// SPDX-License-Identifier: GPL-2.0
#include <linux/ceph/ceph_debug.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/ceph/types.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/libceph.h>
#include <linux/ceph/messenger.h>
#include "auth_none.h"
#include "auth_x.h"
/*
* get protocol handler
*/
static u32 supported_protocols[] = {
CEPH_AUTH_NONE,
CEPH_AUTH_CEPHX
};
static int init_protocol(struct ceph_auth_client *ac, int proto)
{
dout("%s proto %d\n", __func__, proto);
switch (proto) {
case CEPH_AUTH_NONE:
return ceph_auth_none_init(ac);
case CEPH_AUTH_CEPHX:
return ceph_x_init(ac);
default:
pr_err("bad auth protocol %d\n", proto);
return -EINVAL;
}
}
void ceph_auth_set_global_id(struct ceph_auth_client *ac, u64 global_id)
{
dout("%s global_id %llu\n", __func__, global_id);
if (!global_id)
pr_err("got zero global_id\n");
if (ac->global_id && global_id != ac->global_id)
pr_err("global_id changed from %llu to %llu\n", ac->global_id,
global_id);
ac->global_id = global_id;
}
/*
* setup, teardown.
*/
struct ceph_auth_client *ceph_auth_init(const char *name,
const struct ceph_crypto_key *key,
const int *con_modes)
{
struct ceph_auth_client *ac;
ac = kzalloc(sizeof(*ac), GFP_NOFS);
if (!ac)
return ERR_PTR(-ENOMEM);
mutex_init(&ac->mutex);
ac->negotiating = true;
if (name)
ac->name = name;
else
ac->name = CEPH_AUTH_NAME_DEFAULT;
ac->key = key;
ac->preferred_mode = con_modes[0];
ac->fallback_mode = con_modes[1];
dout("%s name '%s' preferred_mode %d fallback_mode %d\n", __func__,
ac->name, ac->preferred_mode, ac->fallback_mode);
return ac;
}
void ceph_auth_destroy(struct ceph_auth_client *ac)
{
dout("auth_destroy %p\n", ac);
if (ac->ops)
ac->ops->destroy(ac);
kfree(ac);
}
/*
* Reset occurs when reconnecting to the monitor.
*/
void ceph_auth_reset(struct ceph_auth_client *ac)
{
mutex_lock(&ac->mutex);
dout("auth_reset %p\n", ac);
if (ac->ops && !ac->negotiating)
ac->ops->reset(ac);
ac->negotiating = true;
mutex_unlock(&ac->mutex);
}
/*
* EntityName, not to be confused with entity_name_t
*/
int ceph_auth_entity_name_encode(const char *name, void **p, void *end)
{
int len = strlen(name);
if (*p + 2*sizeof(u32) + len > end)
return -ERANGE;
ceph_encode_32(p, CEPH_ENTITY_TYPE_CLIENT);
ceph_encode_32(p, len);
ceph_encode_copy(p, name, len);
return 0;
}
/*
* Initiate protocol negotiation with monitor. Include entity name
* and list supported protocols.
