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> |
| 19 | #include <linux/err.h> |
| 20 | #include <asm/uaccess.h> |
| 21 | #include "internal.h" |
| 22 | |
| 23 | /*****************************************************************************/ |
| 24 | /* |
| 25 | * extract the description of a new key from userspace and either add it as a |
| 26 | * new key to the specified keyring or update a matching key in that keyring |
| 27 | * - the keyring must be writable |
| 28 | * - returns the new key's serial number |
| 29 | * - implements add_key() |
| 30 | */ |
| 31 | asmlinkage long sys_add_key(const char __user *_type, |
| 32 | const char __user *_description, |
| 33 | const void __user *_payload, |
| 34 | size_t plen, |
| 35 | key_serial_t ringid) |
| 36 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 37 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | char type[32], *description; |
| 39 | void *payload; |
| 40 | long dlen, ret; |
| 41 | |
| 42 | ret = -EINVAL; |
| 43 | if (plen > 32767) |
| 44 | goto error; |
| 45 | |
| 46 | /* draw all the data into kernel space */ |
| 47 | ret = strncpy_from_user(type, _type, sizeof(type) - 1); |
| 48 | if (ret < 0) |
| 49 | goto error; |
| 50 | type[31] = '\0'; |
| 51 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 52 | ret = -EPERM; |
| 53 | if (type[0] == '.') |
| 54 | goto error; |
| 55 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | ret = -EFAULT; |
| 57 | dlen = strnlen_user(_description, PAGE_SIZE - 1); |
| 58 | if (dlen <= 0) |
| 59 | goto error; |
| 60 | |
| 61 | ret = -EINVAL; |
| 62 | if (dlen > PAGE_SIZE - 1) |
| 63 | goto error; |
| 64 | |
| 65 | ret = -ENOMEM; |
| 66 | description = kmalloc(dlen + 1, GFP_KERNEL); |
| 67 | if (!description) |
| 68 | goto error; |
| 69 | |
| 70 | ret = -EFAULT; |
| 71 | if (copy_from_user(description, _description, dlen + 1) != 0) |
| 72 | goto error2; |
| 73 | |
| 74 | /* pull the payload in if one was supplied */ |
| 75 | payload = NULL; |
| 76 | |
| 77 | if (_payload) { |
| 78 | ret = -ENOMEM; |
| 79 | payload = kmalloc(plen, GFP_KERNEL); |
| 80 | if (!payload) |
| 81 | goto error2; |
| 82 | |
| 83 | ret = -EFAULT; |
| 84 | if (copy_from_user(payload, _payload, plen) != 0) |
| 85 | goto error3; |
| 86 | } |
| 87 | |
| 88 | /* find the target keyring (which must be writable) */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 89 | keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE); |
| 90 | if (IS_ERR(keyring_ref)) { |
| 91 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | goto error3; |
| 93 | } |
| 94 | |
| 95 | /* create or update the requested key and add it to the target |
| 96 | * keyring */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 97 | key_ref = key_create_or_update(keyring_ref, type, description, |
| 98 | payload, plen, 0); |
| 99 | if (!IS_ERR(key_ref)) { |
| 100 | ret = key_ref_to_ptr(key_ref)->serial; |
| 101 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | } |
| 103 | else { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 104 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | } |
| 106 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 107 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | error3: |
| 109 | kfree(payload); |
| 110 | error2: |
| 111 | kfree(description); |
| 112 | error: |
| 113 | return ret; |
| 114 | |
| 115 | } /* end sys_add_key() */ |
| 116 | |
| 117 | /*****************************************************************************/ |
| 118 | /* |
| 119 | * search the process keyrings for a matching key |
| 120 | * - nested keyrings may also be searched if they have Search permission |
| 121 | * - if a key is found, it will be attached to the destination keyring if |
| 122 | * there's one specified |
| 123 | * - /sbin/request-key will be invoked if _callout_info is non-NULL |
| 124 | * - the _callout_info string will be passed to /sbin/request-key |
| 125 | * - if the _callout_info string is empty, it will be rendered as "-" |
| 126 | * - implements request_key() |
| 127 | */ |
| 128 | asmlinkage long sys_request_key(const char __user *_type, |
| 129 | const char __user *_description, |
| 130 | const char __user *_callout_info, |
| 131 | key_serial_t destringid) |
| 132 | { |
| 133 | struct key_type *ktype; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 134 | struct key *key; |
| 135 | key_ref_t dest_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | char type[32], *description, *callout_info; |
| 137 | long dlen, ret; |
| 138 | |
| 139 | /* pull the type into kernel space */ |
| 140 | ret = strncpy_from_user(type, _type, sizeof(type) - 1); |
| 141 | if (ret < 0) |
| 142 | goto error; |
| 143 | type[31] = '\0'; |
| 144 | |
David Howells | 1260f80 | 2005-08-04 11:50:01 +0100 | [diff] [blame] | 145 | ret = -EPERM; |
| 146 | if (type[0] == '.') |
| 147 | goto error; |
| 148 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | /* pull the description into kernel space */ |
