David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 1 | /* Manage a process's keyrings |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 3 | * Copyright (C) 2004-2005, 2008 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 15 | #include <linux/keyctl.h> |
| 16 | #include <linux/fs.h> |
| 17 | #include <linux/err.h> |
Ingo Molnar | bb003079 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 18 | #include <linux/mutex.h> |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 19 | #include <linux/security.h> |
Serge E. Hallyn | 1d1e975 | 2009-02-26 18:27:38 -0600 | [diff] [blame] | 20 | #include <linux/user_namespace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include <asm/uaccess.h> |
| 22 | #include "internal.h" |
| 23 | |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 24 | /* Session keyring create vs join semaphore */ |
Ingo Molnar | bb003079 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 25 | static DEFINE_MUTEX(key_session_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 27 | /* User keyring creation semaphore */ |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 28 | static DEFINE_MUTEX(key_user_keyring_mutex); |
| 29 | |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 30 | /* The root user's tracking struct */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | struct key_user root_key_user = { |
| 32 | .usage = ATOMIC_INIT(3), |
David Howells | 76181c1 | 2007-10-16 23:29:46 -0700 | [diff] [blame] | 33 | .cons_lock = __MUTEX_INITIALIZER(root_key_user.cons_lock), |
Peter Zijlstra | 6cfd76a | 2006-12-06 20:37:22 -0800 | [diff] [blame] | 34 | .lock = __SPIN_LOCK_UNLOCKED(root_key_user.lock), |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | .nkeys = ATOMIC_INIT(2), |
| 36 | .nikeys = ATOMIC_INIT(2), |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 37 | .uid = GLOBAL_ROOT_UID, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | }; |
| 39 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 41 | * Install the user and user session keyrings for the current process's UID. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | */ |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 43 | int install_user_keyrings(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 45 | struct user_struct *user; |
| 46 | const struct cred *cred; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | struct key *uid_keyring, *session_keyring; |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 48 | key_perm_t user_keyring_perm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | char buf[20]; |
| 50 | int ret; |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 51 | uid_t uid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 53 | user_keyring_perm = (KEY_POS_ALL & ~KEY_POS_SETATTR) | KEY_USR_ALL; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 54 | cred = current_cred(); |
| 55 | user = cred->user; |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 56 | uid = from_kuid(cred->user_ns, user->uid); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 57 | |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 58 | kenter("%p{%u}", user, uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
David Howells | 0da9dfd | 2013-03-12 16:44:31 +1100 | [diff] [blame] | 60 | if (user->uid_keyring && user->session_keyring) { |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 61 | kleave(" = 0 [exist]"); |
| 62 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | } |
| 64 | |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 65 | mutex_lock(&key_user_keyring_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | ret = 0; |
| 67 | |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 68 | if (!user->uid_keyring) { |
| 69 | /* get the UID-specific keyring |
| 70 | * - there may be one in existence already as it may have been |
| 71 | * pinned by a session, but the user_struct pointing to it |
| 72 | * may have been destroyed by setuid */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 73 | sprintf(buf, "_uid.%u", uid); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 75 | uid_keyring = find_keyring_by_name(buf, true); |
| 76 | if (IS_ERR(uid_keyring)) { |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 77 | uid_keyring = keyring_alloc(buf, user->uid, INVALID_GID, |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 78 | cred, user_keyring_perm, |
| 79 | KEY_ALLOC_IN_QUOTA, NULL); |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 80 | if (IS_ERR(uid_keyring)) { |
| 81 | ret = PTR_ERR(uid_keyring); |
| 82 | goto error; |
| 83 | } |
| 84 | } |
| 85 | |
| 86 | /* get a default session keyring (which might also exist |
| 87 | * already) */ |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 88 | sprintf(buf, "_uid_ses.%u", uid); |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 89 | |
| 90 | session_keyring = find_keyring_by_name(buf, true); |
| 91 | if (IS_ERR(session_keyring)) { |
| 92 | session_keyring = |
Eric W. Biederman | 9a56c2d | 2012-02-08 07:53:04 -0800 | [diff] [blame] | 93 | keyring_alloc(buf, user->uid, INVALID_GID, |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 94 | cred, user_keyring_perm, |
| 95 | KEY_ALLOC_IN_QUOTA, NULL); |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 96 | if (IS_ERR(session_keyring)) { |
| 97 | ret = PTR_ERR(session_keyring); |
| 98 | goto error_release; |
| 99 | } |
| 100 | |
| 101 | /* we install a link from the user session keyring to |
| 102 | * the user keyring */ |
| 103 | ret = key_link(session_keyring, uid_keyring); |
| 104 | if (ret < 0) |
| 105 | goto error_release_both; |
| 106 | } |
| 107 | |
| 108 | /* install the keyrings */ |
| 109 | user->uid_keyring = uid_keyring; |
| 110 | user->session_keyring = session_keyring; |
| 111 | } |
| 112 | |
| 113 | mutex_unlock(&key_user_keyring_mutex); |
| 114 | kleave(" = 0"); |
| 115 | return 0; |
