965 lines
23 KiB
C
965 lines
23 KiB
C
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#include <linux/ceph/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 <linux/ceph/decode.h>
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#include <linux/ceph/auth.h>
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#include <linux/ceph/ceph_features.h>
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#include <linux/ceph/libceph.h>
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#include <linux/ceph/messenger.h>
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#include "crypto.h"
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#include "auth_x.h"
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#include "auth_x_protocol.h"
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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_should_authenticate(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_should_authenticate want=%d need=%d have=%d\n",
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ac->want_keys, need, xi->have_keys);
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return need != 0;
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}
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static int ceph_x_encrypt_offset(void)
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{
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return sizeof(u32) + sizeof(struct ceph_x_encrypt_header);
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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 ceph_x_encrypt_offset() + ilen + 16;
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}
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static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf,
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int buf_len, int plaintext_len)
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{
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struct ceph_x_encrypt_header *hdr = buf + sizeof(u32);
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int ciphertext_len;
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int ret;
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hdr->struct_v = 1;
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hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC);
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ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32),
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plaintext_len + sizeof(struct ceph_x_encrypt_header),
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&ciphertext_len);
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if (ret)
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return ret;
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ceph_encode_32(&buf, ciphertext_len);
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return sizeof(u32) + ciphertext_len;
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}
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static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p,
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int ciphertext_len)
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{
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struct ceph_x_encrypt_header *hdr = p;
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int plaintext_len;
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int ret;
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ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len,
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&plaintext_len);
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if (ret)
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return ret;
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if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) {
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pr_err("%s bad magic\n", __func__);
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return -EINVAL;
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}
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return plaintext_len - sizeof(*hdr);
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}
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static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end)
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{
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int ciphertext_len;
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int ret;
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ceph_decode_32_safe(p, end, ciphertext_len, e_inval);
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ceph_decode_need(p, end, ciphertext_len, e_inval);
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ret = __ceph_x_decrypt(secret, *p, ciphertext_len);
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if (ret < 0)
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return ret;
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*p += ciphertext_len;
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return ret;
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e_inval:
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return -EINVAL;
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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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static struct ceph_x_ticket_handler *
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get_ticket_handler(struct ceph_auth_client *ac, 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 process_one_ticket(struct ceph_auth_client *ac,
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struct ceph_crypto_key *secret,
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void **p, void *end)
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{
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struct ceph_x_info *xi = ac->private;
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int type;
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u8 tkt_struct_v, blob_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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void *tp, *tpend;
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void **ptp;
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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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int ret;
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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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tkt_struct_v = ceph_decode_8(p);
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if (tkt_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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dp = *p + ceph_x_encrypt_offset();
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ret = ceph_x_decrypt(secret, p, end);
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if (ret < 0)
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goto out;
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dout(" decrypted %d bytes\n", ret);
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dend = dp + ret;
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tkt_struct_v = ceph_decode_8(&dp);
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if (tkt_struct_v != 1)
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goto bad;
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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_timespec(&validity, dp);
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dp += sizeof(struct ceph_timespec);
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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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if (is_enc) {
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/* encrypted */
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tp = *p + ceph_x_encrypt_offset();
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ret = ceph_x_decrypt(&th->session_key, p, end);
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if (ret < 0)
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goto out;
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dout(" encrypted ticket, decrypted %d bytes\n", ret);
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ptp = &tp;
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tpend = tp + ret;
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} else {
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/* unencrypted */
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ptp = p;
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tpend = end;
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}
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ceph_decode_32_safe(ptp, tpend, dlen, bad);
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dout(" ticket blob is %d bytes\n", dlen);
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ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad);
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blob_struct_v = ceph_decode_8(ptp);
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new_secret_id = ceph_decode_64(ptp);
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ret = ceph_decode_buffer(&new_ticket_blob, ptp, 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->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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th->have_key = true;
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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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out:
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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_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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void *p = buf;
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u8 reply_struct_v;
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u32 num;
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int ret;
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ceph_decode_8_safe(&p, end, reply_struct_v, bad);
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if (reply_struct_v != 1)
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return -EINVAL;
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ceph_decode_32_safe(&p, end, num, bad);
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dout("%d tickets\n", num);
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while (num--) {
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ret = process_one_ticket(ac, secret, &p, end);
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if (ret)
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return ret;
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}
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return 0;
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bad:
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return -EINVAL;
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}
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/*
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* Encode and encrypt the second part (ceph_x_authorize_b) of the
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* authorizer. The first part (ceph_x_authorize_a) should already be
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* encoded.
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*/
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static int encrypt_authorizer(struct ceph_x_authorizer *au,
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u64 *server_challenge)
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{
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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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msg_a = au->buf->vec.iov_base;
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WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id));
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p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len);
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end = au->buf->vec.iov_base + au->buf->vec.iov_len;
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msg_b = p + ceph_x_encrypt_offset();
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msg_b->struct_v = 2;
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msg_b->nonce = cpu_to_le64(au->nonce);
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if (server_challenge) {
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msg_b->have_challenge = 1;
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msg_b->server_challenge_plus_one =
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cpu_to_le64(*server_challenge + 1);
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} else {
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msg_b->have_challenge = 0;
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msg_b->server_challenge_plus_one = 0;
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}
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ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b));
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if (ret < 0)
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return ret;
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p += ret;
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if (server_challenge) {
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WARN_ON(p != end);
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} else {
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WARN_ON(p > end);
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au->buf->vec.iov_len = p - au->buf->vec.iov_base;
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}
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return 0;
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}
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static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au)
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{
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ceph_crypto_key_destroy(&au->session_key);
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if (au->buf) {
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ceph_buffer_put(au->buf);
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au->buf = NULL;
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}
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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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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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ceph_crypto_key_destroy(&au->session_key);
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ret = ceph_crypto_key_clone(&au->session_key, &th->session_key);
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if (ret)
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goto out_au;
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maxlen = sizeof(*msg_a) + ticket_blob_len +
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ceph_x_encrypt_buflen(sizeof(*msg_b));
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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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ret = -ENOMEM;
