Release 4.15 security/keys/request_key_auth.c
/* Request key authorisation token key definition.
*
* Copyright (C) 2005 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (dhowells@redhat.com)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* See Documentation/security/keys/request-key.rst
*/
#include <linux/module.h>
#include <linux/sched.h>
#include <linux/err.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/uaccess.h>
#include "internal.h"
#include <keys/user-type.h>
static int request_key_auth_preparse(struct key_preparsed_payload *);
static void request_key_auth_free_preparse(struct key_preparsed_payload *);
static int request_key_auth_instantiate(struct key *,
struct key_preparsed_payload *);
static void request_key_auth_describe(const struct key *, struct seq_file *);
static void request_key_auth_revoke(struct key *);
static void request_key_auth_destroy(struct key *);
static long request_key_auth_read(const struct key *, char __user *, size_t);
/*
* The request-key authorisation key type definition.
*/
struct key_type key_type_request_key_auth = {
.name = ".request_key_auth",
.def_datalen = sizeof(struct request_key_auth),
.preparse = request_key_auth_preparse,
.free_preparse = request_key_auth_free_preparse,
.instantiate = request_key_auth_instantiate,
.describe = request_key_auth_describe,
.revoke = request_key_auth_revoke,
.destroy = request_key_auth_destroy,
.read = request_key_auth_read,
};
static int request_key_auth_preparse(struct key_preparsed_payload *prep)
{
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 14 | 100.00% | 2 | 100.00% |
| Total | 14 | 100.00% | 2 | 100.00% |
static void request_key_auth_free_preparse(struct key_preparsed_payload *prep)
{
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 10 | 100.00% | 2 | 100.00% |
| Total | 10 | 100.00% | 2 | 100.00% |
/*
* Instantiate a request-key authorisation key.
*/
static int request_key_auth_instantiate(struct key *key,
struct key_preparsed_payload *prep)
{
key->payload.data[0] = (struct request_key_auth *)prep->data;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 37 | 100.00% | 4 | 100.00% |
| Total | 37 | 100.00% | 4 | 100.00% |
/*
* Describe an authorisation token.
*/
static void request_key_auth_describe(const struct key *key,
struct seq_file *m)
{
struct request_key_auth *rka = key->payload.data[0];
seq_puts(m, "key:");
seq_puts(m, key->description);
if (key_is_positive(key))
seq_printf(m, " pid:%d ci:%zu", rka->pid, rka->callout_len);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 69 | 100.00% | 6 | 100.00% |
| Total | 69 | 100.00% | 6 | 100.00% |
/*
* Read the callout_info data (retrieves the callout information).
* - the key's semaphore is read-locked
*/
static long request_key_auth_read(const struct key *key,
char __user *buffer, size_t buflen)
{
struct request_key_auth *rka = key->payload.data[0];
size_t datalen;
long ret;
datalen = rka->callout_len;
ret = datalen;
/* we can return the data as is */
if (buffer && buflen > 0) {
if (buflen > datalen)
buflen = datalen;
if (copy_to_user(buffer, rka->callout_info, buflen) != 0)
ret = -EFAULT;
}
return ret;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 94 | 100.00% | 3 | 100.00% |
| Total | 94 | 100.00% | 3 | 100.00% |
/*
* Handle revocation of an authorisation token key.
*
* Called with the key sem write-locked.
*/
static void request_key_auth_revoke(struct key *key)
{
struct request_key_auth *rka = key->payload.data[0];
kenter("{%d}", key->serial);
if (rka->cred) {
put_cred(rka->cred);
rka->cred = NULL;
}
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 55 | 100.00% | 3 | 100.00% |
| Total | 55 | 100.00% | 3 | 100.00% |
static void free_request_key_auth(struct request_key_auth *rka)
{
if (!rka)
return;
key_put(rka->target_key);
key_put(rka->dest_keyring);
if (rka->cred)
put_cred(rka->cred);
kfree(rka->callout_info);
kfree(rka);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 35 | 62.50% | 4 | 80.00% |
| Eric Biggers | 21 | 37.50% | 1 | 20.00% |
| Total | 56 | 100.00% | 5 | 100.00% |
/*
* Destroy an instantiation authorisation token key.
*/
static void request_key_auth_destroy(struct key *key)
{
struct request_key_auth *rka = key->payload.data[0];
kenter("{%d}", key->serial);
free_request_key_auth(rka);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Eric Biggers | 30 | 76.92% | 1 | 25.00% |
| David Howells | 9 | 23.08% | 3 | 75.00% |
| Total | 39 | 100.00% | 4 | 100.00% |
/*
* Create an authorisation token for /sbin/request-key or whoever to gain
* access to the caller's security data.
*/
struct key *request_key_auth_new(struct key *target, const void *callout_info,
size_t callout_len, struct key *dest_keyring)
{
struct request_key_auth *rka, *irka;
const struct cred *cred = current->cred;
struct key *authkey = NULL;
char desc[20];
int ret = -ENOMEM;
kenter("%d,", target->serial);
/* allocate a auth record */
rka = kzalloc(sizeof(*rka), GFP_KERNEL);
if (!rka)
goto error;
rka->callout_info = kmemdup(callout_info, callout_len, GFP_KERNEL);
if (!rka->callout_info)
goto error_free_rka;
rka->callout_len = callout_len;
/* see if the calling process is already servicing the key request of
* another process */
if (cred->request_key_auth) {
/* it is - use that instantiation context here too */
down_read(&cred->request_key_auth->sem);
/* if the auth key has been revoked, then the key we're
* servicing is already instantiated */
if (test_bit(KEY_FLAG_REVOKED,
&cred->request_key_auth->flags)) {
up_read(&cred->request_key_auth->sem);
ret = -EKEYREVOKED;
goto error_free_rka;
}
irka = cred->request_key_auth->payload.data[0];
rka->cred = get_cred(irka->cred);
rka->pid = irka->pid;
up_read(&cred->request_key_auth->sem);
}
else {
/* it isn't - use this process as the context */
rka->cred = get_cred(cred);
rka->pid = current->pid;
}
rka->target_key = key_get(target);
rka->dest_keyring = key_get(dest_keyring);
/* allocate the auth key */
sprintf(desc, "%x", target->serial);
authkey = key_alloc(&key_type_request_key_auth, desc,
cred->fsuid, cred->fsgid, cred,
KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
KEY_USR_VIEW, KEY_ALLOC_NOT_IN_QUOTA, NULL);
if (IS_ERR(authkey)) {
ret = PTR_ERR(authkey);
goto error_free_rka;
}
/* construct the auth key */
ret = key_instantiate_and_link(authkey, rka, 0, NULL, NULL);
if (ret < 0)
goto error_put_authkey;
kleave(" = {%d,%d}", authkey->serial, refcount_read(&authkey->usage));
return authkey;
error_put_authkey:
key_put(authkey);
error_free_rka:
free_request_key_auth(rka);
error:
kleave("= %d", ret);
return ERR_PTR(ret);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 349 | 88.35% | 12 | 75.00% |
| Eric Biggers | 44 | 11.14% | 2 | 12.50% |
| Elena Reshetova | 1 | 0.25% | 1 | 6.25% |
| Michael LeMay | 1 | 0.25% | 1 | 6.25% |
| Total | 395 | 100.00% | 16 | 100.00% |
/*
* Search the current process's keyrings for the authorisation key for
* instantiation of a key.
*/
struct key *key_get_instantiation_authkey(key_serial_t target_id)
{
char description[16];
struct keyring_search_context ctx = {
.index_key.type = &key_type_request_key_auth,
.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,
};
struct key *authkey;
key_ref_t authkey_ref;
sprintf(description, "%x", target_id);
authkey_ref = search_process_keyrings(&ctx);
if (IS_ERR(authkey_ref)) {
authkey = ERR_CAST(authkey_ref);
if (authkey == ERR_PTR(-EAGAIN))
authkey = ERR_PTR(-ENOKEY);
goto error;
}
authkey = key_ref_to_ptr(authkey_ref);
if (test_bit(KEY_FLAG_REVOKED, &authkey->flags)) {
key_put(authkey);
authkey = ERR_PTR(-EKEYREVOKED);
}
error:
return authkey;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 170 | 100.00% | 10 | 100.00% |
| Total | 170 | 100.00% | 10 | 100.00% |
Overall Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| David Howells | 1003 | 90.69% | 26 | 78.79% |
| Eric Biggers | 96 | 8.68% | 2 | 6.06% |
| Robert P. J. Day | 3 | 0.27% | 1 | 3.03% |
| Michael LeMay | 1 | 0.09% | 1 | 3.03% |
| Linus Torvalds | 1 | 0.09% | 1 | 3.03% |
| Kees Cook | 1 | 0.09% | 1 | 3.03% |
| Elena Reshetova | 1 | 0.09% | 1 | 3.03% |
| Total | 1106 | 100.00% | 33 | 100.00% |
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