[deliverable/linux.git] / net / ceph / auth_x.c


#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 "crypto.h"
#include "auth_x.h"
#include "auth_x_protocol.h"

static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);

static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
{
	struct ceph_x_info *xi = ac->private;
	int need;

	ceph_x_validate_tickets(ac, &need);
	dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
	     ac->want_keys, need, xi->have_keys);
	return (ac->want_keys & xi->have_keys) == ac->want_keys;
}

static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
{
	struct ceph_x_info *xi = ac->private;
	int need;

	ceph_x_validate_tickets(ac, &need);
	dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
	     ac->want_keys, need, xi->have_keys);
	return need != 0;
}

static int ceph_x_encrypt_buflen(int ilen)
{
	return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
		sizeof(u32);
}

static int ceph_x_encrypt(struct ceph_crypto_key *secret,
			  void *ibuf, int ilen, void *obuf, size_t olen)
{
	struct ceph_x_encrypt_header head = {
		.struct_v = 1,
		.magic = cpu_to_le64(CEPHX_ENC_MAGIC)
	};
	size_t len = olen - sizeof(u32);
	int ret;

	ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
			    &head, sizeof(head), ibuf, ilen);
	if (ret)
		return ret;
	ceph_encode_32(&obuf, len);
	return len + sizeof(u32);
}

static int ceph_x_decrypt(struct ceph_crypto_key *secret,
			  void **p, void *end, void **obuf, size_t olen)
{
	struct ceph_x_encrypt_header head;
	size_t head_len = sizeof(head);
	int len, ret;

	len = ceph_decode_32(p);
	if (*p + len > end)
		return -EINVAL;

	dout("ceph_x_decrypt len %d\n", len);
	if (*obuf == NULL) {
		*obuf = kmalloc(len, GFP_NOFS);
		if (!*obuf)
			return -ENOMEM;
		olen = len;
	}

	ret = ceph_decrypt2(secret, &head, &head_len, *obuf, &olen, *p, len);
	if (ret)
		return ret;
	if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
		return -EPERM;
	*p += len;
	return olen;
}

/*
 * get existing (or insert new) ticket handler
 */
static struct ceph_x_ticket_handler *
get_ticket_handler(struct ceph_auth_client *ac, int service)
{
	struct ceph_x_ticket_handler *th;
	struct ceph_x_info *xi = ac->private;
	struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;

	while (*p) {
		parent = *p;
		th = rb_entry(parent, struct ceph_x_ticket_handler, node);
		if (service < th->service)
			p = &(*p)->rb_left;
		else if (service > th->service)
			p = &(*p)->rb_right;
		else
			return th;
	}

	/* add it */
	th = kzalloc(sizeof(*th), GFP_NOFS);
	if (!th)
		return ERR_PTR(-ENOMEM);
	th->service = service;
	rb_link_node(&th->node, parent, p);
	rb_insert_color(&th->node, &xi->ticket_handlers);
	return th;
}

static void remove_ticket_handler(struct ceph_auth_client *ac,
				  struct ceph_x_ticket_handler *th)
{
	struct ceph_x_info *xi = ac->private;

	dout("remove_ticket_handler %p %d\n", th, th->service);
	rb_erase(&th->node, &xi->ticket_handlers);
	ceph_crypto_key_destroy(&th->session_key);
	if (th->ticket_blob)
		ceph_buffer_put(th->ticket_blob);
	kfree(th);
}

static int process_one_ticket(struct ceph_auth_client *ac,
			      struct ceph_crypto_key *secret,
			      void **p, void *end)
{
	struct ceph_x_info *xi = ac->private;
	int type;
	u8 tkt_struct_v, blob_struct_v;
	struct ceph_x_ticket_handler *th;
	void *dbuf = NULL;
	void *dp, *dend;
	int dlen;
	char is_enc;
	struct timespec validity;
	struct ceph_crypto_key old_key;
	void *ticket_buf = NULL;
	void *tp, *tpend;
	void **ptp;
	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, 0);
	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);
	if (is_enc) {
		/* encrypted */
		dout(" encrypted ticket\n");
		dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0);
		if (dlen < 0) {
			ret = dlen;
			goto out;
		}
		tp = ticket_buf;
		ptp = &tp;
		tpend = *ptp + dlen;
	} else {
		/* unencrypted */
		ptp = p;
		tpend = end;
	}
	ceph_decode_32_safe(ptp, tpend, dlen, bad);
	dout(" ticket blob is %d bytes\n", dlen);
	ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
	blob_struct_v = ceph_decode_8(ptp);
	new_secret_id = ceph_decode_64(ptp);
	ret = ceph_decode_buffer(&new_ticket_blob, ptp, 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:
	kfree(ticket_buf);
	kfree(dbuf);
	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)
{
	void *p = buf;
	u8 reply_struct_v;
	u32 num;
	int ret;

	ceph_decode_8_safe(&p, end, reply_struct_v, bad);
	if (reply_struct_v != 1)
		return -EINVAL;

	ceph_decode_32_safe(&p, end, num, bad);
	dout("%d tickets\n", num);

	while (num--) {
		ret = process_one_ticket(ac, secret, &p, end);
		if (ret)
			return ret;
	}

	return 0;

bad:
	return -EINVAL;
}

static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
				   struct ceph_x_ticket_handler *th,
				   struct ceph_x_authorizer *au)
{
	int maxlen;
	struct ceph_x_authorize_a *msg_a;
	struct ceph_x_authorize_b msg_b;
	void *p, *end;
	int ret;
	int ticket_blob_len =
		(th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);

	dout("build_authorizer for %s %p\n",
	     ceph_entity_type_name(th->service), au);

	maxlen = sizeof(*msg_a) + sizeof(msg_b) +
		ceph_x_encrypt_buflen(ticket_blob_len);
	dout("  need len %d\n", maxlen);
	if (au->buf && au->buf->alloc_len < maxlen) {
		ceph_buffer_put(au->buf);
		au->buf = NULL;
	}
	if (!au->buf) {
		au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
		if (!au->buf)
			return -ENOMEM;
	}
	au->service = th->service;
	au->secret_id = th->secret_id;

	msg_a = au->buf->vec.iov_base;
	msg_a->struct_v = 1;
	msg_a->global_id = cpu_to_le64(ac->global_id);
	msg_a->service_id = cpu_to_le32(th->service);
	msg_a->ticket_blob.struct_v = 1;
	msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
	msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
	if (ticket_blob_len) {
		memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
		       th->ticket_blob->vec.iov_len);
	}
	dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
	     le64_to_cpu(msg_a->ticket_blob.secret_id));

	p = msg_a + 1;
	p += ticket_blob_len;
	end = au->buf->vec.iov_base + au->buf->vec.iov_len;

	get_random_bytes(&au->nonce, sizeof(au->nonce));
	msg_b.struct_v = 1;
	msg_b.nonce = cpu_to_le64(au->nonce);
	ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
			     p, end - p);
	if (ret < 0)
		goto out_buf;
	p += ret;
	au->buf->vec.iov_len = p - au->buf->vec.iov_base;
	dout(" built authorizer nonce %llx len %d\n", au->nonce,
	     (int)au->buf->vec.iov_len);
	BUG_ON(au->buf->vec.iov_len > maxlen);
	return 0;

out_buf:
	ceph_buffer_put(au->buf);
	au->buf = NULL;
	return ret;
}

static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
				void **p, void *end)
{
	ceph_decode_need(p, end, 1 + sizeof(u64), bad);
	ceph_encode_8(p, 1);
	ceph_encode_64(p, th->secret_id);
	if (th->ticket_blob) {
		const char *buf = th->ticket_blob->vec.iov_base;
		u32 len = th->ticket_blob->vec.iov_len;

		ceph_encode_32_safe(p, end, len, bad);
		ceph_encode_copy_safe(p, end, buf, len, bad);
	} else {
		ceph_encode_32_safe(p, end, 0, bad);
	}

	return 0;
bad:
	return -ERANGE;
}

static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
{
	int want = ac->want_keys;
	struct ceph_x_info *xi = ac->private;
	int service;

	*pneed = ac->want_keys & ~(xi->have_keys);

	for (service = 1; service <= want; service <<= 1) {
		struct ceph_x_ticket_handler *th;

		if (!(ac->want_keys & service))
			continue;

		if (*pneed & service)
			continue;

		th = get_ticket_handler(ac, service);

		if (IS_ERR(th)) {
			*pneed |= service;
			continue;
		}

		if (get_seconds() >= th->renew_after)
			*pneed |= service;
		if (get_seconds() >= th->expires)
			xi->have_keys &= ~service;
	}
}


static int ceph_x_build_request(struct ceph_auth_client *ac,
				void *buf, void *end)
{
	struct ceph_x_info *xi = ac->private;
	int need;
	struct ceph_x_request_header *head = buf;
	int ret;
	struct ceph_x_ticket_handler *th =
		get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);

	if (IS_ERR(th))
		return PTR_ERR(th);

	ceph_x_validate_tickets(ac, &need);

	dout("build_request want %x have %x need %x\n",
	     ac->want_keys, xi->have_keys, need);

	if (need & CEPH_ENTITY_TYPE_AUTH) {
		struct ceph_x_authenticate *auth = (void *)(head + 1);
		void *p = auth + 1;
		struct ceph_x_challenge_blob tmp;
		char tmp_enc[40];
		u64 *u;

		if (p > end)
			return -ERANGE;

		dout(" get_auth_session_key\n");
		head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);

		/* encrypt and hash */
		get_random_bytes(&auth->client_challenge, sizeof(u64));
		tmp.client_challenge = auth->client_challenge;
		tmp.server_challenge = cpu_to_le64(xi->server_challenge);
		ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
				     tmp_enc, sizeof(tmp_enc));
		if (ret < 0)
			return ret;

		auth->struct_v = 1;
		auth->key = 0;
		for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
			auth->key ^= *(__le64 *)u;
		dout(" server_challenge %llx client_challenge %llx key %llx\n",
		     xi->server_challenge, le64_to_cpu(auth->client_challenge),
		     le64_to_cpu(auth->key));

		/* now encode the old ticket if exists */
		ret = ceph_x_encode_ticket(th, &p, end);
		if (ret < 0)
			return ret;

		return p - buf;
	}

	if (need) {
		void *p = head + 1;
		struct ceph_x_service_ticket_request *req;

		if (p > end)
			return -ERANGE;
		head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);

		ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
		if (ret)
			return ret;
		ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
				 xi->auth_authorizer.buf->vec.iov_len);

		req = p;
		req->keys = cpu_to_le32(need);
		p += sizeof(*req);
		return p - buf;
	}

	return 0;
}

static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
			       void *buf, void *end)
{
	struct ceph_x_info *xi = ac->private;
	struct ceph_x_reply_header *head = buf;
	struct ceph_x_ticket_handler *th;
	int len = end - buf;
	int op;
	int ret;

	if (result)
		return result;  /* XXX hmm? */

	if (xi->starting) {
		/* it's a hello */
		struct ceph_x_server_challenge *sc = buf;

		if (len != sizeof(*sc))
			return -EINVAL;
		xi->server_challenge = le64_to_cpu(sc->server_challenge);
		dout("handle_reply got server challenge %llx\n",
		     xi->server_challenge);
		xi->starting = false;
		xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
		return -EAGAIN;
	}

	op = le16_to_cpu(head->op);
	result = le32_to_cpu(head->result);
	dout("handle_reply op %d result %d\n", op, result);
	switch (op) {
	case CEPHX_GET_AUTH_SESSION_KEY:
		/* verify auth key */
		ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
					       buf + sizeof(*head), end);
		break;

	case CEPHX_GET_PRINCIPAL_SESSION_KEY:
		th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
		if (IS_ERR(th))
			return PTR_ERR(th);
		ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
					       buf + sizeof(*head), end);
		break;

	default:
		return -EINVAL;
	}
	if (ret)
		return ret;
	if (ac->want_keys == xi->have_keys)
		return 0;
	return -EAGAIN;
}

static int ceph_x_create_authorizer(
	struct ceph_auth_client *ac, int peer_type,
	struct ceph_auth_handshake *auth)
{
	struct ceph_x_authorizer *au;
	struct ceph_x_ticket_handler *th;
	int ret;

	th = get_ticket_handler(ac, peer_type);
	if (IS_ERR(th))
		return PTR_ERR(th);

	au = kzalloc(sizeof(*au), GFP_NOFS);
	if (!au)
		return -ENOMEM;

	ret = ceph_x_build_authorizer(ac, th, au);
	if (ret) {
		kfree(au);
		return ret;
	}

	auth->authorizer = (struct ceph_authorizer *) au;
	auth->authorizer_buf = au->buf->vec.iov_base;
	auth->authorizer_buf_len = au->buf->vec.iov_len;
	auth->authorizer_reply_buf = au->reply_buf;
	auth->authorizer_reply_buf_len = sizeof (au->reply_buf);

	return 0;
}

static int ceph_x_update_authorizer(
	struct ceph_auth_client *ac, int peer_type,
	struct ceph_auth_handshake *auth)
{
	struct ceph_x_authorizer *au;
	struct ceph_x_ticket_handler *th;

	th = get_ticket_handler(ac, peer_type);
	if (IS_ERR(th))
		return PTR_ERR(th);

	au = (struct ceph_x_authorizer *)auth->authorizer;
	if (au->secret_id < th->secret_id) {
		dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
		     au->service, au->secret_id, th->secret_id);
		return ceph_x_build_authorizer(ac, th, au);
	}
	return 0;
}

static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
					  struct ceph_authorizer *a, size_t len)
{
	struct ceph_x_authorizer *au = (void *)a;
	struct ceph_x_ticket_handler *th;
	int ret = 0;
	struct ceph_x_authorize_reply reply;
	void *preply = &reply;
	void *p = au->reply_buf;
	void *end = p + sizeof(au->reply_buf);

	th = get_ticket_handler(ac, au->service);
	if (IS_ERR(th))
		return PTR_ERR(th);
	ret = ceph_x_decrypt(&th->session_key, &p, end, &preply, sizeof(reply));
	if (ret < 0)
		return ret;
	if (ret != sizeof(reply))
		return -EPERM;

	if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
		ret = -EPERM;
	else
		ret = 0;
	dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
	     au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
	return ret;
}

static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
				      struct ceph_authorizer *a)
{
	struct ceph_x_authorizer *au = (void *)a;

	ceph_buffer_put(au->buf);
	kfree(au);
}


static void ceph_x_reset(struct ceph_auth_client *ac)
{
	struct ceph_x_info *xi = ac->private;

	dout("reset\n");
	xi->starting = true;
	xi->server_challenge = 0;
}

static void ceph_x_destroy(struct ceph_auth_client *ac)
{
	struct ceph_x_info *xi = ac->private;
	struct rb_node *p;

	dout("ceph_x_destroy %p\n", ac);
	ceph_crypto_key_destroy(&xi->secret);

	while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
		struct ceph_x_ticket_handler *th =
			rb_entry(p, struct ceph_x_ticket_handler, node);
		remove_ticket_handler(ac, th);
	}

	if (xi->auth_authorizer.buf)
		ceph_buffer_put(xi->auth_authorizer.buf);

	kfree(ac->private);
	ac->private = NULL;
}

static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
				   int peer_type)
{
	struct ceph_x_ticket_handler *th;

	th = get_ticket_handler(ac, peer_type);
	if (!IS_ERR(th))
		memset(&th->validity, 0, sizeof(th->validity));
}


static const struct ceph_auth_client_ops ceph_x_ops = {
	.name = "x",
	.is_authenticated = ceph_x_is_authenticated,
	.should_authenticate = ceph_x_should_authenticate,
	.build_request = ceph_x_build_request,
	.handle_reply = ceph_x_handle_reply,
	.create_authorizer = ceph_x_create_authorizer,
	.update_authorizer = ceph_x_update_authorizer,
	.verify_authorizer_reply = ceph_x_verify_authorizer_reply,
	.destroy_authorizer = ceph_x_destroy_authorizer,
	.invalidate_authorizer = ceph_x_invalidate_authorizer,
	.reset =  ceph_x_reset,
	.destroy = ceph_x_destroy,
};


int ceph_x_init(struct ceph_auth_client *ac)
{
	struct ceph_x_info *xi;
	int ret;

	dout("ceph_x_init %p\n", ac);
	ret = -ENOMEM;
	xi = kzalloc(sizeof(*xi), GFP_NOFS);
	if (!xi)
		goto out;

	ret = -EINVAL;
	if (!ac->key) {
		pr_err("no secret set (for auth_x protocol)\n");
		goto out_nomem;
	}

	ret = ceph_crypto_key_clone(&xi->secret, ac->key);
	if (ret < 0) {
		pr_err("cannot clone key: %d\n", ret);
		goto out_nomem;
	}

	xi->starting = true;
	xi->ticket_handlers = RB_ROOT;

	ac->protocol = CEPH_AUTH_CEPHX;
	ac->private = xi;
	ac->ops = &ceph_x_ops;
	return 0;

out_nomem:
	kfree(xi);
out:
	return ret;
}
Commit	Line	Data
ec0994e4	1
3d14c5d2	2	#include <linux/ceph/ceph_debug.h>
ec0994e4 SW	3
	4	#include <linux/err.h>
	5	#include <linux/module.h>
	6	#include <linux/random.h>
5a0e3ad6	7	#include <linux/slab.h>
ec0994e4	8
3d14c5d2 YS	9	#include <linux/ceph/decode.h>
	10	#include <linux/ceph/auth.h>
	11
	12	#include "crypto.h"
ec0994e4 SW	13	#include "auth_x.h"
ec0994e4 SW	14	#include "auth_x_protocol.h"
ec0994e4	15
ec0994e4 SW	16	static void ceph_x_validate_tickets(struct ceph_auth_client ac, int pneed);
	17
	18	static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
	19	{
	20	struct ceph_x_info *xi = ac->private;
	21	int need;
	22
	23	ceph_x_validate_tickets(ac, &need);
	24	dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
	25	ac->want_keys, need, xi->have_keys);
	26	return (ac->want_keys & xi->have_keys) == ac->want_keys;
	27	}
	28
a41359fa SW	29	static int ceph_x_should_authenticate(struct ceph_auth_client *ac)
	30	{
	31	struct ceph_x_info *xi = ac->private;
	32	int need;
	33
	34	ceph_x_validate_tickets(ac, &need);
	35	dout("ceph_x_should_authenticate want=%d need=%d have=%d\n",
	36	ac->want_keys, need, xi->have_keys);
	37	return need != 0;
	38	}
	39
807c86e2 SW	40	static int ceph_x_encrypt_buflen(int ilen)
	41	{
	42	return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
	43	sizeof(u32);
	44	}
	45
ec0994e4 SW	46	static int ceph_x_encrypt(struct ceph_crypto_key *secret,
	47	void ibuf, int ilen, void obuf, size_t olen)
	48	{
	49	struct ceph_x_encrypt_header head = {
	50	.struct_v = 1,
	51	.magic = cpu_to_le64(CEPHX_ENC_MAGIC)
	52	};
	53	size_t len = olen - sizeof(u32);
	54	int ret;
	55
	56	ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
	57	&head, sizeof(head), ibuf, ilen);
	58	if (ret)
	59	return ret;
	60	ceph_encode_32(&obuf, len);
	61	return len + sizeof(u32);
	62	}
	63
	64	static int ceph_x_decrypt(struct ceph_crypto_key *secret,
c27a3e4d	65	void *p, void end, void **obuf, size_t olen)
ec0994e4 SW	66	{
	67	struct ceph_x_encrypt_header head;
	68	size_t head_len = sizeof(head);
	69	int len, ret;
	70
	71	len = ceph_decode_32(p);
	72	if (*p + len > end)
	73	return -EINVAL;
	74
	75	dout("ceph_x_decrypt len %d\n", len);
c27a3e4d ID	76	if (*obuf == NULL) {
	77	*obuf = kmalloc(len, GFP_NOFS);
	78	if (!*obuf)
	79	return -ENOMEM;
	80	olen = len;
	81	}
	82
	83	ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen, p, len);
ec0994e4 SW	84	if (ret)
	85	return ret;
	86	if (head.struct_v != 1 \|\| le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
	87	return -EPERM;
	88	*p += len;
	89	return olen;
	90	}
	91
	92	/*
	93	* get existing (or insert new) ticket handler
	94	*/
cd84db6e YS	95	static struct ceph_x_ticket_handler *
cd84db6e YS	96	get_ticket_handler(struct ceph_auth_client *ac, int service)
ec0994e4 SW	97	{
	98	struct ceph_x_ticket_handler *th;
	99	struct ceph_x_info *xi = ac->private;
	100	struct rb_node parent = NULL, *p = &xi->ticket_handlers.rb_node;
	101
	102	while (*p) {
	103	parent = *p;
	104	th = rb_entry(parent, struct ceph_x_ticket_handler, node);
	105	if (service < th->service)
	106	p = &(*p)->rb_left;
	107	else if (service > th->service)
	108	p = &(*p)->rb_right;
	109	else
	110	return th;
	111	}
	112
	113	/* add it */
	114	th = kzalloc(sizeof(*th), GFP_NOFS);
	115	if (!th)
	116	return ERR_PTR(-ENOMEM);
	117	th->service = service;
	118	rb_link_node(&th->node, parent, p);
	119	rb_insert_color(&th->node, &xi->ticket_handlers);
	120	return th;
	121	}
	122
	123	static void remove_ticket_handler(struct ceph_auth_client *ac,
	124	struct ceph_x_ticket_handler *th)
	125	{
	126	struct ceph_x_info *xi = ac->private;
	127
	128	dout("remove_ticket_handler %p %d\n", th, th->service);
	129	rb_erase(&th->node, &xi->ticket_handlers);
	130	ceph_crypto_key_destroy(&th->session_key);
	131	if (th->ticket_blob)
	132	ceph_buffer_put(th->ticket_blob);
	133	kfree(th);
	134	}
	135