| 116 | |
| 117 | error_release_both: |
| 118 | key_put(session_keyring); |
| 119 | error_release: |
| 120 | key_put(uid_keyring); |
| 121 | error: |
| 122 | mutex_unlock(&key_user_keyring_mutex); |
| 123 | kleave(" = %d", ret); |
| 124 | return ret; |
| 125 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 128 | * Install a fresh thread keyring directly to new credentials. This keyring is |
| 129 | * allowed to overrun the quota. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 131 | int install_thread_keyring_to_cred(struct cred *new) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 133 | struct key *keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 135 | keyring = keyring_alloc("_tid", new->uid, new->gid, new, |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 136 | KEY_POS_ALL | KEY_USR_VIEW, |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 137 | KEY_ALLOC_QUOTA_OVERRUN, NULL); |
| 138 | if (IS_ERR(keyring)) |
| 139 | return PTR_ERR(keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 141 | new->thread_keyring = keyring; |
| 142 | return 0; |
| 143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 146 | * Install a fresh thread keyring, discarding the old one. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 148 | static int install_thread_keyring(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 150 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | int ret; |
| 152 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 153 | new = prepare_creds(); |
| 154 | if (!new) |
| 155 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 156 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 157 | BUG_ON(new->thread_keyring); |
| 158 | |
| 159 | ret = install_thread_keyring_to_cred(new); |
| 160 | if (ret < 0) { |
| 161 | abort_creds(new); |
| 162 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | } |
| 164 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 165 | return commit_creds(new); |
| 166 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 167 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 168 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 169 | * Install a process keyring directly to a credentials struct. |
| 170 | * |
| 171 | * Returns -EEXIST if there was already a process keyring, 0 if one installed, |
| 172 | * and other value on any other error |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 173 | */ |
| 174 | int install_process_keyring_to_cred(struct cred *new) |
| 175 | { |
| 176 | struct key *keyring; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 178 | if (new->process_keyring) |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 179 | return -EEXIST; |
| 180 | |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 181 | keyring = keyring_alloc("_pid", new->uid, new->gid, new, |
| 182 | KEY_POS_ALL | KEY_USR_VIEW, |
| 183 | KEY_ALLOC_QUOTA_OVERRUN, NULL); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 184 | if (IS_ERR(keyring)) |
| 185 | return PTR_ERR(keyring); |
| 186 | |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 187 | new->process_keyring = keyring; |
| 188 | return 0; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 189 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 192 | * Make sure a process keyring is installed for the current process. The |
| 193 | * existing process keyring is not replaced. |
| 194 | * |
| 195 | * Returns 0 if there is a process keyring by the end of this function, some |
| 196 | * error otherwise. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 198 | static int install_process_keyring(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 200 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | int ret; |
| 202 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 203 | new = prepare_creds(); |
| 204 | if (!new) |
| 205 | return -ENOMEM; |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 206 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 207 | ret = install_process_keyring_to_cred(new); |
| 208 | if (ret < 0) { |
| 209 | abort_creds(new); |
Andi Kleen | 27d6379 | 2010-10-28 13:16:13 +0100 | [diff] [blame] | 210 | return ret != -EEXIST ? ret : 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 213 | return commit_creds(new); |
| 214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 217 | * Install a session keyring directly to a credentials struct. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | */ |
Oleg Nesterov | 685bfd2 | 2010-05-26 14:43:00 -0700 | [diff] [blame] | 219 | int install_session_keyring_to_cred(struct cred *cred, struct key *keyring) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | { |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 221 | unsigned long flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 222 | struct key *old; |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 223 | |
| 224 | might_sleep(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | /* create an empty session keyring */ |
| 227 | if (!keyring) { |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 228 | flags = KEY_ALLOC_QUOTA_OVERRUN; |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 229 | if (cred->session_keyring) |
David Howells | 7e047ef | 2006-06-26 00:24:50 -0700 | [diff] [blame] | 230 | flags = KEY_ALLOC_IN_QUOTA; |
| 231 | |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 232 | keyring = keyring_alloc("_ses", cred->uid, cred->gid, cred, |
| 233 | KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ, |
| 234 | flags, NULL); |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 235 | if (IS_ERR(keyring)) |
| 236 | return PTR_ERR(keyring); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 237 | } else { |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 238 | __key_get(keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | } |
| 240 | |
