *_description, |
| 550 | key_serial_t destringid) |
| 551 | { |
| 552 | struct key_type *ktype; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 553 | key_ref_t keyring_ref, key_ref, dest_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | char type[32], *description; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 555 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 556 | |
| 557 | /* pull the type and description into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 558 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 559 | if (ret < 0) |
| 560 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 562 | description = strndup_user(_description, PAGE_SIZE); |
| 563 | if (IS_ERR(description)) { |
| 564 | ret = PTR_ERR(description); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 566 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 567 | |
| 568 | /* get the keyring at which to begin the search */ |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 569 | keyring_ref = lookup_user_key(ringid, 0, KEY_SEARCH); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 570 | if (IS_ERR(keyring_ref)) { |
| 571 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | goto error2; |
| 573 | } |
| 574 | |
| 575 | /* get the destination keyring if specified */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 576 | dest_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | if (destringid) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 578 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
| 579 | KEY_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 580 | if (IS_ERR(dest_ref)) { |
| 581 | ret = PTR_ERR(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | goto error3; |
| 583 | } |
| 584 | } |
| 585 | |
| 586 | /* find the key type */ |
| 587 | ktype = key_type_lookup(type); |
| 588 | if (IS_ERR(ktype)) { |
| 589 | ret = PTR_ERR(ktype); |
| 590 | goto error4; |
| 591 | } |
| 592 | |
| 593 | /* do the search */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 594 | key_ref = keyring_search(keyring_ref, ktype, description); |
| 595 | if (IS_ERR(key_ref)) { |
| 596 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
| 598 | /* treat lack or presence of a negative key the same */ |
| 599 | if (ret == -EAGAIN) |
| 600 | ret = -ENOKEY; |
| 601 | goto error5; |
| 602 | } |
| 603 | |
| 604 | /* link the resulting key to the destination keyring if we can */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 605 | if (dest_ref) { |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 606 | ret = key_permission(key_ref, KEY_LINK); |
| 607 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 608 | goto error6; |
| 609 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 610 | ret = key_link(key_ref_to_ptr(dest_ref), key_ref_to_ptr(key_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | if (ret < 0) |
| 612 | goto error6; |
| 613 | } |
| 614 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 615 | ret = key_ref_to_ptr(key_ref)->serial; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 616 | |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 617 | error6: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 618 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 619 | error5: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | key_type_put(ktype); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 621 | error4: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 622 | key_ref_put(dest_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 623 | error3: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 624 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 625 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | kfree(description); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 627 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return ret; |
| 629 | |
| 630 | } /* end keyctl_keyring_search() */ |
| 631 | |
| 632 | /*****************************************************************************/ |
| 633 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | * read a user key's payload |
| 635 | * - the keyring must be readable or the key must be searchable from the |
| 636 | * process's keyrings |
| 637 | * - if there's a buffer, we place up to buflen bytes of data into it |
| 638 | * - unless there's an error, we return the amount of data in the key, |
| 639 | * irrespective of how much we may have copied |
| 640 | * - implements keyctl(KEYCTL_READ) |
| 641 | */ |
| 642 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) |
| 643 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 644 | struct key *key; |
| 645 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | long ret; |
| 647 | |
| 648 | /* find the key first */ |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 649 | key_ref = lookup_user_key(keyid, 0, 0); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 650 | if (IS_ERR(key_ref)) { |
| 651 | ret = -ENOKEY; |
| 652 | goto error; |