597cda35 ID	136	static int process_one_ticket(struct ceph_auth_client *ac,
597cda35 ID	137	struct ceph_crypto_key *secret,
c27a3e4d	138	void *p, void end)
597cda35 ID	139	{
	140	struct ceph_x_info *xi = ac->private;
	141	int type;
	142	u8 tkt_struct_v, blob_struct_v;
	143	struct ceph_x_ticket_handler *th;
c27a3e4d	144	void *dbuf = NULL;
597cda35 ID	145	void dp, dend;
	146	int dlen;
	147	char is_enc;
	148	struct timespec validity;
	149	struct ceph_crypto_key old_key;
c27a3e4d	150	void *ticket_buf = NULL;
597cda35	151	void tp, tpend;
e9226d7c	152	void **ptp;
597cda35 ID	153	struct ceph_timespec new_validity;
	154	struct ceph_crypto_key new_session_key;
	155	struct ceph_buffer *new_ticket_blob;
	156	unsigned long new_expires, new_renew_after;
	157	u64 new_secret_id;
	158	int ret;
	159
	160	ceph_decode_need(p, end, sizeof(u32) + 1, bad);
	161
	162	type = ceph_decode_32(p);
	163	dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
	164
	165	tkt_struct_v = ceph_decode_8(p);
	166	if (tkt_struct_v != 1)
	167	goto bad;
	168
	169	th = get_ticket_handler(ac, type);
	170	if (IS_ERR(th)) {
	171	ret = PTR_ERR(th);
	172	goto out;
	173	}
	174
	175	/* blob for me */
c27a3e4d	176	dlen = ceph_x_decrypt(secret, p, end, &dbuf, 0);
597cda35 ID	177	if (dlen <= 0) {
	178	ret = dlen;
	179	goto out;
	180	}
	181	dout(" decrypted %d bytes\n", dlen);
	182	dp = dbuf;
	183	dend = dp + dlen;
	184
	185	tkt_struct_v = ceph_decode_8(&dp);
	186	if (tkt_struct_v != 1)
	187	goto bad;
	188
	189	memcpy(&old_key, &th->session_key, sizeof(old_key));
	190	ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
	191	if (ret)
	192	goto out;
	193
	194	ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
	195	ceph_decode_timespec(&validity, &new_validity);
	196	new_expires = get_seconds() + validity.tv_sec;
	197	new_renew_after = new_expires - (validity.tv_sec / 4);
	198	dout(" expires=%lu renew_after=%lu\n", new_expires,
	199	new_renew_after);
	200
	201	/* ticket blob for service */
	202	ceph_decode_8_safe(p, end, is_enc, bad);
597cda35 ID	203	if (is_enc) {
	204	/* encrypted */
	205	dout(" encrypted ticket\n");
c27a3e4d	206	dlen = ceph_x_decrypt(&old_key, p, end, &ticket_buf, 0);
597cda35 ID	207	if (dlen < 0) {
	208	ret = dlen;
	209	goto out;
	210	}
c27a3e4d	211	tp = ticket_buf;
e9226d7c ID	212	ptp = &tp;
e9226d7c ID	213	tpend = *ptp + dlen;
597cda35 ID	214	} else {
597cda35 ID	215	/* unencrypted */
e9226d7c ID	216	ptp = p;
e9226d7c ID	217	tpend = end;
597cda35	218	}
e9226d7c	219	ceph_decode_32_safe(ptp, tpend, dlen, bad);
597cda35	220	dout(" ticket blob is %d bytes\n", dlen);
e9226d7c ID	221	ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
	222	blob_struct_v = ceph_decode_8(ptp);
	223	new_secret_id = ceph_decode_64(ptp);
	224	ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend);
597cda35 ID	225	if (ret)
	226	goto out;
	227
	228	/* all is well, update our ticket */
	229	ceph_crypto_key_destroy(&th->session_key);
	230	if (th->ticket_blob)
	231	ceph_buffer_put(th->ticket_blob);
	232	th->session_key = new_session_key;
	233	th->ticket_blob = new_ticket_blob;
	234	th->validity = new_validity;
	235	th->secret_id = new_secret_id;
	236	th->expires = new_expires;
	237	th->renew_after = new_renew_after;
	238	dout(" got ticket service %d (%s) secret_id %lld len %d\n",
	239	type, ceph_entity_type_name(type), th->secret_id,
	240	(int)th->ticket_blob->vec.iov_len);
	241	xi->have_keys \|= th->service;
	242
	243	out:
c27a3e4d ID	244	kfree(ticket_buf);
c27a3e4d ID	245	kfree(dbuf);
597cda35 ID	246	return ret;
	247
	248	bad:
	249	ret = -EINVAL;
	250	goto out;
	251	}
	252
ec0994e4 SW	253	static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
	254	struct ceph_crypto_key *secret,
	255	void buf, void end)
	256	{
ec0994e4	257	void *p = buf;
b736b3d9	258	u8 reply_struct_v;
597cda35 ID	259	u32 num;
597cda35 ID	260	int ret;
ec0994e4	261
597cda35	262	ceph_decode_8_safe(&p, end, reply_struct_v, bad);
b736b3d9	263	if (reply_struct_v != 1)
597cda35	264	return -EINVAL;
ec0994e4	265
597cda35 ID	266	ceph_decode_32_safe(&p, end, num, bad);
597cda35 ID	267	dout("%d tickets\n", num);
ec0994e4	268
597cda35	269	while (num--) {
c27a3e4d	270	ret = process_one_ticket(ac, secret, &p, end);
ec0994e4	271	if (ret)
c27a3e4d	272	return ret;
ec0994e4 SW	273	}
ec0994e4 SW	274
c27a3e4d	275	return 0;