| 241 | /* install the keyring */ |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 242 | old = cred->session_keyring; |
| 243 | rcu_assign_pointer(cred->session_keyring, keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 245 | if (old) |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 246 | key_put(old); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | |
David Howells | 1a26feb | 2006-04-10 22:54:26 -0700 | [diff] [blame] | 248 | return 0; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 249 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 252 | * Install a session keyring, discarding the old one. If a keyring is not |
| 253 | * supplied, an empty one is invented. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 255 | static int install_session_keyring(struct key *keyring) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 257 | struct cred *new; |
| 258 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 260 | new = prepare_creds(); |
| 261 | if (!new) |
| 262 | return -ENOMEM; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 263 | |
David Howells | 99599537 | 2011-08-22 14:08:33 +0100 | [diff] [blame] | 264 | ret = install_session_keyring_to_cred(new, keyring); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 265 | if (ret < 0) { |
| 266 | abort_creds(new); |
| 267 | return ret; |
| 268 | } |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 269 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 270 | return commit_creds(new); |
| 271 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 272 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 274 | * Handle the fsuid changing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 275 | */ |
| 276 | void key_fsuid_changed(struct task_struct *tsk) |
| 277 | { |
| 278 | /* update the ownership of the thread keyring */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 279 | BUG_ON(!tsk->cred); |
| 280 | if (tsk->cred->thread_keyring) { |
| 281 | down_write(&tsk->cred->thread_keyring->sem); |
| 282 | tsk->cred->thread_keyring->uid = tsk->cred->fsuid; |
| 283 | up_write(&tsk->cred->thread_keyring->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 285 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 286 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 287 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 288 | * Handle the fsgid changing. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 289 | */ |
| 290 | void key_fsgid_changed(struct task_struct *tsk) |
| 291 | { |
| 292 | /* update the ownership of the thread keyring */ |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 293 | BUG_ON(!tsk->cred); |
| 294 | if (tsk->cred->thread_keyring) { |
| 295 | down_write(&tsk->cred->thread_keyring->sem); |
| 296 | tsk->cred->thread_keyring->gid = tsk->cred->fsgid; |
| 297 | up_write(&tsk->cred->thread_keyring->sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | } |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 299 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 300 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 302 | * Search the process keyrings attached to the supplied cred for the first |
| 303 | * matching key. |
| 304 | * |
| 305 | * The search criteria are the type and the match function. The description is |
| 306 | * given to the match function as a parameter, but doesn't otherwise influence |
| 307 | * the search. Typically the match function will compare the description |
| 308 | * parameter to the key's description. |
| 309 | * |
| 310 | * This can only search keyrings that grant Search permission to the supplied |
| 311 | * credentials. Keyrings linked to searched keyrings will also be searched if |
| 312 | * they grant Search permission too. Keys can only be found if they grant |
| 313 | * Search permission to the credentials. |
| 314 | * |
| 315 | * Returns a pointer to the key with the key usage count incremented if |
| 316 | * successful, -EAGAIN if we didn't find any matching key or -ENOKEY if we only |
| 317 | * matched negative keys. |
| 318 | * |
| 319 | * In the case of a successful return, the possession attribute is set on the |
| 320 | * returned key reference. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 322 | key_ref_t search_my_process_keyrings(struct keyring_search_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 323 | { |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 324 | key_ref_t key_ref, ret, err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
| 326 | /* we want to return -EAGAIN or -ENOKEY if any of the keyrings were |
| 327 | * searchable, but we failed to find a key or we found a negative key; |
| 328 | * otherwise we want to return a sample error (probably -EACCES) if |
| 329 | * none of the keyrings were searchable |
| 330 | * |
| 331 | * in terms of priority: success > -ENOKEY > -EAGAIN > other error |
| 332 | */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 333 | key_ref = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 334 | ret = NULL; |
| 335 | err = ERR_PTR(-EAGAIN); |
| 336 | |
| 337 | /* search the thread keyring first */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 338 | if (ctx->cred->thread_keyring) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 339 | key_ref = keyring_search_aux( |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 340 | make_key_ref(ctx->cred->thread_keyring, 1), ctx); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 341 | if (!IS_ERR(key_ref)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 342 | goto found; |
| 343 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 344 | switch (PTR_ERR(key_ref)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | case -EAGAIN: /* no key */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 347 | ret = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | break; |