| 653 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 655 | key = key_ref_to_ptr(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 657 | /* see if we can read it directly */ |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 658 | ret = key_permission(key_ref, KEY_READ); |
| 659 | if (ret == 0) |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 660 | goto can_read_key; |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 661 | if (ret != -EACCES) |
| 662 | goto error; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 663 | |
| 664 | /* we can't; see if it's searchable from this process's keyrings |
| 665 | * - we automatically take account of the fact that it may be |
| 666 | * dangling off an instantiation key |
| 667 | */ |
| 668 | if (!is_key_possessed(key_ref)) { |
| 669 | ret = -EACCES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | goto error2; |
| 671 | } |
| 672 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | /* the key is probably readable - now try to read it */ |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 674 | can_read_key: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | ret = key_validate(key); |
| 676 | if (ret == 0) { |
| 677 | ret = -EOPNOTSUPP; |
| 678 | if (key->type->read) { |
| 679 | /* read the data with the semaphore held (since we |
| 680 | * might sleep) */ |
| 681 | down_read(&key->sem); |
| 682 | ret = key->type->read(key, buffer, buflen); |
| 683 | up_read(&key->sem); |
| 684 | } |
| 685 | } |
| 686 | |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 687 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | key_put(key); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 689 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | return ret; |
| 691 | |
| 692 | } /* end keyctl_read_key() */ |
| 693 | |
| 694 | /*****************************************************************************/ |
| 695 | /* |
| 696 | * change the ownership of a key |
| 697 | * - the keyring owned by the changer |
| 698 | * - if the uid or gid is -1, then that parameter is not changed |
| 699 | * - implements keyctl(KEYCTL_CHOWN) |
| 700 | */ |
| 701 | long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid) |
| 702 | { |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 703 | struct key_user *newowner, *zapowner = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 704 | struct key *key; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 705 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | long ret; |
| 707 | |
| 708 | ret = 0; |
| 709 | if (uid == (uid_t) -1 && gid == (gid_t) -1) |
| 710 | goto error; |
| 711 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 712 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
| 713 | KEY_SETATTR); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 714 | if (IS_ERR(key_ref)) { |
| 715 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | goto error; |
| 717 | } |
| 718 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 719 | key = key_ref_to_ptr(key_ref); |
| 720 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | /* make the changes with the locks held to prevent chown/chown races */ |
| 722 | ret = -EACCES; |
| 723 | down_write(&key->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | |
| 725 | if (!capable(CAP_SYS_ADMIN)) { |
| 726 | /* only the sysadmin can chown a key to some other UID */ |
| 727 | if (uid != (uid_t) -1 && key->uid != uid) |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 728 | goto error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
| 730 | /* only the sysadmin can set the key's GID to a group other |
| 731 | * than one of those that the current process subscribes to */ |
| 732 | if (gid != (gid_t) -1 && gid != key->gid && !in_group_p(gid)) |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 733 | goto error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | } |
| 735 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 736 | /* change the UID */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | if (uid != (uid_t) -1 && uid != key->uid) { |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 738 | ret = -ENOMEM; |
Serge E. Hallyn | 1d1e975 | 2009-02-26 18:27:38 -0600 | [diff] [blame] | 739 | newowner = key_user_lookup(uid, current_user_ns()); |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 740 | if (!newowner) |
| 741 | goto error_put; |
| 742 | |
| 743 | /* transfer the quota burden to the new user */ |
| 744 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { |
David Howells | 0b77f5b | 2008-04-29 01:01:32 -0700 | [diff] [blame] | 745 | unsigned maxkeys = (uid == 0) ? |
| 746 | key_quota_root_maxkeys : key_quota_maxkeys; |
| 747 | unsigned maxbytes = (uid == 0) ? |
| 748 | key_quota_root_maxbytes : key_quota_maxbytes; |
| 749 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 750 | spin_lock(&newowner->lock); |
David Howells | 0b77f5b | 2008-04-29 01:01:32 -0700 | [diff] [blame] | 751 | if (newowner->qnkeys + 1 >= maxkeys || |
