David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1 | /* Userspace key control operations |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Bryan Schumaker | 59e6b9c | 2012-02-24 14:14:50 -0500 | [diff] [blame] | 17 | #include <linux/key.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/keyctl.h> |
| 19 | #include <linux/fs.h> |
Randy.Dunlap | c59ede7 | 2006-01-11 12:17:46 -0800 | [diff] [blame] | 20 | #include <linux/capability.h> |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 21 | #include <linux/string.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/err.h> |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 23 | #include <linux/vmalloc.h> |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 24 | #include <linux/security.h> |
Kent Overstreet | a27bb33 | 2013-05-07 16:19:08 -0700 | [diff] [blame] | 25 | #include <linux/uio.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
| 27 | #include "internal.h" |
| 28 | |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 29 | static int key_get_type_from_user(char *type, |
| 30 | const char __user *_type, |
| 31 | unsigned len) |
| 32 | { |
| 33 | int ret; |
| 34 | |
| 35 | ret = strncpy_from_user(type, _type, len); |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 36 | if (ret < 0) |
Dan Carpenter | 4303ef1 | 2010-06-11 17:30:05 +0100 | [diff] [blame] | 37 | return ret; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 38 | if (ret == 0 || ret >= len) |
| 39 | return -EINVAL; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 40 | type[len - 1] = '\0'; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 41 | return 0; |
| 42 | } |
| 43 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 45 | * Extract the description of a new key from userspace and either add it as a |
| 46 | * new key to the specified keyring or update a matching key in that keyring. |
| 47 | * |
David Howells | cf7f601 | 2012-09-13 13:06:29 +0100 | [diff] [blame] | 48 | * If the description is NULL or an empty string, the key type is asked to |
| 49 | * generate one from the payload. |
| 50 | * |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 51 | * The keyring must be writable so that we can attach the key to it. |
| 52 | * |
| 53 | * If successful, the new key's serial number is returned, otherwise an error |
| 54 | * code is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | */ |
Heiko Carstens | 1e7bfb2 | 2009-01-14 14:14:29 +0100 | [diff] [blame] | 56 | SYSCALL_DEFINE5(add_key, const char __user *, _type, |
| 57 | const char __user *, _description, |
| 58 | const void __user *, _payload, |
| 59 | size_t, plen, |
| 60 | key_serial_t, ringid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 62 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | char type[32], *description; |
| 64 | void *payload; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 65 | long ret; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 66 | bool vm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 67 | |
| 68 | ret = -EINVAL; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 69 | if (plen > 1024 * 1024 - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | goto error; |
| 71 | |
| 72 | /* draw all the data into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 73 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | if (ret < 0) |
| 75 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
David Howells | cf7f601 | 2012-09-13 13:06:29 +0100 | [diff] [blame] | 77 | description = NULL; |
| 78 | if (_description) { |
| 79 | description = strndup_user(_description, PAGE_SIZE); |
| 80 | if (IS_ERR(description)) { |
| 81 | ret = PTR_ERR(description); |
| 82 | goto error; |
| 83 | } |
| 84 | if (!*description) { |
| 85 | kfree(description); |
| 86 | description = NULL; |
Mimi Zohar | a4e3b8d | 2014-05-22 14:02:23 -0400 | [diff] [blame^] | 87 | } else if ((description[0] == '.') && |
| 88 | (strncmp(type, "keyring", 7) == 0)) { |
| 89 | ret = -EPERM; |
| 90 | goto error2; |
David Howells | cf7f601 | 2012-09-13 13:06:29 +0100 | [diff] [blame] | 91 | } |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 92 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | /* pull the payload in if one was supplied */ |
| 95 | payload = NULL; |
| 96 | |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 97 | vm = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 98 | if (_payload) { |
| 99 | ret = -ENOMEM; |
Andrew Morton | 4f1c28d | 2012-05-31 16:26:02 -0700 | [diff] [blame] | 100 | payload = kmalloc(plen, GFP_KERNEL | __GFP_NOWARN); |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 101 | if (!payload) { |
| 102 | if (plen <= PAGE_SIZE) |
| 103 | goto error2; |
| 104 | vm = true; |
| 105 | payload = vmalloc(plen); |
| 106 | if (!payload) |
| 107 | goto error2; |
| 108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
| 110 | ret = -EFAULT; |
| 111 | if (copy_from_user(payload, _payload, plen) != 0) |
| 112 | goto error3; |
| 113 | } |
| 114 | |
| 115 | /* find the target keyring (which must be writable) */ |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 116 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 117 | if (IS_ERR(keyring_ref)) { |
| 118 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 119 | goto error3; |
| 120 | } |
| 121 | |
| 122 | /* create or update the requested key and add it to the target |
| 123 | * keyring */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 124 | key_ref = key_create_or_update(keyring_ref, type, description, |
Arun Raghavan | 6b79ccb | 2008-04-29 01:01:28 -0700 | [diff] [blame] | 125 | payload, plen, KEY_PERM_UNDEF, |
| 126 | KEY_ALLOC_IN_QUOTA); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 127 | if (!IS_ERR(key_ref)) { |
| 128 | ret = key_ref_to_ptr(key_ref)->serial; |
| 129 | key_ref_put(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | } |
| 131 | else { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 132 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | } |
| 134 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 135 | key_ref_put(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | error3: |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 137 | if (!vm) |
| 138 | kfree(payload); |
| 139 | else |
| 140 | vfree(payload); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | error2: |
| 142 | kfree(description); |
| 143 | error: |
| 144 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 145 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 148 | * Search the process keyrings and keyring trees linked from those for a |
| 149 | * matching key. Keyrings must have appropriate Search permission to be |
| 150 | * searched. |
| 151 | * |
| 152 | * If a key is found, it will be attached to the destination keyring if there's |
| 153 | * one specified and the serial number of the key will be returned. |
| 154 | * |
| 155 | * If no key is found, /sbin/request-key will be invoked if _callout_info is |
| 156 | * non-NULL in an attempt to create a key. The _callout_info string will be |
| 157 | * passed to /sbin/request-key to aid with completing the request. If the |
| 158 | * _callout_info string is "" then it will be changed to "-". |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | */ |
Heiko Carstens | 1e7bfb2 | 2009-01-14 14:14:29 +0100 | [diff] [blame] | 160 | SYSCALL_DEFINE4(request_key, const char __user *, _type, |
| 161 | const char __user *, _description, |
| 162 | const char __user *, _callout_info, |
| 163 | key_serial_t, destringid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
| 165 | struct key_type *ktype; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 166 | struct key *key; |
| 167 | key_ref_t dest_ref; |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 168 | size_t callout_len; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | char type[32], *description, *callout_info; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 170 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | |
| 172 | /* pull the type into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 173 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | if (ret < 0) |
| 175 | goto error; |
David Howells | 1260f80 | 2005-08-04 11:50:01 +0100 | [diff] [blame] | 176 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | /* pull the description into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 178 | description = strndup_user(_description, PAGE_SIZE); |
| 179 | if (IS_ERR(description)) { |
| 180 | ret = PTR_ERR(description); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | |
| 184 | /* pull the callout info into kernel space */ |
| 185 | callout_info = NULL; |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 186 | callout_len = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | if (_callout_info) { |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 188 | callout_info = strndup_user(_callout_info, PAGE_SIZE); |
| 189 | if (IS_ERR(callout_info)) { |
| 190 | ret = PTR_ERR(callout_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | goto error2; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 192 | } |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 193 | callout_len = strlen(callout_info); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | /* get the destination keyring if specified */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 197 | dest_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | if (destringid) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 199 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 200 | KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 201 | if (IS_ERR(dest_ref)) { |
| 202 | ret = PTR_ERR(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | goto error3; |
| 204 | } |
| 205 | } |
| 206 | |
| 207 | /* find the key type */ |
| 208 | ktype = key_type_lookup(type); |
| 209 | if (IS_ERR(ktype)) { |
| 210 | ret = PTR_ERR(ktype); |
| 211 | goto error4; |
| 212 | } |
| 213 | |
| 214 | /* do the search */ |
David Howells | 4a38e12 | 2008-04-29 01:01:24 -0700 | [diff] [blame] | 215 | key = request_key_and_link(ktype, description, callout_info, |
