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libceph: zero out session key and connection secret 

Try and avoid leaving bits and pieces of session key and connection
secret (gets split into GCM key and a pair of GCM IVs) around.

Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
master
Ilya Dryomov 2020-12-22 19:00:48 +01:00
parent e71ba9452f
commit 10f42b3e64
3 changed files with 62 additions and 43 deletions
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57
net/ceph/auth_x.c
View File

@ -569,6 +569,34 @@ 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,
void **p, void *end,
u8 *session_key, int *session_key_len,
@ -612,17 +640,9 @@ static int handle_auth_session_key(struct ceph_auth_client *ac,
dout("%s decrypted %d bytes\n", __func__, ret);
dend = dp + ret;
ceph_decode_32_safe(&dp, dend, len, e_inval);
if (len > CEPH_MAX_CON_SECRET_LEN) {
pr_err("connection secret too big %d\n", len);
return -EINVAL;
}
dout("%s connection secret len %d\n", __func__, len);
if (con_secret) {
memcpy(con_secret, dp, len);
*con_secret_len = len;
}
ret = decode_con_secret(&dp, dend, con_secret, con_secret_len);
if (ret)
return ret;
}
/* service tickets */
@ -828,7 +848,6 @@ static int decrypt_authorizer_reply(struct ceph_crypto_key *secret,
{
void *dp, *dend;
u8 struct_v;
int len;
int ret;
dp = *p + ceph_x_encrypt_offset();
@ -843,17 +862,9 @@ static int decrypt_authorizer_reply(struct ceph_crypto_key *secret,
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) {
ceph_decode_32_safe(&dp, dend, len, e_inval);
if (len > CEPH_MAX_CON_SECRET_LEN) {
pr_err("connection secret too big %d\n", len);
return -EINVAL;
}
dout("%s connection secret len %d\n", __func__, len);
if (con_secret) {
memcpy(con_secret, dp, len);
*con_secret_len = len;
}
ret = decode_con_secret(&dp, dend, con_secret, con_secret_len);
if (ret)
return ret;
}
return 0;

3
net/ceph/crypto.c
View File

@ -96,6 +96,7 @@ int ceph_crypto_key_decode(struct ceph_crypto_key *key, void **p, void *end)
key->len = ceph_decode_16(p);
ceph_decode_need(p, end, key->len, bad);
ret = set_secret(key, *p);
memzero_explicit(*p, key->len);
*p += key->len;
return ret;
@ -134,7 +135,7 @@ int ceph_crypto_key_unarmor(struct ceph_crypto_key *key, const char *inkey)
void ceph_crypto_key_destroy(struct ceph_crypto_key *key)
{
if (key) {
kfree(key->key);
kfree_sensitive(key->key);
key->key = NULL;
if (key->tfm) {
crypto_free_sync_skcipher(key->tfm);