| 752 | newowner->qnbytes + key->quotalen >= maxbytes || |
| 753 | newowner->qnbytes + key->quotalen < |
| 754 | newowner->qnbytes) |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 755 | goto quota_overrun; |
| 756 | |
| 757 | newowner->qnkeys++; |
| 758 | newowner->qnbytes += key->quotalen; |
| 759 | spin_unlock(&newowner->lock); |
| 760 | |
| 761 | spin_lock(&key->user->lock); |
| 762 | key->user->qnkeys--; |
| 763 | key->user->qnbytes -= key->quotalen; |
| 764 | spin_unlock(&key->user->lock); |
| 765 | } |
| 766 | |
| 767 | atomic_dec(&key->user->nkeys); |
| 768 | atomic_inc(&newowner->nkeys); |
| 769 | |
| 770 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { |
| 771 | atomic_dec(&key->user->nikeys); |
| 772 | atomic_inc(&newowner->nikeys); |
| 773 | } |
| 774 | |
| 775 | zapowner = key->user; |
| 776 | key->user = newowner; |
| 777 | key->uid = uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 778 | } |
| 779 | |
| 780 | /* change the GID */ |
| 781 | if (gid != (gid_t) -1) |
| 782 | key->gid = gid; |
| 783 | |
| 784 | ret = 0; |
| 785 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 786 | error_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | up_write(&key->sem); |
| 788 | key_put(key); |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 789 | if (zapowner) |
| 790 | key_user_put(zapowner); |
| 791 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | return ret; |
| 793 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 794 | quota_overrun: |
| 795 | spin_unlock(&newowner->lock); |
| 796 | zapowner = newowner; |
| 797 | ret = -EDQUOT; |
| 798 | goto error_put; |
| 799 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | } /* end keyctl_chown_key() */ |
| 801 | |
| 802 | /*****************************************************************************/ |
| 803 | /* |
| 804 | * change the permission mask on a key |
| 805 | * - the keyring owned by the changer |
| 806 | * - implements keyctl(KEYCTL_SETPERM) |
| 807 | */ |
| 808 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) |
| 809 | { |
| 810 | struct key *key; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 811 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | long ret; |
| 813 | |
| 814 | ret = -EINVAL; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 815 | if (perm & ~(KEY_POS_ALL | KEY_USR_ALL | KEY_GRP_ALL | KEY_OTH_ALL)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 816 | goto error; |
| 817 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 818 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
| 819 | KEY_SETATTR); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 820 | if (IS_ERR(key_ref)) { |
| 821 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | goto error; |
| 823 | } |
| 824 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 825 | key = key_ref_to_ptr(key_ref); |
| 826 | |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 827 | /* make the changes with the locks held to prevent chown/chmod races */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | ret = -EACCES; |
| 829 | down_write(&key->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 830 | |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 831 | /* if we're not the sysadmin, we can only change a key that we own */ |
David Howells | 47d804b | 2008-11-14 10:39:11 +1100 | [diff] [blame] | 832 | if (capable(CAP_SYS_ADMIN) || key->uid == current_fsuid()) { |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 833 | key->perm = perm; |
| 834 | ret = 0; |
| 835 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 836 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 837 | up_write(&key->sem); |
| 838 | key_put(key); |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 839 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | return ret; |
| 841 | |
| 842 | } /* end keyctl_setperm_key() */ |
| 843 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 844 | /* |
| 845 | * get the destination keyring for instantiation |
| 846 | */ |
| 847 | static long get_instantiation_keyring(key_serial_t ringid, |
| 848 | struct request_key_auth *rka, |
| 849 | struct key **_dest_keyring) |
| 850 | { |
| 851 | key_ref_t dkref; |
| 852 | |
David Howells | eca1bf5 | 2008-12-29 00:41:51 +0000 | [diff] [blame] | 853 | *_dest_keyring = NULL; |
| 854 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 855 | /* just return a NULL pointer if we weren't asked to make a link */ |
David Howells | eca1bf5 | 2008-12-29 00:41:51 +0000 | [diff] [blame] | 856 | if (ringid == 0) |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 857 | return 0; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 858 | |
| 859 | /* if a specific keyring is nominated by ID, then use that */ |
| 860 | if (ringid > 0) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 861 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_WRITE); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 862 | if (IS_ERR(dkref)) |
| 863 | return PTR_ERR(dkref); |
| 864 | *_dest_keyring = key_ref_to_ptr(dkref); |
| 865 | return 0; |
| 866 | } |
| 867 | |
| 868 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) |
| 869 | return -EINVAL; |
| 870 | |
| 871 | /* otherwise specify the destination keyring recorded in the |
| 872 | * authorisation key (any KEY_SPEC_*_KEYRING) */ |
| 873 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { |
David Howells | 21279cf | 2009-10-15 10:14:35 +0100 | [diff] [blame] | 874 | *_dest_keyring = key_get(rka->dest_keyring); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 875 | return 0; |
| 876 | } |
| 877 | |
| 878 | return -ENOKEY; |
| 879 | } |
| 880 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 881 | /* |
| 882 | * change the request_key authorisation key on the current process |
| 883 | */ |
| 884 | static int keyctl_change_reqkey_auth(struct key *key) |
| 885 | { |
| 886 | struct cred *new; |
| 887 | |
| 888 | new = prepare_creds(); |
| 889 | if (!new) |
| 890 | return -ENOMEM; |
| 891 | |
| 892 | key_put(new->request_key_auth); |
| 893 | new->request_key_auth = key_get(key); |
| 894 | |
| 895 | return commit_creds(new); |
| 896 | } |
| 897 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | /*****************************************************************************/ |
| 899 | /* |
| 900 | * instantiate the key with the specified payload, and, if one is given, link |
| 901 | * the key into the keyring |
| 902 | */ |
| 903 | long keyctl_instantiate_key(key_serial_t id, |
| 904 | const void __user *_payload, |
| 905 | size_t plen, |
| 906 | key_serial_t ringid) |
| 907 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 908 | const struct cred *cred = current_cred(); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 909 | struct request_key_auth *rka; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 910 | struct key *instkey, *dest_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | void *payload; |
| 912 | long ret; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 913 | bool vm = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 914 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 915 | kenter("%d,,%zu,%d", id, plen, ringid); |
| 916 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | ret = -EINVAL; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 918 | if (plen > 1024 * 1024 - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | goto error; |
| 920 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 921 | /* the appropriate instantiation authorisation key must have been |
| 922 | * assumed before calling this */ |
| 923 | ret = -EPERM; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 924 | instkey = cred->request_key_auth; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 925 | if (!instkey) |
| 926 | goto error; |
| 927 | |
| 928 | rka = instkey->payload.data; |
| 929 | if (rka->target_key->serial != id) |
| 930 | goto error; |
| 931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | /* pull the payload in if one was supplied */ |
| 933 | payload = NULL; |
| 934 | |
| 935 | if (_payload) { |
| 936 | ret = -ENOMEM; |
| 937 | payload = kmalloc(plen, GFP_KERNEL); |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 938 | if (!payload) { |
| 939 | if (plen <= PAGE_SIZE) |
| 940 | goto error; |
| 941 | vm = true; |
| 942 | payload = vmalloc(plen); |
| 943 | if (!payload) |
| 944 | goto error; |
| 945 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 946 | |
| 947 | ret = -EFAULT; |
| 948 | if (copy_from_user(payload, _payload, plen) != 0) |
| 949 | goto error2; |
| 950 | } |
| 951 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 952 | /* find the destination keyring amongst those belonging to the |
| 953 | * requesting task */ |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 954 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
| 955 | if (ret < 0) |
| 956 | goto error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 957 | |
| 958 | /* instantiate the key and link it into a keyring */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 959 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 960 | dest_keyring, instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 962 | key_put(dest_keyring); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 963 | |
| 964 | /* discard the assumed authority if it's just been disabled by |
| 965 | * instantiation of the key */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 966 | if (ret == 0) |
| 967 | keyctl_change_reqkey_auth(NULL); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 968 | |
| 969 | error2: |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 970 | if (!vm) |
| 971 | kfree(payload); |
| 972 | else |
| 973 | vfree(payload); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 974 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 975 | return ret; |
| 976 | |
| 977 | } /* end keyctl_instantiate_key() */ |
| 978 | |
| 979 | /*****************************************************************************/ |
| 980 | /* |