ec0994e4 SW	276
ec0994e4 SW	277	bad:
c27a3e4d	278	return -EINVAL;
ec0994e4 SW	279	}
	280
	281	static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
	282	struct ceph_x_ticket_handler *th,
	283	struct ceph_x_authorizer *au)
	284	{
807c86e2	285	int maxlen;
ec0994e4 SW	286	struct ceph_x_authorize_a *msg_a;
	287	struct ceph_x_authorize_b msg_b;
	288	void p, end;
	289	int ret;
	290	int ticket_blob_len =
	291	(th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
	292
	293	dout("build_authorizer for %s %p\n",
	294	ceph_entity_type_name(th->service), au);
	295
807c86e2 SW	296	maxlen = sizeof(*msg_a) + sizeof(msg_b) +
	297	ceph_x_encrypt_buflen(ticket_blob_len);
	298	dout(" need len %d\n", maxlen);
	299	if (au->buf && au->buf->alloc_len < maxlen) {
ec0994e4 SW	300	ceph_buffer_put(au->buf);
	301	au->buf = NULL;
	302	}
	303	if (!au->buf) {
807c86e2	304	au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
ec0994e4 SW	305	if (!au->buf)
	306	return -ENOMEM;
	307	}
	308	au->service = th->service;
0bed9b5c	309	au->secret_id = th->secret_id;
ec0994e4 SW	310
	311	msg_a = au->buf->vec.iov_base;
	312	msg_a->struct_v = 1;
	313	msg_a->global_id = cpu_to_le64(ac->global_id);
	314	msg_a->service_id = cpu_to_le32(th->service);
	315	msg_a->ticket_blob.struct_v = 1;
	316	msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
	317	msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
	318	if (ticket_blob_len) {
	319	memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
	320	th->ticket_blob->vec.iov_len);
	321	}
	322	dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
	323	le64_to_cpu(msg_a->ticket_blob.secret_id));
	324
	325	p = msg_a + 1;
	326	p += ticket_blob_len;
	327	end = au->buf->vec.iov_base + au->buf->vec.iov_len;
	328
	329	get_random_bytes(&au->nonce, sizeof(au->nonce));
	330	msg_b.struct_v = 1;
	331	msg_b.nonce = cpu_to_le64(au->nonce);
	332	ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
	333	p, end - p);
	334	if (ret < 0)
	335	goto out_buf;
	336	p += ret;
	337	au->buf->vec.iov_len = p - au->buf->vec.iov_base;
	338	dout(" built authorizer nonce %llx len %d\n", au->nonce,
	339	(int)au->buf->vec.iov_len);
807c86e2	340	BUG_ON(au->buf->vec.iov_len > maxlen);
ec0994e4 SW	341	return 0;
	342
	343	out_buf:
	344	ceph_buffer_put(au->buf);
	345	au->buf = NULL;
	346	return ret;
	347	}
	348
	349	static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
	350	void *p, void end)
	351	{
	352	ceph_decode_need(p, end, 1 + sizeof(u64), bad);
	353	ceph_encode_8(p, 1);
	354	ceph_encode_64(p, th->secret_id);
	355	if (th->ticket_blob) {
	356	const char *buf = th->ticket_blob->vec.iov_base;
	357	u32 len = th->ticket_blob->vec.iov_len;
	358
	359	ceph_encode_32_safe(p, end, len, bad);
	360	ceph_encode_copy_safe(p, end, buf, len, bad);
	361	} else {
	362	ceph_encode_32_safe(p, end, 0, bad);
	363	}
	364
	365	return 0;
	366	bad:
	367	return -ERANGE;
	368	}
	369
	370	static void ceph_x_validate_tickets(struct ceph_auth_client ac, int pneed)
	371	{
	372	int want = ac->want_keys;
	373	struct ceph_x_info *xi = ac->private;
	374	int service;
	375
	376	*pneed = ac->want_keys & ~(xi->have_keys);
	377
	378	for (service = 1; service <= want; service <<= 1) {
	379	struct ceph_x_ticket_handler *th;
	380
	381	if (!(ac->want_keys & service))
	382	continue;
	383
	384	if (*pneed & service)
	385	continue;
	386
	387	th = get_ticket_handler(ac, service);
	388
b545787d	389	if (IS_ERR(th)) {
ec0994e4 SW	390	*pneed \|= service;
	391	continue;
	392	}
	393
	394	if (get_seconds() >= th->renew_after)
	395	*pneed \|= service;
	396	if (get_seconds() >= th->expires)
	397	xi->have_keys &= ~service;
	398	}
	399	}
	400
	401
	402	static int ceph_x_build_request(struct ceph_auth_client *ac,
	403	void buf, void end)
	404	{
	405	struct ceph_x_info *xi = ac->private;
	406	int need;
	407	struct ceph_x_request_header *head = buf;
	408	int ret;
	409	struct ceph_x_ticket_handler *th =
	410	get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
	411
b545787d DC	412	if (IS_ERR(th))
	413	return PTR_ERR(th);
	414
ec0994e4 SW	415	ceph_x_validate_tickets(ac, &need);
	416
	417	dout("build_request want %x have %x need %x\n",
	418	ac->want_keys, xi->have_keys, need);
	419
	420	if (need & CEPH_ENTITY_TYPE_AUTH) {
	421	struct ceph_x_authenticate auth = (void )(head + 1);