| 150 | ret = -EFAULT; |
| 151 | dlen = strnlen_user(_description, PAGE_SIZE - 1); |
| 152 | if (dlen <= 0) |
| 153 | goto error; |
| 154 | |
| 155 | ret = -EINVAL; |
| 156 | if (dlen > PAGE_SIZE - 1) |
| 157 | goto error; |
| 158 | |
| 159 | ret = -ENOMEM; |
| 160 | description = kmalloc(dlen + 1, GFP_KERNEL); |
| 161 | if (!description) |
| 162 | goto error; |
| 163 | |
| 164 | ret = -EFAULT; |
| 165 | if (copy_from_user(description, _description, dlen + 1) != 0) |
| 166 | goto error2; |
| 167 | |
| 168 | /* pull the callout info into kernel space */ |
| 169 | callout_info = NULL; |
| 170 | if (_callout_info) { |
| 171 | ret = -EFAULT; |
| 172 | dlen = strnlen_user(_callout_info, PAGE_SIZE - 1); |
| 173 | if (dlen <= 0) |
| 174 | goto error2; |
| 175 | |
| 176 | ret = -EINVAL; |
| 177 | if (dlen > PAGE_SIZE - 1) |
| 178 | goto error2; |
| 179 | |
| 180 | ret = -ENOMEM; |
| 181 | callout_info = kmalloc(dlen + 1, GFP_KERNEL); |
| 182 | if (!callout_info) |
| 183 | goto error2; |
| 184 | |
| 185 | ret = -EFAULT; |
| 186 | if (copy_from_user(callout_info, _callout_info, dlen + 1) != 0) |
| 187 | goto error3; |
| 188 | } |
| 189 | |
| 190 | /* get the destination keyring if specified */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 191 | dest_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | if (destringid) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 193 | dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE); |
| 194 | if (IS_ERR(dest_ref)) { |
| 195 | ret = PTR_ERR(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | goto error3; |
| 197 | } |
| 198 | } |
| 199 | |
| 200 | /* find the key type */ |
| 201 | ktype = key_type_lookup(type); |
| 202 | if (IS_ERR(ktype)) { |
| 203 | ret = PTR_ERR(ktype); |
| 204 | goto error4; |
| 205 | } |
| 206 | |
| 207 | /* do the search */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 208 | key = request_key_and_link(ktype, description, callout_info, |
| 209 | key_ref_to_ptr(dest_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | if (IS_ERR(key)) { |
| 211 | ret = PTR_ERR(key); |
| 212 | goto error5; |
| 213 | } |
| 214 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | ret = key->serial; |
| 216 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 217 | key_put(key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | error5: |
| 219 | key_type_put(ktype); |
| 220 | error4: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 221 | key_ref_put(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | error3: |
| 223 | kfree(callout_info); |
| 224 | error2: |
| 225 | kfree(description); |
| 226 | error: |
| 227 | return ret; |
| 228 | |
| 229 | } /* end sys_request_key() */ |
| 230 | |
| 231 | /*****************************************************************************/ |
| 232 | /* |
| 233 | * get the ID of the specified process keyring |
| 234 | * - the keyring must have search permission to be found |
| 235 | * - implements keyctl(KEYCTL_GET_KEYRING_ID) |
| 236 | */ |
| 237 | long keyctl_get_keyring_ID(key_serial_t id, int create) |
| 238 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 239 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 240 | long ret; |
| 241 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 242 | key_ref = lookup_user_key(NULL, id, create, 0, KEY_SEARCH); |
| 243 | if (IS_ERR(key_ref)) { |
| 244 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | goto error; |
| 246 | } |
| 247 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 248 | ret = key_ref_to_ptr(key_ref)->serial; |
| 249 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | error: |
| 251 | return ret; |
| 252 | |
| 253 | } /* end keyctl_get_keyring_ID() */ |
| 254 | |
| 255 | /*****************************************************************************/ |
| 256 | /* |
| 257 | * join the session keyring |
| 258 | * - implements keyctl(KEYCTL_JOIN_SESSION_KEYRING) |
| 259 | */ |
| 260 | long keyctl_join_session_keyring(const char __user *_name) |
| 261 | { |
| 262 | char *name; |
| 263 | long nlen, ret; |
| 264 | |
| 265 | /* fetch the name from userspace */ |
| 266 | name = NULL; |
| 267 | if (_name) { |
| 268 | ret = -EFAULT; |
| 269 | nlen = strnlen_user(_name, PAGE_SIZE - 1); |
| 270 | if (nlen <= 0) |
| 271 | goto error; |
| 272 | |
| 273 | ret = -EINVAL; |
| 274 | if (nlen > PAGE_SIZE - 1) |
| 275 | goto error; |
| 276 | |
| 277 | ret = -ENOMEM; |
| 278 | name = kmalloc(nlen + 1, GFP_KERNEL); |
| 279 | if (!name) |
| 280 | goto error; |
| 281 | |
| 282 | ret = -EFAULT; |
| 283 | if (copy_from_user(name, _name, nlen + 1) != 0) |
| 284 | goto error2; |
| 285 | } |
| 286 | |
| 287 | /* join the session */ |
| 288 | ret = join_session_keyring(name); |
| 289 | |
| 290 | error2: |
| 291 | kfree(name); |
| 292 | error: |
| 293 | return ret; |
| 294 | |
| 295 | } /* end keyctl_join_session_keyring() */ |