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goto out_au;
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}
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}
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au->service = th->service;
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au->secret_id = th->secret_id;
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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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get_random_bytes(&au->nonce, sizeof(au->nonce));
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ret = encrypt_authorizer(au, NULL);
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if (ret) {
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pr_err("failed to encrypt authorizer: %d", ret);
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goto out_au;
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}
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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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return 0;
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out_au:
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ceph_x_authorizer_cleanup(au);
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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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|
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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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|
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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 bool need_key(struct ceph_x_ticket_handler *th)
|
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{
|
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if (!th->have_key)
|
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return true;
|
|
|
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return get_seconds() >= th->renew_after;
|
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}
|
|
|
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static bool have_key(struct ceph_x_ticket_handler *th)
|
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{
|
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if (th->have_key) {
|
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if (get_seconds() >= th->expires)
|
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th->have_key = false;
|
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}
|
|
|
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return th->have_key;
|
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}
|
|
|
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static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed)
|
|
{
|
|
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;
|
|
|
|
if (!(ac->want_keys & service))
|
|
continue;
|
|
|
|
if (*pneed & service)
|
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continue;
|
|
|
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th = get_ticket_handler(ac, service);
|
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if (IS_ERR(th)) {
|
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*pneed |= service;
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continue;
|
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}
|
|
|
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if (need_key(th))
|
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*pneed |= service;
|
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if (!have_key(th))
|
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xi->have_keys &= ~service;
|
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}
|
|
}
|
|
|
|
static int ceph_x_build_request(struct ceph_auth_client *ac,
|
|
void *buf, void *end)
|
|
{
|
|
struct ceph_x_info *xi = ac->private;
|
|
int need;
|
|
struct ceph_x_request_header *head = buf;
|
|
int ret;
|
|
struct ceph_x_ticket_handler *th =
|
|
get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
|
|
|
|
if (IS_ERR(th))
|
|
return PTR_ERR(th);
|
|
|
|
ceph_x_validate_tickets(ac, &need);
|
|
|
|
dout("build_request want %x have %x need %x\n",
|
|
ac->want_keys, xi->have_keys, need);
|
|
|
|
if (need & CEPH_ENTITY_TYPE_AUTH) {
|
|
struct ceph_x_authenticate *auth = (void *)(head + 1);
|
|
void *p = auth + 1;
|
|
void *enc_buf = xi->auth_authorizer.enc_buf;
|
|
struct ceph_x_challenge_blob *blob = enc_buf +
|
|
ceph_x_encrypt_offset();
|
|
u64 *u;
|
|
|
|
if (p > end)
|
|
return -ERANGE;
|
|
|
|
dout(" get_auth_session_key\n");
|
|
head->op = cpu_to_le16(CEPHX_GET_AUTH_SESSION_KEY);
|
|
|
|
/* encrypt and hash */
|
|
get_random_bytes(&auth->client_challenge, sizeof(u64));
|
|
blob->client_challenge = auth->client_challenge;
|
|
blob->server_challenge = cpu_to_le64(xi->server_challenge);
|
|
ret = ceph_x_encrypt(&xi->secret, enc_buf, CEPHX_AU_ENC_BUF_LEN,
|
|
sizeof(*blob));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
auth->struct_v = 1;
|
|
auth->key = 0;
|
|
for (u = (u64 *)enc_buf; u + 1 <= (u64 *)(enc_buf + ret); u++)
|
|
auth->key ^= *(__le64 *)u;
|
|
dout(" server_challenge %llx client_challenge %llx key %llx\n",
|
|
xi->server_challenge, le64_to_cpu(auth->client_challenge),
|
|
le64_to_cpu(auth->key));
|
|
|
|
/* now encode the old ticket if exists */
|
|
ret = ceph_x_encode_ticket(th, &p, end);
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
return p - buf;
|
|
}
|
|
|
|
if (need) {
|
|
void *p = head + 1;
|
|
struct ceph_x_service_ticket_request *req;
|
|
|
|
if (p > end)
|
|
return -ERANGE;
|
|
head->op = cpu_to_le16(CEPHX_GET_PRINCIPAL_SESSION_KEY);
|
|
|
|
ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer);
|
|
if (ret)
|
|
return ret;
|
|
ceph_encode_copy(&p, xi->auth_authorizer.buf->vec.iov_base,
|
|
xi->auth_authorizer.buf->vec.iov_len);
|
|
|
|
req = p;
|
|
req->keys = cpu_to_le32(need);
|
|
p += sizeof(*req);
|
|
return p - buf;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
|
|
void *buf, void *end)
|
|
{
|
|
struct ceph_x_info *xi = ac->private;
|
|
struct ceph_x_reply_header *head = buf;
|
|
struct ceph_x_ticket_handler *th;
|
|
int len = end - buf;
|
|
int op;
|
|
int ret;
|
|
|
|
if (result)
|
|
return result; /* XXX hmm? */
|
|
|
|
if (xi->starting) {
|
|
/* it's a hello */
|
|
struct ceph_x_server_challenge *sc = buf;
|
|
|
|
if (len != sizeof(*sc))
|
|
return -EINVAL;
|
|
xi->server_challenge = le64_to_cpu(sc->server_challenge);
|
|
dout("handle_reply got server challenge %llx\n",
|
|
xi->server_challenge);
|
|
xi->starting = false;
|
|
xi->have_keys &= ~CEPH_ENTITY_TYPE_AUTH;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
op = le16_to_cpu(head->op);
|
|
result = le32_to_cpu(head->result);
|
|
dout("handle_reply op %d result %d\n", op, result);
|
|
switch (op) {
|
|
case CEPHX_GET_AUTH_SESSION_KEY:
|
|
/* verify auth key */
|
|
ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
|
|
buf + sizeof(*head), end);
|
|
break;
|
|
|
|
case CEPHX_GET_PRINCIPAL_SESSION_KEY:
|
|
th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH);
|
|
if (IS_ERR(th))
|
|
return PTR_ERR(th);
|
|
ret = ceph_x_proc_ticket_reply(ac, &th->session_key,
|
|
buf + sizeof(*head), end);
|
|
break;
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if (ret)
|
|
return ret;
|
|
if (ac->want_keys == xi->have_keys)
|
|
return 0;
|
|
return -EAGAIN;
|
|
}
|
|
|
|
static void ceph_x_destroy_authorizer(struct ceph_authorizer *a)
|
|
{
|
|
struct ceph_x_authorizer *au = (void *)a;
|
|
|
|
ceph_x_authorizer_cleanup(au);
|
|
kfree(au);
|
|
}
|
|
|
|
static int ceph_x_create_authorizer(
|
|
struct ceph_auth_client *ac, int peer_type,
|
|
struct ceph_auth_handshake *auth)
|
|
{
|
|
struct ceph_x_authorizer *au;
|
|
struct ceph_x_ticket_handler *th;
|
|
int ret;
|
|
|
|
th = get_ticket_handler(ac, peer_type);
|
|
if (IS_ERR(th))
|
|
return PTR_ERR(th);
|
|
|
|
au = kzalloc(sizeof(*au), GFP_NOFS);
|
|
if (!au)
|
|
return -ENOMEM;
|
|
|
|
au->base.destroy = ceph_x_destroy_authorizer;
|
|
|
|
ret = ceph_x_build_authorizer(ac, th, au);
|
|
if (ret) {
|
|