| 981 | * negatively instantiate the key with the given timeout (in seconds), and, if |
| 982 | * one is given, link the key into the keyring |
| 983 | */ |
| 984 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) |
| 985 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 986 | const struct cred *cred = current_cred(); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 987 | struct request_key_auth *rka; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 988 | struct key *instkey, *dest_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | long ret; |
| 990 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 991 | kenter("%d,%u,%d", id, timeout, ringid); |
| 992 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 993 | /* the appropriate instantiation authorisation key must have been |
| 994 | * assumed before calling this */ |
| 995 | ret = -EPERM; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 996 | instkey = cred->request_key_auth; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 997 | if (!instkey) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 998 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 999 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1000 | rka = instkey->payload.data; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1001 | if (rka->target_key->serial != id) |
| 1002 | goto error; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1003 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | /* find the destination keyring if present (which must also be |
| 1005 | * writable) */ |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1006 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
| 1007 | if (ret < 0) |
| 1008 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | |
| 1010 | /* instantiate the key and link it into a keyring */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 1011 | ret = key_negate_and_link(rka->target_key, timeout, |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1012 | dest_keyring, instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1013 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1014 | key_put(dest_keyring); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1015 | |
| 1016 | /* discard the assumed authority if it's just been disabled by |
| 1017 | * instantiation of the key */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1018 | if (ret == 0) |
| 1019 | keyctl_change_reqkey_auth(NULL); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1020 | |
| 1021 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | return ret; |
| 1023 | |
| 1024 | } /* end keyctl_negate_key() */ |
| 1025 | |
| 1026 | /*****************************************************************************/ |
| 1027 | /* |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1028 | * set the default keyring in which request_key() will cache keys |
| 1029 | * - return the old setting |
| 1030 | */ |
| 1031 | long keyctl_set_reqkey_keyring(int reqkey_defl) |
| 1032 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1033 | struct cred *new; |
| 1034 | int ret, old_setting; |
| 1035 | |
| 1036 | old_setting = current_cred_xxx(jit_keyring); |
| 1037 | |
| 1038 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) |
| 1039 | return old_setting; |
| 1040 | |
| 1041 | new = prepare_creds(); |
| 1042 | if (!new) |
| 1043 | return -ENOMEM; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1044 | |
| 1045 | switch (reqkey_defl) { |
| 1046 | case KEY_REQKEY_DEFL_THREAD_KEYRING: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1047 | ret = install_thread_keyring_to_cred(new); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1048 | if (ret < 0) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1049 | goto error; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1050 | goto set; |
| 1051 | |
| 1052 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1053 | ret = install_process_keyring_to_cred(new); |
| 1054 | if (ret < 0) { |
| 1055 | if (ret != -EEXIST) |
| 1056 | goto error; |
| 1057 | ret = 0; |
| 1058 | } |
| 1059 | goto set; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1060 | |
| 1061 | case KEY_REQKEY_DEFL_DEFAULT: |
| 1062 | case KEY_REQKEY_DEFL_SESSION_KEYRING: |
| 1063 | case KEY_REQKEY_DEFL_USER_KEYRING: |
| 1064 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1065 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
| 1066 | goto set; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1067 | |
| 1068 | case KEY_REQKEY_DEFL_NO_CHANGE: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1069 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
| 1070 | default: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1071 | ret = -EINVAL; |
| 1072 | goto error; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1073 | } |
| 1074 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1075 | set: |
| 1076 | new->jit_keyring = reqkey_defl; |
| 1077 | commit_creds(new); |
| 1078 | return old_setting; |
| 1079 | error: |