*/
int ceph_auth_build_hello(struct ceph_auth_client *ac, void *buf, size_t len)
{
struct ceph_mon_request_header *monhdr = buf;
void *p = monhdr + 1, *end = buf + len, *lenp;
int i, num;
int ret;
mutex_lock(&ac->mutex);
dout("auth_build_hello\n");
monhdr->have_version = 0;
monhdr->session_mon = cpu_to_le16(-1);
monhdr->session_mon_tid = 0;
ceph_encode_32(&p, CEPH_AUTH_UNKNOWN); /* no protocol, yet */
lenp = p;
p += sizeof(u32);
ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
ceph_encode_8(&p, 1);
num = ARRAY_SIZE(supported_protocols);
ceph_encode_32(&p, num);
ceph_decode_need(&p, end, num * sizeof(u32), bad);
for (i = 0; i < num; i++)
ceph_encode_32(&p, supported_protocols[i]);
ret = ceph_auth_entity_name_encode(ac->name, &p, end);
if (ret < 0)
goto out;
ceph_decode_need(&p, end, sizeof(u64), bad);
ceph_encode_64(&p, ac->global_id);
ceph_encode_32(&lenp, p - lenp - sizeof(u32));
ret = p - buf;
out:
mutex_unlock(&ac->mutex);
return ret;
bad:
ret = -ERANGE;
goto out;
}
static int build_request(struct ceph_auth_client *ac, bool add_header,
void *buf, int buf_len)
{
void *end = buf + buf_len;
void *p;
int ret;
p = buf;
if (add_header) {
/* struct ceph_mon_request_header + protocol */
ceph_encode_64_safe(&p, end, 0, e_range);
ceph_encode_16_safe(&p, end, -1, e_range);
ceph_encode_64_safe(&p, end, 0, e_range);
ceph_encode_32_safe(&p, end, ac->protocol, e_range);
}
ceph_encode_need(&p, end, sizeof(u32), e_range);
ret = ac->ops->build_request(ac, p + sizeof(u32), end);
if (ret < 0) {
pr_err("auth protocol '%s' building request failed: %d\n",
ceph_auth_proto_name(ac->protocol), ret);
return ret;
}
dout(" built request %d bytes\n", ret);
ceph_encode_32(&p, ret);
return p + ret - buf;
e_range:
return -ERANGE;
}
/*
* Handle auth message from monitor.
*/
int ceph_handle_auth_reply(struct ceph_auth_client *ac,
void *buf, size_t len,
void *reply_buf, size_t reply_len)
{
void *p = buf;
void *end = buf + len;
int protocol;
s32 result;
u64 global_id;
void *payload, *payload_end;
int payload_len;
char *result_msg;
int result_msg_len;
int ret = -EINVAL;
mutex_lock(&ac->mutex);
dout("handle_auth_reply %p %p\n", p, end);
ceph_decode_need(&p, end, sizeof(u32) * 3 + sizeof(u64), bad);
protocol = ceph_decode_32(&p);
result = ceph_decode_32(&p);
global_id = ceph_decode_64(&p);
payload_len = ceph_decode_32(&p);
payload = p;
p += payload_len;
ceph_decode_need(&p, end, sizeof(u32), bad);
result_msg_len = ceph_decode_32(&p);
result_msg = p;
p += result_msg_len;
if (p != end)
goto bad;
dout(" result %d '%.*s' gid %llu len %d\n", result, result_msg_len,
result_msg, global_id, payload_len);
payload_end = payload + payload_len;
if (ac->negotiating) {
/* server does not support our protocols? */
if (!protocol && result < 0) {
ret = result;
goto out;
}
/* set up (new) protocol handler? */
if (ac->protocol && ac->protocol != protocol) {
ac->ops->destroy(ac);
ac->protocol = 0;
ac->ops = NULL;
}
if (ac->protocol != protocol) {
ret = init_protocol(ac, protocol);
if (ret) {
pr_err("auth protocol '%s' init failed: %d\n",
ceph_auth_proto_name(protocol), ret);
goto out;
}
}
ac->negotiating = false;
}
if (result) {
pr_err("auth protocol '%s' mauth authentication failed: %d\n",
ceph_auth_proto_name(ac->protocol), result);
ret = result;
goto out;
}
ret = ac->ops->handle_reply(ac, global_id, payload, payload_end,
NULL, NULL, NULL, NULL);
if (ret == -EAGAIN) {