| 296 | |
| 297 | /*****************************************************************************/ |
| 298 | /* |
| 299 | * update a key's data payload |
| 300 | * - the key must be writable |
| 301 | * - implements keyctl(KEYCTL_UPDATE) |
| 302 | */ |
| 303 | long keyctl_update_key(key_serial_t id, |
| 304 | const void __user *_payload, |
| 305 | size_t plen) |
| 306 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 307 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | void *payload; |
| 309 | long ret; |
| 310 | |
| 311 | ret = -EINVAL; |
| 312 | if (plen > PAGE_SIZE) |
| 313 | goto error; |
| 314 | |
| 315 | /* pull the payload in if one was supplied */ |
| 316 | payload = NULL; |
| 317 | if (_payload) { |
| 318 | ret = -ENOMEM; |
| 319 | payload = kmalloc(plen, GFP_KERNEL); |
| 320 | if (!payload) |
| 321 | goto error; |
| 322 | |
| 323 | ret = -EFAULT; |
| 324 | if (copy_from_user(payload, _payload, plen) != 0) |
| 325 | goto error2; |
| 326 | } |
| 327 | |
| 328 | /* find the target key (which must be writable) */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 329 | key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE); |
| 330 | if (IS_ERR(key_ref)) { |
| 331 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | goto error2; |
| 333 | } |
| 334 | |
| 335 | /* update the key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 336 | ret = key_update(key_ref, payload, plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 338 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | error2: |
| 340 | kfree(payload); |
| 341 | error: |
| 342 | return ret; |
| 343 | |
| 344 | } /* end keyctl_update_key() */ |
| 345 | |
| 346 | /*****************************************************************************/ |
| 347 | /* |
| 348 | * revoke a key |
| 349 | * - the key must be writable |
| 350 | * - implements keyctl(KEYCTL_REVOKE) |
| 351 | */ |
| 352 | long keyctl_revoke_key(key_serial_t id) |
| 353 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 354 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | long ret; |
| 356 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 357 | key_ref = lookup_user_key(NULL, id, 0, 0, KEY_WRITE); |
| 358 | if (IS_ERR(key_ref)) { |
| 359 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | goto error; |
| 361 | } |
| 362 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 363 | key_revoke(key_ref_to_ptr(key_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | ret = 0; |
| 365 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 366 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | error: |
David Howells | 1260f80 | 2005-08-04 11:50:01 +0100 | [diff] [blame] | 368 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | } /* end keyctl_revoke_key() */ |
| 371 | |
| 372 | /*****************************************************************************/ |
| 373 | /* |
| 374 | * clear the specified process keyring |
| 375 | * - the keyring must be writable |
| 376 | * - implements keyctl(KEYCTL_CLEAR) |
| 377 | */ |
| 378 | long keyctl_keyring_clear(key_serial_t ringid) |
| 379 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 380 | key_ref_t keyring_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | long ret; |
| 382 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 383 | keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE); |
| 384 | if (IS_ERR(keyring_ref)) { |
| 385 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | goto error; |
| 387 | } |
| 388 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 389 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 391 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | error: |
| 393 | return ret; |
| 394 | |
| 395 | } /* end keyctl_keyring_clear() */ |
| 396 | |
| 397 | /*****************************************************************************/ |
| 398 | /* |
| 399 | * link a key into a keyring |
| 400 | * - the keyring must be writable |
| 401 | * - the key must be linkable |
| 402 | * - implements keyctl(KEYCTL_LINK) |
| 403 | */ |
| 404 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) |
| 405 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 406 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | long ret; |
| 408 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 409 | keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE); |
| 410 | if (IS_ERR(keyring_ref)) { |
| 411 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | goto error; |
| 413 | } |
| 414 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 415 | key_ref = lookup_user_key(NULL, id, 1, 0, KEY_LINK); |
| 416 | if (IS_ERR(key_ref)) { |
| 417 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | goto error2; |
| 419 | } |
| 420 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 421 | 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] | 422 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 423 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 425 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | error: |