| 349 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 350 | err = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | break; |
| 352 | } |
| 353 | } |
| 354 | |
| 355 | /* search the process keyring second */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 356 | if (ctx->cred->process_keyring) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 357 | key_ref = keyring_search_aux( |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 358 | make_key_ref(ctx->cred->process_keyring, 1), ctx); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 359 | if (!IS_ERR(key_ref)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | goto found; |
| 361 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 362 | switch (PTR_ERR(key_ref)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | case -EAGAIN: /* no key */ |
David Howells | fe9453a | 2013-02-21 12:00:25 +0000 | [diff] [blame] | 364 | if (ret) |
| 365 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 367 | ret = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | break; |
| 369 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 370 | err = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | break; |
| 372 | } |
| 373 | } |
| 374 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 375 | /* search the session keyring */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 376 | if (ctx->cred->session_keyring) { |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 377 | rcu_read_lock(); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 378 | key_ref = keyring_search_aux( |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 379 | make_key_ref(rcu_dereference(ctx->cred->session_keyring), 1), |
| 380 | ctx); |
David Howells | 8589b4e | 2005-06-23 22:00:53 -0700 | [diff] [blame] | 381 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 383 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 384 | goto found; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 386 | switch (PTR_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 387 | case -EAGAIN: /* no key */ |
| 388 | if (ret) |
| 389 | break; |
| 390 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 391 | ret = key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | break; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 393 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 394 | err = key_ref; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 395 | break; |
| 396 | } |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 397 | } |
| 398 | /* or search the user-session keyring */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 399 | else if (ctx->cred->user->session_keyring) { |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 400 | key_ref = keyring_search_aux( |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 401 | make_key_ref(ctx->cred->user->session_keyring, 1), |
| 402 | ctx); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 403 | if (!IS_ERR(key_ref)) |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 404 | goto found; |
| 405 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 406 | switch (PTR_ERR(key_ref)) { |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 407 | case -EAGAIN: /* no key */ |
| 408 | if (ret) |
| 409 | break; |
| 410 | case -ENOKEY: /* negative key */ |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 411 | ret = key_ref; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 412 | break; |
| 413 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 414 | err = key_ref; |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 415 | break; |
| 416 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 417 | } |
| 418 | |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 419 | /* no key - decide on the error we're going to go for */ |
| 420 | key_ref = ret ? ret : err; |
| 421 | |
| 422 | found: |
| 423 | return key_ref; |
| 424 | } |
| 425 | |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 426 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 427 | * Search the process keyrings attached to the supplied cred for the first |
| 428 | * matching key in the manner of search_my_process_keyrings(), but also search |
| 429 | * the keys attached to the assumed authorisation key using its credentials if |
| 430 | * one is available. |
| 431 | * |
| 432 | * Return same as search_my_process_keyrings(). |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 433 | */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 434 | key_ref_t search_process_keyrings(struct keyring_search_context *ctx) |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 435 | { |
| 436 | struct request_key_auth *rka; |
| 437 | key_ref_t key_ref, ret = ERR_PTR(-EACCES), err; |
| 438 | |
| 439 | might_sleep(); |
| 440 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 441 | key_ref = search_my_process_keyrings(ctx); |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 442 | if (!IS_ERR(key_ref)) |
| 443 | goto found; |
| 444 | err = key_ref; |
| 445 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 446 | /* if this process has an instantiation authorisation key, then we also |
| 447 | * search the keyrings of the process mentioned there |
| 448 | * - we don't permit access to request_key auth keys via this method |
| 449 | */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 450 | if (ctx->cred->request_key_auth && |
| 451 | ctx->cred == current_cred() && |
| 452 | ctx->index_key.type != &key_type_request_key_auth |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 453 | ) { |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 454 | const struct cred *cred = ctx->cred; |
| 455 | |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 456 | /* defend against the auth key being revoked */ |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 457 | down_read(&cred->request_key_auth->sem); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 458 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 459 | if (key_validate(ctx->cred->request_key_auth) == 0) { |