ret = build_request(ac, true, reply_buf, reply_len);
goto out;
} else if (ret) {
goto out;
}
out:
mutex_unlock(&ac->mutex);
return ret;
bad:
pr_err("failed to decode auth msg\n");
ret = -EINVAL;
goto out;
}
int ceph_build_auth(struct ceph_auth_client *ac,
void *msg_buf, size_t msg_len)
{
int ret = 0;
mutex_lock(&ac->mutex);
if (ac->ops->should_authenticate(ac))
ret = build_request(ac, true, msg_buf, msg_len);
mutex_unlock(&ac->mutex);
return ret;
}
int ceph_auth_is_authenticated(struct ceph_auth_client *ac)
{
int ret = 0;
mutex_lock(&ac->mutex);
if (ac->ops)
ret = ac->ops->is_authenticated(ac);
mutex_unlock(&ac->mutex);
return ret;
}
EXPORT_SYMBOL(ceph_auth_is_authenticated);
int __ceph_auth_get_authorizer(struct ceph_auth_client *ac,
struct ceph_auth_handshake *auth,
int peer_type, bool force_new,
int *proto, int *pref_mode, int *fallb_mode)
{
int ret;
mutex_lock(&ac->mutex);
if (force_new && auth->authorizer) {
ceph_auth_destroy_authorizer(auth->authorizer);
auth->authorizer = NULL;
}
if (!auth->authorizer)
ret = ac->ops->create_authorizer(ac, peer_type, auth);
else if (ac->ops->update_authorizer)
ret = ac->ops->update_authorizer(ac, peer_type, auth);
else
ret = 0;
if (ret)
goto out;
*proto = ac->protocol;
if (pref_mode && fallb_mode) {
*pref_mode = ac->preferred_mode;
*fallb_mode = ac->fallback_mode;
}
out:
mutex_unlock(&ac->mutex);
return ret;
}
EXPORT_SYMBOL(__ceph_auth_get_authorizer);
void ceph_auth_destroy_authorizer(struct ceph_authorizer *a)
{
a->destroy(a);
}
EXPORT_SYMBOL(ceph_auth_destroy_authorizer);
int ceph_auth_add_authorizer_challenge(struct ceph_auth_client *ac,
struct ceph_authorizer *a,
void *challenge_buf,
int challenge_buf_len)
{
int ret = 0;
mutex_lock(&ac->mutex);
if (ac->ops && ac->ops->add_authorizer_challenge)
ret = ac->ops->add_authorizer_challenge(ac, a, challenge_buf,
challenge_buf_len);
mutex_unlock(&ac->mutex);
return ret;
}
EXPORT_SYMBOL(ceph_auth_add_authorizer_challenge);
int ceph_auth_verify_authorizer_reply(struct ceph_auth_client *ac,
struct ceph_authorizer *a,
void *reply, int reply_len,
u8 *session_key, int *session_key_len,
u8 *con_secret, int *con_secret_len)
{
int ret = 0;
mutex_lock(&ac->mutex);
if (ac->ops && ac->ops->verify_authorizer_reply)
ret = ac->ops->verify_authorizer_reply(ac, a,
reply, reply_len, session_key, session_key_len,
con_secret, con_secret_len);
mutex_unlock(&ac->mutex);
return ret;
}
EXPORT_SYMBOL(ceph_auth_verify_authorizer_reply);
void ceph_auth_invalidate_authorizer(struct ceph_auth_client *ac, int peer_type)
{
mutex_lock(&ac->mutex);
if (ac->ops && ac->ops->invalidate_authorizer)
ac->ops->invalidate_authorizer(ac, peer_type);
mutex_unlock(&ac->mutex);
}
EXPORT_SYMBOL(ceph_auth_invalidate_authorizer);
/*
* msgr2 authentication
*/
static bool contains(const int *arr, int cnt, int val)
{
int i;
for (i = 0; i < cnt; i++) {
if (arr[i] == val)
return true;
}
return false;
}
static int encode_con_modes(void **p, void *end, int pref_mode, int fallb_mode)
{
WARN_ON(pref_mode == CEPH_CON_MODE_UNKNOWN);
if (fallb_mode != CEPH_CON_MODE_UNKNOWN) {
ceph_encode_32_safe(p, end, 2, e_range);
ceph_encode_32_safe(p, end, pref_mode, e_range);
ceph_encode_32_safe(p, end, fallb_mode, e_range);
} else {
ceph_encode_32_safe(p, end, 1, e_range);
ceph_encode_32_safe(p, end, pref_mode, e_range);
}
return 0;
e_range:
return -ERANGE;
}
/*
* Similar to ceph_auth_build_hello().
