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![Kees Cook](/assets/img/avatar_default.png)
Adjusts for ReST markup and moves under keys security devel index. Cc: David Howells <dhowells@redhat.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
727 lines
20 KiB
C
727 lines
20 KiB
C
/* Request a key from userspace
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*
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* Copyright (C) 2004-2007 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* See Documentation/security/keys/request-key.rst
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/kmod.h>
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#include <linux/err.h>
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#include <linux/keyctl.h>
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#include <linux/slab.h>
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#include "internal.h"
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#define key_negative_timeout 60 /* default timeout on a negative key's existence */
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/**
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* complete_request_key - Complete the construction of a key.
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* @cons: The key construction record.
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* @error: The success or failute of the construction.
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*
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* Complete the attempt to construct a key. The key will be negated
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* if an error is indicated. The authorisation key will be revoked
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* unconditionally.
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*/
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void complete_request_key(struct key_construction *cons, int error)
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{
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kenter("{%d,%d},%d", cons->key->serial, cons->authkey->serial, error);
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if (error < 0)
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key_negate_and_link(cons->key, key_negative_timeout, NULL,
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cons->authkey);
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else
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key_revoke(cons->authkey);
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key_put(cons->key);
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key_put(cons->authkey);
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kfree(cons);
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}
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EXPORT_SYMBOL(complete_request_key);
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/*
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* Initialise a usermode helper that is going to have a specific session
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* keyring.
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*
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* This is called in context of freshly forked kthread before kernel_execve(),
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* so we can simply install the desired session_keyring at this point.
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*/
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static int umh_keys_init(struct subprocess_info *info, struct cred *cred)
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{
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struct key *keyring = info->data;
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return install_session_keyring_to_cred(cred, keyring);
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}
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/*
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* Clean up a usermode helper with session keyring.
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*/
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static void umh_keys_cleanup(struct subprocess_info *info)
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{
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struct key *keyring = info->data;
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key_put(keyring);
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}
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/*
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* Call a usermode helper with a specific session keyring.
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*/
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static int call_usermodehelper_keys(const char *path, char **argv, char **envp,
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struct key *session_keyring, int wait)
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{
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struct subprocess_info *info;
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info = call_usermodehelper_setup(path, argv, envp, GFP_KERNEL,
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umh_keys_init, umh_keys_cleanup,
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session_keyring);
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if (!info)
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return -ENOMEM;
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key_get(session_keyring);
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return call_usermodehelper_exec(info, wait);
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}
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/*
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* Request userspace finish the construction of a key
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* - execute "/sbin/request-key <op> <key> <uid> <gid> <keyring> <keyring> <keyring>"
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*/
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static int call_sbin_request_key(struct key_construction *cons,
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const char *op,
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void *aux)
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{
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static char const request_key[] = "/sbin/request-key";
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const struct cred *cred = current_cred();
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key_serial_t prkey, sskey;
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struct key *key = cons->key, *authkey = cons->authkey, *keyring,
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*session;
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char *argv[9], *envp[3], uid_str[12], gid_str[12];
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char key_str[12], keyring_str[3][12];
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char desc[20];
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int ret, i;
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kenter("{%d},{%d},%s", key->serial, authkey->serial, op);
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ret = install_user_keyrings();
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if (ret < 0)
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goto error_alloc;
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/* allocate a new session keyring */
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sprintf(desc, "_req.%u", key->serial);
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cred = get_current_cred();
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keyring = keyring_alloc(desc, cred->fsuid, cred->fsgid, cred,
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KEY_POS_ALL | KEY_USR_VIEW | KEY_USR_READ,
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KEY_ALLOC_QUOTA_OVERRUN, NULL, NULL);
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put_cred(cred);
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if (IS_ERR(keyring)) {
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ret = PTR_ERR(keyring);
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goto error_alloc;
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}
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/* attach the auth key to the session keyring */
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ret = key_link(keyring, authkey);
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if (ret < 0)
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goto error_link;
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/* record the UID and GID */
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sprintf(uid_str, "%d", from_kuid(&init_user_ns, cred->fsuid));
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sprintf(gid_str, "%d", from_kgid(&init_user_ns, cred->fsgid));
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/* we say which key is under construction */
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sprintf(key_str, "%d", key->serial);
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/* we specify the process's default keyrings */
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sprintf(keyring_str[0], "%d",
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cred->thread_keyring ? cred->thread_keyring->serial : 0);
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prkey = 0;
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if (cred->process_keyring)
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prkey = cred->process_keyring->serial;
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sprintf(keyring_str[1], "%d", prkey);
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rcu_read_lock();
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session = rcu_dereference(cred->session_keyring);
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if (!session)
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session = cred->user->session_keyring;
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sskey = session->serial;
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rcu_read_unlock();
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sprintf(keyring_str[2], "%d", sskey);
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/* set up a minimal environment */
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i = 0;
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envp[i++] = "HOME=/";
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envp[i++] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
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envp[i] = NULL;
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/* set up the argument list */
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i = 0;
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argv[i++] = (char *)request_key;
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argv[i++] = (char *) op;
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argv[i++] = key_str;
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argv[i++] = uid_str;
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argv[i++] = gid_str;
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argv[i++] = keyring_str[0];
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argv[i++] = keyring_str[1];
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argv[i++] = keyring_str[2];
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argv[i] = NULL;
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/* do it */
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ret = call_usermodehelper_keys(request_key, argv, envp, keyring,
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UMH_WAIT_PROC);
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kdebug("usermode -> 0x%x", ret);
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if (ret >= 0) {
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/* ret is the exit/wait code */
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if (test_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags) ||
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key_validate(key) < 0)
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ret = -ENOKEY;
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else
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/* ignore any errors from userspace if the key was
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* instantiated */
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ret = 0;
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}
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error_link:
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key_put(keyring);
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error_alloc:
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complete_request_key(cons, ret);
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kleave(" = %d", ret);
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return ret;
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}
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/*
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* Call out to userspace for key construction.
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*
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* Program failure is ignored in favour of key status.
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*/
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static int construct_key(struct key *key, const void *callout_info,
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size_t callout_len, void *aux,
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struct key *dest_keyring)
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{
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struct key_construction *cons;
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request_key_actor_t actor;
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struct key *authkey;
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int ret;
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kenter("%d,%p,%zu,%p", key->serial, callout_info, callout_len, aux);
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cons = kmalloc(sizeof(*cons), GFP_KERNEL);
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if (!cons)
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return -ENOMEM;
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/* allocate an authorisation key */
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authkey = request_key_auth_new(key, callout_info, callout_len,
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dest_keyring);
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if (IS_ERR(authkey)) {
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kfree(cons);
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ret = PTR_ERR(authkey);
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authkey = NULL;
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} else {
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cons->authkey = key_get(authkey);
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cons->key = key_get(key);
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/* make the call */
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actor = call_sbin_request_key;
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if (key->type->request_key)
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actor = key->type->request_key;
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ret = actor(cons, "create", aux);
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/* check that the actor called complete_request_key() prior to
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* returning an error */
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WARN_ON(ret < 0 &&
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!test_bit(KEY_FLAG_REVOKED, &authkey->flags));
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key_put(authkey);
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}
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kleave(" = %d", ret);
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return ret;
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}
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/*
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* Get the appropriate destination keyring for the request.
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*
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* The keyring selected is returned with an extra reference upon it which the
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* caller must release.