| 460 | rka = ctx->cred->request_key_auth->payload.data; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 461 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 462 | ctx->cred = rka->cred; |
| 463 | key_ref = search_process_keyrings(ctx); |
| 464 | ctx->cred = cred; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 465 | |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 466 | up_read(&cred->request_key_auth->sem); |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 467 | |
| 468 | if (!IS_ERR(key_ref)) |
| 469 | goto found; |
| 470 | |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 471 | ret = key_ref; |
David Howells | 04c567d | 2006-06-22 14:47:18 -0700 | [diff] [blame] | 472 | } else { |
David Howells | c69e8d9 | 2008-11-14 10:39:19 +1100 | [diff] [blame] | 473 | up_read(&cred->request_key_auth->sem); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 474 | } |
| 475 | } |
| 476 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | /* no key - decide on the error we're going to go for */ |
David Howells | 927942a | 2010-06-11 17:31:10 +0100 | [diff] [blame] | 478 | if (err == ERR_PTR(-ENOKEY) || ret == ERR_PTR(-ENOKEY)) |
| 479 | key_ref = ERR_PTR(-ENOKEY); |
| 480 | else if (err == ERR_PTR(-EACCES)) |
| 481 | key_ref = ret; |
| 482 | else |
| 483 | key_ref = err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 485 | found: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 486 | return key_ref; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 487 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 490 | * See if the key we're looking at is the target key. |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 491 | */ |
David Howells | 0c903ab | 2014-09-16 17:36:08 +0100 | [diff] [blame] | 492 | bool lookup_user_key_possessed(const struct key *key, |
| 493 | const struct key_match_data *match_data) |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 494 | { |
David Howells | 4629195 | 2014-09-16 17:36:02 +0100 | [diff] [blame] | 495 | return key == match_data->raw_data; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 496 | } |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 497 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 498 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 499 | * Look up a key ID given us by userspace with a given permissions mask to get |
| 500 | * the key it refers to. |
| 501 | * |
| 502 | * Flags can be passed to request that special keyrings be created if referred |
| 503 | * to directly, to permit partially constructed keys to be found and to skip |
| 504 | * validity and permission checks on the found key. |
| 505 | * |
| 506 | * Returns a pointer to the key with an incremented usage count if successful; |
| 507 | * -EINVAL if the key ID is invalid; -ENOKEY if the key ID does not correspond |
| 508 | * to a key or the best found key was a negative key; -EKEYREVOKED or |
| 509 | * -EKEYEXPIRED if the best found key was revoked or expired; -EACCES if the |
| 510 | * found key doesn't grant the requested permit or the LSM denied access to it; |
| 511 | * or -ENOMEM if a special keyring couldn't be created. |
| 512 | * |
| 513 | * In the case of a successful return, the possession attribute is set on the |
| 514 | * returned key reference. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | */ |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 516 | key_ref_t lookup_user_key(key_serial_t id, unsigned long lflags, |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 517 | key_perm_t perm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | { |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 519 | struct keyring_search_context ctx = { |
David Howells | 4629195 | 2014-09-16 17:36:02 +0100 | [diff] [blame] | 520 | .match_data.cmp = lookup_user_key_possessed, |
| 521 | .match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT, |
| 522 | .flags = KEYRING_SEARCH_NO_STATE_CHECK, |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 523 | }; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 524 | struct request_key_auth *rka; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | struct key *key; |
David Howells | b6dff3e | 2008-11-14 10:39:16 +1100 | [diff] [blame] | 526 | key_ref_t key_ref, skey_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | int ret; |
| 528 | |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 529 | try_again: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 530 | ctx.cred = get_current_cred(); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 531 | key_ref = ERR_PTR(-ENOKEY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
| 533 | switch (id) { |
| 534 | case KEY_SPEC_THREAD_KEYRING: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 535 | if (!ctx.cred->thread_keyring) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 536 | if (!(lflags & KEY_LOOKUP_CREATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | goto error; |
| 538 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 539 | ret = install_thread_keyring(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | if (ret < 0) { |
Dan Carpenter | 4d09ec0 | 2010-05-17 14:42:35 +0100 | [diff] [blame] | 541 | key_ref = ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | goto error; |
| 543 | } |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 544 | goto reget_creds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | } |
| 546 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 547 | key = ctx.cred->thread_keyring; |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 548 | __key_get(key); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 549 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | break; |
| 551 | |