| 427 | return ret; |
| 428 | |
| 429 | } /* end keyctl_keyring_link() */ |
| 430 | |
| 431 | /*****************************************************************************/ |
| 432 | /* |
| 433 | * unlink the first attachment of a key from a keyring |
| 434 | * - the keyring must be writable |
| 435 | * - we don't need any permissions on the key |
| 436 | * - implements keyctl(KEYCTL_UNLINK) |
| 437 | */ |
| 438 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) |
| 439 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 440 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | long ret; |
| 442 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 443 | keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_WRITE); |
| 444 | if (IS_ERR(keyring_ref)) { |
| 445 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | goto error; |
| 447 | } |
| 448 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 449 | key_ref = lookup_user_key(NULL, id, 0, 0, 0); |
| 450 | if (IS_ERR(key_ref)) { |
| 451 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | goto error2; |
| 453 | } |
| 454 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 455 | 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] | 456 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 457 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 459 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | error: |
| 461 | return ret; |
| 462 | |
| 463 | } /* end keyctl_keyring_unlink() */ |
| 464 | |
| 465 | /*****************************************************************************/ |
| 466 | /* |
| 467 | * describe a user key |
| 468 | * - the key must have view permission |
| 469 | * - if there's a buffer, we place up to buflen bytes of data into it |
| 470 | * - unless there's an error, we return the amount of description available, |
| 471 | * irrespective of how much we may have copied |
| 472 | * - the description is formatted thus: |
| 473 | * type;uid;gid;perm;description<NUL> |
| 474 | * - implements keyctl(KEYCTL_DESCRIBE) |
| 475 | */ |
| 476 | long keyctl_describe_key(key_serial_t keyid, |
| 477 | char __user *buffer, |
| 478 | size_t buflen) |
| 479 | { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 480 | struct key *key, *instkey; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 481 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | char *tmpbuf; |
| 483 | long ret; |
| 484 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 485 | key_ref = lookup_user_key(NULL, keyid, 0, 1, KEY_VIEW); |
| 486 | if (IS_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 487 | /* viewing a key under construction is permitted if we have the |
| 488 | * authorisation token handy */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 489 | if (PTR_ERR(key_ref) == -EACCES) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 490 | instkey = key_get_instantiation_authkey(keyid); |
| 491 | if (!IS_ERR(instkey)) { |
| 492 | key_put(instkey); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 493 | key_ref = lookup_user_key(NULL, keyid, |
| 494 | 0, 1, 0); |
| 495 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 496 | goto okay; |
| 497 | } |
| 498 | } |
| 499 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 500 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | goto error; |
| 502 | } |
| 503 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 504 | okay: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 505 | /* calculate how much description we're going to return */ |
| 506 | ret = -ENOMEM; |
| 507 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 508 | if (!tmpbuf) |
| 509 | goto error2; |
| 510 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 511 | key = key_ref_to_ptr(key_ref); |
| 512 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 514 | "%s;%d;%d;%08x;%s", |
| 515 | key_ref_to_ptr(key_ref)->type->name, |
| 516 | key_ref_to_ptr(key_ref)->uid, |
| 517 | key_ref_to_ptr(key_ref)->gid, |
| 518 | key_ref_to_ptr(key_ref)->perm, |
| 519 | key_ref_to_ptr(key_ref)->description ? |
| 520 | key_ref_to_ptr(key_ref)->description : "" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | ); |
| 522 | |
| 523 | /* include a NUL char at the end of the data */ |
| 524 | if (ret > PAGE_SIZE - 1) |
| 525 | ret = PAGE_SIZE - 1; |
| 526 | tmpbuf[ret] = 0; |
| 527 | ret++; |
| 528 | |
| 529 | /* consider returning the data */ |
| 530 | if (buffer && buflen > 0) { |
| 531 | if (buflen > ret) |
| 532 | buflen = ret; |
| 533 | |
| 534 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) |
| 535 | ret = -EFAULT; |
| 536 | } |
| 537 | |
| 538 | kfree(tmpbuf); |
| 539 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 540 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 541 | error: |
| 542 | return ret; |
| 543 | |