| 1080 | abort_creds(new); |
Dan Carpenter | 4303ef1 | 2010-06-11 17:30:05 +0100 | [diff] [blame] | 1081 | return ret; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1082 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1083 | } /* end keyctl_set_reqkey_keyring() */ |
| 1084 | |
| 1085 | /*****************************************************************************/ |
| 1086 | /* |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1087 | * set or clear the timeout for a key |
| 1088 | */ |
| 1089 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) |
| 1090 | { |
| 1091 | struct timespec now; |
David Howells | 9156235 | 2010-06-11 17:31:05 +0100 | [diff] [blame] | 1092 | struct key *key, *instkey; |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1093 | key_ref_t key_ref; |
| 1094 | time_t expiry; |
| 1095 | long ret; |
| 1096 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 1097 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
| 1098 | KEY_SETATTR); |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1099 | if (IS_ERR(key_ref)) { |
David Howells | 9156235 | 2010-06-11 17:31:05 +0100 | [diff] [blame] | 1100 | /* setting the timeout on a key under construction is permitted |
| 1101 | * if we have the authorisation token handy */ |
| 1102 | if (PTR_ERR(key_ref) == -EACCES) { |
| 1103 | instkey = key_get_instantiation_authkey(id); |
| 1104 | if (!IS_ERR(instkey)) { |
| 1105 | key_put(instkey); |
| 1106 | key_ref = lookup_user_key(id, |
| 1107 | KEY_LOOKUP_PARTIAL, |
| 1108 | 0); |
| 1109 | if (!IS_ERR(key_ref)) |
| 1110 | goto okay; |
| 1111 | } |
| 1112 | } |
| 1113 | |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1114 | ret = PTR_ERR(key_ref); |
| 1115 | goto error; |
| 1116 | } |
| 1117 | |
David Howells | 9156235 | 2010-06-11 17:31:05 +0100 | [diff] [blame] | 1118 | okay: |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1119 | key = key_ref_to_ptr(key_ref); |
| 1120 | |
| 1121 | /* make the changes with the locks held to prevent races */ |
| 1122 | down_write(&key->sem); |
| 1123 | |
| 1124 | expiry = 0; |
| 1125 | if (timeout > 0) { |
| 1126 | now = current_kernel_time(); |
| 1127 | expiry = now.tv_sec + timeout; |
| 1128 | } |
| 1129 | |
| 1130 | key->expiry = expiry; |
David Howells | c08ef80 | 2009-09-14 17:26:13 +0100 | [diff] [blame] | 1131 | key_schedule_gc(key->expiry + key_gc_delay); |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1132 | |
| 1133 | up_write(&key->sem); |
| 1134 | key_put(key); |
| 1135 | |
| 1136 | ret = 0; |
| 1137 | error: |
| 1138 | return ret; |
| 1139 | |
| 1140 | } /* end keyctl_set_timeout() */ |
| 1141 | |
| 1142 | /*****************************************************************************/ |
| 1143 | /* |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1144 | * assume the authority to instantiate the specified key |
| 1145 | */ |
| 1146 | long keyctl_assume_authority(key_serial_t id) |
| 1147 | { |
| 1148 | struct key *authkey; |
| 1149 | long ret; |
| 1150 | |
| 1151 | /* special key IDs aren't permitted */ |
| 1152 | ret = -EINVAL; |
| 1153 | if (id < 0) |
| 1154 | goto error; |
| 1155 | |
| 1156 | /* we divest ourselves of authority if given an ID of 0 */ |
| 1157 | if (id == 0) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1158 | ret = keyctl_change_reqkey_auth(NULL); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1159 | goto error; |
| 1160 | } |
| 1161 | |
| 1162 | /* attempt to assume the authority temporarily granted to us whilst we |
| 1163 | * instantiate the specified key |
| 1164 | * - the authorisation key must be in the current task's keyrings |
| 1165 | * somewhere |
| 1166 | */ |
| 1167 | authkey = key_get_instantiation_authkey(id); |
| 1168 | if (IS_ERR(authkey)) { |
| 1169 | ret = PTR_ERR(authkey); |
| 1170 | goto error; |
| 1171 | } |
| 1172 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1173 | ret = keyctl_change_reqkey_auth(authkey); |
| 1174 | if (ret < 0) |
| 1175 | goto error; |
| 1176 | key_put(authkey); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1177 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1178 | ret = authkey->serial; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1179 | error: |
| 1180 | return ret; |
| 1181 | |
| 1182 | } /* end keyctl_assume_authority() */ |
| 1183 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1184 | /* |
| 1185 | * get the security label of a key |
| 1186 | * - the key must grant us view permission |
| 1187 | * - if there's a buffer, we place up to buflen bytes of data into it |
| 1188 | * - unless there's an error, we return the amount of information available, |
| 1189 | * irrespective of how much we may have copied (including the terminal NUL) |
| 1190 | * - implements keyctl(KEYCTL_GET_SECURITY) |
| 1191 | */ |
| 1192 | long keyctl_get_security(key_serial_t keyid, |
| 1193 | char __user *buffer, |
| 1194 | size_t buflen) |
| 1195 | { |
| 1196 | struct key *key, *instkey; |
| 1197 | key_ref_t key_ref; |
| 1198 | char *context; |
