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