| 544 | } /* end keyctl_describe_key() */ |
| 545 | |
| 546 | /*****************************************************************************/ |
| 547 | /* |
| 548 | * search the specified keyring for a matching key |
| 549 | * - the start keyring must be searchable |
| 550 | * - nested keyrings may also be searched if they are searchable |
| 551 | * - only keys with search permission may be found |
| 552 | * - if a key is found, it will be attached to the destination keyring if |
| 553 | * there's one specified |
| 554 | * - implements keyctl(KEYCTL_SEARCH) |
| 555 | */ |
| 556 | long keyctl_keyring_search(key_serial_t ringid, |
| 557 | const char __user *_type, |
| 558 | const char __user *_description, |
| 559 | key_serial_t destringid) |
| 560 | { |
| 561 | struct key_type *ktype; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 562 | key_ref_t keyring_ref, key_ref, dest_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | char type[32], *description; |
| 564 | long dlen, ret; |
| 565 | |
| 566 | /* pull the type and description into kernel space */ |
| 567 | ret = strncpy_from_user(type, _type, sizeof(type) - 1); |
| 568 | if (ret < 0) |
| 569 | goto error; |
| 570 | type[31] = '\0'; |
| 571 | |
| 572 | ret = -EFAULT; |
| 573 | dlen = strnlen_user(_description, PAGE_SIZE - 1); |
| 574 | if (dlen <= 0) |
| 575 | goto error; |
| 576 | |
| 577 | ret = -EINVAL; |
| 578 | if (dlen > PAGE_SIZE - 1) |
| 579 | goto error; |
| 580 | |
| 581 | ret = -ENOMEM; |
| 582 | description = kmalloc(dlen + 1, GFP_KERNEL); |
| 583 | if (!description) |
| 584 | goto error; |
| 585 | |
| 586 | ret = -EFAULT; |
| 587 | if (copy_from_user(description, _description, dlen + 1) != 0) |
| 588 | goto error2; |
| 589 | |
| 590 | /* get the keyring at which to begin the search */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 591 | keyring_ref = lookup_user_key(NULL, ringid, 0, 0, KEY_SEARCH); |
| 592 | if (IS_ERR(keyring_ref)) { |
| 593 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | goto error2; |
| 595 | } |
| 596 | |
| 597 | /* get the destination keyring if specified */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 598 | dest_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | if (destringid) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 600 | dest_ref = lookup_user_key(NULL, destringid, 1, 0, KEY_WRITE); |
| 601 | if (IS_ERR(dest_ref)) { |
| 602 | ret = PTR_ERR(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | goto error3; |
| 604 | } |
| 605 | } |
| 606 | |
| 607 | /* find the key type */ |
| 608 | ktype = key_type_lookup(type); |
| 609 | if (IS_ERR(ktype)) { |
| 610 | ret = PTR_ERR(ktype); |
| 611 | goto error4; |
| 612 | } |
| 613 | |
| 614 | /* do the search */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 615 | key_ref = keyring_search(keyring_ref, ktype, description); |
| 616 | if (IS_ERR(key_ref)) { |
| 617 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | |
| 619 | /* treat lack or presence of a negative key the same */ |
| 620 | if (ret == -EAGAIN) |
| 621 | ret = -ENOKEY; |
| 622 | goto error5; |
| 623 | } |
| 624 | |
| 625 | /* link the resulting key to the destination keyring if we can */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 626 | if (dest_ref) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | ret = -EACCES; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 628 | if (!key_permission(key_ref, KEY_LINK)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | goto error6; |
| 630 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 631 | 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] | 632 | if (ret < 0) |
| 633 | goto error6; |
| 634 | } |
| 635 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 636 | ret = key_ref_to_ptr(key_ref)->serial; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | |
| 638 | error6: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 639 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | error5: |
| 641 | key_type_put(ktype); |
| 642 | error4: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 643 | key_ref_put(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | error3: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 645 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 646 | error2: |
| 647 | kfree(description); |
| 648 | error: |
| 649 | return ret; |
| 650 | |
| 651 | } /* end keyctl_keyring_search() */ |
| 652 | |
| 653 | /*****************************************************************************/ |
| 654 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | * read a user key's payload |
| 656 | * - the keyring must be readable or the key must be searchable from the |
| 657 | * process's keyrings |
| 658 | * - if there's a buffer, we place up to buflen bytes of data into it |
| 659 | * - unless there's an error, we return the amount of data in the key, |
| 660 | * irrespective of how much we may have copied |