*/
int ceph_auth_get_request(struct ceph_auth_client *ac, void *buf, int buf_len)
{
int proto = ac->key ? CEPH_AUTH_CEPHX : CEPH_AUTH_NONE;
void *end = buf + buf_len;
void *lenp;
void *p;
int ret;
mutex_lock(&ac->mutex);
if (ac->protocol == CEPH_AUTH_UNKNOWN) {
ret = init_protocol(ac, proto);
if (ret) {
pr_err("auth protocol '%s' init failed: %d\n",
ceph_auth_proto_name(proto), ret);
goto out;
}
} else {
WARN_ON(ac->protocol != proto);
ac->ops->reset(ac);
}
p = buf;
ceph_encode_32_safe(&p, end, ac->protocol, e_range);
ret = encode_con_modes(&p, end, ac->preferred_mode, ac->fallback_mode);
if (ret)
goto out;
lenp = p;
p += 4; /* space for len */
ceph_encode_8_safe(&p, end, CEPH_AUTH_MODE_MON, e_range);
ret = ceph_auth_entity_name_encode(ac->name, &p, end);
if (ret)
goto out;
ceph_encode_64_safe(&p, end, ac->global_id, e_range);
ceph_encode_32(&lenp, p - lenp - 4);
ret = p - buf;
out:
mutex_unlock(&ac->mutex);
return ret;
e_range:
ret = -ERANGE;
goto out;
}
int ceph_auth_handle_reply_more(struct ceph_auth_client *ac, void *reply,
int reply_len, void *buf, int buf_len)
{
int ret;
mutex_lock(&ac->mutex);
ret = ac->ops->handle_reply(ac, 0, reply, reply + reply_len,
NULL, NULL, NULL, NULL);
if (ret == -EAGAIN)
ret = build_request(ac, false, buf, buf_len);
else
WARN_ON(ret >= 0);
mutex_unlock(&ac->mutex);
return ret;
}
int ceph_auth_handle_reply_done(struct ceph_auth_client *ac,
u64 global_id, void *reply, int reply_len,
u8 *session_key, int *session_key_len,
u8 *con_secret, int *con_secret_len)
{
int ret;
mutex_lock(&ac->mutex);
ret = ac->ops->handle_reply(ac, global_id, reply, reply + reply_len,
session_key, session_key_len,
con_secret, con_secret_len);
WARN_ON(ret == -EAGAIN || ret > 0);
mutex_unlock(&ac->mutex);
return ret;
}
bool ceph_auth_handle_bad_method(struct ceph_auth_client *ac,
int used_proto, int result,
const int *allowed_protos, int proto_cnt,
const int *allowed_modes, int mode_cnt)
{
mutex_lock(&ac->mutex);
WARN_ON(used_proto != ac->protocol);
if (result == -EOPNOTSUPP) {
if (!contains(allowed_protos, proto_cnt, ac->protocol)) {
pr_err("auth protocol '%s' not allowed\n",
ceph_auth_proto_name(ac->protocol));
goto not_allowed;
}
if (!contains(allowed_modes, mode_cnt, ac->preferred_mode) &&
(ac->fallback_mode == CEPH_CON_MODE_UNKNOWN ||
!contains(allowed_modes, mode_cnt, ac->fallback_mode))) {
pr_err("preferred mode '%s' not allowed\n",
ceph_con_mode_name(ac->preferred_mode));
if (ac->fallback_mode == CEPH_CON_MODE_UNKNOWN)
pr_err("no fallback mode\n");
else
pr_err("fallback mode '%s' not allowed\n",
ceph_con_mode_name(ac->fallback_mode));
goto not_allowed;
}
}
WARN_ON(result == -EOPNOTSUPP || result >= 0);
pr_err("auth protocol '%s' msgr authentication failed: %d\n",
ceph_auth_proto_name(ac->protocol), result);
mutex_unlock(&ac->mutex);
return true;
not_allowed:
mutex_unlock(&ac->mutex);
return false;
}
int ceph_auth_get_authorizer(struct ceph_auth_client *ac,