	422	void *p = auth + 1;
	423	struct ceph_x_challenge_blob tmp;
	424	char tmp_enc[40];
	425	u64 *u;
	426
	427	if (p > end)
	428	return -ERANGE;
	429
	430	dout(" get_auth_session_key\n");
	431	head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
	432
	433	/* encrypt and hash */
	434	get_random_bytes(&auth->client_challenge, sizeof(u64));
	435	tmp.client_challenge = auth->client_challenge;
	436	tmp.server_challenge = cpu_to_le64(xi->server_challenge);
	437	ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
	438	tmp_enc, sizeof(tmp_enc));
	439	if (ret < 0)
	440	return ret;
	441
	442	auth->struct_v = 1;
	443	auth->key = 0;
	444	for (u = (u64 )tmp_enc; u + 1 <= (u64 )(tmp_enc + ret); u++)
cd84db6e	445	auth->key ^= (__le64 )u;
ec0994e4 SW	446	dout(" server_challenge %llx client_challenge %llx key %llx\n",
	447	xi->server_challenge, le64_to_cpu(auth->client_challenge),
	448	le64_to_cpu(auth->key));
	449
	450	/* now encode the old ticket if exists */
	451	ret = ceph_x_encode_ticket(th, &p, end);
	452	if (ret < 0)
	453	return ret;
	454
	455	return p - buf;
	456	}
	457
	458	if (need) {
	459	void *p = head + 1;
	460	struct ceph_x_service_ticket_request *req;
	461
	462	if (p > end)
	463	return -ERANGE;
	464	head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
	465
ec0994e4 SW	466	ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
	467	if (ret)
	468	return ret;
	469	ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
	470	xi->auth_authorizer.buf->vec.iov_len);
	471
	472	req = p;
	473	req->keys = cpu_to_le32(need);
	474	p += sizeof(*req);
	475	return p - buf;
	476	}
	477
	478	return 0;
	479	}
	480
	481	static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
	482	void buf, void end)
	483	{
	484	struct ceph_x_info *xi = ac->private;
	485	struct ceph_x_reply_header *head = buf;
	486	struct ceph_x_ticket_handler *th;
	487	int len = end - buf;
	488	int op;
	489	int ret;
	490
	491	if (result)
	492	return result; /* XXX hmm? */
	493
	494	if (xi->starting) {
	495	/* it's a hello */
	496	struct ceph_x_server_challenge *sc = buf;
	497
	498	if (len != sizeof(*sc))
	499	return -EINVAL;
	500	xi->server_challenge = le64_to_cpu(sc->server_challenge);
	501	dout("handle_reply got server challenge %llx\n",
	502	xi->server_challenge);
	503	xi->starting = false;
	504	xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
	505	return -EAGAIN;
	506	}
	507
0cf5537b	508	op = le16_to_cpu(head->op);
ec0994e4 SW	509	result = le32_to_cpu(head->result);
	510	dout("handle_reply op %d result %d\n", op, result);
	511	switch (op) {
	512	case CEPHX_GET_AUTH_SESSION_KEY:
	513	/* verify auth key */
	514	ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
	515	buf + sizeof(*head), end);
	516	break;
	517
	518	case CEPHX_GET_PRINCIPAL_SESSION_KEY:
	519	th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
b545787d DC	520	if (IS_ERR(th))
b545787d DC	521	return PTR_ERR(th);
ec0994e4 SW	522	ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
	523	buf + sizeof(*head), end);
	524	break;
	525
	526	default:
	527	return -EINVAL;
	528	}
	529	if (ret)
	530	return ret;
	531	if (ac->want_keys == xi->have_keys)
	532	return 0;
	533	return -EAGAIN;
	534	}
	535
	536	static int ceph_x_create_authorizer(
	537	struct ceph_auth_client *ac, int peer_type,
74f1869f	538	struct ceph_auth_handshake *auth)
ec0994e4 SW	539	{
	540	struct ceph_x_authorizer *au;
	541	struct ceph_x_ticket_handler *th;
	542	int ret;
	543
	544	th = get_ticket_handler(ac, peer_type);
	545	if (IS_ERR(th))
	546	return PTR_ERR(th);
	547
	548	au = kzalloc(sizeof(*au), GFP_NOFS);
	549	if (!au)
	550	return -ENOMEM;
	551
	552	ret = ceph_x_build_authorizer(ac, th, au);
	553	if (ret) {
	554	kfree(au);
	555	return ret;
	556	}
	557
74f1869f AE	558	auth->authorizer = (struct ceph_authorizer *) au;
	559	auth->authorizer_buf = au->buf->vec.iov_base;
	560	auth->authorizer_buf_len = au->buf->vec.iov_len;
	561	auth->authorizer_reply_buf = au->reply_buf;
	562	auth->authorizer_reply_buf_len = sizeof (au->reply_buf);
	563
ec0994e4 SW	564	return 0;
	565	}
	566
0bed9b5c SW	567	static int ceph_x_update_authorizer(
	568	struct ceph_auth_client *ac, int peer_type,
	569	struct ceph_auth_handshake *auth)
	570	{
	571	struct ceph_x_authorizer *au;
	572	struct ceph_x_ticket_handler *th;
0bed9b5c SW	573
