669 lines
16 KiB
C
669 lines
16 KiB
C
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#include "ceph_debug.h"
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#include <linux/err.h>
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#include <linux/module.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include "auth_x.h"
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#include "auth_x_protocol.h"
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#include "crypto.h"
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#include "auth.h"
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#include "decode.h"
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#define TEMP_TICKET_BUF_LEN 256
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static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed);
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static int ceph_x_is_authenticated(struct ceph_auth_client *ac)
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{
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struct ceph_x_info *xi = ac->private;
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int need;
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ceph_x_validate_tickets(ac, &need);
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dout("ceph_x_is_authenticated want=%d need=%d have=%d\n",
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ac->want_keys, need, xi->have_keys);
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return (ac->want_keys & xi->have_keys) == ac->want_keys;
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}
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static int ceph_x_encrypt_buflen(int ilen)
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{
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return sizeof(struct ceph_x_encrypt_header) + ilen + 16 +
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sizeof(u32);
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}
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static int ceph_x_encrypt(struct ceph_crypto_key *secret,
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void *ibuf, int ilen, void *obuf, size_t olen)
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{
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struct ceph_x_encrypt_header head = {
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.struct_v = 1,
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.magic = cpu_to_le64(CEPHX_ENC_MAGIC)
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};
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size_t len = olen - sizeof(u32);
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int ret;
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ret = ceph_encrypt2(secret, obuf + sizeof(u32), &len,
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&head, sizeof(head), ibuf, ilen);
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if (ret)
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return ret;
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ceph_encode_32(&obuf, len);
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return len + sizeof(u32);
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}
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static int ceph_x_decrypt(struct ceph_crypto_key *secret,
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void **p, void *end, void *obuf, size_t olen)
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{
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struct ceph_x_encrypt_header head;
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size_t head_len = sizeof(head);
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int len, ret;
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len = ceph_decode_32(p);
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if (*p + len > end)
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return -EINVAL;
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dout("ceph_x_decrypt len %d\n", len);
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ret = ceph_decrypt2(secret, &head, &head_len, obuf, &olen,
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*p, len);
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if (ret)
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return ret;
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if (head.struct_v != 1 || le64_to_cpu(head.magic) != CEPHX_ENC_MAGIC)
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return -EPERM;
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*p += len;
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return olen;
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}
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/*
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* get existing (or insert new) ticket handler
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*/
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struct ceph_x_ticket_handler *get_ticket_handler(struct ceph_auth_client *ac,
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int service)
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{
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struct ceph_x_ticket_handler *th;
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struct ceph_x_info *xi = ac->private;
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struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node;
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while (*p) {
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parent = *p;
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th = rb_entry(parent, struct ceph_x_ticket_handler, node);
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if (service < th->service)
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p = &(*p)->rb_left;
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else if (service > th->service)
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p = &(*p)->rb_right;
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else
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return th;
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}
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/* add it */
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th = kzalloc(sizeof(*th), GFP_NOFS);
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if (!th)
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return ERR_PTR(-ENOMEM);
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th->service = service;
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rb_link_node(&th->node, parent, p);
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rb_insert_color(&th->node, &xi->ticket_handlers);
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return th;
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}
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static void remove_ticket_handler(struct ceph_auth_client *ac,
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struct ceph_x_ticket_handler *th)
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{
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struct ceph_x_info *xi = ac->private;
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dout("remove_ticket_handler %p %d\n", th, th->service);
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rb_erase(&th->node, &xi->ticket_handlers);
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ceph_crypto_key_destroy(&th->session_key);
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if (th->ticket_blob)
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ceph_buffer_put(th->ticket_blob);
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kfree(th);
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}
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static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac,
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struct ceph_crypto_key *secret,
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void *buf, void *end)
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{
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struct ceph_x_info *xi = ac->private;
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int num;
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void *p = buf;
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int ret;
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char *dbuf;
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char *ticket_buf;
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u8 struct_v;
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dbuf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
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if (!dbuf)
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return -ENOMEM;
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ret = -ENOMEM;
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ticket_buf = kmalloc(TEMP_TICKET_BUF_LEN, GFP_NOFS);
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if (!ticket_buf)
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goto out_dbuf;
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ceph_decode_need(&p, end, 1 + sizeof(u32), bad);
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struct_v = ceph_decode_8(&p);
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if (struct_v != 1)
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goto bad;
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num = ceph_decode_32(&p);
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dout("%d tickets\n", num);
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while (num--) {
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int type;
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u8 struct_v;
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struct ceph_x_ticket_handler *th;
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void *dp, *dend;
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int dlen;
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char is_enc;
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struct timespec validity;
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struct ceph_crypto_key old_key;
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void *tp, *tpend;
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struct ceph_timespec new_validity;
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struct ceph_crypto_key new_session_key;
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struct ceph_buffer *new_ticket_blob;
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unsigned long new_expires, new_renew_after;
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u64 new_secret_id;
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ceph_decode_need(&p, end, sizeof(u32) + 1, bad);
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type = ceph_decode_32(&p);
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dout(" ticket type %d %s\n", type, ceph_entity_type_name(type));
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struct_v = ceph_decode_8(&p);
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if (struct_v != 1)
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goto bad;
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th = get_ticket_handler(ac, type);
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if (IS_ERR(th)) {
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ret = PTR_ERR(th);
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goto out;
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}
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/* blob for me */
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dlen = ceph_x_decrypt(secret, &p, end, dbuf,
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TEMP_TICKET_BUF_LEN);
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if (dlen <= 0) {
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ret = dlen;
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goto out;
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}
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dout(" decrypted %d bytes\n", dlen);
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dend = dbuf + dlen;
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dp = dbuf;
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struct_v = ceph_decode_8(&dp);
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if (struct_v != 1)
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goto bad;
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memcpy(&old_key, &th->session_key, sizeof(old_key));
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ret = ceph_crypto_key_decode(&new_session_key, &dp, dend);
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if (ret)
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goto out;
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ceph_decode_copy(&dp, &new_validity, sizeof(new_validity));
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ceph_decode_timespec(&validity, &new_validity);
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new_expires = get_seconds() + validity.tv_sec;
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new_renew_after = new_expires - (validity.tv_sec / 4);
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dout(" expires=%lu renew_after=%lu\n", new_expires,
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new_renew_after);
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/* ticket blob for service */
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ceph_decode_8_safe(&p, end, is_enc, bad);
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tp = ticket_buf;
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if (is_enc) {
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/* encrypted */
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dout(" encrypted ticket\n");
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dlen = ceph_x_decrypt(&old_key, &p, end, ticket_buf,
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TEMP_TICKET_BUF_LEN);
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if (dlen < 0) {
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ret = dlen;
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goto out;
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}
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dlen = ceph_decode_32(&tp);
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} else {
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/* unencrypted */
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ceph_decode_32_safe(&p, end, dlen, bad);
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ceph_decode_need(&p, end, dlen, bad);
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ceph_decode_copy(&p, ticket_buf, dlen);
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}
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tpend = tp + dlen;
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dout(" ticket blob is %d bytes\n", dlen);
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ceph_decode_need(&tp, tpend, 1 + sizeof(u64), bad);
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struct_v = ceph_decode_8(&tp);
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new_secret_id = ceph_decode_64(&tp);
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ret = ceph_decode_buffer(&new_ticket_blob, &tp, tpend);
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if (ret)
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goto out;
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/* all is well, update our ticket */
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ceph_crypto_key_destroy(&th->session_key);
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if (th->ticket_blob)
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ceph_buffer_put(th->ticket_blob);
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th->session_key = new_session_key;
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th->ticket_blob = new_ticket_blob;
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th->validity = new_validity;
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th->secret_id = new_secret_id;
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th->expires = new_expires;
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th->renew_after = new_renew_after;
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dout(" got ticket service %d (%s) secret_id %lld len %d\n",
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type, ceph_entity_type_name(type), th->secret_id,
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(int)th->ticket_blob->vec.iov_len);
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xi->have_keys |= th->service;
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}
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ret = 0;
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out:
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kfree(ticket_buf);
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out_dbuf:
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kfree(dbuf);
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return ret;
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bad:
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ret = -EINVAL;
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goto out;
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}
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static int ceph_x_build_authorizer(struct ceph_auth_client *ac,
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struct ceph_x_ticket_handler *th,
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struct ceph_x_authorizer *au)
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{
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int maxlen;
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struct ceph_x_authorize_a *msg_a;
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struct ceph_x_authorize_b msg_b;
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void *p, *end;
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int ret;
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int ticket_blob_len =
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(th->ticket_blob ? th->ticket_blob->vec.iov_len : 0);
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dout("build_authorizer for %s %p\n",
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ceph_entity_type_name(th->service), au);
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maxlen = sizeof(*msg_a) + sizeof(msg_b) +
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ceph_x_encrypt_buflen(ticket_blob_len);
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dout(" need len %d\n", maxlen);
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if (au->buf && au->buf->alloc_len < maxlen) {
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ceph_buffer_put(au->buf);
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au->buf = NULL;
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}
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if (!au->buf) {
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au->buf = ceph_buffer_new(maxlen, GFP_NOFS);
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if (!au->buf)
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return -ENOMEM;
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}
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au->service = th->service;
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msg_a = au->buf->vec.iov_base;
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msg_a->struct_v = 1;
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msg_a->global_id = cpu_to_le64(ac->global_id);
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msg_a->service_id = cpu_to_le32(th->service);
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msg_a->ticket_blob.struct_v = 1;
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msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id);
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msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len);
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if (ticket_blob_len) {
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memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base,
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th->ticket_blob->vec.iov_len);
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}
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dout(" th %p secret_id %lld %lld\n", th, th->secret_id,
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le64_to_cpu(msg_a->ticket_blob.secret_id));
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p = msg_a + 1;
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p += ticket_blob_len;
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end = au->buf->vec.iov_base + au->buf->vec.iov_len;
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get_random_bytes(&au->nonce, sizeof(au->nonce));
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msg_b.struct_v = 1;
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msg_b.nonce = cpu_to_le64(au->nonce);
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ret = ceph_x_encrypt(&th->session_key, &msg_b, sizeof(msg_b),
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p, end - p);
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if (ret < 0)
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goto out_buf;
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p += ret;
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au->buf->vec.iov_len = p - au->buf->vec.iov_base;
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dout(" built authorizer nonce %llx len %d\n", au->nonce,
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(int)au->buf->vec.iov_len);
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BUG_ON(au->buf->vec.iov_len > maxlen);
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return 0;
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out_buf:
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ceph_buffer_put(au->buf);
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au->buf = NULL;
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return ret;
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}
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static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th,
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void **p, void *end)
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{
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ceph_decode_need(p, end, 1 + sizeof(u64), bad);
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ceph_encode_8(p, 1);
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ceph_encode_64(p, th->secret_id);
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if (th->ticket_blob) {
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const char *buf = th->ticket_blob->vec.iov_base;
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u32 len = th->ticket_blob->vec.iov_len;
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ceph_encode_32_safe(p, end, len, bad);
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ceph_encode_copy_safe(p, end, buf, len, bad);
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} else {
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ceph_encode_32_safe(p, end, 0, bad);
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}
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return 0;
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bad:
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return -ERANGE;
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}
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static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
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{
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int want = ac->want_keys;
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struct ceph_x_info *xi = ac->private;
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int service;
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*pneed = ac->want_keys & ~(xi->have_keys);
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for (service = 1; service <= want; service <<= 1) {
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struct ceph_x_ticket_handler *th;
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if (!(ac->want_keys & service))
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continue;
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if (*pneed & service)
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continue;
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th = get_ticket_handler(ac, service);
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if (!th) {
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*pneed |= service;
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continue;
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}
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if (get_seconds() >= th->renew_after)
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*pneed |= service;
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if (get_seconds() >= th->expires)
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xi->have_keys &= ~service;
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}
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}
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static int ceph_x_build_request(struct ceph_auth_client *ac,
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void *buf, void *end)
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{
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struct ceph_x_info *xi = ac->private;
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int need;
