auth_none.c

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#include <linux/ceph/ceph_debug.h>

#include <linux/err.h>
#include <linux/module.h>
#include <linux/random.h>
#include <linux/slab.h>

#include <linux/ceph/decode.h>
#include <linux/ceph/auth.h>

#include "auth_none.h"

static void reset(struct ceph_auth_client *ac)
{
    struct ceph_auth_none_info *xi = ac->private;

    xi->starting = true;
    xi->built_authorizer = false;
}

static void destroy(struct ceph_auth_client *ac)
{
    kfree(ac->private);
    ac->private = NULL;
}

static int is_authenticated(struct ceph_auth_client *ac)
{
    struct ceph_auth_none_info *xi = ac->private;

    return !xi->starting;
}

static int should_authenticate(struct ceph_auth_client *ac)
{
    struct ceph_auth_none_info *xi = ac->private;

    return xi->starting;
}

/*
 * the generic auth code decode the global_id, and we carry no actual
 * authenticate state, so nothing happens here.
 */
static int handle_reply(struct ceph_auth_client *ac, int result,
            void *buf, void *end)
{
    struct ceph_auth_none_info *xi = ac->private;

    xi->starting = false;
    return result;
}

/*
 * build an 'authorizer' with our entity_name and global_id.  we can
 * reuse a single static copy since it is identical for all services
 * we connect to.
 */
static int ceph_auth_none_create_authorizer(
    struct ceph_auth_client *ac, int peer_type,
    struct ceph_auth_handshake *auth)
{
    struct ceph_auth_none_info *ai = ac->private;
    struct ceph_none_authorizer *au = &ai->au;
    void *p, *end;
    int ret;

    if (!ai->built_authorizer) {
        p = au->buf;
        end = p + sizeof(au->buf);
        ceph_encode_8(&p, 1);
        ret = ceph_entity_name_encode(ac->name, &p, end - 8);
        if (ret < 0)
            goto bad;
        ceph_decode_need(&p, end, sizeof(u64), bad2);
        ceph_encode_64(&p, ac->global_id);
        au->buf_len = p - (void *)au->buf;
        ai->built_authorizer = true;
        dout("built authorizer len %d\n", au->buf_len);
    }

    auth->authorizer = (struct ceph_authorizer *) au;
    auth->authorizer_buf = au->buf;
    auth->authorizer_buf_len = au->buf_len;
    auth->authorizer_reply_buf = au->reply_buf;
    auth->authorizer_reply_buf_len = sizeof (au->reply_buf);

    return 0;

bad2:
    ret = -ERANGE;
bad:
    return ret;
}

static void ceph_auth_none_destroy_authorizer(struct ceph_auth_client *ac,
                      struct ceph_authorizer *a)
{
    /* nothing to do */
}

static const struct ceph_auth_client_ops ceph_auth_none_ops = {
    .name = "none",
    .reset = reset,
    .destroy = destroy,
    .is_authenticated = is_authenticated,
    .should_authenticate = should_authenticate,
    .handle_reply = handle_reply,
    .create_authorizer = ceph_auth_none_create_authorizer,
    .destroy_authorizer = ceph_auth_none_destroy_authorizer,
};

int ceph_auth_none_init(struct ceph_auth_client *ac)
{
    struct ceph_auth_none_info *xi;

    dout("ceph_auth_none_init %p\n", ac);
    xi = kzalloc(sizeof(*xi), GFP_NOFS);
    if (!xi)
        return -ENOMEM;

    xi->starting = true;
    xi->built_authorizer = false;

    ac->protocol = CEPH_AUTH_NONE;
    ac->private = xi;
    ac->ops = &ceph_auth_none_ops;
    return 0;
}