2cb33cac62
A malicious monitor can craft an auth reply message that could cause a NULL function pointer dereference in the client's kernel. To prevent this, the auth_none protocol handler needs an empty ceph_auth_client_ops->build_request() function. CVE-2013-1059 Signed-off-by: Tyler Hicks <tyhicks@canonical.com> Reported-by: Chanam Park <chanam.park@hkpco.kr> Reviewed-by: Seth Arnold <seth.arnold@canonical.com> Reviewed-by: Sage Weil <sage@inktank.com> Cc: stable@vger.kernel.org
138 lines
3.0 KiB
C
138 lines
3.0 KiB
C
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#include <linux/ceph/ceph_debug.h>
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/ceph/decode.h>
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#include <linux/ceph/auth.h>
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#include "auth_none.h"
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static void reset(struct ceph_auth_client *ac)
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{
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struct ceph_auth_none_info *xi = ac->private;
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xi->starting = true;
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xi->built_authorizer = false;
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}
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static void destroy(struct ceph_auth_client *ac)
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{
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kfree(ac->private);
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ac->private = NULL;
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}
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static int is_authenticated(struct ceph_auth_client *ac)
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{
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struct ceph_auth_none_info *xi = ac->private;
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return !xi->starting;
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}
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static int should_authenticate(struct ceph_auth_client *ac)
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{
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struct ceph_auth_none_info *xi = ac->private;
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return xi->starting;
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}
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static int build_request(struct ceph_auth_client *ac, void *buf, void *end)
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{
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return 0;
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}
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/*
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* the generic auth code decode the global_id, and we carry no actual
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* authenticate state, so nothing happens here.
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*/
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static int handle_reply(struct ceph_auth_client *ac, int result,
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void *buf, void *end)
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{
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struct ceph_auth_none_info *xi = ac->private;
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xi->starting = false;
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return result;
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}
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/*
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* build an 'authorizer' with our entity_name and global_id. we can
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* reuse a single static copy since it is identical for all services
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* we connect to.
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*/
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static int ceph_auth_none_create_authorizer(
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struct ceph_auth_client *ac, int peer_type,
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struct ceph_auth_handshake *auth)
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{
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struct ceph_auth_none_info *ai = ac->private;
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struct ceph_none_authorizer *au = &ai->au;
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void *p, *end;
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int ret;
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if (!ai->built_authorizer) {
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p = au->buf;
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end = p + sizeof(au->buf);
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ceph_encode_8(&p, 1);
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ret = ceph_entity_name_encode(ac->name, &p, end - 8);
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if (ret < 0)
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goto bad;
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ceph_decode_need(&p, end, sizeof(u64), bad2);
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ceph_encode_64(&p, ac->global_id);
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au->buf_len = p - (void *)au->buf;
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ai->built_authorizer = true;
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dout("built authorizer len %d\n", au->buf_len);
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}
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auth->authorizer = (struct ceph_authorizer *) au;
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auth->authorizer_buf = au->buf;
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auth->authorizer_buf_len = au->buf_len;
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auth->authorizer_reply_buf = au->reply_buf;
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auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
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return 0;
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bad2:
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ret = -ERANGE;
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bad:
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return ret;
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}
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static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
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struct ceph_authorizer *a)
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{
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/* nothing to do */
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}
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static const struct ceph_auth_client_ops ceph_auth_none_ops = {
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.name = "none",
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.reset = reset,
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.destroy = destroy,
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.is_authenticated = is_authenticated,
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.should_authenticate = should_authenticate,
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.build_request = build_request,
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.handle_reply = handle_reply,
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.create_authorizer = ceph_auth_none_create_authorizer,
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.destroy_authorizer = ceph_auth_none_destroy_authorizer,
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};
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int ceph_auth_none_init(struct ceph_auth_client *ac)
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{
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struct ceph_auth_none_info *xi;
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dout("ceph_auth_none_init %p\n", ac);
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xi = kzalloc(sizeof(*xi), GFP_NOFS);
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if (!xi)
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return -ENOMEM;
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xi->starting = true;
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xi->built_authorizer = false;
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ac->protocol = CEPH_AUTH_NONE;
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ac->private = xi;
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ac->ops = &ceph_auth_none_ops;
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return 0;
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}
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