forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
1122 lines
27 KiB
1122 lines
27 KiB
// SPDX-License-Identifier: GPL-2.0 |
|
|
|
#include <linux/ceph/ceph_debug.h> |
|
|
|
#include <linux/err.h> |
|
#include <linux/module.h> |
|
#include <linux/random.h> |
|
#include <linux/slab.h> |
|
|
|
#include <linux/ceph/decode.h> |
|
#include <linux/ceph/auth.h> |
|
#include <linux/ceph/ceph_features.h> |
|
#include <linux/ceph/libceph.h> |
|
#include <linux/ceph/messenger.h> |
|
|
|
#include "crypto.h" |
|
#include "auth_x.h" |
|
#include "auth_x_protocol.h" |
|
|
|
static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed); |
|
|
|
static int ceph_x_is_authenticated(struct ceph_auth_client *ac) |
|
{ |
|
struct ceph_x_info *xi = ac->private; |
|
int missing; |
|
int need; /* missing + need renewal */ |
|
|
|
ceph_x_validate_tickets(ac, &need); |
|
missing = ac->want_keys & ~xi->have_keys; |
|
WARN_ON((need & missing) != missing); |
|
dout("%s want 0x%x have 0x%x missing 0x%x -> %d\n", __func__, |
|
ac->want_keys, xi->have_keys, missing, !missing); |
|
return !missing; |
|
} |
|
|
|
static int ceph_x_should_authenticate(struct ceph_auth_client *ac) |
|
{ |
|
struct ceph_x_info *xi = ac->private; |
|
int need; |
|
|
|
ceph_x_validate_tickets(ac, &need); |
|
dout("%s want 0x%x have 0x%x need 0x%x -> %d\n", __func__, |
|
ac->want_keys, xi->have_keys, need, !!need); |
|
return !!need; |
|
} |
|
|
|
static int ceph_x_encrypt_offset(void) |
|
{ |
|
return sizeof(u32) + sizeof(struct ceph_x_encrypt_header); |
|
} |
|
|
|
static int ceph_x_encrypt_buflen(int ilen) |
|
{ |
|
return ceph_x_encrypt_offset() + ilen + 16; |
|
} |
|
|
|
static int ceph_x_encrypt(struct ceph_crypto_key *secret, void *buf, |
|
int buf_len, int plaintext_len) |
|
{ |
|
struct ceph_x_encrypt_header *hdr = buf + sizeof(u32); |
|
int ciphertext_len; |
|
int ret; |
|
|
|
hdr->struct_v = 1; |
|
hdr->magic = cpu_to_le64(CEPHX_ENC_MAGIC); |
|
|
|
ret = ceph_crypt(secret, true, buf + sizeof(u32), buf_len - sizeof(u32), |
|
plaintext_len + sizeof(struct ceph_x_encrypt_header), |
|
&ciphertext_len); |
|
if (ret) |
|
return ret; |
|
|
|
ceph_encode_32(&buf, ciphertext_len); |
|
return sizeof(u32) + ciphertext_len; |
|
} |
|
|
|
static int __ceph_x_decrypt(struct ceph_crypto_key *secret, void *p, |
|
int ciphertext_len) |
|
{ |
|
struct ceph_x_encrypt_header *hdr = p; |
|
int plaintext_len; |
|
int ret; |
|
|
|
ret = ceph_crypt(secret, false, p, ciphertext_len, ciphertext_len, |
|
&plaintext_len); |
|
if (ret) |
|
return ret; |
|
|
|
if (le64_to_cpu(hdr->magic) != CEPHX_ENC_MAGIC) { |
|
pr_err("%s bad magic\n", __func__); |
|
return -EINVAL; |
|
} |
|
|
|
return plaintext_len - sizeof(*hdr); |
|
} |
|
|
|
static int ceph_x_decrypt(struct ceph_crypto_key *secret, void **p, void *end) |
|
{ |
|
int ciphertext_len; |
|
int ret; |
|
|
|
ceph_decode_32_safe(p, end, ciphertext_len, e_inval); |
|
ceph_decode_need(p, end, ciphertext_len, e_inval); |
|
|
|
ret = __ceph_x_decrypt(secret, *p, ciphertext_len); |
|
if (ret < 0) |
|
return ret; |
|
|
|
*p += ciphertext_len; |
|
return ret; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* get existing (or insert new) ticket handler |
|
*/ |
|
static struct ceph_x_ticket_handler * |
|
get_ticket_handler(struct ceph_auth_client *ac, int service) |
|
{ |
|
struct ceph_x_ticket_handler *th; |
|
struct ceph_x_info *xi = ac->private; |
|
struct rb_node *parent = NULL, **p = &xi->ticket_handlers.rb_node; |
|
|
|
while (*p) { |
|
parent = *p; |
|
th = rb_entry(parent, struct ceph_x_ticket_handler, node); |
|
if (service < th->service) |
|
p = &(*p)->rb_left; |
|
else if (service > th->service) |
|
p = &(*p)->rb_right; |
|
else |
|
return th; |
|
} |
|
|
|
/* add it */ |
|
th = kzalloc(sizeof(*th), GFP_NOFS); |
|
if (!th) |
|
return ERR_PTR(-ENOMEM); |
|
th->service = service; |
|
rb_link_node(&th->node, parent, p); |
|
rb_insert_color(&th->node, &xi->ticket_handlers); |
|
return th; |
|
} |
|
|
|
static void remove_ticket_handler(struct ceph_auth_client *ac, |
|
struct ceph_x_ticket_handler *th) |
|
{ |
|
struct ceph_x_info *xi = ac->private; |
|
|
|
dout("remove_ticket_handler %p %d\n", th, th->service); |
|
rb_erase(&th->node, &xi->ticket_handlers); |
|
ceph_crypto_key_destroy(&th->session_key); |
|
if (th->ticket_blob) |
|
ceph_buffer_put(th->ticket_blob); |
|
kfree(th); |
|
} |
|
|
|
static int process_one_ticket(struct ceph_auth_client *ac, |
|
struct ceph_crypto_key *secret, |
|
void **p, void *end) |
|
{ |
|
struct ceph_x_info *xi = ac->private; |
|
int type; |
|
u8 tkt_struct_v, blob_struct_v; |
|
struct ceph_x_ticket_handler *th; |
|
void *dp, *dend; |
|
int dlen; |
|
char is_enc; |
|
struct timespec64 validity; |
|
void *tp, *tpend; |
|
void **ptp; |
|
struct ceph_crypto_key new_session_key = { 0 }; |
|
struct ceph_buffer *new_ticket_blob; |
|
time64_t new_expires, new_renew_after; |
|
u64 new_secret_id; |
|
int ret; |
|
|
|
ceph_decode_need(p, end, sizeof(u32) + 1, bad); |
|
|
|
type = ceph_decode_32(p); |
|
dout(" ticket type %d %s\n", type, ceph_entity_type_name(type)); |
|
|
|
tkt_struct_v = ceph_decode_8(p); |
|
if (tkt_struct_v != 1) |
|
goto bad; |
|
|
|
th = get_ticket_handler(ac, type); |
|
if (IS_ERR(th)) { |
|
ret = PTR_ERR(th); |
|
goto out; |
|
} |
|
|
|
/* blob for me */ |
|
dp = *p + ceph_x_encrypt_offset(); |
|
ret = ceph_x_decrypt(secret, p, end); |
|
if (ret < 0) |
|
goto out; |
|
dout(" decrypted %d bytes\n", ret); |
|
dend = dp + ret; |
|
|
|
ceph_decode_8_safe(&dp, dend, tkt_struct_v, bad); |
|
if (tkt_struct_v != 1) |
|
goto bad; |
|
|
|
ret = ceph_crypto_key_decode(&new_session_key, &dp, dend); |
|
if (ret) |
|
goto out; |
|
|
|
ceph_decode_need(&dp, dend, sizeof(struct ceph_timespec), bad); |
|
ceph_decode_timespec64(&validity, dp); |
|
dp += sizeof(struct ceph_timespec); |
|
new_expires = ktime_get_real_seconds() + validity.tv_sec; |
|
new_renew_after = new_expires - (validity.tv_sec / 4); |
|
dout(" expires=%llu renew_after=%llu\n", new_expires, |
|
new_renew_after); |
|
|
|
/* ticket blob for service */ |
|
ceph_decode_8_safe(p, end, is_enc, bad); |
|
if (is_enc) { |
|
/* encrypted */ |
|
tp = *p + ceph_x_encrypt_offset(); |
|
ret = ceph_x_decrypt(&th->session_key, p, end); |
|
if (ret < 0) |
|
goto out; |
|
dout(" encrypted ticket, decrypted %d bytes\n", ret); |
|
ptp = &tp; |
|
tpend = tp + ret; |
|
} else { |
|
/* unencrypted */ |
|
ptp = p; |
|
tpend = end; |
|
} |
|
ceph_decode_32_safe(ptp, tpend, dlen, bad); |
|
dout(" ticket blob is %d bytes\n", dlen); |
|
ceph_decode_need(ptp, tpend, 1 + sizeof(u64), bad); |
|
blob_struct_v = ceph_decode_8(ptp); |
|
if (blob_struct_v != 1) |
|
goto bad; |
|
|
|
new_secret_id = ceph_decode_64(ptp); |
|
ret = ceph_decode_buffer(&new_ticket_blob, ptp, tpend); |
|
if (ret) |
|
goto out; |
|
|
|
/* all is well, update our ticket */ |
|
ceph_crypto_key_destroy(&th->session_key); |
|
if (th->ticket_blob) |
|
ceph_buffer_put(th->ticket_blob); |
|
th->session_key = new_session_key; |
|
th->ticket_blob = new_ticket_blob; |
|
th->secret_id = new_secret_id; |
|
th->expires = new_expires; |
|
th->renew_after = new_renew_after; |
|
th->have_key = true; |
|
dout(" got ticket service %d (%s) secret_id %lld len %d\n", |
|
type, ceph_entity_type_name(type), th->secret_id, |
|
(int)th->ticket_blob->vec.iov_len); |
|
xi->have_keys |= th->service; |
|
return 0; |
|
|
|
bad: |
|
ret = -EINVAL; |
|
out: |
|
ceph_crypto_key_destroy(&new_session_key); |
|
return ret; |
|
} |
|
|
|
static int ceph_x_proc_ticket_reply(struct ceph_auth_client *ac, |
|
struct ceph_crypto_key *secret, |
|
void **p, void *end) |
|
{ |
|
u8 reply_struct_v; |
|
u32 num; |
|
int ret; |
|
|
|
ceph_decode_8_safe(p, end, reply_struct_v, bad); |
|
if (reply_struct_v != 1) |
|
return -EINVAL; |
|
|
|
ceph_decode_32_safe(p, end, num, bad); |
|
dout("%d tickets\n", num); |
|
|
|
while (num--) { |
|
ret = process_one_ticket(ac, secret, p, end); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
|
|
bad: |
|
return -EINVAL; |
|
} |
|
|
|
/* |
|
* Encode and encrypt the second part (ceph_x_authorize_b) of the |
|
* authorizer. The first part (ceph_x_authorize_a) should already be |
|
* encoded. |
|
*/ |
|
static int encrypt_authorizer(struct ceph_x_authorizer *au, |
|
u64 *server_challenge) |
|
{ |
|
struct ceph_x_authorize_a *msg_a; |
|
struct ceph_x_authorize_b *msg_b; |
|
void *p, *end; |
|
int ret; |
|
|
|
msg_a = au->buf->vec.iov_base; |
|
WARN_ON(msg_a->ticket_blob.secret_id != cpu_to_le64(au->secret_id)); |
|
p = (void *)(msg_a + 1) + le32_to_cpu(msg_a->ticket_blob.blob_len); |
|
end = au->buf->vec.iov_base + au->buf->vec.iov_len; |
|
|
|
msg_b = p + ceph_x_encrypt_offset(); |
|
msg_b->struct_v = 2; |
|
msg_b->nonce = cpu_to_le64(au->nonce); |
|
if (server_challenge) { |
|
msg_b->have_challenge = 1; |
|
msg_b->server_challenge_plus_one = |
|
cpu_to_le64(*server_challenge + 1); |
|
} else { |
|
msg_b->have_challenge = 0; |
|
msg_b->server_challenge_plus_one = 0; |
|
} |
|
|
|
ret = ceph_x_encrypt(&au->session_key, p, end - p, sizeof(*msg_b)); |
|
if (ret < 0) |
|
return ret; |
|
|
|
p += ret; |
|
if (server_challenge) { |
|
WARN_ON(p != end); |
|
} else { |
|
WARN_ON(p > end); |
|
au->buf->vec.iov_len = p - au->buf->vec.iov_base; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
static void ceph_x_authorizer_cleanup(struct ceph_x_authorizer *au) |
|
{ |
|
ceph_crypto_key_destroy(&au->session_key); |
|
if (au->buf) { |
|
ceph_buffer_put(au->buf); |
|
au->buf = NULL; |
|
} |
|
} |
|
|
|
static int ceph_x_build_authorizer(struct ceph_auth_client *ac, |
|
struct ceph_x_ticket_handler *th, |
|
struct ceph_x_authorizer *au) |
|
{ |
|
int maxlen; |
|
struct ceph_x_authorize_a *msg_a; |
|
struct ceph_x_authorize_b *msg_b; |
|
int ret; |
|
int ticket_blob_len = |
|
(th->ticket_blob ? th->ticket_blob->vec.iov_len : 0); |
|
|
|
dout("build_authorizer for %s %p\n", |
|
ceph_entity_type_name(th->service), au); |
|
|
|
ceph_crypto_key_destroy(&au->session_key); |
|
ret = ceph_crypto_key_clone(&au->session_key, &th->session_key); |
|
if (ret) |
|
goto out_au; |
|
|
|
maxlen = sizeof(*msg_a) + ticket_blob_len + |
|
ceph_x_encrypt_buflen(sizeof(*msg_b)); |
|
dout(" need len %d\n", maxlen); |
|
if (au->buf && au->buf->alloc_len < maxlen) { |
|
ceph_buffer_put(au->buf); |
|
au->buf = NULL; |
|
} |
|
if (!au->buf) { |
|
au->buf = ceph_buffer_new(maxlen, GFP_NOFS); |
|
if (!au->buf) { |
|
ret = -ENOMEM; |
|
goto out_au; |
|
} |
|
} |
|
au->service = th->service; |
|
WARN_ON(!th->secret_id); |
|
au->secret_id = th->secret_id; |
|
|
|
msg_a = au->buf->vec.iov_base; |
|
msg_a->struct_v = 1; |
|
msg_a->global_id = cpu_to_le64(ac->global_id); |
|
msg_a->service_id = cpu_to_le32(th->service); |
|
msg_a->ticket_blob.struct_v = 1; |
|
msg_a->ticket_blob.secret_id = cpu_to_le64(th->secret_id); |
|
msg_a->ticket_blob.blob_len = cpu_to_le32(ticket_blob_len); |
|
if (ticket_blob_len) { |
|
memcpy(msg_a->ticket_blob.blob, th->ticket_blob->vec.iov_base, |
|
th->ticket_blob->vec.iov_len); |
|
} |
|
dout(" th %p secret_id %lld %lld\n", th, th->secret_id, |
|
le64_to_cpu(msg_a->ticket_blob.secret_id)); |
|
|
|
get_random_bytes(&au->nonce, sizeof(au->nonce)); |
|
ret = encrypt_authorizer(au, NULL); |
|
if (ret) { |
|
pr_err("failed to encrypt authorizer: %d", ret); |
|
goto out_au; |
|
} |
|
|
|
dout(" built authorizer nonce %llx len %d\n", au->nonce, |
|
(int)au->buf->vec.iov_len); |
|
return 0; |
|
|
|
out_au: |
|
ceph_x_authorizer_cleanup(au); |
|
return ret; |
|
} |
|
|
|
static int ceph_x_encode_ticket(struct ceph_x_ticket_handler *th, |
|
void **p, void *end) |
|
{ |
|
ceph_decode_need(p, end, 1 + sizeof(u64), bad); |
|
ceph_encode_8(p, 1); |
|
ceph_encode_64(p, th->secret_id); |
|
if (th->ticket_blob) { |
|
const char *buf = th->ticket_blob->vec.iov_base; |
|
u32 len = th->ticket_blob->vec.iov_len; |
|
|
|
ceph_encode_32_safe(p, end, len, bad); |
|
ceph_encode_copy_safe(p, end, buf, len, bad); |
|
} else { |
|
ceph_encode_32_safe(p, end, 0, bad); |
|
} |
|
|
|
return 0; |
|
bad: |
|
return -ERANGE; |
|
} |
|
|
|
static bool need_key(struct ceph_x_ticket_handler *th) |
|
{ |
|
if (!th->have_key) |
|
return true; |
|
|
|
return ktime_get_real_seconds() >= th->renew_after; |
|
} |
|
|
|
static bool have_key(struct ceph_x_ticket_handler *th) |
|
{ |
|
if (th->have_key && ktime_get_real_seconds() >= th->expires) { |
|
dout("ticket %d (%s) secret_id %llu expired\n", th->service, |
|
ceph_entity_type_name(th->service), th->secret_id); |
|
th->have_key = false; |
|
} |
|
|
|
return th->have_key; |
|
} |
|
|
|
static void ceph_x_validate_tickets(struct ceph_auth_client *ac, int *pneed) |
|
{ |
|
int want = ac->want_keys; |
|
struct ceph_x_info *xi = ac->private; |
|
int service; |
|
|
|
*pneed = ac->want_keys & ~(xi->have_keys); |
|
|
|
for (service = 1; service <= want; service <<= 1) { |
|
struct ceph_x_ticket_handler *th; |
|
|
|
if (!(ac->want_keys & service)) |
|
continue; |
|
|
|
if (*pneed & service) |
|
continue; |
|
|
|
th = get_ticket_handler(ac, service); |
|
if (IS_ERR(th)) { |
|
*pneed |= service; |
|
continue; |
|
} |
|
|
|
if (need_key(th)) |
|
*pneed |= service; |
|
if (!have_key(th)) |
|
xi->have_keys &= ~service; |
|
} |
|
} |
|
|
|
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; |
|
void *p; |
|
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("%s want 0x%x have 0x%x need 0x%x\n", __func__, ac->want_keys, |
|
xi->have_keys, need); |
|
|
|
if (need & CEPH_ENTITY_TYPE_AUTH) { |
|
struct ceph_x_authenticate *auth = (void *)(head + 1); |
|
void *enc_buf = xi->auth_authorizer.enc_buf; |
|
struct ceph_x_challenge_blob *blob = enc_buf + |
|
ceph_x_encrypt_offset(); |
|
u64 *u; |
|
|
|
p = auth + 1; |
|
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 = 3; /* nautilus+ */ |
|
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; |
|
|
|
/* nautilus+: request service tickets at the same time */ |
|
need = ac->want_keys & ~CEPH_ENTITY_TYPE_AUTH; |
|
WARN_ON(!need); |
|
ceph_encode_32_safe(&p, end, need, e_range); |
|
return p - buf; |
|
} |
|
|
|
if (need) { |
|
dout(" get_principal_session_key\n"); |
|
ret = ceph_x_build_authorizer(ac, th, &xi->auth_authorizer); |
|
if (ret) |
|
return ret; |
|
|
|
p = buf; |
|
ceph_encode_16_safe(&p, end, CEPHX_GET_PRINCIPAL_SESSION_KEY, |
|
e_range); |
|
ceph_encode_copy_safe(&p, end, |
|
xi->auth_authorizer.buf->vec.iov_base, |
|
xi->auth_authorizer.buf->vec.iov_len, e_range); |
|
ceph_encode_8_safe(&p, end, 1, e_range); |
|
ceph_encode_32_safe(&p, end, need, e_range); |
|
return p - buf; |
|
} |
|
|
|
return 0; |
|
|
|
e_range: |
|
return -ERANGE; |
|
} |
|
|
|
static int decode_con_secret(void **p, void *end, u8 *con_secret, |
|
int *con_secret_len) |
|
{ |
|
int len; |
|
|
|
ceph_decode_32_safe(p, end, len, bad); |
|
ceph_decode_need(p, end, len, bad); |
|
|
|
dout("%s len %d\n", __func__, len); |
|
if (con_secret) { |
|
if (len > CEPH_MAX_CON_SECRET_LEN) { |
|
pr_err("connection secret too big %d\n", len); |
|
goto bad_memzero; |
|
} |
|
memcpy(con_secret, *p, len); |
|
*con_secret_len = len; |
|
} |
|
memzero_explicit(*p, len); |
|
*p += len; |
|
return 0; |
|
|
|
bad_memzero: |
|
memzero_explicit(*p, len); |
|
bad: |
|
pr_err("failed to decode connection secret\n"); |
|
return -EINVAL; |
|
} |
|
|
|
static int handle_auth_session_key(struct ceph_auth_client *ac, u64 global_id, |
|
void **p, void *end, |
|
u8 *session_key, int *session_key_len, |
|
u8 *con_secret, int *con_secret_len) |
|
{ |
|
struct ceph_x_info *xi = ac->private; |
|
struct ceph_x_ticket_handler *th; |
|
void *dp, *dend; |
|
int len; |
|
int ret; |
|
|
|
/* AUTH ticket */ |
|
ret = ceph_x_proc_ticket_reply(ac, &xi->secret, p, end); |
|
if (ret) |
|
return ret; |
|
|
|
ceph_auth_set_global_id(ac, global_id); |
|
if (*p == end) { |
|
/* pre-nautilus (or didn't request service tickets!) */ |
|
WARN_ON(session_key || con_secret); |
|
return 0; |
|
} |
|
|
|
th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); |
|
if (IS_ERR(th)) |
|
return PTR_ERR(th); |
|
|
|
if (session_key) { |
|
memcpy(session_key, th->session_key.key, th->session_key.len); |
|
*session_key_len = th->session_key.len; |
|
} |
|
|
|
/* connection secret */ |
|
ceph_decode_32_safe(p, end, len, e_inval); |
|
dout("%s connection secret blob len %d\n", __func__, len); |
|
if (len > 0) { |
|
dp = *p + ceph_x_encrypt_offset(); |
|
ret = ceph_x_decrypt(&th->session_key, p, *p + len); |
|
if (ret < 0) |
|
return ret; |
|
|
|
dout("%s decrypted %d bytes\n", __func__, ret); |
|
dend = dp + ret; |
|
|
|
ret = decode_con_secret(&dp, dend, con_secret, con_secret_len); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
/* service tickets */ |
|
ceph_decode_32_safe(p, end, len, e_inval); |
|
dout("%s service tickets blob len %d\n", __func__, len); |
|
if (len > 0) { |
|
ret = ceph_x_proc_ticket_reply(ac, &th->session_key, |
|
p, *p + len); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
static int ceph_x_handle_reply(struct ceph_auth_client *ac, u64 global_id, |
|
void *buf, void *end, |
|
u8 *session_key, int *session_key_len, |
|
u8 *con_secret, int *con_secret_len) |
|
{ |
|
struct ceph_x_info *xi = ac->private; |
|
struct ceph_x_ticket_handler *th; |
|
int len = end - buf; |
|
int result; |
|
void *p; |
|
int op; |
|
int ret; |
|
|
|
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; |
|
} |
|
|
|
p = buf; |
|
ceph_decode_16_safe(&p, end, op, e_inval); |
|
ceph_decode_32_safe(&p, end, result, e_inval); |
|
dout("handle_reply op %d result %d\n", op, result); |
|
switch (op) { |
|
case CEPHX_GET_AUTH_SESSION_KEY: |
|
/* AUTH ticket + [connection secret] + service tickets */ |
|
ret = handle_auth_session_key(ac, global_id, &p, end, |
|
session_key, session_key_len, |
|
con_secret, con_secret_len); |
|
break; |
|
|
|
case CEPHX_GET_PRINCIPAL_SESSION_KEY: |
|
th = get_ticket_handler(ac, CEPH_ENTITY_TYPE_AUTH); |
|
if (IS_ERR(th)) |
|
return PTR_ERR(th); |
|
|
|
/* service tickets */ |
|
ret = ceph_x_proc_ticket_reply(ac, &th->session_key, &p, end); |
|
break; |
|
|
|
default: |
|
return -EINVAL; |
|
} |
|
if (ret) |
|
return ret; |
|
if (ac->want_keys == xi->have_keys) |
|
return 0; |
|
return -EAGAIN; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
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; |
|
} |
|
|
|
/* |
|
* CephXAuthorizeChallenge |
|
*/ |
|
static int decrypt_authorizer_challenge(struct ceph_crypto_key *secret, |
|
void *challenge, int challenge_len, |
|
u64 *server_challenge) |
|
{ |
|
void *dp, *dend; |
|
int ret; |
|
|
|
/* no leading len */ |
|
ret = __ceph_x_decrypt(secret, challenge, challenge_len); |
|
if (ret < 0) |
|
return ret; |
|
|
|
dout("%s decrypted %d bytes\n", __func__, ret); |
|
dp = challenge + sizeof(struct ceph_x_encrypt_header); |
|
dend = dp + ret; |
|
|
|
ceph_decode_skip_8(&dp, dend, e_inval); /* struct_v */ |
|
ceph_decode_64_safe(&dp, dend, *server_challenge, e_inval); |
|
dout("%s server_challenge %llu\n", __func__, *server_challenge); |
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
static int ceph_x_add_authorizer_challenge(struct ceph_auth_client *ac, |
|
struct ceph_authorizer *a, |
|
void *challenge, int challenge_len) |
|
{ |
|
struct ceph_x_authorizer *au = (void *)a; |
|
u64 server_challenge; |
|
int ret; |
|
|
|
ret = decrypt_authorizer_challenge(&au->session_key, challenge, |
|
challenge_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; |
|
} |
|
|
|
/* |
|
* CephXAuthorizeReply |
|
*/ |
|
static int decrypt_authorizer_reply(struct ceph_crypto_key *secret, |
|
void **p, void *end, u64 *nonce_plus_one, |
|
u8 *con_secret, int *con_secret_len) |
|
{ |
|
void *dp, *dend; |
|
u8 struct_v; |
|
int ret; |
|
|
|
dp = *p + ceph_x_encrypt_offset(); |
|
ret = ceph_x_decrypt(secret, p, end); |
|
if (ret < 0) |
|
return ret; |
|
|
|
dout("%s decrypted %d bytes\n", __func__, ret); |
|
dend = dp + ret; |
|
|
|
ceph_decode_8_safe(&dp, dend, struct_v, e_inval); |
|
ceph_decode_64_safe(&dp, dend, *nonce_plus_one, e_inval); |
|
dout("%s nonce_plus_one %llu\n", __func__, *nonce_plus_one); |
|
if (struct_v >= 2) { |
|
ret = decode_con_secret(&dp, dend, con_secret, con_secret_len); |
|
if (ret) |
|
return ret; |
|
} |
|
|
|
return 0; |
|
|
|
e_inval: |
|
return -EINVAL; |
|
} |
|
|
|
static int ceph_x_verify_authorizer_reply(struct ceph_auth_client *ac, |
|
struct ceph_authorizer *a, |
|
void *reply, int reply_len, |
|
u8 *session_key, int *session_key_len, |
|
u8 *con_secret, int *con_secret_len) |
|
{ |
|
struct ceph_x_authorizer *au = (void *)a; |
|
u64 nonce_plus_one; |
|
int ret; |
|
|
|
if (session_key) { |
|
memcpy(session_key, au->session_key.key, au->session_key.len); |
|
*session_key_len = au->session_key.len; |
|
} |
|
|
|
ret = decrypt_authorizer_reply(&au->session_key, &reply, |
|
reply + reply_len, &nonce_plus_one, |
|
con_secret, con_secret_len); |
|
if (ret) |
|
return ret; |
|
|
|
if (nonce_plus_one != au->nonce + 1) { |
|
pr_err("failed to authenticate server\n"); |
|
return -EPERM; |
|
} |
|
|
|
return 0; |
|
} |
|
|
|
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)) |
|
return; |
|
|
|
if (th->have_key) { |
|
dout("ticket %d (%s) secret_id %llu invalidated\n", |
|
th->service, ceph_entity_type_name(th->service), |
|
th->secret_id); |
|
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 (!CEPH_HAVE_FEATURE(msg->con->peer_features, 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 = { |
|
.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; |
|
}
|
|
|