struct ceph_auth_handshake *auth,
int peer_type, void *buf, int *buf_len)
{
void *end = buf + *buf_len;
int pref_mode, fallb_mode;
int proto;
void *p;
int ret;
ret = __ceph_auth_get_authorizer(ac, auth, peer_type, true, &proto,
&pref_mode, &fallb_mode);
if (ret)
return ret;
p = buf;
ceph_encode_32_safe(&p, end, proto, e_range);
ret = encode_con_modes(&p, end, pref_mode, fallb_mode);
if (ret)
return ret;
ceph_encode_32_safe(&p, end, auth->authorizer_buf_len, e_range);
*buf_len = p - buf;
return 0;
e_range:
return -ERANGE;
}
EXPORT_SYMBOL(ceph_auth_get_authorizer);
int ceph_auth_handle_svc_reply_more(struct ceph_auth_client *ac,
struct ceph_auth_handshake *auth,
void *reply, int reply_len,
void *buf, int *buf_len)
{
void *end = buf + *buf_len;
void *p;
int ret;
ret = ceph_auth_add_authorizer_challenge(ac, auth->authorizer,
reply, reply_len);
if (ret)
return ret;
p = buf;
ceph_encode_32_safe(&p, end, auth->authorizer_buf_len, e_range);
*buf_len = p - buf;
return 0;
e_range:
return -ERANGE;
}
EXPORT_SYMBOL(ceph_auth_handle_svc_reply_more);
int ceph_auth_handle_svc_reply_done(struct ceph_auth_client *ac,
struct ceph_auth_handshake *auth,
void *reply, int reply_len,
u8 *session_key, int *session_key_len,
u8 *con_secret, int *con_secret_len)
{
return ceph_auth_verify_authorizer_reply(ac, auth->authorizer,
reply, reply_len, session_key, session_key_len,
con_secret, con_secret_len);
}
EXPORT_SYMBOL(ceph_auth_handle_svc_reply_done);
bool ceph_auth_handle_bad_authorizer(struct ceph_auth_client *ac,
int peer_type, int used_proto, int result,
const int *allowed_protos, int proto_cnt,
const int *allowed_modes, int mode_cnt)
{
mutex_lock(&ac->mutex);
WARN_ON(used_proto != ac->protocol);
if (result == -EOPNOTSUPP) {
if (!contains(allowed_protos, proto_cnt, ac->protocol)) {
pr_err("auth protocol '%s' not allowed by %s\n",
ceph_auth_proto_name(ac->protocol),
ceph_entity_type_name(peer_type));
goto not_allowed;
}
if (!contains(allowed_modes, mode_cnt, ac->preferred_mode) &&
(ac->fallback_mode == CEPH_CON_MODE_UNKNOWN ||
!contains(allowed_modes, mode_cnt, ac->fallback_mode))) {
pr_err("preferred mode '%s' not allowed by %s\n",
ceph_con_mode_name(ac->preferred_mode),
ceph_entity_type_name(peer_type));
if (ac->fallback_mode == CEPH_CON_MODE_UNKNOWN)
pr_err("no fallback mode\n");
else
pr_err("fallback mode '%s' not allowed by %s\n",
ceph_con_mode_name(ac->fallback_mode),
ceph_entity_type_name(peer_type));
goto not_allowed;
}
}
WARN_ON(result == -EOPNOTSUPP || result >= 0);
pr_err("auth protocol '%s' authorization to %s failed: %d\n",
ceph_auth_proto_name(ac->protocol),
ceph_entity_type_name(peer_type), result);
if (ac->ops->invalidate_authorizer)
ac->ops->invalidate_authorizer(ac, peer_type);
mutex_unlock(&ac->mutex);
return true;
not_allowed:
mutex_unlock(&ac->mutex);
return false;
}
EXPORT_SYMBOL(ceph_auth_handle_bad_authorizer);
Codebase Browser
linux