| 1199 | long ret; |
| 1200 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 1201 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_VIEW); |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1202 | if (IS_ERR(key_ref)) { |
| 1203 | if (PTR_ERR(key_ref) != -EACCES) |
| 1204 | return PTR_ERR(key_ref); |
| 1205 | |
| 1206 | /* viewing a key under construction is also permitted if we |
| 1207 | * have the authorisation token handy */ |
| 1208 | instkey = key_get_instantiation_authkey(keyid); |
| 1209 | if (IS_ERR(instkey)) |
Roel Kluin | fa1cc7b | 2009-12-15 15:05:12 -0800 | [diff] [blame] | 1210 | return PTR_ERR(instkey); |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1211 | key_put(instkey); |
| 1212 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 1213 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1214 | if (IS_ERR(key_ref)) |
| 1215 | return PTR_ERR(key_ref); |
| 1216 | } |
| 1217 | |
| 1218 | key = key_ref_to_ptr(key_ref); |
| 1219 | ret = security_key_getsecurity(key, &context); |
| 1220 | if (ret == 0) { |
| 1221 | /* if no information was returned, give userspace an empty |
| 1222 | * string */ |
| 1223 | ret = 1; |
| 1224 | if (buffer && buflen > 0 && |
| 1225 | copy_to_user(buffer, "", 1) != 0) |
| 1226 | ret = -EFAULT; |
| 1227 | } else if (ret > 0) { |
| 1228 | /* return as much data as there's room for */ |
| 1229 | if (buffer && buflen > 0) { |
| 1230 | if (buflen > ret) |
| 1231 | buflen = ret; |
| 1232 | |
| 1233 | if (copy_to_user(buffer, context, buflen) != 0) |
| 1234 | ret = -EFAULT; |
| 1235 | } |
| 1236 | |
| 1237 | kfree(context); |
| 1238 | } |
| 1239 | |
| 1240 | key_ref_put(key_ref); |
| 1241 | return ret; |
| 1242 | } |
| 1243 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1244 | /* |
| 1245 | * attempt to install the calling process's session keyring on the process's |
| 1246 | * parent process |
| 1247 | * - the keyring must exist and must grant us LINK permission |
| 1248 | * - implements keyctl(KEYCTL_SESSION_TO_PARENT) |
| 1249 | */ |
| 1250 | long keyctl_session_to_parent(void) |
| 1251 | { |
Geert Uytterhoeven | a00ae4d | 2009-12-13 20:21:34 +0100 | [diff] [blame] | 1252 | #ifdef TIF_NOTIFY_RESUME |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1253 | struct task_struct *me, *parent; |
| 1254 | const struct cred *mycred, *pcred; |
| 1255 | struct cred *cred, *oldcred; |
| 1256 | key_ref_t keyring_r; |
| 1257 | int ret; |
| 1258 | |
| 1259 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_LINK); |
| 1260 | if (IS_ERR(keyring_r)) |
| 1261 | return PTR_ERR(keyring_r); |
| 1262 | |
| 1263 | /* our parent is going to need a new cred struct, a new tgcred struct |
| 1264 | * and new security data, so we allocate them here to prevent ENOMEM in |
| 1265 | * our parent */ |
| 1266 | ret = -ENOMEM; |
| 1267 | cred = cred_alloc_blank(); |
| 1268 | if (!cred) |
| 1269 | goto error_keyring; |
| 1270 | |
| 1271 | cred->tgcred->session_keyring = key_ref_to_ptr(keyring_r); |
| 1272 | keyring_r = NULL; |
| 1273 | |
| 1274 | me = current; |
| 1275 | write_lock_irq(&tasklist_lock); |
| 1276 | |
| 1277 | parent = me->real_parent; |
| 1278 | ret = -EPERM; |
| 1279 | |
| 1280 | /* the parent mustn't be init and mustn't be a kernel thread */ |
| 1281 | if (parent->pid <= 1 || !parent->mm) |
| 1282 | goto not_permitted; |
| 1283 | |
| 1284 | /* the parent must be single threaded */ |
Oleg Nesterov | dd98acf | 2010-05-26 14:43:23 -0700 | [diff] [blame] | 1285 | if (!thread_group_empty(parent)) |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1286 | goto not_permitted; |
| 1287 | |
| 1288 | /* the parent and the child must have different session keyrings or |
| 1289 | * there's no point */ |
| 1290 | mycred = current_cred(); |
| 1291 | pcred = __task_cred(parent); |
| 1292 | if (mycred == pcred || |
| 1293 | mycred->tgcred->session_keyring == pcred->tgcred->session_keyring) |
| 1294 | goto already_same; |
| 1295 | |
| 1296 | /* the parent must have the same effective ownership and mustn't be |
| 1297 | * SUID/SGID */ |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 1298 | if (pcred->uid != mycred->euid || |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1299 | pcred->euid != mycred->euid || |
| 1300 | pcred->suid != mycred->euid || |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 1301 | pcred->gid != mycred->egid || |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1302 | pcred->egid != mycred->egid || |
| 1303 | pcred->sgid != mycred->egid) |
| 1304 | goto not_permitted; |
| 1305 | |
| 1306 | /* the keyrings must have the same UID */ |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 1307 | if (pcred->tgcred->session_keyring->uid != mycred->euid || |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1308 | mycred->tgcred->session_keyring->uid != mycred->euid) |
| 1309 | goto not_permitted; |
| 1310 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1311 | /* if there's an already pending keyring replacement, then we replace |
| 1312 | * that */ |