| 216 | callout_len, NULL, key_ref_to_ptr(dest_ref), |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 217 | KEY_ALLOC_IN_QUOTA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | if (IS_ERR(key)) { |
| 219 | ret = PTR_ERR(key); |
| 220 | goto error5; |
| 221 | } |
| 222 | |
David Howells | 4aab1e8 | 2011-03-11 17:57:33 +0000 | [diff] [blame] | 223 | /* wait for the key to finish being constructed */ |
| 224 | ret = wait_for_key_construction(key, 1); |
| 225 | if (ret < 0) |
| 226 | goto error6; |
| 227 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | ret = key->serial; |
| 229 | |
David Howells | 4aab1e8 | 2011-03-11 17:57:33 +0000 | [diff] [blame] | 230 | error6: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 231 | key_put(key); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 232 | error5: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | key_type_put(ktype); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 234 | error4: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 235 | key_ref_put(dest_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 236 | error3: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | kfree(callout_info); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 238 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | kfree(description); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 240 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 242 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 243 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 245 | * Get the ID of the specified process keyring. |
| 246 | * |
| 247 | * The requested keyring must have search permission to be found. |
| 248 | * |
| 249 | * If successful, the ID of the requested keyring will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | */ |
| 251 | long keyctl_get_keyring_ID(key_serial_t id, int create) |
| 252 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 253 | key_ref_t key_ref; |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 254 | unsigned long lflags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | long ret; |
| 256 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 257 | lflags = create ? KEY_LOOKUP_CREATE : 0; |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 258 | key_ref = lookup_user_key(id, lflags, KEY_NEED_SEARCH); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 259 | if (IS_ERR(key_ref)) { |
| 260 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | goto error; |
| 262 | } |
| 263 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 264 | ret = key_ref_to_ptr(key_ref)->serial; |
| 265 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 266 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | return ret; |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 268 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 271 | * Join a (named) session keyring. |
| 272 | * |
| 273 | * Create and join an anonymous session keyring or join a named session |
| 274 | * keyring, creating it if necessary. A named session keyring must have Search |
| 275 | * permission for it to be joined. Session keyrings without this permit will |
| 276 | * be skipped over. |
| 277 | * |
| 278 | * If successful, the ID of the joined session keyring will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | */ |
| 280 | long keyctl_join_session_keyring(const char __user *_name) |
| 281 | { |
| 282 | char *name; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 283 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | |
| 285 | /* fetch the name from userspace */ |
| 286 | name = NULL; |
| 287 | if (_name) { |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 288 | name = strndup_user(_name, PAGE_SIZE); |
| 289 | if (IS_ERR(name)) { |
| 290 | ret = PTR_ERR(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 291 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 292 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | } |
| 294 | |
| 295 | /* join the session */ |
| 296 | ret = join_session_keyring(name); |
Vegard Nossum | 0d54ee1 | 2009-01-17 17:45:45 +0100 | [diff] [blame] | 297 | kfree(name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 299 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 301 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 304 | * Update a key's data payload from the given data. |
| 305 | * |
| 306 | * The key must grant the caller Write permission and the key type must support |
| 307 | * updating for this to work. A negative key can be positively instantiated |
| 308 | * with this call. |
| 309 | * |
| 310 | * If successful, 0 will be returned. If the key type does not support |
| 311 | * updating, then -EOPNOTSUPP will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | */ |
| 313 | long keyctl_update_key(key_serial_t id, |
| 314 | const void __user *_payload, |
| 315 | size_t plen) |
| 316 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 317 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | void *payload; |
| 319 | long ret; |
| 320 | |
| 321 | ret = -EINVAL; |
| 322 | if (plen > PAGE_SIZE) |
| 323 | goto error; |
| 324 | |
| 325 | /* pull the payload in if one was supplied */ |
| 326 | payload = NULL; |
| 327 | if (_payload) { |
| 328 | ret = -ENOMEM; |
| 329 | payload = kmalloc(plen, GFP_KERNEL); |
| 330 | if (!payload) |
| 331 | goto error; |
| 332 | |
| 333 | ret = -EFAULT; |
| 334 | if (copy_from_user(payload, _payload, plen) != 0) |
| 335 | goto error2; |
| 336 | } |
| 337 | |
| 338 | /* find the target key (which must be writable) */ |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 339 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 340 | if (IS_ERR(key_ref)) { |
| 341 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | goto error2; |
| 343 | } |
| 344 | |
| 345 | /* update the key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 346 | ret = key_update(key_ref, payload, plen); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 348 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 349 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | kfree(payload); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 351 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 353 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 356 | * Revoke a key. |
| 357 | * |
| 358 | * The key must be grant the caller Write or Setattr permission for this to |
| 359 | * work. The key type should give up its quota claim when revoked. The key |
| 360 | * and any links to the key will be automatically garbage collected after a |
| 361 | * certain amount of time (/proc/sys/kernel/keys/gc_delay). |
| 362 | * |
| 363 | * If successful, 0 is returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 364 | */ |
| 365 | long keyctl_revoke_key(key_serial_t id) |
| 366 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 367 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | long ret; |
| 369 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 370 | key_ref = lookup_user_key(id, 0, KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 371 | if (IS_ERR(key_ref)) { |
| 372 | ret = PTR_ERR(key_ref); |
David Howells | 0c2c9a3 | 2009-09-02 09:13:50 +0100 | [diff] [blame] | 373 | if (ret != -EACCES) |
| 374 | goto error; |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 375 | key_ref = lookup_user_key(id, 0, KEY_NEED_SETATTR); |
David Howells | 0c2c9a3 | 2009-09-02 09:13:50 +0100 | [diff] [blame] | 376 | if (IS_ERR(key_ref)) { |
| 377 | ret = PTR_ERR(key_ref); |
| 378 | goto error; |
| 379 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | } |
| 381 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 382 | key_revoke(key_ref_to_ptr(key_ref)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | ret = 0; |
| 384 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 385 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 386 | error: |
David Howells | 1260f80 | 2005-08-04 11:50:01 +0100 | [diff] [blame] | 387 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 388 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | /* |
David Howells | fd75815 | 2012-05-11 10:56:56 +0100 | [diff] [blame] | 391 | * Invalidate a key. |
| 392 | * |
| 393 | * The key must be grant the caller Invalidate permission for this to work. |
| 394 | * The key and any links to the key will be automatically garbage collected |
| 395 | * immediately. |
| 396 | * |
| 397 | * If successful, 0 is returned. |
| 398 | */ |
| 399 | long keyctl_invalidate_key(key_serial_t id) |
| 400 | { |
| 401 | key_ref_t key_ref; |
| 402 | long ret; |
| 403 | |
| 404 | kenter("%d", id); |
| 405 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 406 | key_ref = lookup_user_key(id, 0, KEY_NEED_SEARCH); |
David Howells | fd75815 | 2012-05-11 10:56:56 +0100 | [diff] [blame] | 407 | if (IS_ERR(key_ref)) { |
| 408 | ret = PTR_ERR(key_ref); |
| 409 | goto error; |
| 410 | } |
| 411 | |
| 412 | key_invalidate(key_ref_to_ptr(key_ref)); |
| 413 | ret = 0; |
| 414 | |
| 415 | key_ref_put(key_ref); |
| 416 | error: |
| 417 | kleave(" = %ld", ret); |
| 418 | return ret; |
| 419 | } |
| 420 | |
| 421 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 422 | * Clear the specified keyring, creating an empty process keyring if one of the |
| 423 | * special keyring IDs is used. |
| 424 | * |
| 425 | * The keyring must grant the caller Write permission for this to work. If |
| 426 | * successful, 0 will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | */ |
| 428 | long keyctl_keyring_clear(key_serial_t ringid) |
| 429 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 430 | key_ref_t keyring_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | long ret; |
| 432 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 433 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 434 | if (IS_ERR(keyring_ref)) { |
| 435 | ret = PTR_ERR(keyring_ref); |
David Howells | 700920e | 2012-01-18 15:31:45 +0000 | [diff] [blame] | 436 | |
| 437 | /* Root is permitted to invalidate certain special keyrings */ |
| 438 | if (capable(CAP_SYS_ADMIN)) { |
