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libceph: safer en/decoding of cephx requests and replies 

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Ilya Dryomov 2020-10-12 15:05:09 +02:00
parent f79e25b087
commit 6610fff278
1 changed files with 26 additions and 21 deletions
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47
net/ceph/auth_x.c
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@ -200,7 +200,7 @@ static int process_one_ticket(struct ceph_auth_client *ac,
dout(" decrypted %d bytes\n", ret);
dend = dp + ret;
tkt_struct_v = ceph_decode_8(&dp);
ceph_decode_8_safe(&dp, dend, tkt_struct_v, bad);
if (tkt_struct_v != 1)
goto bad;
@ -208,6 +208,7 @@ static int process_one_ticket(struct ceph_auth_client *ac,
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;
@ -491,6 +492,7 @@ static int ceph_x_build_request(struct ceph_auth_client *ac,
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);
@ -504,12 +506,12 @@ static int ceph_x_build_request(struct ceph_auth_client *ac,
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;
p = auth + 1;
if (p > end)
return -ERANGE;
@ -542,35 +544,35 @@ static int ceph_x_build_request(struct ceph_auth_client *ac,
}
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);
dout(" get_principal_session_key\n");
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);
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 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;
void *p;
int op;
int ret;
@ -591,22 +593,22 @@ static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
return -EAGAIN;
}
op = le16_to_cpu(head->op);
result = le32_to_cpu(head->result);
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:
/* verify auth key */
ret = ceph_x_proc_ticket_reply(ac, &xi->secret,
buf + sizeof(*head), end);
ret = ceph_x_proc_ticket_reply(ac, &xi->secret, p, 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);
ret = ceph_x_proc_ticket_reply(ac, &th->session_key, p, end);
break;
default:
@ -617,6 +619,9 @@ static int ceph_x_handle_reply(struct ceph_auth_client *ac, int result,
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)