| 552 | case KEY_SPEC_PROCESS_KEYRING: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 553 | if (!ctx.cred->process_keyring) { |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 554 | if (!(lflags & KEY_LOOKUP_CREATE)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | goto error; |
| 556 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 557 | ret = install_process_keyring(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | if (ret < 0) { |
Dan Carpenter | 4d09ec0 | 2010-05-17 14:42:35 +0100 | [diff] [blame] | 559 | key_ref = ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | goto error; |
| 561 | } |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 562 | goto reget_creds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | } |
| 564 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 565 | key = ctx.cred->process_keyring; |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 566 | __key_get(key); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 567 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | break; |
| 569 | |
| 570 | case KEY_SPEC_SESSION_KEYRING: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 571 | if (!ctx.cred->session_keyring) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | /* always install a session keyring upon access if one |
| 573 | * doesn't exist yet */ |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 574 | ret = install_user_keyrings(); |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 575 | if (ret < 0) |
| 576 | goto error; |
David Howells | 3ecf1b4 | 2011-08-22 14:08:43 +0100 | [diff] [blame] | 577 | if (lflags & KEY_LOOKUP_CREATE) |
| 578 | ret = join_session_keyring(NULL); |
| 579 | else |
| 580 | ret = install_session_keyring( |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 581 | ctx.cred->user->session_keyring); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 582 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 583 | if (ret < 0) |
| 584 | goto error; |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 585 | goto reget_creds; |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 586 | } else if (ctx.cred->session_keyring == |
| 587 | ctx.cred->user->session_keyring && |
David Howells | 3ecf1b4 | 2011-08-22 14:08:43 +0100 | [diff] [blame] | 588 | lflags & KEY_LOOKUP_CREATE) { |
| 589 | ret = join_session_keyring(NULL); |
| 590 | if (ret < 0) |
| 591 | goto error; |
| 592 | goto reget_creds; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | } |
| 594 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 595 | rcu_read_lock(); |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 596 | key = rcu_dereference(ctx.cred->session_keyring); |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 597 | __key_get(key); |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 598 | rcu_read_unlock(); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 599 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | break; |
| 601 | |
| 602 | case KEY_SPEC_USER_KEYRING: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 603 | if (!ctx.cred->user->uid_keyring) { |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 604 | ret = install_user_keyrings(); |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 605 | if (ret < 0) |
| 606 | goto error; |
| 607 | } |
| 608 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 609 | key = ctx.cred->user->uid_keyring; |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 610 | __key_get(key); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 611 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | break; |
| 613 | |
| 614 | case KEY_SPEC_USER_SESSION_KEYRING: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 615 | if (!ctx.cred->user->session_keyring) { |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 616 | ret = install_user_keyrings(); |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 617 | if (ret < 0) |
| 618 | goto error; |
| 619 | } |
| 620 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 621 | key = ctx.cred->user->session_keyring; |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 622 | __key_get(key); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 623 | key_ref = make_key_ref(key, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | break; |
| 625 | |
| 626 | case KEY_SPEC_GROUP_KEYRING: |
| 627 | /* group keyrings are not yet supported */ |
Dan Carpenter | 4d09ec0 | 2010-05-17 14:42:35 +0100 | [diff] [blame] | 628 | key_ref = ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | goto error; |
| 630 | |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 631 | case KEY_SPEC_REQKEY_AUTH_KEY: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 632 | key = ctx.cred->request_key_auth; |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 633 | if (!key) |
| 634 | goto error; |
| 635 | |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 636 | __key_get(key); |
David Howells | b5f545c | 2006-01-08 01:02:47 -0800 | [diff] [blame] | 637 | key_ref = make_key_ref(key, 1); |
| 638 | break; |
| 639 | |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 640 | case KEY_SPEC_REQUESTOR_KEYRING: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 641 | if (!ctx.cred->request_key_auth) |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 642 | goto error; |
| 643 | |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 644 | down_read(&ctx.cred->request_key_auth->sem); |
Dan Carpenter | f67dabb | 2012-03-06 13:32:16 +0000 | [diff] [blame] | 645 | if (test_bit(KEY_FLAG_REVOKED, |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 646 | &ctx.cred->request_key_auth->flags)) { |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 647 | key_ref = ERR_PTR(-EKEYREVOKED); |
| 648 | key = NULL; |
| 649 | } else { |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 650 | rka = ctx.cred->request_key_auth->payload.data; |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 651 | key = rka->dest_keyring; |