| 661 | * - implements keyctl(KEYCTL_READ) |
| 662 | */ |
| 663 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) |
| 664 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 665 | struct key *key; |
| 666 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | long ret; |
| 668 | |
| 669 | /* find the key first */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 670 | key_ref = lookup_user_key(NULL, keyid, 0, 0, 0); |
| 671 | if (IS_ERR(key_ref)) { |
| 672 | ret = -ENOKEY; |
| 673 | goto error; |
| 674 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 676 | key = key_ref_to_ptr(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 678 | /* see if we can read it directly */ |
| 679 | if (key_permission(key_ref, KEY_READ)) |
| 680 | goto can_read_key; |
| 681 | |
| 682 | /* we can't; see if it's searchable from this process's keyrings |
| 683 | * - we automatically take account of the fact that it may be |
| 684 | * dangling off an instantiation key |
| 685 | */ |
| 686 | if (!is_key_possessed(key_ref)) { |
| 687 | ret = -EACCES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | goto error2; |
| 689 | } |
| 690 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | /* the key is probably readable - now try to read it */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | can_read_key: |
| 693 | ret = key_validate(key); |
| 694 | if (ret == 0) { |
| 695 | ret = -EOPNOTSUPP; |
| 696 | if (key->type->read) { |
| 697 | /* read the data with the semaphore held (since we |
| 698 | * might sleep) */ |
| 699 | down_read(&key->sem); |
| 700 | ret = key->type->read(key, buffer, buflen); |
| 701 | up_read(&key->sem); |
| 702 | } |
| 703 | } |
| 704 | |
| 705 | error2: |
| 706 | key_put(key); |
| 707 | error: |
| 708 | return ret; |
| 709 | |
| 710 | } /* end keyctl_read_key() */ |
| 711 | |
| 712 | /*****************************************************************************/ |
| 713 | /* |
| 714 | * change the ownership of a key |
| 715 | * - the keyring owned by the changer |
| 716 | * - if the uid or gid is -1, then that parameter is not changed |
| 717 | * - implements keyctl(KEYCTL_CHOWN) |
| 718 | */ |
| 719 | long keyctl_chown_key(key_serial_t id, uid_t uid, gid_t gid) |
| 720 | { |
| 721 | struct key *key; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 722 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | long ret; |
| 724 | |
| 725 | ret = 0; |
| 726 | if (uid == (uid_t) -1 && gid == (gid_t) -1) |
| 727 | goto error; |
| 728 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 729 | key_ref = lookup_user_key(NULL, id, 1, 1, 0); |
| 730 | if (IS_ERR(key_ref)) { |
| 731 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | goto error; |
| 733 | } |
| 734 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 735 | key = key_ref_to_ptr(key_ref); |
| 736 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | /* make the changes with the locks held to prevent chown/chown races */ |
| 738 | ret = -EACCES; |
| 739 | down_write(&key->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 740 | |
| 741 | if (!capable(CAP_SYS_ADMIN)) { |
| 742 | /* only the sysadmin can chown a key to some other UID */ |
| 743 | if (uid != (uid_t) -1 && key->uid != uid) |
| 744 | goto no_access; |
| 745 | |
| 746 | /* only the sysadmin can set the key's GID to a group other |
| 747 | * than one of those that the current process subscribes to */ |
| 748 | if (gid != (gid_t) -1 && gid != key->gid && !in_group_p(gid)) |
| 749 | goto no_access; |
| 750 | } |
| 751 | |
| 752 | /* change the UID (have to update the quotas) */ |
| 753 | if (uid != (uid_t) -1 && uid != key->uid) { |
| 754 | /* don't support UID changing yet */ |
| 755 | ret = -EOPNOTSUPP; |
| 756 | goto no_access; |
| 757 | } |
| 758 | |
| 759 | /* change the GID */ |
| 760 | if (gid != (gid_t) -1) |
| 761 | key->gid = gid; |
| 762 | |
| 763 | ret = 0; |
| 764 | |
| 765 | no_access: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | up_write(&key->sem); |
| 767 | key_put(key); |
| 768 | error: |
| 769 | return ret; |
| 770 | |
| 771 | } /* end keyctl_chown_key() */ |
| 772 | |
| 773 | /*****************************************************************************/ |
| 774 | /* |
| 775 | * change the permission mask on a key |
| 776 | * - the keyring owned by the changer |
| 777 | * - implements keyctl(KEYCTL_SETPERM) |
| 778 | */ |
| 779 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) |
| 780 | { |
| 781 | struct key *key; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 782 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | long ret; |
| 784 | |
| 785 | ret = -EINVAL; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 786 | 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] | 787 | goto error; |
| 788 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 789 | key_ref = lookup_user_key(NULL, id, 1, 1, 0); |
| 790 | if (IS_ERR(key_ref)) { |