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*/
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static void construct_get_dest_keyring(struct key **_dest_keyring)
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{
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struct request_key_auth *rka;
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const struct cred *cred = current_cred();
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struct key *dest_keyring = *_dest_keyring, *authkey;
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kenter("%p", dest_keyring);
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/* find the appropriate keyring */
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if (dest_keyring) {
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/* the caller supplied one */
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key_get(dest_keyring);
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} else {
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/* use a default keyring; falling through the cases until we
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* find one that we actually have */
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switch (cred->jit_keyring) {
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case KEY_REQKEY_DEFL_DEFAULT:
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case KEY_REQKEY_DEFL_REQUESTOR_KEYRING:
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if (cred->request_key_auth) {
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authkey = cred->request_key_auth;
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down_read(&authkey->sem);
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rka = authkey->payload.data[0];
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if (!test_bit(KEY_FLAG_REVOKED,
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&authkey->flags))
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dest_keyring =
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key_get(rka->dest_keyring);
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up_read(&authkey->sem);
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if (dest_keyring)
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break;
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}
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case KEY_REQKEY_DEFL_THREAD_KEYRING:
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dest_keyring = key_get(cred->thread_keyring);
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if (dest_keyring)
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break;
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case KEY_REQKEY_DEFL_PROCESS_KEYRING:
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dest_keyring = key_get(cred->process_keyring);
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if (dest_keyring)
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break;
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case KEY_REQKEY_DEFL_SESSION_KEYRING:
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rcu_read_lock();
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dest_keyring = key_get(
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rcu_dereference(cred->session_keyring));
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rcu_read_unlock();
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if (dest_keyring)
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break;
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case KEY_REQKEY_DEFL_USER_SESSION_KEYRING:
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dest_keyring =
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key_get(cred->user->session_keyring);
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break;
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case KEY_REQKEY_DEFL_USER_KEYRING:
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dest_keyring = key_get(cred->user->uid_keyring);
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break;
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case KEY_REQKEY_DEFL_GROUP_KEYRING:
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default:
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BUG();
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}
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}
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*_dest_keyring = dest_keyring;
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kleave(" [dk %d]", key_serial(dest_keyring));
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return;
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}
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/*
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* Allocate a new key in under-construction state and attempt to link it in to
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* the requested keyring.
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*
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* May return a key that's already under construction instead if there was a
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* race between two thread calling request_key().
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*/
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static int construct_alloc_key(struct keyring_search_context *ctx,
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struct key *dest_keyring,
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unsigned long flags,
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struct key_user *user,
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struct key **_key)
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{
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struct assoc_array_edit *edit;
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struct key *key;
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key_perm_t perm;
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key_ref_t key_ref;
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int ret;
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kenter("%s,%s,,,",
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ctx->index_key.type->name, ctx->index_key.description);
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*_key = NULL;
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mutex_lock(&user->cons_lock);
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perm = KEY_POS_VIEW | KEY_POS_SEARCH | KEY_POS_LINK | KEY_POS_SETATTR;
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perm |= KEY_USR_VIEW;
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if (ctx->index_key.type->read)
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perm |= KEY_POS_READ;
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if (ctx->index_key.type == &key_type_keyring ||
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ctx->index_key.type->update)
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perm |= KEY_POS_WRITE;
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key = key_alloc(ctx->index_key.type, ctx->index_key.description,
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ctx->cred->fsuid, ctx->cred->fsgid, ctx->cred,
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perm, flags, NULL);
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if (IS_ERR(key))
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goto alloc_failed;
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set_bit(KEY_FLAG_USER_CONSTRUCT, &key->flags);
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if (dest_keyring) {
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ret = __key_link_begin(dest_keyring, &ctx->index_key, &edit);
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if (ret < 0)
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goto link_prealloc_failed;
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}
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/* attach the key to the destination keyring under lock, but we do need
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* to do another check just in case someone beat us to it whilst we
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* waited for locks */
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mutex_lock(&key_construction_mutex);
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key_ref = search_process_keyrings(ctx);
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if (!IS_ERR(key_ref))
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goto key_already_present;
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if (dest_keyring)
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__key_link(key, &edit);
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mutex_unlock(&key_construction_mutex);
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if (dest_keyring)
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__key_link_end(dest_keyring, &ctx->index_key, edit);
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mutex_unlock(&user->cons_lock);
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*_key = key;
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kleave(" = 0 [%d]", key_serial(key));
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return 0;
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/* the key is now present - we tell the caller that we found it by
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* returning -EINPROGRESS */
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key_already_present:
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key_put(key);
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mutex_unlock(&key_construction_mutex);
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key = key_ref_to_ptr(key_ref);
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if (dest_keyring) {
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ret = __key_link_check_live_key(dest_keyring, key);
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if (ret == 0)
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__key_link(key, &edit);
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__key_link_end(dest_keyring, &ctx->index_key, edit);
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if (ret < 0)
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goto link_check_failed;
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}
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mutex_unlock(&user->cons_lock);
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*_key = key;
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kleave(" = -EINPROGRESS [%d]", key_serial(key));
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return -EINPROGRESS;
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link_check_failed:
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mutex_unlock(&user->cons_lock);
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key_put(key);
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kleave(" = %d [linkcheck]", ret);
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return ret;
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link_prealloc_failed:
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mutex_unlock(&user->cons_lock);
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key_put(key);
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kleave(" = %d [prelink]", ret);
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return ret;
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alloc_failed:
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mutex_unlock(&user->cons_lock);
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kleave(" = %ld", PTR_ERR(key));
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return PTR_ERR(key);
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}
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/*
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* Commence key construction.
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*/
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static struct key *construct_key_and_link(struct keyring_search_context *ctx,
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const char *callout_info,
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size_t callout_len,
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void *aux,
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struct key *dest_keyring,
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unsigned long flags)
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{
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struct key_user *user;
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struct key *key;
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int ret;
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kenter("");
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if (ctx->index_key.type == &key_type_keyring)
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return ERR_PTR(-EPERM);
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user = key_user_lookup(current_fsuid());
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if (!user)
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return ERR_PTR(-ENOMEM);
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construct_get_dest_keyring(&dest_keyring);
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ret = construct_alloc_key(ctx, dest_keyring, flags, user, &key);
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key_user_put(user);
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if (ret == 0) {
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ret = construct_key(key, callout_info, callout_len, aux,
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dest_keyring);
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if (ret < 0) {
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kdebug("cons failed");
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goto construction_failed;
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}
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} else if (ret == -EINPROGRESS) {
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ret = 0;
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} else {
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goto couldnt_alloc_key;
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}
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key_put(dest_keyring);
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kleave(" = key %d", key_serial(key));
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return key;
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construction_failed:
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key_negate_and_link(key, key_negative_timeout, NULL, NULL);
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key_put(key);
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couldnt_alloc_key:
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key_put(dest_keyring);
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kleave(" = %d", ret);
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return ERR_PTR(ret);
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}
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/**
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* request_key_and_link - Request a key and cache it in a keyring.
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* @type: The type of key we want.
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* @description: The searchable description of the key.
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* @callout_info: The data to pass to the instantiation upcall (or NULL).
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* @callout_len: The length of callout_info.
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* @aux: Auxiliary data for the upcall.
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* @dest_keyring: Where to cache the key.
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* @flags: Flags to key_alloc().
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*
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* A key matching the specified criteria is searched for in the process's
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* keyrings and returned with its usage count incremented if found. Otherwise,
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* if callout_info is not NULL, a key will be allocated and some service
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* (probably in userspace) will be asked to instantiate it.
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*
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* If successfully found or created, the key will be linked to the destination
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* keyring if one is provided.
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*
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* Returns a pointer to the key if successful; -EACCES, -ENOKEY, -EKEYREVOKED
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* or -EKEYEXPIRED if an inaccessible, negative, revoked or expired key was
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* found; -ENOKEY if no key was found and no @callout_info was given; -EDQUOT
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* if insufficient key quota was available to create a new key; or -ENOMEM if
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* insufficient memory was available.
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*
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* If the returned key was created, then it may still be under construction,
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* and wait_for_key_construction() should be used to wait for that to complete.