David Howells | ccc3e6d | 2013-09-24 10:35:16 +0100 | [diff] [blame] | 652 | __key_get(key); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 653 | } |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 654 | up_read(&ctx.cred->request_key_auth->sem); |
David Howells | 8bbf4976 | 2008-11-14 10:39:14 +1100 | [diff] [blame] | 655 | if (!key) |
| 656 | goto error; |
| 657 | key_ref = make_key_ref(key, 1); |
| 658 | break; |
| 659 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | default: |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 661 | key_ref = ERR_PTR(-EINVAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | if (id < 1) |
| 663 | goto error; |
| 664 | |
| 665 | key = key_lookup(id); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 666 | if (IS_ERR(key)) { |
David Howells | e231c2e | 2008-02-07 00:15:26 -0800 | [diff] [blame] | 667 | key_ref = ERR_CAST(key); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | goto error; |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 669 | } |
| 670 | |
| 671 | key_ref = make_key_ref(key, 0); |
| 672 | |
| 673 | /* check to see if we possess the key */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 674 | ctx.index_key.type = key->type; |
| 675 | ctx.index_key.description = key->description; |
| 676 | ctx.index_key.desc_len = strlen(key->description); |
David Howells | 4629195 | 2014-09-16 17:36:02 +0100 | [diff] [blame] | 677 | ctx.match_data.raw_data = key; |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 678 | kdebug("check possessed"); |
| 679 | skey_ref = search_process_keyrings(&ctx); |
| 680 | kdebug("possessed=%p", skey_ref); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 681 | |
| 682 | if (!IS_ERR(skey_ref)) { |
| 683 | key_put(key); |
| 684 | key_ref = skey_ref; |
| 685 | } |
| 686 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | break; |
| 688 | } |
| 689 | |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 690 | /* unlink does not use the nominated key in any way, so can skip all |
| 691 | * the permission checks as it is only concerned with the keyring */ |
| 692 | if (lflags & KEY_LOOKUP_FOR_UNLINK) { |
| 693 | ret = 0; |
| 694 | goto error; |
| 695 | } |
| 696 | |
| 697 | if (!(lflags & KEY_LOOKUP_PARTIAL)) { |
David Howells | 76181c1 | 2007-10-16 23:29:46 -0700 | [diff] [blame] | 698 | ret = wait_for_key_construction(key, true); |
| 699 | switch (ret) { |
| 700 | case -ERESTARTSYS: |
| 701 | goto invalid_key; |
| 702 | default: |
| 703 | if (perm) |
| 704 | goto invalid_key; |
| 705 | case 0: |
| 706 | break; |
| 707 | } |
| 708 | } else if (perm) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | ret = key_validate(key); |
| 710 | if (ret < 0) |
| 711 | goto invalid_key; |
| 712 | } |
| 713 | |
| 714 | ret = -EIO; |
David Howells | 5593122 | 2009-09-02 09:13:45 +0100 | [diff] [blame] | 715 | if (!(lflags & KEY_LOOKUP_PARTIAL) && |
| 716 | !test_bit(KEY_FLAG_INSTANTIATED, &key->flags)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | goto invalid_key; |
| 718 | |
David Howells | 3e30148 | 2005-06-23 22:00:56 -0700 | [diff] [blame] | 719 | /* check the permissions */ |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 720 | ret = key_task_permission(key_ref, ctx.cred, perm); |
David Howells | 29db919 | 2005-10-30 15:02:44 -0800 | [diff] [blame] | 721 | if (ret < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | goto invalid_key; |
| 723 | |
David Howells | 31d5a79 | 2012-05-11 10:56:56 +0100 | [diff] [blame] | 724 | key->last_used_at = current_kernel_time().tv_sec; |
| 725 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 726 | error: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 727 | put_cred(ctx.cred); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 728 | return key_ref; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 730 | invalid_key: |
| 731 | key_ref_put(key_ref); |
| 732 | key_ref = ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | goto error; |
| 734 | |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 735 | /* if we attempted to install a keyring, then it may have caused new |
| 736 | * creds to be installed */ |
| 737 | reget_creds: |
David Howells | 4bdf0bc | 2013-09-24 10:35:15 +0100 | [diff] [blame] | 738 | put_cred(ctx.cred); |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 739 | goto try_again; |
David Howells | a8b17ed | 2011-01-20 16:38:27 +0000 | [diff] [blame] | 740 | } |
David Howells | bb952bb | 2008-11-14 10:39:20 +1100 | [diff] [blame] | 741 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 743 | * Join the named keyring as the session keyring if possible else attempt to |
| 744 | * create a new one of that name and join that. |
| 745 | * |
| 746 | * If the name is NULL, an empty anonymous keyring will be installed as the |
| 747 | * session keyring. |
| 748 | * |
| 749 | * Named session keyrings are joined with a semaphore held to prevent the |
| 750 | * keyrings from going away whilst the attempt is made to going them and also |
| 751 | * to prevent a race in creating compatible session keyrings. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 752 | */ |
| 753 | long join_session_keyring(const char *name) |
| 754 | { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 755 | const struct cred *old; |
| 756 | struct cred *new; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 757 | struct key *keyring; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 758 | long ret, serial; |
| 759 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 760 | new = prepare_creds(); |
| 761 | if (!new) |
| 762 | return -ENOMEM; |
| 763 | old = current_cred(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
| 765 | /* if no name is provided, install an anonymous keyring */ |