| 791 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | goto error; |
| 793 | } |
| 794 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 795 | key = key_ref_to_ptr(key_ref); |
| 796 | |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 797 | /* make the changes with the locks held to prevent chown/chmod races */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | ret = -EACCES; |
| 799 | down_write(&key->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 801 | /* if we're not the sysadmin, we can only change a key that we own */ |
| 802 | if (capable(CAP_SYS_ADMIN) || key->uid == current->fsuid) { |
| 803 | key->perm = perm; |
| 804 | ret = 0; |
| 805 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | up_write(&key->sem); |
| 808 | key_put(key); |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 809 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | return ret; |
| 811 | |
| 812 | } /* end keyctl_setperm_key() */ |
| 813 | |
| 814 | /*****************************************************************************/ |
| 815 | /* |
| 816 | * instantiate the key with the specified payload, and, if one is given, link |
| 817 | * the key into the keyring |
| 818 | */ |
| 819 | long keyctl_instantiate_key(key_serial_t id, |
| 820 | const void __user *_payload, |
| 821 | size_t plen, |
| 822 | key_serial_t ringid) |
| 823 | { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 824 | struct request_key_auth *rka; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 825 | struct key *instkey; |
| 826 | key_ref_t keyring_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 827 | void *payload; |
| 828 | long ret; |
| 829 | |
| 830 | ret = -EINVAL; |
| 831 | if (plen > 32767) |
| 832 | goto error; |
| 833 | |
| 834 | /* pull the payload in if one was supplied */ |
| 835 | payload = NULL; |
| 836 | |
| 837 | if (_payload) { |
| 838 | ret = -ENOMEM; |
| 839 | payload = kmalloc(plen, GFP_KERNEL); |
| 840 | if (!payload) |
| 841 | goto error; |
| 842 | |
| 843 | ret = -EFAULT; |
| 844 | if (copy_from_user(payload, _payload, plen) != 0) |
| 845 | goto error2; |
| 846 | } |
| 847 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 848 | /* find the instantiation authorisation key */ |
| 849 | instkey = key_get_instantiation_authkey(id); |
| 850 | if (IS_ERR(instkey)) { |
| 851 | ret = PTR_ERR(instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 852 | goto error2; |
| 853 | } |
| 854 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 855 | rka = instkey->payload.data; |
| 856 | |
| 857 | /* find the destination keyring amongst those belonging to the |
| 858 | * requesting task */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 859 | keyring_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | if (ringid) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 861 | keyring_ref = lookup_user_key(rka->context, ringid, 1, 0, |
| 862 | KEY_WRITE); |
| 863 | if (IS_ERR(keyring_ref)) { |
| 864 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | goto error3; |
| 866 | } |
| 867 | } |
| 868 | |
| 869 | /* instantiate the key and link it into a keyring */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 870 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 871 | key_ref_to_ptr(keyring_ref), instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 873 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 874 | error3: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 875 | key_put(instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | error2: |
| 877 | kfree(payload); |
| 878 | error: |
| 879 | return ret; |
| 880 | |
| 881 | } /* end keyctl_instantiate_key() */ |
| 882 | |
| 883 | /*****************************************************************************/ |
| 884 | /* |
| 885 | * negatively instantiate the key with the given timeout (in seconds), and, if |
| 886 | * one is given, link the key into the keyring |
| 887 | */ |
| 888 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) |
| 889 | { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 890 | struct request_key_auth *rka; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 891 | struct key *instkey; |
| 892 | key_ref_t keyring_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | long ret; |
| 894 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 895 | /* find the instantiation authorisation key */ |
| 896 | instkey = key_get_instantiation_authkey(id); |
| 897 | if (IS_ERR(instkey)) { |
| 898 | ret = PTR_ERR(instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | goto error; |
| 900 | } |
| 901 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 902 | rka = instkey->payload.data; |
| 903 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | /* find the destination keyring if present (which must also be |