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*/
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struct key *request_key_and_link(struct key_type *type,
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const char *description,
|
|
const void *callout_info,
|
|
size_t callout_len,
|
|
void *aux,
|
|
struct key *dest_keyring,
|
|
unsigned long flags)
|
|
{
|
|
struct keyring_search_context ctx = {
|
|
.index_key.type = type,
|
|
.index_key.description = description,
|
|
.cred = current_cred(),
|
|
.match_data.cmp = key_default_cmp,
|
|
.match_data.raw_data = description,
|
|
.match_data.lookup_type = KEYRING_SEARCH_LOOKUP_DIRECT,
|
|
.flags = (KEYRING_SEARCH_DO_STATE_CHECK |
|
|
KEYRING_SEARCH_SKIP_EXPIRED),
|
|
};
|
|
struct key *key;
|
|
key_ref_t key_ref;
|
|
int ret;
|
|
|
|
kenter("%s,%s,%p,%zu,%p,%p,%lx",
|
|
ctx.index_key.type->name, ctx.index_key.description,
|
|
callout_info, callout_len, aux, dest_keyring, flags);
|
|
|
|
if (type->match_preparse) {
|
|
ret = type->match_preparse(&ctx.match_data);
|
|
if (ret < 0) {
|
|
key = ERR_PTR(ret);
|
|
goto error;
|
|
}
|
|
}
|
|
|
|
/* search all the process keyrings for a key */
|
|
key_ref = search_process_keyrings(&ctx);
|
|
|
|
if (!IS_ERR(key_ref)) {
|
|
key = key_ref_to_ptr(key_ref);
|
|
if (dest_keyring) {
|
|
construct_get_dest_keyring(&dest_keyring);
|
|
ret = key_link(dest_keyring, key);
|
|
key_put(dest_keyring);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
key = ERR_PTR(ret);
|
|
goto error_free;
|
|
}
|
|
}
|
|
} else if (PTR_ERR(key_ref) != -EAGAIN) {
|
|
key = ERR_CAST(key_ref);
|
|
} else {
|
|
/* the search failed, but the keyrings were searchable, so we
|
|
* should consult userspace if we can */
|
|
key = ERR_PTR(-ENOKEY);
|
|
if (!callout_info)
|
|
goto error_free;
|
|
|
|
key = construct_key_and_link(&ctx, callout_info, callout_len,
|
|
aux, dest_keyring, flags);
|
|
}
|
|
|
|
error_free:
|
|
if (type->match_free)
|
|
type->match_free(&ctx.match_data);
|
|
error:
|
|
kleave(" = %p", key);
|
|
return key;
|
|
}
|
|
|
|
/**
|
|
* wait_for_key_construction - Wait for construction of a key to complete
|
|
* @key: The key being waited for.
|
|
* @intr: Whether to wait interruptibly.
|
|
*
|
|
* Wait for a key to finish being constructed.
|
|
*
|
|
* Returns 0 if successful; -ERESTARTSYS if the wait was interrupted; -ENOKEY
|
|
* if the key was negated; or -EKEYREVOKED or -EKEYEXPIRED if the key was
|
|
* revoked or expired.
|
|
*/
|
|
int wait_for_key_construction(struct key *key, bool intr)
|
|
{
|
|
int ret;
|
|
|
|
ret = wait_on_bit(&key->flags, KEY_FLAG_USER_CONSTRUCT,
|
|
intr ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
|
|
if (ret)
|
|
return -ERESTARTSYS;
|
|
if (test_bit(KEY_FLAG_NEGATIVE, &key->flags)) {
|
|
smp_rmb();
|
|
return key->reject_error;
|
|
}
|
|
return key_validate(key);
|
|
}
|
|
EXPORT_SYMBOL(wait_for_key_construction);
|
|
|
|
/**
|
|
* request_key - Request a key and wait for construction
|
|
* @type: Type of key.
|
|
* @description: The searchable description of the key.
|
|
* @callout_info: The data to pass to the instantiation upcall (or NULL).
|
|
*
|
|
* As for request_key_and_link() except that it does not add the returned key
|
|
* to a keyring if found, new keys are always allocated in the user's quota,
|
|
* the callout_info must be a NUL-terminated string and no auxiliary data can
|
|
* be passed.
|
|
*
|
|
* Furthermore, it then works as wait_for_key_construction() to wait for the
|
|
* completion of keys undergoing construction with a non-interruptible wait.
|
|
*/
|
|
struct key *request_key(struct key_type *type,
|
|
const char *description,
|
|
const char *callout_info)
|
|
{
|
|
struct key *key;
|
|
size_t callout_len = 0;
|
|
int ret;
|
|
|
|
if (callout_info)
|
|
callout_len = strlen(callout_info);
|
|
key = request_key_and_link(type, description, callout_info, callout_len,
|
|
NULL, NULL, KEY_ALLOC_IN_QUOTA);
|
|
if (!IS_ERR(key)) {
|
|
ret = wait_for_key_construction(key, false);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
return key;
|
|
}
|
|
EXPORT_SYMBOL(request_key);
|
|
|
|
/**
|
|
* request_key_with_auxdata - Request a key with auxiliary data for the upcaller
|
|
* @type: The type of key we want.
|
|
* @description: The searchable description of the key.
|
|
* @callout_info: The data to pass to the instantiation upcall (or NULL).
|
|
* @callout_len: The length of callout_info.
|
|
* @aux: Auxiliary data for the upcall.
|
|
*
|
|
* As for request_key_and_link() except that it does not add the returned key
|
|
* to a keyring if found and new keys are always allocated in the user's quota.
|
|
*
|
|
* Furthermore, it then works as wait_for_key_construction() to wait for the
|
|
* completion of keys undergoing construction with a non-interruptible wait.
|
|
*/
|
|
struct key *request_key_with_auxdata(struct key_type *type,
|
|
const char *description,
|
|
const void *callout_info,
|
|
size_t callout_len,
|
|
void *aux)
|
|
{
|
|
struct key *key;
|
|
int ret;
|
|
|
|
key = request_key_and_link(type, description, callout_info, callout_len,
|
|
aux, NULL, KEY_ALLOC_IN_QUOTA);
|
|
if (!IS_ERR(key)) {
|
|
ret = wait_for_key_construction(key, false);
|
|
if (ret < 0) {
|
|
key_put(key);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
return key;
|
|
}
|
|
EXPORT_SYMBOL(request_key_with_auxdata);
|
|
|
|
/*
|
|
* request_key_async - Request a key (allow async construction)
|
|
* @type: Type of key.
|
|
* @description: The searchable description of the key.
|
|
* @callout_info: The data to pass to the instantiation upcall (or NULL).
|
|
* @callout_len: The length of callout_info.
|
|
*
|
|
* As for request_key_and_link() except that it does not add the returned key
|
|
* to a keyring if found, new keys are always allocated in the user's quota and
|
|
* no auxiliary data can be passed.
|
|
*
|
|
* The caller should call wait_for_key_construction() to wait for the
|
|
* completion of the returned key if it is still undergoing construction.
|
|
*/
|
|
struct key *request_key_async(struct key_type *type,
|
|
const char *description,
|
|
const void *callout_info,
|
|
size_t callout_len)
|
|
{
|
|
return request_key_and_link(type, description, callout_info,
|
|
callout_len, NULL, NULL,
|
|
KEY_ALLOC_IN_QUOTA);
|
|
}
|
|
EXPORT_SYMBOL(request_key_async);
|
|
|
|
/*
|
|
* request a key with auxiliary data for the upcaller (allow async construction)
|
|
* @type: Type of key.
|
|
* @description: The searchable description of the key.
|
|
* @callout_info: The data to pass to the instantiation upcall (or NULL).
|
|
* @callout_len: The length of callout_info.
|
|
* @aux: Auxiliary data for the upcall.
|
|
*
|
|
* As for request_key_and_link() except that it does not add the returned key
|
|
* to a keyring if found and new keys are always allocated in the user's quota.
|
|
*
|
|
* The caller should call wait_for_key_construction() to wait for the
|
|
* completion of the returned key if it is still undergoing construction.
|
|
*/
|
|
struct key *request_key_async_with_auxdata(struct key_type *type,
|
|
const char *description,
|
|
const void *callout_info,
|
|
size_t callout_len,
|
|
void *aux)
|
|
{
|
|
return request_key_and_link(type, description, callout_info,
|
|
callout_len, aux, NULL, KEY_ALLOC_IN_QUOTA);
|
|
}
|
|
EXPORT_SYMBOL(request_key_async_with_auxdata);
|