	574	th = get_ticket_handler(ac, peer_type);
	575	if (IS_ERR(th))
	576	return PTR_ERR(th);
	577
	578	au = (struct ceph_x_authorizer *)auth->authorizer;
	579	if (au->secret_id < th->secret_id) {
	580	dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
	581	au->service, au->secret_id, th->secret_id);
	582	return ceph_x_build_authorizer(ac, th, au);
	583	}
	584	return 0;
	585	}
	586
ec0994e4 SW	587	static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
	588	struct ceph_authorizer *a, size_t len)
	589	{
	590	struct ceph_x_authorizer au = (void )a;
	591	struct ceph_x_ticket_handler *th;
	592	int ret = 0;
	593	struct ceph_x_authorize_reply reply;
c27a3e4d	594	void *preply = &reply;
ec0994e4 SW	595	void *p = au->reply_buf;
	596	void *end = p + sizeof(au->reply_buf);
	597
	598	th = get_ticket_handler(ac, au->service);
b545787d DC	599	if (IS_ERR(th))
b545787d DC	600	return PTR_ERR(th);
c27a3e4d	601	ret = ceph_x_decrypt(&th->session_key, &p, end, &preply, sizeof(reply));
ec0994e4 SW	602	if (ret < 0)
	603	return ret;
	604	if (ret != sizeof(reply))
	605	return -EPERM;
	606
	607	if (au->nonce + 1 != le64_to_cpu(reply.nonce_plus_one))
	608	ret = -EPERM;
	609	else
	610	ret = 0;
	611	dout("verify_authorizer_reply nonce %llx got %llx ret %d\n",
	612	au->nonce, le64_to_cpu(reply.nonce_plus_one), ret);
	613	return ret;
	614	}
	615
	616	static void ceph_x_destroy_authorizer(struct ceph_auth_client *ac,
	617	struct ceph_authorizer *a)
	618	{
	619	struct ceph_x_authorizer au = (void )a;
	620
	621	ceph_buffer_put(au->buf);
	622	kfree(au);
	623	}
	624
	625
	626	static void ceph_x_reset(struct ceph_auth_client *ac)
	627	{
	628	struct ceph_x_info *xi = ac->private;
	629
	630	dout("reset\n");
	631	xi->starting = true;
	632	xi->server_challenge = 0;
	633	}
	634
	635	static void ceph_x_destroy(struct ceph_auth_client *ac)
	636	{
	637	struct ceph_x_info *xi = ac->private;
	638	struct rb_node *p;
	639
	640	dout("ceph_x_destroy %p\n", ac);
	641	ceph_crypto_key_destroy(&xi->secret);
	642
	643	while ((p = rb_first(&xi->ticket_handlers)) != NULL) {
	644	struct ceph_x_ticket_handler *th =
	645	rb_entry(p, struct ceph_x_ticket_handler, node);
	646	remove_ticket_handler(ac, th);
	647	}
	648
22b1de06 SW	649	if (xi->auth_authorizer.buf)
	650	ceph_buffer_put(xi->auth_authorizer.buf);
	651
ec0994e4 SW	652	kfree(ac->private);
	653	ac->private = NULL;
	654	}
	655
	656	static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
	657	int peer_type)
	658	{
	659	struct ceph_x_ticket_handler *th;
	660
	661	th = get_ticket_handler(ac, peer_type);
b545787d	662	if (!IS_ERR(th))
4b8e8b5d	663	memset(&th->validity, 0, sizeof(th->validity));
ec0994e4 SW	664	}
	665
	666
	667	static const struct ceph_auth_client_ops ceph_x_ops = {
559c1e00	668	.name = "x",
ec0994e4	669	.is_authenticated = ceph_x_is_authenticated,
a41359fa	670	.should_authenticate = ceph_x_should_authenticate,
ec0994e4 SW	671	.build_request = ceph_x_build_request,
	672	.handle_reply = ceph_x_handle_reply,
	673	.create_authorizer = ceph_x_create_authorizer,
0bed9b5c	674	.update_authorizer = ceph_x_update_authorizer,
ec0994e4 SW	675	.verify_authorizer_reply = ceph_x_verify_authorizer_reply,
	676	.destroy_authorizer = ceph_x_destroy_authorizer,
	677	.invalidate_authorizer = ceph_x_invalidate_authorizer,
	678	.reset = ceph_x_reset,
	679	.destroy = ceph_x_destroy,
	680	};
	681
	682
	683	int ceph_x_init(struct ceph_auth_client *ac)
	684	{
	685	struct ceph_x_info *xi;
	686	int ret;
	687
	688	dout("ceph_x_init %p\n", ac);
b0930f8d	689	ret = -ENOMEM;
ec0994e4 SW	690	xi = kzalloc(sizeof(*xi), GFP_NOFS);
ec0994e4 SW	691	if (!xi)
b0930f8d	692	goto out;
ec0994e4	693
ec0994e4	694	ret = -EINVAL;
8323c3aa	695	if (!ac->key) {
ec0994e4	696	pr_err("no secret set (for auth_x protocol)\n");
b0930f8d	697	goto out_nomem;
ec0994e4 SW	698	}
ec0994e4 SW	699
8323c3aa TV	700	ret = ceph_crypto_key_clone(&xi->secret, ac->key);
	701	if (ret < 0) {
	702	pr_err("cannot clone key: %d\n", ret);
b0930f8d	703	goto out_nomem;
8323c3aa	704	}
ec0994e4 SW	705
	706	xi->starting = true;
	707	xi->ticket_handlers = RB_ROOT;
	708
	709	ac->protocol = CEPH_AUTH_CEPHX;
	710	ac->private = xi;
	711	ac->ops = &ceph_x_ops;
	712	return 0;
	713
b0930f8d	714	out_nomem:
ec0994e4	715	kfree(xi);
b0930f8d	716	out:
ec0994e4 SW	717	return ret;
	718	}
	719
	720