kfree(au);
|
|
return ret;
|
|
}
|
|
|
|
auth->authorizer = (struct ceph_authorizer *) au;
|
|
auth->authorizer_buf = au->buf->vec.iov_base;
|
|
auth->authorizer_buf_len = au->buf->vec.iov_len;
|
|
auth->authorizer_reply_buf = au->enc_buf;
|
|
auth->authorizer_reply_buf_len = CEPHX_AU_ENC_BUF_LEN;
|
|
auth->sign_message = ac->ops->sign_message;
|
|
auth->check_message_signature = ac->ops->check_message_signature;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_x_update_authorizer(
|
|
struct ceph_auth_client *ac, int peer_type,
|
|
struct ceph_auth_handshake *auth)
|
|
{
|
|
struct ceph_x_authorizer *au;
|
|
struct ceph_x_ticket_handler *th;
|
|
|
|
th = get_ticket_handler(ac, peer_type);
|
|
if (IS_ERR(th))
|
|
return PTR_ERR(th);
|
|
|
|
au = (struct ceph_x_authorizer *)auth->authorizer;
|
|
if (au->secret_id < th->secret_id) {
|
|
dout("ceph_x_update_authorizer service %u secret %llu < %llu\n",
|
|
au->service, au->secret_id, th->secret_id);
|
|
return ceph_x_build_authorizer(ac, th, au);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int decrypt_authorize_challenge(struct ceph_x_authorizer *au,
|
|
void *challenge_buf,
|
|
int challenge_buf_len,
|
|
u64 *server_challenge)
|
|
{
|
|
struct ceph_x_authorize_challenge *ch =
|
|
challenge_buf + sizeof(struct ceph_x_encrypt_header);
|
|
int ret;
|
|
|
|
/* no leading len */
|
|
ret = __ceph_x_decrypt(&au->session_key, challenge_buf,
|
|
challenge_buf_len);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof(*ch)) {
|
|
pr_err("bad size %d for ceph_x_authorize_challenge\n", ret);
|
|
return -EINVAL;
|
|
}
|
|
|
|
*server_challenge = le64_to_cpu(ch->server_challenge);
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac,
|
|
struct ceph_authorizer *a,
|
|
void *challenge_buf,
|
|
int challenge_buf_len)
|
|
{
|
|
struct ceph_x_authorizer *au = (void *)a;
|
|
u64 server_challenge;
|
|
int ret;
|
|
|
|
ret = decrypt_authorize_challenge(au, challenge_buf, challenge_buf_len,
|
|
&server_challenge);
|
|
if (ret) {
|
|
pr_err("failed to decrypt authorize challenge: %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
ret = encrypt_authorizer(au, &server_challenge);
|
|
if (ret) {
|
|
pr_err("failed to encrypt authorizer w/ challenge: %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac,
|
|
struct ceph_authorizer *a)
|
|
{
|
|
struct ceph_x_authorizer *au = (void *)a;
|
|
void *p = au->enc_buf;
|
|
struct ceph_x_authorize_reply *reply = p + ceph_x_encrypt_offset();
|
|
int ret;
|
|
|
|
ret = ceph_x_decrypt(&au->session_key, &p, p + CEPHX_AU_ENC_BUF_LEN);
|
|
if (ret < 0)
|
|
return ret;
|
|
if (ret < sizeof(*reply)) {
|
|
pr_err("bad size %d for ceph_x_authorize_reply\n", ret);
|
|
return -EINVAL;
|
|
}
|
|
|
|
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_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);
|
|
}
|
|
|
|
ceph_x_authorizer_cleanup(&xi->auth_authorizer);
|
|
|
|
kfree(ac->private);
|
|
ac->private = NULL;
|
|
}
|
|
|
|
static void invalidate_ticket(struct ceph_auth_client *ac, int peer_type)
|
|
{
|
|
struct ceph_x_ticket_handler *th;
|
|
|
|
th = get_ticket_handler(ac, peer_type);
|
|
if (!IS_ERR(th))
|
|
th->have_key = false;
|
|
}
|
|
|
|
static void ceph_x_invalidate_authorizer(struct ceph_auth_client *ac,
|
|
int peer_type)
|
|
{
|
|
/*
|
|
* We are to invalidate a service ticket in the hopes of
|
|
* getting a new, hopefully more valid, one. But, we won't get
|
|
* it unless our AUTH ticket is good, so invalidate AUTH ticket
|
|
* as well, just in case.
|
|
*/
|
|
invalidate_ticket(ac, peer_type);
|
|
invalidate_ticket(ac, CEPH_ENTITY_TYPE_AUTH);
|
|
}
|
|
|
|
static int calc_signature(struct ceph_x_authorizer *au, struct ceph_msg *msg,
|
|
__le64 *psig)
|
|
{
|
|
void *enc_buf = au->enc_buf;
|
|
int ret;
|
|
|
|
if (!(msg->con->peer_features & CEPH_FEATURE_CEPHX_V2)) {
|
|
struct {
|
|
__le32 len;
|
|
__le32 header_crc;
|
|
__le32 front_crc;
|
|
__le32 middle_crc;
|
|
__le32 data_crc;
|
|
} __packed *sigblock = enc_buf + ceph_x_encrypt_offset();
|
|
|
|
sigblock->len = cpu_to_le32(4*sizeof(u32));
|
|
sigblock->header_crc = msg->hdr.crc;
|
|
sigblock->front_crc = msg->footer.front_crc;
|
|
sigblock->middle_crc = msg->footer.middle_crc;
|
|
sigblock->data_crc = msg->footer.data_crc;
|
|
|
|
ret = ceph_x_encrypt(&au->session_key, enc_buf,
|
|
CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock));
|
|
if (ret < 0)
|
|
return ret;
|
|
|
|
*psig = *(__le64 *)(enc_buf + sizeof(u32));
|
|
} else {
|
|
struct {
|
|
__le32 header_crc;
|
|
__le32 front_crc;
|
|
__le32 front_len;
|
|
__le32 middle_crc;
|
|
__le32 middle_len;
|
|
__le32 data_crc;
|
|
__le32 data_len;
|
|
__le32 seq_lower_word;
|
|
} __packed *sigblock = enc_buf;
|
|
struct {
|
|
__le64 a, b, c, d;
|
|
} __packed *penc = enc_buf;
|
|
int ciphertext_len;
|
|
|
|
sigblock->header_crc = msg->hdr.crc;
|
|
sigblock->front_crc = msg->footer.front_crc;
|
|
sigblock->front_len = msg->hdr.front_len;
|
|
sigblock->middle_crc = msg->footer.middle_crc;
|
|
sigblock->middle_len = msg->hdr.middle_len;
|
|
sigblock->data_crc = msg->footer.data_crc;
|
|
sigblock->data_len = msg->hdr.data_len;
|
|
sigblock->seq_lower_word = *(__le32 *)&msg->hdr.seq;
|
|
|
|
/* no leading len, no ceph_x_encrypt_header */
|
|
ret = ceph_crypt(&au->session_key, true, enc_buf,
|
|
CEPHX_AU_ENC_BUF_LEN, sizeof(*sigblock),
|
|
&ciphertext_len);
|
|
if (ret)
|
|
return ret;
|
|
|
|
*psig = penc->a ^ penc->b ^ penc->c ^ penc->d;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_x_sign_message(struct ceph_auth_handshake *auth,
|
|
struct ceph_msg *msg)
|
|
{
|
|
__le64 sig;
|
|
int ret;
|
|
|
|
if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
|
|
return 0;
|
|
|
|
ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
|
|
msg, &sig);
|
|
if (ret)
|
|
return ret;
|
|
|
|
msg->footer.sig = sig;
|
|
msg->footer.flags |= CEPH_MSG_FOOTER_SIGNED;
|
|
return 0;
|
|
}
|
|
|
|
static int ceph_x_check_message_signature(struct ceph_auth_handshake *auth,
|
|
struct ceph_msg *msg)
|
|
{
|
|
__le64 sig_check;
|
|
int ret;
|
|
|
|
if (ceph_test_opt(from_msgr(msg->con->msgr), NOMSGSIGN))
|
|
return 0;
|
|
|
|
ret = calc_signature((struct ceph_x_authorizer *)auth->authorizer,
|
|
msg, &sig_check);
|
|
if (ret)
|
|
return ret;
|
|
if (sig_check == msg->footer.sig)
|
|
return 0;
|
|
if (msg->footer.flags & CEPH_MSG_FOOTER_SIGNED)
|
|
dout("ceph_x_check_message_signature %p has signature %llx "
|
|
"expect %llx\n", msg, msg->footer.sig, sig_check);
|
|
else
|
|
dout("ceph_x_check_message_signature %p sender did not set "
|
|
"CEPH_MSG_FOOTER_SIGNED\n", msg);
|
|
return -EBADMSG;
|
|
}
|
|
|
|
static const struct ceph_auth_client_ops ceph_x_ops = {
|
|
.name = "x",
|
|
.is_authenticated = ceph_x_is_authenticated,
|
|
.should_authenticate = ceph_x_should_authenticate,
|
|
.build_request = ceph_x_build_request,
|
|
.handle_reply = ceph_x_handle_reply,
|
|
.create_authorizer = ceph_x_create_authorizer,
|
|
.update_authorizer = ceph_x_update_authorizer,
|
|
.add_authorizer_challenge = ceph_x_add_authorizer_challenge,
|
|
.verify_authorizer_reply = ceph_x_verify_authorizer_reply,
|
|
.invalidate_authorizer = ceph_x_invalidate_authorizer,
|
|
.reset = ceph_x_reset,
|
|
.destroy = ceph_x_destroy,
|
|
.sign_message = ceph_x_sign_message,
|
|
.check_message_signature = ceph_x_check_message_signature,
|
|
};
|
|
|
|
|
|
int ceph_x_init(struct ceph_auth_client *ac)
|
|
{
|
|
struct ceph_x_info *xi;
|
|
int ret;
|
|
|
|
dout("ceph_x_init %p\n", ac);
|
|
ret = -ENOMEM;
|
|
xi = kzalloc(sizeof(*xi), GFP_NOFS);
|
|
if (!xi)
|
|
goto out;
|
|
|
|
ret = -EINVAL;
|
|
if (!ac->key) {
|
|
pr_err("no secret set (for auth_x protocol)\n");
|
|
goto out_nomem;
|
|
}
|
|
|
|
ret = ceph_crypto_key_clone(&xi->secret, ac->key);
|
|
if (ret < 0) {
|
|
pr_err("cannot clone key: %d\n", ret);
|
|
goto out_nomem;
|
|
}
|
|
|
|
xi->starting = true;
|
|
xi->ticket_handlers = RB_ROOT;
|
|
|
|
ac->protocol = CEPH_AUTH_CEPHX;
|
|
ac->private = xi;
|
|
ac->ops = &ceph_x_ops;
|
|
return 0;
|
|
|
|
out_nomem:
|
|
kfree(xi);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
|