| 439 | keyring_ref = lookup_user_key(ringid, 0, 0); |
| 440 | if (IS_ERR(keyring_ref)) |
| 441 | goto error; |
| 442 | if (test_bit(KEY_FLAG_ROOT_CAN_CLEAR, |
| 443 | &key_ref_to_ptr(keyring_ref)->flags)) |
| 444 | goto clear; |
| 445 | goto error_put; |
| 446 | } |
| 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | goto error; |
| 449 | } |
| 450 | |
David Howells | 700920e | 2012-01-18 15:31:45 +0000 | [diff] [blame] | 451 | clear: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 452 | ret = keyring_clear(key_ref_to_ptr(keyring_ref)); |
David Howells | 700920e | 2012-01-18 15:31:45 +0000 | [diff] [blame] | 453 | error_put: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 454 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 455 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 457 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 460 | * Create a link from a keyring to a key if there's no matching key in the |
| 461 | * keyring, otherwise replace the link to the matching key with a link to the |
| 462 | * new key. |
| 463 | * |
| 464 | * The key must grant the caller Link permission and the the keyring must grant |
| 465 | * the caller Write permission. Furthermore, if an additional link is created, |
| 466 | * the keyring's quota will be extended. |
| 467 | * |
| 468 | * If successful, 0 will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | */ |
| 470 | long keyctl_keyring_link(key_serial_t id, key_serial_t ringid) |
| 471 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 472 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 473 | long ret; |
| 474 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 475 | keyring_ref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 476 | if (IS_ERR(keyring_ref)) { |
| 477 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | goto error; |
| 479 | } |
| 480 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 481 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE, KEY_NEED_LINK); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 482 | if (IS_ERR(key_ref)) { |
| 483 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | goto error2; |
| 485 | } |
| 486 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 487 | 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] | 488 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 489 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 490 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 491 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 492 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 494 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 497 | * Unlink a key from a keyring. |
| 498 | * |
| 499 | * The keyring must grant the caller Write permission for this to work; the key |
| 500 | * itself need not grant the caller anything. If the last link to a key is |
| 501 | * removed then that key will be scheduled for destruction. |
| 502 | * |
| 503 | * If successful, 0 will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | */ |
| 505 | long keyctl_keyring_unlink(key_serial_t id, key_serial_t ringid) |
| 506 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 507 | key_ref_t keyring_ref, key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | long ret; |
| 509 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 510 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 511 | if (IS_ERR(keyring_ref)) { |
| 512 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 513 | goto error; |
| 514 | } |
| 515 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 516 | key_ref = lookup_user_key(id, KEY_LOOKUP_FOR_UNLINK, 0); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 517 | if (IS_ERR(key_ref)) { |
| 518 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | goto error2; |
| 520 | } |
| 521 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 522 | 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] | 523 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 524 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 525 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 526 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 527 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 528 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 529 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 532 | * Return a description of a key to userspace. |
| 533 | * |
| 534 | * The key must grant the caller View permission for this to work. |
| 535 | * |
| 536 | * If there's a buffer, we place up to buflen bytes of data into it formatted |
| 537 | * in the following way: |
| 538 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | * type;uid;gid;perm;description<NUL> |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 540 | * |
| 541 | * If successful, we return the amount of description available, irrespective |
| 542 | * of how much we may have copied into the buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | */ |
| 544 | long keyctl_describe_key(key_serial_t keyid, |
| 545 | char __user *buffer, |
| 546 | size_t buflen) |
| 547 | { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 548 | struct key *key, *instkey; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 549 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | char *tmpbuf; |
| 551 | long ret; |
| 552 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 553 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 554 | if (IS_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 555 | /* viewing a key under construction is permitted if we have the |
| 556 | * authorisation token handy */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 557 | if (PTR_ERR(key_ref) == -EACCES) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 558 | instkey = key_get_instantiation_authkey(keyid); |
| 559 | if (!IS_ERR(instkey)) { |
| 560 | key_put(instkey); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 561 | key_ref = lookup_user_key(keyid, |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 562 | KEY_LOOKUP_PARTIAL, |
| 563 | 0); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 564 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 565 | goto okay; |
| 566 | } |
| 567 | } |
| 568 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 569 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | goto error; |
| 571 | } |
| 572 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 573 | okay: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | /* calculate how much description we're going to return */ |
| 575 | ret = -ENOMEM; |
| 576 | tmpbuf = kmalloc(PAGE_SIZE, GFP_KERNEL); |
| 577 | if (!tmpbuf) |
| 578 | goto error2; |
| 579 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 580 | key = key_ref_to_ptr(key_ref); |
| 581 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | ret = snprintf(tmpbuf, PAGE_SIZE - 1, |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 583 | "%s;%d;%d;%08x;%s", |
David Howells | 94fd840 | 2010-06-28 14:05:04 +0100 | [diff] [blame] | 584 | key->type->name, |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 585 | from_kuid_munged(current_user_ns(), key->uid), |
| 586 | from_kgid_munged(current_user_ns(), key->gid), |
David Howells | 94fd840 | 2010-06-28 14:05:04 +0100 | [diff] [blame] | 587 | key->perm, |
| 588 | key->description ?: ""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | |
| 590 | /* include a NUL char at the end of the data */ |
| 591 | if (ret > PAGE_SIZE - 1) |
| 592 | ret = PAGE_SIZE - 1; |
| 593 | tmpbuf[ret] = 0; |
| 594 | ret++; |
| 595 | |
| 596 | /* consider returning the data */ |
| 597 | if (buffer && buflen > 0) { |
| 598 | if (buflen > ret) |
| 599 | buflen = ret; |
| 600 | |
| 601 | if (copy_to_user(buffer, tmpbuf, buflen) != 0) |
| 602 | ret = -EFAULT; |
| 603 | } |
| 604 | |
| 605 | kfree(tmpbuf); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 606 | error2: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 607 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 608 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 613 | * Search the specified keyring and any keyrings it links to for a matching |
| 614 | * key. Only keyrings that grant the caller Search permission will be searched |
| 615 | * (this includes the starting keyring). Only keys with Search permission can |
| 616 | * be found. |
| 617 | * |
| 618 | * If successful, the found key will be linked to the destination keyring if |
| 619 | * supplied and the key has Link permission, and the found key ID will be |
| 620 | * returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | */ |
| 622 | long keyctl_keyring_search(key_serial_t ringid, |
| 623 | const char __user *_type, |
| 624 | const char __user *_description, |
| 625 | key_serial_t destringid) |
| 626 | { |
| 627 | struct key_type *ktype; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 628 | key_ref_t keyring_ref, key_ref, dest_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | char type[32], *description; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 630 | long ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | |
| 632 | /* pull the type and description into kernel space */ |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 633 | ret = key_get_type_from_user(type, _type, sizeof(type)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | if (ret < 0) |
| 635 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 636 | |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 637 | description = strndup_user(_description, PAGE_SIZE); |
| 638 | if (IS_ERR(description)) { |
| 639 | ret = PTR_ERR(description); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | goto error; |
Davi Arnaut | 0cb409d | 2006-03-24 03:18:43 -0800 | [diff] [blame] | 641 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | |
| 643 | /* get the keyring at which to begin the search */ |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 644 | keyring_ref = lookup_user_key(ringid, 0, KEY_NEED_SEARCH); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 645 | if (IS_ERR(keyring_ref)) { |
| 646 | ret = PTR_ERR(keyring_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 647 | goto error2; |
| 648 | } |
| 649 | |
| 650 | /* get the destination keyring if specified */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 651 | dest_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | if (destringid) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 653 | dest_ref = lookup_user_key(destringid, KEY_LOOKUP_CREATE, |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 654 | KEY_NEED_WRITE); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 655 | if (IS_ERR(dest_ref)) { |
| 656 | ret = PTR_ERR(dest_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | goto error3; |
| 658 | } |
| 659 | } |
| 660 | |
| 661 | /* find the key type */ |
| 662 | ktype = key_type_lookup(type); |
| 663 | if (IS_ERR(ktype)) { |
| 664 | ret = PTR_ERR(ktype); |
| 665 | goto error4; |
| 666 | } |
| 667 | |
| 668 | /* do the search */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 669 | key_ref = keyring_search(keyring_ref, ktype, description); |
| 670 | if (IS_ERR(key_ref)) { |
| 671 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
| 673 | /* treat lack or presence of a negative key the same */ |
| 674 | if (ret == -EAGAIN) |
| 675 | ret = -ENOKEY; |
| 676 | goto error5; |
| 677 | } |
| 678 | |
| 679 | /* link the resulting key to the destination keyring if we can */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 680 | if (dest_ref) { |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 681 | ret = key_permission(key_ref, KEY_NEED_LINK); |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 682 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | goto error6; |
| 684 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 685 | 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] | 686 | if (ret < 0) |
| 687 | goto error6; |
| 688 | } |
| 689 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 690 | ret = key_ref_to_ptr(key_ref)->serial; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 692 | error6: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 693 | key_ref_put(key_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 694 | error5: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | key_type_put(ktype); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 696 | error4: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 697 | key_ref_put(dest_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 698 | error3: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 699 | key_ref_put(keyring_ref); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 700 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | kfree(description); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 702 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 703 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 704 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 707 | * Read a key's payload. |
| 708 | * |
| 709 | * The key must either grant the caller Read permission, or it must grant the |
| 710 | * caller Search permission when searched for from the process keyrings. |
| 711 | * |
| 712 | * If successful, we place up to buflen bytes of data into the buffer, if one |
| 713 | * is provided, and return the amount of data that is available in the key, |
| 714 | * irrespective of how much we copied into the buffer. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | */ |
| 716 | long keyctl_read_key(key_serial_t keyid, char __user *buffer, size_t buflen) |
| 717 | { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 718 | struct key *key; |
| 719 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | long ret; |
| 721 | |
| 722 | /* find the key first */ |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 723 | key_ref = lookup_user_key(keyid, 0, 0); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 724 | if (IS_ERR(key_ref)) { |
| 725 | ret = -ENOKEY; |
| 726 | goto error; |
| 727 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 729 | key = key_ref_to_ptr(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 731 | /* see if we can read it directly */ |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 732 | ret = key_permission(key_ref, KEY_NEED_READ); |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 733 | if (ret == 0) |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 734 | goto can_read_key; |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 735 | if (ret != -EACCES) |
| 736 | goto error; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 737 | |
| 738 | /* we can't; see if it's searchable from this process's keyrings |
| 739 | * - we automatically take account of the fact that it may be |
| 740 | * dangling off an instantiation key |
| 741 | */ |
| 742 | if (!is_key_possessed(key_ref)) { |
| 743 | ret = -EACCES; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | goto error2; |
| 745 | } |
| 746 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 747 | /* the key is probably readable - now try to read it */ |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 748 | can_read_key: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | ret = key_validate(key); |
| 750 | if (ret == 0) { |
| 751 | ret = -EOPNOTSUPP; |
| 752 | if (key->type->read) { |
| 753 | /* read the data with the semaphore held (since we |
| 754 | * might sleep) */ |
| 755 | down_read(&key->sem); |
| 756 | ret = key->type->read(key, buffer, buflen); |
| 757 | up_read(&key->sem); |
| 758 | } |
| 759 | } |
| 760 | |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 761 | error2: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 762 | key_put(key); |
Justin P. Mattock | c5b60b5 | 2010-04-21 00:02:11 -0700 | [diff] [blame] | 763 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 765 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 768 | * Change the ownership of a key |
| 769 | * |
| 770 | * The key must grant the caller Setattr permission for this to work, though |
| 771 | * the key need not be fully instantiated yet. For the UID to be changed, or |
| 772 | * for the GID to be changed to a group the caller is not a member of, the |
| 773 | * caller must have sysadmin capability. If either uid or gid is -1 then that |
| 774 | * attribute is not changed. |
| 775 | * |
| 776 | * If the UID is to be changed, the new user must have sufficient quota to |
| 777 | * accept the key. The quota deduction will be removed from the old user to |
| 778 | * the new user should the attribute be changed. |
| 779 | * |
| 780 | * If successful, 0 will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 782 | long keyctl_chown_key(key_serial_t id, uid_t user, gid_t group) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | { |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 784 | struct key_user *newowner, *zapowner = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | struct key *key; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 786 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | long ret; |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 788 | kuid_t uid; |
| 789 | kgid_t gid; |
| 790 | |
| 791 | uid = make_kuid(current_user_ns(), user); |
| 792 | gid = make_kgid(current_user_ns(), group); |
| 793 | ret = -EINVAL; |
| 794 | if ((user != (uid_t) -1) && !uid_valid(uid)) |
| 795 | goto error; |
| 796 | if ((group != (gid_t) -1) && !gid_valid(gid)) |
| 797 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | |
| 799 | ret = 0; |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 800 | if (user == (uid_t) -1 && group == (gid_t) -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 801 | goto error; |
| 802 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 803 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 804 | KEY_NEED_SETATTR); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 805 | if (IS_ERR(key_ref)) { |
| 806 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | goto error; |
| 808 | } |
| 809 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 810 | key = key_ref_to_ptr(key_ref); |
| 811 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | /* make the changes with the locks held to prevent chown/chown races */ |
| 813 | ret = -EACCES; |
| 814 | down_write(&key->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 815 | |
| 816 | if (!capable(CAP_SYS_ADMIN)) { |
| 817 | /* only the sysadmin can chown a key to some other UID */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 818 | if (user != (uid_t) -1 && !uid_eq(key->uid, uid)) |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 819 | goto error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 820 | |
| 821 | /* only the sysadmin can set the key's GID to a group other |
| 822 | * than one of those that the current process subscribes to */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 823 | if (group != (gid_t) -1 && !gid_eq(gid, key->gid) && !in_group_p(gid)) |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 824 | goto error_put; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | } |
| 826 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 827 | /* change the UID */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 828 | if (user != (uid_t) -1 && !uid_eq(uid, key->uid)) { |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 829 | ret = -ENOMEM; |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 830 | newowner = key_user_lookup(uid); |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 831 | if (!newowner) |
| 832 | goto error_put; |
| 833 | |
| 834 | /* transfer the quota burden to the new user */ |
| 835 | if (test_bit(KEY_FLAG_IN_QUOTA, &key->flags)) { |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 836 | unsigned maxkeys = uid_eq(uid, GLOBAL_ROOT_UID) ? |
David Howells | 0b77f5b | 2008-04-29 01:01:32 -0700 | [diff] [blame] | 837 | key_quota_root_maxkeys : key_quota_maxkeys; |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 838 | unsigned maxbytes = uid_eq(uid, GLOBAL_ROOT_UID) ? |
David Howells | 0b77f5b | 2008-04-29 01:01:32 -0700 | [diff] [blame] | 839 | key_quota_root_maxbytes : key_quota_maxbytes; |