45
net/ceph/messenger_v2.c
View File

@ -689,11 +689,10 @@ static int verify_epilogue_crcs(struct ceph_connection *con, u32 front_crc,
}
static int setup_crypto(struct ceph_connection *con,
u8 *session_key, int session_key_len,
u8 *con_secret, int con_secret_len)
const u8 *session_key, int session_key_len,
const u8 *con_secret, int con_secret_len)
{
unsigned int noio_flag;
void *p;
int ret;
dout("%s con %p con_mode %d session_key_len %d con_secret_len %d\n",
@ -751,15 +750,14 @@ static int setup_crypto(struct ceph_connection *con,
return ret;
}
p = con_secret;
WARN_ON((unsigned long)p & crypto_aead_alignmask(con->v2.gcm_tfm));
ret = crypto_aead_setkey(con->v2.gcm_tfm, p, CEPH_GCM_KEY_LEN);
WARN_ON((unsigned long)con_secret &
crypto_aead_alignmask(con->v2.gcm_tfm));
ret = crypto_aead_setkey(con->v2.gcm_tfm, con_secret, CEPH_GCM_KEY_LEN);
if (ret) {
pr_err("failed to set gcm key: %d\n", ret);
return ret;
}
p += CEPH_GCM_KEY_LEN;
WARN_ON(crypto_aead_ivsize(con->v2.gcm_tfm) != CEPH_GCM_IV_LEN);
ret = crypto_aead_setauthsize(con->v2.gcm_tfm, CEPH_GCM_TAG_LEN);
if (ret) {
@ -777,8 +775,11 @@ static int setup_crypto(struct ceph_connection *con,
aead_request_set_callback(con->v2.gcm_req, CRYPTO_TFM_REQ_MAY_BACKLOG,
crypto_req_done, &con->v2.gcm_wait);
memcpy(&con->v2.in_gcm_nonce, p, CEPH_GCM_IV_LEN);
memcpy(&con->v2.out_gcm_nonce, p + CEPH_GCM_IV_LEN, CEPH_GCM_IV_LEN);
memcpy(&con->v2.in_gcm_nonce, con_secret + CEPH_GCM_KEY_LEN,
CEPH_GCM_IV_LEN);
memcpy(&con->v2.out_gcm_nonce,
con_secret + CEPH_GCM_KEY_LEN + CEPH_GCM_IV_LEN,
CEPH_GCM_IV_LEN);
return 0; /* auth_x, secure mode */
}
@ -800,7 +801,7 @@ static int hmac_sha256(struct ceph_connection *con, const struct kvec *kvecs,
desc->tfm = con->v2.hmac_tfm;
ret = crypto_shash_init(desc);
if (ret)
return ret;
goto out;
for (i = 0; i < kvec_cnt; i++) {
WARN_ON((unsigned long)kvecs[i].iov_base &
@ -808,15 +809,14 @@ static int hmac_sha256(struct ceph_connection *con, const struct kvec *kvecs,
ret = crypto_shash_update(desc, kvecs[i].iov_base,
kvecs[i].iov_len);
if (ret)
return ret;
goto out;
}
ret = crypto_shash_final(desc, hmac);
if (ret)
return ret;
out:
shash_desc_zero(desc);
return 0; /* auth_x, both plain and secure modes */
return ret; /* auth_x, both plain and secure modes */
}
static void gcm_inc_nonce(struct ceph_gcm_nonce *nonce)
@ -2072,27 +2072,32 @@ static int process_auth_done(struct ceph_connection *con, void *p, void *end)
if (con->state != CEPH_CON_S_V2_AUTH) {
dout("%s con %p state changed to %d\n", __func__, con,
con->state);
return -EAGAIN;
ret = -EAGAIN;
goto out;
}
dout("%s con %p handle_auth_done ret %d\n", __func__, con, ret);
if (ret)
return ret;
goto out;
ret = setup_crypto(con, session_key, session_key_len, con_secret,
con_secret_len);
if (ret)
return ret;
goto out;
reset_out_kvecs(con);
ret = prepare_auth_signature(con);
if (ret) {
pr_err("prepare_auth_signature failed: %d\n", ret);
return ret;
goto out;
}
con->state = CEPH_CON_S_V2_AUTH_SIGNATURE;
return 0;
out:
memzero_explicit(session_key_buf, sizeof(session_key_buf));
memzero_explicit(con_secret_buf, sizeof(con_secret_buf));
return ret;
bad:
pr_err("failed to decode auth_done\n");
@ -3436,6 +3441,8 @@ void ceph_con_v2_reset_protocol(struct ceph_connection *con)
}
con->v2.con_mode = CEPH_CON_MODE_UNKNOWN;
memzero_explicit(&con->v2.in_gcm_nonce, CEPH_GCM_IV_LEN);
memzero_explicit(&con->v2.out_gcm_nonce, CEPH_GCM_IV_LEN);
if (con->v2.hmac_tfm) {
crypto_free_shash(con->v2.hmac_tfm);