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struct ceph_x_request_header *head = buf;
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int ret;
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struct ceph_x_ticket_handler *th =
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get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
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ceph_x_validate_tickets(ac, &need);
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dout("build_request want %x have %x need %x\n",
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ac->want_keys, xi->have_keys, need);
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if (need & CEPH_ENTITY_TYPE_AUTH) {
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struct ceph_x_authenticate *auth = (void *)(head + 1);
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void *p = auth + 1;
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struct ceph_x_challenge_blob tmp;
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char tmp_enc[40];
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u64 *u;
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if (p > end)
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return -ERANGE;
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dout(" get_auth_session_key\n");
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head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
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/* encrypt and hash */
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get_random_bytes(&auth->client_challenge, sizeof(u64));
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tmp.client_challenge = auth->client_challenge;
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tmp.server_challenge = cpu_to_le64(xi->server_challenge);
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ret = ceph_x_encrypt(&xi->secret, &tmp, sizeof(tmp),
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tmp_enc, sizeof(tmp_enc));
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if (ret < 0)
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return ret;
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|
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auth->struct_v = 1;
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auth->key = 0;
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for (u = (u64 *)tmp_enc; u + 1 <= (u64 *)(tmp_enc + ret); u++)
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auth->key ^= *u;
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dout(" server_challenge %llx client_challenge %llx key %llx\n",
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xi->server_challenge, le64_to_cpu(auth->client_challenge),
|
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le64_to_cpu(auth->key));
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|
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/* now encode the old ticket if exists */
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ret = ceph_x_encode_ticket(th, &p, end);
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if (ret < 0)
|
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return ret;
|
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|
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return p - buf;
|
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}
|
|
|
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if (need) {
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void *p = head + 1;
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struct ceph_x_service_ticket_request *req;
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|
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if (p > end)
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return -ERANGE;
|
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head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
|
|
|
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BUG_ON(!th);
|
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ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
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if (ret)
|
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return ret;
|
|
ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
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xi->auth_authorizer.buf->vec.iov_len);
|
|
|
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req = p;
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req->keys = cpu_to_le32(need);
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p += sizeof(*req);
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return p - buf;
|
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}
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|
|
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return 0;
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}
|
|
|
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static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
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void *buf, void *end)
|
|
{
|
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struct ceph_x_info *xi = ac->private;
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struct ceph_x_reply_header *head = buf;
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struct ceph_x_ticket_handler *th;
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int len = end - buf;
|
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int op;
|
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int ret;
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|
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if (result)
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return result; /* XXX hmm? */
|
|
|
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if (xi->starting) {
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/* it's a hello */
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struct ceph_x_server_challenge *sc = buf;
|
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|
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if (len != sizeof(*sc))
|
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return -EINVAL;
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xi->server_challenge = le64_to_cpu(sc->server_challenge);
|
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dout("handle_reply got server challenge %llx\n",
|
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xi->server_challenge);
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xi->starting = false;
|
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xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
|
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return -EAGAIN;
|
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}
|
|
|
|
op = le32_to_cpu(head->op);
|
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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 */
|
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ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
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buf + sizeof(*head), end);
|
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break;
|
|
|
|
case CEPHX_GET_PRINCIPAL_SESSION_KEY:
|
|
th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
|
|
BUG_ON(!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_authorizer **a,
|
|
void **buf, size_t *len,
|
|
void **reply_buf, size_t *reply_len)
|
|
{
|
|
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;
|
|
}
|
|
|
|
*a = (struct ceph_authorizer *)au;
|
|
*buf = au->buf->vec.iov_base;
|
|
*len = au->buf->vec.iov_len;
|
|
*reply_buf = au->reply_buf;
|
|
*reply_len = sizeof(au->reply_buf);
|
|
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 *p = au->reply_buf;
|
|
void *end = p + sizeof(au->reply_buf);
|
|
|
|
th = get_ticket_handler(ac, au->service);
|
|
if (!th)
|
|
return -EIO; /* hrm! */
|
|
ret = ceph_x_decrypt(&th->session_key, &p, end, &reply, 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);
|
|
}
|
|
|
|
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 (th && !IS_ERR(th))
|
|
remove_ticket_handler(ac, th);
|
|
}
|
|
|
|
|
|
static const struct ceph_auth_client_ops ceph_x_ops = {
|
|
.is_authenticated = ceph_x_is_authenticated,
|
|
.build_request = ceph_x_build_request,
|
|
.handle_reply = ceph_x_handle_reply,
|
|
.create_authorizer = ceph_x_create_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->secret) {
|
|
pr_err("no secret set (for auth_x protocol)\n");
|
|
goto out_nomem;
|
|
}
|
|
|
|
ret = ceph_crypto_key_unarmor(&xi->secret, ac->secret);
|
|
if (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;
|
|
}
|
|
|
|
|