libceph: add process_one_ticket() helper

Add a helper for processing individual cephx auth tickets.  Needed for
the next commit, which deals with allocating ticket buffers.  (Most of
the diff here is whitespace - view with git diff -b).

Cc: stable@vger.kernel.org
Signed-off-by: Ilya Dryomov <ilya.dryomov@inktank.com>
Reviewed-by: Sage Weil <sage@redhat.com>

1 files changed, 124 insertions, 104 deletions

diff --git a/net/ceph/auth_x.c b/net/ceph/auth_x.c
index 96238ba95f2b..0eb146dce1aa 100644
--- a/net/ceph/auth_x.c
+++ b/net/ceph/auth_x.c
@@ -129,17 +129,131 @@ static void remove_ticket_handler(struct ceph_auth_client *ac,
         kfree(th);
 }
 
+static int process_one_ticket(struct ceph_auth_client *ac,
+                              struct ceph_crypto_key *secret,
+                              void **p, void *end,
+                              void *dbuf, void *ticket_buf)
+{
+        struct ceph_x_info *xi = ac->private;
+        int type;
+        u8 tkt_struct_v, blob_struct_v;
+        struct ceph_x_ticket_handler *th;
+        void *dp, *dend;
+        int dlen;
+        char is_enc;
+        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;
+        int ret;
+
+        ceph_decode_need(p, end, sizeof(u32) + 1, bad);
+
+        type = ceph_decode_32(p);
+        dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
+
+        tkt_struct_v = ceph_decode_8(p);
+        if (tkt_struct_v != 1)
+                goto bad;
+
+        th = get_ticket_handler(ac, type);
+        if (IS_ERR(th)) {
+                ret = PTR_ERR(th);
+                goto out;
+        }
+
+        /* blob for me */
+        dlen = ceph_x_decrypt(secret, p, end, dbuf,
+                              TEMP_TICKET_BUF_LEN);
+        if (dlen <= 0) {
+                ret = dlen;
+                goto out;
+        }
+        dout(" decrypted %d bytes\n", dlen);
+        dp = dbuf;
+        dend = dp + dlen;
+
+        tkt_struct_v = ceph_decode_8(&dp);
+        if (tkt_struct_v != 1)
+                goto bad;
+
+        memcpy(&old_key, &th->session_key, sizeof(old_key));
+        ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
+        if (ret)
+                goto out;
+
+        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);
+        tp = ticket_buf;
+        if (is_enc) {
+                /* encrypted */
+                dout(" encrypted ticket\n");
+                dlen = ceph_x_decrypt(&old_key, p, end, ticket_buf,
+                                      TEMP_TICKET_BUF_LEN);
+                if (dlen < 0) {
+                        ret = dlen;
+                        goto out;
+                }
+                dlen = ceph_decode_32(&tp);
+        } else {
+                /* unencrypted */
+                ceph_decode_32_safe(p, end, dlen, bad);
+                ceph_decode_need(p, end, dlen, bad);
+                ceph_decode_copy(p, ticket_buf, dlen);
+        }
+        tpend = tp + dlen;
+        dout(" ticket blob is %d bytes\n", dlen);
+        ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
+        blob_struct_v = ceph_decode_8(&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);
+        xi->have_keys |= th->service;
+
+out:
+        return ret;
+
+bad:
+        ret = -EINVAL;
+        goto out;
+}
+
 static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
                                     struct ceph_crypto_key *secret,
                                     void *buf, void *end)
 {
-        struct ceph_x_info *xi = ac->private;
-        int num;
         void *p = buf;
-        int ret;
         char *dbuf;
         char *ticket_buf;
         u8 reply_struct_v;
+        u32 num;
+        int ret;
 
         dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
         if (!dbuf)
@@ -150,112 +264,18 @@ static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
         if (!ticket_buf)
                 goto out_dbuf;
 
-        ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
-        reply_struct_v = ceph_decode_8(&p);
+        ceph_decode_8_safe(&p, end, reply_struct_v, bad);
         if (reply_struct_v != 1)
-                goto bad;
-        num = ceph_decode_32(&p);
-        dout("%d tickets\n", num);
-        while (num--) {
-                int type;
-                u8 tkt_struct_v, blob_struct_v;
-                struct ceph_x_ticket_handler *th;
-                void *dp, *dend;
-                int dlen;
-                char is_enc;
-                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);
-
-                type = ceph_decode_32(&p);
-                dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
-
-                tkt_struct_v = ceph_decode_8(&p);
-                if (tkt_struct_v != 1)
-                        goto bad;
-
-                th = get_ticket_handler(ac, type);
-                if (IS_ERR(th)) {
-                        ret = PTR_ERR(th);
-                        goto out;
-                }
-
-                /* blob for me */
-                dlen = ceph_x_decrypt(secret, &p, end, dbuf,
-                                      TEMP_TICKET_BUF_LEN);
-                if (dlen <= 0) {
-                        ret = dlen;
-                        goto out;
-                }
-                dout(" decrypted %d bytes\n", dlen);
-                dend = dbuf + dlen;
-                dp = dbuf;
-
-                tkt_struct_v = ceph_decode_8(&dp);
-                if (tkt_struct_v != 1)
-                        goto bad;
+                return -EINVAL;
 
-                memcpy(&old_key, &th->session_key, sizeof(old_key));
-                ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
-                if (ret)
-                        goto out;
+        ceph_decode_32_safe(&p, end, num, bad);
+        dout("%d tickets\n", num);
 
-                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);
-                tp = ticket_buf;
-                if (is_enc) {
-                        /* encrypted */
-                        dout(" encrypted ticket\n");
-                        dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
-                                              TEMP_TICKET_BUF_LEN);
-                        if (dlen < 0) {
-                                ret = dlen;
-                                goto out;
-                        }
-                        dlen = ceph_decode_32(&tp);
-                } else {
-                        /* unencrypted */
-                        ceph_decode_32_safe(&p, end, dlen, bad);
-                        ceph_decode_need(&p, end, dlen, bad);
-                        ceph_decode_copy(&p, ticket_buf, dlen);
-                }
-                tpend = tp + dlen;
-                dout(" ticket blob is %d bytes\n", dlen);
-                ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
-                blob_struct_v = ceph_decode_8(&tp);
-                new_secret_id = ceph_decode_64(&tp);
-                ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
+        while (num--) {
+                ret = process_one_ticket(ac, secret, &p, end,
+                                         dbuf, ticket_buf);
                 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);
-                xi->have_keys |= th->service;
         }
 
         ret = 0;