| 840 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 841 | spin_lock(&newowner->lock); |
David Howells | 0b77f5b | 2008-04-29 01:01:32 -0700 | [diff] [blame] | 842 | if (newowner->qnkeys + 1 >= maxkeys || |
| 843 | newowner->qnbytes + key->quotalen >= maxbytes || |
| 844 | newowner->qnbytes + key->quotalen < |
| 845 | newowner->qnbytes) |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 846 | goto quota_overrun; |
| 847 | |
| 848 | newowner->qnkeys++; |
| 849 | newowner->qnbytes += key->quotalen; |
| 850 | spin_unlock(&newowner->lock); |
| 851 | |
| 852 | spin_lock(&key->user->lock); |
| 853 | key->user->qnkeys--; |
| 854 | key->user->qnbytes -= key->quotalen; |
| 855 | spin_unlock(&key->user->lock); |
| 856 | } |
| 857 | |
| 858 | atomic_dec(&key->user->nkeys); |
| 859 | atomic_inc(&newowner->nkeys); |
| 860 | |
| 861 | if (test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) { |
| 862 | atomic_dec(&key->user->nikeys); |
| 863 | atomic_inc(&newowner->nikeys); |
| 864 | } |
| 865 | |
| 866 | zapowner = key->user; |
| 867 | key->user = newowner; |
| 868 | key->uid = uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | } |
| 870 | |
| 871 | /* change the GID */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 872 | if (group != (gid_t) -1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | key->gid = gid; |
| 874 | |
| 875 | ret = 0; |
| 876 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 877 | error_put: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | up_write(&key->sem); |
| 879 | key_put(key); |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 880 | if (zapowner) |
| 881 | key_user_put(zapowner); |
| 882 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 883 | return ret; |
| 884 | |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 885 | quota_overrun: |
| 886 | spin_unlock(&newowner->lock); |
| 887 | zapowner = newowner; |
| 888 | ret = -EDQUOT; |
| 889 | goto error_put; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 890 | } |
Fredrik Tolf | 5801649 | 2006-06-26 00:24:51 -0700 | [diff] [blame] | 891 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 893 | * Change the permission mask on a key. |
| 894 | * |
| 895 | * The key must grant the caller Setattr permission for this to work, though |
| 896 | * the key need not be fully instantiated yet. If the caller does not have |
| 897 | * sysadmin capability, it may only change the permission on keys that it owns. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 898 | */ |
| 899 | long keyctl_setperm_key(key_serial_t id, key_perm_t perm) |
| 900 | { |
| 901 | struct key *key; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 902 | key_ref_t key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | long ret; |
| 904 | |
| 905 | ret = -EINVAL; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 906 | 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] | 907 | goto error; |
| 908 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 909 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 910 | KEY_NEED_SETATTR); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 911 | if (IS_ERR(key_ref)) { |
| 912 | ret = PTR_ERR(key_ref); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | goto error; |
| 914 | } |
| 915 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 916 | key = key_ref_to_ptr(key_ref); |
| 917 | |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 918 | /* make the changes with the locks held to prevent chown/chmod races */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | ret = -EACCES; |
| 920 | down_write(&key->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 922 | /* if we're not the sysadmin, we can only change a key that we own */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 923 | if (capable(CAP_SYS_ADMIN) || uid_eq(key->uid, current_fsuid())) { |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 924 | key->perm = perm; |
| 925 | ret = 0; |
| 926 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | up_write(&key->sem); |
| 929 | key_put(key); |
David Howells | 76d8aea | 2005-06-23 22:00:49 -0700 | [diff] [blame] | 930 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 931 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 932 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 933 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 934 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 935 | * Get the destination keyring for instantiation and check that the caller has |
| 936 | * Write permission on it. |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 937 | */ |
| 938 | static long get_instantiation_keyring(key_serial_t ringid, |
| 939 | struct request_key_auth *rka, |
| 940 | struct key **_dest_keyring) |
| 941 | { |
| 942 | key_ref_t dkref; |
| 943 | |
David Howells | eca1bf5 | 2008-12-29 00:41:51 +0000 | [diff] [blame] | 944 | *_dest_keyring = NULL; |
| 945 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 946 | /* 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] | 947 | if (ringid == 0) |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 948 | return 0; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 949 | |
| 950 | /* if a specific keyring is nominated by ID, then use that */ |
| 951 | if (ringid > 0) { |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 952 | dkref = lookup_user_key(ringid, KEY_LOOKUP_CREATE, KEY_NEED_WRITE); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 953 | if (IS_ERR(dkref)) |
| 954 | return PTR_ERR(dkref); |
| 955 | *_dest_keyring = key_ref_to_ptr(dkref); |
| 956 | return 0; |
| 957 | } |
| 958 | |
| 959 | if (ringid == KEY_SPEC_REQKEY_AUTH_KEY) |
| 960 | return -EINVAL; |
| 961 | |
| 962 | /* otherwise specify the destination keyring recorded in the |
| 963 | * authorisation key (any KEY_SPEC_*_KEYRING) */ |
| 964 | if (ringid >= KEY_SPEC_REQUESTOR_KEYRING) { |
David Howells | 21279cf | 2009-10-15 10:14:35 +0100 | [diff] [blame] | 965 | *_dest_keyring = key_get(rka->dest_keyring); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 966 | return 0; |
| 967 | } |
| 968 | |
| 969 | return -ENOKEY; |
| 970 | } |
| 971 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 972 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 973 | * Change the request_key authorisation key on the current process. |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 974 | */ |
| 975 | static int keyctl_change_reqkey_auth(struct key *key) |
| 976 | { |
| 977 | struct cred *new; |
| 978 | |
| 979 | new = prepare_creds(); |
| 980 | if (!new) |
| 981 | return -ENOMEM; |
| 982 | |
| 983 | key_put(new->request_key_auth); |
| 984 | new->request_key_auth = key_get(key); |
| 985 | |
| 986 | return commit_creds(new); |
| 987 | } |
| 988 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | /* |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 990 | * Copy the iovec data from userspace |
| 991 | */ |
| 992 | static long copy_from_user_iovec(void *buffer, const struct iovec *iov, |
| 993 | unsigned ioc) |
| 994 | { |
| 995 | for (; ioc > 0; ioc--) { |
| 996 | if (copy_from_user(buffer, iov->iov_base, iov->iov_len) != 0) |
| 997 | return -EFAULT; |
| 998 | buffer += iov->iov_len; |
| 999 | iov++; |
| 1000 | } |
| 1001 | return 0; |
| 1002 | } |
| 1003 | |
| 1004 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1005 | * Instantiate a key with the specified payload and link the key into the |
| 1006 | * destination keyring if one is given. |
| 1007 | * |
| 1008 | * The caller must have the appropriate instantiation permit set for this to |
| 1009 | * work (see keyctl_assume_authority). No other permissions are required. |
| 1010 | * |
| 1011 | * If successful, 0 will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | */ |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1013 | long keyctl_instantiate_key_common(key_serial_t id, |
| 1014 | const struct iovec *payload_iov, |
| 1015 | unsigned ioc, |
| 1016 | size_t plen, |
| 1017 | key_serial_t ringid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1019 | const struct cred *cred = current_cred(); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1020 | struct request_key_auth *rka; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1021 | struct key *instkey, *dest_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1022 | void *payload; |
| 1023 | long ret; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 1024 | bool vm = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1026 | kenter("%d,,%zu,%d", id, plen, ringid); |
| 1027 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1028 | ret = -EINVAL; |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 1029 | if (plen > 1024 * 1024 - 1) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | goto error; |
| 1031 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1032 | /* the appropriate instantiation authorisation key must have been |
| 1033 | * assumed before calling this */ |
| 1034 | ret = -EPERM; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1035 | instkey = cred->request_key_auth; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1036 | if (!instkey) |
| 1037 | goto error; |
| 1038 | |
| 1039 | rka = instkey->payload.data; |
| 1040 | if (rka->target_key->serial != id) |
| 1041 | goto error; |
| 1042 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | /* pull the payload in if one was supplied */ |
| 1044 | payload = NULL; |
| 1045 | |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1046 | if (payload_iov) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | ret = -ENOMEM; |
| 1048 | payload = kmalloc(plen, GFP_KERNEL); |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 1049 | if (!payload) { |
| 1050 | if (plen <= PAGE_SIZE) |
| 1051 | goto error; |
| 1052 | vm = true; |
| 1053 | payload = vmalloc(plen); |
| 1054 | if (!payload) |
| 1055 | goto error; |
| 1056 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1057 | |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1058 | ret = copy_from_user_iovec(payload, payload_iov, ioc); |
| 1059 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1060 | goto error2; |
| 1061 | } |
| 1062 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1063 | /* find the destination keyring amongst those belonging to the |
| 1064 | * requesting task */ |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1065 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
| 1066 | if (ret < 0) |
| 1067 | goto error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | |
| 1069 | /* instantiate the key and link it into a keyring */ |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1070 | ret = key_instantiate_and_link(rka->target_key, payload, plen, |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1071 | dest_keyring, instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1073 | key_put(dest_keyring); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1074 | |
| 1075 | /* discard the assumed authority if it's just been disabled by |
| 1076 | * instantiation of the key */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1077 | if (ret == 0) |
| 1078 | keyctl_change_reqkey_auth(NULL); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1079 | |
| 1080 | error2: |
David Howells | 38bbca6 | 2008-04-29 01:01:19 -0700 | [diff] [blame] | 1081 | if (!vm) |
| 1082 | kfree(payload); |
| 1083 | else |
| 1084 | vfree(payload); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1085 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 1087 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | /* |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1090 | * Instantiate a key with the specified payload and link the key into the |
| 1091 | * destination keyring if one is given. |
| 1092 | * |
| 1093 | * The caller must have the appropriate instantiation permit set for this to |
| 1094 | * work (see keyctl_assume_authority). No other permissions are required. |
| 1095 | * |
| 1096 | * If successful, 0 will be returned. |
| 1097 | */ |
| 1098 | long keyctl_instantiate_key(key_serial_t id, |
| 1099 | const void __user *_payload, |
| 1100 | size_t plen, |
| 1101 | key_serial_t ringid) |
| 1102 | { |
| 1103 | if (_payload && plen) { |
| 1104 | struct iovec iov[1] = { |
| 1105 | [0].iov_base = (void __user *)_payload, |
| 1106 | [0].iov_len = plen |
| 1107 | }; |
| 1108 | |
| 1109 | return keyctl_instantiate_key_common(id, iov, 1, plen, ringid); |
| 1110 | } |
| 1111 | |
| 1112 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); |
| 1113 | } |
| 1114 | |
| 1115 | /* |
| 1116 | * Instantiate a key with the specified multipart payload and link the key into |
| 1117 | * the destination keyring if one is given. |
| 1118 | * |
| 1119 | * The caller must have the appropriate instantiation permit set for this to |
| 1120 | * work (see keyctl_assume_authority). No other permissions are required. |
| 1121 | * |
| 1122 | * If successful, 0 will be returned. |
| 1123 | */ |
| 1124 | long keyctl_instantiate_key_iov(key_serial_t id, |
| 1125 | const struct iovec __user *_payload_iov, |
| 1126 | unsigned ioc, |
| 1127 | key_serial_t ringid) |
| 1128 | { |
| 1129 | struct iovec iovstack[UIO_FASTIOV], *iov = iovstack; |
| 1130 | long ret; |
| 1131 | |
David Howells | 423b9788 | 2012-05-21 12:32:13 +0100 | [diff] [blame] | 1132 | if (!_payload_iov || !ioc) |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1133 | goto no_payload; |
| 1134 | |
| 1135 | ret = rw_copy_check_uvector(WRITE, _payload_iov, ioc, |
Christopher Yeoh | ac34ebb | 2012-05-31 16:26:42 -0700 | [diff] [blame] | 1136 | ARRAY_SIZE(iovstack), iovstack, &iov); |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1137 | if (ret < 0) |
Alan Cox | a84a921 | 2012-09-28 12:20:02 +0100 | [diff] [blame] | 1138 | goto err; |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1139 | if (ret == 0) |
| 1140 | goto no_payload_free; |
| 1141 | |
| 1142 | ret = keyctl_instantiate_key_common(id, iov, ioc, ret, ringid); |
Alan Cox | a84a921 | 2012-09-28 12:20:02 +0100 | [diff] [blame] | 1143 | err: |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1144 | if (iov != iovstack) |
| 1145 | kfree(iov); |
| 1146 | return ret; |
| 1147 | |
| 1148 | no_payload_free: |
| 1149 | if (iov != iovstack) |
| 1150 | kfree(iov); |
| 1151 | no_payload: |
| 1152 | return keyctl_instantiate_key_common(id, NULL, 0, 0, ringid); |
| 1153 | } |
| 1154 | |
| 1155 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1156 | * Negatively instantiate the key with the given timeout (in seconds) and link |
| 1157 | * the key into the destination keyring if one is given. |
| 1158 | * |
| 1159 | * The caller must have the appropriate instantiation permit set for this to |
| 1160 | * work (see keyctl_assume_authority). No other permissions are required. |
| 1161 | * |
| 1162 | * The key and any links to the key will be automatically garbage collected |
| 1163 | * after the timeout expires. |
| 1164 | * |
| 1165 | * Negative keys are used to rate limit repeated request_key() calls by causing |
| 1166 | * them to return -ENOKEY until the negative key expires. |
| 1167 | * |
| 1168 | * If successful, 0 will be returned. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | */ |
| 1170 | long keyctl_negate_key(key_serial_t id, unsigned timeout, key_serial_t ringid) |
| 1171 | { |
David Howells | fdd1b94 | 2011-03-07 15:06:09 +0000 | [diff] [blame] | 1172 | return keyctl_reject_key(id, timeout, ENOKEY, ringid); |
| 1173 | } |
| 1174 | |
| 1175 | /* |
| 1176 | * Negatively instantiate the key with the given timeout (in seconds) and error |
| 1177 | * code and link the key into the destination keyring if one is given. |
| 1178 | * |
| 1179 | * The caller must have the appropriate instantiation permit set for this to |
| 1180 | * work (see keyctl_assume_authority). No other permissions are required. |
| 1181 | * |
| 1182 | * The key and any links to the key will be automatically garbage collected |
| 1183 | * after the timeout expires. |
| 1184 | * |
| 1185 | * Negative keys are used to rate limit repeated request_key() calls by causing |
| 1186 | * them to return the specified error code until the negative key expires. |
| 1187 | * |
| 1188 | * If successful, 0 will be returned. |
| 1189 | */ |
| 1190 | long keyctl_reject_key(key_serial_t id, unsigned timeout, unsigned error, |
| 1191 | key_serial_t ringid) |
| 1192 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1193 | const struct cred *cred = current_cred(); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1194 | struct request_key_auth *rka; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1195 | struct key *instkey, *dest_keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | long ret; |
| 1197 | |
David Howells | fdd1b94 | 2011-03-07 15:06:09 +0000 | [diff] [blame] | 1198 | kenter("%d,%u,%u,%d", id, timeout, error, ringid); |
| 1199 | |
| 1200 | /* must be a valid error code and mustn't be a kernel special */ |
| 1201 | if (error <= 0 || |
| 1202 | error >= MAX_ERRNO || |
| 1203 | error == ERESTARTSYS || |
| 1204 | error == ERESTARTNOINTR || |
| 1205 | error == ERESTARTNOHAND || |
| 1206 | error == ERESTART_RESTARTBLOCK) |
| 1207 | return -EINVAL; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1208 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1209 | /* the appropriate instantiation authorisation key must have been |
| 1210 | * assumed before calling this */ |
| 1211 | ret = -EPERM; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1212 | instkey = cred->request_key_auth; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1213 | if (!instkey) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1216 | rka = instkey->payload.data; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1217 | if (rka->target_key->serial != id) |
| 1218 | goto error; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1219 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | /* find the destination keyring if present (which must also be |
| 1221 | * writable) */ |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1222 | ret = get_instantiation_keyring(ringid, rka, &dest_keyring); |
| 1223 | if (ret < 0) |
| 1224 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | |
| 1226 | /* instantiate the key and link it into a keyring */ |
David Howells | fdd1b94 | 2011-03-07 15:06:09 +0000 | [diff] [blame] | 1227 | ret = key_reject_and_link(rka->target_key, timeout, error, |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1228 | dest_keyring, instkey); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 1230 | key_put(dest_keyring); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1231 | |
| 1232 | /* discard the assumed authority if it's just been disabled by |
| 1233 | * instantiation of the key */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1234 | if (ret == 0) |
| 1235 | keyctl_change_reqkey_auth(NULL); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1236 | |
| 1237 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 1239 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1240 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1242 | * Read or set the default keyring in which request_key() will cache keys and |
| 1243 | * return the old setting. |
| 1244 | * |
| 1245 | * If a process keyring is specified then this will be created if it doesn't |
| 1246 | * yet exist. The old setting will be returned if successful. |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1247 | */ |
| 1248 | long keyctl_set_reqkey_keyring(int reqkey_defl) |
| 1249 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1250 | struct cred *new; |
| 1251 | int ret, old_setting; |
| 1252 | |
| 1253 | old_setting = current_cred_xxx(jit_keyring); |
| 1254 | |
| 1255 | if (reqkey_defl == KEY_REQKEY_DEFL_NO_CHANGE) |
| 1256 | return old_setting; |
| 1257 | |
| 1258 | new = prepare_creds(); |
| 1259 | if (!new) |
| 1260 | return -ENOMEM; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1261 | |
| 1262 | switch (reqkey_defl) { |
| 1263 | case KEY_REQKEY_DEFL_THREAD_KEYRING: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1264 | ret = install_thread_keyring_to_cred(new); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1265 | if (ret < 0) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1266 | goto error; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1267 | goto set; |
