Release 4.11 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 <linux/ceph/libceph.h>
#include <linux/ceph/messenger.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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
61
100.00%
1
100.00%
Total
61
100.00%
1
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
51
100.00%
1
100.00%
Total
51
100.00%
1
100.00%



static int ceph_x_encrypt_offset(void)
{
	return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
11
55.00%
1
50.00%
Ilya Dryomov
9
45.00%
1
50.00%
Total
20
100.00%
2
100.00%



static int ceph_x_encrypt_buflen(int ilen)
{
	return ceph_x_encrypt_offset() + ilen + 16;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
11
64.71%
1
50.00%
Sage Weil
6
35.29%
1
50.00%
Total
17
100.00%
2
100.00%



static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
			  int buf_len, int plaintext_len)
{
	struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
	int ciphertext_len;
	int ret;

	hdr->struct_v = 1;
	hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);

	ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
			 plaintext_len + sizeof(struct ceph_x_encrypt_header),
			 &ciphertext_len);
	if (ret)
		return ret;

	ceph_encode_32(&buf, ciphertext_len);
	return sizeof(u32) + ciphertext_len;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
65
58.56%
1
50.00%
Ilya Dryomov
46
41.44%
1
50.00%
Total
111
100.00%
2
100.00%



static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
{
	struct ceph_x_encrypt_header *hdr = *p + sizeof(u32);
	int ciphertext_len, plaintext_len;
	int ret;

	ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
	ceph_decode_need(p, end, ciphertext_len, e_inval);

	ret = ceph_crypt(secret, false, *p, end - *p, ciphertext_len,
			 &plaintext_len);
	if (ret)
		return ret;

	if (hdr->struct_v != 1 || le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC)
		return -EPERM;

	*p += ciphertext_len;
	return plaintext_len - sizeof(struct ceph_x_encrypt_header);

e_inval:
	return -EINVAL;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
79
59.40%
1
33.33%
Ilya Dryomov
54
40.60%
2
66.67%
Total
133
100.00%
3
100.00%

/*
 * 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
172
99.42%
1
50.00%
Yehuda Sadeh Weinraub
1
0.58%
1
50.00%
Total
173
100.00%
2
100.00%



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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
75
100.00%
1
100.00%
Total
75
100.00%
1
100.00%



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 *dp, *dend;
	int dlen;
	char is_enc;
	struct timespec validity;
	void *tp, *tpend;
	void **ptp;
	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 */
	dp = *p + ceph_x_encrypt_offset();
	ret = ceph_x_decrypt(secret, p, end);
	if (ret < 0)
		goto out;
	dout(" decrypted %d bytes\n", ret);
	dend = dp + ret;

	tkt_struct_v = ceph_decode_8(&dp);
	if (tkt_struct_v != 1)
		goto bad;

	ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
	if (ret)
		goto out;

	ceph_decode_timespec(&validity, dp);
	dp += sizeof(struct ceph_timespec);
	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 */
		tp = *p + ceph_x_encrypt_offset();
		ret = ceph_x_decrypt(&th->session_key, p, end);
		if (ret < 0)
			goto out;
		dout(" encrypted ticket, decrypted %d bytes\n", ret);
		ptp = &tp;
		tpend = tp + ret;
	} 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->secret_id = new_secret_id;
	th->expires = new_expires;
	th->renew_after = new_renew_after;
	th->have_key = true;
	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
457
82.19%
4
36.36%
Ilya Dryomov
99
17.81%
7
63.64%
Total
556
100.00%
11
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
109
93.16%
2
66.67%
Sage Weil
8
6.84%
1
33.33%
Total
117
100.00%
3
100.00%



static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
{
	ceph_crypto_key_destroy(&au->session_key);
	if (au->buf) {
		ceph_buffer_put(au->buf);
		au->buf = NULL;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
40
100.00%
1
100.00%
Total
40
100.00%
1
100.00%



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);

	ceph_crypto_key_destroy(&au->session_key);
	ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
	if (ret)
		goto out_au;

	maxlen = sizeof(*msg_a) + ticket_blob_len +
		ceph_x_encrypt_buflen(sizeof(*msg_b));
	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) {
			ret = -ENOMEM;
			goto out_au;
		}
	}
	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;

	msg_b = p + ceph_x_encrypt_offset();
	msg_b->struct_v = 1;
	get_random_bytes(&au->nonce, sizeof(au->nonce));
	msg_b->nonce = cpu_to_le64(au->nonce);
	ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
	if (ret < 0)
		goto out_au;

	p += ret;
	WARN_ON(p > end);
	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);
	return 0;

out_au:
	ceph_x_authorizer_cleanup(au);
	return ret;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
421
84.88%
3
42.86%
Ilya Dryomov
45
9.07%
3
42.86%
Yan, Zheng
30
6.05%
1
14.29%
Total
496
100.00%
7
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
131
100.00%
1
100.00%
Total
131
100.00%
1
100.00%



static bool need_key(struct ceph_x_ticket_handler *th)
{
	if (!th->have_key)
		return true;

	return get_seconds() >= th->renew_after;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
29
100.00%
1
100.00%
Total
29
100.00%
1
100.00%



static bool have_key(struct ceph_x_ticket_handler *th)
{
	if (th->have_key) {
		if (get_seconds() >= th->expires)
			th->have_key = false;
	}

	return th->have_key;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
39
100.00%
1
100.00%
Total
39
100.00%
1
100.00%



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 (need_key(th))
			*pneed |= service;
		if (!have_key(th))
			xi->have_keys &= ~service;
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
130
92.86%
1
33.33%
Ilya Dryomov
7
5.00%
1
33.33%
Dan Carpenter
3
2.14%
1
33.33%
Total
140
100.00%
3
100.00%



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;
		void *enc_buf = xi->auth_authorizer.enc_buf;
		struct ceph_x_challenge_blob *blob = enc_buf +
							ceph_x_encrypt_offset();
		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));
		blob->client_challenge = auth->client_challenge;
		blob->server_challenge = cpu_to_le64(xi->server_challenge);
		ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
				     sizeof(*blob));
		if (ret < 0)
			return ret;

		auth->struct_v = 1;
		auth->key = 0;
		for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
400
90.09%
1
25.00%
Ilya Dryomov
27
6.08%
1
25.00%
Dan Carpenter
13
2.93%
1
25.00%
Yehuda Sadeh Weinraub
4
0.90%
1
25.00%
Total
444
100.00%
4
100.00%



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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Sage Weil
257
95.90%
1
33.33%
Dan Carpenter
10
3.73%
1
33.33%
Yehuda Sadeh Weinraub
1
0.37%
1
33.33%
Total
268
100.00%
3
100.00%



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

	ceph_x_authorizer_cleanup(au);
	kfree(au);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Ilya Dryomov
32
100.00%
1
100.00%
Total
32
100.00%
1
100.00%



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