| 1313 | oldcred = parent->replacement_session_keyring; |
| 1314 | |
| 1315 | /* the replacement session keyring is applied just prior to userspace |
| 1316 | * restarting */ |
| 1317 | parent->replacement_session_keyring = cred; |
| 1318 | cred = NULL; |
| 1319 | set_ti_thread_flag(task_thread_info(parent), TIF_NOTIFY_RESUME); |
| 1320 | |
| 1321 | write_unlock_irq(&tasklist_lock); |
| 1322 | if (oldcred) |
| 1323 | put_cred(oldcred); |
| 1324 | return 0; |
| 1325 | |
| 1326 | already_same: |
| 1327 | ret = 0; |
| 1328 | not_permitted: |
Marc Dionne | 5c84342 | 2009-09-14 12:46:23 +0100 | [diff] [blame] | 1329 | write_unlock_irq(&tasklist_lock); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1330 | put_cred(cred); |
| 1331 | return ret; |
| 1332 | |
| 1333 | error_keyring: |
| 1334 | key_ref_put(keyring_r); |
| 1335 | return ret; |
Geert Uytterhoeven | a00ae4d | 2009-12-13 20:21:34 +0100 | [diff] [blame] | 1336 | |
| 1337 | #else /* !TIF_NOTIFY_RESUME */ |
| 1338 | /* |
| 1339 | * To be removed when TIF_NOTIFY_RESUME has been implemented on |
| 1340 | * m68k/xtensa |
| 1341 | */ |
| 1342 | #warning TIF_NOTIFY_RESUME not implemented |
| 1343 | return -EOPNOTSUPP; |
| 1344 | #endif /* !TIF_NOTIFY_RESUME */ |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1345 | } |
| 1346 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1347 | /*****************************************************************************/ |
| 1348 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1349 | * the key control system call |
| 1350 | */ |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1351 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
| 1352 | unsigned long, arg4, unsigned long, arg5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1353 | { |
| 1354 | switch (option) { |
| 1355 | case KEYCTL_GET_KEYRING_ID: |
| 1356 | return keyctl_get_keyring_ID((key_serial_t) arg2, |
| 1357 | (int) arg3); |
| 1358 | |
| 1359 | case KEYCTL_JOIN_SESSION_KEYRING: |
| 1360 | return keyctl_join_session_keyring((const char __user *) arg2); |
| 1361 | |
| 1362 | case KEYCTL_UPDATE: |
| 1363 | return keyctl_update_key((key_serial_t) arg2, |
| 1364 | (const void __user *) arg3, |
| 1365 | (size_t) arg4); |
| 1366 | |
| 1367 | case KEYCTL_REVOKE: |
| 1368 | return keyctl_revoke_key((key_serial_t) arg2); |
| 1369 | |
| 1370 | case KEYCTL_DESCRIBE: |
| 1371 | return keyctl_describe_key((key_serial_t) arg2, |
| 1372 | (char __user *) arg3, |
| 1373 | (unsigned) arg4); |
| 1374 | |
| 1375 | case KEYCTL_CLEAR: |
| 1376 | return keyctl_keyring_clear((key_serial_t) arg2); |
| 1377 | |
| 1378 | case KEYCTL_LINK: |
| 1379 | return keyctl_keyring_link((key_serial_t) arg2, |
| 1380 | (key_serial_t) arg3); |
| 1381 | |
| 1382 | case KEYCTL_UNLINK: |
| 1383 | return keyctl_keyring_unlink((key_serial_t) arg2, |
| 1384 | (key_serial_t) arg3); |
| 1385 | |
| 1386 | case KEYCTL_SEARCH: |
| 1387 | return keyctl_keyring_search((key_serial_t) arg2, |
| 1388 | (const char __user *) arg3, |
| 1389 | (const char __user *) arg4, |
| 1390 | (key_serial_t) arg5); |
| 1391 | |
| 1392 | case KEYCTL_READ: |
| 1393 | return keyctl_read_key((key_serial_t) arg2, |
| 1394 | (char __user *) arg3, |
| 1395 | (size_t) arg4); |
| 1396 | |
| 1397 | case KEYCTL_CHOWN: |
| 1398 | return keyctl_chown_key((key_serial_t) arg2, |
| 1399 | (uid_t) arg3, |
| 1400 | (gid_t) arg4); |
| 1401 | |
| 1402 | case KEYCTL_SETPERM: |
| 1403 | return keyctl_setperm_key((key_serial_t) arg2, |
| 1404 | (key_perm_t) arg3); |
| 1405 | |
| 1406 | case KEYCTL_INSTANTIATE: |
| 1407 | return keyctl_instantiate_key((key_serial_t) arg2, |
| 1408 | (const void __user *) arg3, |
| 1409 | (size_t) arg4, |
| 1410 | (key_serial_t) arg5); |
| 1411 | |
| 1412 | case KEYCTL_NEGATE: |
| 1413 | return keyctl_negate_key((key_serial_t) arg2, |
| 1414 | (unsigned) arg3, |
| 1415 | (key_serial_t) arg4); |
| 1416 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1417 | case KEYCTL_SET_REQKEY_KEYRING: |
| 1418 | return keyctl_set_reqkey_keyring(arg2); |
| 1419 | |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1420 | case KEYCTL_SET_TIMEOUT: |
| 1421 | return keyctl_set_timeout((key_serial_t) arg2, |
| 1422 | (unsigned) arg3); |
| 1423 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1424 | case KEYCTL_ASSUME_AUTHORITY: |
| 1425 | return keyctl_assume_authority((key_serial_t) arg2); |
| 1426 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1427 | case KEYCTL_GET_SECURITY: |
| 1428 | return keyctl_get_security((key_serial_t) arg2, |
James Morris | 90bd49a | 2008-12-29 14:35:35 +1100 | [diff] [blame] | 1429 | (char __user *) arg3, |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1430 | (size_t) arg4); |
| 1431 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1432 | case KEYCTL_SESSION_TO_PARENT: |
| 1433 | return keyctl_session_to_parent(); |
| 1434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | default: |
| 1436 | return -EOPNOTSUPP; |
| 1437 | } |
| 1438 | |
| 1439 | } /* end sys_keyctl() */ |