| 1268 | |
| 1269 | case KEY_REQKEY_DEFL_PROCESS_KEYRING: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1270 | ret = install_process_keyring_to_cred(new); |
| 1271 | if (ret < 0) { |
| 1272 | if (ret != -EEXIST) |
| 1273 | goto error; |
| 1274 | ret = 0; |
| 1275 | } |
| 1276 | goto set; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1277 | |
| 1278 | case KEY_REQKEY_DEFL_DEFAULT: |
| 1279 | case KEY_REQKEY_DEFL_SESSION_KEYRING: |
| 1280 | case KEY_REQKEY_DEFL_USER_KEYRING: |
| 1281 | case KEY_REQKEY_DEFL_USER_SESSION_KEYRING: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1282 | case KEY_REQKEY_DEFL_REQUESTOR_KEYRING: |
| 1283 | goto set; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1284 | |
| 1285 | case KEY_REQKEY_DEFL_NO_CHANGE: |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1286 | case KEY_REQKEY_DEFL_GROUP_KEYRING: |
| 1287 | default: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1288 | ret = -EINVAL; |
| 1289 | goto error; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1290 | } |
| 1291 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1292 | set: |
| 1293 | new->jit_keyring = reqkey_defl; |
| 1294 | commit_creds(new); |
| 1295 | return old_setting; |
| 1296 | error: |
| 1297 | abort_creds(new); |
Dan Carpenter | 4303ef1 | 2010-06-11 17:30:05 +0100 | [diff] [blame] | 1298 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 1299 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1300 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1301 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1302 | * Set or clear the timeout on a key. |
| 1303 | * |
| 1304 | * Either the key must grant the caller Setattr permission or else the caller |
| 1305 | * must hold an instantiation authorisation token for the key. |
| 1306 | * |
| 1307 | * The timeout is either 0 to clear the timeout, or a number of seconds from |
| 1308 | * the current time. The key and any links to the key will be automatically |
| 1309 | * garbage collected after the timeout expires. |
| 1310 | * |
| 1311 | * If successful, 0 is returned. |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1312 | */ |
| 1313 | long keyctl_set_timeout(key_serial_t id, unsigned timeout) |
| 1314 | { |
David Howells | 9156235 | 2010-06-11 17:31:05 +0100 | [diff] [blame] | 1315 | struct key *key, *instkey; |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1316 | key_ref_t key_ref; |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1317 | long ret; |
| 1318 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 1319 | key_ref = lookup_user_key(id, KEY_LOOKUP_CREATE | KEY_LOOKUP_PARTIAL, |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 1320 | KEY_NEED_SETATTR); |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1321 | if (IS_ERR(key_ref)) { |
David Howells | 9156235 | 2010-06-11 17:31:05 +0100 | [diff] [blame] | 1322 | /* setting the timeout on a key under construction is permitted |
| 1323 | * if we have the authorisation token handy */ |
| 1324 | if (PTR_ERR(key_ref) == -EACCES) { |
| 1325 | instkey = key_get_instantiation_authkey(id); |
| 1326 | if (!IS_ERR(instkey)) { |
| 1327 | key_put(instkey); |
| 1328 | key_ref = lookup_user_key(id, |
| 1329 | KEY_LOOKUP_PARTIAL, |
| 1330 | 0); |
| 1331 | if (!IS_ERR(key_ref)) |
| 1332 | goto okay; |
| 1333 | } |
| 1334 | } |
| 1335 | |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1336 | ret = PTR_ERR(key_ref); |
| 1337 | goto error; |
| 1338 | } |
| 1339 | |
David Howells | 9156235 | 2010-06-11 17:31:05 +0100 | [diff] [blame] | 1340 | okay: |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1341 | key = key_ref_to_ptr(key_ref); |
Bryan Schumaker | 59e6b9c | 2012-02-24 14:14:50 -0500 | [diff] [blame] | 1342 | key_set_timeout(key, timeout); |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1343 | key_put(key); |
| 1344 | |
| 1345 | ret = 0; |
| 1346 | error: |
| 1347 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 1348 | } |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1349 | |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1350 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1351 | * Assume (or clear) the authority to instantiate the specified key. |
| 1352 | * |
| 1353 | * This sets the authoritative token currently in force for key instantiation. |
| 1354 | * This must be done for a key to be instantiated. It has the effect of making |
| 1355 | * available all the keys from the caller of the request_key() that created a |
| 1356 | * key to request_key() calls made by the caller of this function. |
| 1357 | * |
| 1358 | * The caller must have the instantiation key in their process keyrings with a |
| 1359 | * Search permission grant available to the caller. |
| 1360 | * |
| 1361 | * If the ID given is 0, then the setting will be cleared and 0 returned. |
| 1362 | * |
| 1363 | * If the ID given has a matching an authorisation key, then that key will be |
| 1364 | * set and its ID will be returned. The authorisation key can be read to get |
| 1365 | * the callout information passed to request_key(). |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1366 | */ |
| 1367 | long keyctl_assume_authority(key_serial_t id) |
| 1368 | { |
| 1369 | struct key *authkey; |
| 1370 | long ret; |
| 1371 | |
| 1372 | /* special key IDs aren't permitted */ |
| 1373 | ret = -EINVAL; |
| 1374 | if (id < 0) |
| 1375 | goto error; |
| 1376 | |
| 1377 | /* we divest ourselves of authority if given an ID of 0 */ |
| 1378 | if (id == 0) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1379 | ret = keyctl_change_reqkey_auth(NULL); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1380 | goto error; |
| 1381 | } |
| 1382 | |
| 1383 | /* attempt to assume the authority temporarily granted to us whilst we |
| 1384 | * instantiate the specified key |
| 1385 | * - the authorisation key must be in the current task's keyrings |
| 1386 | * somewhere |
| 1387 | */ |
| 1388 | authkey = key_get_instantiation_authkey(id); |
| 1389 | if (IS_ERR(authkey)) { |
| 1390 | ret = PTR_ERR(authkey); |
| 1391 | goto error; |
| 1392 | } |
| 1393 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1394 | ret = keyctl_change_reqkey_auth(authkey); |
| 1395 | if (ret < 0) |
| 1396 | goto error; |
| 1397 | key_put(authkey); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1398 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 1399 | ret = authkey->serial; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1400 | error: |
| 1401 | return ret; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 1402 | } |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1403 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1404 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1405 | * Get a key's the LSM security label. |
| 1406 | * |
| 1407 | * The key must grant the caller View permission for this to work. |
| 1408 | * |
| 1409 | * If there's a buffer, then up to buflen bytes of data will be placed into it. |
| 1410 | * |
| 1411 | * If successful, the amount of information available will be returned, |
| 1412 | * irrespective of how much was copied (including the terminal NUL). |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1413 | */ |
| 1414 | long keyctl_get_security(key_serial_t keyid, |
| 1415 | char __user *buffer, |
| 1416 | size_t buflen) |
| 1417 | { |
| 1418 | struct key *key, *instkey; |
| 1419 | key_ref_t key_ref; |
| 1420 | char *context; |
| 1421 | long ret; |
| 1422 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 1423 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, KEY_NEED_VIEW); |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1424 | if (IS_ERR(key_ref)) { |
| 1425 | if (PTR_ERR(key_ref) != -EACCES) |
| 1426 | return PTR_ERR(key_ref); |
| 1427 | |
| 1428 | /* viewing a key under construction is also permitted if we |
| 1429 | * have the authorisation token handy */ |
| 1430 | instkey = key_get_instantiation_authkey(keyid); |
| 1431 | if (IS_ERR(instkey)) |
Roel Kluin | fa1cc7b | 2009-12-15 15:05:12 -0800 | [diff] [blame] | 1432 | return PTR_ERR(instkey); |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1433 | key_put(instkey); |
| 1434 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 1435 | key_ref = lookup_user_key(keyid, KEY_LOOKUP_PARTIAL, 0); |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1436 | if (IS_ERR(key_ref)) |
| 1437 | return PTR_ERR(key_ref); |
| 1438 | } |
| 1439 | |
| 1440 | key = key_ref_to_ptr(key_ref); |
| 1441 | ret = security_key_getsecurity(key, &context); |
| 1442 | if (ret == 0) { |
| 1443 | /* if no information was returned, give userspace an empty |
| 1444 | * string */ |
| 1445 | ret = 1; |
| 1446 | if (buffer && buflen > 0 && |
| 1447 | copy_to_user(buffer, "", 1) != 0) |
| 1448 | ret = -EFAULT; |
| 1449 | } else if (ret > 0) { |
| 1450 | /* return as much data as there's room for */ |
| 1451 | if (buffer && buflen > 0) { |
| 1452 | if (buflen > ret) |
| 1453 | buflen = ret; |
| 1454 | |
| 1455 | if (copy_to_user(buffer, context, buflen) != 0) |
| 1456 | ret = -EFAULT; |
| 1457 | } |
| 1458 | |
| 1459 | kfree(context); |
| 1460 | } |
| 1461 | |
| 1462 | key_ref_put(key_ref); |
| 1463 | return ret; |
| 1464 | } |
| 1465 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1466 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1467 | * Attempt to install the calling process's session keyring on the process's |
| 1468 | * parent process. |
| 1469 | * |
| 1470 | * The keyring must exist and must grant the caller LINK permission, and the |
| 1471 | * parent process must be single-threaded and must have the same effective |
| 1472 | * ownership as this process and mustn't be SUID/SGID. |
| 1473 | * |
| 1474 | * The keyring will be emplaced on the parent when it next resumes userspace. |
| 1475 | * |
| 1476 | * If successful, 0 will be returned. |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1477 | */ |
| 1478 | long keyctl_session_to_parent(void) |
| 1479 | { |
| 1480 | struct task_struct *me, *parent; |
| 1481 | const struct cred *mycred, *pcred; |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 1482 | struct callback_head *newwork, *oldwork; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1483 | key_ref_t keyring_r; |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1484 | struct cred *cred; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1485 | int ret; |
| 1486 | |
David Howells | f589594 | 2014-03-14 17:44:49 +0000 | [diff] [blame] | 1487 | keyring_r = lookup_user_key(KEY_SPEC_SESSION_KEYRING, 0, KEY_NEED_LINK); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1488 | if (IS_ERR(keyring_r)) |
| 1489 | return PTR_ERR(keyring_r); |
| 1490 | |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1491 | ret = -ENOMEM; |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1492 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1493 | /* our parent is going to need a new cred struct, a new tgcred struct |
| 1494 | * and new security data, so we allocate them here to prevent ENOMEM in |
| 1495 | * our parent */ |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1496 | cred = cred_alloc_blank(); |
| 1497 | if (!cred) |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 1498 | goto error_keyring; |
| 1499 | newwork = &cred->rcu; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1500 | |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 1501 | cred->session_keyring = key_ref_to_ptr(keyring_r); |
| 1502 | keyring_r = NULL; |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 1503 | init_task_work(newwork, key_change_session_keyring); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1504 | |
| 1505 | me = current; |
David Howells | 9d1ac65 | 2010-09-10 09:59:46 +0100 | [diff] [blame] | 1506 | rcu_read_lock(); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1507 | write_lock_irq(&tasklist_lock); |
| 1508 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1509 | ret = -EPERM; |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1510 | oldwork = NULL; |
| 1511 | parent = me->real_parent; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1512 | |
| 1513 | /* the parent mustn't be init and mustn't be a kernel thread */ |
| 1514 | if (parent->pid <= 1 || !parent->mm) |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1515 | goto unlock; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1516 | |
| 1517 | /* the parent must be single threaded */ |
Oleg Nesterov | dd98acf | 2010-05-26 14:43:23 -0700 | [diff] [blame] | 1518 | if (!thread_group_empty(parent)) |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1519 | goto unlock; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1520 | |
| 1521 | /* the parent and the child must have different session keyrings or |
| 1522 | * there's no point */ |
| 1523 | mycred = current_cred(); |
| 1524 | pcred = __task_cred(parent); |
| 1525 | if (mycred == pcred || |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 1526 | mycred->session_keyring == pcred->session_keyring) { |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1527 | ret = 0; |
| 1528 | goto unlock; |
| 1529 | } |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1530 | |
| 1531 | /* the parent must have the same effective ownership and mustn't be |
| 1532 | * SUID/SGID */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 1533 | if (!uid_eq(pcred->uid, mycred->euid) || |
| 1534 | !uid_eq(pcred->euid, mycred->euid) || |
| 1535 | !uid_eq(pcred->suid, mycred->euid) || |
| 1536 | !gid_eq(pcred->gid, mycred->egid) || |
| 1537 | !gid_eq(pcred->egid, mycred->egid) || |
| 1538 | !gid_eq(pcred->sgid, mycred->egid)) |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1539 | goto unlock; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1540 | |
| 1541 | /* the keyrings must have the same UID */ |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 1542 | if ((pcred->session_keyring && |
Linus Torvalds | 2a74dbb | 2012-12-16 15:40:50 -0800 | [diff] [blame] | 1543 | !uid_eq(pcred->session_keyring->uid, mycred->euid)) || |
| 1544 | !uid_eq(mycred->session_keyring->uid, mycred->euid)) |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1545 | goto unlock; |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1546 | |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1547 | /* cancel an already pending keyring replacement */ |
| 1548 | oldwork = task_work_cancel(parent, key_change_session_keyring); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1549 | |
| 1550 | /* the replacement session keyring is applied just prior to userspace |
| 1551 | * restarting */ |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 1552 | ret = task_work_add(parent, newwork, true); |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 1553 | if (!ret) |
| 1554 | newwork = NULL; |
| 1555 | unlock: |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1556 | write_unlock_irq(&tasklist_lock); |
David Howells | 9d1ac65 | 2010-09-10 09:59:46 +0100 | [diff] [blame] | 1557 | rcu_read_unlock(); |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 1558 | if (oldwork) |
| 1559 | put_cred(container_of(oldwork, struct cred, rcu)); |
| 1560 | if (newwork) |
| 1561 | put_cred(cred); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1562 | return ret; |
| 1563 | |
| 1564 | error_keyring: |
| 1565 | key_ref_put(keyring_r); |
| 1566 | return ret; |
| 1567 | } |
| 1568 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1569 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1570 | * The key control system call |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1571 | */ |
Heiko Carstens | 938bb9f | 2009-01-14 14:14:30 +0100 | [diff] [blame] | 1572 | SYSCALL_DEFINE5(keyctl, int, option, unsigned long, arg2, unsigned long, arg3, |
| 1573 | unsigned long, arg4, unsigned long, arg5) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1574 | { |
| 1575 | switch (option) { |
| 1576 | case KEYCTL_GET_KEYRING_ID: |
| 1577 | return keyctl_get_keyring_ID((key_serial_t) arg2, |
| 1578 | (int) arg3); |
| 1579 | |
| 1580 | case KEYCTL_JOIN_SESSION_KEYRING: |
| 1581 | return keyctl_join_session_keyring((const char __user *) arg2); |
| 1582 | |
| 1583 | case KEYCTL_UPDATE: |
| 1584 | return keyctl_update_key((key_serial_t) arg2, |
| 1585 | (const void __user *) arg3, |
| 1586 | (size_t) arg4); |
| 1587 | |
| 1588 | case KEYCTL_REVOKE: |
| 1589 | return keyctl_revoke_key((key_serial_t) arg2); |
| 1590 | |
| 1591 | case KEYCTL_DESCRIBE: |
| 1592 | return keyctl_describe_key((key_serial_t) arg2, |
| 1593 | (char __user *) arg3, |
| 1594 | (unsigned) arg4); |
| 1595 | |
| 1596 | case KEYCTL_CLEAR: |
| 1597 | return keyctl_keyring_clear((key_serial_t) arg2); |
| 1598 | |
| 1599 | case KEYCTL_LINK: |
| 1600 | return keyctl_keyring_link((key_serial_t) arg2, |
| 1601 | (key_serial_t) arg3); |
| 1602 | |
| 1603 | case KEYCTL_UNLINK: |
| 1604 | return keyctl_keyring_unlink((key_serial_t) arg2, |
| 1605 | (key_serial_t) arg3); |
| 1606 | |
| 1607 | case KEYCTL_SEARCH: |
| 1608 | return keyctl_keyring_search((key_serial_t) arg2, |
| 1609 | (const char __user *) arg3, |
| 1610 | (const char __user *) arg4, |
| 1611 | (key_serial_t) arg5); |
| 1612 | |
| 1613 | case KEYCTL_READ: |
| 1614 | return keyctl_read_key((key_serial_t) arg2, |
| 1615 | (char __user *) arg3, |
| 1616 | (size_t) arg4); |
| 1617 | |
| 1618 | case KEYCTL_CHOWN: |
| 1619 | return keyctl_chown_key((key_serial_t) arg2, |
| 1620 | (uid_t) arg3, |
| 1621 | (gid_t) arg4); |
| 1622 | |
| 1623 | case KEYCTL_SETPERM: |
| 1624 | return keyctl_setperm_key((key_serial_t) arg2, |
| 1625 | (key_perm_t) arg3); |
| 1626 | |
| 1627 | case KEYCTL_INSTANTIATE: |
| 1628 | return keyctl_instantiate_key((key_serial_t) arg2, |
| 1629 | (const void __user *) arg3, |
| 1630 | (size_t) arg4, |
| 1631 | (key_serial_t) arg5); |
| 1632 | |
| 1633 | case KEYCTL_NEGATE: |
| 1634 | return keyctl_negate_key((key_serial_t) arg2, |
| 1635 | (unsigned) arg3, |
| 1636 | (key_serial_t) arg4); |
| 1637 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 1638 | case KEYCTL_SET_REQKEY_KEYRING: |
| 1639 | return keyctl_set_reqkey_keyring(arg2); |
| 1640 | |
David Howells | 017679c | 2006-01-08 01:02:43 -0800 | [diff] [blame] | 1641 | case KEYCTL_SET_TIMEOUT: |
| 1642 | return keyctl_set_timeout((key_serial_t) arg2, |
| 1643 | (unsigned) arg3); |
| 1644 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 1645 | case KEYCTL_ASSUME_AUTHORITY: |
| 1646 | return keyctl_assume_authority((key_serial_t) arg2); |
| 1647 | |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1648 | case KEYCTL_GET_SECURITY: |
| 1649 | return keyctl_get_security((key_serial_t) arg2, |
James Morris | 90bd49a | 2008-12-29 14:35:35 +1100 | [diff] [blame] | 1650 | (char __user *) arg3, |
David Howells | 70a5bb7 | 2008-04-29 01:01:26 -0700 | [diff] [blame] | 1651 | (size_t) arg4); |
| 1652 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 1653 | case KEYCTL_SESSION_TO_PARENT: |
| 1654 | return keyctl_session_to_parent(); |
| 1655 | |
David Howells | fdd1b94 | 2011-03-07 15:06:09 +0000 | [diff] [blame] | 1656 | case KEYCTL_REJECT: |
| 1657 | return keyctl_reject_key((key_serial_t) arg2, |
| 1658 | (unsigned) arg3, |
| 1659 | (unsigned) arg4, |
| 1660 | (key_serial_t) arg5); |
| 1661 | |
David Howells | ee009e4a0 | 2011-03-07 15:06:20 +0000 | [diff] [blame] | 1662 | case KEYCTL_INSTANTIATE_IOV: |
| 1663 | return keyctl_instantiate_key_iov( |
| 1664 | (key_serial_t) arg2, |
| 1665 | (const struct iovec __user *) arg3, |
| 1666 | (unsigned) arg4, |
| 1667 | (key_serial_t) arg5); |
| 1668 | |
David Howells | fd75815 | 2012-05-11 10:56:56 +0100 | [diff] [blame] | 1669 | case KEYCTL_INVALIDATE: |
| 1670 | return keyctl_invalidate_key((key_serial_t) arg2); |
| 1671 | |
David Howells | f36f8c7 | 2013-09-24 10:35:19 +0100 | [diff] [blame] | 1672 | case KEYCTL_GET_PERSISTENT: |
| 1673 | return keyctl_get_persistent((uid_t)arg2, (key_serial_t)arg3); |
| 1674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1675 | default: |
| 1676 | return -EOPNOTSUPP; |
| 1677 | } |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 1678 | } |