| 766 | if (!name) { |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 767 | ret = install_session_keyring_to_cred(new, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | if (ret < 0) |
| 769 | goto error; |
| 770 | |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 771 | serial = new->session_keyring->serial; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 772 | ret = commit_creds(new); |
| 773 | if (ret == 0) |
| 774 | ret = serial; |
| 775 | goto okay; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 776 | } |
| 777 | |
| 778 | /* allow the user to join or create a named keyring */ |
Ingo Molnar | bb003079 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 779 | mutex_lock(&key_session_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | |
| 781 | /* look for an existing keyring of this name */ |
David Howells | 69664cf | 2008-04-29 01:01:31 -0700 | [diff] [blame] | 782 | keyring = find_keyring_by_name(name, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 783 | if (PTR_ERR(keyring) == -ENOKEY) { |
| 784 | /* not found - try and create a new one */ |
David Howells | 96b5c8f | 2012-10-02 19:24:56 +0100 | [diff] [blame] | 785 | keyring = keyring_alloc( |
| 786 | name, old->uid, old->gid, old, |
| 787 | KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ | KEY_USR_LINK, |
| 788 | KEY_ALLOC_IN_QUOTA, NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | if (IS_ERR(keyring)) { |
| 790 | ret = PTR_ERR(keyring); |
David Howells | bcf945d | 2005-08-04 13:07:06 -0700 | [diff] [blame] | 791 | goto error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 792 | } |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 793 | } else if (IS_ERR(keyring)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 794 | ret = PTR_ERR(keyring); |
| 795 | goto error2; |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 796 | } else if (keyring == new->session_keyring) { |
| 797 | ret = 0; |
| 798 | goto error2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | } |
| 800 | |
| 801 | /* we've got a keyring - now to install it */ |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 802 | ret = install_session_keyring_to_cred(new, keyring); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 803 | if (ret < 0) |
| 804 | goto error2; |
| 805 | |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 806 | commit_creds(new); |
| 807 | mutex_unlock(&key_session_mutex); |
| 808 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 809 | ret = keyring->serial; |
| 810 | key_put(keyring); |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 811 | okay: |
| 812 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 814 | error2: |
Ingo Molnar | bb003079 | 2006-03-22 00:09:14 -0800 | [diff] [blame] | 815 | mutex_unlock(&key_session_mutex); |
David Howells | 664cceb | 2005-09-28 17:03:15 +0100 | [diff] [blame] | 816 | error: |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 817 | abort_creds(new); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | return ret; |
David Howells | d84f4f9 | 2008-11-14 10:39:23 +1100 | [diff] [blame] | 819 | } |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 820 | |
| 821 | /* |
David Howells | 973c9f4 | 2011-01-20 16:38:33 +0000 | [diff] [blame] | 822 | * Replace a process's session keyring on behalf of one of its children when |
| 823 | * the target process is about to resume userspace execution. |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 824 | */ |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 825 | void key_change_session_keyring(struct callback_head *twork) |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 826 | { |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 827 | const struct cred *old = current_cred(); |
Al Viro | 67d1214 | 2012-06-27 11:07:19 +0400 | [diff] [blame] | 828 | struct cred *new = container_of(twork, struct cred, rcu); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 829 | |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 830 | if (unlikely(current->flags & PF_EXITING)) { |
| 831 | put_cred(new); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 832 | return; |
Oleg Nesterov | 413cd3d | 2012-05-11 10:59:08 +1000 | [diff] [blame] | 833 | } |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 834 | |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 835 | new-> uid = old-> uid; |
| 836 | new-> euid = old-> euid; |
| 837 | new-> suid = old-> suid; |
| 838 | new->fsuid = old->fsuid; |
| 839 | new-> gid = old-> gid; |
| 840 | new-> egid = old-> egid; |
| 841 | new-> sgid = old-> sgid; |
| 842 | new->fsgid = old->fsgid; |
| 843 | new->user = get_uid(old->user); |
Eric W. Biederman | ba0e342 | 2013-03-02 19:14:03 -0800 | [diff] [blame] | 844 | new->user_ns = get_user_ns(old->user_ns); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 845 | new->group_info = get_group_info(old->group_info); |
| 846 | |
| 847 | new->securebits = old->securebits; |
| 848 | new->cap_inheritable = old->cap_inheritable; |
| 849 | new->cap_permitted = old->cap_permitted; |
| 850 | new->cap_effective = old->cap_effective; |
| 851 | new->cap_bset = old->cap_bset; |
| 852 | |
| 853 | new->jit_keyring = old->jit_keyring; |
| 854 | new->thread_keyring = key_get(old->thread_keyring); |
David Howells | 3a50597 | 2012-10-02 19:24:29 +0100 | [diff] [blame] | 855 | new->process_keyring = key_get(old->process_keyring); |
David Howells | ee18d64 | 2009-09-02 09:14:21 +0100 | [diff] [blame] | 856 | |
| 857 | security_transfer_creds(new, old); |
| 858 | |
| 859 | commit_creds(new); |
| 860 | } |
Mimi Zohar | c124bde | 2013-09-04 13:26:22 +0100 | [diff] [blame] | 861 | |
| 862 | /* |
| 863 | * Make sure that root's user and user-session keyrings exist. |
| 864 | */ |
| 865 | static int __init init_root_keyring(void) |
| 866 | { |
| 867 | return install_user_keyrings(); |
| 868 | } |
| 869 | |
| 870 | late_initcall(init_root_keyring); |