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libceph: Get secret from the kernel keys api when mounting with key=NAME.

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Signed-off-by: Tommi Virtanen <tommi.virtanen@dreamhost.com>
Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Tommi Virtanen 2011-03-25 16:40:48 -07:00 committed by Sage Weil
parent 8323c3aa74
commit e2c3d29b42
2 changed files with 59 additions and 0 deletions
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1
net/ceph/Kconfig
View file

@ -4,6 +4,7 @@ config CEPH_LIB
select LIBCRC32C
select CRYPTO_AES
select CRYPTO
select KEYS
default n
help
Choose Y or M here to include cephlib, which provides the

58
net/ceph/ceph_common.c
View file

@ -5,6 +5,8 @@
#include <linux/fs.h>
#include <linux/inet.h>
#include <linux/in6.h>
#include <linux/key.h>
#include <keys/user-type.h>
#include <linux/module.h>
#include <linux/mount.h>
#include <linux/parser.h>
@ -197,6 +199,7 @@ enum {
Opt_fsid,
Opt_name,
Opt_secret,
Opt_key,
Opt_ip,
Opt_last_string,
/* string args above */
@ -213,6 +216,7 @@ static match_table_t opt_tokens = {
{Opt_fsid, "fsid=%s"},
{Opt_name, "name=%s"},
{Opt_secret, "secret=%s"},
{Opt_key, "key=%s"},
{Opt_ip, "ip=%s"},
/* string args above */
{Opt_noshare, "noshare"},
@ -232,6 +236,50 @@ void ceph_destroy_options(struct ceph_options *opt)
}
EXPORT_SYMBOL(ceph_destroy_options);
/* get secret from key store */
static int get_secret(struct ceph_crypto_key *dst, const char *name) {
struct key *ukey;
int key_err;
int err = 0;
struct user_key_payload *payload;
void *p;
ukey = request_key(&key_type_user, name, NULL);
if (!ukey || IS_ERR(ukey)) {
/* request_key errors don't map nicely to mount(2)
errors; don't even try, but still printk */
key_err = PTR_ERR(ukey);
switch (key_err) {
case -ENOKEY:
pr_warning("ceph: Mount failed due to key not found: %s\n", name);
break;
case -EKEYEXPIRED:
pr_warning("ceph: Mount failed due to expired key: %s\n", name);
break;
case -EKEYREVOKED:
pr_warning("ceph: Mount failed due to revoked key: %s\n", name);
break;
default:
pr_warning("ceph: Mount failed due to unknown key error"
" %d: %s\n", key_err, name);
}
err = -EPERM;
goto out;
}
payload = ukey->payload.data;
p = payload->data;
err = ceph_crypto_key_decode(dst, &p, p + payload->datalen);
if (err)
goto out_key;
/* pass through, err is 0 */
out_key:
key_put(ukey);
out:
return err;
}
int ceph_parse_options(struct ceph_options **popt, char *options,
const char *dev_name, const char *dev_name_end,
int (*parse_extra_token)(char *c, void *private),
@ -328,6 +376,16 @@ int ceph_parse_options(struct ceph_options **popt, char *options,
if (err < 0)
goto out;
break;
case Opt_key:
opt->key = kzalloc(sizeof(*opt->key), GFP_KERNEL);
if (!opt->key) {
err = -ENOMEM;
goto out;
}
err = get_secret(opt->key, argstr[0].from);
if (err < 0)
goto out;
break;
/* misc */
case Opt_osdtimeout: