#include <linux/sched.h>
#include <linux/err.h>
#include <linux/seq_file.h>
+#include <linux/slab.h>
#include <asm/uaccess.h>
#include "internal.h"
static int request_key_auth_instantiate(struct key *, const void *, size_t);
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);
.def_datalen = sizeof(struct request_key_auth),
.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,
};
seq_puts(m, "key:");
seq_puts(m, key->description);
- seq_printf(m, " pid:%d ci:%zu", rka->pid, strlen(rka->callout_info));
+ seq_printf(m, " pid:%d ci:%zu", rka->pid, rka->callout_len);
} /* end request_key_auth_describe() */
size_t datalen;
long ret;
- datalen = strlen(rka->callout_info);
+ datalen = rka->callout_len;
ret = datalen;
/* we can return the data as is */
/*****************************************************************************/
/*
+ * 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;
+
+ kenter("{%d}", key->serial);
+
+ if (rka->cred) {
+ put_cred(rka->cred);
+ rka->cred = NULL;
+ }
+
+} /* end request_key_auth_revoke() */
+
+/*****************************************************************************/
+/*
* destroy an instantiation authorisation token key
*/
static void request_key_auth_destroy(struct key *key)
kenter("{%d}", key->serial);
+ if (rka->cred) {
+ put_cred(rka->cred);
+ rka->cred = NULL;
+ }
+
key_put(rka->target_key);
+ key_put(rka->dest_keyring);
+ kfree(rka->callout_info);
kfree(rka);
} /* end request_key_auth_destroy() */
* 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 char *callout_info)
+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;
kleave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
+ rka->callout_info = kmalloc(callout_len, GFP_KERNEL);
+ if (!rka->callout_info) {
+ kleave(" = -ENOMEM");
+ kfree(rka);
+ return ERR_PTR(-ENOMEM);
+ }
/* see if the calling process is already servicing the key request of
* another process */
- if (current->request_key_auth) {
+ if (cred->request_key_auth) {
/* it is - use that instantiation context here too */
- irka = current->request_key_auth->payload.data;
- rka->context = irka->context;
+ 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))
+ goto auth_key_revoked;
+
+ irka = cred->request_key_auth->payload.data;
+ 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->context = current;
+ rka->cred = get_cred(cred);
rka->pid = current->pid;
}
rka->target_key = key_get(target);
- rka->callout_info = callout_info;
+ rka->dest_keyring = key_get(dest_keyring);
+ memcpy(rka->callout_info, callout_info, callout_len);
+ rka->callout_len = callout_len;
/* allocate the auth key */
sprintf(desc, "%x", target->serial);
authkey = key_alloc(&key_type_request_key_auth, desc,
- current->fsuid, current->fsgid,
+ cred->fsuid, cred->fsgid, cred,
KEY_POS_VIEW | KEY_POS_READ | KEY_POS_SEARCH |
- KEY_USR_VIEW, 1);
+ KEY_USR_VIEW, KEY_ALLOC_NOT_IN_QUOTA);
if (IS_ERR(authkey)) {
ret = PTR_ERR(authkey);
goto error_alloc;
}
- /* construct and attach to the keyring */
+ /* construct the auth key */
ret = key_instantiate_and_link(authkey, rka, 0, NULL, NULL);
if (ret < 0)
goto error_inst;
- kleave(" = {%d})", authkey->serial);
+ kleave(" = {%d,%d}", authkey->serial, atomic_read(&authkey->usage));
return authkey;
+auth_key_revoked:
+ up_read(&cred->request_key_auth->sem);
+ kfree(rka->callout_info);
+ kfree(rka);
+ kleave("= -EKEYREVOKED");
+ return ERR_PTR(-EKEYREVOKED);
+
error_inst:
key_revoke(authkey);
key_put(authkey);
error_alloc:
key_put(rka->target_key);
+ key_put(rka->dest_keyring);
+ kfree(rka->callout_info);
kfree(rka);
kleave("= %d", ret);
return ERR_PTR(ret);
*/
struct key *key_get_instantiation_authkey(key_serial_t target_id)
{
+ const struct cred *cred = current_cred();
struct key *authkey;
key_ref_t authkey_ref;
&key_type_request_key_auth,
(void *) (unsigned long) target_id,
key_get_instantiation_authkey_match,
- current);
+ cred);
if (IS_ERR(authkey_ref)) {
- authkey = ERR_PTR(PTR_ERR(authkey_ref));
+ authkey = ERR_CAST(authkey_ref);
goto error;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff