From 0a990e7093566ceb07e38951e1a01686923d4f09 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Mon, 15 Mar 2010 16:12:25 -0700 Subject: [PATCH] ceph: clean up service ticket decoding Previously we would decode state directly into our current ticket_handler. This is problematic if for some reason we fail to decode, because we end up with half new state and half old state. We are probably already in bad shape if we get an update we can't decode, but we may as well be tidy anyway. Decode into new_* temporaries and update the ticket_handler only on success. Signed-off-by: Sage Weil --- fs/ceph/auth_x.c | 28 ++++++++++++++++++++-------- 1 file changed, 20 insertions(+), 8 deletions(-) diff --git a/fs/ceph/auth_x.c b/fs/ceph/auth_x.c index 33d3ad4dc456..8d8a84964763 100644 --- a/fs/ceph/auth_x.c +++ b/fs/ceph/auth_x.c @@ -156,7 +156,11 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, struct timespec validity; struct ceph_crypto_key old_key; void *tp, *tpend; + struct ceph_timespec new_validity; + struct ceph_crypto_key new_session_key; struct ceph_buffer *new_ticket_blob; + unsigned long new_expires, new_renew_after; + u64 new_secret_id; ceph_decode_need(&p, end, sizeof(u32) + 1, bad); @@ -189,16 +193,16 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, goto bad; memcpy(&old_key, &th->session_key, sizeof(old_key)); - ret = ceph_crypto_key_decode(&th->session_key, &dp, dend); + ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); if (ret) goto out; - ceph_decode_copy(&dp, &th->validity, sizeof(th->validity)); - ceph_decode_timespec(&validity, &th->validity); - th->expires = get_seconds() + validity.tv_sec; - th->renew_after = th->expires - (validity.tv_sec / 4); - dout(" expires=%lu renew_after=%lu\n", th->expires, - th->renew_after); + ceph_decode_copy(&dp, &new_validity, sizeof(new_validity)); + ceph_decode_timespec(&validity, &new_validity); + new_expires = get_seconds() + validity.tv_sec; + new_renew_after = new_expires - (validity.tv_sec / 4); + dout(" expires=%lu renew_after=%lu\n", new_expires, + new_renew_after); /* ticket blob for service */ ceph_decode_8_safe(&p, end, is_enc, bad); @@ -223,13 +227,21 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, dout(" ticket blob is %d bytes\n", dlen); ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad); struct_v = ceph_decode_8(&tp); - th->secret_id = ceph_decode_64(&tp); + new_secret_id = ceph_decode_64(&tp); ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend); if (ret) goto out; + + /* all is well, update our ticket */ + ceph_crypto_key_destroy(&th->session_key); if (th->ticket_blob) ceph_buffer_put(th->ticket_blob); + th->session_key = new_session_key; th->ticket_blob = new_ticket_blob; + th->validity = new_validity; + th->secret_id = new_secret_id; + th->expires = new_expires; + th->renew_after = new_renew_after; dout(" got ticket service %d (%s) secret_id %lld len %d\n", type, ceph_entity_type_name(type), th->secret_id, (int)th->ticket_blob->vec.iov_len);