| 905 | * writable) */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 906 | keyring_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 907 | if (ringid) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 908 | keyring_ref = lookup_user_key(NULL, ringid, 1, 0, KEY_WRITE); |
| 909 | if (IS_ERR(keyring_ref)) { |
| 910 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 911 | goto error2; |
| 912 | } |
| 913 | } |
| 914 | |
| 915 | /* instantiate the key and link it into a keyring */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 916 | ret = key_negate_and_link(rka->target_key, timeout, |
| 917 | key_ref_to_ptr(keyring_ref), instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 919 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | error2: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 921 | key_put(instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | error: |
| 923 | return ret; |
| 924 | |
| 925 | } /* end keyctl_negate_key() */ |
| 926 | |
| 927 | /*****************************************************************************/ |
| 928 | /* |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 929 | * set the default keyring in which request_key() will cache keys |
| 930 | * - return the old setting |
| 931 | */ |
| 932 | long keyctl_set_reqkey_keyring(int reqkey_defl) |
| 933 | { |
| 934 | int ret; |
| 935 | |
| 936 | switch (reqkey_defl) { |
| 937 | case KEY_REQKEY_DEFL_THREAD_KEYRING: |
| 938 | ret = install_thread_keyring(current); |
| 939 | if (ret < 0) |
| 940 | return ret; |
| 941 | goto set; |
| 942 | |
| 943 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: |
| 944 | ret = install_process_keyring(current); |
| 945 | if (ret < 0) |
| 946 | return ret; |
| 947 | |
| 948 | case KEY_REQKEY_DEFL_DEFAULT: |
| 949 | case KEY_REQKEY_DEFL_SESSION_KEYRING: |
| 950 | case KEY_REQKEY_DEFL_USER_KEYRING: |
| 951 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: |
| 952 | set: |
| 953 | current->jit_keyring = reqkey_defl; |
| 954 | |
| 955 | case KEY_REQKEY_DEFL_NO_CHANGE: |
| 956 | return current->jit_keyring; |
| 957 | |
| 958 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
| 959 | default: |
| 960 | return -EINVAL; |
| 961 | } |
| 962 | |
| 963 | } /* end keyctl_set_reqkey_keyring() */ |
| 964 | |
| 965 | /*****************************************************************************/ |
| 966 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 967 | * the key control system call |
| 968 | */ |
| 969 | asmlinkage long sys_keyctl(int option, unsigned long arg2, unsigned long arg3, |
| 970 | unsigned long arg4, unsigned long arg5) |
| 971 | { |
| 972 | switch (option) { |
| 973 | case KEYCTL_GET_KEYRING_ID: |
| 974 | return keyctl_get_keyring_ID((key_serial_t) arg2, |
| 975 | (int) arg3); |
| 976 | |
| 977 | case KEYCTL_JOIN_SESSION_KEYRING: |
| 978 | return keyctl_join_session_keyring((const char __user *) arg2); |
| 979 | |
| 980 | case KEYCTL_UPDATE: |
| 981 | return keyctl_update_key((key_serial_t) arg2, |
| 982 | (const void __user *) arg3, |
| 983 | (size_t) arg4); |
| 984 | |
| 985 | case KEYCTL_REVOKE: |
| 986 | return keyctl_revoke_key((key_serial_t) arg2); |
| 987 | |
| 988 | case KEYCTL_DESCRIBE: |
| 989 | return keyctl_describe_key((key_serial_t) arg2, |
| 990 | (char __user *) arg3, |
| 991 | (unsigned) arg4); |
| 992 | |
| 993 | case KEYCTL_CLEAR: |
| 994 | return keyctl_keyring_clear((key_serial_t) arg2); |
| 995 | |
| 996 | case KEYCTL_LINK: |
| 997 | return keyctl_keyring_link((key_serial_t) arg2, |
| 998 | (key_serial_t) arg3); |
| 999 | |
| 1000 | case KEYCTL_UNLINK: |
| 1001 | return keyctl_keyring_unlink((key_serial_t) arg2, |
| 1002 | (key_serial_t) arg3); |
| 1003 | |
| 1004 | case KEYCTL_SEARCH: |
| 1005 | return keyctl_keyring_search((key_serial_t) arg2, |
| 1006 | (const char __user *) arg3, |
| 1007 | (const char __user *) arg4, |
| 1008 | (key_serial_t) arg5); |
| 1009 | |
| 1010 | case KEYCTL_READ: |
| 1011 | return keyctl_read_key((key_serial_t) arg2, |
| 1012 | (char __user *) arg3, |
| 1013 | (size_t) arg4); |
| 1014 | |
| 1015 | case KEYCTL_CHOWN: |
| 1016 | return keyctl_chown_key((key_serial_t) arg2, |
| 1017 | (uid_t) arg3, |
| 1018 | (gid_t) arg4); |
| 1019 | |
| 1020 | case KEYCTL_SETPERM: |
| 1021 | return keyctl_setperm_key((key_serial_t) arg2, |
| 1022 | (key_perm_t) arg3); |
| 1023 | |
| 1024 | case KEYCTL_INSTANTIATE: |
| 1025 | return keyctl_instantiate_key((key_serial_t) arg2, |
| 1026 | (const void __user *) arg3, |
| 1027 | (size_t) arg4, |
| 1028 | (key_serial_t) arg5); |
| 1029 | |
| 1030 | case KEYCTL_NEGATE: |
| 1031 | return keyctl_negate_key((key_serial_t) arg2, |
| 1032 | (unsigned) arg3, |
| 1033 | (key_serial_t) arg4); |
| 1034 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1035 | case KEYCTL_SET_REQKEY_KEYRING: |
| 1036 | return keyctl_set_reqkey_keyring(arg2); |
| 1037 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1038 | default: |
| 1039 | return -EOPNOTSUPP; |
| 1040 | } |
| 1041 | |
| 1042 | } /* end sys_keyctl() */ |